CN115051446A - Charging and discharging control method, control equipment and power supply system - Google Patents
Charging and discharging control method, control equipment and power supply system Download PDFInfo
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- CN115051446A CN115051446A CN202210867405.XA CN202210867405A CN115051446A CN 115051446 A CN115051446 A CN 115051446A CN 202210867405 A CN202210867405 A CN 202210867405A CN 115051446 A CN115051446 A CN 115051446A
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
- 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
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a charge and discharge control method, control equipment and a power supply system, wherein the control method is used for controlling charge and discharge of a battery module, the battery module comprises a plurality of batteries connected in parallel, and the charge and discharge control method comprises the following steps: acquiring the residual electric quantity of a plurality of batteries in a charging mode; estimating whether a battery with charging current larger than preset charging current exists when the plurality of batteries are charged together according to the corresponding relation between the residual electric quantity of the plurality of batteries and the preset electric quantity interval; if yes, controlling the battery to be charged independently; if not, controlling the multiple batteries to be charged together, so that the charging current of all the batteries is less than or equal to the preset charging current when the multiple batteries are charged together, and the service life of the batteries is prevented from being influenced by overlarge charging current of the batteries.
Description
Technical Field
The invention relates to the technical field of battery charging and discharging, in particular to a charging and discharging control method, control equipment and a power supply system.
Background
Along with the improvement of the demand of people for the capacity of the battery, the parallel capacity expansion technology of the battery is gradually applied to various battery modules. However, under the influence of factors such as manufacturing process differences, the internal resistances of the batteries connected in parallel in the battery module are different, so that the charging currents of the batteries are different, and when a plurality of batteries in the battery module are charged together, the charging currents of some batteries are too large and even exceed the charging specifications, so that the service life of the batteries is influenced.
Disclosure of Invention
In view of the above, the present invention is directed to a charging and discharging control method, a control device and a power supply system to avoid excessive charging current of some batteries when a plurality of batteries connected in parallel are charged together.
In a first aspect, the present invention provides a charge and discharge control method for controlling charge and discharge of a battery module, where the battery module includes a plurality of batteries connected in parallel, the charge and discharge control method includes:
acquiring the residual electric quantity of the plurality of batteries in a charging mode;
estimating whether a battery with a charging current larger than a preset charging current exists when the plurality of batteries are charged together according to the corresponding relation between the residual electric quantity of the plurality of batteries and a preset electric quantity interval;
if yes, controlling the battery to be charged independently;
and if not, controlling the plurality of batteries to be charged together.
Optionally, the electric quantity section includes a lowest electric quantity section and a maximum difference electric quantity section, and estimating, according to a correspondence between remaining electric quantities of the plurality of batteries and a preset electric quantity section, whether a battery with a charging current greater than a preset charging current exists when the plurality of batteries are charged together includes:
judging whether the residual electric quantity of the plurality of batteries is within the lowest electric quantity interval or not, and judging whether the difference value of the residual electric quantity of any two batteries in the plurality of batteries is within the maximum difference electric quantity interval or not;
if the residual electric quantity of at least one battery is within the lowest electric quantity interval, estimating that the charging current of at least one battery is larger than a preset charging current when the plurality of batteries are charged together;
if the difference value of the residual electric quantity of at least two batteries is within the maximum difference electric quantity interval, estimating that the charging current of at least one battery is larger than the preset charging current when the batteries are charged together;
and if the residual electric quantity of the batteries is not in the lowest electric quantity interval and the difference value of the residual electric quantity of any two batteries in the batteries is not in the maximum difference electric quantity interval, estimating that the batteries with the charging current larger than the preset charging current do not exist when the batteries are charged together.
Optionally, the determining whether the remaining power of the plurality of batteries is within the lowest power interval includes: judging whether the residual electric quantity of the battery with the minimum rated capacity in the plurality of batteries is in the lowest electric quantity interval or not; if so, the residual electric quantity of at least one battery is in the lowest electric quantity interval; if not, the residual electric quantity of the plurality of batteries is not in the lowest electric quantity interval;
the judging whether the difference value of the remaining electric quantities of any two batteries in the plurality of batteries is within the maximum difference electric quantity interval comprises: judging whether the difference value between the residual electric quantity of the battery with the minimum rated capacity and other batteries in the plurality of batteries is within the maximum difference electric quantity interval or not; if so, the difference value of the residual electric quantity of the at least two batteries is within the maximum difference electric quantity interval; and if not, the difference value of the residual electric quantity of any two batteries in the plurality of batteries is not within the maximum difference electric quantity interval.
