CN108110850B - Series load isolation type battery grouping system and control method - Google Patents

Series load isolation type battery grouping system and control method Download PDF

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Publication number
CN108110850B
CN108110850B CN201810031863.3A CN201810031863A CN108110850B CN 108110850 B CN108110850 B CN 108110850B CN 201810031863 A CN201810031863 A CN 201810031863A CN 108110850 B CN108110850 B CN 108110850B
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China
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power
energy
module
energy storage
switch
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CN108110850A (en
Inventor
朱智富
李圆圆
张翼
孙鹏
李水根
陈冲
臧政
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Qingdao University
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Qingdao University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially

Abstract

The invention discloses a series load isolation type battery grouping system and a control method; the problem of high-rate charge and discharge of the energy storage type battery module is solved; the system comprises at least one energy storage energy module and at least one power energy module, wherein all the energy storage energy modules and the power energy modules are connected in series and then connected with a load or a charging device; all the energy storage energy modules and the power energy modules are communicated with a main controller through communication lines, and the main controller controls the on-off of switches in the energy storage energy modules and the power energy modules; the energy density of the energy storage energy module is greater than that of the power energy module; the power density of the energy storage energy module is less than the power density of the power energy module. The energy storage battery works within a certain small power output range, and the condition that the output power of the battery in the traditional battery grouping scheme is changed along with the working condition is avoided.

