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

Abstract

The embodiment of the invention provides a battery energy management method, a battery system, a power utilization device and a battery management system. A plurality of batteries can be fully discharged at the same time. The method is applied to a battery system comprising a first battery and a second battery, the first battery and the second battery are arranged in two energy regions of the battery system, and the method comprises the steps that a first state parameter and a second state parameter are obtained, the first state parameter comprises the voltage and / or SOC of the first battery, and the second state parameter comprises the voltage and / or SOC of the second battery; controlling energy transfer between the first battery and the second battery according to the first state parameter and the second state parameter; when the first battery transfers energy to the second battery, if the first state parameter reaches the lower limit of the first state parameter, controlling the first battery to stop transferring energy; and when the second battery transfers energy to the first battery, if the second state parameter reaches the second state parameter lower limit, controlling the second battery to stop transferring energy.

Description

Technical Field

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

[0002] Electric vehicles, as a type of new energy vehicle, have received widespread attention since their introduction. Battery technology is a crucial factor in the development of electric vehicles.

[0003] Therefore, improving battery performance is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a battery energy management method, a battery system, an electrical device, and a battery management system, which can achieve the goal of simultaneously fully discharging multiple batteries.

[0005] A first aspect provides a battery energy management method, applied to a battery system including a first battery and a second battery, the battery system including independently configured energy zones, the first battery and the second battery respectively disposed in two energy zones within the energy zones, the method comprising: acquiring a first state parameter and a second state parameter, the first state parameter including the voltage of the first battery and / or the state of charge (SOC) of the first battery, the second state parameter including the voltage of the second battery and / or the SOC of the second battery; controlling energy transfer between the first battery and the second battery based on the first state parameter and the second state parameter until the difference between the first state parameter and the second state parameter is within a preset range; when energy transfer occurs from the first battery to the second battery, if the first state parameter reaches a first state parameter lower limit, controlling the first battery to stop transferring energy to the second battery; when energy transfer occurs from the second battery to the first battery, if the second state parameter reaches a second state parameter lower limit, controlling the second battery to stop transferring energy to the first battery.

[0006] In this embodiment, when two batteries are positioned in different energy zones, energy transfer between the two batteries is controlled based on their state parameters until the difference between their state parameters is within a preset range. This ensures that when the first and second batteries are discharged, both batteries can reach full discharge simultaneously, reducing the likelihood of one battery over-discharged. Furthermore, energy transfer between the first and second batteries fully utilizes the energy of both batteries, improving energy efficiency. Additionally, during energy transfer, if the state parameter of the battery with the higher state parameter reaches its lower limit, energy transfer stops, reducing the probability of the battery with the higher state parameter reaching undervoltage or other states, allowing it to continue operating normally.

[0007] Furthermore, the first and second batteries are respectively located in different energy zones, which is a redundant design for the battery system. In this way, if one battery malfunctions during the use of the electrical device, the other battery can continue to supply power to the electrical device, allowing the electrical device to continue to work normally.

[0008] In some possible implementations, obtaining the first state parameter and the second state parameter includes: obtaining the first state parameter and the second state parameter during the discharge process of the first battery and the second battery; controlling the energy transfer between the first battery and the second battery based on the first state parameter and the second state parameter includes: during the discharge process of the first battery and the second battery, controlling the second battery to transfer energy to the first battery when the first state parameter is less than or equal to a first threshold; or controlling the first battery to transfer energy to the second battery when the second state parameter is less than or equal to a second threshold.

[0009] This technical solution acquires first and second state parameters during the discharge process of the first and second batteries, and performs energy transfer based on the first and second state parameters, which can improve the accuracy of energy transfer and further increase the possibility of both batteries achieving full discharge simultaneously.

[0010] In some possible implementations, obtaining the first state parameter and the second state parameter includes: obtaining the first state parameter and the second state parameter before the first battery and the second battery discharge; controlling the energy transfer between the first battery and the second battery based on the first state parameter and the second state parameter includes: controlling the second battery to transfer energy to the first battery when the first state parameter is less than the second state parameter before the first battery and the second battery discharge; or controlling the first battery to transfer energy to the second battery when the second state parameter is less than the first state parameter.

[0011] This technical solution acquires the state parameters of the two batteries before discharge and controls the energy transfer from the battery with the higher state parameter to the battery with the lower state parameter based on the difference between the two state parameters before discharge. In this way, the energy transfer process does not affect the discharge process of the two batteries, thereby improving the discharge efficiency of the first and second batteries.

