Housings, batteries, and electronic devices

Abstract

A housing, a battery, and an electronic device. A housing (10) that accommodates an electrode body includes a peripheral wall (11) and a first cover plate (131), a first opening (111) is provided in the peripheral wall (11), a remainder (1311) is provided around the first cover plate (131), the remainder (1311) is melted to form a molten edge portion, and the first cover plate (131) is joined to the peripheral wall (11) by the molten edge portion (1313) to close the first opening (111).

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of a Chinese patent application with application number 202121403374.X and application title "Housing and Battery", which was filed with the China National Intellectual Property Administration on June 23, 2021, and all of its contents are incorporated herein by reference.

[0002] This application relates to the field of batteries, and specifically, to a housing, a battery having the housing, and an electronic device having the battery.

Background Art

[0003] In the prior art, a battery is closed by welding using a flange, and the flange occupies an assembly space and reduces the energy density of the battery.

[0004] For example, in the invention with publication number "201711165151.2", a packaging housing and a battery of a metal - housing battery are disclosed. The packaging housing includes a first housing and a second housing. The first housing includes a top and a first side wall. The first side wall extends downward from the top and has a first flange that extends outward and surrounds an opening. The second housing includes an intermediate part and a second flange. The second flange extends outward from the intermediate part, and the intermediate part covers the opening. The materials of the first housing and the second housing are alloys. The cell is accommodated in the packaging housing, and the first flange and the second flange are welded and closed.

[0005] Such a form of packaging housing is welded by the first flange and the second flange of the housing. To ensure the effectiveness of the welded seal, the flange of the housing occupies an assembly space, reduces the effective volume of the battery, and decreases the battery capacity.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The purpose of this application is to solve the technical problem in the prior art in which the flange occupies the assembly space of the battery. [Means for solving the problem]

[0007] In one embodiment, the housing for housing an electrode body according to the present invention includes a peripheral wall and a first cover plate, wherein a first opening is provided in the peripheral wall, a remainder is provided around the first cover plate, the remainder is melted to form a molten edge, and the first cover plate is joined to the peripheral wall by the molten edge to close the first opening.

[0008] In one embodiment, the material of the peripheral wall is stainless steel.

[0009] In one embodiment, the thickness of the peripheral wall is 30 to 150 μm.

[0010] In one embodiment, the material of the first lid plate is stainless steel.

[0011] In one embodiment, the remainder is the portion of the first cover plate that protrudes from the outer surface of the peripheral wall along the circumferential direction of the peripheral wall when the first cover plate covers the first opening.

[0012] In one embodiment, the remaining portion has a height of 50 μm to 300 μm that protrudes from the peripheral wall along the circumferential direction of the peripheral wall.

[0013] In one embodiment, the thickness of the remaining portion is 30 to 300 μm.

[0014] In one embodiment, a boss is provided on the first cover plate.

[0015] In one embodiment, the circumferential dimensions of the boss are matched to the circumferential dimensions of the first opening, and when the first cover plate is assembled to the circumferential wall, the periphery of the boss abuts against the circumferential wall.

[0016] In one embodiment, the first cover plate includes a first plate body and a second plate body, the remainder of which is installed on the first plate body, and the second plate body is welded to the first plate body to form the boss.

[0017] In one embodiment, the thickness of the first plate is 30 to 200 μm.

[0018] In one embodiment, the thickness of the second plate is 100 to 500 μm.

[0019] In one embodiment, the housing includes a second cover plate, the peripheral wall of which a second opening is formed opposite to the first opening, and the second cover plate covers the second opening.

[0020] In one embodiment, a welded joint is provided in the peripheral wall that extends to the first opening and the second opening.

[0021] In one embodiment, the peripheral wall is substantially rectangular in shape and includes two first side plates and two second side plates that are installed opposite each other, and the area of ​​the first opening and the second opening is smaller than the area of ​​the first side plate and the second side plate.

