CN115912559B - Control method of battery system, energy storage device and battery system - Google Patents
Control method of battery system, energy storage device and battery systemInfo
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- CN115912559B CN115912559B CN202211521490.0A CN202211521490A CN115912559B CN 115912559 B CN115912559 B CN 115912559B CN 202211521490 A CN202211521490 A CN 202211521490A CN 115912559 B CN115912559 B CN 115912559B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
本申请公开了一种电池系统的控制方法、储能设备和电池系统，该方法包括：获取电池系统中的各电池包的参数信息，参数信息包括电池容量与荷电状态；当检测到放电指令时，基于电池系统的放电功率以及电池系统中各电池包的电池容量与荷电状态，确定待放电的目标电池包；控制目标电池包进行放电。通过根据电池系统的放电功率、电池容量以及荷电状态共同确定合适的目标电池包进行放电，可以在一定程度上降低出现过流和互充的可能性，有效避免电池包频繁出现过流、互充等异常状况。
This application discloses a battery system control method, energy storage device, and battery system. The method comprises: obtaining parameter information of each battery pack in the battery system, including battery capacity and state of charge; when a discharge command is detected, determining a target battery pack to be discharged based on the battery system's discharge power and the battery capacity and state of charge of each battery pack in the battery system; and controlling the target battery pack to discharge. By jointly determining an appropriate target battery pack for discharge based on the battery system's discharge power, battery capacity, and state of charge, the likelihood of overcurrent and cross-charging can be reduced to a certain extent, effectively preventing abnormal battery pack conditions such as frequent overcurrent and cross-charging.
Description
Technical Field
The present application relates to the field of batteries, and in particular, to a control method of a battery system, an energy storage device, and a battery system.
Background
In order to improve the cruising ability of the energy storage device, it is usually implemented by connecting a plurality of battery packs in parallel. However, when a plurality of battery packs are connected in parallel, if the plurality of battery packs are simply controlled to discharge simultaneously, problems such as overcurrent and mutual charge are easy to occur, and the normal operation of the battery packs is affected.
Therefore, in a scenario where a plurality of battery packs are connected in parallel, how to control the discharge of the battery packs to avoid the occurrence of an abnormality in the battery packs is a problem to be solved.
Disclosure of Invention
The application provides a control method of a battery system, energy storage equipment and the battery system, and the method and the device can reduce the possibility of overcurrent and mutual charge to a certain extent and effectively avoid the abnormal conditions of frequent overcurrent, mutual charge and the like of the battery pack by jointly determining a proper target battery pack for discharging according to the discharge power, the battery capacity and the charge state of the battery system.
In a first aspect, the present application provides a control method of a battery system, applied to a master control battery pack in the battery system, where the battery system includes at least two battery packs, the method includes:
the method comprises the steps of obtaining parameter information of each battery pack in a battery system, determining a target battery pack to be discharged based on discharge power of the battery system and the battery capacity and the state of charge of each battery pack in the battery system when a discharge instruction is detected, and controlling the target battery pack to discharge.
In a second aspect, the present application also provides an energy storage device comprising a battery pack, a memory, and a processor;
the memory is used for storing a computer program;
the processor is configured to implement the control method of the battery system as described above when executing the computer program.
In a third aspect, the present application also provides a battery system comprising at least two battery packs and a processor;
The processor is used for realizing the control method of the battery system.
The application discloses a control method of a battery system, energy storage equipment and the battery system, wherein the battery capacity and the charge state of each battery pack can be obtained by acquiring parameter information of each battery pack in the battery system, when a discharging instruction is detected, a target battery pack to be discharged is determined based on the discharging power of the battery system and the battery capacity and the charge state of each battery pack in the battery system, and the target battery pack is controlled to discharge, so that the proper target battery pack is determined together according to the discharging power, the battery capacity and the charge state of the battery system to discharge, the possibility of overcurrent and mutual charge is reduced to a certain extent, and the abnormal conditions of frequent overcurrent, mutual charge and the like of the battery packs are effectively avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a battery system according to an embodiment of the present application;
Fig. 2 is a schematic structural diagram of an energy storage device according to an embodiment of the present application;
Fig. 3 is a schematic flowchart of a control method of a battery system according to an embodiment of the present application;
fig. 4 is a schematic view of a battery pack according to an embodiment of the present application;
FIG. 5 is a schematic flow chart of sub-steps for determining a target battery pack provided by an embodiment of the present application;
Fig. 6 is a schematic flow chart of sub-steps of another control method of a battery system provided by an embodiment of the present application;
Fig. 7 is a schematic flowchart of sub-steps of another control method of a battery system provided by an embodiment of the present application;
Fig. 8 is a schematic flow chart of sub-steps of another control method of a battery system provided by an embodiment of the present application;
fig. 9 is a schematic diagram of charging a battery pack according to an embodiment of the present application;
Fig. 10 is a schematic flowchart of sub-steps of another control method of a battery system provided in an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the 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.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
It is to be understood that the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
The embodiment of the application provides a control method of a battery system, energy storage equipment and the battery system. The control method of the battery system can be applied to a main control battery pack in the battery system, and by determining a proper target battery pack together according to the discharging power, the battery capacity and the charge state of the battery system to discharge, the possibility of overcurrent and mutual charge can be reduced to a certain extent, and abnormal conditions such as frequent overcurrent and mutual charge of the battery pack can be effectively avoided.
