Housing assembly, secondary battery and electric device

Abstract

The invention relates to the technical field of energy storage, in particular to a shell assembly, a secondary battery and an electric device. The shell assembly comprises a shell body, a connecting piece, a first pole and an insulating part. The shell body is provided with a containing cavity, and a first hole is formed in the surface of one side of the shell body. The connecting piece is arranged on the side face, away from the containing cavity, of the shell body and provided with a second hole, the projection of the first hole is located in the projection of the second hole in the first direction, and the second hole communicates with the first hole. The first pole comprises an extending part and a connecting part which are connected with each other, the extending part is located on the side, facing the containing cavity, of the connecting part in the second direction, the connecting part surrounds the peripheral face of the extending part, the extending part penetrates through the first hole and the second hole in the first direction to extend into the containing cavity, the connecting part is located outside the containing cavity, and a gap is formed between the connecting part and the connecting piece; the second direction is perpendicular to the first direction. The gap between the connecting part and the connecting sheet is filled and sealed by the insulating part, and the assembling gap between the connecting part and the connecting sheet is eliminated, so that the sealing performance of the insulating part is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a housing assembly, a secondary battery and an electrical device. Background Art

[0002] Battery poles are a key component in batteries and mainly serve as connections. They convert the chemical energy inside the battery into electrical energy, thereby providing power to the external circuit. The positive pole is connected to the positive electrode of the battery, while the negative pole is connected to the negative electrode of the battery. The two cannot touch each other to avoid short circuit. Summary of the invention

[0003] The inventor has found through research that the pole of a hard shell thin cell has an unstable position and is prone to tilt, resulting in poor sealing effect. In view of this, the present application provides a shell assembly, a secondary battery and an electrical device, which can improve the sealing effect of the pole.

[0004] In a first aspect, an embodiment of the present application provides a shell assembly, including a shell body, a connecting piece, a first pole and an insulating member. The shell body has a cavity, and a first hole is provided on one side surface of the shell body, and the central axis of the first hole is parallel to the first direction. The connecting piece is arranged on the side of the shell body away from the cavity, and the connecting piece is provided with a second hole. Along the first direction, the projection of the first hole is located within the projection of the second hole, and the second hole is connected to the first hole. The first pole includes a connected insertion portion and a connecting portion, along the second direction, the insertion portion is located on the side of the connecting portion facing the cavity, the connecting portion surrounds the outer peripheral surface of the insertion portion, the insertion portion passes through the first hole and the second hole along the first direction to extend to the cavity, the connecting portion is located outside the cavity, there is a gap between the connecting portion and the connecting piece, and the second direction is perpendicular to the first direction. The insulating member fills and seals the gap, and the material of the insulating member is glass.

[0005] The protruding portion is located on the side of the connecting portion facing the cavity, and extends to the cavity through the first hole and the second hole along the first direction. Compared with the related art, a prefabricated insulating member is used to be arranged between the protruding portion and the wall surface of the annular groove. In order to ensure the assembly tolerance, the prefabricated insulating member and the protruding portion and the wall surface need to retain the assembly tolerance. The insulating member often deforms under pressure to achieve the sealing effect. The technical solution uses glass to fill and seal the gap between the connecting portion and the connecting piece, eliminates the assembly gap between the connecting portion and the connecting piece, and thus improves the sealing performance of the insulating member.

[0006] In the above embodiments, a third hole is provided on a surface of the extending portion away from the cavity, and along the first direction, the third hole has a sealing portion facing the cavity.

[0007] The third hole is arranged on the surface of the extending portion away from the cavity, so that the welding head can extend from the third hole to facilitate welding of the pole and the pole ear or the adapter.

[0008] In one or more of the above embodiments, along the first direction, the distance between the sealing portion away from the bottom wall of the cavity and the surface of the extending portion facing the cavity is L. 1 , the wall thickness of the extension part is L 2 , L 1 =L 2 .

