Apparatus for evaluating battery cell

Abstract

The present invention relates to an apparatus for evaluating a battery cell and, more specifically, to an apparatus for evaluating a battery cell, comprising: a housing having a space part; a holder part composed of a first connection member and a second connection member that are accommodated in the space part so as to fix the electrode lead of the battery cell; and a jig including a first elevation adjustment member for adjusting the height of the second connection member, wherein the first elevation adjustment member has a function by which the force pressed by the second connection member can be measured when the second connection member is in close contact with the first connection member or the electrode lead.

Description

Battery cell evaluation device

[0001] This application claims the benefit of priority to Korean Patent Application No. 2023-0129864, filed September 26, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an evaluation device for a battery cell, and more specifically, to an evaluation device for a battery cell having a structure capable of increasing the reliability of an evaluation result.

[0003]

[0004] As technological development and demand for mobile devices increase, rechargeable secondary batteries are increasingly being used as energy sources for a variety of mobile devices. Secondary batteries are also attracting attention as an energy source for electric and hybrid electric vehicles, offering an alternative to conventional gasoline and diesel vehicles that rely on fossil fuels.

[0005] Secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0006] Meanwhile, lithium-ion batteries go through several processes, including aging, charge / discharge, OCV (Open Circuit Voltage) testing, and IR (Internal Resistance) testing, before being produced and shipped. Among these, the charge / discharge process is a process that repeats the process of charging and discharging the produced secondary battery, and is a very important process that determines the quality of the secondary battery.

[0007] At this time, in order to charge and discharge a secondary battery, an electrode lead or electrode tab and a charging and discharging jig for applying current are used, and the secondary battery is placed on the jig, and current is applied while the electrode lead or electrode tab of the secondary battery is in contact with the current terminal of the jig to charge and discharge the secondary battery.

[0008] In this regard, Fig. 1 is a cross-sectional view of a charge / discharge jig according to the prior art. As illustrated in Fig. 1, the jig (30) electrically connected to the battery cell comprises a lower member (31) for fixing the electrode lead (12) from the upper and lower surfaces, an upper member (32), and a screw (33) for lowering the upper member (32).

[0009] Meanwhile, since the resistance of a battery cell can vary depending on the adhesion between the electrode lead and the connecting member, it is necessary to always connect the electrode lead and the connecting member with a constant force. However, the jig illustrated in Fig. 1 only rotates the screw (33) to move the upper member (32), making it difficult to consistently control the force applied to the electrode lead by each worker or even by the same worker, which is pointed out as a cause of lowering the reliability of the battery cell evaluation results.

[0010] Furthermore, when connecting the electrode leads of a battery cell to a connecting member, it is desirable for the electrode leads to be secured to the jig in a horizontal position without bending. However, recent battery cells come in varying capacities, which in turn alters their overall size. Therefore, a jig that ensures the electrode leads are secured with minimal deformation is required.

[0011]

[0012] (Prior art literature)

[0013] (Patent Document 1) Korean Patent Publication No. 2022-0040647

[0014]

[0015] In order to solve the above problems, the present invention aims to provide an evaluation device for a battery cell having a jig having a function of controlling the pressing force of a connecting member connected to an electrode lead so as to increase the reliability of the evaluation result.

[0016] Another object of the present invention is to provide an evaluation device for a battery cell that can be connected to a jig while maintaining the electrode leads in a parallel state even when the volume of the battery cell changes.

[0017]

[0018] As a technical means for achieving the above object, the battery cell evaluation device according to the present invention comprises: a housing (110) having a space (S); a holder (120) composed of a first connecting member (121) and a second connecting member (122) that are accommodated in the space (S) and fix an electrode lead (12) of a battery cell (10); and a jig (100) including a first elevation adjustment member (130) that adjusts the height of the second connecting member (122); wherein the first elevation adjustment member (130) is characterized in that it is provided with a function capable of measuring a pressing force of the second connecting member (122) when the second connecting member (122) and the first connecting member (121), or the second connecting member (122) and the electrode lead (12) are in close contact.

