CN207442455U - A kind of voltage balance circuit for energy-storage system battery module - Google Patents

A kind of voltage balance circuit for energy-storage system battery module Download PDF

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Publication number
CN207442455U
CN207442455U CN201721471749.XU CN201721471749U CN207442455U CN 207442455 U CN207442455 U CN 207442455U CN 201721471749 U CN201721471749 U CN 201721471749U CN 207442455 U CN207442455 U CN 207442455U
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battery
module
relay
battery module
parallel connection
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方振华
吴彬杰
李海军
蔡惠群
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Yinlong New Energy Co Ltd
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Yinlong New Energy Co Ltd
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Abstract

The utility model discloses a kind of voltage balance circuits for energy-storage system battery module, include battery cluster unit, electric voltage equalization unit and the battery management module of at least two access power grids in parallel, main relay K1 is each concatenated between battery cluster unit and power grid, each battery cluster unit is connected by electric voltage equalization unit with positive and negative anodes busbar, and the battery management module is connected to control disconnection and the closure of relay power respectively with main relay K1 and electric voltage equalization unit;The battery management module is connected to gather the information of voltage of battery cluster unit with each battery cluster unit, so, the utility model can be realized in battery cluster quick, efficiently balanced between battery module in each battery module and different clusters, reliability is high, at low cost, cell system voltage uniformity is improved, extends system operation time and service life.

Description

A kind of voltage balance circuit for energy-storage system battery module
Technical field
The utility model belongs to lithium-ion energy storage battery technical field, and in particular to one kind is used for energy-storage system battery module Voltage balance circuit.
Background technology
At present, application of the lithium ion battery in energy storage field is more and more extensive, in large-scale power grid grade energy storage field, energy storage system System is by the battery composition of enormous amount, and for ease of installation and maintenance, battery system uses modularized design, first by several monomers Battery series-parallel connection forms battery module, then is composed in series battery cluster by several battery modules, if dry cell cluster forms battery pile, warp Power grid is output to after crossing energy conversion device PCS.During the use of battery system, due to each single battery self discharge not Unanimously, battery module, battery cluster, battery pile management system at different levels, equal balance system at different levels and PCS circuits can consume battery It is inconsistent to further result in each battery cell voltage for electricity.
In existing energy-storage system, there is corresponding balancer between the single battery of battery module, battery module, but it is existing Have technology be only capable of carrying out the single battery inside battery module it is relatively effective balanced, to battery module, battery cluster, battery pile it Between electric voltage equalization effect it is poor, the poor reliability of balanced device is of high cost;Since portfolio effect is undesirable, it is necessary to battery mould Block, battery cluster and battery pile carry out maintenance off-line, increase maintained equipment and personnel, and safeguard less efficient.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide one kind to be used for energy-storage system battery mould The voltage balance circuit of block.
A kind of voltage balance circuit for energy-storage system battery module provided by the utility model, including at least two Battery cluster unit, electric voltage equalization unit and the battery management module of parallel connection access power grid, between each battery cluster unit and power grid Main relay K1 is concatenated, each battery cluster unit is connected by electric voltage equalization unit with positive and negative anodes busbar, the battery Management module is connected to control disconnection and the closure of relay power respectively with main relay K1 and electric voltage equalization unit;It is described Battery management module is connected to gather the information of voltage of battery cluster unit with each battery cluster unit.
Preferably, each battery cluster unit includes energy converter and at least one battery module, the battery mould The cathode of block and one end of energy converter connect, and the anode of the battery module and the other end of energy converter connect, institute It states and battery cluster total relay K2 and fuse FU1, the electricity is sequentially connected in series between battery module and the other end of energy converter Cluster total relay K2 in pond is connected with battery management module;The positive and negative anodes of at least one battery module connect with electric voltage equalization unit It connects;The battery management module is connected at least one battery module.
Preferably, the electric voltage equalization unit includes anode parallel connection relay K3, cathode parallel connection relay K4;The anode One end of relay K3 in parallel and the anode of battery module connect, other end access anode parallel connection busbar;The cathode parallel connection after One end of electric appliance K4 and the cathode of battery module connect, other end access cathode parallel connection busbar;The battery management module difference It is connected to control with main relay K1, the total relay K2 of battery cluster, the anode parallel connection relay K3, cathode parallel connection relay K4 The disconnection of relay power processed and closure.
