Method, device, control system and storage medium for state of charge termination

Abstract

The embodiments of the present application relate to the technical field of batteries, and in particular to a method, device, control system and storage medium for determining the state of charge. The method comprises: obtaining the net discharge capacity of the first battery cell from full charge to the current state during battery discharge; obtaining the available capacity of the first battery cell and the state of health (SOH) of the first battery cell; obtaining the current remaining dischargeable capacity of the first battery cell based on the nominal capacity of the battery, the net discharge capacity of the first battery cell, the available capacity of the first battery cell and the SOH of the first battery cell; when the sum of the current remaining dischargeable capacity of the first battery cell and the net discharge capacity of the first battery cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first battery cell is equal to the nominal capacity of the battery, setting the state of charge (SOC) of the first battery cell to 0. The method of the embodiment of the present application can more accurately estimate the state of charge (SOC) of a battery containing at least two different types of battery cells, thereby reducing the probability of the power-consuming device shutting down before the SOC reaches 0.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of batteries, and more particularly to a method, device, control system, and storage medium for state of charge termination. Background Art

[0002] Research on battery management systems (BMS) has become a new hot topic in battery research. Accurately estimating the battery's state of charge (SOC) is particularly difficult. The most commonly used SOC estimation methods in existing technical solutions include the open circuit voltage (OCV) method and the ampere-hour integration method. The open circuit voltage method is based on the battery's OCV-SOC curve. The battery's SOC is obtained by looking up the current OCV in a table, thereby accurately determining the battery's remaining capacity. The ampere-hour integration method calculates the SOC based on the integration of current over time, which can accurately calculate the battery's remaining capacity.

[0003] However, the above methods can only be used when the battery cells are of the same type. In this case, the capacity, charge and discharge patterns, and aging patterns of the individual cells are similar, making the battery capacity, charge and discharge patterns, and aging patterns basically consistent with the parameter change patterns of a single cell. Therefore, the error in the battery SOC estimated by the BMS based on the capacity change pattern of a single cell is relatively small.

[0004] However, in the actual manufacturing process, there may be situations where the battery contains at least two different types of battery cells, and the parameters such as capacity, charge and discharge patterns, and aging patterns of different types of battery cells vary greatly. Therefore, using traditional battery SOC estimation methods to estimate the SOC of such batteries will obviously result in large errors, especially when the SOC is close to 0. If the SOC estimation is inaccurate, it may cause the power-consuming device to shut down midway and fail to complete the budgeted task as expected by the user. Summary of the Invention

[0005] In view of the above problems, the embodiments of the present application provide a method, device, control system and storage medium for state of charge termination, which can more accurately estimate the state of charge (SOC) of a battery containing at least two different types of battery cells, thereby reducing the probability of an electrical device shutting down due to the remaining discharge capacity being 0 before the SOC reaches 0.

[0006] According to a first aspect of an embodiment of the present application, a method for terminating a state of charge is provided, the method comprising: during a battery discharge process, obtaining a net discharge capacity of a first battery cell from a full charge to a current state; the battery comprising at least a first type of battery cell and a second type of battery cell, the first type of battery cell and the second type of battery cell being battery cells made of different positive electrode materials, and the first battery cell being either the first type of battery cell or the second type of battery cell;

[0007] Obtaining the available capacity of the first battery cell and the state of health (SOH) of the first battery cell;

[0008] Obtaining a current remaining discharge capacity of the first battery cell based on the nominal capacity of the battery, the net discharge capacity of the first battery cell, the available capacity of the first battery cell, and the SOH of the first battery cell;

[0009] When the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first battery cell is equal to the nominal capacity of the battery, the state of charge SOC of the first battery cell is set to 0.

[0010] By adopting the above solution, the nominal capacity of the battery is set at a certain value when the battery leaves the factory; the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is a variable, which is determined by the positive electrode material of the first battery cell and is also affected by factors such as temperature and the health status of the first battery cell. When the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is greater than or equal to the nominal capacity of the battery, the open circuit voltage of the first battery cell is higher. If the open circuit voltage method is used, the SOC of the first battery cell obtained by looking up the table is higher. However, in an actual battery, not all types of battery cells have the sum of the current remaining discharge capacity and the net discharge capacity greater than or equal to the nominal capacity of the battery. Therefore, if the SOC of the battery is obtained based on the SOC of the first battery cell, the SOC of the battery is higher than the actual remaining discharge capacity of the battery. This will result in the displayed battery SOC not reaching 0, while the remaining discharge capacity of the battery is already 0, thereby causing the power-consuming device to shut down midway. In this embodiment of the present application, the SOC cutoff time of the first battery cell is set based on the net discharge capacity, so that when the first battery cell discharges its nominal capacity, the SOC of the first battery cell is displayed as 0, and at this time the remaining dischargeable capacity of the first battery cell is greater than or equal to 0. Therefore, the SOC of the battery is obtained based on the SOC of the first battery cell. When the battery SOC is 0, the remaining dischargeable capacity of the battery is greater than or equal to 0, thereby reducing the probability of the electrical device shutting down before the battery SOC displays 0.

[0011] In some embodiments, the method for cutting off the state of charge also includes: when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, and the SOC of the first battery cell is less than the cutoff capacity S1, setting the SOC of the first battery cell to S1; S1 is greater than 0.

