Energy storage module and energy storage system

Patent metadata

Field	Value
Publication number	US-2024235238-A9
Application number	US-202318240482-A
Country	US
Kind code	A9
Filing date	Aug 31, 2023
Priority date	Oct 21, 2022
Publication date	Jul 11, 2024
Grant date	—

Abstract

An energy storage module includes a bus connection part, a battery pack, a capacitor and a series compensation DC conversion device. A first conduction terminal of the series compensation DC conversion device is electrically connected with a positive bus connection terminal and a negative bus connection terminal of the bus connection part, or the first conduction terminal is connected with a battery positive terminal and a battery negative terminal of the battery pack. A second conduction terminal of the series compensation DC conversion device is electrically connected with two terminals of the capacitor. A four-quadrant DC/DC converter of the series compensation DC conversion device controls the capacitor to generate a compensation voltage to compensate a voltage between the two terminals of the battery pack, or the four-quadrant DC/DC converter adjusts a current flowing through the battery pack to a set value.

First claim

What is claimed is:

1 . An energy storage module, comprising:
a capacitor; a bus connection part comprising a positive bus connection terminal and a negative bus connection terminal; a first battery pack electrically coupled between the positive bus connection terminal and the negative bus connection terminal, wherein the first battery pack comprises a battery positive terminal and a battery negative terminal; and a series compensation DC conversion device comprising a first conduction terminal, a second conduction terminal, a bidirectional isolation-type converter and a four-quadrant DC/DC converter, wherein the first conduction terminal comprises a first positive terminal and a first negative terminal, and the second conduction terminal comprises a second positive terminal and a second negative terminal, wherein the first positive terminal and the first negative terminal are respectively connected with the positive bus connection terminal and the negative bus connection terminal, or the first positive terminal and the first negative terminal are respectively connected with the battery positive terminal and the battery negative terminal, wherein the second positive terminal and the second negative terminal are respectively connected with two terminals of the capacitor, the bidirectional isolation-type converter is electrically connected with the first conduction terminal, and the four-quadrant DC/DC converter is electrically connected between the bidirectional isolation-type converter and the second conduction terminal, wherein the four-quadrant DC/DC converter controls the capacitor to generate a compensation voltage to compensate a voltage between the battery positive terminal and the battery negative terminal of the first battery pack, or the four-quadrant DC/DC converter adjusts a current flowing through the first battery pack to a set value; wherein the capacitor electrically coupled between the positive bus connection terminal and the battery positive terminal, or electrically coupled between the negative bus connection terminal and the battery negative terminal.

2 . The energy storage module according to claim 1 , wherein the first conduction terminal of the series compensation DC conversion device is a high voltage side of the series compensation DC conversion device, and the second conduction terminal of the series compensation DC conversion device is a low voltage side of the series compensation DC conversion device.

3 . The energy storage module according to claim 1 , wherein the capacitor is electrically connected between the positive bus connection terminal and the battery positive terminal, the first positive terminal of the first conduction terminal is electrically connected with the battery positive terminal, and the first negative terminal of the first conduction terminal is electrically connected with the battery negative terminal.

4 . The energy storage module according to claim 3 , wherein a current flowing through the first conduction terminal and a current flowing through the second conduction terminal are controlled by the four-quadrant DC/DC converter, so that the current flowing through the first battery pack is adjusted to the set value.

5 . The energy storage module according to claim 3 , wherein the series compensation DC conversion device further comprises a control unit, and the control unit is electrically connected with the four-quadrant DC/DC converter, wherein the control unit comprises a first ramp controller, a first comparator, a first proportional controller, a first amplitude limiter, a selector, a second comparator, a second proportional controller and a second amplitude limiter, wherein if the energy storage module is operated in a constant voltage mode, the first ramp controller receives a voltage command and converts the voltage command into a voltage ramp given value, the first comparator compares the voltage ramp given value with the compensation voltage and generates an error voltage, the first proportional controller generates a given current according to the error voltage, the first amplitude limiter limits an amplitude of the given current, and the selector receives the limited given current from the first amplitude limiter, the second comparator compares a current flowing through the first conduction terminal, a current flowing through the second conduction terminal with the limited given current and generates a comparison current, wherein the second proportional controller receives and calculates the comparison current, and the second amplitude limiter limits an amplitude of the calculated comparison current from the second proportional controller, so that a duty cycle is obtained, wherein on/off states of at least one switch in the four-quadrant DC/DC converter are controlled according to the duty cycle.

6 . The energy storage module according to claim 3 , wherein the series compensation DC conversion device further comprises a control unit, and the control unit is electrically connected with the four-quadrant DC/DC converter, wherein the control unit comprises a second ramp controller, a selector, a second comparator, a second proportional controller and a second amplitude limiter, wherein when if the energy storage module is operated in a constant current mode, the second ramp controller receives a current command and converts the voltage command into a current ramp given value, and the selector receives the current ramp given value from the second ramp controller, the second comparator compares a current flowing through the first conduction terminal, a current flowing the second conduction terminal with the current ramp given value and generates a comparison current, wherein the second proportional controller receives and calculates the comparison current, and the second amplitude limiter limits an amplitude of the calculated comparison current from the second proportional controller, so that a duty cycle is obtained, wherein on/off states of at least one switch in the four-quadrant DC/DC converter are controlled according to the duty cycle.

7 . The energy storage module according to claim 1 , wherein the capacitor is electrically connected between the positive bus connection terminal and the battery positive terminal, the first positive terminal of the first conduction terminal is electrically connected with the positive bus connection terminal, and the first negative terminal of the first conduction terminal is electrically connected with the negative bus connection terminal.

8 . The energy storage module according to claim 7 , wherein a current flowing through the second conduction terminal is controlled by the four-quadrant DC/DC converter, so that the current flowing through the first battery pack is adjusted to the set value.

9 . The energy storage module according to claim 7 , wherein the series compensation DC conversion device further comprises a control unit, and the control unit is electrically connected with the four-quadrant DC/DC converter, wherein the control unit comprises a first ramp controller, a first comparator, a first proportional controller, a first amplitude limiter, a selector, a second comparator, a second proportional controller and a second amplitude limiter, wherein if the energy storage module is operated in a constant voltage mode, the first ramp controller receives a voltage command and converts the voltage command into a voltage ramp given value, the first comparator compares the voltage ramp given value with the compensation voltage and generates an error voltage, the first proportional controller generates a given current according to the error voltage, the first amplitude limiter limits an amplitude of the given current, and the selector receives the

Assignees

• Delta Electronics Shanghai Co

Inventors

• Zhang Tengshen
• Zhang Jinfa
• Zhong Linfeng
• Wang Changyong
• Wang Yafeng

Classifications

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H02J7/94 Primary

  in response to battery current · CPC title

• H02J7/60 Primary

  including safety or protection arrangements · CPC title

• H02M3/33584

  Bidirectional converters · CPC title

• H02M3/07

  using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps} · CPC title