Photovoltaic energy storage device

Abstract

The utility model provides a photovoltaic energy storage device, which relates to the technical field of energy storage and comprises a shell with a first accommodating cavity and a second accommodating cavity, and the accommodating space of the first accommodating cavity is larger than that of the second accommodating cavity; the battery module is used for storing electric energy and is arranged in the first accommodating cavity; the BMS module is arranged in the second accommodating cavity, and the BMS module is electrically connected with the battery module through a wire harness so as to collect electric quantity information of the battery module; the MPPT module is arranged in the second containing cavity, and the MPPT module is electrically connected with the photovoltaic power generation device through a wire harness so as to monitor the generated power of the photovoltaic power generation device; the energy storage control module is arranged in the second containing cavity, the energy storage control module is electrically connected with the BMS module through a wire harness so as to obtain electric quantity information, and the energy storage control module is further electrically connected with the MPPT module through a wire harness so as to obtain generated power. The situation that power supply and demand are not matched due to the fact that photovoltaic energy is directly connected to load equipment and / or a power grid is reduced, and the power supply and demand relation is balanced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a photovoltaic energy storage device. Background Art

[0002] In the context of global energy transformation and sustainable development, photovoltaic power generation, as a clean, pollution-free new energy source, is gaining increasing attention and being rapidly promoted. Photovoltaic systems provide electricity for homes, industries and public facilities by directly converting solar energy into electrical energy.

[0003] Traditional power systems rely on fossil fuel generators, which have high dispatch flexibility and can quickly adjust output according to changes in demand. However, due to the intermittent and volatile nature of photovoltaic power generation, which is significantly affected by climate conditions and the alternation of day and night, when photovoltaic energy is connected to the grid, power supply and demand are prone to mismatch. Utility Model Content

[0004] The main purpose of the utility model is to provide a photovoltaic energy storage device, aiming to solve the problem of mismatch between power supply and demand.

[0005] To achieve the above object, the utility model provides a photovoltaic energy storage device, comprising:

[0006] A housing, the housing comprising a first accommodating chamber and a second accommodating chamber, wherein the accommodating space of the first accommodating chamber is larger than the accommodating space of the second accommodating chamber;

[0007] A battery module, the battery module is used to store electric energy, and the battery module is arranged in the first accommodating cavity;

[0008] A battery management system BMS module is disposed in the second accommodating cavity, and the BMS module is electrically connected to the battery module through a wiring harness to collect power information of the battery module;

[0009] A maximum power point tracking (MPPT) module is disposed in the second accommodating cavity, and the MPPT module is electrically connected to the photovoltaic power generation device through a wiring harness to monitor the power generation of the photovoltaic power generation device;

[0010] An energy storage control module is arranged in the second accommodating cavity, the energy storage control module is electrically connected to the BMS module through a wiring harness to obtain the power information, and the energy storage control module is also electrically connected to the MPPT module through a wiring harness to obtain the generated power;

[0011] When the power information indicates that the power of the battery module is less than or equal to the first power threshold, and the generated power is greater than the first power threshold, the energy storage control module controls the photovoltaic power generation device to charge the battery module.

[0012] Optionally, the energy storage control module is also electrically connected to the power grid via a wiring harness;

[0013] When the power information indicates that the power of the battery module is less than or equal to the first power threshold, and the generated power is less than or equal to the first power threshold, the energy storage control module controls the power grid to charge the battery module;

[0014] When the power information indicates that the power of the battery module is greater than the first power threshold, the energy storage control module controls the battery module to discharge to the power grid.

[0015] Optionally, the energy storage control module includes an energy storage inverter PCS module, a DC circuit breaker and an AC circuit breaker, the BMS module and the MPPT module are electrically connected to the PCS module through a wiring harness, respectively, the battery module is electrically connected to the photovoltaic power generation device through the DC circuit breaker, and the battery module is electrically connected to the power grid through the AC circuit breaker.

[0016] Optionally, the energy storage control module further includes a bidirectional converter, and the bidirectional converter is arranged between the battery module and the photovoltaic power generation device, and between the battery module and the power grid.

