Battery management system and method, battery, vehicle, equipment, medium and product

Abstract

The invention provides a battery management system and method, a battery, a vehicle, equipment, a medium and a product, and belongs to the field of batteries. 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 the first battery pack; the second detection circuit is used for acquiring a second state parameter of the second battery pack; the controller is in signal connection with the first detection circuit and the second detection circuit and is configured to respond to the situation that the difference value between the first state parameter and the second state parameter is larger than a first threshold value. And setting the priority of the battery pack corresponding to the larger one of the first state parameter and the second state parameter in the charging stage and / or the priority of the battery pack corresponding to the larger one of the first state parameter and the second state parameter in the discharging stage to be higher than that of the other battery pack. The service life of the whole battery can be prolonged, so that diversified power utilization requirements can be met more flexibly and reliably.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery management system, method, battery, vehicle, device, medium and product. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of society. Rechargeable batteries have the characteristics of storing or releasing energy as needed, and are widely used in various electric devices or energy storage systems, and are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is an important factor for its development.

[0003] With the continuous development of technology, the power consumption scenarios of electric devices are constantly enriched, and the power consumption demand is more diversified. The battery usually has an energy compartment, and the capacity of a single energy compartment is difficult to meet the diversified power consumption demand, and a single energy compartment lacks redundancy backup. Once a failure occurs, the electric device will not work, so it is urgent to improve. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present 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] Embodiments of the first aspect of the present application provide a battery management system for managing a power battery, the power battery comprising a first battery pack and a second battery pack connected by a bidirectional converter, the battery management system comprising: a first detection circuit, a second detection circuit and a controller; the first detection circuit is configured to obtain a first state parameter of the first battery pack, the first state parameter being used to represent the health state of the first battery pack; the second detection circuit is configured to obtain a second state parameter of the second battery pack, the second state parameter being used to represent the health state of the 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 set the priority of the battery pack corresponding to the larger one of the first state parameter and the second state parameter in the charging stage and / or the priority in the discharging stage to be higher than the other battery pack, in response to the difference between the first state parameter and the second state parameter being greater than a first threshold.

[0006] In the technical solution of the embodiments of the present application, by comparing the state parameters representing the health states of the two battery packs, the aging difference of the battery packs is evaluated, and the priority of charging and discharging of the battery packs is adjusted according to the aging difference, which can coordinate and balance the aging degree of the battery packs, prevent the aging difference from expanding, and help to improve the service life of the battery as a whole, so as to more flexibly and reliably meet the diversified power consumption demand.

[0007] 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 the first threshold value, determine the priority of the first battery pack and the second battery pack in the charging stage and / or the priority of the first battery pack and the second battery pack in the discharging stage according to the rated capacity size of the battery pack. When the state parameters are close, adjusting the charging and discharging priority according to the rated capacity size can better match the battery capacity and the power demand, maximize the advantages of different capacities of the battery packs, and improve the overall performance of the battery.

[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 the first threshold value, set the priority of the battery pack with a larger rated capacity among the first battery pack and the second battery pack in the charging stage and / or the priority of the battery pack with a larger rated capacity among the first battery pack and the second battery pack in the discharging stage to be higher than the battery pack with a smaller rated capacity. Setting the charging priority or the discharging priority of the battery pack with a larger rated capacity to be higher can make the large-capacity battery reasonably bear the load, maximize its capacity and cycle performance advantages, reduce the risk of transition cycles of the small-capacity battery pack, and facilitate the synchronous attenuation of the two, thereby improving the overall performance of the battery.

[0009] In some embodiments, the controller is further configured to, in the discharging stage, in response to the difference between the first state parameter and the second state parameter being less than or equal to the first threshold value, obtain the state of charge of the first battery pack with a larger rated capacity; and in response to the state of charge of the first battery pack being greater than a second threshold value, control the first battery pack to preferentially discharge to the outside until the state of charge of the first battery pack is less than or equal to the second threshold value. The large-capacity battery not only has more storage capacity, but also has the advantages of strong cycle tolerance and stable output power. When the power of the large-capacity battery is sufficient, the large-capacity battery is preferentially used for power supply, which can reduce the switching frequency of the bidirectional converter, reduce the capacity conversion loss, and reduce the failure probability of the small-capacity battery.