Preferably, also it is serially connected with current-limiting resistance RC between battery module relay K3 in parallel with anode;The battery Fuse FU2 is also serially connected between module relay K4 in parallel with cathode.
Preferably, the battery module includes at least one single battery being serially connected.
Preferably, when the battery module sets two or more, each battery module is in sequential series in the same direction, phase Connect in series relay K5, the series relay K5 and battery management module company between adjacent two each battery modules It connects.
Preferably, when the battery cluster unit sets two or more, two neighboring each battery cluster list Stringing cells cluster parallel connection relay K6, the battery cluster parallel connection relay K6 connect with battery management module between the battery module of member It connects.
Compared with prior art, the utility model provides a kind of electric voltage equalization electricity for energy-storage system battery module Road includes battery cluster unit, electric voltage equalization unit and the battery management module of at least two access power grids in parallel, each battery Main relay K1 is concatenated between cluster unit and power grid, each battery cluster unit is female by electric voltage equalization unit and positive and negative anodes Line connects, and the battery management module is connected to control relay power with main relay K1 and electric voltage equalization unit respectively It disconnects and is closed;The battery management module is connected to gather the information of voltage of battery cluster unit with each battery cluster unit, In this way, battery management module control main relay, battery cluster relay disconnect, control battery module anode parallel connection relay and Cathode parallel connection relay is closed, and using the consistent principle of batteries in parallel connection voltage, makes each battery module in parallel balanced, each battery module Using series operation after electric voltage equalization, the utility model can realize in battery cluster battery mould in each battery module and different clusters It is quick between block, efficiently balanced, and equalization scheme reliability is high, at low cost, and each module voltage inside battery pile can be made to reach high Uniformity is spent, improves cell system voltage uniformity, extends system operation time and service life.
Description of the drawings
Fig. 1 is a kind of voltage balance circuit for energy-storage system battery module that the utility model embodiment 1 provides Circuit diagram;
Fig. 2 is a kind of voltage balance circuit for energy-storage system battery module that the utility model embodiment 2 provides Circuit diagram;
Fig. 3 is a kind of voltage balance circuit for energy-storage system battery module that the utility model embodiment 3 provides Circuit diagram.
Reference numeral is as follows:
1 --- battery cluster unit, 2 --- electric voltage equalization unit, 3 --- energy converter, 4 --- battery module, 5 --- Anode parallel connection busbar, 6 --- cathode parallel connection busbar.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, with reference to embodiments, to this Utility model is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain this practicality It is new, it is not used to limit the utility model.
The utility model embodiment 1 provides a kind of voltage balance circuit for energy-storage system battery module, circuit diagram, As shown in Figure 1, it includes battery cluster unit 1, electric voltage equalization unit 2 and the battery management mould of at least two access power grids in parallel Block, concatenates main relay K1 between each battery cluster unit 1 and power grid, each battery cluster unit 1 passes through electric voltage equalization Unit 2 is connected with positive and negative anodes busbar, and the battery management module is connected and is used for main relay K1 and electric voltage equalization unit 2 respectively Control disconnection and the closure of relay power;The battery management module is connected to gather battery with each battery cluster unit 1 The information of voltage of cluster unit 1;
Each battery cluster unit 1 includes energy converter 3 and at least one battery module 4, the battery module 4 Cathode is connected with one end of energy converter 3, and the anode of the battery module 4 is connected with the other end of energy converter 3, described Battery cluster total relay K2 and fuse FU1, the electricity are sequentially connected in series between the other end of battery module 4 and energy converter 3 Cluster total relay K2 in pond is connected with battery management module;The positive and negative anodes of at least one battery module 4 and electric voltage equalization unit 2 Connection;The battery management module is connected at least one battery module 4.
Energy converter (PCS) is a bidirectional converter, and the convert alternating current of power grid is charged the battery for direct current, will The direct current of battery is converted to exchange electricity output to power grid.
Wherein, the electric voltage equalization unit 2 includes anode parallel connection relay K3, cathode parallel connection relay K4;The anode One end of relay K3 in parallel is connected with the anode of battery module 4, other end access anode parallel connection busbar 5;The cathode is in parallel One end of relay K4 is connected with the cathode of battery module 4, other end access cathode parallel connection busbar 6;The battery management module Respectively use is connected with main relay K1, the total relay K2 of battery cluster, the anode parallel connection relay K3, cathode parallel connection relay K4 Disconnection and closure in control relay power.