[0017] Optionally, it further includes input and output terminals, which are arranged between the battery module and the photovoltaic power generation device, and between the battery module and the power grid.

[0018] Optionally, an aerogel thermal insulation coating is applied on the shell.

[0019] Optionally, the battery module includes a plurality of battery modules arranged in an array, and the plurality of battery modules are arranged at intervals.

[0020] Optionally, a first ventilation and heat dissipation module and a second ventilation and heat dissipation module are further provided on the shell, the first ventilation and heat dissipation module is located in a region corresponding to the first accommodating cavity, and the second ventilation and heat dissipation module is located in a region corresponding to the second accommodating cavity.

[0021] Optionally, the first ventilation and heat dissipation module is electrically connected to the BMS module via a wiring harness, and the output power of the first ventilation and heat dissipation module is proportional to the charging power or discharging power of the battery module.

[0022] Optionally, a first handle and a second handle are further provided on the shell, the first handle is arranged opposite to the second handle, and the first handle is located in a region corresponding to the first accommodating cavity, and the second handle is located in a region corresponding to the second accommodating cavity.

[0023] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0024] In the embodiment of the utility model, a photovoltaic energy storage device is provided, and the photovoltaic power generation device can be connected to the power grid through the photovoltaic energy storage device. When the BMS module monitors that the power of the battery module is less than or equal to the first power threshold, it can be indicated that the battery module is in a state of insufficient power and the battery module needs to be charged. At this time, the power generation power of the photovoltaic power generation device can be monitored by the MPPT module. When the power generation power is greater than the first power threshold, it can be indicated that the photovoltaic power generation device has a high photoelectric conversion efficiency. The photovoltaic power generation device can be controlled by the energy storage control module to charge the battery module, thereby reducing the situation where the power generation power of the photovoltaic power generation device is insufficient and causes power supply fluctuations. When the BMS module monitors that the power of the battery module is greater than the first power threshold, it can be indicated that the battery module is in a state of sufficient power. At this time, the battery module can be controlled by the energy storage control module to discharge the load device and / or the power grid. In this way, through the monitoring function of the BMS module and the MPPT module, the power supply and storage status can be determined in real time, and the photovoltaic power generation device can store the electrical energy converted from light energy in the battery module, and then discharge the load device and / or the power grid according to the power information of the battery module, thereby reducing the situation where the photovoltaic energy is directly connected to the load device and / or the power grid, resulting in a mismatch between power supply and demand, and balancing the power supply and demand relationship. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is one of the structural schematic diagrams of a photovoltaic energy storage device provided by an embodiment of the utility model;

[0027] Figure 2 This is the second structural schematic diagram of a photovoltaic energy storage device provided by an embodiment of the utility model;

[0028] Figure 3 This is the third structural schematic diagram of a photovoltaic energy storage device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0029] All technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0032] The present utility model provides a photovoltaic energy storage device, such as Figures 1 to 3 As shown, the photovoltaic energy storage device includes:

[0033] The housing 10 comprises a first accommodating chamber and a second accommodating chamber, wherein the accommodating space of the first accommodating chamber is larger than the accommodating space of the second accommodating chamber;

[0034] A battery module 20, the battery module 20 is used to store electric energy, and the battery module 20 is disposed in the first accommodating cavity;

[0035] A battery management system (BMS) module 30 is disposed in the second accommodation cavity, and the BMS module 30 is electrically connected to the battery module 20 through a wiring harness to collect power information of the battery module 20;

[0036] A maximum power point tracking (MPPT) module 40 is disposed in the second accommodating cavity. The MPPT module 40 is electrically connected to the photovoltaic power generation device through a wiring harness to monitor the power generation of the photovoltaic power generation device.

[0037] An energy storage control module is disposed in the second accommodating cavity, the energy storage control module is electrically connected to the BMS module 30 through a wiring harness to obtain the power information, and the energy storage control module is also electrically connected to the MPPT module 40 through a wiring harness to obtain the generated power;

[0038] When the power information indicates that the power of the battery module is less than or equal to the first power threshold, and the generated power is greater than the first power threshold, the energy storage control module controls the photovoltaic power generation device to charge the battery module 20 .

