CN114675193A - Allowable power estimation method, battery management system and storage medium - Google Patents

Allowable power estimation method, battery management system and storage medium Download PDF

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Publication number
CN114675193A
CN114675193A CN202011572286.2A CN202011572286A CN114675193A CN 114675193 A CN114675193 A CN 114675193A CN 202011572286 A CN202011572286 A CN 202011572286A CN 114675193 A CN114675193 A CN 114675193A
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Prior art keywords
type
allowable
battery
cell
determining
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CN202011572286.2A
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Chinese (zh)
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雷有玲
黄光美
徐广玉
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to CN202011572286.2A priority Critical patent/CN114675193A/en
Publication of CN114675193A publication Critical patent/CN114675193A/en
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    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The application provides a permissible power estimation method, a battery management system and a storage medium. The method comprises the following steps: acquiring a first charge state and a first temperature value of a first type of battery cell; acquiring a second charge state and a second temperature value of a second type of battery cell; determining a first allowable discharge current based on the first state of charge and the first temperature value; determining a second allowable discharge current based on the second state of charge and a second temperature value; and calculating the allowable discharge power of the battery pack based on the discharge current with the minimum value in the first allowable discharge current and the second allowable discharge current, the cut-off voltage of the first type battery cell, the number of battery cells of the first type battery cell, the cut-off voltage of the second type battery cell and the number of battery cells of the second type battery cell. Through the mode, when two types of battery cores are used in series, the maximum allowable discharge power of the battery pack is output on the premise of protecting the safety of the battery cores, and then the maximum discharge capacity of the battery cores is exerted.

Description

Allowable power estimation method, battery management system and storage medium
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method for estimating allowable power, a battery management system, and a storage medium.
Background
At present, as one of effective ways for energy conservation and emission reduction, enterprises invest a lot of resources to research and develop electric vehicles.
The power battery system is used as an energy storage unit Of the electric vehicle, the remaining capacity Of the power battery system needs to be monitored in real time in the charging and discharging processes, and the ratio Of the remaining capacity to the 100% fully charged battery capacity is the State Of Charge (SOC). In actual use, the SOC is mainly used as reference information for determination of battery protection, power estimation, and the like. However, most of the existing methods for power estimation combine the voltage of the battery cells to realize power estimation on the basis of the SOC, and the methods can only estimate the power of a single type of battery pack, and when the battery pack is formed by connecting different types of battery cells in series, the method cannot effectively determine the allowable power of the whole battery pack.
Disclosure of Invention
The embodiment of the application provides a method for estimating allowable power, a battery management system and a storage medium, so as to improve the problem of estimation accuracy of the allowable power of a battery pack containing different types of battery cells connected in series.
The invention is realized by the following steps:
in a first aspect, an embodiment of the present application provides a method for estimating allowable discharge power, including: acquiring a first charge state and a first temperature value of a first type of battery cell in a battery pack; acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack; determining a first allowable discharge current of the first type of battery cell based on the first state of charge and the first temperature value; determining a second allowable discharge current of the second type of battery cell based on the second state of charge and the second temperature value; and calculating the allowable discharge power of the battery pack based on the discharge current with the minimum value in the first allowable discharge current and the second allowable discharge current, the cut-off voltage of the first type battery cell, the number of battery cells of the first type, the cut-off voltage of the second type battery cell and the number of battery cells of the second type battery cell.
In the embodiment of the application, a first allowable discharge current of a first type battery cell is determined according to a current first state of charge and a first temperature value of the first type battery cell, a second allowable discharge current of a second type battery cell is determined according to a current second state of charge and a second temperature value of the second type battery cell, then a current with the minimum value of the two allowable discharge currents is used as an allowable discharge current of a battery pack, and finally, an allowable discharge power of the whole battery pack is calculated by combining cut-off voltages and the number of battery cells of the two types of battery cells.
In a second aspect, an embodiment of the present application provides a method for estimating allowable charging power, including: acquiring a first charge state and a first temperature value of a first type of battery cell in a battery pack; acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack; determining a first allowable charging current of the first type of battery cell based on the first state of charge and the first temperature value; determining a second allowable charging current of the second type of battery cell based on the second state of charge and the second temperature value; and calculating the allowable charging power of the battery pack based on the charging current with the minimum value in the first allowable charging current and the second allowable charging current, the open-circuit voltage of the first type battery cell, the number of battery cells of the first type battery cell, the open-circuit voltage of the second type battery cell and the number of battery cells of the second type battery cell.
In the embodiment of the application, a first allowable charging current of a first type battery cell is determined according to a current first state of charge and a first temperature value of the first type battery cell, a second allowable charging current of a second type battery cell is determined according to a current second state of charge and a second temperature value of the second type battery cell, then a current with the minimum value of the two allowable charging currents is used as an allowable charging current of a battery pack, and finally, the allowable charging power of the whole battery pack is calculated by combining open-circuit voltages and the number of battery cells of the two types of battery cells.
In a third aspect, an embodiment of the present application provides an electrical core control apparatus, including: the first acquisition module is used for acquiring a first charge state and a first temperature value of a first type battery cell in a battery pack, and acquiring a second charge state and a second temperature value of a second type battery cell in the battery pack; a first determination module, configured to determine a first allowable discharge current of the first type of cell based on the first state of charge and the first temperature value; determining a second allowable discharge current of the second type of battery cell based on the second state of charge and the second temperature value; and the calculation module is used for calculating the allowable discharge power of the battery pack based on the discharge current with the minimum value in the first allowable discharge current and the second allowable discharge current, the cut-off voltage of the first type of battery cell, the number of battery cells of the first type of battery cell, the cut-off voltage of the second type of battery cell and the number of battery cells of the second type of battery cell.
