Separate storage type independent charging light storage system

Abstract

The utility model belongs to the technical field of new energy, and discloses a separate storage type independent charging light storage system, which comprises a plurality of light storage modules, a battery discharge protection module and a load, the plurality of optical storage modules are connected in sequence, the plurality of optical storage modules are electrically connected with the battery discharge protection module, and a load is arranged on an electric connection line between the battery discharge protection module and the plurality of optical storage modules; the light storage module comprises a photovoltaic battery pack string, an energy storage battery, a light emitting diode and a relay; wherein the photovoltaic battery pack string, the energy storage battery, the light emitting diode and the relay are connected in series. The device is simple in structure, low in cost, long in service life and high in safety, voltage matching of the photovoltaic battery and the energy storage battery is adopted, independent charging of the photovoltaic battery and the energy storage battery is guaranteed through the relay, and therefore efficient and safe photovoltaic power generation and energy storage are achieved.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a distributed independent charging photovoltaic storage system. Background Art

[0002] As global demand for clean energy continues to grow, solar technology continues to evolve and develop. Today, solar technology is being applied in a growing number of sectors, such as electricity and transportation. Solar energy technology primarily relies on photovoltaic (PV)-storage systems, but current PV-storage systems still face challenges such as high cost, short lifespan, and instability, significantly hindering their further development across various sectors.

[0003] The typical structure of a photovoltaic system consists of photovoltaic panels, a battery energy storage system, and local loads. A unidirectional DC-DC converter primarily boosts the voltage of the photovoltaic power generation unit and tracks the maximum photovoltaic power output; a unidirectional DC-AC inverter converts DC power to AC power that meets the load's requirements; and a bidirectional DC-DC converter primarily controls the charging and discharging of the energy storage unit and provides voltage support for the DC bus. The photovoltaic power generation unit and energy storage unit are connected to a common DC bus through their respective DC / DC converters, which then power the load through a shared DC / AC inverter. As can be seen, the complex structure of a typical photovoltaic system leads to high costs and difficult maintenance, reducing system efficiency and reliability.

[0004] PV systems also present electrical compatibility issues. PV systems typically have lower output voltages, while energy storage systems can have higher voltage levels. Connecting the PV and energy storage systems requires voltage conversion and matching to ensure safe and stable system operation. Consequently, PV-storage systems often use electrical equipment such as transformers and DC / DC converters, increasing system cost and complexity. This can also lead to more failure points during operation, reducing system reliability and stability. Furthermore, these additional electrical devices generate energy losses, reducing overall system efficiency.

[0005] In summary, designing a low-cost, high-efficiency, and highly reliable solar-energy storage system is crucial for solar-energy storage systems to better meet market demand and promote the widespread application of solar technology in various fields. Such a design will allow solar technology to better leverage its clean, renewable advantages and contribute significantly to global energy transformation and sustainable development. Utility Model Content

[0006] The purpose of this application is to provide a distributed storage type independent charging photovoltaic storage system, which detects polarized light through the bulk photovoltaic effect of the structure itself. The system has a simple structure, low cost, long service life, and high safety. It uses photovoltaic and energy storage batteries with voltage matching and independent charging, thereby achieving efficient and safe photovoltaic power generation and energy storage.

[0007] Therefore, this application provides a distributed storage independent charging and solar storage system, which adopts the following technical solutions:

[0008] A distributed independent charging photovoltaic storage system includes multiple photovoltaic storage modules, a battery discharge protection module and a load;

[0009] A plurality of photovoltaic storage modules are connected in sequence, each of the plurality of photovoltaic storage modules is electrically connected to the battery discharge protection module, and the load is provided on the electrical connection line between the battery discharge protection module and the plurality of photovoltaic storage modules;

[0010] The photovoltaic storage module includes a photovoltaic cell string, an energy storage battery, a light-emitting diode and a relay; wherein the photovoltaic cell string, the energy storage battery, the light-emitting diode and the relay are connected in series.

[0011] Furthermore, the photovoltaic cell string includes at least two single photovoltaic cells connected in series.

[0012] Furthermore, the energy storage battery is one of a lithium iron phosphate battery, a ternary lithium battery, a lead-acid battery, and a combination thereof.

[0013] Furthermore, when the photovoltaic cell string is irradiated by sunlight, the output voltage thereof is equal to the charging cut-off voltage of the energy storage battery within a set error range.

[0014] Furthermore, the relay has a control side and a switch side; wherein the control side contains an electromagnet switch, and the switch side is divided into three ports, namely a common port, a normally closed port, and a normally open port.