Description

Series load isolation type battery grouping system and control method
Technical Field
The invention relates to the technical field of energy storage and discharge, in particular to a series load isolation type battery grouping system and a control method.
Background
Some batteries can be charged and discharged at high rates but with relatively low energy densities, while some have higher energy densities but with relatively low charge and discharge rates. The energy storage type battery can bear larger charging and discharging current under the condition that the battery needs larger power output, which brings the problems of temperature rise, service life reduction and the like to the energy storage type battery.
Disclosure of Invention
The present invention is directed to solve the above problems, and an object of the present invention is to provide a series load isolation type battery grouping system and a control method thereof, in which two or more batteries are used, and excess charge and discharge power is borne by a power battery with a high charge and discharge rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a series load isolation type battery grouping system comprises at least one energy storage energy module and at least one power energy module, wherein all the energy storage energy modules and the power energy modules are connected in series and then connected with a load or a charging device;
all the energy storage energy modules and the power energy modules are communicated with a main controller through communication lines, and the main controller controls the on-off of switches in the energy storage energy modules and the power energy modules;
the energy density of the energy storage energy module is greater than that of the power energy module; the power density of the energy storage energy module is less than the power density of the power energy module.
The energy storage energy module comprises an energy storage type battery module and an energy storage DC/DC circuit, the output of the energy storage type battery module is connected with the energy storage DC/DC circuit, and the outputs of all the energy storage DC/DC circuits are connected in series.
The power energy module comprises a power battery module and a power DC/DC circuit, the output of the power battery module is connected with the power DC/DC circuit, and the outputs of all the power DC/DC circuits are connected in series.
The energy storage type battery module comprises a plurality of single batteries which are connected in parallel and/or in series.
The power type battery module comprises a plurality of single batteries which are connected in parallel and/or in series.
The power DC/DC circuit comprises a negative electrode of the power battery module, a negative electrode of the power battery module is connected with one end of a switch tube S1, the other end of the switch tube S1 is simultaneously connected with one end of an inductor L and one end of a switch tube S2, the other end of a switch tube S2 is connected with one end of a reverse switch K11 and one end of a forward switch K21, the other end of a forward switch K21 is simultaneously connected with one end of an output capacitor and one end of a reverse switch K12, the other end of the reverse switch K11 is simultaneously connected with the other end of the output capacitor and one end of a forward switch K22, and the other end of the reverse switch K12 and the other end of the forward switch K22 are simultaneously connected with a positive electrode of; the switch tube S1 and the switch tube S2 are both connected to the master controller.
When the system discharges, the forward switches K21 and K22 are closed, the reverse switches K11 and K12 are turned off, and the power energy module realizes two modes of discharging or exiting the system; the forward switches K21 and K22 are turned off, the reverse switches K11 and K12 are turned on, and the power energy module realizes two modes of charging or exiting the system.
When the system is charged, the forward switches K21 and K22 are closed, the reverse switches K11 and K12 are turned off, and the power energy module realizes two modes of charging or exiting the system; the forward switches K21 and K22 are turned off, the reverse switches K11 and K12 are turned on, and the power energy module realizes two modes of discharging or exiting the system.
The control method for the series load isolation type battery grouping system comprises the following steps: when the system needs low-power output, all the output power is output by the energy storage energy module;
when the system needs high-power output, the energy storage energy module outputs the maximum power, and the power energy module outputs the rest power;
when the system needs low-power input, the energy storage energy module absorbs all power;
when the system requires high power input, the energy storage energy module absorbs energy at maximum power, and the power energy module absorbs the rest power.
The invention has the beneficial effects that:
the energy storage battery works within a certain small power output range, and the condition that the output power of the battery in the traditional battery grouping scheme is changed along with the working condition is avoided.
The power battery with the same quality can release power which is several times higher than that of the energy storage battery, namely, under the condition of the same battery quality, the peak output and the input power can be obviously improved compared with the traditional battery grouping scheme.
Because the working power of the energy storage battery is in a reasonable range, the service life of the energy storage battery is obviously prolonged.
Drawings
FIG. 1 is an overall block diagram of the present invention;
FIG. 2 is a schematic diagram of the discharge operation of the present invention;
FIG. 3 is a schematic diagram illustrating the charging operation of the present invention;
FIG. 4 is a schematic diagram illustrating the discharge operation of the present embodiment;
fig. 5 is a schematic diagram of the charging operation principle of the present embodiment.
The energy storage device comprises an energy storage energy module 1, a power energy module 2, a power type battery module 3, a main controller 4, a power DC/DC circuit 5, a communication circuit 6, an energy storage DC/DC circuit 7 and an energy storage type battery module 8.
Detailed Description
The invention is further described with reference to the following figures and examples.
1-3, a series load isolation type battery grouping system comprises a plurality of energy storage energy modules 1 and a plurality of power energy modules 2, wherein all the energy storage energy modules 1 and the power energy modules 2 are connected in series and then connected with a load or a charging device;
all the energy storage energy modules 1 and the power energy modules 2 are communicated with a main controller 4 through communication lines 6, and the main controller 4 controls the on-off of switches in the energy storage energy modules 1 and the power energy modules 2;
the energy density of the energy storage energy module 1 is greater than that of the power energy module 2; the power density of the energy storage energy module 1 is smaller than that of the power energy module 2.
