CN113708449A - Satellite storage battery module system - Google Patents
Satellite storage battery module system Download PDFInfo
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- CN113708449A CN113708449A CN202110979665.1A CN202110979665A CN113708449A CN 113708449 A CN113708449 A CN 113708449A CN 202110979665 A CN202110979665 A CN 202110979665A CN 113708449 A CN113708449 A CN 113708449A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
Abstract
The invention relates to a satellite battery module system, comprising at least: the power generation device comprises a plurality of power generation units for outputting electric energy to be stored by the power supply device or consumed by the system energy consumption device; and the power supply device is electrically connected with the power generation device and comprises a plurality of secondary battery power supply modules which convert the electric energy output by the power generation device into chemical energy for storage and convert the chemical energy into the electric energy when power supply is needed. The power generation unit comprises a plurality of power generation cells for generating electric energy and a photovoltaic power generation module for outputting the electric energy, the secondary battery power supply module comprises a plurality of secondary battery boxes and a secondary battery management module which are connected in a matched mode, an integrated circuit in the secondary battery management module can be connected with the secondary battery boxes in a one-to-one correspondence mode and can conduct charge and discharge regulation and control on the secondary batteries, a plurality of secondary batteries in the secondary battery boxes are connected in series or in parallel in a modularized mode, and the secondary batteries are connected with an energy consumption device to adapt to the internal demand and external change of a satellite system.
Description
Technical Field
The invention relates to the field of satellite power supply system design, in particular to a satellite storage battery module system.
Background
The micro-nano satellite becomes a research hotspot in the field of commercial aerospace by virtue of the advantages of low cost, short development period and the like, and has wide attention worldwide. The capacity of a storage battery in the micro-nano satellite is generally smaller, and according to the design of the conventional satellite power supply, the discharge depth of the storage battery can exceed 70% after the satellite is separated from the carrier. Such a high depth of discharge may cause the satellite to power down or even be lost. And the satellite may have unstable attitude or abnormal equipment state in the in-orbit operation, and these factors may cause the storage battery to be over-discharged and damaged.
At present, a power supply system of a satellite is generally a solar cell array-storage battery power supply system, the time of the satellite for one circle around the earth is an orbital period, and the orbital period generally comprises a shadow time and an illumination time, wherein the shadow time refers to the time when the satellite is not irradiated by sunlight in the orbital period, and the illumination time refers to the time when the satellite is irradiated by the sunlight in the orbital period. The solar cell array is illuminated to generate power in illumination time, so that energy is provided for satellite electric equipment, and meanwhile, the storage battery pack is charged; in the shadow time, the storage battery pack discharges to provide energy for the satellite electric equipment. Every time the accumulator battery passes through a orbit period, the accumulator battery passes through a charge-discharge cycle, and along with the increase of the number of the charge-discharge cycles, the charge retention capacity of the accumulator battery is gradually reduced, namely after the accumulator battery is charged to the same charge final voltage, when the same electric quantity is discharged, the discharge final voltage of the accumulator battery is gradually reduced. In addition, the cycle life of a battery pack is inversely related to the depth of discharge in each charge/discharge cycle, and in order to extend the on-rail service life of the battery pack, it is necessary to limit the depth of discharge. When the storage battery pack discharges, the charge states of the storage battery pack under different voltages are related to the temperature, but when the satellite runs in an orbit, the temperature of the storage battery pack can be generally ensured to be within the optimal working temperature range for a long time, and the charge-discharge system during the on-orbit running is basically constant, so that the voltage of the storage battery pack can represent the charge state of the storage battery pack.
The safety protection mode of the existing satellite is designed simply, and only a power supply system protection design which can enable the satellite to enter a minimum power consumption mode and a storage battery pack over-discharge protection design which enables the storage battery pack to be disconnected with a power supply bus are designed. Such a design has the following problems: the discharge final voltage reduction caused by the normal attenuation of the storage battery pack cannot be pre-warned, when the effective load is normally used, the voltage of the storage battery pack is lower than a designed voltage threshold value due to the performance attenuation of the storage battery pack, and the satellite enters a low-power-consumption mode to influence the effective load to execute a task; the storage battery pack cannot be managed in a grading mode under the condition of low voltage, different coping strategies are given for different voltage values, the storage battery pack cannot be managed in a refined and autonomous mode under the condition of low voltage, and the service life of the storage battery pack is prolonged; if the storage battery pack is over-discharged due to a certain satellite fault, the storage battery pack is disconnected with a satellite power supply bus, and the satellite is powered off in shadow time, when the situation occurs, the situation that the normal line of a solar battery array is perpendicular to sunlight can occur when the satellite enters illumination time due to unknown attitude of the satellite, so that the solar battery array cannot generate electricity under illumination, and the satellite fails.
CN106100096B discloses a micro-nano satellite low-voltage high-efficiency power supply system, which adopts a 12V low-voltage non-regulated bus topological structure, takes a lithium ion storage battery pack as an energy storage mechanism, and adopts a shunt regulation mode to realize power regulation and voltage stabilization and constant-current and constant-voltage charging of the storage battery pack. Grouping and connecting the solar cell arrays, and respectively and correspondingly supplying power and shunt power; the shunt circuit is designed with fault isolation, and when the system judges that the shunt circuit has a fault, the functions of stabilizing a bus and charging a storage battery pack at a constant voltage are realized through a group of switches which are backups for the shunt circuit; the satellite-ground power supply interface can realize that the satellite starts to work after being powered on when the satellite and the arrow are separated; the charging management and the over-discharge protection can be carried out aiming at different service life periods. The power supply system has the characteristics of low power consumption, small volume and light weight, and can be applied to a micro-nano satellite power supply system with the whole satellite load power consumption of 5-100W.