[0015] Furthermore, the positive electrode of the photovoltaic cell string is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is connected to the positive electrode of the energy storage battery, the negative electrode of the energy storage battery is connected to the control side of the relay, and the control side of the relay is connected to the negative electrode of the photovoltaic cell string.

[0016] Furthermore, the number of the optical storage modules is four, namely a first optical storage module, a second optical storage module, a third optical storage module and a fourth optical storage module;

[0017] The common terminal of the relay of the first solar storage module is connected to the negative electrode of the energy storage battery in the first solar storage module, and the normally closed terminal is connected to the positive electrode of the energy storage battery in the second solar storage module;

[0018] The common terminal of the relay in the second solar storage module is connected to the negative electrode of the energy storage battery in the second solar storage module, and the normally closed terminal is connected to the positive electrode of the energy storage battery in the third solar storage module;

[0019] The common terminal of the relay in the third photoelectric storage module is connected to the negative electrode of the energy storage battery in the third photoelectric storage module, and the normally closed terminal is connected to the positive electrode of the energy storage battery in the fourth photoelectric storage module;

[0020] The common terminal of the relay in the fourth photo-storage module is connected to the negative electrode of the energy storage battery in the fourth photo-storage module, and the normally closed terminal is connected to the negative electrode of the load.

[0021] Furthermore, the battery discharge protection module has seven ports, namely B+, B-, B1, B2, B3, B4, B5 and P-; wherein the B+ is connected to the positive electrode of the energy storage battery of the first photo-storage module, the B1 is connected to the positive electrode of the energy storage battery of the first photo-storage module, the B2 is connected to the common terminal of the relay of the first photo-storage module, the B3 is connected to the common terminal of the relay of the second photo-storage module, the B4 is connected to the common terminal of the relay of the third photo-storage module, the B5 is connected to the common terminal of the relay of the fourth photo-storage module, and the P- is connected to the positive electrode of the load.

[0022] Furthermore, the battery discharge protection module also includes a chip. Terminals B1 and B2 of the battery discharge protection module are used to measure the voltage of the energy storage battery of the first photovoltaic storage module, terminals B2 and B3 are used to measure the voltage of the energy storage battery of the second photovoltaic storage module, terminals B3 and B4 are used to measure the voltage of the energy storage battery of the third photovoltaic storage module, and terminals B4 and B5 are used to measure the voltage of the energy storage battery of the fourth photovoltaic storage module. When the load is working, current flows from the B+ terminal through the P- terminal to power the chip in the battery discharge protection module. The chip is configured to measure the voltage of each energy storage battery and disconnect the circuit if the voltage of one of the energy storage batteries is lower than the discharge cut-off voltage.

[0023] The beneficial effects of this application are:

[0024] 1. The distributed independent charging photovoltaic storage system provided in this application adopts a solution that matches the voltage between the photovoltaic array and the individual energy storage batteries. This prevents the overcharging of the individual energy storage batteries, avoids the increased cost of using an external overcharge prevention circuit system, and is conducive to improving the safety performance and service life of the energy storage batteries.

[0025] 2. This application can significantly improve the life of energy storage batteries, especially in the long-term service process, it can avoid serious consistency problems of single energy storage batteries caused by the charging process, thereby avoiding a sharp reduction in the service life of the energy storage battery pack;

[0026] 3. The distributed independent charging photovoltaic storage system provided by this application enables each photovoltaic cell string to charge a single energy storage battery. The charging current decreases as the voltage of the energy storage battery increases. In particular, the low current charging at the end of the charging process can extend the battery life.

[0027] 4. The charging module of the energy storage battery group management charging process of the distributed storage independent charging photovoltaic storage system provided in this application does not need to consider the BMS management system, which can greatly save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0029] Figure 1 A structural block diagram of a distributed storage independent charging photovoltaic storage system according to an embodiment of the present application is shown.

[0030] Figure 2 A structural diagram of a photovoltaic storage module in a distributed storage type independent charging photovoltaic storage system according to an embodiment of the present application is shown.

[0031] Figure 3 A circuit topology diagram of a distributed independent charging photovoltaic storage system according to an embodiment of the present application is shown.

[0032] Figure 4 A block diagram of the connections between multiple photovoltaic storage modules in a distributed storage independent charging photovoltaic storage system according to an embodiment of the present application is shown.

[0033] Figure 5 The operating logic diagram of a distributed storage independent charging photovoltaic storage system according to an embodiment of the present application is shown.