[0039] In an embodiment of the utility model, a photovoltaic energy storage device is provided, and a photovoltaic power generation device can be connected to the power grid through the photovoltaic energy storage device. When the BMS module 30 monitors that the power of the battery module 20 is less than or equal to the first power threshold, it can indicate that the battery module 20 is in a state of insufficient power and the battery module 20 needs to be charged. At this time, the power generation power of the photovoltaic power generation device can be monitored by the MPPT module 40. When the power generation power is greater than the first power threshold, it can indicate that the photovoltaic power generation device has a high photoelectric conversion efficiency. The photovoltaic power generation device can be controlled by the energy storage control module to charge the battery module 20, thereby reducing the power supply fluctuation caused by insufficient power generation of the photovoltaic power generation device. When the BMS module 30 monitors that the power of the battery module 20 is greater than the first power threshold, it can indicate that the battery module 20 is in a state of sufficient power. At this time, the battery module 20 can be controlled by the energy storage control module to discharge the load device and / or the power grid. In this way, through the monitoring function of the BMS module 30 and the MPPT module 40, the power supply and storage status can be determined in real time, and the photovoltaic power generation device can store the electrical energy converted from light energy in the battery module 20, and then discharge the load device and / or the power grid according to the power information of the battery module 20, thereby reducing the mismatch between power supply and demand caused by direct connection of photovoltaic energy to the load device and / or the power grid, and balancing the power supply and demand relationship.

[0040] Among them, the BMS module 30 is mainly used to intelligently manage and maintain the battery module 20, prevent the battery from being overcharged and over-discharged, extend the battery life, and monitor the battery status. For example, the energy storage control module is electrically connected to the BMS module 30 through a wiring harness, and the BMS module 30 is electrically connected to the battery module 20 through a wiring harness. In this way, communication between the energy storage control module and the battery module 20 is established through the BMS module 30.

[0041] Optionally, the energy storage control module is also electrically connected to the power grid via a wiring harness;

[0042] When the power information indicates that the power of the battery module 20 is less than or equal to the first power threshold, and the generated power is less than or equal to the first power threshold, the energy storage control module controls the power grid to charge the battery module 20;

[0043] When the power information indicates that the power of the battery module is greater than the first power threshold, the energy storage control module controls the battery module 20 to discharge the power grid.

[0044] In this embodiment, if the BMS module 30 monitors that the power of the battery module 20 is less than or equal to the first power threshold, it can indicate that the battery module 20 is in a state of insufficient power and needs to be charged. At this time, the MPPT module 40 can monitor the power generation of the photovoltaic power generation device. When the power generation is less than or equal to the first power threshold, it can indicate that the photovoltaic power generation device has a low photoelectric conversion efficiency. If the photovoltaic power generation device is controlled by the energy storage control module to charge the battery module 20, it is easy to have a power shortage. At this time, the energy storage control module can be used to control the power grid to charge the battery module 20 to reduce the power supply fluctuation caused by insufficient power generation of the photovoltaic power generation device. If the BMS module 30 monitors that the power of the battery module 20 is greater than the first power threshold, it can indicate that the battery module 20 is in a state of sufficient power. At this time, the energy storage control module can be used to control the battery module 20 to discharge the load device and / or the power grid. In this way, through the monitoring function of the BMS module 30 and the MPPT module 40, the power supply and storage status can be determined in real time, and when the photoelectric conversion efficiency of the photovoltaic power generation device is low, the electric energy of the power grid can be stored in the battery module 20, and then the load equipment and / or the power grid can be discharged according to the power information and power demand of the battery module 20, thereby reducing the mismatch between power supply and demand caused by direct connection of photovoltaic energy to the load equipment and / or the power grid, and balancing the power supply and demand relationship.