Battery management module is used to control disconnection and the closure of each relay.
Wherein, also it is serially connected with current-limiting resistance RC between the battery module 4 relay K3 in parallel with anode;The battery mould Fuse FU2 is also serially connected between the relay K4 in parallel with cathode of block 4.
To ensure 4 security of battery module, fuse FU2 is set between each busbar 6 in parallel with cathode of battery module 4; The electric current of moment is closed for limitation anode parallel connection relay K3, current limliting is set between each busbar 5 in parallel with anode of battery module 4 Resistance RC.
Wherein, the battery module 4 includes at least one single battery being serially connected.
Use a kind of method of voltage balance circuit equalizing voltage for energy-storage system battery module for:The battery Management module gathers the information of voltage of each battery cluster unit 1, and judges that the information of voltage of each battery cluster unit 1 is No identical, if the information of voltage of each battery cluster unit 1 is different, the battery management module controls each battery cluster list Member 1 is disconnected with power grid, and then the battery management module controls each battery cluster unit 1 to be closed with electric voltage equalization unit 2, balanced The voltage of each battery cluster unit 1.
The specific implementation process of this method is:The battery management module gathers battery module 4 in each battery cluster unit 1 Information of voltage, and judge whether the information of voltage of the battery module 4 identical, if the voltage letter of the battery module 4 The information of voltage of breath is different, when energy-storage system needs to carry out equilibrium to the battery module 4 in battery cluster unit 1, cell tube first The main relay K1 managed between module control energy converter 3 and power grid is disconnected, and the total relay K2 of battery cluster is then controlled to disconnect; Then battery management module controls anode parallel connection relay K3, the cathode parallel connection relay K4 of each battery module 4 to be closed, this When, the battery module 4 in each battery cluster unit 1 is in parallel connection, completes battery module 4 in each battery cluster unit 1 Electric voltage equalization;After the completion of the electric voltage equalization of battery module 4, first battery management module control battery module 4 anode parallel connection after Electric appliance K3, cathode parallel connection relay K4 are disconnected, and the total relay K2 of battery cluster is then controlled to be closed, finally controls energy converter 3 Main relay K1 between power grid is closed, you can to carry out series operation.
If different in the information of voltage of the information of voltage of the battery module 4, afterwards, further include:The battery management Module judges whether the voltage of battery module 4 in each battery cluster unit 1 is normal, if battery in each battery cluster unit 1 The voltage of module 4 is normal, performs the electricity of the battery management module control electric voltage equalization unit 2 each battery cluster unit 1 in parallel Pond module 4, the voltage of the battery module 4 in balanced each battery cluster unit 1;It is if electric in each battery cluster unit 1 The electric voltage exception of pond module 4, the battery management module control voltage in each battery cluster unit 1 in parallel of electric voltage equalization unit 2 Normal battery module 4.
The battery module 4 is connected with battery management module, and battery management module can be to battery module 4 and battery mould The voltage of single battery in block 4 is detected, if having single battery exception, 4 voltage of battery module to exceed model in battery module 4 Enclose etc. it is abnormal, then the anode parallel connection relay K3 between the battery module 4 busbar 5 in parallel with anode and cathode parallel connection busbar 6 and Cathode parallel connection relay K4 is not closed, and battery management system sends prompting, which can be used manual maintenance, work as battery When having the voltage of single battery, 4 voltage of battery module in module 4 in normal range (NR), then the battery module 4 is closed with anode simultaneously Join the anode parallel connection relay K3 and cathode parallel connection relay K4 between busbar 5 and cathode parallel connection busbar 6, carry out energy-storage system Electric voltage equalization.
The utility model embodiment 2 provides a kind of voltage balance circuit for energy-storage system battery module, circuit diagram, As shown in Fig. 2, it includes battery cluster unit 1, electric voltage equalization unit 2 and the battery management mould of at least two access power grids in parallel Block, concatenates main relay K1 between each battery cluster unit 1 and power grid, each battery cluster unit 1 passes through electric voltage equalization Unit 2 is connected with positive and negative anodes busbar, and the battery management module is connected and is used for main relay K1 and electric voltage equalization unit 2 respectively Control disconnection and the closure of relay power;The battery management module is connected to gather battery with each battery cluster unit 1 The information of voltage of cluster unit 1.
