CN115663367A

CN115663367A - Electrochemical device and electric equipment

Info

Publication number: CN115663367A
Application number: CN202211262689.6A
Authority: CN
Inventors: 彭芳桂; 刘小平; 杨鹏程
Original assignee: Xiamen Xinnengda Technology Co Ltd
Current assignee: Xiamen Xinnengda Technology Co Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-01-31
Also published as: WO2024078497A1

Abstract

The application discloses electrochemical device and consumer, electrochemical device includes shell, electric core subassembly, circuit board and first sealing member. The shell comprises a first shell and a second shell which are connected with each other, the first shell is provided with a closed first space, the second shell is connected with the first shell to form a second space, and the second space is isolated from the first space. The electric core component is arranged in the first space. The circuit board is arranged in the second space and can be electrically connected with the electric core assembly, and the circuit board comprises a plurality of components. The first sealing member is arranged in the second space and covers at least part of the plurality of components. Among the foretell electrochemical device, the shell passes through first casing and closely protects electric core subassembly, covers the protection through the first sealing member in the second casing with the components and parts on the circuit board at least partially, can improve electrochemical device barrier propterty, reduces among the external environment debris to electrochemical device's influence.

Description

Electrochemical device and electric equipment

Technical Field

The application relates to the technical field of energy storage, in particular to an electrochemical device and electric equipment.

Background

At present, with the rapid development of new energy batteries, new energy batteries are applied to more and more industrial fields. Under some complicated working conditions, the electrochemical device including the battery module may be exposed to liquid, even corrosive liquid, and if the liquid extends into the electrochemical device, the normal use of the electrochemical device will be seriously affected.

Disclosure of Invention

In view of the above, it is desirable to provide an electrochemical device capable of reducing the influence of the external environment on the electrochemical device.

Embodiments of the present application provide an electrochemical device including a housing, a cell assembly, a circuit board, and a first seal. The shell comprises a first shell and a second shell which are connected with each other, the first shell is provided with a closed first space, the second shell and the second shell are connected to form a second space, and the second space is isolated from the first space. The electric core assembly is arranged in the first space. The circuit board is arranged in the second space and can be electrically connected with the electric core assembly, and the circuit board comprises a plurality of components. The first sealing member is arranged in the second space and covers at least part of the plurality of components.

Among the foretell electrochemical device, the shell passes through first casing and protects electric core component is airtight, covers the protection through the first sealing member in the second casing with the components and parts on the circuit board at least partially, can improve electrochemical device barrier propterty, reduces among the external environment debris to electrochemical device's influence.

In some embodiments of the present application, the first housing includes a top wall provided with a first through hole penetrating through the top wall. The electrochemical device also includes a first terminal and a second seal. The first terminal is partially accommodated in the first space and connected to the electric core assembly, and the first terminal partially penetrates through the first through hole and extends into the second space so as to be connected with the circuit board. The second sealing member at least partially fills the first through hole and connects the first terminal and the top wall.

The first terminal enables the electric core assembly in the first space to be connected to the circuit board in the second space, and the second sealing element can reduce the risk that external impurities enter the first space or the second space through a gap between the first terminal and the inner wall of the first through hole.

In some embodiments of the present application, the first terminal is one of a positive connection terminal and a negative connection terminal of the cell assembly for input and output of electric energy of the cell assembly.

In some embodiments of the present application, the electrochemical device further includes a third terminal, a portion of the third terminal is accommodated in the second space and connected to the circuit board, and the third terminal is connected to the first terminal.

In some embodiments of the present application, the circuit board includes a BMS (Battery Management System, BMS for short) module, and the BMS module includes a plurality of electronic components, and the plurality of electronic components can realize functions such as data acquisition, control, protection, communication, electric quantity calculation, signal transmission, electric energy transmission to electric core.

In some embodiments of the present application, the first housing includes a top wall provided with a third through hole, the third through hole penetrating the top wall. The electrochemical device further comprises a wire harness and a fourth sealing element, wherein part of the wire harness is accommodated in the first space and electrically connected with the electric core assembly, part of the wire harness penetrates through the third through hole and extends into the second space to be connected with the circuit board, the wire harness can obtain electric signal information of the electric core assembly, and at least part of the fourth sealing element is filled in the third through hole and is connected with the wire harness and the top wall.

The wire harness enables the circuit board to obtain electric signal information of the core assembly, and the fourth sealing element can reduce the risk that external sundries enter the first space or the second space through a gap between the wire harness and the inner wall of the third through hole.

In some embodiments of the present application, the electrochemical device further includes a connector detachably connected to the second case, a portion of the connector being located in the second space and detachably connected to the circuit board, and a portion of the connector protruding out of the second case.

The connecting piece enables the electrochemical device to be electrically connected with external equipment, and is detachably connected with the second shell, so that the electrochemical device is convenient to assemble and disassemble, and the working efficiency can be improved.

In some embodiments of the present application, the circuit board includes a first portion and a second portion, the first portion and the second portion being detachably connected to each other, facilitating assembly and disassembly, and improving space utilization in the second housing; the first sealing member covers at least part of the first part and/or covers at least part of the second part, and the first sealing member can improve the protective performance of the circuit board and reduce the risk of the circuit board being polluted by external sundries.

In some embodiments of the present application, the first housing includes a peripheral wall, a top wall and a bottom wall, the peripheral wall connects the top wall and the bottom wall, and an edge of the top wall extends beyond the peripheral wall to facilitate a fixed connection of the top wall and the peripheral wall.

In some embodiments of the present application, the first housing includes a peripheral wall, a top wall, and a bottom wall, the peripheral wall connecting the top wall and the bottom wall; the top wall is provided with a first concave part, and part of the peripheral wall is accommodated in the first concave part; the electrochemical device further comprises a fifth sealing member at least partially filling the first recess, the fifth sealing member disposed in the first recess connecting the peripheral wall and the inner wall of the first recess. The fifth sealing element can play a role in sealing, so that the risk that gas or liquid in the first space leaks out through a gap at the joint of the peripheral wall and the first concave part is reduced, and the risk that sundries outside the first space enter the first space through the gap at the joint of the peripheral wall and the first concave part to pollute the electric core assembly is reduced.

