Control methods for battery devices, battery management systems, battery systems and electrical equipment

Abstract

This application provides a control method for a battery device, a battery management system, a battery system, and an electrical device. The control method includes: acquiring first parameters of the battery device, the first parameters including continuous current and / or power, and a required rate of decrease of allowable current and / or power; acquiring second parameters of the battery device, the second parameters including an allowable excess discharge capacity, which includes an additional discharge capacity of the battery device exceeding the continuous current and / or power; and adjusting the allowable current and / or power of the battery device discharge based on the first and second parameters. The control method, battery management system, battery system, and electrical device provided in this application can improve the performance and lifespan of the battery device and enhance the user experience.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a control method for a battery device, a battery management system, a battery system, and an electrical device. Background Technology

[0002] Due to their advantages such as high energy density, rechargeability, safety and environmental friendliness, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0003] Currently, the discharge cutoff condition for battery devices is typically limited by voltage, such as a discharge cutoff voltage. For example, when the battery reaches the discharge cutoff voltage, it stops discharging, thereby reducing the risk of over-discharge and improving the performance of the battery device.

[0004] For battery devices with a long open circuit voltage (OCV) curve plateau region and a very rapid voltage change when exiting the plateau region, such as battery devices without a negative electrode, if the above method is used for discharge, the rapid voltage change after the battery device exits the plateau region (such as the rapid voltage drop as the SOC decreases after exiting the plateau region) and the certain delay in system control can easily cause such battery devices to discharge beyond the discharge cutoff condition, resulting in over-discharge of the battery device, affecting the performance and lifespan of the battery device, and also reducing the user experience. Summary of the Invention

[0005] This application provides a control method for a battery device, a battery management system, a battery system, and an electrical device, which can improve the performance and lifespan of the battery device and enhance the user experience.

[0006] In a first aspect, a method for controlling a battery device is provided, the method comprising: acquiring a first parameter of the battery device, the first parameter including a continuous current and / or power, and a required rate of decrease of an allowable current and / or power; acquiring a second parameter of the battery device, the second parameter including an allowable excess discharge capacity, the allowable excess discharge capacity including an additional discharge capacity of the battery device exceeding the continuous current and / or power; and controlling the adjustment of the allowable current and / or power of the battery device discharge based on the first parameter and the second parameter.

[0007] In this embodiment, the allowable current and / or power of the battery device can be adjusted based on the continuous current and / or power of the battery device, the required rate of decrease of the allowable current and / or power, and the excess discharge capacity. This reduces the risk of over-discharge of the battery device and improves battery performance and lifespan. Furthermore, it reduces the likelihood of the battery device suddenly failing to meet the usage needs of the electrical equipment, thus enhancing the user experience.

[0008] In one possible implementation, the first parameter also includes peak current and / or power.

[0009] In the embodiments of this application, the allowable current and / or power of the battery device can be adjusted according to the continuous current and / or power of the battery device, the required rate of decrease of the allowable current and / or power, the peak current and / or power, and the excess discharge capacity. This can reduce the risk of the allowable current and / or power of the battery device exceeding the peak current and / or power during the discharge process, thereby improving the performance and service life of the battery device.

[0010] In one possible implementation, controlling the adjustment of the allowable current and / or power of the battery device discharge according to a first parameter and a second parameter includes: determining a target current and / or power of the battery device based on the discharge excess capacity, the continuous current and / or power, and the required rate of decrease; and controlling the adjustment of the allowable current and / or power of the battery device discharge according to the smaller of the target current and / or power and the peak current and / or power.

[0011] In this embodiment, the target current and / or power of the battery device can be determined first based on the excess discharge capacity, continuous current and / or power, and the required rate of decrease of the allowable current and / or power. Then, the smaller of the target current and / or power and the peak current and / or power is taken as the allowable current and / or power of the battery device. This can reduce the risk of the allowable current and / or power exceeding the peak current and / or power, and improve the performance and lifespan of the battery device.

[0012] In one possible implementation, determining the target current and / or power of the battery device based on the discharge excess capacity, continuous current and / or power, and the required rate of decay includes: ,in, For target current and / or power, To achieve the required descent rate, To allow for the discharge of excess power, For continuous current and / or power.

[0013] In this embodiment, the dissipable excess power can be converted into the area of ​​a triangle, the slope of the hypotenuse of the triangle is the required descent rate, and the height of the triangle is the difference between the target current and / or power and the continuous current and / or power. In this way, the target current and / or power can be reasonably determined.

[0014] In one possible implementation, before acquiring the second parameter of the battery device, the control method further includes: acquiring a third parameter of the battery device, the third parameter including actual current and / or power, the time corresponding to the actual current and / or power, and the peak time corresponding to the peak current and / or power, wherein the actual current and / or power is the current and / or power at which the battery device discharges under continuous current and / or power and peak current and / or power and is greater than the continuous current and / or power; and determining the excess discharge capacity based on the peak current and / or power, continuous current and / or power, and the third parameter.

[0015] In this embodiment, the allowable excess discharge capacity of the battery device can be determined in real time based on the peak current and / or power, continuous current and / or power, actual current and / or power, the time corresponding to the actual current and / or power, and the peak time corresponding to the peak current and / or power. This allows for real-time control of the allowable discharge current and / or power of the battery device based on the allowable excess discharge capacity, reducing the risk of over-discharge and improving the performance and lifespan of the battery device. Furthermore, it can reduce situations where the battery device suddenly fails to meet the usage needs of electrical equipment, thus improving the user experience.

[0016] In one possible implementation, determining the dischargeable excess capacity based on peak current and / or power, continuous current and / or power, and a third parameter includes: determining the total discharge excess capacity of the battery device under peak current and / or power and continuous current and / or power based on peak current and / or power, continuous current and / or power, and peak time; determining the already discharged excess capacity of the battery device based on actual current and / or power, the time corresponding to actual current and / or power, and continuous current and / or power; and determining the dischargeable excess capacity based on the total discharge excess capacity and the already discharged excess capacity.