Referring to fig. 1, fig. 1 is a schematic diagram of a battery system according to an embodiment of the application. As shown in fig. 1, the battery system comprises at least two parallel battery packs, wherein the at least two battery packs comprise a main control battery pack, and each battery pack comprises an electric core and a switching tube for controlling charging and discharging. The switching transistors may be field-effect transistors (MOS transistors), transistors, or other types of switching transistors, such as discharge MOS transistors and charge MOS transistors shown in fig. 1. The battery system may further include a load resistor R1, a battery port capacitor C1, and an inverter. The two ends of the load resistor R1 and the battery port capacitor C1 are connected with the positive electrode wire and the negative electrode wire, and the inverter can be connected with external power supply equipment or electric equipment. For example, during charging, the inverter may be connected to a PV (Photo Voltaic ) panel.
For example, a battery pack in a battery system may be disposed in one or more energy storage devices. The energy storage device may be a mobile energy storage device, a home energy storage device, or a vehicle-mounted energy storage device. Wherein the energy storage device may be provided with at least one battery pack. For example, a master battery pack or a slave battery pack may be provided in the energy storage device. For another example, a master battery pack and at least one slave battery pack may be provided in the energy storage device. Each battery pack is connected with a plurality of battery cores in series.
In the embodiment of the application, the battery pack in the battery system can be controlled to charge and discharge. For example, the battery pack may be charged by a power supply device such as a photovoltaic charging source (e.g., PV panel in fig. 1), an ac charging source, or the like. For another example, the external powered device may be discharged through a battery pack in the battery system.
In some embodiments, when discharging the battery packs in the battery system, the master battery pack may obtain parameter information of each battery pack in the battery system, where the parameter information may include a battery capacity and a state of charge. When a discharging instruction is detected, the main control battery pack determines a target battery pack to be discharged based on the discharging power of the battery system and the battery capacity and the charge state of each battery pack in the battery system, and controls the target battery pack to discharge.
In the control method of the battery system provided by the application, the master control battery pack does not simply control all battery packs in the battery system to discharge, but selects a proper target battery pack to discharge based on the discharge power of the battery system and the battery capacity and charge state of each battery pack in the battery system.
It will be appreciated that in the case of a larger discharge power, if a battery pack with a smaller battery capacity is selected for discharge, the battery pack is liable to trigger the overcurrent protection. And, if the battery packs having large differences in charge states are selected to be discharged together, a situation in which the battery packs are charged each other is liable to occur. Therefore, in the method provided by the application, the proper target battery pack is selected to discharge based on the discharge power of the battery system and the battery capacity and the charge state of each battery pack in the battery system, so that the possibility of overcurrent and mutual charge can be reduced to a certain extent, the abnormal conditions such as overcurrent and mutual charge are avoided frequently, and the use experience of a user is improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an energy storage device 1000 according to an embodiment of the application. The energy storage device 1000 may include a processor 1001, a memory 1002, and a battery pack 1003, wherein the processor 1001 and the memory 1002, the battery pack 1003 may be connected by a bus, such as any suitable bus, for example, an I2C (Inter-INTEGRATED CIRCUIT) bus.
The memory 1002 may include a storage medium and an internal memory, among others. The storage medium may store an operating system and a computer program. The computer program comprises program instructions that, when executed, cause the processor to perform any of the control methods of the battery system.
Wherein the processor 1001 is configured to provide computing and control capabilities to support the operation of the overall energy storage device 1000.
The Processor 1001 may be a central processing unit (Central Processing Unit, CPU), which may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Wherein in one embodiment, the processor 1001 is configured to execute a computer program stored in the memory 1002 to implement the following steps:
the method comprises the steps of obtaining parameter information of each battery pack in a battery system, determining a target battery pack to be discharged based on discharge power of the battery system and the battery capacity and the state of charge of each battery pack in the battery system when a discharge instruction is detected, and controlling the target battery pack to discharge.
