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CN118232472A - Battery cluster cutting-in method and device and centralized energy storage system - Google Patents

Battery cluster cutting-in method and device and centralized energy storage system Download PDF

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Publication number
CN118232472A
CN118232472A CN202410340565.8A CN202410340565A CN118232472A CN 118232472 A CN118232472 A CN 118232472A CN 202410340565 A CN202410340565 A CN 202410340565A CN 118232472 A CN118232472 A CN 118232472A
Authority
CN
China
Prior art keywords
battery cluster
charge
battery
target range
cluster
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202410340565.8A
Other languages
Chinese (zh)
Inventor
高文凯
施静辉
徐中华
钱振华
李俊涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vision Energy Technology Shanghai Co ltd
Envision Energy Co Ltd
Original Assignee
Vision Energy Technology Shanghai Co ltd
Envision Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vision Energy Technology Shanghai Co ltd, Envision Energy Co Ltd filed Critical Vision Energy Technology Shanghai Co ltd
Priority to CN202410340565.8A priority Critical patent/CN118232472A/en
Publication of CN118232472A publication Critical patent/CN118232472A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to the field of energy storage, and provides a battery cluster cutting-in method, a device and a centralized energy storage system. The method comprises the following steps: if a battery cluster cutting-in requirement exists, and the pressure difference between a first battery cluster to be cut-in and a second battery cluster in the high-voltage main circuit is larger than a preset threshold value, respectively calculating the charge states of the first battery cluster and the second battery cluster so as to respectively charge and discharge the first battery cluster and/or the second battery cluster, and when the charge states of the first battery cluster and the second battery cluster are in a target range of a charge and discharge platform period, enabling the first battery cluster and the second battery cluster to be connected into the high-voltage main circuit. When the battery cluster to be cut in is switched into the energy storage system, the first battery cluster and the second battery cluster are both switched into the high-voltage main loop by regulating and controlling the charge state between the battery cluster to be cut in and the battery cluster in the high-voltage connection state to enable the battery cluster to be in the charge-discharge platform period, so that the safe cut-in of the battery clusters is realized.

Description

Battery cluster cutting-in method and device and centralized energy storage system
Technical Field
The present application relates to the field of energy storage, and in particular, to a method and apparatus for cutting in a battery cluster and a centralized energy storage system.
Background
For an energy storage system such as a centralized direct current side parallel connection, when an individual battery cluster is disconnected, after other battery clusters continue to operate for a period of time, a larger charge State (State of charge, SOC) difference is generated between the disconnected battery cluster and other battery clusters, and the difference is particularly shown as a larger pressure difference between the battery clusters. When the pressure difference between the battery clusters is large, the energy storage system cannot execute power access of the battery clusters, so that performance exertion of the energy storage system is affected; therefore, how to realize the secure access of the battery cluster is a problem to be solved.
Disclosure of Invention
In a first aspect, the present application provides a method for cutting into a battery cluster, including:
If a battery cluster cutting-in requirement exists, and the pressure difference between a first battery cluster to be cut-in and a second battery cluster in a high-voltage main loop is determined to be larger than a preset threshold value, respectively calculating the charge states of the first battery cluster and the second battery cluster;
And respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, and enabling the first battery cluster and the second battery cluster to be connected into the high-voltage main loop when the charge states of the first battery cluster and the second battery cluster are in a target range of a charge and discharge platform period.
In an alternative embodiment, before the charging and discharging treatment is performed on the first battery cluster and/or the second battery cluster according to the state of charge, the method further includes:
And setting a target range in a charge-discharge platform period according to the charge state, and respectively carrying out charge-discharge treatment on the first battery cluster and/or the second battery cluster according to the target range.
In an alternative embodiment, before said charging said first battery cluster, the method further comprises:
and cutting the second battery cluster out of the high-voltage main circuit, and cutting the first battery cluster into the high-voltage main circuit so as to carry out charging treatment.
