CN114726037A - Control method for full-time equalization of battery and electronic equipment - Google Patents
Control method for full-time equalization of battery and electronic equipment Download PDFInfo
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- CN114726037A CN114726037A CN202210356051.2A CN202210356051A CN114726037A CN 114726037 A CN114726037 A CN 114726037A CN 202210356051 A CN202210356051 A CN 202210356051A CN 114726037 A CN114726037 A CN 114726037A
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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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
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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
- H02J7/005—Detection of state of health [SOH]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The application provides a control method and electronic equipment for full-time equalization of a battery, wherein the battery comprises a charging stage and a non-charging stage, and the control method comprises the following steps: acquiring a stable time period when the battery is in a preset stable state in different stages; determining a cell state during the stabilization period; determining whether to adjust an equalization procedure based on the cell state. The states of the batteries are detected and screened to obtain effectively balanced individuals in the stable stage of the batteries, and the balancing strategy is adjusted in time, so that effective full-time balancing is performed, and balancing efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a battery full-time balancing control method and electronic equipment.
Background
The vehicle power battery pack is composed of a plurality of battery monomers, and in the manufacturing process, the internal structures, materials and the like of the batteries are not completely consistent, so that the parameters of the battery monomers, such as the capacity, the internal resistance, the voltage and the like, are not completely consistent. During charging and discharging, batteries with smaller capacity in the battery pack are easy to be overcharged and overdischarged, so that the service life of the single battery is shortened, and the service life of the whole battery pack is influenced. In order to solve the inconsistency of the single batteries, the prior art mostly adopts a passive equalization technology with simple circuit and low cost, and consumes redundant energy in the batteries with larger capacity in the battery pack in the charging process so as to realize the voltage equalization of each battery in the battery pack and keep the consistency of the single batteries. Namely, the balance resistor is connected in parallel, so that the redundant energy of the battery can be released through the heating of the balance resistor. However, the equalizing resistor is small, the generated heat is large, the temperature rise of hardware is large, thermal runaway is easily caused, the charging process time is short when the large-resistance resistor is used for equalization, the equalization time cannot be met, and effective equalization of equalizing monomers cannot be guaranteed.
Therefore, how to increase the equalization time and equalize the effective monomers becomes an urgent technical problem to be solved.
Disclosure of Invention
In order to solve the technical problems of how to increase the equalization time and equalize the effective cells explained in the background art, the application provides a control method and an electronic device for full-time equalization of a battery.
According to a first aspect, an embodiment of the present application provides a control method for full-time equalization of a battery, where the battery includes a charging phase and a non-charging phase, and the control method includes: acquiring a stable time period when the battery is in a preset stable state in different stages; determining a cell state during the stabilization period; determining whether to adjust an equalization procedure based on the cell state.
Further, the acquiring the stable time period when the battery is in the preset stable state in different stages includes: acquiring battery electric energy parameters; judging whether the electric energy parameter meets a first preset electric energy parameter range or not; and when the electric energy parameter meets a first preset electric energy parameter range, determining that the battery enters the stable time period.
Further, before the obtaining of the battery power parameter, the method includes: judging whether the battery is in a preset health state or not; and when the battery is in a preset health state, entering the acquisition of battery electric energy parameters.
Further, when the battery is in a non-preset state of health and the battery is in a non-charging stage; the acquiring the stable time period of the battery in the preset stable state in different stages comprises: judging whether the duration of the non-charging stage is longer than a preset duration and whether the electric energy parameter is within a second preset electric energy parameter range; and when the duration of the non-charging stage is greater than a preset duration and the electric energy parameter is within a second preset electric energy parameter range, determining that the battery enters the stable time period.
Further, the non-charging phase includes a rest phase and/or a discharging phase.
Further, the determining the cell state in the stable period includes: acquiring a minimum cell voltage value in the current battery cell; comparing the voltage values of all the single batteries with the minimum single voltage value in sequence; and taking the single battery with the voltage difference with the minimum single voltage value larger than a preset value as a single battery to be balanced.
Further, the determining whether to adjust the equalization program based on the cell state includes: acquiring a battery monomer of a current execution balancing program; judging whether the battery monomer to be equalized is consistent with the battery monomer of the currently executed equalizing program; and when the battery monomer to be equalized is inconsistent with the battery monomer currently executing the equalization program, replacing the battery monomer to be equalized with the battery monomer executing the equalization program.
