Energy storage device, battery pack assembly and energy storage battery cabinet

Abstract

Disclosed in the present application is an energy storage device, comprising a box body, a support frame, and an elastic member. The box body comprises a sealing mechanism arranged at the top thereof; the support frame is arranged at the bottom of the box body, and the support frame is used for supporting the box body; and the elastic member is arranged at the bottom of the box body and / or the top of the box body, and the elastic member abuts against the box body so as to reduce vibration of the energy storage device. The present application further provides a battery pack assembly and an energy storage battery cabinet.

Description

Energy storage device, battery pack assembly and energy storage battery cabinet

[0001] The present application claims priority to the Chinese patent application No. 202410868882.7, filed on June 29, 2024, and entitled "Energy storage device, battery pack assembly and energy storage battery cabinet", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of energy storage batteries, in particular to an energy storage device, a battery pack assembly and an energy storage battery cabinet. BACKGROUND

[0003] In some prior art battery packs, the upper cover and the lower box are sealed by foamed cotton. The foamed cotton sealing not only can realize the sealing of complex structure, but also can easily disassemble the foamed cotton and avoid damage to electronic devices during the sealing process. However, the existing battery pack is easy to cause the foamed cotton sealing between the upper cover and the lower box to fail under vibration, reducing the sealing effect of the battery pack.

[0004] SUMMARY

[0005] The present application aims to provide an energy storage device, a battery pack assembly provided with the energy storage device, and an energy storage battery cabinet provided with the battery pack assembly.

[0006] In a first aspect, the present application discloses an energy storage device, comprising a box, a support frame and an elastic piece, the box comprising a sealing mechanism arranged at the top thereof; the support frame is arranged at the bottom of the box and is used for supporting the box; the elastic piece is arranged at the bottom of the box and / or the top of the box, and the elastic piece abuts against the box to reduce the vibration of the energy storage device.

[0007] In a second aspect, the present application discloses a battery pack assembly, comprising a plurality of energy storage devices, each energy storage device comprising a box, a support frame and an elastic piece, the box comprising a sealing mechanism arranged at the top thereof; the support frame is arranged at the bottom of the box and is used for supporting the box; the elastic piece is arranged at the bottom of the box and / or the top of the box, and the elastic piece abuts against the box to reduce the vibration of the energy storage device; a plurality of the energy storage devices are stacked together, and the elastic piece is arranged between each adjacent two energy storage devices, the elastic piece has a first abutting force abutting against one of the boxes, and the elastic piece also has a second abutting force abutting against another adjacent box, and the first abutting force is equal to the second abutting force.

[0008] In a third aspect, the application discloses a battery cabinet, which comprises a shelf and a battery pack assembly, a plurality of energy storage devices of the battery pack assembly are stacked in the shelf, a support frame of each of the energy storage devices is connected to the shelf, and a support force of the shelf for each of the energy storage devices is equal to a gravity of the energy storage device.

[0009] The bottom of the box of the energy storage device is provided with a support frame for supporting the box, and the bottom and / or the top of the box is provided with an elastic member which elastically abuts against the box, so that vibration of the energy storage device is reduced, the sealing connection between the sealing mechanism and the box is prevented from loosening, the sealing failure of the sealing mechanism is avoided, and the sealing effect of the energy storage device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the application or the background art, the following will describe the drawings needed to be used in the embodiments of the application or the background art.

[0011] FIG. 1 is a perspective structural schematic view of a battery cabinet in an embodiment of the application;

[0012] FIG. 2 is a perspective structural exploded schematic view of the battery cabinet in FIG. 1;

[0013] FIG. 3 is a further perspective structural schematic view of the battery cabinet in FIG. 2;

[0014] FIG. 4 is a perspective structural enlarged view of a battery pack assembly in FIG. 3;

[0015] FIG. 5 is an enlarged view of a V portion in FIG. 4;

[0016] FIG. 6 is an enlarged view of a VI portion in FIG. 4;

[0017] FIG. 7 is a perspective structural enlarged view of the battery pack assembly in FIG. 4;

[0018] FIG. 8 is a perspective structural schematic view of the battery pack assembly in FIG. 7 from another perspective;

[0019] FIG. 9 is a perspective structural exploded schematic view of one of the energy storage devices in FIG. 7;

[0020] FIG. 10 is a perspective structural schematic view of the energy storage device in FIG. 9 from another perspective;

[0021] FIG. 11 is a perspective structural exploded schematic view of the box in FIG. 9;

[0022] FIG. 12 is a perspective structural exploded schematic view of the support frame and the elastic member in FIG. 9;

[0023] FIG. 13 is a perspective structural schematic view of the support frame and the elastic member in FIG. 12 from another perspective;

[0024] Fig. 14 is an enlarged view of one of the elastic members in Fig. 12;

[0025] Fig. 15 is a side view of the elastic member in Fig. 14;

[0026] Fig. 16 is a parameterized design method of the stiffness matching of the elastic member in Fig. 14;

[0027] Fig. 17 is a cross-sectional view of one of the energy storage devices in Fig. 7;

[0028] Fig. 18 is an enlarged view of portion XVIII in Fig. 17;

[0029] Fig. 19 is an enlarged view of the shelf in Fig. 3;

[0030] Fig. 20 is an exploded view of the shelf in Fig. 19;

[0031] Fig. 21 is a cross-sectional view of one of the battery pack assemblies in Fig. 4;

[0032] Fig. 22 is a cross-sectional view of the battery pack assembly in Fig. 21;

[0033] Fig. 23 is a stress cloud diagram of the sealing stress of the cover and the receiving box of the energy storage device in the prior art by screw connection;

[0034] Fig. 24 is a stress cloud diagram of the sealing stress of the cover and the receiving box of the energy storage device in the present application by elastic member;

