Battery power acquisition method and device

Abstract

The present invention provides a battery power acquisition method and device, the method comprising: acquiring the current ambient temperature of the environment in which the battery pack is located; when controlling the battery pack to discharge: stopping the discharge when the discharge time of the battery pack reaches a first preset time, and acquiring the first voltage of the battery pack after the battery pack reaches a static state; acquiring the first static SOC value of the battery pack according to the first voltage and the current ambient temperature; stopping the discharge when the battery pack discharges for the second time and the discharge time reaches a second preset time, and acquiring the second voltage of the battery pack after the battery pack reaches a static state; acquiring the second static SOC value of the battery pack according to the second voltage and the current ambient temperature; acquiring the total capacity of the battery pack at the current ambient temperature according to the first static SOC value, the second static SOC value and the coulomb integrated charge of the second discharge of the battery pack. The present invention can calibrate the SOC and total capacity of the battery pack, so as to accurately acquire the total capacity, remaining power and other power data of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery power acquisition method and a battery power acquisition device. Background Art

[0002] Accurate display of battery power data is very important for electric vehicles. Due to the influence of battery aging, ambient temperature, etc., current technology often makes it difficult to obtain accurate battery power data. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a battery power acquisition method and device, which can calibrate the SOC (State of Charge) and total capacity of a battery pack, so as to accurately acquire power data such as the total capacity and remaining power of the battery pack.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A battery power acquisition method, comprising: acquiring the current ambient temperature of the environment in which a battery pack is located; when controlling the battery pack to discharge: stopping the discharge when the discharge time of the battery pack reaches a first preset time, and acquiring the first voltage of the battery pack after the battery pack reaches a static state; acquiring the first static SOC value of the battery pack according to the first voltage and the current ambient temperature; stopping the discharge when the battery pack discharges for the second time and the discharge time reaches a second preset time, and acquiring the second voltage of the battery pack after the battery pack reaches a static state; acquiring the second static SOC value of the battery pack according to the second voltage and the current ambient temperature; acquiring the total capacity of the battery pack at the current ambient temperature according to the first static SOC value, the second static SOC value and the coulomb integrated charge of the second discharge of the battery pack, and when charging the battery pack: acquiring the initial charging SOC value of the battery pack; after the battery pack is fully charged, acquiring the total capacity of the battery pack at the current ambient temperature according to the initial charging SOC value of the battery pack and the coulomb integrated charge of the battery pack.

[0006] The battery power acquisition method further includes: acquiring the total capacity of the battery pack at the standard ambient temperature according to the current ambient temperature, the standard ambient temperature and the total capacity of the battery pack at the current ambient temperature.

[0007] The battery power acquisition method further includes: acquiring a real-time SOC value of the battery pack; and acquiring a real-time remaining power of the battery pack according to the total capacity of the battery pack at a standard ambient temperature and the real-time SOC value of the battery pack.

[0008] The battery power acquisition method also includes: acquiring the discharge current or charging current of the battery pack, wherein the coulomb integrated power of the second discharge of the battery pack is acquired according to the discharge current of the battery pack; the coulomb integrated power of the charging of the battery pack is acquired according to the charging current of the battery pack; whether the battery pack has reached a static state is judged according to the discharge current of the battery pack; and whether the battery pack is fully charged is judged according to the charging current of the battery pack.

[0009] The first stationary SOC value and the second stationary SOC value are obtained according to the following relationship:

[0010] Y=(At*X+Bt)*N

[0011] Wherein, Y is the first voltage or the second voltage, X is the first static SOC value or the second static SOC value, N is the number of cells in the battery pack, and At and Bt are temperature coefficients.

[0012] During discharge, the total capacity of the battery pack at the current ambient temperature is obtained according to the following relationship:

[0013] Qt=△Q / (SOC1-SOC2)

[0014] When charging, the total capacity of the battery pack at the current ambient temperature is obtained according to the following relationship:

[0015] Qt=△Q / (1-SOCio)

[0016] Among them, Qt is the total capacity of the battery pack at the current ambient temperature, △Q is the coulomb integrated charge, SOC1 is the first static SOC value, SOC2 is the second static SOC value, and SOCio is the initial charging SOC value.

