CN113067384A - Low-temperature charging and discharging management method and device for lithium iron battery, electronic equipment and medium - Google Patents

Low-temperature charging and discharging management method and device for lithium iron battery, electronic equipment and medium Download PDF

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CN113067384A
CN113067384A CN202110347913.0A CN202110347913A CN113067384A CN 113067384 A CN113067384 A CN 113067384A CN 202110347913 A CN202110347913 A CN 202110347913A CN 113067384 A CN113067384 A CN 113067384A
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temperature
threshold
lithium iron
current
iron battery
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Inventor
吴伟
张志平
刘聪
蒙柱杏
郑君彬
曾国强
黄李冲
叶国华
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Guangdong Greenway Technology Co Ltd
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Guangdong Greenway Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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

Abstract

The application discloses a low-temperature charging and discharging management method and device for a lithium iron battery, electronic equipment and a storage medium. The method comprises the following steps: acquiring initial current and initial temperature of the lithium iron battery; setting a first threshold voltage of a low voltage protection value of the BMS if the initial temperature is less than a first threshold temperature and the initial current is greater than a first threshold current; the lithium iron battery is allowed to be charged and discharged within the first threshold voltage range, and a second current and a second temperature are obtained; setting a second threshold voltage of a low voltage protection value of the BMS if the second temperature is lower than a second threshold temperature and the second current is greater than a second threshold current; and the lithium iron battery completes charging and discharging within the second threshold voltage range. According to the lithium iron battery, the voltage protection value at a low temperature is reduced, the battery is allowed to charge and discharge, the battery is discharged to form an internal heating process, the voltage protection value is increased after the temperature rises, the lithium iron battery does not need to be heated externally when being used in a low-temperature environment, and more efficient charging and discharging are achieved.

Description

Low-temperature charging and discharging management method and device for lithium iron battery, electronic equipment and medium
Technical Field
The present disclosure relates generally to the field of battery management technologies, and in particular, to a low-temperature charging and discharging management method and apparatus for an iron-lithium battery, an electronic device, and a medium.
Background
In the prior art, a lithium iron battery has a problem of poor low-temperature performance, so that a user cannot use an electric vehicle at a low temperature, and most of manufacturers improve the charge and discharge capacity of the lithium battery at the low temperature by requiring and specifying the use environment of the lithium battery or performing a heat preservation and heating control mode on the battery. Although the prior art can solve the problem of charging and discharging in a low-temperature environment, a large amount of preparation work needs to be performed by a user, for example, the battery is heated by using external equipment, so that certain danger exists, and the user experience is poor.
Therefore, a more reliable low-temperature charging and discharging management method for the lithium iron battery is desired, and the problems in the prior art are solved.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a method and an apparatus for managing low-temperature charging and discharging of an iron-lithium battery, an electronic device and a storage medium, which can meet the specific requirements of low-temperature charging and discharging management of the iron-lithium battery at present.
Based on one aspect of the embodiment of the present invention, an embodiment of the present application provides a low-temperature charging and discharging management method for an iron-lithium battery, where the method includes:
acquiring initial current and initial temperature of the lithium iron battery;
setting a first threshold voltage of a low voltage protection value of the BMS if the initial temperature is less than a first threshold temperature and the initial current is greater than a first threshold current according to the initial current and the initial temperature;
according to a first threshold voltage of a low-voltage protection value of the BMS, the lithium iron battery is allowed to be charged and discharged within the range of the first threshold voltage, a second current and a second temperature of the lithium iron battery are obtained, and the second temperature is higher than the initial temperature;
setting a second threshold voltage of a low voltage protection value of the BMS if the second temperature is lower than a second threshold temperature and the second current is greater than a second threshold current;
and according to a second threshold voltage of the low-voltage protection value of the BMS, the lithium iron battery completes charging and discharging within the range of the second threshold voltage.
