Electrochemical devices and electrical equipment

Abstract

An electrochemical device (100) and an electrical equipment (200), wherein the electrochemical device (100) comprises a housing (10) and a first battery cell assembly (20), wherein the housing (10) comprises a first space, and the first battery cell assembly (20) is arranged in the first space (17). The first battery cell assembly (20) comprises a plurality of first battery cells (20), and the plurality of first battery cells (20) are stacked and arranged along a first direction (X). The housing (10) comprises at least one first structural member (30), and the first structural member (30) and the first battery cell assembly (20) are arranged in an arranged manner along the first direction (X). In the electrochemical device (100), the first structural member (30) can exert pressure on the first battery cell (20) by deformation, thereby reducing the risk of excessive expansion of the first battery cell (20) and improving the service life of the electrochemical device (100).

Description

Electrochemical devices and electrical equipment Technical Field

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

[0002] Currently, in an electrochemical device containing multiple battery cells, the battery cells will expand during use. It is necessary to apply pressure to the battery cells when the battery cells expand in order to increase the service life of the electrochemical device.

[0003] Summary of the Invention

[0004] In view of the above situation, it is necessary to provide an electrochemical device that can apply pressure when the battery cell expands to increase the service life of the electrochemical device.

[0005] An embodiment of the present application provides an electrochemical device, comprising a housing, a first battery cell assembly, and at least one first structural member, wherein the housing comprises a first space, and at least a portion of the first battery cell assembly is disposed within the first space. The first battery cell assembly comprises a plurality of first battery cells, which are stacked along a first direction. The first structural member and the first battery cell assembly are arranged along the first direction, and the first structural member comprises a first bottom plate, two first side plates connected to the first bottom plate, the two first side plates being spaced apart along a second direction, the second direction being perpendicular to the first direction, and the two first side plates being fixedly connected to the housing.

[0006] In the electrochemical device, the first structural member is disposed on one side of the first battery cell assembly along the first direction. The first bottom plate provides expansion space for the first battery cell assembly, which can apply pressure to the first battery cell and extend the life of the first battery cell assembly.

[0007] In some embodiments of the present application, the housing includes a first wall, a second wall, a third wall, and a fourth wall, wherein the first wall and the second wall are spaced apart along a second direction, and the third wall and the fourth wall are spaced apart along a third direction, the third direction being perpendicular to both the first and second directions; one of the two first side panels is fixedly connected to the first wall, and the other of the two first side panels is fixedly connected to the second wall, and / or one of the two first side panels is fixedly connected to the third wall, and the other of the two first side panels is fixedly connected to the fourth wall. The first structural member is fixedly connected to the housing via the two first side panels, and when the first battery cell assembly expands, the first battery cell assembly squeezes the first bottom plate, causing the first bottom plate to deform, and the first bottom plate applies pressure to the first battery cell assembly.

[0008] In some embodiments of the present application, the shell further includes a fifth wall. Along the first direction, the fifth wall is arranged on a side of the first structural member away from the first battery cell assembly, which is beneficial to improving the stability of the first structural member connected to the shell.

[0009] In some embodiments of the present application, the electrochemical device includes two first structural members, and the housing further includes a sixth wall. The sixth wall and the fifth wall are spaced apart along a first direction. Along the first direction, the fifth wall is located on a side of one of the first structural members that is distal to the first battery cell assembly, and the sixth wall is located on a side of the other first structural member that is distal to the first battery cell assembly. The two first structural members can cooperate to apply pressure to the first battery cell assembly, further extending the life of the first battery cell assembly.

[0010] In some embodiments of the present application, one of the two first side panels is fixedly connected to the first wall and the fifth wall, and the other first side panel is fixedly connected to the second wall and the fifth wall, which helps to improve the stability of the first structural member connected to the shell.

[0011] In some embodiments of the present application, a first distance d1 is present between the edges of the first bottom plate and the first side plate along the first direction. When the first bottom plate deforms along the first direction, the first distance d1 can provide deformation space, thereby reducing the impact of the deformation of the first bottom plate on the housing and the outer shape of the electrochemical device.

[0012] In some embodiments of the present application, the number of first structural members is one, and d1 ≥ n * d0 * 16%, where n is the number of first battery cells in the first battery cell assembly, and d0 is the length of each first battery cell along the first direction. When all first battery cells in the first battery cell assembly expand by an average of no more than 16%, the first battery cell assembly compresses the first bottom plate along the first direction, causing the deformation of the first bottom plate to exceed the first distance d1. This reduces the impact of the deformation of the first bottom plate on the housing and the outer shape of the electrochemical device.

[0013] In some embodiments of the present application, there are two first structural members, each disposed on either side of the first battery cell assembly along a first direction and connected to the housing, and d1 ≥ n*d0*8%. When all first battery cells in the first battery cell assembly expand by an average of no more than 16%, the first battery cell assembly compresses the first bottom plates on either side along the first direction, causing the deformation of the two first bottom plates to not exceed a first distance d1. This reduces the impact of the deformation of the first bottom plates on the housing and, consequently, the outer shape of the electrochemical device.

[0014] In some embodiments of the present application, the first structural member further includes two first protrusions provided on the first bottom plate, the two first protrusions being located between the two first side plates and spaced apart along the second direction. The two first protrusions can partially absorb the pulling force generated by deformation of the first bottom plate, thereby reducing the impact of deformation of the first bottom plate on the two first side plates, and further enhancing the structural rigidity of the first bottom plate, improving the first bottom plate's ability to resist deformation.

[0015] In some embodiments of the present application, the first structural member further includes a first through hole and a second through hole provided in the first base plate, wherein the first through hole and the second through hole are located between the two first protrusions. The first through hole and the second through hole are conducive to weakening the structural rigidity of the first base plate and facilitating expansion of the first battery cell assembly.

[0016] In some embodiments of the present application, the first battery cell includes a first battery cell shell, a first electrode assembly, and a first electrode terminal connected to the first electrode assembly and extending from the first battery cell shell; along the first direction, the projections of the first electrode assembly and the two first protrusions are separated, which is conducive to promoting uniform expansion of the first battery cell assembly.

[0017] In some embodiments of the present application, the first battery cell includes a first battery cell shell, a first electrode assembly, and a first electrode terminal connected to the first electrode assembly and extending from the first battery cell shell; along the first direction, the projection of the first electrode assembly and the projection of the first through hole are separated, and the projection of the first electrode assembly and the projection of the second through hole are separated, which is conducive to promoting uniform expansion of the first battery cell assembly.

[0018] In some embodiments of the present application, the first battery cell includes a first battery cell shell, a first electrode assembly, and a first electrode terminal connected to the first electrode assembly and extending from the first battery cell shell; the electrochemical device also includes a first insulating member, the first insulating member being bonded to at least a portion of the first battery cell shell and at least a portion of the first electrode terminal extending outside the first battery cell shell. The first insulating member covers a portion of the surface of the first electrode terminal and a portion of the surface of the third electrode terminal, and can provide support and protection, reducing the risk of damage to the first electrode terminal and the third electrode terminal. It can also provide insulation, reducing the risk of short circuits between adjacent electrode terminals. The provision of the first insulating member helps reduce the amount of filler in the first electrode terminal and third electrode terminal areas, saving the cost of the electrochemical device. The first insulating member covers at least a portion of the surface of the first shell, which helps protect the first shell and reduces the risk of damage to the first shell by foreign objects.

[0019] In some embodiments of the present application, in the first direction, the projection of the first electrode assembly is separated from the projection of the first insulating member, which is beneficial to improving the uniform expansion of the first electrode assembly and reducing the impact of the expansion of the first electrode assembly on the first electrode terminal and the third electrode terminal.

[0020] In some embodiments of the present application, in the first direction, the projection of the first insulating member is located within the projection of the first base plate. When the first battery cell assembly expands, the first base plate applies pressure to the first insulating member and the first shell, which helps to reduce the effect of the deformation of the first shell on the pulling of the first insulating member, and reduce the effect of the deformation of the first shell pulling the first insulating member on the first electrode terminal and the third electrode terminal.

[0021] In some embodiments of the present application, the first structural member further includes two second side panels connected to the first base plate, the two second side panels being spaced apart along a third direction that is perpendicular to both the first and second directions. The second side panels are advantageously used to enhance the structural rigidity of the first base plate and improve its ability to resist deformation.

[0022] In some embodiments of the present application, the two first side panels and the two second side panels are projected apart along the first direction. When the first structural member deforms excessively, causing damage to either the first or second side panels, the damaged side panel is separated from the other side panels, thereby reducing the impact on the other side panels.

[0023] In some embodiments of the present application, a third through hole is provided at the connection between the second side plate and the first bottom plate, which is beneficial to weakening the structural rigidity of the first bottom plate and improving the uniform expansion of the first battery cell assembly.

[0024] In some embodiments of the present application, the first structural member also includes two first protrusions provided on the first bottom plate, the two first protrusions are located between the two first side plates and are spaced apart along the second direction; the first structural member has a first area, the first area is located between the two first protrusions; a third through hole is provided at the connection between the second side plate and the first bottom plate, and the projection of the third through hole is separated from the projection of the first area, which is conducive to promoting the uniform expansion of the first battery cell assembly.

[0025] In some embodiments of the present application, the electrochemical device also includes a second battery cell assembly, at least a portion of which is located in the first space and arranged along the second direction with the first battery cell assembly, the second battery cell assembly includes a plurality of second battery cells, and the plurality of second battery cells are stacked along the first direction; along the first direction, the first structural member and the second battery cell assembly are arranged.

[0026] In some embodiments of the present application, the first structural member also includes two first protrusions provided on the first bottom plate, the two first protrusions are located between the two first side plates and are spaced apart along the second direction; the second battery cell includes a second battery cell shell, a second electrode assembly, and a second electrode terminal connected to the second electrode assembly and extending from the second battery cell shell; along the first direction, the projections of the second electrode assembly and the two first protrusions are separated, which is conducive to promoting uniform expansion of the second battery cell assembly 6.

