Patent Publication Number: US-2023155259-A1

Title: Battery cell housing, battery cell, battery, and electric device

Description:
CROSS-REFERENCE TO THE RELATED APPLICATIONS 
     This application claims the benefit of priority from the Chinese Patent Application No. 202111343660.6, filed on Nov. 13, 2021, which is hereby incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     Embodiments of the present application relate to the technical field of electronic devices, and in particular, to a battery cell housing, a battery cell, a battery, and an electric device. 
     BACKGROUND 
     In a related art, in order to output a current from an internal electrode assembly, a hole needs to be provided in an outer housing of the battery cell, which renders the battery cell housing less integral. 
     SUMMARY 
     Embodiments of the present application provide a battery cell housing, a battery cell, a battery, and an electric device, which can render the battery cell housing more integral. 
     To solve the foregoing technical problem, a technical solution used in the present application is as follows: A battery cell housing is provided, the battery cell housing defines an accommodating cavity configured to accommodate an electrode assembly, and the battery cell housing includes a first housing and a second housing. The first housing is configured to be electrically connected to a first tab of the electrode assembly. The second housing is fixed to the first housing in an insulated mariner to define the accommodating cavity, the second housing is configured to be electrically connected to a second tab of the electrode assembly, and the second tab is different from the first tab in polarity. The first housing includes a bulge configured to be electrically connected to the first tab, at least part of the bulge is exposed outside the accommodating cavity, and the bulge is configured to extend in a direction approaching the second housing. In this solution, the first housing is electrically connected to the first tab and the second housing is electrically connected to the second tab. Therefore, to meet a need of an electric connection to an external circuit, there is no need to provide a hole in the battery cell housing, and a current in the electrode assembly can be directly output to the external circuit through the first housing and the second housing, thereby rendering the battery cell housing more integral. Further, in the present application, the first housing includes a bulge, the bulge is configured to be electrically connected to an external circuit, and the bulge is configured to extend in a direction approaching the second housing, so that there is a proper distance between the bulge and the second housing, thereby facilitating an electrical connection between the battery cell and the external circuit. 
     In a further embodiment, the bulge is outside the accommodating cavity. In this solution, the bulge is positioned more flexibly, so that it is more convenient to adjust relative positions of the bulge and the second housing. 
     In a further embodiment, the battery cell housing farther includes a first insulation portion, and the first insulation portion is connected to the first housing and the second housing; and the first housing, the second housing and the first insulation portion jointly define the accommodating cavity. In this solution, when the first insulation portion is connected to the first housing and the second housing to implement insulated fixation of the first housing and the second housing, it is more convenient to connect and fix the first housing to the second housing. In addition, the insulation portion is also configured to define the accommodating cavity, which can improve an insulation effect on the first housing and the second housing. 
     In a further embodiment, the first housing includes an annular frame body electrically connected to the first tab, and the frame body includes a first port. The first insulation portion is annular and is connected to an outer peripheral edge, at the first port, of the frame body. The second housing further includes a first plate body; the first plate body is connected to a side, farther away from the frame body, of the first insulation portion and covers the first port; and the bulge is connected to the first plate body. In this solution, the first housing has the annular frame body, and one side of the first housing is connected to a plate-shaped bulge, so that the bulge can extend to be close to the frame body in a circumferential direction, and the bulge is positioned more flexibly. 
     In a further embodiment, the bulge is outside the accommodating cavity and is connected to an edge of the first plate body. In this solution, the bulge is connected to an edge of the first plate body, so that the bulge can be closer to the second housing, thereby facilitating extension of the bulge toward the second housing. 
     In a further embodiment, the bulge is configured to extend in a direction approaching the frame body. In this solution, the frame body is closer to the bulge, and when the bulge extends toward the frame body, an extension distance of the bulge can be reduced and a volume of the bulge can be decreased. 
     In a further embodiment, the bulge is spaced apart from an outer wall face of the frame body. In this solution, the bulge is spaced apart from the frame body, to implement insulation between the bulge and the frame body through a simple structure at a low cost. 
     In a further embodiment, a second insulation portion is provided between the bulge and the frame body, a side face of the second insulation portion is connected to the outer wall face of the frame body, and another side face of the second insulation portion is connected to the bulge. In this solution, the bulge is fixed to the frame body through the second insulation portion, so that the bulge is arranged in a more stable structure. 
