CN112092678A - Driving balancing method, device and system - Google Patents
Driving balancing method, device and system Download PDFInfo
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- CN112092678A CN112092678A CN202010771255.3A CN202010771255A CN112092678A CN 112092678 A CN112092678 A CN 112092678A CN 202010771255 A CN202010771255 A CN 202010771255A CN 112092678 A CN112092678 A CN 112092678A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
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- 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 driving equalization method, a driving equalization device and a driving equalization system, wherein the method comprises the steps of obtaining a current signal output by a battery management system of a vehicle, and a difference value between each cell voltage signal and a minimum cell voltage signal; judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal; and when the fluctuation degree meets the set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started. The battery balancing method and the battery balancing system can be suitable for the battery balancing function in the driving process, effectively improve the applicability of the balancing method, and ensure the balance sufficiency among the battery cores of the battery management system, thereby prolonging the service efficiency and the service life of the battery.
Description
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to a driving balancing method, device, and system.
Background
In the manufacturing process of the battery core, parameter values such as capacity, internal resistance and voltage of the battery cores of the same model which are delivered from the factory in the same batch have certain differences due to non-uniform materials and process treatment, after the battery cores are used in groups, a barrel short plate effect is easy to occur due to manufacturing differences, so that the battery core with the minimum capacity is easy to be overcharged during charging, and the battery with the minimum capacity is easy to be overdischarged during discharging, so that the damaged capacity of the battery with the minimum capacity becomes smaller, and the service life of the battery is shortened due to going into a vicious circle. In order to avoid the occurrence of overcharge and overdischarge, the balance function between the battery cores for prolonging the service efficiency and the service life of the battery is particularly important.
In the related technology, a voltage difference method and a capacity difference method are usually adopted to realize the balance function among the battery cells, and the capacity difference method has high requirement on the accuracy of the calculation of the battery cell capacity, so that the calculation of the percentage accuracy of the battery cell capacity is difficult to ensure; the voltage difference method has a high requirement on the accuracy of the voltage, but the accuracy of the voltage acquired by the sensor under appropriate conditions is more reliable than the accuracy of the calculated capacity. Particularly, in the constant current charging stage, the cell monomer voltage acquired through the AFE completely meets the precision required by the balance.
When the scheme is applied to the driving process, due to certain fluctuation of current, the voltage of the cell monomer is difficult to ensure the consistency of real-time performance when the current fluctuation is large, so that the judgment of the conditions for starting and exiting the cell is difficult, and the balance is triggered by mistake.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present application is to provide a driving balancing method, device and system, which can be applied to a battery balancing function in a driving process, effectively improve the applicability of the balancing method, and ensure the sufficiency of balancing among battery cells of a battery management system, thereby prolonging the service efficiency and the service life of the battery.
In order to achieve the above object, an embodiment of the present application provides a driving balance method, including: acquiring a current signal output by a battery management system of a vehicle, and a difference value between each cell voltage signal and a minimum cell voltage signal; judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal; and when the fluctuation degree meets a set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started.
According to the driving equalization method provided by the embodiment of the first aspect of the application, a current signal output by a battery management system of a vehicle, and a difference value between each cell voltage signal and a minimum cell voltage signal are obtained; judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal; when the fluctuation degree meets the set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started, so that the method can be suitable for the balance function of the battery in the driving process, the applicability of the balance method is effectively improved, the balance sufficiency among the battery cores of the battery management system is ensured, and the service efficiency and the service life of the battery are prolonged.
In order to achieve the above object, an embodiment of the second aspect of the present application provides a driving balance device, including: the acquisition module is used for acquiring a current signal output by a battery management system of a vehicle, and a difference value between each cell voltage signal and the minimum cell voltage signal; the permission module is used for judging whether the balance function of the battery management system is permitted to be started or not according to the fluctuation degree of the current signal; and the starting module is used for allowing the balancing function of the battery management system to be started when the fluctuation degree meets the set condition, and starting the balancing function of the battery management system when the difference value meets the set condition.
In the driving equalization device provided in the embodiment of the second aspect of the present application, a current signal output by a battery management system of a vehicle, and a difference between each cell voltage signal and a minimum cell voltage signal are obtained; judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal; when the fluctuation degree meets the set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started, so that the method can be suitable for the balance function of the battery in the driving process, the applicability of the balance method is effectively improved, the balance sufficiency among the battery cores of the battery management system is ensured, and the service efficiency and the service life of the battery are prolonged.
In order to achieve the above object, an embodiment of the third aspect of the present application provides a driving balance system, including: the embodiment of the second aspect of the present application provides a driving balance device.
