A lithium battery soc correction method and device, energy storage system and storage medium

Abstract

The application 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 working state of a 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; when the current battery cell monomer voltage is less than or equal to the battery cell monomer voltage threshold, determining the first SOC value of the current battery according to 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; calculating the second SOC value of the current battery through the ampere-hour integral method, and correcting the current battery SOC according to the first SOC value and the second SOC value. The application realizes the calculation accuracy of the lithium battery SOC.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery management, and particularly relates to a lithium battery SOC correction method and device, an energy storage system and a storage medium. BACKGROUND

[0002] The portable energy storage system is a safe, portable, stable and environmentally friendly small energy storage system, which can provide a portable and movable green energy solution when far away from the indoor. In the lithium battery energy storage system, the battery SOC cannot be directly measured, and can only be estimated by the battery terminal voltage, charging and discharging current and internal resistance and other parameters, and these parameters will be affected by battery aging, environmental temperature changes and other uncertain factors.

[0003] At present, the existing portable energy storage system with lithium iron phosphate battery uses a constant battery capacity to calculate the charging and discharging soc, which causes the battery SOC calculation to be inaccurate when the environmental temperature is switched. Meanwhile, the existing portable energy storage system with lithium iron phosphate battery has poor battery SOC correction effect at the end of discharging. In addition, the existing portable energy storage system with lithium iron phosphate battery does not consider the corresponding hibernation battery SOC loss and static battery SOC loss when the lithium battery is in a hibernation state or a static state. SUMMARY

[0004] The present application provides a lithium battery SOC correction method, device, energy storage system and storage medium to solve the problems of inaccurate lithium battery SOC calculation and poor lithium battery SOC correction effect.

[0005] According to an aspect of the present application, a lithium battery SOC correction method is provided, which comprises:

[0006] determining the working state of the current battery, if the working state of the current battery is a discharging state, obtaining the current battery cell voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state of the current battery;

[0007] when the current battery cell voltage is less than or equal to the battery cell voltage threshold, determining the first SOC value of the current battery according to the current battery cell voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state;

[0008] calculating the second SOC value of the current battery by the ampere-hour integral method, and correcting the current battery SOC according to the first SOC value and the second SOC value.

[0009] Optionally, before the second SOC value of the current battery is calculated by the ampere-hour integration method, the method further comprises:

[0010] obtaining a battery rated capacity of the current battery;

[0011] the second SOC value of the current battery is calculated by the ampere-hour integration method based on the battery rated capacity.

[0012] the second SOC value of the current battery is calculated by the ampere-hour integration method based on the battery rated capacity.

[0013] Optionally, the lithium battery SOC correction method further comprises:

[0014] obtaining a maximum charging capacity of the current battery based on the cell temperature when the current battery starts to be in the discharging state by querying a battery maximum charging capacity and temperature correspondence table;

[0015] the second SOC value of the current battery is calculated by the ampere-hour integration method based on the battery rated capacity.

[0016] when the working state of the current battery is switched from the discharging state to the charging state, the second SOC value of the current battery in the charging state is determined by the ampere-hour integration method based on the maximum charging capacity.

[0017] Optionally, the lithium battery SOC correction method further comprises:

[0018] if the working state of the current battery is the charging state, obtaining a cell temperature when the current battery starts to be in the charging state, and obtaining a maximum discharging capacity of the current battery by querying a battery maximum discharging capacity and temperature correspondence table based on the cell temperature when the current battery starts to be in the charging state;

[0019] the second SOC value of the current battery is calculated by the ampere-hour integration method based on the battery rated capacity.

[0020] when the working state of the current battery is switched from the charging state to the discharging state, the second SOC value of the current battery in the discharging state is determined by the ampere-hour integration method based on the maximum discharging capacity.

[0021] Optionally, the correction of the SOC of the current battery based on the first SOC value and the second SOC value comprises:

[0022] if the first SOC value is less than the second SOC value, the speed of estimating the second SOC value by the ampere-hour integration method is accelerated to control the second SOC value to accelerate the correction of the SOC of the current battery;

[0023] if the first SOC value is greater than the second SOC value, slowing down the speed of estimating the second SOC value by ampere-hour integration method to control the second SOC value to slow down the correction of the current battery SOC.