Further, the method also comprises the following steps: judging whether the battery meets at least one condition of a fault state, whether the temperature of the single battery exceeds a first preset temperature, whether the temperature of the equalizing resistor exceeds a second preset temperature and whether the temperature of the equalizing chip exceeds a third preset temperature; and when the balance state is satisfied, exiting the equalization program.
Further, the battery comprises an equalization resistor, and when the battery cell to be equalized is consistent with the battery cell currently executing the equalization program, the battery exits the equalization program after the battery executes the equalization program for a preset time; the preset time is determined based on the resistance value of the equalizing resistor.
According to an aspect of the embodiments of the present application, there is provided an electronic device, including a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus, and the memory is configured to store a computer program; the processor is configured to execute the steps of the method for controlling full-time battery equalization according to any of the preceding claims by executing the computer program stored in the memory.
In the embodiment of the application, the heat dissipation problem of the equalizing resistor is considered, and in order to prevent the thermal runaway caused by overlarge generated heat and large temperature rise of hardware, the large-resistance resistor is adopted for passive equalization. Because the equalization time length is calculated according to the resistance value of the equalization resistor, the equalization time required by passive equalization of the large resistance value is long, and the equalization time cannot be met only by equalization in the charging process. Therefore, the effective balancing individuals are selected in the time period when the battery performance tends to be stable, and the balancing program is updated. The battery can be balanced in the standing process, the releasing process and the charging stage, the starting time of a balancing program is prolonged, the temperature rise is reduced, effective full-time balancing is carried out, the efficiency is improved, and the uniformity of the balanced single battery is better.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is a schematic diagram of a hardware environment for an alternative control method for full-time equalization of batteries, according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram illustrating an alternative method for controlling full-time cell balancing according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating an alternative method for controlling full-time equalization of a battery according to an embodiment of the present application;
FIG. 4 is a block diagram of an alternative control arrangement for full time cell equalization according to an embodiment of the present application;
fig. 5 is a block diagram of an alternative electronic device according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all 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 application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to one aspect of the embodiment of the application, a control method for full-time equalization of a battery is provided. Alternatively, in the present embodiment, the control method for full-time battery equalization described above may be applied to a hardware environment formed by the terminal 102 and the server 104 as shown in fig. 1. As shown in fig. 1, the server 104 is connected to the terminal 102 through a network, which may be used to provide services for the terminal or a client installed on the terminal, may be provided with a database on the server or independent from the server, may be used to provide data storage services for the server 104, and may also be used to handle cloud services, and the network includes but is not limited to: the terminal 102 is not limited to a PC, a mobile phone, a tablet computer, etc. the terminal may be a wide area network, a metropolitan area network, or a local area network. The control method for full-time battery equalization in the embodiment of the present application may be executed by the server 104, or may be executed by the terminal 102, or may be executed by both the server 104 and the terminal 102. The terminal 102 may execute the control method for battery full-time balancing according to the embodiment of the present application by a client installed thereon.
As mentioned in the background, the adoption of the resistor with a larger resistance value can reduce the equalizing current in the circuit, further reduce the temperature rise, and has better equalizing heat dissipation effect but longer equalizing time. The preset equalization time is obtained by calculating in advance according to information such as the type of a battery pack, the equalization capability of an equalization circuit, the capacity of a battery needing equalization and the like, because the voltage difference of a voltage charging and discharging curve platform area of the monomer of the lithium iron phosphate battery is not obvious, and when the battery is also unstable in voltage due to polarization and other influences in the charging and discharging stages, most of the passive equalization charging equalization is selected as the last charging stage, the inconsistency of the monomers of the battery is most obvious at the moment, but the last charging stage time is short and cannot meet the preset equalization time, and the equalization is carried out at the full time of the equalization in the charging stage and the equalization in the non-charging stage so as to meet the preset equalization time. The full-time equalization cannot be afraid of judging that the equalization monomers are effective equalization in the equalization process, and error equalization is easy to cause. Based on the inventor proposes a control method for full-time battery equalization, taking the terminal 102 and/or the server 104 to execute the control method for full-time battery equalization in this embodiment as an example, fig. 2 is a schematic flow chart of an optional control method for full-time battery equalization according to an embodiment of the present application, and as shown in fig. 2, the flow chart of the method may include the following steps:
step S202, obtaining the stable time periods of the battery in the preset stable state in different stages.
