CN112688386A - Balance control method, device, equipment, storage medium and power supply system - Google Patents
Balance control method, device, equipment, storage medium and power supply system Download PDFInfo
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- CN112688386A CN112688386A CN202011488149.0A CN202011488149A CN112688386A CN 112688386 A CN112688386 A CN 112688386A CN 202011488149 A CN202011488149 A CN 202011488149A CN 112688386 A CN112688386 A CN 112688386A
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Abstract
The invention relates to the technical field of balance control, in particular to a balance control method, a balance control device, balance control equipment, a storage medium and a power supply system, wherein the method comprises the steps of determining a balance battery cell set of a battery pack in a target state; marking each cell in the first and second equalized cell sets; determining the battery cell with the marking times reaching the preset times and the battery cells in the intersection of the first balanced battery cell set and the second balanced battery cell set as target balanced battery cells; and determining an equalization rule according to the position of the target equalization cell, and controlling the target equalization cell to perform equalization discharge according to the equalization rule. According to the battery pack, the target balance battery cells needing to be balanced can be identified to be passively balanced, the number of the passive balance battery cells is reduced, the target balance battery cells are controlled to discharge in turn, the situation that the battery pack is overheated inside is effectively avoided, the safety and the reliability of the battery pack are improved, and in addition, the passive balance current is also improved, so that the passive balance efficiency is improved.
Description
Technical Field
The invention relates to the technical field of balance control, in particular to a balance control method, a balance control device, balance control equipment, a storage medium and a power supply system.
Background
Energy crisis and environmental pollution have become two major problems affecting social development, and all countries in the world are working on solving the two major problems. Under the background of people in various countries in the world who are continuously calling for 'low-carbon life', new energy sources begin to occupy more and more important positions, and various novel batteries are unprecedentedly developed as part of the new energy sources. For example, in recent years, the development of energy storage field pushes the application of lithium battery to a new peak.
However, due to the limitations of power and voltage, lithium batteries are required to be connected in series for use in most applications, however, the difference of the capacity, internal resistance and self-discharge rate of lithium batteries easily causes the difference of the battery capacity, and due to the existence of the "barrel effect", the effective capacity of the whole lithium battery pack depends on the single battery with the minimum capacity, resulting in the waste of the battery capacity. In order to increase the capacity of the whole lithium battery pack, people begin to adopt a passive equalization strategy, that is, a single battery with higher voltage is discharged, electric quantity is released in the form of heat, and more charging time is strived for other batteries.
However, if the number of the batteries needing balanced discharge in the lithium battery pack is large, a large number of batteries are discharged together, so that the interior of the lithium battery pack is overheated, the balanced current is too small, the balanced efficiency is reduced, and the safety and the reliability of the lithium battery pack are affected.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method, an apparatus, a device, a storage medium and a power supply system for controlling equalization, so as to overcome the problem that the interior of a lithium battery pack is overheated due to discharge of a large number of batteries in the lithium battery pack, which not only causes too small equalization current to reduce equalization efficiency, but also affects safety and reliability of the lithium battery pack.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides a method for controlling equalization, including:
determining a balanced battery cell set of the battery pack in a target state; the target states comprise a charging initial state and a charging end state, and the equalizing cell sets comprise a first equalizing cell set corresponding to the charging initial state and a second equalizing cell set corresponding to the charging end state;
marking each cell in the first and second balanced cell sets;
determining the cells with the marking times reaching preset times in the first equalizing cell set and the second equalizing cell set, and the cells in the intersection of the first equalizing cell set and the second equalizing cell set as target equalizing cells;
and determining an equalization rule according to the position of the target equalization cell, and controlling the target equalization cell to perform equalization discharge according to the equalization rule when the target equalization cell is charged next time.
Further, in the above balancing control method, the determining a balanced battery cell set of the battery pack in the target state includes:
determining monomer parameters of a battery cell in the battery pack in a target state; the single parameters comprise a first single parameter corresponding to the initial charging state and a second single parameter corresponding to the final charging state;
and determining the first balanced battery cell set according to the first monomer parameter, and determining the second balanced battery cell set according to the second monomer parameter.
Further, in the above balancing control method, the first monomer parameter includes a first remaining capacity;
the first monomer parameter determination process comprises:
determining a battery cell in a preset linear region in the battery pack;
measuring a first cell voltage of each cell in the linear region in the initial charging state;
and calculating the first residual capacity corresponding to the first cell voltage based on a preset linear relation between the first cell voltage and the residual capacity.
