CN110690752A - BMS management method for multi-battery pack parallel control - Google Patents

BMS management method for multi-battery pack parallel control Download PDF

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Publication number
CN110690752A
CN110690752A CN201910968623.0A CN201910968623A CN110690752A CN 110690752 A CN110690752 A CN 110690752A CN 201910968623 A CN201910968623 A CN 201910968623A CN 110690752 A CN110690752 A CN 110690752A
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battery pack
battery
battery packs
switching
total voltage
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CN110690752B (en
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左平
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Saivante Systems
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Dongguan Fenggu Technology Co Ltd
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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
    • H02J7/36Arrangements using end-cell switching
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the technical field of battery management systems in the field of energy storage, in particular to a BMS management method for multi-battery pack parallel control, which comprises the following steps: a, electrifying a system for operation; b, performing system self-check; c, if the self-tests of the two battery packs are passed, selecting the power loop of the battery pack with larger total voltage to be conducted, and maintaining the power loop of the other battery pack in a disconnected state; d, if the received charging instruction is received, executing the operation of switching the single battery packs to work, and selecting the battery pack with higher total voltage to work; e, when the total voltage difference is reduced to a set minimum allowable threshold VoltDown, the operation of switching the double battery packs to work in parallel by the single battery packs is executed; and F, performing the operation of switching the work of the single battery pack by the multi-battery pack. The invention reduces the repeated research and development cost of BMS which is provided with systems with different capacities for regions through the simple configuration of the single battery pack and the multi-battery pack; the multi-battery parallel control can provide a power backup for the system.

