CN114336822A - Battery equalization method and device and computer readable storage medium - Google Patents
Battery equalization method and device and computer readable storage medium Download PDFInfo
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- CN114336822A CN114336822A CN202111513458.3A CN202111513458A CN114336822A CN 114336822 A CN114336822 A CN 114336822A CN 202111513458 A CN202111513458 A CN 202111513458A CN 114336822 A CN114336822 A CN 114336822A
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Abstract
The invention discloses a battery equalization method, a device and a computer readable storage medium, wherein the method comprises the following steps: determining the residual capacity of a target battery in a battery pack; when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, determining the time length to be equalized corresponding to the target battery; and balancing the target battery according to the time length to be balanced. The invention improves the target battery balancing effect.
Description
Technical Field
The present invention relates to the field of data processing technologies, and in particular, to a method and an apparatus for balancing a battery, and a computer-readable storage medium.
Background
The consistency difference of the manufacturing process exists when the battery pack leaves a factory, the capacity consistency gradually increases along with the difference of the influence of the running time and the self-discharge in the using process, and therefore the battery pack needs to be balanced to ensure the consistency of the whole life cycle of the target battery. In a series battery pack, the capacity of the battery pack is inconsistent due to the electrical property difference of single cells, so that the service life is attenuated.
Disclosure of Invention
The embodiment of the invention provides a battery balancing method, a battery balancing device and a computer readable storage medium, and aims to solve the technical problem of how to improve the balancing effect of a target battery.
The embodiment of the invention provides a battery equalization method, which comprises the following steps:
determining the residual capacity of a target battery in a battery pack;
when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, determining the time length to be equalized corresponding to the target battery;
and balancing the target battery according to the time length to be balanced.
In an embodiment, after the step of determining the time length to be equalized corresponding to the target battery when the remaining capacity of the target battery is lower than the average remaining capacity of the batteries in the battery pack and lower than the difference between the maximum capacity and the preset capacity, the method includes:
recording the battery identification and the time length to be equalized of the target battery;
the step of balancing the target battery according to the duration to be balanced comprises the following steps:
when a balancing instruction is received, acquiring a battery identifier corresponding to the target battery and a time length to be balanced;
and balancing the target battery according to the battery identification and the time length to be balanced.
In an embodiment, after the step of equalizing the target battery according to the battery identifier and the to-be-equalized time length, the method further includes:
determining an equalized duration when the equalization of the target battery is interrupted;
updating the value of the duration to be equalized to be the difference value between the duration to be equalized and the equalized duration;
and when the time length to be equalized is zero, deleting the recorded battery identification and the time length to be equalized.
In an embodiment, after the step of updating the duration to be equalized to the difference between the duration to be equalized and the equalized duration, the method further includes:
and when the time length to be equalized is greater than zero, if an instruction for continuing to equalize the target battery is received, returning to execute the step of equalizing the target battery according to the battery identification and the time length to be equalized.
In an embodiment, the preset electric quantity is 2% -10% of the maximum electric quantity.
In an embodiment, when the remaining capacity of the target battery is lower than the average remaining capacity of the batteries in the battery pack and lower than a difference between the maximum capacity and a preset capacity, the step of determining the duration to be equalized corresponding to the target battery includes:
when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, taking the difference value between the average residual capacity of the batteries in the battery pack and the residual capacity as the capacity to be equalized;
and dividing the electric quantity to be equalized by the current of the target battery, and taking the obtained quotient as the duration to be equalized.
In one embodiment, before the step of determining the remaining capacity of the target battery in the battery pack, the method further includes:
determining the fault condition of each battery in the battery pack;
when the batteries are not in fault, determining the temperature range of each battery;
when the temperature range is within a preset temperature range, determining the standing time of each battery;
and when the standing time of each battery meets the preset time, determining the target battery in each battery.