[0010] In some embodiments, the controller is further configured to, in the discharging stage, in response to the state of charge of the first battery pack being less than or equal to the second threshold value and the state of charge of the second battery pack being greater than a third threshold value, control the second battery pack to charge the first battery pack that is discharging, or switch the second battery pack to discharge to the outside; and the third threshold value is greater than the second threshold value. By supplementing the power of the first battery pack or switching the power supply subject, the risk of over-discharge of the first battery pack is reduced, the continuity of the battery power supply to the outside is improved, the service life of the battery is prolonged, different power demands are flexibly met, and the energy utilization efficiency is improved.

[0011] In some embodiments, the power battery is applied to a vehicle, and the controller is further configured to: in the discharging phase, in response to a difference between the first state parameter and the second state parameter being less than or equal to a first threshold value, obtaining a driving state of the vehicle; the driving state includes an intelligent driving mode, a commuting mode or a long-distance mode; in response to the vehicle being in the intelligent driving mode, keeping the state of charge of the second battery pack with a smaller rated capacity greater than or equal to a fourth threshold value; in response to the vehicle being in the commuting mode, controlling 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 value, and switching to the second battery pack to discharge externally; and in response to the vehicle being in the long-distance mode, controlling the first battery pack and the second battery pack to discharge externally according to a ratio of the remaining charges of the two battery packs. Controlling the discharging mode of the battery packs according to different driving states can meet more diversified power consumption demands and improve the energy utilization efficiency of the battery.

[0012] In some embodiments, the controller is further configured to: in the charging phase, charging the first battery pack and the second battery pack according to the priority from high to low; and in response to the charging power exceeding the required power of the battery pack with a higher priority among the first battery pack and the second battery pack, using the part of the charging power exceeding the required power to charge the battery pack with a lower priority among the first battery pack and the second battery pack. On the basis of determining the charging sequence based on the priority, the charging control logic is further optimized in combination with the relationship between the charging power and the required power, thereby improving the charging efficiency of the battery.

[0013] In some embodiments, the controller is further configured to: in the discharging phase, in response to one of the first battery pack and the second battery pack failing, controlling the other of the first battery pack and the second battery pack to discharge externally. The two battery packs can be redundant backups for each other, which can improve the continuity and reliability of battery power supply.

[0014] Embodiments of the second aspect of the application provide a battery control method applied to a battery management system for managing a power battery, the power battery including a first battery pack and a second battery pack connected through a bidirectional converter, and the battery control method includes:

[0015] obtaining a first state parameter of the first battery pack and a second state parameter of the second battery pack; the first state parameter and the second state parameter are respectively used to represent the health state of the corresponding battery pack; in response to a difference between the first state parameter and the second state parameter being greater than a first threshold value, setting the priority of the battery pack corresponding to the larger one of the first state parameter and the second state parameter in the charging phase and / or the priority of the battery pack in the discharging phase to be higher than that of the other battery pack.

[0016] The technical scheme of the embodiments of the present application evaluates the aging difference of the battery packs by comparing the state parameters of the two battery packs, and adjusts the priorities of charging and discharging of the battery packs according to the aging difference, which can coordinate and balance the aging degrees of the battery packs, prevent the aging difference from expanding, and help improve the overall service life of the battery, so as to more flexibly and reliably meet diversified power consumption demands.

[0017] 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 the first threshold, determining the priorities of the first battery pack and the second battery pack in the charging stage and / or the priorities of the first battery pack and the second battery pack in the discharging stage according to the rated capacity sizes of the battery packs. When the state parameters are similar, adjusting the priorities of charging and discharging according to the rated capacity sizes can better match the battery capacity and the power consumption demand, give full play to the respective advantages of the battery packs with different capacities as much as possible, and improve the overall performance of the battery.