[0012] In some possible implementations, the lower limit of the first state parameter is determined based on at least one of the properties of the first battery, temperature, and discharge rate; and / or the lower limit of the second state parameter is determined based on at least one of the properties of the second battery, temperature, and discharge rate.

[0013] This technical solution determines a first state parameter based on at least one of the properties, temperature, and discharge rate of the first battery, and / or determines a second state parameter based on at least one of the properties, temperature, and discharge rate of the first battery, so that the determined lower limits of the first and second state parameters are relatively accurate, thereby reducing the possibility of over-discharge of the first or second battery.

[0014] In some possible implementations, the first battery and the second battery are connected in series via a voltage converter; controlling the energy transfer between the first battery and the second battery includes controlling the first battery and the second battery to transfer energy via the voltage converter.

[0015] In this technical solution, the first battery and the second battery are connected through a voltage converter, and energy is transferred between them through the voltage converter. This is not only easy to implement, but also allows the battery system to meet different voltage requirements, thereby improving the applicability of the battery system.

[0016] In some possible implementations, both the first battery and the second battery are power batteries, or both the first battery and the second battery are energy batteries.

[0017] This technical solution sets both the first battery and the second battery as energy-type batteries or power-type batteries. In this way, the first battery and the second battery are of the same type and have the same discharge rate, which can reduce the number of energy transfers during the discharge process and thus improve the discharge efficiency.

[0018] In some possible implementations, the first battery is a power battery and the second battery is an energy battery; or the first battery is an energy battery and the second battery is a power battery.

[0019] This technical solution sets the first battery and the second battery as different types of batteries, enabling the battery system to meet different usage scenarios and thus allowing the battery system to perform under more operating conditions.

[0020] Secondly, a battery system is provided, including a first battery and a second battery, which are respectively disposed in two energy zones. The battery system includes: a processing unit, configured to acquire a first state parameter and a second state parameter, the first state parameter including the voltage of the first battery and / or the state of charge (SOC) of the first battery, and the second state parameter including the voltage of the second battery and / or the SOC of the second battery; and a control unit, configured to control energy transfer between the first battery and the second battery according to the first state parameter and the second state parameter, until the difference between the first state parameter and the second state parameter is within a preset range; the control unit is further configured to, when the first battery is transferring energy to the second battery, if the first state parameter reaches a lower limit of a first state parameter, control the first battery to stop transferring energy to the second battery, and when the second battery is transferring energy to the first battery, if the second state parameter reaches a lower limit of a second state parameter, control the second battery to stop transferring energy to the first battery.

[0021] Thirdly, an electrical device is provided, comprising: a first load; a second load; and a battery system as described in the second aspect above, wherein the battery system is connected to the first load and is used to provide a first direct current to the first load, and / or, the battery system is connected to the second load and is used to provide a second direct current to the second load, wherein the voltage of the first direct current is greater than a voltage threshold and the voltage of the second direct current is less than a voltage threshold.

[0022] Fourthly, a battery management system is provided, including a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to invoke the computer program to execute the methods in the first aspect or its various implementations described above.

[0023] Fifthly, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the methods described in the first aspect or its various implementations.

[0024] Sixthly, a computer program product is provided, comprising: computer program instructions, which, when executed by a computer, cause the computer to perform the method described in the first aspect or its various implementations. Attached Figure Description

[0025] Figure 1 A schematic diagram of a battery comprising two energy zones is shown, according to an embodiment of this application.

[0026] Figure 2 A schematic flowchart of a battery energy management method according to an embodiment of this application is shown.

[0027] Figure 3 A schematic flowchart of another battery energy management method according to an embodiment of this application is shown.

[0028] Figure 4 A schematic diagram illustrating energy transfer between a first battery and a second battery via bidirectional DC / DC converter, according to an embodiment of this application, is shown.

[0029] Figure 5 A schematic block diagram of a battery system according to an embodiment of this application is shown.

[0030] Figure 6 A schematic block diagram of another battery management system according to an embodiment of this application is shown.