[0035] Explanation of reference signs: 100, energy storage battery cabinet; 30, battery pack assembly; 31, energy storage device; 33, box body; 330, sealing mechanism; 331, first sealing ring; 332, second sealing ring; 334, third sealing ring; 335, containing box; 3351, bottom wall; 3351a, first positioning groove; 3351b, second positioning groove; 3351c, positioning column; 3353, side wall; 3354, containing space; 3355, end wall; 3356, first waterproof groove; 3357, connecting edge; 3358, first abutting edge; 337, cover body; 3373, second waterproof groove; 3375, second abutting edge; 35, support frame; 351, first support piece; 3512, first fixing hole; 353, second support piece; 3532, second fixing hole; 3534, wire groove; 355, support beam; 3551, first locking hole; 3553, second locking hole; 3554, third locking hole; 357, support; 3572, fixing strip; 3574, support block; 3576, through hole; 37, elastic piece; 372, wave crest; 374, wave trough; 50, shelf; 52, base; 521, first base strip; 523, second base strip; 54, stand column; 543, first positioning hole; 55, mounting space; 56, support rod; 562, first connecting hole; 564, second connecting hole; 57, first connecting strip; 574, second positioning hole; 58, second connecting strip; 60, electrical control box; 70, shell; 71, back plate; 73, side plate; 75, door plate; 77, top plate; 200, screw. DETAILED DESCRIPTION

[0036] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0037] Please refer to FIG. 1 to FIG. 3, the energy storage battery cabinet 100 in one embodiment of the present application includes a battery pack assembly 30, a shelf 50, an electrical control box 60 and an outer shell 70; the battery pack assembly 30 includes a plurality of energy storage devices 31, the plurality of energy storage devices 31 are stacked together and installed in the shelf 50, the electrical control box 60 is stacked on the top of the shelf 50, the outer shell 70 wraps the shelf 50 and the electrical control box 60, the electrical control box 60 is loaded with circuit boards, various control electrical elements and power components, and the electrical control box 60 is used for control, protection and monitoring of the electrical system of the energy storage battery cabinet 100, etc. In this embodiment, the battery pack assembly 30 is stacked together by 5 energy storage devices 31, the shelf 50 is a rectangular shelf, the electrical control box 60 is a rectangular box body; the outer shell 70 includes a back plate 71, two opposite side plates 73, a door plate 75 and a top plate 77, the back plate 71 is connected to the back of the shelf 50, the two side plates 73 are respectively connected to the opposite two sides of the shelf 50, the top plate 77 is connected to the top of the electrical control box 60, one side of the door plate 75 is rotatably connected to one side of the front of the shelf 50, and the back plate 71, the two side plates 73, the top plate 77 and the door plate 75 together enclose a storage space for storing the shelf 50 and the electrical control box 60.

[0038] As shown in FIGS. 4-11, each energy storage device 31 includes a box 33, a support frame 35, and an elastic member 37. The box 33 includes a receiving box 335, a cover 337 covering the receiving box 335, and a sealing mechanism 330 disposed on the top of the cover 337. The battery pack assembly 30 includes a plurality of boxes, and two adjacent boxes include a first box and a second box. The elastic member 37 is disposed between the bottom of the first box and the top of the second box. The first box and the second box each include the receiving box 335 and the cover 337 covering the receiving box 335. That is, the elastic member 37 is disposed between two adjacent energy storage devices 31. The elastic member 37 is disposed between the bottom of the box 33 of one energy storage device 31 and the top of the box 33 of another energy storage device 31. The sealing mechanism 330 is disposed between the receiving box 335 and the cover 337. The sealing mechanism 330 includes a first sealing ring 331, a second sealing ring 332, and a third sealing ring 334. The first sealing ring 331 and the second sealing ring 332 are clamped and sealed by the receiving box 335 and the cover 337. The elastic member 37 elastically abuts against the cover 337, so that the cover 337 abuts against the first sealing ring 331. The third sealing ring 334 is sealed at the intersection of the receiving box 335 and the cover 337. The support frame 35 is disposed at the bottom of the box 33 and is used to support the box 33. The elastic member 37 is disposed at the bottom of the box 33 and / or the top of the box 33. In this embodiment, the elastic member 37 is disposed at the bottom of the box 33. The elastic member 37 abuts against the box 33 to reduce the vibration of the energy storage device 31, so that the sealing mechanism 330 can be sealingly connected to the box. Specifically, the elastic member 37 abuts against the receiving box 335, so that the receiving box 335 and the cover 337 clamp and seal the sealing mechanism 330. That is, the first sealing ring 331, the second sealing ring 332, and the third sealing ring 334 can be sealingly connected to the receiving box 335 and the cover 337, thereby improving the sealing effect of the energy storage device 31. The support frame 35 of each energy storage device 31 is connected to the shelf 50, and the shelf 50 is used to support each energy storage device 31 with a support force equal to the weight of the energy storage device 31. The elastic member 37 is disposed between each two adjacent energy storage devices 31. The elastic member 37 has a first abutting force F1 abutting against one of the boxes 33. The elastic member 37 also has a second abutting force F2 abutting against the other adjacent box 33. The first abutting force F1 is equal to the second abutting force. The first abutting force F1 is less than the weight of the one of the boxes 33.

[0039] It can be understood that the top refers to the end of the energy storage battery cabinet 100 placed away from the support surface during normal use, and the bottom refers to the end close to the support surface during normal use. The box 33 of the energy storage device 31 is provided with battery cells, battery modules, protection plates, battery management systems, heat dissipation systems, electrical systems, etc. In the description of the embodiments of the present application, "connection" includes both direct connection and indirect connection, such as A and B connection including A and B direct connection or connection through a third element C or more other elements. The connection also includes integrated connection and non-integrated connection. Integrated connection means that A and B are integrally formed and connected, and non-integrated connection means that A and B are non-integrally formed and connected.

[0040] The bottom of the box 33 of the energy storage device 31 is provided with a support frame 35 for supporting the box 33, and the bottom of the box 33 is provided with an elastic member 37 elastically abutting against the box 33, which can reduce the vibration of the energy storage device 31 to prevent the sealing mechanism 330 from loosening the sealed connection with the box 33. The elastic member 37 has a first abutting force F1 and a second abutting force F2 abutting against the box 33, so that the first sealing ring 331 and the second sealing ring 332 are more firmly clamped by the receiving box 335 and the cover 337, to avoid the sealing failure of the sealing mechanism 330, and improve the sealing effect of the energy storage device 31.

