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, a first hole is formed in the surface of one side of the shell body, and the central axis of the first hole is parallel to the first direction. The connecting piece comprises an extending part and a connecting part which are connected, the connecting part is arranged on the side face, away from the containing cavity, of the shell body, and the extending part extends into the first hole in the first direction; the extending part is provided with a second hole, and the central axis of the second hole is parallel to the first direction. In the first direction, the projection of the extending part is located in the projection of the connecting part, and the projection of the second hole is located in the projection of the first hole. The first pole penetrates through the second hole in the first direction and extends into the containing cavity. And the insulating part seals and fills the gap, 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 a first direction. The connecting piece includes a connected insertion portion and a connecting portion, and the connecting portion is arranged on the side of the shell body away from the cavity, and the insertion portion extends into the first hole along a first direction; the insertion portion is provided with a second hole, and the central axis of the second hole is parallel to the first direction. Along the first direction, the projection of the insertion portion is located within the projection of the connecting portion, and the projection of the second hole is located within the projection of the first hole. The first pole extends to the cavity through the second hole along the first direction, and there is a gap between the outer peripheral surface of the first pole and the hole wall of the second hole. The insulating member fills and seals the gap, and the material of the insulating member is glass.

[0005] The first pole extends through the second hole along the first direction to the cavity. Compared with the related art, a prefabricated insulating member is used to be arranged between the protrusion and the wall of the annular groove. In order to ensure the assembly tolerance, the prefabricated insulating member and the protrusion and the wall 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 outer peripheral surface of the first pole and the hole wall of the second hole, eliminating the assembly gap between the first pole and the second hole, thereby improving the sealing performance of the insulating member.

[0006] In the above embodiments, a boss is provided on the surface of the shell body away from the cavity, the boss and the first hole are located on the same side surface of the shell body, and the first hole penetrates the boss and the shell body along the first direction; the connecting part is connected to the surface of the boss away from the shell body, and the boss is sealed and connected to the connecting part.

[0007] By providing the boss, the shell body has a thicker connection position, which is beneficial to improving the connection stability between the shell body and the connection part.

[0008] In one or more of the above embodiments, the protruding portion passes through the boss and the shell body and extends into the receiving cavity.

[0009] The extending portion passes through the boss and the shell body, thereby increasing the sealing length of the insulating member in the first direction, which is beneficial to further improving the sealing performance of the insulating member.

[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 portion and the projection of the shell body is 2W1, 0.2mm≤W1≤2mm.

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

[0012] In one or more of the above embodiments, along the second direction, the projection of the insulating member is located within the projection of the first pole, the overlapping length of the projection of the insulating member and the projection of the first pole is L1, the length of the first pole is L2, 0.5≤L1 / L2≤0.9, and the second direction is perpendicular to the first direction.

[0013] Along the second direction, the projection of the insulating member is located within the projection of the first pole, so that the insulating member does not exceed the end face of the first pole facing the cavity, and does not exceed the end face of the first pole away from the cavity, thereby improving the interference problem of the insulating member with the welding of the two end faces of the first pole. By limiting the ratio of the overlapping length L1 of the projection of the insulating member and the projection of the first pole to the length L2 of the first pole to between 0.5 and 0.9, it is beneficial to improve the sealing performance of the insulating member. If the ratio of the overlapping length L1 of the projection of the insulating member and the projection of the first pole to the length L2 of the first pole is less than 0.5, the sealing length of the insulating member is insufficient, thereby affecting the sealing strength of the insulating member, and then the sealing performance of the insulating member. If the ratio of the overlapping length L1 of the projection of the insulating member and the projection of the first pole to the length L2 of the first pole is greater than 0.9, the sealing length of the insulating member is too long, which easily leads to insufficient filling of the insulating member, and the problem of unsealed between the first pole and the hole wall of the second hole occurs.

[0014] In one or more of the above embodiments, 0.75≤L1 / L2≤0.8.

