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

Abstract

The embodiment of the present application provides a battery system charging method, a battery system, a battery management system and a power utilization device. The method comprises the following steps: in the process of charging a first battery pack and a second battery pack, determining a first charging time and a second charging time, the first charging time is the required charging time of the first battery pack, and the second charging time is the required charging time of the second battery pack; according to the first charging time and the second charging time, performing target thermal management on the first battery pack and / or the second battery pack, so as to reduce the difference between the charging times of the first battery pack and the second battery pack. The battery system charging 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 charging method, a battery system, a battery management system, and an electrical device. Background Technology

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

[0003] Reducing the charging time and increasing the charging rate of the battery system during the charging process can decrease the user's charging wait time and improve the user experience. Summary of the Invention

[0004] This application provides a battery system charging 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 charging method is provided, applicable to a battery system including a first battery pack and a second battery pack. The method includes: during the charging process of the first battery pack and the second battery pack, determining a first charging time and a second charging time, wherein the first charging time is the time required for the first battery pack and the second charging time is the charging time required for the second battery pack; and performing target thermal management on the first battery pack and / or the second battery pack according to the first charging time and the second charging time to reduce the difference between the charging times of the first battery pack and the second battery pack.

[0006] In this embodiment of the application, during the charging process of the battery system, target thermal management can be performed on the first battery pack and / or the second battery pack based on the first charging time of the first battery pack and the second charging time of the second battery pack to adjust the charging rate of the first battery pack and / or the second battery pack. This can reduce the difference between the charging time of the first battery pack and the second battery pack, so that the first battery pack and the second battery pack can be charged as simultaneously as possible, thereby improving the charging rate of the battery system, reducing the user's charging waiting time, and enhancing the user experience.

[0007] In one possible implementation, target thermal management is performed on the first battery pack and / or the second battery pack based on the first charging time and the second charging time, including: when the difference between the first charging time and the second charging time is greater than or equal to a first preset value, target thermal management is performed on the first battery pack or the second battery pack to increase the charging current or charging rate of the first battery pack, or to increase the charging current or charging rate of the second battery pack.

[0008] 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, targeted thermal management can be performed on either the first or second battery pack to increase the charging current or charging rate of the first or second battery pack. That is, increasing the charging current or charging rate of the battery pack with the longer charging time in the first or second battery pack, thereby reducing the charging time of that battery pack, thus reducing the difference in charging time between the first and second battery packs, and consequently reducing the charging time of the battery system and improving charging efficiency.

[0009] In one possible implementation, target thermal management is performed on the first battery pack and / or the second battery pack based on a first charging time and a second charging time. This includes: performing target thermal management on 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 a first preset value, in order to increase the charging current or charging rate of the first battery pack; or performing target thermal management on 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 the first preset value, in order to increase the charging current or charging rate of the second battery pack.

[0010] In this embodiment, when the charging time of the first battery pack is greater than that of the second battery pack, and the difference is significant, targeted thermal management can be applied to the first battery pack to increase its charging current or charging rate, thereby reducing its charging time. Alternatively, when the charging time of the first battery pack is less than that of the second battery pack, and the difference is significant, targeted thermal management can be applied to the second battery pack to increase its charging current or charging rate, thereby reducing its charging time. In this way, targeted thermal management can be applied to the battery pack with the longer charging time, thereby reducing the charging time of that battery pack, decreasing the difference in charging times between the first and second battery packs, and ultimately 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: acquiring a first parameter and a second parameter, the first parameter including a first SOC, a first temperature and a first target SOC of the first battery pack, and the second parameter including a second SOC, a second temperature and a second target SOC of the second battery pack; 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 reasonably determined according to the first parameter, and the second charging time of the second battery pack can be reasonably determined according to the second parameter, so that the first battery pack and / or the second battery pack can be reasonably thermally managed based on the first charging time and the second charging time.

[0013] In one possible implementation, target thermal management of the first battery pack and / or the second battery pack includes: target thermal management of the first battery pack based on a first SOC and a first temperature.

[0014] In the embodiments of this application, thermal management of the first battery pack can be reasonably performed based on the first SOC and the first temperature, thereby increasing the charging current or charging rate of the first battery pack and reducing the charging time of the first battery pack.

[0015] In one possible implementation, target thermal management of the first battery pack and / or the second battery pack includes: performing target thermal management of the second battery pack based on a second SOC and a second temperature.

[0016] In the embodiments of this application, the second battery pack can be thermally managed reasonably based on the second SOC and the second temperature, thereby increasing the charging current or charging rate of the second battery pack and reducing the charging time of the second battery pack.

[0017] In one possible implementation, the method further includes: during the process of performing target thermal management on the first battery pack or the second battery pack, determining a third charging time and a fourth charging time, wherein the third charging time is the charging time required for the first battery pack and the fourth charging time is the charging time required for the second battery pack; and stopping the target thermal management on the first battery pack or the second battery pack 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 a first preset value.

[0018] In this embodiment, during the charging process of the first and second battery packs, targeted thermal management is performed on either the first or second battery pack to increase the charging current or charging rate, thereby reducing the charging time of the battery pack with the longer charging time. This gradually reduces the difference in charging time between the first and second battery packs. If the difference in charging time between the first and second battery packs decreases to less than or equal to a second preset value, targeted thermal management can be stopped. This reduces the charging time of the battery system, increases the charging rate, and avoids continuous targeted thermal management, thus saving energy.

[0019] 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, target thermal management of the first battery pack or the second battery pack is stopped. This includes: stopping target thermal management of 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; or stopping target thermal management of 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.