[0034] Description of reference numerals:

[0035] 1 - first photovoltaic storage module, 101 - photovoltaic cell string of the first photovoltaic storage module, 102 - light-emitting diode of the first photovoltaic storage module, 103 - energy storage battery of the first photovoltaic storage module, 104 - first relay; S1 - spring of the first relay, M1 - electromagnet of the first relay, S100 - armature of the first relay, S101 - normally closed terminal NC of the first relay, S102 - common terminal COM of the first relay, S103 - normally closed terminal NO of the first relay;

[0036] 2 - second photovoltaic storage module, 201 - photovoltaic cell string of the second photovoltaic storage module, 202 - light-emitting diode of the second photovoltaic storage module, 203 - energy storage battery of the second photovoltaic storage module, 204 - second relay, S2 - spring of the second relay, M2 - electromagnet of the second relay, S200 - armature of the second relay, S201 - normally closed terminal NC of the second relay, S202 - common terminal COM of the second relay, S203 - normally closed terminal NO of the second relay;

[0037] 3 - third photovoltaic storage module, 301 - photovoltaic cell string of the third photovoltaic storage module, 302 - light-emitting diode of the third photovoltaic storage module, 303 - energy storage battery of the third photovoltaic storage module, 304 - third relay, S3 - spring of the third relay, M3 - electromagnet of the third relay, S300 - armature of the third relay, S301 - normally closed terminal NC of the third relay, S302 - common terminal COM of the third relay, S303 - normally closed terminal NO of the third relay;

[0038] 4 - fourth photovoltaic storage module, 401 - photovoltaic cell string of the fourth photovoltaic storage module, 402 - light-emitting diode of the fourth photovoltaic storage module, 403 - energy storage battery of the fourth photovoltaic storage module, 404 - fourth relay, S4 - spring of the fourth relay, M4 - electromagnet of the fourth relay, S400 - armature of the fourth relay, S401 - normally closed terminal NC of the fourth relay, S402 - common terminal COM of the fourth relay, S403 - normally closed terminal NO of the fourth relay;

[0039] 5-Battery discharge protection module;

[0040] 6-Load. DETAILED DESCRIPTION

[0041] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0042] The specific implementation of the present application is further described in detail below with reference to the accompanying drawings and examples.

[0043] The embodiment of the present application provides a distributed storage independent charging and light storage system, such as Figure 1As shown, the system includes multiple photovoltaic storage modules, a battery discharge protection module 5, and a load 6. As an example only, the number of photovoltaic storage modules is set to four, namely a first photovoltaic storage module 1, a second photovoltaic storage module 2, a third photovoltaic storage module 3, and a fourth photovoltaic storage module 4. It should be noted that the specific number of photovoltaic storage modules mentioned above is merely an example and is not a limitation of the present application. In other embodiments, the number of photovoltaic storage modules may also be other, such as two, three, five, eight, etc.

[0044] The structure of each photovoltaic storage module is the same or similar, and is composed of a storage battery connected to a photovoltaic cell string, a light-emitting diode and a relay.

[0045] like Figure 2 As shown, the positive electrode of the photovoltaic cell string 101 in the first photovoltaic storage module 1 is first connected to the anode of the light-emitting diode 102, the cathode of the light-emitting diode 102 is then connected to the positive electrode of the energy storage battery 103, the negative electrode of the energy storage battery 103 is then connected to the control side of the first relay 104, and finally the control side of the first relay 104 is connected to the negative electrode of the photovoltaic cell string 101. The connection method of the photovoltaic cell strings, light-emitting diodes, energy storage batteries, and relays in the second photovoltaic storage module 2, the third photovoltaic storage module 3, and the fourth photovoltaic storage module 4 is the same as that of the first photovoltaic storage module 1.

[0046] In some embodiments, the photovoltaic cell string in each photovoltaic storage module is composed of two 60×60 mm polycrystalline solar photovoltaic cells with an open circuit voltage of 2.1 V and a short circuit current of 0.146 A connected in series.

[0047] It should be noted that the functions of the photovoltaic cell strings in each photovoltaic storage module are basically the same, but their performance and size parameters can be consistent or different. In this embodiment, the use of photovoltaic cell strings with the same performance and size parameters in each photovoltaic storage module is only an example and not a limitation of this application.

[0048] In some embodiments, the energy storage battery in each photovoltaic storage module is a 14500 lithium iron phosphate No. 5 battery with a capacity of 400mAh, a charging cut-off voltage of 3.7V, and a discharging cut-off voltage of 2.0V.