[0019] In addition, in the battery cell evaluation device according to the present invention, the first lifting control member (130) is characterized in that it is a torque wrench.

[0020] In addition, in the battery cell evaluation device according to the present invention, the first lifting adjustment member (130) is characterized by including a screw-type first vertical member (131) that penetrates the housing (110) and has one end connected to the second adjustment member (122), a handle (132) that is positioned in a state exposed to the outside of the housing (110) and is connected to the other end of the first vertical member (131), and a pressure gauge (133) provided on the handle (132).

[0021] In addition, the battery cell evaluation device according to the present invention is characterized by further including a die portion on which the battery cell (10) or the jig (100) is mounted.

[0022] In addition, in the evaluation device of a battery cell according to the present invention, the die portion is characterized by including a main die portion (200) having a predetermined area; a first die portion (300) located above the main die portion (200) on which the battery cell (10) is mounted; and a second die portion (400) located above the main die portion (200) on which the jig (100) is mounted.

[0023] In addition, in the battery cell evaluation device according to the present invention, at least one of the first die portion (300) and the second die portion (400) is characterized in that the height is adjustable.

[0024] In addition, in the evaluation device of a battery cell according to the present invention, the first die portion (300) includes a first plate (310) having a predetermined area and having one or more second holes (311) formed on a side surface, one or more second vertical members (320) that vertically penetrate the first plate (310) and have one end fixed to the main die portion (200), and one or more first fixing members (330) that are fastened to the second holes (311) in a screw type, wherein the second vertical members (320) are exposed by the second holes (311), and the first fixing members (330) limit the vertical movement of the first plate (310).

[0025] In addition, in the battery cell evaluation device according to the present invention, the outer surface of the second vertical member (320) is characterized in that a scale is provided.

[0026] In addition, in the evaluation device of a battery cell according to the present invention, the second die portion (400) includes a second plate (410) having a predetermined area and having one or more third holes (411) formed on a side surface, one or more third vertical members (420) that vertically penetrate the second plate (410) and have one end fixed to the main die portion (200), and one or more second fixing members (430) that are fastened to the third hole (411) in a screw type, wherein the third vertical member (420) is exposed by the third hole (411), and the second fixing members (430) limit the vertical movement of the second plate (410).

[0027] In addition, in the battery cell evaluation device according to the present invention, a scale is provided on the outer surface of the third vertical member (420).

[0028] In addition, in the evaluation device of a battery cell according to the present invention, the second die portion (400) is characterized in that there are two of them and they are located on both sides of the first die portion (300).

[0029] In addition, in the battery cell evaluation device according to the present invention, the number of jigs (100) is two, and one is positioned in each of the second die sections (400).

[0030]

[0031] As described above, the battery cell evaluation device according to the present invention has the advantage of providing accurate measurement results of the battery cell, such as resistance values, because it uses a jig equipped with a function for checking the force applied to a connecting member that is in close contact with the electrode lead.

[0032] In addition, the battery cell evaluation device according to the present invention has a die section capable of adjusting the height of the battery cell and / or the jig, so that the electrode lead can always be connected to the jig in a parallel state regardless of changes in the volume of the battery cell.

[0033]

[0034] Figure 1 is a cross-sectional view of a charging / discharging jig according to the prior art.

[0035] Figure 2 is a perspective view of a battery cell evaluation device according to the present invention.

[0036] Figure 3 is a perspective view of a jig constituting a battery cell evaluation device according to the present invention.

[0037] Fig. 4 is a front view of the battery cell evaluation device illustrated in Fig. 2.

[0038] Figure 5 is a plan view of the battery cell evaluation device illustrated in Figure 2.

[0039]

[0040] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0041] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0042]

[0043] Hereinafter, a device for evaluating a battery cell according to the present invention will be described.

[0044] Fig. 2 is a perspective view of a battery cell evaluation device according to the present invention, and Fig. 3 is a perspective view of a jig constituting the battery cell evaluation device according to the present invention. In addition, Fig. 4 is a front view of the battery cell evaluation device illustrated in Fig. 2, and Fig. 5 is a plan view of the battery cell evaluation device illustrated in Fig. 2.

