Patent Application
20240410954
The present application relates to the technical field of battery management and in particular to a method, a device, a storage medium and a terminal for estimating the battery capacity.
With the increasing spread of electric vehicles in the market, the demands on the battery performance of electric vehicles are getting higher and higher. As the service life of electric vehicles increases, the batteries that supply the power are getting older, so that the requirements of electric vehicles are no longer met by the battery power. In this case it is important to consider how to deal with the aging battery.
In fact, the power batteries retired from electric vehicles still have sufficient power for other applications, e.g., as large mobile power sources. In contrast to new batteries, however, the decommissioned power batteries still have the following deficiencies as mobile power sources:
The present application provides a method, a device, a storage medium and a terminal device for estimating the battery capacity in order to solve or alleviate one or more technical problems of the prior art.
As one aspect of the embodiments of the present application, an embodiment of the present application provides a method for estimating a battery capacity, comprising:
In one embodiment, the updating of the correlation data according to the measurement voltage of the battery before charging or discharging, the measurement voltage of the battery after charging or discharging, the electric charge change and the correlation data comprises the following steps:
In one embodiment, the method further comprises the following step:
In one embodiment, the determining of a correction voltage of the battery after charging or discharging according to an estimated electric charge of the battery before charging or discharging, an estimated electric charge of the battery after charging or discharging, a measurement voltage of the battery after charging or discharging and an estimated voltage of the battery after charging or discharging comprises:
where Vm indicates the correction voltage of the battery after charging or discharging, V1 indicates the measurement voltage of the battery after charging or discharging, V2 indicates the estimated voltage of the battery after charging or discharging, Q0 indicates the estimated electric charge of the battery before charging or discharging, and Cn indicates the electric charge change.
In one embodiment, the updating of the electric charge in the correlation data according to the estimated electric charge corresponding to the correction voltage in the correlation data, the electric charge change and the estimated electric charge of the battery before charging or discharging comprises the following step:
where Qk′ indicates the charge after the update, Qk indicates the charge before the update, Q0 indicates the estimated electric charge of the battery before charging or discharging, Qm indicates the estimated electric charge corresponding to the correction voltage in the correlation data, and Cn indicates the electric charge change.
In one embodiment, the determination of the battery capacity according to the updated correlation data comprises the following steps:
In one embodiment, the determination of an electric charge change of the battery during charging or discharging comprises the following steps:
As one aspect of the exemplary embodiments of the present application, an exemplary embodiment of the present application provides an apparatus for estimating the battery capacity, which comprises:
In one embodiment, the update module comprises:
As one aspect of the exemplary embodiments of the present application, an exemplary embodiment of the present application provides the following configuration that the structure for estimating a battery capacity comprises a processor and a memory, the memory being used for the determination device of the battery capacity to program the program that corresponds to the above estimation method of the battery capacity, and to execute the correlation data between the voltage and the charge of the battery, wherein the processor is configured to execute the program stored in the memory. The device for determining the battery capacity also comprises a communication interface via which the device for estimating the battery capacity can communicate with other devices or communication networks.
As one aspect of the embodiments of the present application, an embodiment of the present application provides a computer readable storage medium for computer software instructions. The computer software instructions are used by the battery capacity estimator and include a program for performing the battery capacity estimating method.
Using the above technical solution, the embodiment of the present application is able to accurately update the historical data of voltage and electric charge, and effectively evaluate the electric charge of the battery even if the battery ages too quickly.
The above description is for explanation only and does not mean any restrictions. In addition to the schematic aspects, embodiments and features described above, further aspects, embodiments and features of the present application can be readily understood by referring to the figures and the following detailed description.
In the drawings, unless otherwise specified, the same reference numerals refer to the same or similar parts or elements throughout the multiple drawings. The drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present application, and should not be regarded as limiting the scope of the present application.
Only certain exemplary embodiments are briefly described below. As can be recognized by a person skilled in the art, the exemplary embodiments described can be modified in the most varied of ways without departing from the scope or spirit of the application. Accordingly, the accompanying figures and description are to be regarded as exemplary rather than restrictive.
Referring to
The battery can be placed in a mobile power supply or other type of power supply, and the battery can be either a new or an aged battery. When starting a power supply in a mobile power supply or when charging a power supply, the battery voltage is pre-measured, i.e., the measurement voltage of the battery before charging or discharging.
In some exemplary embodiments, the current when charging or discharging the battery is recorded in a short interval t, e.g., the current is recorded with a certain frequency-when charging or discharging. The electric charge flowing in or out of the battery can be calculated within a period of charging or discharging, e.g., n*ti, i=1,2,3, . . . , n by Σi=1nIiti are calculated, where Ii indicates the current detected in the i-th time period, which can be an instantaneous value or an average current value, ti indicates the duration of the i-th time period. The individual time periods can be the same or different.
