Energy storage device and energy storage system

Abstract

The utility model provides an energy storage device and an energy storage system. The energy storage device comprises a plurality of battery modules; a first space in the cabinet body is suitable for accommodating at least two rows of battery modules, an inter-module air inlet is formed between every two adjacent battery modules in each row of battery modules, and a total air inlet is further formed in the bottom of the cabinet body; the cabinet door is provided with an air inlet structure, and the bottom of the air inlet structure corresponds to the main air inlet in the spatial position; the bottom of the air inlet structure is of a hollow structure, so that a flowing medium in the main air inlet enters the air inlet structure; a plurality of ventilation openings are formed in the sides, close to the battery modules, of the air inlet structures, the ventilation openings correspond to the inter-module air inlets in a one-to-one mode in the spatial position, and the ventilation openings are suitable for introducing a flowing medium in the main air inlet into the inter-module air inlets so that the flowing medium can flow in the two rows of battery modules. According to the energy storage device and the energy storage system provided by the invention, air-cooling heat dissipation can be performed on the battery cell, the power consumption of the whole machine is reduced, and the system efficiency is improved.

Description

Technical Field

[0001] The present application mainly relates to the field of electrochemical energy storage technology, and in particular to an energy storage device and an energy storage system. Background Art

[0002] As energy storage requirements for battery cells continue to rise, the use of high-temperature cells will become increasingly common. Existing commercial and industrial outdoor energy storage cabinets require air conditioners and liquid coolers to dissipate heat from the battery modules. These consume significant power, impacting system efficiency. Maintenance is inconvenient, resulting in high O&M costs and the high price of individual air-cooled air conditioners and liquid coolers. Furthermore, existing outdoor energy storage cabinets require external power converters, resulting in low system integration and complex structures. Utility Model Content

[0003] The technical problem to be solved by the present application is to provide an energy storage device and an energy storage system that can perform air cooling on battery cells, reduce the power consumption of the entire device, and improve system efficiency.

[0004] To solve the above technical problems, the present application provides an energy storage device, comprising: a plurality of battery modules; a cabinet, wherein the first space inside the cabinet is suitable for accommodating at least two columns of the battery modules, and an inter-module air inlet is formed between each adjacent two battery modules in each column of the battery modules, wherein a main air inlet is also provided at the bottom of the cabinet; and a cabinet door, wherein an air inlet structure is provided on the cabinet door, wherein the bottom of the air inlet structure corresponds to the main air inlet in terms of spatial position; the bottom of the air inlet structure is a hollow structure, so that the flowing medium in the main air inlet enters the air inlet structure; the air inlet structure has a plurality of ventilation openings on a side close to the battery modules, the ventilation openings correspond one-to-one to the inter-module air inlets in terms of spatial position, and the ventilation openings are suitable for passing the flowing medium in the main air inlet into the inter-module air inlet, so that the flowing medium flows in the two columns of battery modules.

[0005] Optionally, the energy storage device further includes a battery management system, a current conversion system and / or a power distribution system, and the second space of the cabinet is suitable for accommodating the battery management system, the current conversion system and / or the power distribution system.

[0006] Optionally, a length ratio of the first space to the second space in the vertical direction ranges from 3 to 4.

[0007] Optionally, the cabinet is further provided with filter cotton at the position of the main air inlet, and the filter cotton is used to filter the flow medium entering the cabinet from the main air inlet.

[0008] Optionally, one or more battery racks are provided inside the energy storage device, and the battery racks are suitable for carrying the battery modules. A partition plate is provided between each two adjacent columns of the battery modules, and the partition plate is suitable for isolating each two adjacent columns of the battery modules.

[0009] Optionally, a fan and an air outlet connected to the fan are further provided on the top of the cabinet, and the fan is suitable for discharging the flow medium after entering the cabinet from the main air inlet through the air outlet.

[0010] Optionally, a fire-fighting component is further provided on the top of the cabinet, and the fire-fighting component is suitable for extinguishing a fire in the energy storage device under preset circumstances.

[0011] Optionally, the air inlet structure is a rectangular parallelepiped structure, and the length of the air inlet structure ranges from 0.9m to 1.1m, the width ranges from 0.2m to 0.3m, and the height ranges from 1m to 1.2m.