[0009] The distance between the bottom wall of the sealing portion away from the cavity and the surface of the extending portion facing the cavity is equal to the wall thickness of the extending portion, so that the wall thickness of the extending portion is evenly set. On the one hand, it is easy to process, and on the other hand, it can reduce the space occupied by the extending portion and increase the energy density of the secondary battery.

[0010] In one or more of the above embodiments, the first hole is circular, and along the extension direction of the central axis of the first hole, the minimum overlapping dimension between the projection of the connecting piece and the projection of the shell body is 2W 1 , 0.2mm≤W 1 ≤2mm.

[0011] By limiting the minimum single-sided overlap size between the projection of the connecting piece and the projection of the shell body to between 0.2 mm and 2 mm, it is helpful to improve the connection stability between the connecting piece and the shell body. Along the extension direction of the central axis of the first hole, when the minimum single-sided overlap size between the projection of the connecting piece and the projection of the shell body is less than 0.2 mm, the connection distance between the connecting piece and the shell body is insufficient, and there is a risk of the connecting piece and the shell body being separated. When the minimum single-sided overlap size between the projection of the connecting piece and the projection of the shell body is greater than 2 mm, the connection distance between the connecting piece and the shell body is too long, and there is a problem of extra space occupation.

[0012] In one or more of the above embodiments, along the extension direction of the central axis of the second hole, the minimum overlapping dimension between the projection of the insulating member and the projection of the connecting portion is 2W. 2 , 0.2mm≤W 2 ≤2mm.

[0013] By limiting the minimum single-sided overlap size between the projection of the insulating member and the projection of the connecting portion to between 0.2 mm and 2 mm, it is helpful to improve the connection stability between the insulating member and the connecting portion. Along the extension direction of the central axis of the second hole, when the minimum single-sided overlap size between the projection of the insulating member and the projection of the connecting portion is less than 0.2 mm, the connection distance between the insulating member and the connecting portion is insufficient, and there is a risk of the insulating member and the connecting portion being detached. When the minimum single-sided overlap size between the projection of the insulating member and the projection of the connecting portion is greater than 2 mm, the connection distance between the insulating member and the connecting portion is too long, and there is a problem of extra space occupation.

[0014] In one or more of the above embodiments, 0.5 mm ≤ W 2 ≤1mm.

[0015] By limiting the single-sided minimum overlap size between the projection of the insulating member and the projection of the connecting portion to between 0.5 mm and 2 mm, the connection stability between the insulating member and the connecting portion can be further improved.

[0016] In one or more of the above embodiments, a coating is provided on the surface of the extending portion extending into the cavity, and the thickness of the coating is T 1 , 0.01mm≤T 1 ≤0.2mm.

[0017] The corrosion resistance of the insertion part is improved by providing a coating on the surface of the insertion part that is inserted into the cavity. When the coating is less than 0.01 mm, the protective effect of the coating is insufficient and there is a risk of corrosion of the insertion part. When the coating is greater than 0.2 mm, the processing is more difficult and the cost is increased.

[0018] In one or more of the above embodiments, 0.02 mm ≤ T 1 ≤0.1mm.

[0019] For some more corrosive electrolytes, when the coating layer of the insertion portion extending into the cavity surface is less than 0.02mm, the coating layer thickness is insufficient, resulting in insufficient corrosion resistance of the insertion portion. When the coating layer of the insertion portion extending into the cavity surface is greater than 0.1mm, the difficulty of the electroplating process will be increased, and the manufacturing cost will increase.

[0020] In one or more of the above embodiments, a through hole is provided on a surface of the connection portion away from the shell body, and the through hole is used to connect the gap.

[0021] The through hole connects the gap, so as to inject the melted insulating member from the through hole into the gap between the connecting portion and the connecting piece, thereby reducing the flow path of the insulating member and improving the sealing effect of the insulating member.

[0022] In one or more of the above embodiments, the material of the insulating member is soda-lime glass or resin-based glass.

[0023] Soda-lime glass or resin-based glass has good chemical stability and mechanical strength. By setting the insulating member to soda-lime glass or resin-based glass, the corrosion resistance of the insulating member to the electrolyte is improved, and the connection stability can be guaranteed at the same time.