In an alternative embodiment, the charging and discharging process is performed on the first battery cluster and/or the second battery cluster according to the target range, including:
If the charge state of any battery cluster is larger than the maximum boundary value of the target range, discharging the corresponding battery cluster;
if the charge state of any battery cluster is smaller than the minimum boundary value of the target range, charging the corresponding battery cluster;
if the charge state of any battery cluster is within the target range, no processing is performed.
In an alternative embodiment, if the state of charge of the first battery cluster is within the target range, the state of charge of the second battery cluster is not within the target range; and respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, wherein the charge and discharge treatment comprises the following steps:
If the state of charge of the second battery cluster is greater than the maximum boundary value of the target range, performing discharge treatment or charge-after-discharge treatment on the second battery cluster, so that the real-time state of charge of the second battery cluster is within the target range;
and if the charge state of the second battery cluster is smaller than the maximum boundary value of the target range, carrying out charge processing or charge-before-discharge processing on the second battery cluster, so that the real-time charge state of the second battery cluster is in the target range.
In an alternative embodiment, if the state of charge of the second battery cluster is within the target range, the state of charge of the first battery cluster is not within the target range; and respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, wherein the charge and discharge treatment comprises the following steps:
If the charge state of the first battery cluster is greater than the maximum boundary value of the target range, performing discharge treatment or charge treatment after first discharge on the first battery cluster, so that the real-time charge state of the first battery cluster is in the target range;
And if the charge state of the first battery cluster is smaller than the maximum boundary value of the target range, carrying out charge processing or charge-before-discharge processing on the first battery cluster, so that the real-time charge state of the first battery cluster is in the target range.
In an alternative embodiment, the states of charge of the first and second battery clusters are not within the target range; and respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, wherein the charge and discharge treatment comprises the following steps:
If the charge states of the first battery cluster and the second battery cluster are both larger than the maximum boundary value of the target range, carrying out discharge treatment or charge treatment after pre-discharge on the first battery cluster and the second battery cluster;
if the charge states of the first battery cluster and the second battery cluster are smaller than the maximum boundary value of the target range, carrying out charging treatment or charging-then-discharging treatment on the first battery cluster and the second battery cluster;
And if the charge state of one battery cluster is smaller than the target range and the charge state of the other battery cluster is larger than the target range, carrying out charge processing or charge-before-discharge processing on the certain battery cluster, and correspondingly carrying out discharge-before-charge processing or discharge processing on the other battery cluster.
In a second aspect, the present application provides a battery cluster cut-in apparatus comprising:
The computing module is used for respectively computing the charge states of the first battery cluster and the second battery cluster when the battery cluster cutting-in requirement exists and the pressure difference between the first battery cluster to be cut-in and the second battery cluster in the high-voltage main loop is determined to be larger than a preset threshold value;
and the cut-in module is used for respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, and enabling the first battery cluster and the second battery cluster to be connected into the high-voltage main loop when the charge states of the first battery cluster and the second battery cluster are in a target range of a charge and discharge platform period.
In a third aspect, the present application provides a centralized energy storage system, comprising at least two battery clusters, a memory, and at least one processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the foregoing battery cluster cutting-in method.
In a fourth aspect, the present application provides a computer storage medium storing a computer program which, when executed, implements a battery cluster cut-in method according to the foregoing.
The embodiment of the application has the following beneficial effects:
The embodiment of the application provides a battery cluster cutting-in method, which comprises the following steps: if the battery cluster cutting-in requirement exists, and the pressure difference between the first battery cluster to be cut-in and the second battery cluster in the high-voltage main loop is determined to be larger than a preset threshold value, respectively calculating the charge states of the first battery cluster and the second battery cluster; and respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge states, and enabling the first battery cluster and the second battery cluster to be connected into the high-voltage main loop when the charge states of the first battery cluster and the second battery cluster are in the target range of the charge and discharge platform period. When the battery clusters to be cut in are switched into the energy storage system, the first battery cluster and the second battery cluster are switched into the high-voltage main loop by regulating and controlling the charge states between the battery clusters to be cut in and the battery clusters in the high-voltage connection state, and when the charge states are in the target range of the charge-discharge platform period, the first battery cluster and the second battery cluster are switched into the high-voltage main loop, so that safe and rapid cutting in of the battery clusters is realized.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are required for the embodiments will be briefly described, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of the present application. Like elements are numbered alike in the various figures.