Optionally, the controlling the battery to charge alone comprises: controlling the battery to be independently charged with a charging current matched with the battery, wherein the charging current matched with the battery is less than or equal to the preset charging current;
the controlling the plurality of batteries to be charged together includes: controlling the plurality of batteries to be charged together with the charging current matched with the battery module; and the charging current matched with the battery module is equal to the sum of the charging currents matched with the batteries.
Optionally, the lowest power interval includes: an interval less than or equal to 5%; the maximum difference electric quantity interval comprises: an interval greater than or equal to 30%.
Optionally, the method further comprises:
determining a plurality of power thresholds and a plurality of residual electric quantity intervals respectively corresponding to the power thresholds according to the maximum discharge power of each battery in the battery module, wherein the power thresholds are sequentially increased;
in a discharging mode, acquiring the residual electric quantity of the battery module, and judging whether the residual electric quantity of the battery module is within the plurality of residual electric quantity intervals;
and if the residual capacity of the battery module is within the residual capacity interval, controlling the maximum load power of the battery module not to exceed a power threshold corresponding to the residual capacity interval so as to enable the discharge current of each battery in the battery module to be smaller than a preset discharge current.
Optionally, the method further comprises:
and if the maximum load power of the battery module exceeds the corresponding power threshold, controlling the battery module to enter a protection state.
Optionally, a maximum power threshold of the plurality of power thresholds is equal to a sum of maximum discharge powers of the batteries in the battery module; a minimum power threshold of the plurality of power thresholds is equal to a minimum of maximum discharge powers of the plurality of batteries.
Optionally, the battery module includes a first battery and a second battery, and then the plurality of power thresholds include a first power threshold, a second power threshold and a third power threshold, where the first power threshold is equal to a sum of a maximum discharge power of the first battery and a maximum discharge power of the second battery, the second power threshold is equal to a maximum discharge power of the first battery, the third power threshold is equal to a maximum discharge power of the second battery, and the maximum discharge power of the first battery is greater than the maximum discharge power of the second battery;
the remaining capacity interval corresponding to the first power threshold includes: the interval is larger than the lower limit of the residual electric quantity corresponding to the first power threshold; the remaining capacity interval corresponding to the second power threshold includes: a section which is greater than or equal to the lower limit of the remaining power corresponding to the first power threshold and is less than or equal to the lower limit of the remaining power corresponding to the second power threshold; the remaining capacity section corresponding to the third power threshold includes: and the interval is larger than the lower limit of the residual capacity corresponding to the second power threshold.
Optionally, the lower limit of the remaining power corresponding to the first power threshold is 40%, and the lower limit of the remaining power corresponding to the second power threshold is 20%.
In a second aspect, the present invention provides a charge and discharge control apparatus comprising:
a memory to store instructions;
and the controller is used for executing the charging and discharging control method according to the instructions stored in the memory.
In a third aspect, the present invention provides a power supply system, which includes a battery module and the above charge and discharge control device, where the charge and discharge control device is connected to the battery module, and the charge and discharge control device is used to control charge and discharge of the battery module.
According to the charge and discharge control method, the control equipment and the power supply system, the residual electric quantity of the batteries is obtained in a charge mode, whether the batteries with the charging current larger than the preset charging current exist when the batteries are charged together is estimated according to the corresponding relation between the residual electric quantity of the batteries and the preset electric quantity interval, if not, the batteries are charged together, if so, the batteries are charged separately, and the batteries are charged together until the estimated result shows that the batteries with the charging current larger than the preset charging current do not exist, so that the charging current of all the batteries is smaller than or equal to the preset charging current when the batteries are charged together, and the service life of the batteries is prevented from being influenced by the overlarge charging current of the batteries.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
Fig. 1 is a schematic diagram illustrating a connection relationship of a battery module according to an embodiment of the present invention.