[0031] Figure 7 A schematic diagram of an electrical device according to an embodiment of this application is shown. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0034] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0036] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0037] In the field of new energy, batteries, as the primary power source for electrical devices such as vehicles, ships, or spacecraft, are undeniably crucial. To further improve battery performance and safety, multiple independently operating energy zones can be configured, for example... Figure 1 As shown, two independent energy zones can be set up, thereby enabling multiple redundancy designs and energy management, such as high-voltage flexible power supply, low-voltage flexible power supply, thermal management redundancy, and thermal runaway isolation.

[0038] Setting up independent energy zones ensures stable power output and reduces the likelihood of electrical devices being affected by power failures. This allows another zone to maintain power supply even in the event of a single zone failure, ensuring the continued normal operation of the devices. Furthermore, independent energy zones allow for more flexible battery system design, catering to diverse usage scenarios. For example, independent energy zones can be paired with battery cells exhibiting different temperature performance characteristics and each zone can have its own independent temperature control. This allows the battery system to adapt to both extremely cold and high-temperature environments, enabling it to perform at its best under a wider range of conditions.

[0039] At this point, a multi-energy-zone (multi-battery-pack) battery system requires all batteries to reach full discharge simultaneously during the discharge process. If multiple batteries do not reach full discharge simultaneously, a situation may occur where "charge cannot be discharged," or the batteries may be over-discharged, affecting battery performance.

[0040] In view of this, embodiments of this application provide a battery energy management method. This method is applied to a battery system including a first battery and a second battery. The battery system includes independently configured energy zones, with the first battery and the second battery respectively disposed in two energy zones within the energy zones. The method includes: acquiring a first state parameter and a second state parameter, the first state parameter including the voltage of the first battery and / or the state of charge (SOC) of the first battery, and the second state parameter including the voltage of the second battery and / or the SOC of the second battery; then, controlling energy transfer between the first battery and the second battery based on the first state parameter and the second state parameter until the difference between the first state parameter and the second state parameter is within a preset range.

[0041] This technical solution, when the two batteries are positioned in different energy zones, controls energy transfer between them based on their state parameters until the difference between their state parameters is within a preset range. This ensures that when both batteries are discharged, they can reach full discharge simultaneously, reducing the likelihood of one battery over-discharged. Furthermore, the energy transfer between the two batteries fully utilizes their energy, improving energy efficiency.

[0042] Furthermore, the first and second batteries are respectively located in different energy zones, which is a redundant design for the battery system. In this way, if one battery malfunctions during the use of the electrical device, the other battery can continue to supply power to the electrical device, allowing the electrical device to continue to work normally.

[0043] The technical solutions described in the embodiments of this application are applicable to various battery-powered devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0044] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0045] Regarding the type of battery, the embodiments of this application can use any type of battery, including but not limited to: lithium-ion batteries, lithium metal batteries, lithium-sulfur batteries, lead-acid batteries, nickel-metal hydride batteries, lithium-air batteries, sodium batteries, etc. For example, lithium-ion batteries can be ternary lithium batteries, lithium iron phosphate batteries, etc. Regarding the size of the battery, the battery in the embodiments of this application can be a battery module or a battery pack, etc. In the embodiments of this application, the specific type and size of the battery are not specifically limited.

[0046] Figure 2 A schematic flowchart of a battery energy management method 200 according to an embodiment of this application is shown. Method 200 can be applied to a battery system including a first battery and a second battery, the battery system including independently configured energy zones, with the first battery and the second battery respectively disposed in two energy zones within the energy zones.

[0047] Method 200 may include at least some of the following.

[0048] S210: Obtain the first state parameter and the second state parameter.

[0049] S220: Based on the first state parameter and the second state parameter, control the energy transfer between the first battery and the second battery until the difference between the first state parameter and the second state parameter is within a preset range.

[0050] Figure 3 A schematic flowchart of another battery energy management method 300 according to an embodiment of this application is shown. Method 300 can also be applied to a battery system including a first battery and a second battery, the battery system including independently configured energy zones, with the first battery and the second battery respectively disposed in two energy zones.

[0051] Method 300 may include at least some of the following.

[0052] S310: Obtain the first state parameter and the second state parameter.

[0053] S320: Based on the first state parameter and the second state parameter, control the energy transfer between the first battery and the second battery until the difference between the first state parameter and the second state parameter is within a preset range.