In an embodiment, the step of determining the target battery in each battery when the standing time of each battery meets a preset time comprises:
when the standing time of each battery meets the preset time, acquiring the voltage range and the current range of each battery;
determining the target battery in each battery according to the voltage range and the current range.
The embodiment of the present invention further provides a battery balancing device, where the battery balancing device includes: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method for balancing a battery as described above when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the steps of the method for balancing a battery as described above.
In the technical scheme of the embodiment, a balancing device of the battery determines the residual capacity of a target battery in a battery pack; when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, determining the time length to be equalized corresponding to the target battery; and balancing the target battery according to the time length to be balanced. The balancing device of the battery can detect the residual electric quantity of each battery in the battery pack, and then determines the balancing execution condition based on the residual electric quantity, so that active balancing is realized. Meanwhile, the service life cycle is effectively ensured, the capacity of the target battery monomer with the lowest capacity in the battery pack is maximized, the capacity maximization of the battery pack is further realized, and the battery balancing effect 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 schematic diagram of a hardware architecture of an equalizing apparatus for a battery according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a battery equalization method according to a first embodiment of the present invention;
FIG. 3 is a schematic flow chart of a battery equalization method according to a second embodiment of the present invention;
FIG. 4 is a schematic flow chart of a battery balancing method according to a third embodiment of the present invention;
fig. 5 is a schematic flow chart of a battery equalization method according to a fourth embodiment of the present invention.
Detailed Description
For a better understanding of the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The main solution of the invention is: the battery balancing device determines the residual electric quantity of a target battery in the battery pack; when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, determining the time length to be equalized corresponding to the target battery; and balancing the target battery according to the time length to be balanced.
The balancing device of the battery can detect the residual electric quantity of each battery in the battery pack, and then determines the balancing execution condition based on the residual electric quantity, so that active balancing is realized. Meanwhile, the service life cycle is effectively ensured, the capacity of the target battery monomer with the lowest capacity in the battery pack is maximized, the capacity maximization of the battery pack is further realized, and the battery balancing effect is improved.
As an implementation, the equalization device of the battery can be as shown in fig. 1.
The embodiment of the invention relates to a balancing device of a battery, which comprises: a processor 101, e.g. a CPU, a memory 102, a communication bus 103. Wherein a communication bus 103 is used for enabling the connection communication between these components.
The memory 102 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). As in fig. 1, a detection program may be included in the memory 103 as a computer-readable storage medium; and the processor 101 may be configured to call the detection program stored in the memory 102 and perform the following operations:
determining the residual capacity of a target battery in a battery pack;
when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, determining the time length to be equalized corresponding to the target battery;
and balancing the target battery according to the time length to be balanced.
In one embodiment, the processor 101 may be configured to call a detection program stored in the memory 102 and perform the following operations:
recording the battery identification and the time length to be equalized of the target battery;
the step of balancing the target battery according to the duration to be balanced comprises the following steps:
when a balancing instruction is received, acquiring a battery identifier corresponding to the target battery and a time length to be balanced;
and balancing the target battery according to the battery identification and the time length to be balanced.
In one embodiment, the processor 101 may be configured to call a detection program stored in the memory 102 and perform the following operations:
determining an equalized duration when the equalization of the target battery is interrupted;
updating the value of the duration to be equalized to be the difference value between the duration to be equalized and the equalized duration;
and when the time length to be equalized is zero, deleting the recorded battery identification and the time length to be equalized.
In one embodiment, the processor 101 may be configured to call a detection program stored in the memory 102 and perform the following operations:
and when the time length to be equalized is greater than zero, if an instruction for continuing to equalize the target battery is received, returning to execute the step of equalizing the target battery according to the battery identification and the time length to be equalized.
In one embodiment, the processor 101 may be configured to call a detection program stored in the memory 102 and perform the following operations:
the preset electric quantity is 2% -10% of the maximum electric quantity.