[0041] In other embodiments, the top of the box 33 is provided with an elastic member 37 elastically abutting against the top of the box 33 to reduce the vibration of the energy storage device 31, so that the sealing mechanism 330 can be sealingly connected to the box 33. Specifically, the elastic member 37 elastically abuts against the cover 337, so that the first sealing ring 331 and the second sealing ring 332 are sealingly clamped between the receiving box 335 and the cover 337, thereby improving the sealing effect of the energy storage device 31.

[0042] In other embodiments, the top and bottom of the box 33 are both provided with elastic members 37, one of which elastically abuts against the top of the box 33, and the other of which elastically abuts against the bottom of the box 33, to reduce the vibration of the energy storage device 31, so that the sealing mechanism 330 can be sealingly connected to the box 33. Specifically, one of the elastic members 37 elastically abuts against the receiving box 335, and the other of the elastic members 37 elastically abuts against the cover 337, so that the first sealing ring 331 and the second sealing ring 332 are sealingly clamped between the receiving box 335 and the cover 337, thereby improving the sealing effect of the energy storage device 31.

[0043] As shown in FIGS. 9-11, the bottom surface of the accommodation box 335 is provided with the elastic members 37, that is, the surface of the accommodation box 335 away from the cover 337 is provided with the elastic members 37. In this embodiment, the bottom surface of the box 33 is provided with the elastic members 37 on opposite sides along the width direction of the bottom surface. The elastic members 37 elastically abut against the accommodation box 335, so that the accommodation box 335 abuts against the first sealing ring 331 and the second sealing ring 332, thereby improving the sealing effect of the first sealing ring 331 and the second sealing ring 332 on the space between the accommodation box 335 and the cover 337. Specifically, the accommodation box 335 includes a rectangular bottom wall 3351, two side walls 3353 provided on opposite sides of the bottom wall 3351 along the width direction thereof, and two end walls 3355 provided on opposite ends of the bottom wall 3351 along the length direction thereof. The bottom wall 3351, the two side walls 3353, and the two end walls 3355 together define an accommodation space 3354 for accommodating the battery cells, the battery modules, and the like. The support frame 35 is provided on the bottom surface of the bottom wall 3351, and the bottom surface of the bottom wall 3351 is provided with the elastic members 37 on opposite sides along the width direction thereof. The bottom surface is the surface away from the electrical control box 60, and the top surface is the surface opposite to the bottom surface.

[0044] In other embodiments, the bottom surface of the bottom wall 3351 is provided with the elastic members 37 on opposite sides and opposite ends thereof, and the elastic members 37 elastically abut against the bottom wall 3351. Optionally, the accommodation box 335 is made of glass fiber reinforced plastic, so as to improve the insulation performance of the accommodation box 335.

[0045] The support frame 35 comprises a first support member 351 and a second support member 353, which are arranged at the bottom of the box body 33 at a distance from each other, and an elastic member 37 is arranged between the first support member 351 and the second support member 353; alternatively, the support frame 35 comprises two first support members 351 and at least one second support member 353, the two first support members 351 are arranged at the bottom of the box body 33 at opposite ends along the length direction of the box body 33, and the at least one second support member 353 is arranged at the bottom of the box body 33 and located between the two first support members 351, and an elastic member 37 is arranged between each first support member 351 and the second support member 353, one end of the elastic member 37 is connected to the first support member 351, and the opposite end of the elastic member 37 is connected to the second support member 353. The bottom surface of the box body 33 is provided with two first positioning grooves 3351a and at least one second positioning groove 3351b, the two first positioning grooves 3351a are located at opposite ends along the width direction of the box body 33, and the second positioning groove 3351b is located between the two first positioning grooves 3351a, and the first positioning groove 3351a is parallel to the second positioning groove 3351b; the two first support members 351 are positioned in the two first positioning grooves 3351a, and the at least one second support member 353 is positioned in the at least one second positioning groove 3351b. In this embodiment, the bottom wall 3351 of the receiving box 335, away from the bottom surface of the receiving space 3354, is provided with two first positioning grooves 3351a and two second positioning grooves 3351b parallel to each other, the two first positioning grooves 3351a are located at opposite ends along the width direction of the bottom wall 3351, and the two second positioning grooves 3351b are located at a distance from each other between the two first positioning grooves 3351a, and opposite ends of the first positioning groove 3351a pass through opposite side walls 3353 of the receiving box 335, and opposite ends of the second positioning groove 3351b pass through opposite side walls 3353 of the receiving box 335. The support frame 35 comprises two first support members 351 and two second support members 353, the two first support members 351 are positioned in the two first positioning grooves 3351a, and the two second support members 353 are positioned in the two second positioning grooves 3351b.

[0046] Optionally, the bottom surface of the bottom wall 3351 is provided with positioning posts 3351c on opposite sides along the width direction thereof, and the elastic members 37 are positioned on the bottom wall 3351 through the positioning posts 3351c. In this embodiment, the elastic members 37 are respectively arranged between each first support member 351 and the adjacent second support member 353 and between the two second support members 353 on one side of the bottom wall 3351; the elastic members 37 are respectively arranged between each first support member 351 and the adjacent second support member 353 and between the two second support members 353 on the opposite side of the bottom wall 3351, and the opposite ends of the elastic members 37 along the length direction thereof are respectively connected to the two second support members 353; the bottom wall 3351 is provided with three positioning posts 3351c on opposite sides thereof, the opposite ends between each first positioning slot 3351a and the opposite second positioning slot 3351b are respectively provided with a positioning post 3351c, and the opposite ends between the two second positioning slots 3351b are respectively provided with a positioning post 3351c, and each positioning post 3351c is used for positioning the corresponding elastic member 37.

