Electrical energy storage device

Abstract

The invention discloses electric energy storage equipment, and belongs to the technical field of energy storage. The electric energy storage equipment comprises a compartment body of a container, an equipment room, an air conditioner room and a battery bin are arranged in the compartment body, a plurality of electric power storage modules, an air conditioner air outlet system, an air supply system and an air exhaust system are arranged in the battery bin, each electric power storage module comprises a battery rack, the air supply system supplies air from one side of the battery rack, and the air exhaust system supplies air from the other side of the battery rack. The exhaust system exhausts air from the other side and the rear side of the battery rack; according to the invention, by arranging the air supply system, cold air can be supplied from one side of the battery rack, and then the air exhaust system exhausts air from the other side and the rear side of the battery rack, so that air flow is accelerated, heat generated by the battery pack can be taken away quickly, and the temperature in the battery compartment is easier to control; therefore, the problem that battery energy storage equipment in the prior art only depends on an air conditioner to control the temperature but cannot quickly eliminate the generated heat is solved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to electric energy storage equipment. Background Art

[0002] Power storage technology is a technology for storing electric energy. In the power system, the production and use of electric energy are carried out simultaneously and are balanced in quantity. However, the power consumption is always fluctuating, and the possibility of power generation equipment failure must also be considered. Therefore, the capacity of the power generation equipment put into operation in the system is often higher than the power consumption, so that the excess electric energy can be stored and adjusted for use when the reserve power increases. Energy storage methods include pumped storage, battery storage, superconductor storage, mechanical flywheel storage, compressed air storage, etc.

[0003] As for battery energy storage, it is highly flexible and can be installed in different locations to adapt to various application scenarios. At the same time, it has a fast response speed and can quickly respond to changes in electricity demand and achieve rapid charging and discharging.

[0004] Specific application scenarios: Renewable energy integration: Help balance the intermittent power generation of renewable energy such as solar and wind power.

[0005] Power peak shaving: charging during low-power consumption periods and discharging during peak periods to relieve pressure on the power grid.

[0006] Microgrids: Provide reliable power storage for independent microgrids.

[0007] However, since battery energy storage mainly relies on batteries to store and release energy, and temperature has an important impact on battery performance and life, it is very important to cool the equipment in battery energy storage equipment. However, in the prior art, temperature control is only carried out by air conditioning. Although air conditioning can play a cooling role, the heat generated by all battery packs is not easy to dissipate quickly, and the heat between each battery pack will also affect each other. In view of this problem, the present invention makes improvements. Summary of the invention

[0008] The purpose of the present invention is to solve the problem in the prior art that the battery energy storage device only relies on air conditioning to control the temperature but cannot quickly eliminate the generated heat, and to propose an electric energy storage device.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions: The electric energy storage device includes a container body, wherein the body is provided with an equipment room, an air-conditioning room and a battery compartment, wherein the battery compartment is provided with a plurality of power storage modules, an air-conditioning outlet system, an air supply system and an exhaust system, wherein the power storage module includes a battery rack, wherein the air supply system supplies air from one side of the battery rack, and wherein the exhaust system exhausts air from the other side and the rear side of the battery rack, and wherein the air-conditioning outlet system is respectively arranged at the top of the battery compartment and below the battery rack.

[0010] Preferably, the battery rack is divided into several layers by several partitions, each layer is provided with a battery pack, and the battery pack is fixedly arranged on the corresponding partition.

[0011] Preferably, the air supply system includes a right baffle, and the exhaust system includes a left baffle, and the left baffle and the right baffle are respectively fixedly arranged on the left and right sides of the battery rack, and the left baffle and the right baffle are both hollow inside, and both have ventilation holes on the inside of them, the same number as the battery packs.

[0012] Preferably, a left connecting pipe is fixedly provided on the top of the left baffle, and a right connecting pipe is fixedly provided on the top of the right baffle.

[0013] Preferably, the air supply system includes an air supply pipe, and the right connecting pipe is connected to the air supply pipe through a first connecting pipe.