[0024] Optionally, the lithium battery SOC correction method further comprises:

[0025] if the working state of the current battery is a sleep state, obtaining the sleep time length of the current battery and the sleep static current in the sleep state;

[0026] obtaining the sleep SOC loss of the current battery according to the sleep time length and the sleep static current.

[0027] Optionally, the lithium battery SOC correction method further comprises:

[0028] if the working state of the current battery is a sleep state, obtaining the sleep time length of the current battery and the sleep static current in the sleep state;

[0029] obtaining the sleep SOC loss of the current battery according to the sleep time length and the sleep static current.

[0030] According to another aspect of the present application, there is provided a lithium battery SOC correction device, which comprises:

[0031] an information obtaining module for judging the working state of the current battery, and if the working state of the current battery is a discharge state, obtaining the current battery cell voltage of the current battery, the current discharge current and the cell temperature at the time when the current battery starts to be in the discharge state;

[0032] a first SOC value determining module for determining the first SOC value of the current battery according to the current battery cell voltage, the current discharge current and the cell temperature at the time when the current battery starts to be in the discharge state when the current battery cell voltage is less than or equal to the battery cell voltage threshold value;

[0033] a battery SOC correction module for calculating the second SOC value of the current battery by ampere-hour integration method, and correcting the current battery SOC according to the first SOC value and the second SOC value.

[0034] According to another aspect of the present application, there is provided a power storage system, which comprises:

[0035] at least one processor; and

[0036] a memory in communication with the at least one processor; wherein

[0037] 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 perform the lithium battery SOC correction method according to any one of the embodiments of the present application.

[0038] According to another aspect of the present application, a computer readable storage medium is provided, which stores computer instructions for enabling a processor to implement the lithium battery SOC correction method according to any one of the embodiments of the present application when executed by the processor.

[0039] The technical scheme of the embodiments of the present application is to judge the working state of the current battery, if the working state of the current battery is a discharge state, the current battery cell voltage, the current discharge current and the cell temperature when the current battery starts to be in the discharge state are obtained; when the current battery cell voltage is less than or equal to the battery cell voltage threshold, the first SOC value of the current battery is determined according to the current battery cell voltage, the current discharge current and the cell temperature when the current battery starts to be in the discharge state; the second SOC value of the current battery is calculated by the ampere-hour integral method, and the current battery SOC is corrected according to the first SOC value and the second SOC value. The present application solves the problem of inaccurate calculation of lithium battery SOC and poor correction effect of lithium battery SOC, and realizes accurate calculation of lithium battery SOC.

[0040] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0042] Figure 1 is a flowchart of a lithium battery SOC correction method according to the first embodiment of the present application;

[0043] Figure 2 is a flowchart of a lithium battery SOC correction method according to the second embodiment of the present application;

[0044] Figure 3 is a structural schematic diagram of a lithium battery SOC correction device according to Embodiment Three of the present application;

[0045] Figure 4 is a structural schematic diagram of an energy storage system implementing a lithium battery SOC correction method according to the present application. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0047] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to the process, method, product, or device.

[0048] Embodiment One

[0049] Figure 1 A flowchart of a lithium battery SOC correction method according to Embodiment One of the present application is provided. The present embodiment can be applied to the case of correcting the SOC of a lithium battery of a portable energy storage system power supply equipped with a lithium iron phosphate battery. The lithium battery SOC correction method can be executed by a lithium battery SOC correction device, which can be implemented in the form of hardware and / or software, and can be configured in an energy storage system. As shown in the figure, the lithium battery SOC correction method includes: Figure 1

[0050] S110, determining the working state of the current battery, if the working state of the current battery is a discharging state, obtaining the current battery cell voltage, the current discharging current, and the cell temperature at the time when the current battery starts to be in the discharging state.

