CN113851745A - Battery cell charging control method, battery pack and parallel operation system - Google Patents
Battery cell charging control method, battery pack and parallel operation system Download PDFInfo
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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
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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
- H01M10/46—Accumulators structurally combined with charging apparatus
- H01M10/465—Accumulators structurally combined with charging apparatus with solar battery as charging system
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
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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 embodiment of the application relates to the technical field of energy storage, in particular to a battery cell charging control method. The method comprises the following steps: step i, charging the battery cell by using the charging current to obtain a first voltage value of the battery cell; step ii-1, in response to the first voltage value not being less than the first voltage threshold, reducing the charging current; step ii-2, acquiring the current charging current, and responding to the current charging current being larger than the current threshold value, and repeating the step i and the step ii-1; or step iii-1, in response to the first voltage value being less than the first voltage threshold, charging the battery cell with the charging current. When the first voltage value of the battery cell is not less than the first voltage threshold, the charging current is reduced, the charging time of the battery cell can be prolonged, the charging time of other battery cells in the parallel system which is charged with the battery cell at the same time is prolonged, the consistency between the battery cell and the battery cell is improved, and the utilization rate of photovoltaic is improved. In addition, the battery cell is always connected with the power loop of the inverter unit during charging, so that the charging and discharging of the battery cell can be conveniently switched.
Description
Technical Field
The embodiment of the application relates to the technical field of energy storage, in particular to a battery cell charging control method, a battery pack and a parallel operation system.
Background
The battery cell is a device which can convert external energy into electric energy and store the electric energy in the battery cell so as to supply power to external electric equipment at required time. After the electric energy in the battery cell is used, the battery cell can be charged through a power grid or a photovoltaic system. Generally, in order to improve the power supply capacity of a battery cell, a plurality of battery cells are stacked and then a battery pack is formed for use by electric equipment. And a controller for performing charge and discharge management on the battery cell is arranged in the battery pack. The parallel operation system is a system which connects a plurality of battery packs in parallel or in series and then is connected with an inverter unit, thereby being convenient to supply power to a load. The parallel system is provided with a controller for managing charging and discharging of the battery pack.
However, in implementing the embodiments of the present application, the applicant finds that: at present, when charging the electric core in the parallel operation system, if all the time, charge it with invariable heavy current, wherein a certain electric core may trigger to fill fully very fast, for the safety of guarantee electric core, avoid danger such as its emergence explosion, then often when other electric cores are not fully charged parallel operation system stops charging promptly, will lead to other some electric cores to charge and fill not fully, and the equilibrium between electric core and the electric core is poor.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a battery cell charging control method, a battery pack, and a parallel operation system, which overcome or partially solve the technical problem of poor balance between a battery cell and a battery cell due to full charge.
According to a first aspect of an embodiment of the present application, there is provided a cell charging control method, including: step i, charging the battery cell by using a charging current to obtain a first voltage value of the battery cell; step ii-1, in response to the first voltage value not being smaller than a first voltage threshold, reducing the charging current to charge the battery cell; step ii-2, obtaining the current charging current, responding to the current charging current being larger than the current threshold value, and repeating the step i and the step ii-1; or step iii-1, in response to the first voltage value being less than a first voltage threshold, charging the battery cell with the charging current. When the first voltage value of the battery cell is not less than the first voltage threshold, the charging current to the battery cell is reduced, so that the charging time of the battery cell can be prolonged, namely, the charging time of other battery cells in the parallel system charged together with the battery cell is prolonged, and the charging equalization time between the battery cell and the battery cell is prolonged, so that the consistency between the battery cell and the battery cell can be improved, and the charging time of the battery cell can be prolonged, and the utilization rate of photovoltaic in a photovoltaic system can also be improved. In addition, when the first voltage value is smaller than the first voltage threshold, the battery cell is charged by the charging current, and when the first voltage value of the battery cell is smaller than the first voltage threshold, the probability that the battery cell quickly reaches the full charging voltage is low, and at this time, the charging current of the battery cell does not need to be reduced, and the battery cell is charged by the charging current which is not reduced, so that the charging efficiency of the battery cell is reasonably controlled. In an alternative manner, the first voltage threshold is close to and less than a full charge voltage of the cell. Wherein the full charge voltage of the cell indicates that the cell is stopped from being charged when the first voltage value of the cell reaches the full charge voltage of the cell. That is, in the embodiment of the present application, when the first voltage value of the battery cell is less than the full charge voltage, the charge current of the battery cell is reduced, so that the charge time of the battery cell is prolonged.
