CN118244120A - Battery stack state of charge calculation method, device and centralized energy storage system - Google Patents

Battery stack state of charge calculation method, device and centralized energy storage system Download PDF

Info

Publication number
CN118244120A
CN118244120A CN202410352001.6A CN202410352001A CN118244120A CN 118244120 A CN118244120 A CN 118244120A CN 202410352001 A CN202410352001 A CN 202410352001A CN 118244120 A CN118244120 A CN 118244120A
Authority
CN
China
Prior art keywords
battery
charge
calculating
stack
residual
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
CN202410352001.6A
Other languages
Chinese (zh)
Inventor
高文凯
徐中华
施静辉
钱振华
吴占宽
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 CN202410352001.6A priority Critical patent/CN118244120A/en
Publication of CN118244120A publication Critical patent/CN118244120A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

The application relates to the field of energy storage, and discloses a method and a device for calculating a charge state of a cell stack and a centralized energy storage system. The method comprises the following steps: calculating the residual charge and discharge capacity of a plurality of parallel battery clusters used for forming the battery stack, and calculating the residual charge and discharge capacity of the battery stack according to the residual charge and discharge capacity of each battery cluster; and calculating the charge state of the battery stack according to the residual charge and discharge quantity of the battery stack. According to the embodiment of the application, the residual charge and discharge amounts of the battery stacks are calculated by calculating the residual charge and discharge amounts of a plurality of battery clusters forming the battery stacks, so that the charge state of the battery stacks is obtained by calculation, the charge states of all battery cells in the battery clusters are not required to be obtained, the calculation accuracy of the charge states of the battery stacks is improved, the accurate calculation of the chargeable and dischargeable amounts of the battery stacks can be synchronously realized, and the performance of an energy storage system is improved.

