Method and device for judging depolarization state of battery, electronic equipment and storage medium

Abstract

The application provides a battery depolarization state judgment method and device, electronic equipment and storage medium. The method comprises: in the case that the duration of the battery entering the forced depolarization state satisfies a first duration threshold, obtaining the maximum battery cell state of charge (SOC) value, the minimum battery cell voltage, the battery SOC value and the battery temperature at the current time; obtaining the battery cell open circuit voltage (OCV) value at the current time based on the maximum battery cell SOC value at the current time and a preset voltage charge mapping relationship; obtaining the voltage recovery degree threshold at the current time based on the battery SOC value at the current time and the battery temperature; and judging the depolarization state of the battery according to the battery cell OCV value at the current time, the voltage recovery degree threshold and the minimum battery cell voltage. The voltage recovery degree is introduced as a new judgment condition, the voltage recovery degree threshold represents the actual depolarization degree of the battery, the judgment method is more reasonable, the risk of battery under-voltage is reduced, and the power performance of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a method, apparatus, electronic device and storage medium for determining the depolarization state of a battery. Background Technology

[0002] To prevent undervoltage during battery discharge, the discharge control strategy in the battery management system needs to determine the current polarization level of the battery to ascertain the current allowable discharge power of the battery system. Only when the battery management system determines that the battery is in a fully depolarized state can the battery system discharge at its calibrated maximum capacity.

[0003] In the current discharge control strategy, the standard for judging that the battery is in a completely depolarized state is that the actual output power of the battery system is less than or equal to the pre-calibrated continuous discharge allowable power (the discharge power that can be discharged continuously for 5 minutes without undervoltage) and continues for a fixed duration (generally set to 5 to 10 seconds).

[0004] The standard for determining whether the battery is in a completely depolarized state in this discharge control strategy mainly refers to engineering experience and does not take into account the actual polarization state of the battery under actual operating conditions. The battery system still has a certain risk of undervoltage and affects the overall performance of the battery system. Summary of the Invention

[0005] This application provides a method, apparatus, electronic device, and storage medium for determining the depolarization state of a battery, thereby reducing the risk of undervoltage and improving the battery's power performance. The technical solution of this application is as follows:

[0006] In a first aspect, embodiments of this application provide a method for determining the depolarization state of a battery, including:

[0007] If the duration of the battery entering the forced depolarization state meets the first duration threshold, the highest state of charge (SOC) value of the cell, the lowest cell voltage, the battery SOC value, and the battery temperature at the current moment are obtained.

[0008] Based on the current cell's highest SOC value and the preset voltage-charge mapping relationship, the cell's open-circuit voltage OCV value at the current moment is obtained.

[0009] Based on the current battery SOC value and battery temperature, a preset voltage recovery threshold library is queried to obtain the voltage recovery threshold for the current moment; wherein, the preset voltage recovery threshold library includes voltage recovery thresholds corresponding to different battery SOC ranges and different battery temperature ranges;

[0010] The depolarization state of the battery is determined based on the current cell OCV value, voltage recovery threshold, and minimum cell voltage.

[0011] Secondly, embodiments of this application provide a device for determining the depolarization state of a battery, comprising:

[0012] The data acquisition module is used to acquire the highest state of charge (SOC) value, lowest cell voltage, battery SOC value, and battery temperature at the current moment when the duration of the battery entering the forced depolarization state meets the first duration threshold.

[0013] The open-circuit voltage acquisition module is used to obtain the cell open-circuit voltage (OCV) value at the current moment based on the cell's highest SOC value at the current moment and a preset voltage-charge mapping relationship.

[0014] The voltage recovery threshold acquisition module is used to query a preset voltage recovery threshold library based on the current battery SOC value and battery temperature to obtain the voltage recovery threshold for the current time; wherein, the preset voltage recovery threshold library includes voltage recovery thresholds corresponding to different battery SOC ranges and different battery temperature ranges;

[0015] The polarization state identification module is used to determine the depolarization state of the battery based on the cell OCV value, voltage recovery threshold, and minimum cell voltage at the current moment.

[0016] Thirdly, embodiments of this application provide an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the battery depolarization state determination method described in the first aspect of this application.

