CN115064795B - Battery power state switching method and device and electronic equipment - Google Patents
Battery power state switching method and device and electronic equipment Download PDFInfo
- Publication number
- CN115064795B CN115064795B CN202210752353.1A CN202210752353A CN115064795B CN 115064795 B CN115064795 B CN 115064795B CN 202210752353 A CN202210752353 A CN 202210752353A CN 115064795 B CN115064795 B CN 115064795B
- Authority
- CN
- China
- Prior art keywords
- power
- battery
- time
- switching
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a battery power state switching method, a device and electronic equipment, wherein the method comprises the following steps: obtaining output power, continuous power and peak power of a battery; calculating a first time integral value of a portion of the output power exceeding the continuous power from the current time; when the first time integral value reaches a preset threshold value, switching the current power upper limit from peak power to continuous power, wherein the current power upper limit is used for representing the highest power value which can be reached by the output power of the battery, and the preset threshold value is generated based on the lithium ion concentration mapping of the SEI film of the battery. The technical scheme provided by the invention can improve the power state switching accuracy of the battery.
Description
Technical Field
The present invention relates to the field of power batteries, and in particular, to a method and an apparatus for switching a power state of a battery, and an electronic device.
Background
With the high-speed development of the new energy field, the lithium battery is used as an indispensable power storage device in the fields of new energy electric automobiles and the like, and the high-speed development is correspondingly obtained. An accurate and reliable Battery management system (Battery MANAGEMENT SYSTEM, BMS) is taken as the basis of the utilization of the maximized capacity and the safety guarantee of the lithium Battery, and is the main research direction for improving the research of the Battery performance at present. The Power State of Power (SOP) of the battery is taken as one of key parameters of the BMS, is an indispensable part of the Power economy performance of the whole vehicle, and related algorithms and strategies of the SOP directly influence whether the battery capacity can be completely released and whether the battery safety can be ensured.
Currently, when battery parameters are given, a battery provider will give a plurality Of power maps, and different power maps are marked with different time labels, for example, 5s, 10s, 60s and 120s, and each power map includes a State Of Charge (SOC) and a power value under a temperature condition. For example, the time tag of a certain power map is 5s, and the power is retrieved from the power map according to the corresponding SOC of the current battery and the current ambient temperature to be used for representing that the power can be continuously discharged for not more than 5s under the current SOC and the current temperature, and the service life of the battery can be influenced if the power exceeds 5 s. Generally, a battery enterprise takes a given power value with shorter duration such as 5s or 10s as the peak power of a battery; the power value of 60s or longer is used as the continuous power, and the power which can be used continuously for a long time and has less influence on the service life of the battery is characterized. The SOP algorithm is to switch between peak power and continuous power according to the power map in order to protect the battery and improve the comfort of the user using the electric equipment, so as to change the limit range of the output power. The current mainstream practice is that the service time and switching frequency of peak power are manually calibrated through multiple tests by using the power map of the peak power and the continuous power, but the switching method is low in accuracy and is difficult to ensure the safety of the battery.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method and a device for switching power states of a battery and electronic equipment, so that the accuracy of switching power states of the battery is improved.
According to a first aspect, an embodiment of the present invention provides a method for switching a power state of a battery, the method including: obtaining output power, continuous power and peak power of a battery; calculating a first time integral value of a portion of the output power exceeding the continuous power from a current time; when the first time integral value reaches a preset threshold value, switching the current power upper limit from the peak power to the continuous power, wherein the current power upper limit is used for representing the highest power value which can be reached by the output power of the battery, and the preset threshold value is generated based on lithium ion concentration mapping of the SEI film of the battery.
Optionally, the step of generating the preset threshold by mapping includes: obtaining sample output power, sample continuous power and sample peak power of a battery sample; calculating a second time integral value of a part of the sample output power exceeding the sample continuous power from the current moment, and respectively recording the second time integral value at each moment and the lithium ion concentration of SEI film accumulation in the battery sample; when the lithium ion concentration reaches the lithium ion concentration of the battery sample, obtaining a second time integral value corresponding to the moment; and determining the preset threshold value based on a second time integral value corresponding to the moment.