[0047] As shown in FIG. 11 and FIG. 14-15, the top surface of the accommodating box 335 is provided with a first waterproof groove 3356, which is around the edge of the top surface of the accommodating box 335, and the bottom surface of the cover 337 is provided with a second waterproof groove 3373, which is around the edge of the bottom surface of the cover 337, the first waterproof groove 3356 and the second waterproof groove 3373 are staggered and communicated, the first sealing ring 331 is accommodated in the first waterproof groove 3356, the second sealing ring 332 is accommodated in the second waterproof groove 3373, the first sealing ring 331 surrounds the second sealing ring 332, and there is a space between the first sealing ring 331 and the second sealing ring 332, and the first sealing ring 331 and the second sealing ring 332 are clamped between the accommodating box 335 and the cover 337. Specifically, the accommodating box 335 further includes a connecting rim 3357 protruding from the surrounding surface of the accommodating box 335, the connecting rim 3357 is close to the opening of the accommodating space 3354 of the accommodating box 335, and the front surface of the connecting rim 3357 forms a first abutting rim 3358 between the opening of the accommodating space 3354 and the first waterproof groove 3356; in this embodiment, the connecting rim 3357 is a rectangular frame, and the connecting rim 3357 is sealingly sleeved on the accommodating box 335 close to the opening of the accommodating space 3354. The top surface of the connecting rim 3357 is coplanar with the top surface of the accommodating box 335, the first waterproof groove 3356 is arranged on the top surface of the connecting rim 3357, and the first waterproof groove 3356 surrounds a circle along the length direction of the connecting rim 3357; in this embodiment, the first waterproof groove 3356 is a rectangular waterproof ring groove, the first waterproof groove 3356 surrounds a circle around the accommodating box 335, and the first abutting rim 3358 is a rectangular flange. The second waterproof groove 3373 is close to the outer circumferential surface of the cover 337 and surrounds a circle along the edge of the cover 337, so as to form a second abutting rim 3375 on the bottom surface of the cover 337 close to the outer circumferential surface of the cover 337; in this embodiment, the cover 337 is a rectangular plate, and the second waterproof groove 3373 is a rectangular waterproof ring groove. When the cover 337 covers the accommodating box 335, the first abutting rim 3358 is inserted into the second waterproof groove 3373, and the first abutting rim 3358 abuts against the second sealing ring 332; at the same time, the second abutting rim 3375 is inserted into the first waterproof groove 3356, and the second abutting rim 3375 abuts against the first sealing ring 331.

[0048] Optionally, the cover 337 and the accommodating box 335 can be fixedly connected through screws. Specifically, the four corners of the cover 337 and the accommodating box 335 are fixedly connected through screws, and / or the periphery of the cover 337 and the accommodating box 335 are fixedly connected through screws. Optionally, the four corners of the cover 337 and the accommodating box 335 can also be fixedly connected through spring screws, which can increase the stability of the energy storage device 31 during road transportation, that is, the spring screws can also absorb small vibrations of the energy storage device 31, so as to avoid loosening of the first sealing ring 331, the second sealing ring 332 and the third sealing ring 334 during transportation.

[0049] As shown in FIGS. 9-10 and 12-13, the first support member 351 is a support bar, and opposite ends of the support bar extend out of opposite side surfaces of the box body 33, i.e., the opposite ends of the support bar extend out of two side walls 3353, respectively. The first support member 351 is provided with first fixing holes 3512 at opposite ends thereof along a length direction of the first support member 351. The second support member 353 is a support cylinder for accommodating a cable, i.e., the cable is arranged in a cavity of the support cylinder. The support cylinder extends out of opposite side surfaces of the box body 33, i.e., opposite ends of the support cylinder extend out of two side walls 3353, respectively. The second support member 353 is provided with second fixing holes 3532 at opposite ends thereof along a length direction of the second support member 353. The second support member 353 is provided with wire guide grooves 3534 along a length direction thereof, and the wire guide grooves 3534 extend through opposite end surfaces of the second support member 353, respectively.

[0050] Optionally, the support frame 35 further comprises two support beams 355 and a support base 357. The two support beams 355 are located at opposite sides of the bottom of the box body 33 along a width direction of the box body 33, respectively. The end of each first support member 351 is connected to the support beam 355 through the support base 357, and the end of the second support member 353 is connected to the support beam 355 through the support base 357. In the embodiment, the support beam 355 is a rectangular positioning bar, and the support beam 355 is provided with a first locking hole 3551 and two second locking holes 3553 at opposite ends of a top surface of the support beam 355. The two second locking holes 3553 are located between the two first locking holes 3551 at intervals. The ends of the two first support members 351 are fixedly connected to the two first locking holes 3551, respectively, and the ends of the two second support members 353 are fixedly connected to the two second locking holes 3553, respectively. Opposite ends of a side surface of one support beam 355 away from the other support beam 355 are provided with third locking holes 3554. The support base 357 is a reverse T-shaped structure, and the support base 357 comprises a fixed bar 3572 and a support block 3574 protruding from a top surface of the fixed bar 3572. The fixed bar 3572 is fixedly connected to the top surface of the support beam 355. Optionally, the fixed bar 3572 can be connected to the support beam 355 by, but not limited to, screwing, clamping or gluing. The support block 3574 is provided with a through hole 3576 extending through the fixed bar 3572.

[0051] Optionally, at least one of the first support 351, the second support 353, the support beam 355 and the support base 357 is made of glass fiber reinforced plastic, and preferably, all of the first support 351, the second support 353, the support beam 355 and the support base 357 are made of glass fiber reinforced plastic. The support frame 35 plays a role of protection, insulation and fire resistance during use and installation, and has a good supporting and protective effect on the energy storage device 31. Because the glass fiber reinforced plastic has excellent insulation performance and electric shock resistance, the personnel and the energy storage battery cabinet 100 can be protected from electrical hazards, and the safety and reliability of the electrical system are improved.

