CN115799672A - Management method and device of battery pack and energy storage system - Google Patents
Management method and device of battery pack and energy storage system Download PDFInfo
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- 238000007726 management method Methods 0.000 title abstract description 60
- 238000000034 method Methods 0.000 claims description 39
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
-
- 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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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application provides a management method, a management device and an energy storage system of a battery pack, relates to the technical field of energy, and aims to solve the technical problem that in an energy storage device with a limited SOC (state of charge), the real and effective detection on SOH (state of charge) cannot be carried out. The management method of the battery pack provided by the application can comprise the following steps: detecting that the battery pack reaches a calibration condition, removing SOC limitation on the battery pack, fully charging and emptying the electric quantity of the battery pack to obtain the maximum discharge quantity of the battery pack, obtaining the rated capacity of the battery pack, calculating to obtain an SOH value based on the maximum discharge quantity and the rated capacity of the battery pack, updating the SOC limitation value of the battery pack according to the obtained SOH value, and starting SOC limitation on the battery pack. By applying the management method provided by the application, the limitation of the SOC can be removed as required to obtain the real and effective SOH value of the battery pack, so that the health state of the energy storage equipment can be effectively detected, and the energy storage equipment can be accurately and effectively managed.
Description
Technical Field
The application relates to the technical field of energy, in particular to a management method and device of a battery pack and an energy storage system.
Background
With the continuous development of green energy technology, energy storage devices capable of storing and releasing electric energy are widely applied to various different types of energy storage systems. For example, in a light storage system, a photovoltaic device and an energy storage device are generally included, a battery pack in the energy storage device can effectively store electric energy generated by the photovoltaic device, and the energy storage device can also provide the electric energy to an electric device when needed. In practical applications, the state of charge (SOC) of the battery pack is usually set so that the energy storage device can have a certain degree of electric energy storage capacity and can release enough electric energy.
In the long-term operation process of the energy storage device, the capacity of the battery pack is attenuated, and if the electric quantity of the battery pack is not fully charged or discharged for a long time, the state of health (SOH) of the battery pack cannot be really and effectively detected, so that the real health of the battery pack cannot be known, and the energy storage device cannot be accurately and effectively managed.
Disclosure of Invention
The application provides a management method and device of a battery pack and an energy storage system, and aims to solve the problem of poor management precision of the battery pack.
In a first aspect, the present application provides a method for managing a battery pack, which may include: and releasing the SOC limit of the battery pack after detecting that the battery pack reaches the calibration condition. And fully charging and emptying the electric quantity of the battery pack to obtain the maximum discharge quantity of the battery pack. And acquiring the rated capacity of the battery pack, and calculating to obtain the SOH value based on the maximum discharge capacity and the rated capacity of the battery pack. The real health degree of the battery pack can be known according to the obtained SOH value, so that the battery pack can be effectively managed in multiple aspects. For example, since the SOH value decreases after the battery pack is degraded, if the SOC is limited before the battery pack is used, data inaccuracy may occur. Therefore, after the SOH value of the battery pack is obtained, the SOC limit value can be recalculated based on the SOH value, so that the accuracy and the effectiveness of the SOC limit can be ensured. Alternatively, the obtained SOH value may be compared with a preset value, and when the obtained SOH value is less than the preset value, the charge and discharge function of the battery pack may be stopped. Wherein the preset value can be a recycling critical value of the battery pack. In summary, by applying the management method of the battery pack provided by the application, the limitation of the SOC can be removed as required to obtain the true and effective SOH value of the battery pack, and the battery pack can be accurately and effectively managed by the SOH value.
In a specific application, the calibration conditions may include: and the total charge and discharge amount of the battery pack reaches a preset value, or the preset time length is reached from the last calibration process of the battery pack. The preset value may be fixed or floating. For example, the preset value may be associated with an SOH value, so that a battery pack with a lower SOH value may be calibrated at a higher frequency, so as to improve the safety and stability of the energy storage device. Of course, the preset duration may also be associated with the SOH value, which is not described herein.
In one example, the SOH value may also be stored to facilitate retrieval of the SOH value.
In addition, in practical applications, a plurality of battery packs may be included in the energy storage device. If the SOH calibration process is not executed currently and the plurality of battery packs all reach the calibration condition. The last SOH values of the plurality of battery packs may be obtained, and the plurality of battery packs may be calibrated in sequence from small to large SOH values. Therefore, the SOH calibration can be preferentially carried out on the battery pack with the smaller SOH value, so that the use safety and the stability of the energy storage device can be ensured.
