CN106685012B - Lithium battery charging control system and working method thereof - Google Patents
Lithium battery charging control system and working method thereof Download PDFInfo
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- CN106685012B CN106685012B CN201710143137.6A CN201710143137A CN106685012B CN 106685012 B CN106685012 B CN 106685012B CN 201710143137 A CN201710143137 A CN 201710143137A CN 106685012 B CN106685012 B CN 106685012B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 460
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 460
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000009191 jumping Effects 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000004146 energy storage Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000010223 real-time analysis Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
Classifications
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H02J7/0026—
-
- 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
- H02J7/00302—Overcharge protection
-
- 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)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a lithium battery charging control system and a working method thereof, wherein the working method comprises the following steps: A. detecting state parameters of a lithium battery pack in real time, and calculating the extreme difference value of the voltage of a single lithium battery in the lithium battery pack; B. comparing the difference value with a predetermined first threshold; C. when the limit value is larger than the first threshold value, independently charging the lithium battery with the lowest voltage in the lithium battery pack; D. when the voltage of the independently charged lithium battery reaches the voltage of the lithium battery with the highest voltage in the lithium battery pack, stopping independent charging and jumping to execute the step A; E. and when the limit value is smaller than or equal to the first threshold value, the lithium battery pack is charged as a whole until the charging is completed. According to the technical scheme, the charging mode is controlled to ensure uniform charging of the battery, so that the charging of the lithium battery is safer, the safety of a lithium battery product is greatly improved, and the service life of the lithium battery product is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of lithium ion battery charging, in particular to a lithium battery charging control system and a working method thereof.
Background
The electric energy using modes of solar power generation are generally as follows: one is to directly integrate the electric energy obtained by solar power generation into a power grid; the other type of solar energy is to store the electric energy generated by solar energy in daytime, and then discharge the electric energy through the storage battery for power supply (such as night road illumination or household electricity). With the increasing generation of solar energy, the second use mode is more and more widely used under the limitation of national grid power facilities, and therefore, the storage of electric energy (i.e. energy storage) is an indispensable part.
In the traditional energy storage, the lead-acid storage battery has high use specific gravity, but with the development of secondary battery technology and the increasing of environmental protection requirements, the lithium ion battery with high energy density, long service life and environmental protection and no pollution is greatly popularized and applied gradually, and the cost performance advantage of the lead-acid storage battery in the solar energy storage field is gradually lost.
One of the important problems in the application process of the lithium battery in solar energy storage is the safety problem; since the solar charging current is small and the lithium battery is used as a lithium battery pack formed by connecting a plurality of lithium batteries in series and/or in parallel, the safety problem of the lithium battery is mainly concentrated in the field of deterioration of consistency of the series battery and overcharge. The typical characteristic of the lithium battery is that effective control and protection are needed in the charging and discharging process, but all control systems applied to solar energy storage in the market at present are derived from the control mode of the lead-acid battery, and the requirement characteristic of the lithium battery in the application process is not really solved. The method is mainly characterized in that:
first, lead-acid batteries only affect the service life in the event of an overall or individual overcharge and overdischarge, no safety problems occur, but any one of the lithium batteries is overcharged or overdischarged, which leads to safety problems. Even if the battery has a protection system, if the energy of each lithium battery is inconsistent, the service time of the lithium battery is affected, and a lithium battery with a slightly high/low voltage is frequently in a slightly overcharged/overdischarged state, so that a safety accident is caused when the lithium battery is used for a long time.
Second, conventional control systems only protect the total voltage of the battery system, and cannot protect and manage the voltage of a single lithium battery.
Disclosure of Invention
The invention mainly aims to provide a working method of a lithium battery charging control system, which aims to ensure that the charging of a lithium battery is safer and the safety of a lithium battery product is improved.
In order to achieve the above purpose, the lithium battery charging control system provided by the invention is connected with a photovoltaic panel and a lithium battery pack, and comprises a processor, a direct charging module, a single charging module and a detection module;
one path of the photovoltaic panel is connected with the lithium battery pack through the direct charging module, and the other path of the photovoltaic panel is connected with the single charging module;
the detection module is respectively connected with the processor and the lithium battery pack, and is used for detecting state parameters of the lithium battery pack in real time and feeding back the state parameters to the processor, wherein the state parameters comprise voltages of all lithium batteries;
the processor is respectively connected with the direct charging module and the single charging module, and respectively sends corresponding signals to the direct charging module and the single charging module according to the state parameters fed back by the detection module;
the direct charging module is conducted or disconnected according to signals output by the processor;
the single charging module is respectively connected with each lithium battery of the lithium battery pack, and the single charging module respectively adjusts the connection on-off state of each lithium battery according to signals output by the processor.
Preferably, the state parameter includes a temperature of the lithium battery pack, and the lithium battery charging control system further includes a heating module connected to the processor, the heating module being used for heating the lithium battery of the lithium battery pack; and the processor controls whether the heating module works or not according to the temperature of the lithium battery pack fed back by the detection module.
The invention also provides a working method based on the lithium battery charging control system, which comprises the following steps:
A. detecting state parameters of a lithium battery pack in real time, and calculating the extreme difference value of the voltage of a single lithium battery in the lithium battery pack, wherein the state parameters comprise the voltage of each lithium battery in the lithium battery pack;
B. comparing the difference value with a predetermined first threshold;
C. when the limit value is larger than the first threshold value, independently charging the lithium battery with the lowest voltage in the lithium battery pack;
D. when the voltage of the independently charged lithium battery reaches the voltage of the lithium battery with the highest voltage in the lithium battery pack, stopping independent charging and jumping to execute the step A;
E. and when the polar difference value is smaller than or equal to the first threshold value, the lithium battery pack is charged as a whole.
Preferably, the step a and the step B further include:
comparing the difference value with a predetermined second threshold;
b, executing the step B when the limit value is smaller than or equal to the second threshold value;
and executing preset emergency operation when the limit value is larger than the second threshold value.
Preferably, the step B is replaced by:
detecting the voltage of the photovoltaic panel when the polar difference value is smaller than or equal to the second threshold value, and comparing the detected voltage of the photovoltaic panel with a predetermined third threshold value;
and B, executing the step when the voltage of the photovoltaic panel is larger than or equal to the third threshold value.
Preferably, the state parameter further includes a temperature of the lithium battery pack, and the step B is replaced by:
comparing the detected temperature of the lithium battery pack with a predetermined temperature threshold when the voltage of the photovoltaic panel is greater than or equal to the third threshold;
b, executing the step when the temperature of the lithium battery pack is greater than the temperature threshold;
and when the temperature of the lithium battery pack is less than or equal to the temperature threshold value, heating the lithium battery pack.
Preferably, the step a and the step B further include:
detecting a voltage of the photovoltaic panel and comparing the detected voltage of the photovoltaic panel with a predetermined third threshold;
and B, executing the step when the voltage of the photovoltaic panel is larger than or equal to the third threshold value.
Preferably, the working method further comprises:
and controlling the lithium battery pack to discharge when the voltage of the photovoltaic panel is smaller than the third threshold value.
Preferably, the state parameter further includes a temperature of the lithium battery pack, and the step a and the step B further include:
comparing the detected temperature of the lithium battery pack with a predetermined temperature threshold;
b, executing the step when the temperature of the lithium battery pack is greater than the temperature threshold;
and when the temperature of the lithium battery pack is less than or equal to the temperature threshold value, heating the lithium battery pack.
Preferably, the step C includes:
when the polar difference value is larger than the first threshold value, acquiring the current voltage of each lithium battery;
independently charging the lithium battery corresponding to the obtained lowest voltage by adopting a constant voltage, wherein the size of the constant voltage is equal to that of the obtained highest voltage;
the step D comprises the following steps:
monitoring the voltage of the independently charged lithium battery in real time, and comparing the voltage of the independently charged lithium battery with the acquired highest voltage;
and (C) when the voltage of the independently charged lithium battery is greater than or equal to the acquired highest voltage, stopping the independent charging and jumping to execute the step (A).
According to the technical scheme, by adopting the real-time analysis of the extreme value of the voltage of a single lithium battery in the lithium battery pack, whether the consistency of the serial lithium batteries in the lithium battery pack meets the requirement is determined, and under the condition that the consistency of the serial lithium batteries in the lithium battery pack does not meet the requirement, the lithium battery with the lowest voltage in the lithium battery pack is controlled to be charged independently, so that the pressure difference among the lithium batteries in the lithium battery pack is balanced, the consistency of the serial lithium batteries in the lithium battery pack is improved, and the control is switched to the integral charging of the lithium battery pack until the consistency of the serial lithium batteries in the lithium battery pack meets the requirement; therefore, the situation that the lithium battery is overcharged or overdischarged due to the fact that the voltage of the individual lithium battery in the lithium battery pack is too high/too low is avoided, the safety management of the lithium battery in the lithium battery pack is achieved, safety accidents caused by the overcharge/overdischarge are avoided, and the use safety of a lithium battery product is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a lithium battery charge control system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a first embodiment of a method of operating a lithium battery charge control system according to the present invention;
FIG. 3 is a flowchart of a second embodiment of a method of operating a lithium battery charge control system according to the present invention;
FIG. 4 is a flowchart of a third embodiment of a method of operating a lithium battery charge control system according to the present invention;
FIG. 5 is a flowchart of a fourth embodiment of a method of operating a lithium battery charge control system according to the present invention;
FIG. 6 is a flowchart of a fifth embodiment of a method of operating a lithium battery charge control system according to the present invention;
fig. 7 is a flowchart illustrating a sixth embodiment of a method for operating a lithium battery charge control system according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. 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.
The invention provides a lithium battery charging control system, which is connected with a photovoltaic panel 20 and a lithium battery pack 30 (refer to fig. 1), and is mainly used for controlling the photovoltaic panel 20 to charge the lithium battery pack 30; the lithium battery pack 30 includes a plurality of lithium batteries connected in series.
As shown in fig. 1, the lithium battery charging control system of the present embodiment includes a processor 10, a direct charging module 40, a single charging module 50, and a detection module 60; one path of the photovoltaic panel 20 is connected with the lithium battery pack 30 through the direct charging module 40, and the other path of the photovoltaic panel 20 is connected with the single charging module 50;
the detection module 60 is respectively connected with the processor 10 and the lithium battery pack 30, and is used for detecting state parameters of the lithium battery pack 30 in real time and feeding back to the processor 10, wherein the state parameters comprise voltages of the lithium batteries;
the processor 10 is respectively connected with the direct charging module 40 and the single charging module 50, and the processor 10 respectively sends corresponding signals to the direct charging module 40 and the single charging module 50 according to the state parameters fed back by the detection module 60;
the direct charging module 40 is turned on or turned off according to the signal output by the processor 10;
the single charging module 50 is respectively connected to each lithium battery of the lithium battery pack 30, and the single charging module 50 is used for respectively adjusting connection on-off states of each lithium battery according to signals output by the processor 10.
In the lithium battery charging control system of the embodiment, the single lithium battery in the lithium battery pack 30 is independently charged by adopting the single charging module 50, and the whole lithium battery pack 30 is charged by adopting the direct charging module 40; the state parameters of the lithium battery pack 30 are detected by the detection module 60 and fed back to the processor 10, and the processor 10 analyzes and confirms the corresponding charging mode according to the state parameters fed back by the detection module 60, and outputs corresponding signals to the single charging module 50 and the direct charging module 40 according to the charging mode, so that the lithium battery pack 30 is charged in the confirmed charging mode. The processor 10 may analyze the voltage difference value of the single lithium battery according to the voltage of each lithium battery fed back by the detection module 60, and determine the consistency of the series-connected batteries in the lithium battery pack 30 by comparing the voltage difference value with a preset threshold value, thereby selecting a corresponding charging mode and correspondingly outputting a corresponding control signal to the direct charging module 40 and the single charging module 50.
In this embodiment, the direct charging module 40 may preferably adopt a switching tube, for example, the direct charging module 40 includes two NMOS tubes, the processor 10 is respectively connected to the gates of the two NMOS tubes, the sources of the two NMOS tubes are connected, the drain of one NMOS tube is connected to the positive electrode of the photovoltaic panel 20, and the drain of the other NMOS tube is connected to the positive electrode of the lithium battery pack 30. In addition, the output of the single charging module 50 may be correspondingly connected to each lithium battery through a plurality of output lines, and each output line has a switching element for controlling on/off. Specifically, when the processor 10 selects the direct charging mode, the processor 10 outputs control signals corresponding to the direct charging mode to the direct charging module 40 and the single charging module 50 respectively, so that the direct charging module 40 is turned on, and the single charging module 50 is disconnected from each lithium battery of the lithium battery pack 30, so that the whole charging of the lithium battery pack 30 is realized; when the processor 10 selects the single charging mode, the processor 10 outputs control signals corresponding to the single charging mode to the direct charging module 40 and the single charging module 50 respectively, so that the direct charging module 40 is disconnected, and meanwhile, the single charging module 50 selects a corresponding output line to connect with a corresponding lithium battery, so as to realize independent charging of the connected lithium battery.
According to the technical scheme of the embodiment, the processor 10 judges the consistency of the series-connected lithium batteries in the lithium battery pack 30 according to the voltage of each lithium battery fed back by the detection module 60, so that the corresponding charging mode is selected to charge the lithium batteries, and when the consistency is not in accordance with the requirements, the pressure difference between the lithium batteries in the lithium battery pack 30 can be balanced through the independent charging mode, so that the consistency of the series-connected batteries in the lithium battery pack 30 is improved; when the consistency of the series batteries in the lithium battery pack 30 meets the requirement, controlling and switching to the whole charging of the lithium battery pack 30; in this way, the situation that the lithium battery is overcharged or overdischarged due to the fact that the voltage of the individual lithium battery in the lithium battery pack 30 is too high/too low is avoided, the safety management of the lithium battery in the lithium battery pack 30 is achieved, safety accidents caused by the overcharge/overdischarge are avoided, and the use safety of the lithium battery product is improved.
Referring to fig. 1, further, in this embodiment, the state parameter includes a temperature of the lithium battery pack 30 (typically, a surface temperature of the lithium battery pack 30), and the lithium battery charging control system further includes a heating module 70 connected to the processor 10, where the heating module 70 is configured to heat the lithium battery of the lithium battery pack 30; the processor 10 controls whether the heating module 70 operates according to the temperature of the lithium battery pack 30 fed back by the detecting module 60.
Since lithium battery products are used in cold winter or extremely cold regions, the lithium batteries in the lithium battery pack 30 often cannot be charged due to too low a temperature. In this embodiment, when the lithium battery charging control system is in operation, the detection module 60 also detects the temperature of the lithium battery pack 30 in real time and feeds back the temperature to the processor 10, in addition, the lithium battery charging control system of this embodiment further provides a heating module 70, and when the temperature of the lithium battery pack 30 is too low, the processor 10 controls the heating module 70 to operate so as to heat the lithium battery pack 30, so that the lithium battery product can be normally charged in a cold environment.
The invention also provides a working method of the lithium battery charging control system based on the embodiment.
As shown in fig. 2, fig. 2 is a flowchart illustrating a first embodiment of a method for operating a lithium battery charge control system according to the present invention; in this embodiment, the working method includes:
step S10, detecting state parameters of a lithium battery pack in real time, and calculating the extreme value of the voltage of a single lithium battery in the lithium battery pack, wherein the state parameters comprise the voltage of each lithium battery in the lithium battery pack;
the maximum difference value of the voltages of the single lithium batteries in the lithium battery pack is the maximum voltage difference value among the voltages of the lithium batteries, and the maximum difference value is used for reflecting the consistency condition among the lithium batteries connected in series in the lithium battery pack. After the lithium battery charging control system is started, state parameters of the lithium battery pack are detected in real time, the state parameters of the lithium battery pack comprise voltages of all lithium batteries in the lithium battery pack, and the extreme value of the voltage of a single lithium battery in the lithium battery pack is obtained by subtracting the lowest voltage from the highest voltage in the detected voltages of all lithium batteries.
Step S20 of analyzing whether the limit value is greater than a predetermined first threshold value (i.e., comparing the limit value with the predetermined first threshold value);
a first threshold value is preset in the lithium battery charging control system, the first threshold value is a reference value correspondingly set according to a requirement standard for consistency of lithium batteries connected in series in the lithium battery pack, and the first threshold value is used for calculating whether voltage distribution conditions in the lithium battery pack corresponding to the pole difference value accord with a specified consistency requirement or not; that is, the difference value is compared with a first threshold value to determine whether the difference value is within a predetermined range, thereby determining a charging mode.
Step S30, independently charging the lithium battery with the lowest voltage in the lithium battery pack when the maximum difference value is larger than the first threshold value;
when the limit value is larger than a first threshold value, the limit value exceeds a specified range, namely, the fact that the pressure difference between at least two lithium batteries in the lithium battery pack is overlarge is reflected, so that the consistency of the whole lithium battery pack is disqualified, and the lithium battery pack is not suitable for being charged in the whole lithium battery pack in the state; when the lithium battery pack is judged to be in the state, the lithium battery charging control system independently charges the lithium battery with the lowest voltage in the lithium battery pack (namely, other lithium batteries are not charged and are in a state of standing and waiting), so that the pressure difference between the lithium battery and the lithium battery with the highest voltage is balanced, and the battery consistency of the lithium battery pack is improved.
Step S40, when the voltage of the independently charged lithium battery reaches the voltage of the lithium battery with the highest voltage in the lithium battery pack, stopping independent charging and jumping to execute step S10;
when the voltage of the independently charged lithium battery reaches the voltage of the lithium battery with the highest voltage in the lithium battery pack, and when the voltage of the lithium battery reaches the voltage of the lithium battery with the highest voltage in the lithium battery pack, the voltage difference between the lithium battery and the lithium battery is zero, and the independent charging is stopped at the moment, but the lithium battery can not be directly converted into the whole lithium battery pack for charging, because the lithium battery with the excessively low voltage possibly exists in the lithium battery pack, the cyclic detection and the independent charging treatment are needed.
And S50, when the limit value is smaller than or equal to the first threshold value, the lithium battery pack is charged as a whole until the charging is completed.
When the limit value is smaller than or equal to the first threshold value, namely, the limit value is within the range of the first threshold value, the difference between lithium batteries in the lithium battery pack is small, the consistency is good, and at the moment, the difference between the lithium batteries is not needed to be balanced through independent charging, and the lithium battery charging control system controls the whole charging of the lithium battery pack; if the limit value of the single lithium battery voltage in the lithium battery pack, which is detected and calculated in real time by the lithium battery charging control system during the integral charging of the lithium battery pack, is always within a first threshold range, the lithium battery charging control system always keeps the integral charging of the lithium battery pack until the charging is completed; if the range of the single lithium battery voltage in the lithium battery pack detected and calculated by the lithium battery charging control system in real time exceeds the range of the first threshold value during the whole charging of the lithium battery pack, the lithium battery charging control system is switched to an independent charging mode to charge the lithium batteries in the lithium battery pack until the range of the single lithium battery voltage in the lithium battery pack obtained in real time returns to the range of the first threshold value, and the lithium battery charging control system is switched back to the whole charging mode; and the operation is circularly performed.
According to the technical scheme, by adopting real-time analysis of the extreme value of the voltage of a single lithium battery in the lithium battery pack, whether the consistency of the series lithium batteries in the lithium battery pack meets the requirement is determined, and under the condition that the consistency of the series lithium batteries in the lithium battery pack does not meet the requirement, the lithium batteries with the lowest voltage in the lithium battery pack are independently charged, so that the pressure difference among the lithium batteries in the lithium battery pack is balanced, the consistency of the series lithium batteries in the lithium battery pack is improved, and when the consistency of the series lithium batteries in the lithium battery pack meets the requirement, the control is switched to the integral charging of the lithium battery pack; therefore, the situation that the lithium battery is overcharged or overdischarged due to the fact that the voltage of the individual lithium battery in the lithium battery pack is too high/too low is avoided, the safety management of the lithium battery in the lithium battery pack is achieved, safety accidents caused by the overcharge/overdischarge are avoided, and the use safety of a lithium battery product is improved.
Further, step S30 in the present embodiment preferably includes:
when the polar difference value is larger than the first threshold value, acquiring the current voltage of each lithium battery;
during the whole charging period of the lithium battery pack, when the detected and calculated limit value exceeds the range of the first threshold value, the lithium battery charging control system controls to stop the whole charging of the lithium battery pack, and at the moment, the voltage of each lithium battery in the lithium battery pack has certain fluctuation, so that when the whole charging of the lithium battery pack is stopped, the current voltage of each lithium battery is obtained again, the accurate voltage of each lithium battery is obtained, and the differential pressure equalization in the independent charging stage is more accurate.
Independently charging the lithium battery corresponding to the obtained lowest voltage by adopting a constant voltage, wherein the size of the constant voltage is equal to that of the obtained highest voltage;
the lithium battery with the lowest voltage is independently charged in a constant voltage mode, and the constant voltage is equal to the acquired highest voltage, so that the voltage of the charged lithium battery can be accurately charged to be equal to the acquired highest voltage.
Step S40 in the present embodiment may preferably employ the following manner, including:
monitoring the voltage of the independently charged lithium battery in real time, and comparing the voltage of the independently charged lithium battery with the acquired highest voltage; when the voltage of the independently charged lithium battery is smaller than the acquired highest voltage, continuing charging;
and when the voltage of the independently charged lithium battery is greater than or equal to the acquired highest voltage, stopping the independent charging and jumping to execute the step S10.
As shown in fig. 3, fig. 3 is a flowchart illustrating a second embodiment of a method for operating a lithium battery charge control system according to the present invention; the present embodiment is based on the first embodiment, and in the present embodiment, between the step S10 and the step S20 of the working method, further includes:
step S101, analyzing whether the extremely-poor value is larger than a predetermined second threshold value (comparing the extremely-poor value with the predetermined second threshold value);
when the pressure difference between the lithium batteries in the lithium battery pack is very large, namely the extremely large difference value, the lithium batteries with low voltage in the lithium battery pack may have serious problems such as internal micro short circuit, external short circuit and the like, and the lithium battery pack is not suitable for continuous use at this time, and safety accidents easily occur if the lithium battery pack is used continuously. In order to avoid this, a second threshold is preset in the lithium battery charging control system; the second threshold is a reference value of a limit value for ensuring the normal of each lithium battery in the lithium battery pack, and when the calculated limit value is within the second threshold range, the normal of each lithium battery in the lithium battery pack is indicated; if the calculated range exceeds the second threshold range, abnormal lithium batteries may exist in the lithium battery pack.
When the polar difference is smaller than or equal to the second threshold value, executing step S20;
and when the limit value is within the range of the second threshold value, indicating that the pressure difference between the lithium batteries in the lithium battery pack is normal, and not that the lithium batteries are abnormal, the lithium battery charging control system continues to compare and analyze the limit value (comparing with the first threshold value) so as to determine the charging mode of the lithium battery pack.
And step S102, when the limit value is larger than the second threshold value, executing preset emergency operation.
When the limit value exceeds the range of the second threshold value, it is indicated that serious problems such as internal micro short circuit and external short circuit of the lithium battery are likely to occur in the lithium battery pack, and at the moment, the lithium battery pack cannot be continuously charged for use, and the lithium battery charging control system executes preset emergency operation. The emergency operation may be that the lithium battery charge control system stops working, generates a fault alarm or transmits a fault reminding message to a predetermined terminal, etc.
In the embodiment, before the charging operation, a second threshold is set to detect the extremely poor value detected and calculated in real time so as to detect whether a fault or abnormal lithium battery exists in the lithium battery pack; when all lithium batteries in the lithium battery pack are determined to be normal, continuing to execute subsequent charging operation; when the fault or abnormal lithium battery in the lithium battery pack is determined, the subsequent charging operation is not performed, the emergency operation is implemented, the use safety of the lithium battery pack is further ensured, and the occurrence of safety accidents is avoided.
As shown in fig. 4, fig. 4 is a flowchart illustrating a third embodiment of the operation method of the lithium battery charging control system according to the present invention.
The present embodiment is based on the second embodiment, and in the present embodiment, the working method replaces the step "when the maximum difference value is equal to or smaller than the second threshold value" in the second embodiment with the step S20 ":
step S201, when the limit value is smaller than or equal to the second threshold value, detecting the voltage of the photovoltaic panel, and analyzing whether the detected voltage of the photovoltaic panel is larger than a predetermined third threshold value (namely, comparing the detected voltage of the photovoltaic panel with the predetermined third threshold value);
the third threshold is a preset control voltage in the lithium battery charging control system, and is used for determining whether the voltage of the photovoltaic panel meets a threshold for charging the lithium battery pack. And when the range of the polar difference value is within the range of the second threshold value, indicating that the lithium batteries in the lithium battery pack are normal, further detecting the voltage of the photovoltaic panel, and comparing the voltage of the photovoltaic panel with the third threshold value to determine whether the current photovoltaic panel has the capability of charging the lithium battery pack.
And when the voltage of the photovoltaic panel is greater than or equal to the third threshold value, executing step S20.
When the voltage of the photovoltaic panel reaches a third threshold value, the voltage of the photovoltaic panel is provided with the capability of charging the lithium battery, and the lithium battery charging control system continues to compare and analyze the range value at the moment so as to determine the mode of charging the lithium battery pack.
When the voltage of the photovoltaic panel is smaller than the third threshold value, the voltage of the photovoltaic panel is not provided with the capability of charging the lithium battery pack, and the subsequent charging operation is not performed; in addition, the state also reflects the condition that the energy conversion amount of the photovoltaic panel is low, and the situation is likely to be rainy days or nights, and the like, and the lithium battery charging control system can control the lithium battery pack to perform a discharging mode at the moment so as to supply power to a load (such as a street lamp); of course, if the state of the lithium battery pack does not support discharge, the lithium battery charge control system does not perform discharge operation.
Referring to fig. 5, fig. 5 is a flowchart illustrating a fourth embodiment of an operation method of the lithium battery charge control system according to the present invention. The present embodiment is based on the third embodiment, in the present embodiment, the state parameter further includes a temperature of the lithium battery pack (typically, a surface temperature of the lithium battery pack), and the working method of the present embodiment replaces the step "when the voltage of the photovoltaic panel is greater than or equal to the third threshold, with the step S20" that is executed:
step S301 of analyzing whether the detected temperature of the lithium battery pack is greater than a predetermined temperature threshold (i.e., comparing the detected temperature of the lithium battery pack with the predetermined temperature threshold) when the voltage of the photovoltaic panel is greater than or equal to the third threshold;
when the lithium battery product is used in cold winter or extremely cold areas, the lithium batteries in the lithium battery pack often cannot be charged due to too low temperature; therefore, the lithium battery charging control system of the embodiment increases the analysis of the temperature of the lithium battery pack before the charging operation to determine whether the lithium battery pack can be charged; specifically, a temperature threshold (e.g., 0 ℃, -2 ℃ and the like) is preset in the lithium battery charging control system, and whether the lithium battery can be charged or not can be determined by comparing the detected temperature of the lithium battery pack with the temperature threshold.
Executing step S20 when the temperature of the lithium battery pack is greater than the temperature threshold;
when the temperature of the lithium battery pack is greater than the temperature threshold, the lithium battery pack is not reduced to a temperature state in which the lithium battery pack cannot be charged, and the lithium battery charging control system continues to execute subsequent charging operation.
And step S302, when the temperature of the lithium battery pack is less than or equal to the temperature threshold value, heating the lithium battery pack.
When the temperature of the lithium battery is lower than the temperature threshold value, the temperature of the lithium battery pack is too low, and the lithium battery pack does not support charging temporarily; and the lithium battery charging control system controls the heating part to heat the lithium battery pack at the moment until the temperature of the lithium battery pack is higher than the temperature threshold value, and stops heating.
According to the embodiment, the temperature of the lithium battery is detected and correspondingly processed before the charging operation, so that the subsequent charging operation failure caused by the fact that the temperature of the lithium battery pack is too low is avoided, and the effectiveness of charging the lithium battery pack is ensured.
Referring to fig. 6, fig. 6 is a flowchart illustrating a fifth embodiment of a method for operating a lithium battery charge control system according to the present invention. The present embodiment is based on the first embodiment, in this embodiment, between the step S10 and the step S20, the working method further includes:
step S401, detecting the voltage of the photovoltaic panel, analyzing whether the detected voltage of the photovoltaic panel is larger than a predetermined third threshold value (namely, comparing the detected voltage of the photovoltaic panel with the predetermined third threshold value);
the third threshold is a preset control voltage in the lithium battery charging control system, and is used for determining whether the voltage of the photovoltaic panel meets a threshold for charging the lithium battery pack. And before the subsequent charge mode analysis processing is performed, comparing the voltage of the photovoltaic panel with the third threshold value to determine whether the current photovoltaic panel has the capability of charging the lithium battery pack.
And when the voltage of the photovoltaic panel is greater than or equal to the third threshold value, executing step S20.
When the voltage of the photovoltaic panel reaches a third threshold value, the voltage of the photovoltaic panel is provided with the capability of charging the lithium battery, and the lithium battery charging control system continues to compare and analyze the range value at the moment so as to determine the mode of charging the lithium battery pack.
When the voltage of the photovoltaic panel is smaller than the third threshold value, the voltage of the photovoltaic panel is not provided with the capability of charging the lithium battery pack, and the subsequent charging operation is not performed; in addition, the state also reflects the condition that the energy conversion amount of the photovoltaic panel is low, and the situation is likely to be rainy days or nights, and the like, and the lithium battery charging control system can control the lithium battery pack to perform a discharging mode at the moment so as to supply power to a load (such as a street lamp); of course, if the state of the lithium battery pack does not support discharge, the lithium battery charge control system does not perform discharge operation.
Referring to fig. 7, fig. 7 is a flowchart illustrating a sixth embodiment of a method for operating a lithium battery charge control system according to the present invention. The present embodiment is based on the first embodiment, in this embodiment, the state parameter further includes a temperature of the lithium battery pack, and the working method further includes, between the step S10 and the step S20:
step S501, analyzing whether the detected temperature of the lithium battery pack is greater than a predetermined temperature threshold (i.e., comparing the detected temperature with the predetermined temperature threshold);
when the lithium battery product is used in cold winter or extremely cold areas, the lithium batteries in the lithium battery pack often cannot be charged due to too low temperature; therefore, the lithium battery charging control system of the embodiment increases the analysis of the temperature of the lithium battery pack before the charging operation to determine whether the lithium battery pack can be charged; specifically, a temperature threshold (e.g., 0 ℃, -2 ℃ and the like) is preset in the lithium battery charging control system, and whether the lithium battery can be charged or not can be determined by comparing the detected temperature of the lithium battery pack with the temperature threshold.
Executing step S20 when the temperature of the lithium battery pack is greater than the temperature threshold;
when the temperature of the lithium battery pack is greater than the temperature threshold, the lithium battery pack is not reduced to a temperature state in which the lithium battery pack cannot be charged, and the lithium battery charging control system continues to execute subsequent charging operation.
And step S502, when the temperature of the lithium battery pack is less than or equal to the temperature threshold value, heating the lithium battery pack.
When the temperature of the lithium battery is lower than the temperature threshold value, the temperature of the lithium battery pack is too low, and the lithium battery pack does not support charging temporarily; and the lithium battery charging control system controls the heating part to heat the lithium battery pack at the moment until the temperature of the lithium battery pack is higher than the temperature threshold value, and stops heating.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The lithium battery charging control system is connected with the photovoltaic panel and the lithium battery pack and is characterized by comprising a processor, a direct charging module, a single charging module and a detection module;
one path of the photovoltaic panel is connected with the lithium battery pack through the direct charging module, and the other path of the photovoltaic panel is connected with the single charging module;
the detection module is respectively connected with the processor and the lithium battery pack, and is used for detecting state parameters of the lithium battery pack in real time and feeding back the state parameters to the processor, wherein the state parameters comprise voltages of all lithium batteries;
the processor is respectively connected with the direct charging module and the single charging module, and respectively sends corresponding signals to the direct charging module and the single charging module according to the state parameters fed back by the detection module;
the direct charging module is conducted or disconnected according to signals output by the processor;
the single charging module is respectively connected with each lithium battery of the lithium battery pack, and the single charging module respectively adjusts the connection on-off state of each lithium battery according to the signals output by the processor;
the lithium battery charging control system performs the steps of:
A. detecting state parameters of a lithium battery pack in real time, and calculating the extreme difference value of the voltage of a single lithium battery in the lithium battery pack, wherein the state parameters comprise the voltage of each lithium battery in the lithium battery pack;
B. comparing the difference value with a first predetermined threshold value to judge the consistency of the lithium batteries connected in series in the lithium battery pack;
C. when the limit value is larger than the first threshold value, judging that the consistency of the lithium batteries connected in series in the lithium battery pack is not in accordance with the requirement, and independently charging the lithium battery with the lowest voltage in the lithium battery pack;
D. when the voltage of the independently charged lithium battery reaches the voltage of the lithium battery with the highest voltage in the lithium battery pack, stopping independent charging and jumping to execute the step A;
E. and when the limit value is smaller than or equal to the first threshold value, judging that the consistency of the serial lithium batteries in the lithium battery pack meets the requirement, and integrally charging the lithium battery pack until the charging is completed.
2. The lithium battery charge control system of claim 1, wherein the status parameter comprises a temperature of the lithium battery pack, the lithium battery charge control system further comprising a heating module coupled to the processor, the heating module configured to heat a lithium battery of the lithium battery pack; and the processor controls whether the heating module works or not according to the temperature of the lithium battery pack fed back by the detection module.
3. The working method of the lithium battery charging control system is characterized in that the lithium battery charging control system is connected with a photovoltaic panel and a lithium battery pack, and comprises a processor, a direct charging module, a single charging module and a detection module; one path of the photovoltaic panel is connected with the lithium battery pack through the direct charging module, and the other path of the photovoltaic panel is connected with the single charging module; the detection module is respectively connected with the processor and the lithium battery pack; the processor is respectively connected with the direct charging module and the single charging module; the direct charging module is conducted or disconnected according to signals output by the processor; the single charging module is respectively connected with each lithium battery of the lithium battery pack; the working method comprises the following steps:
A. detecting state parameters of a lithium battery pack in real time, and calculating the extreme difference value of the voltage of a single lithium battery in the lithium battery pack, wherein the state parameters comprise the voltage of each lithium battery in the lithium battery pack;
B. comparing the difference value with a first predetermined threshold value to judge the consistency of the lithium batteries connected in series in the lithium battery pack;
C. when the limit value is larger than the first threshold value, judging that the consistency of the lithium batteries connected in series in the lithium battery pack is not in accordance with the requirement, and independently charging the lithium battery with the lowest voltage in the lithium battery pack;
D. when the voltage of the independently charged lithium battery reaches the voltage of the lithium battery with the highest voltage in the lithium battery pack, stopping independent charging and jumping to execute the step A;
E. and when the limit value is smaller than or equal to the first threshold value, judging that the consistency of the serial lithium batteries in the lithium battery pack meets the requirement, and integrally charging the lithium battery pack until the charging is completed.
4. The method of claim 3, wherein between step a and step B further comprises:
comparing the difference value with a predetermined second threshold;
b, executing the step B when the limit value is smaller than or equal to the second threshold value;
and executing preset emergency operation when the limit value is larger than the second threshold value.
5. The method of claim 4, wherein the step B is replaced by:
detecting the voltage of the photovoltaic panel when the polar difference value is smaller than or equal to the second threshold value, and comparing the detected voltage of the photovoltaic panel with a predetermined third threshold value;
and B, executing the step when the voltage of the photovoltaic panel is larger than or equal to the third threshold value.
6. The method according to claim 5, wherein the state parameter further includes a temperature of the lithium battery pack, and the step B is replaced by:
comparing the detected temperature of the lithium battery pack with a predetermined temperature threshold when the voltage of the photovoltaic panel is greater than or equal to the third threshold;
b, executing the step when the temperature of the lithium battery pack is greater than the temperature threshold;
and when the temperature of the lithium battery pack is less than or equal to the temperature threshold value, heating the lithium battery pack.
7. The method of claim 3, wherein between step a and step B further comprises:
detecting a voltage of the photovoltaic panel and comparing the detected voltage of the photovoltaic panel with a predetermined third threshold;
and B, executing the step when the voltage of the photovoltaic panel is larger than or equal to the third threshold value.
8. The method of operating a lithium battery charge control system according to any one of claims 5 to 7, further comprising:
and controlling the lithium battery pack to discharge when the voltage of the photovoltaic panel is smaller than the third threshold value.
9. The method of claim 3, wherein the state parameter further comprises a temperature of the lithium battery pack, and the steps a and B further comprise:
comparing the detected temperature of the lithium battery pack with a predetermined temperature threshold;
b, executing the step when the temperature of the lithium battery pack is greater than the temperature threshold;
and when the temperature of the lithium battery pack is less than or equal to the temperature threshold value, heating the lithium battery pack.
10. The method of claim 3, wherein step C comprises:
when the polar difference value is larger than the first threshold value, acquiring the current voltage of each lithium battery;
independently charging the lithium battery corresponding to the obtained lowest voltage by adopting a constant voltage, wherein the size of the constant voltage is equal to that of the obtained highest voltage;
the step D comprises the following steps:
monitoring the voltage of the independently charged lithium battery in real time, and comparing the voltage of the independently charged lithium battery with the acquired highest voltage;
and (C) when the voltage of the independently charged lithium battery is greater than or equal to the acquired highest voltage, stopping the independent charging and jumping to execute the step (A).
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| CN108196204A (en) * | 2018-03-08 | 2018-06-22 | 珠海格力电器股份有限公司 | Method and testing device for rapidly detecting self-discharge consistency of lithium ion battery |
| CN111355294A (en) * | 2020-02-26 | 2020-06-30 | 成都星时代宇航科技有限公司 | Micro-nano satellite power supply control method |
| CN116331039B (en) * | 2023-02-24 | 2023-11-10 | 北京质云数据科技有限公司 | Management system based on parking area energy storage type solar charging equipment |
| CN117497918B (en) * | 2023-12-29 | 2024-03-22 | 惠州市汇恒自动化科技有限公司 | Battery formation temperature control method, battery formation method and battery formation device |
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