Fig. 2 is a flowchart of a charging and discharging control method according to an embodiment of the present invention.
Fig. 3 is a flowchart of a charging and discharging control method according to another embodiment of the present invention.
Fig. 4 is a graph of charging parameters of the battery 1 and the battery 2 in each charging phase according to an embodiment of the present invention.
Fig. 5 is a flowchart of a charging and discharging control method according to another embodiment of the present invention.
Fig. 6 is a graph of the charging parameters of the battery 1 and the battery 2 at each discharging stage according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a charge and discharge control method, which is used for controlling charge and discharge of a battery module. As shown in fig. 1, fig. 1 is a schematic diagram illustrating a connection relationship of a battery module according to an embodiment of the present invention, in which the battery module 10 is connected to a power adapter 11 and a host 12 respectively. The battery module 10 includes a plurality of batteries, i.e., a battery 1 to a battery n, connected in parallel, n being a natural number greater than or equal to 2. The host 12 is connected with the batteries through a plurality of switches respectively, namely a switch K1 is connected with the battery 1, a switch K2 is connected with the battery 2, … and a switch Kn is connected with the battery n, and the host 12 controls the charging and discharging of the battery module 10 by controlling the on-off of the switch.
The operation mode of the battery module 10 includes a charging mode and a discharging mode. In the charging mode, the power adapter 11 outputs current to the battery module 10 to charge the battery module 10; during the charging process, the host 12 controls the charging and discharging strategy of the battery module 10, for example, controls whether each battery is charged together according to the remaining capacity of each battery. In the discharging mode, the battery module 10 outputs current to the host 12 to supply power to the host 12.
It should be noted that fig. 1 illustrates a connection relationship of battery modules in a notebook computer, and the present invention is only described by way of example and is not limited thereto. In the embodiment of the present invention, the battery in the battery module 10 may be a lead-acid battery, or a lithium battery. In addition, each battery in the embodiment of the present invention may include one battery cell, or may include a plurality of battery cells connected in series.
As shown in fig. 2, fig. 2 is a flowchart of a charging and discharging control method according to an embodiment of the present invention, where the charging and discharging control method may be applied to the host 12, and the charging and discharging control method includes:
s201: acquiring the residual electric quantity of a plurality of batteries in a charging mode;
s202: estimating whether a battery with charging current larger than preset charging current exists when the plurality of batteries are charged together according to the corresponding relation between the residual electric quantity of the plurality of batteries and the preset electric quantity interval; if yes, entering S203; if not, entering S204;
s203: controlling the batteries to be charged independently;
s204: and controlling the plurality of batteries to be charged together.
The preset charging current may be a maximum charging current that satisfies a battery charging specification. The electric quantity interval is a residual electric quantity interval which enables the charging current of the battery to be larger than the preset charging current. The battery can be charged independently by controlling the switch corresponding to the battery to be switched on and the other switches to be switched off, and the plurality of batteries can be charged together by controlling all the switches to be switched on.
After the residual electric quantity of the batteries is obtained in the charging mode, whether the batteries with the charging current larger than the preset charging current exist in the process of jointly charging the batteries is estimated according to the corresponding relation between the residual electric quantity of the batteries and the preset electric quantity interval, if not, the batteries are jointly charged, if so, the batteries are independently charged, and the batteries are jointly charged until the estimated result is that the batteries with the charging current larger than the preset charging current do not exist, so that the charging current of all the batteries is smaller than or equal to the preset charging current when the batteries are jointly charged, and the service life of the batteries is prevented from being influenced due to the fact that the charging current of the batteries is too large.
