Battery management systems, methods, batteries, vehicles, devices, media, and products

Abstract

The application provides a battery management system, method, battery, vehicle, device, medium and product, and belongs to the battery field. The battery management system comprises a first detection circuit, a second detection circuit and a controller; the first detection circuit is used for acquiring a first state parameter of a first battery pack; the second detection circuit is used for acquiring a second state parameter of a second battery pack; the controller is signal-connected with the first detection circuit and the second detection circuit respectively, and the controller is configured to, in response to a difference between the first state parameter and the second state parameter being greater than a first threshold value, set a priority of the battery pack corresponding to a larger one of the first state parameter and the second state parameter in a charging stage and / or a priority of the battery pack in a discharging stage to be higher than that of the other battery pack. The application is beneficial to improving the service life of the whole battery, thereby more flexibly and reliably meeting diversified power consumption demands.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery management system, method, battery, vehicle, device, medium and product. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] With the continuous development of technology, the power consumption scenarios of electrical devices are becoming increasingly diverse, and the power demand is also becoming more varied. Batteries usually have one energy compartment, but the battery capacity of a single energy compartment is difficult to meet the diverse power demand. Moreover, a single energy compartment lacks redundancy backup. Once a failure occurs, the electrical device will not be able to work. Therefore, there is an urgent need for improvement. Summary of the Invention

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery management system, method, battery, vehicle, device, medium, and product to improve the flexibility and reliability of battery energy supply.

[0005] An embodiment of the first aspect of this application provides a battery management system for managing a power battery. The power battery includes a first battery pack and a second battery pack connected via a bidirectional converter. The battery management system includes a first detection circuit, a second detection circuit, and a controller. The first detection circuit is used to acquire a first state parameter of the first battery pack, which characterizes the health state of the first battery pack. The second detection circuit is used to acquire a second state parameter of the second battery pack, which characterizes the health state of the second battery pack. The controller is signal-connected to the first detection circuit and the second detection circuit, respectively. The controller is configured to, in response to a difference between the first state parameter and the second state parameter being greater than a first threshold, set the priority of the battery pack corresponding to the larger of the first state parameter and the second state parameter during the charging phase and / or the discharging phase to be higher than that of the other battery pack.

[0006] In the technical solution of this application embodiment, the aging difference of the battery packs is evaluated by comparing the state parameters that characterize the health status of the two battery packs, and the charging and discharging priority of the battery packs is adjusted according to the aging difference. This can coordinate and balance the aging degree of the battery packs, prevent the aging difference between the two from expanding, and help improve the overall service life of the battery, thereby more flexibly and reliably meeting diverse power needs.

[0007] In some embodiments, the controller is further configured to: determine the priority of the first battery pack and the second battery pack during the charging phase and / or the priority during the discharging phase based on the rated capacity of the battery packs, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold. Adjusting the charging and discharging priorities based on the rated capacity when the state parameters are similar can better match battery capacity with power demand, maximizing the advantages of battery packs with different capacities and improving the overall battery performance.

[0008] In some embodiments, the controller is further configured to: in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, set the priority of the battery pack with the larger rated capacity in the charging phase and / or discharging phase to be higher than that of the battery pack with the smaller rated capacity. Setting a higher charging or discharging priority for the battery pack with the larger rated capacity allows the large-capacity battery to reasonably bear the load, leverage its capacity and cycle performance advantages, reduce the risk of excessive cycling of the small-capacity battery pack, facilitate synchronous degradation of both, and improve the overall performance of the battery.

[0009] In some embodiments, the controller is further configured to: during the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, acquire the state of charge (SOC) of the first battery pack with a larger rated capacity; and in response to the SOC of the first battery pack being greater than a second threshold, control the first battery pack to preferentially discharge externally until the SOC of the first battery pack is less than or equal to the second threshold. Large-capacity batteries not only store more energy but also have advantages such as strong cycle tolerance and stable output power. Prioritizing the use of large-capacity batteries when their energy is sufficient can reduce the switching frequency of the bidirectional converter, reduce capacity conversion losses, and lower the failure probability of small-capacity batteries.

[0010] In some embodiments, the controller is further configured to: during the discharge phase, in response to the first battery pack's state of charge being less than or equal to a second threshold and the second battery pack's state of charge being greater than a third threshold, control the second battery pack to charge the discharging first battery pack, or switch to the second battery pack discharging externally; wherein the third threshold is greater than the second threshold. By replenishing the first battery pack or switching the power supply source, the risk of over-discharge of the first battery pack is reduced, the continuity of battery power supply is improved, which helps extend battery life, flexibly respond to different power demands, and improve energy utilization efficiency.

[0011] In some embodiments, the power battery is applied to a vehicle, and the controller is further configured to: during the discharge phase, in response to the difference between a first state parameter and a second state parameter being less than or equal to a first threshold, acquire the vehicle's driving state; the driving state includes intelligent driving mode, commuting mode, or long-distance mode; in response to the vehicle being in intelligent driving mode, maintain the state of charge of the second battery pack with a smaller rated capacity greater than or equal to a fourth threshold; in response to the vehicle being in commuting mode, control the first battery pack with a larger rated capacity to discharge externally until the state of charge of the first battery pack is less than or equal to a second threshold, then switch to the second battery pack discharging externally; and in response to the vehicle being in long-distance mode, control the first battery pack and the second battery pack to discharge externally together according to the ratio of their remaining charge. Controlling the discharge mode of the battery pack according to different driving states can meet more diverse power demands and improve the energy utilization efficiency of the battery.

[0012] In some embodiments, the controller is further configured to: charge the first battery pack and the second battery pack according to priority from high to low during the charging phase; and, in response to a charging power exceeding the power demand of the higher-priority battery pack, use the portion of the charging power exceeding the power demand to charge the lower-priority battery pack. Based on determining the charging sequence according to priority, the charging control logic is further optimized by combining the relationship between charging power and power demand, thereby improving battery charging efficiency.

[0013] In some embodiments, the controller is further configured to, during the discharge phase, control the other of the first and second battery packs to discharge externally in response to a failure in one of the first and second battery packs. The two battery packs can serve as redundant backups for each other, thereby improving the continuity and reliability of battery power supply.

[0014] An embodiment of the second aspect of this application provides a battery control method applied to a battery management system for managing a power battery. The power battery includes a first battery pack and a second battery pack connected via a bidirectional converter. The battery control method includes:

[0015] Obtain the first state parameters of the first battery pack and the second state parameters of the second battery pack; the first state parameters and the second state parameters are used to characterize the health status of the corresponding battery packs.

[0016] In response to the difference between the first state parameter and the second state parameter being greater than a first threshold, the priority of the battery pack corresponding to the larger of the first state parameter and the second state parameter during the charging phase and / or the discharging phase is set to be higher than that of the other battery pack.

[0017] In the technical solution of this application embodiment, the aging difference of the battery packs is evaluated by comparing the state parameters of the two battery packs, and the charging and discharging priority of the battery packs is adjusted according to the aging difference. This can coordinate and balance the aging degree of the battery packs, prevent the aging difference between the two from expanding, and help improve the overall service life of the battery, thereby more flexibly and reliably meeting diverse power needs.

