Tray device

Abstract

The present invention relates to a tray device and, more particularly, to a tray device comprising: a device frame including a first frame, a second frame, and a support frame, wherein the first frame and the second frame are spaced apart from each other at a predetermined interval along a first direction (D1), and the support frame connects the first frame and the second frame; a pressing part disposed in the device frame and configured to press a battery cell, wherein the pressing part includes a driving unit, a pressing unit, and a cell support block, the driving unit being disposed on the first frame and connected to the pressing unit, the pressing unit being disposed inside the device frame and configured to press the battery cell, and the cell support block being configured to support a lower portion of the battery cell; and a height adjustment part disposed in the device frame and connected to the cell support block, wherein the height adjustment part may be configured to move the cell support block in a third direction (D3).

Description

Tray device

[0001] The present invention relates to a tray device, and more specifically, to a tray device capable of stably supporting a battery cell and applying a uniform pressure to the battery cell.

[0002]

[0003] With the rapid proliferation of battery-powered electronic devices such as mobile phones, laptop computers, and electric vehicles, the demand for high-energy-density, high-capacity rechargeable batteries is rapidly increasing. Accordingly, research and development to improve the performance of lithium-ion batteries is actively underway.

[0004] A lithium secondary battery is a battery comprising a positive electrode and a negative electrode containing an active material capable of lithium ion intercalation and deintercalation, and an electrolyte, which produces electrical energy through oxidation and reduction reactions when lithium ions are intercalated or deintercalated from the positive and negative electrodes.

[0005] Recently, in response to industrial demands, the development of batteries with high energy density and safety is actively underway. Recently, all-solid-state batteries, which replace liquid electrolytes with solid electrolytes, have been proposed. An all-solid-state battery is a battery formed by stacking a positive electrode, a solid electrolyte, and a negative electrode, and then densifying them under pressure; it utilizes a solid electrolyte instead of the liquid electrolyte found in conventional rechargeable batteries. By not using flammable organic dispersion media, all-solid-state batteries can significantly reduce the likelihood of fire or explosion in the event of a short circuit. Consequently, such all-solid-state batteries can possess high safety.

[0006] There are various design forms of secondary batteries, such as pouch type, prismatic type, and battery pack, and among these, for pouch-type secondary batteries, it may be important to apply uniform pressure.

[0007] When a uniform pressure is applied to a pouch-type lithium secondary battery, gas inside the pouch can be removed and the electrolyte can be spread evenly, thereby improving battery performance. When a uniform pressure is applied to a pouch-type all-solid-state battery, the interfacial contact between the positive electrode, the negative electrode, and the solid electrolyte can be increased, thereby improving battery performance.

[0008] In order to apply uniform pressure to a pouch-type secondary battery, the pouch-type secondary battery must be able to be stably secured.

[0009]

[0010] The problem that the present invention aims to solve is to provide a tray device that stably supports a battery cell and can apply a uniform pressure to the battery cell.

[0011]

[0012] A tray device according to the concept of the present invention comprises: a device frame including a first frame, a second frame, and a support frame; wherein the first frame and the second frame are spaced apart at a predetermined interval along a first direction (D1), and the support frame connects the first frame and the second frame; a pressurizing unit disposed on the device frame and configured to pressurize a battery cell, wherein the pressurizing unit includes a driving unit, a pressurizing unit, and a cell support block, wherein the driving unit is disposed on the first frame and connected to the pressurizing unit, wherein the pressurizing unit is disposed inside the device frame and configured to pressurize the battery cell, and wherein the cell support block is configured to support the lower part of the battery cell; and a height adjustment unit disposed on the device frame and connected to the cell support block; wherein the height adjustment unit may be configured to move the cell support block along a third direction (D3).

[0013]

[0014] The tray device according to the present invention can stably support a pouch-type secondary battery, thereby enabling a uniform pressure to be applied to the pouch-type secondary battery.

[0015] This can improve the performance of pouch-type secondary batteries.

[0016]

[0017] FIG. 1 is a cross-sectional view of an all-solid-state battery cell according to embodiments of the present invention.

[0018] FIG. 2a is a diagram showing the state of housing an all-solid-state battery cell according to embodiments of the present invention in a pouch.

[0019] FIG. 2b is a schematic cross-section of a pouch-type all-solid-state battery.

[0020] FIG. 3 is an upper perspective view illustrating a tray device according to embodiments of the present invention.

[0021] FIG. 4 is a lower perspective view illustrating a tray device according to embodiments of the present invention.

[0022] FIG. 5a is a plan view illustrating a tray device according to embodiments of the present invention.

[0023] FIG. 5b is an enlarged view of the dotted line portion disclosed in FIG. 5a.

[0024] FIG. 6 is a bottom view illustrating a tray device according to embodiments of the present invention.

[0025] FIG. 7 is a side view illustrating a tray device according to embodiments of the present invention.

[0026] FIG. 8 is a front view illustrating a tray device according to embodiments of the present invention.

[0027] FIG. 9 is a rear view illustrating a tray device according to embodiments of the present invention.

[0028] FIG. 10a is a cross-sectional view illustrating the AA' portion disclosed in FIG. 8.

[0029] FIG. 10b is an enlarged view showing the dotted line portion disclosed in FIG. 10a.

[0030] FIG. 11 is a cross-sectional view illustrating the BB' portion disclosed in FIG. 8.

[0031] FIG. 12 is a cross-sectional view illustrating the CC' portion disclosed in FIG. 8.

[0032] FIG. 13 is a cross-sectional view illustrating the DD' portion disclosed in FIG. 6.

[0033] FIG. 14a is a front view illustrating a cell support block according to embodiments of the present invention.

[0034] FIG. 14b is a plan view illustrating a cell support block according to embodiments of the present invention.

[0035] FIG. 14c is a side view illustrating a cell support block according to embodiments of the present invention.

[0036] FIG. 15a is a front view illustrating a cell support block and a first shape deformation part according to embodiments of the present invention.

[0037] FIG. 15b is a side view illustrating a cell support block and a first shape deformation part according to embodiments of the present invention.

[0038] FIG. 15c is a plan view illustrating a cell support block and a first shape deformation part according to embodiments of the present invention.

[0039] FIG. 15d is a cross-sectional view illustrating the EE' portion disclosed in FIG. 15a.

[0040] FIG. 15e is a drawing illustrating the operating state of the first shape deformation part disclosed in FIG. 15d.

[0041] FIG. 15f is a front view illustrating the operating state of the first shape deformation part disclosed in FIG. 15e.

[0042] FIG. 15g is a partial cross-sectional view illustrating the first main locking part and the first sub-locking part on the internal structure of the dotted line portion disclosed in FIG. 15f.

[0043] FIG. 15h is a drawing illustrating the structure of a first main locking part according to embodiments of the present invention.

[0044] FIG. 15i is a drawing illustrating a state in which a first shape deformation part according to embodiments of the present invention supports the lower part of a battery cell.

[0045] FIG. 16a is a front view illustrating a cell support block and first and second shape deformation parts according to embodiments of the present invention.

[0046] FIG. 16b is a side view illustrating a cell support block and first and second shape deformation parts according to embodiments of the present invention.

[0047] FIG. 16c is a plan view illustrating a cell support block and a second shape deformation part according to embodiments of the present invention.

[0048] FIG. 16d is a cross-sectional view illustrating the FF' portion disclosed in FIG. 16a.

[0049] FIG. 16e is a drawing illustrating the operating state of the second shape deformation part disclosed in FIG. 16d.

[0050] FIG. 16f is a front view illustrating the operating state of the second shape deformation part disclosed in FIG. 16e.

[0051] FIG. 16g is a partial cross-sectional view illustrating the second main locking part and the second sub-locking part on the internal structure of the dotted line portion disclosed in FIG. 16f.

[0052] FIG. 16h is a drawing illustrating the structure of a second main locking part according to embodiments of the present invention.

[0053] FIG. 16i is a drawing illustrating a state in which a second shape deformation part according to embodiments of the present invention supports the lower part of a battery cell.

[0054]

[0055] In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention are described with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and various modifications can be made. The description of these embodiments is provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention.

[0056] In this specification, when a component is described as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed between them. Additionally, in the drawings, the thicknesses of the components are exaggerated for the effective description of the technical content. Throughout the specification, parts indicated by the same reference numeral represent the same components.

[0057] The embodiments described herein will be described with reference to cross-sectional and / or plan views, which are exemplary illustrations of the invention. In the drawings, the thicknesses of films and regions are exaggerated for effective description of the technical content. Accordingly, the regions illustrated in the drawings are schematic in nature, and the shapes of the regions illustrated in the drawings are intended to illustrate specific forms of regions of the device and are not intended to limit the scope of the invention. Although terms such as first, second, third, etc., have been used to describe various components in the various embodiments of this specification, these components should not be limited by such terms. These terms are used merely to distinguish one component from another. The embodiments described and illustrated herein also include their complementary embodiments.

[0058] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components to the mentioned components.

[0059]

[0060] FIG. 1 discloses a unit cell shape of an all-solid-state battery cell (10) according to embodiments of the present invention.

