CN110600819A - Electric quantity balance control system and method of battery system - Google Patents
Electric quantity balance control system and method of battery system Download PDFInfo
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- CN110600819A CN110600819A CN201910884499.XA CN201910884499A CN110600819A CN 110600819 A CN110600819 A CN 110600819A CN 201910884499 A CN201910884499 A CN 201910884499A CN 110600819 A CN110600819 A CN 110600819A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses an electric quantity balance control system and method of a battery system, wherein the battery system comprises a plurality of battery packs, each battery pack corresponds to a battery box for loading, and the balance control system comprises a battery electric quantity acquisition module, a detection module and a controller; the battery electric quantity acquisition module is used for acquiring electric quantity data of each battery pack; the detection module is used for detecting whether the electric quantity difference value of any two battery packs exceeds a first difference threshold value according to the electric quantity data of each battery pack, and if so, the controller is called; the controller is used for controlling the two target battery packs with the electric quantity difference value exceeding the first difference value threshold value to be communicated and balancing the consistency of the electric quantities of the two target battery packs. The electric quantity equalization control system of the battery system can solve the problem of battery equalization in the plug box so as to adapt to the requirement of large-scale lithium battery energy storage, can solve the problem of electric quantity equalization of single batteries in the plug box, only needs one set of circuit, and can greatly reduce the cost of the equalization device.
Description
Technical Field
The invention belongs to the field of battery energy balance control, and particularly relates to an electric quantity balance control system and method of a battery system.
Background
After the battery pack is grouped, due to the difference between battery individuals, when charging is caused, the battery with the minimum capacity is overcharged, and when discharging, the battery with the minimum capacity is easily overdischarged, so that the service life after grouping is far shorter than that of a single battery, and the charge and discharge characteristics of the whole battery group are directly influenced by the performance of the single battery. In the prior art, the capacity of all the batteries can be equalized by adding a DC/DC circuit between the batteries so as to improve the available capacity of the battery pack. However, with the development of energy storage technology, the scale of battery energy storage is larger and larger, a battery module is formed by connecting single batteries or multiple batteries in parallel, the battery module forms a battery box by connecting the batteries in series, and a plurality of battery boxes form a battery cluster product by connecting the batteries in series, so that the battery cluster is charged and discharged outwards. Due to factors such as structural form, system voltage resistance, connection convenience and reliability, battery equalization can be realized only in the battery box hierarchy by adding a DC/DC (bidirectional direct current to direct current power conversion) circuit between batteries, if the capacities of the equalized battery boxes are different greatly, equalization among the battery boxes cannot be further realized, and after the battery clusters discharge outwards, the battery boxes with lower capacities become the bottleneck of the whole battery clusters.
Disclosure of Invention
The invention aims to overcome the defect that the charging and discharging characteristics of the whole battery system are affected due to the fact that electric energy among battery boxes cannot be balanced in the prior art, and provides an electric quantity balance control system and method of the battery system.
The invention solves the technical problems through the following technical scheme:
the electric quantity balance control system of the battery system comprises a plurality of battery packs, each battery pack corresponds to one battery box to be loaded, and the balance control system comprises a battery electric quantity acquisition module, a detection module and a controller;
the battery electric quantity acquisition module is used for acquiring electric quantity data of each battery pack;
the detection module is used for detecting whether the electric quantity difference value of any two battery packs exceeds a first difference threshold value according to the electric quantity data of each battery pack, and if so, the controller is called;
the controller is used for controlling the two target battery packs with the electric quantity difference value exceeding the first difference value threshold value to be communicated and balancing the consistency of the electric quantities of the two target battery packs.
Preferably, the electric quantity equalization control system further comprises a plurality of switch modules and a plurality of power conversion modules;
each battery pack is correspondingly provided with a switch module and a power conversion module, the first end of the switch module is connected with the bus, the second end of the switch module is connected with the first end of the power conversion module, and the second end of the power conversion module is connected with the battery pack;
the detection module is used for calling the controller to generate a first control instruction when detecting that the electric quantity difference value of the two target battery packs exceeds a first difference threshold value;
the controller is used for sending the first control instruction to the switch modules of the two target battery packs;
the switch modules of the two target battery packs are used for controlling the second ends and the first ends of the switch modules of the two target battery packs to be communicated according to the first control instruction and then calling the power conversion module;
and the power conversion module is used for balancing the consistency of the electric quantity of the two target battery packs.