[0015] By limiting the ratio of the overlapping length L1 of the projection of the insulating member and the projection of the first pole to the length L2 of the first pole to between 0.75 and 0.8, it is helpful to further improve the sealing performance of the insulating member. If the ratio of the overlapping length L1 of the projection of the insulating member and the projection of the first pole to the length L2 of the first pole is less than 0.75, then for some secondary batteries with high expansion rates, the sealing length of the insulating member is insufficient, thereby affecting the sealing strength of the insulating member and the sealing performance of the insulating member. If the ratio of the overlapping length L1 of the projection of the insulating member and the projection of the first pole to the length L2 of the first pole is greater than 0.8, then the sealing length of the insulating member is too long, which easily leads to insufficient filling of the insulating member, and the problem of unsealing occurs between the first pole and the hole wall of the second hole.

[0016] In one or more of the above embodiments, a coating is provided on the surface of the first pole extending into the cavity, and the thickness of the coating is T1, 0.01 mm≤T1≤0.2 mm.

[0017] The first pole is provided with a coating on the surface of the first pole extending into the cavity, thereby improving the corrosion resistance of the first pole. 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 first pole. When the coating is greater than 0.01 mm, the processing is difficult and the cost is increased.

[0018] In one or more of the above embodiments, 0.02 mm ≤ T1 ≤ 0.1 mm.

[0019] For some more corrosive electrolytes, when the first pole extends into the cavity surface coating less than 0.02mm, the coating thickness is insufficient, resulting in insufficient corrosion resistance of the first pole. When the first pole extends into the cavity surface coating 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, the material of the insulating member is soda-lime glass or resin-based glass.

[0021] 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.

[0022] In the second aspect, an embodiment of the present application provides a secondary battery, including a shell assembly, an electrode assembly and a first adapter, the shell assembly is the shell assembly in one or more of the above-mentioned embodiments, the electrode assembly is accommodated in a cavity, 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 first pole column to form a first welding area.

[0023] The secondary battery uses the melted insulating member to fill the gap between the outer circumference of the first pole and the wall of the second hole, thereby utilizing the fluidity of the melted insulating member to improve the sealing performance of the insulating member, thereby improving the safety of the secondary battery.

[0024] 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-mentioned embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of a secondary battery in one embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the disassembled structure of a secondary battery in one embodiment of the present application.

[0027] Figure 3 It is a schematic diagram of the overall structure of the first pole and the shell body in an embodiment of the present application.

[0028] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure taken along position IV-IV.

[0029] 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.

[0030] Figure 6 It is a schematic diagram of the structure of an electrical device in an embodiment of the present application.

[0031] Main component symbols 001, secondary battery; 100, housing assembly; 110, housing body; 111, cavity; 112, bottom shell; 1121, first hole; 113, cover plate; 114, boss; 120, first pole; 121, first part; 1211, connecting groove; 122, second part; 1221, connecting boss; 123, plating layer; 130, second pole; 140, connecting piece; 141, extending portion; 1411, second hole; 142, connecting portion; 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. The third direction. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] Unless otherwise specified, the term "plurality" as used herein means two or more than two.

[0035] 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.

[0036] 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°.

[0037] 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°.

[0038] 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%.

[0039] 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.

[0040] 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.

[0041] 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 includes a connected insertion portion and a connecting portion, and the connecting portion is arranged on the side of the shell body away from the cavity, and the insertion portion extends into the first hole along the first direction; the insertion portion is provided with a second hole, and the central axis of the second hole is parallel to the first direction. Along the first direction, the projection of the insertion portion is located within the projection of the connecting portion, and the projection of the second hole is located within the projection of the first hole. The first pole extends to the cavity through the second hole along the first direction, and there is a gap between the outer peripheral surface of the first pole and the hole wall of the second hole. The insulating member fills and seals the gap, and the material of the insulating member is glass.

[0042] In some embodiments, the insulating member fills and seals the gap, and it does not need to be completely filled, as long as the insulation and sealing effects are guaranteed. For example, there may be a gap between the outer peripheral surface of the first pole and the hole wall of the second hole along a direction perpendicular to the first direction.