FIG. 1 is a schematic flow chart of a method for cutting into battery clusters according to an embodiment of the application;
FIG. 2 illustrates a schematic diagram of an architecture of an energy storage system in an embodiment of the present application;
Fig. 3 is a schematic diagram showing a structure of a battery cluster cutting device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments.
The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
The terms "comprises," "comprising," "including," or any other variation thereof, are intended to cover a specific feature, number, step, operation, element, component, or combination of the foregoing, which may be used in various embodiments of the present application, and are not intended to first exclude the presence of or increase the likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the application belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the application.
The battery SOC (i.e., state of charge) is a state of charge used to reflect the remaining capacity of a battery, and is defined numerically as the ratio of the remaining capacity to the battery capacity.
The application provides a battery cluster cutting-in method, which is characterized in that when a battery cluster to be cut-in is switched in a centralized energy storage system, the state of charge between the battery cluster to be cut-in and the battery cluster in a high-voltage connection state is regulated, and when the battery clusters are in a target range of a charge-discharge platform period, both a first battery cluster and a second battery cluster are connected in a high-voltage main loop, so that the safe cutting-in of the battery clusters is realized.
Referring to fig. 1, the following describes the battery cluster cutting method in detail; the battery cluster cut-in method can be applied to equipment or a system with an energy storage function.
S10, if a battery cluster cutting-in requirement exists, and it is determined that the pressure difference between the first battery cluster to be cut-in and the second battery cluster in the high-voltage main loop is larger than a preset threshold value, the charge states of the first battery cluster and the second battery cluster are calculated respectively.
And S20, respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, and enabling the first battery cluster and the second battery cluster to be connected into a high-voltage main loop when the charge states of the first battery cluster and the second battery cluster are in a target range of a charge and discharge platform period.
Exemplary embodiments of the present application are described based on a centralized energy storage system architecture, in which a plurality of battery clusters are connected to a high-voltage main circuit through a bus, and optionally, all battery clusters can be switched to the energy storage system through a switch in the schematic diagram of the energy storage system architecture shown in fig. 2. The high-voltage main loop is used for carrying out charge and discharge treatment on each connected battery cluster through the inverter; the embodiment of the application can also realize voltage conversion through the power conversion module, so that the power supply voltage with corresponding voltage class is provided for each battery cluster to charge, or the voltage of each battery cluster is converted into the power supply voltage to be input into a high-voltage main loop for discharging.
In this embodiment, in order to facilitate discrimination, a battery cluster to be cut into the high-voltage main circuit is used as a first battery cluster, and a battery cluster which is already connected into the high-voltage main circuit is used as a second battery cluster; the number of the battery clusters connected to the high-voltage main circuit, the number of the battery clusters to be cut in, and the setting in the target range of the charge-discharge platform period can all be set according to actual requirements, and are not limited herein.
In this embodiment, if a battery cluster switching-in requirement exists and it is determined that a pressure difference between a first battery cluster to be switched in and a second battery cluster in the high-voltage main circuit is greater than a preset threshold value capable of being switched in directly in the high-voltage main circuit, switching-in of the battery clusters is achieved by regulating and controlling a state of charge between the first battery cluster and the second battery cluster. The above-mentioned preset threshold value for determining that the battery cluster can be cut in directly may be specifically set according to actual requirements, which is not limited in this embodiment.
Specifically, if there is a first battery cluster to be cut into the high-voltage main circuit, and the pressure difference between the first battery cluster and the second battery cluster is large, so that the cut-in of the battery clusters is realized, so as to ensure that the first battery cluster and the second battery cluster are connected into the high-voltage main circuit.