[0027] In some embodiments of the present application, the first structural member also includes a first through hole and a second through hole provided on the first base plate, and the first through hole and the second through hole are located between the two first protrusions; along the first direction, the projection of the second electrode assembly and the projection of the first through hole are separated, and the projection of the second electrode assembly and the projection of the second through hole are separated, which is conducive to promoting the uniform expansion of the second battery cell assembly.

[0028] In some embodiments of the present application, the second battery cell includes a second battery cell shell, a second electrode assembly, and a second electrode terminal connected to the second electrode assembly and extending from the second battery cell shell; the electrochemical device also includes a second insulating member, which covers at least a portion of the second battery cell shell and at least a portion of the second electrode terminal. The second insulating member covers a portion of the surface of the second electrode terminal and a portion of the surface of the fourth electrode terminal, and can play a supporting and protective role, reducing the risk of damage to the second electrode terminal and the fourth electrode terminal. It can also play an insulating role, reducing the risk of short circuits between adjacent electrode terminals. The provision of the second insulating member is conducive to reducing the amount of filler for the second electrode terminal and the fourth electrode terminal area, saving the cost of the electrochemical device. The second insulating member covers at least a portion of the surface of the second shell, which is conducive to protecting the second shell and reducing the risk of damage to the second shell by foreign objects.

[0029] In some embodiments of the present application, in the first direction, the projection of the second electrode assembly is separated from the projection of the second insulating member, which is beneficial to improving the uniform expansion of the second electrode assembly and reducing the impact of the expansion of the second electrode assembly on the second electrode terminal and the fourth electrode terminal.

[0030] In some embodiments of the present application, in the first direction, the projection of the second insulating member overlaps with the projection of the first base plate. When the second battery cell assembly expands, the first base plate applies pressure to the second insulating member and the second shell, which helps to reduce the effect of the deformation of the second shell on the pulling of the second insulating member, and reduce the effect of the deformation of the second shell pulling the second insulating member on the second electrode terminal and the fourth electrode terminal.

[0031] In some embodiments of the present application, the first structural member also includes a second protrusion, which is provided on the first bottom plate and located between the two first side plates. The second protrusion is beneficial to enhancing the structural rigidity of the first bottom plate and improving the ability of the first bottom plate to resist deformation.

[0032] In some embodiments of the present application, the first structural member has a first area and a second area, the first area is located between the second protrusion and one first side plate, and the second area is located between the second protrusion and the other first side plate.

[0033] In some embodiments of the present application, in the first direction X, the projection of the first region at least partially overlaps with the projection of the first electrode assembly, which is beneficial to promoting uniform expansion of the first battery cell assembly.

[0034] In some embodiments of the present application, in the first direction X, the projection of the second region at least partially overlaps with the projection of the second electrode assembly, which is beneficial to promoting uniform expansion of the second battery cell assembly.

[0035] In some embodiments of the present application, the first structural member is further provided with a fourth through hole and a fifth through hole, wherein the fourth through hole is provided in the first region and the fifth through hole is provided in the second region. The fourth through hole and the fifth through hole are conducive to weakening the structural rigidity of the first base plate and reducing the first base plate's ability to resist deformation.

[0036] In some embodiments of the present application, the electrochemical device further includes a first elastic member disposed between the first base plate and the first battery cell assembly, connecting the first base plate and the first battery cell assembly. The first elastic member can provide protection, reducing the wear and tear of the first base plate on the adjacent first battery cell. Furthermore, the first elastic member can also function as an elastic buffer, cooperating with the first base plate to provide pressure to the first battery cell assembly when the first battery cell assembly expands and deforms.

[0037] In some embodiments of the present application, along the first direction, at least two adjacent battery cells among the plurality of first battery cells are arranged in contact with each other.

[0038] An embodiment of the present application further provides an electrical device comprising the electrochemical device described in any one of the above embodiments.

[0039] In the above-mentioned electrical equipment, the electrochemical device applies pressure to the battery cell by providing the first structural member, thereby increasing the service life of the electrochemical device and reducing the impact of the service life of the electrochemical device on the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a schematic diagram of the three-dimensional structure of an electrochemical device in one embodiment of the present application.

[0041] FIG. 2 is an exploded view of the electrochemical device shown in FIG. 1 .

[0042] FIG3 is a schematic diagram of the internal structure of the electrochemical device shown in FIG1 .

[0043] FIG4 is a schematic diagram of the three-dimensional structure of an expanded embodiment of the electrochemical device shown in FIG1 .

[0044] FIG. 5 is an exploded view of the electrochemical device shown in FIG. 4 .

[0045] FIG6 is a schematic structural diagram of a first structural member in an embodiment of the present application.

[0046] FIG7 is a cross-sectional view of the first structural member in the third direction in one embodiment of the present application.

[0047] FIG8 is a schematic structural diagram of a first battery cell in an embodiment of the present application.

[0048] FIG9 is a schematic structural diagram of a first battery cell before packaging in an embodiment of the present application.

[0049] FIG10 is a schematic structural diagram of a portion of the electrochemical device along a first direction in one embodiment of the present application.

[0050] FIG. 11 is a schematic diagram of the three-dimensional structure of an expanded embodiment of the electrochemical device shown in FIG. 1 .

[0051] FIG. 12 is an exploded view of the electrochemical device shown in FIG. 11 .

[0052] FIG13 is a schematic diagram of the internal structure of the electrochemical device shown in FIG11 .

[0053] FIG14 is a schematic structural diagram of a second battery cell in an embodiment of the present application.

[0054] FIG15 is a schematic structural diagram of the second battery cell before packaging in one embodiment of the present application.

[0055] FIG16 is a schematic structural diagram of a first structural member in an embodiment of the present application.

[0056] FIG17 is a schematic structural diagram of a portion of the electrochemical device along a first direction in one embodiment of the present application.

[0057] FIG18 is a schematic structural diagram of a first structural member being squeezed and deformed by a first battery cell assembly and a second battery cell assembly in one embodiment of the present application.

[0058] FIG19 is a schematic structural diagram of two first battery cells connected in parallel and connected to a first insulating member in one embodiment of the present application.

[0059] FIG20 is a view of a first battery cell along a first direction in one embodiment of the present application.

[0060] FIG21 is a schematic structural diagram of two parallel second battery cells connected to a second insulating member in one embodiment of the present application.

[0061] FIG22 is a view of the second battery cell along the first direction in one embodiment of the present application.

[0062] FIG23 is a schematic structural diagram of a first battery cell assembly and a second battery cell assembly connected to form a series module in one embodiment of the present application.

[0063] FIG. 24 is a schematic structural diagram of an expanded embodiment of the series module shown in FIG. 23 .

[0064] FIG25 is a schematic diagram of the structure of an electrical device in one embodiment of the present application.

[0065] Description of main component symbols

[0066] Electrochemical device 100

[0067] Housing 10

[0068] First Wall 11

[0069] Second wall 12

[0070] Third wall 13

[0071] Fourth Wall 14

[0072] Third convex portion 141

[0073] Fourth convex part 142

[0074] Fifth convex part 143

[0075] Fifth Wall 15

[0076] Sixth Wall 16

[0077] First Space 17

[0078] First battery cell assembly 20

[0079] First battery cell 21

[0080] First housing 211

[0081] First main body 2111

[0082] First edge sealing part 2112

[0083] First side sealing part 21121

[0084] First top seal part 21122

[0085] Part 1

[0086] Part II

[0087] First electrode terminal 212

[0088] First bending section 2121

[0089] First connecting section 2122

[0090] Third electrode terminal 213

[0091] The third bending section 2131

[0092] The third connecting section 2132

[0093] First electrode assembly 214

[0094] First insulating member 22

[0095] First channel 221

[0096] First structural member 30

[0097] First bottom plate 31

[0098] First area 311

[0099] Second area 312

[0100] First side plate 32

[0101] Second side plate 33

[0102] Second convex portion 34

[0103] first convex portion 35

[0104] The third through hole 361

[0105] Fourth through hole 362

[0106] Fifth through hole 363

[0107] First through hole 364

[0108] Second through hole 365

[0109] Recessed area 37

[0110] First elastic member 41

[0111] The second elastic member 42

[0112] Second battery cell assembly 60

[0113] Second battery cell 61

[0114] Second housing 611

[0115] Second main body 6111

[0116] Second edge sealing part 6112

[0117] Second side seal part 61121

[0118] Second top seal part 61122

[0119] Part III

[0120] Part 4 6114

[0121] Second electrode terminal 612

[0122] Second bending section 6121

[0123] Second connecting section 6122

[0124] Fourth electrode terminal 613

[0125] Fourth bending section 6131

[0126] Fourth connecting segment 6132

[0127] Second electrode assembly 614

[0128] Second insulating member 62

[0129] Second channel 621

[0130] Series module 70

[0131] Total positive electrode terminal 81

[0132] Total negative electrode terminal 82

[0133] First connecting member 83

[0134] Second connecting member 84

[0135] Conductive member 90

[0136] Electrical equipment 200

[0137] First direction X

[0138] Second direction Y

[0139] The third direction Z

[0140] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0141] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0142] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally located element. When an element is considered to be "disposed on" another element, it may be directly disposed on the other element or there may be a centrally located element. Terms such as "bottom" and "side" are used to explain the specification and do not limit this application.

[0143] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0144] In existing electrochemical devices, battery cells expand during use. It is necessary to apply pressure to the battery cells when they expand in order to increase the service life of the electrochemical devices.

[0145] An embodiment of the present application provides an electrochemical device, comprising a housing, a first battery cell assembly, and at least one first structural member, wherein the housing comprises a first space, and at least a portion of the first battery cell assembly is disposed within the first space. The first battery cell assembly comprises a plurality of first battery cells, which are stacked along a first direction. The first structural member and the first battery cell assembly are arranged along the first direction, and the first structural member comprises a first bottom plate, two first side plates connected to the first bottom plate, the two first side plates being spaced apart along a second direction, the second direction being perpendicular to the first direction, and the two first side plates being fixedly connected to the housing.