[0054] S330: When the first battery is transferring energy to the second battery, if the first state parameter reaches the lower limit of the first state parameter, control the first battery to stop transferring energy to the second battery; when the second battery is transferring energy to the first battery, if the second state parameter reaches the lower limit of the second state parameter, control the second battery to stop transferring energy to the first battery.

[0055] The first state parameter includes the voltage in the first battery and / or the state of charge (SOC) of the first battery, and the second state parameter may include the voltage in the second battery and / or the state of charge (SOC) of the second battery.

[0056] In this embodiment, when two batteries are positioned in different energy zones, energy transfer between the two batteries is controlled based on their state parameters until the difference between their state parameters is within a preset range. This ensures that when the first and second batteries are discharged, both batteries can reach full discharge simultaneously, reducing the likelihood of one battery over-discharged. Furthermore, the energy transfer between the first and second batteries fully utilizes their energy, improving energy efficiency.

[0057] Furthermore, the first and second batteries are respectively located in different energy zones, which is a redundant design for the battery system. In this way, if one battery malfunctions during the use of the electrical device, the other battery can continue to supply power to the electrical device, allowing the electrical device to continue to work normally.

[0058] Furthermore, during the energy transfer process, if the state parameters of a battery with high state parameters reach the lower limit, the energy transfer will stop. This reduces the probability of the battery with high state parameters reaching undervoltage or other states, allowing the battery with high state parameters to continue to operate normally.

[0059] Specifically, the battery system can consist of a battery and a battery management system. The battery system includes a first battery and a second battery, which can be a battery pack, a battery module, or a battery assembly formed by electrically connecting individual battery cells.

[0060] An energy zone is a portion of a battery system that can operate and be controlled independently. For example, each energy zone can be charged and discharged independently. The energy zones can be divided according to the battery configuration within the system. Optionally, when the battery system includes one or more battery packs, energy zones can be divided within each battery pack. The first and second batteries can be located in different energy zones within each battery pack, and separator beams can be used to isolate the energy zones. Alternatively, when the battery system includes multiple battery packs, each battery pack can be considered a separate energy zone, forming multiple energy zones across the battery packs.

[0061] It should be understood that the first battery in the embodiments of this application may also be referred to as the first battery pack, and the second battery may also be referred to as the second battery pack.

[0062] The voltage of the first battery can be the lowest or average voltage among the multiple battery cells in the first battery, and the voltage of the second battery can be the lowest or average voltage among the multiple battery cells in the second battery.

[0063] It should be noted that if the voltage of the first battery is the lowest voltage among the multiple battery cells in the first battery, then the voltage of the second battery is also the lowest voltage among the multiple battery cells in the second battery.

[0064] Besides voltage and SOC, the first state parameter can also include other parameters, such as the temperature of the first battery and its state of health (SOH). Similarly, the second state parameter can also include other parameters, such as the temperature of the second battery and its SOH. The temperature of the first battery can be the lowest temperature, the highest temperature, or the average temperature of the multiple cells in the first battery. The temperature of the second battery can be the lowest temperature, the highest temperature, or the average temperature of the multiple cells in the second battery.

[0065] The first and second batteries can be connected in series. Optionally, the first and second batteries can be connected via a voltage converter. In this case, S220 may specifically include controlling the first and second batteries to transfer energy via the voltage converter.

[0066] A voltage converter can be a device or circuit used to achieve power input-output conversion, such as a DC / DC converter or a flyback converter.

[0067] A DC / DC converter can be a unidirectional DC / DC converter. For example, a first battery and a second battery can be connected using two unidirectional DC / DC converters, one of which is used to transfer energy from the first battery to the second battery, and the other is used to transfer energy from the second battery to the first battery.

[0068] A DC / DC converter can also be a bidirectional DC / DC converter. For example... Figure 4 As shown, the first battery and the second battery can be connected via a bidirectional DC / DC converter, and there can be one such bidirectional DC / DC converter. In this case, energy transfer between the first battery and the second battery through this bidirectional DC / DC converter can be controlled.

[0069] The first and second batteries are connected via a bidirectional DC / DC converter, and energy transfer between them is achieved through this converter. This is not only easy to implement, but also requires only one DC / DC converter, reducing the space occupied by the converter and lowering costs.

[0070] Alternatively, the first and second batteries can be connected in parallel.

[0071] This application does not specifically limit the types of the first battery and the second battery. The types of the first battery and the second battery may be the same or different. The battery types of the individual cells inside the first battery may be the same or different, and the battery types of the individual cells inside the second battery may be the same or different.

