Battery charging control method, apparatus, device, and medium

Abstract

The application provides a battery charging control method, device, equipment and medium, the method comprises: obtaining the current charging current and current voltage of the battery; obtaining the preset safety voltage threshold corresponding to the current charging current of the battery; and determining the charging strategy information of the battery based on the current voltage and the preset safety voltage threshold.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a control method, apparatus, device and medium for battery charging. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] During actual charging, the battery charging current must be kept below the safe charging current threshold to ensure charging safety. Related technologies typically first determine the battery's state of charge (SOC), then obtain the safe charging current threshold for that SOC, and compare the battery's charging current with the safe charging current threshold to determine whether charging is safe, thereby adjusting the battery charging strategy accordingly.

[0004] However, during battery charging, errors caused by inaccurate calculations of the battery's state of charge can lead to inaccurate adjustments to the charging strategy, potentially affecting the battery's safety performance. Summary of the Invention

[0005] This application aims to at least address one of the technical problems existing in the prior art. Therefore, one object of this application is to provide a battery charging control method, apparatus, device, and medium to solve the problems in the related art.

[0006] An embodiment of the first aspect of this application provides a battery charging control method, including: acquiring the current charging current and current voltage of the battery; acquiring a preset safe voltage threshold corresponding to the current charging current of the battery; and determining battery charging strategy information based on the current voltage and the preset safe voltage threshold.

[0007] In the technical solution of this application embodiment, when the battery is charging, the current charging current and current voltage of the battery, as well as the preset safe voltage threshold corresponding to the current charging current, can be directly obtained. Then, the charging strategy information of the battery is determined by using the current voltage and the preset safe voltage threshold. Therefore, the charging strategy can be adjusted in real time based on the current voltage. Since the battery voltage can be accurately obtained, dynamically adjusting the battery charging current based on the voltage can ensure charging safety.

[0008] In some embodiments, the charging strategy information includes a target charging current, and the method further includes: performing a charging control operation based on the target charging current, so that the battery continues to be charged at the target charging current. Therefore, by adjusting the charging current in real time based on the current voltage and using the adjusted target charging current to charge the battery, compared to directly charging the battery with the current charging current, charging safety can be ensured, and potential safety hazards are less likely to occur.

[0009] In some embodiments, determining battery charging strategy information based on the current voltage and a preset safe voltage threshold includes: determining a target charging current in response to determining that the current voltage is greater than the preset safe voltage threshold, wherein the target charging current is less than the current charging current. When the current voltage is greater than the preset safe voltage threshold, it indicates that the current charging current of the battery is too high. By adjusting the charging strategy in real time to reduce the charging current, safety hazards can be avoided.

[0010] In some embodiments, in response to determining that the current voltage is greater than a preset safe voltage threshold, determining a target charging current includes: reducing the battery's charging current to a transition charging current; acquiring the transition voltage of the battery when charging with the transition charging current; acquiring the transition safe voltage threshold of the battery corresponding to the transition charging current; and in response to determining that the transition voltage is greater than the transition safe voltage threshold, further reducing the battery's charging current. Adjusting the battery's charging strategy by reducing the charging current avoids excessive charging current and potential safety hazards.

[0011] In some embodiments, determining a target charging current in response to determining that the current voltage is greater than a preset safe voltage threshold includes: determining a transition charging current as the target charging current in response to determining that the transition voltage is less than or equal to a transition safe voltage threshold. When the battery charging current decreases, and the current voltage is less than or equal to the safe voltage threshold corresponding to the current charging current, the battery is already in a safe charging state, and there is no need to further reduce the battery charging current. This ensures the battery's safety performance while avoiding low charging efficiency due to excessively low charging current.

[0012] In some embodiments, a battery charging strategy is determined based on the current voltage and a preset safe voltage threshold, including: in response to determining that the current voltage is less than or equal to the preset safe voltage threshold, determining the current charging current as the target charging current. When the current voltage is less than or equal to the safe voltage threshold corresponding to the current charging current, the battery charging current is not reduced while the battery is in a safe state. This ensures battery charging safety while avoiding excessively low charging current that could affect charging efficiency.

[0013] In some embodiments, obtaining the current charging current and current voltage of the battery includes: obtaining the current charging current and current voltage from the battery management system, which is faster and more convenient.