CN107579587B discloses an energy system suitable for LEO satellite and a control method thereof, comprising a solar cell array, an MPPT circuit unit, a storage battery, a capacitor array, a satellite platform load and a remote measuring and controlling unit; the MPPT circuit unit performs peak power tracking on a solar cell array according to a triple redundancy hot backup mode by adopting three DC-DC conversion modules connected in parallel, performs closed-loop control by adopting a majority voting control circuit, and generates a driving signal to perform closed-loop control on an MPPT circuit corresponding to each control circuit according to an output voltage signal and an output current signal of the solar cell array module and a voltage signal and a current signal of a storage battery pack so as to realize maximum power tracking on the solar cell array module and charge management on the storage battery pack. The solar cell array has the advantages of high utilization rate, high reliability and low system overhead.
Even so, the battery modules currently used in satellite systems in the prior art still present at least one or several technical problems:
1. when the storage battery module used by the existing satellite system implements the balance of charging and discharging and the protection control of a circuit, the circuit design and the arrangement mode are complex;
2. when an existing satellite system is used for designing a storage battery module and a protection control circuit of the storage battery module, the existing satellite system is basically customized, namely, the existing satellite system is designed for each satellite singly, so that the adaptability and the expandability of the existing satellite system are relatively poor, and the business development of commercial satellites is not facilitated.
Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides a satellite battery module system, which is directed to solving at least one or more of the technical problems of the prior art.
In order to achieve the above object, the present invention provides a satellite battery module system capable of implementing balanced current sharing control of secondary batteries, which at least comprises: the power generation device comprises a plurality of power generation units for outputting electric energy to be stored by the power supply device or consumed by the system energy consumption device; the power supply device is electrically connected with the power generation device and comprises a plurality of power supply units which store the electric energy output by the power generation device and supply the electric energy to the energy consumption device for consumption; the power supply unit comprises a secondary battery box which is matched with the power generation battery to convert electric energy into chemical energy for storage and convert the chemical energy into electric energy when power supply is needed.
Preferably, the power supply device further comprises a secondary battery management module, and the secondary battery management module is matched and connected with the secondary battery box to form a group of secondary battery power supply modules so as to meet the internal requirements and external changes of the system.
Preferably, the secondary battery management module performs voltage equalization of the secondary battery cartridge by:
a1, determining a battery voltage deviation value within a safety range according to the electric quantity parameters of each single battery in the secondary battery box,
a2, monitoring the voltage of all the single batteries through the secondary battery management module, calculating the average voltage value of all the single batteries, and if the difference between the maximum voltage value and the minimum voltage value exceeds the expected voltage deviation value of the single batteries, controlling the shunt by the secondary battery management module to make the voltage of the single batteries approach the average voltage.
The secondary battery management module is used for performing voltage equalization management on the single batteries with the voltage values higher than the average voltage.
Preferably, the equalizing current-sharing management method of the secondary battery management module is divided into an energy consumption shunt method and an energy transfer method, wherein the energy consumption shunt method consumes redundant charges during charging, and consumes the energy of a high-voltage or high-charge electric core of a single battery in the secondary battery box through a resistor, so as to achieve the purpose of reducing the difference between different single batteries; the energy transfer method redistributes charges during charging and discharging, and if the difference between the maximum voltage value and the minimum voltage value of the single battery exceeds the expected voltage deviation value of the single battery, the secondary battery management module controls shunting to transfer energy to the battery with lower voltage, thereby realizing balanced charging and discharging of the secondary battery box.
Preferably, the balancing time and the balancing current required by the secondary battery management module to perform the balancing management are set according to an average time of the complete operation of the unit batteries in the secondary battery pack for at least one cycle.
Preferably, the secondary battery management module stops the equalization control of the secondary battery cartridge when the balancing time reaches, or stops the equalization control of the secondary battery cartridge when the next charging cycle ends and the voltage of the battery cell most charged reaches the end voltage.
Preferably, the power generation device comprises a plurality of power generation cells for generating electric energy and a photovoltaic power generation module for outputting the electric energy, the power generation cells and the photovoltaic power generation module are connected in a matched mode to form a group of power generation units, the power generation units generate power by utilizing the photovoltaic principle, each group of power generation units are not affected with each other and can be used after being replaced, and the power generation cells and the photovoltaic power generation module can select different types according to the requirement of satellite load and are matched with each other to supply the electric energy to the secondary battery power supply module for storage or the energy consumption device for consumption.
Preferably, the secondary battery management module comprises an integrated circuit for controlling the secondary battery box, when the power generation unit outputs electric energy to the secondary battery box for charging, the battery voltage detection unit, the battery current detection unit and the battery temperature detection unit integrated with the secondary battery management module detect the voltage, the current and the temperature of the secondary battery box in the charging process, and eliminate the capacity difference among the single batteries through equalization control, if the voltage, the current or the temperature of the secondary battery box in the charging process are detected to be problematic, the power generation unit is cut off to charge the secondary battery box in time; when the secondary battery box supplies power to the energy consumption device, the voltage, the current and the temperature of the secondary battery box in the charging process are detected by the battery voltage detection unit, the battery current detection unit and the battery temperature detection unit which are integrated by the secondary battery management module, the capacity difference among the single batteries is eliminated through balance control, and if the voltage, the current or the temperature of the secondary battery box are detected to be in a discharging process, the discharging operation of the secondary battery box on the energy consumption device is cut off in time.
Preferably, the secondary battery management module may be provided with a state detection and control protection circuit, the state detection circuit may be capable of detecting a voltage and/or current value of the secondary battery pack and generating a related signal to be transmitted to the remote control device, and the remote control device may be capable of controlling a connection and power supply relationship between the secondary battery pack and the bus based on the detection signal of the state detection circuit. If the battery discharges for a long time without taking control measures, when the electric quantity of the secondary battery box is close to discharge, the whole satellite can be powered off due to insufficient electric quantity within a few minutes, and even if the secondary battery box is overdischarged within a few minutes, the whole satellite still can cause irreversible damage to the secondary battery box.