In some embodiments of the present invention, the electric quantity section includes a minimum electric quantity section and a maximum difference electric quantity section, as shown in fig. 3, fig. 3 is a flowchart of a charge and discharge control method according to another embodiment of the present invention, where the charge and discharge control method includes:
s301: acquiring the residual electric quantity of a plurality of batteries in a charging mode;
s302: judging whether the residual electric quantity of the plurality of batteries is in the lowest electric quantity interval or not, and judging whether the difference value of the residual electric quantity of any two batteries in the plurality of batteries is in the maximum difference electric quantity interval or not;
s303: if the residual electric quantity of at least one battery is in the lowest electric quantity interval, estimating that the charging current of at least one battery is larger than the preset charging current when the plurality of batteries are charged together;
s304: if the difference value of the residual electric quantity of at least two batteries is within the maximum difference electric quantity interval, estimating that the charging current of at least one battery is larger than the preset charging current when the batteries are charged together;
s305: if the residual electric quantity of the batteries is not in the lowest electric quantity interval and the difference value of the residual electric quantity of any two batteries in the batteries is not in the maximum difference electric quantity interval, the batteries with the charging current larger than the preset charging current are not existed when the batteries are charged together.
In the embodiment of the invention, in the charging mode, the residual electric quantity of each battery in the battery module is obtained, and whether the charging mode of the battery module is the charging management mode or the battery management mode is determined according to whether the residual electric quantity of each battery is in a preset electric quantity interval. In the charge management mode, the batteries in the battery module are charged together, and in the battery management mode, part of the batteries in the battery module are charged individually.
If the charging current of at least one battery is larger than the preset charging current when the plurality of batteries are estimated to be charged together, entering a battery management mode, and controlling the battery with the estimated charging current larger than the preset charging current to be charged independently until the independent charging of the battery is finished after the residual electric quantity of the battery is not in the lowest electric quantity interval; and estimating that the charging current of the battery with the minimum residual electric quantity is larger than the preset charging current in the two batteries with the maximum difference electric quantity intervals.
And if the residual electric quantity of the plurality of batteries is not in the lowest electric quantity interval and the difference value of the residual electric quantity of any two batteries in the plurality of batteries is not in the maximum difference electric quantity interval, entering a charging management mode and controlling the plurality of batteries to be charged together.
It should be noted that, during the charging process of the battery module, the remaining power of the plurality of batteries in the battery module is continuously obtained, and the charging strategy is adjusted in real time according to the remaining power, for example, whether the charging is performed individually or jointly is adjusted in real time.
In the embodiment of the invention, when the battery is charged independently, the charging current within the charging specification, such as the charging current smaller than the preset charging current, can be adopted, so that the problem that the service life of the battery is influenced due to the overlarge charging current can be avoided. When a plurality of batteries are charged together, because the residual capacity of each battery is greater than the electric quantity in the lowest electric quantity interval, therefore, the situation that the residual capacity of the battery is too small and the charging current of the battery is overlarge is caused can be avoided, because the difference of the residual capacities of any two batteries is less than the electric quantity in the maximum difference electric quantity interval, therefore, the situation that the charging current of the battery with the minimum residual capacity is overlarge caused by the overlarge residual capacity difference of the two batteries can be avoided, so that the charging current of each battery is more balanced, the problem that the service life of the battery is influenced by the overlarge charging current of some batteries is avoided, and the problem that the charging time of the battery is longer and the charging efficiency of a battery module is influenced due to the overlarge charging current of some batteries is avoided. On the basis, the internal resistance difference among the batteries can be ignored, and the assembly requirement of the battery module is reduced.
In some embodiments of the present invention, determining whether the remaining power of the plurality of batteries is within the lowest power interval includes: judging whether the residual electric quantity of the battery with the minimum rated capacity in the plurality of batteries is in the lowest electric quantity interval or not; if so, the residual electric quantity of at least one battery is in the lowest electric quantity interval; if not, the residual electric quantity of the batteries is not in the lowest electric quantity interval.
Judging whether the difference value of the residual electric quantities of any two batteries in the plurality of batteries is within the maximum difference electric quantity interval comprises the following steps: judging whether the difference value between the battery with the minimum rated capacity and the residual electric quantity of other batteries in the plurality of batteries is within the maximum difference electric quantity interval or not; if so, the difference value of the residual electric quantity of the at least two batteries is within the maximum difference electric quantity interval; if not, the difference value of the residual electric quantity of any two batteries in the plurality of batteries is not within the maximum difference electric quantity interval.