In one embodiment, the processor 1001 is configured to, when implementing determining a target battery pack to be discharged based on the discharge power of the battery system and the battery capacity and the state of charge of each battery pack in the battery system, implement:
If the battery capacities of the battery packs in the battery system are different, and the discharge power of the battery system is greater than or equal to a first discharge power threshold, determining the battery pack with the largest battery capacity as the target battery pack; and if the battery capacities of the battery packs in the battery system are different and the discharge power is smaller than the first discharge power threshold value, determining the battery pack with the largest charge state as the target battery pack.
In one embodiment, after the determining that the battery pack with the largest battery capacity is the target battery pack, the processor 1001 is configured to, after performing the determining that the target battery pack is discharged, perform:
and when the discharge power of the battery system is detected to be smaller than a second discharge power threshold, controlling the battery pack with the largest charge state to discharge, wherein the second discharge power threshold is smaller than the first discharge power threshold.
In one embodiment, the processor 1001 is configured to, when implementing determining a target battery pack to be discharged based on the discharge power of the battery system and the battery capacity and the state of charge of each battery pack in the battery system, implement:
And if the battery capacities of the battery packs in the battery system are the same and the charge states are the same, determining all the battery packs in the battery system as the target battery pack.
In one embodiment, the processor 1001 is configured to, after the determining all the battery packs in the battery system as the target battery packs, control the target battery packs to discharge, perform:
And if the discharge power is smaller than a first discharge power threshold value, controlling all battery packs in the battery system to discharge.
In one embodiment, the processor 100 is further configured to implement:
And when the charging instruction is detected, determining the battery pack with the minimum charge state in the battery system as a rechargeable battery pack, and charging the rechargeable battery pack.
In one embodiment, the processor 1001, when implementing charging the rechargeable battery pack, is configured to implement:
and when the total required power value is larger than the maximum output power of power supply equipment connected with the battery system, charging the rechargeable battery pack based on the maximum output power.
In addition, in other possible battery systems, the battery system may include a power conversion device and at least two battery packs, and the power conversion device is connected to the at least two battery packs, respectively. The power conversion device is provided with a processor, and the processor can implement the control method provided by the embodiment of the application to control the battery pack in the battery system.
It should be understood that the foregoing is merely illustrative of the battery system according to the embodiments of the present application, and in a practical application scenario, the battery system implementing the control method provided by the present application may be composed of more or fewer devices, or replace some of the devices therein, which is not limited by the present application.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 3, the control method of the battery system includes steps S101 to S103.
Step S101, obtaining parameter information of each battery pack in the battery system, where the parameter information includes a battery capacity and a state of charge.
For example, parameter information of each battery pack in the battery system may be read. For example, parameter information of each Battery pack in the Battery system may be read by a Battery management system (Battery MANAGEMENT SYSTEM, BMS).
The parameter information may include a battery capacity and a State of Charge (SOC), among others. It is understood that the above battery capacity refers to the capacity of the battery pack in a full state, and the state of charge refers to the percentage of the remaining capacity of the battery pack to the above battery capacity.
Referring to fig. 4, fig. 4 is a schematic diagram of a battery pack according to an embodiment of the application. In one possible scenario, as shown in fig. 4, the battery system may include a battery pack 1, a battery pack 2, and a battery pack 3. The battery pack 1 had a battery capacity of 5kWh and a state of charge of 30%, the battery pack 2 had a battery capacity of 2kWh and a state of charge of 70%, and the battery pack 3 had a battery capacity of 2kWh and a state of charge of 50%.
For example, the state of charge of the battery pack may be calculated using an open circuit voltage method or an ampere-hour integration method. The open circuit voltage method is to use a relatively fixed functional relationship between the open circuit voltage and the state of charge of the battery pack under the condition of standing for a long time, so that the state of charge can be estimated according to the open circuit voltage. The ampere-hour integration method is to calculate the percentage of the changing electric quantity (namely the changing state of charge) by calculating the integration of the charge-discharge current and the corresponding time within a certain time, and finally calculate the difference between the initial state of charge and the changing state of charge, namely the current state of charge.
In the above embodiments, by acquiring the parameter information of each battery pack in the battery system, the battery capacity and the state of charge of each battery pack can be obtained.
Step S102, when a discharging instruction is detected, determining a target battery pack to be discharged based on the discharging power of the battery system and the battery capacity and the state of charge of each battery pack in the battery system.
In the embodiment of the application, when the external electric equipment is detected to be connected to the energy storage equipment, a discharging instruction is generated, and the battery pack in the battery system is controlled to discharge according to the discharging instruction.
In some embodiments, when a discharge command is detected, a target battery pack to be discharged is determined based on the discharge power of the battery system and the battery capacity and state of charge of each battery pack in the battery system.
The discharge power of the battery system is the power output from the battery system to the outside, and is determined by the power required on the load side. Illustratively, a load connected to the battery system may send the required power of the load to a master battery pack, and the master battery pack may sum the required powers of the loads to obtain the discharge power of the battery system.