[0045] As shown in FIGS. 2 to 5, the battery cell evaluation device according to the present invention may be configured to include a jig (100) electrically connected to the battery cell (10), a main die section (200), a first die section (300), and a second die section (400).

[0046] First, the battery cell (10) is composed of a cell case (11) that accommodates an electrode assembly and a pair of electrode leads (12) that protrude and extend from both sides of the cell case (11), and three or four sides of the edge of the cell case (11) are sealed.

[0047] The cell case (11) can be formed using a laminate sheet composed of an outer covering layer, a metal layer, and an inner covering layer.

[0048] Since the inner covering layer is in direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and in order to seal it from the outside, the sealing area where the inner layers are thermally bonded must have excellent thermal bonding strength.

[0049] Materials for such inner covering layers may be selected from, but are not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and good sealing properties, polyurethane resins, and polyimide resins, and polypropylene, which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and excellent chemical resistance, is most preferable.

[0050] The metal layer in contact with the inner covering layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a preferred material for this metal layer is an aluminum film that is lightweight and has excellent formability.

[0051] And the other side of the metal layer is provided with an outer covering layer, and this outer covering layer can use a heat-resistant polymer with excellent tensile strength, moisture permeability, and air permeability to protect the electrode assembly while ensuring heat resistance and chemical resistance, and examples thereof include, but are not limited to, nylon or polyethylene terephthalate.

[0052] The electrode assembly may be formed of, but is not limited to, a jelly-roll type electrode assembly having a structure in which a separator is interposed between long sheet-shaped cathodes and anodes and then rolled up, a stack type electrode assembly having unit cells in which rectangular cathodes and anodes are stacked with a separator interposed between them, a stack-folding type electrode assembly in which the unit cells are rolled up by a long separator film, or a lamination-stack type electrode assembly in which the unit cells are stacked with a separator interposed between them and attached to each other.

[0053] The negative electrode is manufactured by applying a slurry containing a negative electrode active material and a binder to a negative electrode current collector.

[0054] The negative electrode current collector is typically made to have a thickness of 3 to 500 μm. There are no particular limitations on the negative electrode current collector as long as it is conductive and does not cause chemical changes in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel surface-treated with carbon, nickel, charcoal, silver, etc., aluminum-cadmium alloy, etc. can be used.

[0055] Examples of negative active materials include carbon such as non-graphitizable carbon and graphitic carbon; LixFe2O3(0≤x≤1), LixWO2(0≤x≤1), SnxMe1-xMe'yOz(Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, elements of group 1, 2, and 3 of the periodic table, halogen; 0 <x≤1; 1≤y≤3; 1≤z≤8) 등의 금속 복합 산화물; 리튬 금속; 리튬 합금; 규소계 합금; 주석계 합금; SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5 등의 금속 산화물; 폴리아세틸렌 등의 도전성 고분자; Li-Co-Ni계 재료; Si, SiO, SiO2 단독 또는 이들의 혼합물인 Si계 등을 사용할 수 있으나, 이들만으로 한정되는 것은 아니다.

[0056] Of course, a conductive material and a binder can be additionally mixed with the negative electrode active material and coated on the negative electrode current collector.

[0057] The positive electrode is manufactured by applying a slurry containing a positive electrode active material and a binder to the positive electrode current collector.

[0058] The positive electrode current collector can generally have a thickness of 3 to 500 μm. There are no particular limitations as long as it has high conductivity and does not cause chemical changes in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc. can be used. In addition, in order to increase the adhesive strength of the positive electrode active material, the surface can be formed with fine irregularities, or various shapes such as films, sheets, foils, nets, porous bodies, foams, and non-woven bodies are possible.

