Battery system energy management method, battery system, battery management system and electric device

Abstract

The embodiment of the present application provides a battery system energy management method, a battery system, a battery management system and a power utilization device, which are suitable for a battery system comprising a first battery pack and a second battery pack, a bidirectional power module is connected between the first battery pack and the second battery pack, and energy output can be independently performed on the first battery pack and the second battery pack. The method comprises the following steps: determining a first charging time of charging the first battery pack from a first SOC to a first target SOC and a second charging time of charging the second battery pack from a second SOC to a second target SOC; and controlling the battery pack with a short charging time to transfer energy to the battery pack with a long charging time according to the first charging time and the second charging time. The battery system energy management method, the battery system, the battery management system and the power utilization device provided by the embodiment of the present application can reduce the charging time of the battery system.

Description

Technical Field

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

[0002] In the field of new energy, battery systems are the primary power source for electrical equipment such as electric vehicles, ships, and spacecraft, and their importance is self-evident. Therefore, battery technology is a crucial factor in the development of electrical equipment.

[0003] During the battery system charging process, reducing the charging time and increasing the charging rate can reduce the user's charging wait time and improve the user experience. Summary of the Invention

[0004] This application provides a battery system energy management method, a battery system, a battery management system, and an electrical device, which can reduce the charging time required for the battery system and improve the charging rate of the battery system.

[0005] In a first aspect, a battery system energy management method is provided. This method is applicable to a battery system including a first battery pack and a second battery pack, wherein a bidirectional power module is connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently. The method includes: determining a first charging time and a second charging time, wherein the first charging time is the time for the first battery pack to charge from a first state of charge (SOC) to a first target state of charge (SOC), and the second charging time is the time for the second battery pack to charge from a second SOC to a second target SOC; and before the first battery pack and the second battery pack are fully charged, controlling the battery pack with the shorter charging time to transfer energy to the battery pack with the longer charging time, based on the first charging time and the second charging time.

[0006] In this embodiment, before the first and second battery packs are fully charged, energy can be transferred from the battery pack with the shorter charging time to the battery pack with the longer charging time, based on the first charging time of the first battery pack and the second charging time of the second battery pack. This reduces the difference in charging time between the first and second battery packs, thereby reducing the time required for the battery system to charge, increasing the charging rate of the battery system, and consequently reducing the user's charging waiting time and improving the user experience.

[0007] In one possible implementation, based on a first charging time and a second charging time, controlling the battery pack with the shorter charging time in the first battery pack and the second battery pack to transfer energy to the battery pack with the longer charging time includes: when the difference between the first charging time and the second charging time is greater than or equal to a first preset value, controlling the battery pack with the shorter charging time in the first battery pack and the second battery pack to transfer energy to the battery pack with the longer charging time.

[0008] In this embodiment, when the difference between the charging time of the first battery pack and the charging time of the second battery pack is greater than or equal to a first preset value, the battery pack with the shorter charging time in the first battery pack and the battery pack with the longer charging time can be controlled to transfer energy to the battery pack with the longer charging time. This can reduce the time difference between the first battery pack being charged to the first target SOC and the second battery pack being charged to the second target SOC, thereby reducing the charging time of the battery system and improving the charging rate of the battery system.

[0009] In one possible implementation, based on a first charging time and a second charging time, controlling the battery pack with the shorter charging time to transfer energy to the battery pack with the longer charging time in the first battery pack and the second battery pack includes: controlling the first battery pack to transfer energy to the second battery pack when the first charging time is less than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to a first preset value; or, controlling the second battery pack to transfer energy to the first battery pack when the first charging time is greater than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to the first preset value.

[0010] In this embodiment, energy transfer can be controlled from the first battery pack to the second battery pack when the charging time of the first battery pack is shorter than that of the second battery pack, and the difference between their charging times is significant; conversely, energy transfer can be controlled from the second battery pack to the first battery pack when the charging time of the first battery pack is longer than that of the second battery pack, and the difference between their charging times is significant. This allows energy to be transferred from the battery pack with the shorter charging time to the battery pack with the longer charging time, reducing the time difference between the first battery pack reaching the first target SOC and the second battery pack reaching the second target SOC, thereby reducing the overall charging time of the battery system and increasing its charging rate.

[0011] In one possible implementation, before determining the first charging time and the second charging time, the method further includes: obtaining a first parameter and a second parameter, the first parameter including a first SOC and a first target SOC, and the second parameter including a second SOC and a second target SOC; determining the first charging time and the second charging time includes: determining the first charging time based on the first parameter; and determining the second charging time based on the second parameter.

[0012] In the embodiments of this application, the first charging time of the first battery pack can be accurately estimated based on the first SOC and the first target SOC; and the second charging time of the second battery pack can be accurately estimated based on the second SOC and the second target SOC, thereby reasonably controlling the energy transfer between the first battery pack and the second battery pack based on the first charging time and the second charging time.

[0013] In one possible implementation, the first parameter further includes a first temperature of the first battery pack and / or a discharge parameter of the charging device, and the second parameter further includes a second temperature of the second battery pack and / or a discharge parameter of the charging device, wherein the first temperature is the temperature at which the first battery pack will start charging in the future or the temperature at which it is currently charging, and the second temperature is the temperature at which the second battery pack will start charging in the future or the temperature at which it is currently charging.

[0014] In this embodiment, the first charging time of the first battery pack can be determined based on the first SOC, the first target SOC, the first temperature of the first battery pack, and / or the discharge parameters of the charging device; and the second charging time of the second battery pack can be determined based on the second SOC, the second target SOC, the second temperature of the second battery pack, and / or the discharge parameters of the charging device. Thus, in addition to considering the current SOC and target SOC of each battery, the temperature of each battery pack and / or the discharge parameters of the corresponding charging device are also considered, thereby enabling accurate determination of the first and second charging times.

[0015] In one possible implementation, the method further includes: during the energy transfer process from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first battery pack and the second battery pack, determining a third charging time and a fourth charging time, wherein the third charging time is the time for the first battery pack to charge from a third SOC to a first target SOC, and the fourth charging time is the time for the second battery pack to charge from a fourth SOC to a second target SOC; and if the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, controlling the battery pack with the shorter charging time in the first battery pack and the second battery pack to stop transferring energy to the battery pack with the longer charging time, wherein the second preset value is less than or equal to the first preset value.

[0016] In this embodiment, during the energy transfer process from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first and second battery packs, when the difference between the charging times of the first and second battery packs decreases to less than or equal to a second preset value, the battery pack with the shorter charging time can be controlled to stop transferring energy to the battery pack with the longer charging time. In this way, the difference in charging time between the first and second battery packs can be controlled within a preset range, preventing continuous energy transfer between the two battery packs and reducing the possibility of increased battery system charging time due to excessive energy transfer.

[0017] In one possible implementation, when the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, controlling the battery pack with the shorter charging time in the first battery pack and the second battery pack to stop transferring energy to the battery pack with the longer charging time includes: controlling the first battery pack to stop transferring energy to the second battery pack when the third charging time is less than or equal to the fourth charging time and the difference between the third charging time and the fourth charging time is less than or equal to the second preset value; or, controlling the second battery pack to stop transferring energy to the first battery pack when the third charging time is greater than or equal to the fourth charging time and the difference between the third charging time and the fourth charging time is less than or equal to the second preset value.

[0018] In this embodiment, during the energy transfer process from the first battery pack to the second battery pack, when the charging time of the first battery pack is less than the charging time of the second battery pack, and the difference between them decreases to less than or equal to a second preset value, the first battery pack can be controlled to stop transferring energy to the second battery pack. Alternatively, during the energy transfer process from the second battery pack to the first battery pack, when the charging time of the first battery pack is greater than the charging time of the second battery pack, and the difference between them decreases to less than or equal to the second preset value, the second battery pack can be controlled to stop transferring energy to the first battery pack. In this way, the difference in charging time between the first and second battery packs can be controlled within a preset range, preventing continuous energy transfer between them. This reduces the increase in battery system charging time caused by excessive energy transfer between the first and second battery packs, and significantly reduces the energy transfer time between them, thus improving the performance of both battery packs.

[0019] In one possible implementation, before determining the third charging time and the fourth charging time, the method further includes: obtaining a third parameter and a fourth parameter, wherein the third parameter includes a third SOC and a first target SOC, and the fourth parameter includes a fourth SOC and a second target SOC; determining the third charging time and the fourth charging time includes: determining the third charging time based on the third parameter; and determining the fourth charging time based on the fourth parameter.

[0020] In the embodiments of this application, during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first battery pack and the second battery pack, the third charging time of the first battery pack can be accurately estimated based on the third SOC and the first target SOC; and the fourth charging time of the second battery pack can be accurately estimated based on the fourth SOC and the second target SOC, thereby reasonably controlling the cessation of energy transfer between the first battery pack and the second battery pack based on the third charging time and the fourth charging time.

[0021] In one possible implementation, the third parameter further includes the third temperature of the first battery pack and / or the discharge parameters of the charging device, and the fourth parameter further includes the fourth temperature of the second battery pack and / or the discharge parameters of the charging device, wherein the third temperature is the temperature at which the first battery pack will start charging in the future or the temperature at which it is currently charging, and the fourth temperature is the temperature at which the second battery pack will start charging in the future or the temperature at which it is currently charging.