Description

Battery stack state of charge calculation method, 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 calculating a state of charge of a battery stack, and a centralized energy storage system.
Background
For the energy storage system, the detection accuracy of the charge state of the battery stack becomes an important index for influencing the running state of the energy storage system.
At present, the state of charge of the battery stack is generally calculated by simply taking the average value of the states of charge of the single batteries, or the whole battery stack is regarded as a single battery to carry out weighted calculation, but the premise of the calculation scheme is that each battery core needs to be ensured to have better consistency of the state of charge and the internal resistance, and in practical application, the unavoidable difference of the states of charge, the capacities of the battery cores and the consistency of the internal resistance exists inside each battery cluster, so that the calculation precision of the state of charge of the battery stack is not high, and the performance exertion of an energy storage system is influenced.
Disclosure of Invention
In a first aspect, the present application provides a method for calculating a state of charge of a battery stack, including:
calculating the residual charge and discharge capacity of a plurality of parallel battery clusters used for forming a battery stack, and calculating the residual charge and discharge capacity of the battery stack according to the residual charge and discharge capacity of each battery cluster;
And calculating the charge state of the battery stack according to the residual charge and discharge quantity of the battery stack.
In an alternative embodiment, before calculating the remaining charge and discharge amounts of the several parallel battery clusters used to form the battery stack, the method further includes:
Constructing a cell stack model, wherein the cell stack model comprises a plurality of cell clusters connected in parallel, and each cell cluster comprises a plurality of cells connected in series or connected in parallel first and then in series; the charge states and capacities of the battery cells are the same or different.
In an alternative embodiment, the remaining charge-discharge amount includes a remaining chargeable amount and a remaining dischargeable amount, and the calculating the remaining charge-discharge amount of the cell stack according to the remaining charge-discharge amount of each of the cell clusters includes:
Taking the product of the minimum value of the minimum residual chargeable amounts corresponding to all the battery clusters and the number of the battery clusters as the minimum residual chargeable amount of the battery stack;
And taking the product of the minimum value in the minimum residual dischargeable quantity corresponding to all the battery clusters and the quantity of the battery clusters as the minimum residual dischargeable quantity of the battery stack.
In an alternative embodiment, the calculating the state of charge of the battery stack according to the remaining charge and discharge capacity of the battery stack includes:
Acquiring the minimum remaining chargeable amount and the minimum remaining dischargeable amount of the battery stack;
And calculating the charge state of the battery stack according to the minimum residual chargeable amount and the minimum residual dischargeable amount.
In an alternative embodiment, the calculating the state of charge of the battery stack according to the minimum remaining chargeable amount and the minimum remaining dischargeable amount includes:
Calculating a sum between a minimum remaining chargeable amount and a minimum remaining dischargeable amount of the battery stack;
And taking the quotient between the minimum residual dischargeable quantity and the sum value as the charge state of the battery stack.
In an alternative embodiment, the calculating the remaining charge and discharge amounts of the several parallel battery clusters for constituting the battery stack includes:
Calculating the monomer charge maximum value in the same battery cluster, and calculating the residual chargeable and dischargeable quantity of each battery cluster based on the monomer charge maximum value of each battery cluster;
the calculating, based on the monomer charge maximum value of each battery cluster, the remaining chargeable and dischargeable amount of each battery cluster includes:
according to the maximum value of the single charge in the same battery cluster, calculating to obtain the minimum residual chargeable amount of the current battery cluster;
and calculating to obtain the minimum residual dischargeable quantity of the current battery cluster according to the minimum value of the single charge in the same battery cluster.
In an alternative embodiment, the calculating the remaining charge and discharge amounts of the several parallel battery clusters for constituting the battery stack includes:
Calculating a monomer charge maximum value in the same battery cluster and monomer cell capacity of a cell corresponding to the monomer charge maximum value;
Based on the monomer charge maximum value and the monomer cell capacity of each battery cluster, correspondingly calculating to obtain the residual chargeable and dischargeable quantity of each battery cluster;
The calculating, based on the monomer charge maximum value and the monomer cell capacity of each battery cluster, the remaining chargeable and dischargeable amount of each battery cluster includes:
Calculating to obtain the minimum residual chargeable amount of the current battery cluster according to the monomer charge maximum value in the same battery cluster and the monomer cell capacity of the corresponding cell of the monomer charge maximum value;
And calculating to obtain the minimum residual dischargeable quantity of the current battery cluster according to the monomer charge minimum value in the same battery cluster and the monomer cell capacity of the cell corresponding to the monomer charge minimum value.
In a second aspect, the present application provides a battery stack state of charge calculation apparatus, comprising:
The first calculation module is used for calculating the residual charge and discharge capacity of a plurality of parallel battery clusters forming the battery stack, and calculating the residual charge and discharge capacity of the battery stack according to the residual charge and discharge capacity of each battery cluster;
And the second calculation module is used for calculating the charge state of the battery stack according to the residual charge and discharge quantity of the battery stack.
In a third aspect, the present application provides a centralized energy storage system comprising at least one cell stack, a memory storing a computer program, and a processor for executing the computer program to implement the aforementioned cell stack state of charge calculation method.
In a fourth aspect, the present application provides a computer storage medium storing a computer program which, when executed, implements a method of calculating a state of charge of a battery stack according to the foregoing.
The embodiment of the application provides a method for calculating the charge state of a cell stack, which comprises the following steps: calculating the residual charge and discharge capacity of a plurality of parallel battery clusters used for forming the battery stack, and calculating the residual charge and discharge capacity of the battery stack according to the residual charge and discharge capacity of each battery cluster; and calculating the charge state of the battery stack according to the residual charge and discharge quantity of the battery stack. According to the embodiment of the application, the residual charge and discharge amounts of the battery pile are calculated by calculating the residual charge and discharge amounts of a plurality of battery clusters forming the battery pile, so that the charge state of the battery pile is calculated without acquiring the charge states of all battery cells in the battery clusters, the calculation process is simplified, the consistency difference of the charge states, the battery cell capacities and the internal resistances among the battery cells of each battery cluster is not considered, the calculation precision of the charge state of the battery pile is improved, the accurate calculation of the chargeable and dischargeable amounts of the battery pile can be synchronously realized, and the performance of an energy storage system is improved.
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 diagram of a first flow chart of a method for calculating a state of charge of a battery stack according to an embodiment of the application;
FIG. 2 is a schematic diagram of a second flow chart of a method for calculating a state of charge of a battery stack according to an embodiment of the application;
FIG. 3 is a schematic diagram of a third flow chart of a method for calculating a state of charge of a battery stack according to an embodiment of the application;
Fig. 4 is a schematic diagram showing a first configuration of a battery pack state of charge calculation device in 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.
State of charge (SOC), which reflects the remaining capacity of a battery, is defined numerically as the ratio of the remaining capacity to the battery capacity.
The application provides a method for calculating the charge state of a battery stack, which calculates the residual charge and discharge capacity of the battery stack only through the single charge maximum value and the single cell capacity of cells in a battery cluster, so as to calculate the charge state of the battery stack, simplify the calculation process and effectively improve the calculation precision of the charge state of the battery stack. In addition, the application can correspondingly calculate the chargeable and dischargeable quantity of the battery stack through the residual chargeable and dischargeable quantity of the battery stack, thereby correspondingly improving the calculation accuracy of the chargeable and dischargeable quantity of the battery stack.
Specifically, the method for calculating the state of charge of the battery stack will be described in detail; the method for calculating the charge state of the battery stack can be applied to equipment or a system with an energy storage function.
Referring to fig. 1, when implementing a process for calculating a state of charge of a battery stack, an embodiment of the present application specifically includes the following steps:
S10, calculating the residual charge and discharge amounts of a plurality of parallel battery clusters forming the battery stack, and calculating the residual charge and discharge amounts of the battery stack according to the residual charge and discharge amounts of the battery clusters.
S20, calculating the charge state of the battery stack according to the residual charge and discharge quantity of the battery stack.
In this embodiment, since the average voltages among the respective battery clusters connected in parallel are the same, the average states of charge among the respective battery clusters connected in parallel are also the same. Based on the above, the embodiment of the application correspondingly calculates the average charge state of the battery stack formed by each battery cluster by the average charge state of each battery cluster connected in parallel, so as to improve the accuracy and reliability of the charge state calculation of the battery stack.
It should be noted that, the method for calculating the state of charge of the battery stack in the present embodiment may be implemented based on a battery stack model, and further, before calculating the remaining charge and discharge amounts of each battery cluster, the embodiment of the present application may construct the battery stack model; the battery pile model can be a battery pile model of a centralized direct-current side parallel energy storage system, and the current charge state of the battery pile can be calculated more accurately based on the battery pile model.
