CN116759628A - Lithium battery for solar street lamp, heating control method of lithium battery and solar street lamp - Google Patents
Lithium battery for solar street lamp, heating control method of lithium battery and solar street lamp Download PDFInfo
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- CN116759628A CN116759628A CN202310707999.2A CN202310707999A CN116759628A CN 116759628 A CN116759628 A CN 116759628A CN 202310707999 A CN202310707999 A CN 202310707999A CN 116759628 A CN116759628 A CN 116759628A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 167
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 167
- 238000010438 heat treatment Methods 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000007600 charging Methods 0.000 claims abstract description 75
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 39
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 238000010278 pulse charging Methods 0.000 claims abstract description 19
- 239000004033 plastic Substances 0.000 claims abstract description 18
- 239000004677 Nylon Substances 0.000 claims abstract description 6
- 229920001778 nylon Polymers 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims description 24
- 238000005286 illumination Methods 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 14
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 11
- 239000000523 sample Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 210000004027 cell Anatomy 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229920006834 PC+ABS Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
-
- 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
- H01M10/63—Control systems
-
- 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
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/251—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for stationary devices, e.g. power plant buffering or backup power supplies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Automation & Control Theory (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a lithium battery for a solar street lamp, a heating control method thereof and the solar street lamp, belonging to the field of batteries and solar street lamps; the lithium battery pack is provided with a shell, a plastic upper cover, a waterproof nylon gram head, a plastic bottom cover, a heating film, a plurality of lithium ion battery cores, an intelligent solar street lamp controller and a BMS; the intelligent solar street lamp controller and the BMS adopt low-temperature charging control logic, and when the ambient temperature and the voltage of the solar photovoltaic panel meet preset low-temperature conditions in the process of realizing real-time control, management and protection on charging and discharging of the lithium battery for the solar street lamp, the external heating film is controlled to realize heating and the internal pulse charging is controlled to realize heating so as to improve the internal temperature of the lithium battery pack; compared with the prior art which only adopts an external heating mode, the invention can ensure the temperature uniformity in the lithium battery pack, reduce the energy loss, ensure excellent charging performance at low temperature and improve the energy utilization rate and the charging efficiency.
Description
Technical Field
The invention belongs to the field of batteries, and particularly relates to a lithium battery for a solar street lamp, a heating control method of the lithium battery and the solar street lamp.
Background
At present, a colloid lead-acid battery, a lithium iron phosphate battery and a ternary lithium battery are more used on the solar street lamp. Wherein, the colloid battery needs to be buried and is not friendly to the environment; the low-temperature performance of the lithium iron phosphate battery is poor, and the use area is limited; the ternary lithium battery has high energy density and poor heat resistance, and therefore, the three batteries have certain limitations in practical use.
The lithium battery has the advantages of high energy density, long cycle life, small volume, convenient installation and the like, so the lithium battery is a preferred battery type of the solar street lamp at present, however, the internal resistance of the battery can be increased sharply in a low-temperature state, and the output power and the available energy are greatly reduced; in addition, the battery is difficult to charge with electric energy at low temperature, lithium dendrites are easy to generate during charging, and safety hazard is easy to be caused, so that the use of the lithium battery in a cold environment is greatly limited.
At present, an effective method for improving the performance of a lithium battery in a low-temperature environment is to preheat the lithium battery, and common methods include a method for heating a heating film and the like from outside, wherein the battery is required to be heated through contact conduction, air convection and other ways, and larger space and higher cost are required. In addition, external heating tends to create a temperature gradient in the battery pack, and most of the energy is dissipated, resulting in extremely low energy utilization efficiency.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a lithium battery for a solar street lamp, a heating control method thereof and the solar street lamp. The technical problems to be solved by the invention are realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a lithium battery for a solar street lamp, where a lithium battery pack is electrically connected to an LED lamp body and a solar photovoltaic panel in the solar street lamp, respectively, where:
the lithium battery pack is provided with a shell, two symmetrical ends of the shell are provided with openings, one end of the shell is provided with a plastic upper cover, and the other end of the shell is provided with a plastic bottom cover; a heating film is arranged on the inner wall of the shell; a plurality of lithium ion battery cores are assembled in the heating film; the plastic upper cover is provided with a waterproof nylon Long Gelan head; an intelligent solar street lamp controller and a BMS are sequentially arranged on one side, facing the shell, of the plastic upper cover; the intelligent solar street lamp controller and the BMS are electrically connected and information interacted through communication interfaces respectively arranged;
the intelligent solar street lamp controller is used for controlling, managing and protecting the charging and discharging of the lithium battery for the solar street lamp in real time, and comprises the step of controlling an external heating film to realize heating and the step of controlling the internal pulse charging to realize heating to improve the temperature inside the lithium battery pack when the ambient temperature and the voltage of the solar photovoltaic panel meet the preset low-temperature condition.
In one embodiment of the invention, the intelligent solar street lamp controller comprises a central processing module, and a charging management module, a discharging management module, a timing module, a temperature management module and a communication management module which are respectively connected with the central processing module; wherein,,
the charging management module and the discharging management module are used for monitoring and managing the lithium battery pack in real time when the lithium battery pack is charged and discharged;
the temperature management module is used for detecting the temperature signal and managing the temperature;
the central processing module is used for measuring and analyzing the voltage signal of the solar photovoltaic panel to judge the switch of the LED lamp body; the intelligent solar street lamp controller is used for controlling the charge and discharge temperature of the intelligent solar street lamp controller by processing signals fed back by the temperature management module;
the timing module is used for realizing the switching time and the power conversion working time of the LED lamp body through time setting;
the communication management module comprises a communication interface.
In one embodiment of the present invention, the BMS includes a charge and discharge control circuit, a temperature management circuit, and a communication management circuit; wherein,,
the charging and discharging control circuit is used for monitoring and managing the lithium battery pack in real time when the lithium battery pack is charged and discharged;
the temperature management circuit is used for detecting the temperature signal and managing the temperature;
the communication management circuit comprises a communication interface.
In one embodiment of the invention, the BMS is provided with three paths of NTC temperature probes for detecting the temperature of the heating film, the temperature of the lithium ion battery core and the ambient temperature respectively.
In a second aspect, an embodiment of the present invention provides a heating control method for a lithium battery for a solar street lamp, which is applied to the lithium battery for a solar street lamp in the first aspect, and the method includes:
step 1, feeding back to a BMS when an intelligent solar street lamp controller detects that the voltage of a solar photovoltaic panel is higher than a first set threshold value; the BMS judges whether the detected ambient temperature is lower than a first set value, if yes, a heating mode is started, a charging loop in the BMS is closed, and the lithium ion battery core is not charged; if not, not starting a heating mode and starting a charging loop in the BMS;
step 2, after a heating mode is started, the solar photovoltaic panel supplies power to the heating film through the intelligent solar street lamp controller so as to enable the heating film to work; in the working process of the heating film, the BMS is utilized to detect the temperature of the lithium ion battery core in real time, if the temperature reaches a set temperature threshold value, the working of the heating film is stopped, a charging loop in the BMS is opened, and the lithium ion battery core is charged in a pulse mode to heat the interior of the lithium ion battery core; meanwhile, in the working process of the heating film, the BMS is utilized to detect the temperature of the heating film in real time, and if the temperature exceeds a set temperature value, the working of the heating film is stopped;
step 3, feeding back to the BMS when the intelligent solar street lamp controller detects that the voltage of the solar photovoltaic panel is lower than a second set threshold value, stopping pulse charging by the BMS, and starting a constant-current constant-voltage charging mode to charge the lithium ion battery core;
step 4, feeding back to the BMS when the intelligent solar street lamp controller detects that the voltage of the solar photovoltaic panel is higher than a third set threshold value; and the BMS judges whether the detected ambient temperature is lower than a second set value; if yes, the BMS closes a charging loop of the BMS, and stops the charging process of the constant-current constant-voltage charging mode; if not, maintaining the charging process of the constant-current constant-voltage charging mode.
In one embodiment of the present invention, during the pulse charging process, the ratio of the charging duration to the gap duration is 7:2.
In one embodiment of the present invention, the magnitude relation among the first set threshold, the second set threshold and the third set threshold is: the first set threshold value is larger than the third set threshold value and larger than the second set threshold value.
In one embodiment of the present invention, the range of the first set point includes-7 ℃ to-5 ℃; the range of the set temperature value comprises 30-35 ℃; the range of the set temperature threshold value comprises 5-10 ℃; the range of the second set value comprises-3 ℃ to 0 ℃.
In a third aspect, the embodiment of the invention provides a solar street lamp, which comprises an LED lamp body, a solar photovoltaic panel and a lithium battery pack; the lithium battery pack is electrically connected with the LED lamp body and the solar photovoltaic panel respectively; the lithium battery pack is realized by a lithium battery based on the solar street lamp of the first aspect; the heating method of the lithium battery pack is realized by adopting the heating control method of the lithium battery for the solar street lamp.
In one embodiment of the present invention, the working process of the solar street lamp includes:
when the illumination intensity meets the preset strong illumination condition, the solar photovoltaic panel charges the lithium battery pack through the intelligent solar street lamp controller, and converts light energy into chemical energy to be stored in the lithium battery pack;
when the illumination intensity meets the preset weak illumination condition, the lithium battery pack discharges the LED lamp body through the intelligent solar street lamp controller to realize illumination.
The invention has the beneficial effects that:
according to the lithium battery for the solar street lamp, the heating control method of the lithium battery for the solar street lamp and the solar street lamp, the lithium battery is used as a power supply of an LED lamp body in the solar street lamp, and the lithium battery has the advantage of high use cycle times; the intelligent solar street lamp controller and the BMS are arranged in the lithium battery pack, real-time control and dual management can be realized on charging and discharging of the lithium battery pack, when the ambient temperature and the voltage of the solar photovoltaic panel meet preset low-temperature conditions, an external heating film is controlled to realize heating and internal pulse charging is controlled to realize heating so as to improve the temperature inside the lithium battery pack, a corresponding threshold value is set according to the voltage of the solar photovoltaic panel and the ambient temperature of the BMS, and when the lithium battery pack is confirmed to really meet the low-temperature conditions, the external heating film is controlled to realize heating and the internal pulse charging is controlled to realize heating so as to improve the temperature inside the lithium battery pack; compared with the prior art which simply adopts an external heating mode, the embodiment of the invention combines pulse charging to generate Joule heat to heat the lithium battery pack internally, the provided heating system has a simple structure, can ensure uniform temperature in the lithium battery pack, can reduce energy loss, can ensure excellent charging performance in low-temperature scenes such as areas with lower air temperature or winter, can improve energy utilization rate and charging efficiency, is safe and reliable, has high intelligent degree, and can prolong the service life of the battery and save cost.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery pack in a lithium battery for a solar street lamp according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a heating control method of a lithium battery for a solar street lamp according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a solar street lamp according to an embodiment of the present invention;
reference numerals:
1-waterproof nylon Long Gelan head; 2-a plastic upper cover; 3-an intelligent solar street lamp controller; 4-BMS; 5-a shell; 6, a communication interface; 7-a solar photovoltaic panel; 8-an LED lamp body; 9-heating the film; 10-lithium ion battery core; 11-a plastic bottom cover.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In a first aspect, an embodiment of the present invention provides a lithium battery for a solar street lamp, where a lithium battery pack is electrically connected to an LED lamp body and a solar photovoltaic panel in the solar street lamp, respectively, where:
the lithium battery pack is provided with a shell, two symmetrical ends of the shell are provided with openings, one end of the shell is provided with a plastic upper cover, and the other end of the shell is provided with a plastic bottom cover; a heating film is arranged on the inner wall of the shell; a plurality of lithium ion battery cores are assembled in the heating film; the plastic upper cover is provided with a waterproof nylon Long Gelan head; an intelligent solar street lamp controller and a BMS (Battery Management System ) are sequentially arranged on one side of the plastic upper cover, which faces the shell; the intelligent solar street lamp controller and the BMS are electrically connected and information interacted through communication interfaces respectively arranged;
the intelligent solar street lamp controller is used for controlling, managing and protecting the charging and discharging of the lithium battery for the solar street lamp in real time, and comprises the step of controlling an external heating film to realize heating and the step of controlling the internal pulse charging to realize heating to improve the temperature inside the lithium battery pack when the ambient temperature and the voltage of the solar photovoltaic panel meet the preset low-temperature condition.
For connection relation between the lithium battery pack and the LED lamp body and connection relation between the lithium battery pack and the solar photovoltaic panel, refer to the following description.
For the lithium battery pack, the shell can be prepared from aluminum profiles or PC+ABS and the like, and specific materials are not particularly limited. The plastic upper cover and the plastic bottom cover positioned on the two sides of the shell play a role in sealing. Waterproof nylon Long Gelan head is used for sealing and waterproofing. The heating film may be a PET heating film, PI heating film, or the like, and is not limited herein.
The embodiment of the invention adopts the lithium battery pack as a power supply of the solar street lamp. In the installation process, the output voltage and capacity can be replaced by increasing or decreasing the lithium ion battery cells and replacing the lithium ion battery cells with different capacities.
The intelligent solar street lamp controller and the BMS are used for realizing real-time control, management and protection on charging and discharging of the lithium battery for the solar street lamp.
In an optional implementation manner, the intelligent solar street lamp controller comprises a central processing module, and a charging management module, a discharging management module, a timing module, a temperature management module and a communication management module which are respectively connected with the central processing module; wherein,,
the charging management module and the discharging management module are used for monitoring and managing the lithium battery pack in real time when the lithium battery pack is charged and discharged;
the temperature management module is used for detecting the temperature signal and managing the temperature;
the central processing module is used for measuring and analyzing the voltage signal of the solar photovoltaic panel to judge the switch of the LED lamp body; the intelligent solar street lamp controller is used for controlling the charge and discharge temperature of the intelligent solar street lamp controller by processing signals fed back by the temperature management module;
the timing module is used for realizing the switching time and the power conversion working time of the LED lamp body through time setting;
the communication management module comprises a communication interface and is used for communicating with the BMS.
The specific working processes and circuit structures of the charging management module, the discharging management module, the timing module, the temperature management module and the communication management module can be understood by referring to related technologies, and any circuit structure capable of realizing corresponding functions can be included in the protection scope of the embodiment of the present invention, which is not specifically described herein.
In an alternative embodiment, the BMS includes a charge and discharge control circuit, a temperature management circuit, and a communication management circuit; wherein,,
the charging and discharging control circuit is used for monitoring and managing the lithium battery pack in real time when the lithium battery pack is charged and discharged;
the temperature management circuit is used for detecting the temperature signal and managing the temperature;
the communication management circuit comprises a communication interface and is used for communicating with the intelligent solar street lamp controller.
The specific working processes and circuit structures of the charge-discharge control circuit, the temperature management circuit, the communication management circuit and the like can be understood by referring to the related technologies, and any circuit structure capable of realizing the corresponding functions can be included in the protection scope of the embodiment of the present invention, and no specific description is given here.
Wherein, BMS is equipped with three routes NTC temperature probe, is used for detecting the temperature of heating membrane, the temperature of lithium ion battery core and ambient temperature respectively.
The working principle of the lithium battery pack is summarized as follows:
in the period of high illumination intensity such as daytime, the solar photovoltaic panel charges the lithium battery pack through the intelligent solar street lamp controller, and light energy is converted into chemical energy to be stored in the lithium battery pack. And in the period of low illumination intensity or small visible light such as evening, the lithium battery pack discharges the LED lamp body through the intelligent solar street lamp controller to realize illumination.
The intelligent solar street lamp controller can adjust when the street lamp is lighted, control the duration of lighting and power etc. that lights, no matter in daytime or at night, intelligent solar street lamp controller and BMS in the lithium cell group all play the guard action to the battery, prevent that the adverse circumstances such as lithium cell group overcharge, overdischarge, short circuit, overtemperature from taking place. For the implementation of the above functions, please understand in conjunction with the related art, and detailed description thereof will not be provided herein.
Meanwhile, when the ambient temperature and the voltage of the solar photovoltaic panel meet the preset low-temperature condition, the external heating film is controlled to heat and the internal pulse charging is controlled to heat so as to raise the temperature inside the lithium battery pack. Specifically, the intelligent solar street lamp controller and the BMS can set corresponding threshold values according to the ambient temperature and the voltage of the solar photovoltaic panel, the intelligent solar street lamp controller and the BMS follow low-temperature charging control logic, and the intelligent solar street lamp controller and the BMS generate Joule heat through external heating film heating and internal pulse charging, so that the temperature in the lithium battery pack is uniformly increased under the combined action.
For the control logic of low-temperature charging, please refer to the specific content of the heating control method of the lithium battery for the solar street lamp described below.
The lithium battery for the solar street lamp provided by the embodiment of the invention is used as a power supply of an LED lamp body in the solar street lamp, and has the advantage of high use cycle times; the intelligent solar street lamp controller and the BMS are arranged in the lithium battery pack, real-time control and dual management can be realized on charging and discharging of the lithium battery pack, when the ambient temperature and the voltage of the solar photovoltaic panel meet preset low-temperature conditions, the external heating film is controlled to realize heating and the internal pulse charging is controlled to realize heating so as to improve the low-temperature charging control logic of the internal temperature of the lithium battery pack.
In a second aspect, an embodiment of the present invention provides a heating control method for a lithium battery for a solar street lamp, which is applied to the lithium battery for a solar street lamp provided in the first aspect, referring to fig. 2, and the method includes:
step 1, feeding back to a BMS when an intelligent solar street lamp controller detects that the voltage of a solar photovoltaic panel is higher than a first set threshold value; the BMS judges whether the detected ambient temperature is lower than a first set value, if yes, a heating mode is started, a charging loop in the BMS is closed, and the lithium ion battery core is not charged; if not, not starting a heating mode and starting a charging loop in the BMS;
as will be appreciated by those skilled in the art, the solar photovoltaic panel is disposed outside the lithium battery pack, and the voltage value increases as the ambient temperature to which the solar photovoltaic panel is exposed becomes lower. The preset voltage of the solar photovoltaic panel is higher than the first set threshold, which represents that the outside of the lithium battery pack reaches a corresponding preset low-temperature condition, wherein the first set threshold can be reasonably set by measuring the voltage of the solar photovoltaic panel through experiments according to a temperature value set by the outside of the lithium battery pack reaching the corresponding preset low-temperature condition in a use scene, for example, the first set threshold can be 24.47V-24.53V, and the like.
When the intelligent solar street lamp controller detects that the voltage of the solar photovoltaic panel is higher than the first set threshold, the intelligent solar street lamp controller can only determine that the outside of the lithium battery pack reaches the corresponding preset low-temperature condition, but not represent that the inside of the lithium battery pack also reaches the corresponding preset low-temperature condition, so that whether the lithium battery pack meets the low-temperature condition cannot be truly determined. Therefore, in order to accurately determine, in the embodiment of the invention, after determining that the voltage of the solar photovoltaic panel is higher than the first set threshold, it is further required to determine whether the environmental temperature where the BMS is located is lower than the first set value, if so, it is determined that the interior of the lithium battery pack reaches the corresponding preset low temperature condition, and then it is determined that the lithium battery pack really meets the low temperature condition. The first set value may be set according to a preset low temperature condition corresponding to the internal of the lithium battery pack in the usage scenario, for example, in an optional implementation manner, the range of the first set value may include-7 ℃ to-5 ℃, and so on.
The intelligent solar street lamp controller is used for detecting the voltage of the solar photovoltaic panel in real time and comparing the voltage with a first set threshold value, and feeding back the information to the BMS when the voltage of the solar photovoltaic panel is higher than the first set threshold value. The BMS detects its ambient temperature in real time using an internal NTC temperature probe and compares it with a first set point.
If the environmental temperature of the BMS is lower than a first set value, determining that the interior of the lithium battery pack also reaches a corresponding preset low-temperature condition, determining that the lithium battery pack really meets the low-temperature condition at the moment, starting a heating mode by the BMS to heat the lithium battery pack, closing a charging loop in the BMS, and not charging a lithium ion battery core during heating;
if the ambient temperature of the BMS is not lower than the first set value, it is determined that the lithium battery pack does not really meet the low-temperature condition, heating of the lithium battery pack is not needed, a heating mode is not started, a charging loop in the BMS is started, the lithium battery pack is not heated, and the lithium ion battery cells are charged.
Step 2, after a heating mode is started, the solar photovoltaic panel supplies power to the heating film through the intelligent solar street lamp controller so as to enable the heating film to work; in the working process of the heating film, the BMS is utilized to detect the temperature of the lithium ion battery core in real time, if the temperature reaches a set temperature threshold value, the working of the heating film is stopped, a charging loop in the BMS is opened, and the lithium ion battery core is charged in a pulse mode to heat the interior of the lithium ion battery core; meanwhile, in the working process of the heating film, the BMS is utilized to detect the temperature of the heating film in real time, and if the temperature exceeds a set temperature value, the working of the heating film is stopped;
the power supply to the heating film and the operation of the heating film are understood in conjunction with the related art, and will not be described in detail herein. It should be noted that, in the embodiment of the present invention, after the heating film starts to work, on one hand, the temperature of the lithium ion battery core is detected in real time by using the NTC temperature probe in the BMS, and if the temperature reaches the set temperature threshold, the work of the heating film is stopped; wherein, the set temperature threshold is set according to the required temperature of the outer surface of the lithium ion battery core, and represents the heating target of the heating film, for example, in an optional implementation manner, the range of the set temperature threshold can include 5-10 ℃. On the other hand, the temperature of the heating film is detected in real time by utilizing an NTC temperature probe in the BMS, if the temperature exceeds a set temperature value, a heating loop is cut off, and the operation of the heating film is stopped, so that the heating is prevented from being out of control, and potential safety hazards are caused; wherein the set temperature value is determined according to the upper limit of the safe working temperature of the heating film, and represents the limit safe temperature, for example, in an optional implementation manner, the range of the set temperature value can comprise 30-35 ℃ and the like; wherein the set temperature threshold is less than the set temperature value.
The embodiment of the invention considers that the detected temperature of the lithium ion battery core reaches the set temperature threshold value and does not represent that the temperature of the lithium ion battery core reaches the heating target, because the NTC temperature probe in the BMS detects the temperature of the lithium ion battery core, the temperature of the surface of the lithium ion battery core is detected, but the internal temperature of the lithium ion battery core cannot be detected, and the purpose of heating the lithium ion battery core is to enable the internal temperature to reach a certain target.
In an alternative embodiment, in the pulse charging process, the ratio of the charging duration to the gap duration may be 7:2. On the one hand, the lithium ion battery core can be charged and heated, so that the potential safety hazard of low-temperature charging is reduced, namely the risk of lithium precipitation generated by low-temperature charging is reduced; the other party can also improve the efficiency of the subsequent constant current constant voltage charging through a pulse type charging mode.
Of course, the ratio of the charge period to the gap period is not limited to the above.
Step 3, feeding back to the BMS when the intelligent solar street lamp controller detects that the voltage of the solar photovoltaic panel is lower than a second set threshold value, stopping pulse charging by the BMS, and starting a constant-current constant-voltage charging mode to charge the lithium ion battery core;
the second set threshold may be set reasonably according to the voltage of the solar photovoltaic panel measured by experiments after the lithium battery pack reaches the chargeable temperature in the usage scenario, for example, in an optional implementation manner, the second set threshold may be 22.79V-22.83V, and so on.
When the voltage of the solar photovoltaic panel is higher than a second set threshold value, the BMS stops pulse charging and ends the heating process of the lithium ion battery core, at the moment, the lithium battery pack does not meet the real low-temperature condition, and charging can be normally performed in the state, so that a constant-current constant-voltage charging mode is started to charge the lithium ion battery core.
Step 4, feeding back to the BMS when the intelligent solar street lamp controller detects that the voltage of the solar photovoltaic panel is higher than a third set threshold value; and the BMS judges whether the detected ambient temperature is lower than a second set value; if yes, the BMS closes a charging loop of the BMS, and stops the charging process of the constant-current constant-voltage charging mode; if not, maintaining the charging process of the constant-current constant-voltage charging mode.
The voltage of the solar photovoltaic panel being higher than a third set threshold represents a use scene with lower illumination intensity or small visibility, such as evening; the third set threshold may be set appropriately by measuring the voltage of the solar photovoltaic panel by experiment under specific use scenario, for example, in an alternative embodiment, the third set threshold may be 24.05V to 24.11V, and so on.
In an alternative embodiment, the magnitude relation among the first set threshold, the second set threshold and the third set threshold is: the first set threshold value is larger than the third set threshold value and larger than the second set threshold value.
When the voltage of the solar photovoltaic panel is higher than a third set threshold, the use scene of the solar photovoltaic panel is possibly unsuitable for charging operation, and whether the environmental temperature of the BMS is lower than a second set value is still needed to be further judged, because potential safety hazards exist in charging the battery when the temperature is low, lithium is easily separated from the low-temperature rechargeable lithium ion battery, lithium dendrites are formed, and a diaphragm is pierced, so that an internal short circuit is formed; if the environmental temperature of the BMS is lower than the second set value, the BMS represents that the interior of the lithium battery pack reaches a corresponding preset low-temperature condition, and at the moment, the charging is stopped for the performance and the charging effect of the battery; if the ambient temperature at which the BMS is located is not lower than the second set value, the charging may be continued. The second set value may be set according to a preset low temperature condition corresponding to the internal of the lithium battery pack in a use scene with low illumination intensity or small visibility, for example, in an optional implementation manner, the range of the second set value may include-3 ℃ to 0 ℃ and so on.
The steps of the embodiment of the invention provide a control logic for low-temperature charging, corresponding threshold values are set according to the voltage of a solar photovoltaic panel and the environmental temperature of a BMS, and when the fact that the lithium battery pack really meets low-temperature conditions is confirmed, an external heating film is controlled to realize heating and an internal pulse type charging is controlled to realize heating so as to improve the internal temperature of the lithium battery pack; compared with the prior art which simply adopts an external heating mode, the embodiment of the invention combines pulse charging to generate Joule heat to heat the interior of the lithium battery pack, can ensure the temperature uniformity in the lithium battery pack, reduce energy loss, ensure excellent charging performance in low-temperature scenes such as areas with lower air temperature or winter, improve the energy utilization rate and the charging efficiency, and is safe, reliable, high in intelligent degree, and capable of prolonging the service life of the battery and saving the cost.
Aiming at the heating control method of the lithium battery for the solar street lamp, which is provided by the embodiment of the invention, the working process of the lithium battery can be as follows:
in the daytime, the lithium battery pack is charged through the solar photovoltaic panel, when the ambient temperature and the voltage of the solar photovoltaic panel reach corresponding set thresholds, the intelligent solar street lamp controller and the BMS follow control logic of low-temperature charging, the lithium battery pack is heated by the heating film preferentially, after the heating temperature reaches the set temperature thresholds, the heating film heating function is closed, the pulse type charging is started to perform internal heating, and when the voltage of the solar photovoltaic panel reaches the charging starting function, the heating is stopped and the charging is started; at night, the LED lamp body is discharged through the lithium battery pack, so that the street lamp illumination is realized. The lithium battery pack is used as a power supply, and has the characteristics of excellent low-temperature performance and high low-temperature charging efficiency; an intelligent solar street lamp controller and a BMS are arranged in the lithium battery pack, so that the charging and discharging of the lithium battery are controlled in real time, the switching time of the street lamp is adjusted at any time, the problems of overcharge, overdischarge, over-temperature and short circuit of the lithium battery are prevented, and the intelligent degree is high; the control logic for charging in the low-temperature environment is adjusted in real time according to the temperature of the environment, so that the lithium battery has double protection, safety and reliability, the working time and the service life of the lithium battery can be greatly prolonged, and the use cost is saved.
In a third aspect, the embodiment of the invention provides a solar street lamp, which comprises an LED lamp body, a solar photovoltaic panel and a lithium battery pack; the lithium battery pack is electrically connected with the LED lamp body and the solar photovoltaic panel respectively; the lithium battery pack is realized by a lithium battery based on the solar street lamp of the first aspect; the heating method of the lithium battery pack is realized by adopting the heating control method of the lithium battery for the solar street lamp.
The connection relationship between the LED lamp body, the solar photovoltaic panel and the lithium battery pack is shown in fig. 3. Wherein the middle two box parts represent a lithium battery.
The working process of the solar street lamp can comprise the following steps:
when the illumination intensity meets the preset strong illumination condition, the solar photovoltaic panel charges the lithium battery pack through the intelligent solar street lamp controller, and converts light energy into chemical energy to be stored in the lithium battery pack;
when the illumination intensity meets the preset weak illumination condition, the lithium battery pack discharges the LED lamp body through the intelligent solar street lamp controller to realize illumination.
The light intensity satisfies a preset strong light condition, for example, daytime, and the light intensity satisfies a preset weak light condition, for example, evening, night, etc.
By combining the main working mechanism of the solar street lamp with the figures 1 and 3, when the LED lamp body is charged by the solar photovoltaic panel in sunny day, the lithium battery pack controls the voltage during charging by the intelligent solar street lamp controller, so that the solar photovoltaic panel can be used for conveying stable voltage to the lithium battery pack during charging; meanwhile, the BMS prevents the lithium battery pack from being overcharged through the protection circuit, and when the lithium battery pack is full of electric energy, the BMS protection circuit automatically cuts off the charging circuit to protect the safety service performance of the lithium battery pack. When the lithium battery pack detects that the voltage of the solar photovoltaic panel reaches a set value through an internal intelligent solar street lamp controller in evening or in dark weather, for example, when the voltage is lower than 5V, and the like, a central processing module of the intelligent solar street lamp controller automatically turns on the street lamp to illuminate the surrounding. In the illumination process, the BMS prevents the lithium battery pack from overdischarging through the protection circuit, so that the lithium battery pack outputs continuous and stable power to the LED lamp body. In addition, the switch of the LED lamp body can be controlled by the timing device of the timing module, and the working time of the LED lamp body and the lighting power conversion is controlled according to the switch time set in the central processing module.
The embodiment of the invention uses the lithium battery as a power supply, has high using cycle times, is internally provided with the intelligent solar street lamp controller and the BMS, and can realize real-time control and double management on charging and discharging of the lithium battery; the lithium battery pack is internally heated by generating Joule heat through pulse charging, so that the heating system is simple in structure, energy loss can be reduced, temperature uniformity in the battery pack is ensured, charging efficiency and energy utilization efficiency are improved, safety and reliability are realized, the intelligent degree is high, the service life of the battery can be prolonged, and cost is saved.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (10)
1. The lithium battery for the solar street lamp is characterized in that a lithium battery pack is respectively electrically connected with an LED lamp body and a solar photovoltaic panel in the solar street lamp, wherein:
the lithium battery pack is provided with a shell, two symmetrical ends of the shell are provided with openings, one end of the shell is provided with a plastic upper cover, and the other end of the shell is provided with a plastic bottom cover; a heating film is arranged on the inner wall of the shell; a plurality of lithium ion battery cores are assembled in the heating film; the plastic upper cover is provided with a waterproof nylon Long Gelan head; an intelligent solar street lamp controller and a BMS are sequentially arranged on one side, facing the shell, of the plastic upper cover; the intelligent solar street lamp controller and the BMS are electrically connected and information interacted through communication interfaces respectively arranged;
the intelligent solar street lamp controller is used for controlling, managing and protecting the charging and discharging of the lithium battery for the solar street lamp in real time, and comprises the step of controlling an external heating film to realize heating and the step of controlling the internal pulse charging to realize heating to improve the temperature inside the lithium battery pack when the ambient temperature and the voltage of the solar photovoltaic panel meet the preset low-temperature condition.
2. The lithium battery for the solar street lamp according to claim 1, wherein the intelligent solar street lamp controller comprises a central processing module, and a charging management module, a discharging management module, a timing module, a temperature management module and a communication management module which are respectively connected with the central processing module; wherein,,
the charging management module and the discharging management module are used for monitoring and managing the lithium battery pack in real time when the lithium battery pack is charged and discharged;
the temperature management module is used for detecting the temperature signal and managing the temperature;
the central processing module is used for measuring and analyzing the voltage signal of the solar photovoltaic panel to judge the switch of the LED lamp body; the intelligent solar street lamp controller is used for controlling the charge and discharge temperature of the intelligent solar street lamp controller by processing signals fed back by the temperature management module;
the timing module is used for realizing the switching time and the power conversion working time of the LED lamp body through time setting;
the communication management module comprises a communication interface.
3. The lithium battery for a solar street lamp according to claim 1 or 2, wherein the BMS comprises a charge and discharge control circuit, a temperature management circuit, and a communication management circuit; wherein,,
the charging and discharging control circuit is used for monitoring and managing the lithium battery pack in real time when the lithium battery pack is charged and discharged;
the temperature management circuit is used for detecting the temperature signal and managing the temperature;
the communication management circuit comprises a communication interface.
4. A lithium battery for a solar street lamp according to claim 3, wherein the BMS is provided with three NTC temperature probes for detecting the temperature of the heating film, the temperature of the lithium ion battery cell and the ambient temperature, respectively.
5. A heating control method of a lithium battery for a solar street lamp, applied to the lithium battery for a solar street lamp as claimed in any one of claims 1 to 4, the method comprising:
step 1, feeding back to a BMS when an intelligent solar street lamp controller detects that the voltage of a solar photovoltaic panel is higher than a first set threshold value; the BMS judges whether the detected ambient temperature is lower than a first set value, if yes, a heating mode is started, a charging loop in the BMS is closed, and the lithium ion battery core is not charged; if not, not starting a heating mode and starting a charging loop in the BMS;
step 2, after a heating mode is started, the solar photovoltaic panel supplies power to the heating film through the intelligent solar street lamp controller so as to enable the heating film to work; in the working process of the heating film, the BMS is utilized to detect the temperature of the lithium ion battery core in real time, if the temperature reaches a set temperature threshold value, the working of the heating film is stopped, a charging loop in the BMS is opened, and the lithium ion battery core is charged in a pulse mode to heat the interior of the lithium ion battery core; meanwhile, in the working process of the heating film, the BMS is utilized to detect the temperature of the heating film in real time, and if the temperature exceeds a set temperature value, the working of the heating film is stopped;
step 3, feeding back to the BMS when the intelligent solar street lamp controller detects that the voltage of the solar photovoltaic panel is lower than a second set threshold value, stopping pulse charging by the BMS, and starting a constant-current constant-voltage charging mode to charge the lithium ion battery core;
step 4, feeding back to the BMS when the intelligent solar street lamp controller detects that the voltage of the solar photovoltaic panel is higher than a third set threshold value; and the BMS judges whether the detected ambient temperature is lower than a second set value; if yes, the BMS closes a charging loop of the BMS, and stops the charging process of the constant-current constant-voltage charging mode; if not, maintaining the charging process of the constant-current constant-voltage charging mode.
6. The heating control method of the lithium battery for the solar street lamp according to claim 5, wherein the ratio of the charging duration to the gap duration is 7:2 in the pulse charging process.
7. The method according to claim 5 or 6, wherein the magnitude relation among the first set threshold, the second set threshold, and the third set threshold is: the first set threshold value is larger than the third set threshold value and larger than the second set threshold value.
8. The method for controlling the heating of a lithium battery for a solar street lamp according to claim 7, wherein,
the range of the first set value comprises-7 ℃ to-5 ℃; the range of the set temperature value comprises 30-35 ℃; the range of the set temperature threshold value comprises 5-10 ℃; the range of the second set value comprises-3 ℃ to 0 ℃.
9. The solar street lamp is characterized by comprising an LED lamp body, a solar photovoltaic panel and a lithium battery pack; the lithium battery pack is electrically connected with the LED lamp body and the solar photovoltaic panel respectively; the lithium battery pack is realized by a lithium battery based on the solar street lamp of any one of claims 1 to 4; the heating method of the lithium battery pack is realized by adopting the heating control method of the lithium battery for the solar street lamp according to any one of claims 5 to 8.
10. The solar street lamp of claim 9, wherein the solar street lamp operation comprises:
when the illumination intensity meets the preset strong illumination condition, the solar photovoltaic panel charges the lithium battery pack through the intelligent solar street lamp controller, and converts light energy into chemical energy to be stored in the lithium battery pack;
when the illumination intensity meets the preset weak illumination condition, the lithium battery pack discharges the LED lamp body through the intelligent solar street lamp controller to realize illumination.
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| CN120730578A (en) * | 2025-08-20 | 2025-09-30 | 广东活法科技有限公司 | Street light control method, device, equipment and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN120730578A (en) * | 2025-08-20 | 2025-09-30 | 广东活法科技有限公司 | Street light control method, device, equipment and medium |
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