[0059] Examples of the cathode active material include layered compounds such as lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), and compounds substituted with one or more transition metals; lithium manganese oxides such as Li1+xMn2-xO4 (wherein, x is 0 to 0.33), LiMnO3, LiMn2O3, and LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, and Cu2V2O7; and Ni-site type lithium nickel oxides expressed by the chemical formula LiNi1-xMxO2 (wherein, M = Co, Mn, Al, Cu, Fe, Mg, B, or Ga, and x = 0.01 to 0.3). Lithium manganese composite oxides represented by the chemical formula LiMn2-xMxO2 (wherein, M = Co, Ni, Fe, Cr, Zn, or Ta, and x = 0.01 to 0.1) or Li2Mn3MO8 (wherein, M = Fe, Co, Ni, Cu, or Zn); LiMn2O4 in which a portion of Li in the chemical formula is replaced with an alkaline earth metal ion; disulfide compounds; Fe2(MoO4)3, etc., but are not limited thereto.

[0060] The positive electrode active material may be mixed with a conductive agent and a binder, and fillers may be added as needed.

[0061] The separator prevents shorting between the aforementioned negative electrode and positive electrode and only allows the movement of lithium ions. The material of the separator is preferably one selected from among polyethylene, polypropylene, polyethylene / polypropylene double layer, polyethylene / polypropylene / polyethylene triple layer, polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0062] Meanwhile, the negative current collector and the positive current collector are composed of a portion where a slurry mixed with an active material is applied and a non-coated portion where the slurry is not applied. The non-coated portion is formed by cutting or connecting a separate conductive member to the non-coated portion by ultrasonic welding, etc. to form an electrode tab, and these electrode tabs are gathered to form a tab bundle.

[0063] And a pair of electrode leads, each consisting of a positive lead and a negative lead, are electrically connected to a tab bundle of the aforementioned electrode assembly and then exposed to the outside of the cell case (11).

[0064]

[0065] To describe the jig (100) in detail, the jig (100) may be configured to include a housing (110) having a space (S), a holder (120) composed of a first connecting member (121) and a second connecting member (122) that are accommodated in the space (S) and fix an electrode lead (12) of a battery cell (10), and a first elevation adjustment member (130) that adjusts the height of the second connecting member (122).

[0066] The first connecting member (121) housed in the space (S) of the housing (110) is fixed to the housing (110), while the second connecting member (122) is connected to the first elevation control member (130) so as to be able to move up and down so as to be able to connect or disconnect the electrode lead (12) of the battery cell (10) to be measured.

[0067] In order to evaluate a battery cell, the electrode lead (12) must be electrically connected to a terminal (not shown) of a charging / discharging device via the first connecting member (121) and the second connecting member (122). Therefore, the first connecting member (121) and the second connecting member (122) may be made of a metal material, for example, bronze.

[0068] The first lifting control member (130) is configured to include a screw-type first vertical member (131) that penetrates the first hole (111) of the housing (110) and has one end connected to the second control member (122), a handle (132) that is positioned in a state exposed to the outside of the housing (110) and is connected to the other end of the first vertical member (131), and a pressure gauge (133) provided on the handle (132).

[0069] Therefore, when the handle (132) is held and rotated while the electrode lead (12) is positioned between the first connecting member (121) and the second connecting member (122), the second connecting member (122) is lowered and the electrode lead (12) is fixed.

[0070] When evaluating various performances of a battery cell, such as resistance, temperature, or electrolyte leakage, by connecting it to a charging / discharging device, the evaluation needs to be performed under the same conditions.

[0071] In particular, if the contact resistance occurring at the contact surface between the first connecting member and the second connecting member connected to the electrode lead is large, accurate evaluation cannot be performed because heat is generated at the contact area, so it is necessary to minimize the contact resistance.

[0072] The pressure gauge (133) provided on the handle (132) is a gauge that indicates the force applied to the second connecting member (122), that is, the pressure received by the electrode lead (12) if the electrode lead (12) is interposed between the first connecting member (121) and the second connecting member (122), or the pressure received by the second connecting member (122) if the electrode lead (12) is not interposed.