[0012] By adopting the above solution, when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, the SOC of the first battery cell calculated using the ampere-hour integration method is low, but not all types of battery cells in the actual battery have the sum of the current remaining discharge capacity and the net discharge capacity less than the nominal capacity. Therefore, if the SOC of the battery is obtained based on the SOC of the first battery cell, the value of the SOC of the battery is less than the actual remaining discharge capacity of the battery, and as the discharge time accumulates, the error of the SOC becomes larger and larger, which will cause the displayed SOC of the battery to reach 0, while the remaining discharge capacity of the battery is much greater than 0, resulting in the inability to fully release the available capacity of the battery, resulting in capacity waste, and the user will also have doubts about the capacity of the battery. In this example of the present application, the SOC of the first battery cell is set to a constant value for a period of time before it drops to 0. At this time, the remaining dischargeable capacity of the first battery cell decreases with the discharge process. Therefore, the difference between the remaining dischargeable capacity of the first battery cell and the SOC gradually decreases, thereby reducing the error in the estimated SOC of the first battery cell. The error in the SOC of the battery estimated based on the SOC of the first battery cell will also decrease. When the SOC of the battery is 0, the available capacity of the battery can be released as much as possible, thereby improving user satisfaction.

[0013] In some embodiments, the method for cutting off the state of charge also includes: when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, and the voltage of the first battery cell is lower than the cut-off voltage V1, and the current of the first battery cell is less than the cut-off current A1, setting the SOC of the first battery cell to 0.

[0014] By adopting the above solution, the values ​​of V1 and A1 can be preset on the BMS. When the voltage of the first battery cell is lower than the cut-off voltage V1 and the current of the first battery cell is less than the cut-off current A1, the SOC of the first battery cell is set from S1 to 0, thereby reducing the SOC estimation error of the first battery cell, thereby reducing the error of the SOC of the battery estimated based on the SOC of the first battery cell, and ensuring that when the SOC of the battery is 0, the battery can discharge its available capacity as completely as possible.

[0015] In some embodiments, the current remaining dischargeable capacity of the first battery cell is obtained according to the following formula:

[0016] C1=C0*SOH-(C0-C T )-C2,

[0017] Wherein, C1 is the current remaining discharge capacity of the first battery cell;

[0018] C0 is the nominal capacity of the battery;

[0019] C T The available capacity of the first battery cell based on the current temperature;

[0020] C2 is the net discharge capacity of the first cell;

[0021] SOH is the current health state SOH of the first battery cell, ranging from 0% to 100%.

[0022] By adopting the above solution, the current remaining discharge capacity of the first battery cell is related to the current temperature and current health status of the first battery cell. The calculated current remaining discharge capacity of the first battery cell has a small error and high data accuracy.

[0023] In some embodiments, the nominal capacity of the battery is less than or equal to the initial available capacity of the second battery cell; the second battery cell is the battery cell with the smallest initial available capacity in the battery.

[0024] By adopting the above solution, since the user knows the capacity of the battery through the nominal capacity of the battery, the nominal capacity set in this way can ensure that the battery can at least reach the nominal capacity value in the initial stage of use.

[0025] In some embodiments, obtaining the net discharge capacity of the first battery cell from full charge to the current state further includes:

[0026] Determine whether there is a third battery cell whose voltage is less than the terminal voltage V2, and whose current is less than the terminal current A2, and whose SOC is less than the terminal capacity S2. If so, obtain the net discharge capacity of the first battery cell from full charge to the current; the third battery cell is any one of the first type battery cell or the second type battery cell.

[0027] By adopting the above solution, the terminal voltage V2, terminal current A2 and terminal capacity S2 are used for judgment, ensuring that the judgment of whether to set the SOC of the first battery cell to 0 is made when the SOC of the battery is actually close to 0, thereby reducing the number of system judgments.

[0028] In some embodiments, the battery state of charge (SOC) is determined according to the following formula: 总 :

[0029] SOC 总 =SOC min / (1-SOC max +SOC min )*100%,

[0030] Among them, SOC总 is the battery's state of charge;

[0031] SOC min The state of charge of the lowest-charge cell in the battery;

[0032] SOC max It is the state of charge of the cell with the highest capacity in the battery.

[0033] By adopting the above solution, the state of charge of each cell in the battery is more accurate, so the state of charge SOC of the battery calculated according to the state of charge of the cell is 总 It is also more precise.

[0034] According to a second aspect of an embodiment of the present application, a device for controlling a state of charge cutoff is provided, comprising:

[0035] a processing unit configured to obtain a net discharge capacity of a first battery cell from full charge to the current state; the battery comprises at least a first type battery cell and a second type battery cell, the first type battery cell and the second type battery cell being battery cells of different capacities, and the first battery cell being any one of the first type battery cell and the second type battery cell; and

[0036] Used to obtain the available capacity of the first battery cell and the health state SOH of the first battery cell; and

[0037] Used to obtain the current remaining discharge capacity of the first battery cell based on the nominal capacity of the battery, the net discharge capacity of the first battery cell, the available capacity of the first battery cell and the SOH of the first battery cell;

[0038] Setting unit: used to set the state of charge SOC of the first battery cell to 0 when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first battery cell is equal to the nominal capacity of the battery.

[0039] In some embodiments, the setting unit is further used to: when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, and the state of charge SOC of the first battery cell is less than the cut-off capacity S1, set the SOC of the first battery cell to S1; S1 is greater than 0.

[0040] In some embodiments, the processing unit is further configured to obtain the current remaining dischargeable capacity of the first battery cell according to the following formula:

[0041] C1=C0*SOH-(C0-C T )-C2,

[0042] Wherein, C1 is the current remaining discharge capacity of the first battery cell;

[0043] C0 is the nominal capacity of the battery;

[0044] C T The available capacity of the first battery cell based on the current temperature;

[0045] C2 is the net discharge capacity of the first cell;

[0046] SOH is the current health status of the first battery cell, ranging from 0% to 100%.