[0017] In the embodiments of this application, the total excess discharge capacity and the discharged excess capacity can be determined when the battery device discharges during the stages between two sets of peak current and / or power and between continuous current and / or power. Then, based on the total excess discharge capacity and the discharged excess capacity, the real-time dischargeable excess capacity of the battery device in each stage can be determined, thereby enabling the real-time determination of the allowable current and / or power of the battery device. This allows for reasonable adjustment of the allowable current and / or power, reducing the risk of over-discharge of the battery device.

[0018] In one possible implementation, determining the total excess discharge capacity of the battery device at peak current and / or power, and continuous current and / or power, based on peak current and / or power, continuous current and / or power, and peak time, includes: ,in, To discharge excess power, For peak current and / or power, For continuous current and / or power, This is the peak time.

[0019] In the embodiments of this application, the total excess discharge capacity of the battery device can be reasonably determined according to the above formula, thereby reasonably determining the excess discharge capacity of the battery device, and further reasonably controlling the allowable current and / or power of the battery device, reducing the risk of over-discharge of the battery device.

[0020] In one possible implementation, determining the excess charge discharged by the battery device based on the actual current and / or power, the time corresponding to the actual current and / or power, and the continuous current and / or power includes: ,in, Excess power has been discharged. For actual current and / or power, For continuous current and / or power, The time corresponding to the actual current and / or power.

[0021] In the embodiments of this application, the excess charge discharged by the battery device during the discharge of the battery device in the stages between two sets of peak current and / or power and continuous current and / or power can be reasonably determined according to the above formula. This allows for a reasonable determination of the excess charge that the battery device can discharge, and in turn, it enables reasonable control of the allowable current and / or power adjustment of the battery device discharge, thereby reducing the risk of over-discharge of the battery device.

[0022] In one possible implementation, the battery device includes a negative electrode-free battery.

[0023] In this embodiment, the allowable current and / or power of the negative electrode-free battery can be reasonably controlled based on its continuous current and / or power, the required rate of decrease of allowable current and / or power, and the excess discharge capacity. This reduces the risk of over-discharge and improves the performance and lifespan of the negative electrode-free battery. Furthermore, it reduces situations where the negative electrode-free battery suddenly fails to meet the usage needs of electrical equipment, thus enhancing the user experience.

[0024] In a second aspect, a battery management system is provided, comprising: an acquisition unit for acquiring first parameters of a battery device, the first parameters including continuous current and / or power, and a required rate of decrease of allowable current and / or power; and acquiring second parameters of the battery device, the second parameters including dischargeable excess capacity, the dischargeable excess capacity including an additional dischargeable amount of the battery device exceeding the continuous current and / or power; and a control unit for controlling the adjustment of the allowable current and / or power of the battery device discharge based on the first and second parameters.

[0025] In one possible implementation, the acquisition unit is specifically used to acquire a second parameter of the battery device discharge, wherein the dischargeable excess capacity includes the dischargeable excess capacity.

[0026] In one possible implementation, the first parameter also includes peak current and / or power.

[0027] In one possible implementation, the control unit is specifically configured to determine the target current and / or power of the battery device based on the discharge excess capacity, continuous current and / or power, and the required rate of decay; and to control the adjustment of the allowable current and / or power of the battery device discharge based on the smaller of the target current and / or power and the peak current and / or power.

[0028] In one possible implementation, the control unit is specifically configured to determine the target current and / or power according to the following formula: ,in, For target current and / or power, To achieve the required descent rate, To allow for the discharge of excess power, For continuous current and / or power.

[0029] In one possible implementation, the acquisition unit is further configured to acquire a third parameter of the battery device, the third parameter including actual current and / or power, time corresponding to actual current and / or power, and peak time corresponding to peak current and / or power, wherein actual current and / or power is the current and / or power of the battery device discharging under continuous current and / or power and peak current and / or power that is greater than continuous current and / or power; the control unit is further configured to determine the excess discharge capacity based on peak current and / or power, continuous current and / or power, and the third parameter.

[0030] In one possible implementation, the control unit is specifically configured to: determine the total excess charge discharged by the battery device at the peak current and / or power, and the continuous current and / or power, based on the peak current and / or power, the continuous current and / or power, and the peak time; determine the excess charge already discharged by the battery device based on the actual current and / or power, the time corresponding to the actual current and / or power, and the continuous current and / or power; and determine the excess charge that can be discharged based on the total excess charge and the excess charge already discharged.

[0031] In one possible implementation, the control unit is specifically configured to determine the total excess discharge capacity according to the following formula: ,in, To discharge excess power, For peak current and / or power, For continuous current and / or power, This is the peak time.

[0032] In one possible implementation, the control unit is specifically configured to determine the excess charge discharged according to the following formula: ,in, Excess power has been discharged. For actual current and / or power, For continuous current and / or power, The time corresponding to the actual current and / or power.

[0033] In one possible implementation, the battery device includes a negative electrode-free battery.

[0034] Thirdly, a battery management system is provided, comprising a memory and a processor, wherein the memory is used to store instructions, and the processor is used to read the instructions and execute control methods as described in the first aspect and any possible implementation thereof.

[0035] Fourthly, a battery system is provided, the battery system including a battery device and a battery management system as in any possible implementation of the second or third aspect.

[0036] Fifthly, an electrical device is provided, the electrical device including a load; and a battery system as described in the fourth aspect, the battery system being connected to the load for supplying power to the load.

[0037] In a sixth aspect, an electrical device is provided, comprising a first load; a second load; and a battery system as described in the fourth aspect, the battery system being connected to the first load for providing a first direct current to the first load, and the battery system being connected to the second load for providing a second direct current to the second load, wherein the voltage of the first direct current is greater than the voltage of the second direct current.