[0014] Preferably, the exhaust system also includes a rear baffle and an exhaust duct, the rear baffle is hollow inside, a rear connecting pipe is fixedly arranged on the top, the rear baffle is fixedly arranged at the rear end of the battery rack, the rear connecting pipe and the exhaust duct are connected through a second connecting pipe, the left connecting pipe and the exhaust duct are connected through a third connecting pipe, and an exhaust port is opened at the bottom of the inner side of the rear baffle.

[0015] Preferably, the partition is double-layered and hollow, and the middle part is connected front to back, and the rear end of the partition is connected to the rear baffle.

[0016] Preferably, the air-conditioning air supply system includes an air-conditioning duct, which is provided with a plurality of air outlets. The air-conditioning air supply system is divided into an upper and lower part. The air-conditioning duct of the upper air-conditioning air supply system is fixedly arranged at the top of the battery compartment, and its air outlet faces downward, and the air-conditioning duct of the lower air-conditioning air supply system is fixedly arranged at the bottom of the battery compartment, and its air outlet faces upward.

[0017] Preferably, the air outlet of the lower air conditioning and air supply system is located below the bottom of the battery rack, and one air outlet corresponds to one battery rack, and a ventilation grille is provided at the bottom of the battery rack.

[0018] Preferably, a cooling fan is provided at the rear end of the battery pack, a square hole is provided on the inner side of the rear baffle, and the cooling fan is located inside the rear baffle after passing through the square hole.

[0019] Compared with the prior art, the present invention provides an electric energy storage device having the following beneficial effects.

[0020] 1. The present invention can supply cold air from one side of the battery rack through the air supply system, and then the exhaust system exhausts air from the other side and the rear side of the battery rack, thereby accelerating the air flow, so that the heat generated by the battery pack can be quickly taken away, thereby making it easier to control the temperature in the battery compartment, thereby solving the problem in the prior art that the battery energy storage equipment only relies on air conditioning to control the temperature but cannot quickly eliminate the generated heat.

[0021] Other advantages, objectives and features of the present invention will be described in part in the following description; and in part, will be apparent to those skilled in the art based on an examination of the following; or, may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0024] Figure 3 It is a schematic diagram of the local structure of the present invention.

[0025] Figure 4 It is a schematic diagram of the local structure of the present invention.

[0026] Figure 5 It is a structural schematic diagram of the power storage module in the present invention.

[0027] Figure 6 It is a schematic structural diagram of the cross section of the power storage module and the rear baffle in the present invention.

[0028] Figure 7 It is a schematic diagram of the partial structure of the power storage module in the present invention.

[0029] Figure 8 It is a schematic diagram of the cross-sectional structure of the power storage module in the present invention.

[0030] Fig. 9 It is a schematic diagram of the cross-sectional structure of the right baffle in the present invention.

[0031] Fig.10 It is a schematic structural diagram of the rear baffle in the present invention.

[0032] Fig.11 It is a structural schematic diagram of the battery rack in the present invention.

[0033] Fig.12 It is a schematic structural diagram of the partition in the present invention.

[0034] Fig.13 It is a schematic diagram of the overall structure of the present invention.

[0035] In the figure: 1. Box body; 2. Air conditioning room; 3. Equipment room; 4. Left baffle; 5. Battery pack; 6. Partition; 7. Base; 8. Air outlet; 9. Air conditioning duct; 10. Battery compartment; 11. First connecting pipe; 12. Second connecting pipe; 13. Third connecting pipe; 14. Air supply pipe; 15. Exhaust pipe; 16. Rear baffle; 17. Battery rack; 18. Left connecting pipe; 19. Rear connecting pipe; 20. Right connecting pipe; 21. Ventilation port; 22. Ventilation grille; 23. Exhaust port; 24. Cooling fan; 25. Right baffle. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Reference Figure 1-13 The electric energy storage device includes a container body 1, in which an equipment room 3, an air-conditioning room 2 and a battery compartment 10 are arranged. The battery compartment 10 is provided with a plurality of power storage modules, an air-conditioning outlet system, an air supply system and an exhaust system. The power storage module includes a battery rack 17. The air supply system supplies air from one side of the battery rack 17, and the exhaust system exhausts air from the other side and the rear side of the battery rack 17. The air-conditioning outlet system is respectively arranged at the top of the battery compartment 10 and below the battery rack 17.