     In a further embodiment, the first insulation portion sequentially includes a first material layer, a second material layer and a third material layer in a direction from the first plate body to the frame body; the second material layer is made of an insulation material; the first material layer and the first plate body each are made of a metal material; and the third material layer and the frame body each are made of a metal material. In this solution, the connection between the first material layer and the first plate body is more stable, and the connection between the third material layer and the frame body is more stable. That is, the insulated connection between the first housing and the second housing is more stable. 
     In a further embodiment, a connecting flange is provided at the outer peripheral edge, at the first port, of the frame body; the connecting flange extends into the accommodating cavity; and the first insulation portion is connected to a wall face, facing the first plate body, of the connecting flange. In this solution, the frame body and the first insulation portion are connected more stably due to a larger contact area therebetween. 
     In a further embodiment, the second housing further includes a second plate body, the frame body includes a second port opposite the first port, and the second plate body is connected to the frame body and covers the second port. In this solution, there is no need to provide redundant insulation portions to connect the second plate body to the frame body, and therefore, the structure is simpler. 
     In a further embodiment, a maximum thickness of the frame body is greater than that of the first plate body and the second plate body, and the maximum thickness L 1  of the frame body, the maximum thickness L 2  of the first plate body and the maximum thickness L 3  of the second plate body satisfy that 0.01 mm≤L 1 −L 2 ≤0.5 mm, and 0.01 mm≤L 1 −L 3 ≤0.5 mm. In this solution, with a greater maximum thickness of the frame body, structural strength of the battery cell housing can be ensured, and with smaller maximum thicknesses of the first plate body and the second plate body, the battery cell housing may occupy a smaller space and the electrode assembly in the battery cell housing may have a larger volume, thereby increasing the energy density of the battery cell with the battery cell housing in the present application. That is, in the foregoing solution, the structural strength of the battery cell housing can be ensured, and the energy density of the battery cell with the battery cell housing can also be improved. 
     In a further embodiment, the maximum thickness L 1  of the frame body satisfies that 0.1 mm≤L 1 ≤1 mm; the maximum thickness L 2  of the first plate body satisfies that 0.03 mm≤L 2 ≤0.6 mm; and the maximum thickness L 3  of the second plate body satisfies that 0.03 mm≤L 3 ≤0.6 mm. In this solution, with the maximum thickness L 1  within the foregoing size range, the frame body may have proper structural strength without occupying an excessively large space of the electrode assembly. With the maximum thickness L 2  within the foregoing size range, the first plate may occupy a smaller space while ensuring a basic protection effect. With the maximum thickness L 3  within the foregoing size range, the second plate body may occupy a smaller space while ensuring a basic protection effect. 
     In a further embodiment, the frame body is made of a carbon material, a metal material or a polymer material; the first plate body is made of a carbon material, a metal material or a polymer material; and the second plate body is made of a carbon material, a metal material or a polymer material. In this solution, the frame body, the first plate body and the second plate body can facilitate wiring and connection, and can also have sufficient structural strength. 
     In a further embodiment, the frame body is provided with a liquid injection hole. In this solution, the liquid injection hole is provided in a relatively thicker frame body, which can facilitate opening and sealing of the liquid injection hole. 
     In a further embodiment, the first plate body or the second plate body is provided with an explosion-proof valve. In this solution, the explosion-proof valve is arranged on the relatively thinner first plate body or second plate body, which can reduce processing difficulty of the explosion-proof valve and also improve protection performance of the explosion-proof valve. 
     A second aspect of the present application further provides a battery cell, including the battery cell housing and the electrode assembly in any one of the foregoing embodiments, the electrode assembly is provided in the accommodating cavity, the electrode assembly includes the first tab and the second tab, the first tab is electrically connected to a first housing, and the second tab is electrically connected to a second housing. 
     A third aspect of the present application further provides a battery, including the battery cell in the foregoing embodiments. 
     A fourth aspect of the present application further provides an electric device, including the battery in the foregoing embodiments. 
     In the battery cell housing provided in the present application, the first housing is electrically connected to the first tab and the second housing is electrically connected to the second tab. Therefore, there is no need to provide a hole in the battery cell housing, and a current in the battery cell housing can be directly output to the external circuit through the first housing and the second housing, thereby rendering the battery cell housing more integral. Further, in the present application, the first housing includes a bulge, the bulge is configured to be electrically connected to an external circuit, and the bulge is configured to extend in a direction approaching the second housing, so that there is a proper distance between the bulge and the second housing, thereby facilitating an electrical connection between the battery cell and the external circuit. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       To describe the technical solutions in some embodiments of this application more clearly, the following briefly describes the accompanying drawings required for describing some embodiments of this application. Apparently the accompanying drawings in the following description show merely some embodiments of this application, and a person of ordinary shill in the art may still derive other drawings from the accompanying drawings without creative efforts. 
