US 11,685,289 B2Granted

Charging and discharging device, methods of battery charging and discharging, and charging and discharging system

AssigneeContemporary Amperex Technology Co., Limited

InventorsJinfeng Gao, Chen Qi, Xiyang Zuo, Xiaojian Huang

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Abstract

Embodiments of the present application provide a charging and discharging device. The charging and discharging device includes an AC/DC converter, a first DC/DC converter, a second DC/DC converter and a control unit. The control unit is used to: receive a first charging request, the first charging request including a first charging voltage and a first charging current; set output power of the first DC/DC converter based on the first charging voltage and the first charging current; turn on the second DC/DC converter if an SOC of the energy storage unit is greater than a first threshold to charge the battery by the energy storage unit; and adjust output power of the second DC/DC converter, so as to enable a voltage difference between a bus voltage and a bus balance voltage of the charging and discharging device to be less than or equal to a preset value.

Claims20

Dependent claims

A charging and discharging device, comprising an alternating current/direct current (AC/DC) converter, a first direct current/direct current (DC/DC) converter, a second DC/DC converter and a control unit, wherein one end of the second DC/DC converter is connected between the first DC/DC converter and the AC/DC converter and the other end of the second DC/DC converter is connected to an energy storage unit;

and
the control unit is configured to:
receive a first charging request transmitted by a battery management system (BMS) of a battery, the first charging request comprising a first charging voltage and a first charging current,
set output power of the first DC/DC converter as first output power of the first DC/DC converter based on the first charging voltage and the first charging current,
acquire a state of charge (SOC) of the energy storage unit,
turn on the second DC/DC converter under the condition that the SOC of the energy storage unit is greater than a first threshold, to charge the battery by the energy storage unit through the first DC/DC converter and the second DC/DC converter,
acquire a bus voltage of the charging and discharging device in real time, and
adjust output power of the second DC/DC converter to the first output power of the second DC/DC converter under the condition that the battery is charged by the energy storage unit, the bus voltage is less than a bus balance voltage and a difference between the bus voltage and the bus balance voltage exceeds a preset value, the first output power of the second DC/DC converter being less than or equal to a maximum output power of the second DC/DC converter,
wherein the difference between the bus voltage and the bus balance voltage is less than or equal to the preset value after the output power of the second DC/DC converter is adjusted to the first output power of the second DC/DC converter.

6 more elements

A method of battery charging, applied to a charging and discharging device, wherein the charging and discharging device comprises an alternating current/direct current (AC/DC) converter, a first direct current/direct current (DC/DC) converter, a second DC/DC converter and a control unit, wherein one end of the second DC/DC converter is connected between the first DC/DC converter and the AC/DC converter and the other end of the second DC/DC converter is connected to an energy storage unit;

and
the method comprises:
receiving a first charging request transmitted by a battery management system (BMS) of a battery, the first charging request comprising a first charging voltage and a first charging current,
setting output power of the first DC/DC converter as first output power of the first DC/DC converter based on the first charging voltage and the first charging current,
acquiring a state of charge (SOC) of the battery of the energy storage unit,
turning on the second DC/DC converter under the condition that the SOC of the energy storage unit is greater than a first threshold, to charge the battery by the energy storage unit through the first DC/DC converter and the second DC/DC converter,
acquiring a bus voltage of the charging and discharging device in real time, and
adjust the output power of the second DC/DC converter to first output power of the second DC/DC converter under the condition that the battery is charged by the energy storage unit, the bus voltage is less than a bus balance voltage and a difference between the bus voltage and the bus balance voltage exceeds a preset value, the first output power of the second DC/DC converter being less than or equal to the maximum output power of the second DC/DC converter,
wherein the difference between the bus voltage and the bus balance voltage is less than or equal to the preset value after the output power of the second DC/DC converter is adjusted to the first output power of the second DC/DC converter.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/562,286Filed 27 Dec 2021 · continuation
Priority: 29 Jul 2021
Published: US 2023/0035744 A12 Feb 2023
Granted: 27 Jun 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

B60L 58/12
For monitoring or controlling batteries: responding to state of charge [SoC]
H02J 7/933
Regulation of charging or discharging current or voltage: the cycle being controlled or terminated in response to electric parameters
B60L 50/64
Using power supplied by batteries: constructional details of batteries specially adapted for electric vehicles
B60L 53/30
Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of…:…