[0146] In the electrochemical device, the first structural member is disposed on one side of the first battery cell assembly along the first direction. The first bottom plate provides expansion space for the first battery cell assembly, which can apply pressure to the first battery cell and extend the life of the first battery cell assembly.

[0147] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0148] As shown in Figures 1, 2, and 3, an embodiment of the present application provides an electrochemical device 100, comprising a housing 10, a first battery cell assembly 20, and at least one first structural member 30. The housing 10 includes a first space 17, with at least a portion of the first battery cell assembly 20 disposed within the first space 17. The first battery cell assembly 20 includes a plurality of first battery cells 21 stacked along a first direction X. The first structural member 30 is arranged along the first direction X along the first direction X. The first structural member 30 includes a first bottom plate 31 and two first side plates 32 spaced apart along a second direction Y. The first bottom plate 31 is disposed between and connects the two first side plates 32, and the two first side plates 32 are fixedly connected to the housing 10. The second direction Y is perpendicular to the first direction X. The first bottom plate 31 is connected to the first battery cell assembly 20 and is capable of deforming in the first direction X away from the first battery cell assembly 20. The first bottom plate 31 provides expansion space for the first battery cell assembly 20 , and can apply pressure to the first battery cell 21 , thereby increasing the life of the first battery cell assembly 20 .

[0149] In one embodiment, the housing 10 includes a first wall 11, a second wall 12, a third wall 13, and a fourth wall 14. The first wall 11 and the second wall 12 are spaced apart along a second direction Y. The third wall 13 and the fourth wall 14 are spaced apart along a third direction Z that is perpendicular to the first direction X and the second direction Y. The third wall 13 and the fourth wall 14 both connect the first wall 11 and the second wall 12. In one embodiment, the first wall 11, the second wall 12, the third wall 13, and the fourth wall 14 form a first space 17.

[0150] In one embodiment, one of the two first side panels 32 is fixedly connected to the first wall 11, and the other of the two first side panels 32 is fixedly connected to the second wall 12. Optionally, the first side panel 32 and the first wall 11 are fixedly connected by fasteners, such as screws. Optionally, the first side panel 32 and the second wall 12 are fixedly connected by fasteners, such as screws. When the first battery cell assembly 20 expands, the first battery cell assembly 20 squeezes the first bottom plate 31, causing the first bottom plate 31 to deform, and the first bottom plate 31 applies pressure to the first battery cell assembly 20.

[0151] In one embodiment, one of the two first side panels 32 is fixedly connected to the third wall 13, and the other of the two first side panels 32 is fixedly connected to the fourth wall 14. Optionally, the first side panel 32 and the third wall 13 are fixedly connected by fasteners, such as screws. Optionally, the first side panel 32 and the fourth wall 14 are fixedly connected by fasteners, such as screws. When the first battery cell assembly 20 expands, the first battery cell assembly 20 squeezes the first bottom plate 31, causing the first bottom plate 31 to deform, and the first bottom plate 31 applies pressure to the first battery cell assembly 20.

[0152] In one embodiment, the electrochemical device 100 includes two first structural members 30 , which are disposed on either side of the first battery cell assembly 20 along a first direction X and are connected to the first battery cell assembly 20 and the housing 10 . The two first structural members 30 can cooperate to apply pressure to the first battery cell assembly 20 , further extending the life of the first battery cell assembly 20 .

[0153] As shown in Figures 4 and 5, in one embodiment, the shell 10 also includes a fifth wall 15. Along the first direction X, the fifth wall 15 is arranged on a side of a first structural member 30 away from the first battery cell assembly 20, and the fifth wall connects the first wall 11, the second wall 12, the third wall 13 and the fourth wall 14.

[0154] In one embodiment, the shell 10 also includes a sixth wall 16. Along the first direction X, the fifth wall 15 and the sixth wall 16 are spaced apart. The fifth wall 15 and the sixth wall 16 are respectively arranged on both sides of the first battery cell assembly 20. The fifth wall 15 is arranged on the side of a first structural member 30 away from the first battery cell assembly 20, and the sixth wall 16 is arranged on the side of another first structural member 30 away from the first battery cell assembly 20. The fifth wall 15 and the sixth wall 16 are both connected to the first wall 11, the second wall 12, the third wall 13 and the fourth wall 14.

[0155] In one embodiment, within the same first structural member 30, one first side panel 32 is fixedly connected to the first wall 11 and the fifth wall 15, and the other first side panel 32 is fixedly connected to the second wall 12 and the fifth wall 15. Optionally, the first side panel 32 is fixedly connected to the first wall 11 and the fifth wall 15 by fasteners, such as screws. Optionally, the first side panel 32 is fixedly connected to the second wall 12 and the fifth wall 15 by fasteners, such as screws.

[0156] In one embodiment, within the same first structural member 30, one first side panel 32 is fixedly connected to the first wall 11 and the sixth wall 16, and the other first side panel 32 is fixedly connected to the second wall 12 and the sixth wall 16. Optionally, the first side panel 32 is fixedly connected to the first wall 11 and the sixth wall 16 by fasteners, such as screws. Optionally, the first side panel 32 is fixedly connected to the second wall 12 and the sixth wall 16 by fasteners, such as screws.

[0157] As shown in FIG. 2 , FIG. 3 , FIG. 6 and FIG. 7 , in one embodiment, when viewed from the third direction Z, in the same first structural member 30 , the two first side plates 32 are located on a side of the first bottom plate 31 facing away from the first battery cell assembly 20 .

[0158] The two first side plates 32 of the same first structural member 30 are located on the side of the first bottom plate 31 facing away from the first battery cell assembly 20, so that the first bottom plate 31 and the two first side plates 32 form a recessed area 37 with an opening facing away from the first battery cell assembly 20. The recessed area 37 provides deformation space for the first battery cell assembly 20 while reducing the influence of the deformation of the first bottom plate 31 on the outer shape of the electrochemical device 100.

[0159] In one embodiment, the first side plate 32 extends along the first direction X when viewed along the third direction Z, and the first side plate 32 is perpendicular to the first bottom plate 31. In one embodiment, the first side plate 32 is angled with the first bottom plate 31 when viewed along the third direction Z.

[0160] In one embodiment, in the first direction X, part of the first side plate 32 is located on the side of the first bottom plate 31 away from the first battery cell assembly 20 , and part of the first side plate 32 is located on the side of the first bottom plate 31 close to the first battery cell assembly 20 (not shown).

[0161] In one embodiment, the first structural member 30 is a sheet metal member, which is integrally manufactured by a sheet metal bending process. In one embodiment, the first bottom plate 31 and the first side plate 32 are welded to form the first structural member 30 .

[0162] In one embodiment, along the second direction Y, the two first side plates 32 are symmetrically connected to two ends of the first bottom plate 31 .

[0163] In one embodiment, a first distance d1 exists between the edges of the first bottom plate 31 and the first side plate 32 along the first direction X. When the first bottom plate 31 deforms along the first direction X, the first distance d1 helps reduce the impact of the deformation of the first bottom plate 31 on the housing 10 and the outer shape of the electrochemical device 100. In this application, the first distance d1 refers to the distance along the first direction X between a side surface of the first bottom plate 31 facing away from the first battery cell assembly 20 and an end of the first side plate 32 facing away from the first battery cell assembly 20 within the same first structural member 30.

[0164] In one embodiment, the number of the first structural member 30 in the electrochemical device 100 is one, and d1 ≥ n*d0*16%, where n is the number of first battery cells 21 in the first battery cell assembly 20, and d0 is the length of each first battery cell 21 along the first direction X. When the lengths of all the first batteries 21 in the first battery cell assembly 20 in the first direction X expand by no more than 16%, the first battery cell assembly 20 compresses the first bottom plate 31 along the first direction X, so that the deformation of the first bottom plate 31 does not exceed the first distance d1. This can reduce the impact of the deformation of the first bottom plate 31 on the housing 10 and the outer shape of the electrochemical device 100.

[0165] In one embodiment, the electrochemical device 100 includes two first structural members 30, and d1 ≥ n*d0*8%. When all first battery cells 21 in the first battery cell assembly 20 expand by no more than 16% in length in the first direction X, the first battery cell assembly 20 compresses the first bottom plates 31 on both sides along the first direction X, so that the deformation of the two first bottom plates 31 does not exceed the first distance d1. This reduces the impact of the deformation of the first bottom plates 31 on the housing 10 and the outer shape of the electrochemical device 100.

[0166] In one embodiment, the first structural member 30 further includes two second side panels 33 connected to the first base plate 31. The two second side panels 33 are spaced apart along the third direction Z. The second side panels 33 help enhance the structural rigidity of the first base plate 31, improve the first base plate 31's ability to resist deformation, and improve the first base plate 31's ability to resist expansion of the first battery cell assembly 20. In one embodiment, both second side panels 33 extend along the second direction Y. In one embodiment, the two second side panels 33 are respectively disposed at both ends of the first base plate 31 along the third direction Z.

[0167] In one embodiment, the second side plate 33 is located on a side of the first base plate 31 facing away from the first battery cell assembly 20. In one embodiment, in the first direction X, a portion of the second side plate 33 is located on a side of the first base plate 31 facing away from the first battery cell assembly 20, and a portion of the second side plate 33 is located on a side of the first base plate 31 closer to the first battery cell assembly 20. In one embodiment, the first base plate 31, the two second side plates 33, and the two first side plates 32 form a recessed area 37 with an opening facing away from the first battery cell assembly 20.

[0168] In one embodiment, the first structural member 30 is formed into the second side plate 33 by a sheet metal process. In one embodiment, the second side plate 33 is connected to the first bottom plate 31 by welding.

[0169] In one embodiment, one of the two second side plates 33 is connected to the third wall 13, and the other of the two second side plates 33 is connected to the fourth wall 14, which is beneficial to enhancing the stability of the connection between the first structural member 30 and the shell 10, improving the vibration resistance of the electrochemical device 100, and further improving the ability of the first bottom plate 31 to resist deformation.