[0012] Optionally, the vent is a rectangular structure, the length of the vent is less than or equal to the length of the air inlet structure, the length range of the vent is 0.8m to 1m, and the width range is 9cm to 10cm.

[0013] Optionally, the battery module includes: one or more battery cell groups, each of the battery cell groups including a plurality of battery cells cascaded along a first direction; a first end plate and a second end plate, located at the first end and the second end opposite to each other along the first direction of the battery module, the one or more battery cell groups are located between the first end plate and the second end plate, the first end plate and the second end plate both have an upper end surface of the end plate, the upper end surface of the end plate includes one or more end plate fixing parts; one or more fixing strips, located on the first side surface of the battery cell group, each of the fixing strips having an extension extending along the first direction and connecting parts located at both ends of the extension part, the connecting parts at both ends of each extension part are suitable for being fixedly connected to the end plate fixing parts on the upper end surface of the end plate of the first end plate and the second end plate, respectively; and one or more insulating sheets, the insulating sheet is located between the first side surface of the battery cell group and each of the fixing strips, the width of the insulating sheet along a second direction perpendicular to the first direction is greater than or equal to the width of the fixing strip along the second direction.

[0014] Optionally, the battery module further includes one or more steel strips, each of the steel strips surrounds the battery cell group, and the extension direction of the steel strips on the first side surface is parallel to the first direction when surrounding the battery cell group.

[0015] Optionally, the covering sheet is located on the first side surface of the battery cell group and covers at least an exposed area of ​​the first side surface.

[0016] Optionally, the cover sheet includes a polymer phase change material, and the polymer phase change material includes a solid-solid phase change material and / or a solid-liquid phase change material energy storage system, wherein the solid-solid phase change material includes an alkane material, an inorganic salt, a polyol material and / or a cross-linked high-density polyethylene material, and the solid-liquid phase change material includes sodium sulfate, sodium acetate, calcium chloride, disodium hydrogen phosphate, carbonate, nitrate, sodium chloride, lithium fluoride, paraffin and / or fatty acid material.

[0017] To solve the above technical problems, the present application provides an energy storage system, comprising one or more energy storage devices as described above.

[0018] Compared with the prior art, the present application dissipates heat from the battery cells through air cooling, which can dissipate heat from the battery cells through air cooling, reduce the power consumption of the entire machine, and improve the efficiency of the system. The present application can filter the heat dissipation gas entering the interior of the energy storage device by placing filter cotton on the air inlet, preventing dust and other interfering substances from entering the energy storage device and affecting the internal performance of the energy storage device. The present application further integrates the battery management system and the power distribution system into the energy storage device, and eliminates the upper cover structure of the battery module. The battery module is fixed with a fixing bar, which saves the internal space of the energy storage device and improves the integration of the energy storage device. The battery management system, current conversion system and power distribution system are integrated into the energy storage device so that the energy storage device does not need to be connected to other external equipment, and the structure is simpler and more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application. They are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present application and, together with this specification, serve to explain the principles of the present application. In the accompanying drawings:

[0020] Figure 1 This is a schematic structural diagram of an energy storage device in a working state according to an embodiment of the present application;

[0021] Figure 2 This is a schematic structural diagram of an energy storage device in a working state according to an embodiment of the present application;

[0022] Figure 3 is a cross-sectional view of an energy storage device in one embodiment of the present application;

[0023] Figure 4 It is a structural schematic diagram of a battery module in an energy storage device in one embodiment of the present application.