[0020] In this embodiment, during the target thermal management of the first battery pack, when the charging time of the first battery pack is greater than or equal to the charging time of the second battery pack, and the difference between the two decreases to less than or equal to a second preset value, the target thermal management of the first battery pack can be stopped in a timely manner; or, during the target thermal management of 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 the two decreases to less than or equal to the second preset value, the target thermal management of the second battery pack can be stopped in a timely manner. Thus, by controlling the difference in charging time between the first and second battery packs within a preset range and reducing the number of charging devices in the charging system, target thermal management of either the first or second battery pack will not be continuously performed, thereby saving energy.

[0021] In one possible implementation, before determining the third charging time and the fourth charging time, the method further includes: acquiring a third parameter and a fourth parameter, the third parameter including a third SOC, a third temperature and a first target SOC of the first battery pack, and the fourth parameter including a fourth SOC, a fourth temperature and a second target SOC of the second battery pack; 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.

[0022] In the embodiments of this application, during the process of performing target thermal management on the first battery pack, the third charging time of the first battery pack can be accurately estimated based on the third SOC, the third temperature and the first target SOC; and the fourth charging time of the second battery pack can be accurately estimated based on the fourth SOC, the fourth temperature and the second target SOC, so that the target thermal management of the first battery pack or the second battery pack can be reasonably stopped based on the difference between the third charging time and the fourth charging time.

[0023] In a second aspect, a battery system is provided, comprising a first battery pack and a second battery pack. The battery system further comprises: a determining unit, configured to determine a first charging time and a second charging time during the charging process of the first battery pack and the second battery pack, wherein the first charging time is the required charging time for the first battery pack and the second charging time is the required charging time for the second battery pack; and a control unit, configured to perform target thermal management on the first battery pack and / or the second battery pack according to the first charging time and the second charging time, so as to reduce the difference between the charging times of the first battery pack and the second battery pack.

[0024] In one possible implementation, the control unit is specifically configured to perform target thermal management on the first battery pack or the second battery pack when the difference between the first charging time and the second charging time is greater than or equal to a first preset value, so as to increase the charging current or charging rate of the first battery pack, or increase the charging current or charging rate of the second battery pack.

[0025] In one possible implementation, the control unit is specifically configured to: perform target thermal management on the first battery pack to increase the charging current or charging rate of 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 a first preset value; or, perform target thermal management on the second battery pack to increase the charging current or charging rate of 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 the first preset value.

[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, a first temperature and a first target SOC of the first battery pack, and the second parameter including a second SOC, a second temperature and a second target SOC of the second battery pack; 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, a control unit is specifically configured to perform target thermal management of the first battery pack based on a first SOC and a first temperature.

[0028] In one possible implementation, a control unit is specifically configured to perform target thermal management of the second battery pack based on a second SOC and a second temperature.

[0029] In one possible implementation, the determining unit is further configured to determine a third charging time and a fourth charging time during the process of performing target thermal management on the first battery pack or the second battery pack, wherein the third charging time is the charging time required for the first battery pack and the fourth charging time is the charging time required for the second battery pack; the control unit is further configured to stop performing target thermal management on the first battery pack or the second battery pack if 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 a first preset value.

[0030] In one possible implementation, the control unit is specifically configured to stop target thermal management of 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 a second preset value; or, to stop target thermal management of 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.

[0031] 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, a third temperature and a first target SOC of the first battery pack, and the fourth parameter including a fourth SOC, a fourth temperature and a second target SOC of the second battery pack; and a determination unit specifically for determining a third charging time based on the third parameter; and determining a fourth charging time based on the fourth parameter.

[0032] 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.

[0033] 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.

[0034] 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 and the second load for providing a first direct current to the first load and 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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

[0039] Figure 1 This is a schematic diagram of a battery system provided in an embodiment of this application.

[0040] Figure 2 This is a schematic flowchart of a battery system charging method provided in an embodiment of this application.

[0041] Figure 3 This is another schematic flowchart of a battery system charging method provided in an embodiment of this application.

[0042] Figure 4 This is another schematic flowchart of a battery system charging method provided in an embodiment of this application.

[0043] Figure 5 This is another schematic flowchart of a battery system charging method provided in an embodiment of this application.

[0044] Figure 6 This is another schematic flowchart of a battery system charging method provided in an embodiment of this application.

[0045] Figure 7 This is another schematic flowchart of a battery system charging method provided in an embodiment of this application.

[0046] Figure 8 This is a flowchart illustrating the process of determining the third charging time and the fourth charging time, provided for an embodiment of this application.

[0047] Figure 9 This is a schematic block diagram of a battery system provided in an embodiment of this application.

[0048] Figure 10 This is a schematic block diagram of a battery management system provided in an embodiment of this application.

[0049] Figure 11 This is a schematic diagram of an electrical device according to an embodiment of this application.

[0050] Figure 12 This is another schematic diagram of the electrical equipment according to an embodiment of this application. Detailed Implementation

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

[0052] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application, are intended to cover non-exclusive inclusion.

[0053] The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

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

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

[0057] 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.

[0058] Setting up independent energy zones ensures stable power output and reduces the likelihood of electrical devices being affected by power failures. This allows another zone to maintain power supply even in the event of a single zone failure, ensuring the continued normal operation of the devices. 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.

[0059] 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 SOC and / or voltage). This causes the overall charging time of the battery system to be consistent with that of the slower-charging batteries in the multiple battery packs, greatly increasing the total charging time required for the battery system.

[0060] To address the aforementioned issues, this application provides a battery system charging 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. The method includes: during the charging process of the first and second battery packs, determining a first charging time and a second charging time, where the first charging time is the required charging time for the first battery pack and the second charging time is the required charging time for the second battery pack; and performing target thermal management on the temperature of the first and / or second battery packs based on the first and second charging times to reduce the difference in charging times between the first and second battery packs.

