Patent Publication Number: US-2023133112-A1

Title: Electrochemical device and electrical device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation application of International Application No. PCT/CN2020/099933, filed on Jul. 2, 2020, the content of which is incorporated herein by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     This application relates to an electrochemical device and an electrical device. 
     BACKGROUND 
     Electrochemical devices are rechargeable and dischargeable, and have been widely used in consumer products, digital products, power products, medical treatment, security protection, and other fields. A conventional process used to lead out an electrode in an existing electrochemical device is: making a through-hole on a sidewall of a housing first, and then disposing an electrode post in the through-hole, and sealing the through-hole with an insulating pad, where one end of the electrode post inside the housing is electrically connected to a tab, and the other end of the electrode post is located outside the housing and configured to be connected to an external electronic device. Such a sealing structure occupies a relatively large internal space of the electrochemical device, and results in a considerable loss of an energy density of the electrochemical device. In addition, the sealing structure is rather complicated, costly for processing, and of low reliability. 
     SUMMARY 
     This application aims to solve at least one of technical problems in the related art. For this purpose, one aspect of this application is to disclose an electrochemical device. A tab is led out through a notch provided on a housing of the electrochemical device, and the sealing is implemented by filling the notch with a sealing material. The sealing structure is simple and highly reliable. 
     The electrochemical device according to an embodiment of this application includes an electrode assembly and a housing for accommodating the electrode assembly. The housing includes a first housing body and a second housing body fixedly connected to the first housing body. A notch is provided on at least one of the first housing body or the second housing body. The electrode assembly includes a tab, and the tab protrudes out of the housing from the notch. The notch is filled with a sealing material. 
     In some embodiments, the sealing material includes an elastic sealing material or a binder. 
     In some embodiments, the binder includes any one of polypropylene hot-melt adhesive, phenolic resin adhesive, or epoxy adhesive. 
     In some embodiments, the elastic sealing material includes any one of polypropylene, polycarbonate, polyamide, polystyrene, fluororubber, or soluble polytetrafluoroethylene. 
     In some embodiments, the notch is not provided on the first housing body, but the notch is provided on the second housing body. 
     In some embodiments, the first housing body is a top cover of the housing, and the second housing body includes a sidewall and a bottom wall connected to the sidewall. 
     In some embodiments, a stepped portion is disposed on the sidewall, and the stepped portion is configured to hold the top cover. 
     In some embodiments, a first stepped portion is disposed on the sidewall. A second stepped portion corresponding to the first stepped portion is disposed on the top cover. The first housing body is connected to the second housing body by the first stepped portion and the second stepped portion to form the housing. 
     In some embodiments, a first notch is provided on the first housing body. A second notch corresponding to the first notch is provided on the second housing body. The first notch and the second notch together form the notch. 
     In some embodiments, the first housing body includes a first sidewall and a first bottom wall connected to the first sidewall. The second housing body includes a second sidewall and a second bottom wall connected to the second sidewall. 
     In some embodiments, a first stepped portion is disposed on the first sidewall. A second stepped portion corresponding to the first stepped portion is disposed on the second sidewall. The first housing body is connected to the second housing body by the first stepped portion and the second stepped portion to form the housing. 
     In some embodiments, the housing further includes a third housing body. The first housing body is a top cover of the housing. The second housing body is a sidewall of the housing. The third housing body is a bottom cover of the housing. The first housing body, the second housing body, and the third housing body are sequentially connected to form the housing. 
     In some embodiments, a wall of the notch and the sealing material are interspaced with a high-temperature protection material. The tab, the sealing material, and the high-temperature protection material form an m-layer structure in the notch, where an outermost layer of the structure is made of the high-temperature protection material, and m is a positive integer greater than or equal to 3 and less than or equal to 10. 
     In some embodiments, a melting point of the high-temperature protection material is greater than or equal to 300° C. 
     In some embodiments, the high-temperature protection material includes any one of a steel alloy, an aluminum alloy, an iron alloy, a copper alloy, a liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, poly(acrylonitrile-co-butadiene-co-styrene), polycarbonate, polyamide, or polystyrene. 
