# US 12,009,498 B2 · Battery pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,498 B2 - Document ID: US12009498B2 - Status: Granted - Kind: B2 - Application number: 17/058,954 - Filed: 2019-05-09 - Published: 2021-07-15 - Granted: 2024-06-11 - Earliest claimed: 2018-05-31 - Assignees: Honda Motor Co., Ltd. - Applicants: Honda Motor Co., Ltd. - Inventors: Rieko Koyama - Web page: https://patentgrep.com/patent/US12009498B2 ## CPC - H01M 10/6567: Liquids - H01M 10/6568: characterised by flow circuits, e.g. loops, located externally to the cells or cell casings - H01M 10/613: Cooling or keeping cold - 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 10/6556: Solid parts with flow channel passages or pipes for heat exchange (closed pipes H01M10/6552) - H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells - H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - H01M 50/224: Metals - 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) - H01M 50/271: Lids or covers for the racks or secondary casings - H01M 50/293: characterised by the material - 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 - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A battery pack is provided with: a battery module having a cell stack configured by stacking a plurality of cells; and a cooling mechanism for cooling the battery module. The cooling mechanism is a refrigerant flow passage through which a liquid medium passes. The cell stack and the refrigerant flow passage are arranged with a bottom plate interposed therebetween. A plurality of protrusions are provided on the lower surface of the bottom plate. The plurality of protrusions are arranged in a staggered pattern along the stacking direction of the cells. ## Claims ### Claim 1 A battery pack comprising: a battery module including a cell stack configured by stacking a plurality of cells; and a cooling mechanism for cooling the battery module, wherein the cooling mechanism is a refrigerant flow path through which a liquid medium passes, the cell stack and the refrigerant flow path are arranged with a partition wall being interposed therebetween, the partition wall forms a part of the refrigerant flow path and has a surface provided with a plurality of convex portions, the plurality of convex portions are arranged in a staggered manner along a stacking direction of the cells, and each of the convex portions is a quadrangular pyramid having a square bottom surface, and is arranged such that one of two diagonal lines is in the stacking direction. ### Claim 2 (depends on 1) The battery pack according to claim 1, wherein the plurality of convex portions are arranged in the staggered manner in a direction orthogonal to the stacking direction. ### Claim 3 (depends on 1) A battery pack according to claim 1, wherein comprising: a battery module including a cell stack configured by stacking a plurality of cells; and a cooling mechanism for cooling the battery module, wherein the cooling mechanism is a refrigerant flow path through which a liquid medium passes, the cell stack and the refrigerant flow path are arranged with a partition wall being interposed therebetween, the partition wall forms a part of the refrigerant flow path and has a surface provided with a plurality of convex portions, the plurality of convex portions are arranged in a staggered manner along a stacking direction of the cells, a plurality of concave portions corresponding to the plurality of convex portions are provided on a facing surface of the partition wall which faces the cell stack, and the partition wall is manufactured by aluminum die casting. ### Claim 4 (depends on 3) The battery pack according to claim 3, wherein a heat transfer sheet is provided between a bottom surface of the cell stack and the facing surface. ### Claim 5 A battery pack comprising: a battery module including a cell stack configured by stacking a plurality of cells; and a cooling mechanism for cooling the battery module, wherein the cooling mechanism is a refrigerant flow path through which a liquid medium passes, the cell stack and the refrigerant flow path are arranged with a partition wall being interposed therebetween, the partition wall forms a part of the refrigerant flow path and has a surface provided with a plurality of convex portions, the plurality of convex portions are arranged in a staggered manner along a stacking direction of the cells, the partition wall is a bottom plate of the battery module, a concave portion is provided on a lower surface of the bottom plate, the concave portion is sealed at a bottom portion of a battery case housing the battery module, and the refrigerant flow path is formed by the concave portion of the battery case bottom plate and the bottom portion of the battery case. ### Claim 6 (depends on 1) The battery pack according to claim 1, wherein the partition wall is a bottom portion of a battery case housing the battery module, a lower surface of the bottom portion is provided with a concave portion, the concave portion is sealed with a cover member, and the refrigerant flow path is formed by the concave portion of the battery case and the cover member.