[0038] In a specific embodiment of the present invention, the battery module is mainly used for battery storage and discharge, and its specific number is set according to actual needs. Five groups of battery modules are shown in this application; the air supply system and the exhaust system jointly accelerate the air circulation to better dissipate the heat of the battery module, and the air-conditioning outlet system transports cold air into the battery compartment 10 to cool the interior of the battery compartment 10 as a whole, and the air-conditioning outlet system located at the top of the battery compartment 10 is for cooling the interior of the battery compartment 10 as a whole, and the air-conditioning outlet system located below the battery rack 17 is for cooling the bottom of the battery rack 17. At the same time, in the exhaust system, when exhausting the rear side of the battery rack 17, cold air can be drawn from the air-conditioning outlet system, so that cold air can be transported while exhausting, so that the rear side of the battery rack 17 can also quickly dissipate heat and cool down; and through this setting, each battery storage module can have separate air circulation, so as to achieve the effect of non-interference in the temperatures of each battery storage module.

[0039] In equipment room 3, the following can be set up: Battery Management System (BMS), as follows: Various sensors, including: Voltage sensor: monitors the voltage of battery cells and battery pack 5.

[0040] Current sensor: measures the charge and discharge current.

[0041] Temperature sensor: detects battery temperature.

[0042] Main control unit, including: Receive sensor data for analysis and processing.

[0043] Communicates battery status information with external systems.

[0044] Responsible for the balanced management of the battery pack 5, etc., to ensure that the battery is not overcharged or over-discharged, and the temperature is kept within a reasonable range, etc.

[0045] Power conversion system (PCS, energy storage converter), as follows: Power semiconductor devices (such as IGBT, etc.): realize AC-DC conversion.

[0046] Control circuit: Controls bidirectional energy conversion (converts grid AC power into DC power for the battery during charging, and converts battery DC power into AC power for the load or grid during discharging).

[0047] Control and adjust power quality, etc.

[0048] Electrical system, as follows: High-voltage distribution cabinet (if there is high voltage): contains busbars, circuit breakers, etc., for high-voltage side power distribution and control.

[0049] Low-voltage distribution cabinet: responsible for the power supply distribution of internal low-voltage equipment such as lighting, control systems, etc.

[0050] Connecting cables and busbars: used for connection between battery pack 5, PCS, distribution cabinets and other equipment.

[0051] Monitoring and communication systems, as follows: Local monitoring terminal: monitoring equipment that can be viewed and operated on-site in the container.

[0052] Remote communication module: such as 4G / 5G wireless communication module or Ethernet communication module, to realize remote monitoring, data transmission, remote control command reception, etc.

[0053] Data acquisition unit: collects operating data of batteries, PCS and other equipment.

[0054] The battery rack 17 is divided into several layers by several partitions 6, each layer is provided with a battery pack 5, and the battery pack 5 is fixedly arranged on the corresponding partition 6; The battery rack 17 can be layered by the partition 6, so that the heat between the upper and lower battery packs 5 is not easy to flow directly up and down, and the temperature between the two adjacent battery packs 5 is prevented from affecting each other; In this solution, the partition 6 is fixed on the battery rack 17. Six partitions 6 are arranged on one battery rack 17 and are evenly distributed on the battery rack 17 from top to bottom. Correspondingly, six battery packs 5 are arranged on one battery rack 17. Each battery pack 5 corresponds to a partition 6. The battery packs 5 and the partitions 6 can be connected by screws.