[0072] In some embodiments, the type of the first battery may be different from that of the second battery, as long as the output of the first battery and the second battery meet the system requirements.

[0073] For example, the first battery can be a power battery, and the second battery can be an energy battery. Alternatively, the first battery can be an energy battery, and the second battery can be a power battery.

[0074] This technical solution sets the first battery and the second battery as different types of batteries, enabling the battery system to meet different usage scenarios and thus allowing the battery system to perform under more operating conditions.

[0075] Among them, power batteries can provide power output to meet the demand for large amounts of energy in a short period of time, and can be used in the electric drive system of electrical devices, such as for acceleration and hill climbing. Energy batteries can store as much energy as possible and are suitable for electrical devices that require longer driving range.

[0076] Alternatively, the types of the first and second batteries can be set to be the same.

[0077] In some embodiments, both the first battery and the second battery can be energy-type batteries, or both can be power-type batteries. This technical solution sets both the first battery and the second battery as either energy-type or power-type batteries, thus ensuring they are of the same type and have the same discharge rate. This reduces the number of energy transfers during discharge, thereby improving discharge efficiency.

[0078] Optionally, the preset range can be determined specifically according to the actual situation. For example, the preset range can be determined based on the application scenarios of the first and second batteries, or it can be determined based on the attribute parameters of the first and second batteries.

[0079] In some embodiments, the preset range may be determined based on at least one of the following parameters: the capacity of the first battery, the capacity of the second battery, the number of battery cells included in the first battery, the number of battery cells included in the second battery, and the DC / DC transfer efficiency.

[0080] For example, if the first and second state parameters include voltage, the preset range can be 0 volts (V) to 5V. For example, the preset range is 1V to 4V, 0V to 3V, 0V to 2V, etc. If the first and second state parameters include SOC, the preset range can be 0% to 5%. For example, the preset range is 0% to 4%, 0% to 3%, or 0% to 2%, etc.

[0081] In some embodiments, a first state parameter and a second state parameter can be acquired during the discharge process of the first battery and the second battery. In this case, if the first state parameter is less than or equal to a first threshold, energy can be transferred from the second battery to the first battery; or, if the second state parameter is less than or equal to a second threshold, energy can be transferred from the first battery to the second battery.

[0082] This technical solution acquires first and second state parameters during the discharge process of the first and second batteries, and performs energy transfer based on the first and second state parameters, which can improve the accuracy of energy transfer and further increase the possibility of both batteries achieving full discharge simultaneously.

[0083] During the discharge process of the first battery and the second discharge, the first state parameter and the second state parameter can be acquired in real time. Alternatively, the first state parameter and the second state parameter can be acquired once at preset time intervals, such as 10ms, 1s, 5s, 10s, etc. Or, the first state parameter and the second state parameter can be acquired randomly; for example, the first state parameter and the second state parameter can be acquired once at the 10th second of discharge, then once at the 15th second of discharge, and then once at the 30th second of discharge.

[0084] The first threshold can be determined by the user based on experience, or it can be determined based on multiple parameters, such as the battery's own capacity, the battery's temperature, the ambient temperature, and the driving mode of the electrical device. The driving mode may include, for example, sport mode or comfort mode. Optionally, the first threshold can be the battery's undervoltage threshold.

[0085] Similarly, the second threshold can be determined based on empirical values, or it can be determined based on multiple parameters, such as the second battery's own capabilities (e.g., power capacity), the second battery's temperature, the ambient temperature, and the driving mode of the electrical device. The driving mode may include, for example, sport mode, comfort mode, etc. Optionally, the second threshold can be the second battery's undervoltage threshold.

[0086] The first threshold can be the same as or different from the second threshold; this application does not specifically limit this.

[0087] It should be noted that during the discharge process, energy transfer can be performed multiple times based on the first state parameters and the second state.

[0088] In other embodiments, a first state parameter and a second state parameter can be obtained before discharge, and then, if the first state parameter is less than the second state parameter, the second battery can be controlled to transfer energy to the first battery, or if the second state parameter is less than the first state parameter, the first battery can be controlled to transfer energy to the second battery.