Wherein, each battery cluster unit 1 includes energy converter 3 and at least one battery module 4, the battery mould The cathode of block 4 is connected with one end of energy converter 3, and the anode of the battery module 4 connects with the other end of energy converter 3 It connects, battery cluster total relay K2 and fuse FU1 is sequentially connected in series between the battery module 4 and the other end of energy converter 3, The total relay K2 of battery cluster is connected with battery management module;The positive and negative anodes and voltage of at least one battery module 4 are equal Weighing apparatus unit 2 connects;The battery management module is connected at least one battery module 4.
Energy converter (PCS) is a bidirectional converter, and the convert alternating current of power grid is charged the battery for direct current, will The direct current of battery is converted to exchange electricity output to power grid.
Battery management module is used to control disconnection and the closure of each relay.
Wherein, when the battery module 4 sets two or more, each battery module 4 in sequential series, phase in the same direction Connect in series relay K5, the series relay K5 and battery management module company between adjacent two each battery modules 4 It connects;The positive and negative anodes of each battery module 4 and electric voltage equalization unit 2.
Wherein, the battery module 4 includes at least one single battery being serially connected.
To ensure that battery management module can carry out the voltage of the single battery in battery module 4 and battery module 4 Each battery module 4 is detected to be connected with battery management module.
Wherein, the electric voltage equalization unit 2 includes anode parallel connection relay K3, cathode parallel connection relay K4;The anode One end of relay K3 in parallel is connected with the anode of battery module 4, other end access anode parallel connection busbar 5;The cathode is in parallel One end of relay K4 is connected with the cathode of battery module 4, other end access cathode parallel connection busbar 6;The battery management module Respectively use is connected with main relay K1, the total relay K2 of battery cluster, the anode parallel connection relay K3, cathode parallel connection relay K4 Disconnection and closure in control relay power.
Wherein, also it is serially connected with current-limiting resistance RC between the battery module 4 relay K3 in parallel with anode;The battery mould Fuse FU2 is also serially connected between the relay K4 in parallel with cathode of block 4.
To ensure 4 security of battery module, fuse FU2 is set between each busbar 6 in parallel with cathode of battery module 4; The electric current of moment is closed for limitation anode parallel connection relay K3, current limliting is set between each busbar 5 in parallel with anode of battery module 4 Resistance RC.
Use this kind of for energy-storage system battery module voltage balance circuit carry out electric voltage equalization method for:This When, when battery module 4 described in the circuit includes two or more battery modules 4, the battery management module acquisition The information of voltage of each battery module 4 in each battery cluster unit 1, and judge the information of voltage of each battery module 4 It is whether identical, if the information of voltage of the information of voltage of each battery module 4 is different, the battery management module control master The total relay K2 of relay K1, battery cluster, series relay K5 are disconnected, then the battery management module control electric voltage equalization list Anode parallel connection relay K3, cathode parallel connection relay K4 in member 2 are closed, each electricity of balanced each battery cluster unit 1 The voltage of pond module 4.
The specific implementation process of this method is:The battery management module gathers each battery in each battery cluster unit 1 The information of voltage of module 4, and judge whether the information of voltage of each battery module 4 is identical, if each battery The information of voltage of the information of voltage of module 4 is different, and energy-storage system needs to carry out each battery module 4 in battery cluster unit 1 When balanced, the main relay K1 first between battery management module control energy converter 3 and power grid is disconnected, and then controls battery The total relay K2 of cluster is disconnected, then disconnects the series relay K5 between each battery module 4;Then battery management module control is each Anode parallel connection relay K3, the cathode parallel connection relay K4 of battery module 4 are closed, at this point, each in each battery cluster unit 1 Battery module 4 is in parallel connection, completes the electric voltage equalization of each battery module 4 in each battery cluster unit 1;Battery module 4 Electric voltage equalization after the completion of, the battery management module control anode parallel connection relay K3 of battery module 4, cathode parallel connection relay first Device K4 is disconnected, and the series relay K5 between each battery module 4 is then controlled to be closed, then the total relay K2 of battery cluster is controlled to close It closes, the main relay K1 between energy converter 3 and power grid is finally controlled to be closed, you can to carry out series operation.