[0014] In some embodiments, the method further includes: obtaining a safe voltage threshold corresponding to each of a plurality of safe charging current thresholds; and storing a one-to-one mapping relationship between the plurality of safe charging current thresholds and the plurality of safe voltage thresholds to obtain a mapping table, wherein the preset safe voltage threshold is obtained from the mapping table based on the current charging current. By pre-establishing the mapping relationship between the charging current and the safe voltage threshold, the safe voltage threshold corresponding to the current current can be easily obtained from the mapping table.

[0015] In some embodiments, obtaining the safe voltage threshold corresponding to each of the multiple safe charging current thresholds includes: charging the experimental battery with any one of the multiple safe charging current thresholds until the experimental battery is charged to the state of charge corresponding to the safe charging current threshold; and obtaining the voltage of the experimental battery in the state of charge as the safe voltage threshold. The mapping table obtained through the experimental battery has higher accuracy and is easier to use subsequently.

[0016] An embodiment of the second aspect of this application provides a battery charging control device, comprising: a first acquisition module configured to acquire the current charging current and current voltage of the battery; a second acquisition module configured to acquire a preset safe voltage threshold of the battery corresponding to the current charging current; and a determination module configured to determine battery charging strategy information based on the current voltage and the preset safe voltage threshold.

[0017] In some embodiments, the charging strategy information includes a target charging current, and the device further includes a control module configured to perform a charging control operation based on the target charging current, such that the battery continues to be charged at the target charging current.

[0018] In some embodiments, the control module includes: a first sub-determination module configured to determine a target charging current in response to determining that the current voltage is greater than a preset safe voltage threshold, wherein the target charging current is less than the current charging current.

[0019] In some embodiments, the first sub-determining module is further configured to: reduce the battery's charging current to a transition charging current; obtain the transition voltage of the battery when it is charged using the transition charging current; obtain the transition safety voltage threshold of the battery corresponding to the transition charging current; and, in response to determining that the transition voltage is greater than the transition safety voltage threshold, reduce the battery's charging current again.

[0020] In some embodiments, the first sub-determining module is further configured to: determine the transition charging current as the target charging current in response to determining that the transition voltage is less than or equal to the transition safety voltage threshold.

[0021] In some embodiments, the control module includes a second sub-determination module configured to determine the current charging current as the target charging current in response to determining that the current voltage is less than or equal to a preset safe voltage threshold.

[0022] In some embodiments, the first acquisition module is configured to acquire the current charging current and the current voltage from the battery management system.

[0023] In some embodiments, the apparatus further includes: a third acquisition module configured to acquire a safe voltage threshold corresponding to each of a plurality of charging currents; and a storage module configured to store a one-to-one mapping relationship between the plurality of charging currents and the plurality of safe voltage thresholds to obtain a mapping table, wherein the preset safe voltage threshold is obtained from the mapping table based on the current charging current.

[0024] In some embodiments, the third acquisition module is further configured to: charge the experimental battery with any one of a plurality of safe charging current thresholds, and charge the experimental battery to the state of charge corresponding to the safe charging current threshold; and acquire the voltage of the experimental battery in the state of charge as the safe voltage threshold.

[0025] An embodiment of the third aspect of this application provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform a battery charging control method of any embodiment.

[0026] An embodiment of the fourth aspect of this application provides a battery management system, including an electronic device according to any embodiment.

[0027] An embodiment of the fifth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a battery charging control method according to any embodiment.

[0028] An embodiment of the sixth aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements a battery charging control method according to any embodiment.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0031] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0032] Figure 2 This is an exploded structural diagram of a battery according to some embodiments of this application;

[0033] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0034] Figure 4 A flowchart illustrating a battery charging control method for some embodiments of this application;

[0035] Figure 5 A flowchart illustrating a battery charging control method for other embodiments of this application;

[0036] Figure 6 A flowchart illustrating a battery charging control method for some embodiments of this application;

[0037] Figure 7 A flowchart illustrating a battery charging control method for some embodiments of this application;

[0038] Figure 8 A flowchart illustrating a battery charging control method for some embodiments of this application;

[0039] Figure 9 Block diagram of a battery charging control device according to some embodiments of this application;

[0040] Figure 10 Block diagram of a battery charging control device for some other embodiments of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1000, vehicles;