[0061] This application provides a battery system charging 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 efficiency of the battery system.

[0062] 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.

[0063] The following combination Figure 1 The battery system described above, which has multiple independent energy zones, will be further illustrated with an example.

[0064] 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.

[0065] 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.

[0066] As an example, each energy zone's battery pack can individually power the load of the electrical equipment.

[0067] For example, the first and second battery packs can supply power to the load of the electrical equipment independently.

[0068] 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 power of one battery pack is depleted or fails, the other battery pack can be switched to supply power to the load of the electrical equipment.

[0069] 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.

[0070] As an example, the first and second battery packs can be charged via a charging device.

[0071] As an example, a charging device may include a charging station and / or a charging gun.

[0072] As an example, the first and second battery packs can be charged separately or as a whole.

[0073] 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.

[0074] 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.

[0075] As an example, energy can be transferred between the first battery pack and the second battery pack.

[0076] 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.

[0077] As an example, a battery system may also include a battery management system.

[0078] 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.

[0079] For example, a 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] The following combination Figures 2 to 8 The battery system charging method provided in the embodiments of this application will be described exemplarily.

[0085] Figure 2 This is a schematic flowchart of a battery system charging 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, for example... Figure 1 The battery system shown.

[0086] 210. During the charging process of the first battery pack and the second battery pack, the first charging time and the second charging time are determined.

[0087] The first charging time is the charging time required for the first battery pack, and the second charging time is the charging time required for the second battery pack.

[0088] As an example, during the charging process of the battery system, the first charging time is the time required for the first battery pack to charge from the current first SOC and the current first temperature to the first target SOC, and the second charging time is the time required for the second battery pack to charge from the current second SOC and the current second temperature to the second target SOC.

[0089] The first target SOC refers to the SOC required for the first battery pack to charge from its current state. The second target SOC refers to the SOC required for the second battery pack to charge from its current state.

[0090] 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, respectively.

[0091] 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.

[0092] For example, the second target SOC can be the upper limit of the SOC allowed by the second battery pack. Alternatively, the first target SOC can also be less than the upper limit of the SOC allowed by the second battery pack and / or the upper limit of the allowed voltage.

[0093] 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.

[0094] Alternatively, the first SOC can be the minimum SOC of a single cell in the first battery pack, and the second SOC can be the minimum SOC of a single cell in the second battery pack.

[0095] 220, based on the first charging time and the second charging time, perform targeted thermal management on the first battery pack and / or the second battery pack to reduce the difference in charging time between the first battery pack and the second battery pack.

[0096] Targeted thermal management refers to thermal management based on the first and second charging times to improve the charging rate of the first and / or second battery packs, such as charging rate and charging current. Targeted thermal management may include heating or cooling the battery packs.

[0097] As an example, thermal management could already be implemented during the charging process of the first and second battery packs to control their temperatures within their respective allowable ranges, reducing the impact of excessively high battery temperatures on battery performance and lifespan. This targeted thermal management differs from the original thermal management, which aims to control the temperatures of the first and second battery packs within a relatively large range. If the temperatures of the first and / or second battery packs become too high or too low, thermal management is required. The targeted thermal management, however, is specifically designed to adjust the charging rate of the first and / or second battery packs.

[0098] For example, the first battery pack has an allowable temperature range of -20℃ to 50℃, and the second battery pack has an allowable temperature range of -30℃ to 60℃.

[0099] During the charging process of the first and second battery packs, if the current temperature of the first battery pack is above 50°C, it needs to be cooled; if the current temperature of the first battery pack is below -20°C, it needs to be heated. If the current temperature of the second battery pack is above 60°C, it needs to be cooled; if the current temperature of the second battery pack is below -30°C, it needs to be heated. This heating and cooling under these conditions constitutes the normal thermal management process.

[0100] If, during the charging process, based on the first and second charging times, it is necessary to increase the charging rate of the first and / or second battery packs to reduce the difference in charging time between them, then the temperature of the first battery pack needs to be adjusted to approximately 30°C, and the temperature of the second battery pack needs to be adjusted to approximately 20°C. This temperature adjustment is known as target thermal management.

[0101] As an example, the first and second battery packs do not inherently require thermal management during charging. For instance, during charging, the temperatures of the first and second battery packs are controlled within their respective permissible ranges due to their own heat generation and the influence of ambient temperature. In this case, targeted thermal management of the first and / or second battery packs only needs to be performed based on the first and second charging times.

[0102] It should be understood that the temperature range controlled by the target thermal management of the first battery pack and / or the second battery pack needs to be within the respective allowable temperature range of the first battery pack and / or the second battery pack.

[0103] In this embodiment, the temperature of the first battery pack and / or the second battery pack can be adjusted through targeted thermal management, since the charging current, charging rate, and other parameters of the battery pack are related to its temperature. Therefore, by adjusting the charging current, charging rate, and other parameters of the first battery pack and / or the second battery pack through targeted thermal management, the charging rate of the first battery pack and / or the second battery pack can be adjusted, thereby reducing the difference in charging time between the first battery pack and the second battery pack.

[0104] As an example, target thermal management can be applied to both the first battery pack and the second battery pack based on the first charging time and the second charging time, so that the first battery pack and the second battery pack are respectively adjusted to the temperature corresponding to their respective larger charging current, thereby increasing the charging current of the first battery pack and the second battery pack, while reducing the difference in charging time between the first battery pack and the second battery pack.