[0017] The total capacity of the battery pack at standard ambient temperature is obtained according to the following relationship:

[0018] Q0=Qt-k*(Ti-T0)

[0019] Wherein, Q0 is the total capacity of the battery pack at the standard ambient temperature, Ti is the current ambient temperature, T0 is the standard ambient temperature, and k is the conversion coefficient.

[0020] A battery power acquisition device comprises a first acquisition module, a second acquisition module, a third acquisition module, a fourth acquisition module, a fifth acquisition module and a sixth acquisition module, wherein the first acquisition module is used to acquire the current ambient temperature of the environment in which the battery pack is located; when controlling the discharge of the battery pack: the second acquisition module is used to stop the discharge when the discharge time of the battery pack reaches a first preset time, and acquire the first voltage of the battery pack after the battery pack reaches a static state, stop the discharge when the battery pack discharges for the second time and the discharge time reaches a second preset time, and acquire the second voltage of the battery pack after the battery pack reaches a static state; the third acquisition module is used to obtain the current ambient temperature of the environment in which the battery pack is located according to the first voltage and the current ambient temperature; when controlling the discharge of the battery pack: the second acquisition module is used to stop the discharge when the discharge time of the battery pack reaches a first preset time, and acquire the first ... The first stationary SOC value of the battery pack is obtained according to the ambient temperature, and the second stationary SOC value of the battery pack is obtained according to the second voltage and the current ambient temperature; the fourth acquisition module is used to obtain the total capacity of the battery pack at the current ambient temperature according to the first stationary SOC value, the second stationary SOC value and the coulomb integrated charge of the battery pack for the second discharge. When the battery pack is charged: the fifth acquisition module is used to obtain the initial charging SOC value of the battery pack; the sixth acquisition module is used to obtain the total capacity of the battery pack at the current ambient temperature according to the initial charging SOC value of the battery pack and the coulomb integrated charge of the battery pack after the battery pack is fully charged.

[0021] The battery power acquisition device further includes: a seventh acquisition module, which is used to acquire the total capacity of the battery pack at the standard ambient temperature according to the current ambient temperature, the standard ambient temperature and the total capacity of the battery pack at the current ambient temperature.

[0022] The battery power acquisition device also includes: an eighth acquisition module, which is used to obtain the real-time SOC value of the battery pack; and a ninth acquisition module, which is used to obtain the real-time remaining power of the battery pack based on the total capacity of the battery pack at the standard ambient temperature and the real-time SOC value of the battery pack.

[0023] Beneficial effects of the present invention:

[0024] The battery power acquisition method and device of the present invention acquire the SOC values ​​of two static calibrations of the battery pack when the battery pack is discharging, and acquire the total capacity of the battery pack at the current ambient temperature in combination with the discharge integral power; acquire the initial charging SOC value of the battery pack when the battery pack is charging, and acquire the total capacity of the battery pack at the current ambient temperature in combination with the charging integral power, thereby being able to calibrate the SOC and total capacity of the battery pack, thereby being able to accurately acquire power data such as the total capacity and remaining power of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A flowchart of a method for obtaining battery power according to an embodiment of the present invention;

[0026] Figure 2 FIG. 4 is a block diagram of a device for acquiring battery power according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, the battery power acquisition method of the embodiment of the present invention includes the following steps:

[0029] S1, obtaining the current ambient temperature of the environment where the battery pack is located.

[0030] In one embodiment of the present invention, the battery pack is a power battery pack used in an electric vehicle, for example, a lead-acid power battery pack of an electric vehicle. The current ambient temperature of the environment where the battery pack is located can be collected by a temperature sensor arranged on the electric vehicle.

[0031] In one embodiment of the present invention, the discharge current or the charge current of the battery pack may be collected by a current sensor disposed in the battery pack.

[0032] When the battery pack is controlled to discharge, steps S2 to S6 are executed; when the battery pack is charged, steps S7 to S8 are executed.

[0033] S2, stopping the discharge of the battery pack when the discharge time of the battery pack reaches a first preset time, and obtaining a first voltage of the battery pack after the battery pack reaches a static state.

[0034] S3, obtaining a first static SOC value of the battery pack according to the first voltage and the current ambient temperature.

