CN112737032B - Battery charging control method, control device and terminal - Google Patents
Battery charging control method, control device and terminal Download PDFInfo
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- CN112737032B CN112737032B CN202011598673.3A CN202011598673A CN112737032B CN 112737032 B CN112737032 B CN 112737032B CN 202011598673 A CN202011598673 A CN 202011598673A CN 112737032 B CN112737032 B CN 112737032B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- 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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- 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 invention is applicable to the technical field of battery charging, and provides a battery charging control method, a battery charging control device, a terminal and a computer readable storage medium. Wherein the battery comprises more than two lithium battery cells connected in series; the control method comprises the following steps: monitoring a battery voltage; when the voltage of the battery is not more than the preset highest voltage for pre-charging, pre-charging the battery in a first charging mode; when the battery voltage is larger than the pre-charging highest voltage and not larger than the preset constant-current charging highest voltage, carrying out constant-current charging on the battery in a second charging mode; and when the battery voltage is greater than the highest constant current charging voltage, carrying out the post-charging on the battery in a third charging mode. The invention is beneficial to prolonging the service life of the battery.
Description
Technical Field
The present invention relates to the field of battery charging technologies, and in particular, to a battery charging control method, a control device, a terminal, and a computer readable storage medium.
Background
At present, with the continuous growth of the market and the continuous perfection of the lithium battery technology, the cost of the lithium battery is greatly reduced, and a large number of lithium batteries are put into application in various power equipment.
Since lead-acid batteries are widely used in the market before, the corresponding battery charging control method is also aimed at lead-acid batteries, such as a common charge control method of charging firstly uniformly and then floating; however, lithium batteries have characteristics different from lead-acid batteries, and existing charging control methods are not suitable for lithium batteries, and even seriously affect the service life of lithium batteries.
Disclosure of Invention
In view of the above, the present invention provides a battery charging control method, a control device, a terminal and a computer readable storage medium, so as to solve the problem that the existing charging control method is not suitable for a lithium battery and even seriously affects the service life of the lithium battery.
A first aspect of an embodiment of the present invention provides a control method for charging a battery including two or more lithium battery cells connected in series, the control method including:
monitoring a battery voltage;
when the voltage of the battery is not more than the preset highest voltage for pre-charging, pre-charging the battery in a first charging mode;
when the battery voltage is larger than the pre-charging highest voltage and not larger than the preset constant-current charging highest voltage, carrying out constant-current charging on the battery in a second charging mode;
When the battery voltage is greater than the highest constant current charging voltage, the battery is charged in a third charging mode in a later period;
the first charging mode, the second charging mode and the third charging mode are all charging modes for charging the battery by controlling charging current, and the charging currents controlled in different charging modes are different;
wherein the precharge maximum voltage is less than the constant current charge maximum voltage; the charging phases corresponding to the first charging mode and the third charging mode represent charging phases in which the pressure difference of each lithium battery cell is larger than a specified pressure difference, and the charging phases corresponding to the second charging mode represent charging phases in which the pressure difference of each lithium battery cell is not larger than the specified pressure difference.
Based on the first aspect, in a first possible implementation manner of the first aspect, when the battery voltage is not greater than a preset precharge highest voltage, precharging the battery in the first charging mode includes:
when the voltage of the battery is not greater than a preset first pre-charging voltage, carrying out constant-current pre-charging on the battery by using a first charging current;
and when the battery voltage is not less than the first pre-charging voltage and not more than the pre-charging highest voltage, carrying out variable-current pre-charging on the battery by using a first variable charging current, wherein the magnitude of the first variable charging current is positively related to the battery voltage, the minimum value of the first variable charging current is the first charging current, and the first charging current is smaller than the nominal capacity of the battery in value.
In a second possible implementation manner of the first aspect, based on the first aspect, the constant current charging the battery in the second charging mode includes:
the battery is charged with a constant current at a second charging current that is not less in value than the nominal capacity of the battery.
In a third possible implementation manner of the first aspect, when the battery voltage is greater than the constant current charging highest voltage, the post-charging the battery in the third charging mode includes:
when the battery voltage is larger than the highest constant current charging voltage and is not larger than a preset first later charging voltage, carrying out variable current later charging on the battery by using a second variable charging current;
when the battery voltage is larger than the first later charging voltage and not larger than the preset trickle charging voltage, carrying out constant-current later charging on the battery by using a third charging current;
wherein the magnitude of the second varying charging current is inversely related to the battery voltage, and the minimum value of the second varying charging current is the third charging current.
