CN115542174A

CN115542174A - Lithium battery SOC correction method and device, energy storage system and storage medium

Info

Publication number: CN115542174A
Application number: CN202211160803.4A
Authority: CN
Inventors: 王小攀; 刘楚柱; 沈高松; 孙中伟
Original assignee: Shenzhen Hello Tech Energy Co Ltd
Current assignee: Shenzhen Hello Tech Energy Co Ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2022-12-30

Abstract

The invention discloses a lithium battery SOC correction method and device, an energy storage system and a storage medium. The lithium battery SOC correction method comprises the following steps: when the current working state of the battery is a discharging state, acquiring the current battery cell monomer voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state of the current battery; when the current battery cell single voltage is less than or equal to a battery cell single voltage threshold value, determining a first SOC value of the current battery according to the current battery cell single voltage, the current discharging current and a cell temperature when the current battery starts to be in a discharging state; and calculating to obtain a second SOC value of the current battery by an ampere-hour integration method, and correcting the SOC of the current battery according to the first SOC value and the second SOC value. The method and the device realize the calculation accuracy of the SOC of the lithium battery.

Description

Lithium battery SOC correction method and device, energy storage system and storage medium

Technical Field

The invention relates to the technical field of battery management, in particular to a lithium battery SOC correction method, a lithium battery SOC correction device, an energy storage system and a storage medium.

Background

The portable energy storage system is a safe, portable, stable and environment-friendly small energy storage system, and can provide a portable movable green energy solution when being far away from the indoor environment. The SOC of a battery in a lithium battery energy storage system cannot be directly measured, and the SOC can be estimated only through parameters such as battery terminal voltage, charging and discharging current, internal resistance and the like, and the parameters are influenced by various uncertain factors such as battery aging, environmental temperature change and the like.

At present, the calculation of charge and discharge SOC is carried out to current portable energy storage system who carries on lithium iron phosphate battery using invariable battery capacity, and it is inaccurate to lead to battery SOC to appear in the charge and discharge when ambient temperature switches over, and simultaneously, the battery SOC of current portable energy storage system who carries on lithium iron phosphate battery revises the effect less than ideal, and in addition, current portable energy storage system who carries on lithium iron phosphate battery does not consider the lithium cell when being in dormant state or state of stewing, the loss of corresponding dormancy battery SOC and the loss of battery SOC that stews.

Disclosure of Invention

The invention provides a lithium battery SOC correction method, a lithium battery SOC correction device, an energy storage system and a storage medium, and aims to solve the problems that the lithium battery SOC calculation is inaccurate and the correction effect on the lithium battery SOC is poor.

According to an aspect of the present invention, there is provided a lithium battery SOC correction method, including:

judging the working state of the current battery, and if the working state of the current battery is a discharging state, acquiring the current battery cell monomer voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state of the current battery;

when the current battery cell single voltage is less than or equal to a battery cell single voltage threshold, determining a first SOC value of the current battery according to the current battery cell single voltage, the current discharge current and a cell temperature when the current battery starts to be in a discharge state;

and calculating to obtain a second SOC value of the current battery by an ampere-hour integration method, and correcting the SOC of the current battery according to the first SOC value and the second SOC value.

Optionally, before the second SOC value of the current battery is calculated by the ampere-hour integration method, the method further includes:

acquiring the battery rated capacity of the current battery;

the second SOC value of the current battery is obtained through calculation by an ampere-hour integral method, and the calculation comprises the following steps:

and calculating to obtain a second SOC value of the current battery by an ampere-hour integration method based on the rated capacity of the battery.

Optionally, the method for correcting the SOC of the lithium battery further includes:

inquiring a battery maximum charging capacity and temperature corresponding relation table based on the cell temperature when the current battery starts to be in a discharging state to obtain the maximum charging capacity of the current battery;

the second SOC value of the current battery is obtained by calculating through an ampere-hour integration method based on the rated capacity of the battery, and the method comprises the following steps:

and when the working state of the current battery is switched from a discharging state to a charging state, determining a second SOC value of the current battery in the charging state by an ampere-hour integration method according to the maximum charging capacity.

Optionally, the lithium battery SOC correction method further includes:

if the working state of the current battery is a charging state, acquiring the cell temperature when the current battery starts to be in the charging state, and inquiring a battery maximum discharge capacity and temperature corresponding relation table according to the cell temperature when the current battery starts to be in the charging state to obtain the maximum discharge capacity of the current battery;

and when the working state of the current battery is switched from a charging state to a discharging state, determining a second SOC value of the current battery in the discharging state by an ampere-hour integration method according to the maximum discharging capacity.