[0035] S4, when the battery pack is discharged for the second time and the discharge time reaches a second preset time, the discharge is stopped, and a second voltage of the battery pack is obtained after the battery pack reaches a static state.

[0036] S5, obtaining a second static SOC value of the battery pack according to the second voltage and the current ambient temperature.

[0037] In one embodiment of the present invention, the first preset time and the second preset time can be set according to the discharge rate of the battery pack, so that there is a relatively obvious discharge amount within the first preset time and the second preset time.

[0038] In one embodiment of the present invention, it is possible to determine whether the battery pack has reached a stationary state based on the discharge current of the battery pack. When the battery pack stops discharging, the discharge current is close to the standby current after the electric vehicle is shut down, and continues at this current for a period of time, it can be determined that the battery pack has reached a stationary state. At this time, the open circuit voltage of the battery pack also tends to be stable and no longer changes significantly.

[0039] In one embodiment of the present invention, the first static SOC value and the second static SOC value may be obtained according to the following relationship:

[0040] Y=(At*X+Bt)*N

[0041] Wherein, Y is the first voltage or the second voltage, X is the first static SOC value or the second static SOC value, N is the number of cells in the battery pack, and At and Bt are temperature coefficients.

[0042] The temperature coefficients At and Bt can be determined based on a curve of the relationship between the open circuit voltage and the temperature. In a specific embodiment of the present invention, when the current ambient temperature is greater than or equal to 10°C, At and Bt can be 1.77 and 11.5, respectively; when the current ambient temperature is greater than or equal to -5°C and less than 10°C, At and Bt can be 1.523 and 11.6, respectively; when the current ambient temperature is less than -5°C, At and Bt can be 1.255 and 11.7, respectively.

[0043] S6, obtaining the total capacity of the battery pack at the current ambient temperature according to the first static SOC value, the second static SOC value, and the coulomb integrated charge of the battery pack during the second discharge.

[0044] In one embodiment of the present invention, the coulomb integrated charge of the battery pack for the second discharge can be obtained based on the discharge current of the battery pack. Specifically, the charge can be obtained by integrating the discharge current with the discharge time. The integral of the current of the second discharge of the battery pack over the second preset time is the coulomb integrated charge of the battery pack for the second discharge.

[0045] In one embodiment of the present invention, the total capacity of the battery pack at the current ambient temperature can be obtained according to the following relationship during discharge:

[0046] Qt=△Q / (SOC1-SOC2)

[0047] Among them, Qt is the total capacity of the battery pack at the current ambient temperature, △Q is the coulomb integrated charge, SOC1 is the first static SOC value, and SOC2 is the second static SOC value.

[0048] S7, obtaining the initial charging SOC value of the battery pack.

[0049] When the battery pack is used for the first time after leaving the factory, the initial SOC value of charging can be obtained by looking up the open circuit voltage and SOC correspondence table based on the open circuit voltage of the battery pack. During the daily use of the battery pack, the real-time SOC value stored when the electric vehicle was last shut down can be used as the initial SOC value of the battery pack for charging this time.

[0050] S8, after the battery pack is fully charged, the total capacity of the battery pack at the current ambient temperature is obtained according to the initial SOC value of the battery pack and the coulomb integrated charge of the battery pack.

[0051] In one embodiment of the present invention, whether the battery pack is fully charged can be determined based on the charging current of the battery pack. Specifically, when the charging current is less than a preset current threshold, such as 0.5A, and lasts for a preset time threshold, such as 5 minutes, the battery pack can be determined to be fully charged. At this point, the timing starts, and after a period of time, such as 1 hour, the total capacity of the battery pack at the current ambient temperature can be obtained.

[0052] In one embodiment of the present invention, the coulomb integrated charge of the battery pack can be obtained according to the charging current of the battery pack. Specifically, the coulomb integrated charge of the battery pack can be obtained by integrating the charging current with the charging time.

[0053] In one embodiment of the present invention, the total capacity of the battery pack at the current ambient temperature can be obtained during charging according to the following relationship:

[0054] Qt=△Q / (1-SOCio)

[0055] Among them, SOCio is the initial SOC value of charging.