[0061] Referring to FIG. 1, the all-solid-state battery cell (10) may include a positive electrode layer (20), a negative electrode layer (30) facing the positive electrode layer (20), and a solid electrolyte layer (40) disposed between the positive electrode layer (20) and the negative electrode layer (30). However, not limited thereto, the all-solid-state battery cell (10) may further include an additional functional layer, such as an adhesion enhancing layer, disposed between the positive electrode layer (20) and the solid electrolyte layer (40) or between the negative electrode layer (30) and the solid electrolyte layer (40).

[0062] The positive layer (20) may include a positive current collector (21) and a positive active material layer (23) disposed on the positive current collector (21). The positive active material layer (23) may include a positive active material, a solid electrolyte, a conductive material, and a binder.

[0063] The positive current collector (21) can provide a reference surface on which the positive active material layer (23) is placed. The positive current collector (21) may have a plate or foil form. For example, the positive current collector (21) may include indium (In), copper (Cu), magnesium (Mg), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), aluminum (Al), germanium (Ge), lithium (Li), or an alloy thereof.

[0064] Unlike as illustrated in FIG. 1, in one embodiment of the present invention, the positive current collector (21) may be omitted. Although not illustrated, a carbon layer with a thickness of 0.1 μm to 4 μm may be further disposed between the positive current collector (21) and the positive active material layer (23) to increase the bonding strength between the positive current collector (21) and the positive active material layer (23).

[0065] The positive electrode active material may be a material capable of reversibly absorbing and desorbing lithium ions. For example, the positive electrode active material may include lithium transition metal oxides such as lithium cobalt oxide (LCO), lithium nickel oxide, lithium nickel cobalt oxide, lithium nickel cobalt aluminum oxide (NCA), lithium nickel cobalt manganese oxide (NCM), lithium manganate, and lithium iron phosphate, nickel sulfide, copper sulfide, lithium sulfide, iron oxide, or vanadium oxide, but is not limited thereto. The positive electrode active material may be a single material or a mixture of two or more materials.

[0066] Lithium transition metal oxides are, for example, Li a A 1-b B b D2(0.90≤a≤1, 0≤b≤0.5), Li a E 1-b B b O 2-c D c (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05), LiE 2-b B b O 4-c D c (0≤b≤0.5, 0≤c≤0.05), Li a Ni 1-b-c Co b B c D α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li aNor 1-b-c Co b B c O 2-α F α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Nor 1-b-c Mn b B c D α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2), Li a Nor 1-b-c Mn b B c O 2-α F α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Nor b E c G d O2(0.90≤a≤1, 0≤b≤0.9, 0≤c≤0.5, 0.001≤d≤0.1), Li a Nor b Co c Mn d GeO2(0.90≤a≤1, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0.001≤e≤0.1), Li a NiG b O2(0.9≤a≤1, 0.001≤b≤0.1), Li a CoG b O2(0.90≤a≤1, 0.001≤b≤0.1), Li a MnG b O2(0.90≤a≤1, 0.001≤b≤0.1), Li a Mn2GbO4(0.90≤a≤1, 0.001≤b≤0.1), QO2, QS2, LiQS2, V2O5, LiV2O5, LiIO2, LiNiVO4, Li 3-f J2(PO4)3(0≤f≤2), Li 3-fIt may be a compound represented by any one of Fe2(PO4)3 (0≤f≤2) or LiFePO4. In such a compound, the uppercase “A” is Ni, Co, Mn, or a combination thereof; the uppercase “B” is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; the uppercase “D” is O, F, S, P, or a combination thereof; the uppercase “E” is Co, Mn, or a combination thereof; the uppercase “F” is F, S, P, or a combination thereof; the uppercase “G” is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; the uppercase “Q” is Ti, Mo, Mn, or a combination thereof; the uppercase “I” is Cr, V, Fe, Sc, Y, or a combination thereof; and the uppercase “J” is V, Cr, Mn, Co, Ni, Cu, or a combination thereof.

[0067] The positive electrode active material may include, for example, a lithium salt of a transition metal oxide having a layered rock salt type structure among the lithium transition metal oxides described above. The "layered rock salt type structure" is, for example, a cubic rock salt type structure. <111> It is a structure in which oxygen and metal atomic layers are alternately and regularly arranged in a specific direction, thereby forming a two-dimensional plane for each atomic layer. The "cubic rock salt type structure" represents a sodium chloride (NaCl) type structure, which is a type of crystal structure; specifically, it exhibits a structure in which face-centered cubic lattices (fcc) formed by cations and anions, respectively, are offset from each other by half the ridge of the unit lattice. Lithium transition metal oxides having such a layered rock salt type structure are, for example, LiNi x Co y Al z O2(NCA) or LiNi x Co y Mnz O2(NCM) (0 <x<1,0<y<1, 0<z<1, x+y+z=1) 등의 삼원계 리튬전이금속산화물일 수 있다. 양극 활물질이 층상암염형 구조를 갖는 삼원계 리튬전이금속산화물을 포함하는 경우, 전고체 전지 셀(10)의 에너지 밀도가 커지고 열안정성이 향상될 수 있다.

[0068] The aforementioned compound contained in the positive electrode active material may be covered by a coating layer (not shown). The positive electrode active material may also be a mixture of the aforementioned compound and the compound to which the coating layer is added. Meanwhile, the coating layer added to the surface of the positive electrode active material may include, for example, oxides, hydroxides, oxyhydroxides, oxycarbonates, or hydroxycarbonates of the following coating elements. The compounds forming this coating layer may be amorphous or crystalline. The coating elements included in the coating layer may include Mg, Al, Co, K, Na, Ca, Si, Ti, V, Sn, Ge, Ga, B, As, Zr, or mixtures thereof. The coating layer may include, for example, Li2O-ZrO2 (LZO). The method for forming the coating layer may be selected within a range that does not adversely affect the physical properties of the positive electrode active material. The method for forming the coating layer may include, for example, spray coating or immersion methods.

[0069] When the positive active material is a ternary lithium transition metal oxide such as NCA or NCM and contains nickel (Ni), the capacity density of the all-solid-state battery cell (10) can be increased, and the metal leaching of the positive active material in the charged state can be reduced. As a result, the cycle characteristics of the all-solid-state battery cell (10) in the charged state can be improved. Meanwhile, “cycle characteristics” is a characteristic that indicates the degree of deterioration of the all-solid-state battery cell (10) due to charging and discharging of the all-solid-state battery cell (10). An all-solid-state battery cell (10) with high cycle characteristics has a small degree of deterioration due to charging and discharging, while an all-solid-state battery cell (10) with low cycle characteristics may have a large degree of deterioration due to charging and discharging.

[0070] The shape of the positive electrode active material may include particle shapes such as spheres or ellipsoids. The particle size and content of the positive electrode active material are not particularly limited.

[0071] The solid electrolyte may include a sulfide-based solid electrolyte with excellent lithium ion conductivity characteristics. Sulfide-based solid electrolytes include, for example, Li2S-P2S5, Li2S-P2S5-LiX (where X is a halogen element), Li2S-P2S5-Li2O, Li2S-P2S5-Li2O-LiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, and Li2S-P2S5-Z m S n (m, n are positive numbers, uppercase “Z” is one of Ge, Zn, or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li p MO q (p, q are positive numbers, uppercase “M” is one of P, Si, Ge, B, Al, Ga, In), Li 7-x PS 6-x Clx (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may include at least one selected from (0≤x≤2).

[0072] Sulfide-based solid electrolytes are, for example, Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may be an argyrodite-type compound comprising one or more selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound comprising one or more selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I. The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. By having a density of 1.5 g / cc or higher for the argyrodite-type solid electrolyte, the internal resistance of the all-solid-state battery is reduced, and defects such as penetration and short circuit of the solid electrolyte film due to lithium dendrite formation can be prevented. The elastic modulus of the solid electrolyte may be, for example, 15 GPa to 35 GPa.

[0073] The solid electrolyte included in the positive electrode active material layer (23) may have a smaller average particle size (D50) of intermediate particle size compared to the solid electrolyte included in the solid electrolyte layer (40). For example, the average particle size (D50) of the solid electrolyte included in the positive electrode active material layer (23) may be 90% or less, 80% or less, 70% or less, 60% or less, 50% or less, 40% or less, 30% or less, or 20% or less of the average particle size (D50) of the solid electrolyte included in the solid electrolyte layer (40). Meanwhile, the average particle size (D50) may be a median diameter measured using a laser particle size distribution meter.

[0074] The positive active material layer (23) may include a conductive material. The conductive material may have conductivity without causing chemical changes in the all-solid-state battery cell (10), thereby increasing the conductivity of the positive active material and the solid electrolyte. The conductive material may include a carbon-based material. The conductive material may include, for example, one or more selected from graphite, carbon black, acetylene black, carbon nanofibers, and carbon nanotubes.

[0075] The positive active material layer (23) may further include a binder. The binder may include a material for bonding the positive active material, solid electrolyte, and conductive material contained in the positive active material layer (23), and for improving the bonding strength with the positive current collector (21). For example, the binder may include polyvinylidene fluoride, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, vinylidene fluoride / hexafluoropropylene copolymer, polyacrylonitrile, or polymethyl methacrylate.