Optionally, the determining the preset threshold based on the second time integral value corresponding to the moment includes: and reducing the second time integral value corresponding to the moment, and taking the reduced result as the preset threshold value.
Optionally, the switching the current upper power limit from the peak power to the continuous power includes: acquiring the variation trend of the output voltage of the battery; if the output voltage change trend is a descending trend, switching the current upper power limit from the peak power to the continuous power based on a first switching speed; if the output voltage variation trend is an ascending trend, switching the current upper power limit from the peak power to the continuous power based on a second switching speed; wherein the first switching speed is higher than the second switching speed.
Optionally, the first switching speed is equal to the difference between the peak power and the sustained power, and then the ratio of the peak power to the variation time; the second switching speed is equal to the difference between the output power and the continuous power, and then the ratio of the second switching speed to the change time; wherein the change time is a time length during which the first time integrated value reaches the preset threshold value from the current time.
Optionally, the acquiring the output voltage variation trend of the battery includes: collecting output voltage in a preset period, and calculating the difference value of two adjacent voltage sampling values to obtain a plurality of voltage difference values; fitting an output voltage change curve based on the voltage difference values, and calculating predicted values of a plurality of voltage difference values in the future based on the output voltage change curve; and calculating the average value of the predicted values of the future voltage differences, and determining the output voltage change trend according to the magnitude relation between the average value and zero.
Optionally, the method further comprises: calculating a third time integrated value of a portion of the output power lower than the continuous power from a time point at which the current upper power limit is switched from the peak power to the continuous power; and when the third time integral value is equal to a first time integral value corresponding to the moment of switching from the peak power to the continuous power, switching the current upper power limit from the continuous power to the peak power.
According to a second aspect, an embodiment of the present invention provides a power state switching device of a battery, the device including: the data acquisition unit is used for acquiring the output power, the continuous power and the peak power of the battery; a calculation unit configured to calculate a first time-integrated value of a portion of the output power exceeding the continuous power from a current time; and the switching unit is used for switching the current power upper limit from the peak power to the continuous power when the first time integral value reaches a preset threshold value, wherein the current power upper limit is used for representing the highest power value which can be reached by the output power of the battery, and the preset threshold value is generated based on the lithium ion concentration mapping of the SEI film of the battery.
According to a third aspect, an embodiment of the present invention provides an electronic device, including: the system comprises a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, thereby executing the method in the first aspect or any optional implementation manner of the first aspect.
According to a fourth aspect, embodiments of the present invention provide a computer readable storage medium storing computer instructions for causing the computer to perform the method of the first aspect, or any one of the alternative embodiments of the first aspect.
The technical scheme provided by the application has the following advantages:
According to the technical scheme provided by the application, the factors of potential safety hazards in the battery are started, when the output power of the battery is larger than the continuous power in the discharging process of the lithium ion battery, the lithium ion accumulation speed on the surface of an SEI (Solid Electrolyte Interface solid electrolyte interface) film in the lithium ion battery is larger than the lithium ion absorption speed of a carbon film, namely the positive lithium ion accumulation speed is larger than the negative lithium ion absorption speed, so that the concentration of the positive lithium ion of the battery is increased, the voltage of the battery is reduced, and the maximum power cannot be maintained. Therefore, in the embodiment, a first time integral value of the part of the output power exceeding the continuous power with respect to time is calculated in real time, and a mapping relation is made between the first time integral value and the lithium ion concentration, so that a preset threshold value is created based on the corresponding lithium ion concentration when the lithium precipitation phenomenon occurs in the battery, the lithium ion concentration of the positive electrode of the battery is represented based on a comparison relation between the first time integral value and the preset threshold value, when the first time integral value reaches the preset threshold value, the positive electrode lithium ion concentration is represented to be too high, the output power of the battery is required to be limited, and therefore the current upper limit of the power is switched from peak power to continuous power, so that the original output power of the battery cannot exceed the peak power to the output power which cannot exceed the continuous power, the use safety of the battery is ensured, and the accuracy of the battery power state switching time is remarkably improved.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 is a schematic diagram showing steps of a method for switching power states of a battery according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for switching power states of a battery according to an embodiment of the invention;
fig. 3 is a schematic diagram showing a structure of a power state switching device of a battery according to an embodiment of the present invention;
Fig. 4 shows a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the invention.