The discharge power of the battery system in which the respective battery packs are connected in parallel may be superimposed. For example, when a plurality of battery packs are discharged simultaneously, the discharge power of the battery system is the sum of the discharge powers of the battery packs.
It is understood that the discharge power of each battery pack is positively correlated with the discharge current. In order to ensure the safety of the battery packs, an overcurrent protection threshold is set for each battery pack, and when the discharge current of the battery pack is greater than the overcurrent protection threshold, overcurrent protection is triggered. The overcurrent protection threshold may be set according to the battery capacity, for example, in general, the overcurrent protection threshold corresponding to a battery pack having a large battery capacity is large, and the overcurrent protection threshold corresponding to a battery pack having a small battery capacity is small. Therefore, when the discharging power of the battery system is larger, the battery pack with large battery capacity is preferentially controlled to discharge, so that the possibility that the battery pack with small battery capacity triggers over-current protection can be effectively reduced. When the discharge power of the battery system is small, it may be considered that the battery pack having a large state of charge is controlled to be discharged in order to ensure the efficiency of the discharge.
In the above embodiment, by determining the target battery pack to be discharged based on the discharge power of the battery system and the battery capacity and state of charge of each battery pack in the battery system, it is possible to determine the appropriate target battery pack in accordance with the discharge power, the battery capacity, and the state of charge of the battery system.
And step S103, controlling the target battery pack to discharge.
In the embodiment of the application, after the target battery pack to be discharged is determined, the target battery pack can be controlled to be discharged.
The control instruction may be sent to a discharge switch tube corresponding to the target battery pack, and the discharge switch tube conducts connection between the target battery pack and external electric equipment according to the control instruction, so that the target battery pack discharges the external electric equipment.
The switching tube may be a MOS tube, for example. For example, if the target battery pack is the battery pack 1, a control instruction may be sent to a discharge MOS tube corresponding to the battery pack 1, and the discharge MOS tube conducts connection between the battery pack 1 and external electric equipment according to the control instruction.
When the discharge MOS transistor is turned on, since the charge MOS transistor connected in series with the discharge MOS transistor is not turned on, a current may flow through the body diode of the charge MOS transistor. When the current is large, for example, the current is larger than a preset current threshold, in order to avoid damaging the charging MOS tube, the charging MOS tube can be controlled to be conducted. The preset current threshold may be set according to an operating parameter of the body diode, and specific values are not limited herein.
In the above embodiment, by controlling the target battery pack to discharge, it is avoided to simply control all the battery packs in the battery system to discharge, so that the possibility of overcurrent and mutual charge can be reduced to a certain extent, and abnormal conditions such as frequent overcurrent and mutual charge of the battery packs can be effectively avoided.
In the embodiment of the present application, a detailed description will be given of how to determine a target battery pack to be discharged.
Referring to fig. 5, fig. 5 is a schematic flowchart of a sub-step of determining a target battery pack according to an embodiment of the present application, and in step S102, determining the target battery pack to be discharged may include the following steps S201 to S204.
Step S201, if the battery capacities of the battery packs in the battery system are different, and the discharge power of the battery system is greater than or equal to the first discharge power threshold, determining the battery pack with the largest battery capacity as the target battery pack.
In the embodiment of the present application, the target battery pack to be discharged may be determined together according to the discharge power of the battery system, the battery capacity and the state of charge of each battery pack. By way of example, it may be determined whether the discharge power of the battery system is greater than a first discharge power threshold, whether the battery capacities of the respective battery packs are the same, whether the states of charge of the respective battery packs are the same, and so on.
When the battery capacities of the battery packs in the battery system are different, and the discharge power of the battery system is equal to or greater than the first discharge power threshold, the battery pack having the largest battery capacity is determined as the target battery pack.
As shown in fig. 4, the battery pack 1 has a battery capacity of 5kWh, the battery pack 2 has a battery capacity of 2kWh, and the battery pack 3 has a battery capacity of 2kWh, where the battery pack 1 is the battery pack with the largest battery capacity in the battery system, and the battery pack 1 may be determined as the target battery pack.
The first discharge power threshold may be set according to the discharge power of the battery pack having the smallest battery capacity, and the specific value is not limited herein. It can be understood that the battery pack with large battery capacity has a larger overcurrent protection threshold and the battery pack with small battery capacity has a smaller overcurrent protection threshold, and when the discharge power of the battery system is greater than or equal to the first discharge power threshold, a larger impact current is generated at the moment of load connection, and the impact current may exceed the overcurrent protection threshold corresponding to the battery pack with small battery capacity, so that the battery pack triggers the overcurrent protection to stop discharging. Therefore, when the discharge power of the battery system is greater than or equal to the first discharge power threshold, the battery pack with the largest battery capacity is preferentially used for discharging, and the possibility that the battery pack triggers over-current protection can be reduced.
