Battery device, energy storage device, energy storage system, charging grid and electric equipment

Abstract

The invention relates to the technical field of battery equipment, and discloses a battery device, an energy storage device, an energy storage system, a charging grid and electric equipment. The battery device includes: a plurality of battery cells; the plurality of single batteries are arranged in the box main body, and the opening end of the box main body is provided with two first straight edge parts; the box cover covers the opening end and is provided with two second straight edge parts; the first straight edge part and the second straight edge part are respectively provided with a clamping groove and / or a clamping bulge; or, one of the two first straight edge parts is provided with a clamping groove, the other of the two first straight edge parts is provided with a clamping protrusion, one of the two second straight edge parts is provided with a clamping groove, and the other of the two second straight edge parts is provided with a clamping protrusion; and when the first straight edge part and the second straight edge part are correspondingly connected, the clamping bulge is detachably connected to the clamping groove. By applying the technical scheme, the problems that the box main body and the box cover of the battery device are locked and fixed by adopting a plurality of bolt and nut connecting pairs, the locking time is long, and the overall production efficiency of the battery device is influenced are solved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery equipment, and in particular relates to a battery device, an energy storage device, an energy storage system, a charging grid and an electrical device. Background Art

[0002] In the battery device of the related art, after the peripheral edge areas of the box body and the box cover are butted against each other, a plurality of bolt and nut connection pairs are used to lock and fix them around a circle. However, since a large number of bolt and nut connection pairs are required to lock and fix the box body and the box cover, and the bolt and nut connection pairs need to be locked one by one, the locking process is cumbersome and time-consuming, which affects the overall production efficiency of the battery device. Summary of the invention

[0003] The purpose of the present application is to provide a battery device, an energy storage device, an energy storage system, a charging grid and electrical equipment, including but not limited to solving the problem that a box body and a box cover of a battery device in the related art are locked and fixed using multiple bolt and nut connection pairs, and the locking work is time-consuming, which affects the overall production efficiency of the battery device.

[0004] To achieve the above object, according to a first aspect of an embodiment of the present application, a battery device is provided, comprising: Multiple battery cells; The box body is formed with an assembly space, the assembly space has an open end, a plurality of battery cells are arranged in the assembly space, the open end has two opposite first straight edges, the box body includes a bottom plate and a plurality of side plates, the plurality of side plates are arranged end to end on the bottom plate to form the assembly space, and the two first straight edges are respectively arranged on the two opposite side plates; The box cover is closed at the opening end, the plurality of side plates and the cover plate of the box cover are all single-layer metal plates, the box cover has two second straight edges, and the two second straight edges are connected to the two first straight edges in a one-to-one correspondence; The first straight edge portion is provided with a snap-in groove and / or a snap-in protrusion, and the second straight edge portion is provided with a snap-in groove and / or a snap-in protrusion; or, one of the two first straight edges is provided with a snap-in groove, and the other of the two first straight edges is provided with a snap-in protrusion, and one of the two second straight edges is provided with a snap-in groove, and the other of the two second straight edges is provided with a snap-in protrusion; when the first straight edge portion is correspondingly connected to the second straight edge portion, the snap-in protrusion can be detachably connected to the snap-in groove.

[0005] In the battery device provided in the embodiment of the present application, a plurality of battery cells are assembled in the assembly space of the box body, and then the box cover is closed on the open end of the box body, thereby sealing the assembly space. When the box cover is closed on the open end of the box body, the open end has two opposite first straight sides, and the box cover has two second straight sides corresponding to the two first straight sides. The first straight side is provided with a snap-in groove and / or a snap-in protrusion, and the second straight side is provided with a snap-in groove and / or a snap-in protrusion; or, one of the two first straight sides is provided with a snap-in groove, and the other of the two first straight sides is provided with a snap-in protrusion, and one of the two second straight sides is provided with a snap-in groove, and the other of the two second straight sides is provided with a snap-in protrusion; when the first straight side is connected to the second straight side correspondingly, the snap-in protrusion can be detachably connected to the snap-in groove. In this way, compared with the related art that uses multiple bolt and nut connection pairs around the circumference of the box body and the box cover to lock and fix the box body and the box cover, when assembling the battery device provided by the embodiment of the present application, the assembly structure in which the clamping protrusion and the clamping groove cooperate replaces at least a part of the bolt and nut connection pairs, and the clamping protrusion is clamped into the clamping groove, so that the box cover can be stably covered on the open end of the box body, and there is no need to lock the bolt and nut connection pairs one by one, thereby greatly improving the efficiency of the mutual covering of the box body and the box cover, and also greatly improving the overall production efficiency of the assembly and production of the battery device. In addition, the single-layer metal plate as the thin wall of the assembly space is conducive to reducing the overall weight of the battery device and achieving the purpose of lightweighting.

[0006] In some embodiments of the present application, the battery device further includes a connecting member, the opening end further includes two third straight sides that are opposite and spaced apart, the two third straight sides are connected end to end with the two first straight sides to form the opening end, and the third straight sides are detachably connected to the box cover via the connecting member. The connecting member assists and combines the assembly structure of the clamping protrusion and the clamping groove, so that the box body and the box cover are firmly and stably covered.

[0007] In some embodiments of the present application, the battery device further includes a sealing structure, which is disposed between the box body and the box cover to seal the gap between the open end and the box cover. The sealing structure forms the assembly space into a completely sealed space, thereby achieving dustproof and waterproof effects.

[0008] In some embodiments of the present application, the sealing structure includes a sealing ring, which is elastically deformable, arranged along the periphery of the opening end, and clamped between the opening end and the box cover. In addition, the connecting member is located on the side of the sealing ring away from the assembly space or the connecting member passes through the sealing ring. The sealing ring forms a sealing arrangement for the gap between the opening end and the box cover to achieve dustproof and waterproof effects.