[0018] In some embodiments, in response to the difference between the first state parameter and the second state parameter being less than or equal to the first threshold, determining the priorities of the first battery pack and the second battery pack in the charging stage and / or the priorities of the first battery pack and the second battery pack in the discharging stage according to the rated capacity sizes of the battery packs includes: 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 the priorities of the battery pack with a larger rated capacity in the charging stage and / or the priorities of the battery pack with a larger rated capacity in the discharging stage to be higher than those of the battery pack with a smaller rated capacity. Setting the charging priority or the discharging priority of the battery pack with a larger rated capacity to be higher can make the large-capacity battery reasonably bear the load, give full play to its capacity and cycle performance advantages, reduce the risk of transition cycles of the small-capacity battery pack, help realize synchronous attenuation of the two battery packs, and improve the overall performance of the battery.

[0019] In some embodiments, the battery control method further includes: in the discharging stage, in response to the difference between the first state parameter and the second state parameter being less than or equal to the first threshold, obtaining the state of charge of the first battery pack with a larger rated capacity; and in response to the state of charge of the first battery pack being greater than a second threshold, controlling the first battery pack to preferentially discharge to the outside until the state of charge of the first battery pack is less than or equal to the second threshold. The large-capacity battery not only has more storage capacity, but also has the advantages of strong cycle tolerance and stable output power. When the large-capacity battery has sufficient power, the large-capacity battery is preferentially used for power supply, which can reduce the switching frequency of the bidirectional converter, reduce the capacity conversion loss, and reduce the failure probability of the small-capacity battery.

[0020] In some embodiments, the battery control method further comprises, in the discharging phase, in response to the state of charge of the first battery pack being less than or equal to a second threshold value and the state of charge of the second battery pack being greater than a third threshold value, controlling the second battery pack to charge the first battery pack being discharged, or switching the second battery pack to discharge externally, wherein the third threshold value is greater than the second threshold value. By supplementing the first battery pack or switching the main power supply, the risk of over-discharging the first battery pack is reduced, the continuity of the battery external power supply is improved, the service life of the battery is prolonged, different power demands are flexibly met, and the energy utilization efficiency is improved.

[0021] In some embodiments, the power battery is applied to a vehicle; the battery control method further comprises, in the discharging 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 value, obtaining a driving state of the vehicle; the driving state comprises an intelligent driving mode, a commuting mode or a long-distance mode; in response to the vehicle being in the intelligent driving mode, keeping the state of charge of the second battery pack with lower rated capacity greater than or equal to a fourth threshold value; in response to the vehicle being in the 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 the second threshold value, and switching the second battery pack to discharge externally; and in response to the vehicle being in the long-distance mode, controlling the first battery pack and the second battery pack to discharge externally according to the ratio of the remaining charges of the first battery pack and the second battery pack. According to different driving states, the discharging mode of the battery pack is controlled, more diversified power demands are met, and the energy utilization efficiency of the battery is improved.

[0022] In some embodiments, the battery control method further comprises, in the charging phase, charging the first battery pack and the second battery pack according to the priority from high to low; in response to the charging power exceeding the demand power of the battery pack with higher priority among the first battery pack and the second battery pack, using the part of the charging power exceeding the demand power to charge the battery pack with lower priority among the first battery pack and the second battery pack. On the basis of determining the charging sequence based on the priority, the charging control logic is further optimized in combination with the relationship between the charging power and the demand power, and the charging efficiency of the battery is improved.

[0023] In some embodiments, the battery control method further comprises, in the discharging phase, in response to one of the first battery pack and the second battery pack failing, controlling the other of the first battery pack and the second battery pack to discharge externally. The two battery packs can be redundant backups for each other, which can improve the continuity and reliability of the battery power supply.

[0024] Embodiments of the third aspect of the present application provide a battery, comprising a power battery and a battery management system for managing the power battery, the power battery comprising a first battery pack and a second battery pack connected by a bidirectional converter, and the battery management system is the battery management system described above, or the battery management system is used to execute the battery control method described above.