In a fourth aspect, an embodiment of the present application further provides an electrical core control device, including: the battery pack comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring a first charge state and a first temperature value of a first type battery cell in the battery pack; acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack; a first determining module, configured to determine a first allowable charging current of the first type of cell based on the first state of charge and the first temperature value; determining a second allowable charging current of the second type of battery cell based on the second state of charge and the second temperature value; and the calculation module is used for calculating the allowable charging power of the battery pack based on the charging current with the minimum value in the first allowable charging current and the second allowable charging current, the open-circuit voltage of the first type of battery cell, the number of battery cells of the first type of battery cell, the open-circuit voltage of the second type of battery cell and the number of battery cells of the second type of battery cell.
In a fifth aspect, an embodiment of the present application provides a battery management system, including: a processor and a memory, the processor and the memory connected; the memory is used for storing programs; the processor is configured to invoke a program stored in the memory to perform a method as provided in the above-described first aspect embodiment and/or in combination with some possible implementations of the above-described first aspect embodiment.
In a sixth aspect, an embodiment of the present application provides a battery management system, including: a processor and a memory, the processor and the memory connected; the memory is used for storing programs; the processor is configured to invoke a program stored in the memory to perform a method as provided in the above-described embodiment of the second aspect and/or in connection with some possible implementations of the above-described embodiment of the second aspect.
In a seventh aspect, an embodiment of the present application provides a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs the method as described in the foregoing first aspect embodiment and/or provided in combination with some possible implementations of the foregoing first aspect embodiment.
In an eighth aspect, embodiments of the present application provide a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, performs a method as provided in the above second aspect embodiment and/or in combination with some possible implementations of the above second aspect embodiment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating steps of a method for estimating allowable discharge power according to an embodiment of the present disclosure.
Fig. 3 is a schematic connection diagram of a battery management system and a battery pack according to an embodiment of the present disclosure.
Fig. 4 is a flowchart illustrating steps of a method for estimating allowable charging power according to an embodiment of the present disclosure.
Fig. 5 is a block diagram of a cell control device according to an embodiment of the present application.
Fig. 6 is a block diagram of another cell control device provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In view of the current power estimation, for a battery pack containing different types of cells connected in series, the allowable power of the whole battery pack cannot be effectively determined (wherein the allowable power of the battery pack includes the allowable discharging power and the allowable charging power). The present inventors have studied and found that the following examples are proposed to solve the above problems.
First, referring to fig. 1, a schematic structural diagram of a battery management system 100 applying an estimation method of allowable discharge power is provided in an embodiment of the present application. The battery management system 100 may be installed on an electric vehicle or an unmanned aerial vehicle. Structurally, the battery management system 100 may include a processor 110 and a memory 120.
The processor 110 and the memory 120 are electrically connected, directly or indirectly, to enable data transmission or interaction, for example, the components may be electrically connected to each other via one or more communication buses or signal lines. The above method includes at least one software module that may be stored in the memory 120 in the form of software or Firmware (Firmware) or solidified in the battery management system 100. The processor 110 is used to execute the executable modules stored in the memory 120. The processor 110 may execute the computer program upon receiving the execution instruction.
The processor 110 may be an integrated circuit chip having signal processing capabilities. The Processor 110 may also be a general-purpose Processor, for example, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a discrete gate or transistor logic device, a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present Application. Further, a general purpose processor may be a microprocessor or any conventional processor or the like.
The Memory 120 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), and an electrically Erasable Programmable Read-Only Memory (EEPROM). The memory 120 is used for storing a program, and the processor 110 executes the program after receiving the execution instruction.
It should be noted that the structure shown in fig. 1 is only an illustration, and the battery management system 100 provided in the embodiment of the present application may also have fewer or more components than that shown in fig. 1, or have a different configuration than that shown in fig. 1. Further, the components shown in fig. 1 may be implemented by software, hardware, or a combination thereof.
Referring to fig. 2, fig. 2 is a schematic flow chart of a method for estimating allowable discharge power according to an embodiment of the present application, and it should be noted that the method for estimating allowable discharge power according to the embodiment of the present application is not limited by the sequence shown in fig. 2 and the following description. The method comprises the following steps: step S101-step S105.
Step S101: the method comprises the steps of obtaining a first state of charge and a first temperature value of a first type of battery cell in a battery pack.
Step S102: and acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack.
Step S103: and determining a first allowable discharge current of the first type of battery cell based on the first state of charge and the first temperature value.
Step S104: and determining a second allowable discharge current of the second type battery cell based on the second state of charge and the second temperature value.
Step S105: and calculating the allowable discharge power of the battery pack based on the discharge current with the minimum value in the first allowable discharge current and the second allowable discharge current, the cut-off voltage of the first type battery cell, the number of battery cells of the first type battery cell, the cut-off voltage of the second type battery cell and the number of battery cells of the second type battery cell.
In summary, in the embodiment of the present application, a first allowable discharge current of a first type of battery cell is determined according to a current first state of charge and a first temperature value of the first type of battery cell, a second allowable discharge current of a second type of battery cell is determined according to a current second state of charge and a second temperature value of the second type of battery cell, then a current with a minimum value of the two allowable discharge currents is used as an allowable discharge current of a battery pack, and finally an allowable discharge power of the entire battery pack is calculated by combining a cutoff voltage and the number of battery cells of the two types of battery cells.
The whole process of the above allowable discharge power estimation method is described below with reference to specific examples.
In steps S101 and S102, the battery management system is electrically connected to the battery pack. Specifically, referring to fig. 3, the battery management system is electrically connected to the first type battery cell and the second type battery cell respectively. The battery management system acquires a first charge state and a first temperature value of a first type battery cell in real time, and acquires a second charge state and a second temperature value of a second type battery cell in the battery pack in real time.
