WO2024078497A1

WO2024078497A1 - Electrochemical apparatus and electric device

Info

Publication number: WO2024078497A1
Application number: PCT/CN2023/123800
Authority: WO
Inventors: 彭芳桂; 刘小平; 杨鹏程
Original assignee: 厦门新能达科技有限公司
Priority date: 2022-10-14
Filing date: 2023-10-10
Publication date: 2024-04-18
Also published as: CN115663367A

Abstract

An electrochemical appratus and an electric device. The electrochemical apparatus comprises a shell, a battery cell assembly, a circuit board and a first sealing member. The shell comprises a first housing and a second housing which are connected to each other, wherein the first housing is provided with a closed first space, the second housing and the first housing are connected to form a second space, and the second space is isolated from the first space. The battery cell assembly is arranged in the first space. The circuit board is arranged in the second space and is electrically connected to the battery cell assembly, and the circuit board comprises a plurality of components. The first sealing member is arranged in the second space and covers at least portion of the plurality of components. In the electrochemical apparatus, the shell hermetically protects the battery cell assembly by means of the first housing, and at least partially covers and protects the components on the circuit board by means of the first sealing member inside the second housing, such that the protection performance of the electrochemical apparatus can be improved, thereby reducing the influence of impurities in an external environment on the electrochemical apparatus.

Description

Electrochemical devices and electrical equipment

Technical Field

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

Background technique

At present, with the rapid development of new energy batteries, new energy batteries are applied to more and more industries. In some complex working conditions, the electrochemical device containing the battery module may come into contact with liquid, even corrosive liquid. If the liquid extends into the electrochemical device, it will seriously affect the normal use of the electrochemical device.

Summary of the invention

In view of the above situation, it is necessary to provide an electrochemical device that can reduce the impact of the external environment on the electrochemical device.

An embodiment of the present application provides an electrochemical device, including a housing, a battery cell assembly, a circuit board, and a first seal. The housing includes a first shell and a second shell connected to 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 battery cell assembly is arranged in the first space. The circuit board is arranged in the second space and is electrically connected to the battery cell assembly, and the circuit board includes a plurality of components. The first seal is arranged in the second space and covers at least part of the plurality of components.

In the above-mentioned electrochemical device, the shell seals and protects the battery cell assembly through the first shell, and at least partially covers and protects the components on the circuit board through the first seal in the second shell, which can improve the protection performance of the electrochemical device and reduce the impact of debris in the external environment on the electrochemical device.

In some embodiments of the present application, the first housing includes a top wall, the top wall is provided with a first through hole, and the first through hole passes through the top wall. The electrochemical device also includes a first terminal and a second seal. A portion of the first terminal is accommodated in the first space and connected to the battery cell assembly, and a portion of the first terminal passes through the first through hole and extends into the second space to connect to the circuit board. The second seal at least partially fills the first through hole and connects the first terminal and the top wall.

The first terminal enables the battery cell assembly in the first space to be connected to the circuit board in the second space, and the second sealant can reduce the risk of foreign matter entering the first space or the second space through the 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 the positive electrode connection terminal and the negative electrode connection terminal of the battery cell assembly, and is used for input and output of electric energy of the battery 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 (Bordeaux Management System) components include multiple electronic components, which can realize functions such as data collection, control, protection, communication, power calculation, signal transmission, and power transmission of battery cells.

In some embodiments of the present application, the first housing includes a top wall, the top wall is provided with a third through hole, and the third through hole passes through the top wall. The electrochemical device also includes a wiring harness and a fourth seal, part of the wiring harness is accommodated in the first space and electrically connected to the battery cell assembly, part of the wiring harness passes through the third through hole and extends into the second space to connect to the circuit board, the wiring harness can obtain electrical signal information of the battery cell assembly, at least part of the fourth seal is filled in the third through hole, and connects the wiring harness and the top wall.

The wiring harness enables the circuit board to obtain the electrical signal information of the battery cell assembly, and the fourth sealant can reduce the risk of foreign matter entering the first space or the second space through the gap between the wiring harness and the inner wall of the third through hole.

In some embodiments of the present application, the electrochemical device further comprises a connector which is detachably connected to the second shell, a portion of which is located in the second space and detachably connected to the circuit board, and a portion of which extends out of the second shell.

The connecting piece enables the electrochemical device to be electrically connected to an external device, and is detachably connected to the second housing, so that assembly and removal are facilitated, thereby improving work efficiency.

In some embodiments of the present application, the circuit board includes a first part and a second part, and the first part and the second part are detachably connected to each other to facilitate assembly and disassembly, and improve space utilization within the second shell; the first seal covers at least part of the first part, and/or the first seal covers at least part of the second part. The first seal can improve the protective performance of the circuit board and reduce the risk of the circuit board being contaminated by external debris.

In some embodiments of the present application, the first shell includes a peripheral wall, a top wall and a bottom wall, the peripheral wall connects the top wall and the bottom wall, and the edge of the top wall extends out of the peripheral wall, which is conducive to the fixed connection between 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 connects the top wall and the bottom wall; the top wall is provided with a first recess, and part of the peripheral wall is accommodated in the first recess; the electrochemical device further includes a fifth seal, the fifth seal at least partially fills the first recess, and the fifth seal provided in the first recess connects the peripheral wall and the inner wall of the first recess. The fifth seal can play a sealing role, reduce the risk of gas or liquid in the first space leaking out through the gap at the connection between the peripheral wall and the first recess, and reduce the risk of debris outside the first space entering the first space through the gap at the connection between the peripheral wall and the first recess, thereby contaminating the battery cell assembly.