[0018] In some embodiments, the method further includes: in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, determining the priority of the first battery pack and the second battery pack during the charging phase and / or the priority during the discharging phase based on the rated capacity of the battery packs. When the state parameters are similar, adjusting the charging and discharging priorities according to the rated capacity can better match the battery capacity with the power demand, maximize the advantages of battery packs with different capacities, and improve the overall performance of the battery.

[0019] In some embodiments, determining the priority of the first battery pack and the second battery pack during the charging phase and / or discharging phase based on the rated capacity of the battery packs, in response to the difference between the first state parameter and the second state parameter being less than or equal to the first threshold, includes: setting the priority of the battery pack with a larger rated capacity during the charging phase and / or discharging phase to be higher than that of the battery pack with a smaller rated capacity, in response to the difference between the first state parameter and the second state parameter being less than or equal to the first threshold. Setting a higher charging or discharging priority for the battery pack with a larger rated capacity allows the large-capacity battery to reasonably bear the load, leverage its capacity and cycle performance advantages, reduce the risk of excessive cycling of the small-capacity battery pack, facilitate synchronous degradation of both, and improve the overall performance of the battery.

[0020] In some embodiments, the battery control method further includes: during the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, obtaining the state of charge (SOC) of the first battery pack with a larger rated capacity; and in response to the SOC of the first battery pack being greater than a second threshold, controlling the first battery pack to preferentially discharge externally until the SOC of the first battery pack is less than or equal to the second threshold. Large-capacity batteries not only store more energy but also have advantages such as strong cycle tolerance and stable output power. Prioritizing the use of large-capacity batteries when their energy is sufficient can reduce the switching frequency of the bidirectional converter, reduce capacity conversion losses, and lower the failure probability of small-capacity batteries.

[0021] In some embodiments, the battery control method further includes: during the discharge phase, in response to the state of charge of the first battery pack being less than or equal to a second threshold and the state of charge of the second battery pack being greater than a third threshold, controlling the second battery pack to charge the discharging first battery pack, or switching to the second battery pack discharging externally, wherein the third threshold is greater than the second threshold. By replenishing the first battery pack or switching the power supply source, the risk of over-discharge of the first battery pack is reduced, the continuity of battery power supply is improved, which helps to extend battery life, flexibly respond to different power demands, and improve energy utilization efficiency.

[0022] In some embodiments, the power battery is applied to a vehicle; the battery control method further includes: during the discharge phase, in response to the difference between a first state parameter and a second state parameter being less than or equal to a first threshold, acquiring the vehicle's driving state; the driving state includes intelligent driving mode, commuting mode, or long-distance mode; in response to the vehicle being in intelligent driving mode, maintaining the state of charge of the second battery pack with a lower rated capacity greater than or equal to a fourth threshold; in response to the vehicle being in commuting mode, controlling the first battery pack to discharge externally until the state of charge of the first battery pack is less than or equal to a second threshold, switching to the second battery pack discharging externally; and in response to the vehicle being in long-distance mode, controlling the first battery pack and the second battery pack to discharge externally together according to the ratio of their remaining charge. Controlling the battery pack's discharge mode according to different driving states can meet more diverse power demands and improve battery energy utilization efficiency.

[0023] In some embodiments, the battery control method further includes: during the charging phase, charging the first battery pack and the second battery pack according to their priorities from high to low; and in response to a charging power exceeding the power demand of the higher-priority battery pack among the first and second battery packs, using the portion of the charging power exceeding the power demand to charge the lower-priority battery pack among the first and second battery packs. Based on determining the charging sequence according to priority, the charging control logic is further optimized by combining the relationship between charging power and power demand, thereby improving battery charging efficiency.

[0024] In some embodiments, the battery control method further includes: during the discharge phase, in response to a failure in one of the first battery pack and the second battery pack, controlling the other of the first battery pack and the second battery pack to discharge externally. The two battery packs can serve as redundant backups for each other, thereby improving the continuity and reliability of battery power supply.

[0025] An embodiment of the third aspect of this application provides a battery, including a power battery and a battery management system for managing the power battery. The power battery includes a first battery pack and a second battery pack connected via a bidirectional converter. The battery management system is the aforementioned battery management system, or the battery management system is used to execute the aforementioned battery control method.

[0026] An embodiment of the fourth aspect of this application provides a vehicle that includes a battery as described above, the battery being used to provide electrical energy.

[0027] An embodiment of the fifth aspect of this application provides a computing device including at least one processor; and at least one memory communicatively connected to the at least one processor, the at least one memory storing instructions that, when executed individually or jointly by the at least one processor, cause the computing device to perform the battery control method described above.

[0028] An embodiment of the sixth aspect of this application provides a computer-readable storage medium storing instructions that, when executed individually or jointly by one or more processors of a computing device, cause the computing device to perform the battery control method described above.

[0029] An embodiment of the seventh aspect of this application provides a computer program product including instructions that, when executed individually or jointly by one or more processors of a computing device, cause the computing device to perform the battery control method described above.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0032] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0033] Figure 2 This is an exploded structural diagram of a battery according to some embodiments of this application;

[0034] Figure 3 This is a schematic diagram of the battery structure according to some embodiments of this application;

[0035] Figure 4 This is a structural block diagram of a battery management system according to some embodiments of this application;

[0036] Figure 5 Here are flowcharts of battery control methods according to some embodiments of this application;

[0037] Figure 6 This is a flowchart of a battery control method according to some other embodiments of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1000 vehicles;

[0040] Battery 100, control device 200, motor 300;

[0041] Box 10, first part 11, second part 12, battery cell 20;

[0042] First battery pack 110, second battery pack 120, bidirectional converter 130, high voltage power supply connection terminal 140, charging connection terminal 150, battery management system 160, first detection circuit 1601, second detection circuit 1602, controller 1603, battery control method 400. Detailed Implementation

[0043] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0046] 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.

[0047] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0049] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0052] With the continuous development of technology, the power consumption scenarios of electrical devices are becoming increasingly diverse, and the power demand is becoming more diversified. Battery devices usually have an energy compartment. If the battery capacity of a single energy compartment is too large, the cost will increase significantly, while if the capacity is too small, it will be difficult to meet the diverse power demand. Moreover, if a single energy compartment fails, the electrical device will not be able to work, indicating a lack of redundancy design.

[0053] To meet more diverse power demands, this application proposes a power battery comprising a first battery pack and a second battery pack connected via a bidirectional converter. In this way, the two battery packs can function as independent energy storage units for charging and discharging, or they can discharge together, or one battery pack can discharge while the other replenishes its power.

[0054] For cost control, the two battery packs can be designed differently in terms of their chemical systems and the number of individual cells. This results in different voltage platforms for the two battery packs. After being connected via a bidirectional converter, they can both discharge or charge each other, thus balancing power supply capacity and cost. However, the differentiated design of the two battery packs may place higher demands and greater challenges on the energy management of the power battery.

[0055] To balance the cycle performance of different battery packs and improve battery life, this application provides a Battery Management System (BMS) for managing a power battery. The power battery includes a first battery pack and a second battery pack connected via a bidirectional converter. The BMS includes a first detection circuit, a second detection circuit, and a controller. The first detection circuit acquires a first state parameter of the first battery pack, which characterizes the health state of the first battery pack. The second detection circuit acquires a second state parameter of the second battery pack, which characterizes the health state of the second battery pack. The controller is signal-connected to the first and second detection circuits, respectively. The controller is configured to, in response to a difference between the first and second state parameters exceeding a first threshold, prioritize the battery pack corresponding to the larger of the first and second state parameters during the charging and / or discharging phases, setting it higher than the other battery pack.