In the driving equalization system provided in the embodiment of the third aspect of the present application, a current signal output by a battery management system of a vehicle, and a difference between each cell voltage signal and a minimum cell voltage signal are obtained; judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal; when the fluctuation degree meets the set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started, so that the method can be suitable for the balance function of the battery in the driving process, the applicability of the balance method is effectively improved, the balance sufficiency among the battery cores of the battery management system is ensured, and the service efficiency and the service life of the battery are prolonged.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
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The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a driving balance method according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a driving balance method according to another embodiment of the present application;
fig. 3 is a schematic flow chart of a driving balance method according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a driving balance device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a driving balance system according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Fig. 1 is a schematic flow chart of a driving balance method according to an embodiment of the present application.
The present embodiment is exemplified by the case where the driving balance method is configured as a driving balance device.
The driving balance method in this embodiment may be configured in a driving balance device, and the driving balance device may be disposed in a vehicle, specifically, may be disposed in a battery management system, or may also be disposed in a vehicle-mounted device, which is not limited in this embodiment of the present application.
The present embodiment takes the case where the driving balance method is configured in the battery management system.
Referring to fig. 1, the method includes:
s101: and acquiring a current signal output by a battery management system of the vehicle, and a difference value between each cell voltage signal and the minimum cell voltage signal.
In some embodiments, the current signal output by the battery management system of the vehicle may be obtained in real time, or the current signal output by the battery management system of the vehicle may also be obtained at a set time point, which is not limited herein.
In other embodiments, a current detector may be configured for the battery management system, and the current detector detects and obtains a current signal output by the battery management system of the vehicle, or the battery management system may be connected to the vehicle-mounted device, and a corresponding application program in the vehicle-mounted device detects and obtains the current signal output by the battery management system, which is not limited to this.
In the embodiment of the application, the battery management system can be further obtained, and the current signals output by the battery management system at a plurality of time points before the current time point are obtained, so that the follow-up determination of the fluctuation degree of the current signals according to the current signals corresponding to the time points is assisted, and the determination of the fluctuation degree of the current signals can be effectively assisted.
In the embodiment of the application, when obtaining the difference between each cell voltage signal of the battery management system of the vehicle and the minimum cell voltage signal, specifically, each cell voltage signal may be obtained first, and then, the difference between each cell voltage signal and the minimum cell voltage signal may be determined, that is, there is a corresponding difference for each cell.
As an example, a difference between an nth cell voltage signal and a minimum cell voltage signal is obtained, where n is a serial number of each battery cell included in the battery management system, n is greater than or equal to 1 and is less than or equal to the total number of the battery cells, a difference (Vn-Vmin) between the nth cell voltage signal (Vn) and the minimum cell voltage signal (Vmin) may be specifically obtained, and a subsequent time for starting an equalization function of the battery management system may be assisted according to the difference (Vn-Vmin).
S102: and judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal.
The degree of fluctuation of the current signal described above can represent a situation in which the current fluctuates over a period of time.
When the battery management system is obtained, the signal variance or the signal standard deviation can be determined according to the current signals corresponding to the current points and output corresponding to the current points before the current point, and the signal variance or the signal standard deviation is used as the fluctuation degree, so that the fluctuation degree of the current signals can be rapidly determined, extra hardware transformation cost can not be brought, the realization is simple and convenient, the referential property is high, and the equalization effect is ensured.
In other embodiments, any other possible method may be adopted to determine the fluctuation degree of the current signal according to the current signal, such as a modeling method, an engineering method, and the like, without limitation.
S103: and when the fluctuation degree meets the set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started.
In some embodiments, when the signal variance or the signal standard deviation is taken as the fluctuation degree, if the signal variance is smaller than the variance threshold, the equalization function of the battery management system is allowed to be started; or if the standard deviation of the signal is smaller than the standard deviation threshold, the equalization function of the battery management system is allowed to be started, and the most appropriate time for starting the equalization function of the battery management system can be quickly determined, so that the equalization function is enabled to be normally started, and false triggering of the equalization function caused by current fluctuation in the driving process is avoided.
When the fluctuation degree meets the set condition, after the balance function of the battery management system is allowed to be started, the time for starting the balance function of the battery management system is determined according to the difference value of each cell voltage signal and the minimum cell voltage signal, so that the current fluctuation condition in the driving process and the actual voltage condition of each cell in the battery management system are jointly used as the time for starting the balance function.
As an example, when the difference (Vn-Vmin) between the nth cell voltage signal (Vn) and the minimum cell voltage signal (Vmin) is greater than the calibrated value (Vin) of the start equalization control voltage difference, the equalization function of the battery management system is started, and the current fluctuation condition and the actual voltage condition of each cell in the battery management system during driving are jointly used as the starting time of the equalization function, so that the determined starting time can take the current fluctuation condition and the actual voltage condition into account, and the driving equalization method has higher practicability.
