US 12,445,036 B2
Energy storage apparatus and energy storage apparatus control method
Zhanjing Zhang, Xi'an (CN); Fuwen Chen, Xi'an (CN); and Xinran Yang, Shenzhen (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Mar. 11, 2024, as Appl. No. 18/600,846.
Claims priority of application No. 202310481084.4 (CN), filed on Apr. 26, 2023.
Prior Publication US 2024/0364206 A1, Oct. 31, 2024
Int. Cl. H02J 3/32 (2006.01); H02J 7/00 (2006.01); H02J 7/34 (2006.01); H02M 1/00 (2006.01); H02M 3/158 (2006.01)
CPC H02M 1/0058 (2021.05) [H02J 3/32 (2013.01); H02J 7/0047 (2013.01); H02J 7/00712 (2020.01); H02M 1/0067 (2021.05); H02M 3/1582 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An energy storage apparatus, comprising:
a battery, a direct current/direct current (DC/DC) conversion circuit, a controller, a first branch, and a second branch,
the battery is connected to a first end of the DC/DC conversion circuit, the first branch and the second branch are connected directly in parallel between a first end of a power converter and a second end of the DC/DC conversion circuit, impedance of the first branch is less than that of the second branch, and the power converter is connected in parallel to a first capacitor;
wherein the first branch comprises a first switch, the second branch comprises a second switch, a diode, and a first resistor, and a conduction direction of the diode is from the power converter to the DC/DC conversion circuit; and
the controller is configured to:
when a difference between a voltage at the second end of the DC/DC conversion circuit and a voltage at the first end of the power converter is greater than or equal to a first voltage threshold, control the second branch to be connected, so that the energy storage apparatus charges the first capacitor through the second branch; and
when the difference between the voltage at the second end of the DC/DC conversion circuit and the voltage at the first end of the power converter is less than or equal to a second voltage threshold, control the second branch to be disconnected and the first branch to be connected, wherein the first voltage threshold is greater than the second voltage threshold.