[0043] 100. Battery; 200. Controller; 300. Motor;

[0044] 10. Box body; 11. First part; 12. Second part;

[0045] 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Housing; 23. Cell assembly; 23a. Tab;

[0046] 301. First acquisition module; 302. Second acquisition module; 303. Determination module; 304. Control module; 341. First sub-determination module; 342. Second sub-determination module; 305. Third acquisition module; 306. Storage module. Detailed Implementation

[0047] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0053] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0054] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0055] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0056] The applicant notes that during the charging process, the battery's safe charging current threshold varies depending on the battery's state of charge. Furthermore, as the battery's state of charge increases, the safe charging current threshold gradually decreases. Therefore, as the battery continues charging, the charging current needs to be gradually reduced to avoid excessive charging current causing safety hazards.

[0057] The applicant's research found that, in order to adjust the battery charging current, related technologies use an ampere-hour integration method to obtain the battery's state of charge (SOC) during charging, then determine the safe charging current threshold for that SOC, and finally adjust the charging strategy by comparing the charging current with the safe charging current threshold. However, during battery charging, errors can occur due to inaccurate calculations of the SOC. Adjusting the charging strategy based solely on the SOC would result in an inaccurate charging strategy, affecting the battery's safety performance.

[0058] Based on the above considerations, and to address the safety issues arising from inaccurate state-of-charge (SOC) calculations during battery charging, the applicant has designed a battery charging control method. This method first acquires the current charging current and voltage of the battery, along with a preset safety voltage threshold corresponding to the current charging current. Then, it determines the battery charging strategy based on the current voltage and the preset safety voltage threshold. Because the battery voltage can be accurately obtained, dynamically adjusting the charging current based on the voltage ensures charging safety and avoids safety issues caused by inaccurate SOC calculations during charging.

[0059] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and batteries disclosed in this application. This helps ensure battery safety during charging and improves battery performance stability and lifespan.

[0060] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0061] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0062] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0063] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0064] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0065] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0066] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0067] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap 21, a housing 22, a cell assembly 23, and other functional components.

[0068] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 21a can be provided on end cap 21. Electrode terminals 21a can be used for electrical connection with cell assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0069] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the cell assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the cell assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0070] The cell assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more cell assemblies 23. The cell assembly 23 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the cell assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals to form a current loop.

[0071] This application provides a battery charging control method. Figure 4 For flowcharts of battery charging control methods according to some embodiments of this application, see [link to flowchart]. Figure 4 The control method includes:

[0072] Step S101: Obtain the current charging current and current voltage of the battery.

[0073] Step S102: Obtain the preset safe voltage threshold of the battery corresponding to the current charging current.

[0074] Step S103: Determine the battery charging strategy information based on the current voltage and the preset safe voltage threshold.

[0075] In this embodiment of the application, the battery will have corresponding charging current and voltage when it is charging. The current charging current and current voltage of the battery can be directly obtained from the battery management system (BMS).

[0076] In the embodiments of this application, the safe charging current threshold for a battery at a certain state of charge is given by the battery manufacturer based on factors such as the battery chemical system capability, the overcurrent capability of the internal mechanical components, and the battery temperature rise. In actual battery applications, the safe charging current threshold for any state of charge is known. Due to the characteristics of the battery chemical system, the safe charging current threshold decreases as the state of charge increases; on the other hand, as the state of charge increases, the battery's open-circuit voltage increases, and the polarization caused by charging also increases. Therefore, when charging with the same current, the battery's charging voltage increases as the state of charge increases.

[0077] In this embodiment, based on the known safe charging current threshold for the battery at each state of charge, the battery voltage at which it is charged with a certain charging current to the state of charge corresponding to that current (using that current as the safe current threshold) is taken as the preset safe voltage threshold corresponding to that current. This results in a one-to-one mapping relationship between a certain safe charging current threshold and the preset safe voltage threshold corresponding to that safe charging current. Therefore, the preset safe voltage threshold corresponding to a certain charging current is the maximum voltage of the battery when charged with that current while ensuring that the charging current is less than the safe charging current threshold at each moment.

[0078] In this embodiment, the preset safe voltage threshold of the battery corresponding to the current charging current can be directly obtained from the battery management system.