[0038] In a seventh aspect, a chip is provided, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform a control method as described in the first aspect and any possible implementation thereof.

[0039] Eighthly, a computer program is provided that, when executed by a computer, causes the computer to implement the control method as described in the first aspect and any possible implementation thereof.

[0040] Ninth aspect, a computer-readable storage medium is provided for storing a computer program, which, when executed by a computer, causes the computer to implement the control method as described in the first aspect and any possible implementation thereof.

[0041] In a tenth aspect, a computer program product is provided, including computer program instructions that, when executed by a computer, cause the computer to implement the control method as described in the first aspect and any possible implementation thereof. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a vehicle to which the embodiments of this application apply.

[0043] Figure 2 This is a schematic flowchart illustrating the control method of the battery device provided in an embodiment of this application.

[0044] Figure 3 This is another schematic flowchart illustrating the control method of the battery device provided in the embodiments of this application.

[0045] Figure 4 This is a schematic diagram illustrating the excess charge that the battery device provided in the embodiments of this application can hold.

[0046] Figure 5 This is another schematic flowchart illustrating the control method of the battery device provided in the embodiments of this application.

[0047] Figure 6 This is a flowchart illustrating a method for determining the allowable excess power capacity provided in an embodiment of this application.

[0048] Figure 7 This is a schematic diagram illustrating the total excess discharge capacity, the excess discharge capacity already discharged, and the excess discharge capacity that can be discharged, provided for embodiments of this application.

[0049] Figure 8 This is a schematic block diagram of the battery management system provided in the embodiments of this application.

[0050] Figure 9 This is another schematic block diagram of the battery management system provided in the embodiments of this application. Detailed Implementation

[0051] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0052] 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, "a plurality of" means two or more, unless otherwise explicitly defined. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application, are intended to cover non-exclusive inclusion.

[0053] 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 alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0054] 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.

[0055] In this application, the terms "upper," "lower," "left," "right," "inner," and "outer," indicating orientation or positional relationships, are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0056] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] Due to their advantages such as high energy density, rechargeability, safety and environmental friendliness, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0058] Currently, the discharge cutoff condition for battery devices is typically limited by voltage, such as a discharge cutoff voltage. For example, when a battery device reaches the discharge cutoff voltage, it stops discharging, thereby reducing the risk of over-discharge and improving the performance of the battery device.

[0059] For battery devices with a long OCV curve plateau region and a very rapid voltage change when exiting the plateau region, if there is no negative electrode battery, and the battery device is discharged in the above way, the voltage drops rapidly as the SOC decreases after exiting the plateau region, and the system control has a certain delay. This can easily cause the battery device to discharge beyond the discharge cutoff condition, resulting in over-discharge of the battery device, which will affect the performance and service life of the battery device.

[0060] On the other hand, due to the rapid voltage drop in the platform area, the battery may suddenly be unable to meet the power demand of the electrical equipment, which may cause the electrical equipment to suddenly malfunction, such as a vehicle pressing the accelerator pedal but failing to accelerate, or even causing the electrical equipment to suddenly shut down, affecting the user experience.

[0061] In view of this, embodiments of this application provide a control method for a battery device, a battery management system, a battery system, and an electrical device. The control method includes: determining a first parameter of the battery device, the first parameter including continuous current and / or power, peak current and / or power, and a required rate of decrease of allowable current and / or power; determining a second parameter of the battery device, the second parameter including an allowable excess discharge capacity, the allowable excess discharge capacity including an additional discharge capacity of the battery device exceeding the continuous current and / or power; and determining the allowable current and / or power of the battery device based on the first parameter and the second parameter.

[0062] The battery device control method, battery management system, battery system, and electrical equipment provided in this application can improve the performance and lifespan of the battery device and enhance the user experience.

[0063] The technical solutions described in the embodiments of this application are applicable to various devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0064] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all illustrated using vehicles as an example.

[0065] Figure 1 This is a schematic diagram of a vehicle provided in an embodiment of this application.

[0066] Vehicle 1 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 motor 40, a controller 30, and a battery system 10 can be installed inside vehicle 1. The controller 30 manages the power supply from the battery system 10 to the motor 40. For example, the battery system 10 can be installed at the bottom, front, or rear of vehicle 1.

[0067] The battery system 10 can be used to power the vehicle 1. In some embodiments, the battery system 10 can serve as the operating power source for the vehicle 1, for example, for the power needs of the vehicle 1 during startup, navigation, and operation.

[0068] In some embodiments, the battery system 10 can also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0069] To meet different power demands, the battery system 10 may include multiple battery cells, which can be connected in series, parallel, or a combination thereof. For example, multiple battery cells can first be connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form a battery device. In other words, multiple battery cells can directly form a battery device, or they can first be formed into battery modules, and then the battery modules can be formed into a battery device.

[0070] The battery system 10 may also include a battery management system, which can be used to monitor the state parameters of the battery device, such as current, voltage, state of charge (SOC), and temperature, in order to control the charging and discharging of the battery device.

[0071] The following combination Figures 2 to 7 The control method of the battery device provided in the embodiments of this application will be described by way of example.

[0072] Figure 2 This is a schematic flowchart illustrating the control method of the battery device provided in an embodiment of this application.

[0073] 210, Obtain the first parameters of the battery device.

[0074] The first parameter includes the continuous current and / or power, and the required rate of decrease of the allowable current and / or power.

[0075] Continuous current and / or power refer to the power provided by a battery device over a long period of time. The continuous current and / or power of a battery device vary with the state of the battery device, such as state of charge (SOC) and / or temperature.

[0076] As an example, the continuous current and / or power of the battery device can be obtained by looking up the correspondence table of SOC-temperature-continuous current and / or power. For example, when the SOC of the battery device is SOC1 and the temperature is T1, the continuous current and / or power of the battery device is continuous current and / or power 1.

