# US 12,603,347 B2 · Method for designing battery module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,347 B2 - Document ID: US12603347B2 - Status: Granted - Kind: B2 - Application number: 17/825,828 - Filed: 2022-05-26 - Published: 2022-12-01 - Granted: 2026-04-14 - Earliest claimed: 2021-05-27 - Assignees: SK On Co., Ltd. - Applicants: SK On Co., Ltd. - Inventors: Seo Roh Rhee; Hae Ryong Jeon; Yang Kyu Choi - Web page: https://patentgrep.com/patent/US12603347B2 ## CPC - H01M 10/653: characterised by electrically insulating or thermally conductive materials - H01M 50/105: Pouches or flexible bags - H01M 10/625: Vehicles - H01M 10/647: Prismatic or flat cells, e.g. pouch cells - H01M 10/6551: Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings - H01M 10/6554: Rods or plates - H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells - H01M 50/211: adapted for pouch cells - H01M 50/233: characterised by physical properties of casings or racks, e.g. dimensions - H01M 50/249: specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) - G01R 27/2605: {Measuring capacitance (capacitive sensors G01D5/24)} - G01R 27/2617: {Measuring dielectric properties, e.g. constants (testing dielectric strength G01R31/12; detecting insulation faults G01R31/52; G01R27/2688 takes precedence)} - G01R 31/006: {on road vehicles, e.g. automobiles or trucks (testing of ignition installations peculiar to internal combustion engines F02P17/00)} - G01R 31/392: Determining battery ageing or deterioration, e.g. state of health - G01R 31/52: Testing for short-circuits, leakage current or ground faults - H01M 50/289: characterised by spacing elements or positioning means within frames, racks or packs (spacing elements inside cells other than separators, membranes or diaphragms H01M50/471) - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Provided is a method for designing a battery module including a cell assembly in which a plurality of battery cells are stacked and a module case having an internal space in which the cell assembly is accommodated, the method including: a) setting a lowermost portion of the module case with respect to a direction of gravity as a design side, and setting a region between the design side and the cell assembly as a design space; and b) obtaining a relative permittivity εr of the design space satisfying Equation 1 εrε0A0/T1≤PCy by assuming that a shape of the design space is a form of a film having an area of A0 and a thickness of T0. ## Claims ### Claim 1 A method for designing a battery module including a cell assembly in which a plurality of battery cells are stacked and a module case having an internal space in which the cell assembly is accommodated, the method comprising: step a) setting a lowermost portion of the module case with respect to a direction of gravity as a design side, and setting a region between the design side and the cell assembly as a design space; step b) obtaining a relative permittivity & of the design space satisfying Equation 1 εrε0A0/T0≤PCy (Equation 1), wherein the design space is formed of a film having an area of A0 and a thickness of T0, wherein the area of A0 is substantially equal to the area of the lowermost portion of the module case of the battery module, wherein Cy is a Y-capacitance value of the battery module and has a value of 1 to 30 nF, P is a real number less than 1, and ε0 is a permittivity of vacuum; and step c) providing the battery module including the design space having the relative permittivity & obtained in step b). ### Claim 2 (depends on 1) The method of claim 1, wherein the P is 0.5 to 0.95. ### Claim 3 (depends on 1) The method of claim 1, wherein the relative permittivity in an alternating current of 1 kHz to 1 MHz is obtained, which satisfies Equation 1, in the step b). ### Claim 4 (depends on 1) The method of claim 1, wherein a stacking direction of the battery cells is an in-plane direction of the design side, and in the step a), the lowermost portion of the module case is set as a cooling side at the same time as the design side. ### Claim 5 (depends on 4) The method of claim 4, further comprising: after the step a) and before the step b), step i) obtaining a first thermal conductivity that satisfies the following Equation 2 based on a thermal conductivity of the design space and a thermal resistance of the battery module according to a contact area between the design space and the cell assembly, Rth(0.33)≤1.3 Rth(1) [Equation 2] wherein in Equation 2, Rth(0.33) is the thermal resistance of the battery module when the contact area is 0.33 A0, and Rth(1) is the thermal resistance of the battery module when the contact area is 1 A0. ### Claim 6 (depends on 5) The method of claim 5, further comprising: after the step i), step ii) obtaining a thickness Tc of a film that satisfies the following Equation 3 based on the thermal resistance of the battery module according to a value of the first thermal conductivity and a film thickness, Rth(t)≤Rth(Lim) [Equation 3] wherein in Equation 3, Rth (t) is the thermal resistance of the battery module according to the film thickness, and Rth (Lim), which is a design value, is the thermal resistance of the battery module. ### Claim 7 (depends on 1) The method of claim 1, wherein the battery cell is a pouch-type battery cell. ### Claim 8 (depends on 1) The method of claim 1, wherein T0 is 0.3 mm to W, wherein W is a thickness of one battery cell of the plurality of battery cells.