[0079] The charging current of a battery is related to its voltage. In this embodiment, the charging current is adjusted based on the battery's current voltage, thus dynamically adjusting the battery's charging strategy. Since the battery voltage can be accurately obtained, dynamically adjusting the charging current based on the voltage ensures battery charging safety.

[0080] For example, if a battery is charged with a charging current of I1 to an unknown state of charge (SOC0), and the battery voltage at this point is E1, with the safe voltage threshold corresponding to I1 being Emax: If E1 > Emax, then the current SOC0 is greater than the SOC with I1 as the safe charging current threshold. Since the battery's SOC and the safe charging current threshold are negatively correlated, I1 is greater than the safe charging current threshold for the current SOC, making the current charging unsafe and requiring adjustment of the charging strategy. If E1 is less than or equal to Emax, then the current SOC0 is less than or equal to the SOC with I1 as the safe charging current threshold. Since the battery's SOC and the safe charging current threshold are negatively correlated, I1 is less than the safe charging current threshold for the current SOC, making the current charging safe and requiring no adjustment of the charging strategy.

[0081] In this embodiment, when the battery is charging, the current charging current and current voltage of the battery, as well as the preset safe voltage threshold corresponding to the current charging current, can be directly obtained. Then, the charging strategy information of the battery is determined based on the current voltage and the preset safe voltage threshold. Therefore, the charging strategy can be adjusted in real time based on the current voltage. Since the battery voltage can be accurately obtained, dynamically adjusting the battery charging current based on the voltage ensures charging safety.

[0082] According to some embodiments of this application, the charging strategy information includes a target charging current, and the control method further includes:

[0083] Step S104: Perform a charging control operation based on the target charging current to continue charging the battery with the target charging current.

[0084] In this embodiment of the application, the target charging current is the battery charging current adjusted in real time, and the battery charging strategy is to continue charging the battery with the target charging current.

[0085] In this embodiment of the application, the target charging current after real-time adjustment may be the same as or different from the current charging current.

[0086] In this embodiment, by adjusting the charging current in real time based on the current voltage and using the adjusted target charging current to charge the battery, charging safety can be guaranteed and safety hazards are less likely to be caused compared to directly charging the battery with the current charging current.

[0087] According to some embodiments of this application, Figure 5 For flowcharts of battery charging control methods according to some embodiments of this application, see [link to flowchart]. Figure 5 The method includes:

[0088] Step S201: Obtain the current charging current and current voltage of the battery.

[0089] Step S202: Obtain the preset safe voltage threshold of the battery corresponding to the current charging current.

[0090] Step S203: In response to determining that the current voltage is greater than a preset safe voltage threshold, the target charging current is determined.

[0091] The target charging current is less than the current charging current.

[0092] In other words, based on the current voltage and the preset safe voltage threshold, the battery charging strategy information is determined as follows: in response to determining that the current voltage is greater than the preset safe voltage threshold, the target charging current is determined.

[0093] In the embodiments of this application, steps S101 and S201 are the same, and steps S102 and S202 are the same, which will not be repeated here.

[0094] If the current voltage is greater than the preset safe voltage threshold corresponding to the current charging current, it indicates that there is a risk of unsafe charging. Therefore, the charging current of the battery is reduced to continue charging.

[0095] In this embodiment, when the current voltage is greater than the preset safe voltage threshold, it indicates that the current charging current of the battery is too high. By adjusting the charging strategy in real time, charging safety can be ensured and potential safety hazards can be avoided.

[0096] According to some embodiments of this application, see Figure 6 , Figure 6 A flowchart of a battery charging control method according to some embodiments of this application is provided, step 203 including:

[0097] Step 231: Reduce the battery charging current to the transition charging current.

[0098] Step 232: Obtain the transition voltage of the battery when it is being charged using the transition charging current.

[0099] Step 233: Obtain the transition safety voltage threshold of the battery corresponding to the transition charging current.

[0100] Step 234: In response to determining that the transition voltage is greater than the transition safety voltage threshold, the charging current of the battery is reduced again.