Preferably, the power generation device comprises a plurality of power generation cells for generating electric energy and photovoltaic power generation modules for outputting electric energy, and the power generation cells and the photovoltaic power generation modules are connected in a matching manner to form a group of power generation units. Due to comprehensive factors such as emission cost and carrying capacity, in order to obtain solar energy to the maximum extent, the power generation battery needs to work at the Maximum Power Point (MPP), a topological structure of a photovoltaic power generation module is adopted, and the photovoltaic power generation module has the characteristics of high specific power, high efficiency, high stability, high integration and the like, is structurally required to be as simple as possible, and functionally needs to be started from a satellite system so as to realize integration of functions such as charging the secondary battery, fully regulating and discharging a direct current bus, generating peak power for stabilizing the working point of the power generation battery and the like, so that the loss of a circuit is reduced, and the specific power of the system is improved.
Preferably, each group of power generation units and each group of secondary battery power supply modules select different types of power generation cells and secondary battery boxes to be matched in the processes of power demand change, environment change and charging and discharging of the secondary battery boxes so as to enable the whole system to work stably, and the power generation units formed on the basis of the different types of power generation cells and the secondary battery boxes are the same as the power generated by the secondary battery power supply modules so as to meet the internal demand and external change of the system.
Preferably, when the satellite system is in the terrestrial shadow period, based on the power demand of the energy consumption device, the power generation battery cannot generate electric energy, and the photovoltaic power generation module connected with the power generation battery transmits a signal to the secondary battery box to supply electric energy to the energy consumption device for consumption, so that voltage balance during discharging of the secondary battery is realized; when the satellite system is in an illumination period, the power generation battery converts absorbed light energy into electric energy to be output to the power supply device for storage or to be consumed by the energy consumption device, and the secondary battery box can be charged again.
The invention has the beneficial technical effects that:
1. the secondary battery box is manufactured by adopting a printed circuit process, the plurality of secondary batteries can be easily connected in series or in parallel in a modularized manner, the integrated circuits in the secondary battery management module can be correspondingly connected with the secondary battery box one by one and can regulate and control the charging and discharging of the secondary batteries, the charging and discharging capacity of the secondary batteries is further improved through the modularized design, and the balance control of the charging and discharging of the batteries in the past is broken through.
2. In the invention, each group of power generation units and each group of secondary battery power supply modules are matched in the processes of power demand change, environment change and secondary battery box charging and discharging so as to enable the whole system to work stably, and the power generation units and the secondary battery boxes can be selected from different types according to the power demand of an energy consumption device, so that the power generation units and the secondary battery power supply modules can be replaced at any time to meet the internal demand and external change of the system, and the whole system can be conveniently made into different adjustment strategies according to different conditions.
3. The integrated circuit in the secondary battery management module, which is matched with the secondary battery, can realize the functions of monitoring the voltage, the current, the temperature and the like of each single battery, and eliminate the capacity difference among the single batteries through balance control, and the integrated circuit in the secondary battery management module has the advantages of simple structure, stable circuit control and high safety performance, can better control the common problems of overcharge, overdischarge, overcurrent, overhigh temperature and the like of the single batteries, has simple structure, stable circuit control and convenient replacement, and simplifies the circuit connection between the secondary battery management module and the secondary battery box.
4. According to the invention, the state of charge of the secondary battery can be estimated through the secondary battery management module, so that accurate residual electric quantity information is provided for reference, the phenomenon that each single battery is overcharged and overdischarged due to electric quantity difference, the service life of the battery is shortened, a nest is prone and the like is prevented, and the safety and the stability of the secondary battery can be improved by monitoring the residual electric quantity information of the single batteries in real time.
Drawings
FIG. 1 is a schematic diagram of a preferred structure of the present invention.
List of reference numerals
1: the power generation device 2: power supply device
10: the power generation unit 20: power supply unit
11: the power generation cell 21: secondary battery box
12: photovoltaic power generation module 22: secondary battery management module
3: energy consumption device 20-1: secondary battery power supply module
Detailed Description
This is explained in detail below with reference to fig. 1.
The invention relates to a satellite storage battery module system capable of realizing balanced current sharing control of secondary batteries so as to break through the secondary battery management mode of the conventional satellite system, which comprises one of the following components: the power generation device 1 comprises a plurality of power generation units 10 for outputting electric energy to be stored by the power supply device 2 or consumed by the system energy consumption device 3, and the power supply device 2 is electrically connected with the power generation device 1 and comprises a plurality of power supply units 20 for converting the electric energy output by the power generation device 1 into chemical energy to be stored and converting the chemical energy into electric energy when power supply is needed.
According to a preferred embodiment, the power supply unit 20 comprises a secondary battery power supply module 20-1, the secondary battery power supply module 20-1 comprises a secondary battery box 21 for storing energy in the form of chemical energy and outputting the energy in the form of electric energy, and a secondary battery management module 22 for controlling the voltage balance of the secondary battery, the secondary battery box 21 is manufactured by adopting a printed circuit process and can easily realize that a plurality of secondary batteries are connected in series or in parallel in a modularized manner and are connected with the energy consumption device 3 forming the series or parallel connection, and an integrated circuit in the secondary battery management module 22 can be connected with the secondary battery box 21 in a one-to-one correspondence manner and can regulate and control the charging and discharging of the secondary battery.
According to a preferred embodiment, a plurality of power generation cells 11 for generating electric energy and photovoltaic power generation modules 12 for outputting electric energy are cooperatively connected to form a group of power generation units 10, the power generation units 10 generate power by using the principle of photovoltaic, each group of power generation units 10 are not affected by each other and can be used for replacement, and the power generation cells 11 and the photovoltaic power generation modules 12 can select different types according to the requirement of satellite load and cooperatively supply the electric energy to the secondary battery power supply module 20-1 for storage or consumption by the energy consumption device 3.