[0009] In some embodiments of the present application, the connecting member is a bolt-nut connection pair.

[0010] In some embodiments of the present application, the sealing structure further includes an adhesive layer, and the sealing ring is bonded and fixed to the end surface of the opening end by the adhesive layer, so as to prevent the relative position displacement of the sealing ring relative to the box body when the box cover is closed on the opening end of the box body.

[0011] In some embodiments of the present application, the sealing ring is located on the side of the clamping groove facing the assembly space. The sealing ring completely isolates the through holes from the assembly space, thereby achieving complete sealing between the box body and the box cover.

[0012] In some embodiments of the present application, at least one end of the clamping groove is provided with an entry for inserting the end of the clamping protrusion, and the extension directions of any two clamping grooves are parallel to each other. The clamping protrusion is assembled into the clamping groove by sliding along the extension direction of the clamping groove, which not only simplifies and speeds up the assembly method, but also improves the assembly efficiency.

[0013] In some embodiments of the present application, both ends of the snap-in slot are provided with entry openings.

[0014] In some embodiments of the present application, the extension directions of the two first straight edge portions are parallel to each other, and the extension direction of the snap-fit ​​groove and / or the snap-fit ​​protrusion is consistent with the extension direction of the first straight edge portion.

[0015] In some embodiments of the present application, the sealing ring is located on a side of the clamping groove away from the assembly space, and the sealing ring forms a sealing arrangement for the gap between the opening end and the box cover to achieve dustproof and waterproof effects.

[0016] In some embodiments of the present application, the clamping protrusion includes a body and a wing protrusion disposed on at least one side of the body, the clamping groove includes a first groove space and a second groove space, the first groove space is connected to the second groove space, the body is accommodated in the first groove space, and the wing protrusion is accommodated and clamped in the second groove space. The wing protrusion cooperates with the second groove space to prevent the clamping protrusion from escaping from the clamping groove, so that the box body and the box cover are firmly and stably covered.

[0017] In some embodiments of the present application, at least one wing protrusion is respectively provided on both sides of the body, and the plurality of wing protrusions are symmetrically arranged relative to the body, and at least one second groove space is respectively provided on the groove walls on both sides of the first groove space, and the plurality of wing protrusions are arranged in one-to-one correspondence with the plurality of second groove spaces. When the box body and the box cover are subjected to the expansion force generated by the battery cell, the wing protrusions arranged on both sides of the body in each clamping protrusion can simultaneously withstand the expansion force, thereby further improving the firmness and stability of the cover between the box body and the box cover.

[0018] In some embodiments of the present application, the wing protrusion is provided with a guiding inclined surface for guiding the clamping protrusion to insert into the clamping groove. Due to the guiding and sliding action of the guiding inclined surface, the clamping protrusion can be smoothly inserted into the clamping groove.

[0019] According to a second aspect of an embodiment of the present application, an energy storage device is provided, wherein the energy storage device comprises a battery device as described above, and the battery device is used to store or provide electrical energy.

[0020] According to a third aspect of an embodiment of the present application, an electric device is provided. The electric device includes the battery device as described above; or, the electric device includes the energy storage device as described above; or, the electric device includes the energy storage system as described above. The battery device is used to store or provide electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic front view of a battery device according to an embodiment of the present application; Figure 2 for Figure 1 A schematic top view of a battery device is shown; Figure 3 for Figure 2 Schematic cross-sectional view along the AA direction; Figure 4 for Figure 3 The enlarged schematic diagram of point B in the middle; Figure 5 for Figure 1 Schematic diagram of the battery device shown Figure 1 ; Figure 6 for Figure 1 Schematic diagram of the battery device shown Figure 2 , wherein the bare battery cell is disassembled and removed; Figure 7 for Figure 6 The enlarged schematic diagram of the center C; Figure 8 for Figure 6 The enlarged schematic diagram of point D in the middle; Fig. 9 It is an exploded schematic diagram of another battery device according to an embodiment of the present application; Fig.10 for Fig. 9 The enlarged schematic diagram of point E in the middle; Fig.11 A schematic diagram of the assembly structure of a clamping protrusion and a clamping groove of another battery device according to an embodiment of the present application; Fig.12A schematic diagram of the assembly structure of an energy storage device according to an embodiment of the present application; Fig.13 This is a schematic diagram of the assembly structure of an electrical equipment according to an embodiment of the present application.

[0023] Among them, the reference numerals in the figures are: 100. Battery device; 10. Battery cells; 20. Box body; 21. Assembly space; 22. Open end; 221. First straight edge; 222. Third straight edge; 23. Side plate; 24. Bottom plate; 30. box cover; 31. second straight edge; 32. cover plate; 40. Sealing structure; 41. Sealing ring; 42. Adhesive layer; 51, snap-fit ​​groove; 511, first groove space; 512, second groove space; 52, snap-fit ​​protrusion; 521, body; 522, wing protrusion; 523, guide slope; 60. Connecting member; 61. Bolt; 62. Nut; 200, energy storage device; 201, cabinet; 300. Electrical equipment; 310. Electrical load; 320. Control device; 330. Vehicle frame; 340. Wheels. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0025] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] At present, judging from the development of the market situation, the application of battery devices is becoming more and more extensive. Battery devices are not only used in power systems such as hydropower, thermal power, wind power and solar power stations (battery devices for such applications are generally referred to as energy storage batteries), but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields (battery devices for such applications are generally referred to as power batteries). With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding. Therefore, the expansion of market demand also requires continuous improvement of production capacity, among which improving production efficiency is one of the quantitative indicators for improving production capacity.

