# US 2026/0100441 A1 · Battery pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100441 A1 - Document ID: US20260100441A1 - Status: Published application - Kind: A1 - Application number: 19/351,017 - Filed: 2025-10-06 - Published: 2026-04-09 - Earliest claimed: 2024-10-07 - Assignees: Honda Motor Co., Ltd. - Applicants: Honda Motor Co., Ltd. - Inventors: Keitaro ARUGA; Yusuke OKAMOTO - Web page: https://patentgrep.com/patent/US20260100441A1 ## CPC - H01M 10/6556: Solid parts with flow channel passages or pipes for heat exchange (closed pipes H01M10/6552) - H01M 10/613: Cooling or keeping cold - H01M 10/625: Vehicles - H01M 10/6554: Rods or plates - H01M 10/6567: Liquids - H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells - H01M 50/668: {Means for preventing spilling of liquid or electrolyte, e.g. when the battery is tilted or turned over} - H01M 50/673: Containers for storing liquids; Delivery conduits therefor - 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 battery cells, a first case body accommodating the battery cells, a second case body provided above the battery cells accommodated in the first case body and accommodating the battery cells, a first water jacket provided on a bottom portion of the first case body and configured to allow a refrigerant to flow therethrough to adjust a temperature of the battery cells accommodated in the first case body, and a second water jacket provided on a bottom portion of the second case body, communicating with the first water jacket, and configured to allow the refrigerant to flow therethrough to adjust a temperature of the battery cells accommodated in the second case body. The second case body has an erect wall erected around the second water jacket, and a discharge portion configured to discharge the refrigerant leaking from the second water jacket to the first case body. ## Claims ### Claim 1 A battery pack comprising: a plurality of battery cells; a first case body accommodating the battery cells; a second case body provided above the battery cells accommodated in the first case body and accommodating the battery cells; a first water jacket provided on a bottom portion of the first case body and configured to allow a refrigerant to flow therethrough to adjust a temperature of the battery cells accommodated in the first case body; and a second water jacket provided on a bottom portion of the second case body, communicating with the first water jacket, and configured to allow the refrigerant to flow therethrough to adjust a temperature of the battery cells accommodated in the second case body, wherein the second case body is provided with: an erect wall erected around the second water jacket and configured to receive the refrigerant leaking from the second water jacket; and a discharge portion configured to discharge the refrigerant leaking from the second water jacket to a specific position of the first case body. ### Claim 2 (depends on 1) The battery pack according to claim 1, wherein the second case body is provided with a second plate member that seals and covers an upper surface of the bottom portion from above, the second water jacket is provided in a space defined between the upper surface of the bottom portion of the second case body and the second plate member, and the erect wall of the second case body is erected around the second plate member. ### Claim 3 (depends on 2) The battery pack according to claim 2, wherein the first case body is provided with a first plate member that seals a lower surface of the bottom portion from below, and the first water jacket is provided in a space defined between the lower surface of the first case body and the first plate member. ### Claim 4 (depends on 1) The battery pack according to claim 1, wherein the specific position of the first case body is a position different from the battery cells accommodated in the first case body. ### Claim 5 (depends on 1) The battery pack according to claim 1, wherein the discharge portion of the second case body includes: a discharge path extending from a notch provided in the erect wall; and a discharge port provided in the discharge path and opened at a position not overlapping the battery cells accommodated in the first case body as viewed from above. ### Claim 6 (depends on 1) The battery pack according to claim 1, wherein the second case body includes a case fixing portion fixed to the first case body, and the discharge portion of the second case body is provided integrally with the case fixing portion. ### Claim 7 (depends on 1) The battery pack according to claim 1, further comprising: a pipe member extending in an upper-lower direction and configured to connect the first water jacket and the second water jacket, wherein the first water jacket and the second water jacket each are provided with a connection portion, the connection portion having an insertion hole through which the pipe member is inserted and being connected to the pipe member via an O-ring, and an outer periphery of the pipe member is provided with an elastic member that is pressed in the upper-lower direction and abuts against the connection portion of the first water jacket or the connection portion of the second water jacket. ### Claim 8 (depends on 7) The battery pack according to claim 7, wherein the elastic member includes a notch provided in a portion pressed against the connection portion. ### Claim 9 (depends on 1) The battery pack according to claim 1, wherein a cross member is provided in the first case body, and a communication flow path connecting the first water jacket and the second water jacket is disposed at a position overlapping the cross member as viewed from above.