Lithium battery optical storage off-grid system

Abstract

The utility model relates to the technical field of power electronic converters, in particular to a lithium battery optical storage off-grid system. Comprising a battery bin, a heater and a lithium battery are at least arranged in the battery bin, the lithium battery comprises a battery pack and a BMU battery management unit, the positive electrode and the negative electrode of the battery pack are connected with the direct current end of a light storage converter, and the alternating current end of the light storage converter is connected with the power input end of the heater; the heater is further connected with the off-grid photovoltaic inverter, the off-grid photovoltaic inverter is connected with the photovoltaic battery, and the heater is integrated in the battery bin, so that the working temperature of the lithium battery can be kept in a cold environment, and the good charging and discharging performance of the lithium battery can still be kept under the low-temperature condition. And the light storage converter not only is responsible for converting direct current stored in the battery into alternating current to be used by the heater, but also can cooperatively work with the off-grid photovoltaic inverter to realize conversion and storage from solar energy to electric energy, so that the whole system can independently operate without an external power supply.

Description

Technical Field

[0001] This invention relates to the field of power electronic converter technology, and particularly to a lithium battery photovoltaic energy storage off-grid system. Background Technology

[0002] The lithium battery BMU is powered by a traditional UPS. The UPS typically operates between 0-40℃. Ordinary lithium battery systems allow cell temperatures above -20℃ to discharge and above 0℃ to charge. The UPS cannot function properly at low temperatures, and the lithium battery is also not permitted to operate. In such cases, heating is required for the lithium battery system and the UPS compartment. The current startup method involves using a diesel generator to power the heater at low temperatures. Once the lithium battery compartment temperature reaches the required level, the UPS needs to be manually turned on. After the lithium battery BMU is powered, the battery high-voltage box closes, and the energy storage converter automatically starts off-grid. The converter outputs AC power, at which point the diesel generator can be stopped, and the AC output of the energy storage converter continues to power the heater and battery BMU. This method requires a diesel generator, and the UPS's built-in lead-acid battery will also fail if left unmaintained for extended periods, leading to abnormal power supply to the lithium battery system. Utility Model Content

[0003] This invention proposes a lithium battery photovoltaic energy storage off-grid system, which aims to solve the problems of relying on diesel generators for power supply and the difficulty of maintaining the lead-acid batteries built into the UPS in traditional methods.

[0004] To achieve the above objectives, this invention proposes an off-grid lithium battery photovoltaic energy storage system for use in low-temperature environments, comprising: a battery compartment, which contains at least a heater and a lithium battery, wherein the lithium battery includes: a battery pack and a battery management unit (BMU); the positive and negative terminals of the battery pack are connected to the DC terminal of a photovoltaic energy storage converter, and the AC terminal of the photovoltaic energy storage converter is connected to the power input terminal of the heater, for converting the DC power stored in the battery pack into AC power for use by the heater; the heater is also connected to an off-grid photovoltaic inverter, which is connected to a photovoltaic system, which captures solar energy and converts it into DC power.

[0005] Preferably, the output of the off-grid photovoltaic inverter is connected to a heater and a BMU battery management unit.

[0006] Preferably, the power range of the off-grid photovoltaic inverter is configured between 500W and 2000W.

[0007] Preferably, the output terminal of the photovoltaic system is connected to the photovoltaic-storage converter and the off-grid photovoltaic inverter.

[0008] Preferably, the AC terminal of the photovoltaic-storage converter is connected to the heater and the BMU battery management unit.

[0009] Preferably, the battery pack is connected to the DC terminal of the photovoltaic-storage converter via a BMU (Battery Management Unit) for monitoring and managing the charging and discharging process, temperature control, and voltage balance of the battery pack.

[0010] Preferably, the system also includes a controller for monitoring and controlling the operating status of the system, including parameters such as the charging and discharging status of the battery, temperature, and voltage, and adjusting the power and operating time of the heater as needed.

[0011] Preferably, the controller is an STM32F407VGT6 microcontroller.

[0012] The beneficial effects of the technical solution of this invention are as follows:

[0013] By integrating a heater within the battery compartment, the lithium battery can maintain its operating temperature in cold environments, ensuring good charge and discharge performance even at low temperatures. Simultaneously, the photovoltaic-storage converter not only converts the DC power stored in the battery into AC power to supply the heater, but also works in conjunction with an off-grid photovoltaic inverter to achieve the conversion and storage of solar energy into electrical energy, enabling the entire system to operate independently without an external power source.

[0014] By adopting an off-grid photovoltaic power generation method, the system's applicability is further improved, enabling it to adapt to various geographical and climatic conditions. Especially in areas with abundant sunshine, it can fully leverage the advantages of solar energy and reduce dependence on traditional energy sources. Simultaneously, the system's modular design allows for easy expansion of battery capacity or addition of more photovoltaic panels as needed to meet different energy demands and application scenarios.