Description

BMS management method for multi-battery pack parallel control
Technical Field
The invention relates to the technical field of battery management systems in the field of energy storage, in particular to a BMS management method for multi-battery pack parallel control.
Background
The BATTERY management system (Battery MANAGEMENT SYSTEM) is a monitoring and protecting system for charge and discharge management and fault early warning processing of a BATTERY pack, and is mainly applied to the field of electric vehicles and energy storage. In application, batteries with different capacities are needed in different occasions, and the BMS is difficult to be universal due to different application scenes and requirements and only can be customized and developed. Most of the existing BMS systems are designed based on a single battery pack due to design difficulty and high cost. And once the battery pack has a battery cell which is seriously aged, the whole system cannot continue to work, and no backup battery provides power in an emergency.
Disclosure of Invention
The invention provides a BMS management method for multi-battery parallel control, aiming at the problems in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a BMS management method for multi-battery pack parallel control, which comprises the following steps:
a, electrifying a system for operation;
b, circularly acquiring total voltage information of the two battery packs, and executing system self-inspection;
c, if the self-tests of the two battery packs are passed, comparing the total voltage of the two battery packs, selecting the power loop of the battery pack with larger total voltage to be conducted after multiple comparison and confirmation, and maintaining the power loop of the other battery pack in a disconnected state;
if only one battery pack passes the self-checking, the power circuit of the battery pack is selected to be switched on, and the power circuit of the other battery pack is kept in a disconnected state;
d, in the working state of the single battery pack, if a standby or discharge instruction is received, maintaining the current state, and continuously using the battery pack with higher total voltage to continuously work; if the charging command is received, the operation of switching the single battery packs to work is executed, and the battery pack with higher total voltage is selected to work;
e, setting a minimum allowable threshold VoltDown and a maximum allowable threshold VoltUp of a total voltage difference value, wherein VoltDown is less than VoltUp; during the operation of the single battery packs, the total voltage of the two battery packs is gradually reduced; when the total voltage difference is reduced to a set minimum allowable threshold VoltDown, the operation of switching the double battery packs to work in parallel by the single battery packs is executed;
and F, in the parallel working process of the multiple battery packs, when one battery pack is abnormal or the total voltage difference value of the two battery packs is larger than the set maximum allowable threshold VoltUp, the operation of switching the single battery pack to work by the multiple battery packs is executed.
The operation steps of switching the single battery packs to work in step D comprise:
d1, reducing the current charge and discharge power value to a preset threshold value;
d2, starting the current limiting control circuit and maintaining the set time; the charging and discharging current limiting device is used for limiting the charging and discharging current between the two battery packs and waiting for the reduction of the charging and discharging current;
d3, leading the power hoist of the battery pack to be switched into work, and then disconnecting the power hoist of the current working battery pack;
d4, closing the current-limiting control circuit and recovering the charge and discharge power value;
d5, completing the work switching of the battery pack single group.
The operation step of switching the double battery packs to work in parallel in the single battery pack in the step E comprises the following steps:
e1, reducing the current charge and discharge power value to a preset threshold value;
e2, starting the current limiting control circuit;
e3, conducting the power loop of another battery pack to be switched into operation;
e4, waiting for a preset time; the device is used for limiting the opposite charging and discharging current between the two battery packs and waiting for the opposite charging and discharging current to be reduced;
e5, closing the current-limiting control circuit and recovering the charge and discharge power value;
e6, the operation of switching the single battery pack to the double battery pack is completed.
The operation steps of switching the operation of the single battery pack by the multiple battery packs in the step F comprise:
f1, reducing the current charge and discharge power value to a preset threshold value;
f2, disconnecting the power circuit of the battery pack needing to be stopped, and maintaining the working state of the other battery pack unchanged;
f3, restoring the charge and discharge power value;
and F4, switching the double battery packs to single battery packs, and finishing the working operation.
The invention has the beneficial effects that:
the battery pack management system is novel and ingenious in design, and through simple configuration of the single battery pack and the multiple battery packs, convenience is provided for configuring different battery capacities for the energy storage system, repeated research and development cost of BMSs for configuring different capacity systems is reduced, and efficiency is improved; meanwhile, the multi-battery pack parallel control can provide a power backup for the system.
Drawings
Fig. 1 is a main flowchart of a BMS management method for multi-battery pack parallel control according to the present invention.
Fig. 2 is a control flowchart of the switching operation of the cell groups of the present invention.
Fig. 3 is a control flow chart of the parallel operation of the single battery pack switching double battery packs.
Fig. 4 is a control flow chart of the operation of switching the dual battery packs to the single battery pack according to the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
A BMS management method for multi-battery parallel control includes the following steps:
a, electrifying a system for operation;
b, circularly acquiring total voltage information of the two battery packs, and executing system self-inspection;
c, if the self-tests of the two battery packs are passed, comparing the total voltage of the two battery packs, selecting the power loop of the battery pack with larger total voltage to be conducted after multiple comparison and confirmation, and maintaining the power loop of the other battery pack in a disconnected state;
if only one battery pack passes the self-checking, the power circuit of the battery pack is selected to be switched on, and the power circuit of the other battery pack is kept in a disconnected state;
d, in the working state of the single battery pack, if a standby or discharge instruction is received, maintaining the current state, and continuously using the battery pack with higher total voltage to continuously work; if the charging command is received, the operation of switching the single battery packs to work is executed, and the battery pack with higher total voltage is selected to work;
e, setting a minimum allowable threshold VoltDown and a maximum allowable threshold VoltUp of a total voltage difference value, wherein VoltDown is less than VoltUp; during the operation of the single battery packs, the total voltage of the two battery packs is gradually reduced; when the total voltage difference is reduced to a set minimum allowable threshold VoltDown, the operation of switching the double battery packs to work in parallel by the single battery packs is executed;
and F, in the parallel working process of the multiple battery packs, when one battery pack is abnormal or the total voltage difference value of the two battery packs is larger than the set maximum allowable threshold VoltUp, the operation of switching the single battery pack to work by the multiple battery packs is executed.
The battery pack management system is novel and ingenious in design, and through simple configuration of the single battery pack and the multiple battery packs, convenience is provided for configuring different battery capacities for the energy storage system, repeated research and development cost of BMSs for configuring different capacity systems for regions is reduced, and efficiency is improved; meanwhile, the multi-battery pack parallel control can provide a power backup for the system.
In the BMS management method for multi-battery parallel control according to the embodiment, the operation steps of the single battery packs switching between the operations in step D include: d1, reducing the current charge and discharge power value to a preset threshold value;
d2, starting the current limiting control circuit and maintaining the set time; the charging and discharging current limiting device is used for limiting the charging and discharging current between the two battery packs and waiting for the reduction of the charging and discharging current;
d3, leading the power hoist of the battery pack to be switched into work, and then disconnecting the power hoist of the current working battery pack;
d4, closing the current-limiting control circuit and recovering the charge and discharge power value;
d5, completing the work switching of the battery pack single group.
In the BMS management method for multi-battery pack parallel control according to the embodiment, the operation step of switching the double battery packs to operate in parallel in the single battery pack in the step E includes:
e1, reducing the current charge and discharge power value to a preset threshold value;
e2, starting the current limiting control circuit;
e3, conducting the power loop of another battery pack to be switched into operation;
e4, waiting for a preset time; the device is used for limiting the opposite charging and discharging current between the two battery packs and waiting for the opposite charging and discharging current to be reduced;
e5, closing the current-limiting control circuit and recovering the charge and discharge power value;
e6, the operation of switching the single battery pack to the double battery pack is completed.
In the BMS management method for multi-battery pack parallel control according to this embodiment, the operation step of switching the operation of the single battery pack by the multi-battery pack in the step F includes:
f1, reducing the current charge and discharge power value to a preset threshold value;
f2, disconnecting the power circuit of the battery pack needing to be stopped, and maintaining the working state of the other battery pack unchanged;
f3, restoring the charge and discharge power value;
and F4, switching the double battery packs to single battery packs, and finishing the working operation.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (4)