In one embodiment, the setting of the first threshold voltage of the low voltage protection value of the BMS if the initial temperature is less than the first threshold temperature and the initial current is greater than the first threshold current according to the initial current and the initial temperature includes:
acquiring a first threshold current, a first threshold temperature and a first threshold voltage;
comparing the first threshold current to an initial current, a first threshold temperature to an initial temperature;
if the initial temperature is not less than the first threshold temperature, the lithium iron battery is allowed to be charged and discharged;
if the initial temperature is lower than the first threshold temperature and the initial current is lower than the first threshold current, the lithium iron battery is not allowed to be charged and discharged;
and if the initial temperature is lower than the first threshold temperature and the initial current is not lower than the first threshold current, the lithium iron battery is allowed to be charged and discharged, and meanwhile, the low-voltage protection value of the BMS is set as the first threshold voltage.
In one embodiment, the charging and discharging of the lithium iron battery in the first threshold voltage range according to the first threshold voltage of the low voltage protection value of the BMS is allowed to obtain a second current and a second temperature of the lithium iron battery, where the second temperature is higher than the initial temperature, including:
when the lithium iron battery is allowed to be charged and discharged within the first threshold voltage range, the thermal power generated by the lithium iron battery is I2R and I are initial charging and discharging currents of the lithium iron battery, and R is internal resistance of the lithium iron battery;
according to the thermal power generated by the lithium iron battery during charging and discharging, the temperature of the lithium iron battery is increased due to heat generation;
and acquiring that the second temperature is greater than the initial temperature.
In one embodiment, the setting of the second threshold voltage of the low voltage protection value of the BMS if the second temperature is lower than a second threshold temperature and the second current is greater than a second threshold current includes:
when the lithium iron battery is allowed to be charged and discharged within the first threshold voltage range, acquiring a second current and a second temperature of the lithium iron battery, and a second threshold current, a second threshold temperature and a second threshold voltage;
comparing the second threshold current to a second current, a second threshold temperature to a second temperature;
if the second temperature is not less than the second threshold temperature, the lithium iron battery is allowed to be charged and discharged;
if the second temperature is lower than the first threshold temperature and the initial current is lower than the second threshold current, the lithium iron battery is charged and discharged within the first threshold voltage range;
and if the second temperature is lower than the second threshold temperature and the second current is not lower than the second threshold current, the lithium iron battery is allowed to be charged and discharged within the second threshold voltage range, and meanwhile, the low-voltage protection value of the BMS is set as the second threshold voltage.
In one embodiment, the internal resistance of the lithium iron battery decreases with increasing temperature.
In one embodiment, the first and second threshold voltages are preset in the BMS to set a low voltage protection value of the BMS.
Based on another aspect of the embodiments of the present invention, a low-temperature charging and discharging management device for an iron-lithium battery is disclosed, the device comprising:
the acquisition module is used for acquiring the initial current and the initial temperature of the lithium iron battery and acquiring the second current and the second temperature of the lithium iron battery when the lithium iron battery is charged and discharged;
the comparison module is used for comparing the initial current with a first threshold current, the initial temperature with a first threshold temperature, the second current with a second threshold current, and the second temperature with a second threshold temperature;
and the setting module is used for setting a low-voltage protection value of the BMS according to the comparison result of the comparison module, wherein the low-voltage protection value comprises a first threshold voltage and a second threshold voltage, and the first threshold voltage is smaller than the second threshold voltage, and the charging and discharging of the lithium iron battery are started.
In accordance with yet another aspect of an embodiment of the present invention, an electronic device is disclosed, the electronic device comprising one or more processors and memory, the memory for storing one or more programs; when the one or more programs are executed by the processor, the processor is enabled to implement the low-temperature charging and discharging management method for the lithium iron battery provided by the embodiments of the invention.
Based on still another aspect of the embodiments of the present invention, a computer-readable storage medium storing a computer program is disclosed, where the computer program is executed to implement the method for managing low-temperature charging and discharging of an lithium iron battery provided in the embodiments of the present invention.