Judge whether the information of voltage of each battery module 4 is identical, afterwards, further includes:The battery management module Judge whether the voltage of battery module 4 in each battery cluster unit 1 is normal, if battery module 4 in each battery cluster unit 1 Voltage it is normal, perform each electricity in each battery cluster unit 1 in parallel of battery management module control electric voltage equalization unit 2 Pond module 4, the voltage of each battery module 4 in balanced each battery cluster unit 1;If each battery cluster unit 1 In battery module 4 electric voltage exception, each battery cluster unit 1 in parallel of battery management module control electric voltage equalization unit 2 The middle normal battery module 4 of voltage.
The battery module 4 is connected with battery management module, and battery management module can be to battery module 4 and battery mould The voltage of single battery in block 4 is detected, if having single battery exception, 4 voltage of battery module to exceed model in battery module 4 Enclose etc. it is abnormal, then the anode parallel connection relay K3 between the battery module 4 busbar 5 in parallel with anode and cathode parallel connection busbar 6 and Cathode parallel connection relay K4 is not closed, and battery management system sends prompting, which can be used manual maintenance, work as battery When having the voltage of single battery, 4 voltage of battery module in module 4 in normal range (NR), then the battery module 4 is closed with anode simultaneously Join the anode parallel connection relay K3 and cathode parallel connection relay K4 between busbar 5 and cathode parallel connection busbar 6, carry out energy-storage system Electric voltage equalization.
The utility model embodiment 3 provides a kind of voltage balance circuit for energy-storage system battery module, circuit diagram, As shown in figure 3, it includes battery cluster unit 1, electric voltage equalization unit 2 and the battery management mould of at least two access power grids in parallel Block, concatenates main relay K1 between each battery cluster unit 1 and power grid, each battery cluster unit 1 passes through electric voltage equalization Unit 2 is connected with positive and negative anodes busbar, and the battery management module is connected and is used for main relay K1 and electric voltage equalization unit 2 respectively Control disconnection and the closure of relay power;The battery management module is connected to gather battery with each battery cluster unit 1 The information of voltage of cluster unit 1.
Each battery cluster unit 1 includes energy converter 3 and at least one battery module 4, the battery module 4 Cathode is connected with one end of energy converter 3, and the anode of the battery module 4 is connected with the other end of energy converter 3, described Battery cluster total relay K2 and fuse FU1, the electricity are sequentially connected in series between the other end of battery module 4 and energy converter 3 Cluster total relay K2 in pond is connected with battery management module;The positive and negative anodes of at least one battery module 4 and electric voltage equalization unit 2 Connection;The battery management module is connected at least one battery module 4.
Energy converter (PCS) is a bidirectional converter, and the convert alternating current of power grid is charged the battery for direct current, will The direct current of battery is converted to exchange electricity output to power grid.
Wherein, when the battery cluster unit 1 sets two or more, two neighboring each battery cluster unit Stringing cells cluster parallel connection relay K6 between 1 battery module 4, the battery cluster parallel connection relay K6 connect with battery management module It connects;
Wherein, when battery module 4 sets two or more in each battery cluster unit 1, each battery mould Block 4 is in sequential series in the same direction, and connect in series relay K5 between two neighboring each battery module 4, the series relay K5 is connected with battery management module;The positive and negative anodes of each battery module 4 and electric voltage equalization unit 2.
Wherein, the battery module 4 includes at least one single battery being serially connected.
To ensure that battery management module can carry out the voltage of the single battery in battery module 4 and battery module 4 Each battery module 4 is detected to be connected with battery management module.
Wherein, the electric voltage equalization unit 2 includes anode parallel connection relay K3, cathode parallel connection relay K4;The anode One end of relay K3 in parallel is connected with the anode of battery module 4, other end access anode parallel connection busbar 5;The cathode is in parallel One end of relay K4 is connected with the cathode of battery module 4, other end access cathode parallel connection busbar 6;The battery management module Respectively use is connected with main relay K1, the total relay K2 of battery cluster, the anode parallel connection relay K3, cathode parallel connection relay K4 Disconnection and closure in control relay power.
Battery management module is used to control disconnection and the closure of each relay.
Wherein, also it is serially connected with current-limiting resistance RC between the battery module 4 relay K3 in parallel with anode;The battery mould Fuse FU2 is also serially connected between the relay K4 in parallel with cathode of block 4.