         FIG.  1    is a schematic stereogram of a battery cell according to a first embodiment of the present application; 
         FIG.  2    is a schematic exploded view of a battery cell according to a first embodiment of the present application; 
         FIG.  3    is a schematic side view of a battery cell according to a first embodiment of the present application; 
         FIG.  4    is an enlarged partial schematic diagram of position A in  FIG.  3   ; 
         FIG.  5    is a schematic side view of a battery cell according to a second embodiment of the present application; 
         FIG.  6    is a schematic side view of a battery cell according to a third embodiment of the present application; 
         FIG.  7    is an enlarged partial schematic diagram of position B in  FIG.  6   ; 
         FIG.  8    is a schematic cross-sectional view of a battery cell according to a first embodiment of the present application; and 
         FIG.  9    is an enlarged partial schematic diagram of position C  FIG.  8   . 
     
    
    
     DETAILED DESCRIPTION 
     For ease of understanding of the present application, the following describes the present application in more detail with reference to the accompanying drawings and specific, embodiments. It should be noted that when an element is “fixed to” another element, the element may be directly on the another element, or there may be one or more elements between the elements. When an element is “connected to” another element, the element may be directly connected to the another element, or there may be one or more elements between the elements. Terms such as “vertical”, “horizontal”, “left”, “right”, and similar expressions used in this specification are for illustration only. 
     Unless otherwise defined, all technical and scientific terms used in this specification shall have the same meanings as those commonly understood by a person skilled in the art to which the present application pertains. The terms used in this specification of the present application are only used to describe specific embodiments, and are not intended to limit the present application. The term “and/or” used in this specification includes any and all combinations of one or more relevant listed items. 
     In a related art, in order to output a current from an inner electrode assembly, a hole needs to be provided in an outer housing of the battery cell, then a feedthrough is provided in the foregoing opening, and the feedthrough is insulated from the battery cell housing. A part, inside the accommodating cavity in the battery cell housing, of the feedthrough is electrically connected to the electrode assembly, and a part, outside the battery cell housing, of the feedthrough is configured to be electrically connected to an external circuit. Therefore, the battery cell housing in the foregoing structure is less integral. In addition, there is an excessively large distance between a positive electrode connecting terminal and a negative electrode connecting terminal that are provided on the battery cell housing and that are electrically connected to the exterior, and therefore, it is difficult to electrically connect the external circuit to the battery cell. 
     In view of this, referring to  FIG.  1    to  FIG.  9   , an embodiment provides a battery cell housing, where the battery cell housing defines an accommodating cavity for accommodating an electrode assembly  400 , and the battery cell housing includes a first housing  200  and a second housing  100 . The first housing  200  and the second housing  100  each define a part of the accommodating cavity. 
     The first housing  200  is configured to be electrically connected to a first tab  410  of the electrode assembly  400 . The second housing  100  is fixed to the first housing  200  in an insulated manner to define the accommodating cavity. The second housing  100  is configured to be electrically connected to a second tab  420  of the electrode assembly  400  and the second tab  420  is different from the first tab  410  in polarity. In other words, in this embodiment, the first housing  200  and the second housing  100  are charged separately with different polarities. When the first housing  200  is positively charged, the second housing  100  is negatively charged; or when the first housing  200  is negatively charged, the second housing  100  is positively charged. Specific polarities of the first housing  200  and the second housing  100  may be determined based on an actual need. In the battery cell housing provided in the present application, the first housing  200  is electrically connected to the first tab  410  and the second housing  100  is electrically connected to the second tab  420 . Therefore, to meet a need of an electric connection to the external circuit, there is no need to provide a hole in the battery cell housing, and a current in the battery cell housing can be directly output to the external circuit through the first housing  200  and the second housing  100 , thereby rendering the battery cell housing more integral. 
