Electrochemical device and electric equipment

Abstract

The application discloses an electrochemical device and an electric equipment. The electrochemical device comprises a shell, an electric core assembly, a circuit board and a first sealing member. The shell comprises a first shell and a second shell connected with each other, the first shell is provided with a closed first space, and the second shell and the first shell are connected to form a second space which 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. The first sealing member is arranged in the second space and covers at least part of the components. In the electrochemical device, the shell protects the electric core assembly through the first shell, and protects at least part of the components on the circuit board through the first sealing member in the second shell, so that the protection performance of the electrochemical device can be improved, and the influence of foreign matters in the external environment on the electrochemical device can be reduced.

Description

Technical Field

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

[0002] Currently, with the rapid development of new energy batteries, they are being applied to an increasing number of industries. In certain complex operating conditions, electrochemical devices containing battery modules may come into contact with liquids, even corrosive liquids. If liquid enters the electrochemical device, it will seriously affect its normal operation. Summary of the Invention

[0003] 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.

[0004] Embodiments of this application provide 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 has a closed first space, and the second shell and the second shell are connected to form a second space, which is isolated from the first space. The battery cell assembly is disposed within the first space. The circuit board is disposed within the second space and is electrically connected to the battery cell assembly. The circuit board includes multiple components. The first seal is disposed in the second space and covers at least a portion of the multiple components.

[0005] In the aforementioned electrochemical device, the outer casing provides sealed protection for the battery cell assembly through the first housing, and at least partially covers and protects the components on the circuit board through the first seal within the second housing. This improves the protective performance of the electrochemical device and reduces the impact of external environmental contaminants on the electrochemical device.

[0006] In some embodiments of this application, the first housing includes a top wall with a first through-hole extending through the top wall. The electrochemical device further includes a first terminal and a second seal. A portion of the first terminal is housed in a first space and connected to the cell assembly, and a portion of the first terminal extends through the first through-hole into a second space to connect to a circuit board. The second seal at least partially fills the first through-hole and connects the first terminal and the top wall.

[0007] The aforementioned first terminal connects the battery cell assembly in the first space to the circuit board in the second space, and the second seal reduces the risk of external debris entering the first space or the second space through the gap between the first terminal and the inner wall of the first through hole.

[0008] In some embodiments of this application, the first terminal is one of the positive and negative terminals of the battery cell assembly, used for the input and output of electrical energy of the battery cell assembly.

[0009] In some embodiments of this application, the electrochemical device further includes a third terminal, a portion of which is housed in a second space and connected to a circuit board, and the third terminal is connected to the first terminal.

[0010] In some embodiments of this application, the circuit board includes a BMS (Battery Management System) component. The BMS component includes multiple electronic components that can perform functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell.

[0011] In some embodiments of this application, the first housing includes a top wall with a third through hole penetrating through it. The electrochemical device further includes a wiring harness and a fourth seal. A portion of the wiring harness is housed in a first space and electrically connected to the battery cell assembly. A portion of the wiring harness passes through the third through hole and extends into a second space to connect to a circuit board. The wiring harness can acquire electrical signal information from the battery cell assembly. At least a portion of the fourth seal fills the third through hole and connects the wiring harness and the top wall.

[0012] The aforementioned wiring harness enables the circuit board to acquire electrical signal information from the battery cell assembly, and the fourth seal reduces the risk of external debris entering the first or second space through the gap between the wiring harness and the inner wall of the third through hole.

[0013] In some embodiments of this application, the electrochemical device further includes a connector detachably connected to the second housing, a portion of which is located within the second space and detachably connected to the circuit board, and a portion of which extends out of the second housing.

[0014] The aforementioned connectors enable the electrochemical device to be electrically connected to external equipment. By being detachably connected to the second housing, it facilitates assembly and disassembly, thereby improving work efficiency.

[0015] In some embodiments of this application, the circuit board includes a first part and a second part, which are detachably connected to each other to facilitate assembly and disassembly and improve the space utilization within the second housing; a first seal covers at least a portion of the first part, and / or the first seal covers at least a portion of the second part, which improves the protective performance of the circuit board and reduces the risk of the circuit board being contaminated by external debris.

[0016] In some embodiments of this 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 the edge of the top wall extends out of the peripheral wall, which facilitates the fixed connection between the top wall and the peripheral wall.

[0017] In some embodiments of this application, the first housing includes a peripheral wall, a top wall, and a bottom wall, with the peripheral wall connecting the top wall and the bottom wall; the top wall has a first recess, and a portion of the peripheral wall is accommodated in the first recess; the electrochemical device further includes a fifth seal, which at least partially fills the first recess, and the fifth seal disposed within the first recess connects the peripheral wall and the inner wall of the first recess. The fifth seal can provide a sealing function, reducing 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 reducing the risk of debris from 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.

[0018] In some embodiments of this application, the first housing includes a peripheral wall, a top wall, and a bottom wall, with the peripheral wall connecting the top wall and the bottom wall; the bottom wall has a second recess, and a portion of the peripheral wall is accommodated in the second recess; the electrochemical device further includes a sixth seal, which is disposed in the second recess and connects the peripheral wall and the bottom wall. The sixth seal serves to seal, reducing the risk of gas or liquid leaking out of the first space through the gap at the connection between the peripheral wall and the second recess, and reducing the risk of debris from outside the first space entering the first space through the gap at the connection between the peripheral wall and the second recess.

[0019] In some embodiments of this application, a first protrusion is provided on the side of the bottom wall facing the first space. The first protrusion is disposed in the second recess. The first protrusion extends from the surface of the bottom wall toward the first space, and the peripheral wall abuts against the first protrusion.

[0020] In some embodiments of this 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, some of which are connected to the first wall and the second wall, some of which are connected to the second wall and the third wall, some of which are connected to the third wall and the fourth wall, and some of which are connected to the first wall and the fourth wall.

[0021] In some embodiments of this application, the second housing and the top wall form a second space.

[0022] In some embodiments of this application, the second housing is provided with a first connection hole, the top wall is provided with a second connection hole, and the peripheral wall is provided with a third connection hole. The electrochemical device also includes a fastener, which passes through the first connection hole. 、 Second connecting hole and third connecting hole.

[0023] In one embodiment, the electrochemical device further includes a first wiring harness, a portion of which is housed in a first space and used to connect to a battery cell assembly, and a portion of which extends into a second space to connect to a circuit board. The circuit board is able to acquire electrical signal information of the battery cells in the battery cell assembly through the first wiring harness.

[0024] In some embodiments of this application, a fixing part is also provided on the top wall. The fixing part is located on the surface of the top wall and in the second space. The fixing part can be used to connect the first wire harness and / or the second wire harness to restrict the movement of the first wire harness and / or the second wire harness and reduce the impact of the electrochemical device shaking on the first wire harness and / or the second wire harness.

[0025] Embodiments of this application also provide an electrical device, including the electrochemical device described in any of the foregoing embodiments.

[0026] Among the aforementioned electrical devices, electrochemical devices have better protective performance, which can reduce the impact of impurities from the external environment entering the electrochemical device on the electrical devices. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an electrochemical device in one embodiment of this application.

[0028] Figure 2 yes Figure 1 A schematic diagram of the electrochemical device in the state of separation between the first and second housings.

[0029] Figure 3 yes Figure 1 An exploded view of the first shell and internal structure of the electrochemical device shown.

[0030] Figure 4 yes Figure 1 An exploded view of the second shell and internal structure of the electrochemical device shown.

[0031] Figure 5 This is a schematic diagram of the battery cell structure in one embodiment of this application.

[0032] Figure 6 yes Figure 5 The diagram shows the structure of the battery cell before packaging.

[0033] Figure 7 This is a first view of the top wall in one embodiment of this application.

[0034] Figure 8 This is a second view of the top wall in one embodiment of this application.

[0035] Figure 9 This is a first view of the bottom wall in one embodiment of this application.

[0036] Figure 10 This is a second view of the bottom wall in one embodiment of this application.

[0037] Figure 11 yes Figure 1A schematic diagram of the second shell and internal structure of the electrochemical device shown.

[0038] Figure 12 This is a schematic diagram of the circuit board structure in one embodiment of this application.

[0039] Figure 13 This is an exploded view of the circuit board shown in convex 12.

[0040] Figure 14 This is a schematic diagram of the structure of an electrical device in one embodiment of this application.

[0041] Explanation of main component symbols

[0042] Electrochemical device 100

[0043] Casing 10

[0044] First shell 11

[0045] First Space 111

[0046] Zhoubi 112

[0047] Third connecting hole 1120

[0048] First Wall 1121

[0049] Second Wall 1122

[0050] Third Wall 1123

[0051] Fourth Wall 1124

[0052] Top Wall 113

[0053] First through hole 1131

[0054] Second through hole 1132

[0055] Third through hole 1133

[0056] First surface 11341

[0057] Second surface 11342

[0058] First recess 11343

[0059] Second convex portion 1136

[0060] The third convex part 1137

[0061] The fourth convex part 1138

[0062] Fixing part 1139

[0063] Bottom wall 115

[0064] Third surface 11511

[0065] Fourth surface 11512

[0066] Second recess 11513

[0067] First convex part 1153

[0068] Second connecting hole 116

[0069] Second shell 12

[0070] Second Space 121

[0071] Fifth Wall 122

[0072] Sixth Wall 123

[0073] Seventh Wall 124

[0074] Eighth Wall 125

[0075] Ninth Wall 126

[0076] First connecting hole 127

[0077] Battery cell assembly 20

[0078] Cell 21

[0079] Cell casing 211

[0080] First cell casing 2111

[0081] Second cell casing 2112

[0082] Main body 2113

[0083] Edge banding 2114

[0084] Top edge sealing 21141

[0085] Side sealing 21142

[0086] Electrode assembly 212

[0087] JE213

[0088] Positive electrode 2131

[0089] Negative electrode 2132

[0090] Circuit board 30

[0091] Part 1, Chapter 31

[0092] Part 2, 32

[0093] First sealing element 41

[0094] Second seal 42

[0095] Third sealing element 43

[0096] Fourth seal 44

[0097] Seventh seal 45

[0098] First terminal 51

[0099] Second terminal 52

[0100] Third terminal 53

[0101] Fourth terminal 54

[0102] First harness 55

[0103] First connector 551

[0104] Second harness 56

[0105] Second connector 561

[0106] Adapter board 60

[0107] Substrate 61

[0108] Fourth through hole 611

[0109] Conductive component 62

[0110] Connector 70

[0111] Third connector 71

[0112] Fastener 80

[0113] 200 electrical appliances

[0114] First direction X

[0115] Second direction Y

[0116] Third direction Z

[0117] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0118] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0119] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have a component that is centrally located. When a component is considered to be "set" on another component, it can be directly set on the other component or may also have a component that is centrally located.

[0120] Unless otherwise defined, 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0121] Embodiments of this application provide 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 has a closed first space, and the second shell and the first shell form a second space, which is isolated from the first space. The battery cell assembly is disposed within the first space. The circuit board is disposed within the second space and is electrically connected to the battery cell assembly. The circuit board includes multiple components. The first seal is disposed in the second space and covers at least a portion of the multiple components.

[0122] In the aforementioned electrochemical device, the outer casing provides sealed protection for the battery cell assembly through the first housing, and at least partially covers and protects the components on the circuit board through the first seal within the second housing. This improves the protective performance of the electrochemical device and reduces the impact of external environmental contaminants on the electrochemical device.

[0123] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0124] like Figure 1 and Figure 2 As shown, an embodiment of this application provides an electrochemical device 100, including a housing 10, the housing 10 including a first housing 11 and a second housing 12, the first housing 11 and the second housing 12 being interconnected.

[0125] In one embodiment, the first housing 11 and the second housing 12 are detachable from each other. When the first housing 11 and the second housing 12 are disconnected, they function as two independent modules. If either module malfunctions and requires replacement or maintenance, detaching and replacing the first housing 11 and the second housing 12 improves work efficiency and reduces maintenance costs. In one embodiment, the first housing 11 and the second housing 12 are connected by bolts, which increases the connection tightness and enhances the protective capability of the outer casing 10. In another embodiment, the first housing 11 and the second housing 12 are connected by snap-fit ​​fasteners. In one embodiment, the first housing 11 and the second housing 12 are bonded together with a sealant. The sealant not only fixes the first housing 11 and the second housing 12 together, but also seals the interior of the housing 10, reducing the risk of foreign matter from outside the housing 10 entering the interior of the housing 10 through the gap between the first housing 11 and the second housing 12. Optionally, the sealant is applied to the connection surface area of ​​the first housing 11 and the second housing 12. Optionally, the sealant includes, but is not limited to, any one of epoxy resin, thermally conductive silicone, silicone sealant, hot melt adhesive and polyurethane compound.

[0126] like Figure 2 , Figure 3 and Figure 4 As shown, the first housing 11 has a closed first space 111, and the second housing 12 has a second space 121. The first space 111 and the second space 121 are isolated from each other. The isolation between the first space 111 and the second space 121 means that the first space 111 and the second space 121 are not connected.

[0127] 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 disposed in a first space 111, and the circuit board 30 and the first seal 41 are disposed in a 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 a portion of the multiple components.

[0128] In the electrochemical device 100 of this application, the outer casing 10 seals and protects the battery cell assembly 20 through the first casing 11, and at least partially covers and protects the components on the circuit board 30 through the first sealing member 41 in the second casing 12, which can improve the protection performance of the electrochemical device 100 and reduce the impact of foreign matter in the external environment on the battery cell assembly 20 and the components on the circuit board 30.

[0129] In one embodiment, the battery cell assembly 20 includes a plurality of battery cells 21, which are stacked sequentially.

[0130] In one embodiment, the first sealant 41 is formed by applying a first sealant to the surface of the circuit board 30 and then curing it. In one embodiment, the first sealant includes, but is not limited to, any one of epoxy resin, thermally conductive silicone, silicone sealant, hot melt adhesive, and polyolefin compound.

[0131] 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, top wall 113, and bottom wall 115 enclose a first space 111. The top wall 113 and bottom wall 115 are disposed opposite each other along a third direction Z, and the first housing 11 and the second housing 12 are disposed opposite each other along a third direction Z.

[0132] In one embodiment, the edge of the top wall 113 extends into a peripheral wall 112, which facilitates the fixed connection between the top wall 113 and the peripheral wall 112.

[0133] 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 each other along a first direction X, and the third wall 1123 and the fourth wall 1124 are arranged opposite each other along a second direction Y. The first wall 1121 and the second wall 1122 are both connected to the third wall 1123 and the fourth wall 1124. 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 enclose a 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.

[0134] In one embodiment, the peripheral wall 112 is a one-piece molded structure. In another embodiment, the peripheral wall 112 is formed by sequentially connecting a first wall 1121, a second wall 1122, a third wall 1123, and a 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. By welding, the gaps at the connection points of the first wall 1121 and the third wall 1123, the second wall 1122 and the third wall 1123, the third wall 1123 and the fourth wall 1124, and the fourth wall 1124 and the first wall 1121 are sealed. This reduces the risk of gas or liquid leaking out of the first space 111 through the aforementioned gaps, and also reduces the risk of debris from outside the first space 111 entering the first space 111 through the aforementioned gaps, thereby reducing the risk of contaminating the battery cell assembly 20.

[0135] In one embodiment, the second housing 12 is connected to the top wall 113, and the second housing 12 and the top wall 113 enclose a second space 121. The first space 111 and the second space 121 are located on both sides of the top wall 113 along the third direction Z.

[0136] In one embodiment, the top wall 113 is provided with a through hole 1131, which can connect the first space 111 and the second space 121.

[0137] In one embodiment, the top wall 113 is provided with a through second through hole 1132, which can connect the first space 111 and the second space 121.

[0138] 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 housed in a first space 111 and used for electrical connection to the battery cell assembly 20. A portion of the first terminal 51 passes through a first through-hole 1131 and extends into a second space 121 to connect to the circuit board 30. The second terminal 52 is partially housed in the first space 111 and used for electrical connection to the battery cell assembly 20. A portion of the second terminal 52 passes through a 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 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 via direct contact. In one embodiment, the second terminal 52 is connected to the circuit board 30 via direct contact. In one embodiment, one of the first terminal 51 and the second terminal 52 is the positive terminal of the battery cell assembly 20, and the other is the negative terminal of the battery cell assembly 20. The first terminal 51 and the second terminal 52 are used for the input and output of electrical energy of the battery cell assembly 20.

[0139] In one embodiment, the electrochemical device 100 further includes a second seal 42. In another embodiment, the electrochemical device 100 further includes a third seal 43. The second seal 42 at least partially fills 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, reducing the risk of gas or liquid in the first space 111 leaking out through the gap between the first terminal 51 and the inner wall of the first through hole 1131, and reducing 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 seal 43 is at least partially filled in the second through hole 1132. The third seal 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 seal 43 can play a sealing role, reducing the risk of gas or liquid in the first space 111 leaking out through the gap between the second terminal 52 and the inner wall of the second through hole 1132, and reducing 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.

[0140] In one embodiment, the second seal 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 it. In one embodiment, the second sealant includes, but is not limited to, any one of epoxy resin, thermally conductive silicone, silicone sealant, hot melt adhesive, and polyolefin compound.

[0141] In one embodiment, the third seal 43 is formed by filling the gap between the second terminal 52 and the inner wall of the second through hole 1132 with a third sealant and then curing it. In one embodiment, the third sealant includes, but is not limited to, any one of epoxy resin, thermally conductive silicone, silicone sealant, hot melt adhesive, and polyolefin compound.

[0142] In one embodiment, the electrochemical device 100 further includes a third terminal 53. In another embodiment, the electrochemical device 100 further includes a fourth terminal 54. A portion of the third terminal 53 is housed 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 to the battery cell assembly 20. A portion of the fourth terminal 54 is housed 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 to the battery cell assembly 20. The battery cell assembly 20 is electrically connected to the circuit board 30 via the first terminal 51 connecting to the third terminal 53 and the second terminal 52 connecting to the fourth terminal 54.

[0143] 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 connecting the first housing 11 and the second housing 12, the first terminal 51 is connected to the third terminal 53, and the second terminal 52 is connected to the fourth terminal 54. Then, the first housing 11 and the second housing 12 are connected. 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 housing 11 and the second housing 12 on the connection between the first terminal 51 and the third terminal 53 and on the connection between the second terminal 52 and the fourth terminal 54 can be reduced, thereby reducing the risk of connection failure between the first terminal 51 and the third terminal 53 and the second terminal 52 and the fourth terminal 54.

[0144] In one embodiment, the top wall 113 is provided with a through third through hole 1133, which can connect the first space 111 and the second space 121.

[0145] In one embodiment, the electrochemical device 100 further includes a first wiring harness 55, a portion of which is housed in a first space 111 and used to connect to the battery cell assembly 20, and a portion of which passes through a third through-hole 1133 and extends into a second space 121 to electrically connect to the circuit board 30.

[0146] In one embodiment, the electrochemical device 100 further includes a second wiring harness 56, which is housed in a second space 121. The second wiring harness 56 is connected to the first wiring harness 55 and the circuit board 30, such 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. This allows the circuit board 30 to acquire electrical signal information, such as voltage information and charge information, of each battery cell 21 in the battery cell assembly 20. Optionally, the circuit board 30 acquires the voltage information of the battery cell 21 through the first wiring harness 55 and the second wiring harness 56.

[0147] In one embodiment, the first wire harness 55 includes a first connector 551, and the second wire harness 56 includes a second connector 561. The first connector 551 and the second connector 561 are pluggable connected. The pluggable connection of the first wire harness 55 and the second wire harness 56 through the connectors can improve connection efficiency and shorten assembly time.

[0148] In one embodiment, the first wire harness 55 and the second wire harness 56 are deformable flexible structures. Before the first housing 11 and the second housing 12 are connected, the first wire harness 55 and the second wire harness 56 are first inserted and connected, and then the first housing 11 and the second housing 12 are connected. Through the elastic deformation of the first wire harness 55 and the second wire harness 56, the influence of the relative movement of the first housing 11 and the second housing 12 on the connection between the first wire harness 55 and the second wire harness 56 can be reduced, thereby reducing the risk of connection failure between the first wire harness 55 and the second wire harness 56.

[0149] In one embodiment, a fixing part 1139 is further provided on the top wall 113. The fixing part 1139 is disposed on the surface of the top wall 113 and located within the second space 121. The fixing part 1139 can be used to connect the first wire harness 55 and / or the second wire harness 56 to restrict the movement of the first wire harness 55 and / or the second wire harness 56, reducing the impact of the electrochemical device 100 shaking on the first wire harness 55 and / or the second wire harness 56. In one embodiment, the fixing part 1139 includes a snap fastener with an elastic opening. The elastic deformation of the snap fastener 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. Optionally, a portion of the second wire harness 56 is connected to the fixing part 1139.

[0150] In one embodiment, the electrochemical device 100 further includes a fourth seal 44, which at least partially fills 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, reducing the risk of gas or liquid in the first space 111 leaking out through the gap between the first wiring harness 55 and the inner wall of the third through hole 1133, and reducing 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.

[0151] In one embodiment, the fourth seal 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 it. In one embodiment, the fourth sealant includes, but is not limited to, any one of epoxy resin, thermally conductive silicone, silicone sealant, hot melt adhesive, and polyolefin compound.

[0152] In one 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 arranged opposite each other along a first direction X, the seventh wall 124 and the eighth wall 125 are arranged opposite each other along a second direction Y, and the ninth wall 126 is arranged opposite to the top wall 113 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, the eighth wall 125, the ninth wall 126, and the top wall 113 enclose a second space 121.

[0153] like Figure 5 and Figure 6 As shown, in one embodiment, the battery cell 21 includes a battery cell housing 211, an electrode assembly 212, and a tab 213. The electrode assembly 212 is disposed inside the battery cell housing 211, a portion of the tab 213 is located inside the battery cell housing 211 and connected to the electrode assembly 212, and a portion of the tab 213 extends out of the battery cell housing 211.

[0154] In one embodiment, the electrode assembly 212 includes a positive electrode, a negative electrode, and a separator (not shown). The separator is disposed between the positive electrode and the negative electrode. The positive electrode, the separator, and the negative electrode are wound or stacked to form the electrode assembly 212.

[0155] 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 together facing each other, an internal space capable of accommodating the electrode assembly 212 is formed. In another embodiment, the cell housing 211 includes a first cell housing and a second cell housing (not shown) that are separate from each other. When the first cell housing and the second cell housing are folded together facing each other, an internal space capable of accommodating the electrode assembly 212 is formed.

[0156] In one embodiment, the cell housing 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, and the electrode assembly 212 is housed within the main body portion 2113. The tab 213 extends out of the cell housing 211 from the sealing portion 2114. The sealing portion 2114 includes a top sealing edge 21141 and a side sealing edge 21142 connected to each other. The top sealing edge 21141 is located at the end of the main body portion 2113 along a third direction Z, and the side sealing edge 21142 is located at the end of the main body portion 2113 along a second direction Y. The tab 213 extends out of the cell housing 211 from the top sealing edge 21141. In one embodiment, there are two side seals 21142, located at opposite ends of the main body 2113 along the second direction Y. A top seal 21141 is located between and connects the two side seals 21142. The tab 213 includes a positive tab 2131 and a negative tab 2132, with the positive tab 2131 connected to the positive electrode and the negative tab 2132 connected to the negative electrode. In one embodiment, the positive tab 2131 and the negative tab 2132 are located on the same side of the cell housing 211. In another embodiment, the positive tab 2131 and the negative tab 2132 are located at opposite ends of the cell housing 211 (not shown).

[0157] As an example, the following description takes the case where the positive tab 2131 and the negative tab 2132 are located on the same side of the cell housing 211.

[0158] Please refer to the following: Figure 2 , Figure 3 and Figure 7 In one embodiment, a plurality of battery cells 21 are stacked sequentially along a first direction X.

[0159] In one embodiment, the electrochemical device 100 further includes a plurality of seventh seals 45, portions of which are connected to the first wall 1121 and the third wall 1123, portions of which are connected to the second wall 1122 and the third wall 1123, portions of which are connected to the second wall 1122 and the fourth wall 1124, and portions of which are connected to the fourth wall 1124 and the first wall 1121. The plurality of seventh seals 45 can perform a sealing function, separating the first wall 1121 and the third wall 1123. The gaps at the joints, the gaps at the joints of the second wall 1122 and the third wall 1123, the gaps at the joints of the second wall 1122 and the fourth wall 1124, and the gaps at the joints of the fourth wall 1124 and the first wall 1121 are sealed to reduce the risk of gas or liquid leaking out of the first space 111 through the aforementioned gaps, and to reduce the risk of debris from outside the first space 111 entering the first space 111 through the aforementioned gaps, thereby reducing the risk of contaminating the battery cell assembly 20.

[0160] In one embodiment, the seventh seal 45 includes foam; optionally, the seventh seal 45 includes waterproof foam.

[0161] In one embodiment, the seventh seal 45 is formed by applying and curing a sealant to the joint between two adjacent first walls 1121, second wall 1122, third wall 1123, and fourth wall 1124. In one embodiment, the sealant includes, but is not limited to, any one of epoxy resin, thermally conductive silicone, silicone sealant, hot melt adhesive, and polyolefin compound.

[0162] Please refer to the following: Figure 3 , Figure 7 and Figure 8 In one embodiment, the top wall 113 includes a first surface 11341 and a second surface 11342 facing 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. The fixing part 1139 is provided on the second surface 11342.

[0163] In one embodiment, the top wall 113 is provided with a first recess 11343, which is located 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, such 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.

[0164] 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 the 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 seal provides a sealing effect, reducing the risk of gas or liquid leaking from the first space 111 through the gap at the connection between the peripheral wall 112 and the first recess 11343, and reducing the risk of debris from 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.

[0165] In one embodiment, the fifth seal is formed by filling the first recess 11343 with a fifth sealant and then curing it. In one embodiment, the fifth sealant includes, but is not limited to, any one of epoxy resin, thermally conductive silicone, silicone sealant, hot melt adhesive, and polyurethane compound.

[0166] In one embodiment, the top wall 113 is further provided with a second protrusion 1136, which is disposed 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 restricts 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.

[0167] In one embodiment, the top wall 113 is further provided with a third protrusion 1137, which is disposed on the first surface 11341 and extends out of the first surface 11341. The second through hole 1132 passes through the third protrusion 1137. The third protrusion 1137 further restricts 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.

[0168] In one embodiment, the top wall 113 is further provided with a fourth protrusion 1138, which is disposed on the first surface 11341 and extends out of the first surface 11341. The third through hole 1133 penetrates the fourth protrusion 1138. The fourth protrusion 1138 further restricts the movement of the first wire 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.

[0169] Please refer to the following: Figure 3 , Figure 9 and Figure 10 In one embodiment, the bottom wall 115 includes a third surface 11511 and a fourth surface 11512 facing each other, the third surface 11511 facing the first space 111 and the fourth surface 11512 facing away from the first space 111.

[0170] In one embodiment, the bottom wall 115 is provided with a second recess 11513, which is located 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, such 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.

[0171] 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 the inner wall connecting the first wall 1121, the second wall 1122, the third wall 1123, the fourth wall 1124, and the second recess 11513. The sixth seal provides a sealing effect, reducing the risk of gas or liquid leaking from the first space 111 through the gap at the connection between the peripheral wall 112 and the second recess 11513, and reducing the risk of debris from 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.

[0172] In one embodiment, the sixth seal is formed by filling the second recess 11513 with a sixth sealant and then curing it. In one embodiment, the sixth sealant includes, but is not limited to, any one of epoxy resin, thermally conductive silicone, silicone sealant, hot melt adhesive, and polyolefin compound.

[0173] In one embodiment, the third surface 11511 is connected to the cell assembly 20 and is used to support the cell assembly 20. Optionally, the third surface 11511 is planar, and the planar third surface 11511 can reduce the impact on the cell assembly 20 when the electrochemical device 100 is shaken.

[0174] In one embodiment, the bottom wall 115 is further provided with a first protrusion 1153, which is disposed within the second recess 11513. The first protrusion 1153 extends from the bottom wall 115 of the second recess 11513 toward the top wall 113. The portion of the peripheral wall 112 extending into the second recess 11513 abuts against the first protrusion 1153, creating a gap between the peripheral wall 112 and the bottom wall 115 of the second recess 11513. This gap allows the sixth seal filled within the second recess 11513 to fully contact the peripheral wall 112, reducing the risk that a tight fit between the peripheral wall 112 and the second recess 11513 could result in insufficient sixth seal within the second recess 11513, thus affecting the sealing effect.

[0175] In one embodiment, there are multiple first protrusions 1153, which are spaced apart from each other in the second recess 11513. 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.

[0176] Please refer to the following: Figure 3 and Figure 4In one embodiment, the electrochemical device 100 further includes an adapter plate 60 disposed within the first space 111. The adapter plate 60 connects to a plurality of tabs 213 for electrically connecting 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 to a plurality of battery cells 21 by connecting the plurality of tabs 213. The adapter plate 60 electrically connects the plurality of battery cells 21 to the circuit board 30 by connecting the first terminal 51 and the second terminal 52. The adapter plate 60 electrically connects the plurality of battery cells 21 to the circuit board 30 by connecting the first wire harness 55.

[0177] In one embodiment, the adapter plate 60 includes a substrate 61 and a plurality of conductive elements 62 arranged along a first direction X on the substrate 61. The conductive elements 62 are used for electrically connecting to tabs 213. In one embodiment, a portion of the plurality of conductive elements 62 is connected to a first terminal 51. In one embodiment, a portion of the plurality of conductive elements 62 is connected to a second terminal 52. In one embodiment, a portion of the plurality of conductive elements 62 is connected to a first wiring harness 55. In one embodiment, the substrate 61 includes a PCB (Printed Circuit Board). In one embodiment, the first wiring harness 55 is electrically connected to the plurality of conductive elements 62 via wires within the PCB.

[0178] In one embodiment, multiple conductive elements 62 are integrally formed with the substrate 61. In another embodiment, the multiple conductive elements 62 are integrally formed with the substrate 61 by injection molding, and a portion of the structure of the conductive elements 62 is embedded within the substrate 61. Connecting the conductive elements 62 to the substrate 61 by injection molding can improve working efficiency and save on the manufacturing cost of the adapter board 60.

[0179] In one embodiment, a portion of the conductive element 62 is exposed on the side of the substrate 61 facing the top wall 113. The substrate 61 is provided with a fourth through hole 611, which allows the tab 213 to pass through the substrate 61, enabling the tab 213 to extend out of the substrate 61 and connect with the conductive element 62. In one embodiment, there are multiple fourth through holes 611, which are arranged at intervals along a first direction X. Optionally, each fourth through hole 611 allows one tab 213 to pass through.

[0180] In one embodiment, the conductive element 62 is disposed between two adjacent fourth through holes 611 along the first direction X. The tab 213 passes through the fourth through hole 611 and bends towards the adjacent conductive element 62, making contact with it. In another embodiment, two adjacent tabs 213 along the first direction X pass out of the fourth through hole 611, bend towards each other, and connect to the same conductive element 62. In yet another embodiment, the tab 213 is connected to the conductive element 62 by welding.

[0181] In one embodiment, the plurality of fourth through holes 611 comprises two parts, and the two parts of the fourth through holes 611 are spaced apart along the second direction Y, so that both tabs 213 on the same cell 21 can pass through the fourth through holes 611. In one embodiment, the plurality of conductive elements 62 comprises two parts, and the two parts of the conductive elements 62 are spaced apart along the second direction Y, so that all tabs 213 are electrically connected through the plurality of conductive elements 62.

[0182] Please refer to the following: Figure 2 , Figure 3 , Figure 4 and Figure 11 In one embodiment, the second housing 12 is provided with a first connecting hole 127, and the top wall 113 is provided with a second connecting hole 116. The electrochemical device 100 further includes a fastener 80, which connects the first connecting hole 127 and the second connecting hole 116, thereby fixing the second housing 12 to the first housing 11. In one embodiment, the first connecting hole 127 penetrates the second housing 12 in a third direction Z, the second connecting hole 116 includes a threaded hole, and the fastener 80 includes a bolt, with a portion of the fastener 80 passing through the first connecting hole 127 and then threadedly connected to the second connecting hole 116. In one embodiment, the first connecting hole 127 penetrates the ninth wall 126 in a third direction Z.

[0183] In one embodiment, the peripheral wall 112 is provided with a third connecting hole 1120. A fastener 80 passes through the first connecting hole 127 and connects to the second connecting hole 116 and the third connecting hole 1120, thus fixing the peripheral wall 112, the top wall 113, and the second housing 12 together, further improving the strength and sealing of the electrochemical device 100. Optionally, the first wall 1121 is provided with the third connecting hole 1120. Optionally, the second wall 1122 is provided with the third connecting hole 1120.

[0184] In one embodiment, the number of first connecting holes 127, second connecting holes 116 and fasteners 80 are equal, and the positions of the first connecting holes 127 and second connecting holes 116 correspond.

[0185] In one embodiment, the number of the first connecting hole 127, the second connecting hole 116, the third connecting hole 1120 and the fastener 80 are equal, and the positions of the first connecting hole 127, the second connecting hole 116 and the third connecting hole 1120 correspond.

[0186] 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 within the second space 121 and is detachably electrically connected to the circuit board 30. A portion of the connector 70 extends beyond the second housing 12 and the outer casing 10. The connector 70 can serve as an external interface for the electrochemical device 100 to connect to an external device for charging and discharging. Optionally, the connector 70 is an aviation plug. In one embodiment, the connector 70 is connected to an eighth wall 125.

[0187] 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 allows for easy removal during maintenance. In one embodiment, the connector 70 includes a third connector 71, which is pluggably connected to the circuit board 30.

[0188] In one embodiment, the connector 70 is fixedly connected to the eighth wall 125 by bolts. This bolted connection not only ensures the stability of the connector 70's connection to the eighth wall 125 but also facilitates assembly and disassembly, improving work efficiency. In another embodiment, the connector 70 is connected to the eighth wall 125 by a snap-fit ​​mechanism, which also facilitates assembly and disassembly and improves work efficiency.

[0189] In one embodiment, the circuit board 30 includes a BMS (Battery Management System) component, which includes multiple electronic components capable of performing functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for the battery cell 21.

[0190] Please refer to the following: Figure 2 , Figure 4 , Figure 12 and Figure 13 In one embodiment, the circuit board 30 includes a first portion 31 and a second portion 32, which are electrically connected to each other and can be detached to disconnect the physical and electrical connections. In one embodiment, the first portion 31 and the second portion 32 are arranged opposite each other along a third direction Z-spaced, and the circuit board 30 is composed of two portions arranged along a third direction Z-spaced, which can improve the space utilization of the second space 121. In one embodiment, the first portion 31 and the second portion 32 are electrically connected by a plug-in connection, which facilitates assembly and disassembly and can improve work efficiency. In one embodiment, the second portion 32 is detachably connected to the ninth wall 126. In one embodiment, the second portion 32 is detachably connected to the ninth wall 126 by screws, which facilitates assembly and disassembly and can improve work efficiency.

[0191] In one embodiment, the first seal 41 covers at least a portion of the surface of the first portion 31, and the first seal 41 provides protection to reduce the impact of debris entering the second space 121 on the first portion 31. In another embodiment, the first seal 41 covers at least a portion of the surface of the second portion 32, and the first seal 41 provides protection to reduce the impact of debris entering the second space 121 on the second portion 32.

[0192] 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 wiring harness 56 is connected to the first part 31. Optionally, the second wiring harness 56 is electrically connected to the first part 31 by a plug-in connection, which facilitates assembly and disassembly and can improve work efficiency.

[0193] In one embodiment, along the third direction Z, the area of ​​the second portion 32 is larger than the area of ​​the first portion 31, and the projection of the first portion 31 lies 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 first, and then the inserted circuit board 30 can be placed into the second space 121 with the second portion 32 close to the ninth wall 126, and the second portion 32 can be 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 smaller, which can provide operating space and reduce the risk of interference from the first portion 31 affecting the connection between the second portion 32 and the ninth wall 126.

[0194] In one embodiment, when assembling the connecting circuit board 30 and the second housing 12, the second part 32 can be first placed into the second space 121 and fixedly connected to the ninth wall 126, and then the first part 31 can be placed into the second space 121 and connected to the second part 32. This installation method does not have specific requirements on the area of ​​the first part 31 and the second part 32, which can reduce the impact of the relative size of the first part 31 and the second part 32 on the design of the circuit board 30.

[0195] In summary, in the electrochemical device 100 of this application, the outer casing 10 seals and protects the battery cell assembly 20 through the first housing 11, and at least partially covers and protects the components on the circuit board 30 through the first sealing member 41 in the second housing 12, which can improve the protection performance of the electrochemical device 100 and reduce the impact of impurities in the external environment on the electrochemical device 100.

[0196] like Figure 14 As shown, embodiments of this application also provide an electrical device 200, including the electrochemical device 100 described in any of the above embodiments, wherein the electrochemical device 100 is capable of providing electrical energy to the electrical device 200.

[0197] In one embodiment, the electrical equipment 200 includes, but is not limited to, any one of a drone, an electric vehicle, an electric two-wheeler, a household appliance, and a robot.

[0198] In the electrical equipment 200 of this application, the electrochemical device 100 can adapt to complex working environments, such as corrosive liquid environments or sandstorm environments, 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.

[0199] In addition, those skilled in the art may make other changes within the spirit of this application. Of course, all such changes made in accordance with the spirit of this application should be included within the scope disclosed in this application.

Claims

1. An electrochemical device, characterized by, The electrochemical device comprises: a housing comprising a first casing and a second casing connected to each other, the first casing being provided with a closed first space, the second casing and the first casing being formed with a second space, the second space being isolated from the first space; the first casing comprising a top wall provided with a first through hole and a second through hole penetrating the top wall; an electric core assembly arranged in the first space; a circuit board arranged in the second space and capable of being electrically connected to the electric core assembly, the circuit board comprising a plurality of components; a first sealing member arranged in the second space and covering at least part of the components; a first terminal, part of the first terminal being accommodated in the first space and connected to the electric core assembly, part of the first terminal penetrating the first through hole and extending into the second space to connect the circuit board; a second terminal, part of the second terminal being accommodated in the first space and connected to the electric core assembly, part of the second terminal penetrating the second through hole and extending into the second space to connect the circuit board; a second sealing member at least partially filled in the first through hole and connected to the first terminal and the inner wall of the first through hole; a third sealing member at least partially filled in the second through hole and connected to the second terminal and the inner wall of the second through hole; a third terminal, part of the third terminal being accommodated in the second space and connected to the circuit board, part of the third terminal being connected to the first terminal to electrically connect the electric core assembly; a fourth terminal, part of the fourth terminal being accommodated in the second space and connected to the circuit board, part of the fourth terminal being connected to the second terminal to electrically connect the electric core assembly; the first terminal, the second terminal, the third terminal and the fourth terminal are flexible structures capable of being elastically deformed.

2. The electrochemical device of claim 1, wherein: the top wall is provided with a third through hole penetrating the top wall; the electrochemical device further comprises: a wire harness, part of the wire harness being accommodated in the first space and electrically connected to the electric core assembly, part of the wire harness penetrating the third through hole and extending into the second space to connect the circuit board, the wire harness being capable of acquiring electrical signal information of the electric core assembly; a fourth sealing member at least partially filled in the third through hole and connected to the wire harness and the top wall.

3. The electrochemical device of claim 1, wherein The electrochemical device further comprises a connecting member detachably connected to the second casing, part of the connecting member being located in the second space and detachably connected to the circuit board, part of the connecting member extending out of the second casing.

4. The electrochemical device of claim 1, wherein The circuit board comprises a first part and a second part, the first part and the second part being capable of being detachably connected to each other; the first sealing member covers at least part of the first part, and / or the first sealing member covers at least part of the second part.

5. The electrochemical device of claim 1, wherein: the first casing comprises 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 recess, and part of the peripheral wall is accommodated in the first recess. The electrochemical device further comprises a fifth seal member, and the fifth seal member is at least partially filled in the first recess. The fifth seal member in the first recess connects the peripheral wall and the inner wall of the first recess. 6.The electrochemical device of claim 1, wherein The first housing comprises a peripheral wall, a top wall, and a bottom wall, and the peripheral wall connects the top wall and the bottom wall. The bottom wall is provided with a second recess, and part of the peripheral wall is accommodated in the second recess. The electrochemical device further comprises a sixth seal member, and the sixth seal member is provided in the second recess. The sixth seal member connects the peripheral wall and the bottom wall.

7. The electrochemical device of claim 6, wherein The bottom wall is further provided with a first protrusion on the side facing the first space, and the first protrusion is provided in the second recess. The first protrusion is arranged by extending the surface of the bottom wall towards the first space, and the peripheral wall abuts against the first protrusion. 8.The electrochemical device of any one of claims 5 to 7, wherein The peripheral wall comprises a first wall, a second wall, a third wall, and a fourth wall, and the top wall and the bottom wall are connected to the first wall, the second wall, the third wall, and the fourth wall. The electrochemical device further comprises a plurality of seventh seal members, and part of the plurality of seventh seal members connects the first wall and the second wall, part of the plurality of seventh seal members connects the second wall and the third wall, part of the plurality of seventh seal members connects the third wall and the fourth wall, and part of the plurality of seventh seal members connects the first wall and the fourth wall.

9. The electrochemical device according to any one of claims 5 to 7, wherein The second housing and the top wall form the second space.

10. The electrochemical device according to any one of claims 5 to 7, wherein The second housing 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 further comprises a fastener. The fastener passes through the first connecting hole, the second connecting hole, and the third connecting hole.

11. An electrical device, characterized by An electrochemical device as claimed in any one of claims 1 to 10.

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