Further, in the above equalization control method, determining the first equalization cell set according to the first cell parameter includes:
determining a first average value of the first remaining capacity;
and combining the cells with the first residual capacity larger than the sum of the first average value and a first preset threshold value into the first balanced cell set.
Further, in the above balance control method, the second monomer parameter includes a second remaining capacity;
the second monomer parameter determination process comprises:
measuring a second cell voltage of each battery cell in the battery pack when the charging is finished;
and calculating the second residual capacity corresponding to the second cell voltage based on a preset linear relation between the second cell voltage and the residual capacity.
Further, in the above equalization control method, determining the second equalization cell set according to the second cell parameter includes:
determining a second average value of the second remaining capacity;
and combining the cells with the second residual capacity larger than the sum of the second average value and a second preset threshold value into the second balanced cell set.
Further, the above equalization control method, where an equalization rule is determined according to the position of the target equalization cell, and the target equalization cell is controlled to perform equalization discharge according to the equalization rule when charging next time, includes:
dividing the target equalization battery cells into a plurality of equalization groups according to the positions of the target equalization battery cells;
and carrying out equalizing discharge on the equalizing groups in turn during the next charging according to a preset sequence.
Further, in the above balancing control method, the cells in each balancing group are not adjacent to each other.
In another aspect, the present invention further provides a balance control apparatus, including: the device comprises a determining module, a marking module and a control module;
the determining module is used for determining a balanced battery cell set of the battery pack in a target state; the target states comprise a charging initial state and a charging end state, and the equalizing cell sets comprise a first equalizing cell set corresponding to the charging initial state and a second equalizing cell set corresponding to the charging end state;
the marking module is configured to mark each cell in the first equalizing cell set and the second equalizing cell set;
the determining module is further configured to determine, as a target balanced cell, a cell in an intersection of the first balanced cell set and the second balanced cell set, where the number of times of marking in the first balanced cell set and the second balanced cell set reaches a preset number of times;
the control module is used for determining an equalization rule according to the position of the target equalization cell and controlling the target equalization cell to perform equalization discharge according to the equalization rule when the target equalization cell is charged next time.
Further, in the above balancing control apparatus, the determining module is specifically configured to determine a cell parameter of a battery cell in the battery pack in a target state; the single parameters comprise a first single parameter corresponding to the initial charging state and a second single parameter corresponding to the final charging state; and determining the first balanced battery cell set according to the first monomer parameter, and determining the second balanced battery cell set according to the second monomer parameter.
In another aspect, the present invention further provides a balance control device, including a processor and a memory, where the processor is connected to the memory:
the processor is used for calling and executing the program stored in the memory;
the memory is configured to store the program, and the program is at least configured to execute the balance control method according to any one of the above.
In another aspect, the present invention further provides a power supply system, which includes a battery pack and the above-mentioned balancing control device;
the battery pack is connected with the balance control equipment.
In another aspect, the present invention further provides a storage medium storing a program, which when executed by a processor, implements each step of the balance control method described in any one of the above.
The invention discloses a balance control method, a device, equipment, a storage medium and a power supply system, wherein the method comprises the steps of determining a balance battery cell set of a battery pack in a target state; the target state comprises a charging initial state and a charging end state, and the equalizing cell set comprises a first equalizing cell set corresponding to the charging initial state and a second equalizing cell set corresponding to the charging end state; marking each cell in the first and second equalized cell sets; determining the cells with the marking times reaching the preset times in the first equalizing cell set and the second equalizing cell set, and the cells in the intersection of the first equalizing cell set and the second equalizing cell set as target equalizing cells; and determining an equalization rule according to the position of the target equalization cell, and controlling the target equalization cell to perform equalization discharge according to the equalization rule when the target equalization cell is charged next time. By adopting the technical scheme, the most urgent target balance battery cell needing to be balanced can be identified to carry out passive balance, the number of the passive balance battery cells is reduced, the target balance battery cells are controlled to discharge in turn, the situation that the battery pack is overheated inside is effectively avoided, the safety and the reliability of the battery pack are improved, and in addition, the passive balance current is also improved, so that the passive balance efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an equalization control method according to an embodiment of the present invention;
fig. 2 is a graph of relationship between cell voltage and residual capacity in a static state of a lithium iron phosphate battery provided by an embodiment of the present invention;
FIG. 3 is a graph of the cell voltage versus residual capacity in a static state according to one embodiment of the present invention;
FIG. 4 is a graph of dynamic state cell voltage versus remaining capacity according to one embodiment of the present invention;
fig. 5 is a schematic sectional view of a battery pack according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a target balancing cell partition according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an equalization control apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an equalization control apparatus according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a power supply system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a flowchart of an equalization control method according to an embodiment of the present invention.