[0049] It should be noted that the functions of the energy storage batteries in each photovoltaic storage module are basically the same, but their performance parameters can be consistent or different. In this embodiment, the use of energy storage batteries with the same performance parameters in each photovoltaic storage module is only an example and not a limitation of this application.

[0050] In some embodiments, as Figure 3 and Figure 4As shown, the common terminal S102 of the first relay 104 is connected to the negative electrode of the energy storage battery 103 in the first photovoltaic storage module 1, and the normally closed terminal S101 is connected to the positive electrode of the energy storage battery 203 in the second photovoltaic storage module 2; the common terminal S202 of the second relay 204 is connected to the negative electrode of the energy storage battery 203 in the second photovoltaic storage module 2, and the normally closed terminal S201 is connected to the positive electrode of the energy storage battery 303 in the third photovoltaic storage module 3; the common terminal S302 of the third relay 304 is connected to the negative electrode of the energy storage battery 303 in the third photovoltaic storage module 3, and the normally closed terminal S301 is connected to the positive electrode of the energy storage battery 403 in the fourth photovoltaic storage module 4; the common terminal S402 of the fourth relay 404 is connected to the negative electrode of the energy storage battery 403 in the fourth photovoltaic storage module 4, and the normally closed terminal S401 is connected to the negative electrode of the load.

[0051] Taking the first photovoltaic storage module 1 as an example, when light is irradiated on the first photovoltaic storage module 1, the photovoltaic cell string 101 generates current, and the current generates magnetic force through the electromagnet M1 on the control side of the first relay 104, which attracts the armature S100 to close downward, thereby disconnecting the normally closed end S101 from the common end S102, and closing the common end S102 to the normally open end S103. When light is irradiated on the second photovoltaic storage module 2, the third photovoltaic storage module 3, and the fourth photovoltaic storage module 4, the internal processes are consistent, so that when light is irradiated, the photovoltaic cell string in each photovoltaic storage module independently charges the energy storage battery.

[0052] The working principles of other optical storage modules (the second optical storage module 2 , the third optical storage module 3 and the fourth optical storage module 4 ) are basically the same as the working principle of the first optical storage module 1 , and therefore are not described in detail here.

[0053] In some embodiments, the photovoltaic cell string has an output voltage of 3.75V and an output current of 0.125A when irradiated by sunlight.

[0054] In some embodiments, the output voltage of the photovoltaic cell string when exposed to sunlight is 3.75V, which is slightly higher than the charging cut-off voltage of the energy storage battery of 3.7V. Since the lithium iron phosphate battery can be normally charged and discharged between 3.7 and 4.0V and the impact on the capacity life can be ignored, the voltage matching between the two will not cause the energy storage battery to overcharge. At the same time, the charging current will decrease with the increase of voltage, which is in line with the battery charging law.

[0055] In some embodiments, as Figure 3As shown, terminals B1 and B2 of the battery discharge protection module 5 measure the voltage of energy storage battery 103 of the first photovoltaic storage module, terminals B2 and B3 measure the voltage of energy storage battery 203 of the second photovoltaic storage module, terminals B3 and B4 measure the voltage of energy storage battery 303 of the third photovoltaic storage module, and terminals B4 and B5 measure the voltage of energy storage battery 403 of the fourth photovoltaic storage module. When load 6 is operating, current flows from B+ through P- to power the chips in the battery discharge protection module and, by measuring the voltage of each energy storage battery, ensure that the battery pack does not over-discharge during use. Specifically, if the voltage of any energy storage battery falls below 2.10V, the battery discharge protection module disconnects the circuit.

[0056] Please combine Figures 1 to 5 As shown, the working principle of the independent charging and solar storage system provided by this embodiment is as follows:

[0057] The photovoltaic storage module is the main body of the system. When light is irradiated on the first photovoltaic storage module 1, the second photovoltaic storage module 2, the third photovoltaic storage module 3, and the fourth photovoltaic storage module 4, the photovoltaic cell string 101 in the first photovoltaic storage module 1 generates current, and the current generates magnetic force through the electromagnet M1 on the control side of the first relay 104, which attracts the armature S100 to close downward, thereby disconnecting the normally closed end S101 from the common end S102, and closing the common end S102 to the normally open end S103; the photovoltaic cell string 201 in the second photovoltaic storage module 2 generates current, and the current generates magnetic force through the electromagnet M2 on the control side of the first relay 204, which attracts the armature S200 to close downward, thereby disconnecting the normally closed end S201 from the common end S202, and closing the common end S202 to the normally open end S203; the photovoltaic cell string 201 in the third photovoltaic storage module 3 generates current, and the current generates magnetic force through the electromagnet M2 on the control side of the first relay 204, which attracts the armature S200 to close downward, thereby disconnecting the normally closed end S201 from the common end S202, and closing the common end S202 to the normally open end S203. 301 generates current, which generates magnetic force through the electromagnet M3 on the control side of the first relay 304, attracting the armature S300 to close downward, thereby disconnecting the normally closed end S301 from the common end S302, and closing the common end S302 to the normally open end S303; the photovoltaic cell string 401 in the fourth photovoltaic storage module 4 generates current, which generates magnetic force through the electromagnet M4 on the control side of the first relay 404, attracting the armature S400 to close downward, thereby disconnecting the normally closed end S401 from the common end S402, and closing the common end S402 to the normally open end S403; therefore, when there is light irradiation, the photovoltaic cell strings in each photovoltaic storage module independently charge the energy storage battery, and the voltage matching between the two will not cause overcharging of the energy storage battery. At the same time, the charging current will decrease with the increase of voltage, which is in line with the battery charging law.

[0058] When no light is irradiated on the first photovoltaic storage module 1, the second photovoltaic storage module 2, the third photovoltaic storage module 3, and the fourth photovoltaic storage module 4, the photovoltaic cell string 101 in the first photovoltaic storage module 1 does not generate current, the electromagnet M1 on the control side of the first relay 104 does not generate magnetic force, the armature S100 is in its original position and is not attracted to close with the electromagnet, thereby closing the normally closed end S101 and the common end S102, and disconnecting the common end S102 from the normally open end S103; the photovoltaic cell string 201 in the second photovoltaic storage module 2 does not generate current, the electromagnet M2 on the control side of the first relay 204 does not generate magnetic force, the armature S200 is in its original position and is not attracted to close with the electromagnet, thereby closing the normally closed end S201 and the common end S202, and disconnecting the common end S202 from the normally open end S203; The battery string 301 does not generate current, the electromagnet M3 on the control side of the first relay 304 does not generate magnetic force, the armature S300 is in its original position and is not attracted to close with the electromagnet, thereby closing the normally closed end S301 and the common end 302, and disconnecting the common end S302 from the normally open end S303; the photovoltaic battery string 401 in the fourth photovoltaic storage module 4 does not generate current, the electromagnet M4 on the control side of the first relay 404 does not generate magnetic force, the armature S400 is in its original position and is not attracted to close with the electromagnet, thereby closing the normally closed end S401 and the common end S402, and disconnecting the common end S402 from the normally open end S403; therefore, when there is no light irradiation, the energy storage batteries of the first photovoltaic storage module 1, the second photovoltaic storage module 2, the third photovoltaic storage module 3, and the fourth photovoltaic storage module 4 are connected in series as a total power supply to supply power to the load.

[0059] When the load is working, the battery discharge protection module 5 monitors the voltage of the energy storage batteries of the first photovoltaic storage module 1, the second photovoltaic storage module 2, the third photovoltaic storage module 3, and the fourth photovoltaic storage module 4. When the voltage of a certain energy storage battery is lower than 2.10V, the circuit is disconnected to prevent over-discharge of the energy storage battery.

[0060] It should be noted that the energy storage battery described in the above embodiments is not limited to a certain type of battery, such as lithium iron phosphate battery, ternary lithium battery or lead-acid battery. It is only necessary to adjust the number of photovoltaic strings and the discharge protection module according to the charging cut-off voltage of different types of energy storage batteries. The embodiments of the present application do not limit their specific types.

[0061] In summary, the distributed storage type independent charging photovoltaic storage system of this embodiment is characterized by adopting independent charging with voltage matching between photovoltaic and energy storage batteries. The voltage matching between the two will not cause overcharging of the energy storage battery. At the same time, the charging current will decrease with the increase of voltage, which is in line with the battery charging law, thereby realizing efficient and safe photovoltaic power generation and energy storage, avoiding overcharging on the energy storage battery side and inconsistency problems between batteries, and improving battery life and enhancing safety.

[0062] In summary, this application provides a discrete, simple photovoltaic-storage system by innovating the connection between photovoltaic cells and energy storage batteries. This system features a simple structure, low cost, long service life, and high safety. It achieves efficient and safe photovoltaic power generation and energy storage by matching the voltages of the photovoltaic and energy storage batteries and charging them independently.