[0052] As shown in FIGS. 14-15, the elastic member 37 is a wave-shaped elastic sheet having a plurality of wave crests and a plurality of wave troughs along the length direction of the elastic member, which can be but is not limited to a metal sheet element, a plastic sheet element or the like. The wave crests of the wave-shaped elastic sheet abut against the bottom surface of the cabinet 33. Specifically, the elastic member 37 includes a plurality of wave crests 372 and a plurality of wave troughs 374. The wavelength L of the wave-shaped elastic sheet ranges from 20 mm to 30 mm, and can be but is not limited to 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm or the like. The wave crest height H of the wave-shaped elastic sheet ranges from 10 mm to 20 mm, and can be but is not limited to 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm or the like. In other embodiments, the elastic member 37 can also be an elastic sheet having a partially flat sheet.

[0053] The rigidity of the elastic member 37 should match the weight of the energy storage device 31 and the rigidity of the rubber sealing ring, which is the first sealing ring 331 and the second sealing ring 332, and specifically satisfies the following formula: K1*△X max ≤G; E1*∈ max ≤G;

[0054] wherein K1 is the elastic rigidity of the elastic member 37, △X max is the maximum elastic deformation of the elastic member 37, E1 is the elastic modulus of the sealing rubber ring, and ∈ max is the maximum elastic strain of the sealing rubber ring.

[0055] The force received by the elastic member 37 and the force received by the sealing rubber ring are action and reaction forces. The following formula is satisfied: K1*△X max =E1*ε max ;

[0056] wherein K1 is the elastic rigidity of the elastic member 37, △X maxE1 is the elastic modulus of the sealing rubber ring, and ∈ max is the maximum elastic strain of the sealing rubber ring.

[0057] As shown in FIG. 16, different sealing rubber rings correspond to appropriate stiffness of the elastic member 37. The form (stiffness) of the elastic member 37 can be determined through simulation analysis. The simulation method is as follows:

[0058] Finite element modeling;

[0059] Establishing the constitutive relation of the rubber sealing ring material and the constitutive relation of the battery shell material;

[0060] Defining the contact relationship of the connecting structure;

[0061] Defining the boundary constraint condition;

[0062] Applying the energy storage device load;

[0063] Finite element calculation and post-processing;

[0064] Determining the form (stiffness) of the elastic sheet.

[0065] Optionally, the stiffness of the elastic member 37 is adjusted by adjusting the waveform density of the elastic member 37, adjusting the material of the elastic member 37, and adjusting the thickness of the elastic member 37.

[0066] Optionally, the relationship between the stiffness of the elastic member 37 and the waveform density of the elastic member 37 is as follows:

[0067] K = n * k1, wherein K is the stiffness of the elastic member 37, n is the number of wave peaks of the elastic member 37, and k1 is the elastic stiffness of each wave peak. Therefore, the stiffness of the elastic member 37 is positively correlated with the wave peak density of the waveform elastic sheet, that is, the greater the wave peak density of the waveform elastic sheet, the greater the stiffness of the elastic member 37.

[0068] Optionally, the relationship between the stiffness of the elastic member 37 and the material of the elastic sheet is that the stiffness of the elastic member 37 is positively correlated with the elastic modulus of the waveform elastic sheet, that is, the greater the elastic modulus E of the material of the waveform elastic sheet, the greater the stiffness of the elastic member 37.

[0069] Optionally, the stiffness of the elastic member 37 is positively correlated with the thickness of the waveform elastic sheet, and specifically, under certain conditions, wherein t is the material thickness of the waveform elastic sheet. The greater the material thickness of the waveform elastic sheet, the greater the total stiffness of the waveform elastic sheet, and the greater the stiffness of the elastic member 37.

[0070] Optionally, the elastic member 37 can be, but is not limited to, a spring, a plate shock absorber, a high-elastic sponge filler, or an elastic block.

[0071] As shown in FIG. 9-13 and FIG. 17-18, when assembling the energy storage device 31, the first sealing ring 331 is accommodated in the first waterproof groove 3356, the second sealing ring 332 is accommodated in the second waterproof groove 3373, the cover 337 is accommodated on the top of the box 335 together with the second sealing ring 332, so that the first abutting edge 3358 is accommodated in the second waterproof groove 3373 and abuts against the second sealing ring 332, the second abutting edge 3375 is accommodated in the first waterproof groove 3356 and abuts against the first sealing ring 331, so that the first sealing ring 331 and the second sealing ring 332 are clamped by the cover 337 and the box 335; the third sealing ring 334 is sealingly sleeved around the cover 337 and sealingly connected to the front surface of the connecting edge 3357. The waterproof sealing of the energy storage device 31 is achieved as follows: the second sealing ring 332 is the first waterproof for the internal cooling liquid of the energy storage device 31, when the cooling liquid penetrates the first waterproof into the first waterproof groove 3356 of the box 335, the first sealing ring 331 in the first waterproof groove 3356 starts to work and performs secondary waterproof, in this process, the amount of cooling liquid penetrating out of the first waterproof is getting smaller and smaller, when passing through the second sealing ring 332, the penetrating cooling liquid has almost no pressure and no flowability, and complete sealing is achieved. The second sealing ring 332, the first sealing ring 331 and the third sealing ring 334 need to be tightly fixed by the elastic member 37 to ensure the sealing effect. Two first supporting members 351 are respectively fixed to two first positioning grooves 3351a of the box 335, the upper part of the first supporting member 351 is embedded in the first positioning groove 3351a of the box 335, so that each first supporting member 351 has two side walls 3353 respectively exposed at the opposite ends along the length direction. Optionally, the first supporting member 351 and the box 335 can be fixedly connected by but not limited to screwing, clamping, welding and the like; two second supporting members 353 are respectively fixed to two second positioning grooves 3351b of the box 335, the upper part of the second supporting member 353 is embedded in the second positioning groove 3351b of the box 335, so that each second supporting member 353 has two side walls 3353 respectively exposed at the opposite ends along the length direction; optionally, the second supporting member 353 and the box 335 can be fixedly connected by but not limited to screwing, clamping, welding and the like.The two support beams 355 are respectively arranged at the opposite sides of the bottom of the box body 33. The opposite ends of each first support member 351 are respectively fixedly connected to the two support beams 355 through two supports 357. Specifically, two locking members such as screws are respectively locked in the corresponding two first locking holes 3551 through the two first fixing holes 3512 and the two through holes 3576, and the support 357 is connected between the first support member 351 and the support beam 355. The opposite ends of each second support member 353 are respectively fixedly connected to the two support beams 355 through two supports 357. Specifically, two locking members such as screws are respectively locked in the corresponding two second locking holes 3553 through the two second fixing holes 3532 and the two through holes 3576, and the support 357 is connected between the second support member 353 and the support beam 355. An elastic member 37 is arranged between each first support member 351 and the adjacent second support member 353 close to the side wall 3353, so that one end of the elastic member 37 is connected to the first support member 351, the opposite end of the elastic member 37 is connected to the second support member 353, and the elastic member 37 is positioned by the corresponding positioning column 3351c. An elastic member 37 is arranged between the two second support members 353 close to the side wall 3353, so that the opposite ends of the elastic member 37 are respectively connected to the two second support members 353, and the elastic member 37 is positioned by the corresponding positioning column 3351c.