[0073] If the first lifting control member (130) has the function as described above, that is, it can press with a specific force and display the pressed force, there is no particular limitation, and for example, it can be a torque wrench. Since the function and measurement principle of a torque wrench correspond to a known technology, a detailed description thereof will be omitted.

[0074]

[0075] Next, the die parts will be described. The die part is where the battery cell (10) or the jig (100) mentioned above is mounted, and is composed of a main die part (200) having a roughly plate shape with a certain area and thickness, a first die part (300) located on the upper part of the main die part (200), and a second die part (400).

[0076] The first die section (300) is located in the center of the main die section (200) where the battery cell (10) is mounted, and the second die sections (400) are located on each side of the first die section (300) where the jig (100) is mounted.

[0077] Here, it is preferable that at least one of the first die section (300) and the second die section (400) is height-adjustable, and it is more preferable that both the first die section (300) and the second die section (400) are height-adjustable.

[0078] When connecting the electrode lead (12) of the battery cell (10) and the jig (100), the electrode lead (12) must be interposed between the first connecting member (121) and the second connecting member (122) of the jig (100) while maintaining a horizontal position without being bent.

[0079] However, the battery cell (10) has a variety of capacities, and accordingly, the thickness of the battery cell (10), or in other words, the thickness of the cell case (11), may vary. Therefore, regardless of the thickness of the cell case (11), it is preferable that the first die section (300) on which the battery cell (10) is mounted, and / or the second die section (400) on which the jig (100) is mounted, be structured to be able to move up and down so that the electrode lead (12) can be connected to the jig (100) while maintaining a horizontal position.

[0080] In detail, the first die section (300) may be configured to include a first plate (310) having a certain area and having one or more second holes (311) formed on a side surface, one or more second vertical members (320) that vertically penetrate the first plate (310) and have one end fixed to the main die section (200), and one or more first fixing members (330) that are fastened to the second holes (311) in a screw type.

[0081] Here, the second vertical member (320) is exposed by the second hole (311), and the up-and-down movement of the first plate (310) is restricted by the first fixed member (330).

[0082] As a result, the first plate (310) is structured to be able to slide up and down along the first fixing member (330) penetrating near each corner, and is also fixed at a specific position by the first fixing member (330).

[0083] Meanwhile, it is preferable that each of the outer surfaces of the second vertical member (320) consisting of four pieces be provided with a graduation mark, and it is easy to maintain the first plate (310) in an accurately horizontal state through these graduation marks.

[0084] Continuing, the second die (400) is positioned on each side of the first die (300), which is the edge of the main die (200), where the jig (100) is mounted.

[0085] The second die section (400) may be configured to include a second plate (410) having a certain area and having one or more third holes (411) formed on the side surface, one or more third vertical members (420) that vertically penetrate the second plate (410) and have one end fixed to the main die section (200), and one or more second fixing members (430) that are fastened to the third holes (411) in a screw type.

[0086] Here, the third vertical member (420) is exposed by the third hole (411), and the up-and-down movement of the second plate (410) is limited by the second fixed member (430).

[0087] As a result, the second plate (410) is structured to be able to slide up and down along the third vertical member (420) penetrating near each corner, and is also fixed at a specific position by the second fixing member (430).

[0088] Meanwhile, it is preferable that the outer surfaces of the third vertical member (420) positioned to penetrate the second plate (410) be provided with graduations, and it is easy to maintain the first plate (310) in an accurately horizontal state through these graduations.

[0089]

[0090] When evaluating a battery cell having the aforementioned configuration using an evaluation device, the negative and positive leads are fastened to each pair of jigs, ensuring that the pressure gauge readings on the first lifting control member always remain within the same range. It is also desirable to secure a pressure that minimizes contact resistance in advance.

[0091] Each of the other pair of jigs is connected to the charge / discharge terminals and then allows a charge / discharge device (not shown) to charge / discharge the battery cells.

[0092] Meanwhile, the charging / discharging device performs the function of driving charging / discharging of electrically connected battery cells, and includes a power supply unit, a load unit, and a switching circuit. The power supply unit adjusts voltage and / or current to charge the battery cells and applies the same to the battery cells, and the load unit discharges the energy stored in the battery cells. The power supply unit and the load unit can be selectively electrically connected to the battery cells by the switching circuit. Since this charging / discharging device corresponds to a known technology, further description will be omitted.