The surface temperature of the battery cell can be used as the temperature of the battery cell, and the temperature sensor for acquiring the temperature value can be arranged on the surface of the battery cell.
Illustratively, the battery management system obtains a first state of charge of a first type of battery cell in real time as 80%, and the first temperature value is 3 ℃; the second state of charge of the second type of battery cell, which is obtained by the battery management system in real time, is 60%, and the first temperature value is 5 ℃.
The battery cell types can include, but are not limited to, a lithium cobalt oxide battery cell, a lithium nickel cobalt manganese battery cell, and a lithium iron phosphate battery cell, for example, the first battery cell can be the lithium cobalt oxide battery cell, the second battery cell can be the lithium nickel cobalt manganese battery cell, for example, the first battery cell can be the lithium iron phosphate battery cell, and the second battery cell can be the lithium cobalt oxide battery cell, and therefore, the application is not limited.
In steps S103 and S104, the allowable discharge current of the battery cell determined based on the state of charge and the temperature value may be obtained by a table lookup. For example, a discharge experiment is performed on the battery cell in advance to form a current two-dimensional table. The current two-dimensional meter comprises the types of the battery cells, the current charge state of the battery cells, the battery cell temperature and the allowable discharge current. In this embodiment of the application, a discharge experiment may be performed on the first type of battery cell in advance to obtain a current two-dimensional table of the first type of battery cell, and a discharge experiment may be performed on the second type of battery cell to obtain a current two-dimensional table of the second type of battery cell. Then storing the current two-dimensional meter of the first type of battery cell and the current two-dimensional meter of the second type of battery cell in a battery management system, wherein after the battery management system obtains a first charge state and a first temperature value of the first type of battery cell, a first allowable discharge current can be directly searched in the current two-dimensional meter of the first type of battery cell; after acquiring a second state of charge and a second temperature value of the second type of cell, the battery management system may directly find out a second allowable discharge current in the current two-dimensional table of the second type of cell.
Of course, the battery management system may directly store the corresponding relationship among the state of charge, the cell temperature, and the allowable discharge current, and the present application is not limited thereto.
In order to enable the determined allowable discharge current to meet the use condition of the battery core and improve the accuracy of the determined allowable discharge power of the battery pack, in the embodiment of the application, the aging degree of the battery core is also considered comprehensively when the allowable discharge current is determined. That is, step S103 specifically includes: determining a first initial allowable discharge current of the first type of battery cell based on the first state of charge and the first temperature value; and calculating the first allowable discharge current based on the first initial allowable discharge current and the aging coefficient of the first type battery cell. Step S104 specifically includes: determining a second initial allowable discharge current of the second type of battery cell based on the second state of charge and the second temperature value; and calculating the second allowable discharge current based on the second initial allowable discharge current and the aging coefficient of the second type battery cell.
It is understood that the first initial allowable discharge current may be a table-look-up current value obtained by a two-dimensional table of currents of the first-type cells, and the aging factor of the first-type cells is related to the current usage duration of the first-type cells. It should be noted that, the battery cell is subjected to an aging test when being shipped from a factory, and then the aging coefficients corresponding to the battery cell under different service durations are obtained. For example, the aging factor may have a value of 0.8 or 0.9. And finally, multiplying the first initial allowable discharge current by the corresponding aging coefficient to obtain the first allowable discharge current. Correspondingly, the second initial allowable discharge current may also be a table-lookup current value obtained through a current two-dimensional table of the second-type cell, and the aging factor of the second-type cell is related to the current usage duration of the second-type cell. For example, the aging factor may have a value of 0.6 or 0.9. And finally, multiplying the second initial allowable discharge current by the corresponding aging coefficient to obtain the second allowable discharge current.
After the first allowable discharge current of the first kind of cell and the second allowable discharge current of the second kind of cell are obtained, the allowable discharge power included in the battery may be calculated through step S105. When the allowable discharge power of the battery pack is calculated, the allowable discharge current of the battery pack is a discharge current having the smallest value among the first allowable discharge current and the second allowable discharge current. The specific formula for calculating the allowable discharge power of the battery pack is as follows:
the allowable discharge power of the battery pack is the allowable discharge current of the battery pack (cutoff voltage of the first type of battery cell + cutoff voltage of the second type of battery cell + the number of battery cells of the second type of battery cell);
the allowable discharge current of the battery pack is Min (the first allowable discharge current and the second allowable discharge current).
Min in the above equation is set to be small, and the cutoff voltage in the above equation is set in advance depending on the type of the battery cell, and the cutoff voltages of different types of battery cells are different.
It should be noted that, the above is only descriptions of two types of battery cells, and the allowable discharge power estimation method provided in the embodiment of the present application is also applicable to three types of battery cells and four types of battery cells.
It should be noted that, in the use process of the battery pack, the power may change along with the use of the battery pack, and in order to make the power fluctuation of each update smaller and improve the stability of the device using the battery pack in operation, in the embodiment of the present application, the allowable discharge power of the whole battery pack is dynamically adjusted based on the voltage change conditions of the two types of battery cells.
Specifically, the adjusting process comprises: acquiring a first voltage value of a first type of battery cell; acquiring a second voltage value of the second type of battery cell; and determining the adjusted discharge power of the battery pack based on the voltage value, and updating the allowable discharge power of the battery pack to the discharge power with the minimum value in the adjusted discharge power.
That is, in the above process, after the battery management system obtains the first voltage value of the first type of battery cell in real time, the first adjusted discharge power of the battery pack is determined based on the first voltage value. And after the battery management system acquires a second voltage of the second type of battery cell in real time, determining a second adjustment discharge power of the battery pack based on the second voltage value. Accordingly, the allowable discharge power of the battery pack is updated to the discharge power having the minimum value among the first adjusted discharge power and the second adjusted discharge power.
