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

Abstract

The invention discloses a battery management method and system, a terminal and a computer readable storage medium, and the method comprises the steps: obtaining the state information of a single battery; and in response to the storage state of the battery cell, controlling the battery cell to discharge at a current less than or equal to a threshold value. According to the embodiment of the invention, electrons in the negative electrode of the battery monomer are guided away through an external circuit by a method of active discharging in the storage stage of the battery monomer, the contact between the electrons and the electrolyte is reduced, the reduction gas production of the electrolyte is reduced from the source, the safety of the battery monomer is improved, and the method can be applied to the whole life cycle of the battery monomer and has a wide application prospect. The effect of stably reducing gas production for a long time is achieved. In addition, the capacity loss caused by discharging at the current smaller than or equal to the threshold value is reversible loss, and irreversible damage to the battery single body is avoided.

Description

Technical Field

[0001] 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

[0002] Environmental problems in the world are becoming increasingly serious. New energy power batteries are widely used in many fields due to their high energy density, long service life, and environmental protection. However, new energy power batteries are prone to produce gas inside the battery during use, which can easily cause bulging, gas emission, combustion, and even explosion, which is an important factor affecting the safety of new energy power batteries.

[0003] Therefore, reducing the gas production of new energy power batteries is of great significance to improving the safety of new energy power batteries and promoting the development of new energy power batteries. However, the existing means of reducing the gas production of new energy power batteries are often only effective in the early stage of battery use. Once the effect is lost, the safety risks of the battery tend to increase rapidly.

[0004] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0005] The present application provides a battery management method, system, terminal and computer-readable storage medium to reduce the reduction gas generation of electrolyte and improve the safety of battery cells.

[0006] In order to solve the above technical problems, a technical solution adopted in this application is: a battery management method, comprising:

[0007] Obtain the status information of the battery cell; the status includes working status and storage status;

[0008] 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.

[0009] In the embodiments of the present application, the electrons in the negative electrode of the battery cell are conducted away through an external circuit by actively discharging the battery cell during the storage stage, thereby reducing the contact between the electrons and the electrolyte, reducing the reduction gas production of the electrolyte from the source, and improving the safety of the battery cell. This method is simple to implement, does not require the addition of additional additives or changes in the preparation process of the battery cell, and can be applied to the entire life cycle of the battery cell, with a long-term and stable effect of reducing gas production. In addition, discharging with a current less than or equal to the threshold can reduce the capacity attenuation of the battery cell while reducing the gas production of the battery cell, and the capacity loss caused by discharging with a current less than or equal to the threshold is a reversible loss, and will not cause irreversible damage to the battery cell itself.

[0010] In some embodiments, the step of obtaining the status information of the battery cell includes:

[0011] Obtain the remaining power information of the battery cell;

[0012] In response to a change in the remaining power of the battery cell within a preset time period being greater than a threshold, determining that the battery cell is in a working state;

[0013] 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.

[0014] 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.

[0015] In some embodiments, the step of obtaining the status information of the battery cell includes:

[0016] Obtain voltage status information of battery cells;

[0017] In response to a difference between a maximum voltage and a minimum voltage of a battery cell within a preset time period being greater than a threshold, determining that the battery cell is in a working state;

[0018] 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.

[0019] 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 generation of the battery cell.

[0020] In some embodiments, the step of controlling the battery cells to discharge at a current less than or equal to a threshold value includes:

[0021] The battery cells are controlled to charge the backup power source at a current less than or equal to a threshold value.

[0022] In the embodiments 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.

[0023] In some embodiments, the step of controlling the battery cells to charge the backup power source with a current less than or equal to a threshold value includes:

[0024] Obtain status information of the backup power supply; the status includes a fully charged state and a not fully charged state;

[0025] 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.