In some embodiments of the present application, the first shell includes a peripheral wall, a top wall and a bottom wall, the peripheral wall connects the top wall and the bottom wall; the bottom wall is provided with a second recess, and a portion of the peripheral wall is accommodated in the second recess; the electrochemical device further includes a sixth seal, the sixth seal is provided in the second recess, and the sixth seal connects the peripheral wall and the bottom wall. The sixth seal can play a sealing role, reduce the risk of gas or liquid in the first space leaking out through the gap at the connection between the peripheral wall and the second recess, and reduce the risk of debris outside the first space entering the first space through the gap at the connection between the peripheral wall and the second recess.

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

In some embodiments of the present application, the peripheral wall includes a first wall, a second wall, a third wall and a fourth wall, and the top wall and the bottom wall are both connected to the first wall, the second wall, the third wall and the fourth wall; the electrochemical device also includes a plurality of seventh seals, a portion of the plurality of seventh seals connects the first wall and the second wall, a portion of the plurality of seventh seals connects the second wall and the third wall, a portion of the plurality of seventh seals connects the third wall and the fourth wall, and a portion of the plurality of seventh seals connects the first wall and the fourth wall.

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

In some embodiments of the present application, the second shell is provided with a first connection hole, the top wall is provided with a second connection hole, the peripheral wall is provided with a third connection hole, and the electrochemical device further includes a fastener passing through the first connection hole, the second connection hole and the third connection hole.

In one embodiment, the electrochemical device further comprises a first wiring harness, a portion of which is accommodated in the first space and used to connect the battery cell assembly, and a portion of the first wiring harness extends into the second space to connect the circuit board. The circuit board can obtain electrical signal information of the battery cells in the battery cell assembly through the first wiring harness.

In some embodiments of the present application, a fixing portion is also provided on the top wall, and the fixing portion is provided on the surface of the top wall and is located in the second space. The fixing portion can be used to connect the first wiring harness and/or the second wiring harness to limit the movement of the first wiring harness and/or the second wiring harness and reduce the impact of the shaking of the electrochemical device on the first wiring harness and/or the second wiring harness.

An embodiment of the present application further provides an electrical equipment, comprising the electrochemical device described in any one of the aforementioned embodiments.

In the above-mentioned electrical equipment, the electrochemical device has good protection performance, which can reduce the impact on the electrical equipment caused by foreign matter in the external environment entering the electrochemical device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of an electrochemical device in one embodiment of the present application.

FIG. 2 is a schematic structural diagram of the electrochemical device shown in FIG. 1 in a state where the first shell and the second shell are separated.

FIG. 3 is an exploded view of the first housing and internal structure of the electrochemical device shown in FIG. 1 .

FIG. 4 is an exploded view of the second housing and internal structure of the electrochemical device shown in FIG. 1 .

FIG. 5 is a schematic diagram of the structure of a battery cell in an embodiment of the present application.

FIG. 6 is a schematic diagram of the structure of the battery cell shown in FIG. 5 before packaging.

FIG. 7 is a first view of a top wall in one embodiment of the present application.

FIG. 8 is a second view of the top wall in one embodiment of the present application.

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

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

FIG. 11 is a schematic diagram of a second shell and internal structure of the electrochemical device shown in FIG. 1 .

FIG. 12 is a schematic diagram of the structure of a circuit board in one 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 the structure of an electrical device in an embodiment of the present application.

Main Component Symbols Electrochemical Device 100
Housing 10
First housing 11
First Space 111
Peripheral wall 112
The third connecting hole 1120
First Wall 1121
Second Wall 1122
The Third Wall 1123
The Fourth Wall 1124
Top wall 113
First through hole 1131
Second through hole 1132
The third through hole 1133
First surface 11341
Second surface 11342
First concave portion 11343
Second convex part 1136
Third convex part 1137
Fourth convex part 1138
Fixed part 1139
Bottom wall 115
Third surface 11511
Fourth Surface 11512
Second concave portion 11513
First convex part 1153
Second connection hole 116
Second housing 12
Second Space 121
The Fifth Wall 122
The Sixth Wall 123
The Seventh Wall 124
The Eighth Wall 125
The Ninth Wall 126
First connection hole 127
Battery Cell Components 20
Battery Cell 21
Battery housing 211
First battery cell shell 2111
Second cell housing 2112
Main body 2113
Edge Banding 2114
Top edge 21141
Side sealing 21142
Electrode assembly 212
Tab 213
Positive electrode ear 2131
Negative ear 2132
Circuit board 30
Part 1 31
Part 2 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 harness 55
First connector 551
Second wiring harness 56
Second connector 561
Adapter plate 60
Substrate 61
Fourth through hole 611
Conductive parts 62
Connectors 70
Third connector 71
Fasteners 80
Electrical equipment 200
First direction X
Second direction Y
The third direction Z

The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings.

Detailed ways

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 of the embodiments.

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 disposed element at the same time. 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 disposed element at the same time.

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

An embodiment of the present application provides an electrochemical device, including a housing, a battery cell assembly, a circuit board, and a first seal. The housing includes a first shell and a second shell connected to each other, the first shell is provided with a closed first space, the second shell and the first shell form a second space, and the second space is isolated from the first space. The battery cell assembly is arranged in the first space. The circuit board is arranged in the second space and is electrically connected to the battery cell assembly, and the circuit board includes a plurality of components. The first seal is arranged in the second space and covers at least part of the plurality of components.

The embodiments of the present application are further described below in conjunction with the accompanying drawings.