[0077] Optionally, the continuous power of the battery device can be obtained by referring to the SOC-temperature-continuous power correspondence table. The continuous current of the battery device can be calculated based on the continuous power.

[0078] The rate of decrease of the allowable current and / or power requirements refers to the rate of change in the allowable current and / or power requirements of the battery device. For example, for discharge, this rate of decrease is the rate of decrease of the allowable current and / or power required by the electrical equipment such as an electric vehicle, enabling smooth driving of the electric vehicle, such as smooth deceleration.

[0079] Permissible current and / or power refers to the maximum current and / or power allowed by the battery device.

[0080] 220, Obtain the second parameter of the battery device.

[0081] The second parameter includes the discharge capacity, which includes the additional discharge capacity of the battery device beyond the base capacity corresponding to the continuous current and / or power.

[0082] The amount of excess charge that can be discharged can vary with changes in the battery device's SOC and / or temperature.

[0083] Excess discharge capacity refers to the additional, short-term discharge capacity of a battery device beyond its continuous current and / or power discharge, which does not pose a risk of over-discharge.

[0084] Electricity may include capacity (e.g., in Ah) and / or energy (e.g., in kWh).

[0085] 230, based on the first parameter and the second parameter, control the adjustment of the allowable current and / or power during battery discharge.

[0086] As an example, the allowable current and / or power of the battery device can be adjusted according to the first parameter and the second parameter throughout the entire discharge process of the battery device.

[0087] Alternatively, when the battery device is discharging and the State of Charge (SOC) is less than or equal to a certain threshold (e.g., this threshold is greater than or equal to the lower limit of SOC corresponding to the plateau region), the allowable current and / or power of the battery device can be adjusted according to the first and second parameters. When the SOC is greater than the certain threshold, other methods can be used, such as adjusting the allowable current and / or power of the battery device solely based on the battery device voltage (e.g., there is a correlation between voltage and allowable current and / or power). For example, if the plateau region of the battery device is 10% to 90%, during discharge, the allowable current and / or power of the battery device can be adjusted according to the first and second parameters within the range where the SOC is less than or equal to 15% (or 20%); within the range where the SOC is greater than 15% (or 20%), the allowable current and / or power of the battery device can be adjusted using the battery device voltage.

[0088] As an example, the allowable discharge current of the battery device can be controlled based on the continuous current, the rate of decrease of the allowable current requirement, and the discharge excess capacity.

[0089] As another example, the allowable power of the battery device can be controlled based on the continuous power, the rate of decrease of the allowable power requirement, and the excess energy that can be discharged.

[0090] As an example, the continuous current and / or power can be the continuous current and / or power corresponding to the discharge of the battery device, i.e., the continuous discharge current and / or power. The allowable current and / or power can be the allowable current and / or power corresponding to the discharge of the battery device, i.e., the allowable discharge current and / or power.

[0091] In this embodiment, the allowable discharge current and / or power of the battery device can be adjusted based on the continuous current and / or power of the battery device, the required rate of decrease of the allowable current and / or power, and the excess discharge capacity. This reduces the risk of over-discharge of the battery device and improves its performance and lifespan. Furthermore, it reduces the likelihood of the battery device suddenly failing to meet the usage needs of the electrical equipment, thus enhancing the user experience.

[0092] In some cases, the allowable current and / or power determined based on the first and second parameters are relatively small and will not exceed the peak current and / or power.

[0093] For example, during discharge and when the SOC is low, the excess discharge capacity of the battery device is relatively small. If the rate of decrease in the allowable current and / or power requirements is also relatively small, then the determined allowable discharge current and / or power will also be relatively small, not exceeding the peak current and / or power of the battery device.

[0094] In some cases, the allowable current and / or power determined based on the first and second parameters may be large, potentially exceeding the peak current and / or power.

[0095] For example, when the state of charge (SOC) is high during discharge, the battery device can discharge a large amount of excess capacity, and the determined allowable current and / or power will be relatively large. If the rate of decrease of the required allowable current and / or power is also relatively large, then the determined allowable current and / or power will exceed the peak current and / or power.

[0096] Therefore, in some embodiments, the first parameter also includes peak current and / or power.

[0097] That is, in this embodiment, the allowable current and / or power of the battery device discharge can be adjusted according to the continuous current and / or power of the battery device, the required rate of decrease of the allowable current and / or power, the peak current and / or power, and the excess discharge capacity.

[0098] For example, the allowable discharge current and / or power of the battery device can be adjusted based on the continuous discharge current and / or power of the battery device, the required rate of decrease of the allowable current and / or power, the peak current and / or power, and the excess discharge capacity.

[0099] As an example, peak current and / or power can be the peak current and / or power corresponding to the discharge of the battery device, i.e., peak discharge current and / or power.

[0100] In the embodiments of this application, the allowable current and / or power of the battery device can be adjusted according to the continuous current and / or power of the battery device, the required rate of decrease of the allowable current and / or power, the peak current and / or power, and the excess discharge capacity. This can reduce the risk of the allowable current and / or power of the battery device exceeding the peak current and / or power during the discharge process, thereby improving the performance and service life of the battery device.

[0101] Continue to combine as follows Figure 3 A further exemplary description is provided of a control method for a battery device when the first parameter also includes peak current and / or power.

[0102] Figure 3 This is another schematic flowchart illustrating the control method of the battery device provided in the embodiments of this application.

[0103] 310, Obtain the first parameters of the battery device.

[0104] The first parameter includes the continuous current and / or power, and the required rate of decrease of the allowable current and / or power.

[0105] In some embodiments, the first parameter further includes peak current and / or power.

[0106] 320, Obtain the second parameter of the battery device.

[0107] The second parameter includes the discharge capacity, which includes the additional discharge capacity of the battery device beyond the continuous current and / or power.