[0017] Fourthly, embodiments of this application provide a non-transitory computer-readable storage medium storing computer instructions, the computer instructions being used to cause the computer to execute the battery depolarization state determination method described in the first aspect of this application.

[0018] Fifthly, embodiments of this application provide a computer program product, including computer instructions, which, when executed by a processor, implement the steps of the battery depolarization state determination method described in the first aspect of this application.

[0019] The technical solution provided in this application has at least the following beneficial effects:

[0020] In identifying the complete depolarization state of a battery, the degree of voltage recovery is introduced as a new judgment condition. The threshold of the degree of voltage recovery characterizes the actual degree of depolarization of the battery, making the judgment method more reasonable, which helps to reduce the risk of undervoltage of the battery and improve the power performance of the battery.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0023] Figure 1 This is a flowchart illustrating a method for determining the depolarization state of a battery according to an exemplary embodiment.

[0024] Figure 2 This is a flowchart illustrating a method for determining the depolarization state of a battery according to a specific embodiment.

[0025] Figure 3 This is a block diagram illustrating a battery depolarization state determination device according to an exemplary embodiment.

[0026] Figure 4 This is a block diagram illustrating an electronic device according to an exemplary embodiment. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0028] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0029] Battery polarization is the phenomenon where the potential of a battery deviates from its equilibrium potential when current flows through it.

[0030] A depolarizing electrode is an electrode whose electrode potential remains constant during electrolysis and remains unchanged during electrochemical measurements.

[0031] SOC (State of charge) is used to reflect the remaining capacity of a battery. It is numerically defined as the ratio of the remaining capacity to the battery's total capacity, and is usually expressed as a percentage.

[0032] OCV (Open Circuit Voltage) is the voltage at which a circuit is open.

[0033] Analysis revealed that in actual user operating conditions, on the one hand, if the battery has a high degree of accumulated polarization in the early stages, even if the current battery management system's criteria for complete depolarization are met, undervoltage may still occur during subsequent high-power discharge. On the other hand, if the battery has a low degree of accumulated polarization in the early stages, the corresponding depolarization time can be less than the aforementioned fixed time (generally set to 5 to 10 seconds). In this case, the current discharge control strategy will limit the performance of the battery system.

[0034] To address the aforementioned issues, embodiments of this application propose a method, apparatus, electronic device, and storage medium for determining the depolarization state of a battery.

[0035] Figure 1 This is a flowchart of a method for determining the battery depolarization state according to an embodiment of this application. It should be noted that the method for determining the battery depolarization state of this application can be applied to the battery depolarization state determination device of this application. This battery depolarization state determination device can be configured on electronic devices such as vehicle controllers. Figure 1 As shown, the method for determining the depolarization state of the battery may include the following steps.

[0036] In step S101, if the duration of the battery entering the forced depolarization state meets the first duration threshold, the highest state of charge (SOC) value of the cell, the lowest cell voltage, the battery SOC value, and the battery temperature at the current moment are obtained.

[0037] It should be noted that the forced depolarization state limits the maximum allowable discharge power of the battery. As an example, the maximum allowable discharge power is limited to a pre-calibrated continuous discharge allowable power.

[0038] The battery management system controls the battery to enter a forced depolarization state when certain conditions are met. In this embodiment, the condition is that the battery enters the forced depolarization state when the actual power exceeds the continuous discharge power for a cumulative period of time. As an example, the battery enters the forced depolarization state when the actual power exceeds the continuous discharge power for a cumulative period of 26 seconds.

[0039] As an example, the first duration threshold can be 2 seconds, that is, the duration of entering the forced depolarization state is greater than or equal to the first duration threshold (2 seconds). If this condition is met, the subsequent judgment continues.

[0040] This can be understood as follows: the method for determining the battery depolarization state requires two criteria to identify whether the battery is fully depolarized. The first criterion is whether the duration of the battery's forced depolarization state meets a certain condition. If the first criterion is met, the second criterion is then checked. If the second criterion is also met, the battery is considered to be fully depolarized. The data used for the second criterion include the current cell's highest state of charge (SOC), lowest cell voltage, battery SOC, and battery temperature.

