Battery pack, energy storage device and energy storage system

Abstract

The application discloses a battery pack, an energy storage device and an energy storage system, relates to the technical field of energy storage, and aims to solve the problem of low heat dissipation efficiency of a battery pack. The battery pack provided by the application comprises a shell, the shell is provided with a first side wall and a second side wall opposite to each other in a first direction, the area of the first side wall and the area of the second side wall are both larger than the area of the remaining side walls of the shell; a battery module is arranged in the shell; a direct current change module is arranged on the side of the first side wall away from the second side wall and is electrically connected with the battery module; a first heat dissipation structure is arranged on the side of the direct current change module away from the first side wall and is in contact with the direct current change module, and the coverage area of the first heat dissipation structure on the first side wall is larger than the area of the remaining side walls. The application is used for improving the heat dissipation efficiency of the direct current change module.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to a battery pack, energy storage device, and energy storage system. Background Technology

[0002] A battery pack typically includes a housing, battery modules housed inside the housing, and a heat dissipation structure on the surface of the housing. The heat dissipation structure relies on heat exchange with the external environment to dissipate the heat generated by the battery pack. However, in related technologies, the heat dissipation structure is located on a small surface of the housing (usually a relatively small sidewall), which cannot meet the heat dissipation requirements of the battery pack under high load operation. This results in heat not being dissipated in a timely and efficient manner, ultimately leading to low overall heat dissipation efficiency and affecting the performance and lifespan of the battery pack. Utility Model Content

[0003] This application provides a battery pack, an energy storage device, and an energy storage system that can solve the problem of poor heat dissipation in battery packs.

[0004] To achieve the above objectives, in a first aspect, the battery pack provided in this application includes: The housing has a first sidewall and a second sidewall disposed opposite to each other in a first direction, the area of ​​the first sidewall and the area of ​​the second sidewall being larger than the area of ​​the remaining sidewalls of the housing. The battery module is housed inside the casing; The DC converter module is located on the side of the first sidewall facing away from the second sidewall and is electrically connected to the battery module. The first heat dissipation structure is located on the side of the DC-DC converter that faces away from the first sidewall and is in contact with the DC-DC converter. The coverage area of ​​the first heat dissipation structure on the first sidewall is larger than the area of ​​the other sidewalls.

[0005] In some embodiments of this application, the remaining sidewalls include a third sidewall and a fourth sidewall disposed opposite each other in the second direction, the second direction intersecting the first direction, a first limiting part is provided on the third sidewall, and a second limiting part is provided on the fourth sidewall, the orthographic projection of the first limiting part in the second direction and the orthographic projection of the second limiting part in the second direction at least partially coincide.

[0006] In some embodiments of this application, one of the first limiting portion and the second limiting portion is a limiting protrusion and the other is a limiting groove, and the orthographic projection of the limiting protrusion in the second direction is located within the orthographic projection of the limiting groove in the second direction.

[0007] In some embodiments of this application, the third sidewall is provided with a first limiting portion at both edges in the third direction, and the fourth sidewall is provided with a second limiting portion at both edges in the third direction; the second limiting portion and the first limiting portion are provided in a one-to-one correspondence, wherein the third direction, the second direction and the first direction intersect each other.

[0008] In some embodiments of this application, a first mounting hole is provided on the first limiting part.

[0009] In some embodiments of this application, at least one of the remaining sidewalls is provided with a reinforcing rib structure.

[0010] In some embodiments of this application, the reinforcing rib structure includes multiple first reinforcing ribs and multiple second reinforcing ribs arranged intersectingly.

[0011] Secondly, the energy storage device provided in this application includes a plurality of battery packs as described in any of the above technical solutions, the plurality of battery packs being stacked along a second direction and adjacent battery packs being connected in series, the second direction intersecting with the first direction.

[0012] In some embodiments of this application, in the two side walls of the housings of two adjacent battery packs that are in contact, one side wall is provided with a first limiting part and the other side wall is provided with a second limiting part; and the first limiting part and the second limiting part on the two side walls that are in contact cooperate to limit the relative displacement of the two in a direction perpendicular to the second direction.

[0013] In some embodiments of this application, one of the first limiting portion and the second limiting portion is a limiting protrusion and the other is a limiting groove; the limiting protrusion of one battery pack is inserted into the limiting groove of an adjacent battery pack, and the energy storage device further includes: Connector, used to fix the groove wall of the limiting protrusion and the limiting groove.

[0014] In some embodiments of this application, the battery pack further includes a side panel, which is arranged around the outer periphery of the DC-DC converter module and its two ends are respectively connected to the first side wall and the first heat dissipation structure. The DC-DC converter module is disposed between the first side wall and the first heat dissipation structure and is in contact with the first heat dissipation structure.

[0015] In some embodiments of this application, the side panels of two adjacent battery packs are located on the same side of two end faces in the third direction, one end face is provided with a first socket and the other end face is provided with a second socket; the energy storage device also includes a wiring harness connector, one plug of the wiring harness connector is plugged into the first socket and the other plug is plugged into the second socket to connect the two adjacent battery packs in series; the third direction, the second direction and the first direction intersect each other.

[0016] In some embodiments of this application, on two facing sides of the side panels of two adjacent battery packs, a first connector is provided on one side and a second connector is provided on the other side. The first connector and the second connector are plugged and unplugged to connect the two adjacent battery packs in series.

[0017] In some embodiments of this application, an annular boss is provided on one side, and the annular boss is arranged around the outer periphery of the first connector; a receiving groove is provided on the other side, and the second connector is located in the receiving groove; when the annular boss is inserted into the receiving groove, the first connector and the second connector are plugged in and connected.

[0018] In some embodiments of this application, a sealing element is provided inside the receiving groove, and the sealing element seals the connection between the annular boss and the groove wall of the receiving groove.

[0019] Thirdly, the energy storage system provided in this application includes the energy storage device described in any of the above technical solutions, and the energy storage system further includes: A power inverter is positioned on one side of multiple battery packs in the second direction and is electrically connected to adjacent battery packs.

[0020] In some embodiments of this application, the energy storage system further includes: The second heat dissipation structure is disposed on one side of the power inverter in the first direction and is located on the same side as the first heat dissipation structure in the first direction. The second heat dissipation structure is disposed closer to the second side wall than the first heat dissipation structure.

[0021] In some embodiments of this application, the sum of the dimensions of the power inverter and the second heat dissipation structure in the first direction is less than the dimension of the battery pack in the first direction.

[0022] In some embodiments of this application, the first heat dissipation structure includes a first heat dissipation plate and a plurality of first heat dissipation parts. The first heat dissipation plate is connected to the first sidewall and in contact with the DC-DC converter module, and the plurality of first heat dissipation parts are disposed on the side of the first heat dissipation plate facing away from the first sidewall. The second heat dissipation structure includes a second heat dissipation plate and multiple second heat dissipation parts. The second heat dissipation plate is connected to the power inverter, and the multiple second heat dissipation parts are arranged on the side of the second heat dissipation plate facing away from the power inverter. The second heat sink is positioned closer to the second side wall than the first heat sink.

[0023] In some embodiments of this application, a first air duct is formed between two adjacent first heat dissipation parts, and a second air duct is formed between two adjacent second heat dissipation parts; wherein the extending direction of the first air duct intersects the extending direction of the second air duct.