[0026] In an embodiment of the present application, when the backup power supply is not fully charged, the power released by the battery cell with a current less than or equal to a threshold is received, and the power is reused, thereby reducing the waste of power, improving the utilization rate of power, and reducing the impact of receiving power on the backup power supply. In some embodiments, the step of obtaining the status information of the backup power supply includes:

[0027] Obtain the remaining power information of the backup power supply;

[0028] 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;

[0029] 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.

[0030] In the embodiments 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 embodiments of the present application.

[0031] 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:

[0032] 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.

[0033] 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 generation of the battery cell.

[0034] In some embodiments, the step of controlling the battery cells to discharge at a current less than or equal to a threshold value includes:

[0035] 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.

[0036] In the embodiment of the present application, by providing a current threshold, the battery cell gas generation is reduced without causing irreversible damage to the battery cell itself. To solve the above technical problem, another technical solution adopted by the present application is: a battery management system, comprising:

[0037] Control module;

[0038] A battery cell, which is in communication connection with a control module;

[0039] 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 with a current less than or equal to a threshold.

[0040] In the embodiments of the present application, through the provided battery management system, the battery cells are actively discharged 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.

[0041] In some embodiments, it also includes:

[0042] A backup power supply, electrically connected to the battery cell and communicatively connected to the control module;

[0043] The control module is configured to control the battery cells to charge the backup power supply with a current less than or equal to a threshold value.

[0044] In the embodiments of the present application, the electric energy released by the battery cells to reduce gassing is received through a backup power supply, and the electric energy is reused, thereby reducing the waste of electric energy and improving the utilization rate of electric energy.

[0045] To solve the above technical problems, another technical solution adopted in the present 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.

[0046] In order to solve the above technical problem, another technical solution adopted by the present application is: a computer-readable storage medium, on which a computer program is stored, and the steps of the above method are implemented when the computer program is executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 paying any creative work.

[0048] Figure 1 is a flowchart of a battery management method provided in an embodiment of the present application;

[0049] Figure 2is a flowchart of a first method for obtaining status information of a battery cell provided in an embodiment of the present application;

[0050] Figure 3 is a flow chart of a second method for obtaining status information of a battery cell provided in an embodiment of the present application;

[0051] Figure 4 is another flow chart of the battery management method provided in an embodiment of the present application;

[0052] Figure 5 It is a flowchart of a method for controlling a battery cell to charge a backup power supply with a current less than or equal to a threshold value provided by an embodiment of the present application;

[0053] Figure 6 is a flowchart of a method for obtaining status information of a backup power supply provided in an embodiment of the present application;

[0054] Figure 7 is another flow chart of a method for controlling a battery cell to charge a backup power supply with a current less than or equal to a threshold value provided by an embodiment of the present application;

[0055] Figure 8 It is a flowchart of a specific embodiment of the battery management method provided in the embodiment of the present application;

[0056] Fig. 9 is a schematic diagram of a battery management system provided in an embodiment of the present application;

[0057] Fig.10 is another schematic diagram of a battery management system provided in an embodiment of the present application;

[0058] Fig.11 is a schematic diagram of a framework of a terminal provided by an embodiment of the present invention;

[0059] Fig.12 It is a schematic diagram of the framework of a computer-readable storage medium provided by an embodiment of the present invention.

[0060] Description of Figure Numbers:

[0061] 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

[0062] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0063] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0064] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] The reason for the gas production of new energy power batteries is often due to the side reactions that are prone to occur inside the battery. Taking lithium-ion batteries as an example, the decomposition of the electrolyte inside is an important factor causing gas production. The decomposition of the electrolyte includes the following two situations: one is that due to the poor airtightness of the battery, moisture in the air enters it, resulting in the production of CO2, H2, O2 and other gases; the other is that the SEI membrane (solid electrolyte interface) cannot completely inhibit the passage of electrons, resulting in the reaction of the solvent in the electrolyte with it to generate a large number of free radicals, which release a large amount of hydrocarbon gas through a chain reaction.