[0051] ​The current battery can be a battery to be monitored in the energy storage system. Optionally, the current battery carried in the energy storage system can be a lithium iron phosphate battery.

[0052] It is known that the working state of the current battery can be a discharge state, a charging state, a hibernation state or a static state. The specific method for determining the working state of the current battery can be determined by the existing battery related information such as battery cell voltage, charging and discharging current or charging and discharging voltage. The present embodiment does not make any limitation.

[0053] In the present embodiment, the working state of the current battery is a discharge state. Optionally, the discharge state of the current battery can be the case where the battery enters the end of discharge, that is, the stage close to the completion of the discharge process of the current battery.

[0054] Specifically, when the battery management system BMS monitors that the working state of the current battery is a discharge state, the current battery cell voltage of the current battery is collected. It is known that the current battery cell voltage is the lowest battery cell voltage in the time period from the start of the discharge of the current battery to the current time. Similarly, the cell temperature at the time when the current battery starts to be in a discharge state is collected. Optionally, the lowest cell temperature at the time when the current battery starts to be in a discharge state is collected.

[0055] As described above, the voltage of the current battery cell voltage can be collected by using a voltage sensor to measure, and the current discharge current can be collected by using a current sensor to measure. Optionally, the current battery cell voltage and the current discharge current can also be detected by the battery management system BMS. The present embodiment does not make any limitation on the specific collection method.

[0056] Since the SOC correction effect at the end of discharge of the existing portable energy storage system carrying lithium iron phosphate batteries is not ideal, in the present embodiment, when the working state of the current battery is a discharge state, that is, the discharge state of the current battery can be when the battery enters the end of discharge, the lithium battery SOC is corrected according to the corresponding relationship between the real-time detected current battery cell voltage of the current battery, the current discharge current and the cell temperature at the time when the current battery starts to be in a discharge state and the battery SOC.

[0057] It can be understood that the real SOC value of the current battery when entering the end of discharge can be queried through the pre-established corresponding relationship table for correcting the lithium battery SOC at the end of discharge. Further, by correcting the lithium battery SOC at the end of discharge, the lithium battery SOC and the battery cell voltage can be better associated, and the product consistency of the battery or even the energy storage system can be better.

[0058] S120, when the current battery cell voltage is less than or equal to the battery cell voltage threshold, determining a first SOC value of the current battery according to the current battery cell voltage, the current discharge current, and the cell temperature when the current battery starts to be in the discharge state.

[0059] On the basis of the above, it is determined whether to correct the SOC of the lithium battery at the discharge end based on the current battery cell voltage, that is, when the current battery cell voltage is greater than the battery cell voltage threshold, no correction of the SOC of the lithium battery at the discharge end is performed; and when the current battery cell voltage is less than or equal to the battery cell voltage threshold, correction of the SOC of the lithium battery at the discharge end is performed.

[0060] The pre-established corresponding relationship table for correcting the SOC of the lithium battery at the discharge end is a data table of the SOC and the cell voltage under different temperatures and different discharge rates, which is converted into a program lookup table form by using a three-dimensional array and a linear interpolation algorithm, and the three-dimensional array is denoted as the corresponding relationship table for correcting the SOC of the lithium battery at the discharge end (the outermost layer of the three-dimensional array represents the temperature, the next outer layer represents the discharge rate, and the innermost layer represents the cell voltage).

[0061] By querying the corresponding relationship table for correcting the SOC of the lithium battery at the discharge end, the corresponding relationship between the SOC and the cell voltage under different temperatures and different discharge rates can be determined, and the queried SOC is a real SOC value. In this embodiment, the first SOC value of the current battery is obtained by querying the pre-established corresponding relationship table for correcting the SOC of the lithium battery at the discharge end according to the current battery cell voltage, the current discharge current, and the cell temperature when the current battery starts to be in the discharge state, that is, the first SOC value is taken as the real SOC value of the current battery at the discharge end.

[0062] The battery cell voltage threshold can be obtained by querying the pre-established corresponding relationship table for correcting the SOC of the lithium battery at the discharge end. Optionally, the battery cell voltage threshold can be the lowest battery cell voltage value that can be queried in the corresponding relationship table when the first SOC value is 30% or less.