Since the rated power of the plurality of batteries is different and the remaining power is increased as the rated power of the battery is increased, the remaining power of the other batteries can be determined by determining the remaining power of the battery with the minimum rated power. That is, if the remaining capacity of the battery with the smallest rated capacity is within the lowest capacity interval, the remaining capacity of at least one of the plurality of batteries is within the lowest capacity interval, and if none of the remaining capacities of the batteries with the smallest rated capacity is within the lowest capacity interval, the remaining capacities of the other batteries are inevitably not within the lowest capacity interval. If the difference between the residual capacities of the battery with the minimum rated capacity and the other batteries is within the maximum difference electric quantity interval, the difference between the residual capacities of at least two batteries in the plurality of batteries is within the maximum difference electric quantity interval, and if the difference between the residual capacities of the battery with the minimum rated capacity and the other batteries is not within the maximum difference electric quantity interval, the difference between the residual capacities of the other batteries is inevitably not within the maximum difference electric quantity interval. Based on this, the comparison frequency of the residual battery capacity can be reduced, and the operation efficiency is improved.
In some embodiments of the invention, controlling the individual charging of the batteries comprises: and controlling the battery to be independently charged with the matched charging current, wherein the matched charging current is less than the preset charging current. Optionally, the charging current matched with the charging current is a maximum current smaller than a preset charging current range, so as to realize quick charging of the battery. Controlling the plurality of batteries to be charged together includes: controlling the plurality of batteries to be charged together with the charging current matched with the battery module; the charging current matched with the battery module is equal to the sum of the charging currents matched with the batteries.
In some embodiments of the present invention, the lowest power interval includes: an interval less than or equal to 5%; the maximum difference electric quantity interval comprises: an interval greater than or equal to 30%. Of course, the present invention is not limited thereto, and the threshold of each electric quantity interval may be set according to the actual parameters of the battery, which is not described herein again.
The battery module will be described by taking a battery 1 and a battery 2 as an example. Wherein the rated capacity of the battery 1 is smaller than that of the battery 2. After acquiring the residual capacities of the battery 1 and the battery 2 in the charging mode, judging whether the residual capacity of the battery 1 is less than 5%; if the residual capacity of the battery 1 is less than 5%, entering a battery management mode, and controlling the battery 1 to be charged independently until the residual capacity of the battery 1 is greater than or equal to 5%; if the difference value is larger than or equal to 5 percent, judging whether the difference value between the battery 1 and the battery 2 is larger than 30 percent; if the charging rate is less than or equal to 30%, entering a charging management mode, controlling the battery 1 and the battery 2 to be charged together until the battery 1 and the battery 2 are charged to 100%, and ending the charging; if the difference value is greater than 30%, controlling the battery 1 to charge independently until the difference value between the battery 1 and the battery 2 is less than or equal to 30%, entering a charging management mode, controlling the battery 1 and the battery 2 to charge together until the battery 1 and the battery 2 are both charged to 100%, and ending the charging.
TABLE 1
Table 1 shows test data of the charging process of the battery 1 and the battery 2, where at the beginning of charging, the remaining capacity of the battery 1 is 8% and the remaining capacity of the battery 2 is 3%, the battery 2 is rapidly charged by the matching current of the battery 2 alone, and then the battery 1 and the battery 2 are charged together. During the whole charging process, the monitoring data are shown in table 1, and the charging current meets the specification requirements of each battery. As shown in fig. 4, fig. 4 is a charging parameter graph of the battery 1 and the battery 2 in each charging phase according to an embodiment of the present invention, in which the charging current of the battery 1 and the charging current of the battery 2 are within the respective charging specifications during the charging process, and the charging time is greatly shortened.
It should be noted that, in some embodiments of the present invention, the remaining capacity of the battery is represented by SOC (State of Charge), wherein the SOC value is generally expressed by a percentage. Of course, in other embodiments, other parameters may also be used to represent the remaining power, which are not described herein again.
On the basis of any one of the embodiments, as shown in fig. 5, fig. 5 is a flowchart of a charging and discharging control method according to another embodiment of the present invention, where the charging and discharging control method further includes:
s501: determining a plurality of power thresholds and a plurality of residual electric quantity intervals respectively corresponding to the power thresholds according to the maximum discharge power of each battery in the battery module, wherein the power thresholds are sequentially increased;
s502: in the discharging mode, acquiring the residual electric quantity of the battery module, and judging whether the residual electric quantity of the battery module is within a plurality of residual electric quantity intervals;
s503: and if the residual electric quantity of the battery module is within a residual electric quantity interval, controlling the maximum load power of the battery module to be smaller than or equal to a power threshold corresponding to the residual electric quantity interval so as to enable the discharge current of each battery in the battery module to be smaller than the preset discharge current.