Optionally, the correcting the current battery SOC according to the first SOC value and the second SOC value includes:

if the first SOC value is smaller than the second SOC value, accelerating the speed of estimating the second SOC value by an ampere-hour integration method so as to control the second SOC value to accelerate the correction of the current battery SOC;

and if the first SOC value is larger than the second SOC value, slowing down the speed of estimating the second SOC value by an ampere-hour integration method so as to control the second SOC value to slow down and correct the current battery SOC.

Optionally, the lithium battery SOC correction method further includes:

if the working state of the current battery is a dormant state, acquiring the dormant time length of the current battery and the dormant quiescent current in the dormant state;

and obtaining the sleep SOC loss of the current battery according to the sleep time length and the sleep quiescent current.

Optionally, the lithium battery SOC correction method further includes:

if the current battery is in a standing state, acquiring the standing time length of the current battery and the standing quiescent current in the standing state;

and obtaining the static SOC loss of the current battery according to the static time length and the static current.

According to another aspect of the present invention, there is provided a lithium battery SOC correction apparatus including:

the information acquisition module is used for judging the working state of the current battery, and acquiring the current battery cell monomer voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state if the working state of the current battery is in the discharging state;

a first SOC value determining module, configured to determine a first SOC value of the current battery according to the current battery cell voltage, the current discharging current, and a cell temperature when the current battery starts to be in a discharging state when the current battery cell voltage is less than or equal to a battery cell voltage threshold;

and the battery SOC correction module is used for calculating to obtain a second SOC value of the current battery through an ampere-hour integration method and correcting the SOC of the current battery according to the first SOC value and the second SOC value.

According to another aspect of the present invention, there is provided an energy storage system including:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the method for correcting SOC of lithium battery according to any embodiment of the present invention.

According to another aspect of the present invention, a computer-readable storage medium is provided, which stores computer instructions for causing a processor to implement the method for correcting SOC of a lithium battery according to any embodiment of the present invention when executed.

According to the technical scheme of the embodiment of the invention, by judging the working state of the current battery, if the working state of the current battery is a discharging state, the single voltage of the current battery cell of the current battery, the current discharging current and the cell temperature when the current battery starts to be in the discharging state are obtained; when the current battery cell single voltage is less than or equal to a battery cell single voltage threshold value, determining a first SOC value of the current battery according to the current battery cell single voltage, the current discharging current and a cell temperature when the current battery starts to be in a discharging state; and calculating to obtain a second SOC value of the current battery by an ampere-hour integration method, and correcting the SOC of the current battery according to the first SOC value and the second SOC value. The method solves the problems of inaccurate calculation of the SOC of the lithium battery and poor correction effect on the SOC of the lithium battery, and realizes the calculation accuracy of the SOC of the lithium battery.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a flowchart of a method for correcting SOC of a lithium battery according to an embodiment of the present invention;

fig. 2 is a flowchart of a lithium battery SOC correction method according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a lithium battery SOC correction apparatus according to a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of an energy storage system for implementing the lithium battery SOC correction method according to the embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Example one

Fig. 1 is a flowchart of a lithium battery SOC correction method according to an embodiment of the present invention, where the present embodiment is applicable to a case of correcting an SOC of a lithium battery of a portable energy storage system power supply carrying a lithium iron phosphate battery, and the lithium battery SOC correction method may be executed by a lithium battery SOC correction apparatus, which may be implemented in a form of hardware and/or software, and the lithium battery SOC correction apparatus may be configured in an energy storage system. As shown in fig. 1, the method for correcting the SOC of the lithium battery includes:

s110, judging the working state of the current battery, and if the working state of the current battery is a discharging state, acquiring the current battery cell single voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state of the current battery.

The current battery may be a battery to be monitored in the energy storage system, and optionally, the current battery mounted in the energy storage system may be a lithium iron phosphate battery.

It can be known that the current working state of the battery can be a discharging state, a charging state, a sleeping state or a standing state, and the specific way of judging the current working state of the battery can be determined by the battery related information such as the cell voltage, the charging and discharging current or the charging and discharging voltage of the existing single battery, which is not limited in this embodiment.

In this embodiment, the current operating state of the battery is a discharging state, and optionally, the current discharging state of the battery may be a state that the battery enters a discharging end, that is, a stage close to completion of discharging in the discharging process of the current battery.