In an optional manner, the cell charging control method further includes: after said step iii-1, repeating said step i and step iii-1; or after the step iii-1, repeating the steps i, ii-1 and ii-2, thereby monitoring the first voltage value of the battery cell in real time, and further reasonably controlling the charging current of the battery cell, reasonably controlling the charging efficiency of the battery cell or prolonging the charging time of the battery cell.
In an optional manner, the method for controlling the battery cell further includes: step ii-3, in response to the current charging current not being greater than the current threshold, charging the battery cell at the current threshold. Namely, when the current value of the battery cell is reduced to be lower than the current threshold, the battery cell is controlled to be charged at the current threshold, so that the charging efficiency of the battery cell is reasonably controlled.
In an optional manner, the method for controlling the battery cell further includes: step ii-4, acquiring a second voltage value of the battery cell; step ii-5-1, in response to the second voltage value not being less than a second voltage threshold, stopping charging the battery cell, wherein the first voltage threshold is less than the second voltage threshold; or step ii-5-1, in response to the second voltage value being less than a second voltage threshold, charging the cell at the current threshold. And the second voltage threshold is used for stopping charging the battery cell when the voltage value of the battery cell reaches the second voltage threshold. When the second voltage value of the battery cell is not less than the second voltage threshold, it is indicated that the battery cell is fully charged, and at this time, the battery cell is controlled to stop charging, so that the safety of the battery cell is improved. And when the second voltage value is smaller than a second voltage threshold, charging the battery cell at the current threshold until the second voltage value of the battery cell is not smaller than the second voltage threshold. When the second voltage value of the battery cell is smaller than the second voltage threshold, it is indicated that the battery cell is not fully charged, and at this time, the battery cell is controlled to be charged with the current threshold until the second voltage value of the battery cell is not smaller than the second voltage threshold, that is, until the battery cell is fully charged, the battery cell is controlled to stop charging.
In an optional manner, the step ii-1 further comprises: and reducing the charging current at a preset rate, so that the algorithm of the battery cell charging control method is simple.
In an optional manner, the step ii-2 further comprises: acquiring a current charging current after a preset time, and repeating the step i and the step ii-1 in response to the current charging current being greater than a current threshold, namely in the step i-1, in response to the first voltage value not being less than a first voltage threshold, reducing the charging current to charge the battery cell, and then acquiring the current charging current after the preset time, namely reducing the charging current for the preset time, so as to reasonably control the frequency of acquiring the current charging current of the battery cell, and after reasonably controlling the step ii-2, repeating the step i and the step ii-1, thereby reducing the calculation burden of the battery cell charging control method.
In an optional manner, the battery cell is electrically connected to an external inverter unit through a switch, and the method further includes: controlling the switch to close. Namely, the battery cell is always connected with the power loop of the inversion unit in the parallel operation system during charging, so that the charging and discharging of the battery cell can be conveniently switched.
Wherein the step of controlling the switch to be closed may be performed simultaneously with the step i, the step ii-1, the step ii-2, the step iii-1, the step ii-3, the step ii-4, the step ii-5-1, and the step ii-5-2.
According to a second aspect of the embodiments of the present application, there is provided a cell charging control system, including: the battery cell charging system comprises a first acquisition module and a first control module, wherein the first acquisition module is used for charging the battery cell by using a charging current to acquire a first voltage value of the battery cell; the first control module is used for comparing the first voltage value with a first voltage threshold, reducing the charging current to charge the battery cell when the first voltage value is not smaller than the first voltage threshold, and charging the battery cell with the charging current when the first voltage value is smaller than the first voltage threshold; the first obtaining module is further used for obtaining the current charging current, the first control module is further used for comparing the current charging current with a current threshold value, and when the current charging current is larger than the current threshold value, the first control module further reduces the charging current. Through the system, when the first voltage value of the battery cell is not less than the first voltage threshold, the charging current of the battery cell is reduced, so that the charging time of the battery cell can be prolonged, the charging time of other battery cells in the parallel system charged together with the battery cell is prolonged, the charging equalization time between the battery cell and the battery cell is prolonged, the consistency between the battery cell and the battery cell can be improved, the charging time of the battery cell is prolonged, and the utilization rate of photovoltaic in a photovoltaic system can be improved. In addition, when the first voltage value is smaller than the first voltage threshold, the battery cell is charged by the charging current, and when the first voltage value of the battery cell is smaller than the first voltage threshold, the probability that the battery cell quickly reaches the full charging voltage is low, and at this time, the charging current of the battery cell does not need to be reduced, and the battery cell is charged by the charging current which is not reduced, so that the charging efficiency of the battery cell is reasonably controlled.
