FORM 2 THE PATENTS ACT, 1970
(39 of 1970)
& The Patent Rules, 2003
COMPLETE SPECIFICATION
1.TITLE OF THE INVENTION:
METHOD FOR DETERMINING STATE PARAMETERS OF POWER BATTERY
AND ELECTRONIC EQUIPMENT
2. APPLICANT:
Name: OCTILLION POWER SYSTEMS INDIA PRIVATE LIMITED Nationality: India
Address: Plot No. 302, Sector 10, Bhosari, MIDC, PUNE, Pune, Maharashtra, 411026, India.
3. PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the invention and the manner in which it is to be performed:

Technical Field
The present disclosure relates to the technical field of battery management, and particularly to a method for determining state parameters of a power battery and electronic equipment.
Background Art
The power battery is a power source of electric vehicles, and its operating performance greatly affects mileage of the vehicles. Therefore, it is necessary to monitor the power battery.
The state of charge (SOC) of the battery and the state of health (SOH) of the battery are the most important parameters in a battery management system, and by estimating the SOC and the SOH of the battery, performance differences between battery packs can be judged, occurrence of over¬charging and over-discharging of the battery can be avoided, and driving range of the electric vehicles can be estimated, therefore, it is quite necessary and of important practical significance to accurately estimate the SOC and the SOH of the battery. Since the SOC and the SOH cannot be directly measured, and the battery exhibits a very strong non-linear change when the electric vehicle runs, the accuracy of the existing SOC and SOH estimation algorithms is generally low.
Summary
An objective of the present disclosure lies in providing a method for determining state parameters of a power battery and electronic equipment, which can improve the accuracy of determining the state parameter of the power battery.
In order to achieve the above objective, a technical solution adopted in the embodiments of the present disclosure is as follows:
in a first aspect, an embodiment of the present disclosure provides a method for determining state parameters of a power battery, wherein the method includes steps of:
acquiring a first capacity increment curve and a second capacity increment curve of the power battery, wherein the first capacity increment curve represents a corresponding relationship between a capacity increment and an SOC value under different operating conditions, the second capacity increment curve represents a corresponding relationship between the capacity increment and an SOH value under different operating conditions, and the first capacity increment curve and the second capacity increment curve are constructed from charging data during charging and discharging of the power battery under different operating conditions;
determining a third capacity increment curve and a fourth capacity increment curve of the power battery, wherein the third capacity increment

curve represents a corresponding relationship between the capacity increment and the SOC value in a preset period of time, and the fourth capacity increment curve represents a corresponding relationship between the capacity increment and the SOH value in the preset period of time; and
determining the SOC value of the power battery based on the first capacity increment curve and the third capacity increment curve, and determining the SOH value of the power battery based on the second capacity increment curve and the fourth capacity increment curve,
wherein the SOC value and the SOH value is taken as the state parameters of the power battery.
In an optional embodiment, the step of determining the SOC value of the power battery based on the first capacity increment curve and the third capacity increment curve includes:
acquiring a first inflection point in the third capacity increment curve;
determining an operating condition parameter corresponding to the first inflection point;
acquiring a plurality of second inflection points in the first capacity increment curve;
determining a target inflection point matched with the operating condition parameter of the first inflection point from each of the second inflection points;
determining a first SOC value corresponding to the target inflection point; and
taking the first SOC value corresponding to the target inflection point as the SOC value of the power battery.
In an optional embodiment, the method further includes:
determining a second SOC value corresponding to the first inflection point based on the third capacity increment curve;
calculating a first difference between the second SOC value and the first SOC value; and
correcting the second SOC value to the first SOC value when the first difference is greater than or equal to a first preset threshold.
In an optional embodiment, the method further includes:
outputting and displaying the second SOC value as a display SOC;
determining a charging and discharging interval to which the second SOC value belongs;
determining a rate value of the first difference; and

compensating for the charging and discharging interval of the display SOC based on the rate value, so that the display SOC approximates to the first SOC value until the display SOC is consistent with the first SOC value.
In an optional embodiment, the method further includes:
determining a current temperature of the power battery;
determining current charging and discharging power of the power battery from a charging and discharging power MAP table based on the SOC value and the current temperature of the power battery;
judging, based on the current charging and discharging power, whether the current charging and discharging power needs to be switched; and
if yes, switching the current charging and discharging power to target charging and discharging power, wherein when the current charging and discharging power is a peak value, the target charging and discharging power is a continuous value, and when the current charging and discharging power is a continuous value, the target charging and discharging power is a peak value.
In an optional embodiment, the step of judging based on the current charging and discharging power whether the current charging and discharging power needs to be switched includes:
acquiring running time corresponding to the current charging and discharging power from the charging and discharging power MAP table;
calculating a first power value in which the current charging and discharging power is run for the running time;
calculating in real time a second power value of the power battery at a current moment T based on the current charging and discharging power;
calculating a third power value of the power battery at a second moment Tn based on the current charging and discharging power;
calculating a second difference between the third power value and the second power value; and
determining that the current charging and discharging power needs to be switched when the second difference is greater than the first power value.
In an optional embodiment, the method further includes:
acquiring a voltage of the power battery in real time; and
determining that the current charging and discharging power needs to be switched when the voltage is less than or equal to the second preset threshold.
In an optional embodiment, the step of determining the SOH value of the power battery based on the second capacity increment curve and the fourth capacity increment curve includes:

determining a first capacity increment of the power battery from the fourth capacity increment curve, wherein the first capacity increment is a height value of a characteristic peak in the fourth capacity increment curve;
determining each second capacity increment in the second capacity increment curve, wherein the second capacity increment is a height value of a characteristic peak in the second capacity increment curve;
determining a target capacity increment matched with the first capacity increment from each of the second capacity increments;
determining a rated capacity of the power battery; and
calculating the SOH value of the power battery based on the target capacity increment and the rated capacity.
In an optional embodiment, when a plurality of the first capacity increments are contained, the step of determining a target capacity increment matched with the first capacity increment from each of the second capacity increments includes:
determining each target capacity increment matched with each of the first capacity increments from each of the second capacity increments;
the step of calculating the SOH value of the power battery based on the target capacity increment and the rated capacity includes:
determining a weight value corresponding to each of the target capacity increments respectively;
calculating respective product of each of the target capacity increments and corresponding weight value;
calculating a sum of respective product; and
calculating a ratio of the sum to the rated capacity as the SOH value of the power battery.
In a second aspect, an embodiment of the present disclosure provides a state parameter determining device of a power battery, wherein the device includes: an acquiring module and a determining module;
the acquiring module is configured to acquire a first capacity increment curve and a second capacity increment curve of the power battery, wherein the first capacity increment curve represents a corresponding relationship between the capacity increment and the SOC value under different operating conditions, the second capacity increment curve represents a corresponding relationship between the capacity increment and the SOH value under different operating conditions, and the first capacity increment curve and the second capacity increment curve are constructed from charging data during charging and discharging of the power battery under different operating conditions; and

the determining module is configured to determine a third capacity increment curve and a fourth capacity increment curve of the power battery, wherein the third capacity increment curve represents a corresponding relationship between the capacity increment and the SOC value in the preset period of time, and the fourth capacity increment curve represents a corresponding relationship between the capacity increment and the SOH value in the preset period of time; the SOC value of the power battery is determined based on the first capacity increment curve and the third capacity increment curve, and the SOH value of the power battery is determined based on the second capacity increment curve and the fourth capacity increment curve; and the determining module takes the SOC value and the SOH value as state parameters of the power battery.
In a third aspect, an embodiment of the present disclosure provides electronic equipment, including a memory and a processor, wherein the memory stores a computer program, and the processor, when executes the computer program, implements the steps of the method for determining state parameters of a power battery.
In a fourth aspect, an embodiment of the present disclosure provides a computer readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method for determining state parameters of a power battery.
The present disclosure has the following beneficial effects:
in the present disclosure, the first capacity increment curve and the second capacity increment curve of the power battery are acquired, the third capacity increment curve and the fourth capacity increment curve of the power battery are determined, the SOC value of the power battery is determined based on the first capacity increment curve and the third capacity increment curve, and the SOH value of the power battery is determined based on the second capacity increment curve and the fourth capacity increment curve, and the SOC value and the SOH value are taken as state parameters of the power battery, thus improving the accuracy of the state parameters of the power battery, and further improving the driving experience.
Brief Description of Drawings
In order to more clearly illustrate technical solutions of embodiments of the present disclosure, drawings which need to be used in the embodiments will be introduced briefly below, and it should be understood that the drawings below merely show embodiments of the present disclosure, therefore, they should not be considered as limitation to the scope, and those ordinarily skilled in the art still could obtain other relevant drawings according to these drawings, without using any creative efforts.
FIG. 1 is a block schematic diagram of electronic equipment provided in an embodiment of the present disclosure;

FIG. 2 is a first schematic flowchart of a method for determining state parameters of a power battery provided in an embodiment of the present disclosure;
FIG. 3 is a second schematic flowchart of a method for determining state parameters of a power battery provided in an embodiment of the present disclosure;
FIG. 4 is a third schematic flowchart of a method for determining state parameters of a power battery provided in an embodiment of the present disclosure;
FIG. 5 is a fourth schematic flowchart of a method for determining state parameters of a power battery provided in an embodiment of the present disclosure;
FIG. 6 is a fifth schematic flowchart of a method for determining state parameters of a power battery provided in an embodiment of the present disclosure;
FIG. 7 is a sixth schematic flowchart of a method for determining state parameters of a power battery provided in an embodiment of the present disclosure;
FIG. 8 is a seventh schematic flowchart of a method for determining state parameters of a power battery provided in an embodiment of the present disclosure;
FIG. 9 is an eighth schematic flowchart of a method for determining state parameters of a power battery provided in an embodiment of the present disclosure; and
FIG. 10 is a structural block diagram of a device for determining state parameters of a power battery provided in an embodiment of the present disclosure.
Detailed Description of Embodiments
In order to make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings in the embodiments of the present disclosure, and apparently, only some but not all embodiments of the present disclosure are described. Generally, components in the embodiments of the present disclosure, as described and shown in the drawings herein, may be arranged and designed in various different configurations.
Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the claimed scope of the present disclosure, but merely represents chosen embodiments of the present disclosure. On the basis of the embodiments of the present disclosure, all of other embodiments, obtained by a person ordinarily skilled in