[0047] In some embodiments, the nominal capacity of the battery is less than or equal to the initial available capacity of the second battery cell; the second battery cell is the battery cell with the smallest initial available capacity in the battery.

[0048] In some embodiments, the processing unit obtaining the net discharge capacity of the first battery cell from full charge to the current state includes:

[0049] The processing unit determines whether the voltage of the third battery cell is less than the terminal voltage V2, the current of the third battery cell is less than the terminal current A2, and the SOC of the third battery cell is less than the terminal capacity S2. If so, the net discharge capacity of the first battery cell from full charge to the current is obtained; the third battery cell is any one of the first type battery cell or the second type battery cell.

[0050] In some embodiments, the processing unit determines the battery state of charge (SOC) according to the following formula: 总 :

[0051] SOC 总 =SOC min / (1-SOC max +SOC min )*100%,

[0052] Among them, SOC 总 is the battery's state of charge;

[0053] SOC min The state of charge of the lowest-charge cell in the battery;

[0054] SOC max It is the state of charge of the cell with the highest capacity in the battery.

[0055] According to a third aspect of an embodiment of the present application, a system for controlling state of charge cutoff is provided, including a memory, a processor, and a bus, wherein the memory and the processor communicate with each other via the bus;

[0056] The memory is used to store executable program codes;

[0057] The processor is configured to read the executable program code stored in the memory to execute the state of charge termination method of the above embodiment.

[0058] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is run on a computer, the computer executes the state of charge termination method of the above embodiment.

[0059] The embodiment of the present application determines the state of charge (SOC) of any first cell in a battery having two types of cells. When the sum of the current remaining discharge capacity of the first cell and the net discharge capacity of the first cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first cell is equal to the nominal capacity of the battery, the state of charge (SOC) of the first cell is set to 0. This allows the first cell to display a SOC of 0 when discharging its nominal capacity, while the remaining discharge capacity of the first cell is greater than or equal to 0. Therefore, the SOC of the battery is obtained based on the SOC of the first cell. When the SOC of the battery is 0, the remaining discharge capacity of the battery is greater than or equal to 0, thereby reducing the probability of the power-consuming device shutting down before the battery displays the SOC as 0.

[0060] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0062] Figure 1 This is a structural diagram of an electrical device according to an embodiment of the present application.

[0063] Figure 2 This is a flow chart of a method for terminating the state of charge in an embodiment of the present application.

[0064] Figure 3 Flowchart of another method for cutting off the state of charge in an embodiment of the present application.

[0065] Figure 4 This is a flowchart of step 101 in an embodiment of the present application.

[0066] Figure 5 This is a flow chart of a method for setting the net discharge capacity of a first battery cell in an embodiment of the present application.

[0067] Figure 6This is a structural diagram of a device for controlling the state of charge cutoff in an embodiment of the present application.

[0068] Figure 7 This is a structural diagram of a system for controlling the state of charge cutoff in an embodiment of the present application. DETAILED DESCRIPTION

[0069] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0071] The terms "comprises", "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0072] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0073] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0074] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0075] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0076] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a fixing member, such as a screw, bolt, or other fixing member. A physical connection can also be a detachable connection, such as a mutual snap-fit ​​connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. "Connected" or "connected" in a circuit structure can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is interconnected. It can also refer to internal communication between two elements. A signal connection can refer to a signal connection through a circuit or a signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application.

[0077] The embodiments of the present application provide a method for determining the state of charge, which is applicable to batteries including at least two types of cells, wherein the batteries may be battery packs, battery modules, battery packs, etc. For the sake of convenience, the present application collectively refers to them as batteries. In addition, the batteries in the embodiments of the present application include a battery management system (BMS), and the methods in the embodiments of the present application can be specifically applied to the BMS. Of course, the BMS in the embodiments of the present application can also be an independent device or equipment, and the BMS can also control the battery or cell to set the state of charge of the battery or cell according to the method for determining the state of charge provided in the embodiments of the present application.

[0078] Taking the example of a battery comprising two types of cells, the two types of cells can be named as a first type of cell and a second type of cell, respectively, wherein the first type of cell and the second type of cell are cells using different positive electrode materials. For example, the first type of cell and the second type of cell can be two different types of cells, such as lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries; or, when the first type of cell and the second type of cell are the same type of cell, such as lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, the specific positive electrode materials of the cells can be different. For example, when the first type of cell and the second type of cell are both lithium-ion batteries, their specific positive electrode materials can be two different types of cells, such as lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, or ternary materials.

[0079] Because the positive electrode materials of the first type of battery cell and the second type of battery cell are different, their capacity attenuation patterns, aging patterns, and charge-discharge performance are all different. Therefore, even if the initial available capacity of the two types of battery cells is the same, the available capacity of the two types of battery cells will gradually differ during use. In addition, due to the performance requirements of the battery, the initial available capacity of the first type of battery cell and the second type of battery cell will also be set to different. For example, to prevent a certain type of battery cell with rapid aging from affecting the capacity of the entire battery, the initial capacity of such battery cell will be greater than the nominal capacity of the battery. The BMS will limit the capacity usage range of such battery cell before the cell ages, and gradually open up the usage range as the cell ages.

[0080] Therefore, for the state of charge of this type of battery, if the SOC estimation method in the existing technical solution is used for estimation, there will obviously be a large error, especially when the SOC is close to 0. If the SOC estimation is inaccurate, it may cause the electrical device to be unable to complete the budgeted task as expected by the user.