In the embodiment of the application, initial temperature and initial current through obtaining lithium iron battery, set for the low pressure protection value of BMS, allow lithium iron battery to carry out the charge and discharge of certain electric current under the low temperature condition, lithium iron battery is at the in-process self production of charge and discharge, make the temperature of lithium iron battery slowly rise, to suitable operating temperature environment, lithium iron battery alright normally carries out charge and discharge, this application is through reducing the voltage protection value at low temperature, allow battery charge and discharge, make the battery discharge form the process of internal heating, improve the voltage protection value after the temperature rises again, make lithium iron battery need not carry out external heating when using under low temperature environment, form the process of internal heating through battery discharge, obviously improve lithium iron battery charge and discharge ability at low temperature, improve user's consumption experience.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is an exemplary flowchart of a low-temperature charging and discharging management method for an lithium iron battery according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a low-temperature charging and discharging management device for an lithium iron battery according to an embodiment of the present application;
FIG. 3 is a diagram illustrating an internal structure of an electronic device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Please refer to fig. 1, which shows an exemplary flow of a low-temperature charging and discharging management method for an iron-lithium battery to which an embodiment of the present application may be applied.
As shown in fig. 1, the low-temperature charging and discharging management method for the lithium iron battery includes:
in step 110, an initial current and an initial temperature of the lithium iron battery are obtained.
Specifically, the initial current and the initial temperature of the lithium iron battery obtained at this time are the temperature and the current of the battery when the battery is attempted to start, if the temperature and the current are greater than a certain value, the corresponding execution step is performed, and if the temperature and the current are less than a certain value, the specific command for performing charge and discharge may be stopped, and other corresponding execution steps may also be performed.
In step 120, a first threshold voltage of a low voltage protection value of the BMS is set if the initial temperature is less than a first threshold temperature and the initial current is greater than a first threshold current, depending on the initial current and the initial temperature.
Specifically, the first threshold temperature and the first threshold current may be obtained by querying a "parameter table of low-voltage protection values of lithium iron battery corresponding to different temperature conditions", where the table is set by a manufacturer of the lithium iron battery when the battery leaves a factory, and may be obtained by public querying. When the initial temperature is lower than the first threshold temperature, the detection temperature of the lithium iron battery is judged to be lower, and the lithium iron battery cannot be charged directly according to normal charging and discharging parameters, at the moment, the judgment that the initial current is larger than the first threshold current is used for enabling the thermal power of the lithium iron battery to reach a certain standard, if the thermal power of the lithium iron battery is very low, the purpose of automatically increasing the temperature of the lithium iron battery cannot be achieved, and only if the initial current exceeds the first threshold current, the temperature of the lithium iron battery can reach parameter indexes for normally charging and discharging within a relatively proper time length.
Specifically, in one embodiment of the present application, the setting of the first threshold voltage of the low voltage protection value of the BMS if the initial temperature is less than the first threshold temperature and the initial current is greater than the first threshold current according to the initial current and the initial temperature includes:
acquiring a first threshold current, a first threshold temperature and a first threshold voltage; the first threshold current, the first threshold temperature and the first threshold voltage can be obtained by querying a lithium iron battery low-voltage protection value parameter table corresponding to different temperature conditions, and the first threshold current, the first threshold temperature and the first threshold voltage meet the lowest parameter index of the lithium iron battery for charging and discharging under the low-temperature condition, for example, if the initial current is less than the first threshold current, the lithium iron battery cannot be charged and discharged, for example, if the initial temperature is greater than the first threshold temperature, the initial temperature of the lithium iron battery does not meet the low-temperature condition, and the lithium iron battery can directly work under the normal-temperature condition.