Optionally, determining the adjusted discharge power of the battery pack based on the voltage value comprises: judging whether the voltage value is smaller than a preset adjusting threshold value or not; when the voltage value is not less than the preset adjusting threshold value, the allowable discharging power of the battery pack is used as the adjusting discharging power; when the voltage value is smaller than a preset adjusting threshold value, determining the reduction ratio of the allowable discharge power of the battery pack; the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared with the preset adjustment threshold value; the adjusted discharge power is determined based on the reduction ratio and the allowable discharge power of the battery pack.
The preset adjustment threshold may be determined according to different types of battery cells, for example, when the battery cell is a lithium battery cell, the preset adjustment threshold may be 3.2V; when the battery cell is another type of battery cell, the preset adjustment threshold may be 3.6V, 4V, or the like, and the application is not limited thereto.
It should be noted that, when the voltage value is not less than the preset adjustment threshold, it indicates that the state of the battery cell is good (e.g., the state of charge is good) at this time, and the allowable discharge power of the battery pack is used as the adjustment discharge power at this time, so that the battery pack can continuously output the maximum power, and further, the maximum discharge capacity of the battery cell is exerted.
In the embodiment of the application, when the current allowable discharge power is reduced, a reduction ratio of the allowable discharge power of the battery pack is determined based on a reduction ratio of the voltage value to the preset adjustment threshold, and then the discharge power is determined and adjusted according to the reduction ratio and the allowable discharge power of the battery pack. For example, when the battery pack is applied to an electric vehicle, the stability of the electric vehicle can be improved through the dynamic adjustment process.
For example, assuming that the preset adjustment threshold is 3V, the current voltage value is 2.8V; the allowable discharge power of the battery pack is 30W; the voltage value may be decreased by (2.8-3)/3-1/15 compared to the preset adjustment threshold. Since the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared to the preset adjustment threshold, the reduction ratio of the allowable discharge power of the battery pack is also 1/15. Then, the discharge power is adjusted according to the reduction ratio and the allowable discharge power of the battery pack, and finally the discharge power is adjusted to be 30 x (1-1/15) ═ 28W.
In other embodiments, the reduction ratio of the allowable discharging power of the battery pack may be equal to the reduction ratio of the voltage value compared to the preset adjustment threshold multiplied by the preset value. The preset value may be one half or one third, and the application is not limited thereto.
Optionally, when the voltage value is smaller than the preset adjustment threshold, determining the adjusted discharge power of the battery pack based on the voltage value may further be: when the voltage value is smaller than a preset adjustment threshold value and is larger than the cut-off voltage of the electric core corresponding to the voltage value, determining the reduction ratio of the allowable discharge power of the battery pack; the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared with the preset adjustment threshold value; or when the voltage value is smaller than the preset adjustment threshold value and the voltage value is smaller than the cut-off voltage of the electric core corresponding to the voltage value, determining the reduction ratio of the allowable discharge power of the battery pack; the reduction proportion of the allowable discharge power of the battery pack is the same as the reduction proportion of the cut-off voltage of the battery cell corresponding to the voltage value compared with a preset adjustment threshold value; the adjusted discharge power is determined based on the reduction ratio and the allowable discharge power of the battery pack.
It should be noted that, in the above-mentioned scheme, an adjustment voltage is also set on the basis of the preset adjustment threshold, and the adjustment voltage is a cut-off voltage corresponding to the battery cell. That is, when the obtained voltage value is greater than the cut-off voltage and less than the preset adjustment threshold, the reduction ratio of the allowable discharge power of the battery pack is determined according to the method in the foregoing embodiment, and the adjustment discharge power is determined according to the allowable discharge power of the battery pack with the reduction ratio. And when the voltage value is smaller than the cut-off voltage of the battery core, determining the reduction proportion of the cut-off voltage to a preset adjustment threshold value as the reduction proportion of the allowable discharge power of the battery pack, and determining and adjusting the discharge power according to the allowable discharge power of the battery pack with the reduction proportion.
For example, assuming that the preset adjustment threshold is 3V, the cut-off voltage corresponding to the battery cell is 2.8V; the allowable discharge power of the battery pack is 30W; the current voltage value is 2.6V, and since the current voltage value is smaller than the cut-off voltage, the reduction ratio of the current voltage value to the preset adjustment threshold value may be (2.8-3)/3-1/15. Since the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the cut-off voltage compared to the preset adjustment threshold, the reduction ratio of the allowable discharge power of the battery pack is also 1/15. Then, the discharge power is adjusted according to the reduction ratio and the allowable discharge power of the battery pack, and finally the discharge power is adjusted to be 30 x (1-1/15) ═ 28W.
In summary, when the voltage value of the battery cell is smaller than the preset adjustment threshold and larger than the cut-off voltage of the battery cell, the reduction ratio of the allowable discharge power of the battery pack is determined based on the reduction ratio of the voltage value to the preset adjustment threshold, and then the adjustment discharge power is determined according to the reduction ratio and the allowable discharge power of the battery pack. When the voltage value of the battery core is smaller than the cut-off voltage of the battery core, the reduction proportion of the allowable discharge power of the battery pack is determined based on the reduction proportion of the cut-off voltage compared with the preset adjustment threshold, and then the adjustment discharge power is determined according to the reduction proportion and the allowable discharge power of the battery pack.
Based on the same inventive concept, the embodiment of the present application further provides a battery management system using the method for estimating the allowable charging power. The specific structure of the system is the same as that shown in fig. 1, and therefore, the structure of the battery management system to which the allowable charging power estimation method is applied may be described with reference to the foregoing embodiment, which is not intended to limit the present application.
Referring to fig. 4, the allowable charging power estimation method includes: step S201-step S205.
Step S201: the method comprises the steps of obtaining a first state of charge and a first temperature value of a first type of battery cell in a battery pack.