[0056] Furthermore, the total capacity of the battery pack at the standard ambient temperature may be acquired according to the current ambient temperature, the standard ambient temperature, and the total capacity of the battery pack at the current ambient temperature.

[0057] In one embodiment of the present invention, the total capacity of the battery pack at the standard ambient temperature can be obtained according to the following relationship:

[0058] Q0=Qt-k*(Ti-T0)

[0059] Among them, Q0 is the total capacity of the battery pack at the standard ambient temperature, Ti is the current ambient temperature, T0 is the standard ambient temperature, and k is the conversion coefficient.

[0060] In a specific embodiment of the present invention, the standard ambient temperature may be 25° C., and the corresponding conversion coefficient k is 0.15.

[0061] After obtaining the total capacity of the battery pack at the standard ambient temperature, the value can be used as a reference to obtain the real-time remaining capacity of the battery pack. Specifically, the real-time SOC value of the battery pack can be obtained, and the real-time remaining capacity of the battery pack can be obtained based on the total capacity of the battery pack at the standard ambient temperature and the real-time SOC value of the battery pack.

[0062] The real-time SOC value of the battery pack can be obtained by the ampere-hour integration method. At the same time, the SOC value can be calibrated occasionally or frequently using the above steps S3 and S5. The total capacity of the battery pack at the standard ambient temperature can also be calibrated occasionally or frequently using the above steps S1 to S8. After obtaining the real-time SOC value of the battery pack, firstly, according to the total capacity of the battery pack at the standard ambient temperature stored after the last calibration, and the current ambient temperature obtained in real time, the total capacity of the battery pack at the current ambient temperature is calculated using the formula Q0=Qt-k*(Ti-T0), and then the real-time remaining power of the battery pack is calculated based on the real-time SOC value of the battery pack and the total capacity of the battery pack at the current ambient temperature.

[0063] According to the battery power acquisition method of an embodiment of the present invention, when the battery pack is discharging, the SOC values ​​of two static calibrations of the battery pack are obtained, and the total capacity of the battery pack at the current ambient temperature is obtained in combination with the discharge integral power. When the battery pack is charging, the initial charging SOC value of the battery pack is obtained, and the total capacity of the battery pack at the current ambient temperature is obtained in combination with the charging integral power. Thus, the SOC and total capacity of the battery pack can be calibrated, so that the total capacity, remaining power and other power data of the battery pack can be accurately obtained.

[0064] Corresponding to the battery power acquisition method of the above embodiment, the present invention further provides a battery power acquisition device.

[0065] like Figure 2As shown, the battery power acquisition device of the embodiment of the present invention includes a first acquisition module 10, a second acquisition module 20, a third acquisition module 30, a fourth acquisition module 40, a fifth acquisition module 50 and a sixth acquisition module 60. Among them, the first acquisition module 10 is used to acquire the current ambient temperature of the environment in which the battery pack is located. When controlling the discharge of the battery pack: the second acquisition module 20 is used to stop the discharge when the discharge time of the battery pack reaches the first preset time, and acquire the first voltage of the battery pack after the battery pack reaches the static state, stop the discharge when the battery pack discharges for the second time and the discharge time reaches the second preset time, and acquire the second voltage of the battery pack after the battery pack reaches the static state; the third acquisition module 30 is used to acquire the first static SOC value of the battery pack according to the first voltage and the current ambient temperature, and acquire the second static SOC value of the battery pack according to the second voltage and the current ambient temperature; the fourth acquisition module 40 is used to acquire the total capacity of the battery pack at the current ambient temperature according to the first static SOC value, the second static SOC value and the coulomb integrated charge of the second discharge of the battery pack. When charging the battery pack: the fifth acquisition module 50 is used to obtain the initial charging SOC value of the battery pack; the sixth acquisition module 60 is used to obtain the total capacity of the battery pack at the current ambient temperature according to the initial charging SOC value of the battery pack and the coulomb integrated charge of the battery pack after the battery pack is fully charged.

[0066] In one embodiment of the present invention, the battery pack is a power battery pack used in an electric vehicle. The first acquisition module 10 can collect the current ambient temperature of the environment where the battery pack is located through a temperature sensor disposed on the electric vehicle.