[0029] The battery device includes a box body, a box cover and a plurality of battery cells. The box body and the box cover are covered with each other to form an assembly space, and the plurality of battery cells are assembled in the assembly space. In the related art, when the box body and the box cover are covered with each other, the circumferential edge areas of the box body and the box cover are butted against each other and then a plurality of bolt and nut connection pairs are used to lock and fix them in a circle. Since a large number of bolt and nut connection pairs are required to lock and fix the box body and the box cover, and the bolt and nut connection pairs need to be locked one by one, the locking work is not only cumbersome and time-consuming, but also affects the overall production efficiency of the battery device.

[0030] Based on the above considerations, an embodiment of the present application provides a battery device. Among them, a plurality of battery cells are assembled in the assembly space of the box body. As one of the core components of the battery device, the battery cell has energy storage function and discharge output function. When the box body and the box cover are covered with each other, the box body and the box cover are locked with each other through the snap-in protrusion and the snap-in groove, and a plurality of bolt and nut connection pairs are used to lock the box body and the box cover, so that the box body and the box cover complete the covering operation. Specifically, the opening end of the box body has two opposite first straight sides, and the box cover has a second straight side. One of the first straight side and the second straight side is provided with a snap-in protrusion, and the other of the two is provided with a snap-in groove, and the snap-in protrusion is connected to the snap-in groove. Compared with the related art that uses multiple bolt and nut connection pairs to lock and fix the box body and the box cover around the circumference of the box body and the box cover, when assembling the battery device provided by the embodiment of the present application, the assembly structure in which the snap-in protrusion and the snap-in groove cooperate replaces at least a part of the bolt and nut connection pairs. The snap-in protrusion is snapped into the snap-in groove, so that the box cover can be stably covered on the open end of the box body, and there is no need to lock the bolt and nut connection pairs one by one, thereby greatly improving the efficiency of covering the box body and the box cover with each other, and thus greatly improving the overall production efficiency of assembling and producing battery devices.

[0031] In order to illustrate the technical solution provided by the present application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0032] According to a first aspect of an embodiment of the present application, an embodiment of the present application provides a battery device 100. Figures 1 to 9 As shown, the battery device 100 includes a box body 20, a box cover 30 and a plurality of battery cells 10. The box body 20 is formed with an assembly space 21, the assembly space 21 has an open end 22, and the plurality of battery cells 10 are arranged in the assembly space 21, and the open end 22 has two opposite first straight edges 221. The box cover 30 covers the open end 22, and the box cover 30 has two second straight edges 31, and the two second straight edges 31 are connected to the two first straight edges 221 in a one-to-one correspondence. In which: the first straight edge portion 221 is provided with a snap-in groove 51 and / or a snap-in protrusion 52, and the second straight edge portion 31 is provided with a snap-in groove 51 and / or a snap-in protrusion 52; or, one of the two first straight edges 221 is provided with a snap-in groove 51, and the other of the two first straight edges 221 is provided with a snap-in protrusion 52, and one of the two second straight edges 31 is provided with a snap-in groove 51, and the other of the two second straight edges 31 is provided with a snap-in protrusion 52; when the first straight edge portion 221 is correspondingly connected to the second straight edge portion 31, the snap-in protrusion 52 can be detachably connected to the snap-in groove 51.

[0033] In the battery device 100 provided in the embodiment of the present application, a plurality of battery cells 10 are assembled in the assembly space 21 of the box body 20, and then the box cover 30 is covered on the open end 22 of the box body 20, thereby sealing the assembly space 21. When the box cover 30 is covered on the open end 22 of the box body 20, the open end 22 has two opposite first straight sides 221, and the box cover 30 has two second straight sides 31 corresponding to the two first straight sides 221. The first straight edge portion 221 is provided with a snap-in groove 51 and / or a snap-in protrusion 52, and the second straight edge portion 31 is provided with a snap-in groove 51 and / or a snap-in protrusion 52; or, one of the two first straight edges 221 is provided with a snap-in groove 51, and the other of the two first straight edges 221 is provided with a snap-in protrusion 52, and one of the two second straight edges 31 is provided with a snap-in groove 51, and the other of the two second straight edges 31 is provided with a snap-in protrusion 52; when the first straight edge portion 221 is correspondingly connected to the second straight edge portion 31, the snap-in protrusion 52 can be detachably connected to the snap-in groove 51. In this way, compared with the related art that uses multiple bolt and nut connection pairs to lock and fix the box body 20 and the box cover 30 around the circumference of the box body 20 and the box cover 30, when assembling the battery device 100 provided in the embodiment of the present application, the assembly structure in which the snap-in protrusion 52 and the snap-in groove 51 cooperate replaces at least a part of the bolt and nut connection pairs, and the snap-in protrusion 52 is snapped into the snap-in groove 51, so that the box cover 30 can be stably covered on the open end 22 of the box body 20, and there is no need to lock the bolt and nut connection pairs one by one, thereby greatly improving the efficiency of covering the box body 20 and the box cover 30 with each other, and thus greatly improving the overall production efficiency of assembling and producing the battery device 100.

[0034] In some embodiments of the present application, Figures 1 to 7 , Fig. 9 and Fig.10 As shown, the box body 20 includes a bottom plate 24 and a plurality of side plates 23, and the plurality of side plates 23 are arranged end to end on the bottom plate 24 to form an assembly space 21, and two first straight edges 221 are respectively arranged at one end of two opposite side plates 23 away from the bottom plate 24, wherein the plurality of side plates 23 and the cover plate 32 of the box cover 30 are single-layer metal plates. In this embodiment, there are four side plates 23, and the four side plates 23 are arranged end to end on the bottom plate 24 to form a rectangular assembly space 21, wherein the first straight edges 221 are arranged at one end of two opposite side plates 23 away from the bottom plate 24. The single-layer metal plate includes but is not limited to a thin-walled steel plate, a thin-walled aluminum alloy plate, etc. On the basis of ensuring that the mechanical strength requirements of the box body 20 and the box cover 30 are met, the single-layer metal plate is used as the thin wall of the assembly space 21, which is conducive to reducing the overall weight of the battery device 100 and achieving the purpose of lightweighting.