Step S202: and acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack.
Step S203: and determining a first allowable charging current of the first type of battery cell based on the first state of charge and the first temperature value.
Step S204: and determining a second allowable charging current of the second type battery cell based on the second state of charge and the second temperature value.
Step S205: and calculating the allowable charging power of the battery pack based on the charging current with the minimum value in the first allowable charging current and the second allowable charging current, the open-circuit voltage of the first type of battery cell, the number of battery cells of the first type of battery cell, the open-circuit voltage of the second type of battery cell and the number of battery cells of the second type of battery cell.
In the embodiment of the application, a first allowable charging current of a first type battery cell is determined according to a current first state of charge and a first temperature value of the first type battery cell, a second allowable charging current of a second type battery cell is determined according to a current second state of charge and a second temperature value of the second type battery cell, then a current with the minimum value of the two allowable charging currents is used as an allowable charging current of a battery pack, and finally, the allowable charging power of the whole battery pack is calculated by combining open-circuit voltages and the number of battery cells of the two types of battery cells.
The whole process of the above allowable charging power estimation method is described below with reference to specific examples.
The steps S201 to S202 are similar to the steps S101 and S102 in the allowable discharging power estimation method in the foregoing embodiment, and for avoiding redundancy, repeated description is omitted, and the same parts may be referred to each other.
In steps S203 and S204, the allowable charging current of the battery cell determined based on the state of charge and the temperature value may be obtained by a table lookup. For example, a battery cell is subjected to a charging experiment in advance to form a current two-dimensional table. The current two-dimensional meter comprises the types of the battery cells, the current charge state of the battery cells, the battery cell temperature and allowable charging current.
In this embodiment of the application, a charging experiment may be performed on the first type of battery cell in advance to obtain a current two-dimensional table of the first type of battery cell, and a charging experiment may be performed on the second type of battery cell to obtain a current two-dimensional table of the second type of battery cell. Then storing the current two-dimensional meter of the first type of battery cell and the current two-dimensional meter of the second type of battery cell in a battery management system, wherein after the battery management system obtains a first charge state and a first temperature value of the first type of battery cell, a first allowable charging current can be directly searched in the current two-dimensional meter of the first type of battery cell; after acquiring the second state of charge and the second temperature value of the second kind of cell, the battery management system can directly find out the second allowable charging current in the current two-dimensional table of the second kind of cell.
Of course, the battery management system may directly store the corresponding relationship between the state of charge, the cell temperature, and the allowable charging current, and the present application is not limited thereto.
In order to enable the determined allowable charging currents to respectively accord with the use conditions of the battery cores and improve the accuracy of the determined allowable charging power of the battery pack, in the embodiment of the application, the aging degree of the battery cores is comprehensively considered when the allowable charging currents are determined. That is, step S203 specifically includes: determining a first initial allowable charging current of the first type of battery cell based on the first state of charge and the first temperature value; and calculating the first allowable charging current based on the first initial allowable charging current and the aging coefficient of the first type of battery cell. Step S204 specifically includes: determining a second initial allowable charging current of the second type of battery cell based on the second state of charge and the second temperature value; and calculating the second allowable charging current based on the second initial allowable charging current and the aging coefficient of the second type battery cell.
It is understood that the first initial allowable charging current may be a table-look-up current value obtained by a two-dimensional table of currents of the first-type cells, and the aging factor of the first-type cells is related to the current usage duration of the first-type cells. It should be noted that, the battery cell is subjected to an aging test when being shipped from a factory, and then the aging coefficients corresponding to the battery cell under different service durations are obtained. For example, the aging factor may have a value of 0.8 or 0.9. And finally, multiplying the first initial allowable charging current by the corresponding aging coefficient to obtain the first allowable charging current. Correspondingly, the second initial allowable charging current may also be a table-lookup current value obtained through a current two-dimensional table of the second-type cell, and the aging factor of the second-type cell is related to the current usage duration of the second-type cell. For example, the aging factor may have a value of 0.6 or 0.9. And finally, multiplying the second initial allowable charging current by the corresponding aging coefficient to obtain the second allowable charging current.
After the first allowable charging current of the first kind of cell and the second allowable charging current of the second kind of cell are obtained, the allowable charging power included in the battery may be calculated through step S205. It should be noted that, when calculating the allowable charging power of the battery pack, the allowable charging current of the battery pack is the charging current with the minimum value among the first allowable charging current and the second allowable charging current. The specific formula for calculating the allowable charging power of the battery pack is as follows:
the allowable charging power of the battery pack is the allowable charging current of the battery pack (open circuit voltage of the first type of battery cell + open circuit voltage of the second type of battery cell + core number of the second type of battery cell);
the allowable charging current of the battery pack is Min (the first allowable charging current and the second allowable charging current).
The open circuit voltage is a terminal voltage of the battery in an open circuit state. The open circuit voltage is related to the type of the battery cell and the current state of charge. After the state of charge of the battery cell is obtained, the battery management system may obtain the open-circuit voltage of the battery cell through a relationship curve corresponding to the battery cell (where the relationship curve is a curve that is predetermined to represent the open-circuit voltage and the state of charge of the battery cell). For example, after the first state of charge of the first type of cell is obtained, the open-circuit voltage of the first type of cell is determined based on the relationship curve of the first type of cell. After the second state of charge of the second-type cell is obtained, the open-circuit voltage of the second-type cell is determined based on the relationship curve of the second-type cell.