Optionally, the battery stack model can be correspondingly provided with corresponding management modules for respectively managing the battery stacks, the battery clusters and the battery cells and correspondingly calculating the charge states of the battery stacks, the battery clusters and the battery cells; for example, the single battery management module is provided to manage the corresponding single battery, and can be used to calculate the state of charge of the corresponding single battery, the battery cluster management module is provided to manage the corresponding battery cluster, and can be used to calculate the state of charge of the corresponding battery cluster, and the battery stack management module is provided to manage the corresponding battery stack, and can be used to calculate the state of charge of the corresponding battery stack. The single battery management module, the battery cluster management module and the battery stack management module mutually transmit the acquired information such as voltage, current, charge state and the like through a communication system.
In an example, the constructed cell stack model comprises a plurality of parallel cell clusters, each cell cluster comprises a plurality of series-connected or first-parallel-then-series-connected cells; wherein, the charge states and the capacities of the battery cells are the same or different. Optionally, the number of the battery clusters and the number of the battery cells in each battery cluster may be set according to actual requirements, which is not limited in this embodiment; also, the difference between the average state of charge inside each battery cluster and the maximum and minimum states of charge has a well-defined physical constraint. Further, for a cell stack composed of each of the parallel cell clusters, the remaining charge amount of the cell stack depends on the cell with the smallest remaining dischargeable amount in all the cell clusters, and the remaining dischargeable amount depends on the cell with the smallest remaining dischargeable amount in all the cell clusters.
The embodiment of the application calculates the residual charge and discharge capacity of the battery stack by calculating the residual charge and discharge capacity of a plurality of parallel battery clusters forming the battery stack and correspondingly calculating the residual charge and discharge capacity of the battery stack based on the residual charge and discharge capacity of all the battery clusters, thereby obtaining the charge state of the battery stack.
In some examples, when calculating the remaining charge and discharge amounts of each battery cluster, the present embodiment may correspondingly calculate the remaining charge and discharge amounts of the battery cluster based on the charge states of the battery cells in the battery cluster, that is, calculate the remaining chargeable and dischargeable amounts of the current battery cluster based on the single charge maximum value (i.e., the charge state maximum value of the single battery cells) of the same battery cluster.
Specifically, calculating the monomer charge maximum value in the same battery cluster, and calculating the residual chargeable and dischargeable quantity of each battery cluster based on the monomer charge maximum value of each battery cluster; according to the maximum value of the single charge in the same battery cluster, calculating to obtain the minimum residual chargeable amount of the current battery cluster; and calculating to obtain the minimum residual dischargeable quantity of the current battery cluster according to the minimum value of the single charge in the same battery cluster.
In some examples, if the cell capacities of the cells in the same battery cluster are different and there is a large difference between the cell capacities, the difference between the cell capacities also affects the remaining charge and discharge amounts of the battery cluster; based on this, as a preferred scheme, the present embodiment can correspondingly calculate the remaining charge and discharge amount of the battery cluster by combining the charge state and the cell capacity of the battery cluster.
In some examples, as shown in fig. 2, the process of calculating the remaining charge and discharge capacity of the battery cluster according to the state of charge and the battery capacity in the same battery cluster in S10 may specifically include the following steps:
s11, calculating a monomer charge maximum value and a monomer cell capacity of a cell corresponding to the monomer charge maximum value in the same battery cluster;
and S12, correspondingly calculating the residual chargeable and dischargeable quantity of each battery cluster based on the monomer charge maximum value and the monomer cell capacity of each battery cluster.
It can be understood that the monomer charge maximum value in all the cells in the same battery cluster is calculated, the monomer cell capacity of the cell corresponding to the monomer charge maximum value in each battery cluster is calculated, and the residual chargeable and dischargeable amount of each battery cluster is calculated correspondingly based on the monomer charge maximum value and the monomer cell capacity of each battery cluster; according to the monomer charge maximum value in the same battery cluster and the monomer cell capacity of the corresponding cell of the monomer charge maximum value, calculating to obtain the minimum residual chargeable amount of the current battery cluster; and calculating to obtain the minimum residual dischargeable quantity of the current battery cluster according to the monomer charge minimum value in the same battery cluster and the monomer cell capacity of the corresponding cell of the monomer charge minimum value.
Exemplary, based on the stack model, a single charge value for each cell in each parallel battery cluster forming a stack is calculated, where the single charge value is the state of charge of a single cell. Further, determining a monomer charge maximum value in the same battery cluster according to the monomer charge value of each electric core in the same battery cluster; the monomer charge maximum value comprises a monomer charge maximum value and a monomer charge minimum value.
That is, the cell charge values of each cell in the same battery cluster are compared to determine the cell charge maximum and cell charge minimum in the battery cluster.
And then, respectively acquiring the single cell capacity of the cell corresponding to the single cell maximum value in each battery cluster, namely acquiring the single cell maximum value and the single cell capacity of the corresponding cell from each battery cluster. The capacity of a cell refers to a measure of the electrical energy stored by the cell, usually in ampere hours (Ah).