[0022] In one embodiment, a welded joint is provided in the peripheral wall, extending to the first opening and the second opening, the area of ​​the first side plate is smaller than the area of ​​the second side plate, and the welded joint is provided in the first side plate.

[0023] In one embodiment, the relationship between the height H1 of the remaining portion, the height H2 of the excess material at the molten edge, the width W of the molten edge, and the thickness T2 of the remaining portion is H1 = (π × (H2 + W / 2)² - W2) / 4T².

[0024] In another embodiment, the battery according to the present invention includes the housing and an electrode body, the electrode body being housed within the housing, and the first cover plate being joined to the peripheral wall by the molten edge to close the first opening.

[0025] In one embodiment, the molten edge portion protrudes along the circumferential direction of the peripheral wall.

[0026] In one embodiment, the molten edge portion has a surplus height protruding along the circumferential direction of the peripheral wall that is less than 200 μm.

[0027] In one embodiment, the molten edge portion is at least partially attached to the outer surface of the peripheral wall.

[0028] In one embodiment, the end portion of the peripheral wall facing the first cover plate is located between the molten edge portion and the boss.

[0029] In yet another aspect, the electronic device according to the present application includes the battery described above.

Advantages of the Invention

[0030] As described above, the present application provides a housing and a battery. The housing includes a peripheral wall and a first cover plate. A first opening is provided in the peripheral wall, and a remaining portion with a predetermined dimension is provided as needed around the first cover plate. When the first cover plate and the peripheral wall are closed, the remaining portion is melted to form a molten edge portion with the required dimension. In the battery, the first cover plate is joined to the peripheral wall by the molten edge portion to close the first opening, realizing the sealing between the first cover plate and the peripheral wall, and improving the energy density of the entire battery without occupying too much space due to the molten edge portion being too large.

Brief Description of the Drawings

[0031] The above and / or additional aspects and advantages of the present application will become clear and easier to understand by describing the embodiments with reference to the following drawings. [Figure 1] It is a perspective view of a housing according to an embodiment of the present application. [Figure 2] It is a schematic assembly view of the housing shown in FIG. 1. [Figure 3] It is a partial enlarged view of part A in FIG. 2. [Figure 4] It is a schematic sealing view of the housing shown in FIG. 1. [Figure 5] This is a magnified view of section B in Figure 4. [Figure 6] This is a perspective view of a battery according to one embodiment of the present invention. [Figure 7] Figure 1 is a top view of the first cover plate of the housing. [Figure 8] Figure 7 is a side view of the first cover plate. [Figure 9] This is a perspective view of a housing according to another embodiment of the present application. [Modes for carrying out the invention]

[0032] The embodiments of the present application will be described in detail below, and examples of the above embodiments are shown in the drawings. Throughout, the same or similar reference numerals indicate the same or similar elements, or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative only and are for interpreting the present application, and should not be understood as limiting the present application.

[0033] Furthermore, in the description of this application, the directions or positional relationships indicated by terms such as "up" and "down" are based on the directions or positional relationships shown in the drawings and are merely for the purpose of easily explaining and simplifying the description of this application. They do not indicate or suggest that the shown device or element has a specific direction, or that it must be composed of and operated in a specific direction, and therefore should not be understood as limiting this application.

[0034] Before describing the embodiments in detail, it should be understood that this application is not limited to the detailed structures or element arrangements described later in this application or in the drawings. This application may also include embodiments realized in other ways. It should be understood that the phrases and terms used herein are for illustrative purposes only and not to be constrained. Similar phrases used herein, such as “includes,” “contains,” and “has,” mean to include the items listed thereafter, their equivalents, and other additional items. In particular, when describing “a certain element,” this application does not limit the number of such elements to one, but may include multiple elements.

[0035] This application provides a housing 10 and a battery 20 having the housing 10.