[0076] When the total of the positive active material, solid electrolyte, conductive material, and binder is 100 parts by weight, the positive active material layer (23) may include 85 to 92 parts by weight of the positive active material. The positive active material layer (23) may include 0.5 to 1.5 parts by weight of the binder.

[0077] In the positive active material layer (23), the conductive material may have 1 to 50 parts by weight per 100 parts by weight of solid electrolyte. If the conductive material is less than 1 part by weight per 100 parts by weight of solid electrolyte, the electrical conductivity of the positive active material layer (23) may be reduced. If the conductive material is more than 50 parts by weight per 100 parts by weight of solid electrolyte, the ratio of the conductive material is excessively high, so a coating layer covering the surface of the solid electrolyte may not be properly formed.

[0078] According to the embodiments, the positive active material layer (23) may further include at least one additive selected from the group consisting of a filler, a coating agent, a dispersant, and an ion-conducting aid, in addition to the positive active material, solid electrolyte, conductive material, and binder described above.

[0079] The solid electrolyte layer (40) is disposed between the positive electrode layer (20) and the negative electrode layer (30) and may include a sulfide-based solid electrolyte with excellent lithium ion conductivity characteristics. The solid electrolyte included in the solid electrolyte layer (40) may be the same as or different from any one of the materials that may be included in the solid electrolyte included in the aforementioned positive electrode active material layer (23).

[0080] The solid electrolyte layer (40) of one embodiment may include a sulfide-based solid electrolyte. The sulfide-based solid electrolyte may be manufactured by processing starting materials, such as Li2S or P2S5, by a melt quenching method or a mechanical milling method. Additionally, heat treatment may be performed after such processing. The solid electrolyte may be amorphous, crystalline, or a mixture thereof. Furthermore, the solid electrolyte may include sulfur (S), phosphorus (P), and lithium (Li) as at least constituent elements among the sulfide-based solid electrolyte materials described above, for example. For example, the solid electrolyte may be a material containing Li2S-P2S5. When using a sulfide-based solid electrolyte material containing Li2S-P2S5 to form the solid electrolyte, the molar ratio of Li2S and P2S5 is, for example, in the range of Li2S : P2S5 = 50 : 50 to 90 : 10.

[0081] Sulfide-based solid electrolytes are, for example, Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I xIt may be an argyrodite-type compound comprising one or more selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound comprising one or more selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I. The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. By having a density of 1.5 g / cc or higher for the argyrodite-type solid electrolyte, the internal resistance of the all-solid-state battery is reduced, and defects such as penetration and short circuits of the solid electrolyte film due to lithium dendrite formation can be prevented. The elastic modulus of the solid electrolyte is, for example, 15 GPa to 35 GPa.

[0082] The solid electrolyte layer (40) may further include a binder. The binder in the solid electrolyte layer (40) is not limited to, for example, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, etc. The binder of the solid electrolyte layer (40) may be the same as or different from the binder included in the positive active material layer (23) or the binder included in the coating layer (33).

[0083] The negative electrode layer (30) may include a negative electrode current collector (31) and a coating layer (33) on the negative electrode current collector (31). The negative electrode current collector (31) may provide a reference surface on which the coating layer (33) is placed. The negative electrode current collector (31) may include, for example, a material that does not react with lithium, that is, does not form any alloys or compounds with lithium. For example, the negative electrode current collector (31) may include at least one metal selected from the group consisting of copper (Cu), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), and nickel (Ni). The thickness of the negative electrode current collector (31) may be 1 μm to 20 μm, more specifically 5 μm to 15 μm, and more specifically 7 μm to 10 μm.

[0084] The negative current collector (31) may be composed of one of the metals described above, or may include an alloy of two or more metals or a coating material. The negative current collector (31) may, for example, have a plate-like or foil-like shape. Meanwhile, in one embodiment, the negative current collector (31) may be omitted.

[0085] The coating layer (33) can allow lithium metal to grow between the all-solid-state battery cell (10) and the negative current collector (31) during charging. The coating layer (33) can serve as a protective layer for the lithium metal and simultaneously suppress the precipitation and growth of lithium dendrites.

[0086] The coating layer (33) may include metal and carbon. For example, the coating layer (33) may include at least one metal selected from the group consisting of gold (Au), platinum (Pt), palladium (Pd), silicon (Si), silver (Ag), aluminum (Al), bismuth (Bi), tin (Sn), and zinc (Zn). The coating layer (33) may include at least one carbon selected from the group consisting of carbon black, acetylene black, furnace black, ketjen black, and graphene. In one embodiment, the coating layer (33) may include a mixture of carbon black and silver (Ag).

[0087] The coating layer (33) may further include other additives in addition to metal and carbon. The coating layer (33) may further include at least one additive selected from the group consisting of, for example, binders, fillers, coating agents, dispersants, and ion-conducting aids.

[0088] The coating layer (33) may have a smaller thickness compared to the positive active material layer (23). The thickness of the coating layer (33) may be, for example, 50% or less, 40% or less, 30% or less, 20% or less, 10% or less, or 5% or less of the thickness of the positive active material layer (23). The thickness of the coating layer (33) may be, for example, 1 µm to 20 µm, 2 µm to 10 µm, or 3 µm to 7 µm. If the thickness of the coating layer (33) is excessively thin, lithium dendrites formed between the coating layer (33) and the negative current collector (31) may cause the coating layer (33) to collapse, thereby degrading the cycle characteristics of the all-solid-state battery cell (10). If the thickness of the coating layer (33) increases excessively, the energy density of the all-solid-state battery cell (10) decreases, and the internal resistance of the all-solid-state battery cell (10) due to the coating layer (33) increases, which may degrade the cycle characteristics of the all-solid-state battery cell (10).

[0089] Meanwhile, although not shown, a carbon layer may be further included to improve adhesion between the coating layer (33) and the solid electrolyte layer (40).

[0090]

[0091] FIG. 2a is a diagram showing the state of housing an all-solid-state battery cell according to embodiments of the present invention in a pouch. FIG. 2b is a diagram schematically illustrating a cross-section of a pouch-type all-solid-state battery.

[0092] Referring to FIGS. 2a and 2b, the all-solid-state battery (ASB) may refer to a form in which an all-solid-state battery cell (10) is received in a cell receiving groove (PH) of a pouch (PCH) and packaged. More specifically, it may refer to an electrode assembly in which at least one unit cell is stacked and packaged in a pouch (PCH).

[0093] In this specification, the term "unit cell" may refer to a basic unit comprising components that constitute a cell. For example, a unit cell may include a first electrode, a second electrode having opposite polarity to the first electrode, and a solid electrolyte layer between the first and second electrodes. The first electrode may include a first electrode current collector (PLT1) and a first electrode coating layer and / or a first electrode active material layer formed on the first electrode current collector (PLT1), and the second electrode may include a second electrode current collector (PLT2) and a second electrode coating layer and / or a second electrode active material layer formed on the second electrode current collector (PLT2).

[0094] In one embodiment, the unit cell may include an anode layer (20), a cathode layer (30), and a solid electrolyte layer (40) between the anode layer (20) and the cathode layer (30). Here, the anode layer (20), the cathode layer (30), and the solid electrolyte layer (40) may be identical to the configuration of the all-solid-state battery cell (10) described in FIG. 1. Also, in one embodiment, the first electrode current collector (PLT1) may be the anode layer (20) and the second electrode current collector (PLT2) may be the cathode layer (30), or they may be opposite to each other.

[0095] The electrode assembly may include a unit cell, a substrate tab (TB) electrically connected to the unit cell, and a lead tab (LTB) connected to the substrate tab (TB). In one embodiment, the substrate tab (TB) may be electrically connected to an electrode current collector and may protrude from the electrode current collector. For example, a first substrate tab (TB1) may be electrically connected to a first electrode current collector (PLT1), and a second substrate tab (TB2) may be electrically connected to a second electrode current collector (PLT2).

[0096] The lead tab (LTB) can be electrically connected to the substrate tab (TB) and protrude outside the pouch. In other words, the lead tab (LTB) can be configured so that the electrode assembly is electrically connected to the outside of the pouch. The method of electrical connection is not particularly limited, and methods such as welding, soldering, and brazing may be used.

[0097] Although all-solid-state batteries were described in FIGS. 1 to 2b, the tray device (100) according to the embodiments of the present invention can be applied not only to pouch-type all-solid-state batteries but also to pouch-type lithium secondary batteries.

[0098]

[0099] The first direction (D1) described below may be the longitudinal direction of the device frame (200), the pressurizing part (300), the height adjustment part (400), the first shape deformation part (500), the second shape deformation part (600), etc. The second direction (D2) may be the width direction of the device frame (200), the pressurizing part (300), the height adjustment part (400), the first shape deformation part (500), the second shape deformation part (600), etc. The third direction (D3) may be the vertical direction of the device frame (200), the pressurizing part (300), the height adjustment part (400), the first shape deformation part (500), the second shape deformation part (600), etc. In addition, the first to third directions may be defined in various directions as needed.

[0100]

[0101] Referring to FIGS. 3 to 13, a tray device (100) according to an embodiment of the present invention may include a device frame (200), a pressurizing part (300), and a height adjustment part (400).

[0102] The device frame (200) can form the overall shape of the tray device (100).

[0103] The device frame (200) may include a first frame (210), a second frame (220), and a support frame (230).