Wherein the preset discharge current is a maximum discharge current within the discharge specification of the battery. On the basis, if the maximum load power of the battery module does not exceed the corresponding power threshold, the battery module is in a normal working state; and if the maximum load power of the battery module exceeds the corresponding power threshold, controlling the battery module to enter a protection state.
In some embodiments of the present invention, the maximum power threshold of the plurality of power thresholds is equal to the sum of the maximum discharge powers of the batteries in the battery module; the smallest of the plurality of power thresholds is equal to the smallest of the maximum discharge powers of the plurality of batteries.
On this basis, in some embodiments of the present invention, the battery module includes a first battery (e.g., battery 1) and a second battery (e.g., battery 2), and the plurality of power thresholds includes a first power threshold, a second power threshold and a third power threshold, wherein the first power threshold is equal to the sum of the maximum discharge power of the first battery and the maximum discharge power of the second battery, the second power threshold is equal to the maximum discharge power of the first battery, the third power threshold is equal to the maximum discharge power of the second battery, and the maximum discharge power of the first battery is greater than the maximum discharge power of the second battery;
the remaining capacity section corresponding to the first power threshold includes: the interval is larger than the lower limit of the residual electric quantity corresponding to the first power threshold; the remaining capacity section corresponding to the second power threshold includes: the interval is larger than or equal to the lower limit of the residual electric quantity corresponding to the first power threshold and smaller than or equal to the lower limit of the residual electric quantity corresponding to the second power threshold; the remaining capacity section corresponding to the third power threshold includes: and the interval is larger than the lower limit of the residual electric quantity corresponding to the second power threshold.
That is, if the remaining capacity of the battery module is within the interval greater than the lower limit of the remaining capacity corresponding to the first power threshold, controlling the maximum load power of the battery module to be less than or equal to the first power threshold; if the residual capacity of the battery module is in the interval which is larger than or equal to the lower limit of the residual capacity corresponding to the first power threshold and smaller than or equal to the lower limit of the residual capacity corresponding to the second power threshold, controlling the maximum load power of the battery module to be smaller than or equal to the second power threshold; and if the residual capacity of the battery module is in the interval larger than the lower limit of the residual capacity corresponding to the second power threshold, controlling the maximum load power of the battery module to be smaller than or equal to a third power threshold.
On this basis, in some embodiments of the present invention, the lower limit of the remaining power corresponding to the first power threshold is 40%, and the lower limit of the remaining power corresponding to the second power threshold is 20%. Of course, the present invention is not limited thereto, and each power threshold may be set according to the actual parameters of the battery module, which is not described herein again.
TABLE 2
Table 2 shows the test data of the discharge process of battery 1 and battery 2, wherein the maximum discharge power of battery 1 is 33.12W and the maximum discharge power of battery 2 is 54W. The battery 1 and the battery 2 are discharged from the residual capacity of 100% at the constant power of 87.12W with the first threshold value, to the residual capacity of 40%, at the constant power of 54W with the second threshold value, to the residual capacity of 20%, and at the constant power of 33.12W with the third threshold value, to the residual capacity of 0%. As shown in fig. 6, fig. 6 is a charging parameter curve graph of the battery 1 and the battery 2 at each discharging stage according to an embodiment of the present invention, and an SOC curve graph is obtained by discharging at each discharging stage with a set power threshold. During the discharging process, the battery 1 and the battery 2 are within the discharging specification of the batteries, and similar SOC curves are obtained, so that the optimal performance is provided for the system.
It should be noted that, during the discharging process, the remaining capacity of the battery module is continuously obtained, and the maximum load power of the battery module is adjusted in real time according to the corresponding relationship between the remaining capacity of the battery module and the predetermined plurality of remaining capacity intervals.