[0036] As shown in Figure 1, the housing 10 for housing the electrode body according to the present invention includes a peripheral wall 11 and a first cover plate 131, wherein a first opening 111 is provided in the peripheral wall 11 and the first cover plate 131 covers the first opening 111.

[0037] As shown in Figures 2 and 3, the remaining portion 1311 is installed around the first cover plate 131, and the remaining portion 1311 is installed according to the dimensions of the peripheral wall 11 (thickness T1 of the peripheral wall 11, dimensions of the first opening 111). The remaining portion 1311 is the part of the first cover plate 131 that protrudes from the peripheral wall 11 along the circumferential direction of the peripheral wall 11 when the first opening 111 is covered by the first cover plate 131. As can be understood, the "part of the first cover plate 131 that protrudes from the peripheral wall 11 along the circumferential direction of the peripheral wall 11" is the part that protrudes from the outer surface of the peripheral wall 11 of the first cover plate 131, and as shown in Figure 3, the height of the remaining portion 1311 is H1.

[0038] As shown in Figures 4 and 5, the remaining portion 1311 is melted to form a molten edge 1313, and the first cover plate 131 is joined to the peripheral wall 11 by the molten edge 1313. The remaining portion 1311 is installed around the first cover plate 131 to form a molten edge 1313 that goes all the way around the first cover plate 131, covering the connection gap between the first cover plate 131 and the peripheral wall 11, and the periphery of the first cover plate 131 is joined to the peripheral wall 11 by the molten edge 1313 to close the first opening 111.

[0039] If necessary, when manufacturing the first cover plate 131, some material is left as a residue 1311, and the residue 1311 is melted by a method such as laser welding to form a molten edge 1313, thereby achieving a sealed connection between the first cover plate 131 and the peripheral wall 11. The molten edge 1313 has a slight excess height H2 relative to the outer surface of the peripheral wall 11. Compared to the conventional technique of closing with a flange, the solution of the present invention ensures a seal between the first cover plate 131 and the peripheral wall 11, while reducing the assembly space occupied by the sealed structure and effectively improving the energy density of the battery. By setting the residue 1311 such that the circumferential dimensions of the first cover plate 131 are larger than the circumferential dimensions of the peripheral wall 11, assembly between the first cover plate 131 and the peripheral wall 11 is facilitated, preventing the first cover plate 131 from falling into the peripheral wall 11 when it is positioned against the peripheral wall 11, reducing the difficulty of the process and improving the yield.

[0040] Furthermore, the material of the peripheral wall 11 is stainless steel, which has higher strength compared to materials used as battery housings such as aluminum, and is suitable for making the peripheral wall 11 thinner. Preferably, the peripheral wall 11 is 316L type stainless steel. In one embodiment, the thickness T1 of the peripheral wall 11 is 30 to 150 μm, which ensures the strength requirements of the housing 10 and, because it occupies less space, the housing 10 can accommodate electrode bodies with a larger volume and improve the capacity of the formed battery.

[0041] In one embodiment, the remaining portion 1311 has a height H1 of 50 μm to 300 μm that protrudes from the peripheral wall 11 along the circumferential direction of the peripheral wall 11.

[0042] The dimensional tolerance of the first opening 111 is approximately ±50 μm, and the remainder 1311 is limited to protruding at least 50 μm from the peripheral wall 11 along the circumferential direction of the peripheral wall 11. This prevents the first cover plate 131 from falling into the peripheral wall 11 when it is positioned on the peripheral wall 11, and facilitates welding and sealing between the first cover plate 131 and the peripheral wall 11.

[0043] If the remaining portion 1311 protrudes more than 300 μm from the peripheral wall 11 along the circumferential direction, its dimensions become too large. First, it is difficult to completely melt the remaining portion 1311 with laser light, increasing the difficulty of processing, and the excess height of the formed molten edge 1313 becomes too large, occupying a large space. Furthermore, increasing the laser energy is necessary to melt the remaining portion 1311, and for the thin peripheral wall 11, there is a risk of thermal deformation of the peripheral wall 11 due to excessively high laser energy, which can ultimately lead to damage.