In the above embodiment, when the battery capacities of the battery packs in the battery system are different and the discharge power of the battery system is greater than or equal to the first discharge power threshold, the battery pack with the largest battery capacity is determined as the target battery pack, and the battery pack with the large battery capacity can bear larger impact current, so that the possibility of triggering over-current protection of the battery pack can be reduced.
Step S202, if the battery capacities of the battery packs in the battery system are different and the discharge power is smaller than the first discharge power threshold, determining the battery pack with the largest charge state as the target battery pack.
For example, when the battery capacities of the battery packs in the battery system are different and the discharge power of the battery system is smaller than the first discharge power threshold, the battery pack having the largest state of charge is determined as the target battery pack.
For example, as shown in fig. 5, the state of charge of the battery pack 1 is 30%, the state of charge of the battery pack 2 is 70%, and the state of charge of the battery pack 3 is 50%. The battery pack 2 is the battery pack with the largest state of charge in the battery system, and the battery pack 2 may be determined as the target battery pack.
When the discharge power of the battery system is smaller than the first discharge power threshold, the battery pack does not trigger the over-current protection, but in order to ensure the discharge efficiency of the battery system, it is necessary to use a battery pack with a larger state of charge for discharging. In addition, in the situation, the battery pack with the largest charge state is used for discharging, so that the charge states of the battery packs tend to be the same, and the battery packs can be conveniently combined to provide larger discharge power.
In the above embodiment, when the battery capacities of the battery packs in the battery system are different and the discharge power is smaller than the first discharge power threshold, the battery pack having the largest state of charge is determined as the target battery pack, so that the discharge efficiency of the battery system can be ensured.
Step S203, if the battery capacities of the battery packs in the battery system are the same and the states of charge are different, determining the battery pack with the largest state of charge as the target battery pack.
When the battery capacities of the battery packs in the battery system are the same, the capacities of the battery packs to withstand the rush current are the same, and therefore, the magnitude relation between the discharge power of the battery system and the first discharge power threshold value is not required to be considered.
For example, when the battery capacities of the respective battery packs in the battery system are the same and the states of charge are different, the battery pack having the largest state of charge is determined as the target battery pack.
In the above embodiment, when the battery capacities of the battery packs are the same and the states of charge are different in the battery system, the battery pack with the largest state of charge is determined as the target battery pack, so that the condition that the battery packs are mutually charged easily due to the common discharge of a plurality of batteries with large differences in the states of charge can be avoided.
Step S204, if the battery capacities and the states of charge of the battery packs in the battery system are the same, determining all the battery packs in the battery system as the target battery pack.
For example, when the battery capacities of the battery packs in the battery system are the same and the states of charge are the same, all the battery packs in the battery system are determined as the target battery pack.
It should be noted that, since the states of charge of the respective battery packs are the same, there is no possibility that mutual charging occurs between the different battery packs.
In the above embodiment, when the battery capacities of the battery packs in the battery system are the same and the states of charge are the same, the discharge efficiency of the battery system can be effectively improved by determining all the battery packs in the battery system as the target battery pack.
In the embodiment of the application, after the target battery pack to be discharged is determined, the target battery pack can be controlled to be discharged.
Referring to fig. 6, fig. 6 is a schematic flowchart of sub-steps of another control method of a battery system according to an embodiment of the present application, which may include the following steps S301 to S304.
Step S301, obtaining parameter information of each battery pack in the battery system, where the parameter information includes a battery capacity and a state of charge.
It is understood that the step S301 is the same as the step S101, and will not be described herein.
And step S302, when a discharge instruction is detected, if the battery capacities of the battery packs in the battery system are different, and the discharge power of the battery system is greater than or equal to a first discharge power threshold value, determining the battery pack with the largest battery capacity as the target battery pack.
It is understood that the step S302 is the same as the step S201, and will not be repeated here.
And step S303, controlling the target battery pack to discharge.
It is understood that the step S303 is the same as the step S103, and will not be described herein.
And step S304, when the discharge power of the battery system is detected to be smaller than a second discharge power threshold, controlling the battery pack with the largest charge state to discharge, wherein the second discharge power threshold is smaller than the first discharge power threshold.
Illustratively, the battery pack having the largest state of charge is controlled to discharge when the discharge power of the battery system is detected to be less than the second discharge power threshold. Wherein the second discharge power threshold is less than the first discharge power threshold. The second discharge power threshold may be set according to practical situations, and specific values are not limited herein.