[0035] In the battery device 100, a plurality of battery cells 10 are distributed in an array in an assembly space 21, such as Figure 5As shown, the multiple battery cells 10 distributed in the array are arranged closely and orderly, which can maximize the effective space of the assembly space 21, improve the effective utilization rate of the assembly space 21, and then improve the energy density of the battery device 100. The battery cells 10 are used to store electrical energy or supply power.

[0036] In the battery device 100 provided in the embodiment of the present application, a structure in which a snap-in groove 51 is provided on the first straight side 221 and a snap-in protrusion 52 corresponding to the snap-in groove 51 is provided on the second straight side 31 is preferably adopted. In this way, the snap-in groove 51 of the first straight side 221 located at the opening end 22 of the box body 20 can be machined by a CNC machine tool (Computer numerical control machine tools), and of course, it can also be made by a mold casting process. In addition, the box cover 30 is integrally formed by a mold casting process, so as to obtain the snap-in protrusion 52 located on the second straight side 31 of the box cover 30.

[0037] In order to make the box body 20 and the box cover 30 cover firmly and stably, Figure 1 , Figure 2 , Figure 6 and Fig. 9 As shown, in some embodiments of the present application, the battery device 100 further includes a connecting member 60, which is used to further connect the box body 20 and the box cover 30. The connecting member 60 assists and combines the assembly structure of the clamping protrusion 52 and the clamping groove 51, so that the box body 20 and the box cover 30 are firmly and stably covered. Among them, the opening end 22 also has two third straight sides 222 that are opposite and spaced apart. The two third straight sides 222 are located between the two first straight sides 221, and the third straight sides 222 and the box cover 30 are detachably connected through the connecting member 60.

[0038] In some embodiments of the present application, Figure 6 and Fig. 9As shown, the connecting member 60 includes but is not limited to a bolt-nut connection pair formed by screwing the bolt 61 and the nut 62 together. The bolt-nut connection pair is used to lock the corresponding position of the third straight edge 222 of the box body 20 and the box cover 30, so that the box body 20 and the box cover 30 are firmly and stably covered. In addition, during the later use of the battery device 100, if it is necessary to repair and replace the parts inside the battery device 100, the nut 62 can be directly unscrewed, and the clamping protrusion 52 and the clamping groove 51 can be separated, so that the box cover 30 can be opened from the opening end 22 of the box body 20, and then the parts inside the battery device 100 can be repaired and replaced. After the parts inside the battery device 100 are repaired and replaced, the clamping protrusion 52 and the clamping groove 51 are clamped, and then the bolt-nut connection pair is re-locked to the corresponding position of the third straight edge 222 of the box body 20 and the box cover 30, and the box body 20 and the box cover 30 can be firmly and stably locked again.

[0039] Of course, in other embodiments of the present application, the connecting member 60 can also be a rivet member, and the box body 20 and the box cover 30 are further connected by riveting. At this time, the box body 20 and the box cover 30 are not detachable. During the later use of the battery device 100, if it is necessary to repair or replace the parts inside the battery device 100, the rivet member must be destroyed to separate the box body 20 from the box cover 30. After the parts inside the battery device 100 are repaired and replaced, the clamping protrusion 52 is clamped with the clamping groove 51, and then the box body 20 and the box cover 30 are connected by a new rivet member. In this way, the box body 20 and the box cover 30 are firmly and stably covered.

[0040] like Figure 4 , Figure 6 and Fig. 9 As shown, in some embodiments of the present application, the battery device 100 further includes a sealing structure 40, which is disposed between the box body 20 and the box cover 30 to seal the gap between the opening end 22 and the box cover 30. That is, the assembly space 21 is formed into a completely sealed space by the sealing structure 40, thereby achieving dustproof and waterproof effects, preventing dust and water vapor from entering the assembly space 21 to pollute and corrode the battery cell 10, preventing the occurrence of an internal short circuit in the battery device 100, and ensuring the normal operation of the battery device 100.

[0041] In some embodiments of the present application, Figure 1 , Figure 4 , Figure 6 and Fig. 9As shown, the sealing structure 40 includes a sealing ring 41, which is elastically deformable and arranged along the periphery of the opening end 22. When the box cover 30 covers the opening end 22 of the box body 20, the sealing ring 41 is placed on the end surface of the opening end 22, and then the clamping protrusion 52 is clamped with the clamping groove 51, and the box body 20 and the box cover 30 are locked by the connecting member 60, so that the sealing ring 41 is clamped between the opening end 22 and the box cover 30. In this way, the sealing ring 41 is elastically deformed by the squeezing action of the box body 20 and the box cover 30, so as to form a sealing setting for the gap between the opening end 22 and the box cover 30, achieve dustproof and waterproof effects, prevent dust and water vapor from entering the assembly space 21 to pollute and erode the battery cell 10, prevent the internal short circuit of the battery device 100, and ensure the normal operation of the battery device 100.