Specifically, when the battery management system BMS monitors that the working state of the current battery is the discharging state, the current battery core single voltage of the current battery is collected, and the current battery core single voltage is known to be the lowest battery core single voltage in the period from the beginning of discharging of the current battery to the current moment.

As described above, the voltage of the current cell voltage may be collected by using a voltage sensor for measurement, and the current discharge current may be collected by using a current sensor for measurement, and optionally, the current cell voltage and the current discharge current may also be detected by using a battery management system BMS.

In this embodiment, when the current working state of the battery is a discharging state, that is, the discharging state of the current battery may be when the battery enters the discharging end, the SOC of the lithium battery is corrected according to the current battery cell voltage, the current discharging current of the current battery, and the corresponding relationship between the cell temperature and the battery SOC when the current battery starts to be in the discharging state, which are detected in real time.

It can be understood that, through the pre-established correspondence table of the discharging end to the correction of the lithium battery SOC, the real SOC value of the current battery when entering the discharging end can be inquired, and further, through the correction of the discharging end lithium battery SOC, the better association between the lithium battery SOC and the battery cell single voltage can be realized, so that the product consistency of the battery and even the energy storage system is better.

And S120, when the current single battery cell voltage is smaller than or equal to a single battery cell voltage threshold, determining a first SOC value of the current battery according to the current single battery cell voltage, the current discharge current and the cell temperature when the current battery starts to be in a discharge state.

On the basis, whether the discharge end corrects the SOC of the lithium battery is determined based on the current cell voltage of the battery, namely when the current cell voltage of the battery is greater than the cell voltage threshold of the battery, the discharge end does not correct the SOC of the lithium battery; and when the current battery cell single voltage is less than or equal to the battery cell single voltage threshold, correcting the SOC of the lithium battery by the discharging tail end.

The method comprises the steps of converting data tables of SOC and monomer voltage under different temperatures and different discharge rates into a program look-up table by utilizing a three-dimensional array and a linear interpolation algorithm, and recording the three-dimensional array as a corresponding relation table of the discharge end for correcting the SOC of the lithium battery (the outermost layer of the three-dimensional array represents the temperature, the second outer layer represents the discharge rate, and the innermost layer represents the monomer voltage).

In this embodiment, the pre-established correspondence table of the discharging end for correcting the SOC of the lithium battery is searched according to the current cell voltage, the current discharging current, and the cell temperature when the current battery starts to be in a discharging state to obtain a first SOC value of the current battery, that is, the first SOC value is used as the actual SOC value of the current battery at the discharging end.

The battery cell individual voltage threshold may be obtained by querying according to the pre-established correspondence table of the discharge end for correcting the SOC of the lithium battery, and optionally, the battery cell individual voltage threshold may be the lowest battery cell individual voltage value that can be queried in the correspondence table when the first SOC value is less than 30%.

It can be understood that, when the first SOC value corresponding to the battery cell individual voltage threshold is less than 30%, it may also be other numerical value cases, for example, the battery cell individual voltage threshold may be 3% or 5%, and the specific numerical value selection may be set according to an actual discharging scenario, which is not limited in this embodiment.

S130, calculating to obtain a second SOC value of the current battery through an ampere-hour integration method, and correcting the SOC of the current battery according to the first SOC value and the second SOC value.

The ampere-hour integration method is characterized in that the SOC value of the battery is estimated on the basis of the initial time SOC0, and based on a calculation formula of the conventional ampere-hour integration method, the SOC value of the battery calculated by the ampere-hour integration method is related to the rated capacity and the charge-discharge efficiency of the battery, and the charge-discharge current and the corresponding time within a certain time, so that the SOC value of the battery is finally obtained.

In this embodiment, the second SOC value of the current battery calculated by the ampere-hour integration method is continuously calculated and updated along with the change of the discharge state of the battery, and the first SOC value of the current battery obtained by looking up the table is also continuously updated, it is known that the first SOC value and the second SOC value in the same battery discharge state are compared, and the correction of the current battery SOC can be realized after the dynamic adjustment.

Specifically, if the first SOC value is smaller than the second SOC value, the speed of estimating the second SOC value by the ampere-hour integration method is increased, so that the second SOC value approaches the first SOC value as soon as possible, and the second SOC value is controlled to be increased to correct the current battery SOC.

And if the first SOC value is larger than the second SOC value, slowing down the speed of estimating the second SOC value by an ampere-hour integration method, so that the second SOC value waits for the first SOC value to follow, and the second SOC value is controlled to slow down to correct the current battery SOC.