[0108] The contents of steps 310 and 320 can be referred to the relevant descriptions of steps 210 and 220 above, and will not be repeated here in the embodiments of this application.

[0109] 330. Determine the target current and / or power of the battery device based on the battery device's discharge capacity, continuous current and / or power, and the required rate of decrease of the allowable current and / or power.

[0110] That is, in this embodiment, the target discharge current and / or power of the battery device can be determined based on the excess discharge capacity, continuous current and / or power of the battery device, and the required rate of decrease of the allowable current and / or power.

[0111] 340. The allowable current and / or power of the battery device discharge is adjusted based on the smaller of the target current and / or power, and the peak current and / or power.

[0112] It should be understood that, in this embodiment, when the target current and / or power is equal to the peak current and / or power, the allowable current and / or power of the battery device can be adjusted based on either of the two.

[0113] As an example, during the discharge of the battery device, the smaller of the target current and / or power and the peak current and / or power can be used as the allowable current and / or power for the battery device discharge. That is, the allowable current and / or power for the battery device discharge = min[target current and / or power, peak current and / or power].

[0114] In this embodiment, the target current and / or power of the battery device can be determined first based on the excess discharge capacity, continuous current and / or power, and the required rate of decrease of the allowable current and / or power. Then, the allowable current and / or power of the battery device can be adjusted based on the smaller of the target current and / or power and the peak current and / or power. This can reduce the risk of the allowable current and / or power exceeding the peak current and / or power, and improve the performance and lifespan of the battery device.

[0115] In some embodiments, the target current and / or power of the battery device can be determined according to the following formula.

[0116] ,

[0117] in, For target current and / or power, The required rate of decrease for allowable current and / or power, To allow for the discharge of excess power, For continuous current and / or power.

[0118] Since the allowable current and / or power decrease at the required rate of decrease, the excess charge that can be discharged can be achieved by using... Figure 4 The area of ​​the right triangle shown represents the required rate of descent, where the slope of the hypotenuse is the area of ​​the triangle. The height of this right triangle is the target current and / or power - continuous current and / or power. That is, .

[0119] In this embodiment, the dissipable excess power can be converted into the area of ​​a triangle, the slope of the hypotenuse of the triangle is the required descent rate, and the height of the triangle is the difference between the target current and / or power and the continuous current and / or power. In this way, the target current and / or power can be reasonably determined.

[0120] In some embodiments, before obtaining the second parameter of the battery device, namely the excess discharge capacity, it is also necessary to determine the excess discharge capacity of the battery device. This will continue in conjunction with... Figure 5 An exemplary method for controlling a battery device when determining the amount of excess charge that can be discharged is provided.

[0121] Figure 5 This is another schematic flowchart illustrating the control method of the battery device provided in the embodiments of this application.

[0122] 510, Obtain the first parameters of the battery device.

[0123] The first parameter includes the continuous current and / or power, and the required rate of decrease of the allowable current and / or power.

[0124] The content of step 510 can be referred to the relevant content of step 210 above, and will not be repeated here.

[0125] 520, obtain the third parameter of the battery device.

[0126] The third parameter includes the actual current and / or power, the time corresponding to the actual current and / or power, and the peak time corresponding to the peak current and / or power. The actual current and / or power is the current and / or power of the battery device discharging at the continuous current and / or power and the peak current and / or power, which is greater than the continuous current and / or power.

[0127] As an example, the peak current and / or power, and continuous current and / or power of a battery device change with state parameters such as SOC and / or temperature. For instance, when the SOC and temperature of the battery device are SOC1 and T1, respectively, the corresponding peak current and / or power is peak current and / or power 1, and the continuous current and / or power is continuous current and / or power 1. When the SOC and temperature of the battery device are SOC2 and T2 (e.g., the SOC decreases and the temperature increases), the corresponding peak current and / or power is peak current and / or power 2, and the continuous current and / or power is continuous current and / or power 2. Therefore, within the interval SOC2 < SOC ≤ SOC1 and T1 ≤ T < T2, the corresponding peak current and / or power of the battery device can be considered as peak current and / or power 1, and the corresponding continuous current and / or power can be considered as continuous current and / or power 2.

[0128] Therefore, within the interval SOC2<SOC≤SOC1、T1≤T<T2, the current and / or power greater than the continuous current and / or power during battery discharge, and the corresponding time, are the actual current and / or power and time of the battery device.

[0129] As an example, the peak current and / or power, continuous current and / or power of the battery device can be obtained by referring to the correspondence table of SOC-temperature-peak current and / or power, continuous current and / or power.

[0130] Peak time can refer to the time during which a battery device can continuously discharge at peak current and / or power without causing damage, overheating, or accelerated aging of the battery device.

[0131] 530. Determine the excess discharge capacity based on peak current and / or power, continuous current and / or power, and a third parameter.

[0132] That is, in this embodiment, the excess discharge capacity is determined based on the peak current and / or power, the continuous current and / or power, the actual current and / or power, the time corresponding to the actual current and / or power, and the peak time corresponding to the peak current and / or power.

[0133] As an example, when the battery device is discharging, the excess discharge capacity can be determined based on the peak current and / or power, the continuous current and / or power, the actual current and / or power, the discharge time corresponding to the actual current and / or power, and the peak time corresponding to the peak current and / or power.

[0134] In this embodiment, the allowable excess discharge capacity of the battery device can be determined in real time based on the peak current and / or power, continuous current and / or power, actual current and / or power, the time corresponding to the actual current and / or power, and the peak time corresponding to the peak current and / or power. This allows for real-time control of the allowable discharge current and / or power of the battery device based on the allowable excess discharge capacity, reducing the risk of over-discharge and improving the performance and lifespan of the battery device. Furthermore, it can reduce situations where electrical equipment suddenly fails to meet the usage requirements, thus improving the user experience.