Based on this, through a plurality of stages that the residual capacity of the battery module is different, set up the power threshold value that corresponds with the residual capacity interval, and make the maximum load power of battery module be less than the power threshold value that corresponds, can make each battery balanced discharge, make the discharge curve of each battery similar, make the residual capacity of each battery reach 0 simultaneously, and do not exceed respective discharge specification in the discharge process, and then can avoid a certain battery to transship or overdischarge, avoid the residual capacity of two batteries to differ too greatly and lead to that one of them battery charges for another battery. On this basis, the difference between the batteries can be ignored, and the assembly requirement of the battery module 10 can be reduced.
An embodiment of the present invention further provides a charge and discharge control device, including:
a memory to store instructions;
and the controller is used for executing the charging and discharging control method according to the instructions stored in the memory.
The embodiment of the invention also provides a power supply system which comprises a battery module and the charge and discharge control equipment, wherein the charge and discharge control equipment is connected with the battery module and is used for controlling the charge and discharge of the battery module. In some embodiments of the present invention, referring to fig. 1, the charge and discharge control device may be located in the host 12, and the power supply system may further include a power adapter 10, where the power adapter 10 is used to supply power to the battery module 11.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A charge and discharge control method is used for controlling charge and discharge of a battery module, the battery module comprises a plurality of batteries connected in parallel, and the charge and discharge control method comprises the following steps:
acquiring the residual electric quantity of the plurality of batteries in a charging mode;
estimating whether a battery with a charging current larger than a preset charging current exists when the plurality of batteries are charged together according to the corresponding relation between the residual electric quantity of the plurality of batteries and a preset electric quantity interval;
if yes, controlling the battery to be charged independently;
and if not, controlling the plurality of batteries to be charged together.
2. The charge and discharge control method according to claim 1, wherein the power intervals include a lowest power interval and a largest difference power interval, and estimating whether there is a battery having a charging current greater than a preset charging current when the plurality of batteries are charged together according to a corresponding relationship between remaining power of the plurality of batteries and a preset power interval comprises:
judging whether the residual electric quantity of the plurality of batteries is within the lowest electric quantity interval or not, and judging whether the difference value of the residual electric quantity of any two batteries in the plurality of batteries is within the maximum difference electric quantity interval or not;
if the residual electric quantity of at least one battery is within the lowest electric quantity interval, estimating that the charging current of at least one battery is larger than a preset charging current when the plurality of batteries are charged together;
if the difference value of the residual electric quantity of at least two batteries is within the maximum difference electric quantity interval, estimating that the charging current of at least one battery is larger than the preset charging current when the batteries are charged together;
and if the residual electric quantity of the batteries is not in the lowest electric quantity interval and the difference value of the residual electric quantity of any two batteries in the batteries is not in the maximum difference electric quantity interval, estimating that the batteries with the charging current larger than the preset charging current do not exist when the batteries are charged together.
3. The charge and discharge control method according to claim 2, wherein the determining whether the remaining power amounts of the plurality of batteries are within the lowest power amount interval includes: judging whether the residual electric quantity of the battery with the minimum rated capacity in the plurality of batteries is in the lowest electric quantity interval or not; if so, the residual electric quantity of at least one battery is in the lowest electric quantity interval; if not, the residual electric quantity of the plurality of batteries is not in the lowest electric quantity interval;
the judging whether the difference value of the remaining electric quantities of any two batteries in the plurality of batteries is within the maximum difference electric quantity interval comprises: judging whether the difference value between the residual electric quantity of the battery with the minimum rated capacity and other batteries in the plurality of batteries is within the maximum difference electric quantity interval or not; if so, the difference value of the residual electric quantity of the at least two batteries is within the maximum difference electric quantity interval; and if not, the difference value of the residual electric quantity of any two batteries in the plurality of batteries is not within the maximum difference electric quantity interval.
4. The charge-discharge control method according to claim 1, wherein the controlling of the battery to be charged alone includes: controlling the battery to be independently charged with a charging current matched with the battery, wherein the charging current matched with the battery is less than or equal to the preset charging current;
the controlling the plurality of batteries to be charged together includes: controlling the plurality of batteries to be charged together with the charging current matched with the battery module; and the charging current matched with the battery module is equal to the sum of the charging currents matched with the batteries.