It should be noted that whether the battery clusters can be safely connected to the high-voltage main circuit depends on whether the total voltage difference between the battery clusters is within a preset threshold range, wherein the total voltage difference between the battery clusters and the average cell voltage (i.e., the battery voltage) of each battery cluster have a clear corresponding relationship, so that the total voltage difference between the battery clusters can be within the preset threshold range by controlling the voltage difference of the average cell voltage between the battery clusters within the preset threshold range.
In addition, due to the electrochemical characteristics of the battery, the battery voltage and the SOC are weakened in a non-platform period of charge and discharge, and the battery capacity is strong in correlation; in the platform period, the battery voltage fluctuation is slow, the correlation between the battery voltage and the SOC is enhanced, and the correlation between the battery voltage and the battery capacity is weakened; furthermore, the embodiment utilizes the strong correlation between the charge states of the batteries and the battery voltages in the platform period, and regulates the charge states of the battery clusters in the platform period to enable the pressure difference between the battery clusters to be smaller than a preset threshold range, so that the safety cut-in of the battery clusters is realized.
It can be understood that in the platform period, due to the strong correlation between the state of charge of the battery and the battery voltage and the synchronous change amplitude of the state of charge and the battery voltage, the state of charge of the battery and the battery voltage can be equivalently simulated in the platform period, so that the regulation and control of the battery voltage can be equivalently realized by regulating the state of charge of the battery to the platform period, and further, the battery cluster is safely cut into the high-voltage main loop; in addition, the battery voltage of each battery cluster in the platform period is in a stable state, so that the allowable range of calculation errors of the charge states of each battery cluster is greatly enlarged, and the cutting-in difficulty of the battery clusters is greatly reduced. The preset threshold range may be specifically set according to actual requirements, which is not limited herein.
Preferably, before the battery cluster is subjected to charge-discharge processing, a target range in a charge-discharge platform period may be set according to the state of charge, so as to respectively perform charge-discharge processing on the first battery cluster and/or the second battery cluster according to the target range.
It can be understood that, according to the current state of charge of each battery cluster, the embodiment of the application sets a target range value which is in the charge-discharge platform period and is close to the current state of charge of each battery cluster; and then carrying out charge and discharge treatment on the battery clusters through the target range value so as to adjust each battery cluster to be in a charge and discharge plateau period.
For example, the range setting of the platform period can be set according to actual situations when the battery cluster cut-in control is performed, in this embodiment, according to a general battery characteristic curve (such as a battery characteristic curve of a lithium battery), the SOC is between 30% and 60%, 65% and 95% and the rest is a non-platform period; further, the target range value set in the present embodiment may be any one of 30% to 60% and 65% to 95%.
It is worth to be noted that, in this embodiment, by adjusting and controlling the SOC of each battery cluster, the voltage difference of the average voltage between each battery cluster is stabilized within a preset threshold range, and then the battery clusters to be connected are cut in; specifically, charge and discharge processing is performed on each battery cluster to enable the battery cluster to be in a platform period, then the SOC of each battery cluster in the platform period is regulated and controlled to enable the SOC of each battery cluster to be in a target range value, and then cutting-in of the battery cluster is achieved, so that safety and reliability of cutting-in of the battery cluster are improved.
In order to further improve the safety of the cut-in of the battery clusters, the last power consumption processing of each battery cluster may be guaranteed to be the same when the first battery cluster and the second battery cluster are subjected to the charge/discharge processing, that is, the last processing mode of each battery cluster is guaranteed to be the same processing mode (for example, the last execution operation between each battery cluster is a charge operation or a discharge operation, optionally, if the duration of any battery cluster in executing a certain processing process is longer than a preset duration, it is determined that the battery cluster currently executes the processing operation, for example, if the last execution operation of the first battery cluster is a charge operation and the execution duration is longer than the preset duration, it is determined that the last power consumption processing of the first battery cluster is a charge processing.