[0024] In a second aspect, an embodiment of the present application provides a secondary battery, comprising a shell assembly, an electrode assembly, and a first adapter. The shell assembly is the shell assembly in one or more of the above embodiments. The electrode assembly is accommodated in the cavity, and the electrode assembly includes a first pole ear. One end of the first adapter is connected to the first pole ear, and the other end of the first adapter is connected to the extension portion to form a first welding area, and along the first direction, the projection of the first welding area overlaps with the projection of the third hole of the extension portion.

[0025] By setting the third hole in the insertion part, the electrode assembly can be inserted into the shell and then the insertion part and the first adapter can be welded. At this time, the projection of the first welding area overlaps with the projection of the third hole in the insertion part, so that the first adapter does not need to be bent or overlapped, thereby reducing the space occupied by the first adapter and improving the energy density of the secondary battery.

[0026] In one or more of the above embodiments, the first adapter is connected to the first tab to form a second welding area, and along the second direction, the projection of the second welding area and the projection of the first welding area at least partially overlap, and the second direction is perpendicular to the first direction.

[0027] The projection of the second welding area formed by the connection between the first adapter and the first pole ear at least partially overlaps with the projection of the first welding area in the second direction, so that the first welding area and the second welding area can share space, reducing the space occupied by the first adapter and improving the energy density of the secondary battery.

[0028] In a third aspect, an embodiment of the present application provides an electrical device, comprising a secondary battery in one or more of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of a secondary battery in one embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the disassembled structure of a secondary battery in one embodiment of the present application.

[0031] Figure 3 It is a schematic diagram of the cross-sectional structure of the first pole and the shell body in an embodiment of the present application.

[0032] Figure 4 It is a schematic diagram of the exploded cross-sectional structure of the first pole and the shell body in one embodiment of the present application.

[0033] Figure 5 It is a schematic diagram of the cross-sectional structure of the first pole and the shell body in another embodiment of the present application.

[0034] Figure 6 It is a schematic diagram of the structure of an electrical device in an embodiment of the present application.

[0035] Main component symbols 001, secondary battery; 100, housing assembly; 110, housing body; 111, cavity; 112, bottom shell; 1121, first hole; 113. cover plate; 120. first pole; 121. extending portion; 1211, third hole; 1211a, sealing portion; 122, connecting portion; 1221, through hole; 130, second pole; 140, connecting piece; 1411, second hole; 150, insulating member; 200, electrode assembly; 210, first pole ear; 220, second pole ear; 300, first adapter; 310, first welding area; 320, second welding area; 400, second adapter; 002, electrical device; X, first direction; Y, second direction; Z. Third direction. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "provided on" another component, it can be directly provided on the other component or there may be an intermediate component at the same time.

[0038] Unless otherwise specified, the term "plurality" as used herein means two or more than two.

[0039] The terms "first", "second", etc. are only used to distinguish different objects and shall not be understood as indicating or implying relative importance or implying the quantity, specific order or primary and secondary relationship of the indicated technical features.

[0040] The term "perpendicular" is used to describe an ideal state between two components. In actual production or use, two components may be in a state that is approximately perpendicular to each other. For example, in combination with numerical descriptions, perpendicularity can refer to the angle between two straight lines being within the range of 90°±10°, perpendicularity can also refer to the dihedral angle between two planes being within the range of 90°±10°, and perpendicularity can also refer to the angle between a straight line and a plane being within the range of 90°±10°.

[0041] The term "parallel" is used to describe an ideal state between two components. In actual production or use, two components may be approximately parallel. For example, in combination with numerical descriptions, parallel can refer to the angle between two straight lines being within the range of 180°±10°, parallel can also refer to the dihedral angle between two planes being within the range of 180°±10°, and parallel can also refer to the angle between a straight line and a plane being within the range of 180°±10°.

[0042] It should be noted that when a parameter is greater than, equal to, or less than a certain endpoint value, it should be understood that the endpoint value is allowed to have a tolerance of ±5%.