In addition, if the SOH calibration process has been currently performed on the battery packs and the plurality of battery packs all reach the calibration condition, the last SOH values of the plurality of battery packs may be obtained, and the plurality of battery packs may be sequentially calibrated according to the sequence of the SOH values from small to large. Therefore, the SOH calibration can be preferentially carried out on the battery pack with the smaller SOH value, so that the use safety and the stability of the energy storage device can be ensured.
In a second aspect, the present application also provides a management device for a battery pack, which may include a battery management unit and a battery control unit. The battery management unit is connected with a battery pack in the energy storage device and used for monitoring relevant parameters of the battery pack, such as current, voltage, temperature and the like, and transmitting the parameters to the battery control unit for control. The battery control unit is responsible for collecting the information of the battery management unit, and after relevant calculation and judgment are carried out, a control signal can be sent to the battery control unit so as to control the working state of the battery pack. Wherein, the working state of the battery pack may include: charge, discharge, turn on or off SOC limits, etc.
After the BMU detects that the battery pack has reached the calibration condition, a calibration procedure may be requested from the BCU. The BCU enables the BMU to remove SOC limitation on the battery pack based on the request calibration process, fully charges the electric quantity of the battery pack and empties the battery pack, so that the BMU can detect the maximum discharge capacity of the battery pack and calculate the SOH value based on the maximum discharge capacity and the rated capacity of the battery pack. And finally, the BCU can recalculate the SOC limit value according to the obtained SOH value and control the BMU to start the SOC limit on the battery pack so as to ensure the accuracy and effectiveness of the SOC limit. Alternatively, the obtained SOH value may be compared with a preset value, and when the obtained SOH value is smaller than the preset value, the charge and discharge function of the battery pack may be stopped.
And controlling the BMU to start the SOC limit of the battery pack.
In a specific application, the calibration condition may be that the total charge and discharge amount of the battery pack reaches a preset value. Alternatively, the preset time period may be reached from the last calibration procedure of the battery pack. Or, the total charge and discharge amount of the battery pack may reach a preset value, and the time from the last calibration process of the battery pack to the preset time may be included at the same time.
In one example, the management device of the battery pack may further include a battery management system. The battery control unit can be in communication connection with the battery management system and transmits the relevant parameters of the current, the voltage, the temperature and the like of the battery pack collected by the battery management unit to the battery management system. After the battery management system can perform relevant calculation and judgment, the battery control unit sends a control signal to the battery management unit so as to control the working state of the battery pack.
In one example, the battery control unit or the battery management system may also calculate and update the SOC limit value based on the SOH value in order to ensure the accuracy and effectiveness of the SOC limit.
In one example, the management device may further include a memory, and the memory may be connected to the battery control unit or the battery management system, and is configured to store parameters such as the SOH value.
In one example, the BMS is configured to obtain a last SOH value of each of the plurality of battery packs when each of the plurality of battery packs reaches the calibration condition, and sequentially calibrate the plurality of battery packs from a small SOH value to a large SOH value. Therefore, the SOH calibration can be preferentially carried out on the battery pack with the smaller SOH value, so that the use safety and the stability of the energy storage device can be ensured.
In a third aspect, the present application further provides an energy storage system, including an energy storage device and any one of the above battery pack management apparatuses, where the battery pack management apparatus can obtain a true state of health (SOH) of the battery pack, so as to ensure working stability and reliability of the energy storage device.
Drawings
Fig. 1 is a flowchart of a method for managing a battery pack according to an embodiment of the present disclosure;
fig. 2 is a flowchart of another management method for a battery pack according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a method for determining whether a battery pack has reached a calibration condition according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a management apparatus for a battery pack according to an embodiment of the present disclosure;
fig. 5 is a block diagram of an energy storage system according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.
For the convenience of understanding the management method of the battery pack provided in the embodiment of the present application, an application scenario thereof is first described below.
The management method of the battery pack can be applied to various different types of energy storage systems such as photovoltaic energy storage, wind power generation energy storage and tidal power generation energy storage.
For example, in a light storage system, a photovoltaic device and an energy storage device are typically included. The photovoltaic equipment is used for converting solar energy into electric energy, the energy storage equipment is connected with the photovoltaic equipment, the electric energy generated by the photovoltaic equipment can be effectively stored, and the energy storage equipment can also provide the electric energy for a power grid or electric equipment when needed. In practical applications, a state of charge (SOC) of the energy storage device is usually set so that the energy storage device can have a certain degree of electric energy storage capacity.