As shown in fig. 1, the equalization control method of this embodiment may include the following steps:
s101, determining a balance battery cell set of the battery pack in a target state.
Optionally, the target state includes an initial charging state and an end charging state, and the equalizing cell set includes a first equalizing cell set corresponding to the initial charging state and a second equalizing cell set corresponding to the end charging state.
The initial state of charge is the resting state of the battery pack. The initial charging state comprises a state when the battery pack is initially charged and is not charged and discharged; the initial charging state also includes a state when the battery pack is just started, that is, a state when the power supply is just accessed for charging. The end-of-charge state is a dynamic state.
Optionally, the staff may remotely determine the first equalizing cell set and the second equalizing cell set through the upper computer, and may also determine the first equalizing cell set and the second equalizing cell set according to the following steps:
the method comprises the following steps: determining monomer parameters of a battery cell in the battery pack in a target state; the single parameter comprises a first single parameter corresponding to the initial charging state and a second single parameter corresponding to the ending charging state;
step two: and determining a first balanced battery cell set according to the first monomer parameter, and determining a second balanced battery cell set according to the second monomer parameter.
Specifically, in this embodiment, a first cell parameter corresponding to the initial charging state and a second cell parameter corresponding to the end charging state may be determined first. Each of the first cell parameter and the second cell parameter may include a State of Charge (SOC) of the battery cell, a cell Voltage (OCV), a current, an internal resistance, and the like. That is, the first equalizing cell set may be determined by the SOC, OCV, current, or internal resistance corresponding to the initial state of charge, and the second equalizing cell set may be determined by the SOC, OCV, current, or internal resistance corresponding to the end-of-charge state.
Generally, the first comparison range corresponding to the initial state of charge and the second comparison range corresponding to the end state of charge may be set by the operator according to the type and charge/discharge characteristics of the battery pack. When the first monomer parameter is in the first comparison range, the battery cells corresponding to the first monomer parameter may be combined into a first balanced battery cell set; when the second cell parameter is in the second comparison range, the cell cores corresponding to the second cell parameter may be combined into a second balanced cell set.
Optionally, the first monomer parameter of this embodiment includes a first residual capacity. The first remaining capacity may be determined according to the following steps;
the method comprises the following steps: determining a battery cell in a preset linear region in a battery pack;
step two: measuring the first cell voltage of each cell in the linear region in the initial charging state;
step three: and calculating the first residual capacity corresponding to the first cell voltage based on a preset linear relation between the first cell voltage and the residual capacity.
Specifically, the residual capacity of the lithium battery and the cell voltage have a certain correlation. The cell voltage of a part of the batteries is linearly related to the remaining capacity. For example, the ternary lithium battery has a good linear correspondence relationship between the cell voltage and the residual capacity at any moment.
Fig. 2 is a graph showing a relationship between a cell voltage and a residual capacity in a static state of a lithium iron phosphate battery according to an embodiment of the present invention.
As shown in fig. 2, in the lithium iron phosphate battery, the cell voltage and the residual capacity are not in a linear relationship at any time, and the cell voltage and the residual capacity are in a linear region in the range of 0 to 15 and 85 to 100, and the corresponding residual capacity can be calculated from the cell voltage. The range with the residual capacity of 15-85 is a platform area, the monomer voltage and the residual capacity in the platform area have no linear relation, and the corresponding residual capacity cannot be calculated according to the monomer voltage.
In general, for a non-linear battery similar to a lithium iron phosphate battery, the plateau region is generally located in the middle region of the remaining capacity of the battery. Since the voltage of the battery does not vary greatly in the middle section, it is difficult to distinguish the difference in the remaining capacity of the battery according to the voltage, and equalization may not be necessary. When the battery is about to be fully charged and the battery is discharged and cut off, the voltage change amplitude of the battery is accelerated, the voltage difference, the capacity difference and the consistency difference of the battery are displayed, and therefore the relationship between the voltage of the single battery and the residual capacity is a linear region. The residual capacity value can be calculated according to the cell voltage, and then the balance battery cell set is determined according to the residual capacity value.
