Battery management method and system, terminal, and computer readable storage medium

Abstract

The present application discloses a battery management method and system, a terminal, and a computer readable storage medium. The battery management method comprises: acquiring information of states of a battery cell; and in response to the battery cell being in a storage state, controlling the battery cell to discharge at a current less than or equal to a threshold. According to the embodiments of the present application, by means of the method for active discharging in a storage phase of a battery cell, electrons in a negative electrode of the battery cell are guided away by means of an external circuit, so that the contact between the electrons and an electrolyte is reduced, and gas generation from reduction of the electrolyte is reduced from the source, thereby improving the safety of the battery cell. The method can be applied to the full life cycle of a battery cell, and has a long-standing and stable gas generation reduction effect.

Description

A battery management method, system, terminal and computer-readable storage medium

[0001] This disclosure claims priority to Chinese patent application No. 2023114604913, filed on November 3, 2023, entitled “A battery management method, system, terminal and computer-readable storage medium,” which is incorporated herein by reference in its entirety. Technical Field

[0002] The present invention relates to the technical field of batteries, and in particular to a battery management method, system, terminal, and computer-readable storage medium. Background Art

[0003] Environmental issues are becoming increasingly severe worldwide. New energy power batteries, with their high energy density, long lifespan, and environmentally friendly characteristics, are widely used in various fields. However, new energy power batteries are prone to internal gas generation during use, which can easily lead to problems such as bulging, gassing, combustion, and even explosion, thus becoming a significant safety concern for these batteries.

[0004] Therefore, reducing gassing in new energy power batteries is of great significance for improving their safety and promoting their development. However, existing methods for reducing gassing in new energy power batteries are often only effective in the early stages of battery use. Once these methods are ineffective, battery safety risks often increase rapidly.

[0005] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art.

[0006] Summary of the Invention

[0007] The present application provides a battery management method, system, terminal, and computer-readable storage medium to reduce gas production caused by electrolyte reduction and improve the safety of battery cells.

[0008] To solve the above technical problems, a technical solution adopted in this application is: a battery management method, comprising:

[0009] Obtain the status information of the battery cell; the status includes working status and storage status;

[0010] In response to the battery cell being in the storage state, the battery cell is controlled to discharge at a current less than or equal to a threshold value.

[0011] In the embodiments of the present application, by actively discharging the battery cell during its storage phase, electrons in the negative electrode of the battery cell are conducted away through an external circuit, reducing contact between the electrons and the electrolyte, reducing electrolyte reduction gas production at the source, and improving the safety of the battery cell. This method is simple to implement and does not require the addition of additional additives or changes to the battery cell preparation process. It can be applied throughout the life cycle of the battery cell and has a long-term and stable effect of reducing gas production. In addition, discharging at a current less than or equal to a threshold can reduce the capacity decay of the battery cell while reducing the gas production of the battery cell. The capacity loss caused by discharging at a current less than or equal to the threshold is reversible and does not cause irreversible damage to the battery cell itself.

[0012] In some embodiments, the step of obtaining the status information of the battery cell includes:

[0013] Get the remaining power information of the battery cell;

[0014] In response to a change in the remaining power of the battery cell being greater than a threshold within a preset time period, determining that the battery cell is in a working state;

[0015] In response to a change in the remaining power of the battery cell within a preset time period being less than or equal to a threshold, it is determined that the battery cell is in a storage state.

[0016] In the embodiments of the present application, by obtaining the status information of the battery cell through the provided method, the storage status of the battery cell can be simply, quickly and accurately determined to control the battery cell to discharge at a current less than or equal to a threshold value, thereby reducing the gas production of the battery cell and improving the safety of the battery cell.

[0017] In some embodiments, the step of obtaining the status information of the battery cell includes:

[0018] Obtain voltage status information of battery cells;

[0019] In response to a difference between a maximum voltage and a minimum voltage of the battery cell within a preset time period being greater than a threshold, determining that the battery cell is in an operating state;

[0020] In response to a difference between a maximum voltage and a minimum voltage of the battery cell within a preset time period being less than or equal to a threshold, it is determined that the battery cell is in a storage state.

[0021] In the embodiment of the present application, by providing another method for obtaining the status information of the battery cell, the storage status of the battery cell can be simply, quickly and accurately determined to control the battery cell to discharge at a current less than or equal to a threshold value, thereby reducing the gas production of the battery cell.

[0022] In some embodiments, the step of controlling the battery cells to discharge at a current less than or equal to a threshold value includes:

[0023] The battery cells are controlled to charge the backup power supply at a current less than or equal to a threshold.