As a specific example, referring to fig. 2, fig. 2 is a schematic flow chart of a driving balance method according to another embodiment of the present application, where fig. 2 includes:
s201: and collecting a current signal I.
S202: variance S2 of the N current sample points.
S203: a determination is made as to whether the variance S2 is less than a nominal variance value that allows for equalization.
S204: if yes, the balance function of the battery management system is allowed to be started.
S205: and if not, not allowing the balance function of the battery management system to be started.
For the above fig. 2, the current signal I is detected, and the variance S2 including the current time point and the previous N current sampling points is truncated, and the formula of S2 is as follows:
n represents N current sampling points before the current moment, the quantity is a calibratable quantity, and i is a positive integer from 1 to N; i is a current signal;
is the average of N current sampling points, IiCurrent values of the first to nth sampling points, respectively; and sigma is the accumulation operator.
The magnitude of the variance value (variance threshold) for allowing equalization to be entered may be compared to S2, and when the variance S2 is less than the variance value (variance threshold) for allowing equalization to be entered, the equalization function of the battery management system is allowed to be activated, otherwise the equalization function of the battery management system is not allowed to be activated.
In the embodiment, the current signal output by a battery management system of a vehicle, and the difference value between each cell voltage signal and the minimum cell voltage signal are obtained; judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal; when the fluctuation degree meets the set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started, so that the method can be suitable for the balance function of the battery in the driving process, the applicability of the balance method is effectively improved, the balance sufficiency among the battery cores of the battery management system is ensured, and the service efficiency and the service life of the battery are prolonged.
As another example, referring to the following fig. 3, fig. 3 is a schematic flow chart of a driving balancing method according to another embodiment of the present application, and the step of starting the balancing function of the battery management system may specifically include:
s301: the method comprises the steps of obtaining a current signal output by a battery management system of a vehicle, and obtaining a difference value between an nth cell voltage signal and a minimum cell voltage signal, wherein n is a serial number of each cell included in the battery management system, and is greater than or equal to 1 and less than or equal to the total number of the cells.
S302: and judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal.
S303: and when the fluctuation degree meets the set condition, the equalization function of the battery management system is allowed to be started.
When it is determined that the equalization function of the battery management system is allowed to be started, a difference (Vn-Vmin) between the nth cell voltage signal (Vn) and the minimum cell voltage signal (Vmin) may be specifically obtained, and the timing for subsequently starting the equalization function of the battery management system may be assisted according to the difference (Vn-Vmin).
S304: and if the difference value is greater than the calibration value of the starting equalization control voltage difference, starting the equalization function of the battery management system.
When the difference value (Vn-Vmin) between the nth cell voltage signal (Vn) and the minimum cell voltage signal (Vmin) is greater than the starting balance control voltage difference calibration value (Vin), the balance function of the battery management system is started, the current fluctuation condition in the driving process and the actual voltage condition of each cell in the battery management system are jointly used as the starting time of the balance function, the current fluctuation condition and the actual voltage condition can be considered at the determined starting time, and the driving balance method is more practical.
S305: and if the difference value is less than or equal to the starting equalization control voltage difference calibration value, judging whether the difference value is less than the exiting equalization control voltage difference calibration value or not.
S306: and if the difference value is less than the voltage difference calibration value for quitting the equalization control, closing the equalization function of the battery management system.
S307: and if the difference value is greater than or equal to the voltage difference calibration value for exiting the equalization control, updating the difference value, and judging whether the difference value is greater than the voltage difference calibration value for starting the equalization control again.
If the difference value (Vn-Vmin) between the nth cell voltage signal (Vn) and the minimum cell voltage signal (Vmin) is less than or equal to the starting equalization control voltage difference calibration value (Vin), judging whether the difference value (Vn-Vmin) is less than the exiting equalization control voltage difference calibration value (Vout), if so, closing the equalization function of the battery management system, otherwise, updating the difference value, and judging whether the difference value is greater than the starting equalization control voltage difference calibration value again.
Through the embodiment shown in fig. 3, the current fluctuation situation in the driving process and the actual voltage situation of each battery cell in the battery management system can be jointly used as the opportunity for starting the balancing function, so that the determined starting opportunity can take the current fluctuation situation and the actual voltage situation into consideration, the driving balancing method is more practical, the quitting opportunity can be determined in time, and the resource consumption required by balancing is effectively saved.