In some embodiments of the present application, the first housing includes a peripheral wall, a top wall, and a bottom wall, the peripheral wall connecting the top wall and the bottom wall; the bottom wall is provided with a second concave part, and part of the peripheral wall is accommodated in the second concave part; the electrochemical device further includes a sixth seal disposed in the second recess, the sixth seal connecting the perimeter wall and the bottom wall. The sixth sealing element can play a role in sealing, so that the risk that gas or liquid in the first space leaks out through a gap at the joint of the peripheral wall and the second concave part is reduced, and the risk that sundries outside the first space enter the first space through the gap at the joint of the peripheral wall and the second concave part is reduced.

In some embodiments of the present application, a first convex portion is further disposed on a side of the bottom wall facing the first space, the first convex portion is disposed in the second concave portion, the first convex portion extends from a surface of the bottom wall toward the first space, and the peripheral wall abuts against the first convex portion.

In some embodiments of the present application, the peripheral wall comprises a first wall, a second wall, a third wall, and a fourth wall, each of the top wall and the bottom wall connecting the first wall, the second wall, the third wall, and the fourth wall; the electrochemical device further includes a plurality of seventh seals, portions of the plurality of seventh seals connecting the first wall and the second wall, portions of the plurality of seventh seals connecting the second wall and the third wall, portions of the plurality of seventh seals connecting the third wall and the fourth wall, and portions of the plurality of seventh seals connecting the first wall and the fourth wall.

In some embodiments of the present application, the second housing and the top wall form a second space.

In some embodiments of the present application, the second case is provided with a first connection hole, the top wall is provided with a second connection hole, the circumferential wall is provided with a third connection hole, and the electrochemical device further includes a fastening member passing through the first connection hole _、 A second connection hole and a third connection hole.

In one embodiment, the electrochemical device further includes a first wire harness partially received in the first space and used for connecting the core assembly, and a portion of the first wire harness extends into the second space to connect the circuit board. The circuit board can obtain the electric signal information of the electric core in the electric core assembly through the first wire harness.

In some embodiments of the application, the top wall is further provided with a fixing portion, the fixing portion is arranged on the surface of the top wall and located in the second space, and the fixing portion can be used for connecting the first wire harness and/or the second wire harness to limit movement of the first wire harness and/or the second wire harness, so that influence of shaking of the electrochemical device on the first wire harness and/or the second wire harness is reduced.

Embodiments of the present application further provide a power consumption apparatus including the electrochemical device according to any one of the foregoing embodiments.

Among the foretell consumer, electrochemical device has better barrier propterty, thereby can reduce because of the influence of debris entering electrochemical device in the external environment to the consumer.

Drawings

Fig. 1 is a schematic view of the structure of an electrochemical device in one embodiment of the present application.

Fig. 2 is a schematic structural view of the electrochemical device shown in fig. 1 in a state where a first case is separated from a second case.

Fig. 3 is an exploded view of a first case and an internal structure of the electrochemical device shown in fig. 1.

Fig. 4 is an exploded view of a second case and an internal structure of the electrochemical device shown in fig. 1.

Fig. 5 is a schematic structural diagram of a cell in an embodiment of the present application.

Fig. 6 is a schematic structural diagram of the battery cell shown in fig. 5 before encapsulation.

Fig. 7 is a first view of a top wall in an embodiment of the present application.

Fig. 8 is a second view of the top wall in an embodiment of the present application.

FIG. 9 is a first view of a bottom wall in an embodiment of the present application.

FIG. 10 is a second view of the bottom wall in an embodiment of the present application.

Fig. 11 is a schematic view of a second case and an internal structure of the electrochemical device shown in fig. 1.

Fig. 12 is a schematic diagram of a circuit board structure in an embodiment of the present application.

Fig. 13 is an exploded view of the circuit board shown in fig. 12.

FIG. 14 is a schematic diagram of an electric device in one embodiment of the present application.

Description of the main elements

Electrochemical device 100

Outer casing 10

First housing 11

First space 111

Peripheral wall 112

Third connecting hole 1120

First wall 1121

Second wall 1122

Third wall 1123

Fourth wall 1124

The top wall 113

First via 1131

Second via 1132

Third via 1133

First surface 11341

Second surface 11342

First recess 11343

Second boss 1136

Third boss 1137

Fourth protrusion 1138

Fixing part 1139

Bottom wall 115

Third surface 11511

Fourth surface 11512

Second recess 11513

First projection 1153

Second connecting hole 116

Second housing 12

The second space 121

Fifth wall 122

Sixth wall 123

Seventh wall 124

Eighth wall 125

Ninth wall 126

First connection hole 127

Electrical core assembly 20

Battery cell 21

Battery cell casing 211

First cell casing 2111

Second cell casing 2112

Main body portion 2113

Edge sealing portion 2114

Top seal edge 21141

Side edge banding 21142

Electrode assembly 212

Tab 213

Positive tab 2131

Negative electrode tab 2132

Circuit board 30

First part 31

Second part 32

First seal 41

Second seal 42

Third seal 43

Fourth seal 44

Seventh seal 45

First terminal 51

Second terminal 52

Third terminal 53

Fourth terminal 54

First wire harness 55

First connector 551

Second harness 56

Second connector 561

Adapter plate 60

Substrate 61

Fourth via hole 611

Conductive member 62

Connector 70

Third connector 71

Fastener 80

Electrical consumer 200

A first direction X

Second direction Y

Third direction Z

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Embodiments of the present application provide an electrochemical device including a housing, an electrical core assembly, a circuit board, and a first seal. The shell comprises a first shell and a second shell which are connected with each other, the first shell is provided with a closed first space, the second shell and the first shell are provided with a second space, and the second space is isolated from the first space. The electric core assembly is arranged in the first space. The circuit board is arranged in the second space and can be electrically connected with the electric core assembly, and the circuit board comprises a plurality of components. The first sealing member is arranged in the second space and covers at least part of the plurality of components.

Embodiments of the present application will be further described with reference to the drawings.

As shown in fig. 1 and 2, the embodiment of the present application provides an electrochemical device 100 including a case 10, the case 10 including a first case 11 and a second case 12, the first case 11 and the second case 12 being connected to each other.