[0043] It should be recognized that the dimensions of the structures shown in the drawings are given for better understanding and more convenient description, and the present application is not limited to the dimensions shown in the drawings. In order to make the present invention clear, elements irrelevant to the description are omitted from the details of this specification.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] One embodiment of the present application provides a shell assembly, including a shell body, a connecting piece, a first pole and an insulating member. The shell body has a cavity, and a first hole is provided on one side surface of the shell body, and the central axis of the first hole is parallel to the first direction. The connecting piece is arranged on the side of the shell body away from the cavity, and the connecting piece is provided with a second hole. Along the first direction, the projection of the first hole is located within the projection of the second hole, and the second hole is connected to the first hole. The first pole includes a connected insertion portion and a connecting portion. Along the second direction, the insertion portion is located on the side of the connecting portion facing the cavity, the connecting portion surrounds the outer peripheral surface of the insertion portion, the insertion portion passes through the first hole and the second hole along the first direction to extend to the cavity, the connecting portion is located outside the cavity, and there is a gap between the connecting portion and the connecting piece, and the second direction is perpendicular to the first direction. The insulating member fills and seals the gap, and the material of the insulating member is glass.

[0046] In some embodiments, the insulating member fills and seals the gap, and may not need to fill it completely, as long as the insulation and sealing effects are ensured. For example, there may be a gap between the connecting portion and the connecting sheet along the first direction.

[0047] The protruding portion is located on the side of the connecting portion facing the cavity, and extends to the cavity through the first hole and the second hole along the first direction. Compared with the related art, a prefabricated insulating member is used to be arranged between the protruding portion and the wall surface of the annular groove. In order to ensure the assembly tolerance, the prefabricated insulating member and the protruding portion and the wall surface need to retain the assembly tolerance. The insulating member often deforms under pressure to achieve the sealing effect. The technical solution uses glass to fill and seal the gap between the connecting portion and the connecting piece, eliminates the assembly gap between the connecting portion and the connecting piece, and thus improves the sealing performance of the insulating member.

[0048] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features in the following embodiments and examples can be combined with each other.

[0049] See also Figure 1 and Figure 2 An embodiment of the present application provides a secondary battery 001 , which includes a shell assembly 100 and an electrode assembly 200 . The shell assembly 100 includes a shell body 110 . The shell body 110 has a cavity 111 . The electrode assembly 200 is accommodated in the cavity 111 .

[0050] In some embodiments, the shell body 110 includes a bottom shell 112 and a cover plate 113 , and the receiving cavity 111 is formed between the bottom shell 112 and the cover plate 113 .

[0051] In some embodiments, the shell body 110 is a hard shell. As an illustrative example, the bottom shell 112 and the cover plate 113 are both plastic shells or metal shells made of at least one of steel alloy, nickel alloy and copper alloy.

[0052] In some embodiments, the bottom shell 112 and the cover plate 113 are made of the same material, stainless steel or stainless steel.

[0053] In some embodiments, the bottom case 112 and the cover plate 113 are made of different materials.

[0054] In some embodiments, the secondary battery 001 includes a first adapter 300, the housing assembly 100 includes a first pole 120, the electrode assembly 200 has a first pole tab 210, and the first adapter 300 connects the first pole tab 210 and the first pole 120. One end of the first adapter 300 is connected to the first pole tab 210, and the other end of the first adapter 300 is welded to the first pole 120 to form a first welding area S1. Along the first direction X, the projection of the first welding area S1 overlaps with the projection of the first pole 120.

[0055] In some embodiments, the secondary battery 001 includes a second adapter 400, the housing assembly 100 includes a second pole 130, the electrode assembly 200 has a second pole tab 220, and the second adapter 400 connects the second pole tab 220 and the second pole 130. One end of the second adapter 400 is connected to the second pole tab 220, and the other end of the second adapter 400 is welded to the second pole 130 to form a second welding area S2. Along the first direction X, the projection of the second welding area S2 overlaps with the projection of the second pole 130.