[0041] The methods for obtaining the current cell's highest SOC value include:

[0042] Obtain the SOC value of all cells in the battery at the current moment; obtain the maximum SOC value among all cells, and use the maximum value as the cell OCV value at the current moment.

[0043] In step S102, the cell open-circuit voltage (OCV) value at the current moment is obtained based on the cell's highest SOC value at the current moment and the preset voltage-charge mapping relationship.

[0044] The cell terminal voltage can be obtained in real time through measurement, while the cell open-circuit voltage cannot be directly measured but can be obtained from calibration data. In this embodiment, a preset voltage-charge mapping relationship is obtained in advance, that is, the mapping relationship between the cell open-circuit voltage value and the cell state of charge value, to obtain the cell open-circuit voltage OCV value at the current moment.

[0045] In step S103, based on the current battery SOC value and battery temperature, a preset voltage recovery threshold library is queried to obtain the voltage recovery threshold for the current time; wherein, the preset voltage recovery threshold library includes voltage recovery thresholds corresponding to different battery SOC ranges and different battery temperature ranges.

[0046] It should be noted that the voltage recovery threshold in the embodiments of this application represents the actual depolarization state of the battery.

[0047] In other words, based on the current battery temperature and battery SOC value, the corresponding voltage recovery threshold is queried from the preset voltage recovery threshold library.

[0048] In step S104, the depolarization state of the battery is determined based on the current cell OCV value, voltage recovery threshold, and minimum cell voltage.

[0049] The second criterion is to determine the battery's depolarization state based on the current cell OCV value, voltage recovery threshold, and lowest cell voltage. If this criterion is met, it can be confirmed that the battery has been completely depolarized.

[0050] The battery depolarization state determination method in this application introduces voltage recovery degree as a new determination condition, whereby the voltage recovery degree threshold characterizes the actual degree of battery depolarization. During the actual depolarization process, the actual degree of battery depolarization is determined in real time, making the determination method more reasonable. Therefore, the battery management system can select a more suitable discharge control strategy based on whether the battery is fully depolarized, helping to reduce the risk of undervoltage and improve the battery's power performance.

[0051] Figure 2 This is a flowchart of a method for determining the depolarization state of a battery according to a specific embodiment of this application. Figure 2 As shown, the method for determining the depolarization state of the battery may include the following steps.

[0052] In step S201, if the duration of the battery entering the forced depolarization state meets the first duration threshold, the highest state of charge (SOC) value of the cell, the lowest cell voltage, the battery SOC value, and the battery temperature at the current moment are obtained.

[0053] It should be noted that, in the embodiments of this application, the implementation process of step S201 can be referred to the description of the implementation process of step S101 above, and will not be repeated here.

[0054] In step S202, the cell open-circuit voltage (OCV) value at the current moment is obtained based on the cell's highest SOC value at the current moment and the preset voltage-charge mapping relationship.

[0055] Based on the above embodiments, as a possible implementation, the cell's OCV value at the current moment can be obtained by querying the open-circuit voltage-charge state curve (i.e., the OCV-SOC curve) according to the cell's highest SOC value.

[0056] In other words, the highest SOC value (SOCmax) among the multiple cells of the battery at the current moment is read, and the cell open-circuit voltage (OCV) value is obtained by querying the OCV-SOC curve based on SOCmax.

[0057] In step S203, based on the current battery SOC value and battery temperature, a preset voltage recovery threshold library is queried to obtain the current voltage recovery threshold; wherein, the preset voltage recovery threshold library includes voltage recovery thresholds corresponding to different battery SOC ranges and different battery temperature ranges.

[0058] In other words, the method for obtaining the voltage recovery threshold at the current moment includes: obtaining the battery SOC value and battery temperature at the current moment; and querying a preset voltage recovery threshold library based on the battery SOC value and battery temperature at the current moment to obtain the voltage recovery threshold at the current moment. That is, based on the battery temperature and battery SOC value at the current moment, the corresponding voltage recovery threshold is retrieved from the preset voltage recovery threshold library.

[0059] Optionally, methods for constructing a library of preset voltage recovery thresholds include:

[0060] Acquire information on multiple vehicles that have undergone forced depolarization within the second time threshold range before the undervoltage occurred. Each vehicle information includes the battery SOC value at the time of undervoltage, battery temperature, minimum cell terminal voltage at the time of the end of the forced depolarization state, and cell OCV value.

[0061] Based on multiple vehicle information, multiple cell voltage recovery ratio values ​​Q are obtained in multiple two-dimensional intervals; where the cell voltage recovery ratio value Q is the ratio of the minimum cell terminal voltage at the end of the forced depolarization state to the cell OCV value, and the multiple two-dimensional intervals are composed of multiple battery temperature intervals and multiple battery SOC intervals.

[0062] For each of the multiple two-dimensional intervals, the largest of the multiple cell voltage recovery ratio values ​​Q in that two-dimensional interval is taken as the voltage recovery degree threshold of that two-dimensional interval.

[0063] As an example, the second duration threshold can be 90 seconds. The cloud big data is used to statistically analyze the information of all vehicles that experienced undervoltage and underwent a forced depolarization process 90 seconds before the undervoltage. The vehicle information includes the battery SOC and battery temperature at the time of undervoltage, the minimum cell terminal voltage (Vmin) and cell OCV value (OCV) at the last moment of the forced depolarization process, and calculates the cell voltage recovery ratio Q at this time, Q = Vmin / OCV.

[0064] The Q-value distribution of different undervoltage battery temperature ranges (each range is 10℃) and different undervoltage SOC ranges (each SOC range is 10% SOC) is statistically analyzed. The maximum Q-value of each range is selected as the battery temperature and battery SOC range to determine the voltage recovery threshold of the battery's complete depolarization.

[0065] As one implementation method, a two-dimensional table is established with different undervoltage battery temperature ranges in the horizontal direction and different undervoltage SOC ranges in the vertical direction. Based on the statistical Q values, the maximum Q value of each two-dimensional range is determined as the voltage recovery threshold of that range.

[0066] This application's embodiments determine voltage recovery thresholds for different SOC ranges and battery temperature ranges based on historical data from the cloud. Through analysis of a large amount of actual data, these thresholds are obtained, ensuring high data reliability. Furthermore, the voltage recovery thresholds can be continuously updated as historical data accumulates.

[0067] This can be understood as follows: when constructing the preset voltage recovery threshold library, since the voltage recovery level of all undervoltage vehicles counted does not exceed the voltage recovery threshold, in other words, vehicles with voltage recovery levels exceeding the voltage recovery threshold have not experienced undervoltage again.

[0068] In step S204, the product of the cell OCV value at the current moment and the voltage recovery threshold is calculated.

[0069] It should be noted that the second criterion for determining the depolarization state of a battery is that the current lowest cell voltage is greater than or equal to the cell open-circuit voltage (OCV) multiplied by the voltage recovery threshold. Therefore, it is necessary to first calculate the product of the current cell OCV value and the voltage recovery threshold.

[0070] In step S205, when the lowest cell voltage at the current moment is greater than or equal to the product, the battery depolarization state is confirmed to be a fully depolarized state.

[0071] It should be noted that the terminal voltage of a battery cell is the most direct reflection of its polarization degree. When the terminal voltage of a battery cell is equal to its open-circuit voltage, the cell can be considered to be in a completely depolarized state. In other words, when the ratio of the terminal voltage to the open-circuit voltage is 1, it indicates that the cell is in a completely depolarized state.

[0072] It should also be noted that the minimum cell voltage in the embodiments of this application refers to the terminal voltage of the cell.

[0073] In other words, it is determined whether the lowest cell voltage at the current moment is greater than or equal to the value of cell open circuit voltage (OCV) × voltage recovery threshold. If the lowest cell voltage at the current moment is greater than or equal to the product of cell open circuit voltage (OCV) and voltage recovery threshold, then the battery is identified as having been completely depolarized and is in a completely depolarized state.

[0074] The battery depolarization state determination method in this application determines whether the battery has been fully depolarized when the duration of the battery entering the forced depolarization state meets the required conditions. This is based on whether the product of the current minimum cell voltage, the cell OCV value, and the voltage recovery threshold satisfies the given condition. By introducing voltage recovery as a new condition into the battery depolarization state determination criteria, the voltage recovery threshold characterizes the actual degree of battery depolarization. During the actual depolarization process, the actual degree of battery depolarization is determined in real time, making the determination method more reasonable. Therefore, the battery management system can select a more suitable discharge control strategy based on whether the battery is fully depolarized, helping to reduce the risk of undervoltage and improve the battery's power performance.