[0044] In one embodiment, the material of the first cover plate 131 is stainless steel, which has higher strength and is suitable for making the first cover plate 131 thinner and reducing the space it occupies. Preferably, the first cover plate 131 is made of 316L type stainless steel. If both the first cover plate 131 and the peripheral wall 11 are made of stainless steel, the welding effect between the two can be improved.

[0045] As shown in Figure 6, unlike the peripheral wall 11, the first cover plate 131 needs to have structures such as poles 1315 and liquid injection holes 1317 formed on it. By installing bosses 1319 on the first cover plate 131 and partially thickening it, the structural strength of the first cover plate 131 at corresponding locations is improved, for example, at the locations corresponding to poles 1315 and liquid injection holes 1317. This effectively prevents deformation of the first cover plate 131 during drilling and improves product quality.

[0046] Furthermore, the boss 1319 fits into the first opening 111, meaning that the shape of the boss 1319 and the shape of the first opening 111 are similar, and the circumferential dimensions of the boss 1319 match the circumferential dimensions of the first opening 111. Therefore, when assembling the first cover plate 131 to the peripheral wall 11, the boss 1319 acts as a guide, and the periphery of the boss 1319 abuts against the peripheral wall 11, guiding and positioning the assembly of the first cover plate 131 and aiding in the welding of the first cover plate 131 to the peripheral wall 11. As can be understood, "the circumferential dimensions of the boss 1319 match the circumferential dimensions of the first opening 111" means that the circumferential dimensions of the boss 1319 are slightly larger than, equal to, or slightly smaller than the circumferential dimensions of the first opening 111. For example, in the embodiments shown in Figures 1 to 3, if the first opening 111 is rectangular, then the boss 1319 is also rectangular, and the length and width of the boss 1319 are ±20 μm of the length and width of the first opening 111. That is, the sliding connection or interference fit of the boss 1319 and the circumferential wall 11 can guide and position the assembly of the first cover plate 131. In this application, the ratio of the circumferential dimensions of the boss 1319 to the circumferential dimensions of the first opening 111 is not limited, and it is sufficient that the first cover plate 131 is guided or positioned by the boss 1319.

[0047] In this embodiment, a boss 1319 is installed in the middle of the first cover plate 131, which is similar in shape to the first opening 111 and has slightly larger circumferential dimensions. The boss 1319 is integrally connected to the remainder 1311 by a connecting portion (not shown). As a result, a continuous stepped structure is formed along the circumferential direction at the edge of the first cover plate 131. As shown in Figure 2, when the first cover plate 131 is assembled to the circumferential wall 11, the boss 1319 is located inside the circumferential wall 11, the periphery of the boss 1319 (i.e., the side perpendicular to the connecting portion) abuts against the inner surface of the circumferential wall 11, the connecting portion abuts against the top annular surface of the circumferential wall 11, and the remainder 1311 protrudes from the outer surface of the circumferential wall 11. The first cover plate 131 is tightly connected to the circumferential wall 11, thereby improving the quality of subsequent welding between the first cover plate 131 and the circumferential wall 11.

[0048] If the first cover plate 131 is made of a hard material such as stainless steel, the process of processing it to form the above-mentioned staircase structure becomes difficult, and especially when the thickness is small, it is difficult to process a right-angle structure that meets the requirements. As shown in Figures 7 and 8, the first cover plate 131 includes a first plate body 13121 and a second plate body 13122, the remainder 1311 is installed on the first plate body 13121, the first plate body 13121 has a larger circumferential dimension compared to the second plate body 13122, and the second plate body 13122 is welded to the first plate body 13121 to form the boss 1319. By welding the second plate 13122 to the middle of the first plate 13121, the difficulty of the process of forming a continuous staircase structure along the circumferential direction at the edge of the first cover plate 131 is reduced, effectively lowering manufacturing costs, resulting in a high-quality staircase structure formed by welding two layers of plates, and improving the assembly effect between the first cover plate 131 and the periphery wall 11.