In some embodiments, the step S101 may further determine whether the vehicle currently enters the driving balance control mode; if the vehicle enters a driving balance control mode, acquiring a current signal output by a battery management system of the vehicle, if the vehicle is determined not to be powered off or not to be in a sleep state currently and the vehicle is not in a charging state currently, determining that the vehicle enters the driving balance control mode currently, and if the vehicle is determined to be powered off or in the sleep state currently, exiting balance control; or if the vehicle is determined to be in the charging state currently, entering a charging equalization control mode.
The balance control mode which should be entered is selected according to the mode of the vehicle, wherein the balance mode is divided into a driving balance control mode and a charging balance control mode, the balance control is turned off when the vehicle is in a power-off or sleep state, otherwise, the charging state is judged, if the vehicle is in the charging state, the charging balance control mode is entered, and if the vehicle is not in the charging state, the driving balance control mode is entered, so that the driving balance rationality can be effectively guaranteed, the driving balance method in the application is not only suitable for balance in the driving process, but also suitable for balance in the charging state, the balance applicability is effectively improved, and the driving safety of the vehicle is guaranteed.
Fig. 4 is a schematic structural diagram of a driving balance device according to an embodiment of the present application.
Referring to fig. 4, the apparatus 400 includes:
the acquiring module 401 is configured to acquire a current signal output by a battery management system of a vehicle, and a difference value between each cell voltage signal and a minimum cell voltage signal;
an allowing module 402, configured to determine whether to allow starting of a balancing function of the battery management system according to a fluctuation degree of the current signal;
a starting module 403, configured to allow starting of the balancing function of the battery management system when the fluctuation degree satisfies the set condition, and start the balancing function of the battery management system when the difference value satisfies the set condition.
Optionally, in some embodiments, obtaining the current signal output by the battery management system of the vehicle includes:
acquiring current signals which are correspondingly output by a battery management system at a plurality of time points before the current time point;
after obtaining the current signal that the battery management system of vehicle exported, include:
and determining the fluctuation degree of the current signal according to the current signal corresponding to each time point.
Optionally, in some embodiments, determining a fluctuation degree of the current signal according to the current signal corresponding to each time point includes:
determining a signal variance or a signal standard deviation according to the current signals corresponding to the multiple time points;
and taking the signal variance or the signal standard deviation as the fluctuation degree of the current signal.
Optionally, in some embodiments, when the fluctuation degree satisfies the set condition, the method allows starting the balancing function of the battery management system, including:
if the signal variance is smaller than the variance threshold, the equalization function of the battery management system is allowed to be started; or,
and if the standard deviation of the signal is smaller than the standard deviation threshold value, the equalization function of the battery management system is allowed to be started.
Optionally, in some embodiments, when the difference value satisfies the set condition, the starting of the balancing function of the battery management system includes:
and if the difference value is greater than the calibration value of the starting equalization control voltage difference, starting the equalization function of the battery management system.
Optionally, in some embodiments, the method further comprises:
if the difference value is less than or equal to the starting equalization control voltage difference calibration value, judging whether the difference value is less than the quitting equalization control voltage difference calibration value or not;
if the difference value is less than the voltage difference calibration value for quitting the equalization control, the equalization function of the battery management system is closed;
and if the difference value is greater than or equal to the voltage difference calibration value for exiting the equalization control, updating the difference value, and judging whether the difference value is greater than the voltage difference calibration value for starting the equalization control again.
Optionally, in some embodiments, obtaining the current signal output by the battery management system of the vehicle includes:
determining whether the vehicle enters a driving balance control mode at present;
and if the vehicle enters a driving balance control mode, acquiring a current signal output by a battery management system of the vehicle.
Optionally, in some embodiments, determining whether the vehicle currently enters the driving balance control mode further includes:
and if the vehicle is determined not to be powered off or not to be dormant currently and the vehicle is not in a charging state currently, determining that the vehicle enters a driving balance control mode currently.
Optionally, in some embodiments, the method further comprises:
if the current power-off or the sleep of the vehicle is determined, the balance control is quitted; or,
and if the vehicle is determined to be in the charging state currently, entering a charging balance control mode.
It should be noted that the explanation of the embodiment of the driving balance method in the foregoing embodiments of fig. 1 to fig. 3 is also applicable to the driving balance apparatus 400 of this embodiment, and the implementation principle is similar, and is not repeated here.
In the embodiment, the current signal output by a battery management system of a vehicle, and the difference value between each cell voltage signal and the minimum cell voltage signal are obtained; judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal; when the fluctuation degree meets the set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started, so that the method can be suitable for the balance function of the battery in the driving process, the applicability of the balance method is effectively improved, the balance sufficiency among the battery cores of the battery management system is ensured, and the service efficiency and the service life of the battery are prolonged.