[0101] In this embodiment, when the current voltage exceeds a preset safe voltage threshold, it indicates that the current charging current of the battery is too high and needs to be reduced. When the battery charging current decreases to the transition charging current, the transition safe voltage threshold corresponding to the transition charging current needs to be obtained from the battery management system. Then, the battery charging strategy is adjusted by comparing the transition voltage and the transition safe voltage threshold. If the transition voltage is still greater than the transition safe voltage threshold, the battery charging current needs to be reduced again until the corresponding battery voltage is less than the voltage threshold corresponding to the current charging current, indicating that the battery charging current is safe at this point.

[0102] In this embodiment, the battery charging strategy is adjusted by reducing the battery charging current to avoid excessive charging current and potential safety hazards.

[0103] According to some embodiments of this application, see Figure 7 , Figure 7 This is a flowchart of a battery charging control method according to some embodiments of this application. Step 203 further includes:

[0104] In step S235, in response to determining that the transition voltage is less than or equal to the transition safety voltage threshold, the transition charging current is determined as the target charging current.

[0105] In this embodiment of the application, when the charging current of the battery is reduced to the transition charging current, the transition voltage of the battery during the transition charging is obtained. If the transition voltage is less than or equal to the transition safety voltage threshold, it indicates that the charging is safe at this time, and there is no need to further reduce the charging current of the battery to continue charging the battery with the transition charging current.

[0106] In this embodiment of the application, if the battery is already in a safe charging state (i.e., the current voltage is less than or equal to the safe voltage threshold corresponding to the current charging current) after the charging current of the battery is reduced, there is no need to further reduce the charging current of the battery. This can ensure the safety performance of the battery and avoid low charging efficiency due to the charging current being too small.

[0107] According to some embodiments of this application, see Figure 5 The method also includes:

[0108] Step 204: In response to determining that the current voltage is less than or equal to a preset safe voltage threshold, the current charging current is determined as the target charging current.

[0109] In this embodiment of the application, when the current voltage of the battery is less than or equal to the preset safe voltage threshold corresponding to the current current, it indicates that the battery is safe to charge at this time, and there is no need to reduce the charging current of the battery. The current charging current can be determined as the target charging current to charge the battery.

[0110] In the embodiments of this application, when the battery is in a safe state (i.e., the current voltage is less than or equal to the safe voltage threshold corresponding to the current charging current), the charging current of the battery is not reduced. This ensures the charging safety of the battery and avoids the charging efficiency being affected by the excessively low charging current caused by further reduction in the charging current.

[0111] According to some embodiments of this application, the current charging current and current voltage can be obtained from the battery management system.

[0112] Obtaining the current charging current and current voltage from the battery's battery management system is faster and more convenient.

[0113] According to some embodiments of this application, see again Figure 5 The control method also includes:

[0114] Step 205: Obtain the safe voltage threshold corresponding to each of the multiple safe charging current thresholds.

[0115] Step 206: Store the one-to-one mapping relationship between multiple safe charging current thresholds and multiple safe voltage thresholds to obtain a mapping table. The preset safe voltage threshold is obtained from the mapping table based on the current charging current.

[0116] In this embodiment, the battery management system can store a one-to-one mapping relationship between multiple safe charging current thresholds and multiple safe voltage thresholds, i.e., a mapping table. After obtaining the current charging current of the battery, the preset safe voltage threshold corresponding to the current charging current can be easily obtained from the mapping table.

[0117] In some embodiments, the mapping table can be stored in the battery management system.

[0118] In this embodiment of the application, a mapping table between multiple safe charging current thresholds and multiple safe voltage thresholds is stored in the battery management system. By pre-establishing the mapping relationship between safe charging current thresholds and safe voltage thresholds, the safe voltage threshold corresponding to the current can be easily obtained from the mapping table.

[0119] According to some embodiments of this application, Figure 8 For flowcharts of battery charging control methods according to some embodiments of this application, see [link to flowchart]. Figure 8 Step 205 includes:

[0120] Step 251: Charge the experimental battery with any one of the multiple safe charging current thresholds, and charge the experimental battery to the state of charge corresponding to the safe charging current threshold.

[0121] Step 252: Obtain the voltage of the experimental battery in the state of charge and record it as the safe voltage threshold.

[0122] In this embodiment, the mapping table can be obtained experimentally. The experimental battery is charged, and the battery voltage at which it reaches the corresponding state of charge (SOC) when charged to a safe charging current threshold is accurately measured. This SOC is the safe voltage threshold for the battery at that SOC. Since the SOC can be precisely controlled during the experiment, it is more accurate than obtaining it during charging, with virtually no error. Therefore, the resulting mapping table is highly accurate and can be stored in the battery management system for later use.