And S204, determining the state of the battery cell in the stable time period.
And S206, determining whether to adjust an equalization program based on the battery cell state.
Through the steps S202 to S206, in consideration of the heat dissipation problem of the balancing resistor, in order to prevent thermal runaway caused by excessive heat generation and large hardware temperature rise, a resistor with a large resistance value is used for passive balancing. Because the equalization time length is calculated according to the resistance value of the equalization resistor, the equalization time required by passive equalization of the large resistance value is long, and the equalization time cannot be met only by equalization in the charging stage. Therefore, the effective balancing individuals are selected in the time period when the battery performance tends to be stable, and the balancing program is updated. The battery can be balanced in the standing stage, the discharging stage and the charging stage, the starting time of a balancing program is prolonged, the temperature rise is reduced, effective full-time balancing is carried out, the efficiency is improved, and the uniformity of the balanced single battery is better.
For the technical solution in step S202, the stable time periods when the battery is in the preset stable state in different stages are obtained. The battery has a charging stage, a standing stage and a discharging stage, the balancing function is that in the charging and discharging stage, the battery with smaller capacity in the battery pack is easy to be overcharged and overdischarged, so that the service life of the battery monomer is shortened, the service life of the whole battery pack is influenced, and by enabling the current voltages of the monomer batteries to tend to be consistent, when the balancing is realized, the total voltage can be used as a sign for stopping charging. The equalization refers to voltage equalization, but the voltage cannot linearly reflect the change of the battery capacity, so the equalization finally only achieves the consistency of the voltages of all the batteries close to each other but not the consistency of the battery capacities, on the other hand, even if the capacities are the same, the charging and discharging characteristics of the batteries are not completely consistent, and the inconsistency of the equalization is caused. Because the battery voltage is influenced by factors such as polarization and the like, the battery voltage has instability, and invalid equalization can occur in the battery equalization single body detected in equalization, so that the condition of wrong equalization is caused. In order to ensure that all the monomers balanced by full-time balance are effectively balanced, the moment when the voltage changes more stably in the charging stage, the standing stage and the discharging stage is selected, and at the moment, the voltage and the capacity have better linear relation.
For the solution in step S204, the cell state is determined in the stable period. According to the characteristics of the lithium iron phosphate battery, when the charging current is small in the final stage of charging, the influence of polarization on the single battery is small, the current voltage of the single battery can well reflect the capacity characteristics of the single battery, the most accurate single battery needing to be balanced can be screened out, and the single battery is prevented from being balanced in a wrong mode in full-time balancing.
With respect to the technical solution in step S206, it is determined whether to adjust the equalization program based on the cell state. The method comprises the steps of calculating in advance according to information such as battery pack types, equalization capacity of an equalization circuit and battery capacity needing equalization to obtain preset equalization time, carrying out equalization at the full time of a battery charging stage, a standing stage and a charging stage, starting full-time equalization, screening out battery monomers needing equalization according to needs to update a program of the full-time equalization, judging whether to replace an equalization object or not, and restarting timing for equalization.
For example, the battery may be referred to as a single battery, and the battery may be any battery capable of providing electric power to the motor, such as a nickel cadmium battery, a nickel hydrogen battery, a lithium ion battery, a lithium polymer battery, and a lead-acid battery. The equalization resistance may be, for example, a carbon film resistance, a metal film resistance, a wire wound resistance, a non-inductive resistance, a thin film resistance, or the like.
As an exemplary embodiment, since the voltage difference of the voltage charging and discharging curve plateau region of the lithium iron phosphate battery cell is not obvious and the polarization characteristic affects the voltage change to be unstable, in order to obtain the time when the voltage and the capacity have a better linear relationship, the time when the voltage difference is obvious and stable needs to be selected, for example, referring to fig. 3, the obtaining of the stable period when the battery is in the preset stable state in different stages includes:
s302, battery electric energy parameters are obtained.