Comparing the first threshold current to an initial current, a first threshold temperature to an initial temperature;
if the initial temperature is not less than the first threshold temperature, the lithium iron battery is allowed to be charged and discharged;
if the initial temperature is lower than the first threshold temperature and the initial current is lower than the first threshold current, the lithium iron battery is not allowed to be charged and discharged;
and if the initial temperature is lower than the first threshold temperature and the initial current is not lower than the first threshold current, the lithium iron battery is allowed to be charged and discharged, and meanwhile, the low-voltage protection value of the BMS is set as the first threshold voltage.
In step 130, according to a first threshold voltage of the low voltage protection value of the BMS, the lithium iron battery is allowed to be charged and discharged within the first threshold voltage range, and a second current and a second temperature of the lithium iron battery are obtained, wherein the second temperature is higher than the initial temperature.
Specifically, after initial temperature and initial current have satisfied the condition that lithium iron battery cold-starting, the BMS system of lithium iron battery then sets for a low pressure protective value, be exactly first threshold voltage, also be that lithium iron battery can only carry out charge-discharge work in the protective range of first threshold voltage, its purpose is in order to promote the temperature of lithium iron battery to realize the normal charge-discharge work of lithium iron battery. When the lithium iron battery is charged and discharged within the protection range of the first threshold voltage, the working current and the temperature of the lithium iron battery, namely the second current and the second temperature, need to be acquired in real time.
Specifically, in an embodiment of the present application, the charging and discharging of the lithium iron battery within the first threshold voltage range is allowed according to a first threshold voltage of the low voltage protection value of the BMS, a second current and a second temperature of the lithium iron battery are obtained, and the second temperature is higher than the initial temperature, including:
when the lithium iron battery is allowed to be charged and discharged within the first threshold voltage range, the thermal power generated by the lithium iron battery is I2R and I are initial current of charging and discharging of the lithium iron battery, and R isInternal resistance of the lithium iron battery; the internal resistance of the lithium iron battery is reduced along with the rise of the temperature;
according to the thermal power generated by the lithium iron battery during charging and discharging, the temperature of the lithium iron battery is increased due to heat generation;
and acquiring that the second temperature is greater than the initial temperature.
Specifically, when the lithium iron battery is charged and discharged, the battery can generate heat, the temperature rises slowly, the chemical reaction activity of the electrolyte is enhanced along with the rise of the temperature, the internal resistance of the battery is gradually reduced, and the lithium iron battery can be charged and discharged normally in a suitable working temperature environment.
In step 140, if the second temperature is lower than a second threshold temperature and the second current is greater than a second threshold current, a second threshold voltage of the low voltage protection value of the BMS is set.
Specifically, the second threshold voltage at this time is that after the temperature of the lithium iron battery reaches a certain degree, the first threshold voltage is no longer suitable for being set as the low-voltage protection value of the BMS along with the rise of the temperature of the battery, and the corresponding low-voltage protection values are different due to different temperature conditions of a lithium iron battery low-voltage protection value parameter table corresponding to different temperature conditions, so that the low-voltage protection value of the battery can be continuously adjusted according to the battery temperature collected in real time.
Specifically, in one embodiment of the present application, the setting of the second threshold voltage of the low voltage protection value of the BMS if the second temperature is lower than the second threshold temperature and the second current is greater than the second threshold current includes:
when the lithium iron battery is allowed to be charged and discharged within the first threshold voltage range, acquiring a second current and a second temperature of the lithium iron battery, and a second threshold current, a second threshold temperature and a second threshold voltage;
comparing the second threshold current to a second current, a second threshold temperature to a second temperature;
if the second temperature is not less than the second threshold temperature, the lithium iron battery is allowed to be charged and discharged;
if the second temperature is lower than the first threshold temperature and the initial current is lower than the second threshold current, the lithium iron battery is charged and discharged within the first threshold voltage range;
and if the second temperature is lower than the second threshold temperature and the second current is not lower than the second threshold current, the lithium iron battery is allowed to be charged and discharged within the second threshold voltage range, and meanwhile, the low-voltage protection value of the BMS is set as the second threshold voltage.