[0024] In some embodiments of this application, the first heat dissipation part is a first heat dissipation fin, the second heat dissipation part is a second heat dissipation fin, and the extending direction of the first heat dissipation fin intersects the extending direction of the second heat dissipation fin.

[0025] In some embodiments of this application, at least one of the first heat dissipation portion and the second heat dissipation portion is a heat dissipation protrusion.

[0026] In some embodiments of this application, the heat dissipation protrusion is conical; when the first heat dissipation part is a heat dissipation protrusion, the diameter of the heat dissipation protrusion gradually decreases along the direction away from the first heat dissipation plate; when the second heat dissipation part is a heat dissipation protrusion, the diameter of the heat dissipation protrusion gradually decreases along the direction away from the second heat dissipation plate.

[0027] In some embodiments of this application, the first heat dissipation structure further includes a first heat dissipation fan, which is disposed on the side of the first heat dissipation plate having the first heat dissipation part, and the air outlet side of the first heat dissipation fan is disposed towards the first heat dissipation part. And / or, The second heat dissipation structure also includes a second heat dissipation fan, which is disposed on the side of the second heat dissipation plate having the second heat dissipation part, and the air outlet side of the second heat dissipation fan is disposed facing the second heat dissipation part.

[0028] In some embodiments of this application, the energy storage system further includes: The base is located on the other side of the multiple battery packs in the second direction and is connected to the housing of the adjacent battery pack.

[0029] In some embodiments of this application, the energy storage system further includes: The first limiting structure connects the base and the housing of the adjacent battery pack to limit their relative displacement in a direction perpendicular to the second direction. And / or, The second limiting structure connects the housing of the power inverter and the adjacent battery pack to limit their relative displacement in a direction perpendicular to the second direction.

[0030] In some embodiments of this application, the energy storage system further includes: The wall mount is configured to securely attach the battery pack to the target wall.

[0031] The above-mentioned technical solution of this application has at least the following beneficial effects: In this technical solution, since the areas of the first and second sidewalls are both larger than the areas of the remaining sidewalls of the housing, the DC-DC converter module is positioned on the side of the first sidewall facing away from the second sidewall, allowing it to directly contact the first heat dissipation structure. This establishes a direct heat dissipation path from the DC-DC converter module to the first heat dissipation structure and then to the external environment. Simultaneously, the first heat dissipation structure is located on the side of the DC-DC converter facing away from the first sidewall, and its coverage area on the first sidewall is larger than that of the remaining sidewalls. By fully utilizing the space of the large sidewalls of the housing, the contact area between the first heat dissipation structure and the external environment is increased, thereby quickly dissipating the heat generated by the DC-DC converter module to the surrounding environment. This significantly improves the heat dissipation efficiency of the battery pack, effectively ensuring the performance stability of the battery pack and extending its service life. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a perspective view of the battery pack in an embodiment of this application from one viewpoint; Figure 2 This is an exploded view of the battery pack in an embodiment of this application; Figure 3 This is a perspective view of the battery pack in an embodiment of this application from another viewpoint; Figure 4 This is a schematic diagram of the energy storage device in the embodiments of this application; Figure 5 This is a side view of the battery pack in the energy storage device in the embodiments of this application; Figure 6 yes Figure 4 Enlarged view of part A in the image; Figure 7 This is a schematic diagram of the structure of the first connector and the second connector in the energy storage device in the embodiments of this application; Figure 8 This is a schematic diagram of the energy storage system in an embodiment of this application; Figure 9 This is a side view of a first heat dissipation structure and a second heat dissipation structure in an energy storage system according to an embodiment of this application; Figure 10 This is a schematic diagram of the first heat dissipation structure and a second heat dissipation structure in the energy storage system according to the embodiments of this application; Figure 11 This is a schematic diagram of the first heat dissipation structure and another second heat dissipation structure in the energy storage system of this application embodiment; Figure 12 This is a schematic diagram of the first heat dissipation structure and another second heat dissipation structure in the energy storage system according to the embodiments of this application; Figure 13 This is a top view of the battery pack in an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures: 10-Battery pack; 1-Housing; 11-First sidewall; 12-Second sidewall; 13-Third sidewall; 131-First limiting part; 1311-First mounting hole; 1312-First connecting hole; 14-Fourth sidewall; 141-Second limiting part; 15-Reinforcing rib structure; 151-First reinforcing rib; 152-Second reinforcing rib; 16-Fifth sidewall; 17-Sixth sidewall; 18-Side panel; 181-End face; 182-Side side; 2-Battery module; 3-DC converter module; 4-First heat dissipation structure; 41-First... 1. Heat sink; 42. First heat sink; 5. Connector; 6. Wire harness connector; 61. Plug; 7. First connector; 71. Annular boss; 8. Second connector; 81. Receiving slot; 82. Seal; 20. Power inverter; 30. Second heat sink structure; 301. Second heat sink; 302. Second heat sink; 303. Second cooling fan; 40. Base; 50. Wall mount; 100. Hanging structure; 101. Hook; 200. Target wall surface; X. First direction; Z. Second direction; Y. Third direction. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] This application provides a battery pack, an energy storage device, and an energy storage system, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0040] Battery packs are key components in energy storage and supply systems, providing stable power support for various devices. During charging, an external power source inputs electrical energy into the battery pack, which is then managed and distributed by the battery management system, storing the electrical energy in the battery modules as chemical energy. During discharging, the chemical energy of the individual battery cells in the battery modules is converted into electrical energy, which is then output through the electrical system under the control of the battery management system to power the electrical devices.

[0041] A battery pack typically includes a housing, battery modules housed inside the housing, and a heat dissipation structure on the surface of the housing. The heat dissipation structure relies on heat exchange with the external environment to dissipate the heat generated by the battery pack. However, in related technologies, the heat dissipation structure is located on a small surface of the housing (usually a relatively small sidewall), which cannot meet the heat dissipation requirements of the battery pack under high load operation. This results in heat not being dissipated in a timely and efficient manner, ultimately leading to low overall heat dissipation efficiency and affecting the performance and lifespan of the battery pack.

[0042] Therefore, such as Figure 1 and Figure 2 As shown, this application provides a battery pack 10, which includes a housing 1, a battery module 2, a DC-DC converter 3, and a first heat dissipation structure 4. The housing 1 has a first sidewall 11 and a second sidewall 12 disposed opposite each other in a first direction X. The area of ​​the first sidewall 11 and the area of ​​the second sidewall 12 are both larger than the areas of the remaining sidewalls of the housing 1. The battery module 2 is disposed inside the housing 1. The DC-DC converter 3 is disposed on the side of the first sidewall 11 opposite to the second sidewall 12 and is electrically connected to the battery module 2. The first heat dissipation structure 4 is disposed on the side of the DC-DC converter 3 opposite to the first sidewall 11 and is in contact with the DC-DC converter 3. The coverage area of ​​the first heat dissipation structure 4 on the first sidewall 11 is larger than the area of ​​the remaining sidewalls.