[0072] As shown in FIGS. 9-10 and FIGS. 19-20, the shelf 50 comprises a base 52, columns 54 and support rods 56, the columns 54 are arranged on the front surface of the base 52, and the columns 54 enclose a mounting space 55 for accommodating the battery pack assembly 30, and the support frame 35 of each energy storage device 31 is connected to the column 54. In this embodiment, the base 52 is a rectangular seat body, and the columns 54 are arranged at the four corners of the front surface of the base 52, and the base 52 and the four columns 54 enclose a rectangular mounting space 55. Specifically, the base 52 comprises three first base bars 521 arranged in parallel and spaced apart, and three second base bars 523 arranged in parallel and spaced apart, and the three first base bars 521 are fixedly connected to the three second base bars 523 to form the rectangular base 52. The two columns 54 at each end of the base 52 are fixedly connected by a plurality of first connecting bars 57, the two columns 54 at each side of the base 52 are fixedly connected by a second connecting bar 58 at the bottom, and the four columns 54 are fixedly connected to the front surface of the base 52 by the first connecting bars 57 and the second connecting bar 58 at the bottom. The side surface of each column 54 is provided with a plurality of first positioning holes 543 arranged at intervals along the length direction of the column 54; in this embodiment, the side surface of each column 54 is provided with five first positioning holes 543 arranged at intervals along the length direction of the column 54. The side surface of the first connecting bar 57 away from the base 52 is provided with a plurality of second positioning holes 574 arranged at intervals along the length direction of the first connecting bar 57. The opposite ends of the support rod 56 are respectively provided with first connecting holes 562, and the middle part of the support rod 56 is provided with a plurality of second connecting holes 564 arranged at intervals along the length direction of the support rod 56. Optionally, the base 52, the columns 54 and the support rods 56 are made of metal material, so that the shelf 50 has high structural strength and can support the energy storage device 31.

[0073] As shown in FIGS. 1-6, when assembling the energy storage battery cabinet 100, the plurality of energy storage devices 31 are respectively accommodated in the mounting spaces 55 of the shelves 50, such that the opposite ends of the support beams 355 on one side of each energy storage device 31 are respectively fixedly connected to two upright columns 54, and the opposite ends of the support beams 355 on the other side are respectively fixedly connected to another two upright columns 54; specifically, the locking members such as screws are locked to the corresponding first positioning holes 543 through the third locking holes 3554. The plurality of energy storage devices 31 are stacked in the shelves 50, each support frame 35 is fixedly connected to the shelf 50, so that the energy storage device 31 is supported by the shelf 50; the load of each energy storage device 31 is transmitted to the shelf 50, the elastic member 37 elastically abuts against one of the boxes 33 between each adjacent two energy storage devices 31, the elastic member 37 has a first abutting force abutting against the one box 33, the elastic member 37 elastically abuts against another box 33, the elastic member 37 has a second abutting force abutting against the adjacent another box 33, and the first abutting force is equal to the second abutting force; specifically, the elastic member 37 of one of the energy storage devices 31 abuts against the cover 337 of the other energy storage device 31, and the elastic member 37 of the one energy storage device 31 abuts against the bottom surface of the receiving box 335 of the box 33 of the one energy storage device 31, at this time, the first abutting force of the elastic member 37 is equal to the reaction force received by the sealing mechanism, so that the first sealing ring 331 and the second sealing ring 332 can be sealingly connected between the cover 337 and the receiving box 335. The opposite ends of the plurality of support rods 56 are respectively fixedly connected to the support rods 56 away from the base 52 at one end, specifically, the first connecting holes 562 at the opposite ends of each support rod 56 are respectively opposite to two second positioning holes 574, and two locking members such as screws are respectively fixedly connected to the two second positioning holes 574 through the two first connecting holes 562. The electrical control box 60 is fixedly connected to the plurality of support rods 56, and wires and cooling liquid pipes are installed on the electrical control box 60 and the energy storage devices 31, specifically, the energy storage devices 31 are connected through power lines, and the energy storage devices 31 of the immersion system are connected in parallel by the cooling liquid main inlet pipe and the outlet pipe. The back plate 71 is fixedly connected to the back of the shelf 50, the two side plates 73 are respectively fixedly connected to the opposite sides of the shelf 50, the top plate 77 is fixedly connected to the top of the back plate 71 and the two side plates 73, and one side of the door plate 75 is rotatably connected to one of the side plates 73. Optionally, the support rods 56 are insulating bakelite, so as to realize the isolation of the electrical control box 60 and the battery pack assembly 30, so that the electrical control box 60 has higher electrical safety with the shelf 50 and the battery pack assembly 30. The load of each energy storage device 31 in the energy storage battery cabinet 100 is transmitted to the support 357 through the first support 351 and the second support 353, then transmitted to the support beam 355 by the support 357, and then transmitted to the upright column 54 by the support beam 355, so that the structure of each element of the energy storage battery cabinet 100 is compact.

