Electrochemical devices and electrical devices

Abstract

The present application discloses an electrochemical device and an electrical device, the electrochemical device comprising an electrode assembly and a shell accommodating the electrode assembly, the shell comprising a first shell and a second shell fixedly connected to the first shell, at least one of the first shell and the second shell being provided with a notch, the electrode assembly comprising a pole ear, the pole ear extending from the notch to the outside of the shell, the notch being filled with a sealing material. The electrochemical device of the present application has high sealing reliability, and the sealing method of filling the notch with a sealing material occupies little space, which can improve the energy density of the electrochemical device.

Description

Technical Field

[0001] The present application relates to an electrochemical device and an electrical device. Background Art

[0002] Electrochemical devices can be charged and discharged, and have been widely used in consumer products, digital products, power products, medical and security fields. The process used by existing electrochemical devices to achieve electrode extraction is: first, a through hole is set on the side wall of the shell, and then the pole is set in the through hole and sealed by an insulating gasket. One end of the pole located inside the shell is electrically connected to the pole ear, and the other end of the pole is located outside the shell for connecting to external electronic devices. This type of sealing structure occupies a large internal space of the electrochemical device, resulting in a large loss of energy density of the electrochemical device. At the same time, this sealing structure is more complicated, the process cost is high, and the reliability is low. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one aspect of the present application is to propose an electrochemical device, which is sealed by providing a notch on the housing of the electrochemical device to lead out the tab and filling the notch with a sealing material, and the sealing structure is simple and has high reliability.

[0004] According to an electrochemical device of an embodiment of the present application, an electrode assembly and a shell accommodating the electrode assembly are provided, wherein the shell comprises a first shell and a second shell fixedly connected to the first shell. At least one of the first shell and the second shell is provided with a notch. The electrode assembly comprises a tab, and the tab extends from the notch to the outside of the shell. The notch is filled with a sealing material.

[0005] In some embodiments, the sealing material comprises an elastic sealing material or an adhesive.

[0006] In some embodiments, the adhesive includes any one of polypropylene hot melt adhesive, phenolic resin adhesive, and epoxy adhesive.

[0007] In some embodiments, the elastic sealing material includes any one of polypropylene, polycarbonate, polyamide, polystyrene, fluororubber, and soluble polytetrafluoroethylene.

[0008] In some embodiments, the first shell is not provided with the notch, and the second shell is provided with the notch.

[0009] In some embodiments, the first shell is a top cover of the shell, and the second shell includes a side wall and a bottom wall connected to the side wall.

[0010] In some embodiments, the side wall is provided with a step portion, and the step portion is used to support the top cover.

[0011] In some embodiments, the side wall is provided with a first step portion, the top cover is provided with a second step portion corresponding to the first step portion, and the first shell and the second shell are connected through the first step portion and the second step portion to form the shell.

[0012] In some embodiments, the first shell is provided with a first notch, the second shell is provided with a second notch corresponding to the first notch, and the notch is formed by surrounding the first notch and the second notch.

[0013] In some embodiments, the first shell includes a first side wall and a first bottom wall connected to the first side wall, and the second shell includes a second side wall and a second bottom wall connected to the second side wall.

[0014] In some embodiments, the first side wall is provided with a first step portion, the second side wall is provided with a second step portion corresponding to the first step portion, and the first shell and the second shell are connected through the first step portion and the second step portion to form the shell.

[0015] In some embodiments, the shell also includes a third shell, the first shell is the top cover of the shell, the second shell is the side wall of the shell, the third shell is the bottom cover of the shell, and the first shell, the second shell and the third shell are connected in sequence to form the shell.

[0016] In some embodiments, a high-temperature protective material is filled between the groove wall of the groove and the sealing material, and the pole ear, the sealing material and the high-temperature protective material form an m-layer structure in the groove, wherein the outermost layer of the structure is made of the high-temperature protective material, and m is a positive integer greater than or equal to 3 and less than or equal to 10.

[0017] In some embodiments, the melting point of the high temperature protection material is greater than or equal to 300 degrees Celsius.

[0018] In some embodiments, the high temperature protection material includes any one of steel alloy, aluminum alloy, iron alloy, copper alloy, liquid crystal polymer, parahydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyamide, and polystyrene.

[0019] In some embodiments, the first shell and the second shell are fixedly connected up and down or left and right.

[0020] In some embodiments, the first shell and the second shell are fixedly connected together by at least one of gluing, heat sealing and welding.

[0021] In some embodiments, the material of the first shell and the second shell includes any one of steel alloy, aluminum alloy, iron alloy, copper alloy, liquid crystal polymer, parahydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, acrylonitrile-butadiene-styrene copolymer, polycarbonate, and polyamide.

[0022] In some embodiments, the electrode assembly includes two electrode tabs, and both of the electrode tabs extend from the notch to the outside of the shell.

[0023] In some embodiments, the electrode assembly includes a cathode sheet, an anode sheet, an isolation membrane and two tabs, wherein the isolation membrane is disposed between the cathode sheet and the anode sheet, and the two tabs are electrically connected to the cathode current collector of the cathode sheet and the anode current collector of the anode sheet, respectively.

[0024] In some embodiments, the two tabs extend from the same side of the housing, or the two tabs extend from different sides of the housing.

[0025] In some embodiments, the notch is rectangular in shape.

[0026] In some embodiments, one of the groove wall of the groove and the sealing material is provided with a boss, and the other is provided with a pit, and the boss is engaged with the pit.

[0027] In some embodiments, the step portion, the first step portion, and the second step portion are all L-shaped.

[0028] Another aspect of the present application is to propose an electrical device, including an electrochemical device, wherein the electrochemical device includes an electrode assembly and a shell for accommodating the electrode assembly, the shell includes a first shell and a second shell fixedly connected to the first shell, at least one of the first shell and the second shell is provided with a notch, the electrode assembly includes a pole ear, the pole ear extends from the notch to the outside of the shell, and the notch is filled with a sealing material.

[0029] According to the electrochemical device of the embodiment of the present application, a notch is provided on the housing of the electrochemical device to lead out the electrode ear, and a sealing material is filled in the notch to achieve sealing. The sealing structure is simple and has high reliability. This type of sealing occupies little space and can improve the energy density of the electrochemical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 A schematic structural diagram of an electrochemical device according to an embodiment of the present application is shown;

[0032] Figure 2 A schematic structural diagram of an electrode assembly according to an embodiment of the present application is shown;

[0033] Figure 3 A partial enlarged schematic diagram showing a notch filled with a sealing material according to an embodiment of the present application is shown;

[0034] Figure 4a-4c A schematic structural diagram of a cross section of a housing according to an embodiment of the present application is shown;

[0035] Figure 5a A schematic diagram of a structure in which a first housing and a second housing are connected up and down according to an embodiment of the present application is shown;

[0036] Figure 5b A schematic diagram showing a structure in which a notch is provided on a side wall of a second housing according to an embodiment of the present application is shown;

[0037] Figure 6 A schematic diagram showing a structure in which a first housing and a second housing are connected in an up-and-down manner according to another embodiment of the present application is shown;

[0038] Figure 7 A schematic diagram showing a structure in which only the second housing is provided with an L-shaped step portion according to an embodiment of the present application is shown;

[0039] Figure 8 A schematic diagram showing a structure in which both the first shell and the second shell are provided with an L-shaped step portion according to an embodiment of the present application;

[0040] Fig. 9 A schematic diagram of a structure in which a first housing and a second housing are connected in a left-right manner according to an embodiment of the present application is shown;

[0041] Fig.10 A schematic diagram of a structure in which a first housing and a second housing are connected in a left-right manner according to another embodiment of the present application is shown;

[0042] Fig.11 A schematic diagram of a structure composed of a sealing material and a cathode ear according to an embodiment of the present application is shown;

[0043] Fig.12 A schematic diagram of a structure composed of a sealing material, a high temperature protection material and a cathode ear according to an embodiment of the present application is shown;

[0044] Fig.13 A schematic diagram showing a structure in which a cathode ear and an anode ear extend from different sides of a housing according to an embodiment of the present application;

[0045] Fig.14A schematic diagram showing a structure in which a cathode ear and an anode ear extend from the same side of a housing according to an embodiment of the present application is shown;

[0046] Fig.15 A schematic diagram of the structure of a slot filling adhesive according to an embodiment of the present application is shown;

[0047] Fig.16 A schematic diagram showing a structure in which a bottom wall of a notch is provided with a pit according to an embodiment of the present application is shown;

[0048] Fig.17 A schematic diagram showing a structure in which a boss is provided on the bottom wall of a notch according to an embodiment of the present application is shown;

[0049] Fig.18 A schematic diagram of a module of an electric device according to an embodiment of the present application is shown;

[0050] Description of main component symbols:

[0051] Electrode assembly 10, shell 20, sealing material 30, high temperature protection material 40, electrochemical device 100, cathode ear 101, anode ear 102, cathode sheet 103, anode sheet 104, isolation membrane 105, first shell 201, second shell 202, notch 220, electrical device 200, side wall 2020, bottom wall 2022, first side wall 2010, first bottom wall 2012, second side wall 2024, second bottom wall 2026, pit 2201, boss 2203. DETAILED DESCRIPTION

[0052] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0053] Reference below Figure 1-Figure 17 The electrochemical device 100 according to the embodiment of the present application is described in detail.

[0054] like Figure 1-3 As shown, the electrochemical device 100 according to the embodiment of the present application includes an electrode assembly 10 and a housing 20. The electrode assembly 10 is accommodated in the housing 20. Figure 2As shown, the electrode assembly 10 may include a cathode ear 101, an anode ear 102, a cathode sheet 103, an anode sheet 104, and a separator 105. The separator 105 is disposed between the cathode sheet 103 and the anode sheet 104, the cathode ear 101 is electrically connected to the cathode current collector of the cathode sheet 103, and the anode ear 102 is electrically connected to the anode current collector of the anode sheet 104. The electrode assembly may be a wound cell formed by winding the cathode sheet 103, the anode sheet 104, and the separator 105, or may be a laminated cell formed by stacking the cathode sheet 103, the anode sheet 104, and the separator 105.

[0055] The cathode ear 101 and the anode ear 102 may be made of electrolyte-resistant conductive materials such as steel alloy, aluminum alloy, iron alloy, copper alloy, and nickel alloy. The cathode current collector of the cathode sheet 103 is copper foil, and the anode current collector of the anode sheet 104 is aluminum foil.

[0056] In some embodiments, the cathode ear 101 may be electrically connected to the cathode current collector of the cathode sheet 103 by welding, or other connection methods (such as conductive adhesive bonding), and the cathode ear 101 may also be directly cut from the cathode current collector of the cathode sheet 103. The anode ear 102 may be electrically connected to the anode current collector of the anode sheet 104 by welding, or other connection methods (such as conductive adhesive bonding), and the anode ear 102 may also be directly cut from the anode current collector of the anode sheet 104.

[0057] In some embodiments, Figure 1 As shown, the housing 20 includes a first housing 201 and a second housing 202. At least one of the first housing 201 and the second housing 202 is provided with a notch 220, that is, the notch 220 can be provided only on the first housing 201, the notch 220 can also be provided only on the second housing 202, or the notch 220 can also be provided on both the first housing 201 and the second housing 202 (such a setting method can be: a first sub-notch is provided on the first housing 201, a second sub-notch is provided on the second housing 202, and the first sub-notch and the second sub-notch together form the notch 220).

[0058] In some embodiments, Figure 1As shown, the cathode ear 101 and the anode ear 102 can be extended to the outside of the shell 20 through a notch 220 respectively. In other embodiments, the cathode ear 101 and the anode ear 102 can also be extended to the outside of the shell 20 through the same notch 220. That is, when the cathode ear 101 and the anode ear 102 extend to the outside of the shell 20 through the same notch 220, the shell 20 only needs to be provided with one notch 220, and when the cathode ear 101 and the anode ear 102 extend to the outside of the shell 20 through one notch 220 respectively, the shell 20 needs to be provided with two notches 220. In order to isolate the inner cavity of the shell 20 from the outer surface of the shell 20 and ensure the electrochemical stability of the electrode assembly 10 in the shell 20, the notch 220 is also filled with a sealing material 30.

[0059] In some embodiments, the sealing material 30 can be an elastic sealing material or an adhesive. The elastic sealing material may optionally have the following material properties: resistance to electrolyte corrosion, good dielectric resistance, oxidation resistance, aging resistance, high temperature resistance, the material itself is dense, the air permeability is low, it has a good insulation effect, the material is compressible, and it has good mechanical properties and processing properties. The elastic sealing material may be selected from any one of polypropylene, polycarbonate, polyamide, polystyrene, fluororubber, and soluble polytetrafluoroethylene. The adhesive may optionally have the following properties: resistance to electrolyte corrosion, oxidation resistance, aging resistance, good adhesion to metal or plastic, good water-proof performance, the adhesive itself is dense, has a good insulation effect, and has good high temperature resistance. The adhesive may be selected from any one of polypropylene hot melt adhesive, phenolic resin adhesive, and epoxy adhesive.

[0060] In some embodiments, the first shell 201 and the second shell 202 can be processed by injection molding, machining, stamping, etc. The dimensions of the first shell 201 and the second shell 202 can be set according to the actual design requirements of the electrochemical device 100, and are not limited here. The material of the first shell 201 and the material of the second shell 202 can both be selected as electrolyte-resistant materials, and can be selected from any one of steel alloys, aluminum alloys, iron alloys, copper alloys, liquid crystal polymers, parahydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, acrylonitrile-butadiene-styrene copolymer, polycarbonate, and polyamide. The cross-sectional shape of the first shell 201 and the cross-sectional shape of the second shell 202 can be the same. The cross-sectional shapes of the first shell 201 and the second shell 202 can both be circular, quadrilateral, arc, elliptical, triangular, polygonal (greater than four sides), irregular shapes, etc. As Figure 4a As shown in FIG. 1 , the cross-sectional shape of the housing 20 is shown to be circular. Figure 4b As shown, the cross-sectional shape of the housing 20 is schematically shown to be a square. Figure 4c As shown, the cross-sectional shape of the housing 20 is illustrated as an irregular shape.

[0061] In some embodiments, the first shell 201 and the second shell 202 can be connected into a whole by gluing, heat sealing, welding and other processing techniques to form the shell 20. If the sealing material 30 is an elastic sealing material, in the process of processing the first shell 201 and the second shell 202 to form a whole, the elastic sealing material in the notch 220 can be tightly compressed (the compression ratio can be 10-40%), and the compressed elastic sealing material can completely fill the notch 220, so that the first shell 201, the second shell 202, the tabs in the notch 220 and the elastic sealing material form a sealing structure. If the sealing material 30 is an adhesive, in the process of processing the first shell 201 and the second shell 202 to form a whole, the adhesive can fill the notch 220, so that the first shell 201, the second shell 202, the tabs in the notch 220 and the adhesive form a sealing structure of the electrochemical device 100.

[0062] In some embodiments, the housing 20 also includes a housing formed by assembling three or more housing parts. For example, the housing 20 includes an independent first housing, a second housing, and a third housing, the first housing is a top cover of the housing 20, the second housing is a side wall of the housing 20, and the third housing is a bottom cover of the housing 20. The first housing, the second housing, and the third housing are sequentially connected to form the housing 20. For another example, the housing 20 includes an independent first housing, a second housing, a third housing, and a fourth housing, the first housing is a top cover of the housing 20, the second housing is a first side wall of the housing 20, the second housing is a second side wall of the housing 20, and the fourth housing is a bottom cover of the housing 20. The first housing, the second housing, the third housing, and the fourth housing are sequentially connected to form the housing 20.

[0063] The electrochemical device 100 of the embodiment of the present application provides a notch on the shell to lead out the tab and fills the notch with sealing material. The sealing structure is simple and reliable and occupies little shell space, thereby improving the energy density of the electrochemical device.

[0064] like Figure 5a As shown, the housing 20 includes a first housing 201 and a second housing 202. The first housing 201 is the top cover of the housing 20, and the second housing 202 includes a side wall 2020 and a bottom wall 2022 connected to the side wall 2020. The side wall 2020 can be a circular side wall, a quadrilateral side wall, a polygonal side wall (more than four sides), an irregular side wall, etc. Figure 5bAs shown, the notch 220 is provided on the second shell 202, and the shape of the notch 220 can be rectangular. Since the first shell 201 is a top cover, the first shell 201 is not provided with a notch. The cathode ear 101 extends from the notch 220 to the outside of the shell 20, and the sealing material 30 (such as fluororubber) is provided in the notch 220. The first shell 201 and the second shell 202 are connected in an upper and lower manner, and the contact surfaces of the first shell 201 and the second shell 202 are both planes.

[0065] When assembling the shell, the second shell 202 can be first placed on the platform fixture and fixed, and then the first shell 201 can be placed on the top of the second shell 202, and external pressure is applied to the first shell 201, at this time, the first shell 201 will be tightly attached to the second shell 202, and then one or more processes such as gluing process, heat sealing process, and welding process are used to connect the first shell 201 and the second shell 202 into a whole. At the same time, the fluororubber at the notch 220 will be tightly compressed (the compression ratio can reach 10-40%), and the compressed fluororubber can completely fill the notch 220, thereby isolating the inner cavity of the shell 20 from the outer surface of the shell 20, and ensuring the electrochemical stability of the electrode assembly 10 in the shell 20.

[0066] like Figure 6 As shown, the housing 20 includes a first housing 201 and a second housing 202. The first housing 201 and the second housing 202 both include side walls and bottom walls connected to the side walls. Specifically, the first housing 201 includes a first side wall 2010 and a first bottom wall 2012 connected to the first side wall 2010, and the second housing 202 includes a second side wall 2024 and a second bottom wall 2026 connected to the second side wall 2024. The notch 220 is provided on the second housing 202.

[0067] In some embodiments, when the first shell 201 includes a side wall, the first shell 201 may also be provided with a first notch, and the second shell 202 may be provided with a second notch corresponding to the first notch, and the first notch and the second notch together form the notch 220. When assembling the shells, the second shell 202 may be first placed on a platform fixture for fixing, and then the first shell 201 may be placed above the second shell 202 and it is necessary to ensure that the first notch of the first shell 201 is aligned with the second notch of the second shell, and then external pressure is applied to the first shell 201, at which time the first shell 201 will be tightly attached to the second shell 202, and finally one or more combinations of adhesive processes, heat sealing processes, and welding processes are used to connect the first shell 201 and the second shell 202 into a whole.

[0068] like Figure 7As shown, the housing 20 includes a first housing 201 and a second housing 202. The first housing 201 is the top cover of the housing 20, and the second housing 202 includes a side wall 2020 and a bottom wall 2022 connected to the side wall 2020. The first housing 201 and the second housing 202 are connected in an up-and-down manner, and an L-shaped step portion L1 is provided on the side wall 2020 of the second housing 202. The L-shaped step portion L1 is used to support the first housing 20.

[0069] In some embodiments, the L-shaped step portion L1 may include a first horizontal portion L11, a first vertical portion L12, and a second horizontal portion L13. The L-shaped step portion L1 formed by the first horizontal portion L11, the first vertical portion L12, and the second horizontal portion L13 is in a one-step shape.

[0070] like Figure 8 As shown, the housing 20 includes a first housing 201 and a second housing 202. The second housing 202 includes a side wall 2020 and a bottom wall 2022 connected to the side wall 2020. The first housing 201 and the second housing 202 are connected in an up-and-down manner, and a first L-shaped step portion L1a is provided on the first housing 201, and a second L-shaped step portion L1b corresponding to the first L-shaped step portion L1a is provided on the second housing 202. The first L-shaped step portion L1a is mortise-jointed with the second L-shaped step portion L1b.

[0071] In some embodiments, the first L-shaped step portion L1a and the second L-shaped step portion L1b may have the same number of steps. The first L-shaped step portion L1a and the second L-shaped step portion L1b may be in a one-step shape or a two-step or more-step shape.

[0072] In other embodiments, the step portions L1 , L1 a and L1 b are not limited to the L-shape, and may be other shapes with steps.

[0073] Fig. 9 The structure of the housing 20 shown in FIG. 5 is the same as that of the housing 20 shown in FIG. 5 , except that the first housing 201 and the second housing 202 are connected in a left-right manner, which will not be described in detail herein.

[0074] Fig.10 The housing 20 shown is Figure 6 The structures of the shells 20 shown are the same, except that the first shell 201 and the second shell 202 are connected in a left-right manner, which will not be described in detail here.

[0075] like Fig.11As shown, the slot 220 includes only the cathode ear 101 as an example for explanation, the sealing material 30 can be preliminarily formed into a structure on the cathode ear 101 by any one of a gluing process, a hot melt process, a welding process, and an injection molding process, and then the structure is placed in the slot 220. When the shell is assembled, the structure will be tightly compressed and deformed, and the compressed sealing material 30 can completely fill the slot 220, thereby isolating the inner cavity of the shell 20 from the outer surface of the shell 20.

[0076] like Fig.12 As shown, since the melting point of the sealing material is generally 150 degrees Celsius, in order to prevent the sealing material 30 from being damaged by the high temperature of welding during the process of welding and assembling the first shell 201 and the second shell 202 to form the shell 20, a structure consisting of the sealing material 30 and the high temperature protective material 40 can also be formed on the cathode ear 101 in advance. By wrapping a layer of high temperature protective material 40 on the outer surface of the sealing material 30, the high temperature damage of the sealing material 30 during welding can be avoided. When the shell is assembled, the structure will be tightly compressed and deformed, and the compressed sealing material 30 can fill the notch 220, and the wall of the notch 220 and the sealing material 30 are filled with the high temperature protective material 40 to avoid the high temperature damage of the sealing material 30 during welding. Since the welding temperature of the first shell 201 and the second shell 202 during the process of welding and assembling the shell 20 is nearly 300 degrees Celsius, the melting point of the high temperature protective material 40 can be selected to be greater than or equal to 300 degrees Celsius.

[0077] In some embodiments, the high temperature protection material 40 can be selected from any one of steel alloy, aluminum alloy, iron alloy, copper alloy, liquid crystal polymer, parabenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyamide, and polystyrene.

[0078] In some embodiments, the cathode ear 101, the sealing material 30 and the high temperature protection material 40 can form a structure with m layers, and the combination order of each layer of materials can be determined according to actual needs, but the material of the outermost layer of the structure needs to be the high temperature protection material 40, and m can be selected as a positive integer greater than or equal to 3 and less than or equal to 10. For example, the structure formed by the cathode ear 101, the sealing material 30 and the high temperature protection material 40 is 3 layers, the first layer is the cathode ear 101, the second layer is the sealing material 30, and the third layer is the high temperature protection material 40. The structure formed by the cathode ear 101, the sealing material 30 and the high temperature protection material 40 is 5 layers, the first layer is the cathode ear 101, the second layer is the sealing material 30, the third layer is the high temperature protection material 40, the fourth layer is the sealing material 30, and the fifth layer is the high temperature protection material 40.

[0079] like Fig.13 and Fig.14 As shown, when the cathode ear 101 and the anode ear 102 do not share a notch 220 , the cathode ear 101 and the anode ear 102 may extend from different sides of the housing 20 .

[0080] like Figure 1 As shown, in some embodiments, when the cathode ear 101 and the anode ear 102 do not share a notch 220 , the cathode ear 101 and the anode ear 102 may also extend from the same side of the housing 20 .

[0081] like Fig.15 As shown, the sealing material 30 is an adhesive. When assembling the shell, the second shell 202 can be placed on the platform fixture and fixed, and then the first shell 201 can be placed on the top of the second shell 202, and external pressure is applied to the first shell 201. At this time, the first shell 201 will be tightly attached to the second shell 202, and then one or more processes such as gluing, heat sealing, and welding are used to connect the first shell 201 and the second shell 202 into a whole. The adhesive can fill the notch 220 and the area around the notch on the outside of the shell 20, thereby isolating the inner cavity of the shell 20 from the outer surface of the shell 20, thereby ensuring the electrochemical stability of the electrode assembly 10 in the shell 20.

[0082] like Fig.16 As shown, in order to improve the sealing reliability of the sealing material 30, a pit 2201 is provided on the bottom wall of the groove 220, and a boss corresponding to the pit 2201 can be provided on the sealing material 30. The boss is engaged with the pit 2201 to form a limiting structure between the sealing material 30 and the groove 220, so that the sealing material 30 is firmly fixed in the groove 220.

[0083] like Fig.17 As shown, in order to improve the sealing reliability of the sealing material 30, a boss 2203 may be provided on the bottom wall of the groove 220, and a pit corresponding to the boss 2203 may be provided on the sealing material 30. The boss 2203 is engaged with the pit to form a limiting structure for the sealing material 30, so that the sealing material 30 is firmly fixed in the groove 220.

[0084] In addition, if Fig.18 As shown, the present application also discloses an electric device 200, which includes the electrochemical device 100 in any of the above cases. The electric device 200 can be an electric motorcycle, an electric bicycle, an electric power tool, an electric car, a drone, a mobile phone, a tablet computer, a personal digital assistant, a personal computer, or any other suitable rechargeable device.

[0085] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0087] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electrochemical device, comprising an electrode assembly and a housing for accommodating the electrode assembly, characterized in that: The shell includes a first shell and a second shell, the first shell and the second shell are metal shells, and the first shell is welded to the second shell, at least one of the first shell and the second shell is provided with a notch, the electrode assembly includes a tab, the tab extends from the notch to the outside of the shell, and the notch is filled with a sealing material; The first shell is a top cover of the shell, and the second shell includes a second side wall and a second bottom wall connected to the second side wall; The first shell and the second shell are fixedly connected up and down, the first shell is provided with a first L-shaped step portion, the second side wall of the second shell is provided with a second L-shaped step portion corresponding to the first L-shaped step portion, and the first L-shaped step portion and the second L-shaped step portion are mortise-jointed; One of the groove wall of the groove and the sealing material is provided with a boss, and the other is provided with a pit, and the boss is engaged with the pit.

2. The electrochemical device according to claim 1, characterized in that The sealing material is an elastic sealing material or an adhesive.

3. The electrochemical device according to claim 2, characterized in that The adhesive includes any one of polypropylene hot melt adhesive, phenolic resin adhesive and epoxy adhesive.

4. The electrochemical device according to claim 2, characterized in that The elastic sealing material includes any one of polypropylene, polycarbonate, polyamide, polystyrene, fluororubber, and soluble polytetrafluoroethylene.

5. The electrochemical device according to claim 1, characterized in that The first shell is not provided with the notch, and the second shell is provided with the notch.

6. The electrochemical device according to claim 1, wherein: The first shell is provided with a first notch, and the second shell is provided with a second notch corresponding to the first notch, and the notch is formed by surrounding the first notch and the second notch.

7. The electrochemical device according to claim 1, characterized in that The shell also includes a third shell, the first shell is the top cover of the shell, the second shell is the side wall of the shell, the third shell is the bottom cover of the shell, and the first shell, the second shell and the third shell are connected in sequence to form the shell.

8. The electrochemical device according to claim 1, wherein A high-temperature protective material is filled between the groove wall of the groove and the sealing material, and the pole ear, the sealing material and the high-temperature protective material form an m-layer structure in the groove, wherein the material of the outermost layer of the structure is the high-temperature protective material, and m is a positive integer greater than or equal to 3 and less than or equal to 10.

9. The electrochemical device according to claim 8, characterized in that The melting point of the high temperature protection material is greater than or equal to 300 degrees Celsius.

10. The electrochemical device according to claim 8, characterized in that The high temperature protection material includes any one of steel alloy, aluminum alloy, iron alloy, copper alloy, liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyamide, and polystyrene.

11. The electrochemical device according to claim 1, wherein The material of the first shell and the second shell includes any one of steel alloy, aluminum alloy, iron alloy and copper alloy.

12. The electrochemical device according to claim 1, wherein The electrode assembly includes two electrode tabs, and both of the electrode tabs extend from the notch to the outside of the shell.

13. The electrochemical device according to claim 1, wherein The electrode assembly includes a cathode sheet, an anode sheet, a separator and two tabs. The separator is arranged between the cathode sheet and the anode sheet. The two tabs are electrically connected to the cathode current collector of the cathode sheet and the anode current collector of the anode sheet respectively.

14. The electrochemical device according to claim 13, characterized in that The two pole tabs extend from the same side of the housing, or the two pole tabs extend from different sides of the housing.

15. The electrochemical device according to claim 1, wherein The shape of the notch is rectangular.

16. An electrical device, characterized in that: Comprising the electrochemical device according to any one of claims 1 to 15.

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