In a fourth possible implementation manner of the first aspect, based on the third possible implementation manner of the first aspect, when the battery voltage is greater than the constant current charging highest voltage, the performing the post-charging on the battery in the third charging mode further includes: and when the voltage of the battery is not smaller than the trickle charge voltage, trickle charging the battery by a third charge current, and stopping charging the battery when the trickle charge meets the preset condition.
In a fifth possible implementation manner of the first aspect, based on the fourth possible implementation manner of the first aspect, the trickle charging the battery with the third charging current includes: and charging the battery for a preset time period at preset time intervals by using a third charging current.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, stopping charging the battery when the trickle charge meets a preset condition includes:
stopping charging the battery when the specified trickle charge times are reached; wherein, the trickle charge of the battery for a preset time period with the third charging current is regarded as a trickle charge frequency.
A second aspect of an embodiment of the present invention provides a control device for charging a battery including two or more lithium battery cells connected in series, the control device including:
a battery voltage monitoring unit for monitoring a battery voltage;
the battery voltage monitoring unit is used for monitoring the voltage of the battery to be not more than a preset maximum voltage for pre-charging;
the constant-current charging unit is used for carrying out constant-current charging on the battery in a second charging mode when the battery voltage monitoring unit monitors that the battery voltage is greater than the pre-charging highest voltage and not greater than the preset constant-current charging highest voltage;
The battery voltage monitoring unit is used for monitoring the voltage of the battery to be higher than the constant current charging highest voltage, and the battery is charged in a first charging mode;
the first charging mode, the second charging mode and the third charging mode are all charging modes for charging the battery by controlling charging current, and the charging currents controlled in different charging modes are different;
the minimum charging voltage, the precharge highest voltage, the constant current charging highest voltage and the trickle charging voltage are sequentially increased; the charging phases corresponding to the first charging mode and the third charging mode represent charging phases in which the pressure difference of each lithium battery cell is larger than a specified pressure difference, and the charging phases corresponding to the second charging mode represent charging phases in which the pressure difference of each lithium battery cell is not larger than the specified pressure difference.
A third aspect of an embodiment of the present invention provides a terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method for controlling battery charging according to any one of the claims when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method of controlling battery charging as claimed in any one of the preceding claims.
Compared with the prior art, the invention has the beneficial effects that:
the invention monitors the battery voltage; when the voltage of the battery is not less than the lowest charging voltage of the battery and not more than the preset highest pre-charging voltage, pre-charging the battery in a first charging mode; when the voltage of the battery is larger than the pre-charging highest voltage and not larger than the preset constant-current charging highest voltage, the battery is subjected to constant-current charging in a second charging mode; and when the voltage of the battery is larger than the highest constant-current charging voltage and is not larger than the preset trickle charging voltage, performing constant-voltage post-charging on the battery in a third charging mode. The charging stages corresponding to the first charging mode and the third charging mode represent charging stages in which the pressure difference of each lithium battery monomer is larger than the specified pressure difference, the charging stages corresponding to the second charging mode represent charging stages in which the pressure difference of each lithium battery monomer is not larger than the specified pressure difference, and the batteries are charged in different charging stages by controlling different charging currents, so that the influence of the overlarge pressure difference of each lithium battery monomer on the service lives of the batteries is reduced, intelligent charging management of the lithium batteries is realized, the lithium batteries are enabled to work more stably, and the service life of the lithium batteries is longer.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a cell equalization curve provided in an embodiment of the present invention;
FIG. 2 is a flowchart of one implementation of a method for controlling battery charging provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery charging control device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, a schematic diagram of a single-cell (single-cell) equalization curve of a battery according to an embodiment of the present invention is shown, where the single-cell equalization curve of the battery is obtained at a 1C charging current.
In the embodiment of the invention, the 1C charging current refers to a current of 1 time of the nominal capacity of the battery, for example, for a battery with a nominal capacity of 2600 milliampere hours (mAh), the current of 1 time of the nominal capacity of the battery is equal to 2600ma, and the battery can be fully charged for 1 hour.