In one embodiment, the processor 101 may be configured to call a detection program stored in the memory 102 and perform the following operations:
when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, taking the difference value between the average residual capacity of the batteries in the battery pack and the residual capacity as the capacity to be equalized;
and dividing the electric quantity to be equalized by the current of the target battery, and taking the obtained quotient as the duration to be equalized.
In one embodiment, the processor 101 may be configured to call a detection program stored in the memory 102 and perform the following operations:
determining the fault condition of each battery in the battery pack;
when the batteries are not in fault, determining the temperature range of each battery;
when the temperature range is within a preset temperature range, determining the standing time of each battery;
and when the standing time of each battery meets the preset time, determining the target battery in each battery.
In one embodiment, the processor 101 may be configured to call a detection program stored in the memory 102 and perform the following operations:
when the standing time of each battery meets the preset time, acquiring the voltage range and the current range of each battery;
determining the target battery in each battery according to the voltage range and the current range.
In the technical scheme of the embodiment, a balancing device of the battery determines the residual capacity of a target battery in a battery pack; when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, determining the time length to be equalized corresponding to the target battery; and balancing the target battery according to the time length to be balanced.
The balancing device of the battery can detect the residual electric quantity of each battery in the battery pack, and then determines the balancing execution condition based on the residual electric quantity, so that active balancing is realized. Meanwhile, the service life cycle is effectively ensured, the capacity of the target battery monomer with the lowest capacity in the battery pack is maximized, the capacity maximization of the battery pack is further realized, and the battery balancing effect is improved.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 2, fig. 2 is a first embodiment of an equalizing method of a battery according to the present invention, the method including the steps of:
in step S10, the remaining capacity of the target battery in the battery pack is determined.
The battery packs are connected in series and in parallel, the parallel battery packs require that the voltage of each battery is the same, the output voltage is equal to the voltage of one battery, and the parallel battery packs can provide stronger current; series batteries do not have excessive requirements. In the battery pack, the difference between the single bodies always exists, taking the capacity as an example, the difference never tends to disappear, but the same current flows in the battery pack which is gradually deteriorated, relatively speaking, the large-capacity battery pack always has the conditions of shallow charging and discharging of small current, tends to slow capacity attenuation and prolong service life, the small-capacity battery pack always has the conditions of large current overcharge and discharge, tends to accelerate capacity attenuation and shorten service life, the difference of performance parameters between the large-capacity battery pack and the small-capacity battery pack is increasingly large, a positive feedback characteristic is formed, the small capacity fails in advance, and the service life of the battery pack is shortened.
In this embodiment, the SOC of each battery in the battery pack is detected to obtain a remaining power, SOC (state of charge), which is a state of charge, and is used to reflect the remaining capacity of the battery, and the value is defined as a ratio of the remaining capacity to the battery capacity, and is expressed by a percentage. The value range of the battery charging indicator is 0-1, when the SOC is 0, the battery is completely discharged, and when the SOC is 1, the battery is completely charged.
Optionally, the corresponding remaining capacity is determined by the voltage, current and internal resistance of the target battery in the battery pack.
Optionally, the remaining capacity of the target battery in the battery pack is determined by an internal resistance method, in which the battery is excited by alternating currents with different frequencies, the internal alternating current resistance of the battery is measured, and an SOC estimation value is obtained by an established calculation model. The SOC value of the battery under a certain constant current discharging condition is reflected by the battery SOC measured by the method.
Optionally, the remaining capacity of the target battery in the battery pack is determined by a linear model method, the principle of the linear model method is a linear model established based on the SOC variation, the current, the voltage and the last time point SOC value, and the model is suitable for the low current and SOC gradual change conditions and has high robustness to measurement errors and wrong initial conditions.
Optionally, the remaining capacity of the target battery in the battery pack is determined by a kalman filtering method, which is based on the ampere-hour integration method. The main idea of the Kalman filtering method is to make the optimal estimation of the state of the power system in the sense of minimum variance. The method is applied to the SOC estimation of the battery, the battery is regarded as a power system, and the state of charge is an internal state of the system.