[0123] It should be noted that the experimental battery and the battery under test are of the same model to ensure that the mapping table obtained through the experiment can be applied to the battery under test.

[0124] In this embodiment of the application, the mapping table obtained through experiments is a combination of multiple safe charging current thresholds and multiple safe voltage thresholds. The current charging current detected in the battery charging control method may not be directly read from the mapping table. In this case, a fitted mapping table can be obtained by performing a certain digital fitting on the mapping table, and the current charging current can be read from the fitted mapping table.

[0125] In this embodiment of the application, the state of charge obtained through experiments is more accurate, and the resulting mapping table is more accurate and easier to use in subsequent applications.

[0126] Figure 9 A block diagram of a battery charging control device for some embodiments of this application is shown below. Figure 9 This application provides a battery charging control device, which includes a first acquisition module 301, a second acquisition module 302, and a determination module 303. The first acquisition module 301 is configured to acquire the current charging current and current voltage of the battery; the second acquisition module 302 is configured to acquire a preset safe voltage threshold corresponding to the current charging current of the battery; and the determination module 303 is configured to determine the battery charging strategy information based on the current voltage and the preset safe voltage threshold.

[0127] According to some embodiments of this application, the charging strategy information includes a target charging current. Figure 10 See also the block diagram of the battery charging control device for other embodiments of this application. Figure 10 The device also includes a control module 304, which is configured to perform a charging control operation based on a target charging current, so that the battery continues to be charged at the target charging current.

[0128] According to some embodiments of this application, see again Figure 10 The control module 304 includes a first sub-determination module 341, which is configured to determine a target charging current in response to determining that the current voltage is greater than a preset safe voltage threshold, wherein the target charging current is less than the current charging current.

[0129] According to some embodiments of this application, the first sub-determination module 341 is further configured to: reduce the charging current of the battery to a transition charging current; obtain the transition voltage of the battery when it is charged using the transition charging current; obtain the transition safety voltage threshold of the battery corresponding to the transition charging current; and, in response to determining that the transition voltage is greater than the transition safety voltage threshold, reduce the charging current of the battery again.

[0130] According to some embodiments of this application, the first sub-determination module 341 is further configured to: determine the transition charging current as the target charging current in response to determining that the transition voltage is less than or equal to the transition safety voltage threshold.

[0131] According to some embodiments of this application, see again Figure 10 The control module 304 includes a second sub-determination module 342, which is configured to determine the current charging current as the target charging current in response to determining that the current voltage is less than or equal to a preset safe voltage threshold.

[0132] According to some embodiments of this application, the first acquisition module 301 is configured to acquire the current charging current and the current voltage from the battery management system.

[0133] According to some embodiments of this application, see again Figure 10The device further includes a third acquisition module 305 and a storage module 306. The third acquisition module 305 is configured to acquire the safe voltage threshold corresponding to each of the multiple safe charging current thresholds; the storage module 306 is configured to store the one-to-one mapping relationship between the multiple safe charging current thresholds and the multiple safe voltage thresholds to obtain a mapping table. The preset safe voltage threshold is obtained from the mapping table based on the current charging current.

[0134] According to some embodiments of this application, the third acquisition module 305 is further configured to: charge the experimental battery with any one of a plurality of safe charging current thresholds, and charge the experimental battery to the state of charge corresponding to the safe charging current threshold; and acquire the voltage of the experimental battery in the state of charge as the safe voltage threshold.

[0135] Specific limitations regarding the battery charging control device can be found in the limitations of the battery charging control method described above, and will not be repeated here. Each module in the aforementioned battery charging control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in the electronic device in hardware form, or stored in the memory of the electronic device in software form, so that the processor can call and execute the corresponding operations of each module.

[0136] According to some embodiments of this application, this application also provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform any of the battery charging control methods described in the above embodiments.

[0137] According to some embodiments of this application, a battery management system includes the electronic device described in the above embodiments.

[0138] The battery management system provided in this application can directly acquire the current charging current and current voltage of the battery, as well as a preset safe voltage threshold corresponding to the current charging current, during battery charging. Then, it determines the battery charging strategy based on the current voltage and the preset safe voltage threshold. This process does not involve the battery's state of charge (SOC), thus avoiding battery safety issues caused by inaccurate SOC calculations.