S304, judging whether the electric energy parameter meets a first preset electric energy parameter range.
S306, when the electric energy parameter meets a first preset electric energy parameter range, determining that the battery enters the stable time period.
For the technical solution in step S302, a battery power parameter is obtained. Illustratively, a voltage value and a current value in the charging process of the lithium iron phosphate battery are selected as electric energy parameters of the battery. The voltage value and the current value can reflect the characteristics of the battery and judge whether the battery is stable.
For the technical solution in step S304, it is determined whether the electric energy parameter satisfies a first preset electric energy parameter range. The method comprises the steps of taking a voltage value of a battery and a current value of the battery as electric energy parameters, taking the current value and the voltage value of the battery in a stable state as preset values, namely a first preset electric energy parameter range, comparing the current value and the voltage value of the battery in a current state with the preset voltage value and current value, judging whether the current value and the voltage value are in the first preset electric energy parameter range, and determining whether the current battery is in the stable state.
For the technical solution in step S306, when the electric energy parameter satisfies a first preset electric energy parameter range, it is determined that the battery enters the stable time period. Illustratively, a voltage value and a current value in a lithium iron phosphate battery charging process are selected as electric energy parameters of the battery. The method comprises the steps that a voltage value of a battery at the moment when the voltage of the battery exceeds the characteristics of the battery at a platform corner point, namely the last stage of battery charging, of which the voltage and the capacity of a battery monomer have a better linear corresponding relation is used as a preset voltage, a current value is used as a preset current, the preset voltage and the preset current are used as a first preset electric energy parameter range, detected electric energy parameters in the current state are compared with the first preset electric energy parameters, and when the current voltage value is larger than the preset voltage and the current is smaller than the preset current, the battery is determined to enter a stable period.
Through the steps S302 to S306, the stable time period of the battery can be screened out, the voltage difference obtained in the time period is obvious and stable, the single batteries which are balanced all the time are effectively balanced, and the error balance is prevented.
The cell balancing is to make the cell consistency of the battery higher, and the cell consistency is related to the health condition of the battery. The consistency of the new battery monomer is good, and after the new battery monomer is used for a period of time, the battery is aged, and the inconsistency is obvious. Therefore, the procedure of full time equalization also needs to be adjusted according to the battery health.
Illustratively, before the obtaining the battery power parameter, the method comprises: judging whether the battery is in a preset health state or not; and when the battery is in a preset health state, entering the acquisition of battery electric energy parameters. The battery health threshold is set as a parameter of the capacity state and the internal resistance state. When the health state of the battery exceeds the health threshold value, the health state of the battery is considered to be better, and the consistency of the battery monomer is more ideal. At the moment, the time required by battery equalization is short, the number of battery monomers required for equalization is small, the battery is judged in a stable state only in the last charging stage, and whether equalization programs need to be updated for equalization is judged.
As a further embodiment, when the health state is below the preset health threshold, it is considered that the battery is aged, at this time, the number of balancing cells needed by the battery is large, the balancing time needed is long, the full-time balancing time is too long, and in order to ensure the accuracy of balancing, the time for judging whether to update the balancing program needs to be increased. When the battery is in a non-preset state of health and the battery is in a non-charging phase, the obtaining the stable time period when the battery is in a preset stable state in different phases comprises: judging whether the duration of the non-charging stage is longer than a preset duration and whether the electric energy parameter is within a second preset electric energy parameter range; and when the duration of the non-charging stage is greater than a preset duration and the electric energy parameter is within a second preset electric energy parameter range, determining that the battery enters the stable time period. Increasing the time length for judging whether the equalization program is updated or not, selecting a stage in which the battery is in a stable state in a non-charging stage, taking a voltage value and a current value in the stable stage as a second preset electric energy parameter range, acquiring the voltage value and the current value at the current moment, and judging whether the current value and the voltage value are in the second preset electric energy parameter range or not by comparing the current value and the voltage value in the stable stage. The battery is in an unstable state due to fluctuation of current between power-on and power-off moments, so that the battery needs to be fully placed in order to obtain the time period of the stable state of the battery, the time period of the full placement is used as preset time period, the time period of the battery in the second preset electric energy parameter range is exceeded the preset time period, and the time period of the stable state of the battery in the standing stage can be obtained.