And step S20, when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, determining the time length to be equalized corresponding to the target battery.
In this embodiment, after the remaining capacity of the target battery in the battery pack is obtained, if the remaining capacity is lower than the average remaining capacity of the batteries in the battery pack and lower than the difference between the maximum capacity and the preset capacity, it is determined that the target battery needs to be equalized.
Optionally, when the remaining capacity of the target battery is lower than the average remaining capacity of the batteries in the battery pack and lower than the difference between the maximum capacity and the preset capacity, taking the difference between the average remaining capacity of the batteries in the battery pack and the remaining capacity as the capacity to be equalized; and dividing the electric quantity to be equalized by the current of the target battery, and taking the obtained quotient as the duration to be equalized.
Optionally, the preset electric quantity is 2% -10% of the maximum electric quantity of the target battery.
And step S30, balancing the target battery according to the time length to be balanced.
In this embodiment, when the equalization duration is obtained, the target battery is equalized for a corresponding duration, where the meaning of battery equalization is to keep the cell voltage of the lithium ion battery or the voltage deviation of the battery pack within an expected range by using a power electronic technology, so as to ensure that each cell is kept in the same state during normal use, thereby avoiding occurrence of overcharge and overdischarge. The method is used for actively balancing the capacity individual difference generated in the using process of the battery and the voltage difference generated by the self-discharge rate. The main function of the battery pack is that the difference between battery monomers in the battery pack can be actively balanced no matter the battery pack is in the charging, discharging or placing process, so that various inconsistencies generated in the battery pack due to the battery pack and the use process are eliminated.
In the technical scheme of the embodiment, the balancing device of the battery can detect the residual electric quantity of each battery in the battery pack, and then determines the balancing execution condition based on the residual electric quantity, so that active balancing is realized. Meanwhile, the service life cycle is effectively ensured, the capacity of the target battery monomer with the lowest capacity in the battery pack is maximized, the capacity maximization of the battery pack is further realized, and the battery balancing effect is improved.
Referring to fig. 3, fig. 3 is a second embodiment of the method for balancing a battery according to the present invention, based on the first embodiment, after step S20, the method includes:
and step S40, recording the battery identification and the time length to be equalized of the target battery.
In this embodiment, when power is on, a balancing judgment condition is entered, if a target battery meets the balancing condition, the target battery needing to be started for balancing is judged according to the difference of single-core SOC in a battery pack, and a battery identifier corresponding to the target battery and a time length to be balanced are obtained, and the battery identifier and the time length to be balanced are stored in an associated manner; and if the balance condition is not met, continuously judging whether the target battery in the battery pack meets the balance condition.
Optionally, when the battery is powered on, whether the target battery meets the balancing condition is determined according to the limiting conditions of the target battery, such as voltage, temperature, current, time, faults and the like; if the target battery meets the balancing condition, judging the target battery needing to be started for balancing according to the difference of single-core SOC in the battery pack, and storing a battery identifier corresponding to the target battery and the time length to be balanced in a memory; and if the target battery is judged not to meet the balancing condition according to the limiting conditions such as the voltage, the temperature, the current, the time and the fault of the target battery, whether the target battery meets the balancing condition is continuously judged according to the limiting conditions such as the voltage, the temperature, the current, the time and the fault of the target battery.