[0170] In one embodiment, in the first direction X, the length by which the second side panel 33 extends from the first bottom panel 31 is equal to the length by which the first side panel 32 extends from the first bottom panel 31. In one embodiment, in the first direction X, the length by which the second side panel 33 extends from the first bottom panel 31 is greater than the length by which the first side panel 32 extends from the first bottom panel 31. In one embodiment, in the first direction X, the length by which the second side panel 33 extends from the first bottom panel 31 is less than the length by which the first side panel 32 extends from the first bottom panel 31.

[0171] In one embodiment, the first side panel 32 and the second side panel 33 are separated when viewed in the first direction X. In one embodiment, the projections of the two first side panels 32 and the projections of the two second side panels 33 are separated along the first direction X. If excessive deformation of the first structural member 30 causes damage to either the first side panel 32 or the second side panel 33, the damaged side panel is separated from the other side panels, thereby reducing the impact on the other side panels.

[0172] In one embodiment, when the first battery cell assembly 20 has not expanded, the first structural member 30 has applied pressure to the first battery cell assembly 20 , which is beneficial to improving the stability of the first battery cell assembly 20 connected to the housing 10 and improving the vibration resistance of the electrochemical device 100 .

[0173] In one embodiment, when the first battery cell assembly 20 does not expand, the first structural member 30 is connected to the first battery cell assembly 20 in the first direction X, and the first structural member 30 does not apply pressure to the first battery cell assembly 20 .

[0174] In one embodiment, the electrochemical device 100 further includes a first elastic member 41, which is disposed between the first base plate 31 and the first battery cell assembly 20, connecting the first base plate 31 and the first battery cell assembly 20. The first elastic member 41 provides protection, reducing the impact of the first base plate 31 on the adjacent first battery cell 21. Furthermore, the first elastic member 41 also acts as an elastic buffer, cooperating with the first base plate 31 to apply pressure to the first battery cell assembly 20 when the first battery cell assembly 20 expands and deforms. Optionally, the first elastic member 41 is foam.

[0175] In one embodiment, any two adjacent first battery cells 21 in the first battery cell assembly 20 are arranged in contact along the first direction X. In one embodiment, at least two adjacent first battery cells 21 in the first battery cell assembly 20 are arranged in contact along the first direction X. In one embodiment, the electrochemical device 100 further includes a first filler (not shown) disposed between two adjacent first battery cells 21 along the first direction X, and contacting and connecting the two first battery cells 21. The first filler is elastically deformable. It not only provides a buffering and protective function, reducing the impact of mutual impact between the two adjacent first battery cells 21 when the electrochemical device 100 is shaken, but also absorbs the expansion and squeezing force of the first battery cells 21, reducing the impact of the expansion of the first battery cells 21 on the appearance of the first battery cell assembly 20. Optionally, there are multiple first fillers, with a first filler provided between some adjacent first battery cells 21 and some adjacent first battery cells 21 directly contacting each other. Optionally, the first filler comprises any one of foam, a spring, an airbag, and a sheet metal component.

[0176] As shown in Figures 8 and 9, in one embodiment, the first battery cell 21 is a soft-pack battery cell. In other embodiments, the first battery cell 21 may also be a hard-shell battery cell (not shown).

[0177] For ease of understanding and description, the battery cells described in this application are further explained using soft-pack battery cells as an example.

[0178] The first battery cell 21 includes a first shell 211, a first electrode assembly 214, a first electrode terminal 212 and a third electrode terminal 213. The first electrode assembly 214 is disposed inside the first shell 211. The first electrode terminal 212 and the third electrode terminal 213 are both connected to the first electrode assembly 214 and extend out of the first shell 211.

[0179] One of the first electrode terminal 212 and the third electrode terminal 213 is a positive electrode terminal, and the other is a negative electrode terminal.

[0180] The first electrode assembly 214 includes a positive electrode sheet, a negative electrode sheet and a separator (not shown in the figure). The separator is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet are wound or stacked to form the first electrode assembly 214. One of the first electrode terminal 212 and the third electrode terminal 213 is connected to the positive electrode sheet, and the other is connected to the negative electrode sheet.

[0181] In one embodiment, the first housing 211 includes a first portion 2113 and a second portion 2114 that are connected to each other. After the first portion 2113 and the second portion 2114 are connected, an internal space capable of accommodating the first electrode assembly 214 is formed.

[0182] In one embodiment, the first housing 211 includes a first main body 2111 and a first edge seal 2112. The first edge seal 2112 is connected to and extends from the first main body 2111. The first electrode assembly 214 is disposed within the first main body 2111. The first electrode terminal 212 and the third electrode terminal 213 extend from the first edge seal 2112. In one embodiment, the first edge seal 2112 includes a first side seal 21121 and a first top seal 21122 that are connected to each other. The first electrode terminal 212 and the third electrode terminal 213 extend from the first top seal 21122. The first top seal 21122 is located at an end of the first housing 211 along the second direction Y, and the first side seal 21121 is located at an end of the first housing 211 along the third direction Z.

[0183] In one embodiment, the first electrode terminal 212 and the third electrode terminal 213 are respectively located at opposite ends of the first main body 2111 along the second direction Y. There are two first top seal portions 21122, each located on opposite sides of the first main body 2111 along the second direction Y. Each first top seal portion 21122 is connected to two first side seal portions 21121. The first electrode terminal 212 extends from one first top seal portion 21122, and the third electrode terminal 213 extends from the other first top seal portion 21122. In other embodiments, the first electrode terminal 212 and the third electrode terminal 213 are located on the same side of the first main body 2111 along the second direction Y (not shown).

[0184] As shown in Figures 2, 3, and 10, in one embodiment, in the first direction X, the projection of the first shell 211 at least partially overlaps with the projection of the first bottom plate 31. When the first battery cell assembly 20 expands and deforms, the first shell 211 adjacent to the first structural member 30 can act on the first bottom plate 31. At the same time, the first bottom plate 31 can provide pressure for the first shell 211, which helps extend the service life of the first battery cell assembly 20. Optionally, in the first direction X, the projection of the first shell 211 is located within the projection of the first bottom plate 31.

[0185] In one embodiment, the first structural member 30 further includes two first protrusions 35 connected to the first base plate 31. The two first protrusions 35 are located between the two first side plates 32 and spaced apart along the second direction Y. The two first protrusions 35 can partially absorb the tensile force generated by the deformation of the first base plate 31, thereby reducing the impact of the deformation of the first base plate 31 on the two first side plates 32. They also help to enhance the structural rigidity of the first base plate 31 and improve its ability to resist deformation. Optionally, one first protrusion 35 is located closer to one first side plate 32, and the other first protrusion 35 is located closer to the other first side plate 32.

[0186] In one embodiment, along the first direction X, the projection of the first electrode assembly 214 is separated from the projections of the two first protrusions 35 , which helps to reduce the impact on the expansion of the first battery cell assembly 20 .

[0187] In one embodiment, the first structural member 30 further includes a first through hole 364 and a second through hole 365 provided in the first base plate 31. In one embodiment, along the first direction X, the projection of the first electrode assembly 214 is separated from the projection of the first through hole 364, which helps reduce the impact on the expansion of the first battery cell assembly 20. In one embodiment, along the first direction X, the projection of the first electrode assembly 214 is separated from the projection of the second through hole 365, which helps reduce the impact on the expansion of the first battery cell assembly 20.

[0188] In one embodiment, the first through hole 364 and the second through hole 365 are located between the two first protrusions 35 , with the first through hole 364 being close to one of the first protrusions 35 and the second through hole 365 being close to the other first protrusion 35 .

[0189] In one embodiment, there are multiple first through holes 364, and the multiple first through holes 364 are spaced apart along the third direction Z. Optionally, there are two first through holes 364. In one embodiment, there is one first through hole 364 (not shown), and the one first through hole 364 extends along the third direction Z.

[0190] In one embodiment, there are multiple second through holes 365, and the multiple second through holes 365 are spaced apart along the third direction Z. Optionally, there are two second through holes 365. In one embodiment, there is one second through hole 365 (not shown), and the one second through hole 365 extends along the third direction Z.

[0191] In one embodiment, along the first direction X, the projection of the first electrode assembly 214 is separated from the projection of the first through hole 364 , which helps to reduce the impact on the expansion of the first battery cell assembly 20 .

[0192] In one embodiment, along the first direction X, the projection of the first electrode assembly 214 is separated from the projection of the second through hole 365 , which helps to reduce the impact on the expansion of the first battery cell assembly 20 .

[0193] In one embodiment, a plurality of third through holes 361 are provided at the connection between the second side plate 33 and the first bottom plate 31. The plurality of third through holes 361 are spaced apart along the second direction Y. Providing the third through holes 361 at the connection between the second side plate 33 and the first bottom plate 31 helps to weaken the structural rigidity of the first bottom plate 31 and reduce the impact on the uniform expansion of the first battery cell assembly 20.

[0194] As shown in Figures 11, 12 and 13, in one embodiment, the electrochemical device 100 further includes a second battery cell assembly 60, at least a portion of which is disposed in the first space 17 and arranged along the second direction Y with the first battery cell assembly 20, and the second battery cell assembly 60 includes a plurality of second battery cells 61, and the plurality of second battery cells 61 are stacked along the first direction X.

[0195] In one embodiment, along the first direction X, the second battery cell assembly 60 and the first battery cell assembly 20 are located on the same side of the first structural member 30 and are connected to the first structural member 30. In one embodiment, along the first direction X, the second battery cell assembly 60 is located between the two first structural members 30, and the two ends of the second battery cell assembly 60 are respectively connected to the first bottom plates 31 of the two first structural members 30. The first bottom plates 31 provide expansion space for the second battery cell assembly 60, apply pressure to the second battery cells, and extend the life of the first battery cell assembly 20.