[0025] Embodiments of the fourth aspect of the present application provide a vehicle, the vehicle comprising the battery as described above, the battery being configured to provide electrical energy.

[0026] Embodiments of the fifth aspect of the present application provide a computing device, comprising at least one processor; and at least one memory connected with the at least one processor, the at least one memory storing instructions which, when executed by the at least one processor alone or in combination, cause the computing device to perform the battery control method as described above.

[0027] Embodiments of the sixth aspect of the present application provide a computer-readable storage medium storing instructions which, when executed by one or more processors of a computing device alone or in combination, cause the computing device to perform the battery control method as described above.

[0028] Embodiments of the seventh aspect of the present application provide a computer program product comprising instructions which, when executed by one or more processors of a computing device alone or in combination, cause the computing device to perform the battery control method as described above.

[0029] The above description is merely a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the contents of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0030] In the drawings, like reference numerals refer to like elements throughout the various drawings. The drawings are not necessarily to scale, emphasis instead being placed on illustrating the principles of the application. It should be understood that the drawings are merely depictions of some embodiments in accordance with the disclosure and should not be construed as limiting the scope of the application.

[0031] Figure 1 Structure diagram of a vehicle of some embodiments of the present application; Figure 2 Exploded structure diagram of a battery of some embodiments of the present application; Figure 3 Structure diagram of a battery of some embodiments of the present application; Figure 4 Structure block diagram of a battery management system of some embodiments of the present application; Figure 5 Flowchart of a battery control method of some embodiments of the present application; Figure 6 Flowchart of a battery control method of some embodiments of the present application.

[0032] BRIEF DESCRIPTION OF DRAWINGS Vehicle 1000; Battery 100, control device 200, motor 300 Box 10, first part 11, second part 12, battery cell 20 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 DESCRIPTION

[0033] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0034] 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 belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0036] In this paper, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0038] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0039] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", etc. should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] At present, from the development of market situation, the application of rechargeable batteries is more and more extensive. Rechargeable batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in various electronic devices, such as electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of rechargeable batteries, the market demand is also increasing.

[0042] With the continuous development of technology, the power consumption scene of electric devices is constantly enriched, and the power consumption demand is more diversified. The battery device usually has one energy compartment, and the battery capacity of a single energy compartment is too large, which leads to a significant increase in cost, and the capacity is too small, which is difficult to meet the diversified power consumption demand, and once a single energy compartment fails, the electric device cannot work, and lacks redundancy design.

[0043] In order to meet the more diversified power consumption demand, the present application provides a power battery, which comprises a first battery pack and a second battery pack connected through a bidirectional converter. In this way, the two battery packs can be charged and discharged as independent energy compartments, can be discharged together, and one battery pack can be responsible for discharging, and the other battery pack can be used to supplement the energy of the battery pack.

[0044] For cost control, the chemical systems, the number of battery cells contained, etc. of the two battery packs can be designed differently, so that the voltage platforms of the two battery packs are different. After the two battery packs are connected through the bidirectional converter, they can realize common discharging or charging, or mutual charging, so as to balance the power supply capacity and the cost. However, the differential design of the two battery packs may put forward higher requirements and greater difficulty for the energy management of the power battery.

[0045] In order to balance the cycle performance of different battery packs and improve the service life of the battery, an embodiment of the present application provides a battery management system (BMS), which is used for managing a power battery. The power battery includes a first battery pack and a second battery pack connected through 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 for obtaining a first state parameter of the first battery pack, and the first state parameter is used for representing the health state of the first battery pack. The second detection circuit is used for obtaining a second state parameter of the second battery pack, and the second state parameter is used for representing the health state of the second battery pack. The controller is signal connected with the first detection circuit and the second detection circuit respectively. The controller is configured to set the priority of the battery pack corresponding to the larger one of the first state parameter and the second state parameter in the charging stage and / or the priority of the battery pack corresponding to the larger one of the first state parameter and the second state parameter in the discharging stage to be higher than the other battery pack, in response to the difference between the first state parameter and the second state parameter being greater than a first threshold value.