[0042] When the box cover 30 is closed on the open end 22 of the box body 20, in order to prevent the sealing ring 41 from being displaced relative to the box body 20, in some embodiments of the present application, such as Figure 4 , Figure 6 and Fig. 9 As shown, the sealing structure 40 also includes an adhesive layer 42, and the sealing ring 41 is bonded and fixed to the end surface of the opening end 22 through the adhesive layer 42. In this way, the relative position between the sealing ring 41 and the box body 20 is fixed. When the box cover 30 is covered on the opening end 22 of the box body 20, even if the box cover 30 is moved and adjusted on the opening end 22 (i.e., the relative position between the box cover 30 and the box body 20 is adjusted so that the box cover 30 accurately covers the opening end 22 of the box body 20), the relative position of the sealing ring 41 relative to the box body 20 will not be offset, ensuring that the gap between the opening end 22 and the box cover 30 forms a sealing setting, achieving dustproof and waterproof effects, preventing dust and water vapor from entering the assembly space 21 to cause pollution and erosion to the battery cell 10, preventing the occurrence of internal short circuit of the battery device 100, and further ensuring the normal operation of the battery device 100.

[0043] In some embodiments of the present application, the sealing structure 40 can be a circle of sealing adhesive layer formed by the coated structural adhesive after curing. That is, when the box cover 30 is covered on the open end 22 of the box body 20, a circle of structural adhesive is now coated on the open end 22 of the box body 20 (the structural adhesive at this time is in a thick paste state), and then the box cover 30 is covered on the open end 22, and the third straight edge 222 of the box body 20 and the corresponding position of the box cover 30 are clamped by the clamping protrusion 52 and the clamping groove 51, and the third straight edge 222 of the box body 20 is connected and locked by a plurality of bolts and nuts, so that the box body 20 and the box cover 30 clamp the structural adhesive. In this way, after the structural adhesive is completely cured, a circle of sealing adhesive layer (i.e., the sealing structure 40) can be formed, thereby forming a sealing setting for the gap between the open end 22 and the box cover 30, achieving dustproof and waterproof effects, preventing dust and water vapor from entering the assembly space 21 to pollute and erode the battery cell 10, preventing the occurrence of internal short circuit of the battery device 100, and ensuring the normal operation of the battery device 100.

[0044] In the battery device 100, in order to smoothly install the connecting member 60, it is necessary to open corresponding through holes in the box body 20 and the box cover 30, pass the bolt 61 through the through holes of the box body 20 and the box cover 30, and then screw and lock the nut 62 on the bolt 61, so as to lock and fix the box body 20 and the box cover 30. Considering the sealing performance between the box body 20 and the box cover 30, in some embodiments of the present application, the connecting member 60 is located on the side of the sealing ring 41 away from the assembly space 21, that is, the through holes of the box body 20 and the box cover 30 are both located beside the outer ring of the sealing ring 41, that is, the through holes of the box body 20 and the box cover 30 are both located on the side of the sealing ring 41 away from the assembly space 21, so that these through holes are completely isolated from the assembly space 21 by the sealing ring 41, thereby achieving complete sealing between the box body 20 and the box cover 30. Alternatively, in other embodiments of the present application, such as Figure 1 , Figure 6 and Fig. 9 The connecting member 60 passes through the sealing ring 41, and the sealing ring 41 forms a circumferential sealing arrangement for the through holes of the box body 20 and the box cover 30. The through holes and the assembly space 21 are isolated from each other, and water vapor cannot enter the assembly space 21 through the through holes, thereby achieving dustproof and waterproof effects.

[0045] like Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments of the present application, the sealing ring 41 is entirely located between the two clamping grooves 51. In other words, the two clamping grooves 51 are both located on the side of the sealing ring 41 away from the assembly space 21, that is, the sealing ring 41 is located on the side of the clamping groove 51 facing the assembly space 21. In this way, the two clamping grooves 51 are completely isolated from the assembly space 21 by the sealing ring 41, so that the box body 20 and the box cover 30 are completely sealed.

[0046] like Figure 6 and Figure 8 As shown, in some embodiments of the present application, at least one end of the clamping groove 51 is provided with an entrance for inserting the end of the clamping protrusion 52, and the extension directions of any two clamping grooves 51 are parallel to each other. In this embodiment, when the box cover 30 is covered on the open end 22 of the box body 20, one end of the clamping protrusion 52 is aligned with the entrance of the clamping groove 51, and then the box cover 30 is pushed along the extension direction of the clamping groove 51, so that the clamping protrusion 52 slides into the clamping groove 51 until the box cover 30 completely covers the opening of the open end 22 of the box body 20. During the sliding movement of the box cover 30 relative to the box body 20, the box cover 30 contacts the sealing ring 41. Since the sealing ring 41 is bonded and fixed to the opening end 22 by the adhesive layer 42, that is, the relative position between the sealing ring 41 and the box body 20 is fixed, the sealing ring 41 will not be driven by the box cover 30 and will not shift relative to the box body 20, ensuring that the gap between the opening end 22 and the box cover 30 forms a sealing setting to achieve dustproof and waterproof effects. In addition, compared with the connection method of the bolt and nut connection pair, the clamping protrusion 52 is assembled into the clamping groove 51 by sliding along the extension direction of the clamping groove 51. Not only is the assembly method simple and fast, and the assembly efficiency is improved, but also the relative position between the box cover 30 and the box body 20 is easy to adjust, ensuring that the box cover 30 and the box body 20 cover each other accurately.

[0047] In some embodiments of the present application, the extension directions of the two first straight sides 221 are parallel to each other. In the battery device 100, each first straight side 221 is provided with a snap-in groove 51, and the extension direction of the snap-in groove 51 is consistent with the extension direction of the first straight side 221; or, each first straight side 221 is provided with a snap-in protrusion 52, and the extension direction of the snap-in protrusion 52 is consistent with the extension direction of the first straight side 221. In this way, the setting position of the snap-in groove 51 on the first straight side 221 is reasonably arranged, which not only ensures the mechanical strength of the first straight side 221 after the snap-in groove 51 is provided, but also reduces the material usage of the first straight side 221. This helps to reduce the overall weight of the box body 20, and correspondingly reduces the overall weight of the battery device 100, so that the battery device 100 achieves a lightweight optimization effect.