In general, assuming that the current output of the battery remains stable over the period of use, the cell capacity can be calculated using the following equation, regardless of the influence of the voltage variation on the capacity during the discharging of the battery: cell capacity (Ah) =battery current (a) ×time of use (hours); the battery current refers to average current output of the battery cell in a given time, and the service time refers to the time from the full-charge state to the completion of discharging of the battery cell. In practical applications, the capacity of the battery is often also affected by other factors, such as discharge rate, ambient temperature, etc. For certain types of battery cells, such as lithium ion batteries, the capacity may be affected by the rated voltage, and in this case, the cell capacity may be calculated using the following formula: cell capacity (Ah) =battery current (a) ×time of use (hours) ×rated voltage (V)/actual voltage (V); wherein, rated voltage refers to the nominal voltage of the battery cell: the actual voltage refers to the actual output voltage of the battery cell during discharge.
It should be noted that the above formula for calculating the cell capacity only provides an approximation, and the actual capacity may be affected by various factors, such as aging of the battery, the number of cycles, and the like. Therefore, in practical application, the calculation of the capacity of the battery cell may be performed by setting a corresponding calculation formula according to practical situations, which is not limited in this embodiment.
In addition, the state of charge of the battery cell can be specifically calculated according to the calculated battery cell capacity and the residual capacity, and the specific calculation process can also be set according to actual requirements, which is not limited in this embodiment.
It will be appreciated that the minimum remaining chargeable amount of each cell is correspondingly calculated from the maximum cell charge and cell capacity of each cell in the respective battery clusters within the stack. Wherein the minimum remaining chargeable amount of each cell is the product between the cell's cell charge maximum and the cell's capacity.
And correspondingly calculating the minimum residual dischargeable quantity of each cell according to the minimum single charge value and the single cell capacity of each cell in each cell cluster in the cell stack. The minimum residual dischargeable amount of each cell is the product of the minimum monomer charge value of the cell and the capacity of the single cell.
And then, according to the calculated minimum residual chargeable and dischargeable amounts of the battery cells in each battery cluster, correspondingly calculating the minimum residual chargeable and dischargeable amounts of the battery stack.
In an embodiment, the minimum value of the minimum residual chargeable amounts corresponding to the battery cells belonging to the same battery cluster is used as the minimum residual chargeable amount corresponding to the current battery cluster; and taking the minimum value in the minimum residual dischargeable quantity corresponding to each battery cell belonging to the same battery cluster as the minimum residual dischargeable quantity corresponding to the current battery cluster.
In addition, in some examples, the monomer charge value of each cell in the same battery cluster is not required to be acquired, but the monomer charge maximum value in the same battery cluster can be directly acquired, and then the minimum residual charge and discharge amount of the current battery cluster is calculated according to the monomer charge maximum value.
Further, the product of the minimum value of the minimum remaining chargeable amounts corresponding to all the battery clusters and the number of the battery clusters is taken as the minimum remaining chargeable amount of the battery stack; and taking the product of the minimum value in the minimum residual dischargeable quantity corresponding to all the battery clusters and the number of the battery clusters as the minimum residual dischargeable quantity of the battery stack.
It will be appreciated that the minimum value is selected from the minimum remaining dischargeable amounts of the individual cells within a battery cluster to characterize the minimum remaining dischargeable amount of the battery cluster, and the minimum value is selected from the minimum remaining dischargeable amounts and the minimum remaining dischargeable amounts of all the battery clusters, and the product of the minimum remaining dischargeable amounts and the number of the battery clusters contained in the battery stack is used to characterize the minimum remaining dischargeable amount and the minimum remaining dischargeable amount of the battery stack, respectively.
Further, the state of charge of the battery stack is calculated from the remaining charge and discharge amounts of the battery stack.
Specifically, as shown in fig. 3, the step S20 specifically includes the following steps:
S21, acquiring the calculated minimum residual chargeable and dischargeable quantity of the battery stack.
S22, calculating the charge state of the battery stack according to the minimum residual chargeable amount and the minimum residual dischargeable amount.
Wherein a sum value between the minimum remaining chargeable amount and the minimum remaining dischargeable amount of the battery stack can be calculated; and taking the quotient between the minimum residual dischargeable quantity and the sum value as the charge state of the battery stack. In addition, the cell capacity of one cell stack is the product of the sum of the minimum remaining chargeable amount and the minimum remaining dischargeable amount of the cell stack and the number of cell clusters contained in the cell stack.
Specifically, the implementation of the stack state of charge calculation method will be described in detail below by way of specific examples only.
For example, if one stack includes two parallel battery clusters (battery cluster 1 and battery cluster 2), several cells within each battery cluster are connected in series.