[0075] Figure 3 This is a block diagram illustrating a battery depolarization state determination device according to an exemplary embodiment. (Refer to...) Figure 3 The device for determining the depolarization state of the battery may include: a determination data acquisition module 301, an open-circuit voltage acquisition module 302, a voltage recovery threshold acquisition module 303, and a polarization state identification module 304.

[0076] Specifically, the data acquisition module 301 is used to acquire the highest state of charge (SOC) value, lowest cell voltage, battery SOC value, and battery temperature at the current moment when the duration of the battery entering the forced depolarization state meets the first duration threshold.

[0077] The open-circuit voltage acquisition module 302 is used to obtain the cell open-circuit voltage OCV value at the current moment based on the cell's highest SOC value at the current moment and a preset voltage-charge mapping relationship.

[0078] The voltage recovery threshold acquisition module 303 is used to query a preset voltage recovery threshold library based on the current battery SOC value and battery temperature to obtain the voltage recovery threshold at the current time; wherein, the preset voltage recovery threshold library includes voltage recovery thresholds corresponding to different battery SOC ranges and different battery temperature ranges.

[0079] The polarization state identification module 304 is used to determine the depolarization state of the battery based on the cell OCV value, voltage recovery threshold, and minimum cell voltage at the current moment.

[0080] In some embodiments of this application, the polarization state identification module 304 is specifically used for:

[0081] Calculate the product of the cell's current OCV value and the voltage recovery threshold.

[0082] The depolarization state of the battery is determined by whether the product of the current lowest cell voltage and the current cell voltage satisfies the second preset relationship.

[0083] In some embodiments of this application, when the polarization state identification module 304 determines the depolarization state of the battery based on whether the product of the current lowest cell voltage and the voltage satisfies a second preset relationship, it is used to:

[0084] When the lowest cell voltage at the current moment is greater than or equal to the product, the depolarization state of the battery is confirmed to be a fully depolarized state.

[0085] In some embodiments of this application, the apparatus further includes a voltage recovery level threshold library construction module 305, used for:

[0086] Acquire information on multiple vehicles that have undergone a forced depolarization process within the second time threshold range before the undervoltage occurs. Each vehicle information includes the battery SOC value at the time of undervoltage, battery temperature, minimum cell terminal voltage at the time of the end of the forced depolarization state, and cell OCV value.

[0087] Based on multiple vehicle information, multiple cell voltage recovery ratio values ​​Q are obtained in multiple two-dimensional intervals; where the cell voltage recovery ratio value Q is the ratio of the minimum cell terminal voltage at the end of the forced depolarization state to the cell OCV value, and the multiple two-dimensional intervals are composed of multiple battery temperature intervals and multiple battery SOC intervals.

[0088] For each of the multiple two-dimensional intervals, the largest of the multiple cell voltage recovery ratio values ​​Q in that two-dimensional interval is taken as the voltage recovery degree threshold of that two-dimensional interval.

[0089] In some embodiments of this application, the open-circuit voltage acquisition module 302 is used for:

[0090] Based on the highest SOC value of the cell, the open-circuit voltage and charge state curve is queried to obtain the cell OCV value at the current moment.

[0091] In some embodiments of this application, the data acquisition module 301 determines the cell's highest state of charge (SOC) value at the current moment, for the following purposes:

[0092] Obtain the current SOC value of all cells in the battery at the current moment;

[0093] Obtain the largest SOC value among all the cells and use the largest value as the cell OCV value at the current moment.

[0094] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0095] The battery depolarization state determination device in this application introduces voltage recovery degree as a new determination condition into the battery depolarization state determination criteria. The voltage recovery degree threshold characterizes the actual depolarization degree of the battery. During the actual depolarization process, the actual depolarization degree of the battery is determined in real time, making the determination method more reasonable. Therefore, the battery management system can select a more suitable discharge control strategy based on whether the battery is fully depolarized, which helps reduce the risk of undervoltage and improve the battery's power performance.

[0096] According to embodiments of this application, this application also provides an electronic device and a readable storage medium.

