[One]The present invention relates to a current collector for a battery comprising a metal plate having a through-hole formed thereon and a porous reinforcing material filling the through-hole, and a secondary battery including the same. [2] This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0127753 on October 15, 2019, and all contents disclosed in the literature of the Korean patent application are incorporated as a part of this specification. background [3] As the price of energy sources increases due to the depletion of fossil fuels and interest in environmental pollution is increased, the demand for eco-friendly alternative energy sources is increasing. In particular, as technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing. [4] As the demand for secondary batteries diversifies and increases, various types of secondary batteries are being developed. Among them, there is an attempt at a structure in which the ionic conductivity of lithium ions in the thickness direction of the current collector is increased by using a current collector having a plurality of through holes. However, the current collector in which the through-hole is formed has limitations in that mechanical strength is lowered due to the formation of the through-hole, and a shape change due to stress concentration is induced. In addition, there is a problem of inhibiting ion transfer because gas components generated in the degradation process according to the operation of the battery are gathered in the through-holes and exist in the form of bubbles. [5] Therefore, there is a need for a new type of current collector that solves these problems or a secondary battery technology including the same. DETAILED DESCRIPTION OF THE INVENTION technical challenge [6] The present invention was devised to solve the above problems, and an object of the present invention is to provide a current collector for a battery comprising a metal plate having a through hole and a porous reinforcing material filling the through hole, and a secondary battery including the same. means of solving the problem [7] In one example, the current collector for a battery according to the present invention, a metal plate having a plurality of through-holes in the thickness direction; and a porous reinforcing material filled in the through hole of the metal plate. [8] In a specific example, the reinforcing material includes at least one selected from the group consisting of a polymer material, a fiber, an inorganic particle, and a carbon material. [9] In another specific example, the area fraction in which the through-holes are formed is in the range of 10 to 90%. [10] In one example, in the current collector for a battery according to the present invention, the porous reinforcing material has a porosity of 10 to 90%, and a permeability of 100 to 4000 s/100 mL. [11] In one example, the porous reinforcing material has an ionic conductivity of 1x10 -10 or more at 20°C . [12] In one example, the porous reinforcing material is, polyethylene (PE), polypropylene (PP), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVdF), carboxymethyl cellulose (CMC), epoxy resin and urethane at least one of resins. [13] In one example, the porous reinforcing material has a diameter of 5 to 50 μm and a structure in which fibers having an L/D of 20 or more are dispersed. [14] In a specific example, the porous reinforcing material further includes a lithium salt, wherein the lithium salt includes Li + as a cation and F - , Cl - , Br - , I - , NO 3 - , N(CN) as an anion. 2 - , BF 4 - , ClO 4 - , AlO 4 - , AlCl 4 - , PF 6 - SbF 6 - , AsF 6 - , BF 2 C 2 O 4 -, BC 4 O 8 - , (CF 3 ) 2 PF 4 - , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF 2 - , (CF 3 ) 5 PF - , (CF 3 ) 6 P - , CF 3 SO 3 - , C 4 F 9 SO 3 - , CF 3 CF 2 SO 3 - , (CF 3 SO 2 ) 2 N - , (FSO 2 ) 2 N - , CF 3 CF 2 (CF 3 ) 2 CO - , (CF 3 SO 2 ) 2 CH - , CF 3 (CF 2 ) 7SO 3 — , CF 3 CO 2 — , CH 3 CO 2 — , SCN — and (CF 3 CF 2 SO 2 ) 2 N — include at least one selected from the group consisting of. [15] In another specific example, the porous reinforcing material is BaTiO 3 , Pb(Zr,Ti)O 3 (PZT), Pb 1-a La a Zr 1-b Ti b O 3 (PLZT, where 0 [112] 100, 200, 300: current collector [113] 110, 210, 310: metal plate [114] 120, 220, 320: porous reinforcement [115] 400: electrode assembly [116] 410: positive electrode current collector [117] 411: positive electrode mixture layer [118] 420: negative electrode current collector [119] 421: negative electrode mixture layer [120] 431: first separator [121] 432: second separator WE CLAIMS a metal plate having a plurality of through-holes in the thickness direction; and a porous reinforcing material filled in the through hole of the metal plate. [Claim 2] The current collector for a battery according to claim 1, wherein the porous reinforcing material comprises at least one selected from the group consisting of a polymer material, a fiber, an inorganic particle, and a carbon material. [Claim 3] The current collector for a battery according to claim 1, wherein the area fraction in which the through hole is formed is in the range of 10 to 90%. [Claim 4] The current collector for a battery according to claim 1, wherein the porous reinforcing material has a porosity of 10 to 90% and air permeability of 100 to 4000 s/100 mL. [Claim 5] The current collector for a battery according to claim 1, wherein the porous reinforcing material has an ionic conductivity of 1x10 -10 S/cm or more at 20°C . [Claim 6] According to claim 1, wherein the porous reinforcing material, polyethylene (PE), polypropylene (PP), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVdF), carboxymethyl cellulose (CMC), an epoxy resin and A current collector for a battery, comprising at least one of urethane resins. [Claim 7] The current collector for a battery according to claim 1, wherein the porous reinforcing material has a diameter of 5 to 50 μm and a structure in which fibers having an L/D of 20 or more are dispersed. [Claim 8] The method according to claim 1, wherein the porous reinforcing material further comprises a lithium salt, wherein the lithium salt contains Li + as a cation and F - , Cl - , Br - , I - , NO 3 - , N ( CN) 2 - , BF 4 - , ClO 4 - , AlO 4 - , AlCl 4 - , PF 6 - SbF 6 - , AsF 6 - , BF 2 C 2 O 4 -, BC 4 O 8 - , (CF 3 ) 2 PF 4 - , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF 2 - , (CF 3 ) 5 PF - , (CF 3 ) 6 P - , CF 3 SO 3 - , C 4 F 9 SO 3 - , CF 3 CF 2 SO 3 - , (CF 3 SO 2 ) 2 N - , (FSO 2 ) 2 N - , CF 3 CF 2 (CF 3 ) 2 CO - , (CF 3 SO 2 ) 2 CH - , CF 3 (CF 2 ) 7SO 3 - , CF 3 CO 2 - , CH 3 CO 2 - , SCN - and (CF 3 CF 2 SO 2 ) 2 N - A current collector for a battery comprising at least one selected from the group consisting of. [Claim 9] The method according to claim 1, wherein the porous reinforcing material is BaTiO 3 , Pb(Zr,Ti)O 3 (PZT), Pb 1-a La a Zr 1-b Ti b O 3 (PLZT, where 0