Specifically, the SOC is mainly used to reflect the remaining capacity of the battery, and is numerically defined as a ratio of the remaining capacity to the rated capacity, which is expressed by a percentage. When the SOC is equal to 0, it indicates that the remaining capacity is zero. When the SOC is equal to 100%, it indicates that the battery is in a full state.
Assuming that the SOC of the energy storage device is limited to 20% -80%, in a normal application scenario, when the energy storage device stores energy, and the electric quantity in the energy storage device reaches 80%, the electric energy is stopped from being stored continuously. When the energy storage device is temporarily called to store electricity, the energy storage device still has enough capacity to store electric energy, thereby having a certain degree of reserve capacity. When the energy storage device discharges, when the electric quantity in the energy storage device reaches 20%, the electric energy is stopped to be released. When the energy storage device is temporarily called to discharge, the energy storage device still has certain electric energy to release, so that the energy storage device has certain discharge capacity.
The energy storage device may include a plurality of battery packs connected in series and parallel, and the battery packs may be lithium batteries, lead-acid batteries, lithium-sulfur batteries, sodium batteries, magnesium batteries, aluminum batteries, potassium batteries, or the like. In the long-term operation process of the battery pack, the capacity of the battery pack is attenuated, and if the electric quantity of the battery pack is not fully charged or discharged for a long time, the state of health (SOH) of the battery pack or the whole energy storage device cannot be really and effectively detected, so that the real health of the energy storage device cannot be known. Where SOH refers to the current capacity of the battery (or battery pack) as a percentage of the rated capacity. Normally, the SOH value of a battery just before shipment is 100%, and after the battery decays, the SOH value may decrease to 95%, 90%, 88%, or the like, and generally, the SOH value decreases as the battery is used for a longer time.
Based on this, the embodiment of the application provides a management method for a battery pack, and by using the method, the SOH value of the battery pack in the energy storage device can be effectively detected, and the battery pack can be accurately managed, so that the normal operation of the energy storage device is ensured.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and specific embodiments.
The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present application, "at least one" means one, two, or more than two.
Reference throughout this specification to "one embodiment," "an embodiment," or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather mean "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically noted.
As shown in fig. 1, in an example provided herein, a management method of a battery pack may include the steps of:
step S110: detecting that the battery pack reaches the calibration condition.
Step S120: the SOC limit for the battery pack is released.
Step S130: and fully charging and emptying the electric quantity of the battery pack to obtain the maximum discharge quantity of the battery pack.
Step S140: and acquiring the rated capacity of the battery pack.
Step S150: the SOH value is calculated based on the maximum discharge capacity and the rated capacity of the battery pack.
Step S160: and updating the SOC limit value of the battery pack according to the obtained SOH value, and starting the SOC limit of the battery pack.
Specifically, the energy storage device may include at least one battery pack, and during normal operation of the energy storage device, the battery pack may be in a normal charging state, a normal discharging state, or a state in which neither is charged nor discharged. When the battery pack is detected to reach the condition that the SOH calibration is needed, the SOH calibration can be executed on the battery pack. When the SOH is calibrated, the SOC limit of the battery pack is firstly released, so that the electric quantity of the battery pack can be fully charged and discharged, and the maximum discharge quantity of the battery pack can be truly and effectively detected. Then, the battery can be fully charged and discharged, so that the maximum discharge capacity of the battery pack is obtained. The SOH value can be calculated by obtaining the rated capacity of the battery pack and based on the rated capacity and the maximum discharge amount. And finally, starting SOC limitation on the battery pack to recover the battery to a normal working state.
In the energy storage device with the limitation on the SOC, by applying the management method of the battery pack provided by the embodiment of the application, the limitation on the SOC can be removed according to the requirement, so that the real and effective SOH value of the battery pack can be obtained.
Among other things, SOC limitations may be manifold.
For example, the SOC limit value may be set to reasonably set the lower charge limit or the upper discharge limit of the battery pack to prevent the battery pack from being overcharged or overdischarged, thereby ensuring the safety and the service life of the battery. Specifically, assuming that the rated capacity of the battery pack is 1000ah, the limit range of the soc is 15% -90%. During the charging process, when the electric quantity in the battery pack reaches 900AH, the electric energy is stopped being stored continuously, so that the battery is prevented from being overcharged. In addition, when the electric quantity in the battery pack reaches 150AH, the electric energy is stopped to be discharged, so that the battery is prevented from being over-discharged.