the art without using any creative efforts, should fall within the scope of protection of the present disclosure.
It should be noted that similar reference signs and letters represent similar items in the following drawings, therefore, once a certain item is defined in one drawing, it is not needed to be defined or explained in subsequent drawings.
In the description of the present disclosure, it should be noted that orientation or positional relationships indicated by terms such as “upper”, “lower”, “inner” and “outer”, if appear, are based on orientation or positional relationships as shown in the drawings, or orientation or positional relationships of a product of the present disclosure when being conventionally placed in use, merely for facilitating describing the present disclosure and simplifying the description, rather than indicating or implying that related devices or elements have to be in the specific orientation or configured and operated in a specific orientation, therefore, they should not be construed as limitation to the present disclosure.
Besides, terms such as “first” and “second” are merely for distinguishing the description, but should not be construed as indicating or implying importance in the relativity.
In the description of the present disclosure, it should be further noted that, unless otherwise specifically regulated and defined, the terms “set”, “install”, “link”, and “connect” should be understood in a broad sense, for example, a connection may be a fixed connection, a detachable connection, or an integrated connection; it may be a mechanical connection or an electrical connection; it may be direct joining or indirect joining through an intermediary, and it also may be inner communication between two elements. For a person ordinarily skilled in the art, specific meanings of the above-mentioned terms in the present disclosure can be understood according to specific circumstances.
Through a lot of researches, the inventor found that the accuracy of the existing estimation algorithm for SOC and SOH is relatively low.
In view of the finding of the above problem, the present embodiment provides a method for determining state parameters of a power battery and electronic equipment, wherein by acquiring a first capacity increment curve and a second capacity increment curve of the power battery, a third capacity increment curve and a fourth capacity increment curve of the power battery can be determined, an SOC value of the power battery is determined based on the first capacity increment curve and the third capacity increment curve, and an SOH value of the power battery is determined based on the second capacity increment curve and the fourth capacity increment curve, the SOC value and the SOH value are taken as the state parameters of the power battery, to improve the accuracy of determining the state parameters of the power battery, and further improve driving experience. The solution provided in the present embodiment is described in detail below.
The present embodiment provides electronic equipment that can determine state parameters of a power battery. In a possible implementation mode, the

electronic equipment may be a user terminal, for example, the electronic equipment may be, but is not limited to, a server, a smart phone, a personal computer (PC), a tablet computer, a personal digital assistant (PDA), a mobile internet device (MID), and the like.
Referring to FIG. 1, FIG. 1 is a structural schematic diagram of electronic equipment 100 provided in an embodiment of the present disclosure. The electronic equipment 100 further may include more or fewer components than those shown in FIG. 1, or have a different configuration than that shown in FIG. 1. Various components shown in FIG. 1 can be realized by means of hardware, software, or a combination thereof.
The electronic equipment 100 includes a state parameter determining device 110 of a power battery, a memory 120, and a processor 130.
Various elements of the memory 120 and the processor 130 are electrically connected to each other directly or indirectly to realize transmission or interaction of data. For example, electrical connections can be realized between these elements via one or more communication buses or signal lines. The state parameter determining device 110 of the power battery includes at least one software functional module that can be stored in the memory 120 in a form of software or firmware or solidified in an operating system (OS) of the electronic equipment 100. The processor 130 is configured to execute executable modules stored in the memory 120, for example, software functional module, computer program and the like included in the state parameter determining device 110 of the power battery.
In the above, the memory 120 may be, but not limited to, random access memory (RAM), read only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electric erasable programmable read-only memory (EEPROM) and so on. Herein, the memory 120 is configured to store programs, and the processor 130 executes the programs upon receipt of an execution instruction.
Referring to FIG. 2, FIG. 2 is a flowchart of a method for determining state parameters of a power battery applicable to the electronic equipment 100 in FIG. 1, and various steps included in the method are illustrated in detail below.
Step 201: acquiring a first capacity increment curve and a second capacity increment curve of the power battery.
In the above, the first capacity increment curve represents a corresponding relationship between the capacity increment and the SOC value under different operating conditions, the second capacity increment curve represents a corresponding relationship between the capacity increment and the SOH value under different operating conditions, and the first capacity increment curve and the second capacity increment curve are constructed from charging data during charging and discharging of the power battery under different operating conditions.
In an example, a capacity increment reflecting an electrochemical characteristic of a battery is obtained by the first capacity increment curve and

the second capacity increment curve according to a charging and discharging voltage curve of the power battery and based on battery testing means and method, and influences on the battery under different operating conditions are analyzed by using a capacity increment analyzing method, to establish a corresponding relationship between the capacity increment inside the power battery and the SOC value and the SOH value of the power battery.
It should be noted that the SOC value of the power battery, representing a state of charge of the power battery, is used to reflect remaining capacity of the battery, and is numerically defined as a ratio of the remaining capacity to a total capacity of the power battery, commonly represented by a percentage. Different operating conditions may be different charging and discharging rates, different temperatures, and different aging degrees, wherein the aging degrees of the power battery may be corresponding to the number of charging and discharging cycles of the power battery.
A preset period of time may be set to be one week, one month, one year, and so on, which is not specifically limited in the embodiments of the present disclosure.
Step 202: determining a third capacity increment curve and a fourth capacity increment curve of the power battery.
In the above, the third capacity increment curve represents a corresponding relationship between the capacity increment and the SOC value in the preset period of time, and the fourth capacity increment curve represents a corresponding relationship between the capacity increment and the SOH value in the preset period of time.
When the power battery is in an operating state, the third capacity increment curve and the fourth capacity increment curve of the power battery are constructed based on an actual operating condition and an electricity using situation of the power battery. Herein, the electricity using situation of the power battery may be a discharging state and a charging state, and the electricity using situation may be a power consumption situation and a charging situation.
Step 203: determining the SOC value of the power battery based on the first capacity increment curve and the third capacity increment curve, and determining the SOH value of the power battery based on the second capacity increment curve and the fourth capacity increment curve.
It should be noted that the first capacity increment curve and the second capacity increment curve are actually capacity increment curves of the power battery in an offline state, that is, the first capacity increment curve and the second capacity increment curve represent corresponding theoretical performance conditions of the power battery under different operating conditions. The third capacity increment curve and the fourth capacity increment curve are actual performance situations of the power battery in an operating state.