[0045] Among them, the MPPT module 40 monitors the power generation of the photovoltaic power generation device by detecting the power generation voltage of the photovoltaic power generation device in real time and tracking the current value corresponding to the highest power generation voltage to determine the maximum power of the photovoltaic power generation device, and monitor its fluctuation within a preset time, and determine the average power within the preset time as the power generation power.

[0046] The photovoltaic power generation device may include a solar panel, which can convert solar energy into electrical energy and store it in the battery module 20 .

[0047] Optionally, the energy storage control module includes a power conversion system (PCS) module 501, a DC circuit breaker 502 and an AC circuit breaker 503, the BMS module 30 and the MPPT module 40 are electrically connected to the PCS module 501 through wiring harnesses, respectively, the battery module 20 is electrically connected to the photovoltaic power generation device through the DC circuit breaker 502, and the battery module 20 is electrically connected to the power grid through the AC circuit breaker 503.

[0048] In this embodiment, by setting up the PCS module 501, AC / DC conversion can be performed during the charging and discharging process of the battery module 20, and power can be supplied to the AC load. The PCS module 501 can communicate with the BMS module 30 through a serial communication protocol (Controller Area Network, CAN) interface, dry contact transmission, etc., to obtain the power information of the battery module 20, and can realize protective charging and discharging of the battery to ensure the safe operation of the battery.

[0049] In order to protect the battery module 20 from being damaged by the direct current of the photovoltaic power generation device, and to disconnect the photovoltaic power generation device from the battery module 20 for safe maintenance, a DC circuit breaker 502 can be provided between the battery module 20 and the photovoltaic power generation device. When the external direct current is over-voltage, the DC circuit breaker 502 will be disconnected immediately to ensure the safe use of the battery module 20. At the same time, for safety during maintenance, the DC circuit breaker 502 can also be disconnected when necessary to ensure safe maintenance.

[0050] In addition, in order to protect the battery module 20 from the damage of the grid voltage and to safely perform maintenance, an AC circuit breaker 503 can also be set between the battery module 20 and the grid. When the external grid voltage is too high, the AC circuit breaker 503 will be disconnected immediately to ensure the safe use of the battery module 20. At the same time, for the safety of maintenance, the AC circuit breaker 503 can also be disconnected when necessary to perform maintenance safely.

[0051] Among them, the energy storage control module also includes a bidirectional converter, which can be arranged between the battery module 20 and the photovoltaic power generation device, and between the battery module 20 and the power grid, so as to realize the conversion between AC and DC as needed.

[0052] Optionally, it further includes an input / output terminal 60 , which is disposed between the battery module 20 and the photovoltaic power generation device, and between the battery module 20 and the power grid.

[0053] For example, take the case where the power grid charges the battery module 20: if the BMS module 30 detects that the power of the battery module 20 is less than or equal to the first power threshold, it can indicate that the battery module 20 is in a state of insufficient power and needs to be charged. The BMS module 30 immediately notifies the PCS module 501, and controls the AC circuit breaker 503 to open through the PCS module 501 to connect to the power grid; the power grid enters the PCS module 501 through the input terminal and the AC circuit breaker 503 in the input and output terminal 60, and the PCS module 501 converts the AC power into DC power to charge the battery. At the same time, the BMS module 30 monitors the power of the battery module 20 detected by the BMS module 30 at all times. When the battery power reaches the specified value, the circuit breaker is disconnected to cut off the power grid.

[0054] Among them, the input and output terminals 60 can adopt a waterproof design. For example, the input and output terminals 60 can be embedded in the bottom of the shell 10, and a waterproof plug is set at the assembly position of the input and output terminals 60 and the shell 10 to reduce the assembly gap between the input and output terminals 60 and the shell 10, thereby reducing rainwater entering the shell 10 from the port position and improving the service life of the photovoltaic energy storage device.

[0055] It should be understood that the photovoltaic power generation device can also charge the battery module 20 and discharge the battery module 20 through the input and output terminals 60, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0056] Optionally, an aerogel thermal insulation coating is applied on the shell 10 .