In one embodiment, the first housing 11 and the second housing 12 can be detached from each other, and after the first housing 11 and the second housing 12 are disconnected, the first housing 11 and the second housing 12 can be used as two modules independent from each other, and when any one of the modules has a problem and needs to be replaced or maintained, the first housing 11 and the second housing 12 are detached for replacement, so that the working efficiency can be improved, and the maintenance cost can be reduced. In an embodiment, the first shell 11 and the second shell 12 are connected by bolts, so that the tightness of the connection between the first shell 11 and the second shell 12 can be improved, and the protection capability of the outer shell 10 can be improved. In one embodiment, the first housing 11 and the second housing 12 are connected by snap-fit. In an embodiment, the first shell 11 and the second shell 12 are bonded by a sealant, the sealant can not only fixedly connect the first shell 11 and the second shell 12, but also play a role in sealing, so as to reduce the risk that foreign matters outside the housing 10 enter the housing 10 through a gap between the first shell 11 and the second shell 12, optionally, the sealant is coated on the connecting surface area of the first shell 11 and the second shell 12, and optionally, the sealant includes, but is not limited to, any one of epoxy resin, heat-conducting silica gel, silicone adhesive, hot melt adhesive and a polymer.

As shown in fig. 2, 3 and 4, the first housing 11 is provided with a closed first space 111, the second housing 12 is provided with a second space 121, and the first space 111 and the second space 121 are isolated from each other. The first space 111 and the second space 121 are isolated from each other, which means that the first space 111 and the second space 121 are not communicated.

The electrochemical device 100 further comprises a cell assembly 20, a circuit board 30 and a first sealing member 41, the cell assembly 20 is disposed in the first space 111, the circuit board 30 and the first sealing member 41 are disposed in the second space 121, the cell assembly 20 and the circuit board 30 are electrically connected, the circuit board 30 comprises a plurality of components, and the first sealing member 41 covers at least a portion of the plurality of components.

In the electrochemical device 100 of the present application, the outer shell 10 protects the electric core assembly 20 through the first casing 11, and at least a part of the components on the circuit board 30 is covered and protected through the first sealing member 41 in the second casing 12, so that the protection performance of the electrochemical device 100 can be improved, and the influence of impurities in the external environment on the components on the electric core assembly 20 and the circuit board 30 can be reduced.

In an embodiment, the battery cell assembly 20 includes a plurality of battery cells 21, and the plurality of battery cells 21 are sequentially stacked.

In one embodiment, the first sealing element 41 is formed by coating a first sealant on the surface of the circuit board 30 and then curing the first sealant. In one embodiment, the first sealant includes, but is not limited to, any of epoxy, thermally conductive silicone, hot melt, and polyvinyl.

In one embodiment, the first housing 11 includes a peripheral wall 112, a top wall 113 and a bottom wall 115, the peripheral wall 112 connects the top wall 113 and the bottom wall 115, and the peripheral wall 112, the top wall 113 and the bottom wall 115 enclose the first space 111. The top wall 113 and the bottom wall 115 are oppositely disposed along the third direction Z, and the first housing 11 and the second housing 12 are oppositely disposed along the third direction Z.

In one embodiment, the edge of the top wall 113 extends beyond the peripheral wall 112 to facilitate the secure attachment of the top wall 113 to the peripheral wall 112.

In one embodiment, the peripheral wall 112 includes a first wall 1121, a second wall 1122, a third wall 1123, and a fourth wall 1124, the first wall 1121 and the second wall 1122 are oppositely disposed along the first direction X, the third wall 1123 and the fourth wall 1124 are oppositely disposed along the second direction Y, the first wall 1121 and the second wall 1122 are connected to the third wall 1123 and the fourth wall 1124, the first wall 1121, the second wall 1122, the third wall 1123, and the fourth wall 1124 are connected to the top wall 113 and the bottom wall 115, and the first wall 1121, the second wall 1122, the third wall 1123, the fourth wall 1124, the top wall 113, and the bottom wall 115 are surrounded to form the first space 111. In an embodiment, any two of the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

In one embodiment, the peripheral wall 112 is an integrally formed structure. In an embodiment, the peripheral wall 112 is formed by connecting a first wall 1121, a second wall 1122, a third wall 1123 and a fourth wall 1124 in sequence by welding, the first wall 1121 connects the third wall 1123 and the fourth wall 1124 by welding, the second wall 1122 connects the third wall 1123 and the fourth wall 1124 by welding, and a gap at the connection of the first wall 1121 and the third wall 1123, a gap at the connection of the second wall 1122 and the third wall 1123, a gap at the connection of the third wall 1123 and the fourth wall 1124 and a gap at the connection of the fourth wall 1124 and the first wall 1121 are sealed by welding, so that the risk of gas or liquid in the first space 111 leaking out through the gaps can be reduced, and foreign objects outside the first space 111 can be reduced from entering the first space 111 through the gaps, thereby reducing the risk of polluting the electrical core assembly 20.

In an embodiment, the second housing 12 is connected to the top wall 113, the second housing 12 and the top wall 113 enclose a second space 121, and the first space 111 and the second space 121 are respectively located on two sides of the top wall 113 along the third direction Z.

In an embodiment, the top wall 113 is provided with a first through hole 1131 therethrough, and the first through hole 1131 can communicate the first space 111 and the second space 121.

In an embodiment, the top wall 113 is provided with a second through hole 1132 therethrough, and the second through hole 1132 can communicate the first space 111 and the second space 121.

In one embodiment, the electrochemical device 100 further includes a first terminal 51. In some embodiments, the electrochemical device 100 further includes a second terminal 52. The first terminal 51 is partially received in the first space 111 and electrically connected to the core assembly 20, and the first terminal 51 partially passes through the first through hole 1131 and extends into the second space 121 to be connected to the circuit board 30. The second terminal 52 is partially received in the first space 111 and electrically connected to the core assembly 20, and a portion of the second terminal 52 passes through the second through hole 1132 and extends into the second space 121 to connect to the circuit board 30. The first terminal 51 and the second terminal 52 enable the electric core assembly 20 to be electrically connected to the circuit board 30, and the electric core assembly 20 can realize charging and discharging through the first terminal 51 and the second terminal 52. In one embodiment, the first terminal 51 is connected to the circuit board 30 by direct contact. In one embodiment, the second terminal 52 is connected to the circuit board 30 by direct contact. In one embodiment, one of the first terminal 51 and the second terminal 52 is a positive connection terminal of the cell assembly 20, and the other is a negative connection terminal of the cell assembly 20, and the first terminal 51 and the second terminal 52 are used for inputting and outputting electric energy of the cell assembly 20.