[0024] Reference numerals

[0025] Energy Storage System 100

[0026] Energy storage device 100

[0027] Battery module 14

[0028] Current conversion system 11

[0029] Power distribution system 12

[0030] Cabinet 101

[0031] First space S1

[0032] Second Space S2

[0033] Air inlet 103 between modules

[0034] Total air inlet 104

[0035] Cabinet door 105

[0036] Air intake structure 106

[0037] Ventilation 107

[0038] Filter cotton 108

[0039] Battery rack 109

[0040] Partition plate 110

[0041] Fan 111

[0042] Air outlet 112

[0043] Battery pack 201

[0044] First end plate 202

[0045] Second end plate 203

[0046] Fixing bar 204

[0047] Insulation sheet 205

[0048] First direction X

[0049] Second direction Y

[0050] End plate upper surface 206

[0051] End plate fixing portion 207

[0052] First side S3

[0053] Extension 2041

[0054] Connecting part 2042

[0055] Battery cell end plate 208

[0056] First cell end plate 2081

[0057] Second cell end plate 2082

[0058] Steel Strip 209

[0059] Cover sheet 113 DETAILED DESCRIPTION

[0060] To more clearly illustrate the technical solutions of the embodiments of this application, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0061] As used in this application and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0062] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0063] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0064] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0065] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is solely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. Furthermore, while the terms used in this application are selected from commonly known and commonly used terms, some terms mentioned in this specification may have been selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant sections of this description. Furthermore, this application should be understood not only by the actual terms used, but also by the meaning implied by each term.

[0066] This application refers to Figure 1 and Figure 2 An energy storage device 100 is proposed, comprising a plurality of battery modules 14, a current conversion system 11, and a power distribution system 12. The energy storage device 100 is preferably suitable for outdoor scenes, and the battery modules 14 are usually high-temperature cells. Figure 1 It shows a schematic structural diagram of the energy storage device 100 after assembling the battery module 14; Figure 2 The diagram shows the structure of the energy storage device 100 before the battery module 14 is assembled. The internal structure of the energy storage device 100 will now be further described. In other embodiments of the present application, the energy storage device 100 further includes a battery management system, but the present application is not limited thereto. The "and / or" relationship between two or more features in the text of the present application means any one of the two or more features, or a combination of any two or more of them. The "and / or" relationship between two or more features appearing in the context shall be interpreted in the same way.

[0067] Reference Figure 1 and Figure 2The energy storage device 100 includes a cabinet 101. A first space S1 within the cabinet 101 is suitable for accommodating two rows of battery modules 14. An inter-module air inlet 103 is formed between each adjacent pair of battery modules 14 in each row of battery modules 14. A main air inlet 104 is also provided at the bottom of the cabinet 101. The energy storage device 100 also includes a cabinet door 105, on which an air inlet structure 106 is provided. The bottom of the air inlet structure 106 spatially corresponds to the main air inlet 104. The bottom of the air inlet structure 106 is a hollow structure, allowing the fluid in the main air inlet 104 to enter the air inlet structure 106. The air inlet structure 106 has multiple vents 107 on one side close to the battery module 14. The vents 107 correspond to the inter-module air inlets 103 in spatial position. The vents 107 are suitable for passing the flowing medium in the main air inlet 104 into the inter-module air inlet 103 so that the flowing medium flows in the two rows of battery modules.

[0068] In this embodiment, the vent 107 is a rectangular structure, with a length ranging from 0.8m to 1m, preferably 0.838m in this embodiment; a width ranging from 9cm to 10cm, preferably 0.99cm in this embodiment. The air inlet structure is a rectangular structure, with a length ranging from 0.9m to 1.1m, preferably 0.982m in this embodiment; a width ranging from 0.2m to 0.3m, preferably 2.24m in this embodiment; and a height ranging from 0.9m to 1.1m, preferably 0.982m in this embodiment. The flow medium in the main air inlet 104 can be gas. Exemplarily, the length of the vent 107 is less than or equal to the length of the air inlet structure.

[0069] In this embodiment, the energy storage device 100 is internally provided with one or more battery racks 109, which are adapted to support battery modules 14. A separator 110 is provided between each adjacent column of battery modules 14, which is adapted to completely separate the two adjacent columns of battery modules 14. In this embodiment, the separator 110 divides the two columns of battery modules 14 into a left column of battery modules and a right column of battery modules. The left column of battery modules includes five battery modules 14, and the right column of battery modules includes five battery modules 14.

[0070] In other embodiments of the present application, multiple columns of battery modules 14 may be provided inside the energy storage device 100 , wherein each column of battery modules 14 may include multiple battery modules 14 , but the present application is not limited thereto.