In order to enable the determined open-circuit voltages to meet the use conditions of the battery cells and improve the accuracy of the determined allowable charging power of the battery pack, in the embodiment of the application, the aging degree of the battery cells is also comprehensively considered when the open-circuit voltages are determined. That is, the open circuit voltage of the first kind cell is determined by the steps including: determining an initial open-circuit voltage of the first type of cell based on the first state of charge; the open-circuit voltage of the first-type cell is determined based on the initial open-circuit voltage of the first-type cell and the aging coefficient of the first-type cell. Determining an open circuit voltage of a second type of cell by: determining an initial open-circuit voltage of the second type of cell based on the second state of charge; and determining the open-circuit voltage of the second type battery cell based on the initial open-circuit voltage of the second type battery cell and the aging coefficient of the second type battery cell.
It is understood that the initial open circuit voltage of the first type cell may be determined by a relationship curve of the first type cell, and the aging coefficient of the first type cell is related to the current usage duration of the first type cell. And finally, multiplying the initial open-circuit voltage of the first-kind battery cell by the corresponding aging coefficient to obtain the open-circuit voltage of the first-kind battery cell. Accordingly, the initial open-circuit voltage of the second-type cell may be determined by a relationship curve of the second-type cell, and the aging factor of the second-type cell is related to the current usage duration of the second-type cell. And finally, multiplying the initial open-circuit voltage of the second-kind battery cell by the corresponding aging coefficient to obtain the open-circuit voltage of the second-kind battery cell.
It should be noted that, the above is only descriptions of two types of battery cells, and the allowable charging power estimation method provided in the embodiment of the present application is also applicable to three types of battery cells and four types of battery cells.
It is to be understood that the battery management system provided in the embodiment of the present application may also apply the allowable discharge power estimation method and the allowable charge power estimation method at the same time, and the present application is not limited thereto.
Referring to fig. 5, based on the same inventive concept, an embodiment of the present application further provides a battery cell control apparatus 300, which includes a first obtaining module 301, a first determining module 302, and a calculating module 303.
The first obtaining module 301 is configured to obtain a first state of charge and a first temperature value of a first type of electric core in a battery pack, and obtain a second state of charge and a second temperature value of a second type of electric core in the battery pack.
The first determining module 302 is configured to determine a first allowable discharge current of the first type of cell based on the first state of charge and the first temperature value; and determining a second allowable discharge current of the second type of battery cell based on the second state of charge and the second temperature value.
The calculating module 303 is configured to calculate the allowable discharge power of the battery pack based on the discharge current with the smallest value among the first allowable discharge current and the second allowable discharge current, the cut-off voltage of the first kind of battery cell, the number of battery cells of the first kind of battery cell, the cut-off voltage of the second kind of battery cell, and the number of battery cells of the second kind of battery cell.
Optionally, the first determining module 302 is specifically configured to determine a first initial allowable discharge current of the first kind of cell based on the first state of charge and the first temperature value; calculating the first allowable discharge current based on the first initial allowable discharge current and the aging coefficient of the first type of battery cell; determining a second initial allowable discharge current of the second type of battery cell based on the second state of charge and the second temperature value; and calculating the second allowable discharge current based on the second initial allowable discharge current and the aging coefficient of the second type of battery cell.
Optionally, the apparatus further comprises: a second acquisition module 304, a second determination module 305, and an update module 306.
The second obtaining module 304 is configured to obtain a first voltage value of the first type of cell; and acquiring a second voltage value of the second kind of battery cell.
A second determining module 305, configured to determine an adjusted discharge power of the battery pack based on the voltage value, wherein the second determining module is specifically configured to determine a first adjusted discharge power of the battery pack based on the first voltage value; and determining a second adjusted discharge power of the battery pack based on the second voltage value.
The updating module 306 is configured to update the allowable discharging power of the battery pack to a discharging power with a minimum value of the first adjusted discharging power and the second adjusted discharging power.
Optionally, the second determining module 305 is specifically configured to use the allowable discharging power of the battery pack as the adjusted discharging power when the voltage value is not less than a preset adjustment threshold.
Optionally, the second determining module 305 is specifically configured to determine a reduction ratio of the allowable discharge power of the battery pack when the voltage value is smaller than the preset adjustment threshold; wherein, the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared with the preset adjustment threshold value; determining the adjusted discharge power based on the reduction ratio and an allowable discharge power of the battery pack.
Optionally, the second determining module 305 is specifically configured to determine a reduction ratio of the allowable discharge power of the battery pack when the voltage value is smaller than the preset adjustment threshold and is greater than the cut-off voltage of the battery cell corresponding to the voltage value; wherein, the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared with the preset adjustment threshold value; or when the voltage value is smaller than the preset adjustment threshold value and the voltage value is smaller than the cut-off voltage of the electric core corresponding to the voltage value, determining the reduction ratio of the allowable discharge power of the battery pack; the reduction proportion of the allowable discharge power of the battery pack is the same as the reduction proportion of the cut-off voltage of the battery cell corresponding to the voltage value compared with the preset adjustment threshold value; determining the adjusted discharge power based on the reduction ratio and an allowable discharge power of the battery pack.
Referring to fig. 6, based on the same inventive concept, an embodiment of the present application further provides a cell control apparatus 400, which includes an obtaining module 401, a first determining module 402, and a calculating module 403.
The acquiring module 401 is configured to acquire a first state of charge and a first temperature value of a first type of battery cell in a battery pack; and acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack.
A first determining module 402, configured to determine a first allowable charging current of the first type of cell based on the first state of charge and the first temperature value; and determining a second allowable charging current of the second type of cell based on the second state of charge and the second temperature value.
A calculating module 403, configured to calculate an allowable charging power of the battery pack based on a charging current with a minimum value among the first allowable charging current and the second allowable charging current, the open-circuit voltage of the first kind of battery cell, the number of battery cells of the first kind of battery cell, the open-circuit voltage of the second kind of battery cell, and the number of battery cells of the second kind of battery cell.