[0074] As shown in FIGS. 21-22, the self-gravity of each energy storage device 31 is G, the supporting force of the support frame 35 of the energy storage device 31 is F, the elastic member 37 has an elastic bending force, the downward pressure of the elastic member 37 on the cover 337 is N1, the upward pressure of the elastic member 37 on the receiving box 335 is N2, the same elastic member 37 is selected to control the same compression amount, the downward pressure N1 is equal to the upward pressure N2, the force balance relationship of the energy storage device 31 is G+N1=F+N2, since N1=N2, G=F, thus the gravity of the energy storage device 31 will not be transmitted downward to the shelf 50 through the elastic member 37. The elastic member 37 of each layer of energy storage devices 31 of the energy storage battery cabinet 100 is uniformly stressed and will not be affected by the stacking height of the energy storage device 31; the static force balance relationship of the energy storage device 31 is G+N1=F1+F2+F3+F4+N2, wherein G is the gravity of the energy storage device 31, N1 is the downward pressure of the elastic member 37 on the cover 337, F1 is the supporting force of one of the first support members 351 on the energy storage device 31, F4 is the supporting force of the other first support member 351 on the energy storage device 31, F2 is the supporting force of one of the second support members 353 on the energy storage device 31, and F3 is the supporting force of the other second support member 353 on the energy storage device 31. The specifications of each elastic member 37 are the same, and the compression amount of each elastic member 37 is the same, thus N1=N2 and F=F1+F2+F3+F4.

[0075] Since N1=N2, G=F1+F2+F3+F4. Thus, the weight of the energy storage device 31 is transmitted to the shelf 50 through the support frame 35, and the weight of the energy storage device 31 will not be transmitted to the underlying energy storage device 31 through the elastic member 37, so that the stress of the energy storage devices 31 of each layer is uniform. The weight of each energy storage device 31 is directly transmitted to the shelf 50 to ensure that each adjacent two energy storage devices 31 have the same gap, so as to ensure that each layer of elastic member 37 has the same compression amount ΔX, and each layer of energy storage device 31 selects the elastic member 37 with the same stiffness, thus the elastic member 37 of each layer of energy storage device 31 is stressed the same N=K△X. The upward pressure N2 of the elastic member 37 on the receiving box 335 is less than the gravity G of the energy storage device 31, i.e. N2=G, so as to avoid that the energy storage device 31 is bounced away by the elastic member 37.

[0076] In other embodiments, the elastic member 37 can also be arranged between the support beam 355 of the support frame 35 and the box body 33. Specifically, the two support beams 355 at the bottom of the box body 33 are provided with the elastic member 37 elastically abutting against the bottom surface of the receiving box 335 of the box body 33; the two support beams 355 at the top of the box body 33 are provided with the elastic member 37 elastically abutting against the top surface of the cover 337 of the box body 33, and the first sealing ring 331 and the second sealing ring 332 are sealingly clamped by the receiving box 335 and the cover 337.

[0077] As shown in the sealing stress nephogram of FIG. 23, the cover of the prior art immersion energy storage device and the receiving box are only connected by a plurality of screws 200, and the sealing effect is better near the screws 200. However, the immersion energy storage device needs to be filled with coolant and ensure the flow of the coolant, so that the inside of the immersion energy storage battery has a high pressure, which can easily cause sealing failure near the screws 200 in FIG. 23, thereby losing the high protection capability of the immersion energy storage device. In addition, local screw 200 fixation can cause local stress concentration, leading to rubber plastic deformation and sealing failure. The energy storage battery cabinet 100 of the present application has an elastic member 37 between each adjacent two energy storage devices 31. One side of the elastic member 37 elastically abuts against the top surface of the cover 337 of one energy storage device 31, and the other side of the elastic member 37 elastically abuts against the bottom surface of the receiving box 335 of the other energy storage device 31. The first abutting force of the elastic member 37 to the box 33 is greater than the pressure of the receiving box 335 to the cover 337, so that the sealing mechanism 330 of the energy storage device 31, i.e., the first sealing ring 331 and the second sealing ring 332, are clamped by the cover 337 and the receiving box 335, thereby increasing the sealing effect of the energy storage device 31. As shown in the sealing stress nephogram of FIG. 24, the sealing form between the cover 337 and the receiving box 335 changes from point sealing to line sealing, that is, as shown in FIG. 24, the sealing ring between the cover 337 and the receiving box 335 is uniformly stressed, indicating that the sealing and fastening force of the energy storage device 31 is not limited to the vicinity of the screws, but is a uniform rectangle, thereby reducing the sealing failure of the energy storage device 31, and optimizing the sealing effect of the energy storage device 31, thereby achieving high sealing performance of the energy storage device 31. The elastic member 37 also serves as a buffer for the energy storage device 31, preventing the first sealing ring 331 and the second sealing ring 332 from loosening relative to the cover 337 and the receiving box 335.

[0078] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An energy storage device (31), characterized in that, The energy storage device (31) includes: The housing (33) includes a sealing mechanism (330) located on its top; A support frame (35) is disposed at the bottom of the housing (33) and is used to support the housing (33); and An elastic element (37) is provided at the bottom and / or the top of the housing (33), and the elastic element (37) elastically abuts against the housing (33).

2. The energy storage device (31) according to claim 1, characterized in that, The housing (33) includes: First box (33); and The second housing (33) has the elastic element (37) disposed between the bottom of the first housing (33) and the top of the second housing (33). The second housing (33) includes a receiving box (335) and a cover (337) covering the receiving box (335). The sealing mechanism (330) includes a first sealing ring (331). The first sealing ring (331) is sealed and clamped by the receiving box (335) and the cover (337). The elastic element (37) elastically abuts against the cover (337) so that the cover (337) abuts against the first sealing ring (331).