Preferably, each battery pack includes a plurality of unit cells;
the battery electric quantity acquisition module is also used for acquiring the electric quantity data of each single battery in any battery pack;
the detection module is further used for detecting whether the electric quantity difference value of any two single batteries exceeds a second difference threshold value according to the electric quantity data of each single battery, and if yes, the controller is called;
the controller is also used for sequentially controlling and connecting the single batteries with highest electric quantity or lowest electric quantity in any battery pack and balancing the consistency of the electric quantity of each single battery in any battery pack.
Preferably, the electric quantity equalization control system further comprises a plurality of switch matrixes;
each battery pack is correspondingly provided with a switch matrix, the first end of the switch matrix is connected with the second end of the power conversion module, and the second end of the switch matrix and the third end of the switch module are respectively connected with the battery pack;
the detection module is used for calling the controller to generate a second control instruction when detecting that the electric quantity difference value of any two single batteries exceeds a second difference value threshold value;
the controller is used for sending the second control instruction to the switch module of any battery pack and the switch matrix of any battery pack;
the switch module of any battery pack is used for controlling the second end and the third end of the switch module of any battery pack to be communicated according to the second control instruction;
the switch matrix of any battery pack is used for sequentially communicating the power conversion module of any battery pack with the single battery with the highest electric quantity or the lowest electric quantity in any battery pack according to the second control instruction;
the power conversion module of any battery pack is used for balancing the single battery with the highest electric quantity or the lowest electric quantity with the electric quantity of each single battery in any battery pack until the electric quantity of each single battery in any battery pack is consistent.
Preferably, the controller is further configured to invoke the detection module to perform an action of detecting whether the electric quantity difference value of any two battery packs exceeds a first difference threshold value after the electric quantity of each battery cell in any battery pack is consistent.
Preferably, the power conversion module comprises a single bidirectional DC/DC converter or two single-phase DC/DC converters.
An electric quantity balance control method of a battery method is realized by the electric quantity balance control system, and comprises the following steps:
s10, the battery electric quantity obtaining module obtains electric quantity data of each battery pack;
s20, the detection module detects whether the electric quantity difference value of any two battery packs exceeds a first difference threshold value according to the electric quantity data of each battery pack, if yes, the step S30 is executed;
and S30, the controller controls the two target battery packs with the electric quantity difference value exceeding the first difference threshold value to be communicated, and the electric quantities of the two target battery packs are balanced to be consistent.
Preferably, the electric quantity equalization control system further comprises a plurality of switch modules and a plurality of power conversion modules; each battery pack is correspondingly provided with a switch module and a power conversion module, the first end of the switch module is connected with the bus, the second end of the switch module is connected with the first end of the power conversion module, and the second end of the power conversion module is connected with the battery pack;
step S20 specifically includes:
s2011, the detecting module detects whether the electric quantity difference of any two battery packs exceeds a first difference threshold, if yes, then step S2012 is executed;
s2012, the controller generates a first control instruction;
s2013, the controller sends the first control instruction to switch modules of the two target battery packs;
s2014, the switch modules of the two target battery packs control the second ends of the switch modules of the two target battery packs to be communicated with the first ends according to the first control instruction, and then the power conversion module is called;
s2015, the power conversion module balances the electric quantity of the two target battery packs to be consistent.
Preferably, each battery pack includes a plurality of single batteries, and after step S10, the method for controlling power balance further includes:
s11, the battery electric quantity obtaining module obtains electric quantity data of each single battery in any battery pack;
s12, the detection module detects whether the electric quantity difference value of any two single batteries exceeds a second difference threshold value according to the electric quantity data of each single battery, if yes, the step S13 is executed;
and S13, the controller sequentially controls and connects the single batteries with highest electric quantity or lowest electric quantity in any battery pack, and balances the consistency of the electric quantity of each single battery in any battery pack.