Optionally, the first determining module 402 is specifically configured to determine a first initial allowable charging current of the first kind of cell based on the first state of charge and the first temperature value; calculating the first allowable charging current based on the first initial allowable charging current and the aging coefficient of the first type of battery cell; determining a second initial allowable charging current of the second type of battery cell based on the second state of charge and the second temperature value; and calculating the second allowable charging current based on the second initial allowable charging current and the aging coefficient of the second type of battery cell.
Optionally, the apparatus further comprises: a second determination module 404.
The second determining module 404 is configured to determine an initial open-circuit voltage of the first kind of cells based on the first state of charge; determining an open-circuit voltage of the first type of cell based on an initial open-circuit voltage of the first type of cell and an aging coefficient of the first type of cell; and determining an initial open circuit voltage of the second type of cell based on the second state of charge; determining an open-circuit voltage of the second-type cell based on the initial open-circuit voltage of the second-type cell and the aging coefficient of the second-type cell.
It should be noted that, as those skilled in the art can clearly understand, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Based on the same inventive concept, the present application further provides a storage medium, on which a computer program is stored, and when the computer program is executed, the computer program can perform the method provided in the foregoing embodiments.
The storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Furthermore, the functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (22)

1. An allowable discharge power estimation method, comprising:
acquiring a first charge state and a first temperature value of a first type of battery cell in a battery pack;
acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack;
determining a first allowable discharge current of the first type of battery cell based on the first state of charge and the first temperature value;
determining a second allowable discharge current of the second type of battery cell based on the second state of charge and the second temperature value;
And calculating the allowable discharge power of the battery pack based on the discharge current with the minimum value in the first allowable discharge current and the second allowable discharge current, the cut-off voltage of the first type battery cell, the number of battery cells of the first type, the cut-off voltage of the second type battery cell and the number of battery cells of the second type battery cell.
2. The method of claim 1, wherein determining the first allowable discharge current for the first cell type based on the first state of charge and the first temperature value comprises:
determining a first initial allowable discharge current of the first type of cell based on the first state of charge and the first temperature value;
calculating the first allowable discharge current based on the first initial allowable discharge current and the aging coefficient of the first type of battery cell;
determining a second allowable discharge current of the second type of cell based on the second state of charge and the second temperature value, including:
determining a second initial allowable discharge current of the second type of cell based on the second state of charge and the second temperature value;
and calculating the second allowable discharge current based on the second initial allowable discharge current and the aging coefficient of the second type of battery cell.
3. The method of claim 1, further comprising:
acquiring a first voltage value of the first type of battery cell;
acquiring a second voltage value of the second type of battery cell;
determining an adjusted discharge power of the battery pack based on the voltage value, comprising:
determining a first adjusted discharge power of the battery pack based on the first voltage value;
determining a second adjusted discharge power of the battery pack based on the second voltage value;
updating an allowable discharge power of the battery pack to a discharge power having a minimum value among the first and second adjusted discharge powers.
4. The method of claim 3, wherein determining the adjusted discharge power of the battery pack based on the voltage value comprises:
and when the voltage value is not less than a preset adjusting threshold value, taking the allowable discharging power of the battery pack as the adjusting discharging power.
5. The method of claim 4, further comprising:
when the voltage value is smaller than the preset adjusting threshold value, determining the reduction ratio of the allowable discharging power of the battery pack; wherein, the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared with the preset adjustment threshold value;
Determining the adjusted discharge power based on the reduction ratio and an allowable discharge power of the battery pack.
6. The method of claim 4, further comprising:
when the voltage value is smaller than the preset adjustment threshold value and is larger than the cut-off voltage of the electric core corresponding to the voltage value, determining the reduction ratio of the allowable discharge power of the battery pack; wherein, the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared with the preset adjustment threshold value; or
When the voltage value is smaller than the preset adjustment threshold value and the voltage value is smaller than the cut-off voltage of the battery cell corresponding to the voltage value, determining the reduction ratio of the allowable discharge power of the battery pack; the reduction proportion of the allowable discharge power of the battery pack is the same as the reduction proportion of the cut-off voltage of the battery cell corresponding to the voltage value compared with the preset adjustment threshold value;
determining the adjusted discharge power based on the reduction ratio and an allowable discharge power of the battery pack.
7. An allowable charging power estimation method, comprising:
acquiring a first charge state and a first temperature value of a first type of battery cell in a battery pack;
Acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack;
determining a first allowable charging current of the first type of battery cell based on the first state of charge and the first temperature value;
determining a second allowable charging current of the second kind of cell based on the second state of charge and the second temperature value;
and calculating the allowable charging power of the battery pack based on the charging current with the minimum value in the first allowable charging current and the second allowable charging current, the open-circuit voltage of the first type battery cell, the number of battery cells of the first type battery cell, the open-circuit voltage of the second type battery cell and the number of battery cells of the second type battery cell.
8. The allowable charging power estimation method according to claim 7, wherein the determining a first allowable charging current for the first cell type based on the first state of charge and the first temperature value comprises:
determining a first initial allowable charging current of the first type of battery cell based on the first state of charge and the first temperature value;
calculating the first allowable charging current based on the first initial allowable charging current and the aging coefficient of the first type of battery cell;
Determining a second allowable charging current of the second type of cell based on the second state of charge and the second temperature value, including:
determining a second initial allowable charging current of the second type of battery cell based on the second state of charge and the second temperature value;
and calculating the second allowable charging current based on the second initial allowable charging current and the aging coefficient of the second type of battery cell.
9. The method of claim 7, wherein determining the open circuit voltage of the first cell type comprises:
determining an initial open circuit voltage of the first type of cell based on the first state of charge;
determining an open-circuit voltage of the first type of cell based on an initial open-circuit voltage of the first type of cell and an aging coefficient of the first type of cell;
determining an open circuit voltage of the second type of cell by:
determining an initial open circuit voltage of the second type of cell based on the second state of charge;
determining an open-circuit voltage of the second-type cell based on the initial open-circuit voltage of the second-type cell and the aging coefficient of the second-type cell.