Alternatively, the standby power capacity of the battery pack can be set reasonably by setting the SOC limit value. Specifically, assuming that the rated capacity of the battery pack is 1000ah, the limit range of the soc is 20% -80%. When the electric quantity in the battery pack reaches 800AH, the battery pack stops continuously storing the electric energy, so that the battery pack can have the electric storage capacity of 200AH. When the battery pack is temporarily called to store power, the battery pack still has a capacity of 200AH to store power. In addition, when the power in the battery pack reaches 200AH, the power release is stopped, so that the battery pack can have the residual power of 200AH. When the battery pack is temporarily called to discharge, the battery pack still has 200AH of power to be output outwards.
It can be understood that the management method of the battery pack provided by the embodiment of the present application may be applied to an energy storage device that only limits the upper limit of the SOC, may also be applied to an energy storage device that only limits the lower limit of the SOC, or may also be applied to an energy storage device that both limits the upper limit and the lower limit of the SOC.
In addition, the user can also modify the SOC limit value according to the SOH value in specific applications. Alternatively, the SOC limit value may be automatically updated.
For example, as shown in fig. 1, in the example provided in the embodiment of the present application, the SOC limit value of the battery pack may be automatically updated by applying the management method of the battery pack.
Specifically, the rated capacity of the battery pack is 1000ah and the upper limit of the soc is 80%. When the electric quantity in the battery pack reaches 800AH, the battery pack stops continuously storing the electric energy, so that the battery pack can have 200AH of standby power. When the capacity of the battery pack is attenuated, the capacity may be attenuated from 1000AH to 900AH. However, based on the original SOC limit value, when the amount of electricity in the battery pack reaches 800AH, the electric energy is stopped from being stored. At this time, the battery pack actually stores electric energy with a capacity of only 100AH, which is smaller than the original 200AH. Therefore, when the battery pack is temporarily called to store electricity, the amount of electricity that can be stored is less than expected, thereby affecting the rational use of the battery pack.
Therefore, the limit value of the SOC can be recalculated, so that the battery pack still has the power supply capacity of 200AH. Specifically, it can be known through calculation that, under the condition that the maximum discharge capacity of the battery pack is 900AH and the power reserve capacity is still 200AH, the upper limit value of the SOC should be updated to (900-200)/900% =78%.
In addition, in the energy storage device with the limitation on the SOC, by applying the management method of the battery pack provided by the embodiment of the application, the limitation on the SOC can be removed as required, so as to obtain the real and effective SOH value of the battery pack. Besides updating the SOC limit value, other functions may be implemented according to the obtained SOH value.
For example, as shown in fig. 2, in another example provided in the present application, the method may further include step S170: and when the obtained SOH value is smaller than the preset value, stopping the charge and discharge function of the battery pack.
The preset value may be a critical value for recycling the battery pack, and the SOH value of the battery pack may be compared with the preset value to determine whether the battery pack needs to be recycled. In particular, there are currently no complete regulatory and recovery legislative requirements worldwide. However, considering safety and reliability of use, it is common in the industry to consider an end of life (EOL) when the SOH value of the battery pack is 80%. Therefore, the user can determine whether the battery pack needs to be collected based on the SOH value.
Alternatively, in the management method of the battery pack, the battery pack reaching the end of life may be actively powered off. For example, the SOH value obtained in the calibration process may be compared with a preset value (e.g., SOH value at end of life), and when the SOH value is smaller than the SOH value at end of life, the charging function and the discharging function of the battery pack may be stopped, and the user may be prompted to perform recycling, etc.
According to the management method of the battery pack, the SOH value is obtained after the electric quantity of the battery pack is emptied, and after the obtained SOH value is smaller than the preset value (such as the SOH value of the service life end point), because the electric quantity is not stored in the battery pack, the battery pack does not have the adverse conditions of electric leakage, swelling and the like after the charging function and the discharging function of the battery pack are stopped, and the use safety of energy storage equipment is favorably ensured.
In addition, in practical applications, the calibration conditions of the battery may be varied.
For example, as shown in fig. 3, the calibration condition may include that the total charge/discharge amount of the battery pack reaches a preset value, or that a preset time period is reached from the last calibration process of the battery pack.