[0063] It can be understood that the first SOC value corresponding to the battery cell voltage threshold can be 30% or less, and other numerical conditions can also be used, for example, the battery cell voltage threshold can be 3% or 5% when the first SOC value is 3% or 5%. The specific numerical value can be set according to the actual discharge scene, and the embodiment does not limit this.

[0064] S130, a second SOC value of the current battery is calculated by the ampere-hour integration method, and the SOC of the current battery is corrected according to the first SOC value and the second SOC value.

[0065] Wherein, the ampere-hour integration method is to estimate the SOC value of the battery on the basis of SOC0 at the initial moment, the battery SOC value calculated by the ampere-hour integration method is related to the rated capacity of the battery, the charging and discharging efficiency, and the charging and discharging current and the corresponding time within a certain time, and finally the SOC value of the battery is obtained based on the calculation formula of the existing ampere-hour integration method.

[0066] In the embodiment, the second SOC value of the current battery calculated by the ampere-hour integration method is constantly calculated and updated as the discharge state of the battery changes, and the first SOC value of the current battery obtained by table lookup is also constantly updated. It is known that the first SOC value and the second SOC value under the same battery discharge state are compared, and the dynamic adjustment after the second SOC value can correct the current battery SOC.

[0067] Specifically, if the first SOC value is less than the second SOC value, the speed of estimating the second SOC value by the ampere-hour integration method is accelerated, so that the second SOC value approaches the first SOC value as soon as possible, so as to control the second SOC value to accelerate the correction of the current battery SOC.

[0068] If the first SOC value is greater than the second SOC value, the speed of estimating the second SOC value by the ampere-hour integration method is slowed down, so that the second SOC value waits for the first SOC value to follow, so as to control the second SOC value to slow down the correction of the current battery SOC.

[0069] It is 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 is dynamically adjusted when the battery enters the discharge end, so that the second SOC value changes as much as possible to follow the real first SOC value.

[0070] The technical scheme of the embodiment of the application judges the working state of the current battery, if the working state of the current battery is a discharge state, the current battery cell monomer voltage, the current discharge current and the cell temperature when the current battery starts to be in the discharge state are obtained; when the current battery cell monomer voltage is less than or equal to the battery cell monomer voltage threshold value, the first SOC value of the current battery is determined according to the current battery cell monomer voltage, the current discharge current and the cell temperature when the current battery starts to be in the discharge state; the second SOC value of the current battery is calculated by the ampere-hour integration method, and the current battery SOC is corrected according to the first SOC value and the second SOC value. The application solves the problems of inaccurate lithium battery SOC calculation and poor lithium battery SOC correction effect, and realizes accurate lithium battery SOC calculation.

[0071] Embodiment two

[0072] Figure 2 A flow chart of a lithium battery SOC correction method provided for embodiment two of the present application, the present embodiment further illustrates the charge and discharge capacity calculation method required in the ampere-hour integration method in the above-mentioned embodiments, and simultaneously provides a corresponding SOC loss calculation method when the current battery is in a dormant state or a static state. As shown in the figure, the lithium battery SOC correction method comprises: Figure 2

[0073] S110, judging the working state of the current battery, if the working state of the current battery is a discharge state, acquiring the current battery cell monomer voltage of the current battery, the current discharge current and the cell temperature when the current battery starts to be in the discharge state.

[0074] S120, when the current battery cell monomer voltage is less than or equal to the battery cell monomer voltage threshold value, determining the first SOC value of the current battery according to the current battery cell monomer voltage, the current discharge current and the cell temperature when the current battery starts to be in the discharge state.

[0075] S230, acquiring the battery rated capacity of the current battery, and calculating the second SOC value of the current battery by the ampere-hour integration method based on the battery rated capacity.

[0076] Since the battery capacity of the lithium iron phosphate battery is greatly affected by the battery temperature, the capacity of the battery in the charge and discharge state is determined according to different environmental temperatures, which can ensure the relative accuracy of the SOC value calculation in the charge and discharge state.