In the initial state of charging, the embodiment may determine the cell in the linear region first. The linear region can be set by a worker in a pre-defined manner according to the specification and the charge-discharge characteristic of the battery pack.
For example, when the cell voltage is kept constant within a preset range as the charging process advances gradually, it may be considered to be in a plateau region, and if the cell voltage gradually increases as the charging process advances gradually, it may be determined to be in a linear region. A judgment threshold slope k can be set, and when the slope of a linear relation curve of the monomer voltage-residual capacity is greater than k, the battery cell is in a linear region; and if the slope of the curve is less than k, indicating that the battery cell is in the platform area.
Therefore, cells in the battery pack in a preset linear region may be determined first. And then according to the first cell voltage of each battery cell in the linear region in the initial charging state, determining a first initial residual capacity according to a preset linear relation between the first cell voltage and the residual capacity.
Then, the first initial remaining capacity is corrected using a State of Health (SOH) coefficient and an environmental compensation coefficient, resulting in the first remaining capacity of the present embodiment.
Wherein, the SOH coefficient is the cumulative number of charge and discharge times/the nominal number of charge and discharge times in the specification multiplied by 20%. 20% is the residual capacity after 100% of the standard number of charge and discharge of the battery. The environmental compensation coefficient can be adjusted in real time according to the influence of the external environment and the project requirement, and is set to be 1 by default.
FIG. 3 is a graph of cell voltage versus residual capacity for a static state provided by one embodiment of the present invention.
Alternatively, as shown in fig. 3, this embodiment provides a linear relationship diagram of cell voltage-residual capacity in a static state, which represents a linear relationship of the first cell voltage-residual capacity. The first initial residual capacity can be determined in the relationship chart shown in fig. 3 by the cell voltage.
After the first remaining capacity is obtained, the first balance cell set may be determined according to the first remaining capacity. Optionally, in this embodiment, the first equalizing cell set is determined according to the following steps:
the method comprises the following steps: determining a first average value of the first remaining capacity;
step two: and combining the cells with the first residual capacity larger than the sum of the first average value and the first preset threshold value into a first balanced cell set.
Specifically, a first average value of the first residual capacities of all the cells in the linear region may be calculated. The target cells in which the first residual capacity is higher than the "first average value + the first preset threshold" among the cells in the linear region are combined into the first balanced cell set of the present embodiment.
The first preset threshold value staff may be set according to the specification and the charge-discharge characteristic of the battery pack, and this embodiment is not limited.
Optionally, the second monomer parameter of this embodiment includes a second residual capacity. The second remaining capacity may be determined according to the following steps:
the method comprises the following steps: measuring a second monomer voltage of each battery cell in the battery pack when the charging is finished;
step two: and calculating a second residual capacity corresponding to the second cell voltage based on a preset linear relation between the second cell voltage and the residual capacity.
Optionally, in the end-of-charge state, the cell voltages of all the batteries and the remaining capacity may have a linear relationship. Therefore, in the charging end state, the second cell voltage of each battery cell in the battery pack is measured, and then the second initial residual capacity corresponding to the second cell voltage is determined according to the preset linear relationship between the second cell voltage and the residual capacity. Similarly, the second initial remaining capacity is corrected using the SOH coefficient and the environmental compensation coefficient, and the second remaining capacity of the present embodiment is obtained.
FIG. 4 is a linear relationship diagram of dynamic state cell voltage versus remaining capacity provided by an embodiment of the present invention.
Optionally, as shown in fig. 4, this embodiment provides a linear relationship diagram of cell voltage-residual capacity in a dynamic state, which represents a linear relationship of the second cell voltage-residual capacity. The second initial residual capacity can be determined in the relationship chart shown in fig. 4 by the cell voltage.
After the second remaining capacity is obtained, a second balanced cell set may be determined according to the second remaining capacity. Optionally, in this embodiment, the second balancing cell set is determined according to the following steps:
the method comprises the following steps: determining a second average value of the second remaining capacity;
step two: and combining the cells with the second residual capacity larger than the sum of the second average value and the second preset threshold value into a second balanced cell set.
Specifically, a second average value of the second remaining capacities of all the battery cells may be calculated. The target cells in all the cells, in which the second residual capacity is higher than the "second average value + the second preset threshold value", are combined to form the second balanced cell set of this embodiment.