[0104] The first frame (210) may be in the shape of a plate. In an embodiment of the present invention, the first frame (210) may be in the shape of a square plate, but is not necessarily limited thereto.

[0105] The second frame (220) may be spaced apart from the first frame (210) at a predetermined distance along the first direction (D1). The second frame (220) may be in the shape of a plate with the same or similar size as the first frame (210). In an embodiment of the present invention, the second frame (220) may be in the shape of a square plate, but is not necessarily limited thereto.

[0106] The support frame (230) can connect the first frame (210) and the second frame (220). The support frame (230) can be joined to the first frame (210) and the second frame (220) by fastening bolts (230a; see FIG. 8) to each. In an embodiment of the present invention, the support frame (230) may be in the shape of a square beam, but is not necessarily limited thereto.

[0107]

[0108] The pressurizing unit (300) can be placed on the device frame (200) and can pressurize the battery cell (EC).

[0109] The pressurizing unit (300) may include a pressurizing unit (320), a driving unit (310), and a cell support block (340).

[0110] The pressurizing unit (320) can be placed inside the device frame (200) and can pressurize the battery cell (EC).

[0111] The pressure unit (320) may include a first end plate (321), a second end plate (322), a pressure plate (323), a post support block (325a), a post (325), a link arm (326), a first upper end arm (326d), a first lower end arm (326e), a second upper end arm (326f), a second lower end arm (326g), a first stopper (327), a second stopper (328), and a cell guard part (330).

[0112] The first end plate (321) may be positioned adjacent to the first frame (210) inside the device frame (200). The first end plate (321) may be connected to a driving unit (310). The first end plate (321) may be in the shape of a plate. In an embodiment of the present invention, it may be in the shape of a square plate so as to stably pressurize a square battery cell (EC). However, it is not necessarily limited thereto.

[0113] The second end plate (322) may be positioned adjacent to the second frame (220) inside the device frame (200). The second end plate (322) may be positioned spaced apart from the first end plate (321) at a predetermined distance along the first direction (D1). The second end plate (322) may be in the shape of a plate. In an embodiment of the present invention, it may be in the shape of a square plate so as to stably pressurize a square battery cell (EC). However, it is not necessarily limited thereto.

[0114] The pressure plate (323) may include a plurality of pressure plates (323). The plurality of pressure plates (323) may be disposed between the first end plate (321) and the second end plate (322). A battery cell (EC) may be disposed between each of the plurality of pressure plates (323). The lower part of the battery cell (EC) may be supported by a cell support block (340). Additionally, a battery cell (EC) may be disposed between the first end plate (321) and the pressure plate (323), and between the second end plate (322) and the pressure plate (323). The pressure plate (323) may be in the shape of a plate. In an embodiment of the present invention, it may be in the shape of a square plate so as to stably press a square-shaped battery cell (EC). However, it is not necessarily limited thereto.

[0115] Referring to FIG. 3, the post support block (325a) may be placed at the corner of the first end plate (321), the corner of the second end plate (322), and the corner of the pressure plate (323), respectively. The post support block (325a) may be bolted and connected to the corner of the first end plate (321), the corner of the second end plate (322), and the corner of the pressure plate (323). A through hole into which a post (325) is inserted may be formed in the post support block (325a). The post support block (325a) may allow the first end plate (321), the second end plate (322), and the pressure plate (323) to move smoothly along the post (325). In an embodiment of the present invention, the post support block (325a) may be a bushing bearing, but is not necessarily limited thereto.

[0116] The post (325) can connect the first frame (210) and the second frame (220). The post (325) can be joined to the first frame (210) and the second frame (220) by fastening a bolt (325a; see FIG. 8) to each. In an embodiment of the present invention, the post (325) may be a cylindrical beam, but is not necessarily limited thereto.

[0117] The post (325) can be positioned to penetrate the post support block (325a). Accordingly, the first end plate (321), the second end plate (322), and the pressure plate (323) can be allowed to move smoothly along the longitudinal direction (D1) of the post (325). In other words, the post (325) can guide the first end plate (321), the second end plate (322), and the plurality of pressure plates (323) to move along the first direction (D1).

[0118]

[0119] Referring to FIG. 7, the link arm (326) can connect a plurality of pressure plates (323). A first link member (326b) can be coupled to one side of the link arm (326). The first link member (326b) can connect one side of the link arm (326) to one of the pressure plates (323a) of the plurality of pressure plates (323).

[0120] A link hole (326a) may be formed on the other side of the link arm (326). The link hole (326a) may be extended along the longitudinal direction of the link arm (326). A second link member (326c) may be inserted into the link hole (326a) and positioned on the other side of the link arm (326). The second link member (326c) may connect the other side of the link arm (326) to another pressure plate (323b) among the plurality of pressure plates (323).

[0121] When the gap between the plurality of pressure plates (323) is narrowed or widened by the driving unit (310), the second link member (326c) can move along the link hole (326a).

[0122] In an embodiment of the present invention, another pressure plate (323c) may be disposed between the one pressure plate (323a) and the other pressure plate (323b). In other words, the link arm (326) may connect the one pressure plate (323a) and the other pressure plate (323b) with the other pressure plate (323c) in between.

[0123] The first upper end arm (326d) can connect the first end plate (321) and the pressure plate (323). The first lower end arm (326e) can connect the first end plate (321) and the pressure plate (323). Based on the third direction (D3), the first upper end arm (326d) can be positioned on the upper side of the first lower end arm (326e).

[0124] In an embodiment of the present invention, the first lower end arm (326e) can connect the first end plate (321) and the pressure plate (323d) closest to the first end plate (321) among the plurality of pressure plates (323). The first upper end arm (326d) can connect the first end plate (321) and the pressure plate (323e) second closest to the first end plate (321) among the plurality of pressure plates (323).

[0125] In an embodiment of the present invention, the structure of the first upper end arm (326d) and the first lower end arm (326e) may be identical to the structure of the link arm (326). Accordingly, the first link member (326b) can connect the first upper end arm (326d) and the first lower end arm (326e) to the first end plate (321). The second link member (326c) can be inserted and positioned into the link holes (326a) formed in the first upper end arm (326d) and the first lower end arm (326e), respectively. The second link member (326c) can connect the first upper end arm (326d) and the first lower end arm (326e) to the pressure plate (323).

[0126] The second upper end arm (326f) can connect the second end plate (322) and the pressure plate (323). The second lower end arm (326g) can connect the second end plate (322) and the pressure plate (323). Based on the third direction (D3), the second upper end arm (326f) can be positioned on the upper side of the second lower end arm (326g).

[0127] In an embodiment of the present invention, the second lower end arm (326g) can connect the second end plate (322) and the pressure plate (323f) closest to the second end plate (322) among the plurality of pressure plates (323). The second upper end arm (326f) can connect the second end plate (322) and the pressure plate (323g) second closest to the second end plate (322) among the plurality of pressure plates (323).

[0128] In an embodiment of the present invention, the structure of the second upper end arm (326f) and the second lower end arm (326g) may be identical to the structure of the link arm (326). Accordingly, the first link member (326b) can connect the second upper end arm (326f) and the second lower end arm (326g) to the second end plate (322). The second link member (326c) can be inserted and positioned into the link holes (326a) formed in the second upper end arm (326f) and the second lower end arm (326g), respectively. The second link member (326c) can connect the second upper end arm (326f) and the second lower end arm (326g) to the pressure plate (323).

[0129]

[0130] Referring to FIG. 5a and FIG. 11, the first stopper (327) may be disposed on the surface facing the second end plate (322) on the second frame (220). The first stopper (327) may include a stopper block (327c), a stopper fastening part (327b), and a stopper head part (327a). The stopper block (327c) may be bolted and coupled to the surface facing the second end plate (322) on the second frame (220). The stopper fastening part (327b) may be coupled to the stopper block (327c). Male screw threads may be formed on the outer surface of the stopper fastening part (327b), and female screw threads may be formed in the adjustment hole (327d) of the stopper block (327c). Accordingly, the adjustment hole (327d) of the stopper fastening part (327b) and the stopper block (327c) can be threaded together. The stopper head part (327a) can be connected to the stopper fastening part (327b). The stopper head part (327a) can protrude in the direction of the second stopper (328).

[0131] The second stopper (328) may be placed on the surface of the second end plate (322) facing the first stopper (327). The second stopper (328) may be bolted to the second end plate (322). In an embodiment of the present invention, the second stopper (328) may be in the shape of a square plate, but is not necessarily limited thereto.

[0132] When the driving unit (310) applies force to the first end plate (321), the first end plate (321) can move along the first direction (D1) toward the second frame (220). Accordingly, the first end plate (321), the pressure plate (323), and the second end plate (322) can move together toward the second frame (220). Subsequently, when the second stopper (328) comes into contact with the stopper head portion (327a), the movement of the second end plate (322) stops, and the first end plate (321) and the pressure plate (323) can stop moving together.

[0133] In an embodiment of the present invention, the position of the stopper head portion (327a) can be adjusted based on the first direction (D1) by adjusting the degree of screw thread fastening between the stopper fastening portion (327b) and the adjustment hole (327d) of the stopper block (327c). When the position of the stopper head portion (327a) is adjusted, the range of movement in which the second end plate (322) can move along the first direction (D1) can be adjusted.