Preferably, the electric quantity equalization control system further includes a plurality of switch matrixes, one switch matrix is correspondingly arranged on each battery pack, a first end of each switch matrix is connected with a second end of the power conversion module, and the second end of each switch matrix and a third end of each switch module are respectively connected with the battery pack;
step S11 specifically includes:
s1111, the detecting module detects whether the electric quantity difference of any two single batteries exceeds a second difference threshold, if yes, execute step S1112;
s1112, the controller generates a second control instruction;
s1113, the controller sends the second control instruction to a switch module of any battery pack and a switch matrix of any battery pack;
s1114, the switch module of any battery pack controls the second end and the third end of the switch module of any battery pack to be communicated according to the second control instruction;
s1115, sequentially communicating the power conversion module of any battery pack and the single battery with highest electric quantity or lowest electric quantity in any battery pack through the switch matrix of any battery pack according to the second control instruction;
and S1116, the power conversion module of any battery pack balances the single battery with the highest electric quantity or the lowest electric quantity and the electric quantity of each single battery in any battery pack until the electric quantity of each single battery in any battery pack is consistent.
The positive progress effects of the invention are as follows: the electric quantity equalization control system of the battery system can solve the problem of battery equalization in the plug box so as to adapt to the requirement of large-scale lithium battery energy storage, can solve the problem of electric quantity equalization of single batteries in the plug box, only needs one set of circuit, and can greatly reduce the cost of the equalization device.
Drawings
Fig. 1 is a schematic block diagram of a power balance control system of a battery system according to embodiment 1 of the present invention.
Fig. 2 is a schematic view of a partial structure of an electric quantity balance control system of a battery system according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a switch module in the electric quantity balancing control system of the battery system according to embodiment 1 of the present invention.
Fig. 4 is a schematic block diagram of a power balance control system of a battery system according to embodiment 2 of the present invention.
Fig. 5 is a schematic circuit diagram of a part of example 2 in embodiment 2 of the present invention.
Fig. 6 is a flowchart of a method for controlling power balance of a battery system according to embodiment 3 of the present invention.
Fig. 7 is a flowchart of step S20 in the method for controlling power balance of a battery system according to embodiment 3 of the present invention.
Fig. 8 is a flowchart of a method for controlling power balance of a battery system according to embodiment 4 of the present invention.
Fig. 9 is a flowchart of step S11 in the method for controlling power balance of a battery system according to embodiment 4 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
An electric quantity balance control system of a battery system comprises a plurality of battery packs 1, wherein each battery pack 1 corresponds to a battery box for loading, as shown in fig. 1, the balance control system comprises a battery electric quantity acquisition module 2, a detection module 3 and a controller 4;
the battery electric quantity obtaining module 2 is used for obtaining electric quantity data of each battery pack 1;
the detection module 3 is configured to detect whether an electric quantity difference value of any two battery packs exceeds a first difference threshold according to the electric quantity data of each battery pack 1, and if so, invoke the controller 4;
the controller 4 is configured to control the two target battery packs whose electric quantity difference exceeds the first difference threshold to communicate with each other, and balance that the electric quantities of the two target battery packs are the same.
In this embodiment, referring to fig. 1, the electric quantity balancing control system further includes a plurality of switch modules 5 and a plurality of power conversion modules 6; the power conversion module 6 comprises a single bidirectional DC/DC converter or two single-phase DC/DC converters, and the power conversion module 6 can realize bidirectional energy flow transmission.
Each battery pack 1 is correspondingly provided with a switch module 5 (comprising a negative switch S1 and a positive switch S2) and a power conversion module 6, the first ends (A1 and A2) of the switch module 5 are connected with a bus 9, the second ends (B1 and B2) of the switch module 5 are connected with the first end D1 of the power conversion module 6, and the second end D2 of the power conversion module 6 is connected with the battery pack 1;
the detection module 3 is configured to invoke the controller 4 to generate a first control instruction when detecting that the electric quantity difference value of the two target battery packs exceeds a first difference threshold value;
the controller 4 is configured to send the first control instruction to the switch modules 5 of the two target battery packs;
the switch modules 5 of the two target battery packs are used for controlling the second ends (B1 and B2) of the switch modules 5 of the two target battery packs to be communicated with the first ends (A1 and A2) according to the first control command and then calling the power conversion module 6;
and the power conversion module 6 is used for balancing the consistency of the electric quantities of the two target battery packs.