In one embodiment, the electrochemical device 100 further comprises a second seal 42. In one embodiment, the electrochemical device 100 further comprises a third seal 43. The second sealing member 42 is at least partially filled in the first through hole 1131, the second sealing member 42 filled in the first through hole 1131 connects the first terminal 51 and the inner wall of the first through hole 1131, and fills the gap between the first terminal 51 and the inner wall of the first through hole 1131, and the second sealing member 42 can play a role in sealing, so that the risk that gas or liquid in the first space 111 leaks out through the gap between the first terminal 51 and the inner wall of the first through hole 1131, and the risk that foreign matters outside the first space 111 enter the first space 111 through the gap between the first terminal 51 and the inner wall of the first through hole 1131 are reduced. The third sealing member 43 is at least partially filled in the second through hole 1132, the third sealing member 43 filled in the second through hole 1132 is connected with the inner walls of the second terminal 52 and the second through hole 1132, and a gap between the inner walls of the second terminal 52 and the second through hole 1132 is filled, the third sealing member 43 can play a role in sealing, the risk that gas or liquid in the first space 111 leaks out through the gap between the inner walls of the second terminal 52 and the second through hole 1132 is reduced, and the risk that foreign matters outside the first space 111 enter the first space 111 through the gap between the inner walls of the second terminal 52 and the second through hole 1132 is reduced.

In one embodiment, the second sealing member 42 is formed by filling the gap between the first terminal 51 and the inner wall of the first through hole 1131 with a second sealant and then curing the second sealant. In one embodiment, the second sealant includes, but is not limited to, any one of epoxy, thermally conductive silicone, hot melt adhesive, and polyvinyl chloride.

In one embodiment, the third sealing member 43 is formed by filling a gap between the second terminal 52 and the inner wall of the second through hole 1132 with a third sealant and then curing the third sealant. In one embodiment, the third sealant includes, but is not limited to, any one of epoxy, thermally conductive silicone, hot melt adhesive, and polyvinyl chloride.

In one embodiment, the electrochemical device 100 further comprises a third terminal 53. In one embodiment, the electrochemical device 100 further includes a fourth terminal 54. A portion of the third terminal 53 is accommodated in the second space 121 and connected to the circuit board 30, a portion of the third terminal 53 is connected to the first terminal 51 to electrically connect the core assembly 20, a portion of the fourth terminal 54 is accommodated in the second space 121 and connected to the circuit board 30, a portion of the fourth terminal 54 is connected to the second terminal 52 to electrically connect the core assembly 20, and the core assembly 20 is electrically connected to the circuit board 30 by connecting the first terminal 51 to the third terminal 53 and connecting the second terminal 52 to the fourth terminal 54.

In an embodiment, the first terminal 51, the second terminal 52, the third terminal 53 and the fourth terminal 54 are flexible structures capable of elastic deformation, before the first housing 11 and the second housing 12 are connected in a matching manner, the first terminal 51 is connected to the third terminal 53, the second terminal 52 is connected to the fourth terminal 54, and then the first housing 11 and the second housing 12 are connected in a matching manner, so that the influence of the relative movement of the first housing 11 and the second housing 12 on the connection of the first terminal 51 to the third terminal 53 and the influence on the connection of the second terminal 52 to the fourth terminal 54 can be reduced, and the risk of connection failure of the first terminal 51 and the third terminal 53 and the risk of connection failure of the second terminal 52 and the fourth terminal 54 can be reduced.

In one embodiment, the top wall 113 is provided with a third through hole 1133 therethrough, and the third through hole 1133 can communicate the first space 111 and the second space 121.

In one embodiment, the electrochemical device 100 further includes a first wire 55, a portion of the first wire 55 is received in the first space 111 and is used for connecting the electric component 20, and a portion of the first wire 55 passes through the third through hole 1133 and extends into the second space 121 to electrically connect the circuit board 30.

In an embodiment, the electrochemical device 100 further includes a second wire harness 56, the second wire harness 56 is accommodated in the second space 121, and the second wire harness 56 is connected to the first wire harness 55 and the circuit board 30, so that the circuit board 30 is electrically connected to the core assembly 20 through the first wire harness 55 and the second wire harness 56, and the circuit board 30 can obtain electrical signal information, such as voltage information and electric quantity information, of each cell 21 in the core assembly 20. Optionally, the circuit board 30 obtains the voltage information of the battery cells 21 through the first wire harness 55 and the second wire harness 56.

In one embodiment, the first harness 55 includes the first connector 551, the second harness 56 includes the second connector 561, the first connector 551 and the second connector 561 are pluggable plug-in connections, and the first harness 55 and the second harness 56 are pluggable plug-in connections through the connectors, which can improve connection efficiency and shorten assembly time.

In an embodiment, the first harness 55 and the second harness 56 are deformable and flexible structures, before the first housing 11 and the second housing 12 are connected in a matching manner, the first harness 55 and the second harness 56 are connected in a plugging manner, and then the first housing 11 and the second housing 12 are connected in a matching manner, so that through elastic deformation of the first harness 55 and the second harness 56, the influence of relative movement of the first housing 11 and the second housing 12 on the connection of the first harness 55 and the second harness 56 can be reduced, and the risk of connection failure of the first harness 55 and the second harness 56 is reduced.

In an embodiment, the top wall 113 is further provided with a fixing portion 1139, the fixing portion 1139 is provided on a surface of the top wall 113 and is located in the second space 121, and the fixing portion 1139 can be used for connecting the first wire harness 55 and/or the second wire harness 56 to limit movement of the first wire harness 55 and/or the second wire harness 56, so as to reduce an influence of shaking of the electrochemical device 100 on the first wire harness 55 and/or the second wire harness 56. In one embodiment, the fixing portion 1139 includes a buckle having an elastic opening, and the elastic deformation of the buckle opening can accommodate the first wire harness 55 and/or the second wire harness 56 and release the first wire harness 55 and/or the second wire harness 56. Alternatively, a portion of the second harness 56 is connected to the fixing portion 1139.

In an embodiment, the electrochemical device 100 further includes a fourth sealing member 44, the fourth sealing member 44 is at least partially filled in the third through hole 1133, the fourth sealing member 44 filled in the third through hole 1133 connects the inner walls of the first wire bundle 55 and the third through hole 1133, and fills a gap between the first wire bundle 55 and the inner wall of the third through hole 1133, and the fourth sealing member 44 can perform a sealing function, so as to reduce a risk of gas or liquid in the first space 111 leaking out through the gap between the first wire bundle 55 and the inner wall of the third through hole 1133, and reduce impurities outside the first space 111 entering the first space 111 through the gap between the first wire bundle 55 and the inner wall of the third through hole 1133, thereby reducing a risk of contaminating the cell assembly 20.