[0055] The air supply system includes a right baffle 25, and the exhaust system includes a left baffle 4. The left baffle 4 and the right baffle 25 are fixedly arranged on the left and right sides of the battery rack 17, respectively. The left baffle 4 and the right baffle 25 are both hollow inside, and both have the same number of vents 21 as the battery pack 5. The left baffle 4 and the right baffle 25 have the same structure and size, and are symmetrically arranged. In this solution, the left baffle 4 and the right baffle 25 are used to block the left and right sides of the battery rack 17, so as to close the two sides of the battery rack 17 to avoid the influence between the adjacent battery racks 17, and secondly, they are used as air ducts, and the gas can flow inside the left baffle 4 and the right baffle 25 for exhaust or air supply. When used for exhaust, the vent 21 is the air inlet, and when used for air supply, the vent 21 is the air outlet; The number of vents 21 on the left baffle 4 or the right baffle 25 is the same as the number of battery packs 5 on the same battery rack 17, and each vent 21 corresponds to a battery pack 5, and the corresponding vents 21 and battery packs 5 have the same height, that is, a vent 21 on the left baffle 4 corresponds to the side of the corresponding battery pack 5, and correspondingly, the vent 21 on the right baffle 25 corresponds to the other side of the battery pack 5.

[0056] A left connecting pipe 18 is fixedly provided on the top of the left baffle 4 , and a right connecting pipe 20 is fixedly provided on the top of the right baffle 25 ; the left connecting pipe 18 is communicated with the interior of the left baffle 4 , and the right connecting pipe 20 is communicated with the interior of the right baffle 25 .

[0057] The air supply system includes an air supply duct 14, and the right connecting pipe 20 is connected to the air supply duct 14 through the first connecting pipe 11; the air supply duct 14 is used to supply air, and the supplied air passes through the first connecting pipe 11 into the right connecting pipe 20, and then enters the right baffle 25, and then the right baffle 25 transports the air to the positions of the battery packs 5 on each layer; the air supply duct 14 can be connected to the air conditioning air supply system to transport cold air to the battery pack 5.

[0058] The exhaust system also includes a rear baffle 16 and an exhaust pipe 15. The rear baffle 16 is hollow inside, and a rear connecting pipe 19 is fixedly arranged on the top thereof. The rear baffle 16 is fixedly arranged at the rear end of the battery rack 17. The rear connecting pipe 19 is connected to the exhaust pipe 15 through the second connecting pipe 12, and the left connecting pipe 18 is connected to the exhaust pipe 15 through the third connecting pipe 13. An air vent 23 is provided at the bottom of the inner side of the rear baffle 16. In this solution, the rear baffle 16 is used to block the rear side of the battery rack 17 and to exhaust the air duct. The exhaust system also includes a fan for exhausting air, which is used to draw air outwards; when in use, the fan draws air from the exhaust pipe 15, and then the left baffle 4 can draw air from the left side of the battery pack 5, so as to timely remove the heat generated by the battery pack 5. At the same time, since the right baffle 25 on the right side transmits cold air to the battery pack 5, the left baffle 4 can absorb a part of the cold air while removing the heat, so that the cold air can fully cover the battery pack 5, so as to accelerate the gas flow rate and take away the generated heat, so that the temperature control of the battery pack 5 is more stable, and the generated heat will not be unable to be discharged in time, resulting in the air conditioner requiring a stronger power to reduce the temperature; In addition, during exhaust, the rear baffle 16 can exhaust the heat behind the battery pack 5 , and the principle is the same as that of the left baffle 4 .

[0059] The partition 6 is double-layered and hollow, and the middle part is connected front to back, and the rear end of the partition 6 is connected to the rear baffle 16; through this arrangement, it is not easy to produce temperature influence between the upper and lower adjacent battery groups 5. At the same time, when the exhaust system is working, the fan draws air from the exhaust pipe 15, and the rear baffle 16 is connected to the middle part of the partition 6, so that the gas in the hollow position of the partition 6 can be discharged, avoiding the retention of slightly higher temperature gas here.