[0105] In this embodiment of the application, during the charging process of the battery system, target thermal management can be performed on the first battery pack and / or the second battery pack based on the first charging time of the first battery pack and the second charging time of the second battery pack to adjust the charging rate of the first battery pack and / or the second battery pack. This can reduce the difference between the charging time of the first battery pack and the second battery pack, so that the first battery pack and the second battery pack can be charged as simultaneously as possible, thereby improving the charging rate of the battery system, reducing the user's charging waiting time, and enhancing the user experience.

[0106] Figure 3This is a schematic flowchart of a battery system charging 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, for example... Figure 1 The battery system shown.

[0107] 310. During the charging process of the first battery pack and the second battery pack, determine the first charging time and the second charging time.

[0108] The first charging time is the charging time required for the first battery pack, and the second charging time is the charging time required for the second battery pack.

[0109] The content of step 310 can be found in the relevant description of step 210, and will not be repeated here.

[0110] 320. If the difference between the first charging time and the second charging time is greater than or equal to a first preset value, target thermal management is performed on the first battery pack or the second battery pack to increase the charging current or charging rate of the first battery pack, or to increase the charging current or charging rate of the second battery pack.

[0111] 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.

[0112] 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).

[0113] 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.

[0114] 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, the first preset value can be set to 10%, 15%, or 20%, etc.

[0115] 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, targeted thermal management can be performed on either the first or second battery pack to increase the charging current or charging rate of the first battery pack, or to increase the charging current or charging rate of the second battery pack. That is, the charging current or charging rate of the battery pack with the longer charging time is increased to reduce the charging time of that battery pack, thereby reducing the difference in charging time between the first and second battery packs, and ultimately reducing the charging time of the battery system and improving charging efficiency.

[0116] Figure 4 This is a schematic flowchart of a battery system charging 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, for example... Figure 1 The battery system shown.

[0117] 410. During the charging process of the first battery pack and the second battery pack, determine the first charging time and the second charging time.

[0118] The first charging time is the charging time required for the first battery pack, and the second charging time is the charging time required for the second battery pack.

[0119] The content of step 410 can be found in the relevant description of step 210, and will not be repeated here.

[0120] 420a, 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, target thermal management is performed on the first battery pack to improve the charging current or charging rate of the first battery pack.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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, target thermal management can be performed on the first battery pack to increase the charging current or charging rate of the first battery pack and reduce the charging time of the first battery pack. This reduces 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 overall charging time of the battery system and improving charging efficiency.

[0126] 420b, 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, target thermal management is performed on the second battery pack to improve the charging current or charging rate of the second battery pack.

[0127] 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.

[0128] 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.

[0129] 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, the first preset value can be set to 10%, 15%, or 20%, etc.

[0130] In this embodiment, when the charging time of the first battery pack is greater than that of the second battery pack, and the difference is significant, targeted thermal management can be applied to the first battery pack to increase its charging current or charging rate, thereby reducing its charging time. Alternatively, when the charging time of the first battery pack is less than that of the second battery pack, and the difference is significant, targeted thermal management can be applied to the second battery pack to increase its charging current or charging rate, thereby reducing its charging time. In this way, targeted thermal management can be applied to the battery pack with the longer charging time, thereby reducing the charging time of that battery pack, decreasing the difference in charging time between the first and second battery packs, and ultimately reducing the overall charging time of the battery system and increasing its charging rate.

[0131] In some embodiments, it is also necessary to obtain a first parameter and a second parameter. The first parameter includes a first SOC, a first temperature, and a first target SOC of the first battery pack. The second parameter includes a second SOC, a second temperature, and a second target SOC of the second battery pack. Then, based on the first parameter, a first charging time is determined. And based on the second parameter, a second charging time is determined.

[0132] Continue to combine as follows Figure 5 The battery system charging method described above is given by way of example.

[0133] Figure 5 This is a schematic flowchart of a battery system charging method provided in an embodiment of this application. Figure 5 The method shown can be applied to battery systems including a first battery pack and a second battery pack, for example... Figure 1 The battery system shown.

[0134] 510. During the charging process of the first battery pack and the second battery pack, the first parameter and the second parameter are acquired.

[0135] The first parameter includes the first SOC, first temperature and first target SOC of the first battery pack, and the second parameter includes the second SOC, second temperature and second SOC of the second battery pack.

[0136] In this embodiment, during the charging process of the first battery pack and the second battery pack, the current first SOC, first temperature and first target SOC of the first battery pack, and the current second SOC, second temperature and second target SOC of the second battery pack are obtained.

[0137] 520. Based on the first parameter, determine the first charging time.

[0138] The first charging time is the charging time required for the first battery pack.

[0139] As an example, the first charging time is the time it takes for the first battery pack to charge from the current first SOC and the current first temperature to the first target SOC.

[0140] As an example, the first charging time of the first battery pack can be determined based on the amount of charge and charging current (or charging rate) corresponding to the first battery pack being charged from the first SOC and the first temperature to the first target SOC.

[0141] As an example, electricity can include capacity or energy.

[0142] For ease of description, the following example illustrates how to determine the first charging time by charging the first battery pack from its current first SOC and current first temperature to a first target SOC.

[0143] As an example, the charging current (or charging rate) of the first battery pack from the first SOC to the first target SOC varies with temperature and SOC, and the temperature of the first battery pack will change relatively significantly during the charging process.

[0144] 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 current of the first battery pack in each SOC interval is determined. Then, based on each SOC interval and its corresponding charging current, 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.

[0145] Alternatively, the temperature-SOC-charging current relationship 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. The charging current corresponding to the first battery pack at the first temperature and the first SOC can be determined. Based on this charging current, the temperature rise rate of the first battery pack at the first SOC and the 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 SOC and the next updated temperature. This process is iterated until the SOC of the first battery pack 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 and first temperature to the first target SOC.