The average state of charge of the two battery clusters is calculated to be 52% based on the average voltages of the battery cells in the two battery clusters; the minimum value (namely the minimum state of charge) of the single charge of the battery cells in the battery cluster 1 is 40%, the battery cell capacity of the corresponding battery cells is 100Ah, and then the minimum residual dischargeable amount of the battery cluster 1 is 40Ah; the maximum value of the cell charge (i.e., the maximum state of charge) in the battery cluster 1 is 55%, the cell capacity of the corresponding cell is 105Ah, and further, the minimum remaining chargeable amount of the battery cluster 1 is 57.75Ah.
The minimum value of the single charge of the battery cells in the battery cluster 2 is 45%, the battery cell capacity of the corresponding battery cells is 95Ah, and further, the minimum residual dischargeable amount of the battery cluster 1 is 42.75Ah; the maximum value of the cell charge of the cell in the battery cluster 2 is 59%, the cell capacity of the corresponding cell is 100Ah, and further, the minimum remaining chargeable amount of the battery cluster 1 is 39Ah.
Based on this, the current minimum remaining dischargeable amount of the stack is 2×40ah=80ah; the current minimum remaining chargeable amount of the stack is 2 x 39 ah=78ah, and the cell capacity of the stack is 80+78=158A; and the state of charge of the stack is: 80/158= 50.63%.
According to the embodiment of the application, the residual charge and discharge capacity of the battery stack is calculated by the cell charge maximum values and the cell capacities of the plurality of battery clusters forming the battery stack, so that the charge state of the battery stack is calculated, the charge states of all the cells in the battery clusters are not required to be acquired to calculate the charge state of the battery stack, the calculation process is simplified, the consistency difference among the charge states, the cell capacities and the internal resistances of the cells of each battery cluster is not required to be considered, the calculation precision of the charge state of the battery stack is improved, the accurate calculation of the chargeable and dischargeable capacity of the battery stack can be synchronously realized, and the performance of an energy storage system is facilitated to be improved.
Referring to fig. 4, an embodiment of the present application further provides a device for calculating a state of charge of a battery stack, including:
a first calculation module 110, configured to calculate a remaining charge and discharge amount of a plurality of parallel battery clusters forming a battery stack, and calculate the remaining charge and discharge amount of the battery stack according to the remaining charge and discharge amount of each battery cluster;
And a second calculation module 120, configured to calculate a state of charge of the battery stack according to the remaining charge and discharge amounts of the battery stack.
It is understood that the stack state of charge calculation device of the present embodiment corresponds to the stack state of charge calculation method of the above embodiment, and the options in the above embodiment are equally applicable to the present embodiment, so the description thereof will not be repeated here.
The embodiment of the application also provides a centralized energy storage system, and the specific existing form of the centralized energy storage system is not limited. The centralized energy storage system comprises at least one cell stack, a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to enable the centralized energy storage system to execute the cell stack charge state calculation method of the application, and the method comprises the following steps: calculating the monomer charge maximum value and the monomer cell capacity of a plurality of parallel battery clusters used for forming a battery stack; calculating the residual charge and discharge capacity of the battery stack according to the monomer charge maximum value and the monomer cell capacity of each battery cluster; calculating the charge state of the battery stack according to the residual charge and discharge quantity; furthermore, the embodiment of the application calculates the residual charge and discharge capacity of the battery pile by calculating the cell charge maximum value and the cell capacity of a plurality of battery clusters forming the battery pile, so as to obtain the charge state of the battery pile, so that the charge state of the battery pile is calculated without acquiring the charge states of all cells in the battery clusters, the calculation process is simplified, the consistency difference among the charge states, the cell capacities and the internal resistances of the cells of each battery cluster is not considered, the calculation precision of the charge state of the battery pile is improved, the accurate calculation of the chargeable and dischargeable capacity of the battery pile can be synchronously realized, and the performance of an energy storage system is improved.
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.
Furthermore, the present application provides a computer storage medium for storing the computer program used in the above computer device, where the computer program, when executed on a processor, implements the method for calculating the state of charge of the cell stack according to the above embodiment, and the method includes: calculating the monomer charge maximum value and the monomer cell capacity of a plurality of parallel battery clusters used for forming a battery stack; calculating the residual charge and discharge capacity of the battery stack according to the monomer charge maximum value and the monomer cell capacity of each battery cluster; and calculating the charge state of the battery stack according to the residual charge and discharge quantity.
It will be appreciated that the options in the method for calculating the state of charge of the battery stack in 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 calculating a state of charge of a battery stack, comprising:
calculating the residual charge and discharge capacity of a plurality of parallel battery clusters used for forming a battery stack, and calculating the residual charge and discharge capacity of the battery stack according to the residual charge and discharge capacity of each battery cluster;