[0043] The first pole extends through the second hole along the first direction to the cavity. Compared with the related art, a prefabricated insulating member is used to be arranged between the protrusion and the wall of the annular groove. In order to ensure the assembly tolerance, the prefabricated insulating member and the protrusion and the wall 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 outer peripheral surface of the first pole and the hole wall of the second hole, eliminating the assembly gap between the first pole and the second hole, thereby improving the sealing performance of the insulating member.

[0044] 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.

[0045] See also Figure 1 and Figure 2An 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 .

[0046] 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 .

[0047] 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.

[0048] In some embodiments, the bottom shell 112 and the cover plate 113 are made of stainless steel.

[0049] In some embodiments, the bottom case 112 and the cover plate 113 are made of different materials.

[0050] 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.

[0051] 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.

[0052] In some embodiments, the first electrode tab 210 is a positive electrode tab, and the first electrode column 120 is a positive electrode column.

[0053] In some embodiments, the second electrode tab 220 is a negative electrode tab, and the second electrode column 130 is a negative electrode column.

[0054] 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.

[0055] 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.

[0056] The following is a detailed description of the configuration of the first pole 120 .

[0057] See also Figure 2 , Figure 3 and Figure 4 In some embodiments, the housing assembly 100 further includes a connecting piece 140 and an insulating member 150. A first hole 1121 is disposed on one side surface of the bottom housing 112, and a central axis of the first hole 1121 is parallel to the first direction X.

[0058] In some embodiments, the bottom shell 112 and the connecting portion 142 are connected by welding.

[0059] In some embodiments, the connecting piece 140 includes a connected extension portion 141 and a connecting portion 142. Along the first direction X, the projection of the extension portion 141 is located within the projection of the connecting portion 142. The connecting portion 142 is arranged on the side of the shell body 110 away from the cavity 111, and the extension portion 141 extends into the first hole 1121 along the first direction X.

[0060] The insertion portion 141 is provided with a second hole 1411, the central axis of the second hole 1411 is parallel to the first direction X, and along the first direction X, the projection of the second hole 1411 is located within the projection of the first hole 1121. The first pole 120 extends to the cavity 111 through the second hole 1411 along the first direction X, and there is a gap between the outer peripheral surface of the first pole 120 and the hole wall of the second hole 1411.

[0061] In some embodiments, the insertion portion 141 and the connection portion 142 are both arranged in a circular ring shape. In an ideal condition, the projection of the insertion portion 141 and the projection of the connection portion 142 are arranged concentrically.

[0062] 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.

[0063] In the technical solution, the insulating member 150 is made of glass, which has fluidity after melting. The molten glass fills the gap, and the cooled glass seals the gap. By utilizing the fluidity of the molten glass, the molten glass fills the gap between the outer peripheral surface of the first pole 120 and the hole wall of the second hole 1411, eliminating the assembly gap between the first pole 120 and the second hole 1411, thereby improving the sealing performance of the insulating member 150.

[0064] See also Figure 3 and Figure 4 In some embodiments, a boss 114 is provided on the surface of the shell body 110 away from the cavity 111. The boss 114 and the first hole 1121 are located on the same side surface of the shell body 110. The first hole 1121 penetrates the boss 114 and the shell body 110 along the first direction X. By providing the boss 114, the shell body 110 has a thicker connection position.

[0065] The connection portion 142 is connected to the surface of the boss 114 away from the shell body 110 , and the boss 114 is sealedly connected to the connection portion 142 , which is beneficial to improving the connection stability between the shell body 110 and the connection portion 142 .

[0066] In some embodiments, the boss 114 and the shell body 110 are integrally formed.

[0067] The projection of the connecting piece 140 is located within the projection of the boss 114 along the first direction X. In some embodiments, the extending portion 141 passes through the boss 114 and the shell body 110 and extends to the cavity 111, thereby increasing the sealing length of the insulating member 150 in the first direction X, which is beneficial to further improve the sealing performance of the insulating member 150.