Fig. 5 is a schematic structural diagram of a driving balance system according to an embodiment of the present application.
Referring to fig. 5, the system 500 includes:
the driving balance device 400 of the embodiment shown in fig. 4 is described above.
It should be noted that the explanation of the embodiment of the driving balance method in the foregoing embodiments of fig. 1 to fig. 3 is also applicable to the driving balance system 500 of the embodiment, and the implementation principle is similar, and is not repeated here.
In the embodiment, the current signal output by a battery management system of a vehicle, and the difference value between each cell voltage signal and the minimum cell voltage signal are obtained; judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal; when the fluctuation degree meets the set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started, so that the method can be suitable for the balance function of the battery in the driving process, the applicability of the balance method is effectively improved, the balance sufficiency among the battery cores of the battery management system is ensured, and the service efficiency and the service life of the battery are prolonged.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (11)
1. A driving balance method is characterized by comprising the following steps:
acquiring a current signal output by a battery management system of a vehicle, and a difference value between each cell voltage signal and a minimum cell voltage signal;
judging whether the balance function of the battery management system is allowed to be started or not according to the fluctuation degree of the current signal;
and when the fluctuation degree meets a set condition, the balance function of the battery management system is allowed to be started, and when the difference value meets the set condition, the balance function of the battery management system is started.
2. The driving equalization method according to claim 1, wherein the obtaining of the current signal output by the battery management system of the vehicle comprises:
acquiring current signals which are correspondingly output by the battery management system at a plurality of time points before the current time point;
after obtaining the current signal that the battery management system of vehicle exported, include:
and determining the fluctuation degree of the current signal according to the current signal corresponding to each time point.
3. The driving equalization method according to claim 2, wherein the determining the fluctuation degree of the current signal according to the current signal corresponding to each of the time points comprises:
determining a signal variance or a signal standard deviation according to the current signals corresponding to the multiple time points;
and taking the signal variance or the signal standard deviation as the fluctuation degree of the current signal.
4. The driving equalization method according to claim 3, wherein the allowing of the equalization function of the battery management system to be started when the fluctuation degree satisfies a set condition includes:
if the signal variance is smaller than a variance threshold value, the equalization function of the battery management system is allowed to be started; or,
and if the signal standard deviation is smaller than the standard deviation threshold value, the equalization function of the battery management system is allowed to be started.
5. The driving equalization method according to any one of claims 1 to 4, wherein the starting of the equalization function of the battery management system when the difference value satisfies a set condition comprises:
and if the difference value is greater than the calibration value of the starting equalization control voltage difference, starting the equalization function of the battery management system.
6. The driving equalization method according to claim 5, further comprising:
if the difference value is less than or equal to the starting equalization control voltage difference calibration value, judging whether the difference value is less than the exiting equalization control voltage difference calibration value or not;
if the difference value is smaller than the voltage difference calibration value for exiting the equalization control, the equalization function of the battery management system is closed;
and if the difference value is greater than or equal to the voltage difference calibration value for exiting the equalization control, updating the difference value, and judging whether the difference value is greater than the voltage difference calibration value for starting the equalization control again.
7. The driving equalization method according to claim 1, wherein the obtaining of the current signal output by the battery management system of the vehicle comprises:
determining whether the vehicle enters a driving balance control mode at present;
and if the vehicle enters the driving balance control mode, acquiring a current signal output by a battery management system of the vehicle.
8. The vehicle balancing method of claim 7, wherein the determining whether the vehicle is currently entering the vehicle balancing control mode further comprises:
and if the vehicle is determined not to be powered off or not to be dormant currently and the vehicle is not in a charging state currently, determining that the vehicle enters the driving balance control mode currently.
9. The driving equalization method of claim 7, further comprising:
if the current power-off or dormancy of the vehicle is determined, quitting the balance control; or,
and if the vehicle is determined to be in the charging state currently, entering a charging balance control mode.
10. A ride equalizer arrangement, the arrangement comprising:
the acquisition module is used for acquiring a current signal output by a battery management system of a vehicle, and a difference value between each cell voltage signal and the minimum cell voltage signal;
the permission module is used for judging whether the balance function of the battery management system is permitted to be started or not according to the fluctuation degree of the current signal;
and the starting module is used for allowing the balancing function of the battery management system to be started when the fluctuation degree meets the set condition, and starting the balancing function of the battery management system when the difference value meets the set condition.
11. A ride equalization system, the system comprising:
a ride equalizer device as claimed in claim 10.
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Application publication date: 20201218 |