As shown in FIG. 1 and FIG. 2 , an embodiment of the present application provides an electrochemical device 100 , including a housing 10 , wherein the housing 10 includes a first shell 11 and a second shell 12 , and the first shell 11 and the second shell 12 are connected to each other.

In one embodiment, the first shell 11 and the second shell 12 can be detached from each other. When the first shell 11 and the second shell 12 are disconnected, the first shell 11 and the second shell 12 can be used as two independent modules. When any one of the modules has a problem and needs to be replaced or maintained, by detaching and replacing the first shell 11 and the second shell 12, work efficiency can be improved and maintenance costs can be reduced. In one embodiment, the first shell 11 and the second shell 12 are connected by bolts, which can improve the connection tightness of the first shell 11 and the second shell 12 and improve the protection capability of the housing 10. In one embodiment, the first shell 11 and the second shell 12 are connected by snap-fit. In one embodiment, the first shell 11 and the second shell 12 are bonded by a sealant, which can not only fix the connection between the first shell 11 and the first shell 12, but also fix the connection between the first shell 11 and the second shell 12. The second shell 12 can also play a sealing role to reduce the risk of debris outside the outer shell 10 entering the inner part of the outer shell 10 through the gap between the first shell 11 and the second shell 12. Optionally, a sealant is applied to the connecting surface area of the first shell 11 and the second shell 12. Optionally, the sealant includes but is not limited to any one of epoxy resin, thermal conductive silicone, silicone glue, hot melt adhesive and polyolefin compound.

As shown in Fig. 2, Fig. 3 and Fig. 4, the first housing 11 is provided with a closed first space 111, and 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 connected.

The electrochemical device 100 also includes a battery cell assembly 20, a circuit board 30 and a first seal 41. The battery cell assembly 20 is arranged in the first space 111, and the circuit board 30 and the first seal 41 are arranged in the second space 121. The battery cell assembly 20 and the circuit board 30 are electrically connected. The circuit board 30 includes multiple components, and the first seal 41 covers at least part of the multiple components.

In the electrochemical device 100 of the present application, the housing 10 seals and protects the battery cell assembly 20 through the first shell 11, and at least partially covers and protects the components on the circuit board 30 through the first seal 41 in the second shell 12, which can improve the protection performance of the electrochemical device 100 and reduce the impact of debris in the external environment on the battery cell assembly 20 and the components on the circuit board 30.

In one embodiment, the battery cell assembly 20 includes a plurality of battery cells 21 , and the plurality of battery cells 21 are stacked in sequence.

In one embodiment, the first sealing member 41 is formed by curing a first sealant applied to the surface of the circuit board 30. In one embodiment, the first sealant includes but is not limited to any one of epoxy resin, thermal conductive silica gel, silicone glue, hot melt glue and polyolefin compound.

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 are arranged to form a first space 111. The top wall 113 and the bottom wall 115 are arranged opposite to each other along the third direction Z, and the first housing 11 and the second housing 12 are arranged opposite to each other along the third direction Z.

In one embodiment, the edge of the top wall 113 extends out of the peripheral wall 112 , which is beneficial for the fixed connection between the top wall 113 and 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 arranged opposite to each other along the first direction X. The third wall 1123 and the fourth wall 1124 are arranged opposite to each other 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. 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 one 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 one embodiment, the peripheral wall 112 is formed by sequentially connecting the first wall 1121, the second wall 1122, the third wall 1123 and the fourth wall 1124 by welding. The first wall 1121 is connected to the third wall 1123 and the fourth wall 1124 by welding, and the second wall 1122 is connected to the third wall 1123 and the fourth wall 1124 by welding. The gap at the connection between the first wall 1121 and the third wall 1123, the gap at the connection between the second wall 1122 and the third wall 1123, and the gap at the connection between the third wall 1123 and the fourth wall 1124 are welded. The sealing of the gaps at the connection with the fourth wall 1124 and the gaps at the connection between the fourth wall 1124 and the first wall 1121 can reduce the risk of gas or liquid in the first space 111 leaking out through the above-mentioned gaps, and reduce the risk of debris outside the first space 111 entering the first space 111 through the above-mentioned gaps, thereby reducing the risk of contaminating the battery cell assembly 20.

In one embodiment, the second shell 12 is connected to the top wall 113 , the second shell 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 one embodiment, the top wall 113 is provided with a first through hole 1131 penetrating therethrough, and the first through hole 1131 can communicate with the first space 111 and the second space 121 .

In one embodiment, the top wall 113 is provided with a penetrating second through hole 1132 , and the second through hole 1132 can communicate with 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 accommodated in the first space 111 and is used to electrically connect the battery cell assembly 20. A portion of the first terminal 51 passes through the first through hole 1131 and extends into the second space 121 to connect the circuit board 30. The second terminal 52 is partially accommodated in the first space 111 and is used to electrically connect the battery cell assembly 20. A portion of the second terminal 52 passes through the second through hole 1132 and extends into the second space 121 to connect the circuit board 30. The first terminal 51 and the second terminal 52 enable the battery cell assembly 20 to be electrically connected to the circuit board 30, and the battery cell assembly 20 can be charged and discharged 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 the positive connection terminal of the battery cell assembly 20 , and the other is the negative connection terminal of the battery cell assembly 20 . The first terminal 51 and the second terminal 52 are used for input and output of electrical energy of the battery cell assembly 20 .

In one embodiment, the electrochemical device 100 further includes a second seal 42. In one embodiment, the electrochemical device 100 further includes a third seal 43. The second seal 42 is at least partially filled in the first through hole 1131. The second seal 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. The second seal 42 can play a sealing role, reduce the risk of gas or liquid in the first space 111 leaking through the gap between the first terminal 51 and the inner wall of the first through hole 1131, and reduce the risk of debris outside the first space 111 entering the first space 111 through the gap between the first terminal 51 and the inner wall of the first through hole 1131. The third sealant 43 at least partially fills the second through hole 1132. The third sealant 43 filled in the second through hole 1132 connects the second terminal 52 and the inner wall of the second through hole 1132, and fills the gap between the second terminal 52 and the inner wall of the second through hole 1132. The third sealant 43 can play a sealing role, reduce the risk of gas or liquid in the first space 111 leaking through the gap between the second terminal 52 and the inner wall of the second through hole 1132, and reduce the risk of debris outside the first space 111 entering the first space 111 through the gap between the second terminal 52 and the inner wall of the second through hole 1132.

In one embodiment, the second sealing member 42 is formed by curing the gap between the first terminal 51 and the inner wall of the first through hole 1131 after the second sealing glue is filled. Limited to any one of epoxy resin, thermal conductive silicone, silicone glue, hot melt adhesive and polyolefin compound.

In one embodiment, the third sealing member 43 is formed by curing a third sealant that is filled in the gap between the second terminal 52 and the inner wall of the second through hole 1132. In one embodiment, the third sealant includes but is not limited to any one of epoxy resin, thermal conductive silicone, silicone glue, hot melt adhesive and polyolefin compound.

In one embodiment, the electrochemical device 100 further includes 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 battery cell 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 battery cell assembly 20, and the battery cell assembly 20 is electrically connected to the circuit board 30 by connecting the first terminal 51 to the third terminal 53 and the second terminal 52 to the fourth terminal 54.

In one embodiment, the first terminal 51, the second terminal 52, the third terminal 53 and the fourth terminal 54 are elastically deformable flexible structures. Before the first shell 11 and the second shell 12 are connected together, the first terminal 51 is first connected to the third terminal 53, and the second terminal 52 is connected to the fourth terminal 54, and then the first shell 11 and the second shell 12 are connected together. Through the elastic deformation of the first terminal 51, the second terminal 52, the third terminal 53 and the fourth terminal 54, the influence of the relative movement of the first shell 11 and the second shell 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, thereby reducing the risk of failure of the connection between the first terminal 51 and the third terminal 53 and the risk of failure of the connection between the second terminal 52 and the fourth terminal 54.

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

In one embodiment, the electrochemical device 100 further includes a first wiring harness 55 , which is partially accommodated in the first space 111 and used to connect the battery cell assembly 20 , and partially passes through the third through hole 1133 and extends into the second space 121 to electrically connect the circuit board 30 .

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

In one embodiment, the first wiring harness 55 includes a first connector 551, and the second wiring harness 56 includes a second connector 561. The first connector 551 and the second connector 561 are pluggable and connected. The first wiring harness 55 and the second wiring harness 56 are connected through the pluggable and pluggable connectors, which can improve connection efficiency and shorten assembly time.

In one embodiment, the first wiring harness 55 and the second wiring harness 56 are deformable flexible structures. Before the first shell 11 and the second shell 12 are connected together, the first wiring harness 55 and the second wiring harness 56 are first plugged and connected, and then the first shell 11 and the second shell 12 are connected together. Through the elastic deformation of the first wiring harness 55 and the second wiring harness 56, the influence of the relative movement of the first shell 11 and the second shell 12 on the connection between the first wiring harness 55 and the second wiring harness 56 can be reduced, thereby reducing the risk of failure of the connection between the first wiring harness 55 and the second wiring harness 56.

In one embodiment, the top wall 113 is further provided with a fixing portion 1139, which is provided on the surface of the top wall 113 and is located in the second space 121. The fixing portion 1139 can be used to connect the first wire harness 55 and/or the second wire harness 56 to limit the movement of the first wire harness 55 and/or the second wire harness 56, and reduce the impact of the 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, and the buckle has an elastic opening. The first wire harness 55 and/or the second wire harness 56 can be accommodated and released through the elastic deformation of the buckle opening. Optionally, part of the second wire harness 56 is connected to the fixing portion 1139.

In one embodiment, the electrochemical device 100 also includes a fourth seal 44, which is at least partially filled in the third through hole 1133. The fourth seal 44 filled in the third through hole 1133 connects the first wiring harness 55 and the inner wall of the third through hole 1133, and fills the gap between the first wiring harness 55 and the inner wall of the third through hole 1133. The fourth seal 44 can play a sealing role, reduce the risk of gas or liquid in the first space 111 leaking through the gap between the first wiring harness 55 and the inner wall of the third through hole 1133, and reduce the risk of debris outside the first space 111 entering the first space 111 through the gap between the first wiring harness 55 and the inner wall of the third through hole 1133, thereby reducing the risk of contaminating the battery cell assembly 20.

In one embodiment, the fourth sealing member 44 is formed by curing a fourth sealant after filling the gap between the first wiring harness 55 and the inner wall of the third through hole 1133. In one embodiment, the fourth sealant includes but is not limited to any one of epoxy resin, thermal conductive silica gel, silicone glue, hot melt glue and polyolefin compound.

In one embodiment, the second shell 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 arranged opposite to each other along a first direction X, the seventh wall 124 and the eighth wall 125 are arranged opposite to each other along a second direction Y, the ninth wall 126 and the top wall 113 are arranged opposite to each other along a third direction Z, 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 are all connected to 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 are arranged to form a second space 121.

As shown in Figures 5 and 6, in one embodiment, the battery cell 21 includes a battery cell shell 211, an electrode assembly 212 and a pole ear 213. The electrode assembly 212 is arranged inside the battery cell shell 211, a portion of the pole ear 213 is located in the battery cell shell 211 and connected to the electrode assembly 212, and a portion of the pole ear 213 extends out of the battery cell shell 211.

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

In one embodiment, the cell housing 211 includes a first cell housing 2111 and a second cell housing 2112 connected to each other. When the first cell housing 2111 and the second cell housing 2112 are folded toward each other and attached, an internal space capable of accommodating the electrode assembly 212 can be formed. In one embodiment, the cell housing 211 includes a first cell housing and a second cell housing (not shown) separated from each other. When the first cell housing and the second cell housing are attached toward each other, an internal space capable of accommodating the electrode assembly 212 can be formed.

In one embodiment, the battery cell housing 211 includes a main body 2113 and an edge sealing portion 2114 connected to each other. The edge sealing portion 2114 extends from the main body 2113. The electrode assembly 212 is accommodated in the main body 2113. The tab 213 extends out of the cell housing 211 from the edge seal 2114. The edge seal 2114 includes a top edge seal 21141 and a side edge seal 21142 connected to each other. The top edge seal 21141 is located at the end of the main body 2113 along the third direction Z, and the side edge seal 21142 is located at the end of the main body 2113 along the second direction Y. The tab 213 extends out of the cell housing 211 from the top edge seal 21141. In one embodiment, there are two side edge seals 21142, which are respectively located at the two opposite ends of the main body 2113 along the second direction Y, and the top edge seal 21141 is located between the two side edge seals 21142 and connects the two side edge seals 21142. The tab 213 includes a positive tab 2131 and a negative tab 2132. The positive tab 2131 is connected to the positive electrode sheet, and the negative tab 2132 is connected to the negative electrode sheet. In one embodiment, the positive electrode tab 2131 and the negative electrode tab 2132 are located on the same side of the battery cell housing 211. In one embodiment, the positive electrode tab 2131 and the negative electrode tab 2132 are located at opposite ends of the battery cell housing 211 (not shown).

As an example, the following further describes the case where the positive electrode tab 2131 and the negative electrode tab 2132 are located on the same side of the battery cell housing 211 .

Please refer to FIG. 2 , FIG. 3 and FIG. 7 , in one embodiment, a plurality of battery cells 21 are stacked in sequence along a first direction X.

In one embodiment, the electrochemical device 100 further includes a plurality of seventh seals 45, a portion of the plurality of seventh seals 45 connecting the first wall 1121 and the third wall 1123, a portion of the plurality of seventh seals 45 connecting the second wall 1122 and the third wall 1123, a portion of the plurality of seventh seals 45 connecting the second wall 1122 and the fourth wall 1124, and a portion of the plurality of seventh seals 45 connecting the fourth wall 1124 and the first wall 1121. The plurality of seventh seals 45 can play a sealing role, sealing the gaps at the connection between the first wall 1121 and the third wall 1123, the gaps at the connection between the second wall 1122 and the third wall 1123, the gaps at the connection between the second wall 1122 and the fourth wall 1124, and the gaps at the connection between the fourth wall 1124 and the first wall 1121, thereby reducing the risk of gas or liquid in the first space 111 leaking out through the above-mentioned gaps, and reducing the risk of debris outside the first space 111 entering the first space 111 through the above-mentioned gaps, thereby reducing the risk of contaminating the battery cell assembly 20.

In one embodiment, the seventh sealing member 45 includes foam. Optionally, the seventh sealing member 45 includes waterproof foam.

In one embodiment, the seventh sealing member 45 is formed by curing a sealant applied to the connection between two adjacent walls of the first wall 1121, the second wall 1122, the third wall 1123 and the fourth wall 1124. In one embodiment, the sealant includes but is not limited to any one of epoxy resin, thermal conductive silicone, silicone glue, hot melt glue and polyolefin compound.

Please refer to Figures 3, 7 and 8. In one embodiment, the top wall 113 includes a first surface 11341 and a second surface 11342 relative to each other, the first surface 11341 faces the first space 111, and 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 the first surface 11341 and the second surface 11342, and the fixing portion 1139 is provided 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 wall 1121, the second wall 1122, the third wall 1123, and the fourth wall 1124 are inserted into the first recess 11343, so that the first wall 1121, the second wall 1122, the third wall 1123, and the fourth wall 1124 are connected to the top wall 113.

In one embodiment, the electrochemical device 100 further includes a fifth seal (not shown), which at least partially fills the first recess 11343 and contacts and connects the first wall 1121, the second wall 1122, the third wall 1123, the fourth wall 1124 and the inner wall of the first recess 11343. The fifth seal can play a sealing role, reduce the risk of gas or liquid in the first space 111 leaking through the gap at the connection between the peripheral wall 112 and the first recess 11343, and reduce the risk of debris outside the first space 111 entering the first space 111 through the gap at the connection between the peripheral wall 112 and the first recess 11343, thereby contaminating the battery cell assembly 20.

In one embodiment, the fifth sealing member is formed by curing a fifth sealant filled into the first recess 11343. In one embodiment, the fifth sealant includes but is not limited to any one of epoxy resin, thermal conductive silica gel, silicone glue, hot melt glue and polyolefin compound.

In one embodiment, the top wall 113 is further provided with a second protrusion 1136, which is provided on the first surface 11341 and extends out of the first surface 11341. The first through hole 1131 passes through the second protrusion 1136. The second protrusion 1136 further limits the movement of the first terminal 51, increases the surface area of the inner wall of the first through hole 1131, and improves the sealing effect of the second sealant.

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

In one embodiment, the top wall 113 is further provided with a fourth protrusion 1138, which is provided on the first surface 11341 and extends out of the first surface 11341. The third through hole 1133 passes through the fourth protrusion 1138. The fourth protrusion 1138 further limits the movement of the first wiring harness 55, increases the surface area of the inner wall of the third through hole 1133, and improves the sealing effect of the fourth sealant.

Please refer to FIG. 3 , FIG. 9 and FIG. 10 . In one embodiment, the bottom wall 115 includes a third surface 11511 and a fourth surface 11512 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 opening of the second recess 11513 faces the top wall 113. In one embodiment, portions of the first wall 1121, the second wall 1122, the third wall 1123, and the fourth wall 1124 are inserted into the second recess 11513, so that the first wall 1121, the second wall 1122, the third wall 1123, and the fourth wall 1124 are connected to the bottom wall 115.

In one embodiment, the electrochemical device 100 further includes a sixth seal (not shown), which at least partially fills the second recess 11513 and contacts and connects the first wall 1121, the second wall 1122, the third wall 1123, the fourth wall 1124, and the inner wall of the second recess 11513. The sixth seal can play a sealing role, reduce the risk of gas or liquid in the first space 111 leaking through the gap at the connection between the peripheral wall 112 and the second recess 11513, and reduce the risk of debris outside the first space 111 entering the first space 111 through the gap at the connection between the peripheral wall 112 and the second recess 11513.

In one embodiment, the sixth sealing member is formed by curing the sixth sealant after filling it into the second recess 11513. In one embodiment, the sixth sealant includes but is not limited to any one of epoxy resin, thermal conductive silica gel, silicone glue, hot melt glue and polyolefin compound.

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

In one embodiment, the bottom wall 115 is further provided with a first convex portion 1153, which is provided in the second concave portion 11513 and extends from the bottom wall 115 of the second concave portion 11513 toward the top wall 113. The portion of the peripheral wall 112 extending into the second concave portion 11513 abuts against the first convex portion 1153, so that there is a gap between the peripheral wall 112 and the bottom wall 115 of the second concave portion 11513, so that the sixth sealing member filled in the second concave portion 11513 can fully contact the peripheral wall 112, thereby reducing the risk of the peripheral wall 112 and the second concave portion 11513 fitting tightly, resulting in too little sixth sealing member in the second concave portion 11513 affecting the sealing effect.

In one embodiment, there are multiple first protrusions 1153, and the multiple first protrusions 1153 are arranged in the second recess 11513 at intervals from each other. Some of the first protrusions 1153 abut against the first wall 1121, some of the first protrusions 1153 abut against the second wall 1122, some of the first protrusions 1153 abut against the third wall 1123, and some of the first protrusions 1153 abut against the fourth wall 1124.

Please refer to FIG. 3 and FIG. 4 . In one embodiment, the electrochemical device 100 further includes an adapter plate 60, which is disposed in the first space 111. The adapter plate 60 is connected to a plurality of tabs 213 and is used to electrically connect the battery cell assembly 20 and the circuit board 30. The adapter plate 60 is located between the battery cell housing 211 and the top wall 113. The adapter plate 60 electrically connects a plurality of battery cells 21 by connecting a plurality of tabs 213. The adapter plate 60 electrically connects a plurality of battery cells 21 to the circuit board 30 by connecting a first terminal 51 and a second terminal 52. The adapter plate 60 electrically connects a plurality of battery cells 21 to the circuit board 30 by connecting a first wiring harness 55.

In one embodiment, the adapter board 60 includes a substrate 61 and a plurality of conductive members 62, and the plurality of conductive members 62 are arranged on the substrate 61 along the first direction X, and the conductive members 62 are used to electrically connect the pole ear 213. In one embodiment, some of the plurality of conductive members 62 are connected to the first terminal 51. In one embodiment, some of the plurality of conductive members 62 are connected to the second terminal 52. In one embodiment, some of the plurality of conductive members 62 are connected to the first wiring harness 55. In one embodiment, the substrate 61 includes a PCB (Printed Circuit Board, PCB for short). In one embodiment, the first wiring harness 55 is electrically connected to the plurality of conductive members 62 through wires in the PCB.

In one embodiment, the plurality of conductive members 62 are integrally formed with the substrate 61. In one embodiment, the plurality of conductive members 62 are integrally formed with the substrate 61 by injection molding, and a portion of the conductive member 62 is embedded in the substrate 61. The conductive member 62 is connected to the substrate 61 by injection molding, which can improve work efficiency and save the manufacturing cost of the adapter plate 60.

In one embodiment, part of the conductive member 62 is exposed on the side of the substrate 61 facing the top wall 113, and the substrate 61 is provided with a fourth through hole 611, and the fourth through hole 611 can allow the pole lug 213 to pass through the substrate 61, so that the pole lug 213 can extend out of the substrate 61 to connect with the conductive member 62. In one embodiment, there are multiple fourth through holes 611, and the multiple fourth through holes 611 are arranged at intervals along the first direction X. Optionally, each fourth through hole 611 allows one pole lug 213 to pass through.

In one embodiment, the conductive member 62 is disposed between two adjacent fourth through holes 611 along the first direction X. After passing through the fourth through hole 611, the tab 213 is bent toward the adjacent conductive member 62 and is aligned with the conductive member 62. In one embodiment, two adjacent tabs 213 along the first direction X pass through the fourth through hole 611 and then bend toward each other and are connected to the same conductive member 62. In one embodiment, the tabs 213 are connected to the conductive member 62 by welding.

In one embodiment, the plurality of fourth through holes 611 include two parts, and the two parts of the fourth through holes 611 are arranged at intervals along the second direction Y, so that the two tabs 213 on the same battery cell 21 can pass through the fourth through holes 611. In one embodiment, the plurality of conductive members 62 include two parts, and the two parts of the conductive members 62 are arranged at intervals along the second direction Y, so that all the tabs 213 are electrically connected through the plurality of conductive members 62.

Please refer to FIG. 2, FIG. 3, FIG. 4 and FIG. 11 in combination. In one embodiment, the second housing 12 is provided with a first connection hole 127, and 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 housing 12 is fixedly connected to the first housing 11. In one embodiment, the first connection hole 127 penetrates the second housing 12 along the third direction Z, the second connection hole 116 includes a threaded hole, and the fastener 80 includes a bolt, and a portion of the fastener 80 passes through the first connection hole 127 and is threadedly connected to the second connection hole 116. In one 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 fastener 80 passes through the first connection hole 127 and is connected to the second connection hole 116 and the third connection hole 1120, so as to fix the peripheral wall 112, the top wall 113 and the second shell 12, and further improve 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 connection holes 127 , the second connection holes 116 , and the fasteners 80 are equal, and the positions of the first connection holes 127 and the second connection holes 116 correspond.

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

In one embodiment, the electrochemical device 100 further includes a connector 70, which is detachably connected to the second housing 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 housing 12 and the housing 10. The connector 70 can serve as 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 plugging, which is not only convenient for assembly, but also easy to remove during maintenance. In one embodiment, the connector 70 includes a third connector 71, which is pluggable and pluggable to the circuit board 30.

In one embodiment, the connecting member 70 is fixedly connected to the eighth wall 125 by bolts, which can not only ensure the stability of the connecting member 70 connected to the eighth wall 125, but also facilitate assembly and removal, thereby improving work efficiency. In one embodiment, the connecting member 70 is connected to the eighth wall 125 by snap-fitting, which is convenient for assembly and removal, thereby improving work efficiency.

In one embodiment, the circuit board 30 includes a BMS (Battery Management System, abbreviated as The BMS assembly includes a plurality of electronic components, which can realize functions such as data collection, control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21.

Please refer to Figures 2, 4, 12 and 13. In one embodiment, the circuit board 30 includes a first part 31 and a second part 32, which are electrically connected to each other and can be detached from each other to release the physical connection and electrical connection. In one embodiment, the first part 31 and the second part 32 are relatively arranged at intervals along the third direction Z, and the circuit board 30 is composed of two parts arranged at intervals along the third direction Z, which can improve the space utilization rate of the second space 121. In one embodiment, the first part 31 and the second part 32 are electrically connected by plugging, which is convenient for assembly and removal and can improve work efficiency. In one embodiment, the second part 32 is detachably connected to the ninth wall 126. In one embodiment, the second part 32 is detachably connected to the ninth wall 126 by screws, and the screw connection is convenient for assembly and removal and can improve work efficiency.

In one embodiment, the first seal 41 covers at least part of the surface of the first portion 31, and the first seal 41 can play a protective role, reducing the impact of debris entering the second space 121 on the first portion 31. In one embodiment, the first seal 41 covers at least part of the surface of the second portion 32, and the first seal 41 can play a protective role, reducing the impact of debris entering the second space 121 on the second portion 32.

In one embodiment, along the third direction Z, the first part 31 is located between the second part 32 and the top wall 113, and the second part 32 is located between the first part 31 and the ninth wall 126. In one embodiment, the second wire harness 56 is connected to the first part 31. Optionally, the second wire harness 56 is electrically connected to the first part 31 by plugging, which is convenient for assembly and removal and can improve work efficiency.

In one embodiment, along the third direction Z, the area of the second part 32 is larger than the area of the first part 31, and the projection of the first part 31 is located within the projection of the second part 32. In one embodiment, when assembling and connecting the circuit board 30 and the second housing 12, the first part 31 and the second part 32 can be plugged together first, and then the plugged circuit board 30 is placed in the second space 121 in a manner that the second part 32 is close to the ninth wall 126, and the second part 32 is fixedly connected to the ninth wall 126. When the second part 32 and the ninth wall 126 are fixedly connected, the area of the first part 31 is small, which can provide operating space and reduce the risk of the first part 31 interfering and affecting the connection between the second part 32 and the ninth wall 126.

In one embodiment, when assembling and connecting the circuit board 30 and the second housing 12, the second part 32 can be first placed in the second space 121 and fixedly connected to the ninth wall 126, and then the first part 31 can be placed in the second space 121 and connected to the second part 32. This installation method has no specific requirements on the area of the first part 31 and the second part 32, and can reduce the influence of the relative size of the first part 31 and the second part 32 on the design of the circuit board 30.

In summary, in the electrochemical device 100 of the present application, the shell 10 seals and protects the battery cell assembly 20 through the first shell 11, and at least partially covers and protects the components on the circuit board 30 through the first seal 41 in the second shell 12, which can improve the protection performance of the electrochemical device 100 and reduce the impact of debris in the external environment on the electrochemical device 100.

As shown in FIG. 14, an embodiment of the present application further provides an electric device 200, including any of the above The electrochemical device 100 described in one embodiment can provide electrical energy to an electrical device 200 .

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

In the electrical equipment 200 of the present application, the electrochemical device 100 can adapt to complex working conditions, such as a corrosive liquid environment or a windy and sandy environment, and can reduce the impact of the external environment on the electrochemical device 100, and reduce the impact of the performance loss of the electrochemical device 100 due to the complex environment on the electrical equipment 200.