[0093] Of course, it is self-evident that during the charging and discharging process, the resistance, temperature, or electrolyte leakage of the battery cell can be monitored.

[0094]

[0095] As described above, specific parts of the present invention have been described in detail. To those skilled in the art, such specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present invention, and it is natural that such changes and modifications fall within the scope of the appended patent claims.

[0096] (Explanation of symbols)

[0097] 10: Battery cell

[0098] 11: Cell Case

[0099] 12: Electrode lead

[0100] 100: Jig

[0101] 110: Housing 111: First Hall

[0102] 120: Holder section

[0103] 121: First connecting member 122: Second connecting member

[0104] 130: First lifting control member

[0105] 131: First vertical member 132: Handle

[0106] 133: Gauge

[0107] 200: Main Daibu

[0108] 300: First Daibu

[0109] 310: First plate 311: Second hole

[0110] 320: Second vertical member

[0111] 330: First fixed member

[0112] 400: Second Daibu

[0113] 410: 2nd plate 411: 3rd hole

[0114] 420: Third vertical member

[0115] 430: Second fixed member

[0116] S: Space Department

Claims

1. Housing with space; A holder portion comprising a first connecting member and a second connecting member that are accommodated in the above space and fix the electrode lead of the battery cell; and A jig including a first lifting adjustment member for adjusting the height of the second connecting member; A battery cell evaluation device characterized in that the first lifting control member is provided with a function capable of measuring the pressing force exerted by the second connecting member when the second connecting member and the first connecting member, or the second connecting member and the electrode lead, are in close contact.

2. In paragraph 1, An evaluation device for a battery cell, characterized in that the first lifting control member is a torque wrench.

3. In paragraph 2, A battery cell evaluation device characterized in that the first lifting control member includes a screw-type first vertical member having one end connected to the second control member after penetrating the housing, a handle positioned in a state exposed to the outside of the housing and connected to the other end of the first vertical member, and a pressure gauge provided on the handle.

4. In paragraph 1, An evaluation device for a battery cell, characterized in that it further includes a die portion on which the battery cell or the jig is mounted.

5. In paragraph 4, The above die portion has a main die portion having a certain area; A first die portion located on the upper portion of the main die portion and on which the battery cell is mounted; and An evaluation device for a battery cell, characterized in that it includes a second die portion located on the upper part of the main die portion and on which the jig is mounted.

6. In paragraph 5, An evaluation device for a battery cell, characterized in that at least one of the first die section and the second die section is height-adjustable.

7. In paragraph 6, The first die section includes a first plate having a predetermined area and having one or more second holes on a side surface, one or more second vertical members vertically penetrating the first plate and having one end fixed to the main die section, and one or more first fixing members fastened to the second hole in a screw type manner. An evaluation device for a battery cell, characterized in that the second vertical member is exposed by the second hole, and the vertical movement of the first plate is limited by the first fixing member.

8. In paragraph 7, An evaluation device for a battery cell, characterized in that a scale is provided on the outer surface of the second vertical member.

9. In paragraph 6, The second die section includes a second plate having a predetermined area and having one or more third holes on a side surface, one or more third vertical members vertically penetrating the second plate and having one end fixed to the main die section, and one or more second fixing members fastened to the third hole in a screw type manner. An evaluation device for a battery cell, characterized in that the third vertical member is exposed by the third hole, and the vertical movement of the second plate is limited by the second fixing member.

10. In paragraph 9, An evaluation device for a battery cell, characterized in that the outer surface of the third vertical member is provided with a scale.

11. In paragraph 6, An evaluation device for a battery cell, characterized in that the second die portion is two in number and is located on each side of the first die portion.

12. In paragraph 11, An evaluation device for a battery cell, characterized in that the above jigs are two in number, and one is positioned in each of the second die sections.

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