[0063] The above implementation modes are only used to illustrate the present application and are not intended to limit the present application. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present application. Therefore, all equivalent technical solutions also fall within the scope of the present application, and the scope of patent protection of the present application shall be defined by the claims.

Claims

1. A distributed independent charging and solar storage system, characterized in that: Includes multiple photovoltaic storage modules, battery discharge protection modules and loads; A plurality of photovoltaic storage modules are connected in sequence, each of the plurality of photovoltaic storage modules is electrically connected to the battery discharge protection module, and the load is provided on the electrical connection line between the battery discharge protection module and the plurality of photovoltaic storage modules; The photovoltaic storage module includes a photovoltaic cell string, an energy storage battery, a light-emitting diode and a relay; wherein the photovoltaic cell string, the energy storage battery, the light-emitting diode and the relay are connected in series.

2. The independent charging and solar storage system according to claim 1, characterized in that: The photovoltaic cell string includes at least two single photovoltaic cells connected in series.

3. The independent charging and solar storage system according to claim 1, characterized in that: The energy storage battery is one of a lithium ferrous phosphate battery, a ternary lithium battery, a lead-acid battery, and a combination thereof.

4. The independent charging and solar storage system according to claim 1, characterized in that: When the photovoltaic cell string is exposed to sunlight, the output voltage thereof is equal to the charging cut-off voltage of the energy storage battery within a set error range.

5. The independent charging and solar storage system according to claim 1, characterized in that: The relay has a control side and a switch side; wherein the control side contains an electromagnet switch, and the switch side is divided into three ports, namely a common port, a normally closed port, and a normally open port.

6. The independent charging and solar storage system according to any one of claims 1 to 5, characterized in that: The positive electrode of the photovoltaic cell string is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is connected to the positive electrode of the energy storage battery, the negative electrode of the energy storage battery is connected to the control side of the relay, and the control side of the relay is connected to the negative electrode of the photovoltaic cell string.

7. The independent charging and solar storage system according to claim 5, characterized in that: There are four optical storage modules, namely a first optical storage module, a second optical storage module, a third optical storage module and a fourth optical storage module; The common terminal of the relay of the first solar storage module is connected to the negative electrode of the energy storage battery in the first solar storage module, and the normally closed terminal is connected to the positive electrode of the energy storage battery in the second solar storage module; The common terminal of the relay in the second solar storage module is connected to the negative electrode of the energy storage battery in the second solar storage module, and the normally closed terminal is connected to the positive electrode of the energy storage battery in the third solar storage module; The common terminal of the relay in the third photoelectric storage module is connected to the negative electrode of the energy storage battery in the third photoelectric storage module, and the normally closed terminal is connected to the positive electrode of the energy storage battery in the fourth photoelectric storage module; The common terminal of the relay in the fourth photo-storage module is connected to the negative electrode of the energy storage battery in the fourth photo-storage module, and the normally closed terminal is connected to the negative electrode of the load.

8. The independent charging and solar storage system according to claim 7, characterized in that: The battery discharge protection module has seven ports, namely B+, B-, B1, B2, B3, B4, B5 and P-; among them, the B+ terminal is connected to the positive electrode of the energy storage battery of the first photo-storage module, the B1 terminal is connected to the positive electrode of the energy storage battery of the first photo-storage module, the B2 terminal is connected to the common terminal of the relay of the first photo-storage module, the B3 terminal is connected to the common terminal of the relay of the second photo-storage module, the B4 terminal is connected to the common terminal of the relay of the third photo-storage module, the B5 terminal is connected to the common terminal of the relay of the fourth photo-storage module, and the P- terminal is connected to the positive electrode of the load.

9. The independent charging and solar storage system according to claim 8, characterized in that: The battery discharge protection module further includes a chip, wherein terminals B1 and B2 of the battery discharge protection module are used to measure the voltage of the energy storage battery of the first photovoltaic storage module, terminals B2 and B3 are used to measure the voltage of the energy storage battery of the second photovoltaic storage module, terminals B3 and B4 are used to measure the voltage of the energy storage battery of the third photovoltaic storage module, and terminals B4 and B5 are used to measure the voltage of the energy storage battery of the fourth photovoltaic storage module; When the load is working, current flows from the B+ terminal through the P- terminal to power the chip in the battery discharge protection module. The chip is configured to measure the voltage of each energy storage battery and disconnect the circuit if the voltage of one of the energy storage batteries is lower than the discharge cut-off voltage.

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