According to a preferred embodiment, the power generation cell 11 comprises a plurality of cells (11-1,11-2, … …, 11-N) capable of absorbing light energy, which are connected in parallel or in series in a modularized manner, and since the design scheme of the invention is based on the particularity of satellite production, the cells should be thin sheet type cells with small structure and good photosensitivity, the cells are connected in series or in parallel by solder strips, and the cells should be configured such that the cells with high production capacity can be easily realized.
According to a preferred embodiment, the kind of capacitive array may be selected from one of the following types: electrolytic capacitors, monolithic capacitors, ceramic chip capacitors, tantalum electrolytic capacitors, polyester capacitors, and the like. Preferably, the capacitor array used in the present embodiment may be a tantalum capacitor. The capacitor in this embodiment has the following functions, but not limited to: filtering, bypassing, decoupling, storing energy, and coupling.
According to a preferred embodiment, the photovoltaic power generation module 12 includes a photovoltaic power generation integrated circuit (12-1,12-2, … …, 12-N) for outputting and transforming electrical energy, and the output terminal of the photovoltaic power generation integrated circuit is connected to the secondary battery pack 21 or the load terminal for storing or consuming energy. Preferably, the conversion method adopted by the photovoltaic power generation module integrated circuit includes but is not limited to: superbuck transform, He-boost transform, Buck-boost transform, and the like.
According to a preferred embodiment, the photovoltaic power generation module integrated circuits are connected in series, and each power generation cell 11 is connected in parallel with the photovoltaic power generation module integrated circuit, wherein the positive input end of the photovoltaic power generation module integrated circuit is connected with the positive electrode of the power generation cell 11, the negative input end of the photovoltaic power generation module integrated circuit is connected with the negative input end of the power generation cell 11, and the former photovoltaic power generation module integrated circuit is connected with the latter photovoltaic power generation module integrated circuit. Preferably, due to the comprehensive factors such as emission cost and carrying capacity, the selection of the topological structure of the photovoltaic power generation module should have the characteristics of high specific power, high efficiency, high stability, high integration and the like, the structural requirement is as simple as possible, and functionally, from the perspective of a satellite system, the integration of the functions of charging the secondary battery, fully regulating and discharging the direct current bus, generating peak power for stabilizing the working point of the power generation battery 11 and the like is realized, so as to reduce the loss of the circuit and improve the specific power of the system, and the adopted topological structure includes, but is not limited to, a series-parallel hybrid photovoltaic power generation module topological structure.
Preferably, the series-parallel hybrid photovoltaic power generation module topology includes a series bus regulator for bus power regulation, a charge regulator and a discharge regulator for charge and discharge management of the secondary battery pack 21, which can achieve maximum utilization of the power generation capacity of the power generation cell 11, and the bus regulator, the charge regulator and the discharge regulator are relatively simple in structure and can be designed separately.
According to a preferred embodiment, the output of the power generation cell 11 has a non-linear characteristic with a unimodal P-V curve. In order to obtain the maximum solar energy, the generator 11 is required to operate at the Maximum Power Point (MPP). When the output power of the power generation battery 11 exceeds the power demand of the energy consumption device 3, the bus regulator and the charging regulator work cooperatively to enable the power generation battery 11 to work near a peak value and maintain the bus voltage stable, the power demand of the energy consumption device 3 determines the electric energy generated by the power generation battery 11, and the residual electric energy is supplied to the secondary battery box 21 for charging; when the power demand of the energy consumption device 3 exceeds the peak power provided by the power generation cell 11, the power generation cell 11 and the secondary battery box 21 are combined to supply power to the load, the bus regulator enables the power generation cell 11 to work at the maximum power point, the discharge regulator provides insufficient electric energy to supply power to the energy consumption device 3, and the bus voltage is maintained to be constant.
Preferably, the secondary battery employs an anode material constituting an active material layer formed on a collector layer of the anode for secondary batteries, which includes: si particles; and a coating material containing Ni and P, which is formed by being distributed in an island-like, dot-like or net-like manner so as to partially cover the surface of the Si particle, not only can provide a life of the secondary battery in cycle use, but also can facilitate insertion and detachment of the electrolyte of the secondary battery, and further improve the charge/discharge capacity of the negative electrode for the secondary battery, in order to provide electric energy to the energy consuming device 3 more favorably.
According to a preferred embodiment, a shell is arranged outside the secondary battery box 21, a ventilation hole is formed in the bottom end of the shell, and a layer of dust screen is arranged on the ventilation hole, so that the secondary battery box 21 can timely dissipate heat during charging and discharging, and the dust screen can prevent raised dust from adhering to the secondary battery box 21 and affecting the service life of the secondary battery box 21.
According to a preferred embodiment, the secondary battery management module 22 comprises an integrated circuit for controlling the secondary battery box 21, when the power generation unit 10 outputs power to the secondary battery box 21 for charging, the battery voltage detection unit, the battery current detection unit and the battery temperature detection unit integrated with the secondary battery management module 22 detect the voltage, the current and the temperature of the secondary battery box 21 during charging, and eliminate the capacity difference between the single batteries through equalization control, if the voltage, the current or the temperature of the secondary battery box 21 are detected to be problematic during charging, the power generation unit 10 is cut off to charge the secondary battery box 21 in time; when the secondary battery box 21 supplies power to the energy consumption device 3, the battery voltage detecting unit, the battery current detecting unit and the battery temperature detecting unit integrated with the secondary battery management module 22 detect the voltage, the current and the temperature during the charging process of the secondary battery box 21, and eliminate the capacity difference between the single batteries through the equalization control, if the voltage, the current or the temperature of the secondary battery box 21 is detected to be problematic during the discharging process, the discharging operation of the secondary battery box 21 to the energy consumption device 3 is cut off in time.