[0089] This technical solution acquires the state parameters of the two batteries before discharge and controls the energy transfer from the battery with the higher state parameter to the battery with the lower state parameter based on the difference between the two state parameters before discharge. In this way, the energy transfer process does not affect the discharge process of the two batteries, thereby improving the discharge efficiency of the first and second batteries.

[0090] Before discharge, energy is transferred between the first and second batteries so that the difference between the first and second state parameters is within a preset range. In this way, during the discharge process, the voltage drop rate of the first battery and the voltage drop rate of the second battery are similar, thereby achieving the goal of simultaneously fully discharging the first and second batteries.

[0091] After energy transfer is performed before discharge, the first state parameter and the second state parameter can continue to be acquired during the discharge process, and energy transfer can be performed based on the first state parameter and the second state parameter during the discharge process.

[0092] In other embodiments, before discharge, it can be determined which of the first and second batteries will be fully discharged in advance based on the first and second state parameters. After the first and second batteries have discharged for a certain period of time, the battery that is fully discharged in advance can be controlled to transfer energy to the other battery.

[0093] During energy transfer, if the first battery transfers energy to the second battery, it can continue transferring energy to the second battery until the difference between the first and second state parameters is within a preset range, all the way up until the first state parameter reaches its lower limit. Similarly, during energy transfer, if the second battery transfers energy to the first battery, it can continue transferring energy to the first battery until the difference between the first and second state parameters is within a preset range, all the way up until the second state parameter reaches its lower limit.

[0094] The lower limit of the first state parameter can be the undervoltage threshold of the first battery, and the lower limit of the second state parameter can be the undervoltage threshold of the second battery.

[0095] The lower limit of the first state parameter and the lower limit of the second state parameter can be fixed. That is, for the first battery, the lower limit of the first state parameter is the same at any time and in any scenario. Or, for the second battery, the lower limit of the second state parameter is the same at any time and in any scenario.

[0096] Of course, the lower bounds of the first and second state parameters can change as other parameters change.

[0097] In some embodiments, the lower limit of the first state parameter may be determined based on at least one of the properties of the first battery, temperature, and discharge rate. For example, the higher the discharge rate of the first battery, the lower limit of the first state parameter will be.

[0098] The lower limit of the second state parameter can also be determined based on at least one of the properties of the first battery, temperature, and discharge rate.

[0099] This technical solution determines a first state parameter based on at least one of the properties, temperature, and discharge rate of the first battery, and / or determines a second state parameter based on at least one of the properties, temperature, and discharge rate of the first battery, so that the determined lower limits of the first and second state parameters are relatively accurate, thereby reducing the possibility of over-discharge of the first or second battery.

[0100] When energy is transferred from the first battery to the second battery, if the first state parameter has reached its lower limit, but the difference between the first state parameter and the second state parameter is still greater than a preset range, the discharge of the first battery and the second battery can be stopped. Alternatively, energy can be replenished to the second battery through other devices until the difference between the first state parameter and the second state parameter is within the preset range.

[0101] Similarly, when transferring energy from the second battery to the first battery, if the second state parameter has reached its lower limit, but the difference between the first and second state parameters is still greater than a preset range, the discharge of the first and second batteries can be stopped. Alternatively, energy can be replenished to the first battery through other devices until the difference between the first and second state parameters is within a preset range.

[0102] In the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0103] Furthermore, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0104] The battery energy management method of the present application embodiments has been described in detail above. The battery system of the present application embodiments will be described below. It should be understood that the battery system of the present application embodiments can execute the battery energy management method of the present application embodiments.

[0105] Figure 5 A schematic block diagram of a battery system 500 according to an embodiment of this application is shown. The battery system 500 may include a first battery and a second battery, and the battery system includes independently configured energy regions, with the first battery and the second battery respectively disposed in two energy regions.

[0106] like Figure 5 As shown, the battery system 500 includes: The processing unit 510 is configured to acquire a first state parameter and a second state parameter, wherein the first state parameter includes the voltage of the first battery and / or the state of charge (SOC) of the first battery, and the second state parameter includes the voltage of the second battery and / or the state of charge (SOC) of the second battery.

[0107] The control unit 520 is configured to control energy transfer between the first battery and the second battery based on the first state parameter and the second state parameter until the difference between the first state parameter and the second state parameter is within a preset range.

[0108] The control unit 520 is further configured to, when the first state parameter reaches a first state parameter lower limit, control the first battery to stop transferring energy to the second battery when the first battery is transferring energy to the second battery; and when the second state parameter reaches a second state parameter lower limit when the second battery is transferring energy to the first battery.