To ensure 4 security of battery module, fuse FU2 is set between each busbar 6 in parallel with cathode of battery module 4; The electric current of moment is closed for limitation anode parallel connection relay K3, current limliting is set between each busbar 5 in parallel with anode of battery module 4 Resistance RC.
Electric voltage equalization is carried out using a kind of voltage balance circuit for energy-storage system battery module as described in Example 3 Method be:In the circuit when the battery cluster unit 1 sets two or more, when each battery cluster unit 1 Battery module 4 include two or more battery modules 4 when;This method is specially:The battery management module acquisition The information of voltage of each battery module 4 in each battery cluster unit 1, and judge the information of voltage of each battery module 4 It is whether identical, if the information of voltage of the information of voltage of each battery module 4 is different, the battery management module control master The total relay K2 of relay K1, battery cluster, series relay K5 are disconnected, then the battery management module control electric voltage equalization list Anode parallel connection relay K3, cathode parallel connection relay K4 in member 2 are closed, each electricity of balanced each battery cluster unit 1 The voltage of pond module 4;The voltage of each battery module 4 of balanced each battery cluster unit 1, afterwards, further includes:The electricity Pond management module control battery cluster parallel connection relay K6 is closed, each battery module 4 in the balanced different battery cluster units 1 Voltage.
The specific implementation process of this method is:The specific implementation process of this method is:The battery management module acquisition is every The information of voltage of each battery module 4 in a battery cluster unit 1, and judge that the information of voltage of each battery module 4 is No identical, if the information of voltage of the information of voltage of each battery module 4 is different, energy-storage system is needed to battery cluster unit When each battery module 4 in 1 carries out equilibrium, first battery management module control energy converter 3 and power grid between master after Electric appliance K1 is disconnected, and the total relay K2 of battery cluster is then controlled to disconnect, then disconnects the series relay K5 between each battery module 4; Then battery management module controls anode parallel connection relay K3, the cathode parallel connection relay K4 of each battery module 4 to be closed, this When, each battery module 4 in each battery cluster unit 1 is in parallel connection, completes each battery in each battery cluster unit 1 The electric voltage equalization of module 4;Afterwards, when energy-storage system needs to carry out balanced to the battery module of battery cluster unit 1 parallel with one another, The battery cluster parallel connection relay K6 being closed between adjacent cell cluster unit 1, at this point, each battery in adjacent cell cluster unit 1 Module 4 is in parallel connection, completes the electric voltage equalization of each battery module 4 in different battery cluster units 1, so that different electricity Voltage between pond cluster unit 1 reaches consistent;After the voltage of balanced each battery cluster unit 1, first, adjacent cell cluster list is controlled Battery cluster parallel connection relay K6 between member 1 is disconnected, the anode parallel connection relay K3 of battery management module control battery module 4, Cathode parallel connection relay K4 is disconnected, and the series relay K5 between each battery module 4 is then controlled to be closed, then controls battery cluster Total relay K2 is closed, and the main relay K1 between energy converter 3 and power grid is finally controlled to be closed, you can to carry out series connection fortune Row.
The battery management module gathers the information of voltage of each battery module 4 in each battery cluster unit 1, and judges Whether the information of voltage of each battery module 4 is identical, afterwards, further includes:The battery management module judges each battery Whether the voltage of each battery module 4 normal in cluster unit 1, if in each battery cluster unit 1 each battery module 4 electricity Positive pressure is normal, performs each battery mould in the battery management module control electric voltage equalization unit 2 each battery cluster unit 1 in parallel Block 4, the voltage of each battery module 4 in balanced each battery cluster unit 1;If in each battery cluster unit 1 The electric voltage exception of battery module 4, the battery management module control electricity in each battery cluster unit 1 in parallel of electric voltage equalization unit 2 Press normal battery module 4.
The battery module 4 is connected with battery management module, and battery management module can be to battery module 4 and battery mould The voltage of single battery in block 4 is detected, if having single battery exception, 4 voltage of battery module to exceed model in battery module 4 Enclose etc. it is abnormal, then the anode parallel connection relay K3 between the battery module 4 busbar 5 in parallel with anode and cathode parallel connection busbar 6 and Cathode parallel connection relay K4 is not closed, and battery management system sends prompting, which can be used manual maintenance, work as battery When having the voltage of single battery, 4 voltage of battery module in module 4 in normal range (NR), then the battery module 4 is closed with anode simultaneously Join the anode parallel connection relay K3 and cathode parallel connection relay K4 between busbar 5 and cathode parallel connection busbar 6, carry out energy-storage system Electric voltage equalization.