[0097] like Figure 4 The diagram shown is a block diagram of an electronic device for determining a battery depolarization state according to an embodiment of this application. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present application described and / or claimed herein.

[0098] like Figure 4 As shown, the electronic device includes one or more processors 401, a memory 402, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components are interconnected via different buses and can be mounted on a common motherboard or otherwise as required. The processors can process instructions executed within the electronic device, including instructions stored in or on memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In other embodiments, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple electronic devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 4 Take a processor 401 as an example.

[0099] The memory 402 is the non-transitory computer-readable storage medium provided in this application. The memory stores instructions executable by at least one processor to cause the at least one processor to perform the method for determining the battery depolarization state provided in this application. The non-transitory computer-readable storage medium of this application stores computer instructions for causing a computer to perform the method for determining the battery depolarization state provided in this application.

[0100] Memory 402, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the method for determining the battery depolarization state in the embodiments of this application (e.g., attached). Figure 3 The diagram shows a judgment data acquisition module 301, an open-circuit voltage acquisition module 302, a voltage recovery threshold acquisition module 303, and a polarization state identification module 304. The processor 401 executes various server functions and data processing by running non-transient software programs, instructions, and modules stored in the memory 402, thereby implementing the method for determining the battery depolarization state in the above method embodiments.

[0101] Memory 402 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the use of the electronic device based on the determination of the battery depolarization state. Furthermore, memory 402 may include high-speed random access memory and may also include non-transient memory, such as at least one disk storage device, flash memory device, or other non-transient solid-state storage device. In some embodiments, memory 402 may optionally include memory remotely located relative to processor 401, and these remote memories can be connected to the electronic device determining the battery depolarization state via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0102] The electronic device for determining the battery depolarization state may further include an input device 403 and an output device 404. The processor 401, memory 402, input device 403, and output device 404 can be connected via a bus or other means. Figure 4 Taking the example of a connection between China and Israel via a bus.

[0103] Input device 403 can receive input digital or character information, as well as key signal input related to user settings and function control of electronic devices that generate judgments about battery depolarization state, such as touch screens, keypads, mice, trackpads, touchpads, joysticks, one or more mouse buttons, trackballs, joysticks, etc. Output device 404 may include display devices, auxiliary lighting devices (e.g., LEDs), and haptic feedback devices (e.g., vibration motors). The display device may include, but is not limited to, liquid crystal displays (LCDs), light-emitting diode (LED) displays, and plasma displays. In some embodiments, the display device may be a touch screen.

[0104] Various implementations of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, application-specific integrated circuits (ASICs), computer hardware, firmware, software, and / or combinations thereof. These various implementations may include: implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transferring data and instructions to the storage system, the at least one input device, and the at least one output device.

[0105] These computational programs (also referred to as programs, software, software applications, or code) include machine instructions for a programmable processor and can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. As used herein, the terms “machine-readable medium” and “computer-readable medium” refer to any computer program product, device, and / or apparatus (e.g., disk, optical disk, memory, programmable logic device (PLD)) used to provide machine instructions and / or data to a programmable processor, including machine-readable media that receive machine instructions as machine-readable signals. The term “machine-readable signal” refers to any signal used to provide machine instructions and / or data to a programmable processor.

[0106] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0107] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with embodiments of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0108] Computer systems can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other.

[0109] In an exemplary embodiment, a computer program product is also provided, which, when executed by a processor of an electronic device, enables the electronic device to perform the above-described method.