1. A BMS management method for multi-battery parallel control is characterized by comprising the following steps:
a, electrifying a system for operation;
b, circularly acquiring total voltage information of the two battery packs, and executing system self-inspection;
c, if the self-tests of the two battery packs are passed, comparing the total voltage of the two battery packs, selecting the power loop of the battery pack with larger total voltage to be conducted after multiple comparison and confirmation, and maintaining the power loop of the other battery pack in a disconnected state;
if only one battery pack passes the self-checking, the power circuit of the battery pack is selected to be switched on, and the power circuit of the other battery pack is kept in a disconnected state;
d, in the working state of the single battery pack, if a standby or discharge instruction is received, maintaining the current state, and continuously using the battery pack with higher total voltage to continuously work; if the charging command is received, the operation of switching the single battery packs to work is executed, and the battery pack with higher total voltage is selected to work;
e, setting a minimum allowable threshold VoltDown and a maximum allowable threshold VoltUp of a total voltage difference value, wherein VoltDown is less than VoltUp; during the operation of the single battery packs, the total voltage of the two battery packs is gradually reduced; when the total voltage difference is reduced to a set minimum allowable threshold VoltDown, the operation of switching the double battery packs to work in parallel by the single battery packs is executed;
and F, in the parallel working process of the multiple battery packs, when one battery pack is abnormal or the total voltage difference value of the two battery packs is larger than the set maximum allowable threshold VoltUp, the operation of switching the single battery pack to work by the multiple battery packs is executed.
2. The BMS management method for multi-battery parallel control according to claim 1, wherein the operation step of switching the operation of the single battery packs to each other in the step D comprises:
d1, reducing the current charge and discharge power value to a preset threshold value;
d2, starting the current limiting control circuit and maintaining the set time; the charging and discharging current limiting device is used for limiting the charging and discharging current between the two battery packs and waiting for the reduction of the charging and discharging current;
d3, leading the power hoist of the battery pack to be switched into work, and then disconnecting the power hoist of the current working battery pack;
d4, closing the current-limiting control circuit and recovering the charge and discharge power value;
d5, completing the work switching of the battery pack single group.
3. The BMS management method for multi-battery pack parallel control according to claim 1, wherein the operation step of switching the dual battery pack parallel operation of the single battery pack in the step E comprises:
e1, reducing the current charge and discharge power value to a preset threshold value;
e2, starting the current limiting control circuit;
e3, conducting the power loop of another battery pack to be switched into operation;
e4, waiting for a preset time; the device is used for limiting the opposite charging and discharging current between the two battery packs and waiting for the opposite charging and discharging current to be reduced;
e5, closing the current-limiting control circuit and recovering the charge and discharge power value;
e6, the operation of switching the single battery pack to the double battery pack is completed.
4. The BMS management method for multi-battery parallel control according to claim 1, wherein the operation step of switching the operation of the unit battery pack in the step F comprises:
f1, reducing the current charge and discharge power value to a preset threshold value;
f2, disconnecting the power circuit of the battery pack needing to be stopped, and maintaining the working state of the other battery pack unchanged;
f3, restoring the charge and discharge power value;
and F4, switching the double battery packs to single battery packs, and finishing the working operation.
CN201910968623.0A 2019-10-12 2019-10-12 BMS management method for multi-battery pack parallel control Active CN110690752B (en)

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CN112821485A (en) * 2020-12-31 2021-05-18 广州极飞科技股份有限公司 Control method of battery combination system, battery combination system and unmanned device
WO2021189176A1 (en) * 2020-03-23 2021-09-30 Techtronic Cordless Gp Multi-battery management for portable device
WO2021260719A1 (en) * 2020-06-25 2021-12-30 Tvs Motor Company Limited Energy storage device

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CN112821485B (en) * 2020-12-31 2023-06-09 广州极飞科技股份有限公司 Control method of battery combination system, battery combination system and unmanned device

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