As shown in fig. 1, the left ordinate is the cell voltage (from 2.8V to 3.6V), and the right ordinate is the single-core maximum-minimum voltage value (from 0V to 400V); the upper curve represents voltages corresponding to a plurality of lithium battery cells, and the method can be roughly divided into three stages, wherein the voltage curves of the lithium battery cells in the second stage (middle part) are concentrated and even overlapped, and represent that the voltage differences of the lithium battery cells are not large and even equal; the first stage (left rising portion) and third stage (right rising portion) curves are separated from each other in the middle, which means that there is a certain voltage difference between the voltages of the lithium battery cells. The lower curve is the corresponding single voltage differential line.
From the cell voltage differential lines shown in fig. 1, it can be seen that:
first, when the cell voltage of the battery reaches 3.2V under the charging condition, the cell voltage difference is within 50mV, and the cell voltage difference tends to decrease.
Secondly, when the voltage of the battery cell is 3.2V to 3.4V, the cell voltage difference is within 50mV, the balance is good, and the battery cell is suitable for high-current charging.
Third, after the cell voltage reaches 3.4V, the cell voltage difference is gradually amplified, and in this case, the larger the charging current, the larger the single-cell voltage difference is.
The invention is based on the battery cell equalization curve and carries out battery charging design according to three conclusions obtained by the curve, and the provided charging control method is more suitable for battery characteristics and is beneficial to prolonging the service life of the battery.
In the method for controlling battery charging provided by the embodiment of the invention, the battery refers to a lithium battery pack or a lithium battery pack, and the battery comprises more than two lithium battery monomers connected in series.
Referring to fig. 2, a flowchart of an implementation of a method for controlling battery charging according to an embodiment of the present invention is shown, and is described in detail as follows:
in step 201, monitoring battery voltage;
In the embodiment of the invention, the battery voltage, that is, the voltage of the battery to be charged, needs to be monitored first, so that the corresponding charging mode can be adapted according to the current battery voltage.
In an embodiment of the present invention, the monitored battery voltage may be a voltage of a lithium battery pack or a lithium battery pack, for example, for a lithium battery pack including 5 lithium battery cells connected in series, the monitored battery voltage corresponds to a sum of voltages of the 5 lithium battery cells.
In step 202, when the battery voltage is not greater than a preset maximum precharge voltage, precharging the battery in a first charging mode;
in the embodiment of the invention, the charging stage corresponding to the first charging mode represents the charging stage in which the pressure difference of each lithium battery cell is larger than the specified pressure difference, the current stage is represented when the battery voltage is not larger than the preset pre-charging highest voltage, and the charging stage is not suitable for charging by adopting large current, so that the battery can be controlled to be slowly charged by adopting smaller charging current, the pressure difference among each lithium battery cell is reduced, and the influence of the pressure difference on the service life of the lithium battery cell is reduced.
Optionally, the step 202 may include:
when the battery voltage is smaller than the preset minimum charging voltage, outputting alarm information for indicating the damage of the battery;
When the battery voltage is not less than a preset minimum charging voltage and not more than a preset maximum pre-charging voltage, the battery is pre-charged in a first charging mode.
In the embodiment of the invention, a minimum charging voltage may be set, that is, if the battery voltage is monitored to be too low, it means that the battery is damaged and the battery is not charged, so that the battery can not be charged when the battery voltage is monitored to be lower than the preset minimum charging voltage.
For example, in one embodiment, when the lithium cell voltage is less than 2V for a lithium iron phosphate battery, it may be considered that the battery is damaged, and then the lowest charging voltage may be set to 2V times the number of lithium cells, for example, for a lithium battery pack including 5 lithium cells connected in series, the lowest charging voltage may be set to 10V. And charging the battery only when the monitored battery voltage is not less than the minimum charging voltage. Otherwise, a battery damage alarm indication may be output.
In an alternative embodiment, the step 202 may include:
when the voltage of the battery is not greater than a preset first pre-charging voltage, carrying out constant-current pre-charging on the battery by using a first charging current;
And when the battery voltage is not less than the first pre-charging voltage and not more than the pre-charging highest voltage, carrying out variable-current pre-charging on the battery by using a first variable charging current, wherein the magnitude of the first variable charging current is positively related to the battery voltage, the minimum value of the first variable charging current is the first charging current, and the first charging current is smaller than the nominal capacity of the battery in value.