[0068] 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 dimension between the projection of the connection portion 142 and the projection of the shell body 110 is 2W1, 0.2mm≤W1≤2mm. By limiting the single-sided minimum overlap dimension between the projection of the connection portion 142 and the projection of the shell body 110 to between 0.2mm and 2mm, it is helpful to improve the connection stability between the connection portion 142 and the shell body 110.

[0069] Along the extension direction of the central axis of the first hole 1121, when the minimum single-sided overlap dimension between the projection of the connection portion 142 and the projection of the shell body 110 is less than 0.2 mm, the connection distance between the connection portion 142 and the shell body 110 is insufficient, and there is a risk of the connection portion 142 being separated from the shell body 110. When the minimum single-sided overlap dimension between the projection of the connection portion 142 and the projection of the shell body 110 is greater than 2 mm, the connection distance between the connection portion 142 and the shell body 110 is too long, resulting in the problem of extra space occupation.

[0070] In some embodiments, the value of W1 is any one of 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, or 2.

[0071] In some embodiments, along the second direction Y, the projection of the insulating member 150 is located within the projection of the first pole 120, so that the insulating member 150 does not exceed the end surface of the first pole 120 facing the cavity 111, and does not exceed the end surface of the first pole 120 away from the cavity 111, thereby improving the interference problem of the insulating member 150 with the welding of the two end surfaces of the first pole 120.

[0072] The overlapping length of the projection of the insulating member 150 and the projection of the first pole 120 is L1, the length of the first pole 120 is L2, 0.5≤L1 / L2≤0.9, and the second direction Y is perpendicular to the first direction X. By limiting the ratio of the overlapping length L1 of the projection of the insulating member 150 and the projection of the first pole 120 to the length L2 of the first pole 120 to between 0.5 and 0.9, it is beneficial to improve the sealing performance of the insulating member 150.

[0073] If the ratio of the overlap length L1 of the projection of the insulating member 150 and the projection of the first pole 120 to the length L2 of the first pole 120 is less than 0.5, the sealing length of the insulating member 150 is insufficient, thereby affecting the sealing strength of the insulating member 150 and the sealing performance of the insulating member 150. If the ratio of the overlap length L1 of the projection of the insulating member 150 and the projection of the first pole 120 to the length L2 of the first pole 120 is greater than 0.9, the sealing length of the insulating member 150 is too long, which may easily lead to insufficient filling of the insulating member 150, and the problem of unsealing between the first pole 120 and the hole wall of the second hole 1411.

[0074] Preferably, 0.75≤L1 / L2≤0.8. By limiting the ratio of the overlapping length L1 of the projection of the insulating member 150 and the projection of the first pole 120 to the length L2 of the first pole 120 to between 0.75 and 0.8, the sealing performance of the insulating member 150 is further improved.

[0075] If the ratio of the overlap length L1 of the projection of the insulating member 150 and the projection of the first pole 120 to the length L2 of the first pole 120 is less than 0.75, then for some secondary batteries 001 with high expansion rates, the sealing length of the insulating member 150 is insufficient, thereby affecting the sealing strength of the insulating member 150 and the sealing performance of the insulating member 150. If the ratio of the overlap length L1 of the projection of the insulating member 150 and the projection of the first pole 120 to the length L2 of the first pole 120 is greater than 0.8, then the sealing length of the insulating member 150 is too long, which may easily lead to insufficient filling of the insulating member 150, and the problem of unsealing between the first pole 120 and the hole wall of the second hole 1411.

[0076] In some embodiments, the value of L1 / L2 is any one of 0.75, 0.755, 0.76, 0.765, 0.77, 0.775, 0.78, 0.785, 0.79, 0.795, and 0.8.

[0077] In some embodiments, a coating 123 is disposed on the surface of the first pole 120 extending into the cavity 111 . By disposing the coating 123 on the surface of the first pole 120 extending into the cavity 111 , the corrosion resistance of the first pole 120 is improved.