[0060] The air conditioning and air supply system includes an air conditioning duct 9, on which a plurality of air outlets 8 are arranged. The air conditioning and air supply system is divided into an upper and lower part. The air conditioning duct 9 of the upper air conditioning and air supply system is fixedly arranged at the top of the battery compartment 10, and its air outlet 8 faces downward, and the air conditioning duct 9 of the lower air conditioning and air supply system is fixedly arranged at the bottom of the battery compartment 10, and its air outlet 8 faces upward; The air conditioning duct 9 is connected to the air conditioning host, which is arranged in the air conditioning room 2. The air conditioning host is used for cooling, and the air is transported to the battery compartment 10 through the air conditioning duct 9. The upper air conditioning air supply system cools the entire battery compartment 10, while the lower air conditioning air supply system is used in conjunction with the exhaust system. The air supply pipe 14 in this solution can be connected to the air conditioning duct 9, so that the air sent to the battery pack 5 is cold air, which is convenient for cooling the battery pack 5.

[0061] The air outlet 8 of the lower air conditioning and air supply system is located below the bottom of the battery rack 17, and one air outlet 8 corresponds to one battery rack 17, and a ventilation grille 22 is provided at the bottom of the battery rack 17; a base 7 is fixedly provided in the battery compartment 10 on the bottom surface of the compartment 1, and the battery rack 17 is fixedly provided on the base 7, and the height of the base 7 is greater than the height of the air conditioning duct 9 of the lower air conditioning and air supply system; A cooling fan 24 is provided at the rear end of the battery pack 5, and a square hole is provided on the inner side of the rear baffle 16. The cooling fan 24 passes through the square hole and is located inside the rear baffle 16; The heat dissipation fan 24 is a built-in heat dissipation fan 24 on the battery pack 5, which dissipates the heat generated inside the battery pack 5. The heat dissipation fan 24 is used to discharge the heat into the rear baffle 16, and then is drawn away by the fan. At the same time, when the exhaust system is working, the rear baffle 16 can absorb the cold air from the corresponding air outlet 8 from the air outlet 23 to reduce the temperature inside the rear baffle 16, thereby reducing the temperature at the rear end of the battery pack 5.

[0062] Working process: Under normal circumstances, the air conditioner is always used to cool down the temperature in the battery compartment 10, and then the temperature sensor is used to monitor the temperature of the battery module and the battery compartment 10. If more heat is generated when the battery module is charged and discharged, the air supply system and the exhaust system are started. When the air supply system is in use, cold air is extracted from the air conditioning duct 9 and sent to the right baffle 25 (a fan can be set on the air supply duct 14 to extract cold air and send it to the right baffle 25), and then the cold air flows from the right baffle 25 to the positions of each battery pack 5. At this time, the fan of the exhaust system extracts air, and absorbs the heat at the position of the battery pack 5 at the vent 21 of the left baffle 4, and forms air supply and exhaust in combination with the right baffle 25, so that the air circulation at the battery pack 5 is accelerated, and while the heat is extracted, the cold air is more comprehensively covered on the battery pack 5, so as to achieve the effect of rapid heat removal and cooling at the same time, and can also achieve the effect of rapid cooling without changing the air conditioner temperature; When exhausting air, the rear baffle 16 can also draw away the gas in the hollow position of the partition 6, and promptly discharge the heat discharged by the cooling fan 24 at the rear end of the battery pack 5, and absorb the cold air from the bottom air outlet 8 to ensure that the temperature inside the rear baffle 16 does not rise, thereby achieving rapid heat exhaust and enhancing the circulation of cold air, making temperature control faster and more efficient.

[0063] In this solution, the left baffle 4, the right baffle 25 and the rear baffle 16 are provided to block the left and right sides and the rear side of the battery rack 17, so as to achieve the effect of isolating adjacent battery racks 17, so that the temperatures of adjacent storage modules will not affect each other; at the same time, the partition 6 can separate the adjacent battery groups 5 on the same battery rack 17 to avoid temperature influence between adjacent battery groups 5; so that each battery group 5 is in a relatively independent space, and then the corresponding vents 21 on the left baffle 4 and the corresponding vents 21 on the right baffle 25, together with the space where the battery group 5 is located, form a gas flow path equivalent to a one-way flow path, so that the heat generated by the battery group 5 can be sent away in time, and cold air is sent in to accelerate the cooling of the battery group 5; at the same time, the rear baffle 16 also takes away the heat emitted by the cooling fan 24 of the battery group 5 in time, so as to avoid the heat from diffusing into the battery compartment 10 and affecting the overall temperature; In addition, in the present solution, when the temperature does not rise much, only the exhaust system can be started to dissipate heat. When dissipating heat in this state, the right baffle 25 does not supply air to the position of the battery pack 5, but directly extracts heat from the left baffle 4. During the extraction process, the air with a relatively low temperature outside the battery rack 17 can also be sucked in, so that the heat is taken away while the relatively low temperature gas flows to the position of the battery pack 5, achieving a cooling effect.