Referring to fig. 1 and 2, in one embodiment, a method for switching power states of a battery specifically includes the following steps:
Step S101: the output power, the continuous power and the peak power of the battery are obtained.
Step S102: a first time integral value of a portion of the output power exceeding the continuous power is calculated from the present moment.
Step S103: when the first time integral value reaches a preset threshold value, switching the current power upper limit from peak power to continuous power, wherein the current power upper limit is used for representing the highest power value which can be reached by the output power of the battery, and the preset threshold value is generated based on the lithium ion concentration mapping of the SEI film of the battery.
Specifically, the embodiment of the invention starts from the factor of potential safety hazard of the battery, thereby improving the accuracy of the switching time of the power state of the battery based on the reaction mechanism of the lithium ion battery. Firstly, peak power and continuous power are obtained through table look-up under the current environmental conditions (including but not limited to temperature, SOC and SOH), then the output power of the battery is monitored in real time in the discharging process of the lithium ion battery, when the output power of the battery is larger than the continuous power, the lithium ion stacking speed of the SEI (Solid Electrolyte Interface solid electrolyte interface) film surface in the lithium ion battery is larger than the lithium ion absorption speed of the carbon film, namely the positive lithium ion stacking speed is larger than the negative lithium ion absorption speed, so that the concentration of the positive lithium ion of the battery is increased, the voltage of the battery is reduced, and the maximum power cannot be maintained. Therefore, if switching of the power state can be performed near the time when lithium precipitation occurs due to an excessively high lithium ion concentration, on the one hand, the safety risk of the battery can be avoided, and on the other hand, the output power of the battery can be kept as high as possible, so that the output force of the battery can be maximized. Based on this, in this embodiment, a first time integral value of a portion of the output power exceeding the continuous power with respect to time (specifically, a portion of the current corresponding to the calculated output power exceeding the current corresponding to the continuous power, and an integral of the second time integral value with respect to time are calculated, and an integral of the exceeding current portion with respect to time is calculated in the same way), and a mapping relationship is made between the first time integral value and the lithium ion concentration, so as to create a preset threshold based on the lithium ion concentration corresponding to the occurrence of the lithium precipitation phenomenon of the battery, and therefore, based on a comparison relationship between the first time integral value and the preset threshold, the lithium ion concentration of the positive electrode is represented, when the first time integral value reaches the preset threshold, the positive electrode lithium ion concentration is represented to be too high, the output power of the battery needs to be limited, so that the current upper power limit is switched from the peak power to the continuous power, the battery cannot exceed the peak power to the output power, the safety of the battery cannot exceed the continuous power, the use is guaranteed, and the accuracy of the battery power state switching time is remarkably improved.
Specifically, in this embodiment, the specific steps for creating the preset threshold are as follows:
1. obtaining a battery sample, and obtaining sample output power, sample continuous power and sample peak power of the battery sample, so as to perform a discharge test of a subsequent battery sample;
2. And starting discharging the battery sample, calculating a second time integral value of a part of the sample output power exceeding the sample continuous power from the current moment, and recording the second time integral value at each moment and the lithium ion concentration of SEI film accumulation in the battery sample respectively. Specifically, based on the second time integrated value recorded at each time and the lithium ion concentration of the positive electrode of the battery sample, a one-to-one correspondence table relationship of the lithium ion concentration and the second time integrated value is created.
3. And when the lithium ion concentration reaches the moment when the lithium ion concentration of the battery sample is separated, acquiring a second time integral value corresponding to the moment.
4. A preset threshold value is determined based on the second time integral value corresponding to the time.
Specifically, when the lithium precipitation phenomenon occurs in the battery sample, according to the table relationship created in the step 2, the table is searched to obtain a second time integral value corresponding to the current positive lithium ion concentration. And then, according to the step4, the second time integral value corresponding to the current positive lithium ion concentration can be directly used as a preset threshold value, or other processing can be carried out on the second time integral value so as to obtain an accurate preset threshold value. And then in an actual application scene, when the first time integral value of the battery reaches a preset threshold value, switching the upper power limit of the battery, thereby improving the accuracy of the switching time of the power state of the battery.