[0110] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0111] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0112] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for determining the depolarization state of a battery, characterized in that, include: If the duration of the battery entering the forced depolarization state meets the first duration threshold, the highest state of charge (SOC) value of the cell, the lowest cell voltage, the battery SOC value, and the battery temperature at the current moment are obtained. Based on the current cell's highest SOC value and the preset voltage-charge mapping relationship, the cell's open-circuit voltage OCV value at the current moment is obtained. Based on the current battery SOC value and battery temperature, a preset voltage recovery threshold library is queried to obtain the voltage recovery threshold for the current moment; wherein, the preset voltage recovery threshold library includes voltage recovery thresholds corresponding to different battery SOC ranges and different battery temperature ranges, and the construction method includes: Acquire information on multiple vehicles that have undergone a forced depolarization process within a second time threshold range before the undervoltage occurs. Each vehicle information includes the battery SOC value at the time of undervoltage, battery temperature, minimum cell terminal voltage at the time of the end of the forced depolarization state, and cell OCV value. Based on the multiple vehicle information, multiple cell voltage recovery ratio values ​​Q in multiple two-dimensional intervals are obtained; wherein, the cell voltage recovery ratio value Q is the ratio of the minimum cell terminal voltage at the end of the forced depolarization state to the cell OCV value, and the multiple two-dimensional intervals are composed of multiple battery temperature intervals and multiple battery SOC intervals. For each of the plurality of two-dimensional intervals, the largest of the plurality of cell voltage recovery ratio values ​​Q in that two-dimensional interval is taken as the voltage recovery degree threshold of that two-dimensional interval. The depolarization state of the battery is determined based on the current cell OCV value, voltage recovery threshold, and minimum cell voltage.

2. The method according to claim 1, characterized in that, The step of determining the depolarization state of the battery based on the current cell OCV value, voltage recovery threshold, and minimum cell voltage includes: Calculate the product of the cell OCV value at the current moment and the voltage recovery threshold; The depolarization state of the battery is determined based on whether the product of the current minimum cell voltage and the current cell voltage satisfies a second preset relationship.

3. The method according to claim 2, characterized in that, The step of determining the depolarization state of the battery based on whether the product of the current lowest cell voltage and the current cell voltage satisfies a second preset relationship includes: When the lowest cell voltage at the current moment is greater than or equal to the product, the depolarization state of the battery is confirmed to be a fully depolarized state.

4. The method according to claim 1, characterized in that, The preset voltage-charge mapping relationship is an open-circuit voltage versus charge state curve. Obtaining the current cell OCV value based on the cell's highest SOC value and the preset voltage-charge mapping relationship includes: Based on the highest SOC value of the battery cell, the open-circuit voltage and charge state curve is queried to obtain the current OCV value of the battery cell.

5. The method according to claim 1, characterized in that, The method for obtaining the highest SOC value of the battery cell at the current moment includes: Obtain the current SOC value of all cells in the battery at the current moment; The highest SOC value among all the cells is taken as the highest SOC value of the cell at the current moment.

6. A device for determining the depolarization state of a battery, characterized in that, include: The data acquisition module is used to acquire the highest state of charge (SOC) value, lowest cell voltage, battery SOC value, and battery temperature at the current moment when the duration of the battery entering the forced depolarization state meets the first duration threshold. The open-circuit voltage acquisition module is used to obtain the cell open-circuit voltage (OCV) value at the current moment based on the cell's highest SOC value at the current moment and a preset voltage-charge mapping relationship. The voltage recovery threshold acquisition module is used to query a preset voltage recovery threshold library based on the current battery SOC value and battery temperature to obtain the voltage recovery threshold for the current moment; wherein, the preset voltage recovery threshold library includes voltage recovery thresholds corresponding to different battery SOC ranges and different battery temperature ranges, and the construction method includes: Acquire information on multiple vehicles that have undergone a forced depolarization process within a second time threshold range before the undervoltage occurs. Each vehicle information includes the battery SOC value at the time of undervoltage, battery temperature, minimum cell terminal voltage at the time of the end of the forced depolarization state, and cell OCV value. Based on the multiple vehicle information, multiple cell voltage recovery ratio values ​​Q in multiple two-dimensional intervals are obtained; wherein, the cell voltage recovery ratio value Q is the ratio of the minimum cell terminal voltage at the end of the forced depolarization state to the cell OCV value, and the multiple two-dimensional intervals are composed of multiple battery temperature intervals and multiple battery SOC intervals. For each of the plurality of two-dimensional intervals, the largest of the plurality of cell voltage recovery ratio values ​​Q in that two-dimensional interval is taken as the voltage recovery degree threshold of that two-dimensional interval. The polarization state identification module is used to determine the depolarization state of the battery based on the cell OCV value, voltage recovery threshold, and minimum cell voltage at the current moment.

7. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the battery depolarization state determination method according to any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to execute the method for determining the battery depolarization state according to any one of claims 1 to 5.

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