Specifically, after the battery pack is used for the first time, the charging and discharging amount of the battery pack may be recorded, and when the charging and discharging amount reaches a preset value (for example, 90000 AH), it may be determined that the battery pack reaches the calibration condition, and SOH calibration of the battery pack is required. After the SOH calibration process is finished, the charge and discharge amount of the battery pack can be recorded again, and when the total charge and discharge amount reaches the preset value (for example 90000 AH) again, the SOH calibration can be performed again.
Alternatively, the total charge/discharge amount may be integrated. For example, when the total charge/discharge amount reaches a first preset value (e.g., 90000 AH), the first SOH calibration may be performed. When the total charge/discharge amount reaches a second preset value (e.g., 180000 AH), a second SOH calibration may be performed.
It will be appreciated that in practice, the difference in total charge and discharge between each SOH calibration may be uniform (e.g., 90000AH as described above). Of course, the difference between the total charge and discharge amount of each SOH may be gradually decreased to increase the SOH calibration frequency as the battery pack is used for a long time. For example, in the case of accumulating charge and discharge, when the total charge and discharge amount reaches a first preset value (e.g., 90000 AH), the first SOH calibration may be performed. When the total charge/discharge amount reaches a second preset value (e.g., 180000 AH), a second SOH calibration may be performed. When the total charge/discharge amount reaches a third preset value (e.g., 260000 AH), a second SOH calibration may be performed. That is, the difference in the total charge and discharge amount between the second and first SOH calibrations was 90000AH, and the difference in the total charge and discharge amount between the third and second SOH calibrations was 80000AH.
In addition, after the battery pack is used for the first time, timing can be started, and when the working time reaches a preset time (for example, 720 hours), it can be determined that the battery pack reaches the calibration condition, and SOH calibration needs to be performed on the battery pack. After the SOH calibration process is finished, the operating time of the battery pack can be recorded again, and when the operating time reaches the preset value (for example, 720 hours) again, the SOH calibration can be performed again.
Alternatively, the operation time period may be accumulated. For example, when the working time reaches a first preset value (e.g. 720 hours), the first SOH calibration may be performed. When the operating time reaches a second predetermined value (e.g., 1440 hours), a second SOH calibration may be performed.
It will be appreciated that in practical applications, the difference in the length of operation between each SOH calibration may be consistent (e.g., 720 hours as described above). Of course, the difference between the working time lengths of two SOHs can be gradually reduced along with the long-term use of the battery pack so as to increase the SOH calibration frequency. For example, in the case of accumulating charging and discharging, when the operating time reaches a first preset value (e.g., 720 hours), the first SOH calibration may be performed. When the operating time reaches a second predetermined value (e.g., 1440 hours), a second SOH calibration may be performed. When the working time reaches a third preset value (e.g. 2140 hours), a second SOH calibration may be performed. I.e., 720 hours difference between the second and first SOH calibrations and 700 hours difference between the third and second SOH calibrations.
Of course, in practical applications, the calibration condition may include only the total charge and discharge amount of the battery pack, or may include only the operating time of the battery pack. Alternatively, the total charge and discharge amount and the operation time period of the battery pack may be included.
And when the calibration condition comprises the total charge and discharge amount and the working time of the battery pack, if the total charge and discharge amount reaches a preset value and the working time does not reach the preset time, judging that the calibration condition is reached. If the working time reaches the preset time and the total charge-discharge amount does not reach the preset value, the calibration condition can be judged to be reached.
In summary, when two or more setting factors (the above-described charge and discharge total amount or the operating time period) are included in the calibration conditions, the first reached factor may be the calibration condition for performing the calibration process.
It is understood that in other examples, the calibration condition may include other setting factors, which are not described in detail herein.
In addition, in specific implementation, the method for managing the battery pack may further include: the SOH value is stored. After the SOH value is stored, the historical SOH value can be checked, compared or calculated conveniently, so that the management effect on the energy storage device is improved conveniently.
In practical applications, a plurality of battery packs may be included in the energy storage device. When all the plurality of battery packs reach the calibration condition, the SOH calibration may be performed on the battery packs that reach the SOH calibration condition, or the SOH calibration may be performed on the plurality of battery packs in sequence according to a set condition.