[0146] As another example, if the first battery pack has not yet been charged to the first target SOC and the calculated temperature of the first battery pack exceeds its allowable temperature range, thermal management will be implemented to control the problem of the first battery pack within its allowable temperature range. For example, when the first battery pack is charged from the first SOC to a certain SOC (which is less than the first target SOC), thermal management will be implemented on the first battery pack (note that this thermal management is not the target thermal management, but the original thermal management). Therefore, when calculating the charging time of the first battery pack, the time for the first battery pack to charge from the first SOC and first temperature to a certain SOC can be calculated using the above method, and the time for the first battery pack to charge from a certain SOC and the temperature after thermal management to the first target SOC can be calculated using the above iterative calculation method. The sum of these two times (and the time for thermal management temperature adjustment) is then taken as the charging time for the first battery pack to charge from the first SOC and first temperature to the first target SOC.

[0147] In some embodiments, the first parameter may further include the discharge parameters of the charging device for the first battery pack.

[0148] The discharge parameters may include at least one of the following: discharge current, discharge voltage, or discharge power of the charging device (such as a charging pile) connected to the first battery pack, or the charging mode (such as slow charging, fast charging, or supercharging) of the charging device connected to the first battery pack.

[0149] For example, based on the discharge parameters of the charging device, it can be determined which charging mode—slow charging, fast charging, or supercharging—the first battery pack should be charged using. The first charging time required for the charging device to charge from a first temperature and a first state of charge (SOC) to a 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 described above, and will not be repeated here.

[0150] 530. Based on the second parameter, determine the second charging time.

[0151] The second charging time is the charging time required for the second battery pack.

[0152] As an example, the second charging time is the time it takes for the second battery pack to charge from the current second SOC to the second target SOC.

[0153] The method for determining the second charging time is similar to the method for determining the first charging time described above. Therefore, the method for determining the first charging time can be referred to. For the sake of brevity, this application will not elaborate further here.

[0154] In the embodiments of this application, the first charging time of the first battery pack can be accurately estimated based on the first SOC, the first temperature and the first target SOC; and the second charging time of the second battery pack can be accurately estimated based on the second SOC, the second temperature and the second target SOC, thereby reasonably controlling the first battery pack and / or the second battery pack to perform target thermal management based on the first charging time and the second charging time.

[0155] In some embodiments, the second parameter may further include the discharge parameters of the charging device for the second battery pack.

[0156] For example, the discharge parameters may include at least one of the discharge current, discharge voltage, or discharge power of the charging device (such as a charging pile) to which the second battery pack is connected, or the charging mode of the charging device (such as fast charging, full charging, or supercharging).

[0157] The method for determining the second charging time by considering the discharge parameters of the charging device for the second battery pack is similar to the method for determining the first charging time described above. Therefore, the method for determining the first charging time can be referred to. For the sake of brevity, this application will not elaborate further here.

[0158] In the embodiments of this application, the first charging time of the first battery pack can be reasonably determined according to the first parameter, and the second charging time of the second battery pack can be reasonably determined according to the second parameter, so that the first battery pack and / or the second battery pack can be reasonably thermally managed based on the first charging time and the second charging time.

[0159] 540a, 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, target thermal management is performed on the first battery pack to improve the charging current or charging rate of the first battery pack.

[0160] The content of step 540a can be referred to the relevant description in step 420a above, and will not be repeated here.

[0161] In some embodiments, the first battery pack can be subject to targeted thermal management based on a first SOC and a first temperature.

[0162] As an example, 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, the first battery pack can be subject to target thermal management based on the first SOC and the first temperature.

[0163] As an example, a target temperature corresponding to a higher charging current or charging rate for the first battery pack can be determined based on the first state of charge (SOC). Then, target thermal management of the first battery pack can be performed based on this target temperature and the first temperature. For example, if the target temperature is higher than the first temperature, the first battery pack needs to be heated to increase its temperature; if the target temperature is lower than the first temperature, the first battery pack needs to be cooled to decrease its temperature.

[0164] In the embodiments of this application, thermal management of the first battery pack can be reasonably performed based on the first SOC and the first temperature, thereby increasing the charging current or charging rate of the first battery pack and reducing the charging time of the first battery pack.

[0165] 540b, 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, target thermal management is performed on the second battery pack to improve the charging current or charging rate of the second battery pack.

[0166] The content of step 540a can be referred to the relevant description in step 420b above, and will not be repeated here.

[0167] In some embodiments, the second battery pack can be subject to targeted thermal management based on a second SOC and a second temperature.

[0168] As an example, 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, the second battery pack is subjected to target thermal management based on the second SOC and the second temperature.

[0169] As an example, based on the second SOC, the target temperature corresponding to a higher charging current or charging rate for the second battery pack can be determined. Then, target thermal management of the second battery pack can be performed based on this target temperature and the second temperature. If the target temperature is higher than the second temperature, the second battery pack needs to be heated to increase its temperature; if the target temperature is lower than the second temperature, the second battery pack needs to be cooled to decrease its temperature.

[0170] In the embodiments of this application, the second battery pack can be thermally managed reasonably according to the second SOC and the second temperature, thereby increasing the charging current or charging rate of the second battery pack and reducing the charging time of the second battery pack.

[0171] In some embodiments, during the process of performing target thermal management on the first battery pack or the second battery pack, if the difference between the charging time of the first battery pack and the charging time of the second battery pack decreases to a certain extent, the target thermal management on the first battery pack or the second battery pack can be stopped. The following continues in conjunction with... Figure 6 This example will be described in more detail.

[0172] Figure 6 This is a schematic flowchart of a battery system charging method provided in an embodiment of this application. Figure 6 The method shown can be applied to a battery system including a first battery pack and a second battery pack. Figure 1 The battery system shown.