For example, the first discharge power threshold may be 3000W, the second discharge power threshold may be 1400W, and when the discharge power of the battery system is greater than or equal to 3000W, the battery pack with the largest battery capacity is controlled to discharge, and when the discharge power of the battery system is less than 1400W, the battery pack with the largest state of charge is controlled to discharge.
In the process of controlling the discharge of the battery pack having the maximum battery capacity, the discharge power of the battery system may be changed according to the change of the load, for example, the discharge function of the battery system may be increased or decreased. When the discharge power of the battery system is smaller than the first discharge power threshold, the battery pack with the highest charge state can be selected to be discharged. However, in order to avoid frequent switching of discharged battery packs around the first discharge power threshold due to the discharge power jitter, a second discharge power threshold may be set, which is smaller than the first discharge power threshold. When the discharging power of the battery system is smaller than the second discharging power threshold, the battery pack with the largest charge state is controlled to discharge, and the discharging efficiency is improved. Subsequently, when the discharge power is greater than or equal to the first discharge power threshold, the battery pack with the maximum battery capacity can be switched to discharge again, so that the overcurrent condition is avoided.
For example, assume that the first discharge power threshold is 3000W and the second discharge power threshold is 1400W. When the discharge power of the battery system is less than 1400W, the battery pack with the largest state of charge may be automatically switched to discharge in order to ensure the discharge efficiency of the battery system and to avoid the power consumption of the individual battery packs. Subsequently, when the discharge power of the battery system is 3000W or more, the battery pack having the largest battery capacity is switched to discharge.
In the above embodiment, after the battery pack with the largest battery capacity is controlled to discharge, when the discharge power of the battery system is detected to be smaller than the second discharge power threshold, the battery pack with the largest charge state is controlled to discharge, so that larger discharge power can be output, the discharge efficiency of the battery system is ensured, and the electric quantity and the light consumption of the single battery pack are avoided.
Referring to fig. 7, fig. 7 is a schematic flowchart of sub-steps of another control method of a battery system according to an embodiment of the present application, which may include the following steps S401 to S403.
Step S401, acquiring parameter information of each battery pack in the battery system, where the parameter information includes a battery capacity and a state of charge.
It is understood that the step S301 is the same as the step S101, and will not be described herein.
And step S402, when a discharging instruction is detected, if the battery capacity and the charge state of each battery pack in the battery system are the same, determining all the battery packs in the battery system as the target battery packs.
It is understood that the step S402 is the same as the step S204, and will not be repeated here.
And step S403, if the discharge power is smaller than the first discharge power threshold, controlling all battery packs in the battery system to discharge.
For example, a current discharge power of the discharge system may be detected, and when the discharge power is less than a first discharge power threshold, all battery packs in the battery system are controlled to discharge.
When the battery system is discharged, if the discharge power of the battery system is greater than or equal to the first discharge power threshold, the impact current generated at the moment of load access may exceed the corresponding overcurrent protection threshold of each battery pack, thereby causing each battery pack to trigger overcurrent protection and stop discharging. Therefore, in order to ensure that the battery packs can be normally discharged, it is necessary to control all the battery packs in the battery system to be discharged when the discharge power is smaller than the first discharge power threshold value.
In the above embodiment, by controlling all the battery packs in the battery system to discharge when the discharge power is smaller than the first discharge power threshold, the possibility that the battery packs trigger the overcurrent protection can be reduced.
In the embodiment of the present application, the battery pack may be controlled to be charged in addition to being discharged. The following will describe in detail how to control the charging of the battery pack.
Referring to fig. 8, fig. 8 is a schematic flowchart of sub-steps of another control method of a battery system according to an embodiment of the present application, which may include the following steps S501 to S503.
Step S501, obtaining parameter information of each battery pack in the battery system, where the parameter information includes a battery capacity and a state of charge.
It is understood that the step S501 is the same as the step S101, and will not be described herein.
And step S502, when a charging instruction is detected, determining the battery pack with the minimum state of charge in the battery system as a charging battery pack.
In some embodiments, when a charging instruction is detected, a battery pack having the smallest state of charge in the battery system is determined as a charging battery pack.
In the embodiment of the application, when the power supply equipment is detected to be connected to the energy storage equipment, a charging instruction is generated, a battery pack with the minimum charge state in the battery system is determined to be a rechargeable battery pack, and the rechargeable battery pack in the battery system is controlled to be charged according to the charging instruction.
Referring to fig. 9, fig. 9 is a schematic diagram illustrating a battery pack charging according to an embodiment of the application. As shown in fig. 9, for battery pack 1, battery pack 2, and battery pack 3. When charging is started, the state of charge of the battery pack 1 is the largest, the state of charge of the battery pack 3 is the smallest, and the battery pack 3 may be determined as a rechargeable battery pack. When the charge state of the battery pack 3 is the same as the charge state of the battery pack 2, the battery pack 2 and the battery pack 3 are determined as charging battery packs, and when the charge state of the battery pack 2 and the battery pack 3 is the same as the charge state of the battery pack 1, the battery pack 2 and the battery pack 3 are determined as charging battery packs.