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

Claims

An electrochemical device, comprising:

The housing comprises a first shell and a second shell connected to each other, the first shell is provided with a closed first space, the second shell and the first shell form a second space, and the second space is isolated from the first space;

A battery cell assembly is arranged in the first space;

A circuit board is disposed in the second space, the circuit board is electrically connected to the battery core assembly, and the circuit board includes a plurality of components;

The first sealing member is disposed in the second space and covers at least a portion of the plurality of components.
The electrochemical device according to claim 1, characterized in that

The first shell includes a top wall, the top wall is provided with a first through hole, and the first through hole passes through the top wall;

The electrochemical device further comprises:

A first terminal, a portion of which is accommodated in the first space and connected to the battery cell assembly, and a portion of which passes through the first through hole and extends into the second space to be connected to 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 electrochemical device as claimed in claim 2, characterized in that the electrochemical device further comprises 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.
The electrochemical device according to any one of claims 1 to 3, characterized in that

The first shell includes a top wall, the top wall is provided with a third through hole, and the third through hole passes through the top wall;

The electrochemical device further comprises:

a first wiring harness, a portion of which is accommodated in the first space and electrically connected to the battery cell assembly, a portion of which passes through the third through hole and extends into the second space to connect to the circuit board, and the first wiring harness can obtain electrical signal information of the battery cell assembly;

A fourth sealing member at least partially fills the third through hole and connects the first wiring harness and the top wall.
The electrochemical device according to any one of claims 1 to 4 is characterized in that the electrochemical device also includes a connector, which is detachably connected to the second shell, a portion of the connector is located in the second space and is detachably connected to the circuit board, and a portion of the connector extends out of the second shell.
The electrochemical device according to any one of claims 1 to 5, characterized in that the circuit board comprises a first part and a second part, and the first part and the second part are detachably connected to each other;

The first sealing member covers at least a portion of the first portion, and/or the first sealing member Covering at least a portion of the second portion.
The electrochemical device according to any one of claims 1 to 6, characterized in that

The first shell includes a peripheral wall, a top wall and a bottom wall, wherein the peripheral wall connects the top wall and the bottom wall;

The top wall is provided with a first recess, and a portion of the peripheral wall is accommodated in the first recess;

The electrochemical device further includes a fifth sealing member, which at least partially fills the first recess, and the fifth sealing member disposed in the first recess connects the peripheral wall and the inner wall of the first recess.
The electrochemical device according to any one of claims 1 to 7, characterized in that

The first shell includes a peripheral wall, a top wall and a bottom wall, wherein the peripheral wall connects the top wall and the bottom wall;

The bottom wall is provided with a second recess, and a portion of the peripheral wall is accommodated in the second recess;

The electrochemical device further includes a sixth seal member disposed in the second recessed portion, and the sixth seal member connects the peripheral wall and the bottom wall.
The electrochemical device as described in claim 8 is characterized in that a first protrusion is also provided on the side of the bottom wall facing the first space, the first protrusion is arranged in the second recess, the first protrusion extends from the surface of the bottom wall toward the first space, and the surrounding wall abuts against the first protrusion.
The electrochemical device according to any one of claims 7 to 9, characterized in that

The peripheral wall includes a first wall, a second wall, a third wall and a fourth wall, and the top wall and the bottom wall are both connected to the first wall, the second wall, the third wall and the fourth wall;

The electrochemical device also includes a plurality of seventh seals, a portion of which connects the first wall and the second wall, a portion of which connects the second wall and the third wall, a portion of which connects the third wall and the fourth wall, and a portion of which connects the first wall and the fourth wall.
The electrochemical device according to any one of claims 7 to 9, wherein the second shell and the top wall form the second space.
The electrochemical device as described in any one of claims 7 to 9 is characterized in that the second shell is provided with a first connecting hole, the top wall is provided with a second connecting hole, the peripheral wall is provided with a third connecting hole, and the electrochemical device also includes a fastener, and the fastener passes through the first connecting hole, the second connecting hole and the third connecting hole.
The electrochemical device according to claim 4, characterized in that the electrochemical device further comprises a second wiring harness, the second wiring harness is accommodated in the second space, and the second wiring harness is connected to the first wiring harness and the circuit board.
The electrochemical device as described in claim 13 is characterized in that a fixing portion is also provided on the top wall, the fixing portion is provided on the surface of the top wall and is located in the second space, and the fixing portion can be used to connect the first wiring harness and/or the second wiring harness.
The electrochemical device according to claim 4, characterized in that the first wiring harness is variable Shaped flexible structure.
The electrochemical device according to claim 3, characterized in that the first terminal and the third terminal are elastically deformable flexible structures.
The electrochemical device according to claim 1, characterized in that

The first housing includes a top wall;

The battery cell comprises a battery cell shell, an electrode assembly and a tab, wherein the electrode assembly is arranged inside the battery cell shell, a portion of the tab is located inside the battery cell shell and connected to the electrode assembly, and a portion of the tab extends out of the battery cell shell;

The electrochemical device further includes an adapter plate, which is disposed in the first space, located between the battery cell housing and the top wall, connected to a plurality of the tabs, and the circuit board is electrically connected to the adapter plate.
The electrochemical device according to claim 2, characterized in that the top wall comprises a first surface and a second surface opposite to each other, the first surface faces the first space, and the second surface faces the second space;

The top wall is further provided with a second convex portion, the second convex portion is provided on the first surface and extends out of the first surface, and the first through hole passes through the second convex portion.
The electrochemical device as described in claim 1 is characterized in that the circuit board includes a BMS (Battery Management System, referred to as BMS) component.
An electrical equipment, characterized in that it comprises the electrochemical device according to any one of claims 1 to 19.