US 12,341,172 B2
Heating control method for energy storage, energy storage system, and photovoltaic energy storage system
Gang Wang, Xi'an (CN); and Aitang Chen, Shanghai (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Dec. 4, 2023, as Appl. No. 18/527,628.
Claims priority of application No. 202211562184.1 (CN), filed on Dec. 7, 2022.
Prior Publication US 2024/0194967 A1, Jun. 13, 2024
Int. Cl. H01M 10/63 (2014.01); H01M 10/42 (2006.01); H01M 10/48 (2006.01); H01M 10/615 (2014.01); H01M 50/512 (2021.01); H02J 3/32 (2006.01); H02J 3/38 (2006.01); H02J 7/00 (2006.01); H02J 7/35 (2006.01)
CPC H01M 10/63 (2015.04) [H01M 10/425 (2013.01); H01M 10/482 (2013.01); H01M 10/615 (2015.04); H01M 50/512 (2021.01); H02J 3/32 (2013.01); H02J 3/38 (2013.01); H02J 7/00032 (2020.01); H02J 7/0013 (2013.01); H02J 7/0048 (2020.01); H02J 7/007194 (2020.01); H02J 7/35 (2013.01); H01M 2010/4271 (2013.01); H02J 2207/20 (2020.01); H02J 2300/26 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A heating control method for energy storage, wherein the method is applied to an photovoltaic energy storage system, the photovoltaic energy storage system comprises a photovoltaic array, an inverter, and an energy storage system, the inverter comprises a DC/DC converter and a DC/AC converter that are connected by using a direct-current bus, the DC/DC converter is connected to the photovoltaic array and performs maximum power point tracking (MPPT) on power-generation power from the photovoltaic array, the DC/AC converter is connected to a load and/or a power grid, the energy storage system comprises a plurality of battery packs connected in parallel and a controller, a parallel connection point of the plurality of battery packs is connected to the controller or the direct-current bus, and the battery pack comprises a cell pack, a temperature control module, a temperature sensing module, and a battery management system (BMS); and the method comprises:
receiving, by the controller, a heating request of each of the plurality of battery packs and a state of charge (SOC) of each of the plurality of battery packs;
adjusting, by the controller based on a difference between a voltage of the direct-current bus and a charging voltage reference value of the energy storage system, a quantity N of battery packs whose temperature control modules are to be enabled, wherein Nis an integer greater than or equal to 1; and
determining, by the controller based on the SOCs of the plurality of battery packs, priorities for enabling the respective temperature control modules of the plurality of battery packs, and enabling the temperature control modules of the N battery packs in the plurality of battery packs.