US 12,142,784 B2
Battery pack with a pressure management system including a compensating device
Mark Kotik, Rochester Hills, MI (US); Adam Bisaro, Shelby Township, MI (US); and Sebastian Schoch, Ingersheim (DE)
Assigned to Robert Bosch LLC, Plymouth, MI (US); and Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/599,956
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Mar. 29, 2020, PCT No. PCT/US2020/025601
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/214387, PCT Pub. Date Oct. 22, 2020.
Prior Publication US 2022/0158295 A1, May 19, 2022
Int. Cl. H01M 50/325 (2021.01); H01M 10/44 (2006.01); H01M 10/613 (2014.01); H01M 50/213 (2021.01); H01M 50/271 (2021.01)
CPC H01M 50/325 (2021.01) [H01M 10/445 (2013.01); H01M 10/613 (2015.04); H01M 50/213 (2021.01); H01M 50/271 (2021.01); H01M 2200/20 (2013.01); H01M 2220/20 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A battery pack comprising:
a battery pack housing, the battery pack housing comprising a container, and 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,
a vent block that is disposed on the lid, the vent block comprising:
a first bore that opens on a lid-facing surface of the vent block;
a second bore that opens on a side surface of the vent block and includes a first vent that is fluid impermeable and air impermeable, and that opens at a predetermined fluid pressure;
a third bore that is disposed on another side surface of the vent block and includes a second vent that is fluid impermeable and air permeable,
a bladder that is disposed in the battery pack housing between the module housing and the battery pack housing, the bladder comprising a bladder housing that is fluid impermeable and defines a closed bladder interior space; and
a primary fitting that provides a fluid passageway between the bladder interior space and the first and second vents,
wherein the battery pack housing is filled with a first fluid that is dielectric, and the bladder interior space includes a second fluid that is different from the first fluid, and the bladder expands and contracts to accommodate volume changes of the first fluid due to changes in the environment of the battery pack.