In the embodiment of the present application, the first and second threshold voltages are preset in the BMS to set the low voltage protection value of the BMS.
The corresponding lithium iron battery low-voltage protection value parameter table under different temperature conditions is as follows:
corresponding lithium iron battery low-voltage protection value parameter table under different temperature conditions
Figure BDA0003001403630000071
Figure BDA0003001403630000081
In step 150, according to a second threshold voltage of the low voltage protection value of the BMS, the lithium iron battery completes charging and discharging within the second threshold voltage range.
In the embodiment of the application, initial temperature and initial current through acquireing lithium iron battery, set for the low pressure protection value of BMS, allow lithium iron battery to carry out the charge-discharge of certain electric current under the low temperature condition, lithium iron battery is at the in-process self production of heat of charge-discharge, make the temperature of lithium iron battery slowly rise, to suitable operating temperature environment, lithium iron battery alright in order normally to carry out charge-discharge, this application can save the step that the user need carry out external heating to the lithium cell when using the electric motor car under the low temperature environment, form the process of internal heating through battery discharge, obviously improve lithium iron battery charge-discharge ability at low temperature, improve user's consumption experience.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
Fig. 2 is a schematic structural diagram of a low-temperature charging and discharging management device for an lithium iron battery according to an embodiment of the present application, and as shown in fig. 2, the low-temperature charging and discharging management device for the lithium iron battery includes: the device comprises an acquisition module, a comparison module and a setting module;
the acquisition module is used for acquiring the initial current and the initial temperature of the lithium iron battery and acquiring the second current and the second temperature of the lithium iron battery when the lithium iron battery is charged and discharged;
the comparison module is used for comparing the initial current with a first threshold current, the initial temperature with a first threshold temperature, the second current with a second threshold current, and the second temperature with a second threshold temperature;
and the setting module is used for setting a low-voltage protection value of the BMS according to the comparison result of the comparison module, wherein the low-voltage protection value comprises a first threshold voltage and a second threshold voltage, and the first threshold voltage is smaller than the second threshold voltage, and the charging and discharging of the lithium iron battery are started.
In a specific embodiment, the comparison module of the present application is configured to obtain a first threshold current, a first threshold temperature, and a first threshold voltage; comparing the first threshold current to an initial current, a first threshold temperature to an initial temperature; if the initial temperature is not less than the first threshold temperature, the lithium iron battery is allowed to be charged and discharged; if the initial temperature is lower than the first threshold temperature and the initial current is lower than the first threshold current, the lithium iron battery is not allowed to be charged and discharged; the setting module controls the lithium iron battery to allow charging and discharging when the initial temperature is lower than the first threshold temperature and the initial current is not lower than the first threshold current, and simultaneously sets the low-voltage protection value of the BMS as the first threshold voltage.
In a specific embodiment, the comparison module of the present application is used for the lithium iron battery to allow charging and discharging within the first threshold voltage range, and the thermal power generated by the lithium iron battery is I2R and I are initial charging and discharging currents of the lithium iron battery, and R is internal resistance of the lithium iron battery; according to the thermal power generated by the lithium iron battery during charging and discharging, the temperature of the lithium iron battery is increased due to heat generation; and acquiring that the second temperature is greater than the initial temperature.
In a specific embodiment, the setting module of the present application is configured to obtain a second current and a second temperature of the lithium iron battery, and a second threshold current, a second threshold temperature, and a second threshold voltage when the lithium iron battery allows charging and discharging within the first threshold voltage range; comparing the second threshold current to a second current, a second threshold temperature to a second temperature; if the second temperature is not less than the second threshold temperature, the lithium iron battery is allowed to be charged and discharged; if the second temperature is lower than the first threshold temperature and the initial current is lower than the second threshold current, the lithium iron battery is charged and discharged within the first threshold voltage range; and if the second temperature is lower than the second threshold temperature and the second current is not lower than the second threshold current, the lithium iron battery is allowed to be charged and discharged within the second threshold voltage range, and meanwhile, the low-voltage protection value of the BMS is set as the second threshold voltage.