As an exemplary embodiment, the battery comprises a charging stage, a standing stage and a discharging stage, when the battery is healthy, only the battery steady state time period in the charging stage is needed to judge whether to update the equalization program; when the battery is aged, a judgment step needs to be added in the stable state time period of the battery in a non-charging stage, the non-charging stage comprises a standing stage and a discharging stage, the battery is determined whether to enter the stable state or not in the discharging stage by comparing with a preset electric energy parameter, and the standing stage needs the standing time to meet the preset standing time.
In the process of full-time equalization of the battery, because the battery is influenced by polarization and the like, whether the equalized monomer is effective or not cannot be determined in time, and error equalization is easily caused, so that the equalized monomer needs to be screened in a time period when the battery is in a stable state, an equalization program of full-time equalization is adjusted in time, and equalization efficiency is improved.
Illustratively, determining the cell state during the stabilization period includes: acquiring a minimum cell voltage value in the current battery cell; comparing the voltage values of all the single batteries with the minimum single voltage value in sequence; and taking the single battery with the voltage difference with the minimum single voltage value larger than a preset value as a single battery to be balanced. The battery equalization is to improve the consistency among the battery monomers, and the internal structure, the material and the like of each battery monomer are not completely consistent in the manufacturing process, so that the parameters of the capacity, the internal resistance, the voltage and the like of each battery monomer are not completely consistent, the aging condition is not completely consistent, and the battery pack characteristics are limited by the low-voltage minimum capacity monomer. The method comprises the steps of obtaining voltage values of all battery cells in a time period when the battery is in a stable state, selecting the minimum voltage value of all the battery cells as a comparison object, sequentially comparing the voltage values of all the battery cells with the comparison object, presetting voltage difference which can be 20mv, judging the battery cells to be balanced when the voltage difference with the minimum voltage value exceeds 20mv, screening more and more accurate cells needing to be balanced, and balancing all the time in a full-time balancing process.
As an exemplary embodiment, the full-time equalization process may occur with ineffective equalization or over-equalization, and therefore, the procedure of adjusting the full-time equalization is performed during a period in which the battery is in a steady state, and the determining whether to adjust the equalization procedure based on the cell state includes: acquiring a battery monomer of a current execution balancing program; judging whether the battery monomer to be equalized is consistent with the battery monomer of the currently executed equalizing program; and when the battery monomer to be balanced is inconsistent with the battery monomer currently executing the balancing program, replacing the battery monomer to be balanced with the battery monomer executing the balancing program. Accurately positioning a battery monomer to be balanced by screening batteries in a stable state time period, starting balancing according to the fact that the screened battery monomer to be balanced enters a balancing program for timing, judging the battery monomer to be balanced and the battery monomer executing the balancing program when the balancing program is executed currently, and if the battery monomer to be balanced and the battery monomer executing the balancing program are consistent, continuing to execute balancing according to a program at the last moment and continuing balancing timing; if the current time is inconsistent with the preset time, the battery monomer is replaced, the battery monomer to be balanced is used as an object to restart the balancing and the timing is cleared, and the timing is restarted at the current time.
As an exemplary embodiment, the equalization program is started to be executed after the battery is powered on, full-time equalization is performed, and the equalization is restarted after updating when a signal for updating the equalization program is acquired; when the battery is powered on and does not acquire a signal for updating the equalization program, the equalization program of the previous time is executed. And after the battery is powered off, if the driving cycle does not reach the preset time of the balance, storing the program state, and if the driving cycle reaches the preset time of the balance, timing, resetting and storing the state. In the process of executing the balance, detecting whether the battery meets at least one condition of a fault state, whether the temperature of the single battery exceeds a first preset temperature, whether the temperature of the balance resistor exceeds a second preset temperature and whether the temperature of the balance chip exceeds a third preset temperature in real time, if the fault occurs or the temperature value is not in the working range and the battery is damaged, quitting the balance, and storing the current balance timing; and after the balance is continuously timed to the preset balance time, the balance is quitted, and the balance timing is cleared and then stored.