[0135] Optionally, the peak time in steps 520 and 530 can be replaced with a preset time that is smaller than the peak time.

[0136] 540, Based on the first parameter and the second parameter, control the adjustment of the allowable current and / or power of the battery device discharge.

[0137] In some embodiments, the first parameter further includes the peak current and / or power of the battery device.

[0138] The content of step 540 can be found in the relevant content above, and will not be repeated here.

[0139] In some embodiments, determining the dischargeable excess capacity based on peak current and / or power, continuous current and / or power, and a third parameter includes: determining the total discharge excess capacity of the battery device under peak current and / or power and continuous current and / or power based on peak current and / or power, continuous current and / or power, and peak time; determining the already discharged excess capacity of the battery device based on actual current and / or power, the time corresponding to actual current and / or power, and continuous current and / or power; and determining the dischargeable excess capacity based on the total discharge excess capacity and the already discharged excess capacity. The following continues in conjunction with... Figure 6 The method for determining the excess capacity to be released is further illustrated by example.

[0140] Figure 6 This is a flowchart illustrating a method for determining the allowable excess power capacity provided in an embodiment of this application.

[0141] 610. Determine the total excess charge discharged by the battery device at the peak current and / or power, and the continuous current and / or power, based on the peak current and / or power, the continuous current and / or power, and the peak time.

[0142] As shown above, the peak current and / or power, continuous current and / or power of the battery device vary with parameters such as the state of charge (SOC) and / or temperature of the battery device.

[0143] When the battery device's State of Charge (SOC) and temperature are SOC1 and T1, respectively, the corresponding peak current and / or power are peak current and / or power 1, and the continuous current and / or power are continuous current and / or power 1. When the battery device's SOC and temperature are SOC2 and T2, respectively, the corresponding peak current and / or power are peak current and / or power 2, and the continuous current and / or power are continuous current and / or power 2. The peak current and / or power, as well as the continuous current and / or power, between two consecutive sets of SOC and / or temperature cannot be obtained by looking up tables. They can usually be approximated as the peak current and / or power, and the continuous current and / or power corresponding to SOC1 and T1. However, the peak current and / or power, and the continuous current and / or power, determined in this way between two consecutive sets of SOC and / or temperature are not very accurate, and therefore cannot accurately determine the excess capacity that the battery device can discharge between two consecutive sets of peak current and / or power, and continuous current and / or power.

[0144] Therefore, in this embodiment, the excess discharge capacity of the battery device at the current SOC and / or temperature (or the current peak current and / or power, and the continuous current and / or power) can be determined based on a set of peak currents and / or power, and continuous currents and / or power corresponding to the SOC and / or temperature. This excess discharge capacity is then used as the total excess discharge capacity for each stage (the stage between two consecutive sets of SOC and / or temperature, or the stage between two consecutive sets of peak currents and / or power, and the continuous current and / or power). Then, the excess discharge capacity actually released during discharge in each stage is determined, i.e., the already discharged excess discharge capacity. Finally, the total excess discharge capacity and the already discharged excess discharge capacity are used to determine the total excess discharge capacity of the battery device.

[0145] In some embodiments, the total excess capacity of the battery device can be determined using the following formula:

[0146] ,

[0147] in, To discharge excess power, For peak current and / or power, For continuous current and / or power, This is the peak time.

[0148] In the embodiments of this application, the total excess discharge capacity of the battery device can be reasonably determined according to the above formula, thereby reasonably determining the excess discharge capacity of the battery device, and further reasonably controlling the allowable current and / or power of the battery device, reducing the risk of over-discharge of the battery device.

[0149] Alternatively, the peak time in the formula can be replaced with a preset time that is smaller than the peak time.

[0150] 620. Determine the excess charge discharged by the battery device based on the actual current and / or power, the time corresponding to the actual current and / or power, and the continuous current and / or power.

[0151] That is, during the discharge process of the battery device, the excess charge discharged by the battery device can be determined based on the actual current and / or power of the battery device, the time corresponding to the discharge at the actual current and / or power, and the continuous current and / or power.

[0152] In some embodiments, the excess charge of the battery device can be determined according to the following formula:

[0153] ,

[0154] in, Excess power has been discharged. For actual current and / or power, For continuous current and / or power, The time corresponding to the actual current and / or power.

[0155] As an example, Excess power has been discharged. For the actual discharge current and / or power, For continuous discharge current and / or power, The time corresponding to the actual discharge current and / or power.

[0156] In the embodiments of this application, the excess charge discharged by the battery device during the discharge of the battery device in the stages between two sets of peak current and / or power and continuous current and / or power can be reasonably determined according to the above formula. This allows for a reasonable determination of the excess charge that the battery device can discharge, and in turn, it enables reasonable control of the allowable current and / or power adjustment of the battery device discharge, thereby reducing the risk of over-discharge of the battery device.

[0157] 630. Determine the amount of excess electricity that can be released based on the total excess electricity released and the excess electricity already released.

[0158] As an example, such as Figure 7 As shown, the difference between the total excess discharge capacity and the already discharged excess discharge capacity can be used as the excess discharge capacity that can be discharged.

[0159] In the embodiments of this application, the total excess discharge capacity and the discharged excess capacity can be determined when the battery device discharges during the stages between two sets of peak current and / or power and between continuous current and / or power. Then, based on the total excess discharge capacity and the discharged excess capacity, the real-time discharge capacity of the battery device in each stage can be determined, thereby enabling the real-time determination of the allowable current and / or power of the battery device. This allows for reasonable adjustment of the allowable current and / or power, reducing the risk of over-discharge of the battery device.

[0160] In some embodiments, the battery device includes a negative electrode-free battery device.

[0161] A negative electrode-free battery device can refer to a battery device that does not use traditional negative electrode active materials such as graphite and silicon, but only uses metals such as copper foil as negative electrode current collectors (i.e., no traditional active materials, only negative electrode current collectors), such as a negative electrode-free lithium metal battery device.

[0162] In negative electrode-free battery devices, the OCV curve shows a relatively long plateau region, such as 10% SOC to 90% SOC, and the voltage changes rapidly after exiting the plateau region. For example, when exiting the plateau region at the low SOC end, the voltage decreases rapidly as SOC decreases; when exiting the plateau region at the high SOC end, the voltage increases rapidly as SOC increases.

[0163] In this embodiment, the allowable current and / or power of the negative electrode-free battery device can be reasonably controlled based on the continuous current and / or power, the required rate of decrease of the allowable current and / or power, and the excess discharge capacity. This reduces the risk of over-discharge and improves the performance and lifespan of the negative electrode-free battery device. Furthermore, it reduces the likelihood of the negative electrode-free battery device suddenly failing to meet usage requirements, thus enhancing the user experience.

[0164] It should be understood that the control method for the battery device provided in this application embodiment can be applied not only to some battery devices with a long plateau region and rapid voltage change at the plateau region, such as battery devices without a negative electrode, but also to other battery devices, such as battery devices without a plateau region, or battery devices with a short plateau region and relatively slow voltage change at the plateau region, or battery devices with a short plateau region and rapid voltage change at the plateau region.

[0165] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0166] The control method of the battery device according to the embodiments of this application has been described in detail above. The following will be combined with... Figure 8 and Figure 9The battery management system of the embodiments of this application is described in detail. The technical features described in the method embodiments are applicable to the following embodiments of the battery management system.

[0167] Figure 8 This is a schematic block diagram of the battery management system provided in an embodiment of this application. Figure 8 The battery management system 4000 includes some or all of the following components.

[0168] The battery management system 4000 includes an acquisition unit 4010 and a control unit 4020.

[0169] Acquisition unit 4010 is used to acquire a first parameter of the battery device, the first parameter including continuous current and / or power, and the required rate of decrease of allowable current and / or power; and to acquire a second parameter of the battery device, the second parameter including dischargeable excess capacity, which includes an additional dischargeable amount of the battery device beyond the continuous current and / or power; control unit 4020 is used to control the adjustment of the allowable current and / or power of the battery device discharge according to the first parameter and the second parameter.

[0170] In some embodiments, the acquisition unit 4010 is specifically used to acquire a second parameter of the battery device discharge, wherein the dischargeable excess capacity includes the dischargeable excess capacity.

[0171] In some embodiments, the first parameter further includes peak current and / or power.

[0172] In some embodiments, the control unit 4020 is specifically configured to determine a target current and / or power of the battery device based on the discharge excess capacity, continuous current and / or power, and required rate of decrease; and to control the adjustment of the allowable current and / or power of the battery device discharge based on the smaller of the target current and / or power and the peak current and / or power.

[0173] In some embodiments, the control unit 4020 is specifically configured to determine the target current and / or power according to the following formula: ,in, For target current and / or power, To achieve the required descent rate, To allow for the discharge of excess power, For continuous current and / or power.

[0174] In some embodiments, the acquisition unit 4010 is further configured to acquire a third parameter of the battery device, the third parameter including actual current and / or power, time corresponding to actual current and / or power, and peak time corresponding to peak current and / or power, wherein actual current and / or power is the current and / or power of the battery device discharging under continuous current and / or power and peak current and / or power that is greater than continuous current and / or power; the control unit 4020 is further configured to determine the excess discharge capacity based on peak current and / or power, continuous current and / or power, and the third parameter.

[0175] In some embodiments, the control unit 4020 is specifically configured to: determine the total excess charge discharged by the battery device under peak current and / or power and continuous current and / or power based on peak current and / or power, continuous current and / or power, and peak time; determine the excess charge already discharged by the battery device based on actual current and / or power, the time corresponding to actual current and / or power, and continuous current and / or power; and determine the excess charge that can be discharged based on the total excess charge and the excess charge already discharged.

[0176] In some embodiments, the control unit 4020 is specifically configured to determine the total excess discharge capacity according to the following formula: ,in, To discharge excess power, For peak current and / or power, For continuous current and / or power, This is the peak time.

[0177] In some embodiments, the control unit 4020 is specifically configured to determine the excess discharge capacity according to the following formula: ,in, Excess power has been discharged. For actual current and / or power, For continuous current and / or power, The time corresponding to the actual current and / or power.

[0178] In some embodiments, the battery device includes a negative electrode-free battery device.

[0179] It should be understood that the above and other operations and / or functions of the various modules in the battery management system 4000 are for the purpose of achieving Figures 2 to 7 For the sake of brevity, the corresponding processes in each method will not be elaborated here.

[0180] Figure 9 A schematic block diagram of a battery management system 4000 according to an embodiment of this application is shown. Figure 9As shown, the battery management system 4000 includes a processor 5010 and a memory 5020, wherein the memory 5020 is used to store instructions, and the processor 5010 is used to read instructions and execute the methods of the various embodiments of the present application based on the instructions.

[0181] The memory 5020 can be a separate device independent of the processor 5010, or it can be integrated into the processor 5010.

[0182] Optionally, such as Figure 9 As shown, the battery management system 4000 may also include a transceiver 5030, and the processor 5010 can control the transceiver 5030 to communicate with other devices. Specifically, it can send information or data to other devices, or receive information or data sent by other devices.

[0183] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0184] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0185] This application also provides a battery system, which includes a battery device and a battery management system provided in this application.

[0186] For details on the battery management system, please refer to the above text. Figure 8 and Figure 9 For the sake of brevity, the relevant descriptions in the original document will not be repeated here.

[0187] This application also provides an electrical device, which includes a load and a battery system. The battery system is connected to the load and is used to supply power to the load.

[0188] As an example, the battery system is used to provide direct current (DC) to a load, where the DC voltage is greater than a voltage threshold. In other words, the load is a high-voltage load, and the battery system can supply high-voltage power to the load.