Mobile power supply can include a variety of batteries. During assembly, each individual battery is tested so that a voltage-charge characteristic is obtained. This characteristic curve indicates that the electric charge varies with the voltage or the voltage varies with the charge. Therefore, such characteristics are used as correlation data for the batteries in this embodiment. In further exemplary embodiments, a set of points is used as correlation data instead of the characteristic curve, e.g., (VxeQx), where Vx specifies the voltage of the xth point in the set of points and Qx specifies the electric charge of the xth point. In further embodiments, the variation in the battery voltage with the electric charge or the variation in the electric charge with the battery voltage can be represented by means of a one-to-one mapping function. The correlation data can be stored in the memory of the mobile power supply and read out by the processor.
In some embodiments, the voltage in the correlation data or the electric charge in the correlation data, even both the voltage and the electric charge in the correlation data, can be updated.
In this exemplary embodiment, the battery capacity is determined by the electric charge difference between the limit voltages. Therefore, the electric charge at the limit voltages is obtained from the updated correlation data. The actual battery capacity is determined according to the difference between the electric charge at the limit voltages.
In this exemplary embodiment, the correlation data are updated as a function of the measured change in voltage and the electric charge change of the battery before and after the charging or discharging of the correlation data and of the historically recorded correlation data. The actual battery capacity is then determined according to the updated correlation data.
In some exemplary embodiments, as shown in
In some exemplary embodiments, the measured voltage of the battery after charging or discharging and the estimated voltage of the battery after charging or discharging are weighted by means of the estimated electric charge of the battery before charging or discharging and the electric charge change of the battery during charging or discharging to determine a correction voltage to maintain the battery after charging or discharging.
In some embodiments, each individual charge in the correlation data since charging and discharging is updated by calculating the ratio between the electric charge change from the estimated electric charge, which corresponds to the corrective voltage of the battery after charging or discharging, to the estimated electric charge before charging or discharging and the actual electric charge change is used.
In some exemplary embodiments, the method based on step S340 further comprises the following step:
It is assumed by way of example that the correction voltage of the battery after charging or discharging is 30 V and the estimated electric charge of the battery is 300 Q after charging or discharging. Then, a corresponding data point such as (33 V, 300 Q) is located in the correlation data according to the estimated electric charge of the battery 300 Q after charging or discharging, and then the 33 V in that data point is updated to 30 V.
In some embodiments, the formula for determining a correction voltage of the battery after charging or discharging according to an estimated electric charge of the battery before charging or discharging, an estimated electric charge of the battery after charging or discharging, a measurement voltage of the battery after charging or discharging, and an estimated voltage of the battery after charging or discharging is:
For example, if Q0 is 100 Q, Cn is 200 Q, V1 is 30V and V2 is 33 V, then the correction voltage of the battery after charging or discharging is:
In this exemplary embodiment, the measurement voltage of the battery after charging or discharging has a greater weight if the electric charge change during charging or discharging is too great. On the other hand, the estimated voltage of the battery after charging or discharging is heavier when the original electric charge during charging or discharging is large, that is, when the estimated electric charge before charging or discharging has a larger value. Therefore, the estimated and measured voltages of the batteries after charging or discharging are weighted averaged according to the electric charge before charging or discharging and the electric charge change during charging or discharging, so that a corrected voltage after charging or discharging is obtained.
In some exemplary embodiments, in step S360 above, the charge can be updated in accordance with the following formula in the correlation data for any electric charge that changes due to the charging or discharging, based on the estimated electric charge of the battery before charging or discharging.
With the change in electric charge is Cn and the voltage drops to Vm, the charge stored in the memory is changed in this embodiment, i.e., the electric charge change Qm−Q0, which varies with the voltage, is recorded in the correlation data. Then there is the ratio of the actual electric charge change to the electric charge change stored in the memory,
At the same time, the actual electric charge change of the data point corresponding to Qk in the correlation data with respect to the data point of Q0 is also proportional to (Qk−Q0).
In some embodiments, upper step S400 may include the following steps.
First, an upper limit voltage and a lower limit voltage are obtained. regarding the upper limit voltage and the lower limit voltage, they can be adapted from the historical correlation data or reset if necessary.
Then, the electric charge corresponding to the upper limit voltage and the electric charge corresponding to the lower limit voltage are obtained from the updated correlation data.
Finally, the absolute value of the electric charge difference between the electric charge assigned to the upper limit voltage and the electric charge assigned to the lower limit voltage is determined as the battery capacity.
In the battery management system of the mobile power supply, an upper and a lower limit voltage are usually preset, each representing the maximum and minimum battery voltage. Therefore, the battery capacity is between the charge corresponding to the highest voltage and the charge corresponding to the lowest voltage. After the charging/discharging characteristic has been corrected, the battery capacity is calculated again.