The energy storage energy module 1 comprises an energy storage type battery module 8 and an energy storage DC/DC circuit 7, wherein the output of the energy storage type battery module 8 is connected with the energy storage DC/DC circuit 7, and the outputs of all the energy storage DC/DC circuits 7 are connected in series.
The power energy module comprises a power battery module 3 and a power DC/DC circuit 5, wherein the output of the power battery module 3 is connected with the power DC/DC circuit 5, and the outputs of all the power DC/DC circuits 5 are connected in series.
The energy storage type battery module comprises a plurality of single batteries which are connected in parallel and/or in series.
The power type battery module comprises a plurality of single batteries which are connected in parallel and/or in series.
All the single batteries in the battery module adopt a parallel connection mode, so that the requirement on the consistency of the batteries can be reduced.
The difference between the energy storage type battery module and the power type battery module is that the former has a large energy density and the latter has a large power density.
The structure of the invention is that batteries are connected in parallel to form a battery module, the battery module inputs DC/DC to form an energy module, and the DC/DC output ends are connected in series to form a high-voltage system. Wherein the DC/DC can be controlled to output power and whether to short circuit. The energy module composed of the energy storage type battery module and the DC/DC is called an energy storage energy module 1, the energy module composed of the dynamic battery module and the DC/DC is called a dynamic energy module 2, and the two modules are connected in series in the whole system.
The energy storage DC/DC circuit can adopt a circuit structure introduced in a lithium battery charging and discharging control circuit; the power DC/DC circuit can reversely charge the power battery under the condition that the direction of system current in the series system is not changed.
As shown in fig. 2-3, the power DC/DC circuit includes a negative electrode of the power battery module connected to one end of a switch tube S1 (Sn 1 in the figure), the other end of a switch tube S1 connected to one end of an inductor L and one end of a switch tube S2 (Sn 2 in the figure), the other end of a switch tube S2 connected to one end of a reverse switch K11 and one end of a forward switch K21, the other end of the forward switch K21 connected to one end of an output capacitor and one end of a reverse switch K12, the other end of the reverse switch K11 connected to one end of an output capacitor and one end of a forward switch K22, and the other end of the reverse switch K12 and the other end of the forward switch K22 connected to a positive electrode of the power battery module; the switch tube S1 and the switch tube S2 are both connected to the master controller. The switch tube S1 and the switch tube S2 may be MOS, IGBT, triode, or thyristor, but are not limited to these.
As shown in fig. 4-5, a schematic diagram of the discharging and charging principle of the present embodiment is shown, wherein the switching tubes S1 and S2 are MOS tubes, the power DC/DC circuit, the negative electrode of the power battery module is connected to the source of the MOS tube S1, the drain of the MOS tube S1 is connected to both one end of the inductor L and the source of the MOS tube S2, the drain of the MOS tube S2 is connected to both one end of the reverse switch K11 and one end of the forward switch K21, the other end of the forward switch K21 is connected to both one end of the output capacitor C2 and one end of the reverse switch K12, the other end of the reverse switch K11 is connected to both the other end of the output capacitor C2 and one end of the forward switch K22, the other end of the inductor L is connected to the positive electrode of the power battery module, and the other ends of the reverse switch K12 and the forward switch K22 are connected to the positive electrode of; the gate of MOS transistor S1 and the gate of MOS transistor S2 are both connected to the main controller.
The forward switch and the reverse switch cannot be turned on simultaneously.
As shown in fig. 2, when the system discharges, the forward switches K21 and K22 are closed, the reverse switches K11 and K12 are turned off, and the power energy module realizes two modes of discharging or exiting the system; the forward switches K21 and K22 are turned off, the reverse switches K11 and K12 are turned on, and the power energy module realizes two modes of charging or exiting the system;
as shown in fig. 3, when the system is charged, the forward switches K21 and K22 are closed, the reverse switches K11 and K12 are turned off, and the power energy module realizes two modes of charging or exiting the system; the forward switches K21 and K22 are turned off, the reverse switches K11 and K12 are turned on, and the power energy module realizes two modes of discharging or exiting the system.
The number of the energy storage energy modules and the number of the power energy modules connected in series can be determined according to actual requirements. The number of the energy storage energy modules can be increased or decreased according to the required energy storage energy; the power energy module can increase and decrease the quantity according to the peak output and the absorbed power, and the energy storage size of the power module is determined according to the time length of the output and the absorbed power.
The energy storage DC/DC and the power DC/DC are a DC-DC converter which can be controlled by a master controller and can realize the exit of the battery module and the output power of the battery module. The difference between the energy storage DC/DC and the power DC/DC is that the power DC/DC can realize the conversion capability of larger power.
The load is typically a motor if applied to the vehicle, but typically needs to be controlled via a motor controller. Other (e.g. grid) loads are possible if applied in other situations (e.g. power plants).
The communication line is typically a CAN bus, but other communication protocols (e.g., RS232, RS485, etc.) are also suitable for use in the present invention.
The main controller 4 is a control center of the present invention, and controls the output and energy recovery of the energy storage energy module and the power energy module, controls the exit and entrance of the energy storage energy module and the power energy module, and controls the output and input power of the energy storage energy module and the power energy module.
A method of controlling a series load isolated battery grouping system, comprising:
when the system needs low-power output, all the output power is output by the energy storage energy module;
when the system needs high-power output, the energy storage energy module outputs the maximum power, and the power energy module outputs the rest power;
when the system needs low-power input, the energy storage energy module absorbs all power;
when the system requires high power input, the energy storage energy module absorbs energy at maximum power, and the power energy module absorbs the rest power.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (4)