The corresponding theoretical performance situations of the power battery under different operating conditions are compared and analyzed with the actual performance situation of the power battery in the operating state, to calibrate a corresponding relationship between a characteristic peak in the first capacity increment curve and the SOC, and a corresponding relationship between a characteristic peak in the second capacity increment curve and the SOH, wherein an ordinate of the first capacity increment curve is a capacity increment, an abscissa of the first capacity increment curve is the SOC value, an ordinate of the second incremental amount curve is a capacity increment, an abscissa of the second capacity increment curve is the SOH value, a characteristic peak in the third capacity increment curve captured in the actual operating state is calibrated, and a characteristic peak in the fourth capacity increment curve captured in the actual operating state is calibrated.
In the above, the SOH value can be understood as a percentage of the current capacity to factory capacity of the power battery.
Step 204: taking the SOC value and the SOH value as state parameters of the power battery.
Finally, the SOC value of the power battery is determined based on the first capacity increment curve and the third capacity increment curve, the SOH value of the power battery is determined based on the second capacity increment curve and the fourth capacity increment curve, and the SOC value and the SOH value are taken as state parameters of the power battery.
Since the influences of different operating conditions on the state parameter evaluation of the power battery are not considered in the prior art, the state parameters of the power battery determined in the prior art is not accurate enough, therefore, based on the first capacity increment curve, the second capacity increment curve, the third capacity increment curve, and the fourth capacity increment curve provided in the present disclosure, it is considered that different operating conditions may affect the state parameters of the power battery, so that the SOC value and the SOH value of the power battery are finally determined more accurately.
Based on the first capacity increment curve and the third capacity increment curve, there are many implementation modes for determining the SOC value of the power battery. In an implementation mode, as shown in FIG. 3, the following steps are included:
step 203-1: acquiring a first inflection point in the third capacity increment curve;
step 203-2: determining an operating condition parameter corresponding to the first inflection point;
step 203-3: acquiring a plurality of second inflection points in the first capacity increment curve;
step 203-4: determining a target inflection point matched with the operating condition parameter of the first inflection point from each second inflection point;

step 203-5: determining a first SOC value corresponding to the target inflection point; and
step 203-6: taking the first SOC value corresponding to the target inflection point as the SOC value of the power battery.
In an example, a first inflection point A is acquired from the third capacity increment curve, and an operating condition parameter corresponding to the first inflection point A is determined, for example, when it is determined that the operating condition parameters corresponding to the first inflection point A are a charging rate of 1c and a temperature of 25 °C, based on the operating condition parameters corresponding to the first inflection point A, a corresponding target inflection point B is acquired from a plurality of second inflection points in the first capacity increment curve, and operating condition parameters corresponding to the first inflection point A and the target inflection point B are both the charging rate of 1c, and the temperature of 25 °C. The first SOC value corresponding to the target inflection point B is determined from the first capacity increment curve, and the first SOC value corresponding to the target inflection point B is taken as a current SOC value of the power battery.
In another example, a plurality of first inflection points are acquired from the third capacity increment curve, for example, a first inflection point C and a first inflection point D are acquired, operating condition parameters of the first inflection point C are determined as a charging rate of 1c and a temperature of 26 °, operating condition parameters of the first inflection point D are determined as a charging rate of 1c, and a temperature of 28 °, a first target inflection point corresponding to the first inflection point C is determined from a plurality of second inflection points in the first capacity increment curve, and a second target inflection point corresponding to the first inflection point D is determined from a plurality of second inflection points in the first capacity increment curve, wherein the first inflection point C and the first target inflection point are corresponding to the same operating condition parameters, and the first inflection point D and the second target inflection point are corresponding to the same operating condition parameters.
A first SOC value X corresponding to the first target inflection point is determined from the first capacity increment curve, a first SOC value Y corresponding to the second target inflection point is determined from the first capacity increment curve, a weight of the first SOC value X and a weight of the first SOC value Y are respectively determined, and the current SOC value of the power battery is calculated through the weight of the first SOC value X and the weight of the first SOC value Y.
There are various implementation modes for correcting the determined SOC value of the power battery, and in an implementation mode, as shown in FIG. 4, the following steps are included:
step 301: determining a second SOC value corresponding to the first inflection point based on the third capacity increment curve;

step 302: calculating a first difference between the second SOC value and the first SOC value; and
step 303: correcting the second SOC value to the first SOC value when the first difference is greater than or equal to a first preset threshold.
It should be noted that, the first preset threshold may be set to be 3%, 4%, and 5%, which is not specifically limited in the embodiments of the present disclosure.
After the SOC value is corrected, in order to avoid relatively poor use experience to the user due to jump in the SOC value, the second SOC value is displayed along with the first SOC value, as shown in FIG. 5, including the following steps:
step 401: outputting and displaying the second SOC value as a display SOC;
step 402: determining a charging and discharging interval to which the second SOC value belongs;
step 403: determining a rate value of the first difference; and
step 404: compensating for the charging and discharging interval of the display SOC based on the rate value, so that the display SOC approximates to the first SOC value until the display SOC is consistent with the first SOC value.
Since the estimation of the SOC value of the power battery is affected by many factors, the accuracy of the estimation of the SOC value of the power battery will gradually deteriorate over time, and at present, the second SOC value determined in the third capacity increment curve is displayed on an instrument panel, when the first difference between the second SOC value determined in the third capacity increment curve and the first SOC value determined in the first capacity increment curve is relatively large, that is, when the first difference between the second SOC value and the first SOC value is greater than the first preset threshold, the second SOC value needs to be corrected, if the second SOC value is directly corrected to the first SOC value, jump in the SOC may occur on the instrument panel, and in order to prevent this jump from being directly displayed to the user, the second SOC value needs to be compensated for, specifically:
when the power battery is in a discharging state, a difference between the first SOC value and the second SOC value is calculated, so as to determine a rate value corresponding to the first difference, and compensate for the rate value to a discharging interval from the second SOC value to 0%. When the power battery is in a charging state, based on a rate value of the first difference between the first SOC value and the second SOC value, the rate value is compensated to a charging interval from 100% SOC to the second SOC value, so that the displayed display SOC approximates to the first SOC value, until the display SOC is consistent with the first SOC value.

Exemplarily, when the first SOC value is 42%, the second SOC value is 32%, and the power battery is in the discharging state, it is determined that the first difference between the first SOC value and the second SOC value is greater than a first preset threshold value, a first rate value corresponding to the first difference is determined, the first rate value is compensated to a discharging interval from 42% to 0%, and a changing rate of the second SOC value is reduced, so that the second SOC value approximates to the first SOC value, until the second SOC value and the first SOC value are kept consistent.
When the first SOC value is 42%, the second SOC value is 35%, and the power battery is in the discharging state, it is determined that an absolute value of the first difference between the first SOC value and the second SOC value is greater than the first preset threshold value, a second first rate value corresponding to the first difference is determined, the second rate value is compensated to the discharging interval from 42% to 0%, and the changing rate of the second SOC value is reduced, so that the second SOC value approximates to the first SOC value, until the second SOC value and the first SOC value are kept consistent, wherein the second rate value is smaller than the first rate value.
Based on the SOC value of the power battery, it is judged whether the charging power of the power battery needs to be switched, as shown in FIG. 6, including the following steps:
step 501: determining a current temperature of the power battery;
step 502: determining current charging and discharging power of the power battery from a charging and discharging power MAP table based on the SOC value and the current temperature of the power battery;
step 503: judging, based on the current charging and discharging power, whether the current charging and discharging power needs to be switched; and
step 504: if yes, switching the current charging and discharging power to target charging and discharging power.
In the above, when the current charging and discharging power is a peak value, the target charging and discharging power is a continuous value, and when the current charging and discharging power is a continuous value, the target charging and discharging power is a peak value.
It should be noted that the charging and discharging power MAP table includes charging and discharging powers corresponding to different SOC values and different temperatures.
The current SOC value and the current temperature of the power battery are acquired, the corresponding charging and discharging power is searched for in the charging and discharging power MAP table, and the charging and discharging power found in the charging and discharging power MAP table is taken as the current charging and discharging power of the power battery.

Exemplarily, when the power battery is in the discharging state, the current SOC value and the current temperature are determined, and a current discharging power of the power battery is searched for in the charging and discharging power MAP table. When the power battery is in the charging state, the current SOC value and the current temperature are determined, and the current charging power of the power battery is searched for in the charging and discharging power MAP table.
The current charging and discharging power is monitored and processed to judge whether the current charging and discharging power needs to be switched. When the current charging and discharging power needs to be switched, the current charging and discharging power is switched to the target charging and discharging power.
When the current charging and discharging power is the peak value, and the current charging and discharging power needs to be switched, the peak value is switched to a continuous value; and when the current charging and discharging power is a continuous value, and the current charging and discharging power needs to be switched, the continuous value is switched to the peak value.
When the current charging and discharging power is the peak value, the target charging and discharging power is a continuous value; and when the current charging and discharging power is a continuous value, the target charging and discharging power is the peak value.
There are a plurality of implementation modes for how to determine whether the current charging and discharging power needs to be switched. In an implementation mode, as shown in FIG. 7, the following steps are included:
step 502-1: acquiring running time corresponding to the current charging and discharging power from the charging and discharging power MAP table.
It should be noted that different charging and discharging power is corresponding to different running time. For example, when the current charging and discharging power determined from the charging and discharging power MAP table is the peak value, the running time corresponding to the peak value is 10 s; and when the current charging and discharging power determined from the charging and discharging power MAP table is a continuous value, the running time corresponding to the continuous value is 60 s.
Step 502-2: calculating a first power value in which the current charging and discharging power is run for the running time.
When the current charging and discharging power is A, the running time corresponding to the current charging and discharging power A is determined to be 10 s from the charging and discharging power MAP table, and then A*10 is taken as the first power value.
Step 502-3: calculating in real time a second power value of the power battery at a current moment T based on the current charging and discharging power;

step 502-4: calculating a third power value of the power battery at a second moment Tn based on the current charging and discharging power;
step 502-5: calculating a second difference between the third power value and the second power value; and
step 502-6: determining that the current charging and discharging power needs to be switched when the second difference is greater than the first power value.
In an example, based on the charging and discharging current and voltage of the power battery, the second power value at the current moment T based on the current charging and discharging power, and a third power value at the moment Tn based on of the current charging and discharging power are calculated, wherein the moment Tn is greater than the moment T. For example, the second power value of the power battery at the moment T based on the current charging and discharging power acquired in real time is 10, and the acquired third power value of the power battery at the moment Tn based on the current charging and discharging power is 100, it is determined that the second difference between the third power value and the second power value is 90, the first power value in which the current charging and discharging power is run for the running time is calculated to be 80, and the second difference is compared with the first power value, that is, the second difference is greater than the first power value, it is determined that the current charging and discharging power needs to be switched, and when the current charging and discharging power is the peak value, the current charging and discharging power is switched to the continuous value, that is, the target charging and discharging power.
In another example, an integral area based on the current charging and discharging power during the running time is calculated, i.e., when the current charging and discharging power is the peak value, the integral area is PwrPeak, and when the current charging and discharging power is a continuous value, the integral area is PwrCont. Changes in the charging and discharging current and the total voltage of the power battery are monitored in real time, and an integral area from the moment T to the moment Tn is acquired in real time, when the current charging and discharging power is the peak value, the integral area from the moment T to the moment Tn is compared with the integral area PwrPeak, wherein when the integral area from the moment T to the moment Tn is greater than the integral area PwrPeak, it is determined that the current charging and discharging power needs to be switched. When the current charging and discharging power value is a continuous value, the integral area from the moment T to the moment Tn is compared with the integral area PwrPeak, wherein when the integral area from the moment T to the moment Tn is greater than the integral area PwrPeak, it is determined that the current charging and discharging power needs to be switched.
In another implementation mode, as shown in FIG. 8, the following steps are included:
steps 502-7: acquiring a voltage of the power battery in real time; and

steps 502-8: determining that the current charging and discharging power needs to be switched when the voltage is less than or equal to the second preset threshold.
When the current charging and discharging power is switched to the target charging and discharging power, smoothing processing is used to smoothly approximate the current charging and discharging power to the target charging and discharging power at a fixed time (or a fixed rate).
There are many implementation modes for determining the SOH value of the power battery based on the second capacity increment curve and the fourth capacity increment curve. In an implementation mode, as shown in FIG. 9, the following steps are included:
step 203-7: determining a first capacity increment of the power battery from the fourth capacity increment curve.
In the above, the first capacity increment is a height value of the characteristic peak in the fourth capacity increment curve.
Step 203-8: determining each second capacity increment from the second capacity increment curve.
In the above, the second capacity increment is a height value of the characteristic peak in the second capacity increment curve. The characteristic peak is a peak value of the curve.
Step 203-9: determining a target capacity increment matched with the first capacity increment from each second capacity increment.
Step 203-10: determining a rated capacity of the power battery.
Step 203-11: calculating the SOH value of the power battery based on the target capacity increment and the rated capacity.
After undergoing different charging and discharging cycles, aging degrees of the power battery will be different, so that a fourth capacity increment curve is obtained when the power battery is in an actual use process, and a second capacity increment curve is obtained when the power battery is in an offline state, and under the same aging degree, a corresponding SOH value difference theoretically should not be large. Therefore, the SOH value of the power battery is determined on the basis of the fourth capacity increment curve and the second capacity increment curve.
Exemplarily, a certain first capacity increment is determined as 730 from the fourth capacity increment curve, and the target capacity increment 750 matched with the first capacity increment is determined from the second capacity increment curve based on the first capacity increment 730. A rated capacity A of the power battery is determined, and the SOH value of the power battery is determined based on the rated capacity A and the target capacity increment 750.

There are many implementation modes for determining the target capacity increment from the second capacity increment curve based on the first capacity increment. In an implementation mode, each second capacity increment in the second capacity increment curve is determined, a difference between the first capacity increment and each second capacity increment is calculated respectively, and a second capacity increment corresponding to a minimum difference is determined from each difference as the target capacity increment.
In another example: when a plurality of first capacity increments are contained, a weight value corresponding to each target capacity increment is determined respectively, respective product of each target capacity increment and corresponding weight value is calculated, the sum of the respective product is calculated, and a ratio of the sum to the rated capacity is calculated as the SOH value of the power battery.
It should be noted that the sum of weight values of the target capacity increments is 1.
Exemplarily, when determining a plurality of first capacity increments, a first capacity increment A and a first capacity increment B are included, a first target capacity increment is determined from the second capacity increment curve based on the first capacity increment A, a second target capacity increment is determined from the second capacity increment curve based on the first capacity increment B, respectively, a weight value of the first target capacity increment is determined as 0.3, and a weight value of the second capacity increment is determined as 0.7, then a sum of the first target capacity increment *0.3 and the second target capacity increment *0.7 is calculated, and the SOH value of the power battery is calculated based on the rated capacity and the sum.
The mode for determining the SOH of the power battery may also be: determining that the power battery enters a charging mode, and judging whether the SOC value before the charging is accurate, wherein judgement criterion can be whether an OCV (open circuit voltage) correction is performed, and when it is determined that the power battery has not undergone the OCV correction, the charging state is monitored and recorded to a fully charged total capacity value, which is recorded as a charging total capacity value, and according to a charging initial capacity value and the charging total capacity value of the power battery, an actual capacity value of a current battery pack is calculated, a rated capacity of the power battery is acquired, and the current SOH value of the power battery is calculated according to the actual capacity value of the power battery.
In another example, it is determined that the power battery enters the charging mode, and it is judged whether the SOC value before the charging is accurate, wherein the judgment criterion can be based on that cumulative charging and discharging capacity of the power battery after undergoing the OCV correction does not exceed a calibration value, and the cumulative charging and discharging capacity is recorded as a charging initial correction capacity value, the charging state is monitored and recorded to a fully charged

total capacity value, which is recorded as a charging total capacity value, and an actual capacity value of the current battery pack is calculated according to a charging initial correction capacity value and the charging total capacity value, an actual capacity value of the current battery pack is calculated, a rated capacity of the battery is acquired, and the current SOH value is calculated according to the actual capacity value of the battery pack.
Another mode is: statically calculating an SOH value of a battery pack according to ageing data and calendar life data of the power battery, i.e., training an aging life model based on the aging data and the calendar life data, to obtain a trained aging life model, wherein an SOC state of current charging and discharging, a battery temperature value, and a charging and discharging rate factor are considered in the aging life model, and this is taken as gain of an accumulated charging and discharging capacity value. The calendar life model is accumulated in unit of day, wherein when an attenuation value is accumulated to 1%, calculation update is triggered, temperature factor is also considered, and this is taken as gain of attenuation, wherein the attenuation values calculated based on the aging life model and the calendar life model are superposed with each other, to finally obtain the SOH value of the power battery.
Referring to FIG. 10, an embodiment of the present disclosure further provides a state parameter determining device 110 of a power battery applicable to the electronic equipment 100 shown in FIG. 1, wherein the state parameter determining device 110 of a power battery includes:
an acquiring module 111 and a determining module 112,
wherein the acquiring module 111 is configured to acquire a first capacity increment curve and a second capacity increment curve of the power battery, wherein the first capacity increment curve represents a corresponding relationship between the capacity increment and the SOC value under different operating conditions, the second capacity increment curve represents a corresponding relationship between the capacity increment and the SOH value under different operating conditions, and the first capacity increment curve and the second capacity increment curve are constructed from charging data during charging and discharging of the power battery under different operating conditions; and
the determining module 112 is configured to determine a third capacity increment curve and a fourth capacity increment curve of the power battery, wherein the third capacity increment curve represents a corresponding relationship between the capacity increment and the SOC value in the preset period of time, and the fourth capacity increment curve represents a corresponding relationship between the capacity increment and the SOH value in the preset period of time; the SOC value of the power battery is determined based on the first capacity increment curve and the third capacity increment curve, and the SOH value of the power battery is determined based on the second capacity increment curve and the fourth capacity increment curve; and the determining module takes the SOC value and the SOH value as state parameters of the power battery.

The present disclosure further provides electronic equipment 100, wherein the electronic equipment 100 includes a processor 130 and a memory 120. The memory 120 stores a computer executable instruction, and the processor 130, when executes the computer program, implements the method for determining state parameters of a power battery.
An embodiment of the present disclosure further provides a computer readable storage medium, wherein the storage medium stores a computer program, and the computer program, when executed by the processor 130, implements the method for determining state parameters of a power battery.
In the embodiments provided in the present disclosure, it should be understood that, the device and the method disclosed also may be implemented in other modes. The device embodiments described above are merely schematic, for example, the flowcharts and block diagrams in the drawings show the architecture, functionality, and operation possibly implemented by devices, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams may represent a module or part of program segment or code, and the module or part of program segment or code includes one or more executable instructions for implementing specified logical functions. It should also be noted that, in some alternative implementation modes, the functions noted in the blocks may also occur out of the order marked in the drawings. For example, two continuous blocks may, in fact, be concurrently executed substantially, or they may sometimes be also executed in a reverse order, which depends upon the functionality involved. It also should be noted that each block of the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, may be implemented in dedicated hardware-based systems that perform the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.
Besides, various functional modules in various embodiments of the present disclosure can be integrated together to form one independent portion, and it is also possible that various modules exist independently, or that two or more modules are integrated to form an independent part. If the function is realized in a form of software functional module and is sold or used as an individual product, it may be stored in one computer readable storage medium. Based on such understanding, the technical solution of the present disclosure essentially or the part making contribution to the prior art or part of this technical solution can be embodied in a form of software product, and this computer software product is stored in one storage medium, including several instructions used to make one computer device (which can be a personal computer, a sever or a network device etc.) execute all or some of the steps of the methods of various embodiments of the present disclosure. The aforementioned storage medium includes various media in which program codes can be stored, such as U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), diskette and compact disk.
It should be indicated that in the present text, relational terms such as first and second are merely for distinguishing one entity or operation from another

entity or operation, while it is not required or implied that these entities or operations necessarily have any such practical relation or order. Moreover, terms “including”, “containing” or any other variations thereof are intended to be non-exclusive, thus a process, method, article or device including a series of elements not only include those elements, but also include other elements that are not listed definitely, or further include elements inherent to such process, method, article or device. Without more restrictions, an element defined with wording “including a...” does not exclude presence of other same elements in the process, method, article or device including said element.
The above-mentioned are merely various embodiments of the present disclosure, however, the scope of protection of the present disclosure is not limited thereto, and within the technical scope disclosed in the present disclosure, any modifications or substitutions easily conceived by any skilled person familiar with the art should fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