[0046] By comparing the state parameters of the two battery packs, the aging difference of the battery packs is evaluated, and the priorities of the charging and discharging of the battery packs are adjusted according to the aging difference. The aging degree of the battery packs can be coordinated and balanced, and the aging difference between the two battery packs is prevented from expanding, which is beneficial to improve the service life of the power battery as a whole, so as to more flexibly and reliably meet the diversified power demand.

[0047] The battery cell disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device or an energy storage device for a vehicle, a ship or an aircraft. The power supply system of the electric device or the energy storage device can be composed of the battery cell and the battery disclosed in the present application. In this way, the service life of the battery as a whole can be improved, so as to more flexibly and reliably meet the diversified power demand.

[0048] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0049] The following embodiments are described by taking a vehicle 1000 as an example.

[0050] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a control device 200 and a motor 300, and the control device 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0051] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0052] Please refer to Figure 2 , Figure 2 A structural schematic diagram of a battery is provided for some embodiments of the present application. The battery 100 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery monomer 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, and the first part 11 and the second part 12 are mutually covered. The first part 11 and the second part 12 jointly define a containing space for containing the battery monomer 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, which is covered on the open side of the second part 12 to jointly define the containing space with the second part 12. The first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0053] In the battery 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 20 is accommodated in the case 10. Of course, the battery 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the case 10. The battery 100 can also include other structures, for example, the battery 100 can also include a current combiner for realizing the electrical connection between the multiple battery cells 20.

[0054] Each battery cell 20 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0055] Please refer to Figure 3 and Figure 4 , Figure 3 the structural schematic diagram of the battery provided by some embodiments of the present application, Figure 4 the structural block diagram of the battery management system provided by some embodiments of the present application.

[0056] The 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, and the first battery pack 110 and the second battery pack 120 are connected through a bidirectional converter 130 and connected with a high-voltage power supply connection terminal 140 and a charging connection terminal 150.

[0057] The battery management system 160 is used for managing the battery pack, and the battery pack includes the first battery pack 110 and the second battery pack 120 connected through the bidirectional converter 130.

[0058] 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 for acquiring a first state parameter of the first battery pack 110, the first state parameter is used for characterizing a health state of the first battery pack 110; the second detection circuit 1602 is used for acquiring a second state parameter of the second battery pack 120, the second state parameter is used for characterizing a health state of the second battery pack 120; the controller 1603 is signal connected with the first detection circuit 1601 and the second detection circuit 1602 respectively, and the controller 1603 is configured to determine a priority in a charging stage and / or a priority in a discharging stage of the first battery pack 110 and the second battery pack 120 based on the first state parameter and the second state parameter.

[0059] The first battery pack 110 and the second battery pack 120 can be two relatively independent battery packs, and any one of the battery packs can include a plurality of battery monomers or a plurality of battery modules.

[0060] The first battery pack 110 and the second battery pack 120 can be two relatively independent energy cabins in the battery 100. For example, the box 10 of the battery 100 can form two relatively independent accommodating cavities for accommodating the first battery pack 110 and the second battery pack 120, respectively.

[0061] The rated capacities of the first battery pack 110 and the second battery pack 120 can be the same or different, and the electrode materials of the two battery packs can be the same or different. In some embodiments, the first battery pack 110 and the second battery pack 120 themselves have different capacities, so that one or both of the battery packs can be controlled to provide electric energy according to different power consumption requirements, which not only can meet diversified power consumption requirements, but also can serve as standby power supply for each other, and can be used to supplement power for the other battery pack or partially or completely replace the other battery pack to supply power externally.

[0062] It can be understood that the power battery can also include three or more battery packs, and any two of the battery packs can be the first battery pack 110 and the second battery pack 120 of the embodiments of the present application.