[0024] In the embodiment of the present application, the electric energy released by the battery cells to reduce gassing is received by the backup power supply, and the electric energy is reused, thereby reducing the waste of electric energy and improving the utilization rate of electric energy.

[0025] In some embodiments, the step of controlling the battery cells to charge the backup power supply at a current less than or equal to a threshold value includes:

[0026] Get the status information of the backup power supply; the status includes fully charged state and partially charged state;

[0027] In response to the information that the backup power source is in a partially charged state, the battery cells are controlled to charge the backup power source at a current less than or equal to a threshold value.

[0028] In an embodiment of the present application, by receiving the electric energy released by the battery cells at a current less than or equal to a threshold value when the backup power supply is not fully charged, the electric energy is reused, thereby reducing the waste of electric energy, improving the utilization rate of electric energy, and reducing the impact of receiving electric energy on the backup power supply. In some embodiments, the step of obtaining the status information of the backup power supply includes:

[0029] Obtaining the remaining power information of the backup power supply;

[0030] In response to the remaining power of the backup power supply being greater than a threshold, determining that the backup power supply is in a fully charged state;

[0031] In response to the remaining power of the backup power supply being less than or equal to a threshold, it is determined that the backup power supply is in a partially charged state.

[0032] In an embodiment of the present application, by providing a method for obtaining status information of a backup power supply, when the backup power supply is not fully charged, the electric energy released by the battery cells is received without affecting the safe use of the backup power supply, which is conducive to the safe application of the battery management method provided in the embodiment of the present application.

[0033] In some embodiments, the step of controlling the battery cells to discharge at a current less than or equal to a threshold value further includes:

[0034] In response to the backup power source being in a fully charged state, the battery cells are controlled to stop charging the backup power source, and the battery cells are controlled to discharge to the external resistor at a current less than or equal to a threshold value.

[0035] In the embodiment of the present application, by setting an external resistor, when the backup power supply is fully charged, the battery cell continues to discharge through the external resistor at a current less than or equal to the threshold value, so as to continue to reduce the gas production of the battery cell.

[0036] In some embodiments, the step of controlling the battery cells to discharge at a current less than or equal to a threshold value includes:

[0037] The battery cells are controlled to discharge at a current less than or equal to 0.001C; optionally, the battery cells are controlled to discharge at a current less than or equal to 0.0001C.

[0038] In the embodiment of the present application, by providing a current threshold, the gas generation of the battery cell is reduced without causing irreversible damage to the battery cell itself.

[0039] To solve the above technical problems, another technical solution adopted in this application is: a battery management system, comprising:

[0040] Control module;

[0041] A battery cell, communicatively connected to a control module;

[0042] The control module is configured to: obtain state information of the battery cell; and in response to the battery cell being in a storage state, control the battery cell to discharge at a current less than or equal to a threshold.

[0043] In the embodiments of the present application, the battery management system provided is used to actively discharge the battery cells during the storage stage, thereby reducing the gas production of the battery cells from the source and improving the safety of the battery cells. The system can be applied to the entire life cycle of the battery cells and has a long-term and stable effect of reducing the gas production of the battery cells.

[0044] In some embodiments, the battery management system further comprises:

[0045] A backup power supply, electrically connected to the battery cell and communicatively connected to the control module;

[0046] The control module is configured to control the battery cells to charge the backup power supply at a current less than or equal to a threshold.

[0047] In the embodiment of the present application, the backup power supply is used to receive the electric energy released by the battery cells to reduce outgassing, and the electric energy is reused, thereby reducing the waste of electric energy and improving the utilization rate of electric energy.

[0048] To solve the above technical problems, another technical solution adopted in this application is: a terminal, the terminal includes a memory, a processor, and a computer program stored in the memory and running on the processor, the processor is used to execute program data to implement the above battery management method.

[0049] In order to solve the above technical problems, another technical solution adopted in this application is: a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above battery management method are implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only 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.

[0051] FIG1 is a flow chart of a battery management method according to an embodiment of the present application;

[0052] FIG2 is a flow chart of a first method for obtaining status information of a battery cell provided in an embodiment of the present application;

[0053] FIG3 is a flow chart of a second method for obtaining status information of a battery cell provided in an embodiment of the present application;

[0054] FIG4 is another flow chart of a battery management method according to an embodiment of the present application;

[0055] FIG5 is a flow chart of a method for controlling a battery cell to charge a backup power supply at a current less than or equal to a threshold value according to an embodiment of the present application;

[0056] FIG6 is a flow chart of a method for obtaining status information of a backup power supply according to an embodiment of the present application;

[0057] FIG7 is another flow chart of a method for controlling a battery cell to charge a backup power supply at a current less than or equal to a threshold value provided by an embodiment of the present application;

[0058] FIG8 is a flow chart of a specific embodiment of a battery management method provided in an embodiment of the present application;

[0059] FIG9 is a schematic diagram of a battery management system according to an embodiment of the present application;

[0060] FIG10 is another schematic diagram of a battery management system according to an embodiment of the present application;

[0061] 11 is a schematic diagram of a terminal framework provided by an embodiment of the present invention;

[0062] FIG12 is a schematic diagram of a framework of a computer-readable storage medium provided by an embodiment of the present invention.