[0056] By comparing the state parameters of two battery packs, the aging differences between them can be assessed, and the charging and discharging priorities of the battery packs can be adjusted according to these differences. This can coordinate and balance the aging levels of the battery packs, prevent the aging differences between them from widening, and help improve the overall lifespan of the power battery, thereby more flexibly and reliably meeting diverse power needs.

[0057] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices or energy storage devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and batteries disclosed in this application can be used to construct such an electrical device or energy storage device. This helps to improve the overall lifespan of the battery, thereby more flexibly and reliably meeting diverse power needs.

[0058] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0059] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0060] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a control device 200 and a motor 300. The control device 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0061] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] Please refer to Figure 2 , Figure 2This is an exploded structural diagram of a battery provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space. Alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0063] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0064] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0065] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the battery structure provided in some embodiments of this application. Figure 4 This is a structural block diagram of a battery management system provided in some embodiments of this application.

[0066] Battery 100 includes a power battery and a battery management system 160. The power battery includes a first battery pack 110 and a second battery pack 120. The first battery pack 110 and the second battery pack 120 are connected to a high-voltage power supply connection terminal 140 and a charging connection terminal 150 after being connected through a bidirectional converter 130.

[0067] The battery management system 160 is used to manage the battery pack, which includes a first battery pack 110 and a second battery pack 120 connected via a bidirectional converter 130.

[0068] The battery management system 160 includes a first detection circuit 1601, a second detection circuit 1602, and a controller 1603. The first detection circuit 1601 is used to acquire a first state parameter of the first battery pack 110, which is used to characterize the health state of the first battery pack 110. The second detection circuit 1602 is used to acquire a second state parameter of the second battery pack 120, which is used to characterize the health state of the second battery pack 120. The controller 1603 is signal-connected to the first detection circuit 1601 and the second detection circuit 1602, respectively. The controller 1603 is configured to determine the priority of the first battery pack 110 and the second battery pack 120 during the charging phase and / or the discharge phase based on the first state parameter and the second state parameter.

[0069] The first battery pack 110 and the second battery pack 120 can be two relatively independent battery packs, and each battery pack can include multiple battery cells or multiple battery modules.

[0070] The first battery pack 110 and the second battery pack 120 can be two relatively independent energy compartments in the battery 100. For example, the housing 10 of the battery 100 can form two relatively independent receiving cavities for respectively accommodating the first battery pack 110 and the second battery pack 120.

[0071] The rated capacities of the first battery pack 110 and the second battery pack 120 can be the same or different, and their electrode materials can be the same or different. In some embodiments, the first battery pack 110 and the second battery pack 120 have different capacities, so that one or both battery packs can be controlled to provide power according to different power needs. This not only meets diverse power needs, but the two battery packs can also serve as backup power for each other, either to replenish the power of the other battery pack or to partially or even completely replace the other battery pack in providing power.

[0072] It is understood that the power battery may also include three or more battery packs, and any two of the battery packs may serve as the first battery pack 110 and the second battery pack 120 in the embodiments of this application.

[0073] The bidirectional converter 130 can be a bidirectional DC-DC converter (bidirectional DCDC). Its core function is to enable bidirectional current flow between two battery packs with different voltages or states, thereby achieving more flexible battery charging and discharging control.

[0074] The high-voltage power supply connection terminal 140 is used to connect to a load to provide electrical energy to the load. The load may be a vehicle's drive motor, thermal management system, or other high-voltage loads. The charging connection terminal 150 is used to connect to an external charging device to receive electrical energy from the external charging device.

[0075] The first detection circuit 1601 and the second detection circuit 1602 can be two battery data sampling units, mainly used for real-time sampling of battery pack parameters. In some embodiments, the first detection circuit 1601 and the second detection circuit 1602 can be used to collect parameters such as temperature, voltage, and current of the corresponding battery pack. For example, the first detection circuit 1601 and the second detection circuit 1602 can be a cell module controller (CMC).

[0076] The first and second state parameters can be any parameters that characterize the health state of the battery pack, such as voltage, voltage response speed, equalization current, equalization interval time, internal resistance, etc., which can reflect the degree of cell capacity decay and internal resistance increase. For example, the first and second state parameters can be the State of Health (SOH).

[0077] The State of Health (SOH) of a battery pack is a key indicator for measuring the degree of degradation of the battery pack's current performance relative to its brand-new state. It is usually expressed as a percentage, with 100% representing a brand-new state and 0% representing complete failure.

[0078] The SOH of a battery pack can be calculated as the ratio of the current actual usable capacity to the rated capacity (or design capacity) at the time of manufacture. The formula is: SOH = (Current actual capacity / Rated capacity) × 100%. For example, if a brand new battery pack has a rated capacity of 100Ah, and after a period of use, the actual capacity of the battery pack is only 80Ah, then its SOH is 80%.

[0079] The controller 1603 can be a battery management unit (BMU). The controller 1603 is signal-connected to the first detection circuit 1601 and the second detection circuit 1602 respectively. It is used to receive the data collected by the first detection circuit 1601 and the second detection circuit 1602, process the data, and output control commands to instruct the battery pack to charge or discharge.

[0080] The priority of the charging phase refers to the order in which battery packs are charged under the same conditions, from highest to lowest priority. Similarly, the priority of the discharging phase refers to the order in which battery packs with higher priority are discharged first, under the same conditions. By adjusting the priorities of the charging and discharging phases, the number of charge-discharge cycles a battery pack participates in can be adjusted, thereby balancing the differences in health status or cycle life between different battery packs. This ensures that their aging processes are synchronized within a certain range, improving the overall battery life.

[0081] For example, the priority of the battery pack during the charging or discharging phase can be set or adjusted in the software system. That is, a corresponding priority identifier is set in the software system, and during actual charging or discharging, the controller 1603 controls the charging or discharging sequence of the corresponding battery pack according to the corresponding priority identifier. In other examples, the controller 1603 can also determine the preferred charging or discharging target in advance based on the magnitude of the first and second state parameters each time charging or discharging is required, and directly output the corresponding control command, without needing to set the corresponding identifier in the software system.

[0082] By comparing the state parameters of two battery packs, the aging differences between them can be assessed, and the charging and discharging priorities of the battery packs can be adjusted according to these differences. This can coordinate and balance the aging levels of the battery packs, prevent the aging differences between them from widening, and help improve the overall lifespan of the batteries, thereby more flexibly and reliably meeting diverse power needs.

[0083] According to some embodiments of this application, the controller 1603 is configured to: in response to the difference between the first state parameter and the second state parameter being greater than a first threshold, set the priority of the battery pack corresponding to the larger of the first state parameter and the second state parameter during the charging phase and / or the discharging phase to be higher than that of the other battery pack.

[0084] The first threshold can be determined based on factors such as the capacity decay characteristics of the first battery pack 110 and the second battery pack 120, power demand, and BMS detection accuracy.

[0085] If the first threshold is set too low, errors in the detection circuit may lead to incorrect adjustments, or frequent adjustments to the charging and discharging priorities of the battery packs may occur, resulting in repeated switching of charging and discharging priorities and causing fluctuations in system voltage and current. If the first threshold is set too high, the adjustment of the charging and discharging priorities of the two battery packs may not be timely, which may increase the risk of overcharging or over-discharging of the battery pack with lower state parameters, thus dragging down the overall performance of the battery.