[0196] In one embodiment, the electrochemical device further includes a second elastic member 42, which is disposed between the first base plate 31 and the second battery cell assembly 60, connecting the first base plate 31 and the second battery cell assembly 60. The second elastic member 42 provides protection, reducing the impact of the first base plate 31 on the adjacent second battery cell 61. Furthermore, the second elastic member 42 acts as an elastic buffer, cooperating with the first base plate 31 to apply pressure to the second battery cell assembly 60 when the second battery cell assembly 60 expands and deforms. Optionally, the second elastic member 42 is foam.

[0197] In one embodiment, any two adjacent second battery cells 61 in the second battery cell assembly 60 are arranged in contact along the first direction X. In one embodiment, at least two adjacent second battery cells 61 in the second battery cell assembly 60 are arranged in contact along the first direction X. In one embodiment, the electrochemical device 100 further includes a second filler (not shown) disposed between two adjacent second battery cells 61 along the first direction X, and contacting and connecting the two second battery cells 61. The second filler is elastically deformable. The second filler not only serves as a buffer and protects against the impact of the two adjacent second battery cells 61 on each other when the electrochemical device 100 is shaken, but also absorbs the expansion and squeezing force of the second battery cells 61, reducing the impact of the expansion of the second battery cells 61 on the shape of the second battery cell assembly 60. In one embodiment, there are multiple second fillers, with some second fillers being disposed between two adjacent second battery cells 61, and some adjacent second battery cells 61 being directly contacted and connected. Optionally, the second filler comprises any one of foam, a spring, an airbag, and a sheet metal part.

[0198] As shown in Figures 14 and 15, the second battery cell 61 includes a second shell 611, a second electrode assembly 614, a second electrode terminal 612 and a fourth electrode terminal 613. The second electrode assembly 614 is arranged inside the second shell 611, and the second electrode terminal 612 and the fourth electrode terminal 613 are both connected to the second electrode assembly 614 and extend out of the second shell 611.

[0199] One of the second electrode terminal 612 and the fourth electrode terminal 613 is a positive electrode terminal, and the other of the second electrode terminal 612 and the fourth electrode terminal 613 is a negative electrode terminal.

[0200] The second electrode assembly 614 includes a positive electrode sheet, a negative electrode sheet and a separator (not shown in the figure). The separator is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet are wound or stacked to form the second electrode assembly 614. One of the second electrode terminal 612 and the fourth electrode terminal 613 is connected to the negative electrode sheet, and the other of the second electrode terminal 612 and the fourth electrode terminal 613 is connected to the positive electrode sheet.

[0201] In one embodiment, the second shell 611 includes a third portion 6113 and a fourth portion 6114 that are connected to each other. After the third portion 6113 and the fourth portion 6114 are connected, an internal space capable of accommodating the second electrode assembly 614 can be formed.

[0202] In one embodiment, the second housing 611 includes a second main body 6111 and a second edge seal 6112. The second edge seal 6112 is connected to and extends from the second main body 6111. The second electrode assembly 614 is disposed within the second main body 6111. The second electrode terminal 612 and the fourth electrode terminal 613 extend from the second edge seal 6112. In one embodiment, the second edge seal 6112 includes a second side seal 61121 and a second top seal 61122 connected to each other. The second electrode terminal 612 and the fourth electrode terminal 613 extend from the second top seal 61122. The second top seal 61122 is located at an end of the second housing 611 along the second direction Y, and the second side seal 61121 is located at an end of the second housing 611 along the third direction Z.

[0203] In one embodiment, the second electrode terminal 612 and the fourth electrode terminal 613 are respectively located at opposite ends of the second battery cell 61 along the second direction Y. There are two second top seals 61122, each located on opposite sides of the second main body 6111 along the second direction Y. Each second top seal 61122 is connected to two second side seals 61121. The second electrode terminal 612 extends from one second top seal 61122, and the fourth electrode terminal 613 extends from the other second top seal 61122. In other embodiments, the second electrode terminal 612 and the fourth electrode terminal 613 are located on the same side of the second battery cell 61 along the second direction Y (not shown).

[0204] As an example, the following further describes the case where the second electrode terminal 612 and the fourth electrode terminal 613 are respectively located at two opposite ends of the second battery cell 61 along the second direction Y.

[0205] As shown in Figures 12, 13, 16, and 17, in one embodiment, in the first direction X, the projection of the second housing 611 at least partially overlaps with the projection of the first base plate 31. When the second battery cell assembly 60 expands and deforms, the second housing 611 adjacent to the first structural member 30 acts on the first base plate 31. Simultaneously, the first base plate 31 provides pressure to the adjacent second housing 611, thereby improving the service life of the second battery cell assembly 60. Optionally, in the first direction X, the projection of the second housing 611 lies within the projection of the first base plate 31.

[0206] In one embodiment, along the first direction X, the projection of the second electrode assembly 614 is separated from the projections of the two first protrusions 35 , which helps to reduce the impact on the expansion of the second battery cell assembly 60 .

[0207] In one embodiment, along the first direction X, the projection of the second electrode assembly 614 is separated from the projection of the first through hole 364, which helps to reduce the impact on the expansion of the second battery cell assembly 60. In one embodiment, along the first direction X, the projection of the second electrode assembly 614 is separated from the projection of the second through hole 365, which helps to reduce the impact on the expansion of the second battery cell assembly 60.

[0208] In one embodiment, the first structural member 30 further includes a second protrusion 34 connected to the first base plate 31. The second protrusion 34 is disposed on the first base plate 31, located between the two first side plates 32, and between the two first protrusions 35. The second protrusion 34 helps enhance the structural rigidity of the first base plate 31 and improves the first base plate 31's ability to resist deformation. Optionally, the second protrusion 34 is disposed on a side of the first base plate 31 facing away from the first battery cell assembly 20.

[0209] In one embodiment, the second protrusion 34 is formed on the first bottom plate 31 by a stamping process. In one embodiment, the second protrusion 34 is connected to the first bottom plate 31 by welding.

[0210] In one embodiment, the first base plate 31 has a first region 311 and a second region 312. The first region 311 is located between the second protrusion 34 and one of the first protrusions 35, and the second region 312 is located between the second protrusion 34 and another of the first protrusions 35. In the first direction X, the projection of the first region 311 at least partially overlaps with the projection of the first electrode assembly 214, and the projection of the second region 312 at least partially overlaps with the projection of the second electrode assembly 614.

[0211] In one embodiment, the second protrusion 34 is located in the middle of the first bottom plate 31 along the second direction Y, which helps to make the structural stiffness of the first region 311 and the second region 312 approximately the same, thereby ensuring that the forces exerted by the first structural member 30 on the first battery cell assembly 20 and the second battery cell assembly 60 are approximately the same. Optionally, in the first direction X, the projection of the first electrode assembly 214 is located within the projection of the first region 311, and the projection of the second electrode assembly 614 is located within the projection of the second region 312.

[0212] In one embodiment, the first structural member 30 is further provided with a fourth through hole 362 and a fifth through hole 363. The fourth through hole 362 is provided in the first region 311, and the fifth through hole 363 is provided in the second region 312. The fourth through hole 362 and the fifth through hole 363 help weaken the structural rigidity of the first base plate 31 and reduce the ability of the first base plate 31 to resist deformation. Optionally, the fourth through hole 362 is located near the second protrusion 34. Optionally, the fifth through hole 363 is located near the second protrusion 34.

[0213] Referring to Figures 12, 13, and 18, when the first and second battery cell assemblies 20, 60 expand, they squeeze the first bottom plate 31 along the first direction X, causing the first bottom plate 31 to deform. In one embodiment, the deformed first bottom plate 31 does not extend beyond the edges of the two first side plates 32 along the first direction X, thereby reducing the impact of the deformation of the first bottom plate 31 on the outer shape of the electrochemical device 100.

[0214] As shown in Figures 3, 19 and 20, in one embodiment, the first battery cell assembly 20 also includes a first insulating member 22, which is bonded to at least a portion of the surface of each first battery cell 21. Specifically, the first insulating member 22 is bonded to a portion of the surface of the first electrode terminal 212, a portion of the surface of the third electrode terminal 213 and at least a portion of the surface of the first shell 211.

[0215] The first insulating member 22 covers a portion of the surface of the first electrode terminal 212 and a portion of the surface of the third electrode terminal 213, providing support and protection, reducing the risk of damage to the first and third electrode terminals 212, 213, improving insulation, and reducing the risk of short circuits between adjacent electrode terminals. The provision of the first insulating member 22 also reduces the amount of filler in the areas of the first and third electrode terminals 212, 213, thereby reducing the cost of the electrochemical device 100.

[0216] The first insulating member 22 covers at least a portion of the surface of the first housing 211, thereby protecting the first housing 211 and reducing the risk of damage to the first housing 211. In one embodiment, the first insulating member 22 completely covers the first top seal portion 21122. In one embodiment, the first insulating member 22 covers a portion of the surface of the first main body 2111. In one embodiment, the first insulating member 22 completely covers the surface of the first housing 211.

[0217] In one embodiment, in the first direction X, the projection of the first electrode assembly 214 is separated from the projection of the first insulating member 22 (as shown in FIG. 20 ), which is beneficial to reducing the impact on the expansion of the first electrode assembly 214 and reducing the impact of the expansion of the first electrode assembly 214 on the first electrode terminal 212 and the third electrode terminal 213.

[0218] In one embodiment, in the first direction X, the projection of the first insulating member 22 is located within the projection of the first bottom plate 31. When the first battery cell assembly 20 expands, the first bottom plate 31 applies pressure to the first insulating member 22 and the first shell 211, which helps to reduce the effect of the deformation of the first shell 211 on the pulling of the first insulating member 22, and reduce the effect of the deformation of the first shell 211 on the pulling of the first insulating member 22 on the first electrode terminal 212 and the third electrode terminal 213.

[0219] In one embodiment, the first insulating member 22 is formed by injection molding an insulating material onto a portion of the surface of the first battery cell 21 , which helps to simplify the process of connecting the first insulating member 22 to the first battery cell 21 and save the manufacturing cost of the electrochemical device 100 .