In some exemplary embodiments, the method for determining the electric charge change of the battery during charging or discharging in the above step S100 can comprise the following steps: detecting an input current or an output current of the battery according to a set frequency; multiplying each of the sensed input currents or output currents by the reciprocal of the frequency and then summing to get the electric charge change of the battery during charging or discharging. The frequency on which the sampling or detection is based can be fixed or, if necessary, adjustable. This frequency is adjusted e.g., according to the variation of the sampled current in the past.
As an exemplary embodiment, see
When the power supply is switched on, the operating voltage of the battery V0 is measured and the electric charge Q0 corresponding to this operating voltage V0 is found from the voltage-charge characteristic.
When charging or discharging, the input or output current of the battery is measured in a very short period of time t, and the electric charge change for a certain period of time (n*ti) can be calculated as d.h. Cn=Σi=1nIiti.
After charging or discharging, the voltage of the battery V1 is measured again.
The voltage V2, which corresponds to the battery charge (Q0+Cn) after charging or discharging, is obtained from the correlation data of the voltage change with the charge stored in the memory. This can be determined by reading out the data stored in the memory. Each record in the correlation data can be represented as (Vx, Qx). Reading out the memory shows that V2 is the corresponding voltage in the correlation data for the electric charge Q0+Cn.
When Q0+Cn is charged, the voltage stored in the memory is corrected as follows:
This formula corrects the voltage according to both the voltage data actually recognized and the historical voltage data stored in the memory.
If the electric charge change of the battery during charging or discharging is large (Cn), the weight of the measured voltage of the battery V1 after charging or discharging is relatively large. If the original electric charge of the battery is large, i.e., the electric charge of the battery before charging or discharging is large, the weight of the voltage of the battery V2 recorded in the historical correlation data is greater after charging or discharging. Thus, the above formula is available for correcting the voltage.
In the memory, the charge Qk corresponds to the voltage Vk. (Vk, Qk) is located in the characteristic curve behind the point (V2, Q0). According to the corrected voltage Vm, a corresponding charge Qm is determined in the data stored in the original memory. Using the Qm the electric charge Qk stored in the memory, which corresponds to the voltage Vk, is corrected as follows:
The corrected electric charge Qk is stored in the memory of the system.
When the change in electric charge is Cn, and the voltage drops to Vm, the change stored in the original memory becomes Qm−Q0. Then the ratio of the actual change in electric charge and the charge stored in the memory is
For any Qk, the difference between the charge corresponding to Qk and charge Q is proportional to the difference between the charge Qk and charge Q0 recorded in the memory and their ratio is
On the basis of the updated voltage/charge data and the set limit voltage, the battery capacity Q is in turn calculated and the capacity stored in the memory is updated.
An upper and a lower limit voltage are usually provided within the battery management system, each representing the maximum and minimum battery voltage. Therefore, the battery capacity is defined as a change from the charge corresponding to the highest voltage to the charge corresponding to the lowest voltage. After the discharge characteristic has been corrected, the battery capacity is calculated again.
As one aspect of the exemplary embodiments of the present application, see
In one embodiment, see
In some exemplary embodiments, the update module 300 further comprises:
In some embodiments, the correction voltage determination unit 340 includes the following formula:
In some exemplary embodiments, the charge update unit 360 is used to ensure that for any electric charge that changes due to charging or discharging, the correlation data is updated based on the estimated electric charge of the battery before charging or discharging according to the following formula:
In some exemplary embodiments, the battery capacity determination module 400 comprises:
In some exemplary embodiments, the determination module 100 comprises:
The functions of the device can be implemented by hardware or by appropriate software executed by hardware. The hardware or software comprises one or more modules corresponding to the functions mentioned above.
As an example of the exemplary embodiments of the present application, an exemplary embodiment of the present application provides the following configuration that the structure for estimating a battery capacity comprises a processor and a memory, the memory being used for the estimating device of the battery capacity to execute the program that corresponds to the above estimation method of the battery capacity, and to execute the correlation data between the voltage and the charge of the battery, the processor being configured to execute the program stored in the memory. The estimation device for the battery capacity also comprises a communication interface via which the estimation device for the battery capacity can communicate with other devices or communication networks.
The device further comprises:
If the memory 21, the processor 22 and the communication interface 23 are implemented independently of one another, the memory 21, the processor 22 and the communication interface 23 can be connected to one another via a bus and thus communication takes place with one another. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (External Device Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, and so on. The buses can be classified as an address bus, data bus, control bus, etc. To simplify the illustration, only a thick line is shown in
Optionally, the memory 21, the processor 22 and the communication interface 23 can be integrated on a single chip in a specific embodiment. The memory 21, the processor 22 and the communication interface 23 can then communicate with one another via an internal interface.