5. The charge and discharge control method according to any one of claims 2 to 4, wherein the minimum electric-quantity section includes: a range of less than or equal to 5%; the maximum difference electric quantity interval comprises: an interval greater than or equal to 30%.
6. The charge-discharge control method according to claim 1, characterized by further comprising:
determining a plurality of power thresholds and a plurality of residual electric quantity intervals respectively corresponding to the power thresholds according to the maximum discharge power of each battery in the battery module, wherein the power thresholds are sequentially increased;
in a discharging mode, acquiring the residual electric quantity of the battery module, and judging whether the residual electric quantity of the battery module is within the plurality of residual electric quantity intervals;
and if the residual capacity of the battery module is within the residual capacity interval, controlling the maximum load power of the battery module not to exceed a power threshold corresponding to the residual capacity interval so as to enable the discharge current of each battery in the battery module to be smaller than a preset discharge current.
7. The charge-discharge control method according to claim 6, characterized by further comprising:
and if the maximum load power of the battery module exceeds the corresponding power threshold, controlling the battery module to enter a protection state.
8. The charge and discharge control method according to claim 6, wherein a maximum power threshold value among the plurality of power threshold values is equal to a sum of maximum discharge powers of the respective batteries in the battery module; a minimum power threshold of the plurality of power thresholds is equal to a minimum of maximum discharge powers of the plurality of batteries.
9. The charge and discharge control method according to claim 6 or 8, wherein the battery module includes a first battery and a second battery, and the plurality of power thresholds include a first power threshold equal to a sum of a maximum discharge power of the first battery and a maximum discharge power of the second battery, a second power threshold equal to a maximum discharge power of the first battery, and a third power threshold equal to a maximum discharge power of the second battery, the maximum discharge power of the first battery being greater than the maximum discharge power of the second battery;
the remaining capacity interval corresponding to the first power threshold includes: the interval is larger than the lower limit of the residual electric quantity corresponding to the first power threshold; the remaining capacity interval corresponding to the second power threshold includes: a section which is greater than or equal to the lower limit of the remaining power corresponding to the first power threshold and is less than or equal to the lower limit of the remaining power corresponding to the second power threshold; the remaining capacity interval corresponding to the third power threshold includes: and the interval is larger than the lower limit of the residual electric quantity corresponding to the second power threshold.
10. The charge and discharge control method according to claim 9, wherein the lower limit of the remaining power corresponding to the first power threshold is 40%, and the lower limit of the remaining power corresponding to the second power threshold is 20%.
11. A charge-discharge control apparatus, characterized by comprising:
a memory to store instructions;
a controller for executing the charge and discharge control method according to any one of claims 1 to 10, in accordance with the instructions stored in the memory.
12. A power supply system, comprising a battery module and the charge and discharge control device according to claim 11, wherein the charge and discharge control device is connected to the battery module, and the charge and discharge control device is configured to control charge and discharge of the battery module.
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| CN202210867405.XA CN115051446A (en) | 2022-07-22 | 2022-07-22 | Charging and discharging control method, control equipment and power supply system |
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| CN202210867405.XA CN115051446A (en) | 2022-07-22 | 2022-07-22 | Charging and discharging control method, control equipment and power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115954970A (en) * | 2022-12-21 | 2023-04-11 | 国广顺能(上海)能源科技有限公司 | Parallel discharge method, storage medium and electronic equipment |
| CN116231795A (en) * | 2023-02-11 | 2023-06-06 | 珠海康晋电气股份有限公司 | Comprehensive management control system for distributed storage battery |
-
2022
- 2022-07-22 CN CN202210867405.XA patent/CN115051446A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115954970A (en) * | 2022-12-21 | 2023-04-11 | 国广顺能(上海)能源科技有限公司 | Parallel discharge method, storage medium and electronic equipment |
| CN116231795A (en) * | 2023-02-11 | 2023-06-06 | 珠海康晋电气股份有限公司 | Comprehensive management control system for distributed storage battery |
| CN116231795B (en) * | 2023-02-11 | 2023-12-22 | 珠海康晋电气股份有限公司 | Comprehensive management control system for distributed storage battery |
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