[0220] In one embodiment, the first insulating member 22 is formed on a portion of the surface of the first battery cell 21 by pouring an insulating material, which helps to simplify the process of connecting the first insulating member 22 to the first battery cell 21 and saves the production cost of the electrochemical device 100. For example, pouring potting glue.

[0221] In one embodiment, the first battery cell assembly 20 includes two first battery cells 21 . The two first battery cells 21 are stacked along the first direction X, and the first insulating member 22 covers a portion of the surface of the two first battery cells 21 .

[0222] In other embodiments, the number of the first battery cells 21 in the first battery cell assembly 20 may also be three, four, five or more (not shown).

[0223] As an example, the following further describes the case where the number of the first battery cells 21 in the first battery cell assembly 20 is two.

[0224] In the first battery cell assembly 20, two first shells 211 are stacked along the first direction X, and the two first battery cells 21 are connected in parallel or in series. In one embodiment, the two first battery cells 21 are connected in series. In one embodiment, the two first battery cells 21 are connected in parallel.

[0225] As an example, the following further describes the connection of two first battery cells 21 in parallel.

[0226] In the first battery cell assembly 20 , the two first electrode terminals 212 are partially exposed from the first insulating member 22 after being connected, and the two third electrode terminals 213 are partially exposed from the first insulating member 22 after being connected.

[0227] In one embodiment, the portion of the first insulating member 22 covering the electrode terminal forms a first channel 221, and the first channel 221 penetrates the first insulating member 22 along the third direction Z. The first channel 221 is conducive to increasing the surface area of ​​the first insulating member 22 and forming a heat dissipation channel for the coolant to pass through, thereby improving the heat dissipation efficiency of the first insulating member 22 and improving the heat dissipation rate of the first battery cell 21.

[0228] As shown in Figures 2 and 3, the electrochemical device 100 includes a plurality of first battery cell assemblies 20. In one embodiment, the plurality of first battery cell assemblies 20 are connected in series. In one embodiment, the plurality of first battery cell assemblies 20 are connected in parallel. In one embodiment, the plurality of first battery cell assemblies 20 are connected in a combination of series and parallel connection.

[0229] As an example, a plurality of first battery cell assemblies 20 connected in series in sequence is taken as an example for further explanation.

[0230] In one embodiment, after multiple first battery cell assemblies 20 are connected in series in sequence, along the first direction X, the two outermost first battery cell assemblies 20 each have an exposed electrode terminal that is not connected to the electrode terminal of the first battery cell assembly 20, forming the total positive electrode terminal 81 and the total negative electrode terminal 82 of the electrochemical device 100.

[0231] The electrochemical device 100 further includes a circuit board (not shown), which is disposed within the housing 10. The circuit board is connected to the first cell assembly 20 via the main positive electrode terminal 81 and the main negative electrode terminal 82. The circuit board is capable of controlling the charging and discharging of the first cell assembly 20. In one embodiment, the circuit board includes a BMS (Battery Management System) assembly, which includes multiple electronic components that enable functions such as data collection, control, protection, communication, power calculation, signal transmission, and power transmission for the cell.

[0232] In one embodiment, the electrochemical device 100 further includes a first connector 83 and a second connector 84. The first connector 83 connects the main positive electrode terminal 81 to the circuit board, and the second connector 84 connects the main negative electrode terminal 82 to the circuit board, thereby connecting the first battery cell assembly 20 to the circuit board. In one embodiment, the first connector 83 is made of at least one of copper, aluminum, nickel, and a nickel alloy. In one embodiment, the second connector 84 is made of at least one of copper, aluminum, nickel, and a nickel alloy.

[0233] In one embodiment, taking two adjacent first battery cell assemblies 20 as an example, the two adjacent first battery cell assemblies 20 are connected in series by connecting the first electrode terminal 212 and the third electrode terminal 213 at the end. In one embodiment, the first electrode terminal 212 and the third electrode terminal 213 are connected by bending toward each other.

[0234] In one embodiment, the electrochemical device 100 further includes a conductive member 90. The first electrode terminal 212 and the third electrode terminal 213 are bent toward each other and are both connected to the conductive member 90. The first electrode terminal 212 and the third electrode terminal 213 are electrically connected by connecting to the conductive member 90. In one embodiment, the first electrode terminal 212 and the third electrode terminal 213 are connected to the conductive member 90 by welding, such as laser welding or ultrasonic welding.

[0235] As shown in Figures 13, 21 and 22, in one embodiment, the second battery cell assembly 60 also includes a second insulating member 62, which is bonded to at least a portion of the surface of each second battery cell 61. Specifically, the second insulating member 62 is bonded to a portion of the surface of the second electrode terminal 612, a portion of the surface of the fourth electrode terminal 613 and at least a portion of the surface of the second shell 611.

[0236] The second insulating member 62 covers a portion of the surface of the second electrode terminal 612 and a portion of the surface of the fourth electrode terminal 613, providing support and protection, reducing the risk of damage to the second and fourth electrode terminals 612 and 613, improving insulation, and reducing the risk of short circuits between adjacent electrode terminals. The provision of the second insulating member 62 also reduces the amount of filler in the areas of the second and fourth electrode terminals 612 and 613, thereby reducing the cost of the electrochemical device 100.

[0237] The second insulating member 62 covers at least a portion of the surface of the second housing 611, thereby protecting the second housing 611 and reducing the risk of damage to the second housing 611. In one embodiment, the second insulating member 62 completely covers the second top seal portion 61122. In one embodiment, the second insulating member 62 covers a portion of the surface of the second main body portion 6111. In one embodiment, the second insulating member 62 completely covers the surface of the second housing 611.

[0238] In one embodiment, in the first direction X, the projection of the second electrode assembly 614 is separated from the projection of the second insulating member 62 (as shown in FIG. 22 ), which is beneficial to reducing the impact on the expansion of the second electrode assembly 614 and reducing the impact of the expansion of the second electrode assembly 614 on the second electrode terminal 612 and the fourth electrode terminal 613.

[0239] In one embodiment, in the first direction X, the projection of the second insulating member 62 is located within the projection of the first bottom plate 31. When the second battery cell assembly 60 expands, the first bottom plate 31 applies pressure to the second insulating member 62 and the second shell 611, which helps to reduce the effect of the deformation of the second shell 611 pulling on the second insulating member 62, and reduce the effect of the deformation of the second shell 611 pulling on the second insulating member 62 on the second electrode terminal 612 and the fourth electrode terminal 613.

[0240] In one embodiment, the second insulating member 62 is formed by injection molding an insulating material onto a portion of the surface of the second battery cell 61 , which simplifies the process of connecting the second insulating member 62 to the second battery cell 61 and reduces the manufacturing cost of the electrochemical device 100 .

[0241] In one embodiment, the second insulating member 62 is formed on a portion of the surface of the second battery cell 61 by pouring an insulating material, which helps to simplify the process of connecting the second insulating member 62 to the second battery cell 61 and save the production cost of the electrochemical device 100. For example, pouring potting glue.

[0242] In one embodiment, the second battery cell assembly 60 includes two second battery cells 61 . The two second battery cells 61 are stacked along the first direction X, and the second insulating member 62 covers a portion of the surface of the two second battery cells 61 .

[0243] In other embodiments, the number of the second battery cells 61 in the second battery cell assembly 60 may also be three, four, five or more (not shown).

[0244] As an example, the following further describes the case where the number of the second battery cells 61 in the second battery cell assembly 60 is two.

[0245] In the second battery cell assembly 60, two second shells 611 are stacked along the first direction X, and the two second battery cells 61 are connected in parallel or in series. In one embodiment, the two second battery cells 61 are connected in series. In one embodiment, the two second battery cells 61 are connected in parallel.

[0246] As an example, the following further describes the connection of two second battery cells 61 in parallel.

[0247] In the second battery cell assembly 60 , the two second electrode terminals 612 are partially exposed from the second insulating member 62 after being connected, and the two fourth electrode terminals 613 are partially exposed from the second insulating member 62 after being connected.

[0248] In one embodiment, the portion of the second insulating member 62 covering the electrode terminal forms a second channel 621, and the second channel 621 penetrates the second insulating member 62 along the third direction Z. The second channel 621 is conducive to increasing the surface area of ​​the second insulating member 62 and forming a heat dissipation channel for the coolant to pass through, thereby improving the heat dissipation efficiency of the second insulating member 62 and improving the heat dissipation rate of the second battery cell 61.

[0249] As shown in Figures 12 and 13, the electrochemical device 100 includes a plurality of second battery cell assemblies 60, and a plurality of first battery cell assemblies 20 are connected to the plurality of second battery cell assemblies 60. In one embodiment, the plurality of first battery cell assemblies 20 and the plurality of second battery cell assemblies 60 are connected in series. In one embodiment, the plurality of first battery cell assemblies 20 and the plurality of second battery cell assemblies 60 are connected in parallel. In one embodiment, the plurality of first battery cell assemblies 20 and the second battery cell assemblies 60 are connected in a combination of series and parallel connection.

[0250] As an example, the following further describes the example of connecting a plurality of first battery cell assemblies 20 and a plurality of second battery cell assemblies 60 in series.

[0251] In one embodiment, the number of first battery cell assemblies 20 is equal to the number of second battery cell assemblies 60, and they correspond one to one along the second direction Y. Optionally, the number of first battery cell assemblies 20 and the number of second battery cell assemblies 60 are both eight. In other embodiments, the number of first battery cell assemblies 20 may also be different from the number of second battery cell assemblies 60 (not shown).

[0252] In one embodiment, along the second direction Y, opposing first cell assemblies 20 and second cell assemblies 60 are connected in series. One first cell assembly 20 and one second cell assembly 60 opposing each other along the second direction Y form a series module 70. The first cell assembly 20 and the second cell assembly 60 constitute eight series modules 70. The eight series modules 70 are stacked sequentially along the first direction X, with two adjacent series modules 70 connected in series. After the eight series modules 70 are sequentially connected in series, along the first direction X, one exposed electrode terminal in each of the first and eighth series modules 70 has not been connected to the electrode terminals of the other series modules 70, forming the total positive electrode terminal 81 and total negative electrode terminal 82 of the electrochemical device 100.