1. A series load isolation type battery grouping system is characterized by comprising at least one energy storage energy module and at least one power energy module, wherein all the energy storage energy modules and the power energy modules are connected in series and then connected with a load or a charging device;
all the energy storage energy modules and the power energy modules are communicated with a main controller through communication lines, and the main controller controls the on-off of switches in the energy storage energy modules and the power energy modules;
the energy density of the energy storage energy module is greater than that of the power energy module; the power density of the energy storage energy module is smaller than that of the power energy module;
the energy storage energy module comprises an energy storage type battery module and an energy storage DC/DC circuit, the output of the energy storage type battery module is connected with the energy storage DC/DC circuit, and the outputs of all the energy storage DC/DC circuits are connected in series;
the power energy module comprises a power battery module and a power DC/DC circuit, the output of the power battery module is connected with the power DC/DC circuit, and the outputs of all the power DC/DC circuits are connected in series;
the battery module inputs DC/DC to form an energy module, and the DC/DC output ends are connected in series to form a high-voltage system;
the energy storage energy module works in a certain small power output range, and the power energy module outputs the rest power;
the power DC/DC circuit comprises a negative electrode of the power battery module, a negative electrode of the power battery module is connected with one end of a switch tube S1, the other end of the switch tube S1 is simultaneously connected with one end of an inductor L and one end of a switch tube S2, the other end of a switch tube S2 is connected with one end of a reverse switch K11 and one end of a forward switch K21, the other end of a forward switch K21 is simultaneously connected with one end of an output capacitor and one end of a reverse switch K12, the other end of the reverse switch K11 is simultaneously connected with the other end of the output capacitor and one end of a forward switch K22, and the other end of the reverse switch K12 and the other end of the forward switch K22 are simultaneously connected with a positive electrode of; the switch tube S1 and the switch tube S2 are both connected with the main controller;
when the system discharges, the forward switches K21 and K22 are closed, the reverse switches K11 and K12 are turned off, and the power energy module realizes two modes of discharging or exiting the system; the forward switches K21 and K22 are turned off, the reverse switches K11 and K12 are turned on, and the power energy module realizes two modes of charging or exiting the system;
when the system is charged, the forward switches K21 and K22 are closed, the reverse switches K11 and K12 are turned off, and the power energy module realizes two modes of charging or exiting the system; the forward switches K21 and K22 are turned off, the reverse switches K11 and K12 are turned on, and the power energy module realizes two modes of discharging or exiting the system.
2. The series load isolation type battery grouping system as claimed in claim 1, wherein the energy storage type battery module comprises a plurality of unit batteries connected in parallel and/or in series.
3. The series load isolation type battery grouping system as claimed in claim 1, wherein the power type battery module comprises a plurality of unit batteries connected in parallel and/or in series.
4. The method of claim 1 for controlling a series load isolated battery grouping system, comprising: when the system needs low-power output, all the output power is output by the energy storage energy module;
when the system needs high-power output, the energy storage energy module outputs the maximum power, and the power energy module outputs the rest power;
when the system needs low-power input, the energy storage energy module absorbs all power;
when the system requires high power input, the energy storage energy module absorbs energy at maximum power, and the power energy module absorbs the rest power.
CN201810031863.3A 2018-01-12 2018-01-12 Series load isolation type battery grouping system and control method Active CN108110850B (en)

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CN100416912C (en) * 2006-05-31 2008-09-03 陈伟利 Grouping charging and discharging work method for accumulator
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CN102842963B (en) * 2012-09-21 2015-03-18 中国科学院广州能源研究所 Secondary battery and super capacitor mixed energy storage management system
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Publication number Priority date Publication date Assignee Title
JP2003087987A (en) * 2001-09-13 2003-03-20 Mitsubishi Heavy Ind Ltd Charging and discharging circuit for group of series- connected batteries
CN104253469A (en) * 2014-09-24 2014-12-31 于志章 Secondary battery pack charging and discharging management system

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