[0057] In this embodiment, the housing 10 can be in a rectangular structure, which is convenient for use in mobile environments such as ships, and reduces the possibility of the photovoltaic energy storage device tipping over. At the same time, an aerogel heat-insulating coating is applied on the housing 10, so that the temperature rise inside the housing can be reduced under sunlight, thereby reducing safety accidents caused by excessive battery temperature.

[0058] Optionally, the battery module 20 includes a plurality of battery modules arranged in an array, and the plurality of battery modules are arranged at intervals.

[0059] In this embodiment, the battery module 20 may include 12 battery modules, which can provide 60kWh of electricity. When the total electricity provided is the same, the battery module 20 is arranged into multiple arrays of battery modules, and the battery modules can be flexibly adjusted and replaced according to demand without replacing the entire battery pack; if one of the multiple battery modules fails, it will not affect the operation of the entire system, thereby improving the reliability of the overall system. In addition, the intervals between the battery modules improve the heat dissipation efficiency, making it easier to achieve effective thermal management and reduce the occurrence of battery overheating problems.

[0060] Each battery module can use lithium iron phosphate, which has the advantages of long life, high safety, large capacity, and environmental friendliness. With the cooperation of PCS module 501, battery module 20 can convert the electrical energy in the photovoltaic power generation device or the power grid during the low power consumption period into chemical energy and store it in the battery, and convert the chemical energy into electrical energy during the peak power consumption period of the power grid to alleviate the power shortage. The battery module 20 in the photovoltaic energy storage device can effectively solve the living and industrial electricity consumption in remote areas and tourist areas that are difficult to cover by conventional power grids, and produce less environmental pollution.

[0061] Optionally, a first ventilation and heat dissipation module 101 and a second ventilation and heat dissipation module 102 are further provided on the shell 10. The first ventilation and heat dissipation module 101 is located in an area corresponding to the first accommodating cavity, and the second ventilation and heat dissipation module 102 is located in an area corresponding to the second accommodating cavity.

[0062] In this embodiment, the first ventilation and heat dissipation module 101 and the second ventilation and heat dissipation module 102 can both be high-speed, high-flow axial flow fans. The first ventilation and heat dissipation module 101 is used to dissipate heat for the battery module 20 disposed in the first accommodation cavity; the second ventilation and heat dissipation module 102 is used to dissipate heat for the components disposed in the second accommodation cavity, so that the operating temperature of each component is maintained within a normal temperature range, reducing the situation where the temperature is too high and causes damage.

[0063] Optionally, the first ventilation and heat dissipation module 101 is electrically connected to the BMS module 30 via a wiring harness, and the output power of the first ventilation and heat dissipation module 101 is proportional to the charging power or discharging power of the battery module 20 .

[0064] In this way, the output power of the first ventilation and heat dissipation module 101 is controlled according to the collected charging power or discharging power of the battery module 20, thereby reducing the situation where the output power of the first ventilation and heat dissipation module 101 is large when the temperature of the battery module 20 is low, resulting in energy waste, and reducing the situation where the output power of the first ventilation and heat dissipation module 101 is small when the temperature of the battery module 20 is high, resulting in poor heat dissipation effect. The output power of the first ventilation and heat dissipation module 101 is controlled to respond to the changes in the charging power or discharging power of the battery module 20 in real time, and the heat dissipation strategy is automatically adjusted to ensure that the battery pack operates within the optimal temperature range.

[0065] Optionally, a first handle 103 and a second handle 104 are further provided on the housing 10. The first handle 103 and the second handle 104 are arranged opposite to each other, and the first handle 103 is located in a region corresponding to the first accommodating cavity, and the second handle 104 is located in a region corresponding to the second accommodating cavity.

[0066] The first handle 103 can be used to open or close the inlet and outlet passage of the first accommodating chamber, and the second handle 104 can be used to open or close the inlet and outlet passage of the second accommodating chamber. In this way, the first accommodating chamber and the second accommodating chamber are independently partitioned to facilitate subsequent maintenance work.