In this application embodiment, acquire the initial temperature and the initial current of lithium iron battery through acquireing the module, set for the low pressure protection value of BMS through setting up the module, allow lithium iron battery to carry out the charge-discharge of certain electric current under the low temperature condition, lithium iron battery is at the in-process self production of charge-discharge, make the temperature of lithium iron battery slowly rise, to the operating temperature environment that is fit for, lithium iron battery alright in order normally to carry out charge-discharge, this application can save the step that the user need carry out external heating to the lithium cell when using the electric motor car under low temperature environment, form the process of internal heating through battery discharge, obviously improve lithium iron battery charge-discharge ability at low temperature, improve user's consumption experience.
For specific limitations of the low-temperature charging and discharging management device for the lithium iron battery, reference may be made to the above limitations on the low-temperature charging and discharging management method for the lithium iron battery, and details are not described herein again. All or part of each module in the low-temperature charging and discharging management device for the lithium iron battery can be realized by software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, an electronic device is provided, and the internal structure of the electronic device may be as shown in fig. 3. The electronic device comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the electronic device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, Near Field Communication (NFC) or other technologies. The computer program is executed by a processor to realize a low-temperature charging and discharging management method for the lithium iron battery. The display screen of the electronic equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the electronic equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 3 is a block diagram of only a portion of the architecture associated with the subject application, and does not constitute a limitation on the electronic devices to which the subject application may be applied, and that a particular electronic device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, the device for managing low-temperature charging and discharging of an lithium iron battery provided by the present application may be implemented in the form of a computer program, and the computer program may be executed on an electronic device as shown in fig. 3. The memory of the electronic device may store various program modules constituting the low-temperature charging and discharging management device for the lithium iron battery, such as an obtaining module, a comparing module, and a setting module shown in fig. 2. The computer program constituted by the program modules causes the processor to execute the steps of the lithium iron battery low-temperature charge and discharge management method according to the embodiments of the present application described in the present specification.
In a specific embodiment, the processor of the present application, when executing one or more programs, is configured to obtain an initial current and an initial temperature of the lithium iron battery; setting a first threshold voltage of a low voltage protection value of the BMS if the initial temperature is less than a first threshold temperature and the initial current is greater than a first threshold current according to the initial current and the initial temperature; according to a first threshold voltage of a low-voltage protection value of the BMS, the lithium iron battery is allowed to be charged and discharged within the range of the first threshold voltage, a second current and a second temperature of the lithium iron battery are obtained, and the second temperature is higher than the initial temperature; setting a second threshold voltage of a low voltage protection value of the BMS if the second temperature is lower than a second threshold temperature and the second current is greater than a second threshold current; and according to a second threshold voltage of the low-voltage protection value of the BMS, the lithium iron battery completes charging and discharging within the range of the second threshold voltage.
In a particular embodiment, a processor of the present application, when executing one or more programs, is configured to obtain a first threshold current, a first threshold temperature, and a first threshold voltage; comparing the first threshold current to an initial current, a first threshold temperature to an initial temperature; if the initial temperature is not less than the first threshold temperature, the lithium iron battery is allowed to be charged and discharged; if the initial temperature is lower than the first threshold temperature and the initial current is lower than the first threshold current, the lithium iron battery is not allowed to be charged and discharged; and if the initial temperature is lower than the first threshold temperature and the initial current is not lower than the first threshold current, the lithium iron battery is allowed to be charged and discharged, and meanwhile, the low-voltage protection value of the BMS is set as the first threshold voltage.