[0063] Description of Figure Numbers:

[0064] 100 - battery management system, 10 - control module, 20 - battery cell, 30 - backup power supply, 200 - terminal, 201 - memory, 202 - processor, 300 - computer-readable storage medium, 301 - program instruction. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only 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.

[0066] The terms "first," "second," and "third" in this application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications also change accordingly. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0067] References herein to "embodiments" 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 this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is 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.

[0068] Gassing in new energy power batteries is often caused by side reactions that occur within the battery. For example, in lithium-ion batteries, electrolyte decomposition is a key factor contributing to gassing. This can occur in two ways: First, poor battery airtightness allows moisture to enter the battery, generating gases such as CO2, H2, and O2. Second, the SEI (solid electrolyte interface) membrane fails to completely inhibit the passage of electrons, causing the electrolyte's solvent to react with it to form a large number of free radicals, which, through a chain reaction, release large amounts of hydrocarbon gases.

[0069] Currently, certain process methods are commonly used to improve the quality of the SEI film on the electrode surface, hinder electrons from passing through the SEI film, and reduce side reactions caused by direct contact between electrons and the electrolyte, thereby reducing battery gas production. For example, a strong and stable SEI film is formed on the electrode surface by adding film-forming additives to the electrolyte or improving the formation process (including but not limited to formation solution injection, formation time, and formation temperature).

[0070] The above-mentioned means are usually effective in the early stages of the battery, but in the middle or late stages, the effect of reducing battery gas production decreases significantly, and the gas production increases significantly. Once a large amount of gas is produced, the safety risks of the battery increase sharply. Taking the method of adding film-forming additives to the electrolyte to reduce battery gas production as an example, the reason why the gas production of the above-mentioned means increases significantly in the middle or late stages of the battery is explained: the film-forming additive is a sacrificial additive that replaces the electrolyte to form an SEI film on the electrode surface. However, the SEI film will crack, rupture, or even dissolve as the electrode expands during charge and discharge in the middle or late stages of the battery. The film-forming additive has been completely consumed and can no longer function. The electrolyte directly contacts the electrons at the rupture of the SEI film, and the electrolyte is reduced to produce gas, resulting in a significant increase in the gas production of the battery in the middle or late stages.

[0071] In order to solve the above problems, the embodiments of the present application provide a battery management method, system, terminal and computer-readable storage medium. Starting from the fundamental cause of battery gas production, after the battery cell leaves the factory, the electrons in the negative electrode of the battery cell are actively applied with a small current discharge method during the storage stage to conduct away the electrons through an external circuit, thereby reducing the reduction reaction and gas production caused by the contact between the electrons and the electrolyte, thereby reducing the electrolyte reduction gas production of the battery cell during the storage stage from the source.

[0072] The technical solutions described in the embodiments of this application are applicable to battery management methods, systems, terminals, and computer-readable storage media. The battery management methods, systems, terminals, and computer-readable storage media disclosed in this application can be used in the field of lithium-ion secondary batteries, as well as in the field of sodium-ion secondary batteries, and can be specifically configured as needed.

[0073] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0074] Please refer to FIG1 , which is a flow chart of a battery management method provided in an embodiment of the present application.

[0075] Referring to FIG1 , an embodiment of the present application provides a battery management method, including:

[0076] S1: Obtain the status information of the battery cell; the status includes working status and storage status;

[0077] S2: In response to the battery cell being in the storage state, controlling the battery cell to discharge at a current less than or equal to a threshold.