The second preset threshold value staff can be set according to the specification and the charging and discharging characteristics of the battery pack, the first preset threshold value and the second preset threshold value can be the same or different, and the embodiment is not limited.
And S102, marking each battery cell in the first balanced battery cell set and the second balanced battery cell set.
Optionally, each cell in the first equalizing cell set and the second equalizing cell set may be marked, and if a certain cell is marked at this time, 1 may be added to the corresponding marking record.
S103, determining the battery cell with the marking times reaching the preset times in the first equalizing battery cell set and the second equalizing battery cell set, and determining the battery cell in the intersection of the first equalizing battery cell set and the second equalizing battery cell set as a target equalizing battery cell.
Optionally, comparing the cells in the first balanced cell set and the second balanced cell set, calling out a mark record of the cells in the first balanced cell set and the second balanced cell set, intersecting the cells in the first balanced cell set and the second balanced cell set, and determining the cells with the mark times reaching the preset times in the first balanced cell set and the second balanced cell set as target balanced cells.
Optionally, the preset number of times is 5.
Fig. 5 is a schematic view of a partition of a battery pack according to an embodiment of the present invention.
Alternatively, as shown in fig. 5, in this embodiment, the battery cell in the battery pack is divided into three regions, which are a region X, a region Y, and a region Z. The region X contains a target balance battery cell, and balance discharge is preferentially carried out; the battery cell marked in the area Y and marked for less than 5 times is judged, and whether the actual residual capacity of the battery cell is different from other battery cells or not is judged by circularly recording the marking times of the battery cell; the cells in zone Z are not marked and do not require equalization for the time being.
And S104, determining an equalization rule according to the position of the target equalization cell, and controlling the target equalization cell to perform equalization discharge according to the equalization rule when the target equalization cell is charged next time.
Optionally, the position of the target equalization cell may be determined, and then an equalization rule is determined according to the position of the target equalization cell, so that the target equalization cell alternately performs equalization discharge when the next charging is performed according to the equalization rule, that is, before the next equalization.
Optionally, in this embodiment, the equalizing discharge is performed through the following steps:
the method comprises the following steps: dividing the target balance battery cell into a plurality of balance groups according to the position of the target balance battery cell;
step two: and according to the preset sequence, carrying out equalizing discharge on the equalizing groups in turn during the next charging.
Specifically, the cells included in each group of equalization groups are not adjacent to each other, so that the passive equalization time is reasonably planned in a peak staggering manner.
Fig. 6 is a schematic diagram of a target balancing cell partition according to an embodiment of the present invention.
Optionally, as shown in fig. 6, in this embodiment, the target balance battery cell is divided into two balance groups, where the first group includes the battery cell 1, the battery cell 2, the battery cell 3, and the battery cell 4, and the second group includes the battery cell 5, the battery cell 6, the battery cell 7, and the battery cell 8. Electric core 1, electric core 2, electric core 3, electric core 4 in the first group are not adjacent to each other, and electric core 5, electric core 6, electric core 7, electric core 8 in the second group are not adjacent to each other. In the first half of the time, the battery cell 1, the battery cell 2, the battery cell 3 and the battery cell 4 can be preferentially balanced, and in the second half of the time, the battery cell 5, the battery cell 6, the battery cell 7 and the battery cell 8 are switched to be balanced after the temperature of the battery cell 1, the battery cell 2, the battery cell 3 and the battery cell 4 rises. The reasonable alternating cycle discharge passive balance is beneficial to better heat dissipation of the battery pack, and the passive balance current can be improved, so that the passive balance efficiency is improved.
The balance control method comprises the steps of determining a balance battery cell set of a battery pack in a target state; the target state comprises a charging initial state and a charging end state, and the equalizing cell set comprises a first equalizing cell set corresponding to the charging initial state and a second equalizing cell set corresponding to the charging end state; marking each cell in the first and second equalized cell sets; determining the cells with the marking times reaching the preset times in the first equalizing cell set and the second equalizing cell set, and the cells in the intersection of the first equalizing cell set and the second equalizing cell set as target equalizing cells; and determining an equalization rule according to the position of the target equalization cell, and controlling the target equalization cell to perform equalization discharge according to the equalization rule when the target equalization cell is charged next time. By adopting the technical scheme of the embodiment, the target balance battery cell which needs to be balanced most urgently can be identified to perform passive balance, the number of the passive balance battery cells is reduced, the target balance battery cells are controlled to discharge in turn, the situation that the battery pack is overheated is effectively avoided, the safety and the reliability of the battery pack are improved, and the passive balance current is also improved, so that the passive balance efficiency is improved.