According to a third aspect of the embodiments of the present application, there is provided a battery pack, including a plurality of battery cells, where the battery cells are electrically connected in series and/or in parallel, where the battery cells are suitable for the above-mentioned battery cell charging control method.
According to a fourth aspect of the embodiments of the present application, there is provided a battery pack, including a processor and a machine-readable storage medium, where the machine-readable storage medium stores machine-executable instructions thereof, and when the processor executes the machine-executable instructions, the above-mentioned battery cell charging control method is implemented.
According to a fifth aspect of the embodiments of the present application, there is provided a parallel operation system, including a plurality of battery packs as described above, the plurality of battery packs being electrically connected in series and/or in parallel.
The beneficial effects of the embodiment of the application include: the method comprises the steps of obtaining a first voltage value of the battery cell, and when the first voltage value is not smaller than a first voltage threshold value, reducing the charging current to charge the battery cell, so that the charging time of the battery cell can be prolonged, namely the charging time of other battery cells in a parallel system charged together with the battery cell is prolonged, and the charging equalization time between the battery cell and the battery cell is prolonged, so that the consistency between the battery cell and the battery cell can be improved, the charging time of the battery cell is prolonged, and the utilization rate of photovoltaic in a photovoltaic system can be improved. In addition, when the battery cell is charged, when the first voltage value of the battery cell is not less than the first voltage threshold, the charging current of the battery cell is reduced, and when the first voltage threshold is less than the full charging voltage, the battery cell is always connected with the power loop of the inverter unit in the parallel operation system when the full charging is not triggered during the charging of the battery cell, so that the charging and discharging of the battery cell can be conveniently switched. In addition, when the first voltage value is smaller than the first voltage threshold, the battery cell is charged with the charging current, and when the first voltage value of the battery cell is smaller than the first voltage threshold, it is indicated that the probability that the battery cell quickly reaches the full charging voltage is low, and at this time, the charging current of the battery cell does not need to be reduced, and the battery cell is charged with the charging current which is not reduced, so that the charging efficiency of the battery cell is reasonably controlled.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic diagram of an implementation manner of a parallel operation system provided by an embodiment of the present application;
fig. 2 is a schematic diagram of another implementation manner of a parallel operation system provided by an embodiment of the present application;
fig. 3 is a schematic flowchart of a battery cell charging control method according to an embodiment of the present application;
FIG. 4 is a graph of charging voltage and charging current versus time provided by an embodiment of the present application;
fig. 5 is a schematic diagram of a cell charging control system provided in an embodiment of the present application;
fig. 6 is a schematic hardware structure diagram of a battery pack for implementation according to an embodiment of the present disclosure;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described in detail and clearly with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In addition, the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, fig. 1 is a schematic diagram of an implementation manner of a parallel operation system according to an embodiment of the present application. The parallel operation system comprises an inversion unit and a plurality of battery packs. The inversion unit is electrically connected with the plurality of battery packs, and the inversion unit is in communication connection with the plurality of battery packs.
For the above-described inversion unit, in some embodiments, the inversion unit is referred to as an inverter.
In some embodiments, the inverter unit is electrically connected to the battery pack through a switch, and the inverter unit is electrically connected to the battery cells in the battery pack through a switch, where the switch includes a relay.
The inversion unit is used for converting direct current electric energy into alternating current electric energy, and therefore the battery pack supplies power to the outside. The inverter unit is also used for converting alternating current electric energy into direct current electric energy, so that the battery pack is charged by an external photovoltaic system or a power grid and the like. In this embodiment, the inverter unit is further configured to reduce a charging current matched to the electric core or the battery pack.