[0134]

[0135] Referring to FIGS. 5a and 5b, the cell guard portion (330) may be positioned on the side of the pressure plate (323). The cell guard portion (330) may support the side of a battery cell (EC) positioned between a plurality of pressure plates (323).

[0136] The cell guard section (330) may include a cell guard body (334), a fastening hole (331), a fastening member (332), and a guard block (333).

[0137] The cell guard body (334) may be placed on the side of the pressure plate (323). The cell guard body may be in the shape of a thin plate. The cell guard body (334) may be seated on the top of the pressure plate (323).

[0138] The fastening hole (331) may be formed on the cell guard body (334). The fastening hole (331) may be extended and arranged along the second direction (D2).

[0139] The fastener (332) is inserted into the fastening hole (331) and can connect the side of the cell guard body (334) and the pressure plate (323).

[0140] The guard block (333) can be positioned on both sides of the cell guard body (334) so ​​as to protrude in a first direction (D1). The guard block (333) can support the side of the battery cell (EC).

[0141] The relative position between the fastening member (332) and the fastening hole (331) can be adjusted along the second direction (D2). Accordingly, the position of the guard block (333) can be changed along the second direction (D2). In other words, the position of the guard block (333) can be adjusted in correspondence with the length of the battery cell (EC) in the second direction (D2). This allows the guard block (333) to stably support the side of the battery cell (EC).

[0142]

[0143] Referring to FIG. 5a and FIG. 11, the driving unit (310) may be placed on the first frame (210) and connected to the first end plate (321) of the pressurizing unit (320). The driving unit (310) may apply force to the first end plate (321). The driving unit (310) may adjust the distance between the first end plate (321), the pressurizing plate (323), and the second end plate (322). Accordingly, the first end plate (321), the pressurizing plate (323), and the second end plate (322) may pressurize the battery cell (EC).

[0144] The drive unit (310) may include a shaft bracket (313), a drive shaft (311), a pressure block (316), a bearing unit (317), and a pressure flange (318).

[0145] The shaft bracket (313) can be positioned to penetrate the first frame (210). A hole penetrating along the first direction (D1) can be formed on the shaft bracket (313). A first screw portion (313a) can be formed on the inner surface of the penetrating hole.

[0146] The drive shaft (311) can be positioned through the through hole of the shaft bracket (313).

[0147] A clutch portion (312) may be formed at one end of the drive shaft (311). The clutch portion (312) may be connected to a driving device such as a motor. The driving device such as a motor can transmit rotational force to the drive shaft (311) through the clutch portion (312) to rotate the drive shaft (311). In an embodiment of the present invention, the clutch portion (312) may have a polygonal shape. A polygonal clutch portion (312) may be suitable for receiving rotational force. However, the clutch portion (312) is not necessarily limited to a polygonal shape.

[0148] The other end of the drive shaft (311) can be connected to the first end plate (321) by a pressure flange (318).

[0149] A second screw portion (311b) may be formed on a part of the outer surface of the drive shaft (311). The second screw portion (311b) of the drive shaft (311) may engage with the first screw portion (313a) of the pipe hole.

[0150] When the drive shaft (311) rotates, the second screw part (311b) rotates along the first screw part (313a) and can move the drive shaft (311) along the first direction (D1).

[0151] The pressure block (316) may be disposed on a portion of the outer surface of the drive shaft (311). The pressure block (316) may be disposed on the drive shaft (311) and protrude radially. In an embodiment of the present invention, the pressure block (316) may be in the shape of a disc, but is not necessarily limited thereto.

[0152] The pressure flange (318) can be fixed to the second end plate (322) by bolting it. In an embodiment of the present invention, the pressure flange (318) may be in the shape of a disc, but is not necessarily limited thereto.

[0153] A bearing unit (317) may be disposed between a pressure block (316) and a pressure flange (318). The bearing unit (317) may support an axial load of the pressure block (316). In an embodiment of the present invention, the bearing unit (317) may be a thrust bearing capable of supporting an axial load, but is not necessarily limited thereto.

[0154] When the drive shaft (311) moves toward the first end plate (321), the pressure block (316) can press the bearing unit (317). The bearing unit (317) can transmit the pressure to the pressure flange (318). Accordingly, the first end plate (321) can move toward the second plane. The bearing unit (317) can facilitate the rotation of the pressure block (316) and, at the same time, support the axial load of the pressure block (316) and transmit it to the pressure flange (318).

[0155]

[0156] Referring to FIGS. 4, FIGS. 6, and FIGS. 12 to 14c, the cell support block (340) can support the lower part of the battery cell (EC).

[0157] Referring to FIGS. 14a to 14c, the cell support block (340) may include an upper support block (341), a lower support block (342), and a bush block (343).

[0158] The lower support block (342) may be formed to protrude downward from the lower part of the upper support block (341). In an embodiment of the present invention, the lower support block (342) may have a cuboid shape, but is not necessarily limited thereto. The lower support block (342) may be connected to the height adjustment part (400) by a bush block (343).

[0159] The bush block (343) can be connected to the lower support block (342) by fastening it with a bolt (434b). The bush block (343) may include a bush hole (343a) that penetrates in a first direction (D1). Referring to FIG. 13, the height adjustment shaft (450) of the height adjustment part (400) can be positioned to penetrate the bush hole (343a).

[0160] The upper support block (341) may be placed on the upper part of the lower support block (342). The upper support block (341) may include a rib (341b) protruding upward. The lower part of the battery cell (EC) may be seated on the upper part of the rib (341b).

[0161] The upper support block (341) may include a pair of ribs (341b). The pair of ribs (341b) may be spaced apart at a predetermined interval along the first direction (D1). The lower part of the pressure plate (323) may be located between the pair of ribs (341b).

[0162]

[0163] Referring to FIGS. 4, 6, 10a, 10b, 12, and 13, the height adjustment unit (400) can be placed on the device frame (200) and connected to the cell support block (340). The height adjustment unit (400) can move the cell support block (340) along a third direction (D3). In other words, the height adjustment unit (400) can adjust the vertical position of the cell support block (340).

[0164] The height adjustment unit (400) may include a height adjustment hole (410), a height adjustment member (420), a height adjustment block (430), and a height adjustment shaft (450).

[0165] The height adjustment shaft (450) can be positioned along the first direction (D1) while penetrating the lower support block (342). In other words, the height adjustment shaft (450) can be positioned along the first direction (D1) while penetrating the bush hole (343a) of the bush block (343).

[0166] In an embodiment of the present invention, the height adjustment shaft (450) may be a cylindrical beam, but is not necessarily limited thereto.

[0167] The height adjustment block (430) can be connected to the end of the height adjustment shaft (450). Referring to FIG. 13, a pair of height adjustment blocks (430) can be placed at each end of the height adjustment shaft (450). The height adjustment shaft (450) can be connected to the height adjustment block (430) by fastening it with a bolt (450a).

[0168] The height adjustment shaft (450) may include a plurality of height adjustment shafts (450). The plurality of height adjustment shafts (450) may be spaced apart at a predetermined interval along the second direction (D2) and may be coupled to the height adjustment block (430).

[0169] Referring to FIG. 10b, a block hole (431) penetrating in a first direction (D1) may be formed on the height adjustment shaft (450). A second threaded portion (431a) may be formed on the inner surface of the block hole (431). The second threaded portion (431a) may be a female thread.

[0170] The height adjustment hole (327d) can be formed by penetrating through each of the first frame (210) and the second frame (220) along the first direction (D1). The height adjustment hole (327d) can be extended along the third direction (D3).

[0171] The height adjustment hole (410) may include a pressure surface portion (410a). The pressure surface portion (410a) may be formed along a third direction (D3) on the height adjustment hole (410).

[0172] The height adjustment member (420) may include a head portion (421) and a stem portion (422). A first thread portion (422a) may be formed on the outer surface of the stem portion (422). The first thread portion (422a) may be a male thread. The stem portion (422) may be thread-fastened to the block hole (431). In other words, the first thread portion (422a) of the stem portion (422) and the second thread portion (431a) of the block hole (431) may interlock with each other.

[0173] The head portion (421) can be pressed and contacted on the pressure surface portion (410a). In other words, frictional resistance is generated between the head portion (421) and the pressure surface portion (410a), and the upper and lower positions of the height adjustment shaft (450) and the height adjustment block (430) can be fixed.

[0174] The upper and lower positions of the cell support block (340) can be adjusted to stably support the lower part of the battery cell (EC).

[0175] When adjusting the vertical position of the cell support block (340), the height adjustment member (420) can be rotated in one direction to release the stem portion (422) from the block hole (431). Accordingly, the head portion (421) can be kept out of contact with the pressure surface portion (410a). Since frictional resistance between the head portion (421) and the pressure surface portion (410a) is eliminated, the vertical position of the height adjustment member (420) can be adjusted as shown by the arrow (W1) inside the height adjustment hole (410). Accordingly, the vertical position of the height adjustment shaft (450) and the height adjustment block (430) can also be adjusted as shown by the arrow (W2).