[0043] In this technical solution, since the areas of the first sidewall 11 and the second sidewall 12 are both larger than the areas of the other sidewalls of the housing 1, the DC-DC converter 3 is arranged on the side of the first sidewall 11 facing away from the second sidewall 12, and it is in direct contact with the first heat dissipation structure 4. This creates a direct heat dissipation path from the DC-DC converter 3 to the first heat dissipation structure 4, and then to the external environment. Meanwhile, the first heat dissipation structure 4 is located on the side of the DC-DC converter 3 facing away from the first sidewall 11, and its coverage area on the first sidewall 11 is larger than the area of ​​the other sidewalls. By fully utilizing the space of the large sidewalls of the housing 1, the contact area between the first heat dissipation structure 4 and the external environment can be increased, thereby quickly dissipating the heat generated by the DC-DC converter 3 to the surrounding environment, significantly improving the heat dissipation efficiency of the battery pack 10, and effectively ensuring the performance stability of the battery pack 10 and extending its service life.

[0044] Please refer to Figure 2 and Figure 3 In this embodiment, the remaining sidewalls include a third sidewall 13 (top sidewall) and a fourth sidewall 14 (bottom sidewall) disposed opposite each other in the second direction Z, where the second direction Z intersects the first direction X. A first limiting part 131 is provided on the third sidewall 13, and a second limiting part 141 is provided on the fourth sidewall 14. The orthographic projection of the first limiting part 131 in the second direction Z and the orthographic projection of the second limiting part 141 in the second direction Z at least partially overlap. With the above design, the first limiting part 131 and the second limiting part 141 of adjacent battery packs 10 cooperate with each other, enabling precise stacking in the direction perpendicular to the second direction Z (i.e., laterally), thereby enhancing the overall stability and reliability of the stacked structure. Specifically, when multiple battery packs 10 are assembled layer by layer along the stacking direction, the first limiting part 131 and the second limiting part 141 of adjacent battery packs 10 cooperate with each other to form a cooperative constraint effect in the direction perpendicular to the second direction Z (i.e., the lateral direction). This not only ensures the positional stability of individual battery packs 10 during the stacking process, but also further strengthens the structural stability of the entire battery pack stack through the layer-by-layer limiting effect, thereby reducing the risk of battery pack 10 displacement or structural loosening caused by external factors such as vibration and impact. For example, the third sidewall 13 is the top sidewall, and the fourth sidewall 14 is the bottom sidewall. That is, with the ground as the reference plane, the fourth sidewall 14 is set closer to the ground than the third sidewall 13, and the orthographic projection of the first limiting part 131 on the fourth sidewall 14 at least partially overlaps with the orthographic projection of the second limiting part 141 on the fourth sidewall 14.

[0045] In this design, one of the first limiting part 131 and the second limiting part 141 is a limiting protrusion, and the other is a limiting groove. The orthographic projection of the limiting protrusion in the second direction Z lies within the orthographic projection of the limiting groove in the second direction Z. That is, the orthographic projection of the limiting protrusion on the third sidewall 13 or the fourth sidewall 14 lies within the orthographic projection of the limiting groove on the same sidewall. Therefore, when the battery packs 10 are stacked along the second direction Z, since the orthographic projection of the limiting protrusion in the second direction Z lies within the orthographic projection of the limiting groove in the second direction Z, the limiting protrusion can be completely placed within the limiting groove, thus effectively constraining the two adjacent battery packs 10 in all directions perpendicular to the stacking direction or the second direction Z. At the same time, the cooperative design of the limiting protrusion and the limiting groove makes the installation process of the battery packs 10 simpler and more convenient. When stacking the battery packs 10, simply align the limiting protrusion with the limiting groove and insert it to quickly complete the positioning and connection of adjacent battery packs 10. Furthermore, the limiting protrusion is embedded in the limiting groove in the second direction Z, without occupying excessive additional space, which helps to improve the overall space utilization of the battery pack 10 and makes the design of the battery pack 10 more compact. It should be noted that, as... Figure 2 and Figure 3 As shown in the accompanying drawings, only one embodiment is illustrated where the first limiting portion 131 is a limiting protrusion and the second limiting portion 141 is a limiting groove. Of course, in other embodiments not shown in the accompanying drawings, the first limiting portion 131 may also be a limiting groove and the second limiting portion 141 may also be a limiting protrusion.

[0046] In some embodiments, the third sidewall 13 has a first limiting portion 131 at each of its two edges in the third direction Y, and the fourth sidewall 14 has a second limiting portion 141 at each of its two edges in the third direction Y. The second limiting portion 141 corresponds to the first limiting portion 131. The third direction Y, the second direction Z, and the first direction X intersect each other. Specifically, the first direction X, the second direction Z, and the third direction Y can be approximately perpendicular to each other; for example, the included angle between each pair of the first direction X, the second direction Z, and the third direction Y can be 85° to 90°.

[0047] The above design achieves two key benefits. First, it precisely guides the placement of adjacent battery packs 10 during stacking, ensuring that both edges of each battery pack 10 in the third Y direction are accurately aligned with their neighbors. Second, the coordinated action of the dual limiting parts (first limiting part 131 or second limiting part 141) provides reliable support and constraint to adjacent battery packs 10, forming a coordinated arrangement of multiple limiting and fixing points. This ensures both the accuracy of the battery pack 10's position during stacking and significantly enhances the stability of the connection, effectively improving the reliability of the connection between adjacent battery packs 10 and ensuring the structural stability of the stacked battery packs 10.

[0048] In other embodiments, the first limiting part 131 and the second limiting part 141 are both permanent magnets. The attraction between the permanent magnets on the contact surfaces of adjacent battery packs 10 is used to tightly attract the two adjacent battery packs 10 together, so as to quickly complete the positioning and connection of the adjacent battery packs 10.

[0049] Please continue to refer to Figure 1 In this embodiment, a first hooking hole 1311 is provided on the first limiting part 131. During the hoisting and handling of the battery pack 10, the first hooking hole 1311 provides a clear connection position for the hook 101 of the hoisting structure 100. The operator does not need to spend time aligning the hooks; they can simply insert or extend the hooks 101 of the hoisting structure 100 directly into the first hooking hole 1311 to quickly complete the connection of the hooks 101. This simplifies the handling of the battery pack 10 and improves handling efficiency.

[0050] In the embodiment where "a plurality of first limiting portions 131 are provided at both edges of the third sidewall 13 in the third direction Y," a first hooking hole 1311 is provided on each of the first limiting portions 131 at both edges of the third sidewall 13 in the third direction Y. Furthermore, at least two of the plurality of first limiting portions 131 located on the same side in the third direction Y are provided with the first hooking hole 1311. Therefore, when transporting the battery pack 10, the hooks 101 of the lifting structure 100 can be hung in the plurality of first hooking holes 1311, making the force distribution of the battery pack 10 more even, thereby better balancing the weight of the battery pack 10 and reducing the risk of the battery pack 10 tilting due to uneven force distribution.

