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"Battery Case Comprising Gas Adsorption Layer"

Abstract: The present invention relates to a battery case in which an electrode assembly is received together with an electrolyte, the electrode assembly having a structure comprising a positive electrode, a negative electrode, and a separator interposed therebetween, wherein a gas adsorption layer is formed on the inner surface of the battery case, and the gas adsorption layer comprises a gas adsorption material layer for adsorbing gas generated inside a battery, and a barrier layer formed on the outer surface of the gas adsorption material layer so as to prevent the gas adsorption material layer from being exposed to the outside.

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Patent Information

Application #
Filing Date
18 November 2019
Publication Number
26/2020
Publication Type
INA
Invention Field
ELECTRICAL
Status
Email
mahua.ray@remfry.com
Parent Application
Patent Number
Legal Status
Grant Date
2024-01-19
Renewal Date

Applicants

LG CHEM, LTD.
128,Yeoui-daero Yeongdeungpo-gu Seoul 07336

Inventors

1. JEONG, Hee Seok
LG Chem Research Park,188, Munji-ro, Yuseong-gu Daejeon 34122
2. LEE, Eun Ju
LG Chem Research Park, 188, Munji-ro Yuseong-gu Daejeon 34122
3. KIM, Hyun Min
LG Chem Research Park, 188, Munji-ro Yuseong-gu Daejeon 34122
4. CHOI, Jong Hwan
LG Chem Research Park, 188, Munji-ro Yuseong-gu Daejeon 34122