[0022] In this embodiment, the third charging time of the first battery pack can be determined based on the third SOC, the first target SOC, the third temperature of the first battery pack, and / or the discharge parameters of the charging device; and the fourth charging time of the second battery pack can be determined based on the fourth SOC, the second target SOC, the fourth temperature of the second battery pack, and / or the discharge parameters of the charging device. Thus, in addition to considering the current SOC and target SOC of each battery pack, the temperature of each battery pack and / or the discharge parameters of the corresponding charging device are also considered, thereby enabling accurate determination of the third and fourth charging times.

[0023] Secondly, a battery system is provided, comprising a first battery pack and a second battery pack, wherein a bidirectional power module is connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently. The battery system includes: a determining unit, configured to determine a first charging time and a second charging time, wherein the first charging time is the time for the first battery pack to charge from a first SOC to a first target SOC, and the second charging time is the time for the second battery pack to charge from a second SOC to a second target SOC; and a control unit, configured to, before the charging of the first battery pack and the second battery pack is completed, control the battery pack with the shorter charging time to transfer energy to the battery pack with the longer charging time, based on the first charging time and the second charging time.

[0024] In one possible implementation, the control unit is specifically configured to control the battery pack with the shorter charging time in the first battery pack and the second battery pack to transfer energy to the battery pack with the longer charging time when the difference between the first charging time and the second charging time is greater than or equal to a first preset value.

[0025] In one possible implementation, the control unit is specifically configured to control the first battery pack to transfer energy to the second battery pack when the first charging time is less than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to a first preset value; or, when the first charging time is greater than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to the first preset value, control the second battery pack to transfer energy to the first battery pack.

[0026] In one possible implementation, the battery system further includes: an acquisition unit for acquiring a first parameter and a second parameter, the first parameter including a first SOC and a first target SOC, and the second parameter including a second SOC and a second target SOC; and a determination unit specifically configured to determine a first charging time based on the first parameter and a second charging time based on the second parameter.

[0027] In one possible implementation, the first parameter further includes a first temperature of the first battery pack and / or a discharge parameter of the charging device, and the second parameter further includes a second temperature of the second battery pack and / or a discharge parameter of the charging device, wherein the first temperature is the temperature at which the first battery pack will start charging in the future or the temperature at which it is currently charging, and the second temperature is the temperature at which the second battery pack will start charging in the future or the temperature at which it is currently charging.

[0028] In one possible implementation, the determining unit is further configured to determine a third charging time and a fourth charging time during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first battery pack and the second battery pack, wherein the third charging time is the time for the first battery pack to charge from a third SOC to a first target SOC, and the fourth charging time is the time for the second battery pack to charge from a fourth SOC to a second target SOC; the control unit is further configured to control the battery pack with a shorter charging time in the first battery pack and the second battery pack to stop transferring energy to the battery pack with a longer charging time when the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, wherein the second preset value is less than or equal to the first preset value.

[0029] In one possible implementation, the control unit is specifically configured to control the first battery pack to stop transferring energy to the second battery pack when the third charging time is less than or equal to the fourth charging time and the difference between the third charging time and the fourth charging time is less than or equal to a second preset value; or, when the third charging time is greater than or equal to the fourth charging time and the difference between the third charging time and the fourth charging time is less than or equal to the second preset value, control the second battery pack to stop transferring energy to the first battery pack.

[0030] In one possible implementation, the battery system further includes: an acquisition unit for acquiring a third parameter and a fourth parameter, the third parameter including a third SOC and a first target SOC, and the fourth parameter including a fourth SOC and a second target SOC; and a determination unit specifically for determining a third charging time based on the third parameter and a fourth charging time based on the fourth parameter.

[0031] In one possible implementation, the third parameter further includes the third temperature of the first battery pack and / or the discharge parameters of the charging device, and the fourth parameter further includes the fourth temperature of the second battery pack and / or the discharge parameters of the charging device, wherein the third temperature is the temperature at which the first battery pack will start charging in the future or the temperature at which it is currently charging, and the fourth temperature is the temperature at which the second battery pack will start charging in the future or the temperature at which it is currently charging.

[0032] In one possible implementation, both the first battery pack and the second battery pack are energy-type batteries, or both the first battery pack and the second battery pack are power-type batteries.

[0033] In this embodiment of the application, both the first battery pack and the second battery pack are configured as energy-type batteries or power-type batteries, which can simplify the design of the battery system.

[0034] In one possible implementation, the first battery pack is an energy-type battery and the second battery pack is a power-type battery; or, the first battery pack is a power-type battery and the second battery pack is an energy-type battery.

[0035] In this embodiment of the application, the first battery pack and the second battery pack are configured as different types of batteries, which enables the battery system to meet different usage scenarios.

[0036] Thirdly, a battery management system is provided, the battery management system including a memory and a processor, the memory for storing instructions, and the processor for reading instructions and executing methods as described in the first aspect and any possible implementation thereof.

[0037] Fourthly, an electrical device is provided, the electrical device including a load; and a battery system according to any possible implementation of the second aspect above, the battery system being connected to the load for supplying power to the load.

[0038] Fifthly, an electrical device is provided, comprising a first load; a second load; and a battery system as described in any possible implementation of the second aspect above, the battery system being connected to the first load for providing a first direct current to the first load, and / or 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.

[0039] In a sixth aspect, a chip is provided, comprising: a processor for calling and running a computer program from memory, such that a device on which the chip is mounted performs the methods as described in the first aspect and any possible implementation thereof.

[0040] In a seventh aspect, a computer program is provided that, when executed by a computer, causes the computer to implement the methods described in the first aspect and any possible implementation thereof.

[0041] Eighthly, a computer-readable storage medium is provided for storing a computer program that, when executed by a computer, causes the computer to implement the methods described in the first aspect and any possible implementation thereof.

[0042] Ninth aspect, a computer program product is provided, including computer program instructions that, when executed by a computer, cause the computer to implement the methods of the first aspect and any possible implementation thereof. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of a battery system provided in an embodiment of this application.

[0044] Figure 2This is a flowchart illustrating the battery system energy management method provided in an embodiment of this application.

[0045] Figure 3 This is another schematic flowchart of the battery system energy management method provided in the embodiments of this application.

[0046] Figure 4 This is another schematic flowchart of the battery system energy management method provided in the embodiments of this application.

[0047] Figure 5 This is a schematic diagram illustrating the process of determining the first charging time and the second charging time, provided for an embodiment of this application.

[0048] Figure 6 This is another schematic flowchart of the battery system energy management method provided in the embodiments of this application.

[0049] Figure 7 This is another schematic flowchart of the battery system energy management method provided in the embodiments of this application.

[0050] Figure 8 This is a schematic diagram illustrating the process of determining the third charging time and the fourth charging time, provided for an embodiment of this application.

[0051] Figure 9 This is a schematic block diagram of a battery system provided in an embodiment of this application.

[0052] Figure 10 This is a schematic block diagram of a battery management system provided in an embodiment of this application.

[0053] Figure 11 This is a schematic block diagram of an electrical device according to an embodiment of this application.

[0054] Figure 12 Another schematic block diagram of the electrical equipment provided in the embodiments of this application. Detailed Implementation

[0055] 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.

[0056] 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.

[0057] The term "and / or" simply describes 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In the field of new energy, battery systems are of paramount importance as the main power source for electrical devices such as electric vehicles, ships, or spacecraft. To further improve the performance and safety of battery systems, multiple independently operating energy zones can be set up. For example, two independent energy zones can be set up, thereby enabling multiple redundancy designs and energy management, such as flexible high-voltage power supply, flexible low-voltage power supply, thermal management redundancy, and thermal runaway isolation.

[0062] Setting up independent energy zones ensures stable power output, reduces the likelihood of equipment being affected by power failure, and allows another zone to maintain power supply even in the event of a single zone failure, ensuring continued normal operation of the equipment. Furthermore, independent energy zones allow for more flexible battery system design, catering to diverse usage scenarios. For example, independent energy zones can be paired with battery cells exhibiting different temperature performance characteristics and each zone can have its own independent temperature control. This allows the battery system to adapt to both extremely cold and high-temperature environments, enabling it to perform at its best under a wider range of conditions.

[0063] In a multi-energy-zone (multi-battery-pack) battery system, the charging time required for multiple battery packs varies significantly due to differences in their charging capabilities and initial charging parameters (such as initial state of charge). This causes the overall charging time of the battery system to be consistent with that of the slower-charging battery packs, greatly increasing the total charging time required for the battery system.

[0064] Based on the above problems, this application provides a battery system energy management method, a battery system, a battery management system, and an electrical device. The method is applicable to a battery system including a first battery pack and a second battery pack, wherein a bidirectional power module is connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently. The method includes: determining a first charging time and a second charging time, wherein the first charging time is the time for the first battery pack to charge from a first SOC to a first target SOC, and the second charging time is the time for the second battery pack to charge from a second SOC to a second target SOC; before the first battery pack and the second battery pack are fully charged, controlling the battery pack with the shorter charging time to transfer energy to the battery pack with the longer charging time, based on the first charging time and the second charging time.