According to a preferred embodiment, a plurality of secondary battery management modules 22 and a secondary battery box 21 are connected in a matching manner to form a group of secondary battery power supply modules 20-1, and each group of secondary battery power supply modules 20-1 is not affected by each other and can be used immediately, and the secondary battery management modules 22 and the secondary battery box 21 can select different types according to the requirement of the satellite load and cooperate to supply electric energy to the energy consumption device 3 for consumption. Each group of power generation units 10 and each group of secondary battery power supply modules 20-1 are matched in the process of power demand change, environmental change and charging and discharging of the secondary battery box 21 so that the whole system can work stably, and the power generation units 10 and the secondary battery power supply modules 20-1 are replaced at any time to meet the internal demand and external change of the system.
According to a preferred embodiment, the secondary battery management module 22 performs voltage equalization on the secondary battery box 21 to control the overcharge, overdischarge, overcurrent, and the like of the unit batteries in the secondary battery box 21. Specifically, the single battery bears a large instantaneous current in the charging and discharging stages to make a part of the full single batteries directly exceed the damaged voltage interval or make some single batteries in a deep discharging state, if not performing equalization control, the voltage of each single battery gradually differentiates along with the increase of the charging and discharging cycle, the service life is greatly shortened, and therefore, the voltage deviation of the single battery needs to be kept in an expected range through the secondary battery management module 22. The principle of voltage equalization is that the cell voltage is compared to the average cell voltage and the secondary battery management module 22 controls the cell shunting where the cell voltage is higher than the average voltage. Therefore, all the cell voltages tend to the average cell voltage under the action of the secondary battery management module 22.
According to a preferred embodiment, the voltage equalization can be divided into a static equalization phase, a discharge equalization phase and a charge equalization phase. Specifically, after the secondary battery pack 21 completes the quick charge and turns off the power generation unit 10, the voltage of each unit cell starts to fall back, the voltage difference starts to shrink, however, the speed of the difference reduction depends on the situation of the consistency difference of the secondary battery box 21, at this time, the secondary battery management module 22 can adjust the speed of the voltage difference reduction, and likewise, after the high-power discharge of the secondary battery box 21 is finished, the voltage of each single battery begins to rebound, the single battery with serious attenuation, the single battery with high rebound speed and slight or non-attenuated attenuation, the rebound speed is low, the voltage difference between the single batteries can be reversely changed due to the difference of the rebound speed, but the speed of the bounce back and the variation of the voltage difference also depend on the uniformity difference of the secondary battery cartridge 21, the secondary battery management module 22 may regulate the speed at which the voltage difference is reduced while in the static equalization phase. The storage capacity of the secondary battery box 21 mainly depends on the consistency and health condition of the single batteries, that is, the capacity of the worst single battery in the secondary battery box 21 is determined, the capacity of the worst single battery represents the actual capacity of the secondary battery box 21, the secondary battery management module 22 controls the single battery with good discharge capacity to discharge more to make up for the deficiency of the discharge capacity of the worst battery, so as to release the effective electric quantity of the secondary battery box 21 as much as possible, and the optimal effect is that the discharge capacity is close to the average capacity of all batteries, and the secondary battery management module 22 adjusts the discharge capacity during the period to make the discharge capacity close to the average capacity, and is in the discharge balancing stage. During charging, the secondary battery management module 22 controls the charging voltage and the charging current of the unit battery in real time, when the voltage consistency difference is small, the small shunt current can meet the requirement, when the voltage consistency difference is increased, the large shunt current is needed to meet the requirement of controlling the voltage of the low-capacity battery, and the secondary battery management module 22 adjusts the shunt current and the real-time voltage, and is in the charging equalization stage at this moment.
According to a preferred embodiment, since the voltage equalization is divided into different stages, the average cell voltage values adapted to the static equalization stage, the discharge equalization stage and the charge equalization stage should be different, i.e. the average cell voltage values may respectively correspond to the static average voltage value of the static equalization stage, the discharge average voltage value of the discharge equalization stage and the charge average voltage value of the charge equalization stage, a cell voltage deviation value within a safety range is predetermined, and when the difference between the maximum voltage value and the minimum voltage value reached at each stage exceeds the expected cell voltage deviation value, the secondary battery management module 22 controls the shunting so that the cell voltage tends to the average battery voltage under the action of the voltage equalization.
According to a preferred embodiment, the equalizing current sharing management method of the secondary battery management module 22 is divided into an energy distribution method and an energy transfer method. Specifically, the energy consumption shunting method consumes redundant charges during charging, and consumes energy of a high-voltage or high-charge electric core of a single battery in the secondary battery box 21 through a resistor, so as to achieve the purpose of reducing the difference between different single batteries; the energy transfer method redistributes charges during charging and discharging, and if a difference between a maximum voltage value and a minimum voltage value of the unit cells exceeds an expected voltage deviation value of the unit cells, the secondary battery management module 22 controls shunting so that energy is transferred to the cells having a lower voltage, thereby achieving balanced charging and discharging of the secondary battery pack 21.
According to a preferred embodiment, the corresponding equalization time and current may be selected based on the average time of one cycle of operation of the unit cells in the secondary battery pack 21. For example, T may be specifiedb(equilibrium time) ═ T1+T2+T3+T4) X 75%, wherein, T1Indicating the charging time, T2Denotes the time of re-discharge after charging, T3Indicates the discharge time, T4Indicating the time to re-discharge after discharge. For passive equalization management, the balance current is typically 0.50A. Preferably, the equalization control for the secondary battery pack 21 will stop after the equilibrium time is reached. Next, if the voltage of the battery cell charged with the largest amount of electricity reaches the end voltage at the end of the next charging cycle, the equalization control for the secondary battery pack 21 is also stopped. Further, the equalization adjustment for the secondary battery case 21 is circulated in this manner. Preferably, based on the equalization adjustment, when the charging of the single batteries is finished, the voltages of all the single batteries can be equal, so that any single battery can exert the maximum available capacity.