[0049] As can be understood, the fact that the material of the first cover plate 131 is stainless steel is merely a specific embodiment of the present invention. In other embodiments, the two may be made of different materials. For example, the material of the first plate 13121 may be high-strength stainless steel and the material of the second plate 13122 may be nickel, or the material of the first plate 13121 may be stainless steel and the material of the second plate 13122 may be aluminum. By welding the two together with nickel, the amount of nickel and steel used can be reduced, thereby lowering costs. The present invention does not limit the materials of the first plate 13121 and the second plate 13122; the two layers of plates may be welded together to form a stepped structure.

[0050] Furthermore, the thickness of the first plate 13121 is 30 to 200 μm, which allows for sealing with a thin thickness and reduces the occupied space. The thickness of the second plate 13122 is 100 to 500 μm, preferably 200 to 300 μm, and the larger boss 1319 can improve the guiding and positioning effects, facilitate assembly and positioning, and improve strength.

[0051] In this embodiment, the thickness T2 of the remaining portion 1311 is 30 μm to 300 μm. If a boss 1319 is installed on the first cover plate 131, and the boss 1319 improves the strength of the first cover plate 131, and the remaining portion 1311 only serves the function of assembly and later forming the molten edge portion 1313 to seal, it can be made thinner. For example, the thickness T2 of the remaining portion 1311 is 30 μm, which occupies less space while ensuring the required strength. If the first cover plate 131 is a single plate, the overall thickness is the same, and in order to ensure strength, the entire plate needs to be thicker, and the remaining portion 1311 has a correspondingly larger thickness. For example, the thickness T2 of the remaining portion 1311 is 300 μm, which can ensure the strength of the first cover plate 131, reduce the number of processes, lower the difficulty of processing, and improve manufacturing efficiency.

[0052] As shown in Figure 9, the housing 10 includes a second cover plate 132, and the circumferential wall 11 has a second opening 112 opposite to the first opening 111, that is, the first opening 111 and the second opening 112 are formed at both ends of the circumferential wall 11, respectively, along the axial direction of the circumferential wall 11, and the second cover plate 132 covers the second opening 112. As can be understood, the sealing method and structure of the second cover plate 132 and the circumferential wall 11 may be similar to that of the first cover plate 131, and will not be described here.

[0053] To improve the energy density of the battery, it is necessary to reduce the thickness T1 of the peripheral wall 11. In the conventional deep drawing method, cracks and wrinkles tend to occur when thinning the steel housing. In this embodiment, the entire steel sheet is stretched to 30 μm to 150 μm, and the 30 to 150 μm steel sheet is folded into a cylindrical body and welded to form the peripheral wall 11. Specifically, the peripheral wall 11 has welded joints 115 that extend to the first opening 111 and the second opening 112, and the formed peripheral wall 11 realizes a thin housing that is difficult to achieve with conventional deep drawing processes.

[0054] Furthermore, the peripheral wall 11 has a substantially rectangular parallelepiped shape and includes two first side plates 1171 and two second side plates 1172 installed opposite each other, the first side plates 1171 and the second side plates 1172 are connected by a curve, and the two first side plates 1171 and the two second side plates 1172 surround each other to form a first opening 111 and a second opening 112 formed at both axial ends of the peripheral wall 11. The first opening 111 and the second opening 112 are rectangular, and the areas of the first opening 111 and the second opening 112 are smaller than the areas of the first side plate 1171 and the second side plate 1172. In other words, the first opening 111 and the second opening 112 are formed on the smallest side surfaces of the rectangular parallelepiped formed by the peripheral wall 11, thereby reducing the influence of the first cover plate 131 and the second cover plate 132 on the overall energy density of the battery.

