CN113644383A - Battery energy storage system capable of self-adjusting maintenance and method thereof - Google Patents

Battery energy storage system capable of self-adjusting maintenance and method thereof Download PDF

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Publication number
CN113644383A
CN113644383A CN202111075044.7A CN202111075044A CN113644383A CN 113644383 A CN113644383 A CN 113644383A CN 202111075044 A CN202111075044 A CN 202111075044A CN 113644383 A CN113644383 A CN 113644383A
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battery
voltage
battery pack
cluster
fault
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CN202111075044.7A
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尚德华
杨泽乾
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Aopu Shanghai New Energy Co Ltd
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Aopu Shanghai New Energy Co Ltd
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Priority to CN202111075044.7A priority Critical patent/CN113644383A/en
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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/251—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for stationary devices, e.g. power plant buffering or backup power supplies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/519—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising printed circuit boards [PCB]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
    • 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 a battery energy storage system capable of self-adjusting maintenance and a method thereof. The invention has the beneficial effects that: the bypass is added in the battery pack, when a problem or a fault of a certain battery pack or battery is detected, the original main circuit of the battery pack is disconnected and the bypass is connected, the battery pack with the problem is isolated, meanwhile, the DC/DC voltage transformation unit connected to the battery cluster changes the voltage of the battery cluster to the original voltage, the battery cluster can continue to work, and the shutdown of an energy storage system is avoided. And the maintenance or replacement of the problematic battery is finished in the working interval period of the energy storage system, so that the adverse effect and the reduction of the yield are reduced. In addition, when no fault occurs, the DC/DC voltage transformation unit of the battery cluster also adjusts the voltage of the battery cluster to keep the voltage at the specified working voltage, thereby avoiding the risk of circulation caused by inconsistent voltage among the battery clusters and simultaneously reducing the inconsistency among the batteries.

Description

Battery energy storage system capable of self-adjusting maintenance and method thereof
Technical Field
The invention relates to a battery energy storage system, in particular to a battery energy storage system capable of self-adjusting maintenance and a method thereof, and belongs to the technical field of large-scale energy storage of lithium ion batteries.
Background
At present, in the field of large energy storage of lithium ion batteries, lithium battery monomers are firstly combined into a module in a series-parallel connection mode, then the module is assembled into a battery pack in a series or parallel connection mode, the battery pack is installed on a battery frame in a series-parallel connection mode to form a battery cluster, and then the battery cluster is connected in series-parallel connection and then connected into a PCS (bidirectional converter) to form an energy storage system.
With the development of energy storage technology, battery energy storage systems have been used in various application scenarios. For example, in frequency modulation energy storage systems for assisting power plant frequency modulation, peak modulation energy storage systems for reducing load pressure regulation peak valley of a power grid, micro-grid energy storage systems for remote areas or islands, and the like, the energy storage systems become indispensable power supply modes, so that higher requirements on stability and timely repair capability of the energy storage systems are provided.
According to the prior art, when a certain battery pack or battery in the energy storage system has a problem or a fault, the energy storage system is shut down and maintained integrally, so that the utilization rate of the energy storage system is reduced, the inconsistency of the battery is increased, a standby system is required to be added for preventing the long-time shutdown, the initial investment of the whole system is increased, the investment recovery period of the energy storage system is prolonged, and the further popularization and application of the battery energy storage system are not facilitated.
The large-scale energy storage system usually adopts a container storage form, lithium ion batteries firstly form a battery module, the battery module forms a battery plug box (Pack), the battery plug box forms a battery cluster, the battery cluster is connected in series and parallel and then is connected into a convergence device, and then the battery cluster, PCS, EMS and the like form an energy storage system. When a certain battery pack or battery in the energy storage system has a problem or a fault, the battery cluster connected with the same PCS needs to be shut down for inspection or maintenance, so that the utilization rate of the energy storage system is greatly reduced, and the loss caused by shutdown is larger along with the application of the high-voltage high-power PCS, and the benefit of the energy storage system is seriously influenced.
Disclosure of Invention
The invention aims to solve the problems and provide a battery energy storage system capable of self-adjusting maintenance and a method thereof.
The invention realizes the purpose through the following technical scheme: a self-maintenance adjustable battery energy storage system comprises
The battery pack is provided with a plurality of batteries which are connected in series and are arranged on the battery frame;
a high-voltage box connected to the battery packs connected in series and installed at one side of the bottom end of the battery rack;
and the DC/DC transformation unit is connected with the high-voltage box, is connected into a main circuit of the battery cluster, and is arranged on the other side of the bottom end of the battery rack.