[0173] 610. During the charging process of the first battery pack and the second battery pack, the first charging time and the second charging time are determined.

[0174] The first charging time is the charging time required for the first battery pack, and the second charging time is the charging time required for the second battery pack.

[0175] 620, if the difference between the first charging time and the second charging time is greater than or equal to a first preset value, target thermal management is performed on the first battery pack or the second battery pack to increase the charging current or charging rate of the first battery pack, or to increase the charging current or charging rate of the second battery pack.

[0176] The contents of steps 610 and 620 can be found in the descriptions of steps 210, 310 and 320, and will not be repeated here.

[0177] 630, during the process of performing target thermal management on the first battery pack or the second battery pack, determine the third charging time and the fourth charging time.

[0178] The third charging time is the charging time required for the first battery pack, and the second charging time is the charging time required for the second battery pack.

[0179] As an example, the third charging time is the time it takes for the first battery pack to charge from the current third SOC and the current third temperature to the first target SOC; the fourth charging time is the time it takes for the second battery pack to charge from the current fourth SOC and / or voltage and the current fourth temperature to the second target SOC.

[0180] It should be understood that in this embodiment, the third charging time is the time it takes for the first battery pack to charge from the current state to the first target SOC when the target thermal management is stopped, and the fourth charging time is the time it takes for the second battery pack to charge from the current state to the second target SOC when the target thermal management is stopped.

[0181] As an example, if the first battery pack was originally performing thermal management, after stopping the target thermal management, it will resume its original thermal management. If the first battery pack was not originally performing thermal management, after stopping the target thermal management, the first battery pack will not perform thermal management. The second battery pack follows a similar pattern.

[0182] In this embodiment, during the charging process, the State of Charge (SOC) of the first battery pack and the State of Charge (SOC) of the second battery pack change, causing changes in the charging time for both the first and second battery packs to reach the target SOC (first target SOC, second target SOC). Specifically, the charging time for the first battery pack changes from the original first charging time to a third charging time, and the charging time for the second battery pack changes from the original second charging time to a fourth charging time.

[0183] 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.

[0184] Alternatively, the third SOC can be the minimum SOC of a single cell in the first battery pack, and the fourth SOC can be the minimum SOC of a single cell in the second battery pack.

[0185] 640, if the difference between the third charging time and the fourth charging time is less than or equal to the second preset value, stop the target thermal management of the first battery pack or the second battery pack.

[0186] The second preset value is less than or equal to the first preset value.

[0187] In this embodiment, the difference between the third charging time and the fourth charging time is a positive value.

[0188] 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).

[0189] 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.

[0190] 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 second preset value can be set to 10%, 15%, or 20%, etc.

[0191] In this embodiment, during the charging process of the first and second battery packs, targeted thermal management is performed on either the first or second battery pack to increase the charging current or charging rate of the first or second battery pack. This reduces the charging time of the battery pack with the longer charging time, gradually decreasing the difference in charging time between the first and second battery packs. If the difference in charging time between the first and second battery packs decreases to less than or equal to a second preset value, targeted thermal management can be stopped. This reduces the charging time of the battery system, increases the charging rate, and avoids continuous targeted thermal management, thus saving energy.

[0192] As an example, target thermal management of the first battery pack can be stopped 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.

[0193] 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.

[0194] In this embodiment of the application, during the process of target thermal management of the first battery pack, when the charging time of the first battery pack is greater 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 target thermal management of the first battery pack can be stopped in time, the charging current or charging rate of the first battery pack can be increased, and the charging time of the first battery pack can be reduced. This can control the difference in charging time between the first battery pack and the second battery pack within a preset range, thereby reducing the charging time of the battery system. At the same time, the target thermal management of the first battery pack will not be performed continuously, thus saving energy.

[0195] 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 target thermal management of the first battery pack can be stopped.

[0196] 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.

[0197] As an example, target thermal management of the second battery pack can be stopped 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.

[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 fourth charging time.

[0199] In this embodiment of the application, during the process of target thermal management of 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 target thermal management of the second battery pack can be stopped in time. This can control the difference in charging time between the first battery pack and the second battery pack within a preset range, and at the same time, the target thermal management of the second battery pack will not be performed continuously, which can save energy consumption.

[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 target thermal management of the second battery pack can be stopped.

[0201] 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.

[0202] Figure 7 This is another schematic flowchart of the battery charging method provided in the embodiments of this application. Figure 7 The method shown can be applied to a battery system including a first battery pack and a second battery pack. Figure 1 The battery system shown.

[0203] 710. During the charging process of the first battery pack and the second battery pack, the first charging time and the second charging time are determined.

[0204] The first charging time is the charging time required for the first battery pack, and the second charging time is the charging time required for the second battery pack.

[0205] 720a, 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, target thermal management is performed on the first battery pack to improve the charging current or charging rate of the first battery pack.

[0206] 720b, 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, target thermal management is performed on the second battery pack to improve the charging current or charging rate of the second battery pack.

[0207] 730, during the process of performing target thermal management on the first battery pack or the second battery pack, determine the third charging time and the fourth charging time.

[0208] The third charging time is the charging time required for the first battery pack, and the fourth charging time is the charging time required for the second battery pack.

[0209] 740a, 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 target thermal management of the first battery pack is stopped.

[0210] 740b, 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 target thermal management of the second battery pack is stopped.

[0211] The second preset value is less than the first preset value.

[0212] The descriptions of steps 710 to 740 can be found in the relevant content above, and will not be repeated here.