It can be known that after the current battery SOC is corrected according to the first SOC value and the second SOC value, the second SOC value of the current battery when the battery enters the discharging end is dynamically adjusted, so that the second SOC value changes as much as possible along with the change of the real first SOC value.

According to the technical scheme of the embodiment of the invention, by judging the working state of the current battery, if the working state of the current battery is a discharging state, the current battery cell monomer voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state of the current battery are obtained; when the current battery cell single voltage is less than or equal to a battery cell single voltage threshold value, determining a first SOC value of the current battery according to the current battery cell single voltage, the current discharging current and a cell temperature when the current battery starts to be in a discharging state; and calculating to obtain a second SOC value of the current battery by an ampere-hour integration method, and correcting the SOC of the current battery according to the first SOC value and the second SOC value. The method solves the problems of inaccurate calculation of the SOC of the lithium battery and poor correction effect on the SOC of the lithium battery, and realizes the calculation accuracy of the SOC of the lithium battery.

Example two

Fig. 2 is a flowchart of a lithium battery SOC correction method according to a second embodiment of the present invention, which further illustrates a method for calculating a charge/discharge capacity required by the ampere-hour integration method in the second embodiment of the present invention, and provides a corresponding method for calculating an SOC loss when a current battery is in a sleep state or a static state. As shown in fig. 2, the method for correcting the SOC of the lithium battery includes:

s110, judging the working state of the current battery, and if the working state of the current battery is the discharging state, acquiring the current battery cell single voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state of the current battery.

And S230, acquiring the battery rated capacity of the current battery, and calculating to obtain a second SOC value of the current battery through an ampere-hour integration method based on the battery rated capacity.

Because the battery capacity of the lithium iron phosphate battery is greatly influenced by the battery temperature, the capacity of the battery in a charging and discharging state is determined according to different environmental temperatures, and the SOC value can be calculated accurately in the charging and discharging state.

Specifically, when the current battery is in a discharging state, the maximum charging capacity of the lithium iron phosphate battery at different battery temperatures is converted into a program table look-up form by using a linear interpolation algorithm, a corresponding relation table of the maximum charging capacity of the battery and the temperature is generated so as to determine the corresponding relation of the maximum charging capacity and the temperature, and more accurate calculation of the SOC value of the battery is realized by monitoring the change of the capacity of the battery along with the temperature.

In this embodiment, when the current battery is in a discharging state, along with a change in battery temperature, a battery rated capacity of the current battery changes correspondingly, a battery maximum charging capacity and temperature correspondence table is queried based on a cell temperature when the current battery starts to be in the discharging state, and a maximum charging capacity corresponding to the current battery is obtained in real time; further, a second SOC value of the current battery is calculated by an ampere-hour integration method based on the maximum charging capacity at the moment.

On the basis, when the working state of the current battery is switched from a discharging state to a charging state, a second SOC value of the current battery in the charging state is determined by an ampere-hour integration method according to the maximum charging capacity.

It should be noted that, when the current battery is in a discharging state, or when the current battery stops discharging and shifts to a standing state or a sleeping state, regardless of the time length, at this time, if the working state of the current battery is switched to a charging state, the second SOC value may be determined according to the maximum charging capacity.

Similarly, when the current battery is in a charging state, the maximum discharge capacity of the lithium iron phosphate battery at different battery temperatures is converted into a program table look-up form by using a linear interpolation algorithm to generate a corresponding relation table of the maximum discharge capacity and the temperature of the battery so as to determine the corresponding relation of the maximum discharge capacity and the temperature, and more accurate calculation of the SOC value of the battery is realized by monitoring the change of the capacity of the battery along with the temperature.

In this embodiment, when a current battery is in a charging state, obtaining a cell temperature when the current battery starts to be in the charging state, and querying a battery maximum discharge capacity and temperature correspondence table according to the cell temperature when the current battery starts to be in the charging state to obtain the maximum discharge capacity of the current battery; the method comprises the steps that corresponding change occurs to the rated capacity of a current battery along with the change of the temperature of the battery, the maximum discharge capacity of the battery and a temperature corresponding relation table are inquired based on the temperature of a battery core when the current battery is in a charging state, and the maximum discharge capacity corresponding to the current battery is obtained in real time; and further, calculating to obtain a second SOC value of the current battery by an ampere-hour integration method based on the maximum discharge capacity at the moment.

On the basis, when the working state of the current battery is switched from a charging state to a discharging state, a second SOC value of the current battery in the discharging state is determined by an ampere-hour integration method according to the maximum discharging capacity.