[0056] In some embodiments, the first electrode tab 210 is a positive electrode tab, and the first electrode column 120 is a positive electrode column.

[0057] In some embodiments, the second electrode tab 220 is a negative electrode tab, and the second electrode column 130 is a negative electrode column.

[0058] In some embodiments, the electrode assembly 200 is formed by alternately stacking a plurality of first electrode sheets, a plurality of isolation membranes, and a plurality of second electrode sheets to form a laminated structure.

[0059] In some embodiments, the electrode assembly 200 is formed by winding a first electrode sheet, a separator, and a second electrode sheet that are stacked in layers to form a winding structure.

[0060] The following is a detailed description of the configuration of the first pole 120 .

[0061] See also Figure 2 and Figure 3 In some embodiments, a first hole 1121 is provided on one side surface of the shell body 110 , and a central axis of the first hole 1121 is parallel to the first direction X.

[0062] The shell assembly 100 also includes a connecting piece 140 and an insulating member 150. The connecting piece 140 is arranged on the side of the shell body 110 away from the cavity 111. The connecting piece 140 is provided with a second hole 1411. Along the first direction X, the projection of the first hole 1121 is located within the projection of the second hole 1411, and the second hole 1411 is connected to the first hole 1121.

[0063] In some embodiments, the first pole 120 includes an extending portion 121 and a connecting portion 122 connected to each other. Along the second direction Y, the extending portion 121 is located on the side of the connecting portion 122 facing the cavity 111, and the connecting portion 122 surrounds the outer peripheral surface 1213 of the extending portion 121. The extending portion 121 extends to the cavity 111 through the first hole 1121 and the second hole 1411 along the first direction X, and the second direction Y is perpendicular to the first direction X.

[0064] The connecting portion 122 is located outside the cavity 111 , and there is a gap between the connecting portion 122 and the connecting sheet 140 .

[0065] In some embodiments, the bottom shell 112 and the connecting portion 142 are connected by welding.

[0066] Compared with the related art, a prefabricated insulating part 150 is used to be arranged between the protrusion and the wall of the annular groove. In order to ensure the assembly tolerance, the assembly tolerance needs to be retained between the prefabricated insulating part 150 and the protrusion and the wall. The insulating part 150 is often deformed under pressure to achieve a sealing effect.

[0067] In the technical solution, the insulating member 150 has fluidity after melting, the melted insulating member 150 fills the gap, and the cooled insulating member 150 seals the gap. The insulating member 150 is made of glass. The gap between the connecting portion 122 and the connecting piece 140 is filled by the melted glass, and the assembly gap between the connecting portion 122 and the connecting piece 140 is eliminated, thereby improving the sealing performance of the insulating member 150.

[0068] In some embodiments, a third hole 1211 is disposed on a surface of the extending portion 121 away from the cavity 111 . Along the first direction X, the third hole 1211 has a sealing portion 1211 a facing the cavity 111 .

[0069] In some embodiments, the insertion portion 121 is in a cylindrical shape with one side open, and the connecting portion 142 is in a circular ring shape. In an ideal situation, the central axis of the third hole 1211 is colinear with the central axes of the insertion portion 121 and the connecting portion 122 .

[0070] See also Figure 3 and Figure 4 In some embodiments, along the first direction X, the distance between the sealing portion 1211a away from the bottom wall of the cavity 111 and the surface of the extending portion 121 facing the cavity 111 is L 1 , the wall thickness of the extending portion 121 is L 2 , L 1 =L 2 By setting the distance between the sealing portion 1211a away from the bottom wall of the cavity 111 and the surface of the insertion portion 121 facing the cavity 111 to be equal to the wall thickness of the insertion portion 121, the wall thickness of the insertion portion 121 is uniformly set, which is convenient for processing on the one hand, and can reduce the space occupied by the insertion portion 121 on the other hand, thereby increasing the energy density of the secondary battery 001.