In this embodiment, the first charging mode may be further divided into two charging phases, and the dividing boundary may be defined by the first precharge voltage.
The first stage in the first charging mode is a stage in which the current capacity of the battery is substantially 0, and since the battery is very poor in balance and is not suitable for high-current charging at this time, constant-current pre-charging can be performed by using a first charging current (small current);
the second stage in the first charging mode may be to increase the charging current slowly when the current capacity of the battery reaches about 3% -6% of the nominal capacity, and perform variable-current precharge with the first variable charging current.
In one example, the first charging current may be 0.05C, i.e., a current corresponding to 0.05 times the nominal capacity of the battery. The first varying charging current may be a variable current gradually increasing from 0.05C to 1C.
In this embodiment, the first precharge voltage is used to divide the two charging stages in the first charging mode, and according to the characteristic curve of fig. 1, the first precharge voltage may be specifically 2.7V for the lithium battery cells, and may be 2.7V for the battery including more than two lithium battery cells connected in series.
In step 203, when the battery voltage is greater than the pre-charging maximum voltage and not greater than the preset constant-current charging maximum voltage, performing constant-current charging on the battery in a second charging mode;
in the embodiment of the invention, the charging stage corresponding to the second charging mode represents a charging stage in which the voltage difference of each lithium battery cell is not greater than a specified voltage difference, and the current stage is represented when the battery voltage is detected to be greater than the pre-charging highest voltage and not greater than the preset constant current charging highest voltage, and in the charging stage, the voltage difference between each lithium battery cell is not greater, so that the charging speed can be increased by adopting high current charging.
In the embodiment of the invention, a constant current charging highest voltage can be set, when the battery voltage is larger than the pre-charging highest voltage and not larger than the preset constant current charging highest voltage, the battery is subjected to constant current charging in a second charging mode, and at the stage, the battery cell voltages are basically balanced, and the lithium battery supports large current charging at the moment, so that the constant current charging can be performed by adopting larger current.
In this embodiment, according to the characteristic curve of fig. 1, the constant current charging highest voltage may be set to 3.4V for lithium battery cells, and the first precharge voltage may be 3.4v×the number of lithium battery cells for a battery including two or more lithium battery cells connected in series.
Optionally, in step 203, performing constant current charging on the battery in the second charging mode may include: the battery is charged with a constant current at a second charging current that is not less in value than the nominal capacity of the battery.
At this stage, the second charging current may be a current corresponding to the nominal capacity of the battery, i.e. a 1C current.
In step 204, when the battery voltage is greater than the constant current charging highest voltage, the battery is charged in a third charging mode.
In the embodiment of the invention, the charging stage corresponding to the third charging mode represents the charging stage in which the pressure difference of each lithium battery cell is larger than the specified pressure difference, and the current stage is represented when the battery voltage is detected to be larger than the highest constant current charging voltage, and the charging stage is not suitable for charging by adopting large current, so that the battery can be controlled to be slowly charged by adopting smaller charging current, the pressure difference among each lithium battery cell is reduced, and the influence of the pressure difference on the service life of the lithium battery cell is reduced.
Optionally, in one embodiment, the step 204 may include:
when the battery voltage is larger than the highest constant current charging voltage and is not larger than a preset first later charging voltage, carrying out variable current later charging on the battery by using a second variable charging current;
when the battery voltage is larger than the first later charging voltage and not larger than the preset trickle charging voltage, carrying out constant-current later charging on the battery by using a third charging current;
wherein the magnitude of the second varying charging current is inversely related to the battery voltage, and the minimum value of the second varying charging current is the third charging current.
In this stage, since the battery voltage increases to a level higher than the maximum constant current charging voltage, the battery cell voltage balance gradually begins to drift, and if the battery is still charged with a large current, the battery imbalance is likely to occur, so that the battery charging current needs to be adjusted downward at this time, and the charging current in this stage is less than 1 time of the current corresponding to the nominal capacity of the battery (i.e., less than 1C).