[0066] At present, certain process means are usually used to improve the quality of the SEI film on the electrode surface, hinder electrons from passing through the SEI film, and reduce the side reactions caused by direct contact between electrons and electrolytes, so as to achieve the effect of 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 injection, formation time, and formation temperature).

[0067] The above methods usually have good effects in the early stage of the battery, but in the middle or late stage, the effect of reducing battery gas production is significantly reduced, and the gas production is significantly increased. Once a large amount of gas is produced, the safety risks of the battery rise sharply. Take the method of adding film-forming additives to the electrolyte to reduce battery gas production as an example to explain why the gas production of the above methods increases significantly in the middle or late stages of the battery: the film-forming additive is a sacrificial additive that replaces the electrolyte to form an SEI film on the electrode surface, but the SEI film will crack, rupture or even dissolve as the electrode expands during charging and discharging in the middle or late stages of the battery, and the film-forming additive has been consumed and can no longer play a role. 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.

[0068] 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 cells leave the factory, a small current discharge is actively applied during the storage stage to conduct the electrons in the negative electrode of the battery cells 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 cells during the storage stage from the source.

[0069] The technical solution described in the embodiments of this application is 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, and can also be used in the field of sodium-ion secondary batteries, and can be specifically configured according to needs.

[0070] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0071] See also Figure 1 , Figure 1 It is a flowchart of the battery management method provided in the embodiment of the present application.

[0072] See also Figure 1 , an embodiment of the present application provides a battery management method, comprising:

[0073] S1: Obtaining the status information of the battery cell; the status includes working status and storage status;

[0074] 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 value.

[0075] Among them, the battery management method refers to a method for managing and optimizing the battery's power, voltage, current, charging and discharging parameters to improve the battery's endurance, extend the battery's service life, and ensure the safety of the battery. A battery refers to a device that can generate electrical energy. In some embodiments, a battery refers to a battery module composed of multiple battery cells connected in series, in parallel, or in mixed series. A battery cell refers to the smallest unit that constitutes a battery. In some embodiments, a battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. The working state of a battery cell refers to the normal use state of the user after the battery cell leaves the factory. In some embodiments, the working state of a battery cell includes: a state in which the battery cell is used to maintain the normal operation of the device, and a state in which the battery cell is charged to increase its stored power. The storage state of a battery cell refers to the non-working state of the battery cell, which generally refers to the state of the battery cell before leaving the factory and the state in which the battery cell is not used by the user after leaving the factory. For example, it includes the state in which the battery cell is tested and regulated before leaving the factory, when stored in a stacking position, when in transportation, and the state in which the battery cell is idle after leaving the factory. The threshold value of the current refers to the preset current intensity. Controlling the battery cell to discharge with a current less than or equal to a threshold value refers to controlling the battery cell to discharge with a small current, thereby reducing the impact of the small current discharge on the service life of the battery cell while reducing the gassing of the battery cell.

[0076] Specifically, when a battery cell is stored at a high state of charge (SOC), the potential of the negative electrode is usually low (the negative electrode is a graphite electrode, and its potential can drop to 60mV. When lithium is deposited on the graphite electrode, its potential will even drop to 0V; the negative electrode is a lithium metal electrode, and its potential is 0V). The negative electrode at a low potential has a strong reducing property. It is generally believed that the lower the negative electrode potential, the stronger the reducing property. The electrolyte will directly contact the negative electrode at the rupture of the SEI film, and the negative electrode will reduce the electrolyte to produce gas.

[0077] NCM811(Li 1-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:

[0078] (1) The reaction chemical formula of the negative electrode includes:

[0079] Electrolyte + e = gas; the electromotive force corresponding to this process is E1, which is generally 1.2V vs Li + / Li-1.8V vsLi + / Li;

[0080] Li-e=Li + ; The electromotive force corresponding to this process is E2, E2 is 0V vs Li+ / Li;

[0081] The electromotive force corresponding to the whole process is E=E1-E2=1.2V-1.8V;

[0082] (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:

[0083] 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;

[0084] Li-e=Li + , the electromotive force corresponding to this process is E2=0vs Li + / Li;

[0085] The electromotive force corresponding to the whole process is E'=E1'-E2=4.23V;

[0086] E'>E.