In some embodiments, the inverter unit reduces the charging current matched to the battery pack, the charging current of the battery pack is reduced, and accordingly, the charging current of each battery cell in the battery pack is also reduced.
For the plurality of battery packs, the plurality of battery packs may be connected in parallel, may be connected in series or may be connected in parallel and in a mixed manner, and different combinations of the plurality of battery packs are within the scope of the present application.
Each battery pack in a plurality of battery packs all includes controller and a plurality of electric core, and the controller is connected with a plurality of electric core electricity, and the controller is used for managing the charge-discharge of electric core.
The plurality of battery cells may be connected in parallel, may be connected in series or may be connected in parallel and in a mixed manner, and different combinations of the plurality of battery cells are within the scope of the present application.
In some embodiments, one of the plurality of battery packs is a master battery pack, and the other battery packs are slave battery packs. The controller in the main battery pack is a main controller, and the controller in the auxiliary battery pack is an auxiliary controller.
The master controller is in communication connection with the inverter unit through a communication line, and each slave controller is in communication connection with the master controller through a communication line.
In some embodiments, the plurality of battery packs are in a parallel relationship, that is, the main battery pack and the slave battery pack are not distinguished, and the master controller and the slave controller are not distinguished, and the controller in each battery pack is in communication connection with the inverter unit. Whether the main battery pack and the slave battery pack are distinguished or not, the battery cell in the battery pack is suitable for the charging method of the battery cell provided by the embodiment of the application.
In some embodiments, referring to fig. 2, the inverter unit is further electrically connected to a photovoltaic system, and the photovoltaic system supplies power to the battery pack and the battery cells in the battery pack through the inverter unit.
In the prior art, the applicant finds that, when the cells in the parallel operation system are charged, if the cells are charged with a constant large current all the time, a certain cell may be triggered to be fully charged very quickly, in order to guarantee the safety of the cells and avoid the danger of explosion and the like, the parallel operation system often stops charging when other cells are not fully charged, which may cause that some other cells are not fully charged, and the balance between the cells is poor.
Based on this, the embodiment of the application provides a battery cell charging control method, so as to overcome or at least partially solve the technical problem that the balance between a battery cell and a battery cell is poor due to full charging.
Example one
Referring to fig. 3, fig. 3 is a schematic flowchart of a battery cell charging control method according to an embodiment of the present disclosure, where the method includes the following steps:
and step i, charging the battery cell by using the charging current, acquiring a first voltage value of the battery cell, executing step ii-1 when responding that the first voltage value is not less than a first voltage threshold, and executing step iii-1 when responding that the first voltage value is less than the first voltage threshold.
And i, the first voltage value of the battery cell is the current voltage value of the battery cell, that is, the voltage value of the battery cell when the action of "acquiring" in the step i is executed.
Wherein the first voltage threshold is close to and less than a full charge voltage of the cell, wherein the full charge voltage of the cell indicates that charging of the cell is stopped in response to the first voltage value of the cell reaching the full charge voltage of the cell.
In one embodiment, the full-charge voltage is 3.5 volts, and the first voltage threshold may be set to 3.48 volts, or the first voltage threshold may be set to other values, such as 3.45 volts or 3.46 volts, and the first voltage threshold is not specifically limited in this application.
And step ii-1, reducing the charging current to charge the battery cell.
In some embodiments, the method for reducing the charging current to charge the battery cell is to reduce the charging current at a preset rate, that is, the rate of reduction of the charging current of the battery cell is constant, the charging current of the battery cell is linearly reduced, and by reducing the charging current of the battery cell at the preset rate, the algorithm of the battery cell charging control method is simple.
In other embodiments, the method of decreasing the charge current to the cells may also decrease at a non-constant rate.
When the battery cell is in the parallel operation system, reducing the charging current of the battery cell firstly reduces the charging current of the whole parallel operation system, then reduces the charging current of the battery pack where the battery cell is located, and finally reduces the charging current distributed to each battery cell.