In this embodiment, the trickle charge voltage may be set to 3.52v×lithium battery cell number according to the characteristic curve of fig. 1.
In this embodiment, the third charging mode may be further divided into two charging phases, and the dividing boundary may be defined by the first post charging voltage.
The first stage in the third charging mode is a stage when the current capacity of the battery is fast and is not full, and the charging current of the battery needs to be adjusted downward at this time.
The second stage in the third charging mode can be a stage that the current capacity of the battery reaches to be full, at the moment, the single-core voltage of the battery is unbalanced, and the battery management system can start an equalizing circuit, so that the charging current cannot be overlarge at the moment, otherwise, the equalizing circuit has limited power and cannot timely equalize the single-core voltage of the battery, and therefore, constant-current charging is required to be carried out by adopting small current.
In one example, the second varying charging current may be a current gradually decreasing from 1C to 0.05C, and the third charging current may be a current of 0.05C; the first post-charge voltage may be 3.45V.
Optionally, in an embodiment, in step 204, when the battery voltage is greater than the constant current charging highest voltage, the post-charging the battery in the third charging mode may further include:
and when the voltage of the battery is not smaller than the trickle charge voltage, trickle charging the battery by a third charge current, and stopping charging the battery when the trickle charge meets the preset condition.
In the embodiment of the invention, the lowest charging voltage, the highest pre-charging voltage, the highest constant-current charging voltage and the trickle charging voltage are sequentially increased.
In the embodiment of the invention, when the battery voltage reaches the trickle charge voltage, the trickle charge can be performed on the battery, so as to set an equalization time for an equalization circuit of the battery management system, and finally, the lithium battery is fully charged.
In embodiments of the present invention, the trickle charge may be performed at a current of 0.05C. Optionally, in an embodiment, in step 204, the trickle charging the battery with the third charging current includes: and charging the battery for a preset time period at preset time intervals by using a third charging current.
In this embodiment, the trickle charge is performed by cycling for a plurality of times at preset time intervals and preset trickle charge durations, for example, the battery may be charged for 5 minutes at 0.05C current every 15 minutes, and thus cycled for a plurality of times.
Optionally, in an embodiment, in step 204, stopping charging the battery when the trickle charging meets the preset condition may include:
stopping charging the battery when the specified trickle charge times are reached; wherein, the trickle charge of the battery for a preset time period with the third charging current is regarded as a trickle charge frequency.
In this embodiment, after trickle-charging is performed multiple times, the battery will enter a sleep mode, i.e., no battery charging is performed at this time. The reason is that the battery voltage at the tail end of the lithium battery is unbalanced, and if the battery is charged uniformly for a long time by hanging the charging voltage of 3.52V, the battery is charged inevitably, so that the battery is unbalanced. When the battery goes to sleep, the battery is awakened to be recharged by judging whether the battery capacity/battery voltage/sleep time and the like are detected because the battery self-discharge and the battery management system are all capable of consuming the battery electric quantity.
From the above, the invention monitors the battery voltage; when the voltage of the battery is not less than the lowest charging voltage of the battery and not more than the preset highest pre-charging voltage, pre-charging the battery in a first charging mode; when the voltage of the battery is larger than the pre-charging highest voltage and not larger than the preset constant-current charging highest voltage, the battery is subjected to constant-current charging in a second charging mode; and when the voltage of the battery is larger than the highest constant-current charging voltage and is not larger than the preset trickle charging voltage, performing constant-voltage post-charging on the battery in a third charging mode. The charging stages corresponding to the first charging mode and the third charging mode represent charging stages in which the pressure difference of each lithium battery monomer is larger than the specified pressure difference, the charging stages corresponding to the second charging mode represent charging stages in which the pressure difference of each lithium battery monomer is not larger than the specified pressure difference, and the batteries are charged in different charging stages by controlling different charging currents, so that the influence of the overlarge pressure difference of each lithium battery monomer on the service lives of the batteries is reduced, intelligent charging management of the lithium batteries is realized, the lithium batteries are enabled to work more stably, and the service life of the lithium batteries is longer.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The following are device embodiments of the invention, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 3 is a schematic structural diagram of a battery charging control device according to an embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment of the present invention are shown, which are described in detail below:
as shown in fig. 3, the battery includes two or more lithium battery cells connected in series, and the battery charging control device 3 includes: a battery voltage monitoring unit 31, a pre-charging unit 32, a constant current charging unit 33 and a post-charging unit 34.