It should be noted that, when the electric quantity of the battery system is actually equalized, the electric quantity of the single batteries in the battery box may be equalized first, and then the energy equalization processing is performed on the battery pack in units of the battery box.
The scheme of the present embodiment is further explained by taking a specific example 1:
example 1: the detection module 3 detects that the electric quantity difference between the battery packs in the battery box 01 and the battery box 02 exceeds a first difference threshold, and the electric quantity of the battery pack in the battery box 01 is lower than the electric quantity of the battery pack in the battery box 02 (the electric quantity of the single battery 01-1 in the battery box 01 is 1 unit, the electric quantities of other single batteries in the battery box 01 are 2 units, the electric quantity of the single battery 02-1 in the battery box 02 is 3 units, and the electric quantities of other single batteries in the battery box 02 are 2 units).
Referring to fig. 2-3, the second ends (B1 and B2) of the switch modules 5 (including the negative switch S1 and the positive switch S2) of the battery box 01 and the battery box 02 are controlled to be switched and connected to the first ends (a1 and a2) to be communicated with the positive electrode and the negative electrode of the bus 9, so that the battery groups of the battery box 01 and the battery box 02 are communicated;
then, the power conversion module 6 (such as a DC/DC converter) of the battery box 01 is controlled to move energy from the second end D2 of the DC/DC converter to the first end D1; the power conversion module 6 (such as a DC/DC converter) of the battery box 02 is controlled to move energy from the first end D1 to the second end D2 of the DC/DC converter, so that the electric quantity of the battery cell 01-1 in the battery box 01 is charged from 1 to 2, the electric quantity of the battery cell 02-1 in the battery box 02 is discharged from 3 to 2, and finally, the electric quantities of each battery cell in the battery packs in the two battery boxes are consistent.
In this embodiment, the balanced control system of electric quantity can solve the balanced problem of the interior battery of subrack to adapt to extensive lithium cell energy storage demand.
Example 2
The electric quantity balance control system of the battery system of the present embodiment is a further improvement on the basis of embodiment 1, as shown in fig. 4, each battery pack 1 includes a plurality of single batteries 7;
the battery electric quantity obtaining module 2 is further configured to obtain electric quantity data of each single battery 7 in any battery pack;
the detection module 3 is further configured to detect whether the electric quantity difference value of any two single batteries exceeds a second difference threshold value according to the electric quantity data of each single battery 7, and if yes, the controller 4 is called;
the controller 4 is further configured to sequentially control and connect the single batteries with the highest electric quantity or the lowest electric quantity in any battery pack, and balance that the electric quantity of each single battery in any battery pack is consistent.
In this embodiment, referring to fig. 4, the electric quantity balancing control system further includes a plurality of switch matrixes 8;
each battery pack is correspondingly provided with a switch matrix 8, the first end of each switch matrix 8 is connected with the second end of the power conversion module 6, and the second end of each switch matrix 8 and the third end of each switch module 5 are respectively connected with the battery pack 1;
the detection module 3 is configured to invoke the controller 4 to generate a second control instruction when detecting that the electric quantity difference value of any two single batteries exceeds a second difference threshold value;
the controller 4 is configured to send the second control instruction to the switch module 5 of any battery pack and the switch matrix 8 of any battery pack;
the switch module 5 of any battery pack is used for controlling the second end and the third end of the switch module 5 of any battery pack to be communicated according to the second control instruction;
the switch matrix 8 of any battery pack is used for sequentially communicating the power conversion module 6 of any battery pack with the single battery with the highest electric quantity or the lowest electric quantity in any battery pack according to the second control instruction;
the power conversion module 6 of any battery pack is used for balancing the single battery with the highest electric quantity or the lowest electric quantity with the electric quantity of each single battery 7 in any battery pack until the electric quantity of each single battery 7 in any battery pack is consistent.