[0063] The bidirectional converter 130 can be a bidirectional direct current-direct current converter (bidirectional DCDC), and its core function is to enable bidirectional flow of electric current between two battery packs with different voltages or states, thereby achieving more flexible battery charging and discharging control.

[0064] The high-voltage power supply connection terminal 140 is used to be connected with a load to provide electric energy to the load. The load can be a driving motor of a vehicle, a thermal management system, and other high-voltage loads. The charging connection terminal 150 is used to be connected with an external charging device to receive electric energy provided by the external charging device.

[0065] The first detection circuit 1601 and the second detection circuit 1602 can be two battery data sampling units, and are mainly used for real-time sampling of parameters of the battery packs. In some embodiments, the first detection circuit 1601 and the second detection circuit 1602 can be used to collect temperature, voltage, current, and other parameters of the corresponding battery packs. For example, the first detection circuit 1601 and the second detection circuit 1602 can be cell module controllers (CMC).

[0066] The first state parameter and the second state parameter can be any parameter capable of representing the state of health of the battery pack, such as voltage, voltage response speed, equalization current, equalization interval time, internal resistance, etc., which can reflect the degree of capacity attenuation and internal resistance increase of the battery cell. Exemplarily, the first state parameter and the second state parameter can be the state of health (SOH) of the battery.

[0067] The SOH of the battery pack is a key indicator for measuring the degree of attenuation of the current performance of the battery pack relative to the brand-new state, and is usually expressed as a percentage, with 100% representing the brand-new state and 0% representing complete failure.

[0068] The SOH of the battery pack can be calculated according to the ratio of the actual available capacity of the current battery pack to the rated capacity (or design capacity) at the time of factory shipment, and the formula is: SOH = (current actual capacity / rated capacity) x 100%. For example, the rated capacity of a brand-new battery pack is 100 Ah, and after a period of use, the actual capacity of the battery pack is detected to be only 80 Ah, and the SOH thereof is 80%.

[0069] The controller 1603 can be a battery management unit (BMU), and the controller 1603 is signal-connected with the first detection circuit 1601 and the second detection circuit 1602, for receiving the collected data of the first detection circuit 1601 and the second detection circuit 1602, processing the data, and outputting a control instruction for indicating the charging or discharging of the battery pack.

[0070] The priority of the charging phase refers to the charging demand of the battery pack being met in order from high to low priority under the same conditions. Similarly, the priority of the discharging phase refers to the battery pack with high priority being discharged first under the same conditions. In this way, by adjusting the priority of the charging phase and the discharging phase of the battery pack, the number of times of participating in the charging and discharging cycle of the battery pack can be adjusted, and the difference in the state of health, or the difference in the cycle life, between different battery packs can be balanced, so that the degree of aging of the two is kept within a certain range, and the overall life of the battery is improved.

[0071] Exemplarily, the priority of the charging phase or the priority of the discharging phase of the battery pack can be set or adjusted in the software system, i.e., the corresponding priority identifier is set in the software system, and the controller 1603 will control the charging or discharging sequence of the corresponding battery pack according to the corresponding priority identifier when actually charging or discharging. In some other examples, the controller 1603 can also determine the object preferred for charging or discharging in advance according to the size of the first state parameter and the second state parameter each time the charging or discharging needs to be performed, and directly output the corresponding control instruction, without the need to set the corresponding identifier in the software system.

[0072] By comparing the state parameters of the two battery packs, the aging difference of the battery packs is evaluated, and the priority of charging and discharging of the battery packs is adjusted according to the aging difference, which can coordinate and balance the aging degree of the battery packs, prevent the aging difference from expanding, and help improve the overall service life of the battery, thereby more flexibly and reliably meeting diversified power consumption demands.

[0073] According to some embodiments of the present 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 one of the first state parameter and the second state parameter in the charging stage and / or the priority in the discharging stage to be higher than the other battery pack.

[0074] The first threshold can be determined according to the capacity attenuation characteristics, power consumption demand, BMS detection accuracy, and other factors of the first battery pack 110 and the second battery pack 120.