[0081] For example, Figure 1 As shown, the electrical device is a car 2 as an example. Car 2 includes a battery 200, a controller 210, and a motor 220. Battery 200 is used to supply power to controller 210 and motor 220, serving as the operating and driving power source for car 2. For example, battery 200 is used to meet the power requirements of car 2 during startup, navigation, and operation. Battery 200 supplies power to controller 210, which in turn controls battery 200 to supply power to motor 220. Motor 220 receives and uses the power from battery 200 as the driving power source for car 2, replacing or partially replacing fuel or natural gas to provide driving power for car 2.

[0082] At any point in the use of vehicle 2, the actual available capacity of any of the multiple cells in battery 200 may be greater than, equal to, or less than the nominal capacity of battery 200. The actual available capacity refers to the available capacity of a cell based on factors such as its own material, current temperature, and health status.

[0083] When the actual available capacity of a cell in the battery 200 is larger than the nominal capacity of the battery 200, if the open circuit voltage (OCV) of the cell is used to correct the SOC of the cell and the SOC of the battery is obtained based on the SOC of the cell, the SOC of the battery is higher than the remaining discharge capacity of the battery, resulting in the SOC of the battery 200 not reaching 0, while the actual remaining discharge capacity of the battery is already 0. For example, if the nominal capacity promised by the battery 200 at the factory is 100Ah, during use, the capacity of one of the cells is 110Ah, and when the battery 200 is fully charged (the battery 200 reaches 100%), the SOC of the battery is higher than the remaining discharge capacity of the battery. ) and then starts to discharge 100Ah. The actual remaining dischargeable capacity of battery 200 should be 0. However, if the OCV-SOC curve is checked based on a cell with a capacity of 110Ah, the SOC of the cell is (110Ah-100Ah) / 110Ah*100%=9%. Obviously, the SOC of battery 200 obtained based on the SOC of this cell is not 0, which is inconsistent with the actual remaining dischargeable capacity of battery 200, thereby causing the power-consuming device to stop midway, for example, causing car 2 to break down midway.

[0084] On the contrary, when the actual available capacity of a certain cell in battery 200 is smaller than the nominal capacity of battery 200, if the ampere-hour integration method is used to calculate the SOC of the cell, and the SOC of battery 200 is obtained based on the SOC of the cell, the obtained SOC of battery 200 is less than the actual remaining discharge capacity of battery 200. As time accumulates, the error between the SOC of battery 200 and the remaining discharge capacity of battery 200 becomes larger and larger, so that the SOC of battery 200 has reached 0, while the remaining discharge capacity of battery 200 is much greater than 0, resulting in the inability to fully release the available capacity of battery 200, causing capacity waste. Users cannot accurately estimate the mileage that car 2 can travel based on the nominal capacity, and thus have doubts about the capacity of battery 200.

[0085] In view of this, if Figure 2 As shown, a method for terminating the state of charge provided in an embodiment of the present application includes:

[0086] Step 101: During the battery discharge process, obtain the net discharge capacity of the first battery cell from full charge to the current state.

[0087] The term "first cell" refers to any cell of the first type or the second type; "fully charged" refers to a state of charge of the first cell of 100%. Of course, "fully charged" may also refer to a state of charge of the first cell of other values, which is not limited in this application. "Current" refers to the moment when the net discharge capacity is obtained.

[0088] Step 102: Obtain the available capacity of the first battery cell and the state of health (SOH) of the first battery cell.

[0089] The available capacity refers to the available capacity of the first battery cell based on the current temperature; the health state SOH is also called the aging degree, which ranges from 0% to 100%. As the number of charge and discharge times of the first battery cell increases, the SOH of the first battery cell also decreases.

[0090] Step 103: Obtain the current remaining discharge capacity of the first battery cell based on the nominal capacity of the battery, the net discharge capacity of the first battery cell, the available capacity of the first battery cell, and the SOH of the first battery cell.

[0091] The nominal capacity of a battery is set at the factory and is a fixed value. For example, in some embodiments, the nominal capacity of a battery is less than or equal to the initial available capacity of the second battery cell. The second battery cell is defined as the battery cell with the smallest initial available capacity. The second battery cell can be the same as or different from the first battery cell. This nominal capacity value can be directly stored in the BMS for easy access.

[0092] Step 104: When the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first battery cell is equal to the nominal capacity of the battery, setting the state of charge (SOC) of the first battery cell to 0.

[0093] By adopting the solution of the above-described embodiment of the present application, the SOC cutoff time is set for the first battery cell based on the net discharge capacity. When the first battery cell discharges its nominal capacity, the SOC of the first battery cell is displayed as 0, and at this time, the remaining dischargeable capacity of the first battery cell is greater than or equal to 0. Therefore, the SOC of the battery is obtained based on the SOC of the first battery cell. When the battery SOC is 0, the remaining dischargeable capacity of the battery is greater than or equal to 0, thereby reducing the probability of the electrical device shutting down before the battery SOC reaches 0.

[0094] The technical solution of the embodiment of the present application better overcomes the problem in the related art that the open circuit voltage method is used to estimate the SOC of the first battery cell, and when the SOC of the battery is obtained based on the SOC of the first battery cell, the SOC of the battery is higher than the actual remaining discharge capacity of the battery, and the displayed SOC of the battery has not reached 0, while the remaining discharge capacity of the battery is already 0, thereby causing the electrical device to shut down midway.