[0065] This application provides a battery system energy management method, a battery system management system, and an electrical device, which can reduce the charging time of the battery system and improve the charging rate of the battery system.

[0066] It should be understood that the electrical equipment mentioned in the embodiments of this application can refer to vehicles, such as electric vehicles, electric cars, etc. The electrical equipment mentioned in the embodiments of this application can also be other battery-powered devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. 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 battery-powered devices.

[0067] The following combination Figure 1 The battery system described above, which has multiple independent energy zones, will be further illustrated with an example.

[0068] like Figure 1 As shown, a battery system may include multiple independent energy zones, each equipped with a battery pack. For example, a battery system may include two independent energy zones, such as energy zone A and energy zone B, with a first battery pack and a second battery pack respectively in each zone.

[0069] Energy zones are the parts of a battery system that can operate and be controlled independently. For example, each energy zone can be charged and discharged separately. Specifically, energy zones can be divided according to the battery settings in the battery system.

[0070] As an example, each energy zone's battery pack can individually power the load of the electrical equipment.

[0071] For example, the first and second battery packs can supply power to the load of the electrical equipment independently.

[0072] The first and second battery packs can simultaneously supply power to the load of the electrical equipment. Alternatively, one of the first and second battery packs can be used first to supply power to the load of the electrical equipment, and if the first battery pack is depleted or fails, the other battery pack can be switched to supply power to the load of the electrical equipment.

[0073] As another example, one of the first battery pack and the second battery pack can be used to supply power to the load of an electrical device. In this case, the other of the first battery pack and the second battery pack can be used to transfer energy to that first battery pack in order to supply power to it.

[0074] As an example, the first and second battery packs can be charged via a charging device.

[0075] As an example, a charging device may include a charging station and / or a charging gun.

[0076] As an example, the first and second battery packs can be charged separately or as a whole.

[0077] For example, the charging device can charge the first battery pack and the second battery pack as a whole, such as when the first battery pack and the second battery pack are connected in parallel or in series, and then charged by the charging device.

[0078] For example, the charging device can charge the first battery pack and the second battery pack separately. The charging device may include a first charging device and a second charging device, with the first charging device charging the first battery pack and the second charging device charging the second battery pack. The first and second charging devices can also be designed as an integrated unit or as independent units.

[0079] As an example, energy can be transferred between the first battery pack and the second battery pack.

[0080] For example, the first and second battery packs can be connected via a bidirectional power module. A bidirectional power module is a device or circuit that enables bidirectional energy transfer, such as a direct current / direct current (DC / DC) converter circuit, a flyback transformer, etc.

[0081] As an example, a battery system may also include a battery management system.

[0082] For example, a battery system may include a battery management system that can control the charging and discharging of a first battery pack and a second battery pack, as well as the energy transfer between the first battery pack and the second battery pack.

[0083] For example, the battery system may include two battery management systems, one for controlling the charging and discharging of a first battery pack and the other for controlling the second battery pack. The two battery management systems can communicate with each other, and one of them can control the energy transfer between the first and second battery packs.

[0084] Specifically, the first battery pack and the second battery pack can be battery packs, battery modules, or battery collections formed by electrical connections of individual battery cells.

[0085] Optionally, when the battery system includes one or more battery packs, energy zones can be divided within each battery pack. The first battery group and the second battery group can be located in different energy zones within each battery pack, and partition beams can be provided between the energy zones to isolate them. Alternatively, when the battery system includes multiple battery packs, each battery pack can be considered as an energy zone, and multiple energy zones can be formed among the multiple battery packs.

[0086] In the embodiments of this application, the first battery pack and the second battery pack may be of the same type or different types. For example, the first battery pack may be a power battery and the second battery pack may be an energy battery; or the first battery pack may be an energy battery and the second battery pack may be a power battery; or both the first battery pack and the second battery pack may be power batteries or energy batteries.

[0087] It should be understood that Figure 1 The components shown are just examples. In actual applications, the components may have different names, or they may be added or deleted as needed.

[0088] The following combination Figures 2 to 8 The energy management method for battery systems provided in the embodiments of this application will be described by way of example.

[0089] Figure 2 This is a flowchart illustrating the battery system energy management method provided in an embodiment of this application. Figure 2 The method shown can be applied to battery systems including a first battery pack and a second battery pack, such as... Figure 1 The battery system shown has a bidirectional power module connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently.

[0090] 210, determine the first charging time and the second charging time.

[0091] The first charging time is the time it takes for the first battery pack to charge from the first SOC to the first target SOC, and the second charging time is the time it takes for the second battery pack to charge from the second SOC to the second target SOC.

[0092] As an example, the time it takes for the first battery pack to be charged from its current first SOC to a first target SOC by the charging device can be determined, and the second charging time is the time it takes for the second battery pack to be charged from its current second SOC to a second target SOC by the charging device.

[0093] As an example, a charging device may include a charging station and / or a charging gun.

[0094] As an example, the charging device can charge the first battery pack and the second battery pack as a whole, for example, after the first battery pack and the second battery pack are connected in parallel or in series, the charging device can charge them.

[0095] As an example, the charging device may include a first charging device and a second charging device, wherein the first charging device charges a first battery pack and the second charging device charges a second battery pack. The first and second charging devices may be integrated or designed independently.

[0096] As an example, the first and second battery packs can be charged essentially simultaneously.

[0097] The first target SOC refers to the SOC required to charge the first battery pack. The second target SOC refers to the SOC required to charge the second battery pack.

[0098] As an example, the first target SOC and the second target SOC can be determined based on the performance of the first battery pack and the second battery pack, as well as the user's usage requirements.

[0099] For example, the first target SOC can be the upper limit of the allowed SOC of the first battery pack. Alternatively, the first target SOC can also be less than the upper limit of the allowed SOC of the first battery pack.

[0100] For example, the second target SOC can be the upper limit of the SOC allowed by the second battery pack. Alternatively, the second target SOC can also be less than the upper limit of the SOC allowed by the second battery pack.

[0101] As an example, the first SOC can be the overall SOC of the first battery pack, and the second SOC can be the overall SOC of the second battery pack.

[0102] Alternatively, the first SOC can be the minimum SOC and / or minimum voltage of a single cell in the first battery pack, and the second SOC can be the minimum SOC and / or minimum voltage of a single cell in the second battery pack.

[0103] 220. Before the first battery pack and the second battery pack are fully charged, based on the first charging time and the second charging time, control the battery pack with the shorter charging time to transfer energy to the battery pack with the longer charging time.

[0104] As an example, in this embodiment, before the first battery pack and the second battery pack are fully charged, it may include: before the first battery pack and the second battery pack are charged, and / or during the charging process of the first battery pack and the second battery pack.

[0105] Before the first and second battery packs are charged, it can refer to a situation where the charging device is already connected to the battery system (the first and second battery packs) but the charging device is not charging the battery system; or it can refer to a situation where the charging device is about to connect to the battery system and start charging (at this time, the battery system will not supply power to the device).

[0106] For example, the battery system in an electrical device such as an electric vehicle is connected to a charging device, but the charging device has not yet started charging the battery system. In this case, the battery management system can detect the connection after the battery system is connected to the charging device.

[0107] For example, when electrical equipment such as an electric vehicle is in a garage, the battery management system can detect that the charging device is about to charge the electric vehicle. This can be achieved in several ways: by using historical charging data of the battery system; or by having the user send a charging request directly or indirectly to the battery management system, which will then be aware that the battery is about to be charged.

[0108] "About to charge" can refer to a period of time before charging begins, such as five minutes, ten minutes, half an hour, or longer. The specific time before charging can be determined based on factors such as the energy transfer capability between the first and second battery packs and the user's usage habits of the first and second battery packs.

[0109] Energy transfer from the battery pack with shorter charging time to the battery pack with longer charging time in the first and second battery packs can be either from the first battery pack to the second battery pack, or from the second battery pack to the first battery pack.

[0110] As an example, if the first charging time is less than the second charging time, control the first battery pack to transfer energy to the second battery pack; or, if the first charging time is greater than the second charging time, control the second battery pack to transfer energy to the first battery pack.

[0111] In this embodiment, before the first and second battery packs are fully charged, energy can be transferred from the battery pack with the shorter charging time to the battery pack with the longer charging time, based on the first charging time of the first battery pack and the second charging time of the second battery pack. This reduces the difference in charging time between the first and second battery packs, thereby reducing the charging time required for the battery system and increasing the charging rate of the battery system. Consequently, it can reduce the user's charging waiting time and improve the user experience.

[0112] Figure 3 This is a flowchart illustrating the battery system energy management method provided in an embodiment of this application. Figure 3 The method shown can be applied to battery systems including a first battery pack and a second battery pack, such as... Figure 1 The battery system shown has a bidirectional power module connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently.

[0113] 310, determine the first charging time and the second charging time.