Specification

SUMMARY The present invention relates to a battery including a battery case, and it comprises a gas adsorption layer, the gas adsorption layer is formed on the inner surface the cell case that specifically facing the electrode assembly, wherein the gas adsorption layer is a gas generated in the battery before certain conditions gas adsorbent material layer and the gas adsorbing material layer for adsorbing, the present invention relates to a battery case including a barrier layer formed on the outer surface of the gas adsorbing material layer not exposed to the outside. BACKGROUND [2] Rechargeable secondary batteries is electric vehicles (EV), hybrid electric vehicles (HEV), which is presented as an alternative to such conventional gasoline and diesel vehicles, plug-in high-output, large-capacity, including hybrid electric vehicles (Plug-In HEV) It has attracted attention as a power source of the vehicle is required. [3] Secondary battery may be classified as cylindrical, prismatic, pouch type depending on the shape. Among them can be stacked with high integration and has attracted a lot of interest in a pouch-shaped low and deformation is easily high in energy density per weight. In particular, the aluminum pouch-shaped battery using a laminate sheet as a sheathing member, due to advantages such that the light and manufacturing cost is low and easy deformation has attracted much attention recently. [4] However, since the last sealing, if the leads to the abnormal operation state such as internal short circuit, overcharge, exposure to high temperature, as the internal electrolyte decomposition may occur of the high-pressure gas. At this time, the high pressure gas is generated is lead to deformation of the battery case, and can shorten the life of the battery, it is severely resulting in ignition of the battery to explode. [5] For example, if the overheated battery generates gas and the gas pressure in the pouch case it may lead to continual overheating and gas production to further promote the degradation of the battery element, and that this process reaches more than any critical point ignition of the battery or it may cause an explosion. Furthermore, if a plurality of unit cells are concentrated in a limited space, such as a battery module may cause a serious accident. [6] Conventionally, in order to improve the safety of the battery, PTC (Positive Temperature Coefficient), using a method such as a fuse, or a low pressure protection circuit, or although using a method of adding an additive to improve the stability in the electrolytic solution or the electrode, wherein the optionally provided with the same means, a problem in that the gas resulting from the reactions in the battery, or the battery performance due to the addition of the material is reduced under the abnormal condition still exists. [7] In recent years, more so as the demand for high energy density increasing part was the existing gas pockets features are going to gradually disappear, even without degrading the overall performance of the battery, ignition of the gas occurs, the battery in the battery cells within a limited space to it requires a new way to prevent explosions and efficiently remove the gas. [8] Patent Document 1, but discloses a laminate sheet including a gas adsorbent polymer layer containing gas adsorbent polymer, there is no structure capable of protecting the gas adsorbent polymer layer. Therefore, the effect of the gas present in the air in the cell assembly to adsorb only the gas generated in the bar, the internal battery that can be adsorbed to the gas adsorbent polymer layer is rapidly reduced. [9] Patent Document 2 when a gas adsorption layer between the laminated sheet metal layer and a sealant layer, and due to heat or pressure generated inside the external impact or cell wherein the sealant layer is removed by the gas adsorption layer is exposed occurs in the battery However, discloses a secondary battery capable of adsorbing gas, gas absorption of the secondary battery has a problem to consist only significant abnormality control an already hot battery. [10] Patent Document 3, but discloses a laminate sheet including a gas adsorbent polymer layer to adsorb the gas generated in the battery, do not have a structure capable of protecting the gas adsorbent polymer layer is in the air, gas in the battery assembly process the effect of adsorbing the bar internal cell gas adsorbed in the gas adsorbent polymer layer can be lowered. [11] (Prior art document) [12] Patent Document 1: Republic of Korea Patent Application Publication No. 2017-0082328 No. [13] Patent Document 2: Republic of Korea Patent Application Publication No. 2016-0037473 No. [14] (Patent Document 3), Republic of Korea Patent Application Publication No. 2017-0064796 No. Detailed Description of the Invention SUMMARY [15] The present invention serves to solve the problem as described above, the battery assembly of not have been exposed to the outside air, the battery to be only adsorbed effectively gas generated inside the battery case, a gas consisting of a gas adsorbent material layer and the barrier layer of the inner surface to provide a battery case including the absorption layer and the purpose. Problem solving means [16] In the battery case, the battery case and the electrode assembly of the structure which is interposed a separator between the positive electrode and the negative electrode, and an anode and a cathode to be housed together with the electrolyte according to the present invention for achieving the above objects, in the battery case the gas adsorption layer on the side surface is formed, block in which the gas adsorption layer is formed on the outer surface of the adsorbent so that the gas adsorbent material layer and the gas adsorbing material layer for adsorbing a gas generated