[0067] In one embodiment of the present invention, the discharge current or the charge current of the battery pack may be collected by a current sensor disposed in the battery pack.

[0068] When the battery pack is controlled to discharge, the second to sixth acquisition modules perform corresponding functions; when the battery pack is charged, the seventh and eighth acquisition modules perform corresponding functions.

[0069] In one embodiment of the present invention, the first preset time and the second preset time can be set according to the discharge rate of the battery pack, so that there is a relatively obvious discharge amount within the first preset time and the second preset time.

[0070] In one embodiment of the present invention, the second acquisition module 20 can determine whether the battery pack has reached a static state based on the discharge current of the battery pack. When the battery pack stops discharging, the discharge current is close to the standby current after the electric vehicle is shut down, and continues at this current for a period of time, it can be determined that the battery pack has reached a static state. At this time, the open circuit voltage of the battery pack also tends to be stable and no longer changes significantly.

[0071] In one embodiment of the present invention, the third acquisition module 30 may acquire the first static SOC value and the second static SOC value according to the following relationship:

[0072] Y=(At*X+Bt)*N

[0073] Wherein, Y is the first voltage or the second voltage, X is the first static SOC value or the second static SOC value, N is the number of cells in the battery pack, and At and Bt are temperature coefficients.

[0074] The temperature coefficients At and Bt can be determined based on a curve of the relationship between the open circuit voltage and the temperature. In a specific embodiment of the present invention, when the current ambient temperature is greater than or equal to 10°C, At and Bt can be 1.77 and 11.5, respectively; when the current ambient temperature is greater than or equal to -5°C and less than 10°C, At and Bt can be 1.523 and 11.6, respectively; when the current ambient temperature is less than -5°C, At and Bt can be 1.255 and 11.7, respectively.

[0075] In one embodiment of the present invention, the fourth acquisition module 40 can obtain the coulomb integrated charge of the battery pack during the second discharge based on the discharge current of the battery pack. Specifically, the charge can be obtained by integrating the discharge current with the discharge time. The integral of the current of the second discharge of the battery pack over the second preset time is the coulomb integrated charge of the battery pack during the second discharge.

[0076] In one embodiment of the present invention, the fourth acquisition module 40 may acquire the total capacity of the battery pack at the current ambient temperature according to the following relationship:

[0077] Qt=△Q / (SOC1-SOC2)

[0078] Among them, Qt is the total capacity of the battery pack at the current ambient temperature, △Q is the coulomb integrated charge, SOC1 is the first static SOC value, and SOC2 is the second static SOC value.

[0079] When the battery pack is used for the first time after leaving the factory, the fifth acquisition module 50 can obtain the initial SOC value of charging by looking up the corresponding relationship table between the open circuit voltage and SOC according to the open circuit voltage of the battery pack. During the daily use of the battery pack, the fifth acquisition module 50 can use the real-time SOC value stored at the time when the electric vehicle was last shut down as the initial SOC value of charging of the battery pack.

[0080] In one embodiment of the present invention, the sixth acquisition module 60 can determine whether the battery pack is fully charged based on the charging current of the battery pack. Specifically, when the charging current is less than a preset current threshold, such as 0.5A, and lasts for a preset time threshold, such as 5 minutes, it can be determined that the battery pack is fully charged. At this time, the timing starts, and after a period of time, such as 1 hour, the total capacity of the battery pack at the current ambient temperature can be obtained.

[0081] In one embodiment of the present invention, the sixth acquisition module 60 can acquire the coulomb integrated charge of the battery pack according to the charging current of the battery pack. Specifically, the coulomb integrated charge of the battery pack can be obtained by integrating the charging current with the charging time.

[0082] In one embodiment of the present invention, the sixth acquisition module 60 may acquire the total capacity of the battery pack at the current ambient temperature according to the following relationship:

[0083] Qt=△Q / (1-SOCio)

[0084] Among them, SOCio is the initial SOC value of charging.

[0085] Furthermore, the battery power acquisition device of the embodiment of the present invention may also include: a seventh acquisition module, which is used to acquire the total capacity of the battery pack at the standard ambient temperature according to the current ambient temperature, the standard ambient temperature and the total capacity of the battery pack at the current ambient temperature.

[0086] In one embodiment of the present invention, the seventh acquisition module may acquire the total capacity of the battery pack at the standard ambient temperature according to the following relationship:

[0087] Q0=Qt-k*(Ti-T0)

[0088] Among them, Q0 is the total capacity of the battery pack at the standard ambient temperature, Ti is the current ambient temperature, T0 is the standard ambient temperature, and k is the conversion coefficient.

[0089] In a specific embodiment of the present invention, the standard ambient temperature may be 25° C., and the corresponding conversion coefficient k is 0.15.

[0090] After obtaining the total capacity of the battery pack at the standard ambient temperature, the value can be used as a reference to obtain the real-time remaining power of the battery pack. Specifically, the battery power acquisition device of the embodiment of the present invention may also include an eighth acquisition module and a ninth acquisition module, the eighth acquisition module can obtain the real-time SOC value of the battery pack, and the ninth acquisition module can obtain the real-time remaining power of the battery pack according to the total capacity of the battery pack at the standard ambient temperature and the real-time SOC value of the battery pack.

[0091] The real-time SOC value of the battery pack can be obtained by the ampere-hour integration method. At the same time, the SOC value can be calibrated occasionally or frequently by the third acquisition module 30. The total capacity of the battery pack at the standard ambient temperature can also be calibrated occasionally or frequently by the first to fifth acquisition modules. After obtaining the real-time SOC value of the battery pack, the ninth acquisition module can first calculate the total capacity of the battery pack at the current ambient temperature using the formula Q0=Qt-k*(Ti-T0) based on the total capacity of the battery pack at the standard ambient temperature stored after the last calibration and the current ambient temperature obtained in real time, and then calculate the real-time remaining power of the battery pack based on the real-time SOC value of the battery pack and the total capacity of the battery pack at the current ambient temperature.

[0092] According to the battery power acquisition device of the embodiment of the present invention, when the battery pack is discharging, the SOC values ​​of two static calibrations of the battery pack are acquired, and the total capacity of the battery pack at the current ambient temperature is acquired in combination with the discharge integral power. When the battery pack is charging, the initial charging SOC value of the battery pack is acquired, and the total capacity of the battery pack at the current ambient temperature is acquired in combination with the charging integral power. Thus, the SOC and total capacity of the battery pack can be calibrated, so that power data such as the total capacity and remaining power of the battery pack can be accurately acquired.

[0093] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0094] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0097] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0098] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in combination with these instruction execution systems, apparatuses or devices.

[0099] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0100] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0101] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for obtaining battery power, It is characterized in that include: Get the current ambient temperature of the battery pack's environment; When controlling the battery pack to discharge: When the discharging time of the battery pack reaches a first preset time, the discharging is stopped, and after the battery pack reaches a static state, a first voltage of the battery pack is acquired; Acquire a first static SOC value of the battery pack according to the first voltage and the current ambient temperature; When the battery pack is discharged for the second time and the discharge time reaches a second preset time, the discharge is stopped, and a second voltage of the battery pack is obtained after the battery pack reaches a static state; Acquire a second static SOC value of the battery pack according to the second voltage and the current ambient temperature; The total capacity of the battery pack at the current ambient temperature is obtained according to the first static SOC value, the second static SOC value and the coulomb integrated charge of the second discharge of the battery pack, When charging the battery pack: Obtaining an initial charging SOC value of the battery pack; After the battery pack is fully charged, the total capacity of the battery pack at the current ambient temperature is obtained according to the initial SOC value of the battery pack and the coulomb integrated charge of the battery pack. The battery power acquisition method further includes: acquiring the total capacity of the battery pack at the standard ambient temperature according to the current ambient temperature, the standard ambient temperature and the total capacity of the battery pack at the current ambient temperature, and acquiring the total capacity of the battery pack at the standard ambient temperature according to the following relationship: ； Wherein, Q0 is the total capacity of the battery pack at the standard ambient temperature, Qt is the total capacity of the battery pack at the current ambient temperature, Ti is the current ambient temperature, T0 is the standard ambient temperature, k is the conversion coefficient, The battery power acquisition method also includes: acquiring the real-time SOC value of the battery pack. After acquiring the real-time SOC value of the battery pack, firstly, according to the total capacity of the battery pack at the standard ambient temperature stored after the last calibration and the current ambient temperature acquired in real time, the total capacity of the battery pack at the current ambient temperature is calculated using the formula Q0=Qt-k*(Ti-T0), and then the real-time remaining power of the battery pack is calculated according to the real-time SOC value of the battery pack and the total capacity of the battery pack at the current ambient temperature.

2. The method for obtaining battery power according to claim 1, It is characterized in that Also includes: Obtaining the discharge current or charge current of the battery pack, wherein: Obtaining the coulomb integrated charge of the second discharge of the battery pack according to the discharge current of the battery pack; Obtaining the coulomb integrated charge of the battery pack according to the charging current of the battery pack; determining whether the battery pack has reached a stationary state according to a discharge current of the battery pack; Whether the battery pack is fully charged is determined according to the charging current of the battery pack.

3. The method for obtaining battery power according to claim 2, It is characterized in that The first stationary SOC value and the second stationary SOC value are obtained according to the following relationship: ； Wherein, Y is the first voltage or the second voltage, X is the first static SOC value or the second static SOC value, N is the number of cells in the battery pack, and At and Bt are temperature coefficients.

4. The method for obtaining battery power according to claim 3, It is characterized in that During discharge, the total capacity of the battery pack at the current ambient temperature is obtained according to the following relationship: ； When charging, the total capacity of the battery pack at the current ambient temperature is obtained according to the following relationship: ； Among them, Qt is the total capacity of the battery pack at the current ambient temperature, △Q is the coulomb integrated charge, SOC1 is the first static SOC value, SOC2 is the second static SOC value, and SOCio is the initial charging SOC value.

5. A battery power acquisition device, It is characterized in that comprising a first acquisition module, a second acquisition module, a third acquisition module, a fourth acquisition module, a fifth acquisition module and a sixth acquisition module, The first acquisition module is used to acquire the current ambient temperature of the environment in which the battery pack is located; When controlling the battery pack to discharge: The second acquisition module is used to stop discharging when the discharge time of the battery pack reaches a first preset time, and acquire the first voltage of the battery pack after the battery pack reaches a static state, stop discharging when the battery pack discharges for the second time and the discharge time reaches a second preset time, and acquire the second voltage of the battery pack after the battery pack reaches a static state; The third acquisition module is used to acquire a first static SOC value of the battery pack according to the first voltage and the current ambient temperature, and to acquire a second static SOC value of the battery pack according to the second voltage and the current ambient temperature; The fourth acquisition module is used to acquire the total capacity of the battery pack at the current ambient temperature according to the first static SOC value, the second static SOC value and the coulomb integrated charge of the second discharge of the battery pack, When charging the battery pack: The fifth acquisition module is used to acquire the initial charging SOC value of the battery pack; The sixth acquisition module is used to acquire the total capacity of the battery pack at the current ambient temperature according to the initial SOC value of the battery pack and the coulomb integrated charge of the battery pack after the battery pack is fully charged. The battery power acquisition device further includes: a seventh acquisition module, the seventh acquisition module is used to acquire the total capacity of the battery pack at the standard ambient temperature according to the current ambient temperature, the standard ambient temperature and the total capacity of the battery pack at the current ambient temperature, and the seventh acquisition module acquires the total capacity of the battery pack at the standard ambient temperature according to the following relationship: ； Wherein, Q0 is the total capacity of the battery pack at the standard ambient temperature, Qt is the total capacity of the battery pack at the current ambient temperature, Ti is the current ambient temperature, T0 is the standard ambient temperature, k is the conversion coefficient, The battery power acquisition device also includes: an eighth acquisition module, the eighth acquisition module is used to acquire the real-time SOC value of the battery pack; a ninth acquisition module, after acquiring the real-time SOC value of the battery pack, the ninth acquisition module first calculates the total capacity of the battery pack at the current ambient temperature based on the total capacity of the battery pack at the standard ambient temperature stored after the last calibration and the current ambient temperature acquired in real time, using the formula Q0=Qt-k*(Ti-T0), and then calculates the real-time remaining power of the battery pack based on the real-time SOC value of the battery pack and the total capacity of the battery pack at the current ambient temperature.

Images