[0176] After adjusting the vertical position of the height adjustment shaft (450) and the height adjustment block (430), the height adjustment member (420) can be rotated in the opposite direction so that the stem part (422) is tightened into the block hole (431). Accordingly, the head part (421) can strongly press against and come into contact with the pressure surface part (410a). In other words, high frictional resistance can be generated between the head part (421) and the pressure surface part (410a). The increased frictional resistance can fix the vertical position of the height adjustment member (420) on the height adjustment hole (410). Accordingly, the vertical position of the height adjustment shaft (450) and the height adjustment block (430) can be fixed.

[0177]

[0178] FIGS. 15a to 15i disclose a first shape deformation part (500) according to embodiments of the present invention.

[0179] Referring to FIGS. 15a through 15i, the first shape-deforming part (500) may be placed on the lower support block (342). The first shape-deforming part (500) may move the upper support block (341) along the third direction (D3). Specifically, an upwardly protruding rib (341b) may be placed on the upper support block (341). The first shape-deforming part (500) may adjust the upper and lower positions of the rib (341b) so that the rib (341b) stably supports the lower part of the battery cell (EC).

[0180] The first shape deformation part (500) may include a first gear block (511), a first gear shaft (512), a first link block (513), a first adjustment head (514), a first head shaft (514a), a first head block (515), a first through hole (516), a first receiving space (517), a first main locking part (520), and a first sub-locking part (530).

[0181] Referring to FIGS. 15d and 15f, the first link block (513) can be connected to the lower part of the upper support block (341). The first link block (513) can be extended and positioned along the longitudinal direction (D2) of the upper support block (341) from the lower part of the upper support block (341).

[0182] The first gear block (511) may be positioned at the bottom of the first link block (513). A plurality of gear teeth may be formed in the third direction (D3) on the first gear block (511). The first gear block (511) may be positioned extending along the longitudinal direction (D2) of the first link block (513) at the bottom of the first link block (513).

[0183] In an embodiment of the present invention, the first link block (513) and the first gear block (511) may generally have a rectangular shape, but are not necessarily limited thereto.

[0184] A plurality of gear teeth may be formed on the outer surface of the first gear shaft (512). The plurality of gear teeth of the first gear shaft (512) and the plurality of gear teeth of the first gear block (511) may mesh with each other. The first gear shaft (512) may be extended and positioned in the second direction (D2).

[0185] The first receiving space (517) may be formed inside the lower support block (342). The first gear shaft (512) may be placed in the first receiving space (517).

[0186] The first head block (515) may be positioned on the side of the lower support block (342). A first through hole (516) may be formed inside the first head block (515) along the second direction (D2).

[0187] The first adjustment head (514) may be positioned on the side of the lower support block (342). The first adjustment head (514) may include a first head shaft (514a). The first head shaft (514a) is inserted into the first through hole (516) and may be connected to the end of the first gear shaft (512).

[0188] According to the above structure, when the first adjustment head (514) is turned, the first gear shaft (512) can rotate. When the first gear shaft (512) rotates, the first gear block (511) can move along the third direction (D3). Accordingly, the upper and lower positions of the upper support block (341) can be adjusted.

[0189] Referring to FIGS. 15d and FIGS. 15e, it can be seen that the upper and lower positions of the upper support block (341) change as the first adjustment head (514) is rotated.

[0190]

[0191] Referring to FIG. 15g and FIG. 15h, the first main locking part (520) can fix the rotational position of the first adjustment head (514).

[0192] The first main locking part (520) may include a first locking groove (521), a first elastic body groove (524), a first elastic body (523), and a first locking projection (522). The first locking groove (521) may be formed concavely inwardly on the first through hole (516). The first locking groove (521) may include a plurality of first locking grooves (521). A plurality of first locking grooves (521) may be arranged along the circumferential direction on the inner surface of the first through hole (516). The first elastic body groove (524) may be formed concavely inwardly on the first head axis (514a).

[0193] The first elastic body (523) may be placed in the first elastic body groove (524). In an embodiment of the present invention, the first elastic body (523) may be a coil spring, but is not necessarily limited thereto.

[0194] The first locking projection (522) can be connected to the end of the first elastic body (523). The first locking projection (522) is inserted into the first locking groove (521) and can fix the rotational position of the first adjustment head (514).

[0195] The first adjustment head (514) can be manually rotated by an administrator using a wrench, power tool, etc. Alternatively, the administrator can use a controller to connect a separate automatic tool device to the first adjustment head (514), and the separate automatic tool device can rotate the first adjustment head (514).

[0196] When the first adjustment head (514) is rotated, the first locking projection (522) can move past one of the first locking grooves (521) to an adjacent first locking groove (521). Then, the rotational position of the first adjustment head (514) can be fixed at the position of the other first locking groove (521).

[0197] The first sub-locking part (530) may include a first sub-hole (533) and a first fixing member (531). The first sub-hole (533) may be formed in the first head block (515). The first sub-hole (533) penetrates the first head block (515) and may communicate with the outside through the first through hole (516). A female screw thread (533a) may be formed on the inner surface of the first sub-hole (533).

[0198] The first fixing member (531) can be inserted into the first subhole (533). A male thread portion (531a) may be formed on the outer surface of the first fixing member (531). The male thread portion (531a) of the first fixing member (531) and the female thread portion (533a) of the first subhole (533) may interlock with each other.

[0199] The end of the first fixing member (531) can press against and come into contact with the first head shaft (514a). In other words, frictional resistance occurs between the end of the first fixing member (531) and the first head shaft (514a), thereby preventing the first head shaft (514a) from rotating. Accordingly, since the first gear shaft (512) cannot rotate, the upper and lower positions of the upper support block (341) can be fixed.

[0200] When the first head shaft (514a) is to be rotated, the first fixing member (531) can be rotated in one direction so that the end of the first fixing member (531) does not come into contact with the first head shaft (514a). Accordingly, since frictional resistance between the end of the first fixing member (531) and the first head shaft (514a) is eliminated, the first adjustment head (514) can be rotated to rotate the first head shaft (514a) and the first gear shaft (512). Additionally, the upper and lower positions of the upper support block (341) can be adjusted.

[0201] After adjusting the upper and lower positions of the upper support block (341), the first fixing member (531) can be rotated in the opposite direction so that the end of the first fixing member (531) contacts the first head shaft (514a). Accordingly, the end of the first fixing member (531) can press against and contact the first head shaft (514a). Strong frictional resistance may occur between the end of the first fixing member (531) and the first head shaft (514a), and the first head shaft (514a) and the first gear shaft (512) cannot rotate. The upper and lower positions of the upper support block (341) can be fixed.

[0202] The first fixing member (531) can be manually rotated by an administrator using a wrench, power tool, etc. Alternatively, the administrator can use a controller to connect a separate automatic tooling device to the first fixing member (531), and the separate automatic tooling device can rotate the first fixing member (531).

[0203] In an embodiment of the present invention, the rotational position of the first adjustment head (514) can be fixed using the first main locking part (520) and the first sub-locking part (530). After adjusting the upper and lower positions of the upper support block (341) by rotating the first adjustment head (514), the first adjustment head (514) can be fixed again to fix the adjusted upper and lower positions of the upper support block (341).

[0204]

[0205] Referring to FIG. 15i, the outer portion (PCH1) of the pouch of the pouch-type battery cell (EC) may protrude significantly downward depending on the design specifications. In some cases, the outer portion (PCH1) of the pouch may come into contact with the height adjustment shaft (450).

[0206] For example, as disclosed in FIG. 15i, the length of the outer portion (PCH1) of the pouch can be defined as the first pouch length (H1). And the distance between the bottom portion of the battery cell (EC) and the height adjustment shaft (450) can be defined as the first distance (D1). If the first pouch length (H1) is greater than the first distance (D1), the outer portion (PCH1) of the pouch may come into contact with the height adjustment shaft (450). In this case, the outer portion (PCH1) of the pouch may bend or be crushed. This may reduce the uniform pressure performance when the pressure member (300) presses the battery cell (EC).

[0207] Therefore, it is necessary to adjust the height at which the upper support block (341) supports the battery cell (EC). The manager can manually rotate the first adjustment head (514) using a wrench, power tool, etc. Alternatively, the manager can use a controller to attach a separate automatic tool device to the first adjustment head (514), and the separate automatic tool device can rotate the first adjustment head (514).

[0208] Accordingly, the upper and lower positions of the upper support block (341) can be adjusted. In FIG. 15i, the upper support block (341) can move upward. The height at which the upper support block (341) supports the lower part of the battery cell (EC) can be increased.

[0209] The outer part of the pouch (PCH1) may not touch the height adjustment shaft (450).

[0210] In addition to the example described above, the first shape deformation part (500) can stably support the battery cell (EC) by adjusting the upper and lower positions of the upper support block (341) as needed.

[0211]

[0212] FIGS. 16a to 16i disclose a second shape deformation part (600) according to embodiments of the present invention.

[0213] Referring to FIGS. 16a to 16i, the second shape-deforming part (600) can be placed on the upper support block (341). The second shape-deforming part (600) can move the movable block (341a) of the upper support block (341) along the first direction (D3). In other words, by adjusting the horizontal position of the movable block (341a), the movable block (341a) can stably support the lower part of the battery cell (EC).

[0214] Here, the horizontal position of the moving block (341a) can be defined as the position on the first direction (D1) of the moving block (341a).