And calculating the charge state of the battery stack according to the residual charge and discharge quantity of the battery stack.
2. The method of calculating a state of charge of a battery according to claim 1, further comprising, before said calculating the remaining charge and discharge amounts of a plurality of parallel battery clusters for constituting the battery:
Constructing a cell stack model, wherein the cell stack model comprises a plurality of cell clusters connected in parallel, and each cell cluster comprises a plurality of cells connected in series or connected in parallel first and then in series; the charge states and capacities of the battery cells are the same or different.
3. The method of calculating a state of charge of a battery stack according to claim 1, wherein the remaining charge-discharge amount includes a remaining chargeable amount and a remaining dischargeable amount, and the calculating the remaining charge-discharge amount of the battery stack from the remaining charge-discharge amounts of the respective battery clusters includes:
Taking the product of the minimum value of the minimum residual chargeable amounts corresponding to all the battery clusters and the number of the battery clusters as the minimum residual chargeable amount of the battery stack;
And taking the product of the minimum value in the minimum residual dischargeable quantity corresponding to all the battery clusters and the quantity of the battery clusters as the minimum residual dischargeable quantity of the battery stack.
4. A method of calculating a state of charge of a battery stack according to any one of claims 1 to 3, wherein the calculating the state of charge of the battery stack from the remaining charge and discharge amounts of the battery stack includes:
Acquiring the minimum remaining chargeable amount and the minimum remaining dischargeable amount of the battery stack;
And calculating the charge state of the battery stack according to the minimum residual chargeable amount and the minimum residual dischargeable amount.
5. The method of calculating a state of charge of a battery stack according to claim 4, wherein the calculating the state of charge of the battery stack from the minimum remaining chargeable amount and the minimum remaining dischargeable amount includes:
Calculating a sum between a minimum remaining chargeable amount and a minimum remaining dischargeable amount of the battery stack;
And taking the quotient between the minimum residual dischargeable quantity and the sum value as the charge state of the battery stack.
6. A method of calculating a state of charge of a battery according to any one of claims 1 to 3, wherein the calculating the amount of charge and discharge remaining for a plurality of parallel battery clusters constituting the battery includes:
Calculating the monomer charge maximum value in the same battery cluster, and calculating the residual chargeable and dischargeable quantity of each battery cluster based on the monomer charge maximum value of each battery cluster;
the calculating, based on the monomer charge maximum value of each battery cluster, the remaining chargeable and dischargeable amount of each battery cluster includes:
according to the maximum value of the single charge in the same battery cluster, calculating to obtain the minimum residual chargeable amount of the current battery cluster;
and calculating to obtain the minimum residual dischargeable quantity of the current battery cluster according to the minimum value of the single charge in the same battery cluster.
7. A method of calculating a state of charge of a battery according to any one of claims 1 to 3, wherein the calculating the amount of charge and discharge remaining for a plurality of parallel battery clusters constituting the battery includes:
Calculating a monomer charge maximum value in the same battery cluster and monomer cell capacity of a cell corresponding to the monomer charge maximum value;
Based on the monomer charge maximum value and the monomer cell capacity of each battery cluster, correspondingly calculating to obtain the residual chargeable and dischargeable quantity of each battery cluster;
The calculating, based on the monomer charge maximum value and the monomer cell capacity of each battery cluster, the remaining chargeable and dischargeable amount of each battery cluster includes:
Calculating to obtain the minimum residual chargeable amount of the current battery cluster according to the monomer charge maximum value in the same battery cluster and the monomer cell capacity of the corresponding cell of the monomer charge maximum value;
And calculating to obtain the minimum residual dischargeable quantity of the current battery cluster according to the monomer charge minimum value in the same battery cluster and the monomer cell capacity of the cell corresponding to the monomer charge minimum value.
8. A stack state of charge calculation apparatus, comprising:
The first calculation module is used for calculating the residual charge and discharge capacity of a plurality of parallel battery clusters forming the battery stack, and calculating the residual charge and discharge capacity of the battery stack according to the residual charge and discharge capacity of each battery cluster;
And the second calculation module is used for calculating the charge state of the battery stack according to the residual charge and discharge quantity of the battery stack.
9. A centralized energy storage system comprising at least one cell stack, a memory storing a computer program, and a processor for executing the computer program to implement the method of cell stack state of charge calculation 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 stack state of charge calculation method according to any one of claims 1 to 7.
CN202410352001.6A 2024-03-26 2024-03-26 Battery stack state of charge calculation method, device and centralized energy storage system Pending CN118244120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410352001.6A CN118244120A (en) 2024-03-26 2024-03-26 Battery stack state of charge calculation method, device and centralized energy storage system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410352001.6A CN118244120A (en) 2024-03-26 2024-03-26 Battery stack state of charge calculation method, device and centralized energy storage system