in the unit cell are exposed to the outside gas material layer It may be made of a structure consisting of a layer. [17] The gas adsorption layer may be formed on at least a part or the entire area of ​​the inner compartment of the cell case that electrolytic solution is in contact. [18] The blocking layer is a bar which can be made of a material that is dissolved or dispersed in the electrolytic solution, the barrier layer is exposed to the inner surface of the dissolved or dispersed by the electrolytic solution after the gas-adsorbing material layer cell can be injected into the battery case, do. [19] The blocking layer may be not impermeable to gas, if the substances that can be dissolved or dispersed in an electrolyte, which is not necessarily that type is severely limited, specifically, the polymer film. [20] In one specific example, the barrier layer is formed of at least a film-like part melting by contact with the electrolyte. The film is air impermeable mothamyeonseo, a carbonate-based solvent of the electrolyte solution in contact with the electrolytic solution can be at least partially melted film to penetrate the film of the molecules and molecules. Further, the film may be polystyrene (PS), polyamides, acrylonitrile, polyvinyl alcohol, polycarbonate, polyethylene vinyl acetate, a polymer film is selected from the OPS. [21] In addition, the barrier layer is formed of a bar with a solid or gel-type electrolyte, it is possible to compensate for the spent electrolyte during gas generation will have improved lifetime characteristics. [22] The gas adsorbent material layers include at least one gas adsorbent material is selected from the group consisting of organic-inorganic compound or a metal with a gas adsorbent. [23] The gas adsorbent material is not necessarily that if the material which can exhibit the effect desired to easily adsorb the gas generated in large percentage in the interior of the battery cell, the type is severely limited, particularly, the minute with a gas adsorbent itself It may be at least one selected from the group consisting of (molecular sieve) and a metal component. [24] With the gas adsorption molecular sieve may be at least one selected from silica gel, carbon fiber, a porous carbon material, porous metal oxides, porous gel comprising the group. [25] Here, the porous carbon material is carbon molecular sieves (molecular sieve), and be at least one selected from the group consisting of activated carbon, and the porous metal oxide may be at least one selected from the group consisting of zeolite, silica gel and alumina have. [26] In addition, the metal component is nickel (Ni), platinum (Pt), palladium (Pd), calcium (Ca), strontium (Sr), barium (Ba), and thallium (Ti), zirconium (Zr), hafnium (Hf) , vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum can be at least one selected from the group consisting of (Mo) and tungsten (W). [27] In addition, sodium hydroxide (NaOH), calcium hydroxide (Ca (OH) 2 can be used), potassium hydroxide (KOH). [28] Further, in consideration of the kinds of the electrode active material and an electrolytic solution is used, the selective gas removal can be achieved by designing such that the amount to include a specific gas adsorbent material capable of adsorbing many gas. [29] The cell case may be composed of a laminated pouch or metal can type comprising an outer covering layer, a metal layer and an inner resin layer. [30] The outer coating layer is the outside made of a high tensile strength and weather resistance are required, polyethylene terephthalate (PET) or oriented nylon (ONy) to protect reliably the electrode assembly to the external environment, so forming an outer surface of the pouch-shaped battery case, the coating layer can satisfy the requirements as described above. When the battery case can type the strength as the laminate sheet is not required. [31] As the metal layer is a layer to block the gas, moisture or the like, including the air, the moldability can be excellent and, given a predetermined strength and it is desirable to block moisture and air, aluminum, aluminum alloys, copper, stainless steel and the like can be used as an iron alloy. [32] In one specific example, it can contain a gas adsorbent material inside the resin layer. [33] When a gas adsorbent material contained in the internal resin layer, it is possible to reduce the cell thickness, it is possible to improve energy density by reducing unnecessary space in the battery. [34] At this time, the gas adsorbent material may be included in total 40% to 90% by weight, based on the weight of the inner resin layer, specifically, 50 may be included in% by weight to 90% by weight, more particularly 50 Jungnang% to 80 it may be included in weight percent. [35] If the said gas adsorbent material comprises less than 40% by weight, based on the total weight of the inner resin layer, since the amount of gas adsorbed on the use process of the common cell down can result in swelling phenomenon in a short period of time, 90 If you are over weight%, it is a problem that the sealing force may be reduced is not appropriate. [36] In addition, the gas adsorbent material is in addition to the outer resin layer of the laminated sheet, but also can be formed as a separate layer, this time shall be given in the layer itself including a gas adsorbent material is material which imparts a separate adhesive. [37] The present invention also provides a battery including the battery case. [38] The battery may be a primary cell or a secondary cell. [39] The secondary battery according to the shape of the battery case, the electrode assembly are cylindrical or rectangular cylindrical battery or incorporated in a metal can prismatic battery and the electrode assembly may be a pouch-shaped battery that is embedded in a pouch-shaped case of