In the description of this invention, the terms “an embodiment”, “some embodiments”, “example”, “specific examples” or “some examples” mean the specific features, structures, materials or properties used in connection with the embodiment or the examples are included in at least one embodiment or an example of the application. In addition, the specific features, structures, materials or properties described can be combined in a suitable manner in one or more exemplary embodiments or examples. In addition, the person skilled in the art can combine the various exemplary embodiments or examples described therein, as well as the features of the various exemplary embodiments or examples, without contradicting one another.
Furthermore, the terms “first” and “second” are used for descriptive purposes only and are not to be construed as explicitly or implying relative relevance or implying the number of technical features specified. A feature delimited by “first” and “second” can expressly or implicitly include at least one such feature. In the description of the present application, “plural” means two or more, unless expressly and specifically restricted otherwise.
Any process or method description described in the flowchart or otherwise described herein can be understood to represent a module, excerpt, or part of code that includes one or more executable instructions for implementing the steps of a particular logical function or process, and the preferred embodiments of the present application encompass additional implementations in which the functions cannot be performed in the order shown or spoken, including in basically the same manner or in reverse order depending on the functions, this to one skilled in the art Field to which the embodiments of the present application pertain should be understood.
For example, the logic and/or steps depicted in the flowchart or otherwise described herein may be viewed as a definitive list of executable instructions for implementing a logical function specifically implemented in any computer readable medium for use by an instruction execution system, apparatus, or device may (e.g., a computer-based system, a system with a processor, or any other system that can accept and execute the instructions from an instruction execution system, device, or device) or in combination with such instruction execution system, device, or device. For purposes of describing the application, a “computer readable medium” can be any device that can contain, store, communicate, distribute, or transmit a program for use by or in connection with an instruction execution system, device, or device.
The computer readable medium of the embodiments of the present application can be a computer readable signal medium or a computer readable storage medium, or any combination of the two. More specific examples of computer readable storage media include at least (non-exhaustive list) the following devices: electrical connector (electronic device) with one or more wirings, portable computer disk cartridge (magnetic device), random access memory (RAM), read only memory (ROM), erasable, editable Read-only memory (EPROM or flash memory), fiber optic device and a portable read-only memory (CDROM). Alternatively, the computer-readable storage medium can also be paper or another suitable medium on which a program can be printed, since the program can be obtained electronically, e.g., by optical scanning of the paper or another medium, followed by processing, decoding or, if necessary, other appropriate processing, and then stored in computer memory.
In the exemplary embodiments of the present application, the computer-readable signal medium can comprise a data signal which is propagated in baseband or as part of a carrier wave and which carries computer-readable program code. Such propagated data signals can take a variety of forms including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the foregoing. The computer-readable signaling medium can also be any computer-readable medium other than a computer-readable storage medium. The computer readable medium sends, propagates, or transmits a program for use by or in connection with an instruction execution system, input method, or apparatus. The program code contained on the computer readable medium can be transmitted over any suitable medium including, but not limited to: wireless, cable, fiber optic cable, radio frequency (RF), or the like, or any suitable combination of the foregoing.
It should be understood that the various parts of the present application can be implemented with hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented with software or firmware stored in memory and executed by a suitable instruction execution system. For an implementation with hardware, as in another implementation, any of the following prior art techniques or their combination can be used: discrete logic circuits with logic gate circuits for implementing logic functions on data signals, dedicated integrated circuits with suitable combinations of logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs) or similar.
A person skilled in the art can understand that all or some of the steps with which the method of the embodiments described above is implemented can be performed by programs for instructing the associated hardware, and that the program can be stored in a computer-readable storage medium when performing the Program will contain one of the steps of the exemplary embodiment of the method or a combination thereof.
In addition, individual functional units in various exemplary embodiments of the present application can be integrated into a processing module, or they can be physically separate, or two or more units can be integrated into a single module. The above-mentioned integrated modules can be implemented either in hardware or in software function modules. The integrated module can also be stored in a computer-readable storage medium if it is implemented as a software functional module and sold or used as a stand-alone product. The storage medium can be a read-only memory, a floppy disk or a CD-ROM, and so on.
The above describes only the specific embodiment of this application, the scope of protection of the application is not limited thereby, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. The scope of protection of this application is therefore based on the scope of protection of the claims.
This application is a continuation of the U.S. application Ser. No. 17/197,220 filed on 10 Mar. 2021, entitled “Method, Apparatus, Storage Medium and Terminal Device for Estimating Battery Capacity,” which claims the benefit and priority of Hong Kong Patent Application No. 32020003991.7, filed on 10 Mar. 2020, the disclosures of which are incorporated herein by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17197220 | Mar 2021 | US |
| Child | 18810807 | US |