According to a preferred embodiment, if the charged battery cell reaches saturation (the full charge is specified as C ═ 1Ah), the current when it communicates with the system energy consumption device is about 1C after about 10 minutes of relaxation (full charge 1Ah is discharged for 1h, and the current is about 1A). After about 10 minutes of relaxation, charge with 1C current for 70 minutes (considering the constant voltage phase). In the case of charging with a conventional large current (4C), the maximum flow balance charge Q is 4C × 10min is 0.67 Ah. Further, in the present embodiment, the balance current is 0.50A. Then the maximum flowThe dynamic balance charge Q' ═ It ═ 0.50A × (10+60+10+70) min ═ 1.25 Ah. The balance mode adopted by the invention and the efficiency thereof
Double, and the balance current is only original
According to a preferred embodiment, when the whole satellite system is in operation, the secondary battery box 21 continuously supplies power to the system energy consumption device, and small current may be needed for charging and discharging in order to maintain or prolong the service life of the secondary battery box 21, so that the method has higher balance efficiency while considering the service life of the secondary battery box 21. For example, if the charged state of the battery cell is saturated (the full charge is defined as C ═ 1Ah), the current when the battery cell is connected to the system power consumption device after about 20 minutes of relaxation is about 0.25C (the full charge is discharged for 4h, and the current is about 0.25A). After an additional relaxation of about 20 minutes, charge is applied with a 0.25C current for 250 minutes (considering the constant voltage phase). In the case of charging with a conventional large current (4C), the maximum flow balance charge Q is 4C × 20min 1.33 Ah. Further, in the present embodiment, the balance current is 0.50A. The maximum flow balance charge Q' It is 0.50A × (20+240+20+250) min is 4.41 Ah. The balance mode adopted by the invention and the efficiency thereof
Double, and the balance current is only original
Preferably, when charging and discharging with a small current, the system will generate less heat due to a longer equilibration time, but still have a higher equilibration efficiency. Because the satellite operating environment is unsupervised for a long time, the problems of thermal runaway and the like are avoided as much as possible. Based on this kind of control mode, the system will greatly reduced to the degree of difficulty or the consumption of secondary battery case 21 heat management and control, and the risk of thermal runaway also reduces consequently. Further, in the embodiment of the present invention, at least one secondary battery management module 22 and at least one secondary battery box 21 are connected to form a secondary battery power supply module (20-1) of the power supply device 2 in combination, so that, based on the modularized configuration manner, in combination with the above-mentioned equalization control method, the number of single batteries to be monitored and managed by any secondary battery management module 22 when performing equalization control on the secondary battery box 21 of the corresponding secondary battery box 21 is reduced, the difficulty of control and adjustment and extra power consumption of the secondary battery management module are reduced, mutual interference between the single batteries is alleviated, the management and adjustment rate and precision of any single battery are improved, and meanwhile, the system is convenient to predict and timely adjust the failure probability of any single battery. In addition, the modularized design and the balance control method can configure space architectures of the whole satellite system in different types so as to meet the requirements of different running energy consumption devices or power, and meanwhile, any secondary battery power supply module (20-1) can exert the maximum available electric energy to improve the power supply efficiency, so that the whole satellite system can be maintained to run stably in space for a long time.
According to a preferred embodiment, the secondary battery management module 22 can estimate the State of Charge (SOC) of the secondary battery, i.e. calculate the ratio of the remaining battery capacity to the rated capacity under the same condition, accurately estimate the SOC of the secondary battery can provide accurate information of the remaining battery capacity as a reference, and prevent the battery from shortening the life, falling down, and the like due to overcharge and overdischarge, the SOC value cannot be directly measured, so that the SOC value needs to be indirectly calculated by analyzing the characteristic parameters of the battery or using a related algorithm. The current commonly used SOC value estimation method mainly comprises a current integration method, a discharge test method, an open-circuit voltage method, a Kalman filtering method, a neural network method and the like, wherein the current integration method is also called an ampere-hour metering method, and essentially estimates the SOC of a battery by accumulating charged or discharged electric quantity when the battery is charged or discharged, and meanwhile, certain compensation is carried out on the estimated SOC according to the discharge rate and the temperature of the battery; the discharge test method is that the target battery is subjected to continuous constant current discharge until the cut-off voltage of the battery, and the time used in the discharge process is multiplied by the magnitude value of the discharge current, namely the value is used as the residual capacity of the battery; the Open Circuit Voltage method is to indirectly fit a one-to-one correspondence relationship between an Open Circuit Voltage (OCV) of a battery and a battery SOC according to a variation relationship between the OCV and a lithium ion concentration inside the battery. In actual operation, the battery is fully charged and then discharged at a fixed discharge rate (generally 1C), and the discharge is stopped until the battery reaches a cut-off voltage, and a relationship curve between the OCV and the SOC is obtained according to the discharge process. When the battery is in an actual working state, the current battery SOC can be obtained by searching an OCV-SOC relation table according to voltage values at two ends of the battery; the nature of the Kalman filtering method is that the state of a complex dynamic system can be optimally estimated according to the least mean square error principle. The nonlinear dynamic system is linearized into a state space model of the system in a Kalman filtering method, the SOC becomes a state variable in the model, and the established system is a linear discrete system; the neural network method is a novel algorithm for processing a nonlinear system by simulating a human brain and neurons thereof, does not need to deeply research the internal structure of a battery, and only needs to extract a large number of input and output samples which accord with the working characteristics of a target battery in advance and input the samples into a system established by the method so as to obtain an SOC value in operation.