In conclusion the utility model provides a kind of voltage balance circuit for energy-storage system battery module, battery Management module control main relay, battery cluster relay disconnect, and control the anode parallel connection relay of battery module and cathode in parallel Relay is closed, and using the consistent principle of batteries in parallel connection voltage, makes each battery module in parallel balanced, each battery module voltages are balanced Afterwards using series operation, the utility model can be realized in battery cluster fast between battery module in each battery module and different clusters Fast, efficient equilibrium, and equalization scheme reliability is high, at low cost, and each module voltage inside battery pile can be made to reach highly consistent Property, cell system voltage uniformity is improved, extends system operation time and service life.
The above is only the preferred embodiment of the utility model, is not intended to limit the protection of the utility model Scope.

Claims (7)

1. a kind of voltage balance circuit for energy-storage system battery module, which is characterized in that it includes at least two and couples Enter battery cluster unit, electric voltage equalization unit and the battery management module of power grid, concatenated between each battery cluster unit and power grid Main relay K1, each battery cluster unit are connected by electric voltage equalization unit with positive and negative anodes busbar, the battery management mould Block is connected to control disconnection and the closure of relay power respectively with main relay K1 and electric voltage equalization unit;The cell tube Reason module is connected to gather the information of voltage of battery cluster unit with each battery cluster unit.
A kind of 2. voltage balance circuit for energy-storage system battery module according to claim 1, which is characterized in that institute Stating each battery cluster unit includes energy converter and at least one battery module, and cathode and the energy of the battery module are converted One end connection of device, the anode of the battery module and the other end of energy converter connect, and the battery module and energy turn The total relay K2 of battery cluster and fuse FU1, the total relay K2 of battery cluster and electricity are sequentially connected in series between the other end of parallel operation Pond management module connection;The positive and negative anodes of at least one battery module are connected with electric voltage equalization unit;The battery management mould Block is connected at least one battery module.
A kind of 3. voltage balance circuit for energy-storage system battery module according to claim 2, which is characterized in that institute Stating electric voltage equalization unit includes anode parallel connection relay K3, cathode parallel connection relay K4;The one of the anode parallel connection relay K3 End is connected with the anode of battery module, other end access anode parallel connection busbar;One end of the cathode parallel connection relay K4 and electricity The cathode connection of pond module, other end access cathode parallel connection busbar;The battery management module respectively with main relay K1, battery The total relay K2 of cluster, the anode parallel connection relay K3, cathode parallel connection relay K4 connections are for controlling the disconnected of relay power Open and close are closed.
A kind of 4. voltage balance circuit for energy-storage system battery module according to claim 3, which is characterized in that institute It states and is also serially connected with current-limiting resistance RC between battery module relay K3 in parallel with anode;Battery module relay in parallel with cathode Fuse FU2 is also serially connected between device K4.
A kind of 5. voltage balance circuit for energy-storage system battery module according to claim 4, which is characterized in that institute Stating battery module includes at least one single battery being serially connected.
6. a kind of voltage balance circuit for energy-storage system battery module according to claim 5, which is characterized in that when When the battery module sets two or more, each battery module is in sequential series in the same direction, two neighboring each electricity Connect in series relay K5 between the module of pond, and the series relay K5 is connected with battery management module.
7. a kind of voltage balance circuit for energy-storage system battery module according to claim 6, which is characterized in that when When the battery cluster unit sets two or more, gone here and there between the battery module of two neighboring each battery cluster unit Battery cluster parallel connection relay K6 is met, the battery cluster parallel connection relay K6 is connected with battery management module.
CN201721471749.XU 2017-11-07 2017-11-07 A kind of voltage balance circuit for energy-storage system battery module Active CN207442455U (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109245319A (en) * 2018-11-13 2019-01-18 山东积成智通新能源有限公司 A kind of retired battery energy storage system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109245319A (en) * 2018-11-13 2019-01-18 山东积成智通新能源有限公司 A kind of retired battery energy storage system and method

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