[0048] In the battery device 100 of some embodiments of the present application, both ends of the clamping groove 51 are provided with an entry port. That is, the clamping groove 51 does not need to be assisted by a foolproof structure, and any end of the two ends of the clamping groove 51 can be used as an entry port for the end of the clamping protrusion 52 to align and slide in, further improving the assembly efficiency of the box cover 30 covering the box body 20.

[0049] like Fig. 9As shown, in other embodiments of the present application, the sealing ring 41 surrounds the two clamping grooves 51. In other words, the sealing ring 41 is located on the side of the clamping groove 51 away from the assembly space 21. In this embodiment, the clamping protrusion 52 is inserted into the clamping groove 51 to form a clamping assembly, that is, the clamping protrusion 52 is inserted into the clamping groove 51 along the arrangement direction from the box cover 30 to the box body 20. When the sealing ring 41 surrounds the two clamping grooves 51, the sealing ring 41 will interfere with the sliding of the clamping protrusion 52 along the extension direction of the clamping groove 51. Therefore, in this embodiment, the clamping protrusion 52 is inserted into the clamping groove 51 along the arrangement direction from the box cover 30 to the box body 20, so that the clamping protrusion 52 and the clamping groove 51 are clamped. The sealing ring 41 forms a sealing arrangement for the gap between the open end 22 and the box cover 30 to achieve dustproof and waterproof effects. In addition, the sealing ring 41 is bonded and fixed to the open end 22 by the adhesive layer 42. Since the snap-fit ​​protrusion 52 is inserted into the snap-fit ​​groove 51 along the arrangement direction from the box cover 30 to the box body 20, the box body 20 and the box cover 30 clamp the sealing ring 41. Therefore, after the snap-fit ​​protrusion 52 is inserted into the snap-fit ​​groove 51, the box cover 30 no longer needs to be slid to adjust its relative position relative to the box body 20, thereby reducing the possibility of the box cover 30 driving the sealing ring 41 to shift relative to the box body 20, reducing the adjustment frequency, and thus improving the assembly efficiency.

[0050] In some embodiments of the present application, Figure 7 , Fig.10 and Fig.11 As shown, the clamping protrusion 52 includes a body 521 and at least one wing protrusion 522, and at least one side of the body 521 is provided with a wing protrusion 522. Figure 8 and Fig.11 As shown, the clamping slot 51 includes a first slot space 511 and at least one second slot space 512. The second slot space 512 is provided on at least one side of the slot wall of the first slot space 511. The first slot space 511 is connected to the second slot space 512. The second slot space 512 is provided corresponding to the wing protrusion 522. Figure 4 , Figure 7 , Figure 8 and Fig.11 As shown, the main body 521 is accommodated in the first groove space 511, and the wing protrusion 522 is snapped into the second groove space 512, that is, the wing protrusion 522 cooperates with the second groove space 512, and along the horizontal direction perpendicular to the extension direction of the snap-in groove 51, the first groove space 511 is narrower than the second groove space 512 to prevent the snap-in protrusion 52 from escaping from the snap-in groove 51 along the vertical direction perpendicular to the extension direction of the snap-in groove 51, so that the box body 20 and the box cover 30 are firmly and stably covered.

[0051] In order to further improve the firmness and stability of the cover between the box body 20 and the box cover 30, in some embodiments of the present application, the clamping protrusion 52 includes a plurality of wing protrusions 522, at least one wing protrusion 522 is respectively provided on both sides of the body 521, and the clamping groove 51 includes a plurality of second groove spaces 512, at least one second groove space 512 is respectively provided on the groove walls on both sides of the first groove space 511, and the plurality of wing protrusions 522 are arranged in a one-to-one correspondence with the plurality of second groove spaces 512. When the clamping protrusion 52 is assembled into the clamping groove 51 to form a clamping assembly, for each clamping protrusion 52, both sides of the body 521 have wing protrusions 522 and corresponding second groove spaces 512 to form a clamping restriction effect. When the box body 20 and the box cover 30 are subjected to the expansion force generated by the battery cell 10, the wing protrusions 522 arranged on both sides of the body 521 in each clamping protrusion 52 can simultaneously withstand the expansion force, thereby further improving the firmness and stability of the cover between the box body 20 and the box cover 30.

[0052] like Figure 4 , Figure 7 , Fig.10 and Fig.11 As shown, in some embodiments of the present application, a plurality of wing protrusions 522 are symmetrically arranged relative to the body 521. This makes the overall structure of the clamping protrusion 52 tend to be simplified. When a mold is used to manufacture the box cover 30, the cavity structure corresponding to the clamping protrusion 52 on the mold is relatively simple, thereby reducing the difficulty of mold design and helping to reduce the mold cost. In addition, the plurality of wing protrusions 522 symmetrically arranged relative to the body 521 cooperate with the corresponding second groove space 512. When the box body 20 and the box cover 30 are subjected to the expansion force generated by the battery cell 10, the wing protrusions 522 symmetrically arranged on both sides of the body 521 in each clamping protrusion 52 can disperse and evenly withstand the expansion force, so that the box body 20 and the box cover 30 are firmly and stably covered.