     In some embodiments, the first housing body and the second housing body are fixedly connected in a vertical direction or a horizontal direction. 
     In some embodiments, the first housing body and the second housing body are fixedly connected together by at least one of gluing, heat sealing, or welding. 
     In some embodiments, both the first housing body and the second housing body are made of a material that includes any one of a steel alloy, an aluminum alloy, an iron alloy, a copper alloy, a liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, poly(acrylonitrile-co-butadiene-co-styrene), polycarbonate, or polyamide. 
     In some embodiments, the electrode assembly includes two tabs, and the two tabs protrude out of the housing from the notch. 
     In some embodiments, the electrode assembly includes a positive electrode plate, a negative electrode plate, a separator, and two tabs. The separator is disposed between the positive electrode plate and the negative electrode plate. The two tabs are electrically connected to a positive current collector of the positive electrode plate and a negative current collector of the negative electrode plate respectively. 
     In some embodiments, the two tabs protrude from a same side of the housing, or the two tabs protrude from different sides of the housing. 
     In some embodiments, the notch is in a rectangular shape. 
     In some embodiments, a boss is disposed on one wall of the notch or the sealing material, a dent is disposed on an other wall of the notch or the sealing material. The boss is snap-fitted to the dent. 
     The stepped portion, the first stepped portion, and the second stepped portion are all L-shaped. 
     Another aspect of this application discloses an electrical device. The electrical device includes the electrochemical device. The electrochemical device includes an electrode assembly and a housing for accommodating the electrode assembly. The housing includes a first housing body and a second housing body fixedly connected to the first housing body. A notch is provided on at least one of the first housing body or the second housing body. The electrode assembly includes a tab. The tab protrudes out of the housing from the notch. The notch is filled with a sealing material. 
     In the electrochemical device according to some embodiments of this application, the tab is led out through the notch provided on the housing of the electrochemical device, and the sealing is implemented by filling the notch with the sealing material. The sealing structure is simple and highly reliable, and this sealing method is space-efficient, and increases the energy density of the electrochemical device. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and/or additional aspects and advantages of this application will become evident and easily comprehensible through the description of some embodiments with reference to the drawings outlined below: 
         FIG.  1    is a schematic structural diagram of an electrochemical device according to an embodiment of this application; 
         FIG.  2    is a schematic structural diagram of an electrode assembly according to an embodiment of this application; 
         FIG.  3    is a close-up view of a notch filled with a sealing material according to an embodiment of this application; 
         FIG.  4 A ,  FIG.  4 B  and  FIG.  4 C  are schematic structural diagrams of a cross section of a housing according to an embodiment of this application; 
         FIG.  5 A  is a schematic structural diagram of vertical connection between a first housing body and a second housing body according to an embodiment of this application; 
         FIG.  5 B  is a schematic structural diagram of a notch provided on a sidewall of a second housing body according to an embodiment of this application; 
         FIG.  6    is a schematic structural diagram of vertical connection between a first housing body and a second housing body according to another embodiment of this application; 
         FIG.  7    is a schematic structural diagram of an L-shaped stepped portion disposed on a second housing body alone according to an embodiment of this application; 
         FIG.  8    is a schematic structural diagram of an L-shaped stepped portion disposed on both a first housing body and a second housing body according to an embodiment of this application; 
         FIG.  9    is a schematic structural diagram of horizontal connection between a first housing body and a second housing body according to an embodiment of this application; 
         FIG.  10    is a schematic structural diagram of horizontal connection between a first housing body and a second housing body according to another embodiment of this application; 
         FIG.  11    is a schematic structural diagram of a structure formed by a sealing material and a positive tab according to an embodiment of this application; 
         FIG.  12    is a schematic structural diagram of a structure formed by a sealing material, a high-temperature protection material, and a positive tab according to an embodiment of this application; 
         FIG.  13    is a schematic structural diagram of a positive tab and a negative tab that protrude from different sides of a housing according to an embodiment of this application; 
         FIG.  14    is a schematic structural diagram of a positive tab and a negative tab that protrude from a same side of a housing according to an embodiment of this application; 
         FIG.  15    is a schematic structural diagram of a notch filled with a binder according to an embodiment of this application; 
         FIG.  16    is a schematic structural diagram of a dent disposed on a bottom wall of a notch according to an embodiment of this application; 
         FIG.  17    is a schematic structural diagram of a boss disposed on a bottom wall of a notch according to an embodiment of this application; and 
         FIG.  18    is a schematic modular diagram of an electrical device according to an embodiment of this application. 