Further, according to the target range, respectively performing charge and discharge treatment on the first battery cluster and/or the second battery cluster, specifically, if the charge state of any battery cluster is greater than the maximum boundary value of the target range, performing discharge treatment on the corresponding battery cluster; if the charge state of any battery cluster is smaller than the minimum boundary value of the target range, charging the corresponding battery cluster; if the charge state of any battery cluster is in the target range, the corresponding battery cluster is not processed.
For example, if the state of charge of the first battery cluster is within the target range, the state of charge of the second battery cluster is not within the target range; if the state of charge of the second battery cluster is greater than the maximum boundary value of the target range, performing discharge treatment or pre-discharge and post-charge treatment on the second battery cluster, so that the real-time state of charge of the second battery cluster is in the target range; or if the state of charge of the second battery cluster is smaller than the maximum boundary value of the target range, carrying out charging treatment or charging-then-discharging treatment on the second battery cluster, so that the real-time state of charge of the second battery cluster is in the target range.
If the charge state of the second battery cluster is in the target range, the charge state of the first battery cluster is not in the target range; if the state of charge of the first battery cluster is greater than the maximum boundary value of the target range, performing discharge treatment or pre-discharge and post-charge treatment on the first battery cluster, so that the real-time state of charge of the first battery cluster is in the target range; or if the state of charge of the first battery cluster is smaller than the maximum boundary value of the target range, carrying out charging treatment or charging-then-discharging treatment on the first battery cluster, so that the real-time state of charge of the first battery cluster is in the target range.
If the charge states of the first battery cluster and the second battery cluster are not in the target range; if the charge states of the first battery cluster and the second battery cluster are both larger than the maximum boundary value of the target range, performing discharge treatment or charge treatment after first discharging on the first battery cluster and the second battery cluster; or if the charge states of the first battery cluster and the second battery cluster are smaller than the maximum boundary value of the target range, carrying out charge treatment or charge-before-discharge treatment on the first battery cluster and the second battery cluster; or if the charge state of one battery cluster is smaller than the target range and the charge state of the other battery cluster is larger than the target range, carrying out charge treatment or charge-before-discharge treatment on the one battery cluster, and correspondingly carrying out discharge-before-charge treatment or discharge treatment on the other battery cluster.
It should be noted that, the first battery cluster and the second battery cluster may be subjected to discharging treatment or charging treatment after being connected to the high-voltage main circuit, and if the first battery cluster needs to be subjected to charging treatment, and in particular, when the first battery cluster is charged through the high-voltage main circuit, in order to ensure stability of a pressure difference between the first battery cluster and the second battery cluster, the second battery cluster needs to be cut out of the high-voltage main circuit, and then the first battery cluster is cut into the high-voltage main circuit, so as to perform charging treatment on the first battery cluster.
In addition, the charge and discharge treatment process of the first battery cluster can be realized after the high-voltage main loop is not connected, namely, when the first battery cluster is not connected with the high-voltage main loop, the charge and discharge treatment can be carried out on the first battery cluster; the discharging process of the second battery cluster can also be realized after the second battery cluster is cut out of the high-voltage main circuit, namely, the discharging process can be executed after the second battery cluster is cut out of the high-voltage main circuit when the discharging operation is carried out on the second battery cluster.
It can be understood that before executing the battery cluster cut-in process, a target range value may be set according to the current state of charge of each battery cluster, and then charge and discharge processing is executed on each battery cluster according to the target range value, so that each battery cluster and the state of charge reach the target range value, and the last power consumption processing process of each battery cluster is the same.
In the present embodiment, the execution order, the number of executions, and the like of the charge and discharge processes of the first battery cluster and the second battery cluster are not limited.
Specifically, the implementation of the battery cluster cut-in method will be described in detail below by way of specific examples only.