In this embodiment of the application, when the first voltage value of the battery cell is not less than the first voltage threshold and is less than the full charge voltage, the charging current to the battery cell is reduced, so that the charging time to the battery cell can be prolonged, that is, the charging time to other battery cells in the parallel operation system charged together with the battery cell is prolonged, and the charging equalization time between the battery cell and the battery cell is prolonged, so that the consistency between the battery cell and the battery cell can be improved, and the utilization rate of the photovoltaic in the photovoltaic system can also be improved by prolonging the charging time to the battery cell.
And step ii-2, acquiring the current charging current, repeating the steps i and ii-1 when the current charging current is larger than the current threshold value, until the current charging current is not larger than the current threshold value, and executing the step ii-3 when the current charging current is not larger than the current threshold value.
Wherein the current charging current is the current charging current value of the battery cell, that is, the current value for charging the battery cell when the action of "acquiring" in step ii-2 is performed.
The current threshold comprises a minimum allowable charging current of the battery cell, and is a preset minimum current value allowing the battery cell to be charged.
Referring to fig. 3 and 4 together, fig. 4 is a graph of a charging current and a charging voltage of the battery cell versus time, and when the current charging current of the battery cell is greater than the current threshold, step i and step ii-1 are repeated, that is, another cycle started in step i is executed, so as to monitor the first voltage value of the battery cell, and further, the charging current of the battery cell can be reasonably controlled, and the charging time of the battery cell is prolonged.
And when the current charging current is not larger than the current threshold, further controlling the battery cell to be charged by using the current threshold until the voltage value of the battery cell reaches the full charging voltage, and then stopping charging the battery cell.
In some embodiments, step ii-2 further comprises obtaining a present charging current after a preset time, and repeating steps i and ii-1 in response to the present charging current being greater than the current threshold. In step i-1, in response to that the first voltage value is not less than the first voltage threshold, the current charging current is obtained after the battery cell is charged by reducing the charging current, that is, the charging current is reduced for a preset time, so that the frequency of obtaining the current charging current of the battery cell is reasonably controlled, and after step ii-2, the frequencies of step i and step ii-1 are reasonably controlled, so that the calculation burden of the battery cell charging control method is reduced. And step iii-1, charging the battery cell with the charging current.
Step iii-1 is performed after step i, in response to that the first voltage value of the battery cell is smaller than the first voltage threshold, and in response to that the first voltage value of the battery cell is smaller than the first voltage threshold, the probability that the battery cell quickly reaches the full charge voltage is small, so that the charging current to the battery cell does not need to be reduced, and in some other embodiments, the charging current to the battery cell may also be reduced, so as to prolong the time for charging the battery cell.
The charging current is the current value of the cell that has not been reduced in the cycle initiated by step i, compared to the present charging current of the cell.
After the step Siii-1, that is, after the step of charging the cells with the charging current in response to the first voltage value being smaller than the first voltage threshold, repeating the steps i and iii-1, or, repeating the steps i, ii-1 and ii-2, that is, entering the next cycle started by the step i, so as to monitor the first voltage value of the cells, and once the first voltage value of the cells is not smaller than the first voltage threshold, entering the step ii-1, so as to reduce the charging current to the cells, thereby reasonably prolonging the charging time of the cells and improving the consistency among the cells. And when the first voltage value is smaller than the first voltage threshold, the battery cell is charged by the charging current which is not reduced, so that the charging efficiency of the battery cell is reasonably controlled.
And step ii-3, charging the battery cell at a current threshold value and executing step ii-4.
And step ii-3 is executed when the current charging current is not greater than the current threshold, that is, when the current value of the battery cell is reduced to be lower than the current threshold or is reduced to be lower than the current threshold, the battery cell is controlled to be charged at the current threshold until the voltage of the battery cell reaches the full-charge voltage, so that the charging efficiency of the battery cell is reasonably controlled.
And step ii-4, acquiring a second voltage value of the battery cell, and executing step ii-5-1 in response to the second voltage value not being less than a second voltage threshold, or executing step ii-5-2 in response to the second voltage value being less than the second voltage threshold until the second voltage value of the battery cell is not less than the second voltage threshold. Wherein, step ii-5-2 is the same as the method of step ii-3, and the cell is charged with the current threshold, except that the response conditions of the two are different.