[0077] Specifically, when the current battery is in a discharge state, the maximum charge capacity of the lithium iron phosphate battery at different battery temperatures is converted into a program lookup table form by using a linear interpolation algorithm, a battery maximum charge capacity and temperature corresponding relationship table is generated to determine the corresponding relationship between the maximum charge capacity and the temperature, and more accurate battery SOC value calculation is realized by monitoring the capacity change of the battery with the temperature.

[0078] In the present embodiment, when the current battery is in a discharge state, the battery rated capacity of the current battery changes accordingly with the change of the battery temperature, the battery maximum charge capacity and temperature corresponding relationship table is queried based on the cell temperature when the current battery starts to be in the discharge state, and the corresponding maximum charge capacity of the current battery is obtained in real time; further, the second SOC value of the current battery is calculated by the ampere-hour integration method based on the maximum charge capacity at this time.

[0079] ​On the basis of the above, when the working state of the current battery is switched from the discharging state to the charging state, the second SOC value of the current battery in the charging state is determined according to the maximum charging capacity by the ampere-hour integration method.

[0080] It should be noted that when the current battery is in the discharging state, or when the current battery stops discharging and enters the resting state or the hibernation state, regardless of the length of time, if the working state of the current battery is switched to the charging state, the second SOC value can be determined according to the maximum charging capacity.

[0081] Similarly, when the current battery is in the charging state, the maximum discharging capacity of the lithium iron phosphate battery at different battery temperatures is converted into a program lookup table form by using a linear interpolation algorithm to generate a battery maximum discharging capacity and temperature correspondence table to determine the correspondence between the maximum discharging capacity and the temperature, and more accurate battery SOC value calculation is realized by monitoring the change of the battery capacity with the temperature.

[0082] In the embodiment, when the current battery is in the charging state, the cell temperature when the current battery starts to be in the charging state is obtained, and the maximum discharging capacity of the current battery is obtained by querying the battery maximum discharging capacity and temperature correspondence table according to the cell temperature when the current battery starts to be in the charging state; with the change of the battery temperature, the battery rated capacity of the current battery changes correspondingly, the maximum discharging capacity corresponding to the current battery is obtained in real time by querying the battery maximum discharging capacity and temperature correspondence table based on the cell temperature when the current battery starts to be in the charging state; further, the second SOC value of the current battery is calculated by the ampere-hour integration method based on the maximum discharging capacity at this time.

[0083] On the basis of the above, when the working state of the current battery is switched from the charging state to the discharging state, the second SOC value of the current battery in the discharging state is determined according to the maximum discharging capacity by the ampere-hour integration method.

[0084] It should be noted that when the current battery is in the charging state, or when the current battery stops charging and enters the resting state or the hibernation state, regardless of the length of time, if the working state of the current battery is switched to the discharging state, the second SOC value can be determined according to the maximum discharging capacity.

[0085] S240, correcting the SOC of the current battery according to the first SOC value and the second SOC value.

[0086] On the basis of the above embodiment, if the working state of the current battery is the sleep state, the sleep time length of the current battery and the sleep static current in the sleep state are obtained; and the sleep SOC loss of the current battery is derived according to the sleep time length and the sleep static current.

[0087] Specifically, after the current battery enters the sleep state, the battery management system BMS starts the counter to begin counting, and when the current battery is activated to exit the sleep state, the counter stops counting, so that the sleep time length T of the current battery can be calculated.

[0088] Since there may be more than one interruption in the actual counting of the counter, the counting in the counter interruption can be ensured by setting the real-time clock.

[0089] On the basis of the above, the calculation formula of the sleep time length T of the current battery is:

[0090] T=N*count

[0091] Wherein, N is the counter interruption period calculated by the real-time clock; count is the counter value of the current battery in the sleep state.

[0092] Further, the sleep SOC loss of the current battery is derived according to the sleep time length and the sleep static current, and the specific formula is as follows:

[0093] C=I*T

[0094]

[0095] Wherein, I is the sleep static current; C is the sleep battery consumption capacity of the current battery in the sleep state; C0 is the rated capacity of the battery; SOC1 is the sleep SOC loss of the current battery.