[0051] During transportation, installation, and use, the battery pack 10's casing 1 is inevitably subjected to various external pressures, such as the pressure during stacking and the impact force during collisions. Therefore, this application provides a reinforcing rib structure 15 on at least one of the remaining sidewalls of the casing 1, such as... Figure 1 and Figure 3 As shown. The reinforcing rib structure 15 can increase the effective load-bearing area of ​​the sidewall of the housing 1 and the overall rigidity of the structure, thereby effectively dispersing external pressure and avoiding pressure concentration in local areas of the housing 1, thus reducing the risk of deformation or damage to the housing 1. For example, when multiple battery packs 10 are stacked together, the sidewall of the lower battery pack 10 will be subjected to pressure from the upper battery pack 10. The reinforcing rib structure 15 can enhance the load-bearing capacity of the sidewall, ensuring the shape and structural integrity of the housing 1 of the battery pack 10.

[0052] For example, the reinforcing rib structure 15 includes multiple first reinforcing ribs 151 and multiple second reinforcing ribs 152 arranged intersectingly. Compared to a technical solution that only provides reinforcing ribs in a single direction, the technical solution that uses multiple first reinforcing ribs 151 and multiple second reinforcing ribs 152 intersectingly can provide support for the sidewalls of the housing 1 from multiple directions. Through the staggered connection of the first reinforcing ribs 151 and the second reinforcing ribs 152, external forces are no longer concentrated in a certain local area of ​​the housing 1, but are transmitted and evenly diffused to the entire structure along the intersecting rib paths. When the battery pack 10 is subjected to external forces, the stress is transmitted and dispersed through the first reinforcing ribs 151 and the second reinforcing ribs 152, rather than being concentrated in a certain local area. This avoids cracking or damage to local areas of the housing 1 due to excessive stress, helps to improve the resistance to damage of the housing 1, and extends the overall service life of the battery pack 10.

[0053] Furthermore, in practical applications, the quantity and size of the first reinforcing rib 151 and / or the second reinforcing rib 152 can be flexibly adjusted according to the specific working conditions of the battery pack 10 (such as load-bearing strength, usage environment, etc.) to balance manufacturing costs and performance requirements while ensuring structural strength.

[0054] Exemplarily, the remaining sidewalls include a third sidewall 13 and a fourth sidewall 14 disposed opposite each other in the second direction Z, and a fifth sidewall 16 and a sixth sidewall 17 disposed opposite each other in the third direction Y. In the embodiment where "at least one of the remaining sidewalls of the housing 1 is provided with a reinforcing rib structure 15," that is, at least one of the third sidewall 13, fourth sidewall 14, fifth sidewall 16, and sixth sidewall 17 is provided with a reinforcing rib structure 15. For example, in this application, reinforcing rib structures 15 are provided on all three sidewalls of the housing 1: third sidewall 13, fourth sidewall 14, fifth sidewall 16, and sixth sidewall 17. Furthermore, to further enhance the structural strength of the housing 1, the reinforcing rib structures 15 on adjacent sidewalls of the third sidewall 13, fourth sidewall 14, fifth sidewall 16, and sixth sidewall 17 are connected.

[0055] In the case where a reinforcing rib structure 15 is provided on the third side wall 13, a second mounting hole may also be provided on the reinforcing rib structure 15 on the third side wall 13. Alternatively, in the case where reinforcing rib structures 15 are provided on both the fifth side wall 16 and the sixth side wall 17, a second mounting hole may be provided on the reinforcing rib structure 15 on the fifth side wall 16 and on the reinforcing rib structure 15 on the sixth side wall 17.

[0056] like Figure 3As shown, when a reinforcing rib structure 15 is provided on the third sidewall 13 and / or the fourth sidewall 14, multiple first reinforcing ribs 151 in the reinforcing rib structure 15 extend along the first direction X and are spaced apart in the third direction Y. Simultaneously, multiple second reinforcing ribs 152 in the reinforcing rib structure 15 extend along the third direction Y and are spaced apart in the first direction X. Figure 1 As shown, when a reinforcing rib structure 15 is provided on the fifth sidewall 16 and / or the sixth sidewall 17, a plurality of first reinforcing ribs 151 in the reinforcing rib structure 15 extend along the first direction X and are spaced apart in the second direction Z. At the same time, a plurality of second reinforcing ribs 152 in the reinforcing rib structure 15 extend along the second direction Z and are spaced apart in the first direction X.

[0057] In the case where reinforcing rib structures 15 are provided on the third side wall 13 and the fourth side wall 14, the reinforcing rib structures 15 on the third side wall 13 and the fourth side wall 14 are symmetrically arranged. In the case where reinforcing rib structures 15 are provided on the fifth side wall 16 and the sixth side wall 17, the reinforcing rib structures 15 on the fifth side wall 16 and the sixth side wall 17 are symmetrically arranged.

[0058] Please refer to Figure 4 In this embodiment, the energy storage device provided by this application includes multiple battery packs 10 as described in any of the above technical solutions. The multiple battery packs 10 are stacked along the second direction Z, and adjacent battery packs 10 are connected in series. The second direction Z intersects the first direction X. Since the multiple battery packs 10 in this energy storage device and the aforementioned battery packs 10 have the same technical features, they can solve the same technical problems and achieve the same technical effects. The multiple battery packs 10 stacked along the second direction Z can fully utilize vertical space, significantly reducing the footprint of the energy storage device on the horizontal ground.

[0059] Please combine Figure 2 , Figure 3 and Figure 4In the two sidewalls of the housings 1 of two adjacent battery packs 10 that are in contact, one sidewall is provided with a first limiting part 131 and the other sidewall is provided with a second limiting part 141. Furthermore, the first limiting part 131 and the second limiting part 141 on the two contacting sidewalls cooperate with each other to limit the relative displacement of the two adjacent battery packs 10 in the direction perpendicular to the second direction Z, ensuring that the two adjacent battery packs 10 do not have relative displacement in the direction perpendicular to the second direction Z (i.e., laterally), so that the two adjacent battery packs 10 remain relatively fixed in the direction perpendicular to the second direction Z. Specifically, the housing 1 of each battery pack 10 has a third sidewall 13 and a fourth sidewall 14 disposed opposite each other in the third direction Y. The two sidewalls of the housings 1 of two adjacent battery packs 10 that are in contact are the third sidewall 13 of one battery pack 10's housing 1 and the fourth sidewall 14 of the adjacent battery pack 10's housing 1.

[0060] Please refer to Figure 4 and Figure 5 In this embodiment, one of the first limiting part 131 and the second limiting part 141 is a limiting protrusion and the other is a limiting groove. The limiting protrusion of one battery pack 10 is inserted into the limiting groove of an adjacent battery pack 10 to achieve a positioning connection between two adjacent battery packs 10. Based on this, the energy storage device also includes a connector 5, which fixes the groove walls of the limiting protrusion and the limiting groove together. The connector 5 can fix the limiting protrusion and the groove walls of the limiting groove together to prevent the limiting protrusion from coming out of the limiting groove or from sliding relative to it, further enhancing the lateral connection stability of adjacent battery packs 10, thereby ensuring that the entire energy storage device can remain stable under complex stress environments.