It should be noted that, by determining the battery pack with the smallest charge state in the battery system as the rechargeable battery pack, the battery pack with the largest charge state can be charged preferentially, so as to avoid the abnormal situation of mutual charging between the battery packs with different charge states caused by simultaneously controlling the battery packs with different charge states to charge.
Step S503, charging the rechargeable battery pack.
For example, the control instruction may be sent to a charging switch tube corresponding to the rechargeable battery pack, and the charging switch tube conducts connection between the rechargeable battery pack and the power supply device according to the control instruction, so that the power supply device charges the rechargeable battery pack. The power supply equipment can be photovoltaic charging power supply, alternating current charging power supply and other equipment. The switching tube may be a MOS tube.
For example, if the rechargeable battery pack is the battery pack 3, a control command may be sent to the charging MOS tube corresponding to the battery pack 3, and the charging MOS tube may conduct connection between the battery pack 3 and the power supply device according to the control command.
When the charging MOS transistor is turned on, since the discharging MOS transistor connected in series with the charging MOS transistor is not turned on, a current may flow through the body diode of the discharging MOS transistor. When the current is large, for example, the current is larger than a preset current threshold, the discharge MOS tube can be controlled to be conducted in order to avoid damaging the discharge MOS tube. The preset current threshold may be set according to an operating parameter of the body diode, and specific values are not limited herein.
According to the embodiment, the battery pack with the minimum charge state in the battery system is determined to be the rechargeable battery pack, and the rechargeable battery pack is charged, so that the battery packs with different charge states are prevented from being charged at the same time, and the possibility of mutual charging among the battery packs with different charge states is reduced.
Referring to fig. 10, fig. 10 is a schematic flowchart of the substeps of another control method of a battery system according to an embodiment of the present application, which may include the following steps S601 to S604.
Step S601, obtaining parameter information of each battery pack in the battery system, where the parameter information includes a battery capacity and a state of charge.
It is understood that the step S601 is the same as the step S101, and will not be repeated here.
And step S602, when a charging instruction is detected, determining the battery pack with the minimum state of charge in the battery system as a charging battery pack.
It is understood that the step S602 is the same as the step S502, and will not be repeated here.
Step S603, determining a total required power value of the rechargeable battery packs, where the total required power value is a sum of required powers of the rechargeable battery packs.
The required power of each rechargeable battery pack can be read, and then the required power of each rechargeable battery pack is added to obtain the total required power value of the rechargeable battery packs. The required power is the power required by the rechargeable battery pack during charging.
For example, when the rechargeable battery pack is the battery pack 1, the total value of the required power of the rechargeable battery pack is the required power of the battery pack 1. For another example, when the rechargeable battery packs are the battery pack 1 and the battery pack 2, the total power demand of the rechargeable battery packs is the sum of the power demands of the battery pack 1 and the battery pack 2.
And step S604, when the total value of the required power is larger than the maximum output power of the power supply equipment connected with the battery system, charging the rechargeable battery pack based on the maximum output power.
The maximum output power of the power supply apparatus is determined by the operating parameters of the power supply apparatus, and specific values are not limited herein.
For example, when the required power total value is greater than the maximum output power of the power supply device connected to the battery system, the rechargeable battery pack is charged based on the maximum output power. And when the total value of the required power is less than or equal to the maximum output power of the power supply equipment, charging the rechargeable battery pack based on the total value of the required power.
For example, when the maximum output power of the power supply apparatus is 5500W, the required power of the battery pack 1 is 4400W, the required power of the battery pack 2 is 1700W, and the required power of the battery pack 3 is 1700W, if the rechargeable battery pack is the battery pack 3, and the total required power value is 1700W at this time, the battery pack 3 can be charged based on the charging power of 1700W. For example, if the rechargeable battery packs are the battery pack 2 and the battery pack 3, and the total required power value is 3400W, the battery pack 2 and the battery pack 3 may be charged based on the charge power of 3400W. For another example, if the rechargeable battery packs are the battery pack 1, the battery pack 2, and the battery pack 3, and the total required power value is 7800W at this time and is larger than the maximum output power 5500W of the power supply device, the battery pack 1, the battery pack 2, and the battery pack 3 may be charged based on the charging power of 5500W.
According to the embodiment, the total required power value of the rechargeable battery pack is determined, so that the rechargeable battery pack can be charged based on the maximum output power when the total required power value is larger than the maximum output power of the power supply equipment, and overload operation of the power supply equipment is avoided while high charging efficiency is ensured.