The controller 4 is further configured to invoke the detection module 3 to execute an action of detecting whether the electric quantity difference value of any two battery packs exceeds a first difference threshold value after the electric quantity of each single battery in any battery pack is consistent.
The scheme of the present embodiment is further illustrated by taking example 2:
example 2: the detection module 3 detects 4 single batteries 001 and 004 in the battery box 01, and the electric quantity of each single battery is 5, 5 and 1 unit respectively.
Referring to fig. 2-3, the second terminals (B1 and B2) of the switch module 5 (including the negative switch S1 and the positive switch S2) of the battery box 01 are controlled to be connected to the third terminals (C1 and C2) in a switching manner to be communicated with the switch matrix 8, then the switch matrix is used for communicating the No. 004 battery with the lowest electric quantity, and the circuit is shown in fig. 5 after the communication;
then, the power conversion module 6 (such as a DC/DC converter) of the battery box 01 is controlled, the electric quantity is moved from the whole battery pack to the single battery 004 through the DC/DC converter, each single battery in the battery pack can discharge 1 unit of energy, the discharged energy is charged to the single battery 004, and finally, the electric quantities of the single batteries 001 and 004 are all changed into 4 units, that is, the electric quantities of the single batteries are consistent.
In this embodiment, the problem of battery equalization in the plug-in box can be solved while the problem of electric quantity equalization of the single batteries in the plug-in box can be solved, only one set of circuit is needed, and the cost of the equalization device can be greatly reduced.
Example 3
An electric quantity balance control method of a battery method, as shown in fig. 6, is implemented by using the electric quantity balance control system according to embodiment 1 or 2, and includes:
s10, the battery electric quantity obtaining module obtains the electric quantity data of each battery pack;
s20, the detection module detects whether the electric quantity difference value of any two battery packs exceeds a first difference threshold value according to the electric quantity data of each battery pack, if yes, the step S30 is executed;
and S30, the controller controls the two target battery packs with the electric quantity difference exceeding the first difference threshold value to be communicated, and the electric quantities of the two target battery packs are balanced to be consistent.
In this embodiment, the electric quantity balancing control method further includes a plurality of switch modules and a plurality of power conversion modules, each battery pack is correspondingly provided with one switch module and one power conversion module, a first end of each switch module is connected with the bus, a second end of each switch module is connected with a first end of each power conversion module, and a second end of each power conversion module is connected with the battery pack; the power conversion module comprises a single bidirectional DC/DC converter or two single-phase DC/DC converters, and the power conversion module can realize bidirectional energy flow transmission.
As shown in fig. 7, step S20 specifically includes:
s2011, the detecting module detects whether the electric quantity difference of any two battery packs exceeds a first difference threshold, if yes, then step S2012 is executed;
s2012, the controller generates a first control instruction;
s2013, the controller sends the first control instruction to the switch modules of the two target battery packs;
s2014, the switch modules of the two target battery packs control the second ends of the switch modules of the two target battery packs to be communicated with the first ends according to the first control instruction, and then the power conversion module is called;
s2015, the power conversion module balances the electric quantity of the two target battery packs to be consistent.
It should be noted that, when the electric quantity of the battery system is actually equalized, the electric quantity of the single batteries in the battery box may be equalized first, and then the energy equalization processing is performed on the battery pack in units of the battery box.
In this embodiment, the balanced control system of electric quantity can solve the balanced problem of the interior battery of subrack to adapt to extensive lithium cell energy storage demand.
Example 4
The method for controlling power balance of the battery method according to this embodiment is further improved on the basis of embodiment 3, each battery pack includes a plurality of single batteries, the method for controlling power balance further includes a detection module, as shown in fig. 8, and after step S10, the method for controlling power balance further includes:
s11, the battery electric quantity obtaining module obtains the electric quantity data of each single battery in any battery pack;
s12, the detection module detects whether the electric quantity difference value of any two single batteries exceeds a second difference threshold value according to the electric quantity data of each single battery, if yes, the step S13 is executed;
and S13, the controller sequentially controls and connects the single batteries with highest electric quantity or lowest electric quantity in any battery pack, and balances the electric quantity consistency of each single battery in any battery pack.