[0078] Battery management methods refer to methods for managing and optimizing battery parameters such as charge, voltage, current, charging, and discharging to improve battery life, extend battery life, and ensure safe use. A battery is a device that generates electrical energy. In some embodiments, a battery is a battery module composed of multiple battery cells connected in series, parallel, or in series. A battery cell is the smallest unit that makes up a battery. In some embodiments, a battery cell comprises a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive and negative electrode sheets. The operating state of a battery cell refers to the normal user state of the battery cell after it leaves the factory. In some embodiments, the operating state of a battery cell includes: a state in which the battery cell is in use to maintain normal operation of a device; a state in which the battery cell is being charged to increase its stored charge. The storage state of a battery cell refers to the non-operating state of the battery cell, typically referring to the state of the battery cell before leaving the factory and the state in which the battery cell is not in use after leaving the factory. For example, this includes the state of the battery cell during pre-factory testing and adjustment, when stored in a palletizing position, during transportation, and when the battery cell is idle after leaving the factory. The current threshold refers to a preset current intensity. Controlling the battery cells to discharge at a current less than or equal to a threshold value means controlling the battery cells to discharge at a small current, thereby reducing the impact of the small current discharge on the service life of the battery cells while reducing the gassing of the battery cells.

[0079] Specifically, when a battery cell is stored at a high state of charge (SOC), the negative electrode's potential is typically low (for graphite electrodes, this potential can drop to 60mV, and even to 0V when lithium deposition occurs; for lithium metal electrodes, this potential is 0V). However, the negative electrode at low potential has a strong reducing property, and it is generally believed that the lower the negative electrode potential, the stronger the reducing property. The electrolyte directly contacts the negative electrode at the rupture of the SEI film, and the negative electrode reduces the electrolyte to produce gas.

[0080] NCM811(Li1-x Ni 0.8 Co 0.1 Mn 0.1 Taking a battery cell with O2 as the positive electrode and lithium metal as the negative electrode as an example, the reactions occurring inside it include:

[0081] (1) The reaction chemical formula of the negative electrode includes:

[0082] Electrolyte + e = gas; the electromotive force corresponding to this process is E1, which is generally 1.2V vs Li + / Li~1.8V vs Li + / Li;

[0083] Li-e=Li + ; The electromotive force corresponding to this process is E2, E2 is 0V vs Li + / Li;

[0084] The electromotive force corresponding to the whole process is E=E1-E2=1.2V~1.8V;

[0085] (2) When the positive and negative electrodes of the battery cell are connected and discharged at a current less than or equal to the threshold, the reaction chemical formula of the positive electrode includes:

[0086] Li 1-x Ni 0.8 Co 0.1 Mn 0.1 O2+xe+xLi + =LiNi 0.8 Co 0.1 Mn 0.1 O2; the electromotive force corresponding to this process is E1'=4.23V;

[0087] Li-e=Li + , the electromotive force corresponding to this process is E2=0vs Li + / Li;

[0088] The electromotive force corresponding to the whole process is E'=E1'~E2=4.23V;

[0089] E'>E.

[0090] Therefore, when a small current is applied to the outside of the battery cell to discharge, the electrons at the negative electrode will be led out of the external circuit under the drive of the electric potential, reducing the reduction reaction with the electrolyte, thereby reducing the gas production of the battery cell.

[0091] In the embodiments of the present application, by actively discharging the battery cell during its storage phase, electrons in the negative electrode of the battery cell are conducted away through an external circuit, reducing contact between the electrons and the electrolyte, reducing electrolyte reduction gas production at the source, and improving the safety of the battery cell. This method is simple to implement and does not require the addition of additional additives or changes to the battery cell preparation process. It can be applied throughout the life cycle of the battery cell and has a long-term and stable effect of reducing gas production. In addition, discharging at a current less than or equal to a threshold can reduce the capacity decay of the battery cell while reducing the gas production of the battery cell. The capacity loss caused by discharging at a current less than or equal to the threshold is reversible and does not cause irreversible damage to the battery cell itself.

[0092] Please refer to FIG. 2 , which is a flow chart of a first method for obtaining status information of a battery cell provided in an embodiment of the present application.

[0093] In some embodiments, referring to FIG. 2 , an embodiment of the present application provides a method for obtaining status information of a battery cell, the method comprising the following steps:

[0094] S111: Obtaining the remaining power information of the battery cell;

[0095] S112: In response to a change in the remaining power of the battery cell being greater than a threshold within a preset time period, determining that the battery cell is in a working state;

[0096] S113 : In response to a change in the remaining power of the battery cell within a preset time period being less than or equal to a threshold, determining that the battery cell is in a storage state.

[0097] The remaining capacity (State of Charge, SOC) information refers to the ratio of the available power within a battery cell to its nominal capacity. For example, the preset duration is 2 minutes. Since the remaining capacity of a battery cell is always decreasing in the storage state, it is only necessary to obtain the remaining capacity of the battery cell at the current time t and the remaining capacity of the battery cell at time t-2, two minutes ago. The difference between the remaining capacity of the battery cell at time t-2 and the remaining capacity of the battery cell at the current time t is obtained. If the difference is greater than a threshold, the battery cell is determined to be in a charging or discharging state. If the difference is less than or equal to a threshold, the battery cell is determined to be in a storage state. In some embodiments, if the difference between the remaining capacity of the battery cell at time t-2 and the remaining capacity of the battery cell at the current time t is greater than a threshold, and the remaining capacity of the battery cell at time t-2 is greater than the remaining capacity of the battery cell at the current time t, the battery cell is determined to be in a discharging state. In some embodiments, if the difference between the remaining power of the battery cell at time t-2 and the remaining power of the battery cell at the current time t is greater than a threshold, and the remaining power of the battery cell at time t-2 is less than the remaining power of the battery cell at the current time t, it is determined that the battery cell is in a charging working state.

[0098] In the embodiments of the present application, by obtaining the status information of the battery cell through the provided method, the storage status of the battery cell can be simply, quickly and accurately determined to control the battery cell to discharge at a current less than or equal to a threshold value, thereby reducing the gas production of the battery cell and improving the safety of the battery cell.

[0099] Please refer to FIG. 3 , which is a flow chart of a second method for obtaining status information of a battery cell provided in an embodiment of the present application.

[0100] In some embodiments, referring to FIG3 , an embodiment of the present application provides another method for obtaining status information of a battery cell, the method comprising the following steps:

[0101] S121: Obtaining voltage status information of the battery cell;

[0102] S122: In response to a difference between a maximum voltage and a minimum voltage of the battery cell within a preset time period being greater than a threshold, determining that the battery cell is in a working state;

[0103] S123 : In response to a difference between a maximum voltage and a minimum voltage of the battery cell within a preset time period being less than or equal to a threshold, determining that the battery cell is in a storage state.

[0104] For example, the preset time length is 1 minute, and the voltage information of the battery cell at each moment in the time period between the current moment t and the moment t-1 1 minute ago is obtained. If the difference between the maximum voltage and the minimum voltage obtained within 1 minute is greater than the threshold, it is determined that the battery cell is in the working state. If the difference between the maximum voltage and the minimum voltage obtained within 1 minute is less than or equal to the threshold, it is determined that the battery cell is in the storage state.

[0105] In the embodiment of the present application, by providing another method for obtaining the status information of the battery cell, the storage status of the battery cell can be simply, quickly and accurately determined to control the battery cell to discharge at a current less than or equal to a threshold value, thereby reducing the gas production of the battery cell.

[0106] Please refer to FIG4 , which is another flowchart of the battery management method provided in an embodiment of the present application.

[0107] In some embodiments, referring to FIG4 , an embodiment of the present application provides another battery management method, including:

[0108] S1: Obtain the status information of the battery cell; the status includes working status and storage status;

[0109] S21 : In response to the battery cell being in a storage state, controlling the battery cell to charge the backup power source with a current less than or equal to a threshold.

[0110] The backup power supply is a device that receives the electrical energy released by the battery cells and discharges it at a certain power level. In some embodiments, the backup power supply can be an on-board backup power supply. In some embodiments, the battery cells charging the backup power supply also require voltage conversion to reduce the deterioration of the backup power supply caused by the discharge of the battery cells.

[0111] In the embodiment of the present application, the electric energy released by the battery cells to reduce gassing is received by the backup power supply, and the electric energy is reused, thereby reducing the waste of electric energy and improving the utilization rate of electric energy.

[0112] Please refer to FIG. 5 , which is a flow chart of a method for controlling a battery cell to charge a backup power supply at a current less than or equal to a threshold value, provided in an embodiment of the present application.

[0113] In some embodiments, referring to FIG. 5 , an embodiment of the present application provides a method for controlling a battery cell to charge a backup power supply at a current less than or equal to a threshold value, the method comprising the following steps:

[0114] S211: Acquire status information of the backup power supply; the status includes a fully charged state and a partially charged state;

[0115] S212: In response to the information that the backup power source is not fully charged, control the battery cells to charge the backup power source at a current less than or equal to a threshold.

[0116] The status information of the backup power supply refers to the remaining power information of the backup power supply.

[0117] In an embodiment of the present application, by receiving electric energy released by a battery cell with a current less than or equal to a threshold when the backup power supply is not fully charged, the electric energy is reused, thereby reducing the waste of electric energy, improving the utilization rate of electric energy, and reducing the impact of the received electric energy on the backup power supply.

[0118] Please refer to FIG. 6 , which is a flowchart of a method for obtaining status information of a backup power supply provided in an embodiment of the present application.

[0119] In some embodiments, referring to FIG6 , an embodiment of the present application provides a method for obtaining status information of a backup power supply, the method comprising the following steps:

[0120] S211a: Obtaining the remaining power information of the backup power supply;

[0121] S211b: In response to the remaining power of the backup power supply being greater than the threshold, determining that the backup power supply is in a fully charged state;

[0122] S211c: In response to the remaining power of the backup power supply being less than or equal to the threshold, determine that the backup power supply is in a partially charged state.

[0123] The remaining capacity of the backup power supply refers to the ratio of the available power in the backup power supply to the nominal capacity. In some embodiments, the threshold for determining whether the backup power supply is fully charged can be selected from a value between 95% and 100%. Taking the threshold of 98% as an example, if the remaining capacity of the backup power supply accounts for 98% of the nominal capacity, the backup power supply is determined to be fully charged. If the remaining capacity of the backup power supply accounts for 75% of the nominal capacity, the backup power supply is determined to be partially charged.

[0124] In an embodiment of the present application, by providing a method for obtaining status information of a backup power supply, when the backup power supply is not fully charged, the electric energy released by the battery cells is received without affecting the safe use of the backup power supply, which is conducive to the safe application of the battery management method provided in the embodiment of the present application.

[0125] Please refer to FIG. 7 , which is another flowchart of a method for controlling a battery cell to charge a backup power supply at a current less than or equal to a threshold value provided by an embodiment of the present application.

[0126] In some embodiments, referring to FIG. 7 , an embodiment of the present application provides another method for controlling a battery cell to discharge at a current less than or equal to a threshold value, the method further comprising:

[0127] S211: Acquire status information of the backup power supply; the status includes a fully charged state and a partially charged state;

[0128] S212: In response to the information that the backup power supply is not fully charged, controlling the battery cells to charge the backup power supply at a current less than or equal to a threshold;

[0129] S213 : In response to the backup power source being in a fully charged state, controlling the battery cells to stop charging the backup power source, and controlling the battery cells to discharge to the external resistor at a current less than or equal to a threshold value.

[0130] The external resistor is a resistor provided in the external circuit of the battery cell, which is used to release electrical energy from the battery cell. In some embodiments, the external resistor is a variable resistor, which is advantageous in that its resistance value can be adjusted according to the electrical energy released by the battery cell.

[0131] In the embodiment of the present application, by setting an external resistor, when the backup power supply is fully charged, the battery cell continues to discharge through the external resistor at a current less than or equal to the threshold value, so as to continue to reduce the gas production of the battery cell.

[0132] In some embodiments, the step of controlling the battery cells to discharge at a current less than or equal to a threshold value includes:

[0133] The battery cells are controlled to discharge at a current less than or equal to 0.001C; optionally, the battery cells are controlled to discharge at a current less than or equal to 0.0001C.

[0134] Among them, C refers to the discharge rate. The discharge current of 1C is 1 times the rated capacity. For example, if the rated capacity of the battery cell is 5 ampere-hours, 1C is 5 amperes, 0.1C is 0.5 amperes, 0.001C is 0.005 amperes, and 0.0001C is 0.0005 amperes.

[0135] In the embodiment of the present application, by providing a current threshold, the gas generation of the battery cell is reduced without causing irreversible damage to the battery cell itself.

[0136] Please refer to FIG8 , which is a flowchart of a specific embodiment of the battery management method provided in an embodiment of the present application.

[0137] 8 , an embodiment of the present application provides a specific battery management method, including the following steps:

[0138] Obtain the status information of the battery cell; the status includes working status and storage status;

[0139] If the battery cell is in the storage state, the battery cell is controlled to charge the backup power supply at a current of 0.0001C; if the battery cell is not in the storage state, the battery cell status information is continued to be obtained;

[0140] Obtain status information of the backup power supply; if in response to information that the backup power supply is not fully charged, control the battery cell to charge the backup power supply with a current of 0.0001C; if the backup power supply is fully charged, control the battery cell to stop charging the backup power supply, and control the battery cell to discharge to the external resistor with a current of 0.0001C.

[0141] Please refer to FIG9 , which is a schematic diagram of the framework of the battery management system provided in an embodiment of the present application.

[0142] Referring to FIG9 , an embodiment of the present application provides a battery management system 100, comprising a control module 10 and battery cells 20. The battery cells 20 are in communication with the control module 10. The control module 10 is configured to: obtain status information of the battery cells 20; and, in response to the battery cells 20 being in a storage state, control the battery cells 20 to discharge at a current less than or equal to a threshold.