Specifically, in the present embodiment, the second time integrated value corresponding to the time is also reduced, and the reduced result is taken as a preset threshold value.
Specifically, although the second time integral value corresponding to the occurrence of the lithium precipitation phenomenon of the battery sample is directly used as the preset threshold value, the best switching time is the best switching time under the condition that the maximum output force of the battery is maintained. However, in a practical application scenario, there is an extreme case: the output power of the battery is continuously close to the peak power, and the difference value is larger than the continuous power, so that the increase of the concentration of the positive lithium ions is quick, and the process of switching the upper power limit of the battery from the peak power to the continuous power is not instant switching, but a period of time is needed, so that the concentration of the positive lithium ions exceeds the concentration of the lithium ions corresponding to the lithium precipitation phenomenon if the output power of the battery is higher for a long time in the process. Therefore, in this embodiment, in order to further improve the safety of the battery, the second time integral value corresponding to the lithium ion concentration when the lithium ion precipitation occurs in the battery is reduced (the reduction multiple of this embodiment is 0.5 times, which is merely by way of example and not by way of limitation), and the reduced result is taken as a preset threshold value, so that when the first time integral value of the battery reaches the preset threshold value, the lithium ion concentration of the positive electrode of the battery does not reach the concentration corresponding to the lithium ion precipitation phenomenon yet, and thus the switching of the power state is started in advance, and a buffer time exists for an application scenario with a larger battery output power, so as to further improve the safety of the switching of the power state of the battery.
Specifically, in one embodiment, the step S103 specifically includes the following steps:
step one: and acquiring the change trend of the output voltage of the battery.
Step two: and if the output voltage variation trend is in a descending trend, switching the current upper power limit from the peak power to the continuous power based on the first switching speed.
Step three: if the output voltage variation trend is an ascending trend, switching the current upper power limit from peak power to continuous power based on the second switching speed; wherein the first switching speed is higher than the second switching speed.
Specifically, in this embodiment, two switching speeds, that is, a first switching speed and a second switching speed, are preset for the process of switching the current upper power limit of the battery from the peak power to the continuous power, where the first switching speed is faster and the second switching speed is slower. Aiming at the variation trend of the battery output voltage, the upper power limit is switched at different speeds so as to adapt to different application scenes, and the accuracy of battery power state switching is further improved. First, the output voltage of the battery=the open circuit voltage OCV (constant value) of the battery) -the output current of the battery is the internal resistance of the battery, so, according to the analysis of the trend of variation of the output voltage of the battery, if the output voltage of the battery shows an ascending trend in the future, the output current of the battery is the internal resistance of the battery shows a descending trend, so the output power of the battery is already in a descending state, so that in order to ensure the maximum discharge output of the battery, the current upper limit power of the battery does not need to be quickly reduced, and therefore, the present embodiment uses the slower second switching speed to switch the current upper limit power from the peak power to the continuous power. If the output voltage of the battery shows a decreasing trend in the future, the output current of the battery shows an increasing trend with respect to the internal resistance of the battery, so that the output power of the battery is still in an increasing state, and if the switching speed is too slow, the lithium ion concentration of the positive electrode of the battery is difficult to decrease. Therefore, in order to ensure that the lithium precipitation phenomenon does not occur in the battery, the current upper power limit of the battery needs to be rapidly reduced, so that the current upper power limit is switched from peak power to continuous power by using a faster first switching speed.
Specifically, in the present embodiment, the specific calculation method of the first switching speed and the second switching speed is as follows:
first switching speed= (peak power-continuous power)/change time;
Second switching speed= (output power-continuous power)/change time;
Wherein the change time is a time length of the first time integration value reaching a preset threshold value from the current time. In one embodiment, the first time integral of the change time in the first switching speed expression is calculated in terms of peak power current and the first time integral of the change time in the second switching speed expression is calculated in terms of output power current. Specifically, through experimental verification, the first switching speed and the second switching speed are switched based on the power state determined by the embodiment, and the method has the advantage of being more accurate for the scenes of different trends of the battery output voltage.