[0071] Furthermore, the second space S2 of the cabinet 101 is suitable for accommodating the current conversion system 11 and the power distribution system 12. The length ratio of the first space S1 to the second space S2 in the vertical direction ranges from 3 to 4. For example, the length of the first space S1 can be 1.136m, and the length of the second space S2 can be 0.346m. In other embodiments of the present application, the second space S2 is also suitable for accommodating a battery management system (not shown), and the present application is not limited to this. In this embodiment, the second space S2 can be located above or below the first space S1, and the present application is not limited to this.

[0072] On the other hand, the cabinet 101 is further provided with a filter cotton 108 at the position of the main air inlet 104. The filter cotton 108 is used to filter the flowing medium entering the cabinet 101 from the main air inlet 104. For example, the filter cotton 108 can filter dust in the flowing medium and prevent the dust in the flowing medium from entering the interior of the cabinet 101.

[0073] Reference Figure 3 , Figure 3 A cross-sectional view of an outdoor energy storage device 100 is shown. Figure 3 As shown, a fan 111 and an air outlet 112 connected to the fan 111 are further provided on the top of the cabinet 101 . The fan 111 is suitable for discharging the flowing medium after entering the cabinet 101 from the air inlet structure 106 through the air outlet 112 .

[0074] Furthermore, a fire-fighting device (not shown) is provided on the top of the cabinet 101. The fire-fighting device is suitable for extinguishing fires in the energy storage device under predetermined conditions. For example, the fire-fighting device can be perfluoroacetone, which can extinguish fires in battery cells when they catch fire at high temperatures.

[0075] In this embodiment, after the battery modules 14 are fully assembled, the cabinet door 105 is closed, and the fluid medium within the main air inlet 104 enters the air inlet structure 106 through the hollow structure at the bottom of the cabinet door 105. The fluid medium then passes through each vent 107 in the air inlet structure of the cabinet door 105 and enters the inter-module air inlet 103 in the cabinet 101, thereby dissipating heat from each battery module 14. Simultaneously, the fan 111 at the top of the cabinet 101 is activated and continuously draws air, continuously drawing the fluid medium within the cabinet 101, which dissipates heat from the battery modules 14, to the top of the cabinet 101. The fluid medium removes the heat generated by the battery modules 14 during operation and is discharged through the air outlet 112, thereby achieving air cooling for the entire energy storage device 100.

[0076] Further, refer to Figure 4 , Figure 4FIG2 shows a schematic diagram of the front view of a battery module 14 in this embodiment. In this embodiment, the battery module 14 includes a cell group 201, a first end plate 202 and a second end plate 203, three fixing bars 204 and three insulating sheets 205. For example, in other embodiments of the present application, the battery module 14 may include one or more cell groups 201, one or more fixing bars 204 and one or more insulating sheets 205. Figure 4 The number of component configurations shown is intended as a limitation.

[0077] Specifically, each cell group 201 includes multiple cells cascaded along a first direction X. The first end plate 202 is located at the first end of the battery module 14 along the first direction X, and the second end plate 203 is located at the second end of the battery module 14 along the first direction X. The first and second ends are arranged opposite each other in the first direction X, and the two cell groups 201 are located between the first end plate 202 and the second end plate 203. The first end plate 202 and the second end plate 203 each have an end plate upper surface 206, which includes three end plate fixing portions 107. By way of example, the battery module 14 may include one or more cell groups 201. When the battery module 10 includes multiple cell groups 201, the multiple cell groups 201 may be connected by bonding fireproof and heat-insulating fabric.

[0078] In this embodiment, the fixing bar 204 is located on the first side surface S3 of the battery cell group 201, and each fixing bar 204 has an extension portion 2041 extending along the first direction X and a connecting portion 2042 located at both ends of the extension portion 2041. The connecting portions 2042 at both ends of each extension portion 2041 are suitable for being fixedly connected to the end plate fixing portion 207 of the upper end surface 206 of the end plate of the first end plate 202 and the second end plate 203, respectively.