For example, in practical implementation, the method for managing a battery pack may further include: when the plurality of battery packs reach the calibration condition, obtaining the SOH values of the plurality of battery packs at the last time; and calibrating the plurality of battery packs in sequence according to the SOH value from small to large.
In summary, the battery packs with smaller SOH values can be preferentially subjected to SOH calibration in the order from small to large of the last SOH value, so as to ensure the use safety and stability of the energy storage device. Generally, the smaller the SOH value of the battery pack, the lower the safety and stability of the battery pack. Therefore, the earlier the SOH value is calibrated, the earlier the problem can be found, and the use safety and the stability of the energy storage device can be ensured.
In addition, it is contemplated that during SOH calibration of one or more battery packs of the energy storage device, additional battery packs may also reach the calibration condition.
Therefore, the embodiment of the application also provides another management method of the battery pack. Specifically, the method further comprises: when the plurality of battery packs reach the calibration condition, obtaining respective last SOH values of the plurality of battery packs; and calibrating the plurality of battery packs in sequence according to the SOH value from small to large.
In addition, in other examples, the SOH calibration order of the plurality of battery packs may also be determined by other parameters, which are not described herein again.
Of course, in practical applications, the SOH calibration sequence of the battery pack may be set according to the hardware condition or the usage condition of the energy storage device.
For example, when all the battery packs in the energy storage device can be subjected to SOH calibration at the same time, the calibration order of the battery packs may not be limited. In addition, when a plurality of battery packs are connected to other devices (such as photovoltaic devices) through the same inverter, only one battery pack among the plurality of battery packs is allowed to perform SOH calibration.
Or, in order to avoid obviously influencing the charging and discharging functions of the energy storage device due to SOH calibration, the SOH calibration may be selectively performed on a part of the battery packs, and the other part of the battery packs may be in normal charging and discharging operations.
In addition, as shown in fig. 4, an embodiment of the present application further provides a management apparatus for a battery pack, which may include a Battery Management Unit (BMU), a Battery Control Unit (BCU), and a Battery Management System (BMS). The BMU is connected with the battery pack and used for monitoring relevant parameters of the battery pack, such as current, voltage, temperature and the like, and transmitting the parameters to the BCU for control. The BCU is responsible for collecting BMU information and is in communication connection with the BMS. The battery management unit can perform calculation, judgment and the like based on relevant parameters such as current, voltage, temperature and the like of the battery pack collected by the BCU, and sends a control signal to the battery management unit through the battery control unit so as to control the working state of the battery pack.
In practical applications, the energy storage device includes a plurality of battery packs connected in series and parallel, so that the energy storage device can have high power storage capacity and high discharge capacity.
The battery pack generally comprises a plurality of series-connected naked electric cores, an outer shell, naked electric cores arranged in the outer shell, electrolyte and other structures. In addition, each battery pack is also provided with a BMU, and is packaged into an integral structure by adopting a packaging process.
In the management device for a battery pack according to the embodiment of the present application, the BMU is configured to request the BCU for a calibration procedure after detecting that the battery pack reaches the calibration condition, and the BCU may transmit the request to the BMS. The BMS arbitrates the calibration request and judges whether to execute a calibration process on the battery pack. After the BMS confirms to execute the calibration process, a control signal is sent to the BMU through the BCU, so that the BMU removes the SOC limit of the battery pack, fully charges the electric quantity of the battery pack and empties the battery pack, and the BMU can detect the maximum discharge quantity of the battery pack and transmit the detected maximum discharge quantity value to the BMS through the BCU. The BMS calculates an SOH value based on a maximum discharge amount and a rated capacity of the battery pack. And finally, enabling the BMU to start the SOC limitation on the battery pack so as to enable the battery pack to recover to a normal working state.
It is understood that, in other examples, a battery cluster management unit may be generally disposed between the BCUs and the BMS for the convenience of battery management, and a plurality of BCUs may constitute one battery cluster and be managed by one battery cluster management unit, and the BMS may control the plurality of battery cluster management units, thereby implementing multi-level management.
Of course, in other examples, the determination of the SOH calibration procedure may be performed by the BMS.
For example, a calibration procedure may be requested from the BCU after the BMU detects that the battery pack has reached the calibration condition. The BCU judges whether to execute a calibration process on the battery pack based on the request calibration process. And after the BCU confirms that the calibration process is executed, the BMU releases the SOC limit of the battery pack, fully charges the electric quantity of the battery pack and empties the battery pack, so that the BMU can detect the maximum discharge quantity of the battery pack and transmits the detected maximum discharge quantity value to the BCU. The BCU calculates the SOH value based on the maximum discharge capacity and the rated capacity of the battery pack. And finally, the BCU controls the BMU to start the SOC limitation on the battery pack so as to restore the battery pack to a normal working state.