In one embodiment, the fourth sealing element 44 is formed by filling the gap between the first wire harness 55 and the inner wall of the third through hole 1133 with a fourth sealant and then curing the fourth sealant. In one embodiment, the fourth sealant includes, but is not limited to, any one of epoxy, thermally conductive silicone, hot melt adhesive, and polyvinyl chloride.

In an embodiment, the second housing 12 includes a fifth wall 122, a sixth wall 123, a seventh wall 124, an eighth wall 125, and a ninth wall 126, the fifth wall 122 and the sixth wall 123 are disposed oppositely along the first direction X, the seventh wall 124 and the eighth wall 125 are disposed oppositely along the second direction Y, the ninth wall 126 is disposed oppositely along the third direction Z with respect to the top wall 113, the ninth wall 126 connects the fifth wall 122, the sixth wall 123, the seventh wall 124, and the eighth wall 125, the fifth wall 122, the sixth wall 123, the seventh wall 124, and the eighth wall 125 all connect the top wall 113, and the fifth wall 122, the sixth wall 123, the seventh wall 124, the eighth wall 125, the ninth wall 126, and the top wall 113 enclose the second space 121.

As shown in fig. 5 and 6, in an embodiment, the battery cell 21 includes a cell casing 211, an electrode assembly 212, and tabs 213, wherein the electrode assembly 212 is disposed inside the cell casing 211, a portion of the tabs 213 is located inside the cell casing 211 and connected to the electrode assembly 212, and a portion of the tabs 213 protrudes out of the cell casing 211.

In one embodiment, the electrode assembly 212 includes a positive electrode sheet, a negative electrode sheet, and a separator (not shown) disposed therebetween, and the positive electrode sheet, the separator, and the negative electrode sheet are wound or stacked to form the electrode assembly 212.

In an embodiment, the cell casing 211 includes a first cell casing 2111 and a second cell casing 2112 connected to each other, and after the first cell casing 2111 and the second cell casing 2112 are folded in half, an inner space capable of accommodating the electrode assembly 212 may be formed. In one embodiment, the cell casing 211 includes a first cell casing and a second cell casing (not shown) separated from each other, and the first cell casing and the second cell casing are attached to each other to form an inner space capable of accommodating the electrode assembly 212.

In one embodiment, the cell casing 211 includes a main body portion 2113 and a sealing portion 2114 connected to each other, the sealing portion 2114 extends from the main body portion 2113, the electrode assembly 212 is accommodated in the main body portion 2113, and the tab 213 extends from the sealing portion 2114 to the cell casing 211. The sealing edge portion 2114 includes a top sealing edge 21141 and a side sealing edge 21142 which are connected to each other, the top sealing edge 21141 is located at an end portion of the main body portion 2113 along the third direction Z, the side sealing edge 21142 is located at an end portion of the main body portion 2113 along the second direction Y, and the tab 213 extends out of the cell housing 211 from the top sealing edge 21141. In an embodiment, the number of the side sealing edges 21142 is two, two side sealing edges 21142 are respectively located at two opposite ends of the main body portion 2113 along the second direction Y, and the top sealing edge 21141 is located between the two side sealing edges 21142 and connects the two side sealing edges 21142. Tab 213 includes positive tab 2131 and negative tab 2132, with positive tab 2131 being connected to the positive plate and negative tab 2132 being connected to the negative plate. In one embodiment, the positive electrode tabs 2131 and the negative electrode tabs 2132 are located on the same side of the cell housing 211. In one embodiment, the positive and

negative electrode tabs

2131 and 2132 are located at opposite ends (not shown) of the cell housing 211.

As an example, the positive electrode tab 2131 and the negative electrode tab 2132 are located on the same side of the cell housing 211.

Referring to fig. 2, fig. 3 and fig. 7, in an embodiment, a plurality of battery cells 21 are sequentially stacked along a first direction X.

In one embodiment, the electrochemical device 100 further includes a plurality of seventh sealing members 45, a portion of the plurality of seventh sealing members 45 connects the first wall 1121 and the third wall 1123, a portion of the plurality of seventh sealing members 45 connects the second wall 1122 and the fourth wall 1124, and a portion of the plurality of seventh sealing members 45 connects the fourth wall 1124 and the first wall 1121, and the plurality of seventh sealing members 45 may function to seal the gap at the connection of the first wall 1121 and the third wall 1123, the gap at the connection of the second wall 1122 and the fourth wall 1124, and the gap at the connection of the fourth wall 1124 and the first wall 1121, reduce the risk of gas or liquid leaking from the first space 111 through the plurality of gaps, and reduce the risk of foreign materials from the first space 111 entering the first space 111 through the plurality of gaps, thereby reducing the risk of contaminating the electrical core assembly 20.

In an embodiment, the seventh seal 45 comprises foam, and optionally, the seventh seal 45 comprises waterproof foam.

In one embodiment, the seventh sealing member 45 is formed by applying a sealant to a joint between two

adjacent walls

1121, 1122, 1123, and 1124 and then curing the sealant. In one embodiment, the sealant includes, but is not limited to, any of epoxy, thermally conductive silicone, silicone adhesive, hot melt adhesive, and polyvinyl compound.

Referring to fig. 3, fig. 7 and fig. 8, in an embodiment, the top wall 113 includes a first surface 11341 and a second surface 11342 opposite to each other, the first surface 11341 faces the first space 111, the second surface 11342 faces the second space 121, the first through hole 1131, the second through hole 1132 and the third through hole 1133 all penetrate through the first surface 11341 and the second surface 11342, and the fixing portion 1139 is disposed on the second surface 11342.

In one embodiment, the top wall 113 is provided with a first recess 11343, the first recess 11343 is provided on the first surface 11341, and the opening of the first recess 11343 faces the bottom wall 115. In one embodiment, portions of the first, second, third, and

fourth walls

1121, 1122, 1123, 1124 are inserted into the first recess 11343 such that the first, second, third, and

fourth walls

1121, 1122, 1123, 1124 are connected to the top wall 113.