[0079] On the other hand, the insulating sheet 205 is positioned between the first side surface S3 of the cell group 201 and each fixing bar 204. The width of the insulating sheet 205 along a second direction Y perpendicular to the first direction X is greater than or equal to the width of the fixing bar along the second direction Y. Exemplarily, the fixing bar 204 is a metal structure, and the insulating sheet 205 insulates the fixing bar 204 from the cell group 201, preventing the fixing bar 204 from interacting with the cells in the cell group 201 and potentially affecting the operating efficiency of the battery module 10. In this embodiment, the fixing bar 204 has two bent portions 2043, which enhance the fixing strength of the fixing bar 204.

[0080] On the other hand, the battery module 14 also includes two steel strips 209, each of which surrounds the battery cell group, and the extension direction of the steel strips 209 on the first side surface S3 when surrounding the battery cell group 201, the first battery cell end plate 2081, and the second battery cell end plate 2082 is parallel to the first direction X. The steel strips 209 are used to bundle the battery cell group 201, so that the connection between the individual battery cells in the battery cell group 201 is more secure, further improving the reliability of the battery module 14. In this embodiment, preferably, the insulating sheet 205 is also located between the first side surface S3 of the battery cell group 201 and each steel strip 209. The steel strips 209 are metal structures, and the insulating sheet 205 can insulate the steel strips 209 and the battery cell group 201, preventing the steel strips 209 from directly contacting and reacting with the battery cells in the battery cell group 201, thereby effectively preventing the steel strips 209 from affecting the operating efficiency of the battery module 10.

[0081] In this embodiment, the battery module 14 further includes a cover sheet 113, which is located on the first side surface S3 of the battery cell group 201 and at least covers the exposed area of ​​the first side surface S3. Figure 1 In the illustrated embodiment, the exposed area refers to all areas on the first side S3 except the steel strip 209, the fixing strip 204, and the insulating sheet 205. In other embodiments of the present application that do not include the steel strip 209, if the steel strip 209 structure is not provided, the exposed area refers to all areas on the first side S3 except the fixing strip 204 and the insulating sheet 205.

[0082] Preferably, the cover sheet 113 comprises a polymer phase change material, such as sodium sulfate, sodium acetate, calcium chloride, disodium hydrogen phosphate, carbonates, nitrates, sodium chloride, lithium fluoride, paraffin, fatty acids, or polyols. Depending on the selected material, the cover sheet 113 can transform from a solid to a liquid when the temperature exceeds a certain threshold. When the battery module 10 experiences thermal runaway, the temperature of the battery module 10 rises, and the cover sheet 113 transforms into a liquid to cool the battery module 10 or extinguish a fire, thereby improving the battery module 10's resistance to high temperatures and heat insulation and fire resistance.

[0083] The energy storage device provided in any embodiment of the present application adopts air cooling to dissipate heat from the battery module. The air cooling eliminates the need for liquid cooling for the energy storage device, and therefore eliminates the need for air conditioning or other equipment for heat dissipation, saving the cost of a liquid cooling unit. At the same time, the use of air cooling to dissipate heat from the energy storage device reduces the overall power consumption, thereby further improving system efficiency. Furthermore, the present application can filter the heat dissipation gas entering the interior of the energy storage device by placing filter cotton on the air inlet, thereby preventing dust and other interfering substances from entering the energy storage device and affecting the internal performance of the energy storage device.

[0084] The energy storage device provided in any embodiment of the present application can also integrate the battery management system and the power distribution system into the energy storage device, eliminate the upper cover structure of the battery module, and use fixing strips to fix the battery module, thereby saving internal space of the energy storage device and improving the integration of the energy storage device. In addition, the battery management system, current conversion system and power distribution system are integrated into the energy storage device, so that the energy storage device does not need to be connected to other external equipment, and the structure is simpler and more convenient to use.

[0085] The basic concepts have been described above. It will be apparent to those skilled in the art that the above disclosures are merely examples and do not limit the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and revisions to the present application. Such modifications, improvements, and revisions are suggested in the present application and remain within the spirit and scope of the exemplary embodiments of the present application.

[0086] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0087] Similarly, it should be noted that, in order to simplify the description of this application and thus facilitate understanding of one or more embodiments of the application, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than all the features of the individual embodiments disclosed above.