[0087] 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 driven by the electric potential to reduce the reduction reaction with the electrolyte, thereby reducing the gas production of the battery cell.

[0088] In the embodiments of the present application, the electrons in the negative electrode of the battery cell are conducted away through an external circuit by actively discharging the battery cell during the storage stage, thereby reducing the contact between the electrons and the electrolyte, reducing the reduction gas production of the electrolyte from the source, and improving the safety of the battery cell. This method is simple to implement, does not require the addition of additional additives or changes in the preparation process of the battery cell, and can be applied to the entire life cycle of the battery cell, with a long-term and stable effect of reducing gas production. In addition, discharging with a current less than or equal to the threshold can reduce the capacity attenuation of the battery cell while reducing the gas production of the battery cell, and the capacity loss caused by discharging with a current less than or equal to the threshold is a reversible loss, and will not cause irreversible damage to the battery cell itself.

[0089] See also Figure 2 , Figure 2 It is a flowchart of a first method for obtaining status information of a battery cell provided in an embodiment of the present application.

[0090] In some embodiments, see Figure 2 , an embodiment of the present application provides a method for obtaining status information of a battery cell, the method comprising the following steps:

[0091] S111: Obtaining the remaining power information of the battery cell;

[0092] S112: in response to the remaining power of the battery cell changing more than a threshold value within a preset time period, determining that the battery cell is in a working state;

[0093] S113: In response to the remaining power of the battery cell changing less than or equal to a threshold value within a preset time period, determining that the battery cell is in a storage state.

[0094] Among them, the remaining power information (State Of Charge, referred to as SOC) refers to the ratio of the available power in the battery cell to the nominal capacity. For example, the preset duration is 2 minutes. Since the remaining power of the battery cell is always in a downward trend in the storage state, it is only necessary to obtain the remaining power of the battery cell at the current time t and the remaining power of the battery cell at the time t-2 2 minutes ago, and obtain the difference between the remaining power of the battery cell at the time t-2 and the remaining power of the battery cell at the current time t. If the difference is greater than the threshold, it is determined that the battery cell is in a charging or discharging working state. If the difference is less than or equal to the threshold, it is determined that the battery cell is in a storage state. In some embodiments, if the difference between the remaining power of the battery cell at the time t-2 and the remaining power of the battery cell at the current time t is greater than the threshold, and the remaining power of the battery cell at the time t-2 is greater than the remaining power of the battery cell at the current time t, it is determined that the battery cell is in a discharging working 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.

[0095] 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.

[0096] See also Figure 3 , Figure 3It is a flowchart of a second method for obtaining status information of a battery cell provided in an embodiment of the present application.

[0097] In some embodiments, see Figure 3 , an embodiment of the present application provides another method for obtaining status information of a battery cell, the method comprising the following steps:

[0098] S121: Obtaining voltage status information of the battery cell;

[0099] S122: In response to the difference between the maximum voltage and the 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;

[0100] S123: In response to the difference between the maximum voltage and the minimum voltage of the battery cell within the preset time period being less than or equal to a threshold, determining that the battery cell is in a storage state.

[0101] 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 a 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 a storage state.

[0102] 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 generation of the battery cell.

[0103] See also Figure 4 , Figure 4 It is another flowchart of the battery management method provided in an embodiment of the present application.

[0104] In some embodiments, see Figure 4 , an embodiment of the present application provides another battery management method, comprising:

[0105] S1: Obtaining the status information of the battery cell; the status includes working status and storage status;

[0106] 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.