For example, an energy storage system formed by connecting 3 battery clusters (a battery cluster 1, a battery cluster 2 and a battery cluster 3) in parallel is set; wherein, the battery cluster 1 is in a state of being disconnected from the high-voltage main circuit, namely, the high voltage is not connected, and the SOC of the battery cluster 1 is 20% (namely, 20% based on the average voltage of the battery cells); while both clusters 2 and 3 have been connected into the high voltage main circuit, i.e. in a high voltage connection state, and the current average SOC of clusters 2 and 3 is 28%.
If the battery cluster 1 is required to be connected into the high-voltage main circuit, a target range value is set to be 40% -50% (or the target range value is set to be 45%), then the battery clusters 2 and 3 are charged to be within a range of 40% -50%, for example, 45%, and then charging is stopped; disconnecting the battery clusters 2 and 3 from the high voltage main circuit; then the battery cluster 1 is singly connected into a high-voltage main loop, and after the battery cluster 1 is charged to 40% -50%, for example, 45%, the charging is stopped; and then the battery clusters 2 and 3 are connected into the high-voltage main circuit, so that the 3 battery clusters are connected into the high-voltage main circuit.
It should be noted that, when the target range value is set to 45%, there may be a certain error in the actual SOC calculation, that is, there may be a certain error in the calculation results of the actual SOC of the battery cluster 1 and the actual SOCs of the battery clusters 2 and 3, but the SOC calculation error in a certain range does not have a great influence on the overall scheme because 45% of the target range value is the middle value of the charge-discharge plateau value interval.
In another example, if 30% of the SOC of the battery cluster 1 to be cut into the high-voltage main circuit is set, the average SOC of the battery clusters 2 and 3 that have been cut into the high-voltage main circuit is 64%; if the battery cluster 1 is required to be connected to the high-voltage main loop, setting a target range value to be 40%; then, discharging the battery clusters 2 and 3 to a range of 30% -35%, such as 35%, and stopping discharging; charging the battery clusters 2 and 3 to a range of 35% -40%, such as 40%, and disconnecting the battery clusters 2 and 3 from the high-voltage main circuit to stop charging; then the battery cluster 1 is singly connected into a high-voltage main loop, and is charged to a range of 35-40%, such as 40%, and the charging is stopped; and then the battery clusters 2 and 3 are connected into the high-voltage main circuit, so that the 3 battery clusters are connected into the high-voltage main circuit.
In yet another example, if 30% of the SOC of the battery cluster 1 to be cut into the high-voltage main circuit is set, the average SOC of the battery clusters 2 and 3 that have been cut into the high-voltage main circuit is 80%; if the battery cluster 1 is required to be connected to the high-voltage main loop, setting a target range value to be 80%; disconnecting the battery clusters 2 and 3 from the high-voltage main circuit, and independently connecting the battery cluster 1 into the high-voltage main circuit, charging the battery clusters to 75-80%, such as 40%, and stopping charging; and then the battery clusters 2 and 3 are connected into the high-voltage main circuit, so that the 3 battery clusters are connected into the high-voltage main circuit.
In this embodiment, when the battery cluster to be cut in is switched into the energy storage system, the states of charge between the battery cluster to be cut in and the battery cluster in the high-voltage connection state are regulated and controlled, so that the states of charge of the first battery cluster and the second battery cluster are both in the target range of the charge-discharge platform period, and then the cut-in of the battery cluster is realized, so that the first battery cluster and the second battery cluster are ensured to be connected into the high-voltage main loop.
Referring to fig. 3, an embodiment of the present application further provides a battery cluster cutting device, which includes:
The calculating module 110 is configured to calculate states of charge of the first battery cluster and the second battery cluster, respectively, if a battery cluster cut-in requirement exists and it is determined that a pressure difference between the first battery cluster to be cut-in and the second battery cluster in the high-voltage main circuit is greater than a preset threshold;
The cut-in module 120 is configured to perform charge and discharge processing on the first battery cluster and/or the second battery cluster according to the charge state, and when the charge states of the first battery cluster and the second battery cluster are both within a target range of a charge and discharge platform period, enable the first battery cluster and the second battery cluster to be both connected to the high-voltage main circuit.