[0088] In some embodiments, numbers are used to describe the quantity of components and attributes. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the description and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0089] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. An energy storage device, characterized in that: include: Multiple battery modules; A cabinet, wherein the first space inside the cabinet is suitable for accommodating at least two rows of the battery modules, and an inter-module air inlet is formed between each two adjacent battery modules in each row of the battery modules, wherein a main air inlet is further provided at the bottom of the cabinet; and The cabinet door is provided with an air inlet structure, wherein: The bottom of the air inlet structure corresponds to the main air inlet in terms of spatial position; The bottom of the air inlet structure is a hollow structure, so that the flowing medium in the main air inlet can enter the air inlet structure; The air inlet structure has a plurality of vents on one side close to the battery module, and the vents correspond one-to-one to the inter-module air inlets in terms of spatial position. The vents are suitable for passing the flow medium in the total air inlet into the inter-module air inlet so that the flow medium flows in the two rows of battery modules.

2. The energy storage device according to claim 1, wherein It also includes a battery management system, a current conversion system and / or a power distribution system. The interior of the cabinet also includes a second space, and the second space of the cabinet is suitable for accommodating the battery management system, the current conversion system and / or the power distribution system.

3. The energy storage device according to claim 2, characterized in that The length ratio of the first space to the second space in the vertical direction ranges from 3 to 4.

4. The energy storage device according to claim 1, wherein The cabinet is further provided with filter cotton at the position of the main air inlet, and the filter cotton is used to filter the flow medium entering the cabinet from the main air inlet.

5. The energy storage device according to claim 1, wherein One or more battery racks are provided inside the energy storage device, and the battery racks are suitable for carrying the battery modules. A partition plate is provided between each two adjacent columns of the battery modules, and the partition plate is suitable for isolating each two adjacent columns of the battery modules.

6. The energy storage device according to claim 1, characterized in that A fan and an air outlet connected to the fan are also provided on the top of the cabinet. The fan is suitable for discharging the flowing medium after entering the cabinet from the main air inlet through the air outlet.

7. The energy storage device according to claim 1, wherein The top of the cabinet is also provided with a fire-fighting component, which is suitable for extinguishing a fire in the energy storage device under preset circumstances.

8. The energy storage device according to claim 1, wherein The air inlet structure is a rectangular parallelepiped structure, and the length of the air inlet structure ranges from 0.9m to 1.1m, the width ranges from 0.2m to 0.3m, and the height ranges from 1m to 1.2m.

9. The energy storage device according to claim 8, characterized in that The vent is a rectangular structure. The length of the vent is less than or equal to the length of the air inlet structure. The length of the vent is in the range of 0.8m to 1m, and the width is in the range of 9cm to 10cm.

10. The energy storage device according to any one of claims 1 to 9, characterized in that: The battery module comprises: One or more battery cell groups, each of the battery cell groups comprising a plurality of battery cells cascaded along a first direction; a first end plate and a second end plate, located at first and second ends of the battery module opposite to each other along the first direction, the one or more battery cell groups being located between the first end plate and the second end plate, the first end plate and the second end plate each having an end plate upper surface, the end plate upper surface including one or more end plate fixing portions; One or more fixing bars, located on the first side surface of the battery cell group, each fixing bar having an extension extending along the first direction and connecting portions located at both ends of the extension, the connecting portions at both ends of each extension being adapted to be fixedly connected to the end plate fixing portions on the upper end surfaces of the end plates of the first end plate and the second end plate, respectively; and One or more insulating sheets, each of which is located between the first side surface of the battery cell group and each of the fixing bars, wherein a width of the insulating sheet along a second direction perpendicular to the first direction is greater than or equal to a width of the fixing bar along the second direction.

11. The energy storage device according to claim 10, wherein: The battery module further includes one or more steel strips, each of which surrounds the battery cell group, and an extension direction of the steel strip on the first side surface when surrounding the battery cell group is parallel to the first direction.

12. The energy storage device according to claim 11, wherein: A covering sheet is also included. The covering sheet is located on the first side surface of the battery cell group and covers at least the exposed area of ​​the first side surface.

13. An energy storage system, characterized in that: Comprising one or more energy storage devices according to any one of claims 1 to 12.

Images