[0078] In some embodiments, the thickness of the coating 123 is T1, 0.01 mm ≤ T1 ≤ 0.2 mm. When the coating 123 is less than 0.01 mm, the protection effect of the coating 123 is insufficient, and there is a risk of corrosion of the first pole 120. When the coating 123 is greater than 0.01 mm, the processing difficulty is greater and the cost is increased.

[0079] Preferably, 0.02mm≤T1≤0.1mm. For some more corrosive electrolytes, when the first pole 120 extends into the coating 123 on the surface of the cavity 111 by less than 0.02mm, the thickness of the coating 123 is insufficient, resulting in insufficient corrosion resistance of the first pole 120. When the first pole 120 extends into the coating 123 on the surface of the cavity 111 by more than 0.1mm, the difficulty of the electroplating process will be increased, and the manufacturing cost will increase.

[0080] In some embodiments, the thickness of the coating layer 123 is any one of 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, and 0.1.

[0081] See also Figure 2 and Figure 5 In some embodiments, the first pole 120 includes a first portion 121 and a second portion 122, and the second portion 122 is disposed at one end of the first portion 121 facing the cavity 111. The end surface of the second portion 122 away from the first portion 121 is used to connect to the first adapter 300, and along the first direction X, the projection of the first portion 121 is located within the projection of the second portion 122, and the end surface area of ​​the second portion 122 is greater than the end surface area of ​​the first portion 121, so as to facilitate the connection between the first adapter 300 and the second portion 122, which is beneficial to improve the connection stability between the first adapter 300 and the second portion 122.

[0082] In some embodiments, the end surface of the first portion 121 facing the cavity 111 is provided with a connection groove 1211, and the end surface of the second portion 122 facing the first portion 121 is provided with a connection boss 1221. The connection boss 1221 extends into the connection groove 1211, and the surface of the connection boss 1221 is fixedly connected to the connection groove 1211. The connection between the connection boss 1221 and the connection groove 1211 is beneficial to improve the connection strength between the first portion 121 and the second portion 122.

[0083] In some embodiments, the material of the connecting piece 140 is the same as that 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 ensured 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 limit the present application. As long as they are within the spirit 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, the connecting piece comprising a connected insertion portion and a connecting portion, the connecting portion being arranged on a side of the shell body away from the cavity, the insertion portion extending into the first hole along the first direction; the insertion portion is provided with a second hole, the central axis of the second hole being parallel to the first direction; along the first direction, the projection of the insertion portion is located within the projection of the connecting portion, and the projection of the second hole is located within the projection of the first hole; A first pole, the first pole extending through the second hole along the first direction to the cavity, and a gap is formed between an outer peripheral surface of the first pole and a hole wall of the second hole; 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 boss is provided on the surface of the shell body away from the cavity, the boss and the first hole are located on the same side surface of the shell body, and the first hole penetrates the boss and the shell body along the first direction; the connecting part is connected to the surface of the boss away from the shell body, and the boss is sealed and connected to the connecting part.

3. The housing assembly according to claim 2, wherein: The protruding portion passes through the boss and the shell body and extends to the receiving cavity.

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 portion and the projection of the shell body is 2W1, 0.2mm≤W1≤2mm.

5. The housing assembly according to claim 1, wherein: Along the second direction, the projection of the insulating member is located within the projection of the first pole, the overlapping length of the projection of the insulating member and the projection of the first pole is L1, the length of the first pole is L2, 0.5≤L1 / L2≤0.9, and the second direction is perpendicular to the first direction.

6. The housing assembly according to claim 5, characterized in that: 0.75≤L1 / L2≤0.

8.

7. The housing assembly according to claim 1, wherein: A coating is provided on the surface of the first pole extending into the cavity, 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 any one of claims 1 to 8, characterized in that: The insulating member is made of soda-lime glass or resin-based glass.

10. A secondary battery, characterized in that: include: A shell assembly, wherein the shell assembly is the shell assembly according to any one of claims 1 to 9; 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 lug, and the other end of which is connected to the first pole to form a first welding area.

11. An electrical device, characterized in that: Comprising the secondary battery as claimed in claim 10.

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