[0189] As an example, electrical equipment may also include other loads such as low-voltage loads.

[0190] This application embodiment also provides an electrical device, which includes a first load, a second load, and a battery system. The battery system is connected to the first load to provide a first direct current to the first load, and the battery system is connected to the second load to provide a second direct current to the second load. The voltage of the first direct current is greater than the voltage of the second direct current.

[0191] In other words, the first load is a high-voltage load, and the second load is a low-voltage load. The battery system provides high-voltage power to the first load and low-voltage power to the second load.

[0192] This application also provides a computer-readable storage medium for storing computer programs.

[0193] When the computer program is run on a computer, it causes the computer to perform the various methods of the embodiments of this application.

[0194] This application also provides a computer program product, including computer program instructions.

[0195] When the computer program instructions are run on a computer, the computer causes the computer to perform the various methods of the embodiments of this application.

[0196] This application also provides a computer program.

[0197] When the computer program is run on a computer, it causes the computer to perform the various methods of the embodiments of this application.

[0198] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0199] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0200] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection involved in the embodiments of this application may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0201] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0202] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0203] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0204] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 control method of a battery device, characterized by, The control method includes: Obtain first parameters of the battery device, the first parameters including continuous current and / or power, and the required rate of decrease of allowable current and / or power; Obtain a second parameter of the battery device, the second parameter including the dischargeable excess capacity, the dischargeable excess capacity including the additional dischargeable amount of the battery device beyond the base capacity corresponding to the continuous current and / or power; Based on the first parameter and the second parameter, the allowable current and / or power of the battery device discharge is adjusted, wherein the allowable current and / or power is less than or equal to the peak current and / or power of the battery device, and the allowable current and / or power is positively correlated with the allowable excess discharge capacity.

2. The control method according to claim 1, characterized by, The first parameter also includes the peak current and / or power.

3. The control method according to claim 2, characterized by, The adjustment of the allowable current and / or power for discharging the battery device based on the first parameter and the second parameter includes: The target current and / or power of the battery device are determined based on the available excess capacity, the continuous current and / or power, and the required rate of decrease. The allowable current and / or power of the battery device discharge is adjusted based on the smaller of the target current and / or power and the peak current and / or power.

4. The control method according to claim 3, characterized by, Determining the target current and / or power of the battery device based on the dispensable excess capacity, the continuous current and / or power, and the required rate of decline includes: ， wherein, is the target current and / or power, is the required ramp-down rate, is the excess power that can be shed, is the sustained current and / or power.

5. The control method according to claim 2, characterized in that, Before obtaining the second parameter of the battery device, the control method further includes: Obtain a third parameter of the battery device, the third parameter including actual current and / or power, time corresponding to the actual current and / or power, and peak time corresponding to the peak current and / or power, wherein the actual current and / or power is the current and / or power at which the battery device discharges under the continuous current and / or power and the peak current and / or power and is greater than the continuous current and / or power; The excess discharge capacity is determined based on the peak current and / or power, the continuous current and / or power, and the third parameter.

6. The control method according to claim 5, characterized in that, The step of determining the dischargeable excess capacity based on the peak current and / or power, the continuous current and / or power, and the third parameter includes: The total excess discharge capacity of the battery device under the peak current and / or power, and the continuous current and / or power, is determined based on the peak current and / or power, the continuous current and / or power, and the peak time. The excess charge discharged by the battery device is determined based on the actual current and / or power, the time corresponding to the actual current and / or power, and the continuous current and / or power. The available excess capacity is determined based on the total excess capacity and the already released excess capacity.

7. The control method according to claim 6, characterized in that, The step of determining the total excess discharge capacity of the battery device under the peak current and / or power, and the continuous current and / or power, and the peak time based on the peak current and / or power, and the continuous current and / or power, includes: ， in, The total excess discharge capacity is mentioned above. For the peak current and / or power, For the continuous current and / or power, The peak time is denoted as .

8. The control method according to claim 6, characterized in that, Determining the excess charge discharged by the battery device based on the actual current and / or power, the time corresponding to the actual current and / or power, and the continuous current and / or power, includes: , in, The excess power has been discharged. For the actual current and / or power, For the continuous current and / or power, The time corresponding to the actual current and / or power.

9. The control method according to any one of claims 1 to 8, characterized in that, The battery device includes a negative electrode-free battery device.

10. A battery management system, characterized in that, The battery management system includes: Acquisition unit, configured to acquire first parameters of the battery device, the first parameters including continuous current and / or power, and the required rate of decrease of allowable current and / or power; and Obtain a second parameter of the battery device, the second parameter including the dischargeable excess capacity, the dischargeable excess capacity including the additional dischargeable amount of the battery device beyond the base capacity corresponding to the continuous current and / or power; The control unit is configured to adjust the allowable current and / or power of the battery device discharge according to the first parameter and the second parameter, wherein the allowable current and / or power is less than or equal to the peak current and / or power of the battery device, and the allowable current and / or power is positively correlated with the allowable excess discharge capacity.

11. A battery management system, characterized in that, The battery management system includes a memory and a processor. The memory is used to store instructions, and the processor is used to read the instructions and execute the control method as described in any one of claims 1 to 9 according to the instructions.

12. A battery system, characterized in that, The battery system includes a battery device and a battery management system as described in claim 10 or 11.

13. An electrical appliance, characterized in that, The electrical equipment includes: load; And the battery system as claimed in claim 12, wherein the battery system is connected to the load for supplying power to the load.

14. An electrical appliance, characterized in that, The electrical equipment includes: First load; Second load; And the battery system as claimed in claim 12, wherein the battery system is connected to the first load for providing a first direct current to the first load, and the battery system is connected to the second load for providing a second direct current to the second load, wherein the voltage of the first direct current is greater than the voltage of the second direct current.

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