     
    
    
     Reference numerals of main components: 
     electrode assembly  10 , housing  20 , sealing material  30 , high-temperature protection material  40 , electrochemical device  100 , positive tab  101 , negative tab  102 , positive electrode plate  103 , negative electrode plate  104 , separator  105 , first housing body  201 , second housing body  202 , notch  220 , electrical device  200 , sidewall  2020 , bottom wall  2022 , first sidewall  2010 , first bottom wall  2012 , second sidewall  2024 , second bottom wall  2026 , dent  2201 , boss  2203 . 
     DETAILED DESCRIPTION 
     The following describes some embodiments of this application in detail. Examples of the embodiments are shown in the drawings, throughout which the same or similar reference numerals represent the same or similar components or the components of the same or similar functions. The embodiments described below with reference to the drawings are illustrative, and are merely intended to construe this application but not to limit this application. 
     The following describes in detail an electrochemical device  100  according to an embodiment of this application with reference to  FIG.  1    to  FIG.  17   . 
     As shown in  FIG.  1    to  FIG.  3   , the electrochemical device  100  according to an embodiment of this application includes an electrode assembly  10  and a housing  20 . The electrode assembly  10  is accommodated in the housing  20 . As shown in  FIG.  2   , the electrode assembly  10  may include a positive tab  101 , a positive tab  102 , a positive electrode plate  103 , a negative electrode plate  104 , and a separator  105 . The separator  105  is disposed between the positive electrode plate  103  and the negative electrode plate  104 . The positive tab  101  is electrically connected to the positive current collector of the positive electrode plate  103 . The negative tab  102  is electrically connected to the negative current collector of the negative electrode plate  104 . The electrode assembly may be a jelly-roll electrode assembly formed by winding the positive electrode plate  103 , the negative electrode plate  104 , and the separator  105 , or a stacked-type electrode assembly formed by stacking the positive electrode plate  103 , the negative electrode plate  104 , and the separator  105 . 
     The positive tab  101  and the negative tab  102  may be made of an electrolyte-resistant conductive material such as a steel alloy, an aluminum alloy, an iron alloy, a copper alloy, or a nickel alloy. The positive current collector of the positive electrode plate  103  is an aluminum foil, and the negative current collector of the negative electrode plate  104  is a copper foil. 
     In some embodiments, the positive tab  101  is electrically connected to the positive current collector of the positive electrode plate  103  by welding or by other connection means (such as conductive adhesive tape). Alternatively, the positive tab  101  may be directly formed by cutting the positive current collector of the positive electrode plate  103 . The negative tab  102  is electrically connected to the negative current collector of the negative electrode plate  104  by welding or by other connection means (such as conductive adhesive tape). Alternatively, the negative tab  102  may be directly formed by cutting the negative current collector of the negative electrode plate  104 . 
     In some embodiments, as shown in  FIG.  1   , the housing  20  includes a first housing body  201  and a second housing body  202 . A notch  220  is disposed on at least one of the first housing body  201  or the second housing body  202 . To be specific, the notch  220  may be disposed on the first housing body  201  alone, the notch  220  may be disposed on the second housing body  202  alone, and the notch  220  may be disposed on both the first housing body  201  and the second housing body  202  (this configuration may be: a first semi-notch is disposed on the first housing body  201 , a second semi-notch is disposed on the second housing body  202 , and the first semi-notch and the second semi-notch combine to form the notch  220 ). 
     In some embodiments, as shown in  FIG.  1   , the positive tab  101  and the negative tab  102  may protrude out of the housing  20  through separate notches  220 . In other embodiments, the positive tab  101  and the negative tab  102  may protrude out of the housing  20  through the same notch  220 . To be specific, when the positive tab  101  and the negative tab  102  protrude out of the housing  20  through the same notch  220 , only one notch  220  needs to be disposed on the housing  20 . When the positive tab  101  and the negative tab  102  protrude out of the housing  20  through separate notches  220 , two notches  220  need to be disposed on the housing  20 . To isolate a cavity of the housing  20  from an outer surface of the housing  20  and ensure electrochemical stability of the electrode assembly  10  in the housing  20 , the notch  220  is filled with a sealing material  30 . 
     In some embodiments, the sealing material  30  may be an elastic sealing material or a binder. The elastic sealing material optionally possesses the following properties: resistance to electrolyte corrosion, favorable resistance to media corrosion, oxidation resistance, aging resistance, high-temperature resistance, high inherent packing density of the material, low air permeability, favorable insulation effects, material compressibility, and favorable mechanical properties and processing properties. The elastic sealing material may be any one selected from polypropylene, polycarbonate, polyamide, polystyrene, fluororubber, and soluble polytetrafluoroethylene. The binder optionally possesses the following properties: resistance to electrolyte corrosion, oxidation resistance, aging resistance, favorable performance of bonding to metal or plastic, favorable water-proof performance, high inherent packing density of the binder, favorable insulation effects, and favorable high-temperature resistance. The binder may be any one selected from polypropylene hot-melt adhesive, phenolic resin adhesive, or epoxy adhesive. 
     In some embodiments, the first housing body  201  and the second housing body  202  may be prepared by injection molding, machining, stamping, or other processing methods. The dimensions of the first housing body  201  and the second housing body  202  may be set according to the actual design requirements of the electrochemical device  100 , without being limited herein. Both the first housing body  201  and the second housing body  202  are optionally made of an electrolyte-resistant material that may be any one selected from a steel alloy, an aluminum alloy, an iron alloy, a copper alloy, a liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, poly(acrylonitrile-co-butadiene-co-styrene), polycarbonate, and polyamide. Optionally, the cross-sectional shape of the first housing body  201  is the same as the cross-sectional shape of the second housing body  202 . The cross-sectional shape of both the first housing body  201  and the second housing body  202  may be circular, quadrilateral, arc-shaped, elliptical, triangular, polygonal (with more than four sides), irregular, or the like.  FIG.  4 A  shows a cross-sectional shape of the housing  20  as circular.  FIG.  4 B  shows a cross-sectional shape of the housing  20  as rectangular.  FIG.  4 C  shows a cross-sectional shape of the housing  20  as irregular. 
     In some embodiments, the first housing body  201  and the second housing body  202  may be connected as a whole by gluing, heat sealing, welding, or other processing techniques to form the housing  20 . If the sealing material  30  is an elastic sealing material, during processing of the first housing body  201  and the second housing body  202  to form a whole, the elastic sealing material in the notch  220  may be tightly compressed (at a compression ratio of 10% to 40%). The compressed elastic sealing material may fully fill the notch  220 . In this way, the first housing body  201 , the second housing body  202 , and the tabs and the elastic sealing material in the notch  220  form a sealing structure. If the sealing material  30  is a binder, during processing of the first housing body  201  and the second housing body  202  to form a whole, the binder may fill the notch  220 . In this way, the first housing body  201 , the second housing body  202 , and the tabs and the binder in the notch  220  form a sealing structure of the electrochemical device  100 . 
     In some embodiments, the housing  20  may be formed by assembling three or more housing parts. For example, the housing  20  includes a first housing body, a second housing body, and a third housing body that are stand-alone. The first housing body is a top cover of the housing  20 , the second housing body is a sidewall of the housing  20 , and the third housing body is a bottom cover of the housing  20 . The first housing body, the second housing body, and the third housing body are sequentially connected to form the housing  20 . As another example, the housing  20  includes a first housing body, a second housing body, a third housing body, and a fourth housing that are stand-alone. The first housing body is a top cover of the housing  20 , the second housing body is a first sidewall of the housing  20 , the third housing body is a second sidewall of the housing  20 , and the fourth housing is a bottom cover of the housing  20 . The first housing body, the second housing body, the third housing body, and the fourth housing are sequentially connected to form the housing  20 . 
     In the electrochemical device  100  according to this embodiment of this application, the tab is led out through the notch provided on the housing, and the notch is filled with the sealing material. The sealing structure is simple and highly reliable, and occupies little space in the housing, thereby increasing the energy density of the electrochemical device. 
     As shown in  FIG.  5 A , the housing  20  includes a first housing body  201  and a second housing body  202 . The first housing body  201  is a top cover of the housing  20 , and the second housing body  202  includes a sidewall  2020  and a bottom wall  2022  connected to the sidewall  2020 . The sidewall  2020  may be a circular sidewall, a quadrangular sidewall, a polygonal sidewall (with more than four sides), an irregular sidewall, or the like. As shown in  FIG.  5 B , the notch  220  is provided on the second housing body  202 . The shape of the notch  220  may be a rectangle. Because the first housing body  201  is a top cover, no notch is provided on the first housing body  201 . The positive tab  101  protrudes out of the housing  20  from the notch  220 , and the sealing material  30  (such as fluororubber) is disposed in the notch  220 . The first housing body  201  and the second housing body  202  are connected in a vertical direction, and a contact face between the first housing body  201  and the second housing body  202  is a plane. 
     A process of assembling the housing may be: fixing the second housing body  202  onto a workbench jig first, and then placing the first housing body  201  on the second housing body  202 , and exerting an external pressure on the first housing body  201  so that the first housing body  201  fits the second housing body  202  closely; and subsequently, connecting the first housing body  201  and the second housing body  202  to form a whole by gluing, heat sealing, welding, or one or more thereof. At the same time, the fluororubber at the notch  220  is compressed tightly (at a compression ratio of 10% of 40%). The compressed fluororubber may fully fill the notch  220 , thereby isolating the cavity of the housing  20  from the outer surface of the housing  20  and ensuring electrochemical stability of the electrode assembly  10  in the housing  20 . 
     As shown in  FIG.  6   , the housing  20  includes a first housing body  201  and a second housing body  202 . The first housing body  201  and the second housing body  202  each include a sidewall and a bottom wall connected to the sidewall. Specifically, the first housing body  201  includes a first sidewall  2010  and a first bottom wall  2012  connected to the first sidewall  2010 , and the second housing body  202  includes a second sidewall  2024  and a second bottom wall  2026  connected to the second sidewall  2024 . The notch  220  is provided on the second housing body  202 . 
     In some embodiments, when the first housing body  201  includes a sidewall, a first notch may be provided on the first housing body  201 , and a second notch corresponding to the first notch may be provided on the second housing body  202 . The first notch combines with the second notch to form the notch  220 . A process of assembling the housing may be: fixing the second housing body  202  onto a workbench jig first, and then placing the first housing body  201  on the second housing body  202  in such a way that the first notch of the first housing body  201  is aligned with the second notch of the second housing body, and exerting an external pressure on the first housing body  201  so that the first housing body  201  fits the second housing body  202  closely; and finally, connecting the first housing body  201  and the second housing body  202  to form a whole by gluing, heat sealing, welding, or one or more thereof. 
     As shown in  FIG.  7   , the housing  20  includes a first housing body  201  and a second housing body  202 . The first housing body  201  is a top cover of the housing  20 , and the second housing body  202  includes a sidewall  2020  and a bottom wall  2022  connected to the sidewall  2020 . The first housing body  201  and the second housing body  202  are connected in a vertical direction. An L-shaped stepped portion L 1  is disposed on the sidewall  2020  of the second housing body  202 . The L-shaped stepped portion L 1  is configured to hold the first housing body  20 . 