In a specific embodiment, when the processor of the present application executes one or more programs, the processor is configured to enable the lithium iron battery to allow charging and discharging within the first threshold voltage range, and the thermal power generated by the lithium iron battery is I2R and I are initial charging and discharging currents of the lithium iron battery, and R is internal resistance of the lithium iron battery; according to the thermal power generated by the lithium iron battery during charging and discharging, the temperature of the lithium iron battery is increased due to heat generation; and acquiring that the second temperature is greater than the initial temperature.
In a specific embodiment, when executing one or more programs, the processor of the present application is configured to obtain a second current and a second temperature, and a second threshold current, a second threshold temperature, and a second threshold voltage of the lithium iron battery when the lithium iron battery allows charging and discharging within the first threshold voltage range; comparing the second threshold current to a second current, a second threshold temperature to a second temperature; if the second temperature is not less than the second threshold temperature, the lithium iron battery is allowed to be charged and discharged; if the second temperature is lower than the first threshold temperature and the initial current is lower than the second threshold current, the lithium iron battery is charged and discharged within the first threshold voltage range; and if the second temperature is lower than the second threshold temperature and the second current is not lower than the second threshold current, the lithium iron battery is allowed to be charged and discharged within the second threshold voltage range, and meanwhile, the low-voltage protection value of the BMS is set as the second threshold voltage.
In particular, according to an embodiment of the present disclosure, the low-temperature charging and discharging management method for the lithium iron battery described in any of the above embodiments may be implemented as a computer software program. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing a method for low temperature charge and discharge management of lithium iron batteries. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium.
The one or more programs are stored in a program in a read only memory ROM or a program in a random access memory RAM to perform various appropriate actions and processes. In the RAM, a software program for the server to perform a corresponding service is included, and various programs and data required for the driving operation of the vehicle are also included. The server and its controlled hardware devices, a read only memory ROM, a random access memory RAM are connected to each other through a bus, to which various input/output interfaces are also connected.
The following components are connected to the input/output interface: an input section including a keyboard, a mouse, and the like; an output section including a cathode ray tube CRT, a liquid crystal display LCD, and the like, a speaker, and the like; and a communication section including a network interface card such as a LAN card, a modem, or the like. The communication section performs communication processing via a network such as the internet. The driver is also connected to the input/output interface as needed. A removable medium such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive as necessary, so that a computer program read out therefrom is mounted in the memory as necessary.
In particular, according to an embodiment of the present disclosure, the low-temperature charging and discharging management method for the lithium iron battery described in any of the above embodiments may be implemented as a computer software program. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing a method for low temperature charge and discharge management of lithium iron batteries. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium.
The units or modules described in the embodiments of the present application may be implemented by software or hardware. The described units or modules may also be provided in a processor. The names of these units or modules do not in some cases constitute a limitation of the unit or module itself.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (9)

1. A low-temperature charging and discharging management method for a lithium iron battery is characterized by comprising the following steps:
acquiring initial current and initial temperature of the lithium iron battery;
setting a first threshold voltage of a low voltage protection value of the BMS if the initial temperature is less than a first threshold temperature and the initial current is greater than a first threshold current according to the initial current and the initial temperature;
according to a first threshold voltage of a low-voltage protection value of the BMS, the lithium iron battery is allowed to be charged and discharged within the range of the first threshold voltage, a second current and a second temperature of the lithium iron battery are obtained, and the second temperature is higher than the initial temperature;
setting a second threshold voltage of a low voltage protection value of the BMS if the second temperature is lower than a second threshold temperature and the second current is greater than a second threshold current;
and according to a second threshold voltage of the low-voltage protection value of the BMS, the lithium iron battery completes charging and discharging within the range of the second threshold voltage.