[0015] By controlling the inverter's power range between 500W and 2000W, the system allows for flexible adjustment of power distribution based on actual needs. Specifically, during periods of ample sunlight, power can be prioritized for heater 200 to maintain the temperature within the battery compartment; conversely, during periods of insufficient solar energy or at night, the energy stored in battery pack 400 can be used to drive the heater, ensuring the batteries operate at their optimal temperature. The Battery Management Unit (BMU) monitors the charging and discharging process of the battery pack in real time, ensuring optimized charging and discharging strategies to prevent overcharging and over-discharging, thereby extending battery life. Furthermore, in low-temperature environments, the BMU intelligently adjusts the heater's operating status based on battery pack temperature data, ensuring the temperature within the battery compartment remains within a suitable range, thus protecting the performance and lifespan of the lithium batteries. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the existing technology;

[0017] Figure 2This is a structural schematic diagram of an embodiment of the subject matter of this invention;

[0018] Figure 3 This is a schematic diagram illustrating the specific structure of an embodiment of the subject matter of this invention;

[0019] Figure 4 This is a structural schematic diagram of one or more embodiments of the subject matter of this invention;

[0020] Figure 5 This is a schematic diagram of the specific structure of one or more embodiments of the subject matter of this invention;

[0021] Figure 6 This is a schematic diagram illustrating a specific structure of another embodiment of the subject matter of this invention.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0026] Furthermore, descriptions using terms such as "first" and "second" in this invention are for descriptive purposes only (e.g., to distinguish identical or similar elements) and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of those features. Additionally, technical solutions from different embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this invention.

[0027] refer to Figures 1-3 This invention proposes an off-grid lithium battery photovoltaic energy storage system, comprising: a battery compartment 100, wherein the battery compartment 100 includes at least a heater 200 and a lithium battery 300, wherein the lithium battery 300 includes: a battery pack 400 and a battery management unit 500, wherein the positive and negative terminals of the battery pack 400 are connected to the DC terminal of a photovoltaic energy storage converter 600, and the AC terminal of the photovoltaic energy storage converter 600 is connected to the power input terminal of the heater 200, for converting the DC power stored in the battery pack 400 into AC power for use by the heater 200, wherein the heater 200 is also connected to an off-grid photovoltaic inverter 700, and the off-grid photovoltaic inverter 700 is connected to a photovoltaic 800, wherein the photovoltaic 800 is used to capture solar energy and convert it into DC power.

[0028] In this solution, a heater 200 is integrated into the battery compartment 100 to maintain the operating temperature of the lithium battery 300 in cold environments, ensuring good charge and discharge performance even at low temperatures. Simultaneously, the photovoltaic-storage inverter 600 not only converts the DC power stored in the battery into AC power for the heater 200, but also works in conjunction with the off-grid photovoltaic inverter 700 to achieve the conversion and storage of solar energy into electrical energy. This allows the entire system to operate independently without an external power source, making it suitable for energy needs in remote areas or emergencies. Through the battery management unit 500 (BMU), the system can monitor the status of the battery pack 400 in real time, including key parameters such as voltage, current, and temperature, and adjust the heater's power and operating time accordingly, as well as control the battery's charging and discharging process.

[0029] Furthermore, the off-grid photovoltaic power generation system expands its applicability, enabling it to adapt to various geographical and climatic conditions. Especially in sunny regions, it fully leverages the advantages of solar energy, reducing reliance on traditional energy sources. Simultaneously, the system's modular design allows for easy expansion of battery capacity or addition of more photovoltaic panels to meet diverse energy demands and application scenarios.

[0030] Compared to existing technologies, this solution eliminates the need for traditional power generation devices, simplifies the overall system structure, reduces the number of external wiring and components, lowers system complexity and failure rate, reduces installation and maintenance complexity, and reduces initial investment and operating costs.

[0031] In one embodiment, the output of the off-grid photovoltaic inverter 700 is connected to the heater 200 and the BMU battery management unit 500, and the power range of the off-grid photovoltaic inverter 700 is configured between 500W and 2000W.

[0032] In this solution, by controlling the inverter's power range between 500W and 2000W, the system is allowed to flexibly adjust the power distribution according to actual needs.

[0033] Specifically, when there is ample sunlight, power can be prioritized for the heater 200 to maintain the temperature inside the battery compartment; while when solar energy is insufficient or at night, the electrical energy stored in the battery pack 400 can be used to drive the heater, ensuring the battery is at its optimal operating temperature. Through the intelligent control of the BMU battery management unit 500, the system can monitor battery status and energy flow in real time, avoiding risks such as overcharging and over-discharging, thereby extending battery life and improving the stability and reliability of the entire system.

[0034] refer to Figures 4-6 In one embodiment, the output terminal of the photovoltaic 800 is connected to the photovoltaic-storage converter 600 and the off-grid photovoltaic inverter 700.

[0035] In this solution, by directly connecting the output of the photovoltaic 800 to the photovoltaic-storage converter 600 and the off-grid photovoltaic inverter 700, efficient conversion and storage of solar energy into electrical energy are achieved. Under sufficient sunlight, the DC power generated by the photovoltaic 800 can be directly converted to AC power by the photovoltaic-storage converter 600 to power the heater 200. Excess electrical energy can be stored in the battery pack 400 for unforeseen needs. Furthermore, when solar energy is insufficient or at night, the electrical energy stored in the battery pack 400 can be converted back to AC power by the photovoltaic-storage converter 600 to power the heater 200, ensuring stable system operation under various conditions.