[0075] If the first threshold is set too small, the detection accuracy error of the detection circuit may cause false adjustment, or the charging and discharging priorities of the battery packs may be adjusted frequently, causing repeated switching of the charging and discharging priorities and causing system voltage and current fluctuations. If the first threshold is set too large, the charging and discharging priorities of the two battery packs may not be adjusted in time, which may increase the risk of overcharging or overdischarging of the battery pack with a lower state parameter, and the overall performance of the battery is dragged down by the battery pack with a lower state parameter.

[0076] In some embodiments, the first threshold can be in the range of 5%-15%, for example, it can be 5%, 8%, 10%, 12%, 15%, or a value between any two of the above values.

[0077] In some embodiments, the first threshold can be a fixed value set in advance, or a threshold value dynamically adjusted according to the detection results of the BMS. For example, the first threshold can be further adjusted dynamically according to the EIS detection results of the battery packs to determine whether the first threshold is appropriate and to keep the aging difference between the first battery pack 110 and the second battery pack 120 within an acceptable range.

[0078] In the present embodiment, the adjustment of the charging and discharging priorities is triggered when the difference between the state parameters exceeds the first threshold, which can better control the aging difference between the two battery packs and thus improve the overall performance of the battery.

[0079] According to some embodiments of the present 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 the first threshold, determine the priority of the first battery pack and the second battery pack in the charging stage and / or the priority in the discharging stage according to the rated capacity of the battery packs.

[0080] The rated capacity of the battery pack refers to the minimum available electric quantity that can be released after the battery pack is fully charged under the specified charging and discharging conditions, including the charging and discharging rate, temperature, cutoff voltage, etc., and the unit is usually ampere-hour (Ah) or milliampere-hour (mAh).

[0081] The rated capacities of the first battery pack 110 and the second battery pack 120 are different. In some examples, the electrode assemblies of the battery cells in the first battery pack 110 and the second battery pack 120 can adopt different chemical systems, for example, can be lithium iron phosphate system and ternary system respectively, and the difference in such chemical systems can cause the rated capacities of the battery packs to be different. In other examples, the first battery pack 110 and the second battery pack 120 can also respectively include different numbers of battery cells or battery modules, which can also make the rated capacities of the two different. Selecting battery packs with different rated capacities can flexibly select a suitable power supply according to the power demand, thereby meeting diversified power demand.

[0082] Specifically, how to determine the priority of the charging phase and the priority of the discharging phase according to the rated capacity can be set according to the actual scene and needs. For example, in order to make the battery packs with different rated capacities reach the full charge state at the same time during charging or reach the discharge cutoff voltage at the same time during discharging, the priority of the charging phase and the priority of the discharging phase of the battery pack with a larger rated capacity can be set to be higher, so that the battery packs with different capacities can be filled at the same time or emptied at the same time. In another example, when the battery is in a low power warning mode, in order to prevent the battery pack with a smaller rated capacity from reaching the discharge cutoff threshold first, the priority of the charging phase of the battery pack with a smaller rated capacity can also be set to be higher, so that the terminal voltage of the battery pack with a smaller rated capacity can be quickly raised, which is beneficial to guarantee the continuous operation capability of the battery. It can be understood that the priority of the charging phase and the priority of the discharging phase can be set synchronously or independently, and the present application does not limit this.

[0083] When the state parameters are similar, adjusting the charging and discharging priority according to the rated capacity size can better match the battery capacity and the power demand, maximize the advantages of battery packs with different capacities, and improve the overall performance of the battery.

[0084] According to some embodiments of the present 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, setting the priority of the charging phase and / or the priority of the discharging phase of the battery pack with a larger rated capacity among the first battery pack and the second battery pack to be higher than that of the battery pack with a smaller rated capacity.

[0085] The larger the rated capacity of the battery pack, the more power it stores. Under the same power demand, the discharge depth of the high-capacity battery pack is lower, the aging speed is slower, and the charging and discharging efficiency is higher, which can better meet the demand for larger power and longer time. Therefore, in the case that the aging degrees of the two battery packs are close, the charging or discharging priority can be set according to the rated power of the battery pack.