[0096] Similarly, on the basis of the above embodiment, if the working state of the current battery is the rest state, the rest time length of the current battery and the rest static current in the rest state are obtained; and the rest SOC loss of the current battery is derived according to the rest time length and the rest static current.

[0097] Specifically, after the current battery enters the rest state, the battery management system BMS starts the counter to begin counting, and when the current battery is activated to exit the rest state, the counter stops counting, so that the rest time length T1 of the current battery can be calculated.

[0098] Further, the rest SOC loss of the current battery is derived according to the rest time length and the rest static current, and the specific formula is as follows:

[0099] C1 = I1*T1

[0100]

[0101] Wherein, I1 is a static current; C1 is a static battery consumption capacity of the current battery in a static state; CO is a battery rated capacity; SOC2 is a static SOC loss of the current battery.

[0102] The technical scheme of the embodiment of the application, under the premise of ensuring the accuracy of the battery SOC correction, considers the battery temperature adjustment of the corresponding charging and discharging capacity when the battery starts charging and discharging, further improves the accuracy of the battery SOC correction, at the same time, adds the corresponding battery SOC loss calculation of the current battery in the sleep state or the static state, thereby realizing the accurate calculation of the battery SOC under different temperatures and different charging and discharging rates, prolonging the service life of the lithium iron phosphate battery, and improving the overall control effect of the energy storage system.

[0103] Embodiment three

[0104] Figure 3 A structure schematic diagram of a lithium battery SOC correction device provided by the embodiment three is shown in the figure. Figure 3 As shown in the figure, the lithium battery SOC correction device comprises:

[0105] The information acquisition module 310 is configured to determine the working state of the current battery, and 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 are acquired.

[0106] The first SOC value determination module 320 is configured to determine the first SOC value of the current battery according to 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 when the current battery cell monomer voltage is less than or equal to the battery cell monomer voltage threshold value.

[0107] The battery SOC correction module 330 is configured to calculate the second SOC value of the current battery by the ampere-hour integration method, and correct the current battery SOC according to the first SOC value and the second SOC value.

[0108] Optionally, the lithium battery SOC correction device further comprises:

[0109] The battery rated capacity acquisition module is configured to acquire the battery rated capacity of the current battery.

[0110] The second SOC value of the current battery is calculated by the ampere-hour integration method, comprising:

[0111] calculating a second SOC value of the current battery based on the battery rated capacity by ampere-hour integration method.

[0112] Optionally, the lithium battery SOC correction device further comprises:

[0113] a maximum charge capacity obtaining module, configured to query a battery maximum charge capacity and temperature correspondence table based on the cell temperature when the current battery starts to be in the discharging state, to obtain the maximum charge capacity of the current battery;

[0114] The calculating a second SOC value of the current battery based on the battery rated capacity by ampere-hour integration method comprises:

[0115] When the working state of the current battery is switched from the discharging state to the charging state, the second SOC value of the current battery in the charging state is determined by ampere-hour integration method according to the maximum charge capacity.

[0116] Optionally, the lithium battery SOC correction device further comprises:

[0117] a maximum discharge capacity obtaining module, configured to, if the working state of the current battery is the charging state, obtain the cell temperature when the current battery starts to be in the charging state, and query 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;

[0118] The calculating a second SOC value of the current battery based on the battery rated capacity by ampere-hour integration method comprises:

[0119] When the working state of the current battery is switched from the charging state to the discharging state, the second SOC value of the current battery in the discharging state is determined by ampere-hour integration method according to the maximum discharge capacity.

[0120] Optionally, the correcting the SOC of the current battery according to the first SOC value and the second SOC value comprises:

[0121] If the first SOC value is less than the second SOC value, the speed of estimating the second SOC value by ampere-hour integration method is accelerated, to control the second SOC value to accelerate the correction of the SOC of the current battery;

[0122] If the first SOC value is greater than the second SOC value, the speed of estimating the second SOC value by ampere-hour integration method is slowed down, to control the second SOC value to slow down the correction of the SOC of the current battery.