[0114] The first charging time is the time it takes for the first battery pack to charge from the first SOC to the first target SOC, and the second charging time is the time it takes for the second battery pack to charge from the second SOC to the second target SOC.

[0115] The content of step 310 can be found in the relevant description of step 210, and will not be repeated here.

[0116] 320, when the difference between the first charging time and the second charging time is greater than or equal to a first preset value, control the battery pack with the shorter charging time in the first battery pack and the second battery pack to transfer energy to the battery pack with the longer charging time.

[0117] It should be understood that, in the embodiments of this application, the difference between the first charging time and the second charging time is a positive number.

[0118] As an example, the difference between the first charging time and the second charging time can be the absolute value of the difference between the first charging time and the second charging time; or it can be the absolute value of the ratio of the difference between the first charging time and the second charging time to the first charging time (or the second charging time).

[0119] For example, when the difference between the first charging time and the second charging time is the absolute value of the difference between the first charging time and the second charging time, the first preset value can be set to 10 minutes, 20 minutes, half an hour or longer.

[0120] For example, when the difference between the first charging time and the second charging time is the absolute value of the ratio of the difference between the first charging time and the second charging time to the first charging time (or the second charging time), the first preset value can be set to 10%, 15%, or 20%, etc.

[0121] In this embodiment, if the difference between the first charging time and the second charging time is greater than or equal to a first preset value, it indicates that the difference between the charging time of the first battery pack and the charging time of the second battery pack is relatively large, and the charging time of the battery system is consistent with that of the battery pack with the longer charging time. In this case, energy transfer can be controlled from the battery pack with the shorter charging time to the battery pack with the longer charging time, thereby reducing the time difference between the first battery pack reaching the first target SOC and the second battery pack reaching the second target SOC, thus reducing the charging time of the battery system and improving charging efficiency.

[0122] Figure 4 This is a flowchart illustrating the battery system energy management method provided in an embodiment of this application. Figure 4 The method shown can be applied to battery systems including a first battery pack and a second battery pack, such as... Figure 1The battery system shown has a bidirectional power module connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently.

[0123] 410, determine the first charging time and the second charging time.

[0124] The first charging time is the time it takes for the first battery pack to charge from the first SOC to the first target SOC, and the second charging time is the time it takes for the second battery pack to charge from the second SOC to the second target SOC.

[0125] The content of step 410 can be found in the relevant description of step 210, and will not be repeated here.

[0126] 420a, when the first charging time is less than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to a first preset value, controls the first battery pack to transfer energy to the second battery pack.

[0127] It should be understood that, in the embodiments of this application, the difference between the first charging time and the second charging time is a positive number.

[0128] As an example, the difference between the first charging time and the second charging time can be the absolute value of the difference between the first charging time and the second charging time; or it can be the absolute value of the ratio of the difference between the first charging time and the second charging time to the second charging time.

[0129] For example, when the difference between the first charging time and the second charging time is the absolute value of the difference between the first charging time and the second charging time, the first preset value can be set to 10 minutes, 20 minutes, half an hour or longer.

[0130] For example, when the difference between the first charging time and the second charging time is the absolute value of the ratio of the difference between the first charging time and the second charging time to the second charging time, the first preset value can be set to 10%, 15%, or 20%, etc.

[0131] In this embodiment, if the first charging time is less than the second charging time, and the difference between the first charging time and the second charging time is greater than or equal to a first preset value, it indicates that the charging time of the first battery pack is less than the charging time of the second battery pack, and the difference between the two is relatively large. At this time, energy can be transferred from the first battery pack to the second battery pack to reduce the time difference between the first battery pack charging to the first target SOC and the second battery pack charging to the second target SOC, thereby reducing the charging time of the battery system and improving charging efficiency.

[0132] 420b, when the first charging time is greater than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to a first preset value, controls the second battery pack to transfer energy to the first battery pack.

[0133] As an example, the difference between the first charging time and the second charging time can be the absolute value of the difference between the first charging time and the second charging time; or it can be the absolute value of the ratio of the difference between the first charging time and the second charging time to the first charging time.

[0134] For example, when the difference between the first charging time and the second charging time is the absolute value of the difference between the first charging time and the second charging time, the first preset value can be set to 10 minutes, 20 minutes, half an hour or longer.

[0135] For example, when the difference between the first charging time and the second charging time is the absolute value of the ratio of the first charging time to the second charging time, the first preset value can be set to 10%, 15%, or 20%, etc.

[0136] In this embodiment, if the first charging time is greater than the second charging time, and the difference between the first charging time and the second charging time is greater than or equal to a first preset value, it indicates that the charging time of the first battery pack is greater than the charging time of the second battery pack, and the difference between the two is relatively large. At this time, the second battery pack needs to transfer energy to the first battery pack to reduce the time difference between the first battery pack charging to the first target SOC and the second battery pack charging to the second target SOC, thereby reducing the charging time of the battery system and improving the charging efficiency.

[0137] In some embodiments, a first parameter and a second parameter can be obtained. The first parameter includes a first SOC and a first target SOC, and the second parameter includes a second SOC and a second target SOC. Then, a first charging time is determined based on the first parameter, and a second charging time is determined based on the second parameter. The following continues in conjunction with... Figure 5 An exemplary method for determining the first charging time and the second charging time is provided.

[0138] Figure 5 This is a flowchart illustrating the method for determining the first charging time and the second charging time provided in an embodiment of this application.

[0139] 510, retrieve the first and second parameters.

[0140] The first parameter includes the first SOC and the first target SOC, and the second parameter includes the second SOC and the second SOC.

[0141] As an example, in this embodiment, the current first SOC and first target SOC of the first battery pack, and the current second SOC and second target SOC of the second battery pack can be obtained before the first battery pack and the second battery pack are fully charged.

[0142] 520. Based on the first parameter, determine the first charging time.

[0143] The first charging time is the time it takes for the first battery pack to charge from the first SOC to the first target SOC.

[0144] As an example, the first charging time of the first battery pack can be determined by the amount of charge (such as capacity or energy) corresponding to the first target SOC, and the corresponding charging parameters (such as charging current, charging rate or charging power) of the first battery pack from the first SOC.

[0145] For example, the amount of charge required for the first battery pack, such as capacity, can be determined based on the charging from the first SOC to the first target SOC; the corresponding charging parameters, such as charging current, within the range of charging from the first SOC to the first target SOC can be determined by looking up the correspondence between the first SOC and the first target SOC; and then the first charging time can be determined based on the required charging capacity and charging current.

[0146] The above example can be applied to situations where the charging parameters of the first battery pack do not change much with temperature, such as when the charging parameters of the first battery pack remain basically unchanged with temperature within the range of the first SOC and the first target SOC; or it can also be applied to situations where the charging parameters of the first battery pack change with temperature and the temperature of the first battery pack changes within a very small range, such as when the temperature of the first battery pack is controlled within a very small range by thermal management, and the charging parameters of the first battery pack do not change much within this temperature range.

[0147] 530. Based on the second parameter, determine the second charging time.

[0148] The second charging time is the time it takes for the second battery pack to charge from the second SOC to the second target SOC.

[0149] The method for determining the second charging time is similar to the method for determining the first charging time described above.

[0150] As an example, the second charging time of the second battery pack can be determined based on the amount of charge (such as capacity or energy) corresponding to the second battery pack being charged from the second SOC to the second target SOC, and the corresponding charging parameters (such as charging current or charging power).

[0151] For example, the amount of charge required for the second battery pack, such as capacity, can be determined based on the second SOC charging to the second target SOC; the corresponding charging parameters, such as charging current, within the range of charging from the second SOC to the second target SOC can be determined by looking up the correspondence between the second SOC charging and the second target SOC; and then the second charging time can be determined based on the required amount of charge and the charging parameters.

[0152] The above example can be applied to situations where the charging parameters of the second battery pack do not change much with temperature, such as when the charging parameters of the battery remain basically unchanged with temperature within the range of the second SOC and the second target SOC; or it can also be applied to situations where the charging parameters of the second battery pack change with temperature and the temperature of the second battery pack changes within a very small range, such as when the temperature of the second battery pack is controlled within a very small range by thermal management, and the charging parameters of the second battery pack do not change much within that temperature range.

[0153] In the embodiments of this application, the first charging time of the first battery pack can be accurately estimated based on the first SOC and the first target SOC; and the second charging time of the second battery pack can be accurately estimated based on the second SOC and the second target SOC, thereby reasonably controlling the energy transfer between the first battery pack and the second battery pack based on the first charging time and the second charging time.

[0154] In some embodiments, the first parameter further includes a first temperature of the first battery pack and / or discharge parameters of the charging device, and the second parameter further includes a second temperature of the second battery pack and / or discharge parameters of the charging device, wherein the first temperature is the temperature at which the first battery pack will start charging in the future or the temperature at which it is currently charging, and the second temperature is the temperature at which the second battery pack will start charging in the future or the temperature at which it is currently charging.

[0155] As an example, the discharge parameters of a charging device may include at least one of the following: the discharge power, discharge current, or discharge voltage of the charging device.