For example, taking a lithium iron phosphate battery as an example, different screening conditions are adopted according to the battery health state, and when the battery health state exceeds a health threshold, the battery health state is considered to be better, and the consistency is more ideal. Judging the screening condition of the balance monomers only at the final stage of charging; when the battery state of health is below the threshold, the battery is considered to be aged, and the determination of the equilibrium cell screening condition may be performed at the end of discharge in addition to the end-of-charge screening. Firstly, the normal state of the battery is judged, whether the battery has faults or not is detected, and whether the temperature change of equalization related hardware is in a normal working range or not is detected. The faults comprise monomer voltage overlow, battery pack voltage overlow, discharge current overrun, sensor abnormity and the like; the temperature detected in the equalization process comprises monomer temperature, equalization resistance temperature and equalization chip temperature. And when no fault exists and the detected temperature values are within the corresponding working ranges, judging the voltage, the current and the differential pressure of all the monomers. When the health state of the battery is good, screening the balance monomer is only carried out at the final stage of charging. The voltage of the monomer is required to exceed the inflection point of the platform area of the characteristics of the lithium iron phosphate battery at the final charging stage, and after the voltage of the monomer exceeds the inflection point, the voltage and the capacity of the monomer have a better linear corresponding relation, so that the most accurate monomer needing to be balanced can be screened out. All the cell voltages are required to be greater than a preset voltage threshold value of a charging equalization inflection point; due to the characteristics of the lithium iron phosphate battery, when the charging current is small in the final stage of charging, the influence of monomer polarization is small, the current voltage of the monomer can well reflect the capacity characteristic of the monomer, and the charging current is required to be smaller than the preset charging equalization current threshold; when the conditions are met, all the monomers with the voltage more than or equal to 20mv higher than the minimum monomer voltage are selected, all the monomers needing to be balanced in the charging stage are obtained by screening, and balancing instructions of the screened balancing monomers are set and stored in a memory. And meanwhile, a first screening value for whether the charging process screening balance monomer condition is met is obtained.
And when no fault exists and the detected temperature values are within the corresponding working ranges, judging the voltage, the current and the differential pressure of all the monomers. After the battery is aged and fully stands or continues to have small current, the current voltage can be considered to better react with the capacity characteristics of the monomer.
The time interval between the current power-on and the last power-off needs to be greater than or equal to a preset sufficient standing time threshold, and the continuous small current time needs to be greater than or equal to a preset continuous small current time threshold. And simultaneously, the battery current is required to be smaller than a preset non-charging equalization current threshold value. If the conditions meet the requirement that the most accurate monomers needing to be screened out need to be balanced, the inflection point of the platform area of the characteristics of the lithium iron phosphate battery is required to be exceeded in the final stage of discharge, and at the moment, the voltage of all the monomers is larger than the preset non-charging balancing voltage threshold value. When the conditions are met, all the monomers with the voltage more than or equal to 20mv higher than the minimum monomer voltage are selected, all the monomers needing to be balanced in the non-charging stage are obtained through screening, and balancing instructions of the screened balancing monomers are set and stored in a memory. And simultaneously obtaining a second screening value which is whether the condition of screening the balance monomer is met or not by fully standing in the non-charging process and a third screening value which is whether the condition of screening the balance monomer is met or not in the low-current working process.
And when any one of the first screening value, the second screening value and the third screening value is established, the balance opening mark is set to be opened. And acquiring the balance instruction again, wherein the balance instruction is that the multidimensional variables correspond to the battery monomers one to one, the balance instruction of the screened characteristic monomer is on, and otherwise, the balance instruction is off. After the balance opening mark is set, the current driving circulation screening condition is not judged. The multidimensional equalization instructions are stored in memory while the equalization timing time is reset to zero.
As an exemplary embodiment, the method selects a passive equalization mode to equalize the battery, wherein the equalization resistor is a resistor with a large resistance value, and since the equalization duration is calculated according to the resistance value of the equalization resistor, the equalization time required by the passive equalization of the large resistance value is long, and the equalization cannot meet the equalization time only during the charging process, effective equalization individuals are selected in a time period when the battery performance tends to be stable, an equalization program is updated, and the equalization efficiency is improved, so that the uniformity of the equalized single cells is better.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required for this application.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present application or portions contributing to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, an optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the method described in the embodiments of the present application.