[0213] In some embodiments, before determining the third charging time and the fourth charging time, a third parameter and a fourth parameter may also be obtained. The third parameter includes the third SOC, the third temperature and the first target SOC of the first battery pack, and the fourth parameter includes the fourth SOC, the fourth temperature and the fourth target SOC of the second battery pack. The third charging time is determined based on the third parameter, and the fourth charging time is determined based on the fourth parameter.

[0214] The following combination Figure 8 An exemplary method for determining the third charging time and the fourth charging time is provided.

[0215] Figure 8 This is a flowchart illustrating the method for determining the third charging time and the fourth charging time provided in an embodiment of this application.

[0216] 810. During the process of target thermal management of the first battery pack, the third and fourth parameters are obtained.

[0217] The third parameter includes the third SOC, third temperature and first target SOC of the first battery pack, and the fourth parameter includes the fourth SOC, fourth temperature and second target SOC of the second battery pack.

[0218] In this embodiment, during the process of performing target thermal management on the first battery pack or the second battery pack, the current third SOC, the current third temperature and the first target SOC of the first battery pack, and the current fourth SOC, the current fourth temperature and the second target SOC of the second battery pack can be obtained.

[0219] 820, based on the third parameter, determine the third charging time.

[0220] In this embodiment, the charging time of the first battery pack from the current third SOC and the current third temperature to the first target SOC can be determined.

[0221] The method for determining the third charging time in step 820 is similar to the method for determining the first charging time described above. Simply replace the first SOC and first temperature with the third SOC and third temperature, respectively, to obtain the method for determining the third charging time. For simplicity, this application will not elaborate further here.

[0222] In some embodiments, the third parameter may also include discharge parameters of the charging device of the first battery pack. For example, at least one of the discharge current, discharge voltage, or discharge power of the charging device (such as a charging pile) to which the first battery pack is connected, or the charging mode of the charging device to which the first battery pack is connected (such as slow charging, fast charging, or supercharging).

[0223] 830, based on the fourth parameter, determine the fourth charging time.

[0224] In this embodiment, the charging time of the second battery pack from the current fourth SOC and the current fourth temperature to the second target SOC can be determined.

[0225] The method for determining the fourth charging time in step 830 is similar to the method for determining the second charging time described above. Simply replace the second SOC and second temperature with the fourth SOC and fourth temperature, respectively, to obtain the method for determining the fourth charging time. For simplicity, this application will not elaborate further here.

[0226] In some embodiments, the fourth parameter may also include discharge parameters of the charging device for the second battery pack. For example, at least one of the discharge current, discharge voltage, or discharge power of the charging device (such as a charging pile) to which the second battery pack is connected, or the charging mode of the charging device to which the second battery pack is connected (such as slow charging, fast charging, or supercharging).

[0227] In the embodiments of this application, during the process of target thermal management of the first battery pack, the third charging time of the first battery pack can be accurately estimated based on the third SOC, third temperature and first target SOC of the first battery pack; and the fourth charging time of the second battery pack can be accurately estimated based on the fourth SOC, fourth temperature and second target SOC of the second battery pack, so that the target thermal management of the first battery pack or the second battery pack can be reasonably stopped based on the difference between the third charging time and the fourth charging time.

[0228] 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.

[0229] The battery energy management method of the embodiments of this application 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.

[0230] Figure 9 This is a schematic block diagram of the battery system provided in an embodiment of this application. Figure 9 The battery system 4000 includes some or all of the following components.

[0231] The battery system 4000 includes a first battery pack and a second battery pack.

[0232] The battery system 4000 also includes a determination unit 4010 and a control unit 4020.

[0233] The determining unit 4010 is used to determine a first charging time and a second charging time during the charging process of the first battery pack and the second battery pack, wherein the first charging time is the charging time required for the first battery pack and the second charging time is the charging time required for the second battery pack; the control unit 4020 is used to perform target thermal management on the first battery pack and / or the second battery pack according to the first charging time and the second charging time, so as to reduce the difference between the charging time of the first battery pack and the second battery pack.

[0234] In some embodiments, the control unit 4020 is specifically configured to perform target thermal management on the first battery pack or the second battery pack when the difference between the first charging time and the second charging time is greater than or equal to a first preset value, so as to increase the charging current or charging rate of the first battery pack or increase the charging current or charging rate of the second battery pack.

[0235] In some embodiments, the control unit 4020 is specifically used to perform target thermal management on the first battery pack to increase the charging current or charging rate of 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 a first preset value; or, 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 the first preset value, to perform target thermal management on the second battery pack to increase the charging current or charging rate of the second battery pack.

[0236] In some embodiments, the battery system further includes: an acquisition unit 4030, configured to acquire a first parameter and a second parameter, the first parameter including a first SOC, a first temperature and a first target SOC of the first battery pack, and the second parameter including a second SOC, a second temperature and a second target SOC of the second battery pack; 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.

[0237] In some embodiments, the control unit 4020 is specifically configured to perform target thermal management on the first battery pack based on a first SOC and a first temperature.

[0238] In some embodiments, the control unit 4020 is specifically configured to perform target thermal management of the second battery pack based on a second SOC and a second temperature.

[0239] In some embodiments, the determining unit 4010 is further configured to determine a third charging time and a fourth charging time during the process of performing target thermal management on the first battery pack or the second battery pack, wherein the third charging time is the charging time required for the first battery pack and the fourth charging time is the charging time required for the second battery pack; the control unit 4020 is further configured to stop performing target thermal management on the first battery pack or the second battery pack if 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 a first preset value.

[0240] In some embodiments, the control unit 4020 is specifically configured to stop target thermal management of 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 a second preset value; or, 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, the control unit 4020 is configured to stop target thermal management of the second battery pack.