In this embodiment, the electric quantity balancing control system further includes a plurality of switch matrixes, each battery pack is correspondingly provided with one switch matrix, a first end of each switch matrix is connected with a second end of the power conversion module, and the second end of each switch matrix and a third end of each switch module are respectively connected with the battery pack;
as shown in fig. 9, step S11 specifically includes:
s1111, the detection module detects whether the electric quantity difference value of any two single batteries exceeds a second difference threshold value, if yes, the step S1112 is executed;
s1112, the controller generates a second control instruction;
s1113, the controller sends the second control instruction to a switch module of any battery pack and a switch matrix of any battery pack;
s1114, the switch module of any battery pack controls the second end and the third end of the switch module of any battery pack to be communicated according to a second control instruction;
s1115, sequentially communicating the power conversion module of any battery pack and the single battery with highest electric quantity or lowest electric quantity in any battery pack through the switch matrix of any battery pack according to a second control instruction;
and S1116, balancing the single battery with the highest electric quantity or the lowest electric quantity with the electric quantity of each single battery in any battery pack by the power conversion module of any battery pack until the electric quantity of each single battery in any battery pack is consistent.
In this embodiment, the problem of battery equalization in the plug-in box can be solved while the problem of electric quantity equalization of the single batteries in the plug-in box can be solved, only one set of circuit is needed, and the cost of the equalization device can be greatly reduced.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The electric quantity balance control system of the battery system comprises a plurality of battery packs, and each battery pack corresponds to a battery box for loading, and is characterized by comprising a battery electric quantity acquisition module, a detection module and a controller;
the battery electric quantity acquisition module is used for acquiring electric quantity data of each battery pack;
the detection module is used for detecting whether the electric quantity difference value of any two battery packs exceeds a first difference threshold value according to the electric quantity data of each battery pack, and if so, the controller is called;
the controller is used for controlling the two target battery packs with the electric quantity difference value exceeding the first difference value threshold value to be communicated and balancing the consistency of the electric quantities of the two target battery packs.
2. The system for controlling power balance of a battery system according to claim 1, wherein the system for controlling power balance further comprises a plurality of switch modules and a plurality of power conversion modules;
each battery pack is correspondingly provided with a switch module and a power conversion module, the first end of the switch module is connected with the bus, the second end of the switch module is connected with the first end of the power conversion module, and the second end of the power conversion module is connected with the battery pack;
the detection module is used for calling the controller to generate a first control instruction when detecting that the electric quantity difference value of the two target battery packs exceeds a first difference threshold value;
the controller is used for sending the first control instruction to the switch modules of the two target battery packs;
the switch modules of the two target battery packs are used for controlling the second ends and the first ends of the switch modules of the two target battery packs to be communicated according to the first control instruction and then calling the power conversion module;
and the power conversion module is used for balancing the consistency of the electric quantity of the two target battery packs.
3. The system for controlling equalization of electric power of a battery system according to claim 2, wherein each battery pack includes a plurality of unit batteries;
the battery electric quantity acquisition module is also used for acquiring the electric quantity data of each single battery in any battery pack;
the detection module is further used for detecting whether the electric quantity difference value of any two single batteries exceeds a second difference threshold value according to the electric quantity data of each single battery, and if yes, the controller is called;
the controller is also used for sequentially controlling and connecting the single batteries with highest electric quantity or lowest electric quantity in any battery pack and balancing the consistency of the electric quantity of each single battery in any battery pack.
4. The system for controlling battery equalization of a battery system of claim 3, wherein the system for controlling battery equalization further comprises a plurality of switch matrices;
each battery pack is correspondingly provided with a switch matrix, the first end of the switch matrix is connected with the second end of the power conversion module, and the second end of the switch matrix and the third end of the switch module are respectively connected with the battery pack;
the detection module is used for calling the controller to generate a second control instruction when detecting that the electric quantity difference value of any two single batteries exceeds a second difference value threshold value;
the controller is used for sending the second control instruction to the switch module of any battery pack and the switch matrix of any battery pack;
the switch module of any battery pack is used for controlling the second end and the third end of the switch module of any battery pack to be communicated according to the second control instruction;
the switch matrix of any battery pack is used for sequentially communicating the power conversion module of any battery pack with the single battery with the highest electric quantity or the lowest electric quantity in any battery pack according to the second control instruction;
the power conversion module of any battery pack is used for balancing the single battery with the highest electric quantity or the lowest electric quantity with the electric quantity of each single battery in any battery pack until the electric quantity of each single battery in any battery pack is consistent.