the aluminum laminate sheet have. [40] The secondary battery may be a lithium secondary battery composed of a lithium salt-containing non-water-based structure, which is the electrolyte is impregnated into the electrode assembly of a membrane structure disposed between the anode and the cathode. [41] The cathode is, for example, the positive electrode current collector and containing a positive electrode active material in the whole phase was dried produced after applying the positive electrode mixture, which, in the positive electrode material mixture, if necessary, binder, conductive material, filler, etc. are optionally further with It may also be included. [42] The cathode current collector is generally fabricated to have a thickness of 3㎛ to 500㎛. The cathode current collector, so long as having a high conductivity without causing chemical changes in the fabricated battery is not particularly limited, for example, of stainless steel, aluminum, nickel, titanium, sintered carbon, or aluminum or stainless steel carbon on the surface, nickel, titanium, can be used as such as to a surface treatment or the like. In addition, the cathode current collector, the same manner as the anode current collector from, and processed to form fine irregularities on the surface thereof may also improve the adhesion of the positive electrode active material, films, sheets, foils, nets, porous structures, foams and non-woven fabrics and various the form is possible. [43] The positive electrode active material is a material that can cause the electrochemical reaction, the lithium transition as the metal oxide, and includes two or more transition metals, e.g., lithium cobalt oxide substituted with one or more transition metal (LiCoO 2 ), lithium nickel oxide (LiNiO 2 layered compound, and the like); One or more transition metals in the lithium manganese oxide substituted; Formula LiNi 1-y M y O 2 (where, M = Co, Mn, Al , Cu, Fe, Mg, B, Cr, Zn or Ga and Lim, 0.01≤y≤0.7 include one or more elements of the element) lithium nickel-based oxide, which is represented by; Li 1 + z Ni 1/3 Co 1/3 Mn 1/3 O 2 , Li 1 + z Ni 0.4 Mn 0.4 Co 0.2 O 2Such as Li 1 + z Ni b Mn c Co 1- (b + c + d) M d O (2-e) A e (where, -0.5≤z≤0.5, 0.1≤b≤0.8, 0.1≤c≤ 0.8, 0≤d≤0.2, 0≤e≤0.2, b + c + d <1 Lim, M = Al, and Mg, Cr, Ti, Si or Y, a = F, P or Cl Im), which is represented by the lithium nickel cobalt manganese composite oxide; Formula Li 1 + x M 1-y M ' y PO 4-z X z , and (wherein, M = a transition metal, preferably Fe, Mn, Co or Ni, M' = Al, Mg or Ti, X = F, and S or N, there can be -0.5≤x≤ + 0.5, 0≤y≤0.5, 0≤z≤0.1, etc. Im) in response, expressed in bingye lithium metal phosphate, it is not limited to these. [44] Based on the total weight of the mixture including the cathode active material with the conductive material it is typically added at a 1% to 30% by weight. This conductive material so long as it has suitable conductivity without causing chemical changes in the fabricated battery is not particularly limited, for example, graphite such as natural graphite or artificial graphite; Carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, carbon black and thermal black; Conductive fibers such as carbon fibers and metallic fibers; Metal such as carbon fluoride, aluminum, nickel powder, powder; Conductive whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Poly is a conductive material such as phenylene derivative may be used. [45] The binder is a component assisting in binding to the total binding and the home, such as the active material and the conductive material is commonly added in the total mixture weight, includes the cathode active material in 1% to 30% by weight. Examples of the binder include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose by Woods (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinyl pyrrolidone, ethylene, polyethylene tetrafluoroethylene , polypropylene, ethylene-mentioned diene monomer (EPDM), sulfonated EPDM, styrene butylene rubber (SBR), fluoro rubber and various copolymers, such as the propylene. [46] The filler is selectively used as a component of suppressing the expansion of the electrodes, if the standing fibrous materials without causing chemical changes in the fabricated battery is not particularly limited, for example, olefin polymerization, such as polyethylene, polypropylene; And fibrous materials such as glass fiber and carbon fiber. [47] The cathode is, for example, after applying a negative electrode mixture containing the negative electrode active material on a negative electrode current collector and drying prepared by, in the negative electrode material mixture, if necessary, a conductive material such as described above, a binder, a filler, etc. they may contain ingredients. [48] The anode current collector is generally fabricated to have a thickness of 3㎛ to 500㎛. The anode current collector, if it has suitable conductivity without causing chemical changes in the fabricated battery is not particularly limited, for example, of copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel carbon on the surface, nickel, titanium, is surface-treated with, and aluminum-cadmium alloys. Also Similar to the cathode current collector, to form fine irregularities on the surface may enhance the bonding strength between the negative electrode active material, films, sheets, foils, nets, porous structures, foams and non-woven fabrics or the like can be used in various forms. [49] The negative electrode active material is, for example, including the above-described silicon compound, a carbon-I, such as graphitized carbon, graphite-based carbon; Li x Fe 2 O 3 (0≤x≤1), Li x WO 2 (0≤x≤1), Sn x Me 1-x Me'yO z (Me is Mn, Fe, Pb, Ge; Me ' is metal composite oxides such as 1≤z≤8); Al, B, P, Si, Group 1 of the Periodic Table, Group 2, Group 3 element, a halogen; 0