     The applicant has found that when the first housing  200  and the second housing  100  are configured to output the current, due to a difference in structural designs of the battery cell housing, the first housing and the second housing may not necessarily be at optimal relative positions and when relative positions of the first housing and the second housing are farther, it is even more difficult to electrically connect both the first housing and the second housing to the external circuit. To solve the foregoing problem, further, in this embodiment, the first housing  200  includes a bulge  210  configured to be electrically connected to the first tab  410 , at least part of the bulge  210  is exposed outside the accommodating cavity, and the bulge  210  is configured to extend in a direction approaching the second housing  100 . In this embodiment, the first housing  200  includes a bulge  210 , and the bulge  210  is configured to be electrically connected to an external circuit. The bulge  210  is configured to extend in a direction approaching the second housing  100 , that is, the existence of the bulge  210  shortens the distance between the first housing  200  and the second housing  100 , so that there is a proper distance between the bulge  210  and the second housing  100 , thereby facilitating electrical connections between both two electrodes of the battery cell  10  and the external circuit. 
     A shape and a position of the bulge  210  may be determined based on an actual need. Referring to  FIG.  5   , in an embodiment, the bulge  210  may be configured to define the accommodating cavity of the battery cell housing, that is, one surface wall of the bulge  210  faces toward the accommodating cavity, and another opposite surface wall faces away from the accommodating cavity. The surface wall facing away from the accommodating cavity is configured to be electrically connected to an external circuit. When the bulge  210  is configured to define the accommodating cavity of the battery cell housing, the first tab  410  may be directly or indirectly electrically connected to the bulge  210 . When the first tab  410  is directly electrically connected to the bulge  210 , the first tab  410  is directly connected to the surface wall, facing the accommodating cavity, of the bulge  210 . When the first tab  410  is indirectly electrically connected to the bulge  210 , the first tab  410  is electrically connected to another part of the first housing  200  to implement the electrical connection between the first tab and the bulge  210 . 
     In the foregoing embodiment, the bulge  210  is configured to define the accommodating cavity of the battery cell housing. Referring to  FIG.  1    to  FIG.  4   ,  FIG.  6    and  FIG.  7   , in another embodiment, the bulge  210  may be outside the accommodating cavity, that is, no surface wall of the bulge  210  faces the accommodating cavity of the battery cell housing. When the bulge  210  is outside the accommodating cavity, the bulge  210  is positioned more flexibly, so that it is more convenient to adjust relative positions of the bulge and the second housing  100 . Thus, the bulge can be electrically connected with the external circuit more conveniently. 
     To implement the electrical connection between the first housing  200  and the second housing  100 , in an embodiment, the battery cell housing further includes a first insulation portion  300 , and the first insulation portion  300  is connected to the first housing  200  and the second housing  100 . The first housing  200 , the second housing  100  and the first insulation portion  300  jointly define the accommodating cavity. In this solution, when the first insulation portion  300  is connected to the first housing  200  and the second housing  100  to implement the insulation between the first housing  200  and the second housing  100 , a better insulation effect is obtained. In addition, the insulation portion is configured to define the accommodating cavity, and therefore, the insulation portion does not occupy an excessively large extra space. 
     Specific structures of the first housing  200 , the second housing  100  and the first insulation portion  300  may be determined based on a specific need. Referring to  FIG.  1    and  FIG.  2   , in an embodiment, the first housing  200  includes an annular frame body  110  electrically connected to the first tab  410 , and the frame body  110  includes a first port. The first insulation portion  300  is annular and is connected to an outer peripheral edge, at the first port, of the frame body  110 . The second housing  100  further includes a first plate body  220 ; the first plate body  220  is connected to a side, farther away from the frame body  110 , of the first insulation portion  300  and covers the first port; and the bulge  210  is connected to the first plate body  220 . In this solution, the first housing  200  has the annular frame body  110 , and one side of the first housing is connected to a plate-shaped bulge  210 , so that the bulge  210  can extend in a circumferential direction, and the bulge  210  is positioned more flexibly. In particular, a connection mariner of the bulge  210  and the first plate body  220  may be determined based on a specific need. For example, the bulge  210  may be welded or integrated with the first plate body  220 . 
     In a further embodiment, the bulge  210  is outside the accommodating cavity and is connected to an edge of the first plate body  220 . In this embodiment, the bulge  210  is connected to an edge of the first plate body  220 , so that the bulge  210  can be closer to the second housing  100 , thereby facilitating extension of the bulge  210  toward the second housing  100 . In addition, in a specific embodiment, the bulge  210  can also be integrated with the first plate body  220 , which can facilitate processing of the bulge  210 . That is, the first plate body  220  and the bulge  210  can be processed at the same time through plate stamping at a lower cost. 