[0086] In some embodiments, the first threshold can be between 5% and 15%, for example, it can be 5%, 8%, 10%, 12%, 15% or any two of the above values.

[0087] In some embodiments, the first threshold may be a pre-set fixed value or a threshold that is dynamically adjusted based on the detection results of the BMS. For example, the appropriateness of the first threshold may be determined based on the EIS detection results of the battery pack, and it may be dynamically adjusted to keep the difference in aging degree between the first battery pack 110 and the second battery pack 120 within an acceptable range.

[0088] In this embodiment, when the difference in state parameters exceeds the first threshold, the charging and discharging priority is adjusted, which can better control the aging difference between the two battery packs, thereby improving the overall performance of the battery.

[0089] According to some embodiments of this application, the controller is further configured to: determine the priority of the first battery pack and the second battery pack in the charging phase and / or the priority in the discharging phase based on the rated capacity of the battery pack in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold.

[0090] The rated capacity of a battery pack refers to the minimum usable amount of electricity that the battery pack can release after being fully charged under specified charging and discharging conditions, including charge / discharge rate, temperature, and cutoff voltage. The unit is usually ampere-hour (Ah) or milliampere-hour (mAh).

[0091] The first battery pack 110 and the second battery pack 120 have different rated capacities. In some examples, the electrode assemblies of the individual cells in the first battery pack 110 and the second battery pack 120 can use different chemical systems, such as lithium iron phosphate and ternary lithium systems, respectively. This difference in chemical system may lead to different rated capacities of the battery packs. In other examples, the first battery pack 110 and the second battery pack 120 may also contain different numbers of individual cells or battery modules, which can also result in different rated capacities. By selecting battery pack combinations with different rated capacities, a suitable power supply can be flexibly chosen according to power demand, thereby meeting diverse power needs.

[0092] The specific method for determining the priority of the charging and discharging phases based on rated capacity can be set according to the actual scenario and needs. For example, to ensure that battery packs with different rated capacities reach full charge simultaneously or discharge cutoff voltage simultaneously, the priority of the charging and discharging phases for battery packs with larger rated capacities can be set higher. This allows battery packs of different capacities to be charged or discharged simultaneously as much as possible. In another example, when the battery is in low-battery warning mode, to prevent battery packs with smaller rated capacities from reaching the discharge cutoff threshold first, the priority of the charging phase for battery packs with smaller rated capacities can also be set higher. This can quickly increase the terminal voltage of battery packs with smaller rated capacities, which is beneficial for ensuring the continuous operation of the battery. It is understood that the priorities of the charging and discharging phases can be set synchronously or independently; this application does not impose any restrictions on this.

[0093] When the state parameters are similar, adjusting the charging and discharging priority according to the rated capacity can better match the battery capacity with the power demand, maximize the advantages of battery packs with different capacities, and improve the overall performance of the battery.

[0094] According to some embodiments of this application, the controller is further configured to: in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, set the priority of the battery pack with the larger rated capacity in the charging phase and / or the priority in the discharging phase to be higher than that of the battery pack with the smaller rated capacity in the first battery pack and the second battery pack.

[0095] A battery pack with a larger rated capacity stores more electricity. Given a fixed power demand, a higher-capacity battery pack has a lower depth of discharge, slower aging, and higher charge / discharge efficiency, better meeting the demands of higher power and longer periods of use. Therefore, when two battery packs are at similar aging levels, charging or discharging priorities can be set based on their rated power.

[0096] During the charging phase, the charging connection terminal 150 is connected to the charging pile. The battery management system 160 controls the bidirectional converter 130 to switch to the "high-priority battery pack charging mode" according to the set priority, converting the power provided by the external charging pile into the voltage / current suitable for the high-priority battery pack, thereby realizing priority charging of the high-priority battery pack. When the high-priority battery pack is close to full charge, for example, when the state of charge reaches 95%, the BMS controls the bidirectional converter 130 to switch to the "low-priority battery pack charging mode", diverting the external power to charge the low-priority battery pack, and also monitoring its state of charge and voltage, until the state of charge reaches 95%.

[0097] During the discharge phase, the high-voltage power supply connection terminal 140 is connected to the load. The battery management system 160 controls the bidirectional converter 130 to switch to "high-priority battery pack discharge mode" according to the set priority, allowing the high-priority battery pack to directly supply power to the external load (such as the vehicle motor or energy storage load), while monitoring its discharge current and cutoff voltage. Specifically, if the output power of the high-priority battery pack can fully meet the load demand, only the high-priority battery pack supplies power; if the load power exceeds the maximum output power of the high-priority battery pack, the battery management system 160 controls the bidirectional converter 130 to switch to "dual-battery pack cooperative discharge mode," allowing the low-priority battery pack to convert its voltage through the bidirectional converter 130 and then connect in parallel with the output of the high-priority battery pack to jointly supply power to the load. Setting a higher charging or discharging priority for battery packs with larger rated capacity allows them to reasonably bear the load, leveraging their capacity and cycle performance advantages, reducing the risk of excessive cycling of smaller capacity battery packs, facilitating synchronous degradation of both, and improving the overall performance of the battery.

[0098] According to some embodiments of this application, the controller is further configured to: during the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, acquire the state of charge of the first battery pack with a larger rated capacity; in response to the state of charge of the first battery pack being greater than a second threshold, control the first battery pack to discharge externally preferentially until the state of charge of the first battery pack is less than or equal to the second threshold.

[0099] State of Charge (SOC) is an indicator describing the current remaining charge of a battery, usually expressed as a percentage. The SOC of the first battery pack can be acquired by the first detection circuit 1601 and sent to the controller 1603.

[0100] The second threshold can be set according to the charging and discharging characteristics of the battery pack and specific power consumption needs. In some embodiments, the value of the second threshold can be in the range of 15%-30%, for example, it can be 15%, 20%, 25% or 30%.

[0101] When the state of charge (SOC) of the first battery pack is greater than the second threshold, combined with its high rated capacity, it means that the remaining charge of the first battery pack is relatively sufficient and can more easily meet the power demand. Therefore, the discharge of the first battery pack is prioritized. When the SOC of the first battery pack is less than or equal to the second threshold, it means that the remaining charge of the first battery pack is not much, and continued discharge may lead to power depletion. At this time, it is possible to switch to other battery packs for external discharge.

[0102] Large-capacity batteries not only store more electricity, but also have the advantages of strong cycle tolerance and stable output power. When their power is sufficient, large-capacity batteries should be used to supply power first, which can reduce the number of switching times of the bidirectional converter, reduce power conversion loss, and reduce the failure probability of small-capacity batteries.

[0103] According to some embodiments of this application, the controller is further configured to: during the discharge phase, in response to the state of charge of the first battery pack being less than or equal to a second threshold and the state of charge of the second battery pack being greater than a third threshold, control the second battery pack to charge the first battery pack that is discharging, or switch the second battery pack to discharge externally; wherein the third threshold is greater than the second threshold.

[0104] The third threshold is the energy replenishment threshold of the second battery pack 120. When the SOC of the second battery pack 120 is greater than the third threshold, it is considered that the second battery pack 120 has sufficient power to replenish energy.