     In some embodiments, the L-shaped stepped portion L 1  may include a first horizontal portion L 11 , a first vertical portion L 12 , and a second horizontal portion L 13 . The L-shaped stepped portion L 1  formed by the first horizontal portion L 11 , the first vertical portion L 12 , and the second horizontal portion L 13  is in a one-step shape. 
     As shown in  FIG.  8   , the housing  20  includes a first housing body  201  and a second housing body  202 . The second housing body  202  includes a sidewall  2020  and a bottom wall  2022  connected to the sidewall  2020 . The first housing body  201  and the second housing body  202  are connected in a vertical direction. A first L-shaped stepped portion L 1   a  is disposed on the first housing body  201 , and a second L-shaped stepped portion L 1   b  corresponding to the first L-shaped stepped portion L 1   a  is disposed on the second housing body  202 . The first L-shaped stepped portion L 1   a  and the second L-shaped stepped portion L 1   b  are connected by a mortise-and-tenon joint. 
     In some embodiments, the number of steps of the first L-shaped stepped portion L 1   a  is optionally the same as the number of steps of the second L-shaped stepped portion L 1   b . The first L-shaped stepped portion L 1   a  and the second L-shaped stepped portion L 1   b  may be in a one-step shape, or may be in a two-step or multi-step shape. 
     In other embodiments, the shapes of the stepped portions L 1 , L 1   a , and L 1   b  are not limited to the L shape, and may be other stepped shapes. 
     The housing  20  shown in  FIG.  9    is structurally the same as the housing  20  shown in  FIG.  5    except that the first housing body  201  and the second housing body  202  are connected in a horizontal direction, details of which are omitted herein. 
     The housing  20  shown in  FIG.  10    is structurally the same as the housing  20  shown in  FIG.  6    except that the first housing body  201  and the second housing body  202  are connected in a horizontal direction, details of which are omitted herein. 
     As shown in  FIG.  11   , in an example in which the notch  220  contains only the positive tab  101 , the sealing material  30  may form a structure on the positive tab  101  beforehand by any process such as gluing, hot melting, welding, or injection molding, and then the structure is placed in the notch  220 . During assembling of the housing, the structure is compressed tightly and deformed. The compressed sealing material  30  may fully fill the notch  220 , thereby isolating the cavity of the housing  20  from the outer surface of the housing  20 . 
     As shown in  FIG.  12   , the melting point of the sealing material is generally 150° C. In order to prevent the welding heat from causing damage to the sealing material  30  in a process of welding and assembling the first housing body  201  and the second housing body  202  to form the housing  20 , a structure formed of the sealing material  30  and a high-temperature protection material  40  may be provided on the positive tab  101  beforehand. The layer of high-temperature protection material  40  that overlays the outer surface of the sealing material  30  can prevent the welding heat from damaging the sealing material  30 . In assembling the housing, the structure is tightly compressed and deformed. The compressed sealing material  30  may fill the notch  220 . The wall of the notch  220  and the sealing material  30  are interspaced with the high-temperature protection material  40  to prevent the welding heat from damaging the sealing material  30 . The welding temperature is nearly 300° C. in the process of welding and assembling the first housing body  201  and the second housing body  202  to form the housing  20 . Therefore, the melting point of the high-temperature protection material  40  is optionally greater than or equal to 300° C. 
     In some embodiments, the high-temperature protection material  40  may be any one selected from a steel alloy, an aluminum alloy, an iron alloy, a copper alloy, a liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide, poly(acrylonitrile-co-butadiene-co-styrene), polycarbonate, polyamide, and polystyrene. 
     In some embodiments, the positive tab  101 , the sealing material  30 , and the high-temperature protection material  40  may form a structure that includes m layers. The order in which different layers of materials are combined may be determined according to actual needs. However, the outermost layer of the structure needs to be the high-temperature protection material  40 , and m is optionally a positive integer greater than or equal to 3 and less than or equal to 10. For example, the structure formed by the positive tab  101 , the sealing material  30 , and the high-temperature protection material  40  includes 3 layers. The first layer is the positive tab  101 , the second layer is the sealing material  30 , and the third layer is the high-temperature protection material  40 . Alternatively, the structure formed by the positive tab  101 , the sealing material  30 , and the high-temperature protection material  40  includes 5 layers. The first layer is the positive tab  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 . 
     As shown in  FIG.  13    and  FIG.  14   , when the positive tab  101  and the negative tab  102  do not share a notch  220 , the positive tab  101  and the negative tab  102  may protrude from different sides of the housing  20 . 
     As shown in  FIG.  1   , in some embodiments, when the positive tab  101  and the negative tab  102  do not share a notch  220 , the positive tab  101  and the negative tab  102  may protrude from the same side of the housing  20 . 
     As shown in  FIG.  15   , the sealing material  30  is a binder. A process of assembling the housing may be: fixing the second housing body  202  onto a workbench jig first, and then placing the first housing body  201  on the second housing body  202 , and exerting an external pressure on the first housing body  201  so that the first housing body  201  fits the second housing body  202  closely; and subsequently, connecting the first housing body  201  and the second housing body  202  to form a whole by gluing, heat sealing, welding, or one or more thereof. The binder may fill the notch  220  and the region around the notch and outside the housing  20 , thereby isolating the cavity of the housing  20  from the outer surface of the housing  20  and ensuring electrochemical stability of the electrode assembly  10  in the housing  20 . 
     As shown in  FIG.  16   , in order to improve the sealing reliability of the sealing material  30 , a dent  2201  is disposed on the bottom wall of the notch  220 , and a boss corresponding to the dent  2201  may be disposed on the sealing material  30 . Through the snap-fit between the boss and dent  2201 , the sealing material  30  and the notch  220  form a limiting structure, so that the sealing material  30  is firmly fixed in the notch  220 . 
     As shown in  FIG.  17   , in order to improve the sealing reliability of the sealing material  30 , a boss  2203  may be disposed on the bottom wall of the notch  220 , and a dent corresponding to the boss  2203  may be disposed on the sealing material  30 . Through the snap-fit between the boss  2203  and dent, the sealing material  30  forms a limiting structure, so that the sealing material  30  is firmly fixed in the notch  220 . 
     In addition, as shown in  FIG.  18   , this application further discloses an electrical device  200 . The electrical device  200  includes the electrochemical device  100  that falls in any one of the circumstances above. The electrical device  200  may be an electric motorcycle, an electric bicycle, an electric tool, an electric vehicle, an unmanned aerial vehicle, a mobile phone, a tablet computer, a personal digital assistant, a personal computer, or any other rechargeable device as appropriate. 
     Understandably, in the description of this application, a direction or a positional relationship indicated by the terms such as “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “up”, “down”, “before”, “after”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “in”, “out”, “clockwise”, “counterclockwise”, “axial”, “radial”, and “circumferential” is a direction or positional relationship based on the illustration in the drawings, and is merely intended for ease or brevity of description of this application, but not intended to indicate or imply that the mentioned device or component must be located in the specified direction or constructed or operated in the specified direction. Therefore, such terms are not intended as a limitation on this application. In the description of this application, “a plurality of” means two or more. 
     In the description of this specification, reference to the terms “one embodiment”, “some embodiments”, “illustrative embodiment”, “example”, “specific example”, “some examples”, and the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this application. In this embodiment, an illustrative expression of such terms do not necessarily refer to an identical embodiment or example. In addition, the particular features, structures, materials, or characteristics may be combined in one or more embodiments in any appropriate manner. 
     Although some embodiments of this application are shown and described above, a person of ordinary skill in the art understands that variations, modifications, substitutions, and derivations may be made to said embodiments without departing from the principles and concept of this application. The scope of this application is subject to the claims and equivalents thereof