A battery voltage monitoring unit 31 for monitoring a battery voltage;
a precharge unit 32 for precharging the battery in the first charge mode when the battery voltage monitoring unit 31 monitors that the battery voltage is not greater than a preset precharge maximum voltage;
a constant current charging unit 33, configured to perform constant current charging on the battery in the second charging mode when the battery voltage monitoring unit 31 monitors that the battery voltage is greater than the pre-charging maximum voltage and not greater than a preset constant current charging maximum voltage;
A post-charging unit 34, configured to perform post-charging on the battery in a third charging mode when the battery voltage monitoring unit 31 monitors that the battery voltage is greater than the constant current charging highest voltage;
the first charging mode, the second charging mode and the third charging mode are all charging modes for charging the battery by controlling charging current, and the charging currents controlled in different charging modes are different;
the minimum charging voltage, the precharge highest voltage, the constant current charging highest voltage and the trickle charging voltage are sequentially increased; the charging phases corresponding to the first charging mode and the third charging mode represent charging phases in which the pressure difference of each lithium battery cell is larger than a specified pressure difference, and the charging phases corresponding to the second charging mode represent charging phases in which the pressure difference of each lithium battery cell is not larger than the specified pressure difference.
Alternatively, the precharge unit 32 may include a constant current precharge subunit and a variable current precharge subunit;
the constant-current pre-charging subunit is used for carrying out constant-current pre-charging on the battery by using a first charging current when the battery voltage is not greater than a preset first pre-charging voltage;
The variable-current pre-charging subunit is configured to perform variable-current pre-charging on the battery with a first variable charging current when the battery voltage is not less than the first pre-charging voltage and not greater than the pre-charging highest voltage, where the magnitude of the first variable charging current is positively related to the battery voltage, the minimum value of the first variable charging current is the first charging current, and the first charging current is numerically smaller than the nominal capacity of the battery.
Optionally, the constant current charging unit 33 is specifically configured to perform constant current charging on the battery with a second charging current, where the second charging current is not smaller in value than the nominal capacity of the battery.
Optionally, the post-charging unit 34 includes a variable current post-charging subunit and a constant current post-charging subunit;
the variable-current later-stage charging subunit is used for carrying out variable-current later-stage charging on the battery by using a second variable charging current when the battery voltage is larger than the highest constant-current charging voltage and is not larger than a preset first later-stage charging voltage;
the constant-current later-stage charging subunit is used for carrying out constant-current later-stage charging on the battery by using a third charging current when the battery voltage is larger than the first later-stage charging voltage and not larger than a preset trickle charging voltage;
Wherein the magnitude of the second varying charging current is inversely related to the battery voltage, and the minimum value of the second varying charging current is the third charging current.
Optionally, the post-charging unit 34 may further include a trickle charging subunit, configured to trickle charge the battery with a third charging current when the battery voltage is not less than the trickle charging voltage, and stop charging the battery when the trickle charging meets a preset condition.
Optionally, the trickle charging subunit is specifically configured to perform trickle charging on the battery for a preset duration with a third charging current at preset time intervals when the battery voltage is not less than the trickle charging voltage.
Optionally, the trickle charging subunit is specifically further configured to stop charging the battery when a specified trickle charging frequency is reached; wherein, the trickle charge of the battery for a preset time period with the third charging current is regarded as a trickle charge frequency.
From the above, the invention monitors the battery voltage; when the voltage of the battery is not less than the lowest charging voltage of the battery and not more than the preset highest pre-charging voltage, pre-charging the battery in a first charging mode; when the voltage of the battery is larger than the pre-charging highest voltage and not larger than the preset constant-current charging highest voltage, the battery is subjected to constant-current charging in a second charging mode; and when the voltage of the battery is larger than the highest constant-current charging voltage and is not larger than the preset trickle charging voltage, performing constant-voltage post-charging on the battery in a third charging mode. The charging stages corresponding to the first charging mode and the third charging mode represent charging stages in which the pressure difference of each lithium battery monomer is larger than the specified pressure difference, the charging stages corresponding to the second charging mode represent charging stages in which the pressure difference of each lithium battery monomer is not larger than the specified pressure difference, and the batteries are charged in different charging stages by controlling different charging currents, so that the influence of the overlarge pressure difference of each lithium battery monomer on the service lives of the batteries is reduced, intelligent charging management of the lithium batteries is realized, the lithium batteries are enabled to work more stably, and the service life of the lithium batteries is longer.