[0253] The circuit board is connected to the first cell assembly 20 and the second cell assembly 60 by connecting the total positive electrode terminal 81 and the total negative electrode terminal 82 , and the circuit board can control the charging and discharging of the first cell assembly 20 and the second cell assembly 60 .

[0254] In one embodiment, taking two adjacent series modules 70 as an example, the two adjacent series modules 70 are connected in series by connecting electrode terminals at their ends. In one embodiment, the two electrode terminals are connected by bending toward each other.

[0255] In one embodiment, the two electrode terminals bent toward each other are connected to the same conductive member 90, and the two electrode terminals are electrically connected by connecting the conductive member 90. In one embodiment, the two electrode terminals are connected to the conductive member 90 by welding, such as laser welding or ultrasonic welding.

[0256] As shown in FIG. 23 , taking a series module 70 as an example, in one embodiment, the polarities of the first electrode terminal 212 and the second electrode terminal 612 are opposite, and the first electrode terminal 212 of the first battery cell assembly 20 is connected to the second electrode terminal 612 of the second battery cell assembly 60 .

[0257] In one embodiment, the first electrode terminal 212 includes a first bent section 2121 and a first connecting section 2122. The first bent section 2121 and the first connecting section 2122 extend from the first insulating member 22. The first bent section 2121 connects the first housing 211 and the first connecting section 2122. The first bent section 2121 is deformable along the first direction X. The first connecting section 2122 is used to connect to another electrode terminal or the conductive member 90. In one embodiment, the first connecting section 2122 is connected to the second electrode terminal 612.

[0258] When the first battery cell assembly 20 and the second battery cell assembly 60 are relatively displaced along the first direction X, the first bent section 2121 is helpful in buffering the pulling force or squeezing force generated by the relative displacement, thereby reducing the influence of the pulling or squeezing generated by the relative displacement of the first battery cell assembly 20 and the second battery cell assembly 60 on the first electrode terminal 212 and the second electrode terminal 612.

[0259] In one embodiment, the first bent section 2121 can also deform along the second direction Y. When the first battery cell assembly 20 and the second battery cell assembly 60 are relatively displaced along the second direction Y, the first bent section 2121 can help buffer the pulling force or squeezing force on the first electrode terminal 212, thereby reducing the effect of the relative displacement between the first battery cell assembly 20 and the second battery cell assembly 60 on the pulling or squeezing of the first electrode terminal 212 and the second electrode terminal 612.

[0260] In one embodiment, the first bending section 2121 is in any one of an N-shape, an S-shape, a V-shape, and a wave shape.

[0261] In one embodiment, the second electrode terminal 612 includes a second bent section 6121 and a second connecting section 6122. The second bent section 6121 and the second connecting section 6122 extend from the second insulating member 62. The second bent section 6121 connects the second housing 611 and the second connecting section 6122. The second bent section 6121 is deformable along the first direction X. The second connecting section 6122 is used to connect to another electrode terminal or the conductive member 90. In one embodiment, the second connecting section 6122 is connected to the first connecting section 2122.

[0262] When the first battery cell assembly 20 and the second battery cell assembly 60 are relatively displaced along the first direction X, the second bent section 6121 helps to buffer the pulling force or squeezing force generated by the relative displacement, thereby reducing the influence of the pulling or squeezing force generated by the relative displacement on the first electrode terminal 212 and the second electrode terminal 612.

[0263] In one embodiment, the second bent section 6121 can also deform along the second direction Y. When the first battery cell assembly 20 and the second battery cell assembly 60 are relatively displaced along the second direction Y, the second bent section 6121 can help buffer the pulling force or squeezing force on the second electrode terminal 612, thereby reducing the effect of the relative displacement between the first battery cell assembly 20 and the second battery cell assembly 60 on the pulling or squeezing of the first electrode terminal 212 and the second electrode terminal 612.

[0264] In one embodiment, the second bending section 6121 is in any one of an N-shape, an S-shape, a V-shape, and a wave shape.

[0265] As shown in FIG. 24 , taking a series module 70 as an example, in one embodiment, the third electrode terminal 213 of the first battery cell assembly 20 is connected to the fourth electrode terminal 613 of the second battery cell assembly 60 .

[0266] In one embodiment, the third electrode terminal 213 includes a third bent section 2131 and a third connecting section 2132. The third bent section 2131 and the third connecting section 2132 extend from the first insulating member 22. The third bent section 2131 connects the first housing 211 and the third connecting section 2132. The third bent section 2131 is deformable along the first direction X. The third connecting section 2132 is used to connect to other electrode terminals or the conductive member 90. In one embodiment, the third connecting section 2132 is connected to the fourth electrode terminal 613.

[0267] When the first battery cell assembly 20 and the second battery cell assembly 60 are relatively displaced along the first direction X, the third bent section 2131 is conducive to buffering the pulling force or squeezing force generated by the relative displacement, thereby reducing the influence of the pulling or squeezing force generated by the relative displacement on the third electrode terminal 213 and the fourth electrode terminal 613.

[0268] In one embodiment, the third bent section 2131 can also deform along the second direction Y. When the first battery cell assembly 20 and the second battery cell assembly 60 are relatively displaced along the second direction Y, the third bent section 2131 helps buffer the pulling force or squeezing force on the third electrode terminal 213, thereby reducing the effect of the relative displacement between the first battery cell assembly 20 and the second battery cell assembly 60 on the pulling or squeezing of the third electrode terminal 213 and the fourth electrode terminal 613.

[0269] In one embodiment, the third bending section 2131 is in any one of an N-shape, an S-shape, a V-shape, and a wave shape.

[0270] In one embodiment, the fourth electrode terminal 613 includes a fourth bent section 6131 and a fourth connecting section 6132. The fourth bent section 6131 and the fourth connecting section 6132 extend from the second insulating member 62. The fourth bent section 6131 connects the second housing 611 and the fourth connecting section 6132. The fourth bent section 6131 is capable of deforming along the first direction X. The fourth connecting section 6132 is used to connect to other electrode terminals or the conductive member 90. In one embodiment, the fourth connecting section 6132 is connected to the third connecting section 2132.

[0271] When the first battery cell assembly 20 and the second battery cell assembly 60 are relatively displaced along the first direction X, the fourth bent section 6131 is conducive to buffering the pulling force or squeezing force generated by the relative displacement, thereby reducing the influence of the pulling or squeezing force generated by the relative displacement on the third electrode terminal 213 and the fourth electrode terminal 613.

[0272] In one embodiment, the fourth bent section 6131 can also deform along the second direction Y. When the first battery cell assembly 20 and the second battery cell assembly 60 are relatively displaced along the second direction Y, the fourth bent section 6131 helps buffer the pulling force or squeezing force on the fourth electrode terminal 613, thereby reducing the effect of the relative displacement between the first battery cell assembly 20 and the second battery cell assembly 60 on the pulling or squeezing of the third electrode terminal 213 and the fourth electrode terminal 613.

[0273] In one embodiment, the fourth bending segment 6131 is in any one of an N-shape, an S-shape, a V-shape, and a wave shape.

[0274] 12 and 13 , a third protrusion 141 is formed on the fourth wall 14 , and the third protrusion 141 extends from the surface of the fourth wall 14 toward the third wall 13 .

[0275] In one embodiment, along the second direction Y, the third protrusion 141 is disposed between the first insulating member 22 and the second insulating member 62 and connects the first insulating member 22 and the second insulating member 62. The third protrusion 141 helps limit the relative displacement of the first battery cell 21 and the second battery cell 61 along the second direction Y, thereby reducing the number of limiting members or fillers for the first battery cell 21 and the second battery cell 61 in the electrochemical device 100, thereby reducing the cost of the electrochemical device 100.

[0276] In one embodiment, there is one third protrusion 141 , which is arranged to extend along the first direction X. In one embodiment, there are multiple third protrusions 141 , which are arranged to be spaced apart along the first direction X.

[0277] In one embodiment, a fourth protrusion 142 is defined on the fourth wall 14 . The fourth protrusion 142 extends from a surface of the fourth wall 14 toward the third wall 13 .

[0278] In one embodiment, along the second direction Y, the fourth protrusion 142 is provided on a side of the first shell 211 facing away from the second shell 611 and is connected to the first insulating member 22 at the end of the first shell 211. The fourth protrusion 142 is conducive to limiting the relative displacement of the first battery cell 21 along the second direction Y. The fourth protrusion 142 cooperates with the third protrusion 141 to limit the displacement of the first battery cell 21 along the second direction Y, thereby reducing the number of limiting members or fillers of the electrochemical device 100 for the first battery cell 21 and reducing the cost of the electrochemical device 100.

[0279] In one embodiment, there is one fourth protrusion 142 , which is arranged to extend along the first direction X. In one embodiment, there are multiple fourth protrusions 142 , which are arranged to be spaced apart along the first direction X.

[0280] In one embodiment, a fifth protrusion 143 is defined on the fourth wall 14 . The fifth protrusion 143 extends from a surface of the fourth wall 14 toward the third wall 13 .

[0281] In one embodiment, along the second direction Y, the fifth protrusion 143 is provided on a side of the second shell 611 facing away from the first shell 211 and is connected to the second insulating member 62 at the end of the second shell 611. The fifth protrusion 143 facilitates limiting the relative displacement of the second battery cell 61 along the second direction Y. The fifth protrusion 143 cooperates with the third protrusion 141 to limit the displacement of the third shell 10 along the second direction Y, thereby reducing the number of limiters or fillers for the second battery cell 61 in the electrochemical device 100 and reducing the cost of the electrochemical device 100.