[0053] In some embodiments of the present application, Fig.10 and Fig.11As shown, the wing protrusion 522 is provided with a guiding inclined surface 523, and when the clamping protrusion 52 is inserted into the clamping groove 51, the notch edge of the clamping groove 51 abuts against the guiding inclined surface 523 and slides along the guiding inclined surface 523. In this embodiment, the sealing ring 41 surrounds the two clamping grooves 51, and in the process of inserting the clamping protrusion 52 into the clamping groove 51, the notch of the clamping groove 51 is elastically deformed due to the abutment of the guiding inclined surface 523, so that the notch of the clamping groove 51 is elastically expanded to allow the wing protrusion 522 to be inserted into the clamping groove 51 and matched with the second groove space 512, and due to the guiding and sliding action of the guiding inclined surface 523, the clamping protrusion 52 can be smoothly inserted into the clamping groove 51. When the guiding slope 523 passes over the slot edge of the engaging slot 51 and the wing protrusion 522 is matched with the second slot space 512 , the slot of the engaging slot 51 recovers and shrinks under its own elastic force, thereby restricting the engaging protrusion 52 in the engaging slot 51 .

[0054] According to the second aspect of the embodiments of the present application, the embodiments of the present application further provide an energy storage device 200. In some embodiments of the present application, the energy storage device 200 includes the aforementioned battery device 100, that is, the energy storage device 200 uses one battery device 100 or multiple battery devices 100 connected in series, in parallel, or in mixed connection, and these battery devices 100 are used to store electrical energy or provide electrical energy.

[0055] The energy storage device 200 can be a small portable device, such as a portable energy storage battery used for outdoor travel and camping, or a portable energy storage battery used by street vendors. The energy storage device 200 can also be a large, fixed, high-power industrial-grade device, such as a large energy storage power station used by a power station, wherein the energy storage device 200 can be used for energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems, etc. The energy storage device 200 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 200 can store electrical energy when electricity consumption is low, and provide electrical energy to related users or electrical equipment during peak electricity consumption. Another example is an independent power supply energy storage cabinet or energy storage container used on a construction site or in a factory, or a larger, movable energy storage cabinet or energy storage container used at a large event site.

[0056] like Fig.12 As shown, the energy storage device 200 provided in the embodiment of the present application is preferably an energy storage cabinet, which includes a cabinet body 201 and a plurality of battery devices 100 , and the plurality of battery devices 100 are stacked and assembled in the cabinet body 201 .

[0057] In some embodiments of the present application, the energy storage device 200 may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0058] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the battery cells 10 to each battery cell 10 or each battery device 100 through a pipeline.

[0059] As an example, the main control module can be used as a battery management unit of multiple battery devices 100 to monitor and manage multiple battery devices 100. The main control module can monitor information such as current, voltage, power or temperature of multiple battery devices 100. For example, the charging and discharging current, voltage, etc. of multiple battery devices 100 can be controlled. The main control module includes a slave battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch and other modules.

[0060] As an example, the master control module can be used as a battery management unit of the energy storage device 200 to monitor and manage the energy storage device 200. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device 200. For example, the charging and discharging current and voltage of the energy storage device 200 can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module.

[0061] As an example, the fire protection module includes a control panel, a detector, an alarm device, etc., which are used to detect, alarm or extinguish fire in the energy storage system.

[0062] As an example, the power distribution module may be used to distribute power to modules in the energy storage device 200 that require power.

[0063] According to the third aspect of the embodiments of the present application, the embodiments of the present application further provide an energy storage system. In some embodiments of the present application, the energy storage system includes a power conversion device and an energy storage device 200 as described above, the power conversion device is used to be connected between the power generation equipment and the energy storage device 200, and the battery device 100 in the energy storage device 200 is used to store electrical energy or provide electrical energy.

[0064] In addition, the energy storage system may include one or more power converter systems (PCS). The power generation equipment is used to generate electric energy, and the electric energy generated by the power generation equipment can be stored in the battery device 100 of the energy storage device through the power conversion device. As an example, the power generation equipment may specifically be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, a wind power generation equipment, etc. The specific type of the power generation equipment is not limited in this application.

[0065] According to a fourth aspect of an embodiment of the present application, an embodiment of the present application further provides a charging grid, including a charging pile.

[0066] In some embodiments of the present application, the charging grid also includes an energy storage system as described above, the charging pile is electrically connected to the energy storage system, and the battery device 100 of the energy storage device 200 of the energy storage system is used to store electrical energy or to provide electrical energy to the charging pile.

[0067] Alternatively, in some other embodiments of the present application, the charging grid further includes the aforementioned energy storage device 200, the charging pile is electrically connected to the energy storage device 200, and the battery device 100 of the energy storage device 200 is used to store electrical energy or to provide electrical energy for the charging pile.

[0068] Among them, the charging pile can have one or more connectors, and the connector is used to connect to the charging interface of the device to be charged (such as an electric vehicle), so that energy can be replenished to the energy storage unit of the device to be charged (such as a battery of the electric vehicle).

[0069] According to a fifth aspect of the embodiments of the present application, the embodiments of the present application further provide an electrical device 300 , which includes an electrical load 310 .

[0070] The electric equipment 300 includes but is not limited to electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, the electric toys may include but are not limited to fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. The spacecraft may include but is not limited to airplanes, rockets, space shuttles, and spacecraft, etc.

[0071] In some embodiments of the present application, the electrical equipment 300 also includes an energy storage system as described above, the electrical load 310 is electrically connected to the energy storage system, and the battery device 100 of the energy storage device 200 of the energy storage system is used to store electrical energy, or to provide electrical energy to the electrical load 310, so that the electrical load 310 operates normally.

[0072] Alternatively, in some other embodiments of the present application, the electrical equipment 300 further includes the aforementioned energy storage device 200, that is, the electrical equipment 300 uses one energy storage device 200 or multiple energy storage devices 200 in series, parallel or mixed connection, and the electrical load 310 is electrically connected to the energy storage device 200. The battery device 100 of the energy storage device 200 is used to store electrical energy, or to provide electrical energy to the electrical load 310, so that the electrical load 310 operates normally.