Optionally, when the battery is powered on, whether the target battery meets the balancing condition is determined according to the limiting conditions of the target battery, such as voltage, temperature, current, time, faults and the like; if the target battery meets the balance condition, determining the voltage range and the current range of the target battery; and determining the residual capacity of the target battery according to the voltage range and the current range of the target battery. In order to ensure the effectiveness of the equalization flag, the voltage range (high charge state), the temperature range, the current range and the standing time are limited, and no equalization related fault is required. The residual electric quantity is lower than the average residual electric quantity of the batteries in the battery pack, the target battery which is lower than the difference value between the maximum electric quantity and the preset electric quantity is started to be balanced, the consistency difference of the target battery can be guaranteed to be within 2%, excessive balance can be effectively prevented, sufficient balanced electric quantity can be guaranteed, the inconsistency caused in the service life process and the factory consistency difference of the target battery can be met, the service life of the target battery can be effectively prolonged, and the service capacity of the target battery can be improved. The balance starting condition limits the voltage range, the temperature range and whether balance faults exist, the balance can be guaranteed not to affect normal discharge, and the working efficiency of the system can be improved, wherein the balance electric quantity is equal to the product of the balance time and the balance current.
Optionally, determining a fault condition of each battery in the battery pack; when the batteries are not in fault, determining the temperature range of each battery; when the temperature range is within a preset temperature range, determining the standing time of each battery; and when the standing time of each battery meets the preset time, determining the target battery in each battery.
Optionally, when the standing time of each battery meets a preset time, acquiring a voltage range and a current range of each battery; determining the target battery in each battery according to the voltage range and the current range. The current range of the target battery is within a first preset current interval, and the voltage range of the target battery is within a first preset voltage interval.
Step S30 includes:
step S31, when the balancing instruction is received, acquiring the battery identifier and the time length to be balanced corresponding to the target battery.
And step S32, balancing the target battery according to the battery identification and the time length to be balanced.
In this embodiment, when it is determined that the target battery meets the equalization condition, it is determined whether the stored time length to be equalized is 0, and if so, the battery identifier and the time length to be equalized are cleared and the current equalization is exited; if not, carrying out target battery equalization according to the stored battery identification and the time length to be equalized, and carrying out descending calculation on the equalization time length; if power-off is detected in the balancing process, storing the currently judged battery identification and the remaining balancing time of the target battery into the control module, and then powering off; otherwise, continuously judging whether the equalization duration is 0.
Optionally, the target battery is balanced according to the voltage range of the target battery, the battery identifier and the time length to be balanced. And controlling the voltage range of the target battery to be in a second preset voltage range. When the voltage range of the target battery is within the second preset voltage range, the balance can be guaranteed not to influence normal discharge, and the working efficiency of the balance device of the battery is further improved.
In the technical scheme of the embodiment, the equalization duration adopts descending calculation, when the descending is 0, the equalization is considered to be completed, the equalization is executed next time, the equalization consistency requirement (2%) is met, and the equalization duration can be adjusted according to the strategy requirement and the target battery performance.
Referring to fig. 4, fig. 4 is a third embodiment of the method for balancing a battery according to the present invention, based on any one of the first to second embodiments, after step S30, the method further includes:
and step S50, when the equalization of the target battery is interrupted, determining the equalized time length.
Step S60, update the value of the duration to be equalized to the difference between the duration to be equalized and the equalized duration.
And step S70, when the time length to be equalized is zero, deleting the recorded battery identification and the time length to be equalized.
In the technical scheme of this embodiment, it is considered that an equalization interruption occurs, and therefore, when equalization interruption is detected, whether equalization of the target battery is completed is determined based on the determined equalized time length and the recorded time length to be equalized of the target battery, and if so, the equalization number and the time length to be equalized corresponding to the target battery may be deleted to determine that equalization of the corresponding target battery is completed.
Referring to fig. 5, fig. 5 shows a fourth embodiment of the method for balancing a battery according to the present invention, based on any one of the first to third embodiments, after step S60, the method further includes:
and step S80, when the time length to be equalized is greater than zero, if an instruction for continuing to equalize the target battery is received, returning to execute the step of equalizing the target battery according to the battery identification and the time length to be equalized.
In the technical solution of this embodiment, it is considered that an equalization interruption occurs, and therefore, when the equalization interruption is detected, based on the equalized time corresponding to the battery identifier record of the target battery, whether the equalization of the target battery is completed is determined based on the determined equalized time and the recorded time to be equalized, and if the equalization is not completed, the equalization of the corresponding target battery can be continued based on the battery identifier and the updated time to be equalized at the next time.
