US 11,751,356 B2
Rack backup energy unit with advanced thermal management system
Tianyi Gao, San Jose, CA (US)
Assigned to BAIDU USA LLC, Sunnyvale, CA (US)
Filed by Baidu USA LLC, Sunnyvale, CA (US)
Filed on Sep. 24, 2021, as Appl. No. 17/484,301.
Prior Publication US 2023/0098147 A1, Mar. 30, 2023
Int. Cl. H05K 7/20 (2006.01)
CPC H05K 7/20327 (2013.01) [H05K 7/20309 (2013.01); H05K 7/20318 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A coolant management unit for providing liquid cooling for backup battery unit (BBU) modules of an electronic rack, the coolant management unit comprising:
a BBU supply manifold including a rack supply connector to receive cooling fluid from a rack supply manifold and a BBU supply connector to be connected to one of the BBU modules to distribute the cooling fluid;
a BBU return manifold to be coupled to a rack return manifold, wherein the BBU return manifold is to receive vapor from the BBU modules, wherein the cooling fluid is two-phase cooling fluid to extract heat from the BBU modules and to evaporate into the vapor into the BBU return manifold, wherein the vapor is transmitted to an external condenser via the rack return manifold to be condensed back to a liquid form; and
a balance loop connected to each of the BBU modules to establish a fluid connection amongst the BBU modules, such that a level of the cooling fluid in each of the BBU modules remains similar.