As a still further scheme of the invention: install relay switch one on the major loop of battery package, be connected with the bypass between total positive and total negative of battery package and install relay switch two on the bypass, through the switching of relay switch one and relay switch two, can control the access and the isolation of battery package.
The use method of the battery energy storage system capable of self-adjusting maintenance comprises the following steps
Firstly, mounting a battery pack, putting batteries (or battery modules) into the battery pack according to the series-parallel connection design requirement, and connecting the batteries in series-parallel connection;
secondly, a relay switch I is also arranged on a main loop of the battery pack besides a fuse;
and thirdly, a bypass is connected between the total positive and the total negative of the battery pack, and a relay switch II is installed on the bypass to control the on-off of the bypass. The access and isolation of the battery pack can be controlled through the first relay switch and the second relay switch, and when the second relay switch is switched off and the first relay switch is switched on, the battery pack is accessed into the battery cluster; when the relay switch II is closed and the relay switch I is disconnected, the battery pack isolates the battery cluster;
fourthly, after the acquisition wiring harness of the acquisition unit of the BMS is installed, the installation of other parts of the battery pack is completed;
fifthly, mounting the mounted battery pack on a battery frame, and mounting a high-voltage box and a DC/DC voltage transformation unit on the battery frame;
sixthly, connecting the battery packs in series and parallel, then connecting the high-voltage box and the DC/DC voltage transformation unit, finally accessing the main circuit of the battery cluster through the DC/DC voltage transformation unit, and then connecting the battery clusters with the PCS after converging;
and seventhly, after the primary acquisition unit of the BMS is in communication connection with the master control BCU in the high-voltage box, the BCUs of each cluster are connected into the BAMS to be gathered and then are in communication connection with the EMS, and the EMS is in communication connection with the PCS to form a complete battery energy storage system.
As a still further scheme of the invention: the self-adjusting process of the battery pack is further included:
firstly, detecting all battery packs in a battery cluster by a BMS management system, judging whether a fault battery pack exists or not, judging whether the voltage of the battery cluster is within a specified range (generally rated voltage) or not when the fault battery pack does not exist, normally operating the battery cluster when the voltage of the battery cluster meets the requirement, and starting a DC/DC transformer to adjust the voltage to meet the requirement and then switching in the battery cluster to operate when the voltage of the battery cluster does not meet the requirement;
when the number x of the fault battery packs is larger than the maximum allowable number, directly stopping the battery cluster and alarming to be maintained;
when the number x of the fault battery packs is within the maximum allowable number, further judging the type and the level of the fault, if the fault level is a three-level serious fault, directly stopping the battery cluster and alarming to be maintained;
if the fault grade is a second-grade middle-grade fault; stopping and isolating the fault battery pack, starting a DC/DC transformer to regulate the voltage to be within a specified range, enabling the battery pack to enter a state to be detected, and continuing to operate the battery cluster;
and fifthly, if the fault grade is a first-level slight fault, the fault battery pack is stopped and isolated, the DC/DC transformer is started to regulate the voltage to be within a specified range, the battery cluster continues to operate, and meanwhile, the battery pack is reconnected after the BMS regulates and repairs the battery pack to meet the requirements.
The invention has the beneficial effects that: after the lithium batteries form the battery pack, the bypass is added in the battery pack, when a problem or fault of a certain battery pack or battery is detected, the original main circuit of the battery pack is disconnected and the bypass is connected, the battery pack with the problem is isolated, meanwhile, the DC/DC voltage transformation unit connected to the battery cluster changes the voltage of the battery cluster to the original voltage (the original working voltage of the battery cluster), the battery cluster can continue to work, and the shutdown of an energy storage system is avoided. And the maintenance or replacement of the problematic battery is finished in the working interval period of the energy storage system, so that the influence on the whole energy storage system is effectively reduced, and the adverse effect and the reduction of the benefit are reduced. In addition, when no fault occurs, the DC/DC voltage transformation unit of the battery cluster also adjusts the voltage of the battery cluster to keep the voltage at the specified working voltage, thereby avoiding the risk of circulation caused by inconsistent voltage among the battery clusters and simultaneously reducing the inconsistency among the batteries.
Drawings
Fig. 1 is a schematic view of a battery cluster connection structure according to the present invention.
Fig. 2 is a schematic diagram of a switch structure of the battery pack of the present invention.
FIG. 3 is a logic diagram of the present invention.