     In an embodiment, the bulge  210  is configured to extend in a direction approaching the frame body  110 . In this solution, the frame body  110  is closer to the bulge  210 , and the bulge  210  can extend toward the frame body  110  to shorten an extension distance of the bulge  210  and decrease a volume of the bulge  210 . In another embodiment, the bulge  210  may also extend toward the other parts of the second housing  100  other than the frame body  110 , so that the external circuit is electrically connected to both the bulge  210  and the other parts of the second housing  100  other than the frame body  110 . 
     When the bulge  210  extends in a direction approaching the frame body  110 , the external circuit is electrically connected to both the bulge  210  and the frame body  110 . Referring to  FIG.  3    and  FIG.  4   , in an embodiment, the bulge  210  is spaced apart from an outer wall face of the frame body  110 . In this solution, the bulge  210  is spaced apart from the frame body  110 , to implement insulation between the bulge and the frame body through a simple structure at a low cost. Retelling to  FIG.  6    and  FIG.  7   , in another embodiment, a second insulation portion is provided between the bulge  210  and the frame body  110 , a side face of the second insulation portion is connected to the outer wall face of the frame body  110 , and another side face of the second insulation portion is connected to the bulge  210 . In this solution, the bulge  210  is fixed to the frame body  110  through the second insulation portion, so that the bulge  210  is arranged in a more stable structure. 
     Referring to  FIG.  8    and  FIG.  9   , in an embodiment, the first insulation portion  300  sequentially includes a first material layer  310 , a second material layer  320  and a third material layer  330  in a direction from the first plate body  220  to the frame body  110 . The second material layer  320  is made of an insulation material, specifically, a ceramic material. The first material layer  310  and the first plate body  220  each are made of a metal material. The metal material may specifically include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, stainless steel and a composition (alloy) thereof. The third material layer  330  and the frame body  110  each are made of a metal material. The metal material may specifically include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Ge, Sb, Pb, In, Zn, stainless steel and a composition (alloy) thereof. In this solution, since the first material layer  310  and the first plate body  220  each are made of a metal material, the first plate body  220  and the first material layer  310  are connected more reliably. Since the third material layer  330  and the frame body  110  each are made of a metal material, the third material layer  330  and the frame body  110  are connected more reliably. 
     To facilitate the connection between the frame body  110  and the first insulation portion  300 , referring to  FIG.  9   , in an embodiment, a connecting flange  112  is provided at the outer peripheral edge, at the first port, of the frame body  110 ; the connecting flange  112  extends into the accommodating cavity; and the first insulation portion  300  is connected to a wall face, facing the first plate body  220 , of the connecting flange  112 . With a structure of the connecting flange  112 , a connection area of the first insulation portion  300  and the frame body  110  is larger, and the first insulation portion and the frame body can be more stably connected. 
     In a further embodiment, the second housing  100  further includes a second plate body  120 , the frame body  110  includes a second port opposite the first port, and the second plate body  120  is connected to the frame body  110  and covers the second port. In this solution, the first housing  200 , the second housing  100  and the first insulation portion  300  may basically define the accommodating cavity, which requires fewer parts for the entire battery cell housing, thereby lowering costs for materials. 
     To improve structural strength of the battery cell housing and energy density of the battery cell  10  having the battery cell housing, in an embodiment, a maximum thickness of the frame body  110  is greater than that of the first plate body  220  and the second plate body  120 , and the maximum thickness L 1  of the frame body  110 , the maximum thickness L 2  of the first plate body  220  and the maximum thickness L 3  of the second plate body  120  satisfy that 0.01 mm≤L 1 −L 2 ≤0.5 mm, and 0.01 mm≤L 1 −L 3 ≤0.5 mm. For example, L 1 −L 2  may be specifically equal to 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm. L 1 −L 3  may be specifically equal to 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm. In this solution, with a greater maximum thickness of the frame body  110 , the structural strength of the housing of the battery cell  10  can be ensured, and with smaller maximum thicknesses of the first plate body  220  and the second plate body  120 , the battery cell housing may occupy a smaller space and the electrode assembly  400  in the battery cell housing may have a larger volume, thereby further increasing the energy density of the battery cell  10  with the battery cell housing in the present application. That is, in the foregoing solution, the structural strength of the battery cell housing can be ensured, and the energy density of the battery cell  10  with the battery cell housing can also be improved. 