[0073] Alternatively, in some other embodiments of the present application, the electrical device 300 further includes the aforementioned battery device 100, that is, the electrical device 300 uses one battery device 100 or multiple battery devices 100 connected in series, in parallel, or in mixed connection, and the electrical load 310 is electrically connected to the battery device 100. The battery device 100 is used to store electrical energy or to provide electrical energy to the electrical load 310, so that the electrical load 310 operates normally.

[0074] The electric device 300 is an electric car, and is assembled with the battery device 100. Fig.13 As shown, the battery device 100 is installed on the frame 330 of the electric vehicle. The electric vehicle includes a frame 330, a drive motor and a wheel 340. The battery device 100 and the drive motor are fixedly installed on the frame 330, and the wheel 340 is rotatably connected to the frame 330. In addition, the battery device 100 is electrically connected to the drive motor, and the drive motor is drivingly connected to the wheel 340. When the battery device 100 provided in the present application is used as a drive motor (the power supply drive motor is one of the power loads 310 of the power-consuming device 300), the drive motor drives the wheel 340 to rotate, so that the electric vehicle can travel normally. In addition, the electric vehicle includes a control device 320, which is installed on the frame 330, and the control device 320 is electrically connected to the battery device 100. The control device 320 is used to control and monitor the charging and discharging working state of the battery device 100. In some electric vehicles, the battery box of the battery device 100 can be used as a part of the chassis structure of the electric vehicle. For example, part of the battery box may become at least a part of the floor of the electric vehicle, or part of the battery box may become at least a part of the cross beam and the longitudinal beam of the electric vehicle.

[0075] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Multiple battery cells; A box body is formed with an assembly space, the assembly space has an open end, a plurality of battery cells are arranged in the assembly space, the open end has two opposite first straight edges, the box body includes a bottom plate and a plurality of side plates, the plurality of side plates are arranged end to end on the bottom plate to form the assembly space, and the two first straight edges are respectively arranged on the two opposite side plates; A box cover, covering the open end, the plurality of side plates and the cover plate of the box cover are all single-layer metal plates, the box cover has two second straight edges, and the two second straight edges are connected to the two first straight edges in a one-to-one correspondence; The first straight edge portion is provided with a snap-in groove and / or a snap-in protrusion, and the second straight edge portion is provided with a snap-in groove and / or a snap-in protrusion; or, one of the two first straight edge portions is provided with a snap-in groove, and the other of the two first straight edge portions is provided with a snap-in protrusion, and one of the two second straight edge portions is provided with a snap-in groove, and the other of the two second straight edge portions is provided with a snap-in protrusion; when the first straight edge portion is correspondingly connected to the second straight edge portion, the snap-in protrusion can be detachably connected to the snap-in groove.

2. The battery device according to claim 1, characterized in that: The battery device also includes a connecting member, and the open end also has two third straight sides that are opposite and spaced apart. The two third straight sides are connected end to end with the two first straight sides to form the open end, and the third straight sides are detachably connected to the box cover via the connecting member.

3. The battery device according to claim 2, characterized in that: The battery device further includes a sealing structure, which is disposed between the box body and the box cover to seal a gap between the open end and the box cover.

4. The battery device according to claim 3, characterized in that: The sealing structure comprises a sealing ring, which is elastically deformable and arranged along the periphery of the opening end, and is clamped between the opening end and the box cover.

5. The battery device according to claim 4, characterized in that: The connecting member is located at a side of the sealing ring away from the assembly space or the connecting member passes through the sealing ring.

6. The battery device according to claim 5, characterized in that: The connecting member is a bolt and nut connection pair.

7. The battery device according to claim 4, characterized in that: The sealing structure further comprises an adhesive layer, and the sealing ring is bonded and fixed to the end surface of the opening end through the adhesive layer.

8. The battery device according to claim 4, characterized in that: The sealing ring is located at a side of the clamping groove facing the assembly space.

9. The battery device according to claim 8, characterized in that: At least one end of the clamping groove is provided with an entry opening for inserting the end of the clamping protrusion, and the extension directions of any two of the clamping grooves are parallel to each other.

10. The battery device according to claim 9, characterized in that: The entrance openings are arranged at both ends of the clamping slot.

11. The battery device according to claim 9, characterized in that: The extending directions of the two first straight sides are parallel to each other, and the extending direction of the clamping groove and / or the clamping protrusion is consistent with the extending direction of the first straight side.

12. The battery device according to claim 4, characterized in that: The sealing ring is located at a side of the clamping groove away from the assembly space.

13. The battery device according to any one of claims 1 to 12, characterized in that: The snap-fitting protrusion includes a main body and a wing protrusion arranged on at least one side of the main body, the snap-fitting groove includes a first groove space and a second groove space, the first groove space is connected to the second groove space, the main body is accommodated in the first groove space, and the wing protrusion is accommodated and snap-fitted in the second groove space.

14. The battery device according to claim 13, characterized in that: At least one wing protrusion is respectively provided on both sides of the main body, and the multiple wing protrusions are symmetrically arranged relative to the main body; at least one second groove space is respectively provided on the groove walls on both sides of the first groove space, and the multiple wing protrusions are arranged one-to-one with the multiple second groove spaces.

15. The battery device according to claim 13, characterized in that: The wing protrusion is provided with a guiding inclined surface for guiding the clamping protrusion to insert into the clamping groove.

16. An energy storage device, characterized in that: The energy storage device comprises a battery device as described in any one of claims 1 to 15, and the battery device is used to store or provide electrical energy.

17. An electrical equipment, characterized in that: Including electrical load; The electrical equipment further comprises a battery device as claimed in any one of claims 1 to 15, and the electrical load is electrically connected to the battery device; Alternatively, the electrical equipment includes the energy storage device as claimed in claim 16, and the electrical load is electrically connected to the energy storage device; The battery device is used to store or provide electrical energy to electrical loads.

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