[0071] In some embodiments, the first hole 1121 is circular, and along the extension direction of the central axis of the first hole 1121, the minimum overlap size between the projection of the connecting piece 140 and the projection of the shell body 110 is 2W. 1 , 0.2mm≤W 1By limiting the single-side minimum overlap size of the projection of the connecting piece 140 and the projection of the shell body 110 to between 0.2 mm and 2 mm, it is beneficial to improve the connection stability between the connecting piece 140 and the shell body 110 .

[0072] When the minimum overlap size of the projection of the connecting piece 140 and the projection of the shell body 110 on one side is less than 0.2 mm along the extension direction of the central axis of the first hole 1121, the connection distance between the connecting piece 140 and the shell body 110 is insufficient, and there is a risk of the connecting piece 140 and the shell body 110 being separated. When the minimum overlap size of the projection of the connecting piece 140 and the projection of the shell body on one side is greater than 2 mm, the connection distance between the connecting piece 140 and the shell body 110 is too long, and there is a problem of extra space occupation.

[0073] In some embodiments, along the extension direction of the central axis of the second hole 1411, the minimum overlap size between the projection of the insulating member 150 and the projection of the connecting portion 122 is 2W. 2 , 0.2mm≤W 2 By limiting the single-side minimum overlap size of the projection of the insulating member 150 and the projection of the connecting portion 122 to between 0.2 mm and 2 mm, it is beneficial to improve the connection stability between the insulating member 150 and the connecting portion 122 .

[0074] When the minimum overlap size of the projection of the insulating member 150 and the projection of the connecting portion 122 on one side is less than 0.2 mm along the extension direction of the central axis of the second hole 1411, the connection distance between the insulating member 150 and the connecting portion 122 is insufficient, and there is a risk of separation between the insulating member 150 and the connecting portion 122. When the minimum overlap size of the projection of the insulating member 150 and the projection of the connecting portion 122 on one side is greater than 2 mm, the connection distance between the insulating member 150 and the connecting portion 122 is too long, and there is a problem of extra space occupation.

[0075] Preferably, 0.5 mm ≤ W 2 ≤1mm, by limiting the single-sided minimum overlapping dimension of the projection of the insulating member 150 and the projection of the connecting portion 122 to between 0.5mm and 2mm, the connection stability between the insulating member 150 and the connecting portion 122 can be further improved.

[0076] In some embodiments, W 2 The value of is any one of 0.5, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64, 0.66, 0.68, 0.7, 0.72, 0.74, 0.76, 0.78, 0.8, 0.82, 0.84, 0.86, 0.88, 0.9, 0.92, 0.94, 0.96, 0.98, and 1.

[0077] In some embodiments, a coating layer (not shown) is provided on the surface of the extending portion 121 extending into the cavity 111 , thereby improving the corrosion resistance of the extending portion 121 .

[0078] The thickness of the coating is T 1 , 0.01mm≤T 1 When the coating is less than 0.01 mm, the protective effect of the coating is insufficient, and there is a risk of corrosion of the protruding portion 121. When the coating is greater than 0.2 mm, the processing is more difficult and the cost is increased.

[0079] Preferably, 0.02mm≤T 1 ≤0.1mm. For some more corrosive electrolytes, when the coating layer of the insertion portion 121 extending into the cavity 111 surface is less than 0.02mm, the coating layer thickness is insufficient, resulting in insufficient corrosion resistance of the insertion portion 121. When the coating layer of the insertion portion 121 extending into the cavity 111 surface is greater than 0.1mm, the difficulty of the electroplating process will be increased, and the manufacturing cost will increase.

[0080] In some embodiments, T 1 The value of is any one of 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, and 0.1.

[0081] See also Figure 5 In some embodiments, the insertion portion 121 is a solid structure, that is, no hole is provided on the surface of the insertion portion 121. By providing the insertion portion 121 as a solid structure, on the one hand, the structural strength of the pole can be improved, and on the other hand, for the secondary battery 001 with a smaller size, the insertion portion 121 with a solid structure has better welding stability with the pole ear or adapter.