Publications (1)

Publication Number Publication Date
CN118244120A true CN118244120A (en) 2024-06-25

Family

ID=91554906

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410352001.6A Pending CN118244120A (en) 2024-03-26 2024-03-26 Battery stack state of charge calculation method, device and centralized energy storage system

Country Status (1)

Country Link
CN (1) CN118244120A (en)

Similar Documents

Publication Publication Date Title
CN108957337B (en) Method and device for determining state of health of battery, storage medium and electronic equipment
CN111812531B (en) Battery state detection method, device and storage medium
CN109664795B (en) Battery pack passive equalization method and battery management system
CN108291944B (en) Battery management device
CN109964137B (en) Apparatus and method for estimating capacity retention rate of secondary battery
CN113111508B (en) Evaluation method, device and server for consistency of battery cells
CN112986842B (en) Method, device and equipment for estimating state of charge of battery
CN109991545B (en) Battery pack electric quantity detection method and device and terminal equipment
CN110967647B (en) Charge state correction method and device
CN112541260B (en) Battery equalization control method, system, storage medium and electronic equipment
JP5474993B2 (en) Method for determining the state of charge of a battery in the charge or discharge phase
CN112986841B (en) Method, device and equipment for estimating state of charge of battery
CN108061863A (en) Method and device for detecting battery, computer readable storage medium and battery management system
EP4198537A1 (en) Battery soh estimation device and method
CN117970158B (en) Method for determining battery state of health, vehicle and storage medium
CN117890798B (en) Battery remaining energy state estimation method and related device
CN111762053A (en) Control method and control system for charging of battery replacement
CN115684956A (en) Method, apparatus and computer program product for battery memory life estimation
CN115113049A (en) Method for determining initial value of battery SOC and related device
EP4109626A1 (en) State-of-charge cutoff method and apparatus, and control system and storage medium
CN115575829A (en) Lithium battery electric quantity display method and system
CN115639480B (en) Method and device for detecting health state of battery
CN112394290A (en) Method and device for estimating SOH of battery pack, computer equipment and storage medium
CN118244120A (en) Battery stack state of charge calculation method, device and centralized energy storage system
CN114966453A (en) Method and related device for acquiring remaining available energy of lithium battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination