CN113300431B - Charging method of lithium battery pack and related components thereof - Google Patents
Charging method of lithium battery pack and related components thereof Download PDFInfo
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- CN113300431B CN113300431B CN202110599285.5A CN202110599285A CN113300431B CN 113300431 B CN113300431 B CN 113300431B CN 202110599285 A CN202110599285 A CN 202110599285A CN 113300431 B CN113300431 B CN 113300431B
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- voltage
- battery pack
- lithium battery
- charger
- conversion circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
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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
- H01M10/446—Initial charging measures
-
- 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
-
- 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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- 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
Abstract
The application discloses a charging method of a lithium battery pack and related components thereof, wherein in the scheme, when the current voltage of the lithium battery pack is smaller than a preset safety voltage, a voltage conversion circuit is controlled to feed back a first preset voltage after the current voltage of the lithium battery pack is boosted to a power output end of a charger so as to increase the voltage of the power output end of the charger, thereby reducing the charging current of the charger. Therefore, the voltage conversion circuit only boosts the voltage of the lithium battery pack without professional technicians or dismantling the protection device, so that the charger charges the lithium battery pack with the first charging current with a smaller current value corresponding to the boosted first preset voltage, normal operation of the lithium battery pack can be ensured, the safety is high, and the cost is lower.
Description
Technical Field
The present application relates to the field of battery management, and in particular, to a charging method for a lithium battery pack and related components thereof.
Background
When a standby lithium ion battery pack, which is currently used in a large amount in the fields of mobile communication base stations, light electric vehicles, and the like, is stored for a long period of time, an overdischarge problem often occurs due to long-term dormancy of a BMS (Battery Management System ). Specifically, the long-term lithium ion battery pack stored in the battery pack is in a low-power-consumption dormant state, and the matched BMS is in a low-power-consumption dormant state, however, when the lithium ion battery pack is stored for a long time, if the lithium ion battery pack cannot be timely charged, the residual electric quantity of the lithium ion battery pack can be continuously consumed by the BMS in the low-power-consumption dormant state, and although the discharging current of the discharging mode is very small, the discharging current at the moment is uncontrolled, the lithium ion battery pack continuously supplies power to the BMS in all weather, a protection circuit inside the BMS has no protection effect on the discharging mode, the electric quantity of the lithium ion battery pack can be completely discharged, so that the voltage of a single battery in the lithium ion battery pack is lower than a safety lower limit, and even the voltage of the single battery pack can be reduced to 0. When the voltage of the single battery drops below the safety lower limit and the lithium ion battery pack is used again, the single battery needs to be charged first, but because lithium atoms on the cathode of the battery are largely separated from carbon materials of the cathode, the carbon layer of the cathode is very fragile, and at the moment, if a charger is used for charging the lithium battery pack according to a mode of charging a normal battery, the larger charging current can cause the collapse of the carbon layer of the cathode, so that a large amount of lithium atoms are accumulated on a diaphragm, thereby causing lithium dendrite short circuit, and further possibly causing safety accidents such as battery gassing, bulging and even explosion in the lithium ion battery pack. Therefore, when the voltage of the single battery in the lithium ion battery pack is lower than the safety lower limit, the common BMS does not allow the charger to charge the single battery, i.e., the battery is in a low-voltage charging protection state, so as to avoid causing safety problems. If so, the lithium ion battery pack with the voltage of the single battery falling below the safety lower limit can only be scrapped, which definitely causes the waste of resources and the loss of property.
However, it has been proved that if the BMS of the lithium battery pack is removed when the lithium battery pack is in a low-voltage charge protection state, i.e., the voltage of the unit battery of the lithium battery pack is less than the safety lower limit, and the lithium battery pack is maintainably charged with a low current (e.g., a current of 0.01C or less) using a dc power supply having a low current output function, the risk of lithium dendrite generation in the lithium battery pack, i.e., the occurrence probability of safety accidents, can be reduced. And after the voltage of each single battery in the lithium battery pack is charged to be greater than the voltage of the safety lower limit, installing the BMS of the lithium battery pack to the lithium battery pack, and continuously charging the lithium battery pack by using a charger according to a normal charging mode until the lithium battery pack is charged to be over-charged for protection. The method can repair the overdischarged lithium battery pack, so that the lithium battery pack can work normally, the lithium battery pack is put into use again, the scrapping of the lithium battery pack is avoided, the value of the lithium battery pack is fully utilized, however, the BMS of the lithium battery pack is dismantled and charged with small current, and then the BMS is not feasible to be reinstalled. Firstly, the operation process of removing the BMS and then installing is strong in professional, and a common lithium battery pack user rarely has the technical knowledge of the professional, and if the operation is improper, the lithium battery pack can be damaged, the BMS can be damaged, and further safety accidents can occur, so that only an engineer who receives professional training can use equipment provided with professional maintenance equipment. This makes such maintenance operations available to a small number of professionals, who cannot make such attempts; secondly, many occasions are limited by conditions, and even a professional technician can not detach the battery pack or have no proper charging condition, so that the maintenance mode is further limited; again, even if the conditions for charging are provided and the maintenance facilities are complete, charging with a small current is a very long process, and after the BMS is removed, due to lack of monitoring parameters necessary for the lithium battery pack, once the problems of overcharge, over-temperature and the like occur, the lithium ion battery may have safety problems such as leakage, gas expansion and even fire explosion, so that the charging mode has a large uncertainty and causes higher maintenance cost.
In summary, the long-term storage of the lithium battery pack often cannot be normally charged due to overdischarge, and the removal of the protection device for low-current charging must be performed by a professional technician using professional equipment and facilities, and the safety problem in the actual charging process is relatively large, and the cost is relatively high, so that the problem of how to efficiently, conveniently and safely charge the long-term storage of the overdischarged lithium battery pack is a problem to be solved in the present day.
Disclosure of Invention
The application aims to provide a charging method of a lithium battery pack and related components thereof, which do not need professional technicians, do not need to remove a protection device, only boost the voltage of the lithium battery pack by a voltage conversion circuit, enable a charger to charge the lithium battery pack by a first charging current with a smaller current value corresponding to a boosted first preset voltage, and can ensure normal operation of the lithium battery pack, and the method is high in safety and low in cost.
In order to solve the technical problems, the application provides a charging method of a lithium battery pack, which is applied to a processor in a charging device, wherein the charging device further comprises a charger, a control switch, a voltage acquisition module and a voltage conversion circuit; the control switch comprises a control switch, a voltage conversion circuit, a lithium battery pack, a voltage conversion circuit, a first voltage conversion circuit, a second voltage conversion circuit and a power supply output end, wherein the movable end of the control switch is connected with the power supply output end of the charger, the first fixed end is connected with the lithium battery pack, and the second fixed end is connected with the second end of the voltage conversion circuit; the input end of the voltage acquisition module is connected with the lithium battery pack, and the output end of the voltage acquisition module is connected with the input end of the processor; the first end of the voltage conversion circuit is connected with the lithium battery pack; the first control end of the processor is connected with the control end of the voltage conversion circuit, and the second control end of the processor is connected with the control end of the control switch;
the method comprises the following steps:
judging whether the current voltage of the lithium battery pack acquired by the voltage acquisition module is smaller than a preset safety voltage or not;
if yes, the movable end of the control switch is controlled to be connected with the second fixed end, so that the voltage conversion circuit feeds back a first preset voltage after boosting the current voltage of the lithium battery pack to the power output end of the charger, and the charger charges the lithium battery pack with a first charging current; the charging current output by the charger is inversely related to the voltage of the power supply output end of the charger.
Preferably, after determining whether the current voltage of the lithium battery pack acquired by the voltage acquisition module is less than a preset safety voltage, the method further includes:
if not, the movable end of the control switch is controlled to be connected with the first fixed end, so that the charger charges the lithium battery pack with a second charging current corresponding to the current voltage of the lithium battery pack; the second charging current is greater than the first charging current.
Preferably, after determining whether the current voltage of the lithium battery pack acquired by the voltage acquisition module is less than a preset safety voltage, the method further includes:
if not, the movable end of the control switch is controlled to be connected with the second fixed end, and the voltage conversion circuit feeds back a second preset voltage after the voltage conversion of the current voltage of the lithium battery pack to the power output end of the charger, so that the charger charges the lithium battery pack with a third charging current; the third charging current is greater than the first charging current.
Preferably, the lithium battery pack includes a plurality of lithium battery cells;
the control switch is controlled to connect the movable end and the second fixed end, so that the voltage conversion circuit feeds back a first preset voltage after boosting the current voltage of the lithium battery pack to the power output end of the charger, and the charger charges the lithium battery pack with a first charging current, and then the control switch further comprises:
judging whether the current voltage of each lithium battery cell in the lithium battery pack acquired by the voltage acquisition module is not less than the preset safety voltage;
if yes, the movable end of the control switch is controlled to be connected with the first fixed end, so that the charger charges the lithium battery pack with a fourth charging current corresponding to the current voltage of the lithium battery pack; the fourth charging current is greater than the first charging current.
Preferably, the voltage conversion circuit is a direct current/DC conversion circuit.
Preferably, the processor is connected with the lithium battery pack, and the method further comprises:
judging whether the battery parameters of the lithium battery pack do not meet the conditions of preset normal parameters;
if yes, the movable end of the control switch is controlled to hang in the air, so that the charger stops charging the lithium battery pack.
In order to solve the technical problems, the application provides a charging system of a lithium battery pack, which is applied to a processor in a charging device, wherein the charging device further comprises a charger, a control switch, a voltage acquisition module and a voltage conversion circuit; the control switch comprises a control switch, a voltage conversion circuit, a lithium battery pack, a voltage conversion circuit, a first voltage conversion circuit, a second voltage conversion circuit and a power supply output end, wherein the movable end of the control switch is connected with the power supply output end of the charger, the first fixed end is connected with the lithium battery pack, and the second fixed end is connected with the second end of the voltage conversion circuit; the input end of the voltage acquisition module is connected with the lithium battery pack, and the output end of the voltage acquisition module is connected with the input end of the processor; the first end of the voltage conversion circuit is connected with the lithium battery pack; the first control end of the processor is connected with the control end of the voltage conversion circuit, and the second control end of the processor is connected with the control end of the control switch;
the system comprises:
the judging unit is used for judging whether the current voltage of the lithium battery pack acquired by the voltage acquisition module is smaller than a preset safety voltage or not;
the control unit is used for controlling the movable end of the control switch to be connected with the second fixed end when the current voltage of the lithium battery pack acquired by the voltage acquisition module is smaller than a preset safety voltage, so that the voltage conversion circuit feeds back a first preset voltage after boosting the current voltage of the lithium battery pack to the power output end of the charger, and the charger charges the lithium battery pack with a first charging current; the charging current output by the charger is inversely related to the voltage of the power supply output end of the charger.
In order to solve the above technical problems, the present application provides a charging device for a lithium battery pack, including:
a memory for storing a computer program;
and a processor for implementing the steps of the method for charging a lithium battery pack as described above when executing the computer program.
Preferably, the device also comprises a charger, a control switch, a voltage acquisition module and a voltage conversion circuit; the control switch comprises a control switch, a voltage conversion circuit, a lithium battery pack, a voltage conversion circuit, a first voltage conversion circuit, a second voltage conversion circuit and a power supply output end, wherein the movable end of the control switch is connected with the power supply output end of the charger, the first fixed end is connected with the lithium battery pack, and the second fixed end is connected with the second end of the voltage conversion circuit; the input end of the voltage acquisition module is connected with the lithium battery pack, and the output end of the voltage acquisition module is connected with the input end of the processor; the first end of the voltage conversion circuit is connected with the lithium battery pack; the first control end of the processor is connected with the control end of the voltage conversion circuit, and the second control end of the processor is connected with the control end of the control switch;
the voltage acquisition module is used for acquiring the current voltage of the lithium battery pack;
the voltage conversion circuit is used for performing voltage conversion on the current voltage of the lithium battery pack and feeding back the voltage after voltage conversion to the power output end of the charger;
the charger is used for outputting charging current which is inversely related to the voltage of the power supply output end of the charger so as to charge the lithium battery pack;
the control switch is used for connecting the power output end of the charger with the lithium battery pack when the moving end of the control switch is connected with the first fixed end, so that the voltage of the power output end of the charger is the current voltage of the lithium battery pack; and when the moving end of the charger is connected with the second fixed end, the power output end of the charger is connected with the voltage conversion circuit, so that the voltage of the power output end of the charger is the voltage obtained after the voltage conversion circuit performs voltage conversion on the current voltage of the lithium battery pack.
To solve the above technical problem, the present application provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the charging method of a lithium battery pack as described above.
The application provides a charging method of a lithium battery pack and related components thereof, wherein when the current voltage of the lithium battery pack is smaller than a preset safety voltage, a voltage conversion circuit is controlled to feed back a first preset voltage after the current voltage of the lithium battery pack is boosted to a power output end of a charger so as to increase the voltage of the power output end of the charger, thereby reducing the charging current of the charger. Therefore, the voltage conversion circuit only boosts the voltage of the lithium battery pack without professional technicians or dismantling the protection device, so that the charger charges the lithium battery pack with the first charging current with a smaller current value corresponding to the boosted first preset voltage, normal operation of the lithium battery pack can be ensured, the safety is high, and the cost is lower.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a charging method of a lithium battery pack according to the present application;
fig. 2 is a schematic structural diagram of a charging system of a lithium battery pack according to the present application;
fig. 3 is a schematic structural diagram of a charging device of a lithium battery pack according to the present application;
fig. 4 is a schematic structural diagram of a charging device for a lithium battery pack according to the present application.
Detailed Description
The core of the application is to provide a charging method of a lithium battery pack and related components thereof, no professional technician is needed, no protection device is needed to be removed, only the voltage conversion circuit boosts the voltage of the lithium battery pack, so that the charger charges the lithium battery pack with a first charging current with a smaller current value corresponding to a boosted first preset voltage, normal operation of the lithium battery pack can be ensured, the safety is high, and the cost is lower.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a schematic flow chart of a charging method of a lithium battery pack according to the present application, wherein the method is applied to a processor 32 in a charging device, and the charging device further comprises a charger 41, a control switch K, a voltage acquisition module 42 and a voltage conversion circuit 43; wherein, the moving end of the control switch K is connected with the power output end of the charger 41, the first moving end is connected with the lithium battery pack, and the second moving end is connected with the second end of the voltage conversion circuit 43; the input end of the voltage acquisition module 42 is connected with the lithium battery pack, and the output end is connected with the input end of the processor 32; a first end of the voltage conversion circuit 43 is connected to the lithium battery pack; the first control end of the processor 32 is connected with the control end of the voltage conversion circuit 43, and the second control end is connected with the control end of the control switch K;
the method comprises the following steps:
s11: judging whether the current voltage of the lithium battery pack acquired by the voltage acquisition module 42 is smaller than a preset safety voltage;
the charger 41 is a constant voltage source charger 41 that can output different charging currents according to a change in a voltage difference between a voltage at its power supply output terminal and a voltage inside itself. For example, the voltage inside the charger 41 is a preset constant voltage, and the power output end of the charger 41 is connected with the lithium battery pack, so that the voltage of the power output end of the charger 41 is the voltage of the lithium battery pack, and if the voltage of the lithium battery pack is larger, that is, the voltage difference between the voltage of the lithium battery pack and the preset constant voltage of the charger 41 is smaller, the charger 41 determines that the voltage of the lithium battery pack is higher, that is, the electric quantity of the lithium battery pack is more, the charging current output by the charger 41 is also reduced; if the voltage of the lithium battery pack is smaller, that is, the voltage difference between the voltage of the lithium battery pack and the preset constant voltage of the charger 41 is larger, the charger 41 determines that the voltage of the lithium battery pack is lower, that is, the electric quantity of the lithium battery pack is smaller, and then the charging current output by the charger 41 is also increased. It should be noted that, the charger 41 charges the lithium battery pack when the voltage of the lithium battery pack is less than the preset constant voltage, and stops charging the lithium battery pack when the voltage of the lithium battery pack is not less than the preset constant voltage, that is, stops outputting the charging current.
In the present application, the applicant considers that when the current voltage of the lithium battery pack is smaller than the preset safety voltage, the voltage difference between the voltage of the power output end of the charger 41 and the preset constant voltage is larger, if the charger 41 is enabled to charge the lithium battery pack directly according to the current voltage of the lithium battery pack, the charging current output by the charger 41 is larger, which can cause the failure and damage of the lithium battery pack, therefore, the charging current output by the charger 41 needs to be reduced, so that the normal use of the lithium battery pack is ensured.
S12: if yes, the movable end of the control switch K is controlled to be connected with the second stationary end, so that the voltage conversion circuit 43 feeds back a first preset voltage after boosting the current voltage of the lithium battery pack to the power output end of the charger 41, and the charger 41 charges the lithium battery pack with a first charging current; the charging current output by the charger 41 and the voltage at the power supply output terminal thereof are inversely related.
In order to solve the above technical problem, in the present application, a voltage conversion circuit 43 is further provided between the power output end of the charger 41 and the lithium battery pack, when the processor 32 determines that the current voltage of the lithium battery pack is smaller than the safety preset voltage, the moving end of the control switch K is connected to the second stationary end, that is, even if the second end of the voltage conversion circuit 43 is connected to the power output end of the charger 41, the processor 32 controls the voltage conversion circuit 43 to boost the current voltage of the lithium battery pack, and feeds the boosted first preset voltage back to the power output end of the charger 41, so as to reduce the voltage difference between the power output end of the charger 41 and the preset constant voltage, that is, even if the charger 41 determines that the voltage of the lithium battery pack is higher, that is, the electric quantity of the lithium battery pack is more, so that the first charging current with a smaller output current value of the charger 41 charges the lithium battery pack, and the charged lithium battery pack can still work normally.
For example, the processor 32 in the present application may control the voltage conversion circuit 43 to convert the current voltage of the lithium battery pack, and then make the current value of the charging current output by the charger 41 be 0.01C, which is not limited in this application, as long as it can ensure that the charging current output by the charger 41 does not damage the lithium battery pack.
Since the voltage conversion circuit 43 is connected in series between the charger 41 and the lithium battery pack after the second ends of the charger 41 and the voltage conversion circuit 43 are connected, the charging current output by the charger 41 is input into the lithium battery pack through the voltage conversion circuit 43, thereby realizing charging of the lithium battery pack.
In summary, the present application does not require a professional technician or dismantling a protection device, and only the voltage conversion circuit 43 boosts the voltage of the lithium battery pack, so that the charger 41 charges the lithium battery pack with the first charging current having the smaller current value corresponding to the boosted first preset voltage, thereby ensuring normal operation of the lithium battery pack, and having high safety and lower cost.
Based on the above embodiments:
as a preferred embodiment, after determining whether the current voltage of the lithium battery pack collected by the voltage collection module 42 is less than the preset safety voltage, the method further includes:
if not, the movable end of the control switch K is controlled to be connected with the first fixed end, so that the charger 41 charges the lithium battery pack with a second charging current corresponding to the current voltage of the lithium battery pack; the second charging current is greater than the first charging current.
Of course, if the current voltage of the lithium battery pack is not less than the preset safe voltage, that is, the lithium battery pack is not in the low-voltage protection state, the processor 32 may control the movable end of the control switch K to be connected with the first stationary end, that is, even if the power output end of the charger 41 is directly connected with the lithium battery pack, the processor 32 may directly output the corresponding charging current according to the current voltage of the lithium battery pack, so as to normally charge the lithium battery pack, and since the second charging current is greater than the first charging current, it can be seen that the charging efficiency can be improved.
As a preferred embodiment, after determining whether the current voltage of the lithium battery pack collected by the voltage collection module 42 is less than the preset safety voltage, the method further includes:
if not, the movable end of the control switch K is controlled to be connected with the second fixed end, and the voltage conversion circuit 43 feeds back a second preset voltage after the voltage conversion of the current voltage of the lithium battery pack to the power output end of the charger 41, so that the charger 41 charges the lithium battery pack with a third charging current; the third charging current is greater than the first charging current.
Of course, if the current voltage of the lithium battery pack is not less than the preset safety voltage, that is, the lithium battery pack is not in the low-voltage protection state, the processor 32 may control the movable end of the control switch K to be connected with the second fixed end, so as to feed back the second preset voltage after the voltage conversion of the current voltage of the lithium battery pack to the power output end of the charger 41, so that the charger 41 outputs a third charging current corresponding to the second preset voltage, so as to normally charge the lithium battery pack, and since the third charging current is greater than the first charging current, the charging efficiency is improved. And in this way the charger 41 can be made to charge the lithium battery pack with a constant charging current.
As a preferred embodiment, the lithium battery pack includes a plurality of lithium battery cells;
the control switch K has a movable end connected to the second stationary end, so that the voltage conversion circuit 43 feeds back a first preset voltage after boosting the current voltage of the lithium battery pack to the power output end of the charger 41, so that after the charger 41 charges the lithium battery pack with the first charging current, the control switch further includes:
judging whether the current voltage of each lithium battery cell in the lithium battery pack acquired by the voltage acquisition module 42 is not less than a preset safety voltage;
if yes, the movable end of the control switch K is controlled to be connected with the first fixed end, so that the charger 41 charges the lithium battery pack with a fourth charging current corresponding to the current voltage of the lithium battery pack; the fourth charging current is greater than the first charging current.
Because a plurality of lithium battery monomers are arranged in the lithium battery pack, when the current voltage of each lithium battery monomer is not less than the preset safety voltage, the power output end of the charger 41 is directly connected with the lithium battery pack, the processor 32 can directly output corresponding charging current according to the current voltage of the lithium battery pack so as to normally charge the lithium battery pack, and the fourth charging current is greater than the first charging current, so that the normal work of each battery in the lithium battery pack after charging can be ensured, and the charging efficiency can be improved.
As a preferred embodiment, the voltage conversion circuit 43 is a DC/DC (Direct current/Direct current) conversion circuit.
The voltage conversion circuit 43 in the present embodiment is a DC/DC conversion circuit, and can convert the present voltage of the lithium battery pack, so that the charger 41 outputs a charging current corresponding to the converted voltage.
As a preferred embodiment, the processor 32 is connected to a lithium battery pack, the method further comprising:
judging whether the battery parameters of the lithium battery pack do not meet the conditions of preset normal parameters;
if so, the movable end of the control switch K is controlled to suspend so that the charger 41 stops charging the lithium battery pack.
In order to ensure the normal operation of the lithium battery pack in the present embodiment, if it is detected that the battery parameter of the lithium battery pack does not meet the condition of the preset normal parameter, for example, the temperature of the lithium battery pack exceeds the preset temperature threshold, or the current voltage of the lithium battery pack is greater than the preset safety voltage upper limit, the charger 41 is controlled to stop charging the lithium battery pack, so as to avoid the occurrence of a larger fault of the lithium battery pack, or to influence the safety of the user.
The voltage conversion circuit 43 may be provided with a switching tube, an inductor and a capacitor, so as to convert the current voltage of the lithium battery pack.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a charging system of a lithium battery pack according to the present application. The system is applied to a processor 32 in a charging device, and the charging device further comprises a charger 41, a control switch K, a voltage acquisition module 42 and a voltage conversion circuit 43; wherein, the moving end of the control switch K is connected with the power output end of the charger 41, the first moving end is connected with the lithium battery pack, and the second moving end is connected with the second end of the voltage conversion circuit 43; the input end of the voltage acquisition module 42 is connected with the lithium battery pack, and the output end is connected with the input end of the processor 32; a first end of the voltage conversion circuit 43 is connected to the lithium battery pack; the first control end of the processor 32 is connected with the control end of the voltage conversion circuit 43, and the second control end is connected with the control end of the control switch K;
the system comprises:
a judging unit 21, configured to judge whether the current voltage of the lithium battery pack acquired by the voltage acquisition module 42 is less than a preset safety voltage;
the control unit 22 is configured to control the movable end of the control switch K to be connected with the second stationary end when the current voltage of the lithium battery pack collected by the voltage collection module is less than the preset safety voltage, so that the voltage conversion circuit 43 feeds back a first preset voltage obtained by boosting the current voltage of the lithium battery pack to the power output end of the charger 41, so that the charger 41 charges the lithium battery pack with a first charging current; the charging current output by the charger 41 and the voltage at the power supply output terminal thereof are inversely related.
For an introduction to the charging system for a lithium battery pack provided by the present application, reference is made to the above method embodiment, and the disclosure is not repeated here.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a charging device for a lithium battery pack according to the present application. The device comprises:
a memory 31 for storing a computer program;
a processor 32 for implementing the steps of the method for charging a lithium battery pack as described above when executing a computer program.
For an introduction to the charging device for a lithium battery pack provided by the present application, reference is made to the above method embodiment, and the disclosure is not repeated here.
As a preferred embodiment, the battery charger further comprises a charger 41, a control switch K, a voltage acquisition module 42 and a voltage conversion circuit 43; wherein, the moving end of the control switch K is connected with the power output end of the charger 41, the first moving end is connected with the lithium battery pack, and the second moving end is connected with the second end of the voltage conversion circuit 43; the input end of the voltage acquisition module 42 is connected with the lithium battery pack, and the output end is connected with the input end of the processor 32; a first end of the voltage conversion circuit 43 is connected to the lithium battery pack; the first control end of the processor 32 is connected with the control end of the voltage conversion circuit 43, and the second control end is connected with the control end of the control switch K;
the voltage acquisition module 42 is used for acquiring the current voltage of the lithium battery pack;
the voltage conversion circuit 43 is configured to perform voltage conversion on the current voltage of the lithium battery pack, and feed back the voltage after the voltage conversion to the power output terminal of the charger 41;
the charger 41 is configured to output a charging current inversely related to a voltage of a power output terminal thereof to charge the lithium battery pack;
the control switch K is used for connecting the power output end of the charger 41 with the lithium battery pack when the mobile end of the control switch K is connected with the first fixed end, so that the voltage of the power output end of the charger 41 is the current voltage of the lithium battery pack; when the mobile terminal is connected to the second stationary terminal, the power output terminal of the charger 41 is connected to the voltage conversion circuit 43, so that the voltage at the power output terminal of the charger 41 is the voltage obtained by converting the current voltage of the lithium battery pack by the voltage conversion circuit 43.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a charging device for a lithium battery pack according to the present application.
The device is provided with a memory 31, a processor 32, a charger 41, a control switch K, a voltage acquisition module 42 and a voltage conversion circuit 43, wherein the processor 32 controls the movable end of the control switch K so that the charger 41 charges the lithium battery pack according to the current voltage of the lithium battery pack or the voltage obtained by converting the current voltage of the lithium battery pack according to the voltage conversion circuit 43 respectively, and therefore the charging current of the charger 41 is reduced when the current voltage of the lithium battery pack is smaller than a preset safety voltage, and the normal operation of the lithium battery pack is ensured.
The computer-readable storage medium in the present application stores a computer program which, when executed by the processor 32, implements the steps of the lithium battery pack charging method described above.
For the description of the computer-readable storage medium provided by the present application, refer to the above method embodiments, and the disclosure is not repeated here.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The charging method of the lithium battery pack is characterized by being applied to a processor in a charging device, wherein the charging device further comprises a charger, a control switch, a voltage acquisition module and a voltage conversion circuit; the control switch comprises a control switch, a voltage conversion circuit, a lithium battery pack, a voltage conversion circuit, a first voltage conversion circuit, a second voltage conversion circuit and a power supply output end, wherein the movable end of the control switch is connected with the power supply output end of the charger, the first fixed end is connected with the lithium battery pack, and the second fixed end is connected with the second end of the voltage conversion circuit; the input end of the voltage acquisition module is connected with the lithium battery pack, and the output end of the voltage acquisition module is connected with the input end of the processor; the first end of the voltage conversion circuit is connected with the lithium battery pack; the first control end of the processor is connected with the control end of the voltage conversion circuit, and the second control end of the processor is connected with the control end of the control switch;
the method comprises the following steps:
judging whether the current voltage of the lithium battery pack acquired by the voltage acquisition module is smaller than a preset safety voltage or not;
if yes, the movable end of the control switch is controlled to be connected with the second fixed end, so that the voltage conversion circuit feeds back a first preset voltage after boosting the current voltage of the lithium battery pack to the power output end of the charger, and the charger charges the lithium battery pack with a first charging current; the charging current output by the charger is inversely related to the voltage of the power supply output end of the charger.
2. The method for charging a lithium battery pack according to claim 1, wherein after determining whether the current voltage of the lithium battery pack collected by the voltage collection module is less than a preset safety voltage, further comprising:
if not, the movable end of the control switch is controlled to be connected with the first fixed end, so that the charger charges the lithium battery pack with a second charging current corresponding to the current voltage of the lithium battery pack; the second charging current is greater than the first charging current.
3. The method for charging a lithium battery pack according to claim 1, wherein after determining whether the current voltage of the lithium battery pack collected by the voltage collection module is less than a preset safety voltage, further comprising:
if not, the movable end of the control switch is controlled to be connected with the second fixed end, and the voltage conversion circuit feeds back a second preset voltage after the voltage conversion of the current voltage of the lithium battery pack to the power output end of the charger, so that the charger charges the lithium battery pack with a third charging current; the third charging current is greater than the first charging current.
4. The method of charging a lithium battery pack according to claim 1, wherein the lithium battery pack comprises a plurality of lithium battery cells;
the control switch is controlled to connect the movable end and the second fixed end, so that the voltage conversion circuit feeds back a first preset voltage after boosting the current voltage of the lithium battery pack to the power output end of the charger, and the charger charges the lithium battery pack with a first charging current, and then the control switch further comprises:
judging whether the current voltage of each lithium battery cell in the lithium battery pack acquired by the voltage acquisition module is not less than the preset safety voltage;
if yes, the movable end of the control switch is controlled to be connected with the first fixed end, so that the charger charges the lithium battery pack with a fourth charging current corresponding to the current voltage of the lithium battery pack; the fourth charging current is greater than the first charging current.
5. The method of charging a lithium battery pack according to claim 1, wherein the voltage conversion circuit is a direct current/direct current DC/DC conversion circuit.
6. The method of charging a lithium battery pack according to any one of claims 1-5, wherein the processor is coupled to the lithium battery pack, the method further comprising:
judging whether the battery parameters of the lithium battery pack do not meet the conditions of preset normal parameters;
if yes, the movable end of the control switch is controlled to hang in the air, so that the charger stops charging the lithium battery pack.
7. The charging system of the lithium battery pack is characterized by being applied to a processor in a charging device, wherein the charging device further comprises a charger, a control switch, a voltage acquisition module and a voltage conversion circuit; the control switch comprises a control switch, a voltage conversion circuit, a lithium battery pack, a voltage conversion circuit, a first voltage conversion circuit, a second voltage conversion circuit and a power supply output end, wherein the movable end of the control switch is connected with the power supply output end of the charger, the first fixed end is connected with the lithium battery pack, and the second fixed end is connected with the second end of the voltage conversion circuit; the input end of the voltage acquisition module is connected with the lithium battery pack, and the output end of the voltage acquisition module is connected with the input end of the processor; the first end of the voltage conversion circuit is connected with the lithium battery pack; the first control end of the processor is connected with the control end of the voltage conversion circuit, and the second control end of the processor is connected with the control end of the control switch;
the system comprises:
the judging unit is used for judging whether the current voltage of the lithium battery pack acquired by the voltage acquisition module is smaller than a preset safety voltage or not;
the control unit is used for controlling the movable end of the control switch to be connected with the second fixed end when the current voltage of the lithium battery pack acquired by the voltage acquisition module is smaller than a preset safety voltage, so that the voltage conversion circuit feeds back a first preset voltage after boosting the current voltage of the lithium battery pack to the power output end of the charger, and the charger charges the lithium battery pack with a first charging current; the charging current output by the charger is inversely related to the voltage of the power supply output end of the charger.
8. A charging device for a lithium battery pack, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for charging a lithium battery pack according to any one of claims 1 to 6 when executing the computer program.
9. The charging device of a lithium battery pack according to claim 8, further comprising a charger, a control switch, a voltage acquisition module, and a voltage conversion circuit; the control switch comprises a control switch, a voltage conversion circuit, a lithium battery pack, a voltage conversion circuit, a first voltage conversion circuit, a second voltage conversion circuit and a power supply output end, wherein the movable end of the control switch is connected with the power supply output end of the charger, the first fixed end is connected with the lithium battery pack, and the second fixed end is connected with the second end of the voltage conversion circuit; the input end of the voltage acquisition module is connected with the lithium battery pack, and the output end of the voltage acquisition module is connected with the input end of the processor; the first end of the voltage conversion circuit is connected with the lithium battery pack; the first control end of the processor is connected with the control end of the voltage conversion circuit, and the second control end of the processor is connected with the control end of the control switch;
the voltage acquisition module is used for acquiring the current voltage of the lithium battery pack;
the voltage conversion circuit is used for performing voltage conversion on the current voltage of the lithium battery pack and feeding back the voltage after voltage conversion to the power output end of the charger;
the charger is used for outputting charging current which is inversely related to the voltage of the power supply output end of the charger so as to charge the lithium battery pack;
the control switch is used for connecting the power output end of the charger with the lithium battery pack when the moving end of the control switch is connected with the first fixed end, so that the voltage of the power output end of the charger is the current voltage of the lithium battery pack; and when the moving end of the charger is connected with the second fixed end, the power output end of the charger is connected with the voltage conversion circuit, so that the voltage of the power output end of the charger is the voltage obtained after the voltage conversion circuit performs voltage conversion on the current voltage of the lithium battery pack.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method of charging a lithium battery pack according to any one of claims 1 to 6.
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