In order to achieve the above object, an embodiment of the present invention further provides an equalizing device for a battery, where the equalizing device for a battery includes: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method for balancing a battery as described above when executing the computer program.
To achieve the above object, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method for balancing a battery as described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a network configuration product program embodied on one or more computer-usable computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing battery equalization apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing battery equalization apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for equalizing a battery, the method comprising the steps of:
determining the residual capacity of a target battery in a battery pack;
when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, determining the time length to be equalized corresponding to the target battery;
and balancing the target battery according to the time length to be balanced.
2. The method for equalizing batteries according to claim 1, wherein after the step of determining the time period to be equalized corresponding to the target battery when the remaining capacity of the target battery is lower than the average remaining capacity of the batteries in the battery pack and lower than the difference between the maximum capacity and the preset capacity, the method comprises:
recording the battery identification and the time length to be equalized of the target battery;
the step of balancing the target battery according to the duration to be balanced comprises the following steps:
when a balancing instruction is received, acquiring a battery identifier corresponding to the target battery and a time length to be balanced;
and balancing the target battery according to the battery identification and the time length to be balanced.
3. The method for balancing batteries according to claim 2, wherein after the step of balancing the target battery according to the battery identifier and the time length to be balanced, the method further comprises:
determining an equalized duration when the equalization of the target battery is interrupted;
updating the value of the duration to be equalized to be the difference value between the duration to be equalized and the equalized duration;
and when the time length to be equalized is zero, deleting the recorded battery identification and the time length to be equalized.
4. The method for equalizing batteries according to claim 3, wherein after the step of updating the period to be equalized to the difference between the period to be equalized and the equalized period, the method further comprises:
and when the time length to be equalized is greater than zero, if an instruction for continuing to equalize the target battery is received, returning to execute the step of equalizing the target battery according to the battery identification and the time length to be equalized.
5. The method of equalizing batteries according to claim 1, wherein the preset electric quantity is 2% -10% of the maximum electric quantity.
6. The method for equalizing batteries according to any one of claims 1 to 5, wherein the step of determining the time period to be equalized corresponding to the target battery when the remaining capacity of the target battery is lower than the average remaining capacity of the batteries in the battery pack and lower than the difference between the maximum capacity and the preset capacity comprises:
when the residual capacity of the target battery is lower than the average residual capacity of the batteries in the battery pack and lower than the difference value between the maximum capacity and the preset capacity, taking the difference value between the average residual capacity of the batteries in the battery pack and the residual capacity as the capacity to be equalized;
and dividing the electric quantity to be equalized by the current of the target battery, and taking the obtained quotient as the duration to be equalized.
7. The method for equalizing batteries according to claim 1, wherein the step of determining the remaining capacity of the target battery in the battery pack is preceded by the step of:
determining the fault condition of each battery in the battery pack;
when the batteries are not in fault, determining the temperature range of each battery;
when the temperature range is within a preset temperature range, determining the standing time of each battery;
and when the standing time of each battery meets the preset time, determining the target battery in each battery.
8. The method for equalizing batteries according to claim 7, wherein the step of determining the target battery in each of the batteries when the standing time period of each of the batteries satisfies a preset time period comprises:
when the standing time of each battery meets the preset time, acquiring the voltage range and the current range of each battery;
determining the target battery in each battery according to the voltage range and the current range.
9. An equalizing device for a battery, characterized in that the equalizing device for a battery comprises: memory, processor and computer program stored on the memory and executable on the processor, the processor implementing the steps of the method for balancing a battery according to any one of claims 1 to 8 when executing the computer program.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the method of balancing batteries according to any one of claims 1 to 8.
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| CN202111513458.3A CN114336822A (en) | 2021-12-07 | 2021-12-07 | Battery equalization method and device and computer readable storage medium |
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