[0064] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An electric energy storage device, comprising a container body (1), It is characterized in that The compartment (1) is provided with an equipment room (3), an air conditioning room (2) and a battery compartment (10); the battery compartment (10) is provided with a plurality of power storage modules, an air conditioning outlet system, an air supply system and an exhaust system; the power storage module comprises a battery rack (17); the air supply system supplies air from one side of the battery rack (17); the exhaust system exhausts air from the other side and the rear side of the battery rack (17); the air conditioning outlet system is respectively arranged at the top of the battery compartment (10) and below the battery rack (17).

2. The power storage device according to claim 1, It is characterized in that The battery rack (17) is divided into a plurality of layers by a plurality of partitions (6), each layer being provided with a battery pack (5), and the battery pack (5) being fixedly arranged on a corresponding partition (6).

3. The power storage device according to claim 2, It is characterized in that The air supply system comprises a right baffle (25), and the air exhaust system comprises a left baffle (4). The left baffle (4) and the right baffle (25) are respectively fixedly arranged on the left and right sides of the battery rack (17). The left baffle (4) and the right baffle (25) are both hollow inside, and both are provided with ventilation holes (21) on the inside of the same number as the battery pack (5).

4. The power storage device according to claim 3, It is characterized in that A left connecting pipe (18) is fixedly provided on the top of the left baffle (4), and a right connecting pipe (20) is fixedly provided on the top of the right baffle (25).

5. The power storage device according to claim 4, It is characterized in that The air supply system comprises an air supply pipe (14), and the right connecting pipe (20) is connected to the air supply pipe (14) via the first connecting pipe (11).

6. The power storage device according to claim 4, It is characterized in that The exhaust system further comprises a rear baffle (16) and an exhaust pipe (15); the rear baffle (16) is hollow inside and has a rear connecting pipe (19) fixedly arranged on its top; the rear baffle (16) is fixedly arranged at the rear end of the battery rack (17); the rear connecting pipe (19) is connected to the exhaust pipe (15) via a second connecting pipe (12); the left connecting pipe (18) is connected to the exhaust pipe (15) via a third connecting pipe (13); and an exhaust port (23) is provided at the bottom of the inner side of the rear baffle (16).

7. The power storage device according to claim 6, It is characterized in that The partition (6) is double-layered and hollow, and the middle portion is connected front to back, and the rear end of the partition (6) is connected to the rear baffle (16).

8. The power storage device according to claim 1, It is characterized in that The air conditioning and air supply system comprises an air conditioning duct (9), and a plurality of air outlets (8) are arranged on the air conditioning duct (9). The air conditioning and air supply system is divided into an upper and lower part. The air conditioning duct (9) of the upper air conditioning and air supply system is fixedly arranged at the top of the battery compartment (10), and its air outlet (8) faces downward, and the air conditioning duct (9) of the lower air conditioning and air supply system is fixedly arranged at the bottom of the battery compartment (10), and its air outlet (8) faces upward.

9. The power storage device according to claim 8, It is characterized in that The air outlet (8) of the lower air conditioning air supply system is located below the bottom of the battery rack (17), and one air outlet (8) corresponds to one battery rack (17). A ventilation grille (22) is provided at the bottom of the battery rack (17).

10. The power storage device according to claim 6, It is characterized in that A cooling fan (24) is provided at the rear end of the battery pack (5), a square hole is provided on the inner side of the rear baffle (16), and the cooling fan (24) is located inside the rear baffle (16) after passing through the square hole.

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