In addition, when the system is implemented, the BCU or the BMS can calculate and update the SOC limit value based on the SOH value so as to ensure the accuracy and the effectiveness of the SOC limit.
In addition, the management device of the battery pack may further include a memory, which may be connected to the BCU or the BMS, for storing parameters such as SOH values to facilitate operations such as retrieving, calculating, and the like of historical SOH values.
In practical application, the management device of the battery pack provided by the embodiment of the application can be applied to various different types of energy storage systems such as photovoltaic energy, wind energy and tidal energy.
For example, as shown in fig. 5, an energy storage system is further provided in an embodiment of the present application. The energy storage system is taken as an example of a light storage system. In the light storage system, management devices (not shown) of photovoltaic devices, energy storage devices and battery packs may be included. The photovoltaic equipment is used for converting solar energy into electric energy, the energy storage equipment is connected with the photovoltaic equipment, the electric energy generated by the photovoltaic equipment can be effectively stored, and the energy storage equipment can also provide the electric energy for a power grid or electric equipment when needed. Between the energy storage device and the photovoltaic device, the connection can be performed through a direct current-direct current converter (DC/DC), so that the voltage output by the photovoltaic device can be effectively modulated to be stably and effectively provided for the energy storage device. The energy storage device may be connected to the grid via an alternating current to direct current converter (AC/DC), so that the DC power output by the energy storage device may be converted into AC power and provided to the grid. In the energy storage device, a plurality of battery packs may be included, and the management apparatus of the battery packs may calibrate SOH of the battery packs. In the structure, some devices in the management device of the battery pack can be integrated in the battery pack. For example, the BMU and the BCU in the management device of the battery pack may be packaged in the battery pack.
It is understood that, in practical applications, the light storage system may further include a heat management device, a fire fighting device, and the like, which are not described herein again. In addition, the present application does not limit the specific application scenarios of the battery pack management method and the battery pack management apparatus.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for managing a battery pack, comprising:
detecting that a battery pack reaches a calibration condition to remove the SOC limit of the battery pack;
fully charging and emptying the electric quantity of the battery pack to obtain the maximum discharge quantity of the battery pack;
acquiring the rated capacity of the battery pack;
calculating an SOH value based on the maximum discharge capacity and a rated capacity of the battery pack;
updating the SOC limit value of the battery pack according to the obtained SOH value, and starting SOC limit on the battery pack; or stopping the charge and discharge function of the battery pack when the obtained SOH value is smaller than a preset value.
2. The method of claim 1, wherein the calibration condition comprises:
the total charge and discharge amount of the battery pack reaches a preset value, or the time from the last calibration process of the battery pack reaches a preset duration.
3. The method of claim 1 or 2, further comprising:
the SOH value is stored.
4. The method of any of claims 1 to 3, further comprising:
when the plurality of battery packs reach the calibration condition;
acquiring the respective last SOH values of the plurality of battery packs;
and calibrating the plurality of battery packs in sequence according to the SOH value from small to large.
5. A management device for a battery pack, comprising:
the battery management unit BMU is used for requesting a calibration process to the battery control unit BCU after detecting that the battery pack reaches the calibration condition;
the BCU is used for enabling the BMU to remove the SOC limitation on the battery pack based on the request calibration process, and fully charging and emptying the electric quantity of the battery pack;
the BMU is used for detecting the maximum discharge capacity of the battery pack and calculating an SOH value based on the maximum discharge capacity and the rated capacity of the battery pack;
the BCU is further used for updating the SOC limit value of the battery pack according to the obtained SOH value and controlling the BMU to start SOC limit on the battery pack; or stopping the charge and discharge function of the battery pack when the obtained SOH value is smaller than a preset value.
6. The management device of battery pack according to claim 5, wherein the calibration condition includes: the total charge and discharge amount of the battery pack reaches a preset value, or the time from the last calibration process of the battery pack reaches a preset duration.
7. The management device of the battery pack according to claim 5 or 6, further comprising a memory connected to the BCU.
8. The management device of battery packs according to any one of claims 5 to 7, characterized by further comprising a battery management system BMS, which is connected with the BCU.