[0241] In some embodiments, the battery system further includes: an acquisition unit 4030, configured to acquire a third parameter and a fourth parameter, the third parameter including a third SOC, a third temperature and a first target SOC of the first battery pack, and the fourth parameter including a fourth SOC, a fourth temperature and a second target SOC of the second battery pack; 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.

[0242] 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.

[0243] 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.

[0244] The memory 5020 can be a separate device independent of the processor 5010, or it can be integrated into the processor 5010.

[0245] Optionally, such as Figure 10As shown, the battery management system 5000 may also include a transceiver 5030, which the processor 5010 can control to communicate with other devices. Specifically, it can send information or data to other devices, or receive information or data sent by other devices.

[0246] 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.

[0247] 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.

[0248] like Figure 11 and Figure 12 As shown in the figure, this application embodiment also provides an electrical device 6000.

[0249] 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.

[0250] 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.

[0251] As an example, electrical equipment may also include other loads such as low-voltage loads.

[0252] like Figure 12As shown, the electrical device 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 and the second load 6020, and is used to provide a first DC power to the first load 6010 and a second DC power to the second load 6020, respectively. The voltage of the first DC power is greater than the voltage of the second DC power.

[0253] In other words, the first load is a high-voltage load, and the second load is a low-voltage load. The battery system provides low-voltage power to the first load and high-voltage power to the second load.

[0254] 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.

[0255] This application also provides a computer-readable storage medium for storing computer programs.

[0256] When the computer program is run on a computer, it causes the computer to perform the various methods of the embodiments of this application.

[0257] This application also provides a computer program product, including computer program instructions.

[0258] 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.

[0259] This application also provides a computer program.

[0260] When the computer program is run on a computer, it causes the computer to perform the various methods of the embodiments of this application.

[0261] 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.

[0262] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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 method for charging a battery system, characterized in that, The method is applicable to a battery system including a first battery pack and a second battery pack, and the method includes: During the charging process of the first battery pack and the second battery pack, a first charging time and a second charging time are determined, wherein the first charging time is the charging time required for the first battery pack and the second charging time is the charging time required for the second battery pack. Based on the first charging time and the second charging time, target thermal management is performed on the first battery pack and / or the second battery pack to reduce the difference between the charging times of the first battery pack and the second battery pack. The step of performing target thermal management on the first battery pack and / or the second battery pack based on the first charging time and the second charging time includes: If the difference between the first charging time and the second charging time is greater than or equal to a first preset value, the target thermal management is performed on the first battery pack or the second battery pack to increase the charging current or charging rate of the first battery pack, or to increase the charging current or charging rate of the second battery pack. The method further includes: During the process of performing the target thermal management on the first battery pack or the second battery pack, a third charging time and a fourth charging time are determined, wherein the third charging time is the charging time required for the first battery pack and the fourth charging time is the charging time required for the second battery pack. If the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, the target thermal management of the first battery pack or the second battery pack shall be stopped, 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 performing target thermal management on the first battery pack and / or the second battery pack based on the first charging time and the second charging time includes: 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, the target thermal management is performed on the first battery pack to increase the charging current or charging rate of the first battery pack; or... 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 the first preset value, the target thermal management is performed on the second battery pack to increase the charging current or charging rate of the second 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 a first SOC, a first temperature and a first target SOC of the first battery pack, and the second parameter includes a second SOC, a second temperature and a second target SOC of the second battery pack; 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 targeted thermal management of the first battery pack and / or the second battery pack includes: The target thermal management is performed on the first battery pack based on the first SOC and the first temperature.

5. The method according to claim 3, characterized in that, The targeted thermal management of the first battery pack and / or the second battery pack includes: The target thermal management is performed on the second battery pack based on the second SOC and the second temperature.

6. The method according to claim 1, characterized in that, If the difference between the third charging time and the fourth charging time is less than or equal to a second preset value, the target thermal management of the first battery pack or the second battery pack is stopped, including: 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 target thermal management of the first battery pack shall be stopped; or... 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 target thermal management of the second battery pack shall be stopped.

7. 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. The third parameter includes the third SOC, third temperature and first target SOC of the first battery pack. The fourth parameter includes the fourth SOC, fourth temperature and second target SOC of the second battery pack. 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.

8. A battery system, characterized in that, The battery system includes a first battery pack and a second battery pack, and the battery system further includes: The determining unit is used to determine a first charging time and a second charging time during the charging process of the first battery pack and the second battery pack, wherein the first charging time is the charging time required for the first battery pack and the second charging time is the charging time required for the second battery pack. The control unit is configured to perform target thermal management on the temperature of the first battery pack and / or the second battery pack based on the first charging time and the second charging time, so as to reduce the difference between the charging time of the first battery pack and the second battery pack. The control unit is specifically used for: If the difference between the first charging time and the second charging time is greater than or equal to a first preset value, the target thermal management is performed on the first battery pack or the second battery pack to increase the charging current or charging rate of the first battery pack, or to increase the charging current or charging rate of the second battery pack. The determining unit is further configured to determine a third charging time and a fourth charging time during the process of performing the target thermal management on the first battery pack or the second battery pack, wherein the third charging time is the charging time required for the first battery pack and the fourth charging time is the charging time required for the second battery pack. The control unit is further configured to stop the target thermal management of the first battery pack or the second battery pack 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.

9. 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.

10. An electrical appliance, characterized in that, The electrical equipment includes: load; And the battery system as described in claim 8, wherein the battery system is connected to the load for supplying power to the load.

11. An electrical appliance, characterized in that, The electrical equipment includes: First load; Second load; And the battery system as described in claim 8, wherein the battery system is connected to the first load and the second load, and is respectively used to provide a first DC power to the first load and a second DC power to the second load, wherein the voltage of the first DC power is greater than the voltage of the second DC power.

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