3. The energy storage device (31) according to any one of claims 1 to 2, characterized in that, The bottom surface of the box (33) is provided with an elastic element (37). The box (33) includes a receiving box (335) and a cover (337) covering the receiving box (335). The sealing mechanism (330) includes a first sealing ring (331). The first sealing ring (331) is sealed and clamped by the receiving box (335) and the cover (337). The elastic element (37) elastically abuts against the receiving box (335), so that the receiving box (335) abuts against the first sealing ring (331).

4. The energy storage device (31) according to claim 3, characterized in that, The sealing mechanism (330) further includes a second sealing ring (332), which is sealed and held by the receiving box (335) and the cover (337), and a first sealing ring (331) surrounds the second sealing ring (332), with a gap between the first sealing ring (331) and the second sealing ring (332).

5. The energy storage device (31) according to claim 1, characterized in that, The elastic element (37) is a wave spring, and the crest (372) of the wave spring abuts against the bottom surface of the housing (33).

6. The energy storage device (31) according to claim 5, characterized in that, The wavelength range of the wave spring is 20 mm to 30 mm, and the height range of the wave crest (372) of the wave spring is 10 mm to 20 mm.

7. The energy storage device (31) according to claim 5, characterized in that, The stiffness of the wave spring is positively correlated with the density of the wave crest (372) of the wave spring; the stiffness of the wave spring is positively correlated with the elastic modulus of the wave spring; and the stiffness of the wave spring is positively correlated with the thickness of the wave spring.

8. The energy storage device (31) according to claim 1, characterized in that, The support frame (35) includes a first support member (351) and a second support member (353). The first support member (351) and the second support member (353) are disposed at intervals at the bottom of the box (33). The elastic member (37) is provided between the first support member (351) and the second support member (353).

9. The energy storage device (31) according to claim 8, characterized in that, The support frame (35) includes two first support members (351) and at least one second support member (353). The two first support members (351) are spaced apart from each other at opposite ends of the bottom of the box (33). At least one second support member (353) is located at the bottom of the box (33) and between the two first support members (351). The elastic member (37) is provided between each first support member (351) and the second support member (353).

10. The energy storage device (31) according to claim 9, characterized in that, The bottom surface of the housing (33) is provided with two parallel and spaced first positioning grooves (3351a) and at least one second positioning groove (3351b). The two first positioning grooves (3351a) are respectively located at opposite ends of the housing (33), and the second positioning groove (3351b) is located between the two first positioning grooves (3351a). The second positioning groove (3351b) is parallel to the first positioning groove (3351a). The two first support members (351) are respectively positioned in the two first positioning grooves (3351a), and at least one second support member (353) is positioned in at least one second positioning groove (3351b).

11. The energy storage device (31) according to claim 9, characterized in that, The first support member (351) is a support bar, and the two ends of the support bar extend to the opposite sides of the box (33) along its length direction. The second support member (353) extends to the opposite sides of the box (33) along its length direction.

12. The energy storage device (31) according to claim 9, characterized in that, The second support member (353) is a support cylinder, which is used to thread cables through.

13. The energy storage device (31) according to claim 9, characterized in that, The support frame (35) also includes two support beams (355) and a support (357). The two support beams (355) are located on opposite sides of the bottom of the box (33). The end of each first support member (351) is connected to the support beam (355) through the support (357), and the end of the second support member (353) is connected to the support beam (355) through the support (357).

14. The energy storage device (31) according to claim 13, characterized in that, At least one of the first support member (351), the second support member (353), the support beam (355), and the support (357) is made of fiberglass.

15. The energy storage device (31) according to claim 4, characterized in that, The top surface of the receiving box (335) is provided with a first waterproof groove (3356), which surrounds the edge of the top surface of the receiving box (335). The bottom surface of the cover (337) is provided with a second waterproof groove (3373), which surrounds the edge of the bottom surface of the cover (337). The first waterproof groove (3356) and the second waterproof groove (3373) are misaligned and connected. The first sealing ring (331) is housed in the first waterproof groove (3356), and the second sealing ring (332) is housed in the second waterproof groove (3373). The first sealing ring (331) surrounds the second sealing ring (332). The first sealing ring (331) and the second sealing ring (332) are held by the cover (337) and the receiving box (335).

16. A battery pack assembly (30), characterized in that, The battery pack assembly (30) includes an energy storage device (31) as described in any one of claims 1-15, wherein a plurality of the energy storage devices (31) are stacked together, and an elastic member (37) is provided between each two adjacent energy storage devices (31), the elastic member (37) having a first abutting force against one of the housings (33), and the elastic member (37) also having a second abutting force against the other adjacent housing (33), wherein the first abutting force is equal to the second abutting force.

17. The battery pack assembly (30) according to claim 16, characterized in that, The elastic element (37) of each pair of adjacent energy storage devices (31) elastically abuts against the bottom surface of the receiving box (335) of one of the energy storage devices (31), and the elastic element (37) elastically abuts against the cover (337) of the other energy storage device (31). The receiving box (335) and the cover (337) clamp the sealing mechanism (330). The first abutting force of the elastic element (37) is equal to the reaction force received by the sealing mechanism (330).

18. The battery pack assembly (30) according to claim 16, characterized in that, Coolant is provided between the housing (335) and the cover (337) of the energy storage device (31), and the coolant is kept flowing in the housing (335), so that the interior of the housing (335) exerts pressure on the cover (337), and the first resisting force is greater than the pressure.

19. An energy storage battery cabinet (100), characterized in that, The energy storage battery cabinet (100) includes a shelf (50) and a battery pack assembly (30) as described in any one of claims 16-18. A plurality of energy storage devices (31) of the battery pack assembly (30) are stacked in the shelf (50). The support frame (35) of each energy storage device (31) is connected to the shelf (50). The supporting force of the shelf (50) on each energy storage device (31) is equal to the weight of the energy storage device (31).

20. The energy storage battery cabinet (100) according to claim 19, characterized in that, The shelf (50) includes a base (52) and columns (54). A plurality of columns (54) are disposed on the front of the base (52). The plurality of columns (54) form an installation space (55) for accommodating the battery pack assembly (30). The support frame (35) of each energy storage device (31) is connected to the column (54).

Images