Fig. 4 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 4, the terminal 4 of this embodiment includes: a processor 40, a memory 41 and a computer program 42 stored in the memory 41 and executable on the processor 40. The processor 40, when executing the computer program 42, implements the steps of the above-described embodiments of the control method for charging the respective batteries, such as steps 201 to 204 shown in fig. 2. Alternatively, the processor 40, when executing the computer program 42, performs the functions of the units in the above-described device embodiments, such as the functions of the units 31 to 34 shown in fig. 3.
Illustratively, the computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used for describing the execution of the computer program 42 in the terminal 4. For example, the computer program 42 may be divided into a battery voltage monitoring unit, a pre-charging unit, a constant current charging unit and a post-charging unit, each of which functions as follows:
A battery voltage monitoring unit for monitoring a battery voltage;
the battery voltage monitoring unit is used for monitoring the voltage of the battery to be not more than a preset maximum voltage for pre-charging;
the constant-current charging unit is used for carrying out constant-current charging on the battery in a second charging mode when the battery voltage monitoring unit monitors that the battery voltage is greater than the pre-charging highest voltage and not greater than the preset constant-current charging highest voltage;
and the later-stage charging unit is used for carrying out the later-stage charging on the battery in a third charging mode when the battery voltage monitoring unit monitors that the battery voltage is greater than the highest constant-current charging voltage.
The terminal 4 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal may include, but is not limited to, a processor 40, a memory 41. It will be appreciated by those skilled in the art that fig. 4 is merely an example of the terminal 4 and is not limiting of the terminal 4, and may include more or fewer components than shown, or may combine some components, or different components, e.g., the terminal may further include input and output devices, network access devices, buses, etc.
The processor 40 may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the terminal 4, such as a hard disk or a memory of the terminal 4. The memory 41 may also be an external storage device of the terminal 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the terminal 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the terminal 4. The memory 41 is used for storing the computer program as well as other programs and data required by the terminal. The memory 41 may also be used for temporarily storing data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the apparatus/terminal embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown 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 units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (9)
1. A control method of battery charging, wherein the battery includes two or more lithium battery cells connected in series, the control method comprising:
monitoring a battery voltage;
when the voltage of the battery is not more than the preset highest voltage for pre-charging, pre-charging the battery in a first charging mode; stopping charging the battery when the battery voltage is lower than a preset minimum charging voltage;
when the battery voltage is larger than the pre-charging highest voltage and not larger than the preset constant-current charging highest voltage, carrying out constant-current charging on the battery in a second charging mode;
when the battery voltage is greater than the highest constant current charging voltage, the battery is charged in a third charging mode in a later period;
The first charging mode, the second charging mode and the third charging mode are all charging modes for charging the battery by controlling charging current, and the charging currents controlled in different charging modes are different;
wherein the precharge maximum voltage is less than the constant current charge maximum voltage; the charging phases corresponding to the first charging mode and the third charging mode represent charging phases in which the pressure difference of each lithium battery cell is larger than a specified pressure difference, and the charging phases corresponding to the second charging mode represent charging phases in which the pressure difference of each lithium battery cell is not larger than the specified pressure difference;
and when the battery voltage is greater than the highest constant current charging voltage, performing the post-charging on the battery in the third charging mode comprises:
when the battery voltage is larger than the highest constant current charging voltage and is not larger than a preset first later charging voltage, carrying out variable current later charging on the battery by using a second variable charging current;
when the battery voltage is larger than the first later charging voltage and not larger than the preset trickle charging voltage, carrying out constant-current later charging on the battery by using a third charging current;
the magnitude of the second variable charging current is inversely related to the battery voltage, the minimum value of the second variable charging current is the third charging current, and the second variable charging current is the gradually decreasing charging current.