In one embodiment, the electrochemical device 100 further includes a fifth seal (not shown) at least partially filling the first recess 11343 and contacting an inner wall connecting the first wall 1121, the second wall 1122, the third wall 1123, the fourth wall 1124 and the first recess 11343. The fifth sealing member can perform a sealing function, so as to reduce the risk of leakage of gas or liquid in the first space 111 through the gap at the joint of the peripheral wall 112 and the first recess 11343, and reduce the risk of impurities outside the first space 111 entering the first space 111 through the gap at the joint of the peripheral wall 112 and the first recess 11343, thereby contaminating the core assembly 20.

In one embodiment, the fifth sealing element is formed by filling the fifth sealant into the first recess 11343 and then curing the fifth sealing element. In one embodiment, the fifth sealant includes, but is not limited to, any one of epoxy, thermally conductive silicone, hot melt adhesive, and polyvinyl chloride.

In an embodiment, the top wall 113 is further provided with a second protrusion 1136, the second protrusion 1136 is disposed on the first surface 11341 and extends out of the first surface 11341, the first through hole 1131 penetrates through the second protrusion 1136, the second protrusion 1136 further limits the movement of the first terminal 51, the surface area of the inner wall of the first through hole 1131 is increased, and the sealing effect of the second sealant is improved.

In an embodiment, the top wall 113 is further provided with a third protrusion 1137, the third protrusion 1137 is disposed on the first surface 11341 and extends out of the first surface 11341, the second through hole 1132 penetrates through the third protrusion 1137, the third protrusion 1137 further limits the movement of the second terminal 52, the surface area of the inner wall of the second through hole 1132 is increased, and the sealing effect of the third sealant is improved.

In an embodiment, the top wall 113 further has a fourth protrusion 1138, the fourth protrusion 1138 is disposed on the first surface 11341 and extends out of the first surface 11341, the third through hole 1133 penetrates through the fourth protrusion 1138, the fourth protrusion 1138 further limits the movement of the first wire 55, the surface area of the inner wall of the third through hole 1133 is increased, and the sealing effect of the fourth sealant is improved.

Referring to fig. 3, 9 and 10 in combination, in one embodiment, the bottom wall 115 includes a third surface 11511 and a fourth surface 11512 that are opposite to each other, the third surface 11511 faces the first space 111, and the fourth surface 11512 faces away from the first space 111.

In one embodiment, the bottom wall 115 is provided with a second recess 11513, the second recess 11513 is provided on the third surface 11511, and the second recess 11513 opens toward the top wall 113. In one embodiment, portions of the first, second, third, and

fourth walls

1121, 1122, 1123, 1124 are inserted into the second recess 11513 such that the first, second, third, and

fourth walls

1121, 1122, 1123, 1124 are connected to the bottom wall 115.

In one embodiment, the electrochemical device 100 further includes a sixth seal (not shown) at least partially filling the second recess 11513 and contacting an inner wall connecting the first, second, third, fourth, and

second walls

1121, 1122, 1123, 1124, and 11513. The sixth sealing member can perform a sealing function, thereby reducing the risk of leakage of gas or liquid in the first space 111 through the gap at the junction between the peripheral wall 112 and the second concave portion 11513, and reducing the risk of foreign matters outside the first space 111 entering the first space 111 through the gap at the junction between the peripheral wall 112 and the second concave portion 11513.

In one embodiment, the sixth seal is formed by a sixth sealant that is cured after filling the second recess 11513. In one embodiment, the sixth sealant includes, but is not limited to, any one of epoxy, thermally conductive silicone, hot melt adhesive, and a polyvinyl compound.

In one embodiment, the third surface 11511 is coupled to the electrical core assembly 20 and is used to support the electrical core assembly 20. Optionally, the third surface 11511 is a plane, and the plane-shaped third surface 11511 can reduce the impact on the electric core assembly 20 when the electrochemical device 100 shakes.

In one embodiment, the bottom wall 115 is further provided with a first protrusion 1153, the first protrusion 1153 is disposed in the second recess 11513, and the first protrusion 1153 extends from the bottom wall 115 of the second recess 11513 to the direction of the top wall 113. The portion of the peripheral wall 112 extending into the second recess 11513 abuts against the first protrusion 1153, so that a gap exists between the peripheral wall 112 and the bottom wall 115 of the second recess 11513, the sixth sealing member filled in the second recess 11513 can be sufficiently contacted with the peripheral wall 112, and the risk that the sealing effect is affected due to the fact that the peripheral wall 112 and the second recess 11513 are tightly matched, and the storage amount of the sixth sealing member in the second recess 11513 is too small is reduced.

In one embodiment, there are a plurality of first protrusions 1153, a plurality of first protrusions 1153 are spaced apart from each other and disposed on the second recesses 11513, a portion of the first protrusions 1153 abuts the first wall 1121, a portion of the first protrusions 1153 abuts the second wall 1122, a portion of the first protrusions 1153 abuts the third wall 1123, and a portion of the first protrusions 1153 abuts the fourth wall 1124.

Referring to fig. 3 and 4, in an embodiment, the electrochemical device 100 further includes an interposer 60, the interposer 60 is disposed in the first space 111, and the interposer 60 is connected to a plurality of tabs 213 for electrically connecting the core assembly 20 and the circuit board 30. The adapter plate 60 is located between the cell housing 211 and the top wall 113, the adapter plate 60 electrically connects the plurality of cells 21 by connecting the plurality of tabs 213, the adapter plate 60 electrically connects the plurality of cells 21 to the circuit board 30 by connecting the first terminal 51 and the second terminal 52, and the adapter plate 60 electrically connects the plurality of cells 21 to the circuit board 30 by connecting the first harness 55.

In one embodiment, the interposer 60 includes a substrate 61 and a plurality of conductive members 62, the plurality of conductive members 62 are disposed on the substrate 61 in a first direction X, and the conductive members 62 are used for electrically connecting the tabs 213. In one embodiment, portions of plurality of conductive elements 62 are connected to first terminal 51. In one embodiment, portions of plurality of conductors 62 are connected to second terminal 52. In one embodiment, portions of plurality of conductive elements 62 are coupled to first harness 55. In one embodiment, the substrate 61 includes a Printed Circuit Board (PCB). In one embodiment, first harness 55 electrically connects plurality of conductive members 62 via wires within the PCB board.