[0055] Preferably, the area of ​​the first side plate 1171 is smaller than the area of ​​the second side plate 1172, and the welded seam 115 is installed on the first side plate 1171 to reduce the influence of the excess height of the welded seam 115 on the thickness direction of the cell. As can be understood, this is merely a preferred embodiment of the present application, and in other embodiments, the welded seam 115 may be installed on the second side plate 1172, or at the connection point between the first side plate 1171 and the second side plate 1172, or the welded seam 115 may be installed in the peripheral wall 11 extending to the first opening 111 and the second opening 112, and the present application does not limit the specific installation location of the welded seam 115.

[0056] As shown in Figure 6, the battery 20 according to the present invention includes a housing 10 and an electrode body (not shown), the electrode body being housed within the housing 10, and the first cover plate 131 is joined to the peripheral wall 11 by a molten edge portion 1313 to close the first opening 111.

[0057] The molten edge portion 1313 protrudes along the circumferential direction of the peripheral wall 11.

[0058] As shown in Figures 3 and 5, the cross-section of the molten edge 1313 is similar to a fan shape, and the material properties of the housing 10 and the pressure difference between the inside and outside of the battery 20 provide the excess height H2 and width W of the molten edge 1313 that satisfy the sealing requirements. In this embodiment, the excess height H2 of the molten edge 1313 protruding along the circumferential direction of the peripheral wall 11 is less than 200 μm, ensuring a sealed connection between the first cover plate 131 and the peripheral wall 11, and occupying only a small space, thereby improving the energy density of the battery 20.

[0059] Based on the fact that the cross-sectional area of ​​the remaining portion 1311 before melting is approximately equal to the cross-sectional area of ​​the molten edge portion 1313 after melting, the relationship between the height H1 of the remaining portion 1311, the excess height H2 of the molten edge portion 1313, the width W of the molten edge portion 1313, and the thickness T2 of the remaining portion 1311 is established as H1 = (π × (H2 + W / 2)² - W2) / 4T².

[0060] This allows the height H1 of the remaining portion 1311 to be designed based on the required excess height H2 of the molten edge 1313, the width W of the molten edge 1313, and the thickness T2 of the remaining portion 1311.

[0061] In one embodiment, the molten edge 1313 is formed by melting the remaining portion 1311 of the first cover plate 131, that is, the molten edge 1313 and the first cover plate 131 are integrally connected, the molten edge 1313 is at least partially attached to the outer surface of the peripheral wall 11, there is no need to melt at the connection point between the peripheral wall 11 and the first cover plate 131, there is a connection interface between the molten edge 1313 and the peripheral wall 11, and the molten edge 1313 connecting the first cover plate 131 and the peripheral wall 11 is formed by melting only the remaining portion 1311 of the first cover plate 131.

[0062] As shown in Figure 4, the end of the peripheral wall 11 toward the first cover plate 131 is located between the molten edge 1313 and the boss 1319, eliminating the need to melt the peripheral wall 11. The peripheral wall 11 is held between the molten edge 1313 and the boss 1319. In addition to the adhesion between the molten edge 1313 and the outer surface of the peripheral wall 11, the peripheral wall 11 is held between the molten edge 1313 and the boss 1319, thereby improving the connection strength between the first cover plate 131 and the peripheral wall 11 and further ensuring the quality of the seal between them.

[0063] Based on the above, the present invention provides a housing and a battery, the housing comprising a peripheral wall and a first cover plate, the peripheral wall having a first opening, the periphery of the first cover plate having a predetermined remainder of a certain dimension as needed, and when the first cover plate and the peripheral wall are sealed, the remainder is melted to form a molten edge of the required dimension, and in the battery, the first cover plate is joined to the peripheral wall by the molten edge to close the first opening, achieving closure between the first cover plate and the peripheral wall, and improving the overall energy density of the battery without the molten edge occupying an excessively large space.

[0064] Furthermore, this application provides an electronic device including the aforementioned battery.