[0061] like Figure 2 and Figure 5 As shown, the third sidewall 13 has a first limiting part 131 at each of its two edges in the third direction Y, and at least one first limiting part 131 at each edge has a first connecting hole 1312. In the second direction Z, a second limiting part 141, which is disposed opposite to the first limiting part 131, has a second connecting hole (not shown in the figure) at its corresponding position. For example, the connector 5 is a fastening bolt, which passes through the first connecting hole 1312 and the second connecting hole, thereby fixing the limiting protrusion to the groove wall of the limiting groove. Alternatively, in some other embodiments, the connector 5 includes a buckle and a locking hole that cooperate with each other, with a hook provided on one of the first limiting part 131 and the second limiting part 141, and an opening provided on the other, to achieve a snap-fit ​​engagement between the two.

[0062] In the case where one of the first limiting part 131 and the second limiting part 141 is a limiting protrusion and the other is a limiting groove, the limiting protrusion is non-cylindrical in shape, and the limiting groove is matched in shape. For example, the limiting protrusion is a semi-circular limiting plate, and the limiting groove is a semi-circular groove with an arc-shaped bottom.

[0063] Please combine Figure 2 , Figure 4 and Figure 6 In this embodiment, the battery pack 10 further includes a side panel 18. The side panel 18 is arranged around the outer periphery of the DC-DC converter 3, and its two ends are respectively connected to the first side wall 11 and the first heat dissipation structure 4. The DC-DC converter 3 is disposed between the first side wall 11 and the first heat dissipation structure 4, and is in contact with the first heat dissipation structure 4. Specifically, the side panel 18, the first side wall 11, and the first heat dissipation structure 4 together form a closed chamber, in which the DC-DC converter 3 is disposed, so that the heat of the DC-DC converter 3 is concentrated in the relatively closed space, reducing the disorderly diffusion of heat to the surrounding environment. At the same time, the DC-DC converter 3 is in direct contact with the first heat dissipation plate 41, which can form an efficient heat conduction path to quickly dissipate the heat of the DC-DC converter 3 and the chamber. Furthermore, the blocking effect of the side panel 18 allows the heat to be dissipated more concentratedly through the first heat dissipation plate 41, thereby further enhancing the heat dissipation effect of the battery pack 10. Exemplarily, the side panel 18 and the first heat dissipation structure 4 can be an integral structure.

[0064] Please combine Figure 4 and Figure 6 In this embodiment, the side panels 18 of two adjacent battery packs 10 have two end faces 181 on the same side in the third direction Y. One end face 181 is provided with a first socket, and the other end face 181 is provided with a second socket. The energy storage device also includes a wiring harness connector 6. One plug 61 of the wiring harness connector 6 is plugged into the first socket, and the other plug 61 is plugged into the second socket to connect the two adjacent battery packs 10 in series. Thus, when assembling the battery packs 10, the operator only needs to align the two plugs 61 of the wiring harness connector 6 with the first socket and the second socket respectively, and then directly insert them to complete the series connection of the adjacent battery packs 10. When it is necessary to disassemble, maintain, or reconfigure the battery packs 10, the two adjacent battery packs 10 can be quickly separated by simply unplugging the plugs 61 of the wiring harness connector 6. The operation process is simple and efficient, which helps to save time and labor costs.

[0065] For example, each side panel 18 has a first socket and a second socket arranged at intervals along the second direction Z on its end face 181. In two adjacent battery packs 10, the first socket in one battery pack 10 and the second socket in the adjacent battery pack 10 are electrically connected by a wire harness connector 6.

[0066] Specifically, the DC-DC converter module 3 can boost the DC power output from the battery module 2 and output the boosted DC power to the DC bus, thereby enabling the energy storage device to output greater power. Placing the first and second sockets on the side panel 18 around the DC-DC converter module 3 not only facilitates electrical connection between the first and second sockets and the corresponding cable terminals of the DC-DC converter module 3, but also effectively simplifies the wiring path.

[0067] Please refer to Figure 7 In this embodiment, on the two facing sides 182 of the side panels 18 of two adjacent battery packs 10, a first connector 7 is provided on one side 182 and a second connector 8 is provided on the other side 182. The first connector 7 and the second connector 8 are plugged in and out to connect the two adjacent battery packs 10 in series. When assembling the battery packs 10, the operator only needs to align the first connector 7 and the second connector 8 and insert them directly to quickly complete the series connection of the adjacent battery packs 10. During maintenance or reconfiguration, the battery packs 10 can be separated by unplugging the connectors. The operation process is simple and intuitive, which helps to save time and labor costs for assembly and disassembly.

[0068] Furthermore, one side 182 is provided with an annular boss 71, which surrounds the outer periphery of the first connector 7. The other side 182 is provided with a receiving groove 81, within which the second connector 8 is located and exposed. When the annular boss 71 is inserted into the receiving groove 81, the first connector 7 and the second connector 8 are connected. This design has a dual core advantage: firstly, the cooperation between the annular boss 71 and the receiving groove 81 provides precise positioning guidance for the first connector 7 and the second connector 8. When the operator brings the sides 182 of the side panels 18 of adjacent battery packs 10 close together, the annular boss 71 can accurately embed into the receiving groove 81, guiding the first connector 7 and the second connector 8 to automatically align and precisely connect. Secondly, when the annular boss 71 is fully inserted into the receiving groove 81, a tight fitting structure is formed between the two, which significantly improves the stability of the connection between the first connector 7 and the second connector 8, and prevents the first connector 7 and the second connector 8 from loosening or separating due to external forces such as vibration and impact during use, thereby ensuring the long-term reliability of the electrical connection.

[0069] Based on the above embodiments, a sealing element 82 is provided inside the receiving groove 81, which seals the annular boss 71 and the groove wall of the receiving groove 81. Thus, through the sealing effect of the sealing element 82, a relatively clean and dry working environment can be created for the first connector 7 and the second connector 8, reducing the risk of failure caused by the intrusion of external impurities and improving the reliability and service life of the connection between the first connector 7 and the second connector 8. Exemplarily, the sealing element 82 is a sealing gasket, which is fixedly disposed at the bottom of the receiving groove 81 and surrounds the outer periphery of the second connector 8. When the first connector 7 and the second connector 8 are connected, the sealing gasket forms a tight abutment between the annular boss 71 and the bottom of the receiving groove 81, thereby forming a sealing barrier between the annular boss 71 and the bottom of the receiving groove 81. Alternatively, the sealing element 82 is a sealing ring, which is sleeved on the outer periphery of the annular boss 71. When the first connector 7 and the second connector 8 are connected, the sealing ring can form a continuous and complete sealing interface between the annular boss 71 and the groove wall of the receiving groove 81.

[0070] like Figure 8 As shown, in this embodiment, the energy storage system provided by this application includes the energy storage device described in any of the above technical solutions. The energy storage system also includes a power inverter 20, which is disposed on one side of the plurality of battery packs 10 in the second direction Z and electrically connected to adjacent battery packs 10. Since the battery packs 10 in the energy storage device of the energy storage system provided by this application have the same technical features as the battery packs 10 described in any of the above technical solutions, they can solve the same technical problems and achieve the same technical effects. In addition, the power inverter 20 is used to realize bidirectional conversion between DC and AC power: it can convert the DC power output by the energy storage device into AC power to supply external loads or connect to the grid, and it can also reverse the conversion of the AC power output by the grid into DC power to charge the energy storage device.