It will be appreciated that the battery cluster cutting device of the present embodiment corresponds to the battery cluster cutting method of the above embodiment, and the options in the above embodiment are also applicable to the present embodiment, so the description thereof will not be repeated here.
The application also provides a centralized energy storage system, and the specific existence form of the centralized energy storage system is not limited. The centralized energy storage system, illustratively, includes at least two battery clusters, a memory, and at least one processor. Wherein the memory stores a computer program, and the processor executes the computer program to cause the centralized energy storage system to execute the battery cluster cut-in method of the present application, wherein the method comprises: if the battery cluster cutting-in requirement exists, and the pressure difference between the first battery cluster to be cut-in and the second battery cluster in the high-voltage main loop is determined to be larger than a preset threshold value, respectively calculating the charge states of the first battery cluster and the second battery cluster; respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge states, and enabling the first battery cluster and the second battery cluster to be connected into a high-voltage main loop when the charge states of the first battery cluster and the second battery cluster are in a target range of a charge and discharge platform period; when the battery clusters to be cut in are switched into the energy storage system, the state of charge between the battery clusters to be cut in and the battery clusters in the high-voltage connection state is regulated, and when the battery clusters are in the target range of the charge-discharge platform period, the first battery cluster and the second battery cluster are both connected into the high-voltage main loop, so that safe and rapid cutting in of the battery clusters is realized.
The processor may be an integrated circuit chip with signal processing capabilities. The processor may be a general purpose processor including at least one of a central processing unit (Central Processing Unit, CPU), a graphics processor (Graphics Processing Unit, GPU) and a network processor (Network Processor, NP), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present application.
The Memory may be, but is not limited to, random access Memory (Random Access Memory, RAM), read Only Memory (ROM), programmable Read Only Memory (Programmable Read-Only Memory, PROM), erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc. The memory is used for storing a computer program, and the processor can correspondingly execute the computer program after receiving the execution instruction.
In addition, the present application also provides a computer storage medium for storing the computer program used in the above computer device, where the computer program implements the method for cutting in a battery cluster according to the above embodiment when executed on a processor, and the method includes: if the battery cluster cutting-in requirement exists, and the pressure difference between the first battery cluster to be cut-in and the second battery cluster in the high-voltage main loop is determined to be larger than a preset threshold value, respectively calculating the charge states of the first battery cluster and the second battery cluster; and respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge states, and enabling the first battery cluster and the second battery cluster to be connected into the high-voltage main loop when the charge states of the first battery cluster and the second battery cluster are in the target range of the charge and discharge platform period.
It will be appreciated that the options in the battery cluster cut-in method of the above embodiment are equally applicable to the present embodiment, and thus the description thereof will not be repeated here.
The computer storage medium may be a nonvolatile storage medium or a volatile storage medium. For example, the computer storage medium may include, but is not limited to,: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flow diagrams and block diagrams in the figures, which illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules or units in various embodiments of the application may be integrated together to form a single part, or the modules may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a smart phone, a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application.

Claims (10)

1. A method of cutting into a battery cluster, comprising:
If a battery cluster cutting-in requirement exists, and the pressure difference between a first battery cluster to be cut-in and a second battery cluster in a high-voltage main loop is determined to be larger than a preset threshold value, respectively calculating the charge states of the first battery cluster and the second battery cluster;
And respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, and enabling the first battery cluster and the second battery cluster to be connected into the high-voltage main loop when the charge states of the first battery cluster and the second battery cluster are in a target range of a charge and discharge platform period.
2. The battery cluster cut-in method according to claim 1, further comprising, before the charge and discharge processing is performed on the first battery cluster and/or the second battery cluster, respectively, according to the state of charge:
And setting a target range in a charge-discharge platform period according to the charge state, and respectively carrying out charge-discharge treatment on the first battery cluster and/or the second battery cluster according to the target range.