[0036] In one embodiment, the AC terminal of the photovoltaic-storage converter 600 is connected to the heater 200 and the BMU battery management unit 500.

[0037] In this solution, by connecting the AC terminal of the photovoltaic energy storage converter 600 to the heater 200 and the BMU battery management unit 500, the power management and control of the system are further optimized.

[0038] The photovoltaic-storage converter 600 is responsible for converting the DC power generated by the photovoltaic 800 into AC power for the heater 200, and also for converting the DC power stored in the battery pack 400 into AC power when solar energy is insufficient or at night.

[0039] In one embodiment, the battery pack 400 is connected to the DC terminal of the photovoltaic-storage converter 600 via a BMU battery management unit 500 for monitoring and managing the charging and discharging process, temperature control, and voltage balance of the battery pack 400.

[0040] In this solution, the BMU (Battery Management Unit) 500 can monitor the charging and discharging process of the battery pack 400 in real time, ensuring that the batteries are charged and discharged according to optimized strategies, avoiding overcharging and over-discharging, thereby extending battery life. Simultaneously, in low-temperature environments, the BMU 500 intelligently adjusts the operating status of the heater 200 based on the temperature data of the battery pack 400, ensuring that the temperature inside the battery compartment is always maintained within a suitable range, guaranteeing the performance and lifespan of the lithium batteries. It also has a voltage balancing function, capable of monitoring and adjusting the voltage of each individual cell in the battery pack 400, ensuring that the voltage of each battery cell remains consistent, preventing battery damage or performance degradation caused by voltage imbalance.

[0041] In one embodiment, the system further includes a controller for monitoring and controlling the operating status of the system, including parameters such as the charge / discharge status of the battery, temperature, and voltage, and adjusting the power and operating time of the heater 200 as needed.

[0042] Specifically, when the ambient temperature is below a set threshold, the controller activates the heater 200 to heat the battery compartment 100 while simultaneously monitoring battery temperature changes. Once the battery temperature reaches a suitable operating range, the controller automatically adjusts the heater power to maintain the battery temperature at the ideal level. Furthermore, the controller can intelligently schedule the charging and discharging process of the energy storage battery based on the battery's charging and discharging status and grid demand, ensuring the system's efficient and stable operation.

[0043] Furthermore, to improve the system's response speed and processing capabilities, the controller uses an STM32F407VGT6 microcontroller, which can process data from multiple sensors in real time and make quick decisions based on preset algorithms, thereby ensuring the stable operation and high efficiency of the energy storage system.

[0044] The system also includes a user interface that allows operators to monitor the status of the energy storage system, including key parameters such as battery charge / discharge status, temperature, and voltage. The user interface can also display historical data and trend charts to help operators analyze system performance and make necessary adjustments. The above descriptions are only some or preferred embodiments of the present invention. Neither the text nor the accompanying drawings should limit the scope of protection of the present invention. Any equivalent structural transformations made using the content of the specification and drawings within the overall concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A lithium battery light storage off-grid system characterized in that: The system comprises a battery compartment (100) having at least a heater (200) and a lithium battery (300) therein, the lithium battery (300) comprising a battery pack (400) and a BMU battery management unit (500), the positive and negative poles of the battery pack (400) being connected to the direct current end of a light storage inverter (600), the alternating current end of the light storage inverter (600) being connected to the power input end of the heater (200) for converting the direct current stored by the battery pack (400) into alternating current for use of the heater (200), the heater (200) being further connected to an off-grid photovoltaic inverter (700), the off-grid photovoltaic inverter (700) being connected to a photovoltaic (800) for capturing solar energy and converting it into direct current.

2. The lithium battery optical storage off-grid system according to claim 1, characterized in that, The output end of the off-grid photovoltaic inverter (700) is connected to the heater (200) and the BMU battery management unit (500).

3. The lithium battery optical storage off-grid system according to claim 2, characterized in that, The power range of the off-grid photovoltaic inverter (700) is configured to be between 500W and 2000W.

4. The lithium battery optical storage off-grid system according to claim 1, characterized in that, The output end of the photovoltaic (800) is connected to the light storage inverter (600) and the off-grid photovoltaic inverter (700).

5. The lithium battery optical storage off-grid system according to claim 1, characterized in that, The alternating current end of the light storage inverter (600) is connected to the heater (200) and the BMU battery management unit (500).

6. The lithium battery optical storage off-grid system according to claim 1, characterized in that, The battery pack (400) is connected to the direct current end of the light storage inverter (600) through the BMU battery management unit (500) for monitoring and managing the charging and discharging process, temperature control and voltage balance of the battery pack (400).

7. The lithium battery optical storage off-grid system according to claim 1, characterized in that: The system further comprises a controller for monitoring and controlling the operating state of the system, including the charging and discharging state, temperature and voltage of the battery, and adjusting the power and working time of the heater (200) as needed.

8. The lithium battery optical storage off-grid system according to claim 7, characterized in that: The controller adopts an STM32F407VGT6 microcontroller.

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