2. The method of claim 1, wherein the pre-charging the battery in the first charging mode when the battery voltage is not greater than a preset pre-charge maximum voltage comprises:
when the voltage of the battery is not greater than a preset first pre-charging voltage, carrying out constant-current pre-charging on the battery by using a first charging current;
and when the battery voltage is not less than the first pre-charging voltage and not more than the pre-charging highest voltage, carrying out variable-current pre-charging on the battery by using a first variable charging current, wherein the magnitude of the first variable charging current is positively related to the battery voltage, the minimum value of the first variable charging current is the first charging current, and the first charging current is smaller than the nominal capacity of the battery in value.
3. The method of controlling battery charging according to claim 1, wherein the constant current charging of the battery in the second charging mode comprises:
the battery is charged with a constant current at a second charging current that is not less in value than the nominal capacity of the battery.
4. The method of claim 1, wherein the post-charging the battery in the third charging mode when the battery voltage is greater than the constant current charging maximum voltage further comprises:
And when the voltage of the battery is not smaller than the trickle charge voltage, trickle charging the battery by a third charge current, and stopping charging the battery when the trickle charge meets the preset condition.
5. The method of claim 4, wherein trickle charging the battery with the third charging current comprises:
and charging the battery for a preset time period at preset time intervals by using a third charging current.
6. The method of claim 5, wherein stopping charging the battery when the trickle charge meets a predetermined condition comprises:
stopping charging the battery when the specified trickle charge times are reached; wherein, the trickle charge of the battery for a preset time period with the third charging current is regarded as a trickle charge frequency.
7. A control device for charging a battery, wherein the battery comprises two or more lithium battery cells connected in series, the control device comprising:
a battery voltage monitoring unit for monitoring a battery voltage;
the battery voltage monitoring unit is used for monitoring the voltage of the battery to be not more than a preset maximum voltage for pre-charging; stopping charging the battery when the battery voltage is lower than a preset minimum charging voltage;
The constant-current charging unit is used for carrying out constant-current charging on the battery in a second charging mode when the battery voltage monitoring unit monitors that the battery voltage is greater than the pre-charging highest voltage and not greater than the preset constant-current charging highest voltage;
the battery voltage monitoring unit is used for monitoring the voltage of the battery to be higher than the constant current charging highest voltage, and the battery is charged in a first charging mode;
the first charging mode, the second charging mode and the third charging mode are all charging modes for charging the battery by controlling charging current, and the charging currents controlled in different charging modes are different;
the minimum charging voltage, the maximum precharge voltage, the maximum constant current charging voltage and the trickle charging voltage are sequentially increased; the charging phases corresponding to the first charging mode and the third charging mode represent charging phases in which the pressure difference of each lithium battery cell is larger than a specified pressure difference, and the charging phases corresponding to the second charging mode represent charging phases in which the pressure difference of each lithium battery cell is not larger than the specified pressure difference;
the post-charging unit comprises a variable current post-charging subunit and a constant current post-charging subunit;
The variable-current later-stage charging subunit is used for carrying out variable-current later-stage charging on the battery by using a second variable charging current when the battery voltage is larger than the highest constant-current charging voltage and is not larger than a preset first later-stage charging voltage;
the constant-current later-stage charging subunit is used for carrying out constant-current later-stage charging on the battery by using a third charging current when the battery voltage is larger than the first later-stage charging voltage and not larger than a preset trickle charging voltage;
the magnitude of the second variable charging current is inversely related to the battery voltage, the minimum value of the second variable charging current is the third charging current, and the second variable charging current is the gradually decreasing charging current.
8. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method for controlling the charging of a battery according to any of the preceding claims 1 to 6.
9. A computer-readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of controlling battery charging according to any one of claims 1 to 6.
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| CN113452122A (en) * | 2021-07-22 | 2021-09-28 | 中国电力科学研究院有限公司 | Lithium iron phosphate battery direct-current power supply balancing system, method and equipment for transformer substation |
| CN113746168A (en) * | 2021-08-27 | 2021-12-03 | 江苏科曜能源科技有限公司 | Charging and discharging method, device, equipment and storage medium of lead-acid battery |
| CN113966881A (en) * | 2021-09-08 | 2022-01-25 | 深圳麦时科技有限公司 | Aerosol generating device, control method, and computer-readable storage medium |
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