[0095] In addition, in addition to the situation where the sum of the current remaining discharge capacity of the first cell and the net discharge capacity of the first cell is greater than or equal to the nominal capacity of the battery, there may also be a situation in the battery where the sum of the current remaining discharge capacity of the first cell and the net discharge capacity of the first cell is less than the nominal capacity. For example, as the number of charge and discharge cycles of the first cell increases, the capacity of the first cell decays. In this case, if the BMS calculates the SOC of the first cell based on the ampere-hour integration method, the obtained SOC of the first cell is lower. If the BMS continues to obtain the SOC of the battery based on the SOC of the first cell, the SOC value of the battery is less than the actual remaining discharge capacity of the battery, and as the discharge time accumulates, the error in the SOC becomes larger and larger. This will cause the displayed SOC of the battery to reach 0, while the remaining discharge capacity of the battery is much greater than 0, resulting in the inability to fully release the available capacity of the battery, resulting in capacity waste, and the user will also have doubts about the battery capacity.

[0096] Optional, such as Figure 3 As shown, in some embodiments, the method for cutting off the state of charge further includes:

[0097] Step 105 : When the sum of the current remaining dischargeable capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, and the SOC of the first battery cell is less than the cutoff capacity S1 , setting the SOC of the first battery cell to S1 .

[0098] Wherein S1 is a preset value greater than 0, for example, S1 is set to 2%, and is stored in the BMS for direct call. When the SOC of the first battery cell is less than 2%, the SOC of the first battery cell is set to 2%.

[0099] Optionally, in some embodiments, the method for cutting off the state of charge also includes: step 106: when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, and the voltage of the first battery cell is lower than the cut-off voltage V1, and the current of the first battery cell is less than the cut-off current A1, setting the SOC of the first battery cell to 0.

[0100] Among them, the values ​​of V1 and A1 can be preset on the BMS. For example, the value of V1 is the voltage value of the battery cell whose actual available capacity is equal to the nominal capacity when its remaining dischargeable capacity is equal to 0, and the value of A1 is the current value of the battery cell whose actual available capacity is equal to the nominal capacity when its remaining dischargeable capacity is equal to 0.

[0101] By adopting the solution of the above embodiment, the SOC calculated for the first battery cell is set to a constant value S1 for a period of time before it becomes 0. At this time, the remaining discharge capacity of the first battery cell decreases with the discharge process. Therefore, the difference between the remaining discharge capacity of the first battery cell and the SOC gradually decreases.

[0102] When the voltage of the first battery cell is lower than the cut-off voltage V1 and the current of the first battery cell is less than the cut-off current A1, the SOC of the first battery cell is set from S1 to 0, thereby improving the accuracy of the first battery cell at the SOC cut-off and reducing the SOC estimation error of the first battery cell, thereby reducing the error of the battery SOC estimated based on the SOC of the first battery cell, ensuring that when the battery SOC is 0, the battery can discharge its available capacity as completely as possible, thereby improving user satisfaction.

[0103] Optional, such as Figure 4 As shown, in some embodiments, step 101 may include:

[0104] Step 1011: Determine whether the voltage of the third battery cell is less than the terminal voltage V2, the current of the third battery cell is less than the terminal current A2, and the SOC of the third battery cell is less than the terminal capacity S2. If so, execute step 1012.

[0105] The third battery cell is any one of the first type battery cell and the second type battery cell. It can be understood that the third battery cell and the first battery cell and the second battery cell can be the same battery cell or different battery cells.

[0106] Step 1012: Obtain the net discharge capacity of the first battery cell from full charge to the current state.

[0107] In the above scheme of this embodiment, V2, A2, and S2 are respectively the voltage value, current value, and capacity value close to the end of discharge of the third battery cell. The end of discharge refers to the discharge process when the SOC of the third battery cell is close to 0. For example, the discharge process after the capacity of the third battery cell is less than 10% can be defined as the end of discharge. At this time, V2 is the voltage when the capacity of the third battery cell is 10%, A2 is the current when the capacity of the third battery cell is 10%, and S2 is 10%. The specific values ​​of V2, A2, and S2 depend on the nominal capacity of the battery and the usage scenario. Among them, V2, A2, and S2 can all be stored in the BMS system.

[0108] The terminal voltage V2, the terminal current A2 and the terminal capacity S2 are used to determine whether it is necessary to obtain the net discharge capacity of the first battery cell from full charge to the current state, and to ensure that the instructions of step 1012 and steps 102 to 106 are executed when the SOC of the third battery cell is actually close to 0, thereby reducing the number of operations of the BMS system.

[0109] Optionally, in some embodiments, in step 103, the BMS obtains the current remaining dischargeable capacity of the first battery cell according to the following formula:

[0110] C1=C0*SOH-(C0-C T )-C2,

[0111] Wherein, C1 is the current remaining discharge capacity of the first battery cell; C0 is the nominal capacity of the battery; C T is the available capacity of the first battery cell based on the current temperature; C2 is the net discharge capacity of the first battery cell; SOH is the current health state SOH of the first battery cell, ranging from 0% to 100%.

[0112] In the above formula, the current remaining discharge capacity of the first battery cell is closely related to the current temperature and current health status of the first battery cell, so the current remaining discharge capacity of the first battery cell can be calculated more accurately, with a small calculation error and high data accuracy.