In the figure: 1. the device comprises a battery pack, 2, a battery frame, 3, a high-voltage box, 4, a DC/DC transformation unit, 11, first relay switches and 12 and a second relay switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1-2, a battery energy storage system capable of self-adjusting maintenance includes
The battery pack 1 is provided with a plurality of batteries which are connected in series and arranged on the battery frame 2;
a high-voltage case 3 connected to the battery packs 1 connected in series and mounted on one side of the bottom end of the battery holder 2;
and the DC/DC transformation unit 4 is connected with the high-voltage box 3, is connected into a main circuit of the battery cluster, and is arranged on the other side of the bottom end of the battery frame 2.
In the embodiment of the invention, a first relay switch 11 is installed on a main loop of the battery pack 1, a bypass is connected between the total positive and total negative of the battery pack 1, a second relay switch 12 is installed on the bypass, and the access and isolation of the battery pack 1 can be controlled by opening and closing the first relay switch 11 and the second relay switch 12.
Example two
Referring to fig. 1 to 3, a method for using a battery energy storage system capable of self-adjusting maintenance includes the following steps
Firstly, installing a battery pack 1, putting batteries (or battery modules) into the battery pack 1 according to the series-parallel connection design requirement, and connecting the batteries in series-parallel connection;
secondly, a relay switch I11 is also arranged on a main loop of the battery pack 1 besides a fuse;
and thirdly, a bypass is connected between the total positive and the total negative of the battery pack 1, and a relay switch II 12 is installed on the bypass to control the on-off of the bypass. The access and isolation of the battery pack can be controlled through the first relay switch 11 and the second relay switch 12, and when the second relay switch 12 is switched off and the first relay switch 11 is switched on, the battery pack is accessed into the battery cluster; when the second relay switch 12 is closed and the first relay switch 11 is opened, the battery pack isolates the battery cluster;
fourthly, after the acquisition wiring harness of the acquisition unit of the BMS is installed, the installation of other parts of the battery pack 1 is completed;
fifthly, the mounted battery pack 1 is mounted on a battery frame 2, and a high-voltage box 3 and a DC/DC voltage transformation unit 4 are also mounted on the battery frame;
sixthly, after the battery packs 1 are connected in series and parallel, the high-voltage box 3 and the DC/DC voltage transformation unit 4 are connected, and finally the battery packs are connected to a main circuit of a battery cluster through the DC/DC voltage transformation unit 4, and then the battery clusters are connected with the PCS after being converged;
and seventhly, after the primary acquisition unit of the BMS is in communication connection with the master control BCU in the high-voltage box 3, the BCUs of each cluster are connected into the BAMS to be collected and then are in communication connection with the EMS, and the EMS is in communication connection with the PCS to form a complete battery energy storage system.
In the embodiment of the present invention, the method further includes a self-adjusting process of the battery pack 1:
firstly, detecting all battery packs in a battery cluster by a BMS management system, judging whether a fault battery pack exists or not, judging whether the voltage of the battery cluster is within a specified range (generally rated voltage) or not when the fault battery pack does not exist, normally operating the battery cluster when the voltage of the battery cluster meets the requirement, and starting a DC/DC transformer to adjust the voltage to meet the requirement and then switching in the battery cluster to operate when the voltage of the battery cluster does not meet the requirement;
when the number x of the fault battery packs is larger than the maximum allowable number, directly stopping the battery cluster and alarming to be maintained;
when the number x of the fault battery packs is within the maximum allowable number, further judging the type and the level of the fault, if the fault level is a three-level serious fault, directly stopping the battery cluster and alarming to be maintained;
if the fault grade is a second-grade middle-grade fault; stopping and isolating the fault battery pack, starting a DC/DC transformer to regulate the voltage to be within a specified range, enabling the battery pack to enter a state to be detected, and continuing to operate the battery cluster;
and fifthly, if the fault grade is a first-level slight fault, the fault battery pack is stopped and isolated, the DC/DC transformer is started to regulate the voltage to be within a specified range, the battery cluster continues to operate, and meanwhile, the battery pack is reconnected after the BMS regulates and repairs the battery pack to meet the requirements.
The working principle is as follows: after the lithium batteries form the battery pack, the bypass is added in the battery pack, when a problem or fault of a certain battery pack or battery is detected, the original main circuit of the battery pack is disconnected and the bypass is connected, the battery pack with the problem is isolated, meanwhile, the DC/DC voltage transformation unit connected to the battery cluster changes the voltage of the battery cluster to the original voltage (the original working voltage of the battery cluster), the battery cluster can continue to work, and the shutdown of an energy storage system is avoided. And the maintenance or replacement of the problematic battery is finished in the working interval period of the energy storage system, so that the influence on the whole energy storage system is effectively reduced, and the adverse effect and the reduction of the benefit are reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (4)

1. A battery energy storage system capable of self-adjusting maintenance is characterized in that: comprises that
The battery pack (1) is provided with a plurality of batteries which are connected in series and are arranged on the battery frame (2);
a high-voltage box (3) connected to the battery packs (1) connected in series and mounted on the bottom end side of the battery holder (2);
and the DC/DC transformation unit (4) is connected with the high-voltage box (3) and is connected into a main circuit of the battery cluster, and is arranged on the other side of the bottom end of the battery rack (2).