[0071] Please combine Figure 8 and Figure 9The energy storage system also includes a second heat dissipation structure 30, which is disposed on one side of the power inverter 20 in the first direction X, and is located on the same side as the first heat dissipation structure 4 in the first direction X. The second heat dissipation structure 30 is disposed closer to the second sidewall 12 relative to the first heat dissipation structure 4. In this technical solution, by arranging the second heat dissipation structure 30 relative to the direction closer to the front sidewall of the first heat dissipation structure 4, the hot airflow of the power inverter 20 and the hot airflow of the battery pack 10 can be staggered in the second direction Z. Specifically, the hot air discharged from the first heat dissipation structure 4 of the battery pack 10 is further away from the front sidewall than the hot air discharged from the second heat dissipation structure 30 of the power inverter 20, which can effectively prevent the hot air discharged from the first heat dissipation structure 4 from directly impacting the second heat dissipation structure 30, reduce the airflow interference of the first heat dissipation structure 4 on the second heat dissipation structure 30, and ensure that the heat dissipation paths of the two are independent, thereby improving the overall heat dissipation efficiency of the energy storage system.

[0072] Based on the above embodiments, the sum of the dimensions of the power inverter 20 and the second heat dissipation structure 30 in the first direction X is less than the dimension of the battery pack 10 in the first direction X. In other words, by controlling the total dimension of the power inverter 20 and the second heat dissipation structure 30 in the first direction X to be less than the dimension of the battery pack 10, a layout space is created for the second heat dissipation structure 30 to be offset towards the second sidewall 12 (front sidewall) of the battery pack 10. Based on this, it is more convenient and reasonable to achieve the arrangement of the second heat dissipation structure 30 relative to the first heat dissipation structure 4, closer to the second sidewall 12 (front sidewall).

[0073] Please refer to Figure 9 and Figure 10 In this embodiment, the first heat dissipation structure 4 includes a first heat dissipation plate 41 and a plurality of first heat dissipation parts 42. The first heat dissipation plate 41 is connected to the first sidewall 11, and the plurality of first heat dissipation parts 42 are disposed on the side of the first heat dissipation plate 41 facing away from the first sidewall 11. The second heat dissipation structure 30 includes a second heat dissipation plate 301 and a plurality of second heat dissipation parts 302. The second heat dissipation plate 301 is connected to the power inverter 20, and the plurality of second heat dissipation parts 302 are disposed on the side of the second heat dissipation plate 301 facing away from the power inverter 20. The second heat dissipation plate 301 is disposed closer to the second sidewall 12 relative to the first heat dissipation plate 41, so that the second heat dissipation structure 30 is disposed closer to the second sidewall 12 (front sidewall) relative to the first heat dissipation structure 4.

[0074] Specifically, since the first heat dissipation part 42 is located on the side of the first heat dissipation plate 41 facing away from the first sidewall 11, the heat from the DC-DC converter module 3 can be further conducted from the first heat dissipation plate 41 to the first heat dissipation part 42. The first heat dissipation part 42 typically adopts a structure with a large surface area, such as heat dissipation fins or heat dissipation pillars. A larger heat dissipation area allows heat to be dissipated to the surrounding environment more efficiently, accelerating the heat dissipation rate, thereby effectively reducing the temperature of the battery pack 10, ensuring that the battery pack 10 always operates within a suitable temperature range, which helps to improve the performance of the battery pack 10 and extend its service life. Similarly, the second heat dissipation plate 301 is directly connected to the power inverter 20, forming a direct heat conduction path. The second heat dissipation part 302 is located on the side of the second heat dissipation plate 301 facing away from the power inverter 20, which can further conduct and diffuse the absorbed heat away from the power inverter 20, avoiding the accumulation of heat around the power inverter 20, forming an efficient heat transfer and diffusion path, and significantly improving heat dissipation efficiency.

[0075] Based on the above embodiments, a first air duct is formed between two adjacent first heat dissipation parts 42; a second air duct is formed between two adjacent second heat dissipation parts 302. The extension directions of the first and second air ducts intersect. That is, the heat flow direction of the battery pack 10 is consistent with the extension direction of the first air duct, and the heat flow direction of the power inverter 20 is consistent with the extension direction of the second air duct. By making the extension directions of the first and second air ducts intersect, a staggered heat flow path can be formed, causing the heat flow directions of the battery pack 10 and the power inverter 20 to be staggered. This can, to a certain extent, avoid mutual interference between the heat flows of the battery pack 10 and the power inverter 20, ensuring that both the battery pack 10 and the power inverter 20 can dissipate heat efficiently.

[0076] like Figure 10 As shown, in this embodiment, the first heat dissipation part 42 is a first heat dissipation fin, and the second heat dissipation part 302 is a second heat dissipation fin. The extending directions of the first heat dissipation fin intersect with the extending directions of the second heat dissipation fin. Therefore, by configuring the first and second heat dissipation fins, the contact area between the heat dissipation structure and the surrounding air can be increased, accelerating the diffusion of heat from the surface of the heat dissipation structure into the air, thereby improving the heat dissipation efficiency of the energy storage system and enabling the energy storage system to dissipate heat in a shorter time. Specifically, the first heat dissipation fin extends along the second direction Z, and the second heat dissipation fin extends along the third direction Y. Or, as... Figure 11 As shown, in this embodiment, the first heat dissipation fin extends along the second direction Z, and the second heat dissipation fin is inclined relative to the first heat dissipation fin, with an inclination angle of less than 90 degrees between them.

[0077] Please refer to Figure 12At least one of the first heat dissipation part 42 and the second heat dissipation part 302 is a heat dissipation protrusion. The multi-directional heat dissipation capability of the heat dissipation protrusion allows it to cover a large heat dissipation area within a limited space. The heat dissipation protrusion can disperse heat to the surrounding air through multi-directional heat conduction paths, avoiding local heat accumulation.

[0078] It should be noted that this application Figure 12 The illustration only shows an embodiment where the second heat dissipation part 302 is a heat dissipation protrusion and the first heat dissipation part 42 is a heat dissipation fin. In other embodiments not shown in the accompanying drawings, the second heat dissipation part 302 may also be a heat dissipation fin and the first heat dissipation part 42 may be a heat dissipation protrusion. Alternatively, both the first heat dissipation part 42 and the second heat dissipation part 302 may be heat dissipation protrusions.

[0079] Based on this, the heat dissipation protrusion is conical. When the first heat dissipation part 42 is a heat dissipation protrusion, the diameter of the heat dissipation protrusion gradually decreases along the direction away from the first heat dissipation plate 41; when the second heat dissipation part 302 is a heat dissipation protrusion, the diameter of the heat dissipation protrusion gradually decreases along the direction away from the second heat dissipation plate 301. The conical structure allows heat to be concentrated and transferred from the larger contact area at the bottom to the smaller area at the top. During the process of heat transfer from the heat dissipation plate (first heat dissipation plate 41 and / or second heat dissipation plate 301) to the heat dissipation protrusion, the larger contact area at the bottom can more effectively absorb the heat on the heat dissipation plate, and then the gradually tapering shape concentrates and guides the heat to the top, causing the heat to accumulate in a smaller area, thereby increasing the temperature gradient on the surface of the heat dissipation protrusion and facilitating faster heat dissipation to the surrounding environment.