[0065] The concepts described herein can be implemented in other forms without departing from their spirit and characteristics. The specific embodiments disclosed are illustrative and not limiting. Therefore, the scope of this application is determined more by the appended claims than by the foregoing description. Any changes to the literal meaning of the claims and equivalent scope should fall within the scope of these claims.

[0066] In this specification, any reference to terms such as “one embodiment,” “several embodiments,” “example,” “specific example,” or “several examples” means that the specific features, structures, materials, or properties described in combination with such embodiment or example are included in at least one embodiment or example of this application. Exemplary descriptions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described may be appropriately combined in any one or more embodiments or examples.

[0067] Although embodiments of the present application have been shown and described above, it should be understood that these embodiments are illustrative and should not be understood as limiting the present application. Those skilled in the art can modify, alter, replace, and change the embodiments within the scope of the present application without departing from the principles and objectives of the present application. [Explanation of Symbols]

[0068] 10 Housing 11 Surrounding wall 111 First opening 112 Second opening 115 Welded joints 1171 First side panel 1172 Second side panel 131 First cover plate 1311 remainder 13121 First plate 13122 Second plate 1313 Molten edge 1315 Paul 1317 Liquid injection hole 1319 Boss 132 Second cover plate 20 batteries T1 Peripheral wall thickness T2 Remaining thickness H1 Remaining height H2 Refill height at the molten edge W Width of the molten edge

Claims

1. A housing for accommodating an electrode body, The housing includes a peripheral wall and a first cover plate, the peripheral wall defining a first opening, the remainder positioned around the first cover plate, the remainder being melted to form a molten edge, and the first cover plate being joined to the peripheral wall by the molten edge to close the first opening. The material of the peripheral wall and the first cover plate is stainless steel. The thickness of the peripheral wall is 30 to 150 μm. The remaining portion of the housing is characterized in that it protrudes from the peripheral wall along the circumferential direction of the peripheral wall to a height of 50 μm to 300 μm.

2. The housing according to claim 1, characterized in that the remaining portion is a portion that protrudes from the outer surface of the peripheral wall along the circumferential direction of the peripheral wall of the first cover plate when the first opening is covered by the first cover plate.

3. The housing according to claim 1, characterized in that a boss is provided on the first cover plate, the circumferential dimension of the boss is the same as the circumferential dimension of the first opening, and when the first cover plate is assembled to the circumferential wall, the periphery of the boss abuts against the circumferential wall.

4. The housing according to claim 3, wherein the first cover plate includes a first plate body and a second plate body, the remainder of which is installed on the first plate body, and the second plate body is welded to the first plate body to form the boss.

5. The housing according to claim 4, characterized in that the thickness of the remaining portion is 30 μm to 200 μm, the thickness of the first plate is 30 to 200 μm, and the thickness of the second plate is 100 to 500 μm.

6. The housing according to claim 1, wherein the housing includes a second cover plate, the peripheral wall of which a second opening is formed opposite to the first opening, and the second cover plate covers the second opening.

7. The housing according to claim 6, characterized in that the peripheral wall is substantially rectangular in shape, and the peripheral wall includes two first side plates and two second side plates installed opposite each other, and the area of ​​the first opening and the second opening is smaller than the area of ​​the first side plate and the second side plate.

8. The housing according to claim 7, characterized in that a welded joint extending to the first opening and the second opening is arranged in the peripheral wall, the area of ​​the first side plate is smaller than the area of ​​the second side plate, and the welded joint is installed on the first side plate.

9. A battery comprising a housing according to any one of claims 1 to 8, and an electrode body, wherein the electrode body is housed within the housing, and the first cover plate is joined to the peripheral wall by the molten edge to close the first opening.

10. The battery according to claim 9, characterized in that the molten edge portion has a height of excess material protruding along the circumferential direction of the peripheral wall that is less than 200 μm.

11. An electronic device characterized by including the battery described in claim 9.

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