[0123] Optionally, the lithium battery SOC correction device further comprises:

[0124] The hibernation information acquisition module is configured to acquire a hibernation time length of the current battery and a hibernation static current in the hibernation state if the current battery is in the hibernation state.

[0125] The hibernation SOC loss determination module is configured to determine a hibernation SOC loss of the current battery according to the hibernation time length and the hibernation static current.

[0126] Optionally, the lithium battery SOC correction device further comprises:

[0127] The standing information acquisition module is configured to acquire a standing time length of the current battery and a standing static current in the standing state if the current battery is in the standing state.

[0128] The standing SOC loss determination module is configured to determine a standing SOC loss of the current battery according to the standing time length and the standing static current.

[0129] The lithium battery SOC correction device provided by the embodiment of the present application can execute the lithium battery SOC correction method provided by any embodiment of the present application, and has the corresponding function modules and beneficial effects of executing the lithium battery SOC correction method.

[0130] Embodiment four

[0131] Figure 4 A structural diagram of an energy storage system 410 that can be used to implement embodiments of the present application is shown. The energy storage system includes a representation of various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The energy storage system can also include a representation of various forms of mobile devices, such as personal digital assistants, cellular telephones, smart phones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit implementations of the applications described and / or claimed in this document.

[0132] As Figure 4As shown, the energy storage system 410 includes at least one processor 411, and a memory, such as a read-only memory (ROM) 412, a random access memory (RAM) 413, and the like, communicatively connected to the at least one processor 411, where the memory stores computer programs executable by the at least one processor. The processor 411 can perform various appropriate actions and processes according to the computer programs stored in the read-only memory (ROM) 412 or 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 can 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 the bus 414.

[0133] Various 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, and 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, an optical disk, and the like, and a communication unit 419, such as a network card, a modem, a wireless communication transceiver, and 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.

[0134] The processor 411 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the processor 411 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, and the like. The processor 411 performs various methods and processes described above, such as the lithium battery SOC correction method.

[0135] In some embodiments, the lithium battery SOC correction method can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 418. In some embodiments, part or all of the computer program can 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 onto the RAM 413 and executed by the processor 411, one or more steps of the lithium battery SOC correction method described above can be performed. Alternatively, in other embodiments, the processor 411 can be configured to perform the lithium battery SOC correction method by any other appropriate means, such as by means of firmware.

[0136] The various embodiments of the systems and techniques described above can be implemented in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a load programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0137] Computer programs used to implement the processes of the application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer program, when executed, can cause instructions defined in the flow charts and / or block diagrams to be implemented. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a standalone software package and partially on a remote machine or entirely on a remote machine or server.

[0138] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store computer programs for use by or in connection with an instruction execution system, apparatus, or device. Computer-readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk drives, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fibers, portable compact disc read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0139] To provide for interaction with a user, the systems and techniques described here can be implemented on a storage energy system having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the storage energy system. Other kinds of devices can be used to provide for interaction with a user as well; 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 can be received in any form, including acoustic, speech, or tactile input.

[0140] 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 a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0141] The computing system can 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. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0142] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the present disclosure can be executed in parallel, executed in sequence, or executed in a different order, as long as the desired results of the technical solutions of the present disclosure are achieved, and the present disclosure is not limited herein.

[0143] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall fall within the protection scope of the present application.

Claims

1. A lithium battery SOC correction method, characterized by, The method comprises the following steps: determining the working state of the current battery, if the working state of the current battery is a discharging state, obtaining the current battery cell voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state; when the current battery cell voltage is less than or equal to the battery cell voltage threshold, determining the first SOC value of the current battery according to the current battery cell voltage, the current discharging current and the cell temperature when the current battery starts to be in the discharging state; calculating the second SOC value of the current battery by ampere-hour integration method, and correcting the SOC of the current battery according to the first SOC value and the second SOC value; the correction of the SOC of the current battery according to the first SOC value and the second SOC value comprises: adjusting the second SOC value of the current battery when the battery enters the end of discharging, so that the second SOC value changes with the first SOC value.