And comparing the second voltage value of the battery cell with the first voltage value of the battery cell, wherein the second voltage value of the battery cell is the current voltage value of the battery cell, and the second voltage value is the current voltage value of the battery cell when the action of acquiring in the step ii-4 is executed, and the step ii-3 is executed in the cycle started by the step i, so that the battery cell is charged by using the current threshold.
And the second voltage threshold is used for stopping charging the battery cell when the voltage value of the battery cell reaches the second voltage threshold.
Wherein the first voltage threshold is less than the second voltage threshold.
And in response to that the second voltage value of the battery cell is not less than the second voltage threshold, indicating that the battery cell is fully charged, and executing step ii-5-1 to stop charging the battery cell, thereby improving the safety of the battery cell. And responding to that the second voltage value of the battery cell is smaller than the second voltage threshold value, indicating that the battery cell is not fully charged, controlling the battery cell to be charged with the current threshold value at the moment, and controlling the battery cell to stop charging until the second voltage value of the battery cell is not smaller than the second voltage threshold value, namely, the battery cell is fully charged.
And step ii-5-1, controlling the battery cell to stop charging.
In some embodiments, the battery cell is connected to the external inverter unit through a switch, and the battery cell charging control method further includes controlling the switch to be closed. Wherein the step of controlling the switch to close may be performed simultaneously with the steps i, ii-1, ii-2, iii-1, ii-3, ii-4, ii-5-1 and ii-5-2. Namely, the battery cell is always connected with the power loop of the inversion unit in the parallel operation system during charging, so that the charging and discharging of the battery cell can be conveniently switched, and the situation that the on-off of the switch is repeatedly controlled when the charging and discharging of the battery pack are switched is avoided.
In some embodiments, the application purpose of prolonging the charging time of the battery cell, improving the consistency between the battery cells and the like can be achieved by not including the step ii-3, the step ii-4, the step ii-5-1 and the step ii-5-2 but only including the step i, the step ii-1, the step ii-2, the step iii-1 and a cycle started by the step i.
The above steps i, ii-1, ii-2, iii-1, ii-3, ii-4, ii-5-1 and ii-5-2 do not limit the order of the cell charging control method of the present application, and the exchange of any reasonable order between the steps i, ii-1, ii-2, iii-1, ii-3, ii-4, ii-5-1 and ii-5-2 before and after the steps is within the protection scope of the present application.
For convenience of understanding the technical solution of the present application, a method for controlling battery cell charging according to the present application will be further described with reference to fig. 4. Fig. 4 is a graph of a charging current and a charging voltage (a terminal voltage of a cell, corresponding to the above first voltage value) of a cell versus time provided in an embodiment of the present application. The battery cell is charged by the charging current, the charging voltage of the battery cell is continuously increased, when the acquired charging voltage is not less than the first voltage threshold, the charging current is reduced to charge the battery cell, the charging voltage of the battery cell is reduced at the moment, when the charging voltage is less than the first voltage threshold, the battery cell is charged by the reduced charging current, and the charging voltage is continuously increased at the moment. When the battery cell is charged by reducing the charging current, the current charging current of the battery cell is obtained, the current charging current is the charging current after being reduced, the step of repeatedly obtaining the charging voltage is carried out in response to the fact that the current charging current is larger than the current threshold, the step of continuously reducing the charging current to charge the battery cell is repeatedly carried out in response to the fact that the obtained charging voltage is not smaller than the first voltage threshold, when the current charging current is not larger than the current threshold, the battery cell is charged by the current threshold, and when the charging voltage of the battery cell reaches the second voltage threshold, the battery cell is fully charged, and the charging of the battery cell can be stopped. The charging voltage is repeatedly acquired, and the number of times of repeating the charging of the battery cell by reducing the charging current is related to the actual charging condition of the battery cell in response to the fact that the acquired charging voltage is not smaller than the first voltage threshold, which is not limited to the condition shown in fig. 4 of the present application.