In one embodiment, the conductive members 62 are integrally formed with the substrate 61. In an embodiment, the plurality of conductive members 62 are integrally formed with the substrate 61 by injection molding, and a part of the conductive members 62 is embedded in the substrate 61. The conductive member 62 is connected to the substrate 61 by injection molding, so that the working efficiency can be improved, and the manufacturing cost of the adapter plate 60 can be saved.

In one embodiment, a portion of the conductive member 62 is exposed on a side of the substrate 61 facing the top wall 113, the substrate 61 is provided with a fourth through hole 611, and the fourth through hole 611 is configured to allow the tab 213 to pass through the substrate 61, so that the tab 213 can extend out of the substrate 61 to be connected with the conductive member 62. In an embodiment, the number of the fourth through holes 611 is multiple, the multiple fourth through holes 611 are arranged at intervals along the first direction X, and optionally, each fourth through hole 611 allows one tab 213 to pass through.

In an embodiment, the conductive members 62 are disposed between two fourth through holes 611 adjacent to each other along the first direction X, and the tab 213 is bent toward the adjacent conductive member 62 after passing through the fourth through hole 611, and is connected to the conductive member 62 in a contact manner. In one embodiment, two tabs 213 adjacent to each other along the first direction X pass through the fourth through hole 611 and then are bent toward each other, and are connected to the same conductive member 62. In one embodiment, tab 213 is attached to conductor 62 by welding.

In an embodiment, the plurality of fourth through holes 611 includes two parts, and the two parts of the fourth through holes 611 are arranged at intervals along the second direction Y, so that both the tabs 213 on the same battery cell 21 can penetrate through the fourth through holes 611. In one embodiment, the plurality of conductive elements 62 includes two parts, and the two parts of the conductive elements 62 are spaced apart along the second direction Y, so that all the tabs 213 are electrically connected through the plurality of conductive elements 62.

Referring to fig. 2, fig. 3, fig. 4 and fig. 11, in an embodiment, the second casing 12 is provided with a first connection hole 127, the top wall 113 is provided with a second connection hole 116, the electrochemical device 100 further includes a fastener 80, and the fastener 80 connects the first connection hole 127 and the second connection hole 116, so that the second casing 12 is fixedly connected with the first casing 11. In one embodiment, the first connection hole 127 penetrates through the second housing 12 along the third direction Z, the second connection hole 116 includes a threaded hole, the fastener 80 includes a bolt, and a portion of the fastener 80 passes through the first connection hole 127 and then is threaded into the second connection hole 116. In an embodiment, the first connection hole 127 penetrates the ninth wall 126 along the third direction Z.

In one embodiment, the peripheral wall 112 is provided with a third connection hole 1120, and the fastening member 80 passes through the first connection hole 127 and is connected to the second connection hole 116 and the third connection hole 1120 to fixedly connect the peripheral wall 112, the top wall 113 and the second housing 12, thereby further improving the strength and sealing of the electrochemical device 100. Optionally, the first wall 1121 is provided with a third connection hole 1120. Optionally, the second wall 1122 is provided with a third connection hole 1120.

In one embodiment, the number of the first connecting holes 127, the second connecting holes 116 and the fasteners 80 is equal, and the positions of the first connecting holes 127 and the second connecting holes 116 correspond.

In one embodiment, the number of the first connecting holes 127, the second connecting holes 116, the third connecting holes 1120 and the fasteners 80 is equal, and the positions of the first connecting holes 127, the second connecting holes 116 and the third connecting holes 1120 correspond.

In one embodiment, the electrochemical device 100 further includes a connector 70, the connector 70 is detachably connected to the second casing 12, a portion of the connector 70 is located in the second space 121 and is detachably electrically connected to the circuit board 30, and a portion of the connector 70 extends out of the second casing 12 and out of the housing 10. The connector 70 can be an external interface of the electrochemical device 100 to connect with an external device to charge and discharge the electrochemical device 100, and optionally, the connector 70 is an aviation plug. In one embodiment, the connector 70 is connected to the eighth wall 125.

In one embodiment, the connector 70 is connected to the circuit board 30 by a plug-in connection, which not only facilitates assembly, but also facilitates removal for maintenance. In one embodiment, the connector 70 includes a third connector 71, and the third connector 71 is pluggable to the circuit board 30.

In an embodiment, the connecting member 70 is fixedly connected to the eighth wall 125 through a bolt, and the bolt connection not only can ensure the stability of the connecting member 70 connected to the eighth wall 125, but also can facilitate assembly and disassembly, thereby improving the working efficiency. In one embodiment, the connecting member 70 is connected to the eighth wall 125 by a snap-fit connection, which facilitates assembly and disassembly and improves work efficiency.

In one embodiment, the circuit board 30 includes a BMS (Battery Management System, BMS for short) module, and the BMS module includes a plurality of electronic components, and the plurality of electronic components can realize functions of data acquisition, control, protection, communication, power calculation, signal transmission, power transmission, and the like for the Battery cell 21.

Referring to fig. 2, 4, 12 and 13, in an embodiment, the circuit board 30 includes a first portion 31 and a second portion 32, and the first portion 31 and the second portion 32 are electrically connected to each other and can be detached from each other to release the physical connection and the electrical connection. In an embodiment, the first portion 31 and the second portion 32 are disposed opposite to each other at an interval along the third direction Z, and the circuit board 30 is formed by two portions disposed at an interval along the third direction Z, so that the space utilization rate of the second space 121 can be improved. In an embodiment, the first portion 31 and the second portion 32 are electrically connected in a plugging manner, so that the assembly and disassembly are convenient, and the working efficiency can be improved. In one embodiment, the second portion 32 is removably attached to the ninth wall 126. In one embodiment, the second portion 32 is detachably connected to the ninth wall 126 by screws, which facilitate assembly and disassembly, and improve work efficiency.

In an embodiment, the first sealing member 41 covers at least a part of the surface of the first portion 31, and the first sealing member 41 can play a role in protection, so as to reduce the influence of impurities entering the second space 121 on the first portion 31. In an embodiment, the first sealing member 41 covers at least a part of the surface of the second portion 32, and the first sealing member 41 can play a role in protection, so as to reduce the influence of impurities entering the second space 121 on the second portion 32.

In an embodiment, along the third direction Z, the first portion 31 is located between the second portion 32 and the top wall 113, and the second portion 32 is located between the first portion 31 and the ninth wall 126. In an embodiment, the second wire harness 56 is connected to the first portion 31, and optionally, the second wire harness 56 is electrically connected to the first portion 31 in a plugging manner, so that the assembly and disassembly are convenient, and the working efficiency can be improved.