[0105] In some examples, the third threshold can range from 20% to 50%, for example, 20%, 30%, 40%, or 50%. In some examples, because the rated capacity of the second battery pack 120 is smaller, the third threshold can be set to be greater than the second threshold.

[0106] In some embodiments, when the battery management system 160 detects that the SOC of the first battery pack 110 is as low as the second threshold and determines that the load still needs to continue to supply power, such as when the vehicle is in motion, the battery management system 160 controls the bidirectional converter 130 to convert the electrical energy of the second battery pack 120 into a voltage suitable for the first battery pack 110, thereby replenishing the first battery pack 110 and improving the range of the first battery pack 110.

[0107] In other embodiments, if the battery management system 160 determines that the load can withstand a brief switch of the power supply, it can also control the bidirectional converter 130 to convert the voltage of the second battery pack 120 to a voltage adapted to the load and disconnect the discharge switch of the first battery pack 110, thereby switching the power supply from the first battery pack 110 to the second battery pack 120.

[0108] Whether the second battery pack 120 is used to replenish the first battery pack 110 or to switch the main power supply can be selected according to the specific power consumption scenario. This application embodiment does not limit this.

[0109] By replenishing the first battery pack or switching the power supply source, the risk of over-discharge of the first battery pack can be reduced, the continuity of external power supply can be improved, the battery life can be extended, different power demands can be flexibly met, and energy utilization efficiency can be improved.

[0110] According to some embodiments of this application, the power battery is applied to a vehicle, and the controller is further configured to: during the discharge phase, in response to the difference between a first state parameter and a second state parameter being less than or equal to a first threshold, acquire the vehicle's driving state; the driving state includes intelligent driving mode, commuting mode, or long-distance mode; in response to the vehicle being in intelligent driving mode, maintain the state of charge of the second battery pack with a smaller rated capacity greater than or equal to a fourth threshold; in response to the vehicle being in commuting mode, control the first battery pack with a larger rated capacity to discharge externally until the state of charge of the first battery pack is less than or equal to a second threshold, then switch to the second battery pack discharging externally; and in response to the vehicle being in long-distance mode, control the first battery pack and the second battery pack to discharge externally together according to the ratio of their remaining charge.

[0111] Driving status refers to the current driving mode of the vehicle. Driving status can be obtained through communication and interaction between the BMS and the vehicle's onboard controller.

[0112] Intelligent driving mode refers to a driving state where the vehicle is in a state that maximizes the intervention of intelligent assistance and reduces the intensity of driving operations. In this mode, the battery prioritizes power supply to the intelligent system. The second battery pack 120 has a lower discharge priority, and the probability of it being completely discharged is low. Furthermore, by controlling the SOC of the second battery pack 120 to be greater than or equal to the fourth threshold, it can serve as a power supply redundancy for the intelligent system, reducing the risk of malfunctions or accidents caused by sudden power outages and improving the reliability of vehicle operation.

[0113] Commuter mode refers to the vehicle's short-distance travel within the city. In this mode, the vehicle operates at a moderate maximum speed (≤80km / h) and frequently starts and stops. At this time, the requirement for continuous power supply is not high, and the main power supply can be switched smoothly during parking intervals or low-speed driving to achieve a longer driving range.

[0114] Long-distance mode refers to a state where the vehicle is continuously traveling at high speeds. In this mode, the vehicle requires the battery to continuously output a large current. At this time, a single battery pack may not be able to meet the power demand. The battery management system 160 allocates the discharge current according to the ratio of the current remaining charge (usually expressed in Ah or SOC) of the first battery pack 110 and the second battery pack 120, so that the two battery packs discharge synchronously according to their respective "power consumption ratios". This allows the two battery packs to release all their power synchronously at the end of the discharge, thereby maximizing the utilization of the total power of the two battery packs and improving energy utilization efficiency.

[0115] By controlling the battery pack's discharge mode according to different driving conditions, more diverse power needs can be met, and the battery's energy utilization efficiency can be improved.

[0116] According to some embodiments of this application, the controller is also configured to: during the charging phase, charge the first battery pack and the second battery pack according to priority from high to low; and in response to the charging power exceeding the required power of the higher priority battery pack among the first and second battery packs, use the portion of the charging power exceeding the required power to charge the lower priority battery pack among the first and second battery packs.

[0117] Charging power refers to the total electrical energy that external charging equipment (such as charging piles and on-board chargers) can provide to the battery system, measured in kilowatts (kW). It represents the total input capacity during the charging process.

[0118] Power demand refers to the maximum charging power that a battery pack currently being charged (usually a higher-priority battery pack) can safely accept under its current state; it is the maximum input limit for the battery pack. In some examples, the lower the battery pack's State of Charge (SOC), the higher the power demand, and vice versa.

[0119] During the charging phase, the battery management system 160 formulates a corresponding charging scheme based on the charging power and the power demand of the high-priority battery pack. For example, when the charging power is less than or equal to the power demand, all the charging power is provided to the high-priority battery pack for charging. When the charging power is greater than the power demand, the battery management system 160 splits the charging power. While meeting the power demand of the high-priority battery pack, the bidirectional converter 130 converts the portion exceeding the power demand into a voltage suitable for the low-priority battery pack, thereby charging the low-priority battery pack simultaneously.

[0120] In some embodiments, the portion of the charging power exceeding the required power may also exceed the required power of the lower priority battery pack. In such cases, the excess power can be actively reduced by the external charging device to avoid overload.

[0121] Based on prioritizing the charging sequence, the charging control logic is further optimized by combining the relationship between charging power and demand power, thereby improving battery charging efficiency.

[0122] According to some embodiments of this application, the controller is also configured to: during the discharge phase, in response to a fault in one of the first battery pack and the second battery pack, control the other of the first battery pack and the second battery pack to discharge externally.

[0123] When one of the battery packs fails, the battery management system 160 can adjust the voltage of the other battery pack to a voltage value that is compatible with the load through the bidirectional converter 130, so that it can continue to supply power to the load.

[0124] In this embodiment, the two battery packs can serve as redundant backups for each other, which can improve the continuity and reliability of battery power supply.

[0125] like Figure 5 As shown, this application embodiment provides a battery control method 400, applied to a battery management system 160. The battery control method 400 includes:

[0126] S410: Obtain the first state parameters of the first battery pack 110 and the second state parameters of the second battery pack 120;

[0127] S420: Determine the priority of the first battery pack 110 and the second battery pack 120 during the charging phase and / or the discharging phase based on the first state parameter and the second state parameter.

[0128] The first and second state parameters can be any parameters that characterize the health state of the battery pack, such as voltage, voltage response speed, equalization current, equalization interval time, internal resistance, etc., which can reflect the degree of cell capacity decay and internal resistance increase. For example, the first and second state parameters can be the State of Health (SOH).

[0129] In step S410, data such as voltage, current, and temperature can be collected in real time through the detection circuit in the battery management system, and the state parameters of the battery pack can be estimated by combining the algorithm. For example, the open-circuit voltage method, impedance analysis method, or large model algorithm based on machine learning can be used to estimate based on the real-time current and voltage curves.

[0130] In step S420, based on the difference in the state parameters of the two battery packs, the difference in their aging levels can be determined, and at least one of the priority of the charging stage and the priority of the discharging stage can be determined accordingly.

