CN109782177B - Method and device for acquiring electric quantity of battery and automobile - Google Patents
Method and device for acquiring electric quantity of battery and automobile Download PDFInfo
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Abstract
The invention provides a method and a device for acquiring battery electric quantity and an automobile, wherein the method for acquiring the battery electric quantity comprises the following steps: acquiring a battery parameter every other first preset time, and calculating according to the battery parameter to obtain the charge state of the battery; and calculating to obtain the maximum available power consumption every second preset time according to the charge state obtained by calculation, wherein the second preset time is longer than the first preset time. In the invention, different time scales are adopted when the charge state and the maximum available electric quantity are calculated; the first preset time is used as a microscopic time scale when the state of charge is calculated, and the second preset time is used as a macroscopic time scale when the maximum available electric quantity is calculated, so that the influence of a single time scale on the calculation time is avoided.
Description
Technical Field
The invention relates to the field of battery systems, in particular to a method and a device for acquiring battery electric quantity and an automobile.
Background
The parameters reflecting the condition of the lithium battery system include a State of Charge (SOC), a State of Health (SOH), and a State of Life (SOL). With the aging of the lithium battery, the maximum available electric quantity and the internal resistance of the battery also change, which directly causes the capacity attenuation and the power attenuation of the battery, and the performance of the battery is reduced. The research work for estimating the degradation characteristic parameters of the lithium battery at home and abroad can be divided into a model-based prediction method and a hybrid prediction method.
In the model-based prediction method, classification is made according to a modeling method, including a mathematical model, an electrochemical model, and an electric equivalent circuit model. The electrochemical model describes the electrochemical action inside the cell through a set of coupled partial differential equations. The Thevenin battery model mainly considers the characteristics of sudden change and gradual change of the voltage of the lithium battery under the excitation of charge and discharge current. Mathematical models that characterize cell dynamics include open circuit voltage, ohmic losses, polarization time constants, and take into account the effects of electrochemical hysteresis and temperature.
In the hybrid prediction method, according to the application of the method based on the extended Kalman filtering in the lithium battery power management system, a Kalman filtering algorithm flow for estimating the SOC of the lithium battery is designed, and a Kalman filtering joint estimation algorithm is provided at the same time.
However, when the SOC and the maximum available power are estimated by using the kalman filter joint estimation algorithm, the estimation of the SOC and the estimation of the maximum available power are performed on the same time scale, which results in large calculation amount, complex calculation process and influence on calculation time;
disclosure of Invention
The invention provides a method and a device for acquiring battery electric quantity and an automobile, which are used for solving the problem that the calculation time is influenced by estimating the SOC and the maximum available electric quantity on the same time scale in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to an aspect of the present invention, there is provided a method for acquiring battery power, including:
acquiring a battery parameter every other first preset time, and calculating according to the battery parameter to obtain the charge state of the battery;
and calculating to obtain the maximum available power consumption every second preset time according to the charge state obtained by calculation, wherein the second preset time is longer than the first preset time.
Further, the step of obtaining the battery parameters once every a first preset time and calculating the state of charge according to the battery parameters includes:
acquiring terminal voltage, polarization voltage, load current and internal resistance of the battery of one time every a first preset time;
calculating the state of charge of the battery and the charging time corresponding to the state of charge according to the first equation group, the currently acquired terminal voltage, polarization voltage, load current and internal resistance of the battery, wherein the charging time is the time when the state of charge is acquired;
a first set of equations:
wherein U represents terminal voltage, UpRepresenting the polarization voltage, RtThe method comprises the following steps of representing internal resistance of a battery, representing load current, f (z) representing a functional relation between a state of charge and open-circuit voltage, A representing a quadratic term coefficient of the functional relation between the state of charge and the open-circuit voltage, B representing a primary term coefficient of the functional relation between the state of charge and the open-circuit voltage, C representing a constant term of the functional relation between the state of charge and the open-circuit voltage, and SOC representing the state of charge.
Further, the step of obtaining the polarization voltage comprises:
obtaining the polarization resistance, the polarization capacitance and the load current of the battery;
calculating to obtain a polarized voltage according to a first equation, the polarized resistor, the polarized capacitor and the load current;
the first process: 1/UP＝-UP/(Rp×Cp)+I/Cp；
Wherein U ispRepresenting the polarization voltage, I representing the load current, RpDenotes the polarization resistance, CpRepresenting the polarization capacitance.