[0080] In the manufacturing process, a conical heat dissipation protrusion formed by the draft angle can create a specific tilt angle on its surface. When the heat dissipation protrusion has a suitable draft angle, the mold can smoothly separate from it during demolding, avoiding damage to the surface of the protrusion or the mold due to excessive friction. This not only improves production efficiency but also reduces the product defect rate and lowers production costs.

[0081] In some embodiments, the first heat dissipation structure 4 further includes a first cooling fan, which is disposed on the side of the first heat sink 41 having the first heat dissipation portion 42, with the exhaust side of the first cooling fan facing the first heat dissipation portion 42. The first cooling fan generates directional airflow by actively rotating, thereby increasing the contact speed and flow rate between the air and the surface of the first heat dissipation fins / heat dissipation protrusions. The high-speed airflow generated by the first cooling fan can more quickly sweep across the surface of the first heat dissipation portion 42, promptly carrying away heat and further improving the heat dissipation efficiency of the first heat dissipation structure 4.

[0082] In some embodiments, the second heat dissipation structure 30 further includes a second cooling fan 303, which is disposed on the side of the second heat sink 301 having the second heat dissipation portion 302, with the exhaust side of the second cooling fan 303 facing the second heat dissipation portion 302. The second cooling fan 303 generates directional airflow through active rotation, increasing the contact speed and flow rate between the air and the surface of the second heat dissipation fins / heat dissipation protrusions. The high-speed airflow generated by the second cooling fan 303 can more quickly sweep across the surface of the second heat dissipation portion 302, promptly carrying away heat and further improving the heat dissipation efficiency of the second heat dissipation structure 30.

[0083] Specifically, when the first heat dissipation part 42 is a first heat dissipation fin, the first cooling fan can be located on one side of the extension direction of the first heat dissipation fin, and the airflow blown out by the exhaust side of the first cooling fan can smoothly enter the first air duct defined by two adjacent first heat dissipation fins. When the second heat dissipation part 302 is a second heat dissipation fin, the second cooling fan 303 can be located on one side of the extension direction of the second heat dissipation fin, and the airflow blown out by the exhaust side of the second cooling fan 303 can smoothly enter the second air duct defined by two adjacent second heat dissipation fins.

[0084] In other embodiments, the first heat dissipation structure 4 further includes a first cooling fan, which is disposed on the side of the first heat dissipation plate 41 having the first heat dissipation part 42, and the exhaust side of the first cooling fan faces the first heat dissipation part 42. Meanwhile, the second heat dissipation structure 30 further includes a second cooling fan 303, which is disposed on the side of the second heat dissipation plate 301 having the second heat dissipation part 302, and the exhaust side of the second cooling fan 303 faces the second heat dissipation part 302. The first cooling fan and the second cooling fan 303 have the same beneficial effects as the first cooling fan and the second cooling fan 303 described above, and will not be repeated here.

[0085] Please continue to refer to Figure 8In this embodiment, the energy storage system also includes a base 40, which is disposed on the other side of the plurality of battery packs 10 in the second direction Z. A power inverter 20 is disposed on one side of the plurality of battery packs 10 in the second direction Z and connected to the housing 1 of the adjacent battery packs 10. The base 40 provides a supporting foundation for the entire energy storage system. When the base 40 is placed or fixed to the ground, it isolates the battery packs 10 and the power inverter 20 from the ground, preventing damage to the equipment from ground moisture or water accumulation. Furthermore, the base 40 provides a unified installation platform for the battery packs 10 and the power inverter 20. During installation, operators can accurately place the battery packs 10 and the power inverter 20 on the base 40 according to design requirements. Simultaneously, the presence of the base 40 makes the installation height of the equipment more suitable, facilitating subsequent wiring, connection, and other operations.

[0086] In some embodiments, the base 40 and the housing 1 of the adjacent battery pack 10 are connected by a first limiting structure. The first limiting structure is configured to restrict the relative movement of the base 40 and the housing 1 of the adjacent battery pack 10 in a direction perpendicular to the second direction Z, so as to ensure that the base 40 and the adjacent battery pack 10 maintain a relatively fixed positional relationship, enhance the structural stability of the entire energy storage system, and avoid safety hazards caused by structural shaking.

[0087] In other embodiments, the power inverter 20 and the housing 1 of the adjacent battery pack 10 are connected by a second limiting structure. The second limiting structure is configured to restrict the relative movement of the power inverter 20 and the housing 1 of the adjacent battery pack 10 in a direction perpendicular to the second direction Z, so as to ensure that the power inverter 20 and the adjacent battery pack 10 maintain a relatively fixed positional relationship, enhance the structural stability of the entire energy storage system, and avoid safety hazards caused by structural shaking.

[0088] Based on this, when the base 40 and the housing 1 of the adjacent battery pack 10 are connected by a first limiting structure, and the power inverter 20 and the housing 1 of the adjacent battery pack 10 are connected by a second limiting structure, the above arrangement can ensure the stability and reliability of the electrical and mechanical connections between the battery pack 10, the base 40 and the power inverter 20, so that the entire energy storage system can operate normally as a whole, and improve the overall performance and reliability of the energy storage system.

[0089] In other words, the first limiting structure may also include a first limiting part 131 and a second limiting part 141. One of the first limiting part 131 and the second limiting part 141 in the first limiting structure is disposed on the base 40, and the other is disposed on the housing 1 of the battery pack 10 adjacent to the base 40. Similarly, the second limiting structure may also include a first limiting part 131 and a second limiting part 141. One of the first limiting part 131 and the second limiting part 141 in the second limiting structure is disposed on the power inverter 20, and the other is disposed on the housing 1 of the battery pack 10 adjacent to the power inverter 20. The first limiting structure and the second limiting structure may adopt the same arrangement as the first limiting part 131 and the second limiting part 141 described above, which will not be repeated here.

[0090] Please refer to Figure 8 and Figure 13 The energy storage system also includes a wall mount 50, which is configured to fix the battery pack 10 to the target wall 200. Specifically, the housing 1 or side panel 18 of the battery pack 10 is fixedly connected to the target wall 200 via the wall mount 50 to achieve wall-mounted installation of the energy storage system, avoiding the energy storage system occupying a large amount of floor space. For example, the housing 1 or side panel 18 of the battery pack 10 adjacent to the power inverter 20 can be fixedly connected to the target wall 200 via the wall mount 50. The first side wall 11 of the housing 1 of the battery pack 10 adjacent to the power inverter 20 faces the target wall 200.

[0091] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0092] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. Furthermore, specific examples have been used in the specification to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application, and the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized in that, include: The housing has a first sidewall and a second sidewall disposed opposite each other in a first direction, the area of ​​the first sidewall and the area of ​​the second sidewall being larger than the area of ​​the remaining sidewalls of the housing; The battery module is housed within the casing; A DC converter module is disposed on the side of the first sidewall facing away from the second sidewall and is electrically connected to the battery module; A first heat dissipation structure is disposed on the side of the DC-DC converter that is opposite to the first sidewall and is in contact with the DC-DC converter. The coverage area of ​​the first heat dissipation structure on the first sidewall is greater than the area of ​​the other sidewalls.