[0131] For example, if the state of harmonics (SOH) of the first battery pack 110 is greater than that of the second battery pack 120, the second battery pack 120 is considered to have a higher degree of aging. At least one of the priority of the charging phase and the priority of the discharging phase of the second battery pack 120 can be set to be lower than that of the first battery pack 110. This allows the first battery pack 110 to perform more charge-discharge cycles than the second battery pack 120, thereby reducing the difference in their aging levels.

[0132] In some embodiments, the priority of the charging phase and the priority of the discharging phase of a single battery pack are adjusted synchronously, that is, charging is prioritized while discharging is also prioritized, which is more conducive to the complete control of the number of battery pack cycles.

[0133] It is understood that the battery control method of this application embodiment can be implemented periodically or irregularly throughout the entire life cycle of the battery. For example, it can be automatically executed periodically and the charging priority and discharging priority of the battery pack can be adjusted after a time interval is set, or it can be dynamically executed in real time according to the changes in state parameters.

[0134] It should be noted that the battery in this embodiment may also contain more battery packs, and the battery control method described in this embodiment can be implemented for any two battery packs to determine the priority order among multiple battery packs.

[0135] By comparing the state of harmonics (SOH) of two battery packs, the aging differences between them can be assessed. Based on these differences, the charging and discharging priorities of the battery packs can be adjusted to coordinate and balance the aging levels of the battery packs, preventing the aging differences between them from widening. This helps to improve the overall lifespan of the batteries, thereby more flexibly and reliably meeting diverse power needs.

[0136] According to some embodiments of this application, step S420 includes: in response to the difference between the first state parameter and the second state parameter being greater than a first threshold, setting the priority of the battery pack corresponding to the larger of the first state parameter and the second state parameter in the charging phase and / or the priority in the discharging phase to be higher than that of the other battery pack.

[0137] The first threshold can be determined based on factors such as the capacity decay characteristics of the first battery pack 110 and the second battery pack 120, power demand, and BMS detection accuracy.

[0138] A higher state parameter indicates better battery health, while a lower state parameter indicates worse battery health. For example, the first and second state parameters represent the State of Health (SOH) of the corresponding battery packs. A greater difference in SOH between two battery packs indicates a greater difference in their aging rates. Increasing the charging and / or discharging priority of the battery pack with the higher SOH allows the healthier battery to participate more in the charging and discharging process, while slowing down the aging of the unhealthier battery, thus gradually reducing the aging difference between the two battery packs.

[0139] In this embodiment, when the difference in state parameters exceeds the first threshold, the charging and discharging priority is adjusted, which can better control the aging difference between the two battery packs, thereby improving the overall performance of the battery.

[0140] According to some embodiments of this application, step S420 includes: in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, determining the priority of the first battery pack and the second battery pack in the charging phase and / or the priority in the discharging phase based on the rated capacity of the battery pack.

[0141] When the state parameters of the battery packs are less than or equal to the first threshold, it means that the aging levels of the two battery packs are similar. In this case, frequently adjusting the priority at this stage will increase the computing power consumption of the BMS and the energy loss of the bidirectional converter. Therefore, the charging and discharging priority can be determined based on the rated capacity of the two battery packs.

[0142] In this embodiment, at least one of the charging priority and discharging priority of two battery packs with different rated capacities can be set according to the characteristics of the battery pack and actual needs. For example, the battery pack with the smaller rated capacity has higher fast charging performance. In scenarios where charging time is limited, the charging priority of the battery pack with the smaller rated capacity can be set higher than that of the battery pack with the larger rated capacity, so that more electrical energy can be charged as quickly as possible.

[0143] When the state parameters are similar, adjusting the charging and discharging priority according to the rated capacity can better match the battery capacity with the power demand, maximize the advantages of battery packs with different capacities, and improve the overall performance of the battery.

[0144] According to some embodiments of this application, step S420 includes: in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, setting the priority of the battery pack with a larger rated capacity during the charging phase and / or the priority during the discharging phase to be higher than that of the battery pack with a smaller rated capacity.

[0145] The BMS determines the priority of the charging phase for the first battery pack 110 and the second battery pack 120 based on the differences in State of Harm (SOH) and rated capacity between the two battery packs. In some examples, the battery pack with the larger capacity can be given a higher priority in both the charging and discharging phases than the battery pack with the smaller rated capacity.

[0146] The larger the rated capacity, the more electrical energy the battery pack stores. Under the same power demand, the battery pack with a larger rated capacity will bear the main charging and discharging load, while the battery pack with a smaller capacity will serve as a supplementary or backup power source. This can reduce the cycle pressure and overload risk of the battery pack with a smaller capacity and improve the stability of power output.

[0147] Setting a higher charging or discharging priority for battery packs with larger rated capacity allows them to bear the load reasonably, leveraging their capacity and cycle performance advantages, reducing the risk of excessive cycling for smaller capacity battery packs, facilitating synchronous degradation of both, and improving the overall performance of the battery.

[0148] According to some embodiments of this application, the rated capacity of the first battery pack 110 is greater than the rated capacity of the second battery pack 120; the battery control method 400 further includes:

[0149] During the discharge phase, the SOC of the first battery pack 110 is obtained in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold.

[0150] In response to the SOC of the first battery pack 110 being greater than the second threshold, the first battery pack 110 is controlled to preferentially discharge to the outside until the SOC of the first battery pack 110 is less than or equal to the second threshold.

[0151] When the SOC of the first battery pack 110 is greater than the second threshold, it means that the first battery pack with a larger rated capacity has relatively abundant power. During discharge, the first battery pack 110 is prioritized to supply power to the load.

[0152] The SOC of the first battery pack 110 can be acquired by the first detection circuit 1601. SOC is an indicator reflecting the remaining power of the battery pack. When the SOC of the first battery pack is greater than the second threshold, it can be considered that the remaining power of the battery pack is relatively sufficient, and the first battery pack is given priority to supply power. When the SOC of the first battery pack is lower than the second threshold, it can be considered to switch the battery pack that is given priority to supply power in order to reduce the risk of over-discharge of the first battery pack.

[0153] Large-capacity batteries not only store more electricity, but also have the advantages of strong cycle tolerance and stable output power. When their power is sufficient, large-capacity batteries are used to supply power first, which can reduce the number of switching times of the bidirectional converter 130, reduce power conversion loss, and reduce the failure probability of small-capacity batteries.

[0154] According to some embodiments of this application, the battery control method 400 further includes:

[0155] During the discharge phase, in response to the SOC of the first battery pack 110 being less than or equal to the second threshold and the SOC of the second battery pack 120 being greater than the third threshold, the second battery pack 120 is controlled to charge the first battery pack 110 that is discharging, or the second battery pack 120 is switched to discharge externally, wherein the third threshold is greater than the second threshold.

[0156] In some examples, the second threshold can range from 10% to 20%, and the third threshold can range from 40% to 80%. If the SOC of the first battery pack 110 is less than or equal to the second threshold and the SOC of the second battery pack 120 is greater than the third threshold, it means that the remaining power of the first battery pack 110 is insufficient, while the power of the second battery pack 120 is relatively sufficient. In this case, the second battery pack 120 can be used as a supplementary power source or a backup power source.