[0109] Optionally, in this embodiment of the application, the processing unit 510 is specifically used to: acquire the first state parameter and the second state parameter during the discharge process of the first battery and the second battery; the control unit 520 is specifically used to: during the discharge process of the first battery and the second battery, when the first state parameter is less than or equal to a first threshold, control the second battery to transfer energy to the first battery; or when the second state parameter is less than or equal to a second threshold, control the first battery to transfer energy to the second battery.

[0110] Optionally, in this embodiment of the application, the processing unit 510 is specifically used to: acquire the first state parameter and the second state parameter before the first battery and the second battery discharge; the control unit 520 is specifically used to: control the second battery to transfer energy to the first battery when the first state parameter is less than the second state parameter before the first battery and the second battery discharge; or control the first battery to transfer energy to the second battery when the second state parameter is less than the first state parameter.

[0111] Optionally, in the embodiments of this application, the lower limit of the first state parameter is determined based on at least one of the properties of the first battery, temperature, and discharge rate; and / or the lower limit of the second state parameter is determined based on at least one of the properties of the second battery, temperature, and discharge rate.

[0112] Optionally, in this embodiment, the first battery and the second battery are connected in series via a voltage converter; the control unit 520 is specifically used to control the first battery and the second battery to perform energy transfer through the voltage converter.

[0113] Optionally, in the embodiments of this application, both the first battery and the second battery are power batteries, or both the first battery and the second battery are energy batteries.

[0114] Optionally, in the embodiments of this application, the first battery is a power battery and the second battery is an energy battery; or the first battery is an energy battery and the second battery is a power battery.

[0115] It should be understood that the battery system 500 can perform the corresponding operations in the battery energy management method 300, which will not be elaborated here for the sake of brevity.

[0116] Figure 6 This is a schematic diagram of the hardware structure of a battery management system 600 according to an embodiment of this application. The battery management system 600 includes a memory 610, a processor 620, a communication interface 630, and a bus 640. The memory 610, the processor 620, and the communication interface 630 are interconnected via the bus 640.

[0117] The memory 610 may be a read-only memory (ROM), a static storage device, or a random access memory (RAM). The memory 610 may store a program, and when the program stored in the memory 610 is executed by the processor 620, the processor 620 and the communication interface 630 are used to execute the various steps of the battery energy management method of the embodiments of this application.

[0118] The processor 620 may be a general-purpose central processing unit (CPU), microprocessor, application-specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute relevant programs to achieve the functions required by the units in the battery management system 600 of this application embodiment, or to execute the battery energy management method of this application embodiment.

[0119] The processor 620 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the battery energy management method of this application embodiment can be completed by the integrated logic circuitry in the processor 620 or by software instructions.

[0120] The processor 620 described above can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly implemented by the hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 610. The processor 620 reads the information in memory 610 and, in conjunction with its hardware, completes the functions required by the units included in the battery management system 600 of the embodiments of this application, or executes the battery energy management method of the embodiments of this application.

[0121] The communication interface 630 uses a transceiver device, such as, but not limited to, a transceiver, to enable communication between the battery management system 600 and other devices or communication networks.

[0122] Bus 640 may include a pathway for transmitting information between various components of the battery management system 600 (e.g., memory 610, processor 620, communication interface 630).

[0123] It should be noted that although the battery management system 600 described above only shows a memory, processor, and communication interface, those skilled in the art should understand that in specific implementations, the battery management system 600 may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the battery management system 600 may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the battery management system 600 may only include the devices necessary for implementing the embodiments of this application, and may not necessarily include... Figure 6 All the devices shown.

[0124] like Figure 7As shown in the figure, this application embodiment also provides an electrical device 700, which includes a first load 710, a second load 720 and a battery system 730, wherein the battery system 730 is connected to the first load 710 and is used to provide a first DC power to the first load 710, and / or the battery system 730 is connected to the second load 720 and is used to provide a second DC power to the second load 720, wherein the voltage of the first DC power is greater than a voltage threshold and the voltage of the second DC power is less than a voltage threshold.

[0125] In other words, the first load 710 is a high-voltage load, the second load 720 is a low-voltage load, and the battery system 730 provides low-voltage power to the first load 710 and high-voltage power to the second load 720.