The embodiment of the application also provides a computer readable storage medium, and the computer readable storage medium stores a computer program, the computer program includes program instructions, and a processor executes the program instructions to implement the control method of any battery system provided by the embodiment of the application.
For example, the program is loaded by a processor, and the following steps may be performed:
the method comprises the steps of obtaining parameter information of each battery pack in a battery system, determining a target battery pack to be discharged based on discharge power of the battery system and the battery capacity and the state of charge of each battery pack in the battery system when a discharge instruction is detected, and controlling the target battery pack to discharge.
The computer readable storage medium may be an internal storage unit of the energy storage device according to the foregoing embodiment, for example, a hard disk or a memory of the energy storage device. The computer readable storage medium may also be an external storage device of the energy storage device, such as a plug-in hard disk, a smart memory Card (SMART MEDIA CARD, SMC), a Secure digital Card (Secure DIGITAL CARD, SD Card), a flash memory Card (FLASH CARD), etc. that are provided on the energy storage device.
Further, the computer-readable storage medium may mainly include a storage program area that may store an operating system, programs required for at least one function, and the like, and a storage data area that may store data created according to each program, and the like.
While the application has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (8)
1. A control method of a battery system, characterized by being applied to a master battery pack in the battery system, the battery system including at least two battery packs, the method comprising:
acquiring parameter information of each battery pack in the battery system, wherein the parameter information comprises battery capacity and state of charge;
When a discharge instruction is detected, if the battery capacities of the battery packs in the battery system are different, and the discharge power of the battery system is greater than or equal to a first discharge power threshold value, determining the battery pack with the largest battery capacity as a target battery pack to be discharged;
if the battery capacities of the battery packs in the battery system are different and the discharge power is smaller than the first discharge power threshold, determining the battery pack with the largest charge state as the target battery pack;
Controlling the target battery pack to discharge;
and when the discharge power of the battery system is detected to be smaller than a second discharge power threshold, controlling the battery pack with the largest charge state to discharge, wherein the second discharge power threshold is smaller than the first discharge power threshold.
2. The control method of the battery system according to claim 1, wherein the determining the target battery pack to be discharged based on the discharge power of the battery system and the battery capacity and the state of charge of each of the battery packs in the battery system includes:
If the battery capacity of each battery pack in the battery system is the same and the charge states are different, determining the battery pack with the largest charge state as the target battery pack;
And if the battery capacity and the charge state of each battery pack in the battery system are the same, determining all the battery packs in the battery system as the target battery packs.
3. The control method of the battery system according to claim 2, wherein after the determination of all the battery packs in the battery system as the target battery pack, the control of the target battery pack to discharge includes:
And if the discharge power is smaller than a first discharge power threshold value, controlling all battery packs in the battery system to discharge.
4. The control method of a battery system according to claim 1, characterized in that the method further comprises:
when a charging instruction is detected, determining a battery pack with the minimum state of charge in the battery system as a charging battery pack;
and charging the rechargeable battery pack.
5. The method of controlling a battery system according to claim 4, wherein the charging the rechargeable battery pack includes:
determining a total required power value of the rechargeable battery packs, wherein the total required power value is the sum of the required power of each rechargeable battery pack;
And when the total value of the required power is larger than the maximum output power of the power supply equipment connected with the battery system, charging the rechargeable battery pack based on the maximum output power.
6. An energy storage device comprising a battery pack, a memory, and a processor;
the memory is used for storing a computer program;
the processor is configured to implement the control method of the battery system according to any one of claims 1 to 5 when executing the computer program.
7. A battery system comprising at least two battery packs and a processor;
the processor is configured to implement the control method of the battery system according to any one of claims 1 to 5.
8. The battery system of claim 7, wherein the at least two battery packs comprise a main battery pack, the processor being integrated within the main battery pack, or
The battery system further comprises a power conversion device which is used for being connected with at least two battery packs respectively, and the processor is integrated on the power conversion device.
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| CN120016662B (en) * | 2025-04-18 | 2025-07-08 | 陕西省水务集团水处理设备有限公司 | Power supply system based on self-generating water meter |
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| CN115276175A (en) * | 2022-08-17 | 2022-11-01 | 珠海格力电器股份有限公司 | Control method and device for battery charging and discharging, electric vehicle and readable storage medium |
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| CN115208027A (en) * | 2022-08-04 | 2022-10-18 | 阳光新能源开发股份有限公司 | Energy balancing method, method and system for determining balancing coefficient and storage medium |
| CN115276175A (en) * | 2022-08-17 | 2022-11-01 | 珠海格力电器股份有限公司 | Control method and device for battery charging and discharging, electric vehicle and readable storage medium |
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