[0156] For example, the charging device can be determined as a supercharger, fast charger, or slow charger based on its discharge parameters, thereby determining which of the following modes—supercharger, fast charger, or slow charger—is used for the first and second battery packs.

[0157] As an example, a first charging time can be determined based on a first SOC, a first target SOC, and the discharge parameters of the charging device; and a second charging time can be determined based on a second SOC, a second target SOC, and the discharge parameters of the charging device.

[0158] For example, the charging mode of the first battery pack can be determined based on the discharge parameters of the charging device. Then, the charging parameters, such as the charging current, corresponding to the first battery pack from the first SOC to the first target SOC in the charging mode can be determined. Finally, the first charging time can be determined based on the amount of electricity corresponding to the first SOC to the first target SOC and the charging parameters.

[0159] Similarly, the second charging time of the second battery pack can also be determined in this way. The charging mode (supercharging, fast charging, or slow charging) of the second battery pack can be determined based on the discharge parameters of the charging device. Then, the charging parameters, such as the charging current, corresponding to the second battery pack's charge from the second SOC to the second target SOC in that charging mode can be determined. Finally, the second charging time is determined based on the charge level corresponding to the second SOC to the second target SOC and the charging parameters.

[0160] As above, this example can be applied to situations where the charging parameters of the second battery pack do not change significantly with temperature; or it can be applied to situations where the charging parameters of the second battery pack change with temperature and the temperature control of the second battery pack (e.g., through thermal management control) varies within a fixed and very small range.

[0161] As an example, a first charging time can be determined based on a first SOC, a first target SOC, and a first temperature; and a second charging time can be determined based on a second SOC, a second target SOC, and a second temperature.

[0162] If, before charging the first and second battery packs, energy transfer is controlled from the battery pack with the shorter charging time to the battery pack with the longer charging time, then the first temperature of the first battery pack refers to its temperature when charging begins in the future, and the second temperature of the second battery pack refers to its temperature when charging begins in the future. For example, the temperature of the first battery pack at the start of charging can be changed through thermal management, so that the temperature of the first battery pack at the start of charging is different from its temperature before charging.

[0163] If, during the charging process of the first and second battery packs, energy is transferred from the battery pack with the shorter charging time to the battery pack with the longer charging time, then the first temperature of the first battery pack refers to the current temperature of the first battery pack, and the second temperature of the second battery pack refers to the current temperature of the second battery pack.

[0164] For example, the charging parameters of the first battery pack from the first SOC to the first target SOC change with the temperature and SOC, and the temperature of the first battery pack will change significantly during the charging process.

[0165] Therefore, the SOC interval between the first SOC and the first target SOC can be divided into multiple smaller intervals. Then, based on the first temperature, the temperature corresponding to each SOC interval is estimated. Based on the SOC and temperature of each SOC interval, the charging parameters (such as the charging rate) of the first battery pack in each SOC interval are determined. Then, based on each SOC interval and its corresponding charging parameters, the charging time of the first battery pack in each SOC interval is determined. Finally, the charging times of each SOC interval are summed to determine the first charging time of the first battery pack.

[0166] Alternatively, the temperature-SOC-charging parameter correspondence of the first battery pack can be divided into multiple small intervals, with the temperature change corresponding to ΔT for each temperature interval and the SOC change corresponding to each SOC interval as ΔSOC. Charging parameters such as charging current can be determined for the first battery pack at the first temperature and first SOC. Based on this charging current, the temperature rise rate of the first battery pack at the first SOC and first temperature can be determined. Then, based on the charging current and ΔSOC, the time Δt1 required for the first battery pack to charge from the first SOC to ΔSOC can be determined; and based on the temperature rise rate and ΔT, the time Δt2 required for the first battery pack to heat up from the first temperature to ΔT can be determined. If Δt1 > Δt2, the updated SOC = the original SOC (first SOC) + the SOC change corresponding to Δt2 when charged with the above charging current, and the updated temperature = the original temperature (first temperature) + ΔT. Δt2 is used as the charging time required for the original SOC to change to the updated SOC. If Δt1 < Δt2, the updated SOC = the original SOC (first SOC) + ΔSOC, and the updated temperature = the original temperature (first temperature) + the current temperature rise rate × Δt1. Δt1 is used as the charging time required for the original SOC to change to the updated SOC. The updated SOC and updated temperature are used as the original SOC and original temperature to calculate the next updated temperature. This process is iterated until the SOC reaches the first target SOC. The charging time required for each change from the original SOC to the updated SOC is summed to obtain the charging time for the first battery pack to charge from the first SOC to the first target SOC at the first temperature.

[0167] Similarly, the charging time of the second battery pack from the second SOC to the second target SOC can also be obtained in this way.

[0168] As an example, a first charging time can be determined based on a first SOC, a first target SOC, discharge parameters of the charging device, and a first temperature; and a second charging time can be determined based on a second SOC, a second target SOC, discharge parameters of the charging device, and a second temperature.

[0169] For example, the charging parameters of the first battery pack from the first SOC to the first target SOC change with the temperature and SOC, and the temperature of the first battery pack will change significantly during the charging process.

[0170] Therefore, based on the discharge parameters of the charging device, it can be determined which charging mode (supercharging, fast charging, or slow charging) the first battery pack should use for charging. The first charging time required for the charging device to charge from the first temperature and first SOC to the first target SOC under that charging mode can be determined. The calculation method for the first charging time can refer to the calculation method for the charging time of the first battery pack from the first SOC to the first target SOC (the charging parameters change with temperature and SOC) described above, and will not be repeated here.

[0171] In the embodiments of this application, the temperature of the first battery pack and the temperature of the second battery pack may be the same or different, and the embodiments of this application do not limit this.

[0172] In this embodiment, the first charging time of the first battery pack can be determined based on the first SOC, the first target SOC, the first temperature of the first battery pack, and / or the discharge parameters of the charging device; and the second charging time of the second battery pack can be determined based on the second SOC, the second target SOC, the second temperature of the second battery pack, and / or the discharge parameters of the charging device. In addition to considering the current SOC and target SOC of each battery pack, the temperature of each battery pack and / or the discharge parameters of the corresponding charging device are also considered, thereby enabling accurate determination of the first charging time and the second charging time.

[0173] Figure 6 This is a flowchart illustrating the battery system energy management method provided in an embodiment of this application. Figure 6 The method shown can be applied to battery systems including a first battery pack and a second battery pack, such as... Figure 1 The battery system shown has a bidirectional power module connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently.

[0174] 610, determine the first charging time and the second charging time.

[0175] The first charging time is the time it takes for the first battery pack to charge from the first SOC to the first target SOC, and the second charging time is the time it takes for the second battery pack to charge from the second SOC to the second target SOC.

[0176] The content of step 610 can be found in the relevant description of step 210, and will not be repeated here.

[0177] 620, when the difference between the first charging time and the second charging time is greater than or equal to a first preset value, control the battery pack with the shorter charging time in the first battery pack and the second battery pack to transfer energy to the battery pack with the longer charging time.

[0178] The content of step 620 can be found in the relevant description of step 320, and will not be repeated here.

[0179] 630. During the energy transfer process from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first and second battery packs, the third charging time and the fourth charging time are determined.

[0180] The third charging time is the time it takes for the first battery pack to charge from the third SOC to the first target SOC, and the fourth charging time is the time it takes for the second battery pack to charge from the fourth SOC to the second target SOC.

[0181] In this embodiment, due to changes in the charge levels and SOC of the first and second battery packs, the charging time for the first and second battery packs to reach the target SOC (first target SOC, second target SOC) changes. Specifically, the charging time for the first battery pack changes from a first charging time to a third charging time, and the charging time for the second battery pack changes from a second charging time to a fourth charging time.

[0182] As an example, the third SOC can be the overall SOC of the first battery pack, and the fourth SOC can be the overall SOC of the second battery pack.

[0183] Alternatively, the third SOC can be the minimum SOC and / or minimum voltage of a single cell in the first battery pack, and the fourth SOC can be the minimum SOC and / or minimum voltage of a single cell in the second battery pack.

[0184] As an example, changes in the charge and SOC of the first and second battery packs can include the following scenarios:

[0185] The first method involves controlling the energy transfer between the battery packs before charging the first and second battery packs. The battery pack with the shorter charging time transfers energy to the battery pack with the longer charging time. During this energy transfer, the charging device does not yet charge the battery system. Because of the energy transfer, the charge levels of the first and second battery packs change, thus altering their charging times.

[0186] The second method involves controlling the energy transfer from the battery pack with the shorter charging time to the battery pack with the longer charging time before charging the first and second battery packs. If this energy transfer process takes some time, the charging device begins charging the battery system. Due to the energy transfer and the charging process, the charge levels of the first and second battery packs change, thus altering their charging times.

[0187] The third method involves controlling the energy transfer from the battery pack with the shorter charging time to the battery pack with the longer charging time during the charging process of the first and second battery packs. Simultaneously, the charging device charges the battery system. Due to the energy transfer and the charging process, the charge levels of the first and second battery packs change, thus altering their charging times.

[0188] That is, in this embodiment, during the energy transfer process from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first battery pack and the second battery pack, the charging time of the first battery pack from the current third SOC to the first target SOC is determined, and the charging time of the second battery pack from the current fourth SOC to the second target SOC is determined.

[0189] 640, when the difference between the third charging time and the fourth charging time is less than or equal to the second preset value, control the battery pack with the shorter charging time in the first battery pack and the second battery pack to stop transferring energy to the battery pack with the longer charging time.

[0190] The second preset value is less than or equal to the first preset value.

[0191] In this embodiment, the difference between the third charging time and the fourth charging time is a positive value.

[0192] In this embodiment, during the energy transfer process, or during the energy transfer and charging process of the battery system, if the difference between the charging time of the first battery pack from the current SOC to the first target SOC and the charging time of the second battery pack from the current SOC to the second target SOC decreases, and decreases to less than or equal to a second preset value, the battery pack with the shorter charging time in the first battery pack and the second battery pack can be controlled to stop transferring energy to the battery pack with the longer charging time.

[0193] As an example, the difference between the third charging time and the fourth charging time can be the absolute value of the difference between the third charging time and the fourth charging time; or it can be the absolute value of the ratio of the difference between the third charging time and the fourth charging time to the third charging time (or the fourth charging time).

[0194] For example, when the difference between the third charging time and the fourth charging time is the absolute value of the difference between the third charging time and the fourth charging time, the second preset value can be set to 10 minutes, 20 minutes, half an hour or longer.

[0195] For example, when the difference between the third charging time and the fourth charging time is the absolute value of the ratio of the difference between the third charging time and the fourth charging time to the third charging time (or the fourth charging time), the first preset value can be set to 10%, 15%, or 20%, etc.

[0196] In this embodiment, during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first and second battery packs, when the difference between the charging times of the first and second battery packs decreases to less than or equal to a second preset value, the battery pack with the shorter charging time can be controlled to stop transferring energy to the battery pack with a longer charging time. In this way, the difference in charging time between the first and second battery packs can be controlled within a preset range, preventing continuous energy transfer between the two battery packs and reducing the possibility of excessive energy transfer from the first to the second battery pack, which could lead to an increase in the charging time of the battery system.

[0197] As an example, if the third charging time is less than or equal to the fourth charging time, and the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, the first battery pack can be controlled to stop transferring energy to the second battery pack.

[0198] For example, the difference between the third charging time and the fourth charging time can be the difference between the third charging time and the fourth charging time; or it can be the ratio of the difference between the third charging time and the fourth charging time to the third charging time.

[0199] In this embodiment, during the energy transfer process from the first battery pack to the second battery pack, when the charging time of the first battery pack is less than or equal to the charging time of the second battery pack, and the difference between the two is reduced to less than or equal to a second preset value, the first battery pack can be controlled to stop transferring energy to the second battery pack. This can control the difference in charging time between the first and second battery packs within a preset range, preventing the first battery pack from continuously transferring energy to the second battery pack. This reduces the increase in battery system charging time caused by excessive energy transfer from the first battery pack to the second battery pack, and significantly reduces the energy transfer time from the first battery pack to the second battery pack, thereby improving the performance of both the first and second battery packs.

[0200] Optionally, if the third charging time is greater than the fourth charging time and the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, the first battery pack can be controlled to stop transferring energy to the second battery pack.

[0201] For example, the difference between the third charging time and the fourth charging time can be the difference between the fourth charging time and the third charging time; or it can be the ratio of the difference between the fourth charging time and the third charging time to the fourth charging time.

[0202] As an example, if the third charging time is greater than or equal to the fourth charging time, and the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, the second battery pack can be controlled to stop transferring energy to the first battery pack.

[0203] In this embodiment, during the energy transfer process from the second battery pack to the first battery pack, when the charging time of the first battery pack is greater than the charging time of the second battery pack, and the difference between the two is reduced to less than or equal to a second preset value, the second battery pack can be controlled to stop transferring energy to the first battery pack. This can control the difference in charging time between the first and second battery packs within a preset range, preventing the second battery pack from continuously transferring energy to the first battery pack. This reduces the increase in battery system charging time caused by excessive energy transfer from the second battery pack to the first battery pack, and significantly reduces the energy transfer time from the second battery pack to the first battery pack, thereby improving the performance of both the first and second battery packs.

[0204] Optionally, if the third charging time is less than the fourth charging time and the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, the second battery pack can be controlled to stop transferring energy to the first battery pack.

[0205] Figure 7This is a flowchart illustrating the battery system energy management method provided in an embodiment of this application. Figure 7 The method shown can be applied to battery systems including a first battery pack and a second battery pack, such as... Figure 1 The battery system shown has a bidirectional power module connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently.

[0206] 710, determine the first charging time and the second charging time.

[0207] The first charging time is the time it takes for the first battery pack to charge from the first SOC to the first target SOC, and the second charging time is the time it takes for the second battery pack to charge from the second SOC to the second target SOC.

[0208] 720a, when the first charging time is less than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to a first preset value, controls the first battery pack to transfer energy to the second battery pack.

[0209] 720b, when the first charging time is greater than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to a first preset value, controls the second battery pack to transfer energy to the first battery pack.

[0210] 730. During the energy transfer process from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first and second battery packs, the third charging time and the fourth charging time are determined.

[0211] That is, during the energy transfer process from the first battery pack to the second battery pack, or during the energy transfer process from the second battery pack to the first battery pack, the third charging time and the fourth charging time are determined.

[0212] The third charging time is the time it takes for the first battery pack to charge from the third SOC to the first target SOC, and the fourth charging time is the time it takes for the second battery pack to charge from the fourth SOC to the second target SOC.

[0213] 740a, when the third charging time is less than or equal to the fourth charging time, and the difference between the third charging time and the fourth charging time is less than or equal to the second preset value, the first battery pack is controlled to stop transferring energy to the second battery pack.

[0214] 740b, when the third charging time is greater than or equal to the fourth charging time, and the difference between the third charging time and the fourth charging time is less than or equal to the second preset value, the second battery pack is controlled to stop transferring energy to the first battery pack.

[0215] The second preset value is less than the first preset value.

[0216] The contents of steps 710 to 740 can be found in the relevant descriptions above, and will not be repeated here.

[0217] In some embodiments, before determining the third charging time and the fourth charging time, the method further includes: during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first battery pack and the second battery pack, acquiring a third parameter and a fourth parameter, wherein the third parameter includes a third SOC and a first target SOC, and the fourth parameter includes a fourth SOC and a second target SOC; then determining the third charging time based on the third parameter; and determining the fourth charging time based on the fourth parameter. The following continues in conjunction with... Figure 8 The method for determining the third charging time and the fourth charging time provided in the embodiments of this application will be described by way of example.

[0218] 810, retrieve the third and fourth parameters.

[0219] The third parameter includes the third SOC and the first target SOC, and the fourth parameter includes the fourth SOC and the second target SOC.

[0220] In this embodiment, during the energy transfer process from the first battery pack to the second battery pack or from the second battery pack to the first battery pack, the current third SOC and the first target SOC of the first battery pack, as well as the current fourth SOC and the second target SOC of the second battery pack, can be obtained.

[0221] As an example, during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first and second battery packs, the state between the charging device and the battery system can include the following situations:

[0222] During the energy transfer process from the first battery pack to the second battery pack or from the second battery pack to the first battery pack, the charging device has not yet started charging the battery system. Alternatively, if a period of time has passed during the energy transfer process from the first battery pack to the second battery pack or from the second battery pack to the first battery pack, the charging device begins charging the battery system. Or, while the energy transfer is happening from the first battery pack to the second battery pack or from the second battery pack to the first battery pack, the charging device is also charging the battery pack.

[0223] 820, based on the third parameter, determine the third charging time.

[0224] In this embodiment, the charging time for the first battery pack to charge from the current third SOC to the first target SOC can be determined.

[0225] The method for determining the third charging time in step 820 is similar to the method for determining the first charging time in step 520. Simply replace the first SOC in step 520 with the third SOC to obtain the method for determining the third charging time; for simplicity, this application will not elaborate further here.

[0226] 830, based on the fourth parameter, determine the fourth charging time.

[0227] In this embodiment, the charging time for the second battery pack to charge from the current fourth SOC to the second target SOC can be determined.

[0228] The method for determining the fourth charging time in step 830 is similar to the method for determining the second charging time in step 530 above. Simply replace the second SOC in step 530 with the fourth SOC to obtain the method for determining the fourth charging time. For simplicity, this application will not elaborate further here.

[0229] In the embodiments of this application, during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first battery pack and the second battery pack, the third charging time of the first battery pack can be accurately estimated based on the third SOC and the first target SOC; and the fourth charging time of the second battery pack can be accurately estimated based on the fourth SOC and the second target SOC, thereby reasonably controlling the cessation of energy transfer between the first battery pack and the second battery pack based on the third charging time and the fourth charging time.

[0230] In some embodiments, the third parameter further includes the third temperature of the first battery pack and / or the discharge parameter of the charging device, and the fourth parameter further includes the fourth temperature of the second battery pack and / or the charging parameter of the charging device, wherein the third temperature is the temperature at which the first battery pack will start charging in the future or the temperature at which it is currently charging, and the fourth temperature is the temperature at which the second battery pack will start charging in the future or the temperature at which it is currently charging.

[0231] If, during the energy transfer process from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first and second battery packs, the charging device has not yet charged the battery system, then the third temperature is the temperature corresponding to when the first battery pack starts charging in the future (when the SOC of the first battery pack starts charging is the third SOC), and the fourth temperature is the temperature corresponding to when the second battery pack starts charging in the future. For example, the temperatures of the first and second battery packs can be changed through thermal management when charging begins, and the temperature at the start of charging is different from the temperature before charging.

[0232] If, during the energy transfer process from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first and second battery packs, the charging device is charging the battery system, then the third temperature is the current temperature of the first battery pack, and the fourth temperature is the current temperature of the second battery pack.

[0233] As an example, the third charging time can be determined based on the current third SOC of the first battery pack, the first target SOC, and the discharge parameters of the charging device. Similarly, the fourth charging time can be determined based on the current fourth SOC of the second battery pack, the second target SOC, and the discharge parameters of the charging device.

[0234] The method for determining the third charging time in this example is similar to the method described above for determining the first charging time based on the first SOC, the first target SOC, and the discharge parameters of the charging device. The only difference is that the first SOC in determining the first charging time is replaced with the third SOC. For the sake of brevity, this application will not elaborate further.

[0235] Similarly, the method for determining the fourth charging time in this example is similar to the method described above for determining the second charging time based on the second SOC, the second target SOC, and the discharge parameters of the charging device. The only difference is that the second SOC in determining the second charging time is replaced with the fourth SOC. For the sake of brevity, this application will not elaborate further.

[0236] As an example, the third charging time can be determined based on the current third SOC, the first target SOC, and the third temperature of the first battery pack. Similarly, the fourth charging time can be determined based on the fourth SOC, the second target SOC, and the fourth temperature of the second battery pack.

[0237] The method for determining the third charging time in this example is similar to the method described above for determining the first charging time based on the first SOC, the first target SOC, and the first temperature. The only difference is that the first SOC in the method described above is replaced with the third SOC, and the first temperature is replaced with the third temperature. For the sake of brevity, this application will not elaborate further.

[0238] Similarly, the method for determining the fourth charging time in this example is similar to the method described above for determining the second charging time based on the second SOC, the second target SOC, and the second temperature. The only difference is that the second SOC in determining the second charging time is replaced with the fourth SOC, and the second temperature is replaced with the fourth temperature. For the sake of brevity, this application will not elaborate further.

[0239] As an example, the third charging time can be determined based on the current third SOC, first target SOC, third temperature of the first battery pack, and the discharge parameters of the charging device. Similarly, the fourth charging time can be determined based on the current fourth SOC, second target SOC, fourth temperature of the second battery pack, and the discharge parameters of the charging device.

[0240] The method for determining the third charging time in this example is similar to the method described above for determining the first charging time based on the first SOC, the first target SOC, the first temperature, and the discharge parameters of the charging device. The only difference is that the first SOC in the method described above is replaced with the third SOC, and the first temperature is replaced with the third temperature. For the sake of brevity, this application will not elaborate further.

[0241] Similarly, the method for determining the fourth charging time in this example is similar to the method described above for determining the second charging time based on the second SOC, the second target SOC, the second temperature, and the discharge parameters of the charging device. The only difference is that the second SOC in determining the second charging time is replaced with the fourth SOC, and the second temperature is replaced with the fourth temperature. For the sake of brevity, this application will not elaborate further here.

[0242] In this embodiment, the third charging time of the first battery pack can be determined based on the third SOC, the first target SOC, and the third temperature of the first battery pack and / or the discharge parameters of the charging device; and the fourth charging time of the second battery pack can be determined based on the fourth SOC, the second target SOC, and the fourth temperature of the second battery pack and / or the discharge parameters of the charging device. In addition to considering the current SOC and target SOC of each battery, the temperature of each battery pack and / or the discharge parameters of the corresponding charging device are also considered, thereby enabling accurate determination of the third and fourth charging times.

[0243] In some embodiments, both the first battery pack and the second battery pack are energy-type batteries, or both the first battery pack and the second battery pack are power-type batteries.

[0244] Among them, power batteries can provide power output to meet the demand for large amounts of energy in a short period of time, and can be used in the electric drive system of electrical equipment, such as for acceleration and hill climbing. Energy batteries can store as much energy as possible and are suitable for electrical equipment that requires a longer driving range.

[0245] In this embodiment of the application, both the first battery pack and the second battery pack are configured as energy-type batteries or power-type batteries, which can simplify the design of the battery system.

[0246] In some embodiments, the first battery pack is an energy-type battery and the second battery pack is a power-type battery; or, the first battery pack is a power-type battery and the second battery pack is an energy-type battery.

[0247] In this embodiment of the application, the first battery pack and the second battery pack are configured as different types of batteries, which enables the battery system to meet different usage scenarios.

[0248] 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.

[0249] The battery system energy management method of the present application embodiment has been described in detail above. The following will be combined with… Figure 9 The battery system of the embodiments of this application is described in detail. The technical features described in the method embodiments are applicable to the following battery system embodiments.

[0250] Figure 9 This is a schematic block diagram of the battery system 4000 provided in an embodiment of this application. Figure 9 The battery system 4000 includes some or all of the following components.

[0251] The battery system 4000 includes a first battery pack and a second battery pack, and a bidirectional power module is connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently.

[0252] The battery system 4000 also includes a determination unit 4010 and a control unit 4020.

[0253] The determining unit 4010 is used to determine a first charging time and a second charging time, wherein the first charging time is the time for the first battery pack to charge from a first SOC to a first target SOC, and the second charging time is the time for the second battery pack to charge from a second SOC to a second target SOC; the control unit 4020 is used to control the battery pack with the shorter charging time to transfer energy to the battery pack with the longer charging time before the first battery pack and the second battery pack have finished charging, based on the first charging time and the second charging time.

[0254] In some embodiments, the control unit 4020 is specifically configured to control the battery pack with the shorter charging time in the first battery pack and the second battery pack to transfer energy to the battery pack with the longer charging time when the difference between the first charging time and the second charging time is greater than or equal to a first preset value.

[0255] In some embodiments, the control unit 4020 is specifically configured to control the first battery pack to transfer energy to the second battery pack when the first charging time is less than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to a first preset value; or, when the first charging time is greater than the second charging time and the difference between the first charging time and the second charging time is greater than or equal to the first preset value, control the second battery pack to transfer energy to the first battery pack.

[0256] In some embodiments, the battery system 4000 further includes: an acquisition unit 4030, configured to acquire a first parameter and a second parameter, the first parameter including a first SOC and a first target SOC, and the second parameter including a second SOC and a second target SOC; and a determination unit 4010, specifically configured to determine a first charging time based on the first parameter and a second charging time based on the second parameter.

[0257] In some embodiments, the first parameter further includes a first temperature of the first battery pack and / or discharge parameters of the charging device, and the second parameter further includes a second temperature of the second battery pack and / or discharge parameters of the charging device, wherein the first temperature is the temperature at which the first battery pack will start charging in the future or the temperature at which it is currently charging, and the second temperature is the temperature at which the second battery pack will start charging in the future or the temperature at which it is currently charging.

[0258] In some embodiments, the determining unit 4010 is further configured to determine a third charging time and a fourth charging time during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first battery pack and the second battery pack, wherein the third charging time is the time for the first battery pack to charge from a third SOC to a first target SOC, and the fourth charging time is the time for the second battery pack to charge from a fourth SOC to a second target SOC; the control unit 4020 is further configured to control the battery pack with a shorter charging time to stop transferring energy to the battery pack with a longer charging time when the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, wherein the second preset value is less than or equal to the first preset value.

[0259] In some embodiments, the control unit 4020 is specifically configured to control the first battery pack to stop transferring energy to the second battery pack when the third charging time is less than or equal to the fourth charging time and the difference between the third charging time and the fourth charging time is less than or equal to a second preset value; or, when the third charging time is greater than or equal to the fourth charging time and the difference between the third charging time and the fourth charging time is less than or equal to the second preset value, control the second battery pack to stop transferring energy to the first battery pack.

[0260] In some embodiments, the battery system 4000 further includes: an acquisition unit 4030, configured to acquire a third parameter and a fourth parameter during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first battery pack and the second battery pack, wherein the third parameter includes a third SOC and a first target SOC, and the fourth parameter includes a fourth SOC and a second target SOC; and a determination unit 4010, specifically configured to determine a third charging time based on the third parameter and a fourth charging time based on the fourth parameter.

[0261] In some embodiments, the third parameter further includes the third temperature of the first battery pack and / or the discharge parameters of the charging device, and the fourth parameter further includes the fourth temperature of the second battery pack and / or the discharge parameters of the charging device, wherein the third temperature is the temperature at which the first battery pack will start charging in the future or the temperature at which it is currently charging, and the fourth temperature is the temperature at which the second battery pack will start charging in the future or the temperature at which it is currently charging.

[0262] In some embodiments, both the first battery pack and the second battery pack are energy-type batteries, or both the first battery pack and the second battery pack are power-type batteries.

[0263] In some embodiments, the first battery pack is an energy-type battery and the second battery pack is a power-type battery; or, the first battery pack is a power-type battery and the second battery pack is an energy-type battery.

[0264] It should be understood that the above and other operations and / or functions of the various modules in the battery system 4000 are for the purpose of achieving Figures 2 to 8 For the sake of brevity, the corresponding processes in each method will not be elaborated here.

[0265] Figure 10 A schematic block diagram of a battery management system 5000 according to an embodiment of this application is shown. Figure 10 As shown, the battery management system 5000 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.

[0266] The memory 5020 can be a separate device independent of the processor 5010, or it can be integrated into the processor 5010.

[0267] Optionally, such as Figure 10 As shown, the battery management system 5000 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.

[0268] 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.

[0269] 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.

[0270] Figure 11 and Figure 12 A schematic diagram of the electrical equipment provided in the embodiments of this application.

[0271] like Figure 11 As shown, the electrical equipment 6000 includes a load 6100 and a battery system 4000, wherein the battery system 4000 is connected to the load 6100 and is used to supply power to the load 6100.

[0272] As an example, the battery system 4000 is used to provide DC power to the load 6100, the voltage of which is greater than a voltage threshold. That is, the load 6100 is a high-voltage load, and the battery system 4000 can provide high-voltage power to the load 6100.

[0273] As an example, electrical equipment may also include other loads such as low-voltage loads.

[0274] like Figure 12As shown, the electrical equipment 6000 includes a first load 6010, a second load 6020, and a battery system 4000. The battery system 4000 is connected to the first load 6010 to provide a first DC power to the first load 6010, and / or the battery system 6020 is connected to the second load to provide a second DC power to the second load 6020. The voltage of the first DC power is greater than the voltage of the second DC power.

[0275] 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.

[0276] For details on the 4000 battery system, please refer to the above text. Figure 9 For the sake of brevity, the relevant descriptions in the original document will not be repeated here.

[0277] This application also provides a computer-readable storage medium for storing computer programs.

[0278] When the computer program is run on a computer, it causes the computer to perform the various methods of the embodiments of this application.

[0279] This application also provides a computer program product, including computer program instructions.

[0280] 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.

[0281] This application also provides a computer program.

[0282] When the computer program is run on a computer, it causes the computer to perform the various methods of the embodiments of this application.

[0283] 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.

[0284] Those skilled in the art will clearly 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] 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.

[0289] 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 battery system energy management method, characterized in that, The method is applicable to a battery system including a first battery pack and a second battery pack, wherein a bidirectional power module is connected between the first battery pack and the second battery pack, and the first battery pack and the second battery pack can output energy independently. The method includes: A first charging time and a second charging time are determined, wherein the first charging time is the time for the first battery pack to charge from a first SOC to a first target SOC, and the second charging time is the time for the second battery pack to charge from a second SOC to a second target SOC. Before the first battery pack and the second battery pack are fully charged, based on the first charging time and the second charging time, control the battery pack with the shorter charging time to transfer energy to the battery pack with the longer charging time in the first battery pack and the second battery pack. The step of controlling the energy transfer from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first battery pack and the second battery pack according to the first charging time and the second charging time includes: When the difference between the first charging time and the second charging time is greater than or equal to a first preset value, the battery pack with the shorter charging time in the first battery pack and the second battery pack is controlled to transfer energy to the battery pack with the longer charging time. The method further includes: During the energy transfer process from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first battery pack and the second battery pack, a third charging time and a fourth charging time are determined. The third charging time is the time for the first battery pack to charge from the third SOC to the first target SOC. The fourth charging time is the time for the second battery pack to charge from the fourth SOC to the second target SOC. If the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, the battery pack with the shorter charging time in the first battery pack and the second battery pack is controlled to stop transferring energy to the battery pack with the longer charging time, wherein the second preset value is less than or equal to the first preset value.

2. The method according to claim 1, characterized in that, The step of controlling the energy transfer from the battery pack with the shorter charging time to the battery pack with the longer charging time in the first battery pack and the second battery pack according to the first charging time and the second charging time includes: If the first charging time is less than the second charging time, and the difference between the first charging time and the second charging time is greater than or equal to a first preset value, control the first battery pack to transfer energy to the second battery pack; or... When the first charging time is greater than the second charging time, and the difference between the first charging time and the second charging time is greater than or equal to the first preset value, the second battery pack is controlled to transfer energy to the first battery pack.

3. The method according to claim 1, characterized in that, Before determining the first charging time and the second charging time, the method further includes: Obtain a first parameter and a second parameter, wherein the first parameter includes the first SOC and the first target SOC, and the second parameter includes the second SOC and the second target SOC; Determining the first charging time and the second charging time includes: The first charging time is determined based on the first parameter; The second charging time is determined based on the second parameter.

4. The method according to claim 3, characterized in that, The first parameter further includes a first temperature of the first battery pack and / or a discharge parameter of the charging device, and the second parameter further includes a second temperature of the second battery pack and / or a discharge parameter of the charging device, wherein the first temperature includes the temperature of the first battery pack when it will start charging in the future or the temperature when it is currently charging, and the second temperature includes the temperature of the second battery pack when it will start charging in the future or the temperature when it is currently charging.

5. The method according to claim 2, characterized in that, When the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, controlling the battery pack with the shorter charging time in the first battery pack and the second battery pack to stop transferring energy to the battery pack with the longer charging time includes: If the third charging time is less than or equal to the fourth charging time, and the difference between the third charging time and the fourth charging time is less than or equal to the second preset value, the first battery pack is controlled to stop transferring energy to the second battery pack; or... If the third charging time is greater than or equal to the fourth charging time, and the difference between the third charging time and the fourth charging time is less than or equal to the second preset value, the second battery pack is controlled to stop transferring energy to the first battery pack.

6. The method according to claim 1, characterized in that, Before determining the third charging time and the fourth charging time, the method further includes: Obtain a third parameter and a fourth parameter, wherein the third parameter includes the third SOC and the first target SOC, and the fourth parameter includes the fourth SOC and the second target SOC; Determining the third charging time and the fourth charging time includes: The third charging time is determined based on the third parameter; The fourth charging time is determined based on the fourth parameter.

7. The method according to claim 6, characterized in that, The third parameter also includes the third temperature of the first battery pack and / or the discharge parameters of the charging device, and the fourth parameter also includes the fourth temperature of the second battery pack and / or the discharge parameters of the charging device, wherein the third temperature is the temperature of the first battery pack when it will start charging in the future or the temperature when it is currently charging, and the fourth temperature is the temperature of the second battery pack when it will start charging in the future or the temperature when it is currently charging.

8. A battery system, characterized in that, The battery system includes a first battery pack and a second battery pack, the first battery pack and the second battery pack are connected by a bidirectional power module, and the first battery pack and the second battery pack can output energy independently. The battery system also includes: A determining unit is used to determine a first charging time and a second charging time, wherein the first charging time is the time for the first battery pack to charge from a first SOC to a first target SOC, and the second charging time is the time for the second battery pack to charge from a second SOC to a second target SOC. The control unit is configured to, before the first battery pack and the second battery pack are fully charged, control the battery pack with the shorter charging time to transfer energy to the battery pack with the longer charging time, based on the first charging time and the second charging time. The control unit is specifically used to control the battery pack with the shorter charging time in the first battery pack and the second battery pack to transfer energy to the battery pack with the longer charging time when the difference between the first charging time and the second charging time is greater than or equal to a first preset value. The determining unit is further configured to determine a third charging time and a fourth charging time during the energy transfer process from the battery pack with a shorter charging time to the battery pack with a longer charging time in the first battery pack and the second battery pack, wherein the third charging time is the time for the first battery pack to charge from the third SOC to the first target SOC, and the fourth charging time is the time for the second battery pack to charge from the fourth SOC to the second target SOC. The control unit is further configured to, when the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, control the battery pack with the shorter charging time in the first battery pack and the second battery pack to stop transferring energy to the battery pack with the longer charging time, wherein the second preset value is less than or equal to the first preset value.

9. The battery system according to claim 8, characterized in that, Both the first battery pack and the second battery pack are energy-type batteries, or both the first battery pack and the second battery pack are power-type batteries.

10. The battery system according to claim 8, characterized in that, The first battery pack is an energy-type battery, and the second battery pack is a power-type battery; or... The first battery pack is a power battery, and the second battery pack is an energy battery.

11. A battery management system, characterized in that, The battery management system includes a memory and a processor, the memory being used to store instructions, and the processor being used to read the instructions and execute the method as described in any one of claims 1 to 7 according to the instructions.

12. An electrical appliance, characterized in that, The electrical equipment includes: load; And a battery system as described in any one of claims 8 to 10, the battery system being connected to the load for supplying power to the load.

13. An electrical appliance, characterized in that, The electrical equipment includes: First load; Second load; And a battery system as described in any one of claims 8 to 10, the battery system being connected to the first load for providing a first direct current to the first load, and / or, 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.

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