[0157] The second battery pack 120 can supply power to the first battery pack 110 to replenish its energy. In this case, the first battery pack 110 still has a higher priority for discharging externally than the second battery pack 120. Alternatively, the second battery pack 120 can directly replace the first battery pack 110 for external discharge. In this case, the second battery pack 120 has a higher discharge priority than the first battery pack 110.

[0158] The embodiments of this application can reduce the risk of over-discharge of the first battery pack by replenishing the first battery pack or switching the power supply main body, improve the continuity of the battery's external power supply, extend the battery's service life, flexibly respond to different power needs, and improve energy utilization efficiency.

[0159] According to some embodiments of this application, the power battery is applied to vehicle 1000, and the rated capacity of the first battery pack 110 is greater than the rated capacity of the second battery pack 120.

[0160] The battery control method 400 also includes:

[0161] During the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to the first threshold, the driving state of vehicle 1000 is obtained; the driving state includes intelligent driving mode, commuting mode or long-distance mode.

[0162] In response to the vehicle being in intelligent driving mode, the SOC of the second battery pack 120 is controlled to be greater than or equal to the fourth threshold.

[0163] In response to the vehicle being in commuting mode, the first battery pack 110 is controlled to discharge externally until the SOC of the first battery pack is less than or equal to a second threshold, at which point the second battery pack is switched to discharge externally; and

[0164] In response to the vehicle being in long-distance mode, the first battery pack 110 and the second battery pack 120 are controlled to discharge together according to the ratio of their remaining charge.

[0165] The power battery is installed in vehicle 1000 and serves as the power source for vehicle 1000 to power its movement. The vehicle's driving state has been described in the previous embodiments and will not be repeated here.

[0166] By controlling the battery pack's discharge mode according to different driving conditions, more diverse power needs can be met, and the battery's energy utilization efficiency can be improved.

[0167] According to some embodiments of this application, the battery control method 400 further includes:

[0168] During the charging phase, the first battery pack 110 and the second battery pack 120 are charged according to their priority from high to low.

[0169] In response to a situation where the charging power exceeds the power demand of the higher-priority battery pack in the first battery pack 110 and the second battery pack 120, the portion of the charging power exceeding the power demand is used to charge the lower-priority battery pack in the first battery pack 110 and the second battery pack 120.

[0170] During charging, the battery management system 160 first identifies and determines the priority of the charging phase of the battery pack. Specifically, it can determine the priority of the charging phase of multiple battery packs by identifying the corresponding identifiers or by executing the control methods described above.

[0171] In this embodiment, the high priority of the battery pack charging stage is not only reflected in the order of charging, but also in the allocation of charging power.

[0172] The embodiments of this application can further optimize the charging control logic by combining the relationship between charging power and demand power, based on the priority-based determination of the charging sequence, thereby improving the charging efficiency of the battery.

[0173] According to some embodiments of this application, the battery control method 400 further includes:

[0174] During the discharge phase, in response to a malfunction in one of the first battery pack 110 and the second battery pack 120, the other of the first battery pack 110 and the second battery pack 120 is controlled to discharge externally.

[0175] In this embodiment, the two battery packs can serve as redundant backups for each other, which can improve the continuity and reliability of battery power supply.

[0176] An embodiment of the third aspect of this application provides a battery 100, including a power battery and a battery management system 160. The power battery includes a first battery pack 110 and a second battery pack 120 connected via a bidirectional converter 130. The battery management system 160 is the battery management system described in any of the above embodiments, or the battery management system 160 is used to execute the battery control method 400 described in any of the above embodiments.

[0177] In some embodiments, the rated capacity of the first battery pack 110 is greater than the rated capacity of the second battery pack 120.

[0178] The battery 100 in this embodiment includes the battery management system 160 described above or a battery management system that can be used to execute the battery control method 400 described above. Therefore, it also has the beneficial effects described in the foregoing embodiments, which will not be repeated here.

[0179] An embodiment of the fourth aspect of this application provides a vehicle 1000, which includes a battery 100 as described above, the battery 100 being used to provide electrical energy.

[0180] The vehicle 1000 of this application embodiment includes the battery 100 described in the above embodiments, and therefore also has the beneficial effects described in the foregoing embodiments, which will not be repeated here.

[0181] This application provides a computing device including: at least one processor; and at least one memory communicatively connected to the at least one processor, wherein the at least one memory stores instructions that, when executed individually or jointly by the at least one processor, cause the computing device to perform the battery control method 400 described in the above embodiments.

[0182] Various embodiments of the systems and technologies described above in this application can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0183] This application provides a computer-readable storage medium storing instructions that, when executed individually or jointly by one or more processors of a computing device, cause the computing device to perform the battery control method 400 described in the above embodiments.

[0184] Computer-readable media can be tangible media that may contain or store programs for use by or in conjunction with an instruction execution system, apparatus, or device. Machine-readable media can be machine-readable signal media or machine-readable storage media. Machine-readable media can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0185] This application provides a computer program product including instructions that, when executed individually or jointly by one or more processors of a computing device, cause the computing device to perform the battery control method 400 described in the above embodiments.

[0186] The technical solution of this application will be further described below with reference to a specific embodiment.

[0187] like Figure 3 and Figure 4 As shown, battery 100 is mounted on vehicle 1000 to provide electrical energy to vehicle 1000. Battery 100 includes a power battery, a bidirectional converter 130, a high-voltage power supply connection terminal 140, a charging connection terminal 150, and a battery management system 160. The power battery includes a first battery pack 110 and a second battery pack 120.

[0188] The first battery pack 110 and the second battery pack 120 are connected through a bidirectional converter 130, and then connected to a high-voltage power supply connection terminal 140 and a charging connection terminal 150. The high-voltage power supply connection terminal 140 is used to connect to a load, and the charging connection terminal 150 is used to connect to an external charging device.

[0189] The battery management system 160 includes a first detection circuit 1601, a second detection circuit 1602, and a controller 1603. The first detection circuit 1601 detects parameters of the first battery pack 110, and the second detection circuit 1602 acquires parameters of the second battery pack 120, including but not limited to voltage, current, temperature, state of charge, and battery health status. The controller 1603 is signal-connected to both the first detection circuit 1601 and the second detection circuit 1602, and determines the priority of the first battery pack 110 and the second battery pack 120 during the charging and / or discharging phases based on the detection results.

[0190] like Figure 6 As shown, the specific control flow of the battery management system 160 is as follows:

[0191] Step S501: Begin.

[0192] Step S502: Obtain the SOH of the first battery pack 110 and the SOH of the second battery pack 120.

[0193] Step S503: Determine whether the SOH difference between the first battery pack 110 and the second battery pack 120 is greater than X%, where X% is the first threshold. If yes, proceed to step S504; otherwise, return to step S502.

[0194] Step S504: Obtain the rated capacity of the first battery pack and the rated capacity of the second battery pack.

[0195] Step S505: Determine whether the rated capacity of the first battery pack is greater than the rated capacity of the second battery pack. If yes, proceed to step S506; otherwise, proceed to step S507.

[0196] Step S506: Set the priority of the first battery pack during the charging phase and the priority during the discharging phase to be higher than that of the second battery pack.

[0197] Step S507: Set the priority of the second battery pack during the charging phase and the priority during the discharging phase to be higher than that of the first battery pack.

[0198] Step S508, End.