According to another aspect of the embodiment of the application, a control device for implementing the full-time equalization of the battery is also provided. Fig. 4 is a schematic diagram of an alternative control method and apparatus for full-time battery equalization according to an embodiment of the present application, and as shown in fig. 4, the apparatus may include:
an obtaining module 402 is configured to obtain a stable time period when the battery is in a preset stable state in different stages.
A determination module 406 to determine the cell state during the stabilization period.
An adjusting module 406, configured to determine whether to adjust the balancing procedure based on the cell status.
It should be noted that the obtaining module 402 in this embodiment may be configured to execute the step S202, the identifying module 404 in this embodiment may be configured to execute the step S204, and the result analyzing module 406 in this embodiment may be configured to execute the step S206.
It should be noted here that the modules described above are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above embodiments. It should be noted that the modules described above as a part of the apparatus may be operated in a hardware environment as shown in fig. 1, and may be implemented by software, or may be implemented by hardware, where the hardware environment includes a network environment.
According to another aspect of the embodiments of the present application, there is also provided an electronic device for implementing the control method for full-time battery equalization, where the electronic device may be a server, a terminal, or a combination thereof.
Fig. 5 is a block diagram of an alternative electronic device according to an embodiment of the present application, as shown in fig. 5, including a processor 502, a communication interface 504, a memory 506, and a communication bus 508, where the processor 502, the communication interface 504, and the memory 506 are communicated with each other via the communication bus 508, and where,
a memory 506 for storing a computer program;
the processor 502, when executing the computer program stored in the memory 506, implements the following steps:
acquiring a stable time period when the battery is in a preset stable state in different stages;
determining a cell state during the stabilization period;
determining whether to adjust an equalization procedure based on the cell state.
Alternatively, in this embodiment, the communication bus may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but that does not indicate only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The memory may include RAM, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory. Alternatively, the memory may be at least one memory device located remotely from the processor.
As an example, as shown in fig. 5, the memory 502 may include, but is not limited to, the obtaining module 402, the determining module 404, and the adjusting module 406 in the control apparatus for full-time battery equalization. In addition, other module units in the control device for full-time battery equalization may also be included, which is not described in this example again.
The processor may be a general-purpose processor, and may include but is not limited to: a CPU (Central Processing Unit), an NP (Network Processor), and the like; but also a DSP (Digital Signal Processing), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment is not described herein again.
It can be understood by those skilled in the art that the structure shown in fig. 5 is only an illustration, and the device implementing the control method for full-time battery balancing may be a terminal device, and the terminal device may be a terminal device such as a smart phone (e.g., an Android phone, an iOS phone, etc.), a tablet computer, a palm computer, a Mobile Internet Device (MID), a PAD, and the like. Fig. 5 is a diagram illustrating a structure of the electronic device. For example, the terminal device may also include more or fewer components (e.g., network interfaces, display devices, etc.) than shown in FIG. 5, or have a different configuration than shown in FIG. 5.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by a program instructing hardware associated with the terminal device, where the program may be stored in a computer-readable storage medium, and the storage medium may include: flash disk, ROM, RAM, magnetic or optical disk, and the like.
According to still another aspect of an embodiment of the present application, there is also provided a storage medium. Alternatively, in the present embodiment, the storage medium may be used to execute a program code of a control method of full-time battery equalization.
Optionally, in this embodiment, the storage medium may be located on at least one of a plurality of network devices in a network shown in the above embodiment.
Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps:
acquiring a stable time period when the battery is in a preset stable state in different stages;
determining a cell state during the stabilization period;
determining whether to adjust an equalization procedure based on the cell state.
Optionally, the specific example in this embodiment may refer to the example described in the above embodiment, which is not described again in this embodiment.
Optionally, in this embodiment, the storage medium may include but is not limited to: various media capable of storing program codes, such as a U disk, a ROM, a RAM, a removable hard disk, a magnetic disk, or an optical disk.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
The integrated unit in the above embodiments, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in the above computer-readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a storage medium, and including instructions for causing one or more computer devices (which may be personal computers, servers, network devices, or the like) to execute all or part of the steps of the method described in the embodiments of the present application.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed client may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, and may also be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution provided in the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A method for controlling full time equalization of a battery, said battery comprising a charging phase and a non-charging phase, said method comprising:
acquiring a stable time period when the battery is in a preset stable state in different stages;
determining a cell state during the stabilization period;
determining whether to adjust an equalization procedure based on the cell state.