     Specifically, the maximum thickness L 1  of the frame body  110  satisfies that 0.1 mm≤L 1 ≤1 mm. For example, L 1  may be specifically equal to 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm or 1 mm. The maximum thickness L 2  of the first plate body  220  satisfies that 0.03 mm≤L 2 ≤0.6 mm. For example, L 2  may be specifically 0.03 mm, 0.08 mm, 0.15 mm, 0.3 mm, 0.45 mm or 0.6 mm. The maximum thickness L 3  of the second plate body  120  satisfies that 0.03 mm≤L 3 ≤0.6 mm. For example, L 3  may be specifically 0.03 mm, 0.08 mm, 0.15 mm, 0.3 mm, 0.45 mm or 0.6 mm. In this solution, when the maximum thickness L 1  of the frame body  110  is within the foregoing size range, the frame body  110  can have proper structural strength without occupying an excessively large space of the electrode assembly  400 . When the maximum thickness L 2  of the first plate body  220  is within the foregoing size range, the first plate body may occupy a smaller space while ensuring a basic protection effect. When the maximum thickness L 3  of the second plate body  120  is within the foregoing size range, the second plate body may occupy a smaller space while ensuring a basic protection effect. 
     The frame body  110 , the first plate body  220  and the second plate body  120  may be made of specific materials determined according to an actual need. Specifically, the frame body  110  may be made of a carbon material, a metal material or a polymer material. The first plate body  220  may be made of a carbon material, a metal material or a polymer material. The second plate body  120  is made of a carbon material, a metal material or a polymer material. In this solution, the frame body  110 , the first plate body  220  and the second plate body  120  can facilitate wire connection, and can also have sufficient structural strength. 
     In the materials mentioned in the present application, the carbon material includes at least one of carbon felt, a carbon film, carbon black, acetylene black, fullerene, a conductive graphite film, or a graphene film. The polymer material includes at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene glycol, polyamide-imide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, acid anhydride modified polypropylene, polyethylene, other ethylene and copolymer (EVA, EEA, EAA, and EVAL), polyvinyl chloride, polystyrene, other types of polyolefins, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone, amorphous α-olefin copolymer, or a derivative thereof. The metal material may include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, stainless steel and a composition (alloy) thereof. 
     In a further embodiment, the frame body  110  is provided with a liquid injection hole  111 . In this solution, the liquid injection hole  111  is provided in a relatively thicker frame body  110 , which can facilitate opening and sealing of the liquid injection hole  111 . 
     In a further embodiment, the first plate body  220  or the second plate body  120  is provided with an explosion-proof valve. In this solution, the explosion-proof valve is arranged on the relatively thinner first plate body  220  or second plate body  120 , which can reduce processing difficulty of the explosion-proof valve and also improve protection performance of the explosion-proof valve. 
     A second aspect of the present application also provides a battery cell  10 , where the battery cell  10  includes the battery cell housing and the electrode assembly  400  according to any one of the foregoing embodiments. The battery cell housing defines an accommodating cavity, and the electrode assembly  400  is provided in the accommodating cavity. 
     A third aspect of the present application further provides a battery, where the battery includes the battery cell  10  in the foregoing embodiments. Specifically, the battery may include one or more battery cells  10 , and when the battery includes a plurality of battery cells  10 , the battery cells  10  may be mutually connected in series or in parallel. 
     A fourth aspect of the present application further provides an electric device, where the electric device includes the battery in the foregoing embodiments. Specifically, the electric device may be a mobile device such as a mobile phone, a tablet computer, or a notebook computer. The electric device may also be a transportation tool such as an electric vehicle and an electric motorcycle. 
     It should be noted that, although this specification and the accompanying drawings of the present application provide preferable embodiments of the present application, the present application can be implemented in many different forms, and is not limited to some embodiments described in this specification. These embodiments should not be construed as additional limitations on the content of the present application, and these embodiments are provided for ease of a more thorough and comprehensive understanding of the disclosed content of the present application. In addition, the foregoing technical features are further mutually combined to form various embodiments not listed above, and some embodiments are all construed as falling within the scope recorded in this specification of the present application; and further, a person of ordinary skill in the art can make improvements or changes based on the foregoing descriptions, and all these improvements and changes shall fall within the protection scope of the appended claims of the present application.