10. The utility model provides a battery cell control device which characterized in that includes:
the first acquisition module is used for acquiring a first charge state and a first temperature value of a first type battery cell in a battery pack, and acquiring a second charge state and a second temperature value of a second type battery cell in the battery pack;
a first determining module, configured to determine a first allowable discharge current of the first type of cell based on the first state of charge and the first temperature value; determining a second allowable discharge current of the second type of battery cell based on the second state of charge and the second temperature value;
and the calculation module is used for calculating the allowable discharge power of the battery pack based on the discharge current with the minimum value in the first allowable discharge current and the second allowable discharge current, the cut-off voltage of the first type of battery cell, the number of battery cells of the first type of battery cell, the cut-off voltage of the second type of battery cell and the number of battery cells of the second type of battery cell.
11. The apparatus of claim 10, wherein the first determining module is specifically configured to determine a first initial allowable discharge current of the first type of cell based on the first state of charge and the first temperature value; calculating the first allowable discharge current based on the first initial allowable discharge current and the aging coefficient of the first type of battery cell; determining a second initial allowable discharge current of the second type of battery cell based on the second state of charge and the second temperature value; and calculating the second allowable discharge current based on the second initial allowable discharge current and the aging coefficient of the second type of battery cell.
12. The apparatus of claim 10, further comprising:
the second obtaining module is used for obtaining a first voltage value of the first type of battery cell; acquiring a second voltage value of the second type of battery cell;
a second determining module, configured to determine an adjusted discharge power of the battery pack based on a voltage value, wherein the second determining module is specifically configured to determine a first adjusted discharge power of the battery pack based on the first voltage value; and determining a second adjusted discharge power of the battery pack based on the second voltage value;
and the updating module is used for updating the allowable discharging power of the battery pack to the discharging power with the minimum value in the first adjusting discharging power and the second adjusting discharging power.
13. The apparatus of claim 12, wherein the second determining module is specifically configured to use an allowable discharging power of the battery pack as the adjusted discharging power when the voltage value is not less than a preset adjustment threshold.
14. The apparatus according to claim 13, wherein the second determining module is specifically configured to determine a reduction ratio of the allowable discharging power of the battery pack when the voltage value is smaller than the preset adjustment threshold; wherein, the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared with the preset adjustment threshold value; determining the adjusted discharge power based on the reduction ratio and an allowable discharge power of the battery pack.
15. The apparatus according to claim 13, wherein the second determining module is specifically configured to determine a reduction ratio of the allowable discharge power of the battery pack when the voltage value is smaller than the preset adjustment threshold and is greater than a cut-off voltage of a cell corresponding to the voltage value; wherein, the reduction ratio of the allowable discharge power of the battery pack is the same as the reduction ratio of the voltage value compared with the preset adjustment threshold value; or when the voltage value is smaller than the preset adjustment threshold value and the voltage value is smaller than the cut-off voltage of the electric core corresponding to the voltage value, determining the reduction ratio of the allowable discharge power of the battery pack; the reduction proportion of the allowable discharge power of the battery pack is the same as the reduction proportion of the cut-off voltage of the battery cell corresponding to the voltage value compared with the preset adjustment threshold value; determining the adjusted discharge power based on the reduction ratio and an allowable discharge power of the battery pack.
16. A cell control device, comprising:
the battery pack comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring a first charge state and a first temperature value of a first type battery cell in the battery pack; acquiring a second charge state and a second temperature value of a second type of battery cell in the battery pack;
A first determination module, configured to determine a first allowable charging current of the first type of cell based on the first state of charge and the first temperature value; determining a second allowable charging current of the second type of battery cell based on the second state of charge and the second temperature value;
and the calculation module is used for calculating the allowable charging power of the battery pack based on the charging current with the minimum value in the first allowable charging current and the second allowable charging current, the open-circuit voltage of the first type of battery cell, the number of battery cells of the first type of battery cell, the open-circuit voltage of the second type of battery cell and the number of battery cells of the second type of battery cell.
17. The apparatus of claim 16, wherein the first determining module is specifically configured to determine a first initial allowable charging current for the first type of cell based on the first state of charge and the first temperature value; calculating the first allowable charging current based on the first initial allowable charging current and the aging coefficient of the first type of battery cell; determining a second initial allowable charging current of the second type of battery cell based on the second state of charge and the second temperature value; and calculating the second allowable charging current based on the second initial allowable charging current and the aging coefficient of the second type of battery cell.
18. The apparatus of claim 16, further comprising: a second determination module;
the second determining module is used for determining the initial open-circuit voltage of the first type of battery cell based on the first state of charge; determining an open-circuit voltage of the first type of cell based on an initial open-circuit voltage of the first type of cell and an aging coefficient of the first type of cell; and determining an initial open circuit voltage of the second type of cell based on the second state of charge; determining an open-circuit voltage of the second-type cell based on the initial open-circuit voltage of the second-type cell and the aging coefficient of the second-type cell.
19. A battery management system, comprising: a processor and a memory, the processor and the memory connected;
the memory is used for storing programs;
the processor is configured to execute a program stored in the memory to perform the method of any of claims 1-6.
20. A battery management system, comprising: a processor and a memory, the processor and the memory connected;
the memory is used for storing programs;
The processor is configured to execute a program stored in the memory to perform the method of any of claims 7-9.
21. A storage medium, having stored thereon a computer program which, when executed by a computer, performs the method of any one of claims 1-6.
22. A storage medium, having stored thereon a computer program which, when executed by a computer, performs the method of any one of claims 7-9.
CN202011572286.2A 2020-12-25 2020-12-25 Allowable power estimation method, battery management system and storage medium Pending CN114675193A (en)

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