2. The method for controlling full-time equalization of batteries according to claim 1, wherein said obtaining the stable time period that the battery is in the preset stable state in different stages comprises:
acquiring battery electric energy parameters;
judging whether the electric energy parameter meets a first preset electric energy parameter range or not;
and when the electric energy parameter meets a first preset electric energy parameter range, determining that the battery enters the stable time period.
3. The method for controlling full-time equalization of batteries according to claim 2, wherein before said obtaining battery power parameters, it comprises:
judging whether the battery is in a preset health state or not;
and when the battery is in a preset health state, entering the acquisition of battery electric energy parameters.
4. The control method for full-time equalization of batteries according to claim 3, wherein when said battery is in a non-preset state of health and said battery is in a non-charging phase;
the acquiring the stable time period of the battery in the preset stable state in different stages comprises:
judging whether the duration of the non-charging stage is longer than a preset duration and whether the electric energy parameter is within a second preset electric energy parameter range;
and when the duration of the non-charging stage is greater than a preset duration and the electric energy parameter is within a second preset electric energy parameter range, determining that the battery enters the stable time period.
5. The method for controlling full-time equalization of batteries according to claim 4, characterized in that said non-charging phase comprises a rest phase and/or a discharging phase.
6. The method for controlling full time equalization of batteries according to claims 1-5, wherein said determining the cell state in said stable period of time comprises:
acquiring a minimum cell voltage value in the current battery cell;
comparing the voltage values of all the single batteries with the minimum single voltage value in sequence;
and taking the single battery with the voltage difference with the minimum single voltage value larger than a preset value as a single battery to be balanced.
7. The method for controlling full-time equalization of batteries according to claim 6, wherein said determining whether to adjust an equalization program based on said cell status comprises:
acquiring a battery monomer of a current execution balancing program;
judging whether the battery monomer to be equalized is consistent with the battery monomer of the currently executed equalizing program;
and when the battery monomer to be equalized is inconsistent with the battery monomer currently executing the equalization program, replacing the battery monomer to be equalized with the battery monomer executing the equalization program.
8. The method for controlling full-time equalization of batteries according to claim 1, further comprising:
judging whether the battery meets at least one condition of a fault state, whether the temperature of the single battery exceeds a first preset temperature, whether the temperature of the equalizing resistor exceeds a second preset temperature and whether the temperature of the equalizing chip exceeds a third preset temperature;
and when the balance state is satisfied, exiting the balance program.
9. The method of claim 7 for controlling full time equalization of a battery, said battery including equalization resistors,
when the battery cell to be equalized is consistent with the battery cell currently executing the equalizing program, the battery exits the equalizing program after the equalizing program is executed for a preset time;
the preset duration is determined based on the resistance value of the equalizing resistor.
10. An electronic device comprising a processor, a communication interface, a memory and a communication bus, wherein said processor, said communication interface and said memory communicate with each other via said communication bus,
the memory for storing a computer program;
the processor configured to execute the steps of the control method for full-time battery equalization according to any one of claims 1 to 9 by executing the computer program stored in the memory.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115123018A (en) * | 2022-07-25 | 2022-09-30 | 潍柴动力股份有限公司 | Pure electric mode torque-limiting control method and device for vehicle, electronic equipment and medium |
| CN117559613A (en) * | 2024-01-11 | 2024-02-13 | 西安奇点能源股份有限公司 | Energy balance early warning control system of series lithium battery pack |
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2022
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115123018A (en) * | 2022-07-25 | 2022-09-30 | 潍柴动力股份有限公司 | Pure electric mode torque-limiting control method and device for vehicle, electronic equipment and medium |
| CN117559613A (en) * | 2024-01-11 | 2024-02-13 | 西安奇点能源股份有限公司 | Energy balance early warning control system of series lithium battery pack |
| CN117559613B (en) * | 2024-01-11 | 2024-03-19 | 西安奇点能源股份有限公司 | Energy balance early warning control system of series lithium battery pack |
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