2. The battery pack according to claim 1, characterized in that, The remaining sidewalls include a third sidewall and a fourth sidewall disposed opposite each other in the second direction, the second direction intersecting the first direction, a first limiting part is provided on the third sidewall, and a second limiting part is provided on the fourth sidewall, the orthographic projection of the first limiting part in the second direction and the orthographic projection of the second limiting part in the second direction at least partially coincide.

3. The battery pack according to claim 2, characterized in that, One of the first limiting part and the second limiting part is a limiting protrusion and the other is a limiting groove. The orthographic projection of the limiting protrusion in the second direction is located within the orthographic projection of the limiting groove in the second direction.

4. The battery pack according to claim 2 or 3, characterized in that, The third sidewall is provided with the first limiting part at both edges in the third direction, and the fourth sidewall is provided with the second limiting part at both edges in the third direction; the second limiting part and the first limiting part are provided in a one-to-one correspondence, wherein the third direction, the second direction and the first direction intersect each other.

5. The battery pack according to claim 2, characterized in that, The first limiting part is provided with a first hook hole.

6. The battery pack according to claim 1, characterized in that, At least one of the remaining sidewalls is provided with a reinforcing rib structure.

7. The battery pack according to claim 6, characterized in that, The reinforcing rib structure includes multiple first reinforcing ribs and multiple second reinforcing ribs arranged in an intersecting manner.

8. An energy storage device, characterized in that, The energy storage device includes a plurality of battery packs as described in any one of claims 1 to 7, wherein the plurality of battery packs are stacked along a second direction and adjacent battery packs are connected in series, and the second direction intersects the first direction.

9. The energy storage device according to claim 8, characterized in that, In the two side walls of the housings of two adjacent battery packs that are in contact, one side wall is provided with a first limiting part and the other side wall is provided with a second limiting part; and the first limiting part and the second limiting part on the two side walls that are in contact cooperate to limit the relative displacement of the two in a direction perpendicular to the second direction.

10. The energy storage device according to claim 9, characterized in that, One of the first limiting portion and the second limiting portion is a limiting protrusion, and the other is a limiting groove; the limiting protrusion of one battery pack is inserted into the limiting groove of an adjacent battery pack, and the energy storage device further includes: A connector that securely connects the limiting protrusion and the groove wall of the limiting groove.

11. The energy storage device according to claim 8, characterized in that, The battery pack also includes a side panel, which is arranged around the outer periphery of the DC-DC converter module and its two ends are respectively connected to the first side wall and the first heat dissipation structure. The DC-DC converter module is disposed between the first side wall and the first heat dissipation structure and is in contact with the first heat dissipation structure.

12. The energy storage device according to claim 11, characterized in that, The side panels of two adjacent battery packs are located on the same side of two end faces in the third direction, one end face is provided with a first socket and the other end face is provided with a second socket; the energy storage device also includes a wiring harness connector, one plug of the wiring harness connector is plugged into the first socket and the other plug is plugged into the second socket to connect the two adjacent battery packs in series; the third direction, the second direction and the first direction intersect each other.

13. The energy storage device according to claim 11, characterized in that, On two facing sides of the side panels of two adjacent battery packs, a first connector is provided on one side and a second connector is provided on the other side. The first connector and the second connector are plugged and detached to connect the two adjacent battery packs in series.

14. The energy storage device according to claim 13, characterized in that, One of the sides is provided with an annular boss, which is arranged around the outer periphery of the first connector; the other side is provided with a receiving groove, and the second connector is located in the receiving groove; when the annular boss is inserted into the receiving groove, the first connector and the second connector are plugged in and connected.

15. The energy storage device according to claim 14, characterized in that, A sealing element is provided inside the receiving groove, and the sealing element seals the connection between the annular boss and the groove wall of the receiving groove.

16. An energy storage system, characterized in that, The energy storage system includes the energy storage device as described in any one of claims 8 to 15, and further includes: A power inverter is disposed on one side of the plurality of battery packs in the second direction and is electrically connected to the adjacent battery packs.

17. The energy storage system according to claim 16, characterized in that, The energy storage system also includes: The second heat dissipation structure is disposed on one side of the power inverter in the first direction and is located on the same side as the first heat dissipation structure in the first direction. The second heat dissipation structure is disposed close to the second sidewall relative to the first heat dissipation structure.

18. The energy storage system according to claim 17, characterized in that, The sum of the dimensions of the power inverter and the second heat dissipation structure in the first direction is less than the dimension of the battery pack in the first direction.

19. The energy storage system according to claim 17 or 18, characterized in that, The first heat dissipation structure includes a first heat dissipation plate and a plurality of first heat dissipation parts. The first heat dissipation plate is connected to the first side wall and in contact with the DC-DC converter module, and the plurality of first heat dissipation parts are disposed on the side of the first heat dissipation plate facing away from the first side wall. The second heat dissipation structure includes a second heat dissipation plate and a plurality of second heat dissipation parts. The second heat dissipation plate is connected to the power inverter, and the plurality of second heat dissipation parts are disposed on the side of the second heat dissipation plate facing away from the power inverter. The second heat sink is positioned closer to the second sidewall than the first heat sink.

20. The energy storage system according to claim 19, characterized in that, A first air duct is formed between two adjacent first heat dissipation parts, and a second air duct is formed between two adjacent second heat dissipation parts; wherein the extension direction of the first air duct and the extension direction of the second air duct intersect.

21. The energy storage system according to claim 19, characterized in that, The first heat dissipation part is a first heat dissipation fin, and the second heat dissipation part is a second heat dissipation fin. The extension direction of the first heat dissipation fin intersects the extension direction of the second heat dissipation fin.

22. The energy storage system according to claim 19, characterized in that, At least one of the first heat dissipation part and the second heat dissipation part is a heat dissipation protrusion.

23. The energy storage system according to claim 22, characterized in that, The heat dissipation protrusion is conical; when the first heat dissipation part is a heat dissipation protrusion, the diameter of the heat dissipation protrusion gradually decreases along the direction away from the first heat dissipation plate; when the second heat dissipation part is the heat dissipation protrusion, the diameter of the heat dissipation protrusion gradually decreases along the direction away from the second heat dissipation plate.

24. The energy storage system according to claim 19, characterized in that, The first heat dissipation structure further includes a first heat dissipation fan, which is disposed on the side of the first heat dissipation plate having the first heat dissipation part, and the air outlet side of the first heat dissipation fan is disposed towards the first heat dissipation part. And / or, The second heat dissipation structure further includes a second cooling fan, which is disposed on the side of the second heat dissipation plate having the second heat dissipation part, and the air outlet side of the second cooling fan is disposed facing the second heat dissipation part.

25. The energy storage system according to claim 16, characterized in that, The energy storage system also includes: A base is disposed on the other side of the plurality of battery packs in the second direction and is connected to the housing of the adjacent battery pack.

26. The energy storage system according to claim 25, characterized in that, The energy storage system also includes: A first limiting structure connects the base and the housing of the adjacent battery pack to limit their relative displacement in a direction perpendicular to the second direction. And / or, A second limiting structure connects the housing of the power inverter and the adjacent battery pack to limit their relative displacement in a direction perpendicular to the second direction.

27. The energy storage system according to claim 16 or 25, characterized in that, The energy storage system also includes: A wall mount is configured to securely attach the battery pack to a target wall.

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