9. The battery pack management apparatus according to claim 8, wherein the BMS is configured to acquire a last SOH value of each of the plurality of battery packs when each of the plurality of battery packs reaches the calibration condition, and sequentially calibrate the plurality of battery packs from small to large in accordance with the SOH values.
10. An energy storage system, characterized by comprising a battery pack and a management device according to any one of claims 5 to 9 for managing the battery pack.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211428385.2A CN115799672A (en) | 2022-11-15 | 2022-11-15 | Management method and device of battery pack and energy storage system |
| CN202310729492.7A CN116885299A (en) | 2022-11-15 | 2023-06-16 | Battery pack management method, device and energy storage system |
| PCT/CN2023/105576 WO2024103801A1 (en) | 2022-11-15 | 2023-07-03 | Battery pack management method and apparatus, and energy storage system and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211428385.2A CN115799672A (en) | 2022-11-15 | 2022-11-15 | Management method and device of battery pack and energy storage system |
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| CN115799672A true CN115799672A (en) | 2023-03-14 |
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| CN202211428385.2A Pending CN115799672A (en) | 2022-11-15 | 2022-11-15 | Management method and device of battery pack and energy storage system |
| CN202310729492.7A Pending CN116885299A (en) | 2022-11-15 | 2023-06-16 | Battery pack management method, device and energy storage system |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310729492.7A Pending CN116885299A (en) | 2022-11-15 | 2023-06-16 | Battery pack management method, device and energy storage system |
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| CN (2) | CN115799672A (en) |
| WO (1) | WO2024103801A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116526641A (en) * | 2023-07-05 | 2023-08-01 | 合肥华思系统有限公司 | Full charge SOC calibration method, medium and equipment of centralized energy storage system |
| CN117394484A (en) * | 2023-10-18 | 2024-01-12 | 法罗电力(浙江)有限公司 | Battery management method and system in energy storage device |
| WO2024103801A1 (en) * | 2022-11-15 | 2024-05-23 | 华为数字能源技术有限公司 | Battery pack management method and apparatus, and energy storage system and battery pack |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5527183B2 (en) * | 2010-12-01 | 2014-06-18 | 株式会社デンソー | Battery control system, charge / discharge control ECU |
| CN104483628B (en) * | 2014-11-11 | 2019-12-13 | 惠州市亿能电子有限公司 | Device and method for detecting health state of battery pack of electric vehicle |
| CN112147524B (en) * | 2019-06-28 | 2022-04-15 | 比亚迪股份有限公司 | Battery capacity calibration method and device, storage medium and electronic equipment |
| CN112698209B (en) * | 2020-12-15 | 2023-09-29 | 西安奇点能源股份有限公司 | SOC tail end calibration method for battery energy storage system |
| CN113376537A (en) * | 2021-05-28 | 2021-09-10 | 阳光电源股份有限公司 | Capacity calibration method of energy storage system, battery management system and inversion system |
| CN115799672A (en) * | 2022-11-15 | 2023-03-14 | 华为数字能源技术有限公司 | Management method and device of battery pack and energy storage system |
-
2022
- 2022-11-15 CN CN202211428385.2A patent/CN115799672A/en active Pending
-
2023
- 2023-06-16 CN CN202310729492.7A patent/CN116885299A/en active Pending
- 2023-07-03 WO PCT/CN2023/105576 patent/WO2024103801A1/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024103801A1 (en) * | 2022-11-15 | 2024-05-23 | 华为数字能源技术有限公司 | Battery pack management method and apparatus, and energy storage system and battery pack |
| CN116526641A (en) * | 2023-07-05 | 2023-08-01 | 合肥华思系统有限公司 | Full charge SOC calibration method, medium and equipment of centralized energy storage system |
| CN116526641B (en) * | 2023-07-05 | 2023-09-19 | 合肥华思系统有限公司 | Full charge SOC calibration method, medium and equipment of centralized energy storage system |
| CN117394484A (en) * | 2023-10-18 | 2024-01-12 | 法罗电力(浙江)有限公司 | Battery management method and system in energy storage device |
| CN117394484B (en) * | 2023-10-18 | 2024-05-24 | 法罗电力(浙江)有限公司 | Battery management method and system in energy storage device |
Also Published As
| Publication number | Publication date |
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| WO2024103801A1 (en) | 2024-05-23 |
| CN116885299A (en) | 2023-10-13 |
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