[0143] The battery management system 100 is a device that manages and optimizes parameters such as the power, voltage, current, and charging and discharging of the battery cells 20. The control module 10 is a module that controls the battery cells 20 based on their parameter information. A battery cell 20 is the smallest unit that makes up a battery. In some embodiments, a battery cell 20 includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive and negative electrode sheets.

[0144] In an embodiment of the present application, the battery management system 100 provided is used to actively discharge the battery cell 20 during the storage stage, thereby reducing the gas production of the battery cell 20 from the source and improving the safety of the battery cell 20. The system can be applied to the entire life cycle of the battery cell 20 and has a long-term and stable effect of reducing the gas production of the battery cell 20.

[0145] Please refer to FIG. 10 , which is another schematic diagram of the framework of the battery management system provided in an embodiment of the present application.

[0146] In some embodiments, referring to FIG10 , a battery management system 100 provided in an embodiment of the present application further includes a backup power supply 30. The backup power supply 30 is electrically connected to the battery cells 20 and is in communication with the control module 10. The control module 10 is configured to control the battery cells 20 to charge the backup power supply 30 at a current less than or equal to a threshold.

[0147] The backup power supply 30 is a device that receives the electric energy released by the battery cell 20. In some embodiments, the battery may be a battery for a new energy vehicle, and the backup power supply 30 may be an onboard backup power supply.

[0148] In the embodiment of the present application, the backup power supply 30 receives the electric energy released by the battery cell 20 to reduce outgassing, and reuses the electric energy, thereby reducing the waste of electric energy and improving the utilization rate of electric energy.

[0149] Please refer to FIG11 , which is a schematic diagram of a framework of a terminal provided by an embodiment of the present invention.

[0150] Referring to Figure 11 , an embodiment of the present application provides a terminal 200 comprising a memory 201 and a processor 202 coupled to each other. Processor 202 is configured to execute program instructions stored in memory 201 to implement the steps of any of the aforementioned battery management method embodiments. In a specific implementation scenario, terminal 200 may include, but is not limited to, a microcomputer and a server. Furthermore, terminal 200 may also include, but is not limited to, mobile devices such as laptops and tablet computers.

[0151] Specifically, the processor 202 is used to control itself and the memory 201 to implement the steps of any of the above-mentioned battery management method embodiments. The processor 202 can also be called a CPU (Central Processing Unit). The processor 202 may be an integrated circuit chip with signal processing capabilities. The processor 202 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 202 can be implemented by an integrated circuit chip.

[0152] Please refer to FIG. 12 , which is a schematic diagram of a framework of a computer-readable storage medium provided in an embodiment of the present invention.

[0153] 12 , an embodiment of the present application provides a computer-readable storage medium 300 , which stores program instructions 301 that can be executed by a processor, and the program instructions 301 are used to implement the steps of any of the above-mentioned battery management method embodiments.

[0154] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments. For the sake of brevity, it will not be repeated here.

[0155] Examples and Comparative Examples

[0156] Fully charged soft-pack sodium-ion battery cells from the same batch were obtained and divided into an experimental group (samples 1 to 7) and a control group (sample 8). The initial volume V0 of each sample was measured using the water displacement method.

[0157] The experimental group includes seven samples, namely Sample 1 to Sample 7. Among them, Sample 1 was stored in a constant temperature box at 25°C for four days. During the storage period, Sample 1 was discharged using a charger and discharge machine at a rate of 0.0001C. Sample 2 was stored in a constant temperature box at 45°C for four days. During the storage period, Sample 2 was discharged using a charger and discharge machine at a rate of 0.0001C. Sample 3 was stored in a constant temperature box at 60°C for four days. During the storage period, Sample 3 was discharged using a charger and discharge machine at a rate of 0.0001C. Sample 4 was stored in a constant temperature box at 75°C for four days. During the storage period, Sample 4 was discharged using a charger and discharge machine at a rate of 0.0001C. Sample 5 was stored in a constant temperature box at 60°C for one day. During the storage period, Sample 5 was discharged using a charger and discharge machine at a rate of 0.0001C. Sample 6 was stored in a constant temperature box at 60°C for seven days. During the storage period, Sample 6 was discharged using a charger and discharge machine at a rate of 0.0001C. Sample 7 was stored in a thermostat at 60° C. for four days. During the storage period, a charge-discharge machine was used to discharge Sample 7 at a rate of 0.001C.

[0158] The control group includes one sample, sample 8. Sample 8 is stored in a constant temperature box at 60° C. for four days, and the charger is not used to discharge sample 8 during the storage period.