[0082] In some embodiments, a through hole 1221 is provided on the surface of the connecting portion 122 away from the shell body 110. The through hole 1221 is used to connect the gap, which is conducive to injecting the molten insulating member 150 from the through hole 1221 into the gap between the connecting portion 122 and the connecting piece 140, reducing the flow path of the insulating member 150 and improving the sealing effect of the insulating member 150.

[0083] In some embodiments, the material of the connecting piece 140 is the same as the material of the first pole 120 .

[0084] In some embodiments, the material of the insulating member 150 is soda-lime glass or resin-based glass. Soda-lime glass or resin-based glass has good chemical stability and mechanical strength. By setting the insulating member 150 to soda-lime glass or resin-based glass, the corrosion resistance of the insulating member 150 to the electrolyte is improved, and the connection stability can be guaranteed at the same time.

[0085] See also Figure 6 , an embodiment of the present application provides an electric device 002, comprising the secondary battery 001 in the above embodiment.

[0086] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A housing assembly, characterized in that: include: The shell body has a cavity, and a first hole is provided on one side surface of the shell body, and the central axis of the first hole is parallel to the first direction; A connecting piece, arranged on a side of the shell body away from the cavity, the connecting piece is provided with a second hole, along the first direction, the projection of the first hole is located within the projection of the second hole, and the second hole is connected to the first hole; A first pole, the first pole comprising an extending portion and a connecting portion connected to each other, the extending portion being located on a side of the connecting portion facing the cavity along the second direction, the connecting portion surrounding an outer peripheral surface of the extending portion, the extending portion extending to the cavity through the first hole and the second hole along the first direction, the connecting portion being located outside the cavity, a gap being provided between the connecting portion and the connecting sheet, and the second direction being perpendicular to the first direction; An insulating member fills and seals the gap, and the insulating member is made of glass.

2. The housing assembly according to claim 1, wherein: A third hole is disposed on a surface of the extending portion away from the cavity. Along the first direction, the third hole has a sealing portion facing the cavity.

3. The housing assembly according to claim 2, wherein: Along the first direction, the distance between the bottom wall of the sealing portion away from the cavity and the surface of the extending portion facing the cavity is L1, the wall thickness of the extending portion is L2, and L1=L2.

4. The housing assembly according to claim 1, wherein: The first hole is circular, and along the extension direction of the central axis of the first hole, the minimum overlapping dimension between the projection of the connecting piece and the projection of the shell body is 2W1, 0.2mm≤W1≤2mm.

5. The housing assembly according to claim 1, wherein: Along the extension direction of the central axis of the second hole, the minimum overlapping dimension between the projection of the insulating member and the projection of the connecting portion is 2W2, 0.2 mm≤W2≤2 mm.

6. The housing assembly according to claim 5, characterized in that: 0.5mm≤W2≤1mm.

7. The housing assembly according to claim 1, wherein: The surface of the extending portion extending into the cavity is provided with a coating, and the thickness of the coating is T1, 0.01 mm≤T1≤0.2 mm.

8. The housing assembly according to claim 7, wherein: 0.02mm≤T1≤0.1mm.

9. The housing assembly according to claim 1, wherein: A through hole is provided on a surface of the connection portion away from the shell body, and the through hole is used to connect the gap.

10. The housing assembly according to any one of claims 1 to 9, characterized in that: The insulating member is made of soda-lime glass or resin-based glass.

11. A secondary battery, characterized in that: include: A shell assembly, wherein the shell assembly is the shell assembly according to any one of claims 2 to 10; An electrode assembly, the electrode assembly is accommodated in the cavity, and the electrode assembly includes a first electrode tab; A first adapter, one end of which is connected to the first pole ear, and the other end of which is connected to the insertion portion to form a first welding area, and along the first direction, a projection of the first welding area overlaps with a projection of the third hole of the insertion portion.

12. The secondary battery according to claim 11, wherein: The first adapter is connected to the first electrode tab to form a second welding area. Along a second direction, a projection of the second welding area and a projection of the first welding area at least partially overlap. The second direction is perpendicular to the first direction.

13. An electrical device, characterized in that: Comprising the secondary battery as claimed in claim 12.

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