5. The system for controlling power balance of a battery system according to claim 4, wherein the controller is further configured to invoke the detection module to perform an action of detecting whether the power difference between any two battery packs exceeds the first difference threshold after the power of each battery in any battery pack is consistent.
6. The system for controlling battery equalization of a battery system of claim 2, wherein the power conversion module comprises a single bidirectional DC/DC converter or two single-phase DC/DC converters.
7. An electric quantity balance control method of a battery method, wherein the balance control method is implemented by using the electric quantity balance control system according to any one of claims 1 to 6, and the electric quantity balance control method comprises the following steps:
s10, the battery electric quantity obtaining module obtains electric quantity data of each battery pack;
s20, the detection module detects whether the electric quantity difference value of any two battery packs exceeds a first difference threshold value according to the electric quantity data of each battery pack, if yes, the step S30 is executed;
and S30, the controller controls the two target battery packs with the electric quantity difference value exceeding the first difference threshold value to be communicated, and the electric quantities of the two target battery packs are balanced to be consistent.
8. The method for controlling battery power balance of claim 7, wherein the system for controlling battery power balance further comprises a plurality of switch modules and a plurality of power conversion modules; each battery pack is correspondingly provided with a switch module and a power conversion module, the first end of the switch module is connected with the bus, the second end of the switch module is connected with the first end of the power conversion module, and the second end of the power conversion module is connected with the battery pack;
step S20 specifically includes:
s2011, the detecting module detects whether the electric quantity difference of any two battery packs exceeds a first difference threshold, if yes, then step S2012 is executed;
s2012, the controller generates a first control instruction;
s2013, the controller sends the first control instruction to switch modules of the two target battery packs;
s2014, the switch modules of the two target battery packs control the second ends of the switch modules of the two target battery packs to be communicated with the first ends according to the first control instruction, and then the power conversion module is called;
s2015, the power conversion module balances the electric quantity of the two target battery packs to be consistent.
9. The method for controlling power balance of a battery method according to claim 8, wherein each battery pack includes a plurality of unit batteries, and after step S10, the method further includes:
s11, the battery electric quantity obtaining module obtains electric quantity data of each single battery in any battery pack;
s12, the detection module detects whether the electric quantity difference value of any two single batteries exceeds a second difference threshold value according to the electric quantity data of each single battery, if yes, the step S13 is executed;
and S13, the controller sequentially controls and connects the single batteries with highest electric quantity or lowest electric quantity in any battery pack, and balances the consistency of the electric quantity of each single battery in any battery pack.
10. The method for controlling electric quantity equalization of a battery method according to claim 9, wherein the system for controlling electric quantity equalization further comprises a plurality of switch matrixes, one switch matrix is correspondingly arranged for each battery pack, a first end of each switch matrix is connected with a second end of the power conversion module, and the second end of each switch matrix and a third end of each switch module are respectively connected with the battery pack;
step S11 specifically includes:
s1111, the detecting module detects whether the electric quantity difference of any two single batteries exceeds a second difference threshold, if yes, execute step S1112;
s1112, the controller generates a second control instruction;
s1113, the controller sends the second control instruction to a switch module of any battery pack and a switch matrix of any battery pack;
s1114, the switch module of any battery pack controls the second end and the third end of the switch module of any battery pack to be communicated according to the second control instruction;
s1115, sequentially communicating the power conversion module of any battery pack and the single battery with highest electric quantity or lowest electric quantity in any battery pack through the switch matrix of any battery pack according to the second control instruction;
and S1116, the power conversion module of any battery pack balances the single battery with the highest electric quantity or the lowest electric quantity and the electric quantity of each single battery in any battery pack until the electric quantity of each single battery in any battery pack is consistent.
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