[0113] It should be noted that, in some embodiments, the calculation of the net discharge capacity of the first battery cell is based on one discharge process as one cumulative cycle, wherein one discharge process refers to the process between two adjacent full charges of the battery. During one discharge process, the battery may only discharge, or may alternate between discharge and charge. Therefore, in the embodiments of the present application:

[0114] The net discharge capacity of the first battery cell at the current moment = cumulative discharge capacity - cumulative charge capacity,

[0115] The cumulative discharge capacity is the total discharge capacity of the first battery cell from the last full charge to the current time, and the cumulative charge capacity is the total charge capacity of the first battery cell from the last full charge to the current time.

[0116] The above operations can all be performed by BMS.

[0117] Optional, such as Figure 5 As shown, the net discharge capacity of the first battery cell is set by the following method:

[0118] Step 201: Determine whether the first battery cell is fully charged. If so, execute step 202.

[0119] Step 202: Set the net discharge capacity of the first battery cell to 0.

[0120] Through the solution of the above-mentioned embodiment of the present application, each time the first battery cell reaches full charge, the net discharge capacity of the first battery cell is reset to zero. Subsequently, when the BMS calculates the net discharge capacity, it is more convenient to retrieve data.

[0121] Optionally, in some embodiments, the method for determining the state of charge further includes: setting the SOC of the battery based on the SOC of each cell in the battery. 总 .

[0122] Among them, BMS determines the battery state of charge SOC according to the following formula 总 :

[0123] SOC 总 =SOCmin / (1-SOC max +SOC min )*100%,

[0124] Among them, SOC 总 is the battery's state of charge;

[0125] SOC min The state of charge of the lowest-charge cell in the battery;

[0126] SOC max It is the state of charge of the cell with the highest capacity in the battery.

[0127] Since the state of charge of each cell in the battery estimated by the state of charge cut-off method in the above embodiment of the present application is relatively accurate, the state of charge of the battery estimated based on the state of charge of the cell is also relatively accurate.

[0128] It should be noted that when setting the battery SOC 总 When the SOC of any cell in the battery is 0, the SOC 总 Set to 0.

[0129] like Figure 6 As shown, embodiments of the present application also provide a device for controlling state of charge cutoff, which includes units for implementing the method and steps for controlling state of charge cutoff of any of the above embodiments. For example, the device includes: a processing unit 301 and a setting unit 302. The processing unit 301 and the setting unit 302 can be directly or indirectly connected via electrical signals.

[0130] Among them, the processing unit 301 is used to obtain the net discharge capacity of the first battery cell from full charge to the current state; the battery includes at least a first type of battery cell and a second type of battery cell, the first type of battery cell and the second type of battery cell are battery cells with different capacities, and the first battery cell is any one of the first type of battery cell or the second type of battery cell.

[0131] The processing unit 301 is further configured to obtain the available capacity of the first battery cell and the state of health (SOH) of the first battery cell.

[0132] The processing unit 301 is further configured to obtain a current remaining dischargeable capacity of the first battery cell based on the nominal capacity of the battery, the net discharge capacity of the first battery cell, the available capacity of the first battery cell, and the SOH of the first battery cell.

[0133] The setting unit 302 is used to set the state of charge (SOC) of the first battery cell to 0 when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first battery cell is equal to the nominal capacity of the battery.

[0134] In some embodiments, the setting unit 302 is further used to set the SOC of the first battery cell to S1 when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, and the state of charge SOC of the first battery cell is less than the cut-off capacity S1; S1 is greater than 0.

[0135] In some embodiments, the processing unit 301 obtains the current remaining dischargeable capacity of the first battery cell according to the following formula:

[0136] C1=C0*SOH-(C0-C T )-C2,

[0137] Wherein, C1 is the current remaining discharge capacity of the first battery cell; C0 is the nominal capacity of the battery; C T is the available capacity of the first battery cell based on the current temperature; C2 is the net discharge capacity of the first battery cell; SOH is the current health status of the first battery cell, ranging from 0% to 100%.

[0138] In some embodiments, the nominal capacity of the battery is less than or equal to the initial capacity of the second battery cell; the second battery cell is the battery cell with the smallest initial capacity in the battery.

[0139] In some embodiments, the processing unit 301 obtains the net discharge capacity of the first battery cell from full charge to the current state, including:

[0140] The processing unit 301 determines whether the voltage of the third battery cell is less than the terminal voltage V2, the current of the third battery cell is less than the terminal current A2, and the SOC of the third battery cell is less than the terminal capacity S2. If so, the net discharge capacity of the first battery cell from full charge to the current is obtained; the third battery cell is any one of the first type battery cell or the second type battery cell.

[0141] In some embodiments, the processing unit 301 determines the battery state of charge (SOC) according to the following formula: 总 :

[0142] SOC 总 =SOC min / (1-SOC max +SOC min )*100%,

[0143] Among them, SOC 总 SOC is the state of charge of the battery; min The state of charge of the lowest-charge cell in the battery; SOC max It is the state of charge of the cell with the highest capacity in the battery.

[0144] The device for controlling the state of charge cutoff in the embodiment of the present application judges any first cell in a battery having two types of cells through a processing unit and a setting unit. When the sum of the current remaining discharge capacity of the first cell and the net discharge capacity of the first cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first cell is equal to the nominal capacity of the battery, the state of charge (SOC) of the first cell is set to 0, so that when the first cell discharges its nominal capacity, the SOC of the first cell is displayed as 0, and at this time the remaining discharge capacity of the first cell is greater than or equal to 0. Therefore, the SOC of the battery is obtained based on the SOC of the first cell. When the SOC of the battery is 0, the remaining discharge capacity of the battery is greater than or equal to 0, thereby reducing the probability of the power-consuming device shutting down before the battery displays the SOC as 0.

[0145] Regarding the device in the above embodiment, the specific manner in which each unit performs the operation has been described in detail in the embodiment of the method for cutting off the state of charge, and will not be elaborated here.

[0146] It should be understood that the division of units in the above device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, the units in the device can all be implemented in the form of software calling through processing elements; they can also all be implemented in the form of hardware; some units can also be implemented in the form of software calling through processing elements, and some units can be implemented in the form of hardware. For example, each unit can be a separately established processing element, or it can be integrated into a certain chip of the device. In addition, it can also be stored in the memory in the form of a program, called by a certain processing element of the device and execute the function of the unit. In addition, all or part of these units can be integrated together, or they can be implemented independently. The processing element here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each unit above can be implemented by the integrated logic circuit of the hardware in the processing element or in the form of software calling through the processing element.

[0147] like Figure 7 As shown, an embodiment of the present application also provides a system for controlling the state of charge cut-off, which includes: a memory 401, a processor 402, and an interface 403. The memory 401, the processor 402, and the interface 403 are connected via a bus 404, and the bus 404 can be implemented by a connecting circuit. Among them, the memory 401 is used to store a program, and when the program is called by the processor 402, it can implement the method executed by the device for controlling the state of charge cut-off in the above embodiment. The interface 403 is used to realize communication with a charging device or other external system, and the interface 403 can communicate with the charging device or other external system via a wired connection or a wireless connection.

[0148] The functions of each unit in the above-mentioned device for controlling the state of charge cutoff can be implemented by the processor 402 calling the program stored in the memory 401. That is, the above-mentioned device for controlling the state of charge cutoff includes a processor 402 and a memory 401. The memory 401 is used to store the program, and the program is called by the processor 402 to execute the method in the above-mentioned method embodiment. The processor 402 here can be a general-purpose processor or other processor that can call a program; or the processor 402 can be configured to implement one or more integrated circuits that implement the method of the device for controlling the state of charge cutoff in the above-mentioned embodiment, such as one or more application-specific integrated circuits (ASICs), one or more microprocessors (DSPs), one or more field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. For another example, when the units in the apparatus for controlling the state of charge cutoff can be implemented by scheduling a program on processor 402, processor 402 can be a general-purpose processor, such as a central processing unit (CPU), a controller, a microcontroller, a single-chip microcomputer, or other processor capable of calling programs. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0149] There is no limit to the number of memories 401 , which can be one or more.

[0150] The memory 401 includes at least one type of readable storage medium, and the readable storage medium includes non-volatile memory (Non-volatile Memory) or volatile memory, such as flash memory, hard disk, multimedia card, card-type memory (such as SD or DX memory), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic storage, magnetic disk or optical disk, etc. RAM may include static RAM or dynamic RAM. In some embodiments, the memory 401 may be the internal memory of the device, such as the hard disk or memory of the device. In other embodiments, the memory 401 may also be an external storage device of the device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, or a Flash Card (FC) equipped on the device. Of course, the memory 401 may also include both the internal memory of the device and its external storage device. In this embodiment, the memory 401 is generally used to store the operating system and various application software installed on the device, such as the program code of the method for controlling the state of charge cutoff. In addition, the memory 401 may also be used to temporarily store various types of data that have been output or are about to be output.

[0151] Bus 404 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Bus 404 may include an address bus, a data bus, or a control bus. For ease of illustration, the figure shows only one thick line, but this does not mean that there is only one bus or only one type of bus.

[0152] Processor 402 is generally used to control the overall operation of the system. In this embodiment, memory 401 is used to store program code or instructions, including computer operating instructions. Processor 402 is used to execute the program code or instructions stored in memory 401 or process data, such as program code for executing a method for controlling the state of charge cutoff.

[0153] Finally, embodiments of the present application further provide a computer-readable storage medium storing a computer program. When the computer program is executed on a computer, the computer executes the state-of-charge termination method of the aforementioned embodiment. The computer-readable storage medium has been described in detail in the aforementioned embodiment of the system for controlling state-of-charge termination and will not be further elaborated here.

[0154] In summary, the present application is an embodiment that judges any first cell in a battery having two types of cells. When the sum of the current remaining discharge capacity of the first cell and the net discharge capacity of the first cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first cell is equal to the nominal capacity of the battery, the state of charge (SOC) of the first cell is set to 0, so that when the first cell discharges its nominal capacity, the SOC of the first cell is displayed as 0, and at this time the remaining discharge capacity of the first cell is greater than or equal to 0. Therefore, the SOC of the battery is obtained based on the SOC of the first cell. When the SOC of the battery is 0, the remaining discharge capacity of the battery is greater than or equal to 0, thereby reducing the probability of the electrical device shutting down before the battery displays the SOC as 0.

[0155] Those skilled in the art will appreciate that the combination of features of different embodiments is intended to be within the scope of this application and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0156] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining state of charge, characterized in that: The method comprises: During a battery discharge process, obtaining a net discharge capacity of a first battery cell from full charge to a current value; the battery includes at least a first type of battery cell and a second type of battery cell, the first type of battery cell and the second type of battery cell are battery cells made of different positive electrode materials, and the first battery cell is any one of the first type of battery cell and the second type of battery cell; Obtaining the available capacity of the first battery cell and the state of health (SOH) of the first battery cell; Obtaining a current remaining discharge capacity of the first battery cell based on the nominal capacity of the battery, the net discharge capacity of the first battery cell, the available capacity of the first battery cell, and the SOH of the first battery cell; The current remaining discharge capacity of the first battery cell is obtained according to the following formula: C1=C0*SOH-(C0-C T )-C2, Wherein, C1 is the current remaining discharge capacity of the first battery cell; C0 is the nominal capacity of the battery; C T The available capacity of the first battery cell based on the current temperature; C2 is the net discharge capacity of the first battery cell; SOH is the current health status SOH of the first battery cell, ranging from 0% to 100%; When the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first battery cell is equal to the nominal capacity of the battery, the state of charge SOC of the first battery cell is set to 0.

2. The method for determining the state of charge according to claim 1, wherein: The method further includes: when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, and the SOC of the first battery cell is less than the cutoff capacity S1, setting the SOC of the first battery cell to S1; and S1 is greater than 0.

3. The method for determining the state of charge according to claim 2, wherein: The method also includes: when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, the voltage of the first battery cell is lower than the cut-off voltage V1, and the current of the first battery cell is less than the cut-off current A1, setting the SOC of the first battery cell to 0.

4. The method for determining the state of charge according to any one of claims 1 to 3, wherein: The nominal capacity of the battery is less than or equal to the available capacity of the second battery cell in the initial state; the second battery cell is the battery cell with the smallest available capacity in the initial state.

5. The method for determining the state of charge according to claim 1, wherein: Obtaining the net discharge capacity of the first battery cell from full charge to the current state further includes: Determine whether there is a third battery cell whose voltage is less than the terminal voltage V2, and the current of the third battery cell is less than the terminal current A2, and the SOC of the third battery cell is less than the terminal capacity S2. If so, obtain the net discharge capacity of the first battery cell from full charge to the current; the third battery cell is any one of the first type battery cell or the second type battery cell.

6. The method for determining the state of charge according to claim 1, wherein: The method further includes: determining the battery state of charge (SOC) according to the following formula: 总 : SOCIETY 总 =SOC min / (1-SOC max +SOC min )*100%, Among them, SOC 总 is the state of charge of the battery; SOC min The state of charge of the cell with the lowest charge in the battery; SOC max The state of charge of the cell with the highest charge in the battery.

7. A device for controlling the state of charge cutoff, characterized in that: include: Processing unit: during the battery discharging process, used to obtain the net discharge capacity of the first battery cell from full charge to the current state; The battery includes at least a first type of battery cell and a second type of battery cell, the first type of battery cell and the second type of battery cell are battery cells with different capacities, and the first battery cell is any one of the first type of battery cell or the second type of battery cell; and Used to obtain the available capacity of the first battery cell and the health state SOH of the first battery cell; and Used to obtain the current remaining discharge capacity of the first battery cell based on the nominal capacity of the battery, the net discharge capacity of the first battery cell, the available capacity of the first battery cell and the SOH of the first battery cell; The processing unit obtains the current remaining dischargeable capacity of the first battery cell according to the following formula: C1=C0*SOH-(C0-C T )-C2, Wherein, C1 is the current remaining discharge capacity of the first battery cell; C0 is the nominal capacity of the battery; C T The available capacity of the first battery cell based on the current temperature; C2 is the net discharge capacity of the first battery cell; SOH is the current health status of the first battery cell, ranging from 0% to 100%; Setting unit: used to set the state of charge SOC of the first battery cell to 0 when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is greater than or equal to the nominal capacity of the battery, and the net discharge capacity of the first battery cell is equal to the nominal capacity of the battery.

8. The device for controlling the state of charge cutoff according to claim 7, characterized in that: The setting unit is further used to: when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, and the state of charge SOC of the first battery cell is less than the cut-off capacity S1, set the SOC of the first battery cell to S1; and S1 is greater than 0.

9. The device for controlling the state of charge cutoff according to claim 8, characterized in that: The setting unit is also used to set the state of charge SOC of the first battery cell to 0 when the sum of the current remaining discharge capacity of the first battery cell and the net discharge capacity of the first battery cell is less than the nominal capacity, the voltage of the first battery cell is lower than the cut-off voltage V1, and the current of the first battery cell is less than the cut-off current A1.

10. The device for controlling the state of charge cutoff according to any one of claims 7 to 9, characterized in that: The nominal capacity of the battery is less than or equal to the available capacity of the second battery cell in the initial state; the second battery cell is the battery cell with the smallest available capacity in the initial state in the battery.

11. The device for controlling the state of charge cutoff according to claim 7, characterized in that: The processing unit obtaining the net discharge capacity of the first battery cell from full charge to the current state includes: The processing unit determines whether there is a third battery cell whose voltage is less than the terminal voltage V2, and the current of the third battery cell is less than the terminal current A2, and the SOC of the third battery cell is less than the terminal capacity S2. If so, the net discharge capacity of the first battery cell from full charge to the current is obtained; the third battery cell is any one of the first type of battery cell or the second type of battery cell.

12. The device for controlling the state of charge cutoff according to claim 7, characterized in that: The processing unit is further configured to determine the state of charge (SOC) of the battery according to the following formula: 总 : SOCIETY 总 =SOC min / (1-SOC max +SOC min )*100%, Among them, SOC 总 is the state of charge of the battery; SOC min The state of charge of the cell with the lowest charge in the battery; SOC max The state of charge of the cell with the highest charge in the battery.

13. A system for controlling state of charge cut-off, characterized in that: comprising a memory, a processor and a bus, wherein the memory and the processor communicate with each other via the bus; The memory is used to store executable program code; The processor is configured to read the executable program code stored in the memory to execute the state of charge cut-off method according to any one of claims 1 to 6.

14. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed on a computer, the computer is enabled to execute the state-of-charge termination method according to any one of claims 1 to 6.

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