[0086] In the charging phase, the charging connection terminal 150 is connected with the charging pile, and 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, converts the power provided by the external charging pile into a voltage / current suitable for the high-priority battery pack, so as to realize charging of the high-priority battery pack first; when the high-priority battery pack is close to full, for example, the state of charge reaches 95%, the BMS controls the bidirectional converter 130 to switch to the "low-priority battery pack charging mode", and the external power is switched to the low-priority battery pack for charging. The state of charge and voltage are also monitored until the state of charge reaches 95%.

[0087] In the discharging phase, the high-voltage power supply connection terminal 140 is connected with the load, and the battery management system 160 controls the bidirectional converter 130 to switch to the "high-priority battery pack discharging mode" according to the set priority, so that the high-priority battery pack directly supplies power to the external load (such as a vehicle-mounted motor or an energy storage load), while the discharging current and cutoff voltage are monitored. If the output power of the high-priority battery pack can fully meet the load demand, only the high-priority battery is used for power supply; if the load power exceeds the maximum output power of the high-priority battery, the battery management system 160 controls the bidirectional converter 130 to switch to the "double-battery pack cooperative discharging mode", so that the low-priority battery pack is connected in parallel with the output of the high-priority battery pack after voltage conversion by the bidirectional converter 130, and supplies power to the load together. By setting a higher charging priority or discharging priority for the battery pack with a larger rated capacity, the large-capacity battery can reasonably bear the load, play its capacity and cycle performance advantages, reduce the risk of over-cycling of the small-capacity battery pack, and help to realize synchronous attenuation of the two battery packs, thereby improving the overall performance of the battery.

[0088] According to some embodiments of the present application, the controller is further configured to: in the discharging 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 value, obtaining the state of charge of the first battery pack with a larger rated capacity; and in response to the state of charge of the first battery pack being greater than a second threshold value, controlling the first battery pack to discharge preferentially to the outside until the state of charge of the first battery pack is less than or equal to the second threshold value.

[0089] 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.

[0090] 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%.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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 is the total input capacity during the charging process.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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: S410: Obtain the first state parameters of the first battery pack 110 and the second state parameters of the second battery pack 120; 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.

[0116] 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).

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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: 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. 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] According to some embodiments of this application, the battery control method 400 further includes: 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] The battery control method 400 also 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 the first threshold, the driving state of vehicle 1000 is obtained; the driving state includes intelligent driving mode, commuting mode or long-distance mode. 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. 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 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.

[0146] 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.

[0147] 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.

[0148] According to some embodiments of this application, the battery control method 400 further includes: 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. 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] According to some embodiments of this application, the battery control method 400 further includes: 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.

[0153] 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.

[0154] 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.

[0155] In some embodiments, the rated capacity of the first battery pack 110 is greater than the rated capacity of the second battery pack 120.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] The technical solution of this application will be further described below with reference to a specific embodiment.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] likeFigure 6 As shown, the specific control flow of the battery management system 160 is as follows: Step S501: Begin.

[0169] Step S502: Obtain the SOH of the first battery pack 110 and the SOH of the second battery pack 120.

[0170] 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.

[0171] Step S504: Obtain the rated capacity of the first battery pack and the rated capacity of the second battery pack.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] Step S508, End.

[0176] 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, which 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 The controller is signal-connected to the first detection circuit and the second detection circuit respectively. The controller 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 discharge phase to be higher than that of the other battery pack.

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 power battery is used in the vehicle; 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, commuting mode, or long-distance 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. 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, and then the second battery pack is switched to discharge externally. as well as In response to the vehicle being in the 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.

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 includes a first battery pack and a second battery pack connected via a bidirectional converter, and 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 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.

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 power battery is used in the vehicle; 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, commuting mode, or long-distance 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 the fourth threshold. 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 switches to discharging externally; and In response to the vehicle being in the 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.

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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