In an embodiment, the area of the second portion 32 is larger than the area of the first portion 31 along the third direction Z, and the projection of the first portion 31 is located within the projection of the second portion 32. In one embodiment, when assembling the connecting circuit board 30 and the second housing 12, the first portion 31 and the second portion 32 can be inserted together, and then the inserted circuit board 30 is placed in the second space 121 with the second portion 32 close to the ninth wall 126, and the second portion 32 is fixedly connected to the ninth wall 126. When the second portion 32 and the ninth wall 126 are fixedly connected, the area of the first portion 31 is small, an operation space can be provided, and the risk that the first portion 31 interferes and the second portion 32 and the ninth wall 126 are connected is reduced.

In one embodiment, when assembling the connection circuit board 30 and the second housing 12, the second portion 32 can be first placed in the second space 121 and fixedly connected to the ninth wall 126, and then the first portion 31 can be placed in the second space 121 and connected to the second portion 32. This mounting arrangement has no particular requirements on the area of the first portion 31 and the second portion 32, and the effect of the relative size of the first portion 31 and the second portion 32 on the design of the circuit board 30 can be reduced.

To sum up, in the electrochemical device 100 of the present application, the outer shell 10 is used for sealing and protecting the electric core assembly 20 through the first casing 11, and at least part of the components on the circuit board 30 is covered and protected through the first sealing member 41 in the second casing 12, so that the protection performance of the electrochemical device 100 can be improved, and the influence of impurities in the external environment on the electrochemical device 100 can be reduced.

As shown in fig. 14, an electric device 200 according to an embodiment of the present application further includes the electrochemical device 100 according to any of the above embodiments, and the electrochemical device 100 is capable of providing electric energy for the electric device 200.

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

In the electric equipment 200 of the present application, the electrochemical device 100 can adapt to a complex working condition environment, such as a corrosive liquid environment or a sand wind environment, and can reduce the influence of the external environment on the electrochemical device 100, and reduce the influence of the performance loss of the electrochemical device 100 on the electric equipment 200 due to the complex environment.

In addition, other changes may be made by those skilled in the art within the spirit of the present disclosure, and it is understood that all changes that come within the spirit of the disclosure are to be embraced therein.

Claims

1. An electrochemical device, comprising:

the shell comprises a first shell and a second shell which are connected with each other, the first shell is provided with a closed first space, a second space is formed between the second shell and the first shell, and the second space is isolated from the first space;

the electric core assembly is arranged in the first space;

the circuit board is arranged in the second space and can be electrically connected to the electric core assembly, and the circuit board comprises a plurality of components;

and a first sealing member provided in the second space and covering at least a part of the plurality of components.

2. The electrochemical device according to claim 1,

the first shell comprises a top wall, the top wall is provided with a first through hole, and the first through hole penetrates through the top wall;

the electrochemical device further includes:

the part of the first terminal is accommodated in the first space and connected to the electric core assembly, and the part of the first terminal penetrates through the first through hole and extends into the second space so as to be connected with the circuit board;

and a second sealing member at least partially filling the first through hole and connecting the first terminal and the top wall.

3. The electrochemical device of claim 2, further comprising a third terminal, a portion of said third terminal being received in said second space and connected to said circuit board, said third terminal being connected to said first terminal.

4. The electrochemical device of claim 1,

the first shell comprises a top wall, the top wall is provided with a third through hole, and the third through hole penetrates through the top wall;

the electrochemical device further includes:

the part of the wire harness is accommodated in the first space and electrically connected with the electric core assembly, the part of the wire harness penetrates through the third through hole and extends into the second space so as to be connected with the circuit board, and the wire harness can acquire electric signal information of the electric core assembly;

and a fourth sealing member at least partially filling the third through hole and connecting the wire harness and the top wall.

5. The electrochemical device of claim 1 further comprising a connector removably coupled to said second housing, a portion of said connector being positioned within said second space and removably coupled to said circuit board, a portion of said connector extending out of said second housing.

6. The electrochemical device of claim 1, wherein said circuit board comprises a first portion and a second portion, said first portion and said second portion being detachably connected to each other;

the first seal covers at least part of the first portion and/or the first seal covers at least part of the second portion.

7. The electrochemical device of claim 1,

the first shell comprises a peripheral wall, a top wall and a bottom wall, wherein the peripheral wall is connected with the top wall and the bottom wall;

the top wall is provided with a first concave part, and part of the peripheral wall is accommodated in the first concave part;

the electrochemical device further comprises a fifth sealing member at least partially filling the first recess, the fifth sealing member disposed in the first recess connecting the peripheral wall and an inner wall of the first recess.

8. The electrochemical device according to claim 1,

the bottom wall is provided with a second concave part, and part of the peripheral wall is accommodated in the second concave part;

the electrochemical device further includes a sixth seal disposed in the second recess, the sixth seal connecting the peripheral wall and the bottom wall.

9. The electrochemical device according to claim 8, wherein a side of the bottom wall facing the first space is further provided with a first protrusion, the first protrusion is provided in the second recess, the first protrusion extends from a surface of the bottom wall toward the first space, and the peripheral wall abuts against the first protrusion.

10. The electrochemical device according to any one of claims 7 to 9,

the peripheral wall includes a first wall, a second wall, a third wall, and a fourth wall, the top wall and the bottom wall each connecting the first wall, the second wall, the third wall, and the fourth wall;

the electrochemical device further includes a plurality of seventh seals, a portion of the plurality of seventh seals connecting the first wall and the second wall, a portion of the plurality of seventh seals connecting the second wall and the third wall, a portion of the plurality of seventh seals connecting the third wall and the fourth wall, and a portion of the plurality of seventh seals connecting the first wall and the fourth wall.

11. The electrochemical device according to any one of claims 7 to 9, wherein said second case and said top wall form said second space.

12. The electrochemical device according to any one of claims 7 to 9, wherein the second case is provided with a first connecting hole, the top wall is provided with a second connecting hole, and the peripheral wall is provided with a third connecting hole, and further comprising a fastening member passing through the first connecting hole, the second connecting hole, and the third connecting hole.

13. An electrical consumer comprising an electrochemical device according to any one of claims 1 to 12.