2. The self-maintenance adjustable battery energy storage system of claim 1, wherein: install relay switch one (11) on the major loop of battery package (1), be connected with the bypass between the total positive and the total burden of battery package (1) and install relay switch two (12) on the bypass.
3. A method for using the battery energy storage system capable of self-adjusting maintenance according to claim 1, wherein the method comprises the following steps: the using method comprises the following steps
1) Firstly, installing a battery pack (1), putting batteries into the battery pack (1) according to the series-parallel connection design requirement, and connecting the batteries in series-parallel connection;
2) a primary circuit of the battery pack (1) is provided with a first relay switch (11) besides a fuse;
3) a bypass is connected between the total positive and the total negative of the battery pack (1), and a relay switch II (12) is installed on the bypass to control the on-off of the bypass; the access and isolation of the battery pack can be controlled through the first relay switch (11) and the second relay switch (12), and when the second relay switch (12) is switched off and the first relay switch (11) is switched on, the battery pack is accessed into the battery cluster; when the relay switch II (12) is closed and the relay switch I (11) is opened, the battery pack isolates the battery cluster;
4) after the acquisition wiring harness of the acquisition unit of the BMS is installed, the installation of other parts of the battery pack (1) is completed;
5) the mounted battery pack (1) is mounted on a battery frame (2), and a high-voltage box (3) and a DC/DC voltage transformation unit (4) are also mounted on the battery frame;
6) the battery packs (1) are connected in series and parallel, then connected with the high-voltage box (3) and the DC/DC voltage transformation unit (4), finally connected to a main circuit of a battery cluster through the DC/DC voltage transformation unit (4), and then connected with the PCS after being converged;
7) and after a primary acquisition unit of the BMS is in communication connection with a main control BCU in the high-voltage box (3), the BCUs of each cluster are accessed into the BAMS to be collected and then are in communication connection with the EMS, and the EMS is in communication connection with the PCS to form a complete battery energy storage system.
4. The method of using a self-adjustable maintenance battery energy storage system of claim 3, wherein: further comprising a self-adjusting process of the battery pack (1):
firstly, detecting all battery packs in a battery cluster by a BMS management system, judging whether a fault battery pack exists or not, judging whether the voltage of the battery cluster is in a specified range or not when the fault battery pack does not exist, normally operating the battery cluster when the voltage of the battery cluster meets the requirement, and starting a DC/DC transformer to adjust the voltage to meet the requirement and then switching in the operation when the voltage of the battery cluster does not meet the requirement;
when the number x of the fault battery packs is larger than the maximum allowable number, directly stopping the battery cluster and alarming to be maintained;
when the number x of the fault battery packs is within the maximum allowable number, further judging the type and the level of the fault, if the fault level is a three-level serious fault, directly stopping the battery cluster and alarming to be maintained;
if the fault grade is a second-grade middle-grade fault; stopping and isolating the fault battery pack, starting a DC/DC transformer to regulate the voltage to be within a specified range, enabling the battery pack to enter a state to be detected, and continuing to operate the battery cluster;
and fifthly, if the fault grade is a first-level slight fault, the fault battery pack is stopped and isolated, the DC/DC transformer is started to regulate the voltage to be within a specified range, the battery cluster continues to operate, and meanwhile, the battery pack is reconnected after the BMS regulates and repairs the battery pack to meet the requirements.
CN202111075044.7A 2021-09-14 2021-09-14 Battery energy storage system capable of self-adjusting maintenance and method thereof Pending CN113644383A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114784435A (en) * 2022-04-22 2022-07-22 湖南省电将军云储科技有限公司 Energy storage battery system architecture
CN115064793A (en) * 2022-07-27 2022-09-16 湖南省正源储能材料与器件研究所 Battery replacing device, battery module and battery replacing method
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WO2023124502A1 (en) * 2021-12-30 2023-07-06 华为数字能源技术有限公司 Energy storage system and control method for energy storage system
CN114784435A (en) * 2022-04-22 2022-07-22 湖南省电将军云储科技有限公司 Energy storage battery system architecture
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Application publication date: 20211112