[0107] The backup power supply is a device that receives the electric energy released by the battery cells and can discharge at a certain power. In some embodiments, the backup power supply can be a vehicle-mounted backup power supply. In some embodiments, the battery cells also need to undergo voltage conversion when charging the backup power supply to reduce the deterioration effect of the discharge of the battery cells on the backup power supply.

[0108] In the embodiments 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.

[0109] See also Figure 5 , Figure 5 It is a flowchart of a method for controlling a battery cell to charge a backup power supply with a current less than or equal to a threshold value provided in an embodiment of the present application.

[0110] In some embodiments, see Figure 5 , an embodiment of the present application provides a method for controlling a battery cell to charge a backup power supply with a current less than or equal to a threshold value, the method comprising the following steps:

[0111] S211: Acquire status information of the backup power supply; the status includes a fully charged state and a not fully charged state;

[0112] 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 with a current less than or equal to a threshold value.

[0113] The status information of the backup power supply refers to the remaining power information of the backup power supply.

[0114] 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 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 the received electric energy on the backup power supply.

[0115] See also Figure 6 , Figure 6 It is a flowchart of a method for obtaining status information of a backup power supply provided in an embodiment of the present application.

[0116] In some embodiments, see Figure 6 , an embodiment of the present application provides a method for obtaining status information of a backup power supply, the method comprising the following steps:

[0117] S211a: Obtaining remaining power information of the backup power supply;

[0118] S211b: 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;

[0119] S211c: In response to the remaining power of the backup power supply being less than or equal to a threshold, determining that the backup power supply is in a partially charged state.

[0120] The remaining power 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 point value between 95% and 100%. Taking the threshold of 98% as an example, if the remaining power of the backup power supply accounts for 98% of the nominal capacity, the backup power supply is determined to be fully charged, and if the remaining power of the backup power supply accounts for 75% of the nominal capacity, the backup power supply is determined to be not fully charged.

[0121] In the embodiments 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 embodiments of the present application.

[0122] See also Figure 7 , Figure 7 This is another flow chart of a method for controlling a battery cell to charge a backup power supply with a current less than or equal to a threshold value provided in an embodiment of the present application.

[0123] In some embodiments, see Figure 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:

[0124] S211: Acquire status information of the backup power supply; the status includes a fully charged state and a not fully charged state;

[0125] S212: In response to the information that the backup power source is in a partially charged state, controlling the battery cells to charge the backup power source with a current less than or equal to a threshold;

[0126] 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 with a current less than or equal to a threshold value.

[0127] The external resistor refers to a resistor set in the external circuit of the battery cell, which is used for the battery cell to release electrical energy. In some embodiments, the external resistor is a variable resistor, which is conducive to adaptively adjusting the size of its resistance value according to the electrical energy released by the battery cell.

[0128] 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 generation of the battery cell.

[0129] In some embodiments, the step of controlling the battery cells to discharge at a current less than or equal to a threshold value includes:

[0130] 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.

[0131] 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.

[0132] In the embodiments 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.

[0133] See also Figure 8 , Figure 8 It is a flowchart of a specific embodiment of the battery management method provided in the embodiment of the present application.

[0134] See also Figure 8 , an embodiment of the present application provides a specific battery management method, comprising the following steps:

[0135] Obtain the status information of the battery cell; the status includes working status and storage status;

[0136] If the battery cell is in a storage state, the battery cell is controlled to charge the backup power supply with a current of 0.0001C; if the battery cell is not in a storage state, the state information of the battery cell continues to be obtained;

[0137] 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 an external resistor with a current of 0.0001C.

[0138] See also Fig. 9 , Fig. 9 It is a schematic diagram of the framework of the battery management system provided in the embodiment of the present application.

[0139] See also Fig. 9 The embodiment of the present application provides a battery management system 100, including a control module 10 and a battery cell 20. The battery cell 20 is in communication connection with the control module 10. The control module 10 is configured to: obtain state information of the battery cell 20; in response to the battery cell 20 being in a storage state, control the battery cell 20 to discharge with a current less than or equal to a threshold.