It should be noted that, when the current battery is in a charging state, or when the current battery stops charging and shifts to a static state or a sleep state, regardless of the time length, at this time, if the working state of the current battery is switched to a discharging state, the second SOC value may be determined according to the maximum discharging capacity.

S240, correcting the current battery SOC according to the first SOC value and the second SOC value.

On the basis of the embodiment, if the current battery is in a dormant state, acquiring the dormant time length of the current battery and the dormant quiescent current in the dormant state; and obtaining the sleep SOC loss of the current battery according to the sleep time length and the sleep quiescent current.

Specifically, after the current battery enters the sleep state, the battery management system BMS starts a counter to start counting, and when the current battery is activated to exit the sleep state, the counter stops counting, so that the sleep time duration T of the current battery can be calculated.

Since more than one interrupt may occur in the actual count of the counter, the real-time clock may be set to ensure counting in the counter interrupt.

On the basis, the calculation formula of the sleep time length T of the current battery is as follows:

T＝N*count

wherein, N is the counter interrupt period calculated by the real-time clock; the count is the counter value when the current battery is in the dormant state.

Further, the sleep SOC loss of the present battery is obtained according to the sleep time length and the sleep quiescent current, which is specifically referred to as the following formula:

C＝I*T

wherein I is a dormant quiescent current; c is the consumption capacity of the dormant battery when the current battery is in the dormant state; c0 is the rated capacity of the battery; SOC1 is the current battery's resting SOC loss.

Similarly, on the basis of the above embodiment, if the current battery is in the stationary state, the stationary time length of the current battery and the stationary quiescent current in the stationary state are obtained; and obtaining the static SOC loss of the current battery according to the static time length and the static current.

Specifically, after the current battery enters the static state, the battery management system BMS starts a counter to start counting, and when the current battery is activated to exit the static state, the counter stops counting, so that the static time length T1 of the current battery can be calculated.

Further, the static SOC loss of the current battery is obtained according to the static time length and the static current, specifically referring to the following formula:

C1＝I1*T1

wherein, I1 is static current of standing; c1 is the static battery consumption capacity of the current battery in a static state; c0 is the rated capacity of the battery; SOC2 is the static SOC loss of the current battery.

According to the technical scheme of the embodiment of the invention, on the premise of ensuring the correct SOC of the battery, the battery temperature at the beginning of charging and discharging is considered to adjust the corresponding charging and discharging capacity, so that the correction accuracy of the SOC of the battery is further improved, and meanwhile, the corresponding SOC loss calculation of the battery is added when the current battery is in a dormant state or a standing state, so that the correct calculation of the SOC of the battery under different temperatures and different charging and discharging multiplying powers is realized, the service life of the lithium iron phosphate battery is prolonged, and the overall control effect of an energy storage system is improved.

EXAMPLE III

Fig. 3 is a schematic structural diagram of a lithium battery SOC correction device according to a third embodiment of the present invention. As shown in fig. 3, the lithium battery SOC correction apparatus includes:

the information obtaining module 310 is configured to perform judgment on a current working state of the battery, and if the current working state of the battery is a discharging state, obtain a current battery cell voltage, a current discharging current, and a cell temperature when the current battery starts to be in the discharging state of the battery;

a first SOC value determining module 320, configured to determine, when the current battery cell voltage is less than or equal to a battery cell voltage threshold, a first SOC value of the current battery according to the current battery cell voltage, the current discharging current, and a cell temperature when the current battery starts to be in a discharging state;

and the battery SOC correction module 330 is configured to calculate a second SOC value of the current battery by an ampere-hour integration method, and correct the current battery SOC according to the first SOC value and the second SOC value.

Optionally, the lithium battery SOC correction device further includes:

the battery rated capacity acquisition module is used for acquiring the battery rated capacity of the current battery;

Optionally, the lithium battery SOC correction apparatus further includes:

the maximum charging capacity acquisition module is used for inquiring a battery maximum charging capacity and temperature corresponding relation table based on the cell temperature when the current battery is in a discharging state to obtain the maximum charging capacity of the current battery;

Optionally, the lithium battery SOC correction device further includes:

the maximum discharge capacity acquisition module is used for acquiring the cell temperature when the current battery starts to be in the charging state if the working state of the current battery is the charging state, and inquiring a battery maximum discharge capacity and temperature corresponding relation table according to the cell temperature when the current battery starts to be in the charging state to obtain the maximum discharge capacity of the current battery;

Optionally, the modifying the current battery SOC according to the first SOC value and the second SOC value includes:

Optionally, the lithium battery SOC correction device further includes:

the dormancy information acquisition module is used for acquiring the dormancy time length of the current battery and the dormancy quiescent current in the dormancy state if the working state of the current battery is the dormancy state;

and the dormancy SOC loss determining module is used for obtaining the dormancy SOC loss of the current battery according to the dormancy time length and the dormancy quiescent current.