According to a preferred embodiment, the secondary battery management module 22 includes a secondary battery integrated circuit adapted to the secondary battery case 21, which is simple in structure, stable in circuit control, and convenient to replace, and simplifies the circuit connection between the secondary battery management module 22 and the secondary battery case 21.
Preferably, based on the particularity that the photovoltaic power generation module 12 charges the secondary battery box 21 and the energy consumption device 3 makes the secondary battery box discharge, the secondary battery management module 22 estimates the state of charge of the secondary battery, and the charging and discharging of the secondary battery are regulated and controlled by an integrated circuit matched with the secondary battery in the secondary battery management module 22, so that the safety and stability of the secondary battery box 21 are improved, the situation that the battery is shortened due to overcharging and overdischarging of the secondary battery box 21, a cavity is prone to collapse and the like is prevented, and the voltage balance of the secondary battery box 21 can be realized at the same time.
Preferably, the integrated circuit in the secondary battery management module 22 adapted to the secondary battery may collect voltage signals and current signals in the secondary battery box 21 and transmit data of the signal indicating that the electric quantity is insufficient or the electric quantity is full to the secondary battery box 21 according to the collected data of the voltage signals and the current signals, and the integrated circuit in the secondary battery management module 22 may divide, shunt, or differentiate the signal according to the data of the signal indicating that the electric quantity is insufficient or the electric quantity is full in the secondary battery box 21, so that the signal data finally appears in the form of constant current or constant voltage.
Preferably, an integrated circuit adapted to the secondary battery in the secondary battery management module 22 allows the secondary battery pack 21 to be charged with a constant current or a constant voltage. When the voltage of the secondary battery is low or the charging is slow, the battery may be a faulty battery, the integrated circuit in the secondary battery management module 22 may control the photovoltaic power generation module 12 to perform weak current charging on the secondary battery, and if the battery is hot or the charging is stopped, the charging on the battery may be cut off; when the voltage of the secondary battery is normal, a voltage expected value is preset, the integrated circuit in the secondary battery management module 22 can control the photovoltaic power generation module 12 to charge the secondary battery in a constant current mode, the constant current is based on the value which can be borne by the secondary battery, the rapid charging is carried out, when the voltage rises to the preset voltage expected value, the voltage expected value is kept unchanged, the integrated circuit in the secondary battery management module 22 controls the photovoltaic power generation module 12 to charge the secondary battery in a constant voltage mode, and meanwhile, the current change in a constant voltage charging mode can be observed in real time through the integrated circuit matched with the secondary battery in the secondary battery management module 22, and the current is cut off when the current is too large.
Furthermore, the consistency of each single battery in the secondary battery box 21 is difficult to realize, the service life after the battery pack is used in groups is very short, thermal runaway is easy to occur, and the characteristics can be different when the battery pack is charged and discharged in series and parallel, so the secondary battery management module 22 needs to regulate and control the charging and discharging of each single battery in the secondary battery box 21, an integrated circuit matched with the secondary battery in the secondary battery management module 22 can realize the functions of monitoring the voltage, current, temperature and the like of each single battery, the integrated circuit in the secondary battery management module 22 has a simple structure, is stable in circuit control and high in safety performance, and can better control common problems of overcharge, overdischarge, overcurrent, overhigh temperature and the like of the single batteries.
Preferably, when the satellite system is in the terrestrial shadow period, the photovoltaic power generation module 12 controls the output power when the electric energy converted by the power generation cell 11 is transmitted to the power supply device 2 based on the acquired voltage and/or current value of the bus bar. The secondary battery management module 22 is capable of detecting the total pressure of the secondary battery case 21 and the voltage and/or current values of the unit cells therein. Specifically, the output power of the secondary battery pack 21 can be controlled by setting the threshold value of the voltage and/or the current. When the secondary battery pack 21 outputs electric energy to the energy consumption device 3 and the voltage and/or current of the secondary battery pack 21 reaches a threshold value, the power supply to the secondary battery pack 21 is cut off to achieve a balanced output management of the secondary battery pack 21.
Preferably, when the satellite system is in a long illumination period, the secondary battery management module 22 controls the input and output voltage and/or current values of the secondary battery pack 21 with reference to a threshold value to prevent excessive input of voltage and/or current to the secondary battery pack 21, thereby causing overcharge, overdischarge, and the like of the secondary battery pack 21. The secondary battery management module 22 can prevent overcharge, overdischarge, etc. of the secondary battery pack 21, thereby contributing to improvement of the life cycle and/or life of the secondary battery pack 21 and further improving reliability of the satellite system.
Preferably, if the battery is discharged for a long time without taking control measures, when the capacity of the secondary-battery cartridge 21 is close to being discharged, the entire star is powered off due to insufficient capacity in as short as several minutes, and even over-discharge in as short as several minutes may still cause irreversible damage to the secondary-battery cartridge 21. In order to avoid the operation failure of the whole satellite system caused by the overdischarge of the secondary battery box 21, an integrated circuit matched with the secondary battery in the secondary battery management module 22 can detect whether the overdischarge of the secondary battery box 21 exists, once the overdischarge of the secondary battery box 21 is detected, the secondary battery management module 22 sends an instruction to temporarily shut down some possibly unnecessary loads, and if the measure still cannot bring obvious effect, the connection relationship between the secondary battery box 21 and the bus can be directly controlled, namely, the way of supplying power by using the secondary battery box 21 is directly cut off. Further, when the satellite system enters an illumination period and the power generation cell 11 can stably output energy, the secondary battery management module 22 sends a signal to reestablish the connection between the secondary battery box 21 and the bus, at this time, the power generation cell 11 can continuously charge the secondary battery box 21, and the secondary battery box 21 is recovered to be normally used.
Preferably, the integrated circuit adapted to the secondary battery in the secondary battery management module 22 adopted in the present embodiment has a wide application range, and can be adapted to various types of secondary battery combinations, including but not limited to specific types and/or numbers of the secondary battery boxes 21. Furthermore, the whole function module can be simply expanded according to the requirement of the satellite application to provide stronger capability, has good expansibility and can meet the diversified requirements of the development of the commercial satellite at present.
The satellite storage battery module system breaks through the management mode of the conventional aerospace secondary battery box 21 for the management of the secondary battery box 21, reduces the design and maintenance cost to a certain extent due to simple circuits, has strong adaptability for an integrated circuit matched with the secondary battery in the secondary battery management module 22 used in the storage battery module system, can meet the combination requirements of various secondary batteries, and realizes the balanced current-sharing input and/or output management of a storage battery pack.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
1. A satellite battery module system, comprising at least:
the power generation device (1) comprises a plurality of power generation units (10) which output electric energy for storage of the power supply device (2) or consumption of the system energy consumption device (3),
the power supply device (2) is electrically connected with the power generation device (1) and comprises a plurality of secondary battery boxes (21) which convert the electric energy output by the power generation device (1) into chemical energy for storage and convert the chemical energy into the electric energy when power supply is needed,
it is characterized in that the preparation method is characterized in that,
the power supply device (2) also comprises a secondary battery management module (22), the secondary battery management module (22) is matched and connected with the secondary battery box (21) to form a group of secondary battery power supply modules (20-1) so as to meet the internal requirements and external changes of the system,
the secondary battery management module (22) achieves voltage equalization of the secondary battery case (21) by:
a1, determining a battery voltage deviation value within a safety range according to the electric quantity parameters of each single battery in the secondary battery box (21),
a2, monitoring the voltage of all the single batteries through the secondary battery management module (22), calculating the average voltage value of all the single batteries, and if the difference between the maximum voltage value and the minimum voltage value exceeds the expected voltage deviation value of the single batteries, controlling the shunt by the secondary battery management module (22) to make the voltage of the single batteries approach the average voltage.
2. The battery module system of claim 1,
the equalizing current-sharing management mode of the secondary battery management module (22) is divided into an energy consumption shunt method and an energy transfer method, wherein,
the energy consumption shunt method consumes redundant charges during charging, and consumes the energy of the high-voltage or high-charge electric core of the single batteries in the secondary battery box (21) through the resistor, so as to achieve the purpose of reducing the difference between different single batteries;
the energy transfer method redistributes charges during charging and discharging, and if the difference between the maximum voltage value and the minimum voltage value of the unit battery exceeds the expected voltage deviation value of the unit battery, the secondary battery management module (22) controls shunting to transfer energy to the battery with lower voltage, thereby realizing balanced charging and discharging of the secondary battery box (21).
3. The battery module system according to claim 2, wherein the balancing time and the balancing current required for the secondary battery management module (22) to perform the balancing management are set according to the average time of at least one cycle of the complete operation of the unit cells in the secondary battery pack (21).
4. The battery module system according to claim 3, wherein the secondary battery management module (22) stops the equalization control of the secondary battery pack (21) when the equalization time is reached, or stops the equalization control of the secondary battery pack (21) when the next charging cycle is over and the voltage of the most charged cell reaches the end voltage.
5. The battery module system according to claim 4, wherein the power generation device (1) comprises a plurality of power generation cells (11) for generating electric energy and photovoltaic power generation modules (12) for outputting electric energy, and the power generation cells (11) and the photovoltaic power generation modules (12) are connected in a matching manner to form a group of the power generation units (10).
6. The battery module system of claim 5,
the power generation unit (10) and the secondary battery power supply module (20-1) in each group select different types of the power generation battery (11) and the secondary battery box (21) to be matched in the processes of power demand change, environment change and charging and discharging of the secondary battery box (21) so as to enable the whole system to work stably, and the power generation unit (10) and the secondary battery power supply module (20-1) formed on the basis of the different types of the power generation battery (11) and the secondary battery box (21) generate the same electric energy so as to meet the internal demand and external change of the system.
7. The battery module system according to claim 6, wherein the secondary battery management module (22) is capable of accurately estimating the state of charge of the secondary battery based on the particularity of charging the secondary battery compartment (21) by the photovoltaic power generation module (12) and discharging it by the energy consumption device (3), regulating the charging and discharging of the secondary battery by an integrated circuit adapted to the secondary battery in the secondary battery management module (22), and simultaneously achieving voltage equalization of the secondary battery compartment (21).
8. The battery module system according to claim 7, wherein the secondary cell management module (22) includes a state detection circuit and a control protection circuit, wherein,
the state detection circuit can be connected to the control protection circuit in a mode of detecting the voltage and/or current value of the secondary battery box (21) and sending a signal to the control protection circuit, and the control protection circuit can control the connection and power supply relation between the secondary battery box (21) and the bus based on the detection signal of the state detection circuit.
9. Accumulator-module system according to claim 8, characterized in that the generator-battery (11) generates electric energy when the satellite system is in the light period and outputs it to the energy consumption device (3) for consumption or to the power supply device (2) for storage in order to put the secondary-battery compartment (21) in a charged state.
10. The battery module system according to claim 9, wherein the power generation cell (11) cannot generate electric energy when the satellite system is in the earth shadow period, and based on the power demand of the energy consumption device (3), the photovoltaic power generation module (12) connected to the power generation cell (11) transmits a signal to the secondary battery box (21) to supply electric energy to the energy consumption device (3) for consumption, so as to achieve voltage equalization when the secondary battery (21) is discharged.
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| EP4297236A1 (en) * | 2022-06-20 | 2023-12-27 | STL Technology Co., Ltd. | Battery equipment discharge balancing method |
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| EP4297236A1 (en) * | 2022-06-20 | 2023-12-27 | STL Technology Co., Ltd. | Battery equipment discharge balancing method |
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