2. The lithium battery SOC correction method according to claim 1, characterized by, Before the second SOC value of the current battery is calculated by the ampere-hour integration method, the method further comprises: obtaining the battery rated capacity of the current battery; the second SOC value of the current battery is calculated by the ampere-hour integration method based on the battery rated capacity. The lithium battery SOC correction method further comprises:

3. The lithium battery SOC correction method according to claim 2, characterized by, querying the battery maximum charging capacity and temperature corresponding relationship table based on the cell temperature when the current battery starts to be in the discharging state, to obtain the maximum charging capacity of the current battery; the second SOC value of the current battery is calculated by the ampere-hour integration method based on the battery rated capacity. The lithium battery SOC correction method further comprises: if the working state of the current battery is a charging state, obtaining the cell temperature when the current battery starts to be in the charging state, and querying the battery maximum discharging capacity and temperature corresponding relationship table based on the cell temperature when the current battery starts to be in the charging state, to obtain the maximum discharging capacity of the current battery; 4. The lithium battery SOC correction method according to claim 2, characterized by, the second SOC value of the current battery is calculated by the ampere-hour integration method based on the battery rated capacity. The lithium battery SOC correction method further comprises: if the working state of the current battery is a charging state, obtaining the cell temperature when the current battery starts to be in the charging state, and querying the battery maximum discharging capacity and temperature corresponding relationship table based on the cell temperature when the current battery starts to be in the charging state, to obtain the maximum discharging capacity of the current battery; the second SOC value of the current battery is calculated by the ampere-hour integration method based on the battery rated capacity.

5. The lithium battery SOC correction method according to claim 1, characterized by, The correction of the SOC of the current battery according to the first SOC value and the second SOC value comprises: if the first SOC value is less than the second SOC value, the speed of estimating the second SOC value by the ampere-hour integration method is accelerated to control the second SOC value to accelerate the correction of the SOC of the current battery; If the first SOC value is greater than the second SOC value, the speed of estimating the second SOC value by ampere-hour integration method is slowed down to control the second SOC value to slow down the correction of the current battery SOC.

6. The lithium battery SOC correction method according to claim 1, characterized by, The lithium battery SOC correction method further comprises: If the working state of the current battery is a sleep state, the sleep time length of the current battery and the sleep static current in the sleep state are obtained; The sleep SOC loss of the current battery is derived according to the sleep time length and the sleep static current.

7. The lithium battery SOC correction method according to claim 1, characterized by, The lithium battery SOC correction method further comprises: If the working state of the current battery is a sleep state, the sleep time length of the current battery and the sleep static current in the sleep state are obtained; The sleep SOC loss of the current battery is derived according to the sleep time length and the sleep static current.

8. A lithium battery SOC correction device characterized by comprising: Comprise: The information acquisition module is used to execute the judgment of the working state of the current battery, and if the working state of the current battery is a discharge state, the current battery cell voltage, the current discharge current and the cell temperature when the current battery starts to be in the discharge state of the current battery are obtained; The first SOC value determination module is used to execute the determination of the first SOC value of the current battery according to the current battery cell voltage, the current discharge current and the cell temperature when the current battery starts to be in the discharge state when the current battery cell voltage is less than or equal to the battery cell voltage threshold value; The battery SOC correction module is used to execute the calculation of the second SOC value of the current battery by ampere-hour integration method, and the correction of the current battery SOC according to the first SOC value and the second SOC value; The correction of the current battery SOC according to the first SOC value and the second SOC value comprises adjusting the second SOC value of the current battery when the battery enters the discharge end, so that the second SOC value changes with the first SOC value.

9. An energy storage system characterized by, The energy storage system comprises: At least one processor; and The memory is in communication connection with the at least one processor; wherein 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 lithium battery SOC correction method in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for enabling the processor to execute the lithium battery SOC correction method in any one of claims 1-7 when executed.

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