[0159] After each experimental group and control group reached the preset storage time, each sample was taken out, and after returning to room temperature, the current volume V1 of each sample was measured again using the drainage method, and the gas production volume V of each sample was calculated. The gas production volume V of the sample is the difference between the current volume V1 of the sample and the initial volume V0, that is, V = V1-V0.

[0160] Table 1 Test results of various experimental examples and comparative examples of this application

[0161] According to the data analysis in Table 1, we can see that:

[0162] According to the test results of Example 3 and Comparative Example 1, under the same storage temperature and storage time, the gas production volume of the battery cell using small current discharge is significantly reduced.

[0163] According to the test results of Example 3 and Example 7, under the same storage temperature and storage time, the gas production volume of the battery cells discharged at a discharge rate of 0.001C and at a discharge rate of 0.0001C is not much different. From the perspective of saving costs and reducing the loss of capacity of the battery cells caused by discharge, discharging with a smaller current, i.e., at a discharge rate of 0.0001C, is more advantageous.

[0164] According to the test results of Examples 1 to 4, under the same storage time and discharge rate, the lower the storage temperature of the battery cell, the more obvious the effect of low-current discharge on reducing battery cell gas production.

[0165] According to the test results of Examples 3, 5 and 6, under the same storage temperature and discharge rate, the shorter the storage time, the more obvious the effect of small current discharge on reducing gas production of battery cells.

[0166] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0167] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0168] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery management method, wherein: include: Acquire status information of the battery cell; the status includes working status and storage status; In response to the battery cell being in a storage state, the battery cell is controlled to discharge at a current less than or equal to a threshold value.

2. The battery management method according to claim 1, wherein: The step of obtaining the status information of the battery cell includes: Obtain the remaining power information of the battery cell; In response to a change in the remaining power of the battery cell being greater than a threshold value within a preset time period, determining that the battery cell is in a working state; In response to a change in the remaining power of the battery cell within a preset time period being less than or equal to a threshold, it is determined that the battery cell is in a storage state.

3. The battery management method according to claim 1, wherein: The step of obtaining the status information of the battery cell includes: Obtain voltage status information of battery cells; In response to a difference between a maximum voltage and a minimum voltage of the battery cell within a preset time period being greater than a threshold, determining that the battery cell is in a working state; In response to a difference between a maximum voltage and a minimum voltage of the battery cell within a preset time period being less than or equal to a threshold, it is determined that the battery cell is in a storage state.

4. The battery management method according to claim 2 or 3, wherein: The step of controlling the battery cell to discharge at a current less than or equal to a threshold value comprises: The battery cells are controlled to charge the backup power source with a current less than or equal to a threshold.

5. The battery management method according to claim 4, wherein: The step of controlling the battery cell to charge the backup power supply with a current less than or equal to a threshold value comprises: Acquire status information of the backup power supply; the status includes a fully charged state and a not fully charged state; In response to the information that the backup power source is in an under-charged state, the battery cells are controlled to charge the backup power source with a current less than or equal to a threshold value.

6. The battery management method according to claim 5, wherein: The step of obtaining the status information of the backup power supply comprises: Obtain the remaining power information of the backup power supply; In response to the remaining power of the backup power supply being greater than a threshold, determining that the backup power supply is in a fully charged state; In response to the remaining power of the backup power supply being less than or equal to a threshold, it is determined that the backup power supply is in a partially charged state.

7. The battery management method according to claim 5, wherein: The step of controlling the battery cell to discharge at a current less than or equal to a threshold value further includes: In response to the backup power source being in a fully charged state, the battery cell is controlled to stop charging the backup power source, and the battery cell is controlled to discharge to an external resistor with a current less than or equal to a threshold value.

8. The battery management method according to claim 1, wherein: The step of controlling the battery cell to discharge at a current less than or equal to a threshold value comprises: The battery cell is controlled to discharge at a current less than or equal to 0.001C; optionally, the battery cell is controlled to discharge at a current less than or equal to 0.0001C.

9. A battery management system, wherein: include: Control module; A battery cell, communicatively connected to the control module; The control module is configured to: obtain state information of a battery cell; and in response to the battery cell being in a storage state, control the battery cell to discharge with a current less than or equal to a threshold.

10. The battery management system according to claim 9, wherein: The battery management system further comprises: A backup power supply, electrically connected to the battery cell and communicatively connected to the control module; Wherein, the control module is configured to: control the battery cell to charge the backup power supply with a current less than or equal to a threshold.

11. A terminal, wherein: The terminal includes a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor is configured to execute program data to implement the battery management method according to any one of claims 1 to 8.

12. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the steps of the battery management method according to any one of claims 1 to 8 are implemented.

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