In this embodiment of the application, through step i, a battery cell is charged with a charging current to obtain a first voltage value of the battery cell, step ii-1, when the first voltage value is not less than a first voltage threshold, the charging current is reduced to charge the battery cell, step ii-2, a current charging current is obtained, when the current charging current is greater than a current threshold, step i and step ii-1 are repeated until the current charging current is not greater than the current threshold, so that a time for charging the battery cell, that is, a time for charging other battery cells in a parallel operation system that is charged together with the battery cell, is extended, and a time for charge equalization between the battery cell and the battery cell is extended, thereby improving consistency between the battery cell and the battery cell, extending a time for charging the battery cell, and further improving a utilization rate of photovoltaics in the photovoltaic system. In addition, when the battery cell is charged, when the first voltage value of the battery cell is not smaller than the first voltage threshold, the charging current to the battery cell is reduced, and when the first voltage threshold is smaller than the full charging voltage, when the battery cell is charged without triggering the full charging, the battery cell can be always connected with the power loop of the inverter unit in the parallel operation system, so that the switching of charging and discharging of the battery cell can be conveniently realized. In addition, when the first voltage value is smaller than the first voltage threshold, the battery cell is charged by the charging current, and when the first voltage value of the battery cell is smaller than the first voltage threshold, the probability that the battery cell quickly reaches the full charging voltage is low, the charging current of the battery cell does not need to be reduced at this moment, and the battery cell is charged by the charging current which is not reduced, so that the charging efficiency of the battery cell is reasonably controlled.
Example two
Referring to fig. 5, fig. 5 is a schematic diagram of a battery cell charging control system according to an embodiment of the present disclosure, where the battery cell charging control system includes: a first acquisition module 1 and a first control module 2. The first obtaining module 1 is configured to charge the battery cell with a charging current to obtain a first voltage value of the battery cell; the first control module 1 is configured to compare the first voltage value with a first voltage threshold, reduce the charging current to charge the battery cell when the first voltage value is not smaller than the first voltage threshold, and charge the battery cell with the charging current when the first voltage value is smaller than the first voltage threshold; the first obtaining module 1 is further configured to obtain a current charging current, the first control module 2 is further configured to compare the current charging current with a current threshold, and when the current charging current is greater than the current threshold, the first control module 2 further reduces the charging current. In the embodiment of the application, a first obtaining module 1 is used for charging a battery cell with a charging current to obtain a first voltage value of the battery cell; comparing the first voltage value with a first voltage threshold value through a first control module 1, when the first voltage value is not smaller than the first voltage threshold value, reducing the charging current to charge the battery cell, and when the first voltage value is smaller than the first voltage threshold value, charging the battery cell with the charging current through a first control module 2; the current charging current is obtained through the first obtaining module 1, the current charging current is compared with the current threshold value through the first control module 2, and when the current charging current is larger than the current threshold value, the charging current is further reduced through the first control module 2. Through the device, the time for charging the battery cell can be prolonged, namely, the time for charging other battery cells in the parallel system which is charged together with the battery cell is prolonged, and the time for equalizing the charging between the battery cell and the battery cell is prolonged, so that the consistency between the battery cell and the battery cell can be improved, and the time for charging the battery cell can also improve the utilization rate of photovoltaic in a photovoltaic system. In addition, when the battery cell is charged, when the first voltage value of the battery cell is not smaller than the first voltage threshold, the charging current to the battery cell is reduced, and when the first voltage threshold is smaller than the full charging voltage, when the battery cell is charged without triggering the full charging, the battery cell can be always connected with the power loop of the inverter unit in the parallel operation system, so that the switching of charging and discharging of the battery cell can be conveniently realized. In addition, when the first voltage value is smaller than the first voltage threshold, the battery cell is charged by the charging current, and when the first voltage value of the battery cell is smaller than the first voltage threshold, the probability that the battery cell quickly reaches the full charging voltage is low, the charging current of the battery cell does not need to be reduced at this moment, and the battery cell is charged by the charging current which is not reduced, so that the charging efficiency of the battery cell is reasonably controlled.
EXAMPLE III
The embodiment of the application provides a battery pack, the structure of the battery pack can refer to fig. 1 or fig. 2, the battery pack includes a plurality of battery cells, the plurality of battery cells are connected in parallel and/or in series, and the battery cells are suitable for the battery cell charging control method in the first embodiment.
In some embodiments, the battery pack further includes a controller, and the battery pack is applied to a parallel operation system, and the controller may be the master controller or the slave controller.
Referring to fig. 6, the controller includes: one or more processors and a machine-readable storage medium, such as the one shown in FIG. 6. The processor and the machine-readable storage medium may be connected by a bus or other means, and in the embodiments of the present application, the connection by the bus is taken as an example.
The machine-readable storage medium, which is a non-volatile computer-readable storage medium, may be used to store a non-volatile software program, a non-volatile computer-executable program, and modules, such as program instructions/modules (for example, the respective modules shown in fig. 5) corresponding to the cell charging control method in the embodiment of the present application. The processor executes various functional applications and data processing of the cell charging control method by running a non-volatile software program, instructions and modules stored in a machine-readable storage medium, that is, the cell charging control method of the above-described method embodiment is implemented.
The machine-readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data and the like created according to the use of the cell charge control system and the charge control device of the battery pack. Additionally, the machine-readable storage medium may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk, flash memory device, or other non-volatile solid state memory device. In some embodiments, the machine-readable storage medium optionally includes machine-readable storage media remotely disposed from the processor, which may be connected to the cell charging control system via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in a machine-readable storage medium, and in response to being executed by one or more processors, perform the cell charging control method of any of the method embodiments described above.
The controller in the embodiment of the application can execute the method provided by the embodiment of the application, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, and the program can be stored in a computer readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A battery cell charging control method is characterized in that the method further comprises the following steps:
step i, charging the battery cell by using a charging current to obtain a first voltage value of the battery cell;
step ii-1, in response to the first voltage value not being smaller than a first voltage threshold, reducing the charging current to charge the battery cell;
step ii-2, obtaining the current charging current, responding to the current charging current being larger than the current threshold value, and repeating the step i and the step ii-1;
or
Step iii-1, in response to the first voltage value being less than a first voltage threshold, charging the battery cell with the charging current.
2. The cell charge control method according to claim 1, further comprising:
after said step iii-1, repeating said step i and step iii-1;
or
After the step iii-1, repeating the steps i, ii-1 and ii-2.
3. The cell charge control method according to claim 1 or 2, characterized by further comprising:
step ii-3, in response to the current charging current not being greater than the current threshold, charging the battery cell at the current threshold.
4. The cell charge control method according to claim 3, further comprising:
step ii-4, acquiring a second voltage value of the battery cell;
step ii-5-1, in response to the second voltage value not being less than a second voltage threshold, stopping charging the battery cell, wherein the first voltage threshold is less than the second voltage threshold;
or
And step ii-5-2, in response to the second voltage value being smaller than a second voltage threshold, charging the battery cell with the current threshold.
5. The cell charging control method according to claim 1 or 2, wherein the step ii-1 further comprises: reducing the charging current at a preset rate.
6. The cell charging control method according to claim 1 or 2, wherein the step ii-2 further comprises: and acquiring the current charging current after a preset time, and repeating the step i and the step ii-1 in response to the current charging current being greater than a current threshold value.
7. The cell charging control method according to claim 1 or 2, wherein the cell is electrically connected to an external inverter unit through a switch, and the method further comprises: controlling the switch to close.
8. A cell charging control system, the system comprising:
the first acquisition module is used for charging the battery cell by using the charging current to acquire a first voltage value of the battery cell;
the first control module is used for comparing the first voltage value with a first voltage threshold, reducing the charging current to charge the battery cell when the first voltage value is not smaller than the first voltage threshold, and charging the battery cell with the charging current when the first voltage value is smaller than the first voltage threshold;
the first obtaining module is further used for obtaining the current charging current, the first control module is further used for comparing the current charging current with a current threshold value, and when the current charging current is larger than the current threshold value, the first control module further reduces the charging current.
9. A battery pack is characterized by comprising a plurality of battery cells, wherein the battery cells are electrically connected in series and/or in parallel, and the battery cells are suitable for the battery cell charging control method according to any one of claims 1 to 7.
10. A battery pack comprising a processor and a machine-readable storage medium storing machine-executable instructions executable by the processor, the processor implementing the cell charging control method according to any one of claims 1 to 7 when executing the machine-executable instructions.
11. A parallel operation system, comprising a plurality of battery packs according to claim 9 or 10, wherein the plurality of battery packs are electrically connected in series and/or in parallel, and the parallel operation system is electrically connected with the battery packs.
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Application publication date: 20211228 |