2. The method of claim 1, wherein setting a first threshold voltage of a low voltage protection value of the BMS if the initial temperature is less than a first threshold temperature and the initial current is greater than a first threshold current based on the initial current and the initial temperature comprises:
acquiring a first threshold current, a first threshold temperature and a first threshold voltage;
comparing the first threshold current to an initial current, a first threshold temperature to an initial temperature;
if the initial temperature is not less than the first threshold temperature, the lithium iron battery is allowed to be charged and discharged;
if the initial temperature is lower than the first threshold temperature and the initial current is lower than the first threshold current, the lithium iron battery is not allowed to be charged and discharged;
and if the initial temperature is lower than the first threshold temperature and the initial current is not lower than the first threshold current, the lithium iron battery is allowed to be charged and discharged, and meanwhile, the low-voltage protection value of the BMS is set as the first threshold voltage.
3. The method of claim 2, wherein the allowing charging and discharging of the lithium iron battery within the first threshold voltage range according to a first threshold voltage of a low voltage protection value of the BMS to obtain a second current and a second temperature of the lithium iron battery, the second temperature being higher than the initial temperature comprises:
when the lithium iron battery is allowed to be charged and discharged within the first threshold voltage range, the thermal power generated by the lithium iron battery is I2R and I are initial charging and discharging currents of the lithium iron battery, and R is internal resistance of the lithium iron battery;
according to the thermal power generated by the lithium iron battery during charging and discharging, the temperature of the lithium iron battery is increased due to heat generation;
and acquiring that the second temperature is greater than the initial temperature.
4. The method of claim 3, wherein setting a second threshold voltage of a low voltage protection value of the BMS if the second temperature is below a second threshold temperature and the second current is greater than a second threshold current comprises:
when the lithium iron battery is allowed to be charged and discharged within the first threshold voltage range, acquiring a second current and a second temperature of the lithium iron battery, and a second threshold current, a second threshold temperature and a second threshold voltage;
comparing the second threshold current to a second current, a second threshold temperature to a second temperature;
if the second temperature is not less than the second threshold temperature, the lithium iron battery is allowed to be charged and discharged;
if the second temperature is lower than the first threshold temperature and the initial current is lower than the second threshold current, the lithium iron battery is charged and discharged within the first threshold voltage range;
and if the second temperature is lower than the second threshold temperature and the second current is not lower than the second threshold current, the lithium iron battery is allowed to be charged and discharged within the second threshold voltage range, and meanwhile, the low-voltage protection value of the BMS is set as the second threshold voltage.
5. The method of claim 3, wherein the internal resistance of the lithium iron battery decreases with increasing temperature.
6. The method of claim 1, wherein the first and second threshold voltages are preset in the BMS to set a low voltage protection value of the BMS.
7. The utility model provides a lithium iron battery low temperature charge-discharge management device which characterized in that, the device includes:
the acquisition module is used for acquiring battery parameter information, wherein the battery parameter information comprises battery pack voltage information, single cell voltage information, charge-discharge current information and cell surface temperature information;
and the control module is used for controlling the on or off of the charging and discharging MOS tube according to the battery parameter information.
The acquisition module is used for acquiring the initial current and the initial temperature of the lithium iron battery and acquiring the second current and the second temperature of the lithium iron battery when the lithium iron battery is charged and discharged;
the comparison module is used for comparing the initial current with a first threshold current, the initial temperature with a first threshold temperature, the second current with a second threshold current, and the second temperature with a second threshold temperature;
and the setting module is used for setting a low-voltage protection value of the BMS according to the comparison result of the comparison module, wherein the low-voltage protection value comprises a first threshold voltage and a second threshold voltage, and the first threshold voltage is smaller than the second threshold voltage, and the charging and discharging of the lithium iron battery are started.
8. An electronic device, comprising one or more processors and memory, the memory to store one or more programs;
the one or more programs, when executed by the processor, cause the processor to implement the method of any of claims 1-6.
9. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed, implements the method of any one of claims 1 to 6.
CN202110347913.0A 2021-03-31 2021-03-31 Low-temperature charging and discharging management method and device for lithium iron battery, electronic equipment and medium Pending CN113067384A (en)

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