US 12,381,295 B2
Battery pack with a pressure management system
Mark Kotik, Rochester Hills, MI (US); Adam Bisaro, Shelby Township, MI (US); and Robert Koch, Troy, MI (US)
Assigned to Robert Bosch LLC, Plymouth, MI (US); and Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/599,259
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Mar. 29, 2020, PCT No. PCT/US2020/025600
§ 371(c)(1), (2) Date Sep. 28, 2021,
PCT Pub. No. WO2020/214386, PCT Pub. Date Oct. 22, 2020.
Claims priority of provisional application 62/834,135, filed on Apr. 15, 2019.
Prior Publication US 2022/0181756 A1, Jun. 9, 2022
Int. Cl. H01M 50/30 (2021.01); H01M 50/213 (2021.01); H01M 50/271 (2021.01); H01M 50/578 (2021.01)
CPC H01M 50/578 (2021.01) [H01M 50/213 (2021.01); H01M 50/271 (2021.01); H01M 50/30 (2021.01); H01M 2220/20 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A battery pack, comprising:
a battery pack housing, the battery pack housing comprising a container and a lid that closes an open end of the container and is joined to the open end of the container via a fluid-impermeable seal;
a battery module that is disposed in the battery pack housing, the battery module comprising a module housing and electrochemical cells disposed in the module housing; and
a vent block that is disposed on the lid, the vent block comprising:
an internal vacancy,
a longitudinal bore that extends between an exterior of the vent block and the internal vacancy, the longitudinal bore having fluid communication with an interior space of the battery pack housing,
a first transverse bore that extends between the exterior of the vent block and the internal vacancy, the first transverse bore including a first vent that is normally closed and opens at a predetermined fluid pressure, and
a second transverse bore that extends between the exterior of the vent block and the internal vacancy, the second transverse bore including a second vent that is fluid impermeable and air permeable;
a pressure compensation device disposed in the battery pack housing, the pressure compensation device including an interior space; and
a fitting that connects the vent block to the pressure compensation device, the fitting including:
a first end that is connected to the longitudinal bore;
a second end that is opposed to the first end;
a sidewall that extends between the first end and the second end, the sidewall having an inner surface that defines a longitudinal fluid passage that extends between the first end and the second end; and
a transverse fluid passage that extends between an opening in the sidewall and the longitudinal fluid passage, and the interior space of the pressure compensation device is in fluid communication with an interior space of the vent block via the transverse fluid passage and the longitudinal fluid passage,
wherein the battery pack housing is flooded with a dielectric fluid, and
wherein the vent block configures the battery pack to accommodate volume changes of the dielectric fluid within the battery pack housing.