# US 11,444,353 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 11,444,353 B2 - Document ID: US11444353B2 - Status: Granted - Kind: B2 - Application number: 15/655,052 - Filed: 2017-07-20 - Published: 2018-02-01 - Granted: 2022-09-13 - Earliest claimed: 2016-07-29 - Assignees: Denso Corporation; Yazaki Corporation - Applicants: Denso Corporation; Yazaki Corporation - Inventors: Hiroyoshi Yamamoto; Shota Iguchi; Koji Yamashita; Hisato Inoue; Yoshiaki Ichikawa; Katsunori Sato; Hidehiro Takasugi - Web page: https://patentgrep.com/patent/US11444353B2 ## CPC - H01M 10/613: Cooling or keeping cold - H01M 10/625: Vehicles - H01M 10/627: Stationary installations, e.g. power plant buffering or backup power supplies - H01M 10/647: Prismatic or flat cells, e.g. pouch cells - H01M 10/6561: Gases - H01M 10/6566: Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers (H01M10/6565 takes precedence) - H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence) - H01M 50/227: Organic material - H01M 50/24: adapted for protecting batteries from their environment, e.g. from corrosion (thermal insulation H01M10/658) - H01M 50/271: Lids or covers for the racks or secondary casings - H01M 50/507: comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules - H01M 50/51: Connection only in series - H01M 50/569: Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals (battery terminal connectors with integrated measuring arrangements G01R31/364) - 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 has bus bars, a battery stack which is an assembly of plural battery cells, a bus bar casing which supports a bus bar casing, and a cover member. Electrode terminals of battery cells adjacently arranged in the battery stack are connected together through the bus bars. An upstream side passage and a downstream side passage are formed between the bus bars and the cover member. Upstream side wall surfaces forming an inlet part of the upstream side passage or downstream side wall surfaces forming an outlet part of the downstream side passage is arranged at a location closer to the battery cell side than a location of a surface of the bus bar side. ## Claims ### Claim 1 A battery pack comprising: a battery casing section having an upper surface; a plurality of battery cells accommodated in the battery casing section and stacked in a predetermined stacking direction, each of the plurality of battery cells having an upper end surface and a pair of positive and negative electrode terminals projecting from the upper end surface of the corresponding one of the plurality of battery cells; a conductive-member casing section mounted to face the upper surface of the battery casing section; a plurality of conductive members disposed in the conductive-member casing section, each of the plurality of conducive members being configured to electrically connect between the positive electrode terminal of a selected one of the battery cells and the negative electrode terminal of a selected other one of the battery cells so that the battery cells are electrically connected in series; and a cover member arranged to face the conductive members to thereby form a cooling fluid passage between the cover member and the conductive members, the cooling fluid passage enabling cooling fluid to flow, wherein: the conductive-member casing section has opposing first and second walls in a flow direction of the cooling fluid passage, the flow direction of the cooling fluid passage being perpendicular to the predetermined stacking direction of the plurality of battery cells, the cover member has opposing first and second ends in the flow direction of the cooling fluid passage, the first end of the cover member is arranged to project toward the first wall of the conductive-member casing section to form an inlet opening between the first end of the cover member and the first wall of the conductive-member casing section, the inlet opening constituting an inlet of the cooling fluid passage, the second end of the cover member is arranged to project toward the second wall of the conductive-member casing section to form an outlet opening between the second end of the cover member and the second wall of the conductive-member casing section, the outlet opening constituting an outlet of the cooling fluid passage, and each of the first and second walls of the conductive-member casing section is located to be closer to the battery cells than an upper surface of the conductive members is. ### Claim 2 (depends on 1) The battery pack according to claim 1, wherein: each of the inlet opening and the outlet opening has a cross sectional area, one of the inlet opening and the outlet opening is located to be closer to the battery cells than the other of the inlet opening and the outlet opening is, and the cross sectional area of the one of the inlet opening and the outlet opening is smaller than the cross sectional area of the other of the inlet opening and the outlet opening. ### Claim 3 (depends on 1) The battery pack according to claim 1, wherein: at least one of the plurality of conductive members includes radiation fins located to be closer to one of the inlet opening and the outlet opening than to the other of the inlet opening and the outlet opening; each of the inlet opening and the outlet opening has a cross sectional area; and the cross sectional area of the one of the inlet opening and the outlet opening is smaller than the cross sectional area of the other of the inlet opening and the outlet opening. ### Claim 4 (depends on 1) The battery pack according to claim 1, wherein: the cooling fluid passage comprises: an upstream side passage; an intermediate communication passage; and a downstream side passage; the upstream side passage is communicated with the downstream side passage through the intermediate communication passage, the intermediate communication passage is comprised of wall surfaces of the cover member, and at least a part of the wall surfaces of the cover member is located to be closer to the battery cells than the upper surface of the conductive members is. ### Claim 5 (depends on 4) The battery pack according to claim 4, wherein: each of the plurality of battery cells comprises a safety valve, the cover member comprises a duct part that constitutes a gas discharge passage that is communicated with the safety valve of each of the battery cells, and the intermediate communication passage is arranged crossing the gas discharge passage, and located to be closer to the battery cell sides than the gas discharge passage is. ### Claim 6 (depends on 5) The battery pack according to claim 5, wherein: the inlet opening of the cooling fluid passage comprises inlet opening parts, each of the inlet opening parts being located to face a center of a corresponding one of the conductive members in a cell thickness direction perpendicular to the stacking direction, and the outlet opening of the cooling fluid passage comprises outlet opening parts, each of the outlet opening parts being located to face a center of a corresponding one of the conductive members in the cell thickness direction. ### Claim 7 (depends on 4) The battery pack according to claim 4, wherein: the inlet opening of the cooling fluid passage comprises inlet opening parts, each of the inlet opening parts being located to face a center of a corresponding one of the battery cells in a cell thickness direction perpendicular to the stacking direction, the outlet opening of the cooling fluid passage comprises outlet opening parts, each of the outlet opening parts being located to face a center of a corresponding one of the battery cells in the cell thickness direction, and the intermediate communication passage is arranged to face both sides of the battery cells in the cell stacking direction. ### Claim 8 (depends on 1) The battery pack according to claim 1, wherein: each of the plurality of conductive members comprises: a contact part arranged to contact the positive electrode terminal of a selected one of the battery cells and the negative electrode terminal a selected another one of the battery cells; and a bent part shaped to be farther from the battery cells than the contact part is, wherein the bent part of each of the conductive members and the battery cells define a passage therebetween through which the cooling fluid flows.