[0140] The battery management system 100 refers to a device for managing and optimizing the parameters such as the power, voltage, current, charging and discharging of the battery cell 20. The control module 10 refers to a module for controlling the battery cell 20 according to the parameter information of the battery cell 20. The battery cell 20 refers to the smallest unit that constitutes the battery. In some embodiments, the battery cell 20 includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0141] In the embodiment of the present application, the battery management system 100 is provided 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.

[0142] See also Fig.10 , Fig.10 It is another framework schematic diagram of the battery management system provided in an embodiment of the present application.

[0143] In some embodiments, see Fig.10 The battery management system 100 provided in the embodiment of the present application further includes a backup power supply 30. The backup power supply 30 is electrically connected to the battery cell 20 and is in communication connection with the control module 10. The control module 10 is configured to: control the battery cell 20 to charge the backup power supply 30 with a current less than or equal to a threshold.

[0144] The backup power supply 30 refers to 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 a vehicle-mounted backup power supply.

[0145] In the embodiment of the present application, the backup power supply 30 receives the electric energy released by the battery cell 20 to reduce deflation, and reuses the electric energy, thereby reducing the waste of electric energy and improving the utilization rate of electric energy.

[0146] See also Fig.11 , Fig.11 It is a schematic diagram of the framework of a terminal provided by an embodiment of the present invention.

[0147] See also Fig.11, an embodiment of the present application provides a terminal 200, which includes a memory 201 and a processor 202 coupled to each other. The processor 202 is used to execute program instructions stored in the memory 201 to implement the steps of any of the above battery management method embodiments. In a specific implementation scenario, the terminal 200 may include but is not limited to: a microcomputer, a server, and in addition, the terminal 200 may also include but is not limited to mobile devices such as a laptop computer and a tablet computer.

[0148] 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 (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (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.

[0149] See also Fig.12 , Fig.12 It is a schematic diagram of the framework of a computer-readable storage medium provided by an embodiment of the present invention.

[0150] See also Fig.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.

[0151] 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, and for the sake of brevity, it will not be repeated here.

[0152] Example 1

[0153] The same batch of fully charged soft-pack sodium-ion battery cells were obtained and divided into an experimental group and a control group. The initial volume V0 of each battery cell was measured by the water displacement method, and the initial voltage U0 of each battery cell was recorded.

[0154] The experimental group includes seven samples, which are stored in a constant temperature box at 25°C, 45°C, 60°C, 75°C, 60°C, 60°C, and 60°C, respectively. Samples 1 to 4 are stored for four days, sample 5 is stored for one day, sample 6 is stored for seven days, and sample 7 is stored for four days. The charger and discharge machine is used to discharge samples 1 to 6 at a current of 0.0001C, and sample 7 is discharged at a current of 0.001C. The control group includes one sample, which is stored in a constant temperature box at 60°C for four days, and sample 8 is not discharged.

[0155] After the experimental group and the control group reached the preset storage time, each sample was taken out, and after returning to room temperature, the current volume V1 of each battery cell was measured again by the water displacement method, and finally the gas production volume V of each battery cell was calculated, V=V1-V0.

[0156] Table 1 Test results of the experimental examples of this application

[0157]

[0158] According to the data analysis in Table 1:

[0159] According to the test results of Example 3 and Comparative Example 1, under the same storage temperature and storage time, the gas generation volume of the battery cell using a small current discharge is significantly reduced.

[0160] 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 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.

[0161] According to the test results of Examples 1-4, under the conditions of the same storage time and discharge rate, the lower the storage temperature of the battery cell, the more obvious the effect of small current discharge on reducing gas generation of the battery cell.

[0162] 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 generation of battery cells.

[0163] In the several embodiments provided in the present 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 only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, 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 interfaces, devices or units, which can be electrical, mechanical or other forms.

[0164] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0165] 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 present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery management method, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: Also includes: 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, characterized in that: 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, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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