Fig. 7 is a schematic structural diagram of an equalization control apparatus according to an embodiment of the present invention.
Based on a general inventive concept, the present invention further provides a balance control apparatus for implementing the above method embodiments.
As shown in fig. 7, the balance control apparatus of the present embodiment includes: a determination module 11, a marking module 12 and a control module 13;
the determining module 11 is configured to determine a balanced battery cell set of the battery pack in a target state; the target state comprises a charging initial state and a charging end state, and the equalizing cell set comprises a first equalizing cell set corresponding to the charging initial state and a second equalizing cell set corresponding to the charging end state;
a marking module 12, configured to mark each cell in the first equalizing cell set and the second equalizing cell set;
the determining module 11 is further configured to determine, as a target balanced battery cell, a battery cell in an intersection of the first balanced battery cell set and the second balanced battery cell set, and a battery cell in the first balanced battery cell set and the second balanced battery cell set, where the number of times of marking reaches a preset number of times;
and the control module 13 is configured to determine an equalization rule according to the position of the target equalization cell, and control the target equalization cell to perform equalization discharge according to the equalization rule when the target equalization cell is charged next time.
By adopting the technical scheme of the embodiment, the target balance battery cell which needs to be balanced most urgently can be identified to perform passive balance, the number of the passive balance battery cells is reduced, the target balance battery cells are controlled to discharge in turn, the situation that the battery pack is overheated is effectively avoided, the safety and the reliability of the battery pack are improved, and the passive balance current is also improved, so that the passive balance efficiency is improved.
Optionally, in the equalization control device of this embodiment, the first monomer parameter includes a first remaining capacity;
the determining module 11 is specifically configured to determine a battery cell in a preset linear region in the battery pack; measuring the first cell voltage of each cell in the linear region in the initial charging state; and calculating the first residual capacity corresponding to the first cell voltage based on a preset linear relation between the first cell voltage and the residual capacity.
Optionally, in the balance control apparatus of this embodiment, the determining module 11 is specifically further configured to determine a first average value of the first remaining capacity; and combining the cells with the first residual capacity larger than the sum of the first average value and the first preset threshold value into a first balanced cell set.
Optionally, in the equalization control device of this embodiment, the second monomer parameter includes a second remaining capacity;
the determining module 11 is specifically configured to measure a second cell voltage of each battery cell in the battery pack when the charging is finished; and calculating a second residual capacity corresponding to the second cell voltage based on a preset linear relation between the second cell voltage and the residual capacity.
Optionally, in the equalization control device of this embodiment, the determining module 11 is specifically further configured to determine a second average value of the second remaining capacity; and combining the cells with the second residual capacity larger than the sum of the second average value and the second preset threshold value into a second balanced cell set.
Optionally, in the equalization control device of this embodiment, the control module 13 is specifically configured to divide the target equalization battery cells into a plurality of equalization groups according to the positions of the target equalization battery cells; and according to the preset sequence, carrying out equalizing discharge on the equalizing groups in turn during the next charging. And the cells in each balance group are not adjacent to each other.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Based on a general inventive concept, the present invention further provides a balance control apparatus for implementing the above method embodiments.
Fig. 8 is a schematic structural diagram of an equalization control apparatus according to an embodiment of the present invention.
As shown in fig. 8, the equalization control apparatus of the present embodiment includes a processor 21 and a memory 22, and the processor 21 is connected to the memory 22. Wherein, the processor 21 is used for calling and executing the program stored in the memory 22; the memory 22 is used to store a program for executing at least the equalization control method in the above embodiment.
Based on a general inventive concept, the present invention also provides a power supply system for implementing the above method embodiments.
Fig. 9 is a schematic structural diagram of a power supply system according to an embodiment of the present invention.
As shown in fig. 9, the power supply system of the present embodiment includes a battery pack 31 and the balance control device 32 of any of the above embodiments; the battery pack 31 is connected to the equalization control device 32.
Based on one general inventive concept, the present invention also provides a storage medium for implementing the above-described method embodiments.