[0067] The utility model provides a photovoltaic energy storage device in the embodiment, which can store energy by using the low electricity price in the valley section of the power grid through peak shaving and valley filling, and / or converting sunlight into electrical energy and storing it; then discharging it for use during peak hours, thereby reducing the mismatch between power supply and demand caused by direct access of photovoltaic energy to load equipment and / or the power grid, and balancing the power supply and demand relationship. It can alleviate the tension of the power grid, ensure the smooth operation of the power grid, reduce carbon emissions, and promote the realization of the dual-carbon strategy.

[0068] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A photovoltaic energy storage device, characterized in that: include: A housing, the housing comprising a first accommodating chamber and a second accommodating chamber, wherein the accommodating space of the first accommodating chamber is larger than the accommodating space of the second accommodating chamber; A battery module, the battery module is used to store electric energy, and the battery module is arranged in the first accommodating cavity; A battery management system BMS module is disposed in the second accommodating cavity, and the BMS module is electrically connected to the battery module through a wiring harness to collect power information of the battery module; A maximum power point tracking (MPPT) module is disposed in the second accommodating cavity, and the MPPT module is electrically connected to the photovoltaic power generation device through a wiring harness to monitor the power generation of the photovoltaic power generation device; An energy storage control module is arranged in the second accommodating cavity, the energy storage control module is electrically connected to the BMS module through a wiring harness to obtain the power information, and the energy storage control module is also electrically connected to the MPPT module through a wiring harness to obtain the generated power; When the power information indicates that the power of the battery module is less than or equal to the first power threshold, and the generated power is greater than the first power threshold, the energy storage control module controls the photovoltaic power generation device to charge the battery module.

2. The photovoltaic energy storage device according to claim 1, characterized in that: The energy storage control module is also electrically connected to the power grid via a wiring harness; When the power information indicates that the power of the battery module is less than or equal to the first power threshold, and the generated power is less than or equal to the first power threshold, the energy storage control module controls the power grid to charge the battery module; When the power information indicates that the power of the battery module is greater than the first power threshold, the energy storage control module controls the battery module to discharge to the power grid.

3. The photovoltaic energy storage device according to claim 2, characterized in that: The energy storage control module includes an energy storage inverter PCS module, a DC circuit breaker and an AC circuit breaker. The BMS module and the MPPT module are electrically connected to the PCS module through wiring harnesses, respectively. The battery module is electrically connected to the photovoltaic power generation device through the DC circuit breaker, and the battery module is electrically connected to the power grid through the AC circuit breaker.

4. The photovoltaic energy storage device according to claim 3, characterized in that: The energy storage control module also includes a bidirectional converter, which is arranged between the battery module and the photovoltaic power generation device, and between the battery module and the power grid.

5. The photovoltaic energy storage device according to claim 2, characterized in that: It also includes input and output terminals, which are arranged between the battery module and the photovoltaic power generation device, and between the battery module and the power grid.

6. The photovoltaic energy storage device according to any one of claims 1 to 5, characterized in that: An aerogel heat-insulating coating is applied on the shell.

7. The photovoltaic energy storage device according to any one of claims 1 to 5, characterized in that: The battery module includes a plurality of battery modules arranged in an array, and the plurality of battery modules are arranged at intervals.

8. The photovoltaic energy storage device according to any one of claims 1 to 5, characterized in that: The shell is also provided with a first ventilation and heat dissipation module and a second ventilation and heat dissipation module. The first ventilation and heat dissipation module is located in a region corresponding to the first accommodating cavity, and the second ventilation and heat dissipation module is located in a region corresponding to the second accommodating cavity.

9. The photovoltaic energy storage device according to claim 8, characterized in that: The first ventilation and heat dissipation module is electrically connected to the BMS module through a wiring harness, and the output power of the first ventilation and heat dissipation module is proportional to the charging power or discharging power of the battery module.

10. The photovoltaic energy storage device according to any one of claims 1 to 5, characterized in that: The shell is further provided with a first handle and a second handle, wherein the first handle is arranged opposite to the second handle, and the first handle is located in an area corresponding to the first accommodating cavity, and the second handle is located in an area corresponding to the second accommodating cavity.

Images