Specifically, in one embodiment, the first step specifically includes the following steps:
step four: and collecting output voltage in a preset period, and calculating the difference value of the voltage sampling values of two adjacent times to obtain a plurality of voltage difference values.
Step five: and fitting an output voltage change curve based on the plurality of voltage difference values, and calculating predicted values of a plurality of voltage difference values in the future based on the output voltage change curve.
Step six: and calculating the average value of the predicted values of a plurality of voltage difference values in the future, and determining the change trend of the output voltage through the magnitude relation between the average value and zero.
Specifically, in order to further improve the trend accuracy of predicting the future output voltage of the battery, and the process of trend prediction can be quantified. The algorithm of the embodiment firstly collects the output voltage of the battery in a preset period (for example, the sampling time length is 100ms, 300ms, 500ms and the like), and then performs differential pressure calculation on the sampling value to obtain a plurality of voltage difference values (for example, 10 times of voltage difference values are calculated). And then, fitting a change curve (namely an output voltage change curve) of the voltage difference value by using the voltage difference value through a least square method, and obtaining predicted values of the voltage difference value for a plurality of times in the future, such as the voltage difference value for the subsequent 5 times by using the change curve. And finally, calculating the average value of the 5-time voltage difference values, if the average value is larger than 0, considering that the future output voltage presents an ascending trend, and if the average value is smaller than 0, considering that the future output voltage presents a descending trend.
Specifically, in an embodiment, the method for switching the power state of the battery provided by the embodiment of the invention further includes the following steps:
step seven: calculating a third time integral value of a portion of the output power lower than the continuous power from the time when the current upper power limit is switched from the peak power to the continuous power;
Step eight: and when the third time integral value is equal to the first time integral value corresponding to the moment of switching from the peak power to the continuous power, switching the current upper power limit from the continuous power to the peak power.
Specifically, after the current upper power limit is switched from the peak power to the continuous power, the output power of the battery cannot exceed the continuous power, so that the increasing speed of lithium ions of the positive electrode of the battery is smaller than the absorbing speed of lithium ions of the negative electrode of the battery, and the concentration of lithium ions of the positive electrode of the battery starts to decrease. And calculating a third time integral value of a part of the output power lower than the continuous power from the switching moment, so that the amount of lithium ion concentration reduction of the positive electrode of the battery can be represented according to the mapping relation, and when the third time integral value is equal to a first time integral value corresponding to the moment of switching from the peak power to the continuous power, in other words, the first time integral value in the last power state switching is counteracted by the third time integral value with the same size, so that the first time integral value is smaller than or equal to zero, the lithium ion accumulation of the positive electrode of the battery is represented to be completely consumed, a power recovery flow can be started, the current upper power limit is recovered from the continuous power to the peak power, the output of the battery is improved, and the electricity utilization experience of a user is improved.
Through the steps, the technical scheme starts from the factor that potential safety hazards appear in the battery, and in the discharging process of the lithium ion battery, when the output power of the battery is larger than the continuous power, the lithium ion accumulation speed on the surface of an SEI (Solid Electrolyte Interface solid electrolyte interface) film in the lithium ion battery is larger than the speed of absorbing lithium ions by a carbon film, namely the positive lithium ion accumulation speed is larger than the negative lithium ion absorption speed, so that the concentration of the positive lithium ions of the battery is increased, the voltage of the battery is reduced, and the maximum power cannot be maintained. Therefore, in the embodiment, a first time integral value of the part of the output power exceeding the continuous power with respect to time is calculated in real time, and a mapping relation is made between the first time integral value and the lithium ion concentration, so that a preset threshold value is created based on the corresponding lithium ion concentration when the lithium precipitation phenomenon occurs in the battery, the lithium ion concentration of the positive electrode of the battery is represented based on a comparison relation between the first time integral value and the preset threshold value, when the first time integral value reaches the preset threshold value, the positive electrode lithium ion concentration is represented to be too high, the output power of the battery is required to be limited, and therefore the current upper limit of the power is switched from peak power to continuous power, so that the original output power of the battery cannot exceed the peak power to the output power which cannot exceed the continuous power, the use safety of the battery is ensured, and the accuracy of the battery power state switching time is remarkably improved.