[0215] In an embodiment of the present invention, a first shape-deforming part (500) and a second shape-deforming part (600) may be implemented together on a cell support block (340). In this case, the second shape-deforming part (600) may be located above the first shape-deforming part (500). Alternatively, only the second shape-deforming part (600) may be implemented on the cell support block (340).

[0216] The second shape deformation part (600) may include a second gear block (611), a second gear shaft (612), a second link block (613), a second adjustment head (614), a second head shaft (614a), a second head block (615), a second through hole (616), a second receiving space (617), a second main locking part (620), and a second sub-locking part (630).

[0217] Referring to FIGS. 16d and 16f, the second link block (613) can be connected to the side of the movable block (341a). The second link block (613) can be extended and positioned along the longitudinal direction (D2) of the movable block (341a) on the side of the movable block (341a).

[0218] The second gear block (611) may be positioned at the bottom of the second link block (613). A plurality of gear teeth may be formed in the first direction (D1) on the second gear block (611). The second gear block (611) may be positioned extending along the longitudinal direction (D2) of the second link block (613) at the bottom of the second link block (613).

[0219] In an embodiment of the present invention, the second link block (613) and the second gear block (611) may generally have a rectangular shape, but are not necessarily limited thereto.

[0220] A plurality of gear teeth may be formed on the outer surface of the second gear shaft (612). The plurality of gear teeth of the second gear shaft (612) and the plurality of gear teeth of the second gear block (611) may mesh with each other. The second gear shaft (612) may be extended and positioned in the second direction (D2).

[0221] The second receiving space (617) may be formed inside the upper support block (341). The second gear shaft (612) may be placed in the second receiving space (617).

[0222] The second head block (615) may be placed on the side of the upper support block (341). A second through hole (616) may be formed inside the second head block (615) along the second direction (D2).

[0223] The second adjustment head (614) may be positioned on the side of the upper support block (341). The second adjustment head (614) may include a second head shaft (614a). The second head shaft (614a) is inserted into the second through hole (616) and may be connected to the end of the second gear shaft (612).

[0224] According to the above structure, when the second adjustment head (614) is turned, the second gear shaft (612) can rotate. When the second gear shaft (612) rotates, the second gear block (611) can move along the first direction (D1). Accordingly, the horizontal position of the moving block (341a) can be adjusted.

[0225] Referring to FIGS. 16d and FIGS. 16e, it can be seen that the horizontal position of the moving block (341a) changes as the second adjustment head (614) is rotated.

[0226]

[0227] Referring to FIG. 16g and FIG. 16h, the second main locking part (620) can fix the rotational position of the second adjustment head (614).

[0228] The second main locking part (620) may include a second locking groove (621), a second elastic groove (624), a second elastic body (623), and a second locking projection (622). The second locking groove (621) may be formed concavely inwardly on the second through hole (616). The second locking groove (621) may include a plurality of second locking grooves (621). A plurality of second locking grooves (621) may be arranged along the circumferential direction on the inner surface of the second through hole (616). The second elastic groove (624) may be formed concavely inwardly on the second head axis (614a).

[0229] The second elastic body (623) may be placed in the second elastic body groove (624). In an embodiment of the present invention, the second elastic body (623) may be a coil spring, but is not necessarily limited thereto.

[0230] The second locking projection (622) can be connected to the end of the second elastic body (623). The second locking projection (622) is inserted into the second locking groove (621) and can fix the rotational position of the second adjustment head (614).

[0231] The second adjustment head (614) can be manually rotated by an administrator using a wrench, power tool, etc. Alternatively, the administrator can use a controller to connect a separate automatic tool device to the second adjustment head (614), and the separate automatic tool device can rotate the second adjustment head (614).

[0232] When the second adjustment head (614) is rotated, the second locking projection (622) can move past one of the multiple second locking grooves (621) to an adjacent second locking groove (621). Then, the rotational position of the second adjustment head (614) can be fixed at the position of the other second locking groove (621).

[0233] The second sub-locking part (630) may include a second sub-hole (633) and a second fixing member (631). The second sub-hole (633) may be formed in the second head block (615). The second sub-hole (633) penetrates the second head block (615) and may communicate with the outside through the second through hole (616). A female screw thread (633a) may be formed on the inner surface of the second sub-hole (633).

[0234] The second fixing member (631) can be inserted into the second subhole (633). A male thread portion (631a) may be formed on the outer surface of the second fixing member (631). The male thread portion (631a) of the second fixing member (631) and the female thread portion (633a) of the second subhole (633) may interlock with each other.

[0235] The end of the second fixing member (631) can press against and come into contact with the second head shaft (614a). In other words, frictional resistance occurs between the end of the second fixing member (631) and the second head shaft (614a), which can prevent the second head shaft (614a) from rotating. Accordingly, since the second gear shaft (612) cannot rotate, the horizontal position of the movable block (341a) can be fixed.

[0236] When the second head shaft (614a) is to be rotated, the second fixing member (631) can be rotated in one direction so that the end of the second fixing member (631) does not come into contact with the second head shaft (614a). Accordingly, since frictional resistance between the end of the second fixing member (631) and the second head shaft (614a) is eliminated, the second adjustment head (614) can be rotated to rotate the second head shaft (614a) and the second gear shaft (612). The horizontal position of the movable block (341a) can also be adjusted.

[0237] After adjusting the horizontal position of the movable block (341a), the second fixing member (631) can be rotated in the opposite direction so that the end of the second fixing member (631) contacts the second head shaft (614a). Accordingly, the end of the second fixing member (631) can press against and contact the second head shaft (614a). Strong frictional resistance may occur between the end of the second fixing member (631) and the second head shaft (614a), and the second head shaft (614a) and the second gear shaft (612) cannot rotate. The horizontal position of the movable block (341a) can be fixed.

[0238] The second fixing member (631) can be manually rotated by an administrator using a wrench, power tool, etc. Alternatively, the administrator can use a controller to connect a separate automatic tooling device to the second fixing member (631), and the separate automatic tooling device can rotate the second fixing member (631).

[0239] In an embodiment of the present invention, the rotational position of the 21st adjustment head can be fixed using the 2nd main locking part (620) and the 2nd sub locking part (630). After adjusting the horizontal position of the movable block (341a) by rotating the 2nd adjustment head (614), the adjusted horizontal position of the movable block (341a) can be fixed by fixing the 2nd adjustment head (614) again.

[0240]

[0241] Referring to FIG. 16i, the width of the pouch-type battery cell (EC) can be formed with various lengths depending on the design specifications. In some cases, the width of the pouch-type battery cell (EC) may be smaller than the distance between adjacent upper support blocks (341). In this case, the upper support blocks (341) cannot stably support the lower part of the battery cell (EC).

[0242] For example, as disclosed in FIG. 16i, the width of the battery cell (EC) can be defined as the second pouch length (H2). And the distance between adjacent upper support blocks (341) can be defined as the second distance (D2). If the second pouch length (H2) is smaller than the second distance (D2), the lower part of the battery cell (EC) may not be supported by the ribs (341b) and the moving block (341a) of the upper support block (341). In this case, the battery cell (EC) may fall downward, and the pressing part (300) may not be able to properly press the battery cell (EC), and thus the uniform pressing performance of the pressing part (300) may be reduced.

[0243] Therefore, it is necessary to adjust the horizontal position in which the movable block (341a) supports the battery cell (EC). The manager can manually rotate the second adjustment head (614) using a wrench, power tool, etc. Alternatively, the manager can use a controller to attach a separate automatic tool device to the second adjustment head (614), and the separate automatic tool device can rotate the second adjustment head (614).

[0244] Accordingly, the horizontal position of the movable block (341a) can be adjusted. In FIG. 16i, the movable block (341a) can move along the first direction (D1) toward the second frame (220). As the movable block (341a) of the upper support block (341) is moved, the horizontal distance at which the rib (341b) and the movable block (341a) support the lower part of the battery cell (EC) can be increased.

[0245] Since the second distance (D2) between adjacent upper support blocks (341) is smaller than the second pouch length (H2) of the battery cell (EC), the moving block (341a) and the rib (341b) can stably support the lower part of the battery cell (EC).

[0246] In addition to the example described above, the second shape-deforming part (600) can stably support the battery cell (EC) by adjusting the horizontal position of the moving block (341a) as needed. In other words, the second shape-deforming part (600) can adjust the horizontal distance between the rib (341b) of the upper support block (341) and the moving block (341a) in correspondence with the second pouch length (H2) of the battery cell (EC). Accordingly, the cell support block (340) can stably support the lower part of the battery cell (EC).

[0247] The tray device (100) according to an embodiment of the present invention can stably support a pouch-type secondary battery through the above-described configuration, thereby enabling a uniform pressure to be applied to the pouch-type secondary battery. This can improve the performance of the pouch-type secondary battery.

[0248] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto and can be implemented with various modifications within the scope of the claims, the detailed description of the invention, and the attached drawings, and it is obvious that such modifications also fall within the scope of the present invention.