Optionally, the lithium battery SOC correction device further includes:

the standing information acquisition module is used for acquiring the standing time length of the current battery and the standing quiescent current in the standing state if the working state of the current battery is the standing state;

and the standing SOC loss determining module is used for obtaining the standing SOC loss of the current battery according to the standing time length and the standing quiescent current.

The lithium battery SOC correction device provided by the embodiment of the invention can execute the lithium battery SOC correction method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the lithium battery SOC correction method.

Example four

Fig. 4 illustrates a schematic structural diagram of an energy storage system 410 that may be used to implement an embodiment of the present invention. The energy storage system includes a digital computer that represents various forms, such as a laptop computer, a desktop computer, a workstation, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The energy storage system may also include a computing device that represents various forms, such as personal digital processing, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.

As shown in fig. 4, the energy storage system 410 includes at least one processor 411, and a memory communicatively connected to the at least one processor 411, such as a Read Only Memory (ROM) 412, a Random Access Memory (RAM) 413, and the like, wherein the memory stores computer programs executable by the at least one processor, and the processor 411 may perform various appropriate actions and processes according to the computer programs stored in the Read Only Memory (ROM) 412 or the computer programs loaded from the storage unit 418 into the Random Access Memory (RAM) 413. In the RAM 413, various programs and data required for the operation of the energy storage system 410 may also be stored. The processor 411, the ROM 412, and the RAM 413 are connected to each other through a bus 414. An input/output (I/O) interface 415 is also connected to bus 414.

A number of components in the energy storage system 410 are connected to the I/O interface 415, including: an input unit 416 such as a keyboard, a mouse, or the like; an output unit 417 such as various types of displays, speakers, and the like; a storage unit 418, such as a magnetic disk, optical disk, or the like; and a communication unit 419 such as a network card, modem, wireless communication transceiver, or the like. The communication unit 419 allows the energy storage system 410 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.

Processor 411 can be a variety of general and/or special purpose processing components with processing and computing capabilities. Some examples of processor 411 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, or the like. The processor 411 performs various methods and processes described above, such as a lithium battery SOC correction method.

In some embodiments, the lithium battery SOC correction method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 418. In some embodiments, part or all of the computer program may be loaded and/or installed onto the energy storage system 410 via the ROM 412 and/or the communication unit 419. When the computer program is loaded into the RAM 413 and executed by the processor 411, one or more steps of the lithium battery SOC correction method described above may be performed. Alternatively, in other embodiments, the processor 411 may be configured to perform the lithium battery SOC correction method in any other suitable manner (e.g., by way of firmware).

Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.

Computer programs for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.

In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide for interaction with a user, the systems and techniques described herein may be implemented on an energy storage system having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user may provide input to the energy storage system. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the Internet.

The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.

It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.

The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery SOC correction method is characterized by comprising the following steps:

when the current battery cell single voltage is less than or equal to a battery cell single voltage threshold value, determining a first SOC value of the current battery according to the current battery cell single voltage, the current discharging current and a cell temperature when the current battery starts to be in a discharging state;

2. The method for correcting the SOC of the lithium battery according to claim 1, wherein before the calculating the second SOC value of the current battery by the ampere-hour integration method, the method further comprises:

acquiring the battery rated capacity of the current battery;

3. The lithium battery SOC correction method of claim 2, wherein the lithium battery SOC correction method further comprises:

4. The lithium battery SOC correction method of claim 2, wherein the lithium battery SOC correction method further comprises:

5. The method for correcting the SOC of the lithium battery according to claim 1, wherein the correcting the current SOC of the battery according to the first SOC value and the second SOC value includes:

6. The lithium battery SOC correction method of claim 1, wherein the lithium battery SOC correction method further comprises:

7. The lithium battery SOC correction method of claim 1, wherein the lithium battery SOC correction method further comprises:

8. A lithium battery SOC correcting device is characterized by comprising:

9. An energy storage system, comprising:

at least one processor; and

the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform the lithium battery SOC correction method of any one of claims 1-7.

10. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions for causing a processor to implement the lithium battery SOC correction method of any one of claims 1-7 when executed.