Further, the step of calculating the maximum available power amount according to the state of charge every second preset time period includes:
obtaining a charge state sequence according to the charge time corresponding to each charge state, wherein the time length between the charge times corresponding to two adjacent charge states in the charge state sequence is a second preset time length;
calculating to obtain the maximum available power consumption corresponding to each charge state in the charge state sequence according to a second equation;
the second equation: SOC ═ 1- ([ j ] i × η × dt)/Q;
wherein SOC represents the state of charge, i represents the load current, Q represents the maximum available electric quantity, eta represents the coulombic efficiency factor, and t represents the battery working time.
According to still another aspect of the present invention, there is provided a battery power acquisition apparatus, including:
the system comprises a charge state calculation module, a charge state calculation module and a charge state calculation module, wherein the charge state calculation module is used for acquiring a battery parameter every first preset time length and calculating the charge state of a battery according to the battery parameter;
and the maximum available electric quantity calculating module is used for calculating the maximum available electric quantity every second preset time according to the charge state obtained by calculation, wherein the second preset time is longer than the first preset time.
Further, the state of charge calculation module comprises:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the terminal voltage, the polarization voltage, the load current and the internal resistance of the battery of one time every a first preset time;
the first calculation unit is used for calculating the charge state of the battery and the charge time corresponding to the charge state according to a first program group, the currently acquired terminal voltage, polarization voltage, load current and battery internal resistance, wherein the charge time is the time for acquiring the charge state;
a first set of equations:
wherein U represents terminal voltage, UpRepresenting the polarization voltage, RtExpressing the internal resistance of the battery, I expressing the load current, f (z) expressing the functional relation between the state of charge and the open-circuit voltage, A expressing the quadratic coefficient of the functional relation between the state of charge and the open-circuit voltage, B expressing the chargeThe coefficient of the first order term of the functional relationship between the state and the open-circuit voltage, C represents the constant term of the functional relationship between the state of charge and the open-circuit voltage, and SOC represents the state of charge.
Further, the maximum available power calculation module includes:
the second calculating unit is used for obtaining a charge state sequence according to the charge time corresponding to each charge state, wherein the time length between the charge times corresponding to two adjacent charge states in the charge state sequence is a second preset time length;
the third calculation unit is used for calculating and obtaining the maximum available electric quantity corresponding to each charge state in the charge state sequence according to a second equation;
the second equation: SOC ═ 1- ([ j ] i × η × dt)/Q;
wherein SOC represents the state of charge, i represents the load current, Q represents the maximum available electric quantity, eta represents the coulombic efficiency factor, and t represents the battery working time.
According to still another aspect of the present invention, there is provided an automobile including the battery charge amount acquisition device as described above.
In accordance with still another aspect of the present invention, there is provided a battery system including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the battery power acquisition method as described above.
According to yet another aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the battery power acquisition method as described above.
The invention has the beneficial effects that:
according to the technical scheme, different time scales are adopted when the charge state and the maximum available electric quantity are calculated; the first preset time is used as a microscopic time scale when the state of charge is calculated, and the second preset time is used as a macroscopic time scale when the maximum available power is calculated, so that the influence of a single time scale on the calculation time is avoided.
Drawings
Fig. 1 is a schematic diagram illustrating a method for acquiring battery power according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a calculated state of charge provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a calculated polarization voltage provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a Thevenin equivalent circuit model provided by an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating calculation of maximum available power according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an apparatus for acquiring battery power according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a state of charge calculation module according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a maximum available power calculating module according to an embodiment of the present invention.
Description of reference numerals:
61. a state of charge calculation module; 611. an acquisition unit; 612. a first calculation unit; 62. a maximum available power calculation module; 621. a second calculation unit; 622. and a third calculation unit.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a method for acquiring battery power, where the method includes:
s11: acquiring a battery parameter every other first preset time, and calculating according to the battery parameter to obtain the charge state of the battery;
it should be noted that the battery parameters are used to calculate the state of charge of the battery, and preferably, the battery parameters include: terminal voltage, polarization voltage, load current, and battery internal resistance, etc., but are not limited thereto. The state of charge of one battery is obtained and calculated every other first preset time; therefore, in a period of time, for each acquired battery parameter, a state of charge corresponding to the acquired battery parameter can be obtained. Thereby yielding multiple states of charge. For example, acquiring a primary battery parameter at a time t1, and calculating to obtain a state of charge of a battery corresponding to the time t 1; and acquiring the parameters of the battery once again at the time t2, calculating to obtain the state of charge of the battery corresponding to the time t2, and so on to obtain the states of charge corresponding to a plurality of times respectively, wherein the time length between two adjacent times is equal to a first preset time length.
Since the state of charge of the battery changes rapidly with time during the running of the vehicle, the first preset time period is usually small and may be set empirically, but is not limited thereto.
S12: and calculating the maximum available electric quantity according to the calculated charge state every second preset time, wherein the second preset time is longer than the first preset time.
It should be noted that the maximum available amount of electricity for a battery can be obtained according to the state of charge of a battery. However, the maximum available charge of the battery changes slowly with time, which is opposite to the change of the state of charge with time; therefore, the time scale is planned again according to the obtained multiple charge states, the maximum available electric quantity is obtained by calculation every second preset time, and the corresponding maximum available electric quantity is not required to be obtained by calculation aiming at each charge state. The second preset time period is usually larger, and can be set by self according to experience, but is not limited to this.
In the embodiment of the invention, different time scales are adopted when the charge state and the maximum available electric quantity are calculated; the first preset time is used as a micro time scale when the charge state is calculated, and the second preset time is used as a macro time scale when the maximum available power consumption is calculated, so that the influence of a single time scale on the calculation time is avoided.
As shown in fig. 2, on the basis of the above embodiment of the present invention, in the embodiment of the present invention, the step of obtaining the battery parameter every first preset time and calculating the state of charge according to the battery parameter includes:
s21: acquiring terminal voltage, polarization voltage, load current and internal resistance of the battery of one time every a first preset time;
it should be noted that the terminal voltage, the polarization voltage, the load current and the internal resistance of the battery are periodically acquired by taking the first preset time period as a cycle. The terminal voltage and the load current of the battery can be obtained by measurement, the polarization voltage of the battery can be obtained by calculation, and the internal resistance of the battery can be obtained by table look-up, but the invention is not limited thereto. The internal resistance of the battery is fixed when the battery leaves a factory, and is a fixed parameter of the battery.
S22: calculating the state of charge of the battery and the charge time corresponding to the state of charge according to the first equation group, the currently acquired terminal voltage, polarization voltage, load current and battery internal resistance, wherein the charge time is the time for acquiring the state of charge;
a first set of equations:
wherein U represents terminal voltage, UpRepresenting the polarization voltage, RtThe method comprises the following steps of representing internal resistance of a battery, representing load current, f (z) representing a functional relation between a state of charge and open-circuit voltage, A representing a quadratic term coefficient of the functional relation between the state of charge and the open-circuit voltage, B representing a primary term coefficient of the functional relation between the state of charge and the open-circuit voltage, C representing a constant term of the functional relation between the state of charge and the open-circuit voltage, and SOC representing the state of charge.
It should be noted that the state of charge of each cycle can be obtained from the terminal voltage, the polarization voltage, the load current, and the battery internal resistance obtained for that cycle. The charge time may be a time at which a state of charge is obtained, or may be a time at which a terminal voltage, a polarization voltage, a load current, and a battery internal resistance are obtained to obtain the state of charge. Here, each cycle is calculated to obtain a state of charge and a time of charge corresponding to the state of charge, so as to represent the state of charge of the battery at the time of charge.
The specific values of A, B and C in the state of charge as a function of open circuit voltage can be determined by a suitable method. For example, charge and discharge experiments of the battery were performed and the state of charge and open circuit voltage during the experiments were recorded. And obtaining a functional relation between the state of charge and the open-circuit voltage in a fitting mode. Preferably, the functional relationship between the charge state and the open circuit voltage can be expressed as: u shapeoc＝-0.39909×SOC2+1.4069 × SOC + 3.0966; wherein U isocRepresents an open circuit voltage; SOC represents a charged state, let UocThe second equation in the first set of equations may be derived, where a equals-0.39909, B equals 1.4069, and C equals 3.0966, but is not limited thereto.
Referring to fig. 3, on the basis of the above embodiments of the present invention, in the embodiments of the present invention, the step of acquiring the polarized voltage includes:
s31: obtaining the polarization resistance, the polarization capacitance and the load current of the battery;
it should be noted that the polarization resistance and the polarization capacitance are fixed parameters of the battery, and are determined before the battery is shipped from the factory.
S32: calculating to obtain polarization voltage according to a first equation, the polarization resistor, the polarization capacitor and the load current;
the first process: 1/UP＝-UP/(Rp×Cp)+I/Cp；
Wherein U ispRepresenting the polarization voltage, I representing the load current, RpDenotes the polarization resistance, CpRepresenting the polarization capacitance.
It should be noted that the first equation can be determined from the Thevenin equivalent circuit model as shown in FIG. 4, and thus the polarization voltage is obtained.
As shown in fig. 5, on the basis of the foregoing embodiments of the present invention, in the embodiments of the present invention, the step of calculating the maximum available power amount according to the state of charge every second preset time period includes:
s51: obtaining a charge state sequence according to the charge time corresponding to each charge state, wherein the time length between the charge times corresponding to two adjacent charge states in the charge state sequence is a second preset time length;
it should be noted that the maximum available charge of a battery varies slowly with time, as opposed to the state of charge; therefore, the time scale needs to be re-planned, and the corresponding maximum available electric quantity is calculated by a larger time scale. For example, the resulting states of charge include: t is tiA state of charge at time, wherein i ═ 1,2,3 … … L; l is a larger positive integer, for example, L may be equal to 100, but is not limited thereto. The time scale is re-programmed, and then 10 maximum available electric quantities can be calculated according to the corresponding states of charge when i is 1, 11, 21, 31, 41, 51, 61, 71, 81 and 91. The second preset time period is usually larger, and can be set by self according to experience, but is not limited to this.
S52: calculating the maximum available power consumption corresponding to each charge state in the charge state sequence according to a second equation;
the second equation: SOC ═ 1- ([ j ] i × η × dt)/Q;
wherein SOC represents the state of charge, i represents the load current, Q represents the maximum available electric quantity, eta represents the coulombic efficiency factor, and t represents the battery working time.
It should be noted that the ampere-hour integral method can represent the relationship between the state of charge and the maximum available electric quantity, and the maximum available electric quantity can be calculated by the second equation.
Certainly, the time can also be planned in a double time scale, and the relationship between each battery parameter and the charge state and the maximum available electric quantity at each moment is determined; by tk,lAs any time in a dual time scale, wherein L is used as a time index of a microscopic time scale, and L is 1, 2. L is the level of time scale separation; k is used as a time index k of a macroscopic time scale, which is 1, 2., ∞; and tk,l＝tk,0+l×T，tk,0＝tk-1,L(ii) a T is the sampling period.
First, assuming that the battery is a time-invariant system and the load current is kept constant in each sampling interval T, an analytic solution of the first equation, i.e., the third equation, is obtained, where the battery employs the thevenin equivalent circuit model shown in fig. 4, I in fig. 4 represents the load current, RpDenotes the polarization resistance, CpDenotes polarization capacitance, U denotes terminal voltage, RtIndicating the internal resistance of the battery;
a third program:
discretizing the third equation on a multi-time scale to obtain a fourth equation;
the fourth process:
let Zk,lSOC, and according to a second equation: SOC ═ 1- ([ j ] i × η × dt)/Q; a fifth equation can be obtained;
the fifth equation:
another taup＝Rp×CpAccording to the third equation, the fourth equation and the fifth equation, a sixth equation can be obtained;
in the sixth aspect:
according to the sixth aspect, the discretized state transition and measurement equation on the multiple time scales is determined to be the seventh aspect:
the seventh process:
wherein,
and Uk,lIs shown at tk,lA battery terminal voltage measurement at a time.
Of course, the seventh equation can also be rewritten as a nonlinear state space model:
transferring: x is the number ofk,l+1＝F(xk,l,uk,l,θk)+wk,l,θk+1＝θk+rk；
Measurement: y isk,l＝G(xk,l,uk,l)+vk,l；
Wherein x isk,lAt a time tk,l＝tk,0+ L · T, L ═ 1, 2.., the system state vector at L, T is the fixed time interval between two adjacent measurement points, k, L denote the sequence numbers of the macroscopic and microscopic time scales. L represents the level of time scale separation, and xk,0＝xk-1,L。θkIs a time tk,0Vectors of time system model parameters; u. ofk,lIs an input to an external observation source; y isk,lIs a vector of system observations (or measurements). w is ak,lAnd rkProcess noise vectors, which are state and model parameters, respectively; v. ofk,lIs a vector of measurement noise; f and G are the state transfer and state measurement functions, respectively.
According to the nonlinear state space model, updating is carried out on a macroscopic time scale and a microscopic time scale, and before updating is started, the model parameter theta, the state x and the covariance matrix sigma of estimation errors need to be updated firstlyθSum ΣxInitialization:
on a macroscopic time scale:
and (3) performing macroscopic time updating:
performing state prediction on a macroscopic time scale:
performing measurement update on a macroscopic time scale:
on a microscopic time scale:
performing microscopic time updating:
measurement update on microscopic time scale:
where a Jacobian matrix can be defined:
as shown in fig. 6 to 8, according to still another aspect of the present invention, there is provided a battery charge amount acquiring apparatus including:
the charge state calculating module 61 is used for acquiring a battery parameter every other first preset time, and calculating the charge state of the battery according to the battery parameter;
and the maximum available power calculation module 62 is configured to calculate the maximum available power according to the calculated state of charge every second preset time, where the second preset time is longer than the first preset time.
The state of charge calculation module 61 includes:
an obtaining unit 611, configured to obtain a terminal voltage, a polarization voltage, a load current, and a battery internal resistance of the battery every first preset duration;
the first calculating unit 612 is configured to calculate a state of charge of the battery and a charging time corresponding to the state of charge according to the first equation group, the currently acquired terminal voltage, polarization voltage, load current, and internal resistance of the battery, where the charging time is a time at which the state of charge is acquired;
a first set of equations:
wherein U represents terminal voltage, UpRepresenting the polarization voltage, RtThe method comprises the following steps of representing internal resistance of a battery, representing load current, f (z) representing a functional relation between a state of charge and an open-circuit voltage, A representing a quadratic coefficient of the functional relation between the state of charge and the open-circuit voltage, B representing a primary coefficient of the functional relation between the state of charge and the open-circuit voltage, C representing a constant term of the functional relation between the state of charge and the open-circuit voltage, and SOC representing the state of charge.
The maximum available electric power amount calculation module 62 includes:
the second calculating unit 621 is configured to obtain a charge state sequence according to the charge time corresponding to each charge state, where a time length between the charge times corresponding to two adjacent charge states in the charge state sequence is a second preset time length;
the third calculating unit 622 is configured to calculate, according to the second equation, a maximum available electric quantity corresponding to each state of charge in the state of charge sequence;
the second equation: SOC ═ 1- ([ j ] i × η × dt)/Q;
wherein SOC represents the state of charge, i represents the load current, Q represents the maximum available electric quantity, eta represents the coulombic efficiency factor, and t represents the battery working time.
It should be noted that, a polarization voltage obtaining module may be further included, which is used for obtaining the polarization resistance, the polarization capacitance and the load current of the battery;
calculating to obtain polarization voltage according to a first equation, the polarization resistor, the polarization capacitor and the load current;
the first process: 1/UP＝-UP/(Rp×Cp)+I/Cp；
Wherein U ispRepresenting the polarization voltage, I representing the load current, RpDenotes the polarization resistance, CpRepresenting the polarization capacitance.
In the embodiment of the invention, different time scales are adopted when the charge state and the maximum available electric quantity are calculated; the first preset time is used as a micro time scale when the charge state is calculated, and the second preset time is used as a macro time scale when the maximum available power consumption is calculated, so that the influence of a single time scale on the calculation time is avoided.
According to still another aspect of the present invention, there is provided an automobile including: the battery capacity acquisition device provided by the embodiments of the invention is provided.
In the embodiment of the invention, different time scales are adopted when the charge state and the maximum available electric quantity are calculated; the first preset time is used as a micro time scale when the charge state is calculated, and the second preset time is used as a macro time scale when the maximum available power consumption is calculated, so that the influence of a single time scale on the calculation time is avoided.
In accordance with still another aspect of the present invention, there is provided a battery system including: the invention further provides a battery power acquisition method, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the steps of the battery power acquisition method provided by the embodiments of the invention when being executed by the processor.
In the embodiment of the invention, different time scales are adopted when the charge state and the maximum available electric quantity are calculated; the first preset time is used as a micro time scale when the charge state is calculated, and the second preset time is used as a macro time scale when the maximum available power consumption is calculated, so that the influence of a single time scale on the calculation time is avoided.
According to still another aspect of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the method for acquiring battery power provided by the above embodiments of the invention.
In the embodiment of the invention, different time scales are adopted when the charge state and the maximum available electric quantity are calculated; the first preset time is used as a micro time scale when the charge state is calculated, and the second preset time is used as a macro time scale when the maximum available power consumption is calculated, so that the influence of a single time scale on the calculation time is avoided.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.
Claims (8)
1. A method for acquiring battery capacity is characterized by comprising the following steps:
acquiring a battery parameter every other first preset time, and calculating according to the battery parameter to obtain the charge state of the battery;
calculating to obtain the maximum available power consumption every second preset time according to the charge state obtained by calculation, wherein the second preset time is longer than the first preset time;
the step of calculating the maximum available power consumption according to the state of charge every second preset time comprises the following steps:
obtaining a charge state sequence according to the charge time corresponding to each charge state, wherein the time length between the charge times corresponding to two adjacent charge states in the charge state sequence is a second preset time length;
calculating to obtain the maximum available electric quantity corresponding to each charge state in the charge state sequence according to a second equation;
the second equation: SOC ═ 1- ([ j ] i × η × dt)/Q;
wherein SOC represents the state of charge, i represents the load current, Q represents the maximum available electric quantity, eta represents the coulombic efficiency factor, and t represents the battery working time.
2. The method according to claim 1, wherein the step of obtaining the battery parameter every first preset time period and calculating the state of charge according to the battery parameter comprises:
acquiring terminal voltage, polarization voltage, load current and internal resistance of the battery of one time every a first preset time;
calculating the state of charge of the battery and the charging time corresponding to the state of charge according to the first equation group, the currently acquired terminal voltage, polarization voltage, load current and internal resistance of the battery, wherein the charging time is the time when the state of charge is acquired;
a first set of equations:
wherein U represents terminal voltage, UpRepresenting the polarization voltage, RtThe method comprises the following steps of representing internal resistance of a battery, representing load current, f (z) representing a functional relation between a charge state and an open-circuit voltage, A representing a quadratic term coefficient of the functional relation between the charge state and the open-circuit voltage, B representing a primary term coefficient of the functional relation between the charge state and the open-circuit voltage, C representing a constant term of the functional relation between the charge state and the open-circuit voltage, and SOC representing the charge state.
3. The method for obtaining battery power according to claim 2, wherein the step of obtaining the polarization voltage comprises:
obtaining the polarization resistance, the polarization capacitance and the load current of the battery;
calculating to obtain polarization voltage according to a first equation, the polarization resistor, the polarization capacitor and the load current;
the first process: 1/UP＝-UP/(Rp×Cp)+I/Cp；
Wherein U ispRepresenting the polarization voltage, I representing the load current, RpDenotes the polarization resistance, CpRepresenting the polarization capacitance.
4. An apparatus for obtaining battery power, comprising:
the system comprises a charge state calculation module, a charge state calculation module and a charge state calculation module, wherein the charge state calculation module is used for acquiring a battery parameter every first preset time length and calculating the charge state of the battery according to the battery parameter;
the maximum available electric quantity calculation module is used for calculating the maximum available electric quantity every second preset time length according to the charge state obtained by calculation, wherein the second preset time length is longer than the first preset time length;
wherein the maximum available power calculation module comprises:
the second calculating unit is used for obtaining a charge state sequence according to the charge time corresponding to each charge state, wherein the time length between the charge times corresponding to two adjacent charge states in the charge state sequence is a second preset time length;
the third calculation unit is used for calculating and obtaining the maximum available electric quantity corresponding to each charge state in the charge state sequence according to a second equation;
the second equation: SOC ═ 1- ([ j ] i × η × dt)/Q;
wherein SOC represents the state of charge, i represents the load current, Q represents the maximum available electric quantity, eta represents the coulombic efficiency factor, and t represents the battery working time.
5. The device for acquiring battery power according to claim 4, wherein the state of charge calculation module comprises:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the terminal voltage, the polarization voltage, the load current and the internal resistance of the battery of one time every a first preset time;
the first calculation unit is used for calculating the charge state of the battery and the charge time corresponding to the charge state according to the first program group, the currently acquired terminal voltage, polarization voltage, load current and battery internal resistance, wherein the charge time is the time for acquiring the charge state;
a first set of equations:
wherein U represents terminal voltage, UpRepresenting the polarization voltage, RtIndicating internal resistance of the batteryWherein, I represents the load current, f (z) represents the functional relation between the state of charge and the open-circuit voltage, A represents the quadratic term coefficient of the functional relation between the state of charge and the open-circuit voltage, B represents the first order coefficient of the functional relation between the state of charge and the open-circuit voltage, C represents the constant term of the functional relation between the state of charge and the open-circuit voltage, and SOC represents the state of charge.
6. An automobile, characterized by comprising the battery level acquisition device according to any one of claims 4 to 5.
7. A battery system, comprising: memory, processor and computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the battery power acquisition method according to any one of claims 1 to 3.
8. A computer-readable storage medium, characterized in that a computer program is stored thereon, which, when being executed by a processor, carries out the steps of the battery charge level acquisition method according to any one of claims 1 to 3.
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