[0282] In one embodiment, there is one fifth protrusion 143 , which is arranged to extend along the first direction X. In one embodiment, there are multiple fifth protrusions 143 , which are arranged to be spaced apart along the first direction X.

[0283] In one embodiment, a sixth protrusion (not shown) is provided on the third wall 13, extending from the surface of the third wall 13 toward the fourth wall 14. In one embodiment, the sixth protrusion corresponds to the position, function, and effect of the third protrusion 141, and will not be further described here.

[0284] In one embodiment, a seventh protrusion (not shown) is provided on the third wall 13, extending from the surface of the third wall 13 toward the fourth wall 14. In one embodiment, the seventh protrusion corresponds to the fourth protrusion 142 in position, function, and effect, and will not be further described herein.

[0285] In one embodiment, an eighth protrusion (not shown) is provided on the third wall 13, extending from the surface of the third wall 13 toward the fourth wall 14. In one embodiment, the eighth protrusion corresponds to the fifth protrusion 143 in position, function, and effect, and will not be further described herein.

[0286] In one embodiment, along the third direction Z, the fourth wall 14 and the third wall 13 are respectively connected to the two ends of the first insulating member 22, and the fourth wall 14 and the third wall 13 are respectively connected to the two ends of the second insulating member 62. The fourth wall 14 and the third wall 13 are connected to the first insulating member 22 and the second insulating member 62 by matching, which is beneficial to reducing the number of limiting members for the first battery cell assembly 20 and the second battery cell assembly 60, thereby saving the cost of the electrochemical device 100.

[0287] In summary, in the electrochemical device 100 of the present application, the first structural member 30 is arranged on one side of the first battery cell assembly 20 along the first direction X. The first structural member 30 can apply pressure to the first battery cell 21 through the deformation of the first bottom plate 31, thereby improving the service life of the first battery cell assembly 20.

[0288] As shown in FIG25 , an embodiment of the present application further provides an electrical device 200, comprising the electrochemical device 100 described in any of the aforementioned embodiments. The electrochemical device 100 can provide electrical energy to the electrical device 200. The electrochemical device 100 applies pressure to the first battery cell 21 via the first structural member 30, thereby extending the service life of the electrochemical device 100 and reducing the impact of the service life of the electrochemical device 100 on the electrical device 200.

[0289] In one embodiment, the electric device 200 includes but is not limited to any one of a drone, an electric two-wheeled vehicle, a household appliance, and a robot.

[0290] In addition, those skilled in the art may also make other changes within the spirit of this application. Of course, these changes made according to the spirit of this application should be included in the scope disclosed in this application.

Claims

1. An electrochemical device, characterized in that include: A first battery cell assembly, the first battery cell assembly comprising a plurality of first battery cells, wherein the plurality of first battery cells are stacked along a first direction; At least one first structural member, wherein the first structural member and the first battery cell assembly are arranged along the first direction; The housing comprises a first space, wherein at least a portion of the first battery cell assembly is disposed in the first space; The first structural member includes a first bottom plate and two first side plates connected to the first bottom plate, wherein the two first side plates are spaced apart along a second direction, and the second direction is perpendicular to the first direction; The two first side plates are fixedly connected to the shell.

2. The electrochemical device according to claim 1, wherein The housing includes a first wall, a second wall, a third wall, and a fourth wall, wherein the first wall and the second wall are spaced apart along the second direction, and the third wall and the fourth wall are spaced apart along a third direction, and the third direction is perpendicular to both the first direction and the second direction; One of the two first side panels is fixedly connected to the first wall, and the other is fixedly connected to the second wall; And / or, one of the two first side panels is fixedly connected to the third wall, and the other of the two first side panels is fixedly connected to the fourth wall.

3. The electrochemical device according to claim 2, wherein The housing further includes a fifth wall. Along the first direction, the fifth wall is provided on a side of the first structural member away from the first battery core assembly.

4. The electrochemical device according to claim 3, wherein The electrochemical device includes two first structural members, and the housing further includes a sixth wall, wherein the sixth wall and the fifth wall are spaced apart along the first direction; Along the first direction, the fifth wall is provided on a side of one of the first structural members away from the first battery core assembly, and the sixth wall is provided on a side of another of the first structural members away from the first battery core assembly.

5. The electrochemical device according to claim 3, wherein One of the two first side panels is fixedly connected to the first wall and the fifth wall.

6. The electrochemical device according to claim 1, wherein The number of the first structural member is one; Along the first direction, there is a first distance d1 between the edges of the first bottom plate and the first side plate, satisfying d1≥n*d0*16%, where n is the number of first battery cells in the first battery cell assembly, and d0 is the length of the first battery cell along the first direction.

7. The electrochemical device according to claim 1, wherein There are two first structural members, and the two first structural members are respectively arranged on both sides of the first battery core assembly along the first direction and are both connected to the housing; Along the first direction, there is a first distance d1 between the edges of the first bottom plate and the first side plate, d1≥n*d0*8%, where n is the number of first battery cells in the first battery cell assembly, and d0 is the length of the first battery cell along the first direction.

8. The electrochemical device according to claim 1, wherein The first structural member further includes two first protrusions provided on the first bottom plate. The two first protrusions are located between the two first side plates and are spaced apart along the second direction.

9. The electrochemical device according to claim 8, wherein The first battery cell includes a first battery cell housing, a first electrode assembly, and a first electrode terminal connected to the first electrode assembly and extending from the first battery cell housing; Along the first direction, projections of the first electrode assembly and the two first protrusions are separated from each other.

10. The electrochemical device according to claim 8, wherein The first structural member further includes a first through hole and a second through hole provided on the first bottom plate, wherein the first through hole and the second through hole are located between the two first protrusions.

11. The electrochemical device according to claim 10, wherein The first battery cell includes a first battery cell housing, a first electrode assembly, and a first electrode terminal connected to the first electrode assembly and extending from the first battery cell housing; Along the first direction, a projection of the first electrode assembly is separated from a projection of the first through hole, and a projection of the first electrode assembly is separated from a projection of the second through hole.

12. The electrochemical device according to claim 1, wherein The first battery cell includes a first battery cell housing, a first electrode assembly, and a first electrode terminal connected to the first electrode assembly and extending from the first battery cell housing; The electrochemical device further includes a first insulating member, the first insulating member being bonded to at least a portion of the first cell casing and at least a portion of the first electrode terminal extending outside the first cell casing; In the first direction, a projection of the first electrode assembly is separated from a projection of the first insulating member.

13. The electrochemical device according to claim 12, wherein In the first direction, a projection of the first insulating member is located within a projection of the first bottom plate.

14. The electrochemical device according to claim 1, wherein The first structural member further includes two second side plates connected to the first bottom plate. The two second side plates are spaced apart along a third direction, and the third direction is perpendicular to both the first direction and the second direction.

15. The electrochemical device according to claim 14, wherein Along the first direction, the two first side panels and the two second side panels are projected away from each other.

16. The electrochemical device according to claim 14, wherein The first structural member further includes two first protrusions provided on the first bottom plate, the two first protrusions being located between the two first side plates and spaced apart along the second direction; The first structural member has a first area, and the first area is located between the two first protrusions; A third through hole is provided at a connection between the second side plate and the first bottom plate, and a projection of the third through hole is separated from a projection of the first area.

17. The electrochemical device according to claim 1, wherein The electrochemical device further includes a second battery cell assembly, at least a portion of which is disposed in the first space and arranged along the second direction with the first battery cell assembly, the second battery cell assembly including a plurality of second battery cells, and the plurality of second battery cells are stacked along the first direction; Along the first direction, the first structural member and the second battery core assembly are arranged in an aligned manner.

18. The electrochemical device according to claim 17, wherein The first structural member further includes two first protrusions provided on the first bottom plate, the two first protrusions being located between the two first side plates and spaced apart along the second direction; The second battery cell includes a second battery cell housing, a second electrode assembly, and a second electrode terminal connected to the second electrode assembly and extending from the second battery cell housing; Along the first direction, projections of the second electrode assembly and the two first protrusions are separated from each other.

19. The electrochemical device according to claim 18, wherein The first structural member further includes a first through hole and a second through hole provided on the first bottom plate, wherein the first through hole and the second through hole are located between the two first protrusions; Along the first direction, a projection of the second electrode assembly is separated from a projection of the first through hole, and a projection of the second electrode assembly is separated from a projection of the second through hole.

20. The electrochemical device according to claim 17, wherein The second battery cell includes a second battery cell housing, a second electrode assembly, and a second electrode terminal connected to the second electrode assembly and extending from the second battery cell housing; The electrochemical device further includes a second insulating member, the second insulating member covering at least a portion of the second battery cell casing and at least a portion of the second electrode terminal extending outside the second battery cell casing; In the first direction, a projection of the second electrode assembly is separated from a projection of the second insulating member.

21. The electrochemical device according to claim 20, wherein In the first direction, a projection of the second insulating member is located within a projection of the first bottom plate.

22. The electrochemical device according to claim 17, wherein The first structural member further includes a second protrusion, the second protrusion is provided on the first bottom plate, and the second protrusion is located between the two first side plates; The first structural member has a first area and a second area, the first area is located between the second protrusion and one of the first side plates, and the second area is located between the second protrusion and the other first side plate; In the first direction, a projection of the first region at least partially overlaps with a projection of the first electrode assembly, and a projection of the second region at least partially overlaps with a projection of the second electrode assembly.

23. The electrochemical device according to claim 22, wherein The first structural member is further provided with a fourth through hole and a fifth through hole. The fourth through hole is provided in the first region, and the fifth through hole is provided in the second region.

24. The electrochemical device according to claim 1, wherein The electrochemical device further includes a first elastic member, which is disposed between the first bottom plate and the first battery cell upper assembly and connects the first bottom plate and the first battery cell assembly.

25. The electrochemical device according to claim 1, wherein Along the first direction, at least two adjacent battery cells among the plurality of first battery cells are arranged in contact with each other.

26. An electrical device, characterized in that: Comprising the electrochemical device according to any one of claims 1 to 25.

Images