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Section Controller Decision Date

Application Documents

# Name Date
1 201917046914-IntimationOfGrant19-01-2024.pdf 2024-01-19
1 201917046914.pdf 2019-11-18
2 201917046914-PatentCertificate19-01-2024.pdf 2024-01-19
2 201917046914-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [18-11-2019(online)].pdf 2019-11-18
3 201917046914-Written submissions and relevant documents [18-01-2024(online)].pdf 2024-01-18
3 201917046914-STATEMENT OF UNDERTAKING (FORM 3) [18-11-2019(online)].pdf 2019-11-18
4 201917046914-PROOF OF RIGHT [18-11-2019(online)].pdf 2019-11-18
4 201917046914-Correspondence to notify the Controller [27-12-2023(online)].pdf 2023-12-27
5 201917046914-US(14)-ExtendedHearingNotice-(HearingDate-04-01-2024).pdf 2023-12-19
5 201917046914-PRIORITY DOCUMENTS [18-11-2019(online)].pdf 2019-11-18
6 201917046914-FORM 1 [18-11-2019(online)].pdf 2019-11-18
6 201917046914-Correspondence to notify the Controller [01-12-2023(online)].pdf 2023-12-01
7 201917046914-FORM-26 [01-12-2023(online)].pdf 2023-12-01
7 201917046914-DRAWINGS [18-11-2019(online)].pdf 2019-11-18
8 201917046914-US(14)-HearingNotice-(HearingDate-05-12-2023).pdf 2023-11-01
8 201917046914-DECLARATION OF INVENTORSHIP (FORM 5) [18-11-2019(online)].pdf 2019-11-18
9 201917046914-COMPLETE SPECIFICATION [18-11-2019(online)].pdf 2019-11-18
9 201917046914-Response to office action [23-10-2023(online)].pdf 2023-10-23
10 201917046914-FORM 3 [13-10-2023(online)].pdf 2023-10-13
10 abstract.jpg 2019-11-19
11 201917046914-FORM 3 [05-05-2023(online)].pdf 2023-05-05
11 201917046914-FORM-26 [19-11-2019(online)].pdf 2019-11-19
12 201917046914-Power of Attorney-211119.pdf 2019-11-23
12 201917046914-Response to office action [02-05-2023(online)].pdf 2023-05-02
13 201917046914-OTHERS-211119.pdf 2019-11-23
13 201917046914-Response to office action [21-12-2022(online)].pdf 2022-12-21
14 201917046914-Correspondence-211119.pdf 2019-11-23
14 201917046914-FORM 3 [07-12-2022(online)].pdf 2022-12-07
15 201917046914-8(i)-Substitution-Change Of Applicant - Form 6 [24-11-2022(online)].pdf 2022-11-24
15 201917046914-Correspondence-211119-.pdf 2019-11-23
16 201917046914-ASSIGNMENT DOCUMENTS [24-11-2022(online)].pdf 2022-11-24
16 201917046914-FORM 3 [08-05-2020(online)].pdf 2020-05-08
17 201917046914-PA [24-11-2022(online)].pdf 2022-11-24
17 201917046914-FORM 3 [21-10-2020(online)].pdf 2020-10-21
18 201917046914-FORM 3 [07-04-2021(online)].pdf 2021-04-07
18 201917046914-Response to office action [01-11-2022(online)].pdf 2022-11-01
19 201917046914-FORM 18 [02-06-2021(online)].pdf 2021-06-02
19 201917046914-FORM 3 [28-06-2022(online)].pdf 2022-06-28
20 201917046914-ABSTRACT [25-01-2022(online)].pdf 2022-01-25
20 201917046914-FORM 3 [10-09-2021(online)].pdf 2021-09-10
21 201917046914-CLAIMS [25-01-2022(online)].pdf 2022-01-25
21 201917046914-FER.pdf 2021-10-18
22 201917046914-COMPLETE SPECIFICATION [25-01-2022(online)].pdf 2022-01-25
22 201917046914-FORM 4(ii) [10-01-2022(online)].pdf 2022-01-10
23 201917046914-CORRESPONDENCE [25-01-2022(online)].pdf 2022-01-25
23 201917046914-OTHERS [25-01-2022(online)].pdf 2022-01-25
24 201917046914-FER_SER_REPLY [25-01-2022(online)].pdf 2022-01-25
24 201917046914-DRAWING [25-01-2022(online)].pdf 2022-01-25