[0139] According to some embodiments of this application, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements any of the battery charging control methods described in the above embodiments. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device, etc.

[0140] According to some embodiments of this application, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the battery charging control method of any of the above embodiments. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, some or all of the above methods can be implemented, in whole or in part, according to the processes or functions described in the embodiments of this application.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for controlling battery charging, characterized in that, include: Obtain the current charging current and current voltage of the battery; Obtain the preset safe voltage threshold of the battery corresponding to the current charging current; as well as Based on the current voltage and the preset safe voltage threshold, determine the charging strategy information for the battery; The preset safe voltage threshold is the maximum voltage that makes the current charging current less than a first value at each moment, where the first value is the safe charging current threshold under the state of charge of the battery. The method further includes: Obtain the corresponding safe voltage threshold for each of the multiple safe charging current thresholds; and Store the one-to-one mapping relationship between the multiple safe charging current thresholds and the multiple safe voltage thresholds to obtain a mapping table. The preset safe voltage threshold is obtained from the mapping table based on the current charging current.

2. The method according to claim 1, characterized in that, The charging strategy information includes the target charging current, and the method further includes: A charging control operation is performed based on the target charging current, so that the battery continues to be charged at the target charging current.

3. The method according to claim 2, characterized in that, Based on the current voltage and the preset safe voltage threshold, the charging strategy information of the battery is determined, including: In response to determining that the current voltage is greater than the preset safe voltage threshold, a target charging current is determined, wherein the target charging current is less than the current charging current.

4. The method according to claim 3, characterized in that, In response to determining that the current voltage is greater than the preset safe voltage threshold, the target charging current is determined, including: Reduce the charging current of the battery to an overcharge current; Obtain the transition voltage of the battery when it is charged using the transition charging current; Obtain the transition safety voltage threshold of the battery corresponding to the transition charging current; In response to determining that the transition voltage is greater than the transition safety voltage threshold, the charging current of the battery is reduced again.

5. The method according to claim 4, characterized in that, In response to determining that the current voltage is greater than the preset safe voltage threshold, the target charging current is determined, including: In response to determining that the transition voltage is less than or equal to the transition safety voltage threshold, the transition charging current is determined as the target charging current.

6. The method according to claim 2, characterized in that, Based on the current voltage and the preset safe voltage threshold, a charging strategy for the battery is determined, including: In response to determining that the current voltage is less than or equal to the preset safe voltage threshold, the current charging current is determined as the target charging current.

7. The method according to any one of claims 1 to 6, characterized in that, Obtaining the current charging current and current voltage of the battery includes: Obtain the current charging current and the current voltage from the battery management system.

8. The method according to claim 1, characterized in that, The safe voltage thresholds corresponding to the multiple safe charging current thresholds include: The experimental battery is charged with any one of the plurality of safe charging current thresholds, and the experimental battery is charged to the state of charge corresponding to the safe charging current threshold. The voltage of the experimental battery under the charged state is recorded as the safe voltage threshold.

9. A battery charging control device, characterized in that, include: The first acquisition module (301) is configured to acquire the current charging current and current voltage of the battery; The second acquisition module (302) is configured to acquire a preset safe voltage threshold of the battery corresponding to the current charging current; as well as The determining module (303) is configured to determine the charging strategy information of the battery based on the current voltage and the preset safe voltage threshold. The preset safe voltage threshold is the maximum voltage that makes the current charging current less than a first value at each moment, where the first value is the safe charging current threshold under the state of charge of the battery. The control device further includes: The third acquisition module (305) and the storage module (306) are configured to acquire the safe voltage threshold corresponding to each of the multiple safe charging current thresholds; the storage module (306) is configured to store the one-to-one mapping relationship between the multiple safe charging current thresholds and the multiple safe voltage thresholds to obtain a mapping table, wherein the preset safe voltage threshold is obtained from the mapping table based on the current charging current.

10. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the battery charging control method as described in any one of claims 1 to 8.

11. A battery management system, characterized in that, Includes the electronic device as described in claim 10.

12. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the battery charging control method according to any one of claims 1 to 8.

13. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the battery charging control method according to any one of claims 1 to 8.

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