As shown in fig. 3, the present embodiment further provides a power state switching device of a battery, including:
The data acquisition unit 101 is configured to acquire output power, continuous power and peak power of the battery. For details, refer to the related description of step S101 in the above method embodiment, and no further description is given here.
A calculation unit 102 for calculating a first time integral value of a portion of the output power exceeding the continuous power from the current time. For details, refer to the related description of step S102 in the above method embodiment, and no further description is given here.
And a switching unit 103, configured to switch the current power upper limit from the peak power to the continuous power when the first time integration value reaches a preset threshold, where the current power upper limit is used to represent a highest power value that can be reached by the output power of the battery, and the preset threshold is generated based on the lithium ion concentration mapping of the SEI film of the battery. For details, see the description of step S103 in the above method embodiment, and the details are not repeated here.
The power state switching device of the battery provided by the embodiment of the present invention is used for executing the power state switching method of the battery provided by the above embodiment, and its implementation manner is the same as the principle, and details are referred to the related description of the above method embodiment and are not repeated.
Through the cooperation of the components, the technical scheme starts from the factor that potential safety hazard occurs in the battery, and in the discharging process of the lithium ion battery, when the output power of the battery is larger than the continuous power, the lithium ion accumulation speed of the SEI (Solid Electrolyte Interface solid electrolyte interface) film surface in the lithium ion battery is larger than the lithium ion absorption speed of the carbon film, namely the positive lithium ion accumulation speed is larger than the negative lithium ion absorption speed, so that the concentration of the positive lithium ion of the battery is increased, the voltage of the battery is reduced, and the maximum power cannot be maintained. Therefore, in the embodiment, a first time integral value of the part of the output power exceeding the continuous power with respect to time is calculated in real time, and a mapping relation is made between the first time integral value and the lithium ion concentration, so that a preset threshold value is created based on the corresponding lithium ion concentration when the lithium precipitation phenomenon occurs in the battery, the lithium ion concentration of the positive electrode of the battery is represented based on a comparison relation between the first time integral value and the preset threshold value, when the first time integral value reaches the preset threshold value, the positive electrode lithium ion concentration is represented to be too high, the output power of the battery is required to be limited, and therefore the current upper limit of the power is switched from peak power to continuous power, so that the original output power of the battery cannot exceed the peak power to the output power which cannot exceed the continuous power, the use safety of the battery is ensured, and the accuracy of the battery power state switching time is remarkably improved.
Fig. 4 shows an electronic device according to an embodiment of the invention, comprising a processor 901 and a memory 902, which may be connected via a bus or otherwise, in fig. 4 by way of example.
The processor 901 may be a central processing unit (Central Processing Unit, CPU). The Processor 901 may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSPs), application SPECIFIC INTEGRATED Circuits (ASICs), field-Programmable gate arrays (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 902 is used as a non-transitory computer readable storage medium for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the methods in the method embodiments described above. The processor 901 executes various functional applications of the processor and data processing, i.e., implements the methods in the above-described method embodiments, by running non-transitory software programs, instructions, and modules stored in the memory 902.
The memory 902 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created by the processor 901, and the like. In addition, the memory 902 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 902 optionally includes memory remotely located relative to processor 901, which may be connected to processor 901 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 902 that, when executed by the processor 901, perform the methods of the method embodiments described above.
The specific details of the electronic device may be correspondingly understood by referring to the corresponding related descriptions and effects in the above method embodiments, which are not repeated herein.