WE CLAIM:
1. A method for determining state parameters of a power battery,
comprising steps of:
acquiring a first capacity increment curve and a second capacity increment curve of the power battery, wherein the first capacity increment curve represents a corresponding relationship between a capacity increment and an SOC value under different operating conditions, the second capacity increment curve represents a corresponding relationship between the capacity increment and an SOH value under different operating conditions, and the first capacity increment curve and the second capacity increment curve are constructed from charging data during charging and discharging of the power battery under different operating conditions;
determining a third capacity increment curve and a fourth capacity increment curve of the power battery, wherein the third capacity increment curve represents a corresponding relationship between the capacity increment and the SOC value in a preset period of time, and the fourth capacity increment curve represents a corresponding relationship between the capacity increment and the SOH value in the preset period of time; and
determining the SOC value of the power battery based on the first capacity increment curve and the third capacity increment curve, and determining the SOH value of the power battery based on the second capacity increment curve and the fourth capacity increment curve,
wherein the SOC value and the SOH value are taken as the state parameters of the power battery.
2. The method according to claim 1, wherein the step of determining the
SOC value of the power battery based on the first capacity increment
curve and the third capacity increment curve comprises:
acquiring a first inflection point in the third capacity increment curve;
determining an operating condition parameter corresponding to the first inflection point;
acquiring a plurality of second inflection points in the first capacity increment curve;
determining, from each of the second inflection points, a target inflection point matched with the operating condition parameter of the first inflection point; and
determining a first SOC value corresponding to the target inflection point,
wherein the first SOC value corresponding to the target inflection point is taken as the SOC value of the power battery.
3. The method according to claim 2, wherein the method further comprises:

determining, based on the third capacity increment curve, a second SOC value corresponding to the first inflection point;
calculating a first difference between the second SOC value and the first SOC value; and
correcting, when the first difference is greater than or equal to a first preset threshold, the second SOC value to the first SOC value.
4. The method according to claim 3, wherein the method further comprises:
outputting and displaying the second SOC value as a display SOC;
determining a charging and discharging interval to which the second SOC value belongs;
determining a rate value of the first difference; and
compensating for the charging and discharging interval of the display SOC based on the rate value, so that the display SOC approximates to the first SOC value until the display SOC is consistent with the first SOC value.
5. The method according to claim 1, wherein the method further comprises
steps of:
determining a current temperature of the power battery;
determining, based on the SOC value and the current temperature of the power battery, a current charging and discharging power of the power battery from a charging and discharging power MAP table;
judging, based on the current charging and discharging power, whether the current charging and discharging power needs to be switched; and
if Yes, switching the current charging and discharging power to a target charging and discharging power, wherein when the current charging and discharging power is a peak value, the target charging and discharging power is a continuous value, and when the current charging and discharging power is a continuous value, the target charging and discharging power is a peak value.
6. The method according to claim 5, wherein the step of judging based on
the current charging and discharging power whether the current charging
and discharging power needs to be switched comprises:
acquiring, from the charging and discharging power MAP table, a running time corresponding to the current charging and discharging power;
calculating a first power value in which the current charging and discharging power is run for the running time;
calculating, in real time, a second power value of the power battery at a current moment T based on the current charging and discharging power;

calculating a third power value of the power battery at a second moment Tn based on the current charging and discharging power;
calculating a second difference between the third power value and the second power value; and
determining that the current charging and discharging power needs to be switched when the second difference is greater than the first power value.
7. The method according to claim 6, wherein the method further comprises:
acquiring a voltage of the power battery in real time; and
determining that the current charging and discharging power needs to be switched when the voltage is less than or equal to the second preset threshold.
8. The method according to claim 1, wherein the step of determining the
SOH value of the power battery based on the second capacity increment
curve and the fourth capacity increment curve comprises:
determining, from the fourth capacity increment curve, a first capacity increment of the power battery, wherein the first capacity increment is a height value of a characteristic peak in the fourth capacity increment curve;
determining each second capacity increment in the second capacity increment curve, wherein the second capacity increment is a height value of a characteristic peak in the second capacity increment curve;
determining, from each of the second capacity increments, a target capacity increment matched with the first capacity increment;
determining a rated capacity of the power battery; and
calculating, based on the target capacity increment and the rated capacity, the SOH value of the power battery.
9. The method according to claim 8, wherein when a plurality of the first
capacity increments are contained, the step of determining, from each of
the second capacity increments, a target capacity increment matched
with the first capacity increment comprises:
determining, from each of the second capacity increments, each target capacity increment matched with each of the first capacity increments; and
the step of calculating based on the target capacity increment and the rated capacity the SOH value of the power battery comprises:
determining a weight value corresponding to each of the target capacity increments respectively;

calculating respective product of each of the target capacity increments and corresponding weight value;
calculating a sum of the respective product; and
calculating a ratio of the sum to the rated capacity as the SOH value of the power battery.
10. Electronic equipment, comprising a memory and a processor, wherein the memory stores a computer program, and the processor, when executes the computer program, implements the steps of the method according to any one of claims 1-9.