Claims

1. A device frame comprising a first frame, a second frame and a support frame, wherein the first frame and the second frame are spaced apart at a predetermined interval along a first direction (D1), and the support frame connects the first frame and the second frame; A pressurizing unit disposed on the above device frame and configured to pressurize a battery cell, wherein the pressurizing unit comprises a driving unit, a pressurizing unit and a cell support block, wherein the driving unit is disposed on the first frame and connected to the pressurizing unit, wherein the pressurizing unit is disposed inside the above device frame and configured to pressurize the battery cell, and wherein the cell support block is configured to support the lower part of the battery cell; and A height adjustment unit disposed on the device frame and connected to the cell support block; comprising A tray device configured such that the height adjustment unit moves the cell support block along a third direction (D3).

2. In Paragraph 1, The above-mentioned pressurizing unit is, A first end plate connected to the above-mentioned drive unit; A second end plate spaced apart from the first end plate along the first direction (D1) at a predetermined distance; A plurality of pressure plates disposed between the first end plate and the second end plate, and a battery cell disposed between each of the plurality of pressure plates; and It includes a post connected to the first frame and the second frame and arranged along the first direction (D1). A tray device in which the above post is positioned to penetrate the first end plate, the second end plate, and the plurality of pressure plates, and the post guides the first end plate, the second end plate, and the plurality of pressure plates to move along the first direction (D1).

3. In Paragraph 2, The above-mentioned pressurizing unit is, A link arm connecting the above plurality of pressure plates; A first link member connecting one side of the above link arm to one of the plurality of pressure plates; and A second link member connecting the other side of the above link arm to another pressure plate among the plurality of pressure plates; A tray device in which another pressure plate is disposed between the above-mentioned pressure plate and the above-mentioned pressure plate.

4. In Paragraph 3, A link hole is formed on the other side of the above link arm, and The above link hole is extended along the longitudinal direction of the above link arm, and The above second link is a tray device connected to the above link hole.

5. In Paragraph 3, The above-mentioned pressurizing unit is, A first upper end arm connecting the first end plate and the pressure plate; and It further includes a first lower end arm connecting the first end plate and the pressure plate, Based on the above third direction (D3), the first upper end arm is positioned on the upper part of the first lower end arm, and The first lower end arm connects the first end plate and the pressure plate closest to the first end plate among the plurality of pressure plates, and A tray device configured such that the first upper end arm is configured to connect the first end plate and the second pressure plate adjacent to the first end plate among the plurality of pressure plates.

6. In Paragraph 3, The above-mentioned pressurizing unit is, A second upper end arm connecting the second end plate and the pressure plate; and It further includes a second lower end arm connecting the second end plate and the pressure plate, Based on the third direction (D3) above, the second upper end arm is positioned on the upper part of the second lower end arm, and The second lower end arm connects the second end plate and the pressure plate closest to the second end plate among the plurality of pressure plates, and A tray device configured such that the second upper end arm is configured to connect the second end plate and the second pressure plate adjacent to the second end plate among the plurality of pressure plates.

7. In Paragraph 2, The above-mentioned pressurizing unit is, A first stopper disposed on the surface facing the second end plate on the second frame; and A second stopper disposed on the surface of the second end plate facing the first stopper; comprising The above-mentioned first stopper is, A stopper block coupled to the second frame above; A stopper fastening part threaded into the adjustment hole of the stopper block; and It includes a stopper head portion connected to the stopper fastening portion and protruding in the direction of the second stopper; The range of movement of the second end plate is adjusted by adjusting the degree of screw thread fastening between the stopper fastening part and the adjustment hole, and The above second stopper is a tray device formed in a plate shape.

8. In Paragraph 2, The above-mentioned pressurizing unit is, It further includes a cell guard portion disposed on the side of the above-mentioned pressure plate, and A tray device configured such that the cell guard portion is positioned between the plurality of pressure plates to support the side of the battery cell.

9. In Paragraph 8, The above cell guard part is, A cell guard body disposed on the side of the above-mentioned pressure plate; A fastening hole formed on the cell guard body, wherein the fastening hole is extended along a second direction (D2); A fastener inserted into the above fastening hole and connecting the side of the cell guard body and the pressure plate; and It includes guard blocks protruding in the first direction (D1) from both sides of the cell guard body; The above guard block is configured to support the side of the battery cell, and A tray device that adjusts the position of the guard block along the second direction (D2) by adjusting the relative position of the fastening hole and the fastening section.

10. In Paragraph 2, The above-mentioned drive unit is, A shaft bracket disposed penetrating the first frame, a through hole formed along the first direction (D1) on the shaft bracket, and a first screw portion formed on the inner surface of the through hole; and A drive shaft disposed through the through hole of the shaft bracket; comprising, A tray device having a clutch portion formed at one end of the drive shaft, the other end of the drive shaft connected to the first end plate, and a second screw portion formed on a part of the outer surface of the drive shaft to engage with the first screw portion.

11. In Paragraph 10, The above-mentioned drive unit is, A pressure block disposed on a part of the outer surface of the drive shaft, wherein the pressure block protrudes radially on the drive shaft; A pressure flange disposed on the second end plate; and A bearing unit disposed between the above-mentioned pressure block and the above-mentioned pressure flange; A tray device further comprising 12. In Paragraph 2, The above cell support block is, A lower support block connected to the height adjustment part above; and Includes an upper support block positioned on the upper part of the lower support block; The above upper support block includes a rib protruding upward, and A tray device in which the lower part of the battery cell is seated on the upper part of the rib.

13. In Paragraph 12, The height adjustment unit above is, A height adjustment shaft penetrating the lower support block, wherein the height adjustment shaft is arranged along the first direction (D1); A height adjustment block connected to the end of the height adjustment shaft, wherein a block hole is formed on the height adjustment block; Height adjustment holes formed in each of the first frame and the second frame, the height adjustment holes are extended in a third direction (D3); and A height adjustment member inserted into the height adjustment hole and connected to the block hole; A tray device including 14. In Paragraph 13, A pressure surface is formed along the third direction (D3) on the height adjustment hole, and The height adjustment mechanism described above includes a head portion and a stem portion, and The head portion is pressed and contacts the pressure surface portion, and A tray device in which the above stem portion and the above block hole are connected by screw threads.

15. In Paragraph 12, It further includes a first shape deformation part disposed on the lower support block; and A tray device in which the first shape deformation part is configured to move the upper support block along the third direction (D3).

16. In Paragraph 15, The above-mentioned first shape deformation part is, A first link block connected to the lower part of the upper support block; A first gear block disposed at the lower part of the first link block, and a plurality of gear teeth are formed on the first gear block in the third direction (D3). A first gear shaft meshing with the first gear block, wherein the first gear shaft is positioned in a first receiving space formed inside the lower support block, and the first gear shaft is positioned in a second direction (D2); A first head block disposed on the side of the lower support block; A first adjustment head that penetrates the first through hole of the first head block and is connected to the first gear shaft; comprising A tray device wherein the first adjustment head includes a first head shaft, and the first head shaft is connected to the end of the first gear shaft.

17. In Paragraph 16, The above-mentioned first shape deformation part is, A first main locking part that fixes the rotational position of the first adjustment head; and It further includes a first sub-locking part that fixes the rotational position of the first adjustment head; and The above-mentioned first main locking part is, A first locking groove formed concavely in the first through hole; A first elastic groove formed concavely in the first head shaft; A first elastic body disposed in the first elastic body groove; and It includes a first locking projection connected to the end of the first elastic body; and The first locking projection is inserted into the first locking groove and is configured to fix the rotational position of the first adjustment head, and The above-mentioned first sublocking part is, A first subhole formed in the first head block; and It includes a first fixing member inserted into the first subhole; and A tray device in which the first subhole and the first fixing member are thread-coupled, and the end of the first fixing member is pressed and contacted by the first head shaft.

18. In Paragraph 12, It further includes a second shape deformation part disposed on the upper support block; and A tray device configured such that the second shape deformation part moves the moving block of the upper support block in a first direction (D1).

19. In Paragraph 18, The above second shape deformation part is, A second link block connected to the side of the above-mentioned moving block; A second gear block disposed at the lower part of the second link block, and a plurality of gear teeth are formed on the second gear block in the first direction (D1). A second gear shaft meshing with the second gear block, wherein the second gear shaft is positioned in a second receiving space formed inside the upper support block, and the second gear shaft is positioned in a second direction (D2); A second head block disposed on the side of the upper support block; A second adjustment head that penetrates the second through hole of the second head block and is connected to the second gear shaft; comprising A tray device wherein the second adjustment head includes a second head shaft, and the second head shaft is connected to the end of the second gear shaft.

20. In Paragraph 19, The above second shape deformation part is, A second main locking part that fixes the rotational position of the second adjustment head; and It further includes a second sub-locking part that fixes the rotational position of the second adjustment head; and The above second main locking part is, A second locking groove formed concavely in the second through hole; A second elastic groove formed concavely in the second head shaft; A second elastic body disposed in the second elastic body groove; and It includes a second locking projection connected to the end of the second elastic body; and The second locking projection is inserted into the second locking groove and is configured to fix the rotational position of the second adjustment head, and The above second sublocking part is, A second subhole formed in the second head block; and It includes a second fixing member inserted into the second subhole; and A tray device in which the second subhole and the second fixing member are thread-coupled, and the end of the second fixing member is pressed and contacted by the second head shaft.

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