3. The battery cluster cut-in method according to claim 2, further comprising, prior to said charging process of the first battery cluster:
and cutting the second battery cluster out of the high-voltage main circuit, and cutting the first battery cluster into the high-voltage main circuit so as to carry out charging treatment.
4. The battery cluster cut-in method according to claim 2, wherein the performing charge and discharge processing on the first battery cluster and/or the second battery cluster according to the target range includes:
If the charge state of any battery cluster is larger than the maximum boundary value of the target range, discharging the corresponding battery cluster;
if the charge state of any battery cluster is smaller than the minimum boundary value of the target range, charging the corresponding battery cluster;
if the charge state of any battery cluster is within the target range, no processing is performed.
5. The battery cluster cut-in method of any one of claims 2-4, wherein if the state of charge of the first battery cluster is within the target range, the state of charge of the second battery cluster is not within the target range; and respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, wherein the charge and discharge treatment comprises the following steps:
If the state of charge of the second battery cluster is greater than the maximum boundary value of the target range, performing discharge treatment or charge-after-discharge treatment on the second battery cluster, so that the real-time state of charge of the second battery cluster is within the target range;
and if the charge state of the second battery cluster is smaller than the maximum boundary value of the target range, carrying out charge processing or charge-before-discharge processing on the second battery cluster, so that the real-time charge state of the second battery cluster is in the target range.
6. The battery cluster cut-in method of any one of claims 2-4, wherein if the state of charge of the second battery cluster is within the target range, the state of charge of the first battery cluster is not within the target range; and respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, wherein the charge and discharge treatment comprises the following steps:
If the charge state of the first battery cluster is greater than the maximum boundary value of the target range, performing discharge treatment or charge treatment after first discharge on the first battery cluster, so that the real-time charge state of the first battery cluster is in the target range;
And if the charge state of the first battery cluster is smaller than the maximum boundary value of the target range, carrying out charge processing or charge-before-discharge processing on the first battery cluster, so that the real-time charge state of the first battery cluster is in the target range.
7. The battery cluster cut-in method of any one of claims 2-4, wherein the state of charge of both the first and second battery clusters is not within the target range; and respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, wherein the charge and discharge treatment comprises the following steps:
If the charge states of the first battery cluster and the second battery cluster are both larger than the maximum boundary value of the target range, carrying out discharge treatment or charge treatment after pre-discharge on the first battery cluster and the second battery cluster;
if the charge states of the first battery cluster and the second battery cluster are smaller than the maximum boundary value of the target range, carrying out charging treatment or charging-then-discharging treatment on the first battery cluster and the second battery cluster;
And if the charge state of one battery cluster is smaller than the target range and the charge state of the other battery cluster is larger than the target range, carrying out charge processing or charge-before-discharge processing on the certain battery cluster, and correspondingly carrying out discharge-before-charge processing or discharge processing on the other battery cluster.
8. A battery cluster cut-in device, comprising:
The computing module is used for respectively computing the charge states of the first battery cluster and the second battery cluster when the battery cluster cutting-in requirement exists and the pressure difference between the first battery cluster to be cut-in and the second battery cluster in the high-voltage main loop is determined to be larger than a preset threshold value;
and the cut-in module is used for respectively carrying out charge and discharge treatment on the first battery cluster and/or the second battery cluster according to the charge state, and enabling the first battery cluster and the second battery cluster to be connected into the high-voltage main loop when the charge states of the first battery cluster and the second battery cluster are in a target range of a charge and discharge platform period.
9. A centralized energy storage system comprising at least two battery clusters, a memory storing a computer program, and at least one processor for executing the computer program to implement the battery cluster cut-in method of any one of claims 1-7.
10. A computer storage medium, characterized in that it stores a computer program which, when executed, implements the battery cluster cut-in method according to any one of claims 1-7.
CN202410340565.8A 2024-03-25 2024-03-25 Battery cluster cutting-in method and device and centralized energy storage system Pending CN118232472A (en)

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Applications Claiming Priority (1)

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