[0126] The battery system 730 may include, for example, the battery system 500 described above, and the electrical device 700 may be an electric vehicle.

[0127] This application also provides a computer-readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0128] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0129] This application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the above-described battery energy management method.

[0130] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery energy management method, characterized in that, The method is applied to a battery system including a first battery and a second battery, the battery system including independently configured energy regions, the first battery and the second battery being respectively disposed in two energy regions within the energy regions, the method comprising: Obtain a first state parameter and a second state parameter, wherein the first state parameter includes the voltage of the first battery and / or the SOC of the first battery, and the second state parameter includes the voltage of the second battery and / or the SOC of the second battery; Based on the first state parameter and the second state parameter, control the energy transfer between the first battery and the second battery until the difference between the first state parameter and the second state parameter is within a preset range; When the first battery is transferring energy to the second battery, if the first state parameter reaches the lower limit of the first state parameter, the first battery is controlled to stop transferring energy to the second battery. When the second battery is transferring energy to the first battery, if the second state parameter reaches the lower limit of the second state parameter, the second battery is controlled to stop transferring energy to the first battery.

2. The method according to claim 1, characterized in that, The acquisition of the first state parameter and the second state parameter includes: During the discharge process of the first battery and the second battery, the first state parameter and the second state parameter are acquired; The step of controlling energy transfer between the first battery and the second battery based on the first state parameter and the second state parameter includes: During the discharge process of the first battery and the second battery, if the first state parameter is less than or equal to the first threshold, the second battery is controlled to transfer energy to the first battery; or When the second state parameter is less than or equal to the second threshold, control the first battery to transfer energy to the second battery.

3. The method according to claim 1, characterized in that, The acquisition of the first state parameter and the second state parameter includes: Before the first battery and the second battery discharge, the first state parameter and the second state parameter are acquired. The step of controlling energy transfer between the first battery and the second battery based on the first state parameter and the second state parameter includes: Before the first battery and the second battery discharge, if the first state parameter is less than the second state parameter, control the second battery to transfer energy to the first battery; or When the second state parameter is less than the first state parameter, control the first battery to transfer energy to the second battery.

4. The method according to any one of claims 1 to 3, characterized in that, The lower limit of the first state parameter is determined based on at least one of the properties of the first battery, temperature, and discharge rate; and / or The lower limit of the second state parameter is determined based on at least one of the properties of the second battery, temperature, and discharge rate.

5. The method according to any one of claims 1 to 3, characterized in that, The first battery and the second battery are connected in series via a voltage converter; The control of energy transfer between the first battery and the second battery includes: The first battery and the second battery are controlled to transfer energy through the voltage converter.

6. The method according to any one of claims 1 to 3, characterized in that, Both the first battery and the second battery are power batteries, or both the first battery and the second battery are energy batteries.

7. The method according to any one of claims 1 to 3, characterized in that, The first battery is a power battery, and the second battery is an energy battery; or The first battery is an energy-type battery, and the second battery is a power-type battery.

8. A battery system, characterized in that, The battery system includes a first battery and a second battery, which are respectively disposed in two energy zones. The battery system includes: The processing unit is configured to acquire a first state parameter and a second state parameter, wherein the first state parameter includes the voltage of the first battery and / or the state of charge (SOC) of the first battery, and the second state parameter includes the voltage of the second battery and / or the state of charge (SOC) of the second battery. The control unit is configured to control the energy transfer between the first battery and the second battery according to the first state parameter and the second state parameter until the difference between the first state parameter and the second state parameter is within a preset range. The control unit is further configured to, when the first battery is transferring energy to the second battery, if the first state parameter reaches the lower limit of the first state parameter, control the first battery to stop transferring energy to the second battery; and when the second battery is transferring energy to the first battery, if the second state parameter reaches the lower limit of the second state parameter, control the second battery to stop transferring energy to the first battery.

9. An electrical device, characterized in that, include: First load; Second load; According to claim 8, the battery system is connected to the first load to provide a first direct current to the first load, and / or the battery system is connected to the second load to provide a second direct current to the second load, wherein the voltage of the first direct current is greater than a voltage threshold and the voltage of the second direct current is less than a voltage threshold.

10. A battery management system, characterized in that, include: Memory, used to store programs; A processor is configured to execute a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to execute the battery energy management method according to any one of claims 1 to 7.

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