[0199] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery management system, characterized in that, The battery management system is used to manage the power battery used in the vehicle. The power battery includes a first battery pack and a second battery pack connected via a bidirectional converter. The battery management system includes: A first detection circuit is used to acquire a first state parameter of the first battery pack, the first state parameter being used to characterize the health status of the first battery pack. A second detection circuit is used to acquire a second state parameter of the second battery pack, the second state parameter being used to characterize the health state of the second battery pack; and A controller, signal-connected to both the first and second detection circuits, is configured to, in response to a difference between the first and second state parameters exceeding a first threshold, prioritize the battery pack corresponding to the larger of the first and second state parameters during the charging and / or discharging phases over the other battery pack; and During the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, and the vehicle being in long-distance mode, the first battery pack and the second battery pack are controlled to discharge together according to the ratio of their remaining charge.

2. The battery management system according to claim 1, characterized in that, The controller is also configured to: In response to the difference between the first state parameter and the second state parameter being less than or equal to the first threshold, the priority of the first battery pack and the second battery pack during the charging phase and / or the discharge phase is determined based on the rated capacity of the battery pack.

3. The battery management system according to claim 2, characterized in that, The controller is also configured to: In response to the difference between the first state parameter and the second state parameter being less than or equal to the first threshold, the priority of the battery pack with the larger rated capacity in the charging phase and / or the priority in the discharging phase of the first battery pack and the second battery pack is set to be higher than that of the battery pack with the smaller rated capacity.

4. The battery management system according to any one of claims 1-3, characterized in that, The controller is also configured to: During the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, the state of charge of the first battery pack with a larger rated capacity is obtained. In response to the first battery pack having a state of charge greater than a second threshold, the first battery pack is controlled to discharge externally preferentially until the state of charge of the first battery pack is less than or equal to the second threshold.

5. The battery management system according to claim 4, characterized in that, The controller is also configured to: During the discharge phase, in response to the first battery pack's state of charge being less than or equal to the second threshold and the second battery pack's state of charge being greater than the third threshold, the second battery pack is controlled to charge the first battery pack that is discharging, or the second battery pack is switched to discharge externally. The third threshold is greater than the second threshold.

6. The battery management system according to any one of claims 1-3, characterized in that, The controller is also configured to: During the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, the driving state of the vehicle is obtained; the driving state includes intelligent driving mode or commuting mode. In response to the vehicle being in the intelligent driving mode, the state of charge of the second battery pack with a smaller rated capacity is maintained to be greater than or equal to the fourth threshold. as well as In response to the vehicle being in the commuting mode, the first battery pack with a larger rated capacity is controlled to discharge externally until the state of charge of the first battery pack is less than or equal to a second threshold, at which point the second battery pack is switched to discharge externally.

7. The battery management system according to any one of claims 1-3, characterized in that, The controller is also configured to: During the charging phase, the first battery pack and the second battery pack are charged according to the priority from high to low. In response to a charging power exceeding the power requirement of the higher-priority battery pack among the first and second battery packs, the portion of the charging power exceeding the power requirement is used to charge the lower-priority battery pack among the first and second battery packs.

8. The battery management system according to any one of claims 1-3, characterized in that, The controller is also configured to: During the discharge phase, in response to a fault in one of the first battery pack and the second battery pack, the other of the first battery pack and the second battery pack is controlled to discharge externally.

9. A battery control method, applied to a battery management system for managing power batteries, characterized in that, The power battery is used in a vehicle, and the power battery includes a first battery pack and a second battery pack connected via a bidirectional converter. The method includes: Obtain the first state parameter of the first battery pack and the second state parameter of the second battery pack, wherein the first state parameter and the second state parameter are used to characterize the health status of the corresponding battery pack; In response to a difference between the first state parameter and the second state parameter exceeding a first threshold, the battery pack corresponding to the larger of the first and second state parameters is assigned a higher priority during the charging and / or discharging phases than the other battery pack; and During the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, and the vehicle being in long-distance mode, the first battery pack and the second battery pack are controlled to discharge together according to the ratio of their remaining charge.

10. The method according to claim 9, characterized in that, The method further includes: In response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, the priority of the first battery pack and the second battery pack during the charging phase and / or the discharge phase is determined based on the rated capacity of the battery pack.

11. The method according to claim 10, characterized in that, The step of determining the priority of the first battery pack and the second battery pack during the charging phase and / or discharging phase based on the rated capacity of the battery pack, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, includes: In response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, the priority of the battery pack with a larger rated capacity during the charging phase and / or the priority during the discharging phase is set to be higher than that of the battery pack with a smaller rated capacity.

12. The method according to any one of claims 9-11, characterized in that, The method further includes: During the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, the state of charge of the first battery pack with a larger rated capacity is obtained. In response to the first battery pack having a state of charge greater than a second threshold, the first battery pack is controlled to discharge externally preferentially until the state of charge of the first battery pack is less than or equal to the second threshold.

13. The method according to claim 12, characterized in that, The method further includes: During the discharge phase, in response to the first battery pack's state of charge being less than or equal to the second threshold and the second battery pack's state of charge being greater than the third threshold, the second battery pack is controlled to charge the first battery pack that is discharging, or the second battery pack is switched to discharge externally. The third threshold is greater than the second threshold.

14. The method according to any one of claims 9-11, characterized in that, The method further includes: During the discharge phase, in response to the difference between the first state parameter and the second state parameter being less than or equal to a first threshold, the driving state of the vehicle is obtained; the driving state includes intelligent driving mode or commuting mode. In response to the vehicle being in the intelligent driving mode, the state of charge of the second battery pack is maintained to be greater than or equal to a fourth threshold; and In response to the vehicle being in the commuting mode, the first battery pack is controlled to discharge externally until the state of charge of the first battery pack is less than or equal to a second threshold, at which point the second battery pack is switched to discharge externally.

15. The method according to any one of claims 9-11, characterized in that, The method further includes: During the charging phase, the first battery pack and the second battery pack are charged according to the priority from high to low. In response to a charging power exceeding the power requirement of the higher-priority battery pack among the first and second battery packs, the portion of the charging power exceeding the power requirement is used to charge the lower-priority battery pack among the first and second battery packs.

16. The method according to any one of claims 9-11, characterized in that, The method further includes: During the discharge phase, in response to a fault in one of the first battery pack and the second battery pack, the other of the first battery pack and the second battery pack is controlled to discharge externally.

17. A battery, characterized in that, include: The power battery includes a first battery pack and a second battery pack connected via a bidirectional converter, and A battery management system for managing the power battery, wherein the battery management system is the battery management system according to any one of claims 1-8, or the battery management system is used to execute the battery control method according to any one of claims 9-16.

18. A vehicle, characterized in that, The vehicle includes the battery as described in claim 17, the battery being used to provide electrical energy.

19. A computing device, characterized in that, include: At least one processor; as well as At least one memory communicatively connected to the at least one processor, the at least one memory storing instructions that, when executed individually or jointly by the at least one processor, cause the computing device to perform the method of any one of claims 9 to 16.

20. A computer-readable storage medium, characterized in that, The device stores instructions that, when executed individually or jointly by one or more processors of the computing device, cause the computing device to perform the method of any one of claims 9 to 16.

21. A computer program product, characterized in that, Includes instructions that, when executed individually or jointly by one or more processors of a computing device, cause the computing device to perform the method of any one of claims 9 to 16.

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