The storage medium of the present embodiment stores a program, and the program stored in the storage medium realizes the equalization control method in any one of the above embodiments when executed by a processor.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. A method of equalization control, comprising:
determining a balanced battery cell set of the battery pack in a target state; the target states comprise a charging initial state and a charging end state, and the equalizing cell sets comprise a first equalizing cell set corresponding to the charging initial state and a second equalizing cell set corresponding to the charging end state;
marking each cell in the first and second balanced cell sets;
determining the cells with the marking times reaching preset times in the first equalizing cell set and the second equalizing cell set, and the cells in the intersection of the first equalizing cell set and the second equalizing cell set as target equalizing cells;
and determining an equalization rule according to the position of the target equalization cell, and controlling the target equalization cell to perform equalization discharge according to the equalization rule when the target equalization cell is charged next time.
2. The balance control method according to claim 1, wherein the determining a balance cell set of the battery pack in the target state includes:
determining monomer parameters of a battery cell in the battery pack in a target state; the single parameters comprise a first single parameter corresponding to the initial charging state and a second single parameter corresponding to the final charging state;
and determining the first balanced battery cell set according to the first monomer parameter, and determining the second balanced battery cell set according to the second monomer parameter.
3. The balance control method according to claim 2, wherein the first monomer parameter includes a first remaining capacity;
the first monomer parameter determination process comprises:
determining a battery cell in a preset linear region in the battery pack;
measuring a first cell voltage of each cell in the linear region in the initial charging state;
and calculating the first residual capacity corresponding to the first cell voltage based on a preset linear relation between the first cell voltage and the residual capacity.
4. The balance control method according to claim 3, wherein the determining the first set of balance cells according to the first cell parameter includes:
determining a first average value of the first remaining capacity;
and combining the cells with the first residual capacity larger than the sum of the first average value and a first preset threshold value into the first balanced cell set.
5. The balance control method according to claim 2, wherein the second monomer parameter includes a second remaining capacity;
the second monomer parameter determination process comprises:
measuring a second cell voltage of each battery cell in the battery pack when the charging is finished;
and calculating the second residual capacity corresponding to the second cell voltage based on a preset linear relation between the second cell voltage and the residual capacity.
6. The balance control method according to claim 5, wherein the determining the second balance cell set according to the second cell parameter includes:
determining a second average value of the second remaining capacity;
and combining the cells with the second residual capacity larger than the sum of the second average value and a second preset threshold value into the second balanced cell set.
7. The equalization control method according to claim 1, wherein the determining an equalization rule according to the position of the target equalization cell and controlling the target equalization cell to perform equalization discharge according to the equalization rule during next charging comprises:
dividing the target equalization battery cells into a plurality of equalization groups according to the positions of the target equalization battery cells;
and carrying out equalizing discharge on the equalizing groups in turn during the next charging according to a preset sequence.
8. The balance control method according to claim 7, wherein the cells in each balance group are not adjacent to each other.
9. An equalization control apparatus, comprising: the device comprises a determining module, a marking module and a control module;
the determining module is used for determining a balanced battery cell set of the battery pack in a target state; the target states comprise a charging initial state and a charging end state, and the equalizing cell sets comprise a first equalizing cell set corresponding to the charging initial state and a second equalizing cell set corresponding to the charging end state;
the marking module is configured to mark each cell in the first equalizing cell set and the second equalizing cell set;
the determining module is further configured to determine, as a target balanced cell, a cell in an intersection of the first balanced cell set and the second balanced cell set, where the number of times of marking in the first balanced cell set and the second balanced cell set reaches a preset number of times;
the control module is used for determining an equalization rule according to the position of the target equalization cell and controlling the target equalization cell to perform equalization discharge according to the equalization rule when the target equalization cell is charged next time.
10. The equalization control device according to claim 9, wherein the determining module is specifically configured to determine individual parameters of cells in the battery pack in a target state; the single parameters comprise a first single parameter corresponding to the initial charging state and a second single parameter corresponding to the final charging state; and determining the first balanced battery cell set according to the first monomer parameter, and determining the second balanced battery cell set according to the second monomer parameter.
11. An equalization control device comprising a processor and a memory, said processor coupled to said memory:
the processor is used for calling and executing the program stored in the memory;
the memory is used for storing the program, and the program is at least used for executing the balance control method of any one of claims 1-8.
12. A power supply system characterized by comprising a battery pack and the balance control apparatus of claim 11;
the battery pack is connected with the balance control equipment.
13. A storage medium, characterized in that the storage medium stores a program that, when executed by a processor, implements the steps of the equalization control method according to any one of claims 1 to 8.
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