25 201917046914-DRAWING [25-01-2022(online)].pdf 2022-01-25
25 201917046914-FER_SER_REPLY [25-01-2022(online)].pdf 2022-01-25
26 201917046914-CORRESPONDENCE [25-01-2022(online)].pdf 2022-01-25
26 201917046914-OTHERS [25-01-2022(online)].pdf 2022-01-25
27 201917046914-COMPLETE SPECIFICATION [25-01-2022(online)].pdf 2022-01-25
27 201917046914-FORM 4(ii) [10-01-2022(online)].pdf 2022-01-10
28 201917046914-CLAIMS [25-01-2022(online)].pdf 2022-01-25
28 201917046914-FER.pdf 2021-10-18
29 201917046914-ABSTRACT [25-01-2022(online)].pdf 2022-01-25
29 201917046914-FORM 3 [10-09-2021(online)].pdf 2021-09-10
30 201917046914-FORM 18 [02-06-2021(online)].pdf 2021-06-02
30 201917046914-FORM 3 [28-06-2022(online)].pdf 2022-06-28
31 201917046914-FORM 3 [07-04-2021(online)].pdf 2021-04-07
31 201917046914-Response to office action [01-11-2022(online)].pdf 2022-11-01
32 201917046914-FORM 3 [21-10-2020(online)].pdf 2020-10-21
32 201917046914-PA [24-11-2022(online)].pdf 2022-11-24
33 201917046914-ASSIGNMENT DOCUMENTS [24-11-2022(online)].pdf 2022-11-24
33 201917046914-FORM 3 [08-05-2020(online)].pdf 2020-05-08
34 201917046914-8(i)-Substitution-Change Of Applicant - Form 6 [24-11-2022(online)].pdf 2022-11-24
34 201917046914-Correspondence-211119-.pdf 2019-11-23
35 201917046914-Correspondence-211119.pdf 2019-11-23
35 201917046914-FORM 3 [07-12-2022(online)].pdf 2022-12-07
36 201917046914-Response to office action [21-12-2022(online)].pdf 2022-12-21
36 201917046914-OTHERS-211119.pdf 2019-11-23
37 201917046914-Power of Attorney-211119.pdf 2019-11-23
37 201917046914-Response to office action [02-05-2023(online)].pdf 2023-05-02
38 201917046914-FORM 3 [05-05-2023(online)].pdf 2023-05-05
38 201917046914-FORM-26 [19-11-2019(online)].pdf 2019-11-19
39 201917046914-FORM 3 [13-10-2023(online)].pdf 2023-10-13
39 abstract.jpg 2019-11-19
40 201917046914-COMPLETE SPECIFICATION [18-11-2019(online)].pdf 2019-11-18
40 201917046914-Response to office action [23-10-2023(online)].pdf 2023-10-23
41 201917046914-DECLARATION OF INVENTORSHIP (FORM 5) [18-11-2019(online)].pdf 2019-11-18
41 201917046914-US(14)-HearingNotice-(HearingDate-05-12-2023).pdf 2023-11-01
42 201917046914-FORM-26 [01-12-2023(online)].pdf 2023-12-01
42 201917046914-DRAWINGS [18-11-2019(online)].pdf 2019-11-18
43 201917046914-FORM 1 [18-11-2019(online)].pdf 2019-11-18
43 201917046914-Correspondence to notify the Controller [01-12-2023(online)].pdf 2023-12-01
44 201917046914-US(14)-ExtendedHearingNotice-(HearingDate-04-01-2024).pdf 2023-12-19
44 201917046914-PRIORITY DOCUMENTS [18-11-2019(online)].pdf 2019-11-18
45 201917046914-PROOF OF RIGHT [18-11-2019(online)].pdf 2019-11-18
45 201917046914-Correspondence to notify the Controller [27-12-2023(online)].pdf 2023-12-27
46 201917046914-Written submissions and relevant documents [18-01-2024(online)].pdf 2024-01-18
46 201917046914-STATEMENT OF UNDERTAKING (FORM 3) [18-11-2019(online)].pdf 2019-11-18
47 201917046914-PatentCertificate19-01-2024.pdf 2024-01-19
47 201917046914-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [18-11-2019(online)].pdf 2019-11-18
48 201917046914-IntimationOfGrant19-01-2024.pdf 2024-01-19
48 201917046914.pdf 2019-11-18

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