It will be appreciated by those skilled in the art that implementing all or part of the above-described methods in the embodiments may be implemented by a computer program for instructing relevant hardware, and the implemented program may be stored in a computer readable storage medium, and the program may include the steps of the embodiments of the above-described methods when executed. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a hard disk (HARD DISK DRIVE, abbreviated as HDD), a Solid state disk (Solid-STATE DRIVE, SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (9)
1. A method for switching power states of a battery, the method comprising:
obtaining output power, continuous power and peak power of a battery;
calculating a first time integral value of a portion of the output power exceeding the continuous power from a current time;
When the first time integral value reaches a preset threshold value, switching the current power upper limit from the peak power to the continuous power, wherein the current power upper limit is used for representing the highest power value which can be reached by the output power of the battery, and the preset threshold value is generated based on the lithium ion concentration mapping of the SEI film of the battery;
The step of mapping to generate the preset threshold value comprises the following steps: obtaining sample output power, sample continuous power and sample peak power of a battery sample; calculating a second time integral value of a part of the sample output power exceeding the sample continuous power from the current moment, and respectively recording the second time integral value at each moment and the lithium ion concentration of SEI film accumulation in the battery sample; when the lithium ion concentration reaches the lithium ion concentration of the battery sample, obtaining a second time integral value corresponding to the moment; and determining the preset threshold value based on a second time integral value corresponding to the moment.
2. The method according to claim 1, wherein the determining the preset threshold value based on the second time integral value corresponding to the time instant includes:
and reducing the second time integral value corresponding to the moment, and taking the reduced result as the preset threshold value.
3. The method of claim 1, wherein said switching the current upper power limit from the peak power to the sustained power comprises:
Acquiring the variation trend of the output voltage of the battery;
if the output voltage change trend is a descending trend, switching the current upper power limit from the peak power to the continuous power based on a first switching speed;
if the output voltage variation trend is an ascending trend, switching the current upper power limit from the peak power to the continuous power based on a second switching speed;
Wherein the first switching speed is higher than the second switching speed.
4. A method according to claim 3, wherein the first switching speed is equal to the difference between the peak power and the sustained power, and then the ratio of the change time; the second switching speed is equal to the difference between the output power and the continuous power, and then the ratio of the second switching speed to the change time; wherein the change time is a time length during which the first time integrated value reaches the preset threshold value from the current time.
5. The method of claim 3, wherein the acquiring the trend of the output voltage of the battery comprises:
collecting output voltage in a preset period, and calculating the difference value of two adjacent voltage sampling values to obtain a plurality of voltage difference values;
fitting an output voltage change curve based on the voltage difference values, and calculating predicted values of a plurality of voltage difference values in the future based on the output voltage change curve;
And calculating the average value of the predicted values of the future voltage differences, and determining the output voltage change trend according to the magnitude relation between the average value and zero.
6. The method according to claim 1, wherein the method further comprises:
Calculating a third time integrated value of a portion of the output power lower than the continuous power from a time point at which the current upper power limit is switched from the peak power to the continuous power;
And when the third time integral value is equal to a first time integral value corresponding to the moment of switching from the peak power to the continuous power, switching the current upper power limit from the continuous power to the peak power.
7. A power state switching device of a battery, the device comprising:
the data acquisition unit is used for acquiring the output power, the continuous power and the peak power of the battery;
A calculation unit configured to calculate a first time-integrated value of a portion of the output power exceeding the continuous power from a current time;
The switching unit is used for switching the current power upper limit from the peak power to the continuous power when the first time integral value reaches a preset threshold value, wherein the current power upper limit is used for representing the highest power value which can be reached by the output power of the battery, and the preset threshold value is generated based on the lithium ion concentration mapping of the SEI film of the battery; the step of mapping to generate the preset threshold value comprises the following steps: obtaining sample output power, sample continuous power and sample peak power of a battery sample; calculating a second time integral value of a part of the sample output power exceeding the sample continuous power from the current moment, and respectively recording the second time integral value at each moment and the lithium ion concentration of SEI film accumulation in the battery sample; when the lithium ion concentration reaches the lithium ion concentration of the battery sample, obtaining a second time integral value corresponding to the moment; and determining the preset threshold value based on a second time integral value corresponding to the moment.
8. An electronic device, comprising:
A memory and a processor in communication with each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of any of claims 1-6.
9. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, the computer instructions for causing the computer to perform the method of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210752353.1A CN115064795B (en) | 2022-06-28 | 2022-06-28 | Battery power state switching method and device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210752353.1A CN115064795B (en) | 2022-06-28 | 2022-06-28 | Battery power state switching method and device and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115064795A CN115064795A (en) | 2022-09-16 |
| CN115064795B true CN115064795B (en) | 2024-09-13 |
Family
ID=83204137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210752353.1A Active CN115064795B (en) | 2022-06-28 | 2022-06-28 | Battery power state switching method and device and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115064795B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109284563A (en) * | 2018-09-30 | 2019-01-29 | 桑顿新能源科技有限公司 | It is a kind of about peak value and continuous power switching BMS to battery system SOP evaluation method |
| CN113109716A (en) * | 2021-04-06 | 2021-07-13 | 江苏大学 | An Electrochemical Model-Based Method for Estimating SOP for Lithium Batteries |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4802945B2 (en) * | 2006-08-31 | 2011-10-26 | トヨタ自動車株式会社 | Secondary battery control system and hybrid vehicle equipped with the same |
| JP5230181B2 (en) * | 2007-12-07 | 2013-07-10 | パナソニック株式会社 | Energy transfer device and semiconductor device for energy transfer control |
| DE102017206694A1 (en) * | 2017-04-20 | 2018-10-25 | Bayerische Motoren Werke Aktiengesellschaft | Method for assisting a driving maneuver and assistance system for a driving maneuver |
| CN113779794B (en) * | 2021-09-13 | 2023-12-01 | 山东大学 | Lithium-ion battery SOP estimation method and system taking into account microscopic constraints |
-
2022
- 2022-06-28 CN CN202210752353.1A patent/CN115064795B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109284563A (en) * | 2018-09-30 | 2019-01-29 | 桑顿新能源科技有限公司 | It is a kind of about peak value and continuous power switching BMS to battery system SOP evaluation method |
| CN113109716A (en) * | 2021-04-06 | 2021-07-13 | 江苏大学 | An Electrochemical Model-Based Method for Estimating SOP for Lithium Batteries |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115064795A (en) | 2022-09-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112572233B (en) | Battery management method and device and vehicle | |
| EP4019321A1 (en) | Battery managing method and device, and vehicle | |
| CN110462414B (en) | Apparatus and method for estimating battery resistance | |
| CN109596983B (en) | A prediction method for capacity diving during battery aging | |
| CN105676138B (en) | Method and system for predicting remaining capacity of battery | |
| US10011185B2 (en) | Method for battery management and battery management system | |
| CN111890988B (en) | Battery thermal runaway detection method and device, battery management system and vehicle | |
| Jin et al. | Comparison of Li-ion battery degradation models for system design and control algorithm development | |
| CN110799849A (en) | Apparatus and method for analyzing SOH | |
| CN111208432A (en) | Method and device for real-time identification of parameters of second-order RC equivalent circuit model for batteries | |
| JP2019049412A (en) | Battery pack state estimation device | |
| KR20210014000A (en) | Method of Predicting Battery Performance by Mathematical Modeling and Simulation | |
| CN116826933A (en) | Knowledge-graph-based hybrid energy storage battery power supply backstepping control method and system | |
| CN117791812A (en) | Active equalization control method and system for charging and discharging of sodium battery pack | |
| CN114252792A (en) | Method and device for detecting internal short circuit of battery pack, electronic equipment and storage medium | |
| CN114089204B (en) | Battery capacity diving inflection point prediction method and device | |
| CN115064795B (en) | Battery power state switching method and device and electronic equipment | |
| CN113484783B (en) | Battery SOH detection method, device, system, medium and program product | |
| CN114355200A (en) | Method and device for establishing battery allowable current model and battery management system | |
| CN113884893A (en) | Power map switching method and device for power battery and electronic equipment | |
| CN104584304B (en) | Application method for electric energy accumulator, the device for performing this application method, battery and the motor vehicle with this battery | |
| JP2023540411A (en) | Charging policy setting method and device | |
| CN114264961B (en) | Method and device for detecting short circuit in battery cell and electronic equipment | |
| CN114184969B (en) | Method and device for testing reversible self-discharge capacity loss of battery cell | |
| EP4254597A1 (en) | Charging method for power battery and battery management system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |