CN120921987A - Battery energy management method, battery system, electricity consumption device and battery management system - Google Patents
Battery energy management method, battery system, electricity consumption device and battery management systemInfo
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- CN120921987A CN120921987A CN202511443077.0A CN202511443077A CN120921987A CN 120921987 A CN120921987 A CN 120921987A CN 202511443077 A CN202511443077 A CN 202511443077A CN 120921987 A CN120921987 A CN 120921987A
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- battery
- state parameter
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- voltage
- transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本申请实施例提供了一种电池能量管理方法、电池系统、用电装置和电池管理系统，多个电池可同时满放。该方法应用于包括第一电池和第二电池的电池系统，第一电池和第二电池设置在电池系统的两个能量区中，该方法包括：获取第一状态参数和第二状态参数，第一状态参数包括第一电池的电压和/或SOC，第二状态参数包括第二电池的电压和/或SOC；根据第一状态参数和第二状态参数，控制第一电池和第二电池之间进行能量转移；第一电池向第二电池进行能量转移时，若第一状态参数达到第一状态参数下限，控制第一电池停止转移能量；第二电池向第一电池进行能量转移时，若第二状态参数达到第二状态参数下限，控制第二电池停止转移能量。
This application provides a battery energy management method, a battery system, an electrical device, and a battery management system, allowing multiple batteries to be fully discharged simultaneously. The method is applied to a battery system including a first battery and a second battery, which are located in two energy zones of the battery system. The method includes: acquiring a first state parameter and a second state parameter, the first state parameter including the voltage and/or state of charge (SOC) of the first battery, and the second state parameter including the voltage and/or SOC of the second battery; controlling energy transfer between the first battery and the second battery based on the first and second state parameters; when transferring energy from the first battery to the second battery, if the first state parameter reaches a lower limit, controlling the first battery to stop transferring energy; when transferring energy from the second battery to the first battery, if the second state parameter reaches a lower limit, controlling the second battery to stop transferring energy.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a battery energy management method, a battery system, an electric device, and a battery management system.
Background
Electric vehicles have been attracting attention as new energy vehicles in various fields once they are introduced. For electric vehicles, battery technology is an important factor in the development thereof.
Therefore, how to improve the performance of the battery is a problem to be solved.
Disclosure of Invention
The embodiment of the application provides a battery energy management method, a battery system, an electric device and a battery management system, which can realize the aim of simultaneously fully discharging a plurality of batteries.
In a first aspect, a battery energy management method is provided, the method is applied to a battery system comprising a first battery and a second battery, the battery system comprises an energy zone which is independently arranged, the first battery and the second battery are respectively arranged in two energy zones in the energy zone, the method comprises the steps of obtaining a first state parameter and a second state parameter, the first state parameter comprises the voltage of the first battery and/or the SOC of the first battery, the second state parameter comprises the voltage of the second battery and/or the SOC of the second battery, energy transfer between the first battery and the second battery is controlled according to the first state parameter and the second state parameter until a difference value between the first state parameter and the second state parameter is within a preset range, and if the first state parameter reaches a lower limit of the first state parameter, the first battery stops transferring energy to the second battery, and if the first state parameter reaches a lower limit of the second state parameter, the second battery stops transferring energy to the second battery, and if the first state parameter reaches the lower limit of the second state parameter, the second battery stops transferring energy to the second battery.
According to the embodiment of the application, under the condition that the two batteries are arranged in different energy areas, the energy transfer between the two batteries is controlled according to the state parameters of the two batteries until the difference value between the state parameters of the two batteries is within the preset range, so that if the first battery and the second battery are discharged, the first battery and the second battery can be fully discharged at the same time, and the possibility of overdischarge of one battery is reduced. In addition, energy transfer is carried out between the first battery and the second battery, so that the energy of the two batteries is fully utilized, and the energy utilization rate is improved. In addition, in the energy transfer process, if the state parameter of the battery with the high state parameter reaches the lower limit, the energy transfer is stopped, the probability that the battery with the high state parameter reaches the state such as under voltage can be reduced, and the battery with the high state parameter can continue to work normally.
Further, the first battery and the second battery are respectively arranged in different energy areas, namely, the battery system is subjected to redundant design, so that in the using process of the power utilization device, if one battery is abnormal, the other battery can continuously supply power to the power utilization device, and the power utilization device can continuously work normally.
In some possible implementations, the acquiring the first state parameter and the second state parameter includes acquiring the first state parameter and the second state parameter during discharging of the first battery and the second battery, and controlling energy transfer between the first battery and the second battery according to 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 or equal to a first threshold value during discharging of the first battery and the second battery, 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 value.
According to the technical scheme, the first state parameter and the second state parameter are obtained in the discharging process of the first battery and the second battery, and energy transfer is carried out based on the first state parameter and the second state parameter, so that the accuracy of energy transfer can be improved, and the possibility that the two batteries are fully discharged at the same time can be further improved.
In some possible implementations, the acquiring the first state parameter and the second state parameter includes acquiring the first state parameter and the second state parameter before the first battery and the second battery are discharged, and the controlling the energy transfer between the first battery and the second battery according to the first state parameter and the second state parameter includes controlling the second battery to transfer energy to the first battery if the first state parameter is smaller than the second state parameter before the first battery and the second battery are discharged, or controlling the first battery to transfer energy to the second battery if the second state parameter is smaller than the first state parameter.
According to the technical scheme, the state parameters of the two batteries are obtained before discharging, and the battery with the high state parameter is controlled to transfer energy to the battery with the low state parameter according to the size between the two state parameters before discharging, so that the discharging process of the two batteries is not influenced by the energy transfer process, and the discharging efficiency of the first battery and the second battery can be improved.
In some possible implementations, the first state parameter lower limit is determined from at least one of a property, a temperature, and a discharge rate of the first battery, and/or the second state parameter lower limit is determined from at least one of a property, a temperature, and a discharge rate of the second battery.
According to the technical scheme, the first state parameter is determined according to at least one of the attribute, the temperature and the discharge multiplying power of the first battery, and/or the second state parameter is determined according to at least one of the attribute, the temperature and the discharge multiplying power of the first battery, so that the determined lower limit of the first state parameter and the determined lower limit of the second state parameter are accurate, and the possibility of overdischarge of the first battery or the second battery can be further reduced.
In some possible implementations, the first battery and the second battery are connected in series through a voltage converter, and the controlling the energy transfer between the first battery and the second battery includes controlling the first battery and the second battery to transfer energy through the voltage converter.
According to the technical scheme, the first battery and the second battery are connected through the voltage converter, and the first battery and the second battery are subjected to energy transfer through the voltage converter, so that the battery system is convenient to realize, and can meet different voltage requirements through the voltage converter, and the applicability of the battery system is improved.
In some possible implementations, the first battery and the second battery are both power-type batteries, or the first battery and the second battery are both energy-type batteries.
According to the technical scheme, the first battery and the second battery are both set to be energy type batteries or power type batteries, so that the types of the first battery and the second battery are consistent, the discharge rate is also consistent, the frequency of energy transfer in the discharge process can be reduced, and the discharge efficiency is improved.
In some possible implementations, the first battery is a power type battery and the second battery is an energy type battery, or the first battery is an energy type battery and the second battery is a power type battery.
According to the technical scheme, the first battery and the second battery are set to be different types of batteries, so that the battery system can meet different use scenes, and the battery system can exert the performance under more conditions.
In a second aspect, a battery system is provided, which comprises a first battery and a second battery, wherein the first battery and the second battery are respectively arranged in two energy areas, the battery system comprises a processing unit, the processing unit is used for acquiring a first state parameter and a second state parameter, the first state parameter comprises a first battery side voltage and/or an SOC (state of charge) of the first battery, the second state parameter comprises a voltage of the second battery and/or an SOC (state of charge) of the second battery, the control unit is used for controlling energy transfer between the first battery and the second battery according to the first state parameter and the second state parameter until a difference value between the first state parameter and the second state parameter is in a preset range, and the control unit is further used for controlling the first battery to stop transferring energy to the second battery if the first state parameter reaches a lower limit of the first state parameter and controlling the first battery to stop transferring energy to the second battery if the first state parameter reaches a lower limit of the second state parameter and controlling the second battery to stop transferring energy to the second battery if the first state parameter reaches the second state parameter and the second battery reaches a lower limit of the second state parameter.
In a third aspect, an electric device is provided, which comprises a first load, a second load and the battery system in the second aspect, wherein the battery system is connected with the first load and is used for providing a first direct current for the first load, and/or the battery system is connected with the second load and is used for providing a second direct current for the second load, the voltage of the first direct current is larger than a voltage threshold, and the voltage of the second direct current is smaller than the voltage threshold.
In a fourth aspect, there is provided a battery management system comprising a processor and a memory, the memory for storing a computer program, the processor for invoking the computer program to perform the method of the first aspect or implementations thereof.
In a fifth aspect, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the method of the first aspect or implementations thereof.
In a sixth aspect, there is provided a computer program product comprising computer program instructions which, when executed by a computer, cause the computer to perform the method of the first aspect or implementations thereof.
Drawings
Fig. 1 shows a schematic diagram of a battery comprising two energy zones according to an embodiment of the application.
Fig. 2 shows a schematic flow chart of a battery energy management method according to an embodiment of the application.
Fig. 3 shows a schematic flow chart of another battery energy management method of an embodiment of the application.
Fig. 4 shows a schematic diagram of energy transfer between a first battery and a second battery via bi-directional DC/DC in an embodiment of the application.
Fig. 5 shows a schematic block diagram of a battery system according to an embodiment of the present application.
Fig. 6 shows a schematic block diagram of another battery management system of an embodiment of the present application.
Fig. 7 shows a schematic diagram of an electrical device according to an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Unless defined otherwise, 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 in this description of the application are used for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.
The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, or may be directly connected or indirectly connected via an intermediate medium, for example. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.
The term "plurality" as used herein means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).
In the field of new energy, batteries are of self-evident importance as a main power source for electric devices, such as motor vehicles, ships or spacecraft. In order to further improve the performance and safety of the battery, a plurality of independently operated energy regions may be provided, for example, as shown in fig. 1, two independent energy regions may be provided, so that multiple redundancy designs and energy management such as high-voltage flexible power supply, low-voltage flexible power supply, thermal management redundancy, thermal runaway isolation and the like may be realized.
The independent energy area is arranged, so that the stability of power output can be ensured, the possibility that the power utilization device is influenced due to power failure is reduced, and when a single area fails, the other area can be used for maintaining power supply, and the power utilization device can still normally operate. Meanwhile, the independent energy areas are divided, so that the battery system can be designed more flexibly, and different use scenes can be met. For example, the independent energy regions can be matched with the battery cells with different temperature performances and are controlled by the temperature control regions independently, so that the battery system can adapt to the extremely cold and high-temperature environments at the same time, and the battery system can exert the performances under more working conditions.
At this time, the battery system of the multi-energy zone (multi-battery pack) requires the plurality of batteries to reach full discharge simultaneously during discharging. If a plurality of batteries do not reach full discharge at the same time, the phenomenon of 'no discharge of the current' may occur, and the situation of over discharge of the batteries may also occur, so as to influence the use of the batteries.
In view of this, an embodiment of the present application provides a battery energy management method applied to a battery system including a first battery and a second battery, the battery system including independently provided energy regions, the first battery and the second battery being provided in two of the energy regions, respectively. The method comprises the steps of obtaining a first state parameter and a second state parameter, wherein the first state parameter comprises the voltage of a first battery and/or the state of charge (SOC) of the first battery, the second state parameter comprises the voltage of a second battery and/or the SOC of the second battery, and then controlling energy transfer between the first battery and the second battery according to the first state parameter and the second state parameter until the difference value between the first state parameter and the second state parameter is within a preset range.
According to the technical scheme, under the condition that the two batteries are arranged in different energy areas, energy transfer is conducted between the two batteries according to the state parameters of the two batteries until the difference value between the state parameters of the two batteries is within the preset range, so that if the first battery and the second battery are discharged, the first battery and the second battery can be fully discharged at the same time, and the possibility of overdischarge of one battery is reduced. In addition, energy transfer is carried out between the first battery and the second battery, so that the energy of the two batteries is fully utilized, and the energy utilization rate is improved.
Further, the first battery and the second battery are respectively arranged in different energy areas, namely, the battery system is subjected to redundant design, so that in the using process of the power utilization device, if one battery is abnormal, the other battery can continuously supply power to the power utilization device, and the power utilization device can continuously work normally.
The technical solutions described in the embodiments of the present application are applicable to various devices using batteries, for example, mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecraft, and the like, and for example, spacecraft include airplanes, rockets, space shuttles, spacecraft, and the like.
It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described devices, but may be applied to all devices using batteries, but for simplicity of description, the following embodiments are described by taking electric vehicles as examples.
Embodiments of the present application may be 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, nickel-metal hydride batteries, lithium-air batteries, sodium batteries, and the like, depending on the type of battery. The lithium ion battery may be, for example, a ternary battery, a lithium iron phosphate battery, or the like, as examples. The battery in the embodiment of the present application may be a battery module, a battery pack, or the like in terms of the scale of the battery. In the embodiment of the application, the specific type and scale of the battery are not particularly limited.
Fig. 2 shows a schematic flow chart of a battery energy management method 200 according to an embodiment of the application. The method 200 may be applied to a battery system including a first battery and a second battery, the battery system including separately disposed energy zones, the first battery and the second battery being disposed in two of the energy zones, respectively.
The method 200 may include at least some of the following.
S210, acquiring a first state parameter and a second state parameter.
And S220, controlling 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 value between the first state parameter and the second state parameter is within a preset range.
Fig. 3 shows a schematic flow chart of another battery energy management method 300 of an embodiment of the application. The method 300 is equally applicable to a battery system comprising a first battery and a second battery, the battery system comprising separately arranged energy zones, the first battery and the second battery being arranged in two of the energy zones, respectively.
The method 300 may include at least some of the following.
S310, acquiring a first state parameter and a second state parameter.
And S320, controlling 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 value between the first state parameter and the second state parameter is within a preset range.
And S330, controlling the first battery to stop transferring energy to the second battery if the first state parameter reaches the lower limit of the first state parameter under the condition that the first battery transfers energy to the second battery, and controlling the second battery to stop transferring energy to the first battery if the second state parameter reaches the lower limit of the second state parameter under the condition that the second battery transfers energy to the first battery.
Wherein the first state parameter comprises a voltage in the first battery and/or an SOC of the first battery and the second state parameter may comprise a voltage of the second battery and/or an SOC of the second battery.
According to the embodiment of the application, under the condition that the two batteries are arranged in different energy areas, the energy transfer between the two batteries is controlled according to the state parameters of the two batteries until the difference value between the state parameters of the two batteries is within the preset range, so that if the first battery and the second battery are discharged, the first battery and the second battery can be fully discharged at the same time, and the possibility of overdischarge of one battery is reduced. In addition, energy transfer is carried out between the first battery and the second battery, so that the energy of the two batteries is fully utilized, and the energy utilization rate is improved.
Further, the first battery and the second battery are respectively arranged in different energy areas, namely, the battery system is subjected to redundant design, so that in the using process of the power utilization device, if one battery is abnormal, the other battery can continuously supply power to the power utilization device, and the power utilization device can continuously work normally.
In addition, in the energy transfer process, if the state parameter of the battery with the high state parameter reaches the lower limit, the energy transfer is stopped, the probability that the battery with the high state parameter reaches the state such as under voltage can be reduced, and the battery with the high state parameter can continue to work normally.
The battery system may specifically be composed of a battery and a battery management system. The battery system comprises a first battery and a second battery, wherein the first battery and the second battery can be a battery pack, a battery module or a battery set formed by electrically connecting battery cells.
The energy regions are parts of the battery system which can realize independent operation and control, for example, each energy region can be charged and discharged independently, and the energy regions can be divided according to the arrangement of batteries in the battery system. Alternatively, when the battery system includes one or more battery packs, the energy regions may be divided inside each battery pack, the first battery and the second battery may be disposed in different energy regions in each battery pack, and a partition beam may be disposed between the energy regions to isolate between the energy regions. Or when the battery system comprises a plurality of battery packs, each battery pack can be used as an energy area, and a plurality of energy areas are formed among the plurality of battery packs.
It should be understood that the first battery in the embodiment of the present application may also be referred to as a first battery pack, and the second battery may also be referred to as a second battery pack.
The voltage of the first battery may be the lowest voltage or the average voltage of the plurality of battery cells in the first battery, and the voltage of the second battery may be the lowest voltage or the average voltage of the plurality of battery cells in the second battery.
If the voltage of the first battery is the lowest voltage among the plurality of battery cells in the first battery, the voltage of the second battery is also the lowest voltage among the plurality of battery cells in the second battery.
In addition to the voltage and the SOC, the first state parameter may include other parameters such as a temperature of the first battery, a state of health (SOH) of the first battery, and the like. Similarly, the second state parameter may also include other parameters such as the temperature of the second battery, SOH of the second battery, and the like. The temperature of the first battery may be the lowest temperature of the plurality of battery cells, the highest temperature of the plurality of battery cells, or the average temperature of the plurality of battery cells in the first battery. The temperature of the second battery may be the lowest temperature of the plurality of battery cells, the highest temperature of the plurality of battery cells, or the average temperature of the plurality of battery cells in the second battery.
Wherein the first battery and the second battery may be connected in series. Alternatively, the first battery and the second battery may be connected by a voltage converter. At this time, S220 may include controlling the first battery and the second battery to transfer energy through the voltage converter.
The voltage converter may be a direct current/direct current (DC/DC) converter, a flyback converter, or a device or circuit for implementing power input/output conversion.
The DC/DC converter may be a unidirectional DC/DC converter. For example, the first battery and the second battery may be connected by two unidirectional DC/DC converters, one for the first battery to transfer energy to the second battery and the other for the second battery to transfer energy to the first battery.
The DC/DC converter may also be a bi-directional DC/DC converter. As shown in fig. 4, the first battery and the second battery may be connected by a bidirectional DC/DC converter, and the number of the bidirectional DC/DC converters may be one. At this time, the first battery and the second battery may be controlled to perform energy transfer through the bidirectional DC/DC converter.
The first battery and the second battery are connected through the bidirectional DC/DC converter, and energy transfer is carried out between the first battery and the second battery through the bidirectional DC/DC converter, so that the bidirectional DC/DC converter is convenient to realize, only one DC/DC converter is needed through the connection of the bidirectional DC/DC converter, the occupied space of the DC/DC converter is reduced, and the cost is reduced.
Or the first battery and the second battery may be connected in parallel.
The types of the first battery and the second battery are not particularly limited in the embodiment of the application. The types of the first battery and the second battery may or may not be identical. The battery types of the battery cells in the first battery may be uniform or non-uniform, and the battery types of the battery cells in the second battery may be uniform or non-uniform.
In some embodiments, the type of the first battery may not be consistent with the type of the second battery, as long as the output of the first battery and the second battery meet the system requirements.
For example, the first battery may be a power type battery and the second battery may be an energy type battery. Or the first battery may be an energy type battery and the second battery may be a power type battery.
According to the technical scheme, the first battery and the second battery are set to be different types of batteries, so that the battery system can meet different use scenes, and the battery system can exert the performance under more conditions.
The power type battery can provide power output, meets a large amount of energy requirements in a short time, and can be used for an electric driving system of an electric device, such as acceleration, climbing and the like. The energy type battery can store as much energy as possible, and is applicable to an electric device with longer endurance mileage requirements.
Or the types of the first battery and the second battery may be set to be identical.
In some embodiments, the first battery and the second battery may both be energy type batteries, or the first battery and the second battery may both be power type batteries. According to the technical scheme, the first battery and the second battery are both set to be energy type batteries or power type batteries, so that the types of the first battery and the second battery are consistent, the discharge rate is also consistent, the frequency of energy transfer in the discharge process can be reduced, and the discharge efficiency is improved.
Alternatively, the preset range may be specifically determined according to the actual situation. For example, the preset range may be determined according to application scenarios of the first battery and the second battery, or may be determined according to attribute parameters of the first battery and the second battery.
In some embodiments, the preset range may be determined based on at least one parameter of a capacity of the first battery, a capacity of the second battery, a number of battery cells included in the first battery, a number of battery cells included in the second battery, and a transfer efficiency of the DC/DC.
For example, if the first and second state parameters include voltages, the preset range may be 0 volts (V) -5V. For example, the preset range is 1V-4V, 0V-3V, 0V-2V, etc. If the first state parameter and the second state parameter include SOC, the preset range may be 0% -5%. For example, the preset range is 0% -4%, 0% -3% or 0-2%, etc.
In some embodiments, the first state parameter and the second state parameter may be obtained during discharge of the first battery and the second battery. At this time, the second battery may be controlled to transfer energy to the first battery in the case where the first state parameter is less than or equal to the first threshold value, or the first battery may be controlled to transfer energy to the second battery in the case where the second state parameter is less than or equal to the second threshold value.
According to the technical scheme, the first state parameter and the second state parameter are obtained in the discharging process of the first battery and the second battery, and energy transfer is carried out based on the first state parameter and the second state parameter, so that the accuracy of energy transfer can be improved, and the possibility that the two batteries are fully discharged at the same time can be further improved.
The first state parameter and the second state parameter may be acquired in real time during the discharging of the first battery and the second discharge. Or the first state parameter and the second state parameter may be acquired once every preset time, and the preset time may be, for example, 10ms, 1s, 5s, 10s, or the like. Still alternatively, the first state parameter and the second state parameter may be acquired randomly, for example, the first state parameter and the second state parameter may be acquired once at 10s of the discharge, then the first state parameter and the second state parameter are acquired once at 15s of the discharge, and then the first state parameter and the second state parameter are acquired once at 30s of the discharge.
The first threshold may be determined empirically by the user or may be determined based on a plurality of parameters, such as the first battery's own capacity, the first battery's temperature, the ambient temperature, the driving mode of the powered device, etc. The driving mode may include, for example, a sport mode, a comfort mode, and the like. Alternatively, the first threshold may be an under-voltage threshold of the first battery.
Similarly, the second threshold may be determined based on empirical values, or the second threshold may be determined based on a plurality of parameters, such as the self-capabilities of the second battery (e.g., power capabilities, etc.), the temperature of the second battery, the ambient temperature, the driving mode of the powered device, etc. The driving mode may include, for example, a sport mode, a comfort mode, and the like. Alternatively, the second threshold may be an under-voltage threshold of the second battery.
The first threshold may be the same as or different from the second threshold, which is not specifically limited in the embodiment of the present application.
It should be noted that, during the discharging process, the energy transfer may be performed multiple times based on the first state parameter and the second state.
In other embodiments, the first state parameter and the second state parameter may be acquired prior to discharging, and then the second battery is controlled to transfer energy to the first battery if the first state parameter is less than the second state parameter, or the first battery is controlled to transfer energy to the second battery if the second state parameter is less than the first state parameter.
According to the technical scheme, the state parameters of the two batteries are obtained before discharging, and the battery with the high state parameter is controlled to transfer energy to the battery with the low state parameter according to the size between the two state parameters before discharging, so that the discharging process of the two batteries is not influenced by the energy transfer process, and the discharging efficiency of the first battery and the second battery can be improved.
Before discharging, energy transfer is carried out on the first battery and the second battery, so that the difference value between the first state parameter and the second state parameter is within a preset range, and in the discharging process, the voltage dropping rate of the first battery and the voltage dropping rate of the second battery are relatively close, and the purpose that the first battery and the second battery are fully discharged simultaneously can be achieved.
After energy transfer is performed before discharging, the first state parameter and the second state parameter can be continuously acquired in the discharging process, and energy transfer is performed based on the first state parameter and the second state parameter in the discharging process.
In other embodiments, it may be determined which of the first and second batteries will be fully charged in advance before discharging based on the first and second state parameters, and after the first and second batteries are discharged for a certain time, the fully charged batteries may be controlled to transfer energy to the other battery.
In the energy transfer process, if the first battery transfers energy to the second battery, the first battery can transfer energy to the second battery until the first state parameter reaches the lower limit of the first state parameter until the difference value between the first state parameter and the second state parameter is within a preset range. Similarly, during the energy transfer process, if the second battery transfers energy to the first battery, the second battery may transfer energy to the first battery until the second state parameter reaches the lower limit of the second state parameter, until the difference between the first state parameter and the second state parameter is within the preset range.
The first state parameter lower limit may be an under-voltage threshold of the first battery and the second state parameter lower limit may be an under-voltage threshold of the second battery.
The first and second lower state parameter limits may be fixed, i.e. the first lower state parameter limit is the same for the first battery, regardless of any scenario at any time, or the second lower state parameter limit is the same for the second battery, regardless of any scenario at any time.
Of course, the first and second lower state parameter limits may vary with other parameters.
In some embodiments, the first state parameter lower limit may be determined according to at least one of an attribute, a temperature, and a discharge rate of the first battery. For example, the larger the discharge magnification of the first battery, the smaller the first state parameter lower limit.
The second state parameter lower limit may also be determined according to at least one of the property, temperature, and discharge rate of the first battery.
According to the technical scheme, the first state parameter is determined according to at least one of the attribute, the temperature and the discharge multiplying power of the first battery, and/or the second state parameter is determined according to at least one of the attribute, the temperature and the discharge multiplying power of the first battery, so that the determined lower limit of the first state parameter and the determined lower limit of the second state parameter are accurate, and the possibility of overdischarge of the first battery or the second battery can be further reduced.
Under the condition that the first battery transfers energy to the second battery, if the first state parameter reaches the lower limit of the first state parameter, but the difference value between the first state parameter and the second state parameter is still larger than the preset range, the discharging of the first battery and the second battery can be stopped, or the second battery can be supplemented with energy through other equipment until the difference value between the first state parameter and the second state parameter is within the preset range.
Similarly, in the case where the second battery transfers energy to the first battery, if the second state parameter has reached the lower limit of the second state parameter, but the difference between the first state parameter and the second state parameter is still greater than the preset range, the discharging of the first battery and the second battery may be stopped, or the first battery may be replenished with energy by other devices until the difference between the first state parameter and the second state parameter is within the preset range.
In the embodiment of the present application, the sequence number of each process does not mean the sequence of execution sequence, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.
On the premise of no conflict, the embodiments and/or technical features in the embodiments described in the present application can be combined with each other arbitrarily, and the combined technical solutions should also fall into the protection scope of the present application.
The battery energy management method of the embodiment of the present application is described in detail above, and the battery system of the embodiment of the present application will be described below. It should be understood that the battery system in the embodiment of the present application may perform the battery energy management method in the embodiment of the present application.
Fig. 5 shows a schematic block diagram of a battery system 500 of an embodiment of the application. The battery system 500 may include a first battery and a second battery, the battery system including separately provided energy regions, the first battery and the second battery being respectively provided in two of the energy regions.
As shown in fig. 5, the battery system 500 includes:
A processing unit 510, configured to obtain a first state parameter and a second state parameter, where the first state parameter includes a voltage of the first battery and/or an SOC of the first battery, and the second state parameter includes a voltage of the second battery and/or an SOC of the second battery.
And the control unit 520 is 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 a difference between the first state parameter and the second state parameter is within a preset range.
The control unit 520 is further configured to control the first battery to stop transferring energy to the second battery if the first state parameter reaches a first state parameter lower limit, and control the second battery to stop transferring energy to the first battery if the second state parameter reaches a second state parameter lower limit, in the case of transferring energy to the first battery.
Optionally, in the embodiment of the present application, the processing unit 510 is specifically configured to obtain the first state parameter and the second state parameter during discharging of the first battery and the second battery, and the control unit 520 is specifically configured to control, during discharging of the first battery and the second battery, the second battery to transfer energy to the first battery if the first state parameter is less than or equal to a first threshold value, or to control the first battery to transfer energy to the second battery if the second state parameter is less than or equal to a second threshold value.
Optionally, in the embodiment of the present application, the processing unit 510 is specifically configured to obtain the first state parameter and the second state parameter before the first battery and the second battery are discharged, and the control unit 520 is specifically configured to control, before the first battery and the second battery are discharged, the second battery to transfer energy to the first battery if the first state parameter is smaller than the second state parameter, or to control, if the second state parameter is smaller than the first state parameter, the first battery to transfer energy to the second battery.
Optionally, in an embodiment of the present application, the first state parameter lower limit is determined according to at least one of an attribute, a temperature, and a discharge rate of the first battery, and/or the second state parameter lower limit is determined according to at least one of an attribute, a temperature, and a discharge rate of the second battery.
Alternatively, in the embodiment of the application, the first battery and the second battery are connected in series through a voltage converter, and the control unit 520 is specifically configured to control the first battery and the second battery to transfer energy through the voltage converter.
Optionally, in an embodiment of the present application, the first battery and the second battery are both power batteries, or the first battery and the second battery are both energy batteries.
Optionally, in the embodiment of the application, the first battery is a power type battery, the second battery is an energy type battery, or the first battery is an energy type battery, and the second battery is a power type battery.
It should be appreciated that the battery system 500 may implement the corresponding operations in the battery energy management method 300, and for brevity, will not be described in detail herein.
Fig. 6 is a schematic diagram of a hardware configuration of a battery management system 600 according to an embodiment of the present application. The battery management system 600 includes a memory 610, a processor 620, a communication interface 630, and a bus 640. Wherein the memory 610, the processor 620, and the communication interface 630 implement communication connection therebetween through the bus 640.
The memory 610 may be a read-only memory (ROM), a static storage device, and a random access memory (random access memory, RAM). The memory 610 may store programs that, when executed by the processor 620, the processor 620 and the communication interface 630 are configured to perform the steps of the battery energy management method of an embodiment of the present application.
The processor 620 may employ a general-purpose central processing unit (central processing unit, CPU), microprocessor, application SPECIFIC INTEGRATED Circuit (ASIC), graphics processor (graphics processing unit, GPU) or one or more integrated circuits for executing associated programs to perform functions required by the elements in the battery management system 600 of an embodiment of the present application, or to perform battery energy management methods of an embodiment of the present application.
The processor 620 may also be an integrated circuit chip with signal processing capabilities. In implementation, various steps of the battery energy management method of embodiments of the present application may be performed by integrated logic circuitry of hardware or instructions in software form in the processor 620.
The processor 620 may also be a general purpose processor, a digital signal processor (DIGITAL SIGNAL processing, DSP), an ASIC, an off-the-shelf programmable gate array (field programmable GATE ARRAY, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 610, and the processor 620 reads information in the memory 610, and in combination with hardware thereof, performs functions required to be performed by units included in the battery management system 600 of the embodiment of the present application, or performs a battery energy management method of the embodiment of the present application.
The communication interface 630 enables communication between the battery management system 600 and other devices or communication networks using a transceiver device such as, but not limited to, a transceiver.
Bus 640 may include a path for transferring information among the various components of battery management system 600 (e.g., memory 610, processor 620, communication interface 630).
It should be noted that although the above-described battery management system 600 only shows a memory, a processor, and a communication interface, those skilled in the art will appreciate that in a particular implementation, the battery management system 600 may also include other devices necessary to achieve proper operation. Also, it will be appreciated by those skilled in the art that the battery management system 600 may also include hardware devices that perform other additional functions, as desired. Furthermore, it will be appreciated by those skilled in the art that the battery management system 600 may also include only the components necessary to implement embodiments of the present application, and not necessarily all of the components shown in FIG. 6.
As shown in fig. 7, an embodiment of the present application further provides an electrical device 700, where the electrical device 700 includes a first load 710, a second load 720, and a battery system 730, where the battery system 730 is connected to the first load 710 and is configured to provide a first direct current to the first load 710, and/or the battery system 730 is connected to the second load 720 and is configured to provide a second direct current to the second load 720, and a voltage of the first direct current is greater than a voltage threshold, and a voltage of the second direct current is less than the voltage threshold.
That is, the first load 710 is a high voltage load, the second load 720 is a low voltage load, the battery system 730 supplies low voltage power to the first load 710, and supplies high voltage power to the second load 720.
The battery system 730 may include, for example, the battery system 500 described above, and the power consumption device 700 may be an electric vehicle.
The embodiments of the present application also provide a computer readable storage medium storing a computer program for executing the methods of the various embodiments of the present application described above.
The computer readable storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
The present application also provides a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described battery energy management method.
While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
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