Secondary battery and electric device

Abstract

The utility model discloses a secondary battery and a power utilization device, the secondary battery comprises a shell, an electrode assembly and a top cover assembly, the top cover assembly comprises a top cover sheet, the top cover sheet is connected with the shell, the top cover sheet is provided with a mounting hole, the mounting hole penetrates through the top cover sheet, the hole wall of the mounting hole is provided with a first bulge, and the first bulge extends towards the central axis of the mounting hole; the pole comprises a pole body and a second bulge arranged on the pole body; at least part of the second protrusion faces the first protrusion in the thickness direction of the top cover piece. And the first insulating part is arranged on one side, far away from the electrode assembly, of the top cover plate. According to the top cover structure, the second protrusions are arranged on the pole columns, the first protrusions are arranged on the hole walls of the mounting holes, rotary embedding and positioning of the pole columns are achieved, and due to the fact that the first protrusions are opposite to the second protrusions, the force bearing strength of the pole columns and the overall strength of the top cover structure are improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to secondary batteries and electrical devices. Background Art

[0002] As an important component of secondary batteries, the top cover has very high requirements for its safety design, deadweight and space utilization. At present, aluminum alloy top covers can be divided into injection molded top covers and riveted / welded top covers. Among them, the injection molded top cover assembly process is relatively simple and the cost is low, but the end face of the pole on the outside of the injection molded top cover is smaller than the pole plate opening, resulting in the load-bearing component on one side of the top cover being a plastic part with relatively poor strength; the riveted / welded top cover requires the addition of a rivet block or structural part on the outside of the top cover. During assembly, the lower pole is first passed through the positioning hole of the top cover plate, and then the rivet block or structural part is connected to the protruding end of the pole. Its assembly process is more complicated and the cost is higher. Utility Model Content

[0003] Purpose of the utility model: The embodiment of the present application provides a secondary battery and an electrical device to improve the structural strength of the top cover and simplify the assembly process of the top cover.

[0004] Technical solution: The embodiment of the present application provides a secondary battery, including:

[0005] A housing having a receiving cavity;

[0006] An electrode assembly, wherein the electrode assembly is disposed in the accommodating cavity;

[0007] A top cover assembly, the top cover assembly comprising:

[0008] A top cover sheet, the top cover sheet is connected to the shell and covers the accommodating cavity, the top cover sheet is provided with a mounting hole, the top cover sheet has a thickness direction X, the mounting hole penetrates the top cover sheet along the thickness direction X, the mounting hole has a radial direction Y perpendicular to the thickness direction X, a hole wall of the mounting hole is provided with a first protrusion, and the first protrusion extends along the radial direction Y toward the central axis of the mounting hole;

[0009] A pole, the pole comprising a pole body and a second protrusion arranged on the pole body; the pole body is passed through the mounting hole; the second protrusion is located outside the accommodating cavity, and at least a portion of the second protrusion is arranged toward the first protrusion in the thickness direction X, and a first gap is formed between the first protrusion and the second protrusion in the thickness direction X;

[0010] A first insulating member, the first insulating member is arranged on a side of the top cover sheet away from the electrode assembly; the first insulating member surrounds the outer circumference of the pole and is respectively connected to the pole and the top cover sheet; the first insulating member at least partially fills the first gap, and a portion of the first insulating member extends to the mounting hole and is respectively connected to the pole body and the hole wall of the mounting hole.

[0011] In some embodiments, a second gap is provided between the pole body and the first protrusion in the radial direction Y, the second gap is connected to the first gap, and a portion of the first insulating member extends to the second gap and is respectively connected to the pole body and the first protrusion;

[0012] A third gap is provided between the pole body and the hole wall of the mounting hole in the radial direction Y, the third gap is connected to the second gap, and a portion of the first insulating member extends to the third gap and is respectively connected to the pole body and the hole wall of the mounting hole.

[0013] In some embodiments, there are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the circumference of the hole wall of the mounting hole, and the third gap is formed between two adjacent first protrusions.

[0014] In some embodiments, the top cover assembly further comprises:

[0015] A bracket, the bracket comprising an extension portion and a limiting portion, the extension portion is arranged on a side of the top cover sheet away from the electrode assembly and is arranged around the mounting hole, the extension portion protrudes from the top cover sheet toward the side away from the electrode assembly; the limiting portion is connected to an end of the extension portion away from the top cover sheet and extends along the radial direction Y toward the central axis of the mounting hole, and at least a portion of the second protrusion is arranged toward the extension portion in the thickness direction X;

[0016] The bracket and the top cover sheet jointly define a mounting groove, part of the pole is located in the mounting groove, a fourth gap is provided between the pole and the bracket, part of the first insulating member fills the fourth gap and is respectively connected to the bracket and the pole.

[0017] In some embodiments, the second protrusion has a second surface facing the first protrusion, and the first protrusion has a first surface facing the second protrusion;

[0018] The pole also includes a protrusion a, which is connected to the second surface and protrudes from the second protrusion in a direction close to the electrode assembly; the first protrusion has a recessed portion a, which penetrates the first surface along the thickness direction X; the protrusion a extends to the recessed portion a along the thickness direction X, and there is a fifth gap between the protrusion a and the inner wall of the recessed portion a, and the first insulating member fills the fifth gap and is respectively connected to the protrusion a and the inner wall of the recessed portion a.

[0019] In some embodiments, the second protrusion has a second surface facing the first protrusion, and the first protrusion has a first surface facing the second protrusion;

[0020] The top cover assembly also includes a protrusion b, which is connected to the first surface and protrudes from the first protrusion in a direction away from the electrode assembly; the second protrusion also has a recessed portion b, which penetrates the second surface along the thickness direction X; the protrusion b extends to the recessed portion b along the thickness direction X, and a fifth gap is provided between the protrusion b and the inner wall of the recessed portion b, and the first insulating member fills the fifth gap and is respectively connected to the protrusion b and the inner wall of the recessed portion b.

[0021] In some embodiments, the top cover sheet has a fourth surface away from the electrode assembly in the thickness direction X, and the first surface is flush with the fourth surface.

[0022] In some embodiments, the protrusion a has a fifth surface away from the second protrusion in the radial direction Y, the second protrusion has a sixth surface away from the pole body in the radial direction Y, and the fifth surface and the sixth surface are coplanarly arranged in the thickness direction X.

[0023] In some embodiments, the pole further includes a connecting portion, the connecting portion is located in the accommodating cavity and connected to a side of the pole body facing the electrode assembly, and a sixth gap is provided between the connecting portion and the top cover sheet in the thickness direction X;

[0024] The top cover assembly also includes:

[0025] a second insulating member, the second insulating member being arranged on a side of the top cover sheet close to the electrode assembly; the second insulating member surrounds the outer circumference of the pole and is connected to the pole, a portion of the second insulating member fills the sixth gap and is respectively connected to the top cover sheet and the connecting portion;

[0026] A seal, the seal surrounds the outer circumference of the pole body and abuts against the pole body; a portion of the seal fills the sixth gap and abuts against any one of the connecting portion, the second insulating member, and the top cover sheet; a portion of the seal extends to the mounting hole and abuts against the hole wall of the mounting hole and any one of the first insulating member.

[0027] In some embodiments, the present application further provides an electrical device, comprising the secondary battery, wherein the secondary battery is used to supply power to the electrical device.

[0028] Beneficial effects: A secondary battery according to an embodiment of the present application comprises: a shell having a receiving cavity; an electrode assembly, the electrode assembly being arranged in the receiving cavity; a top cover assembly, the top cover assembly comprising: a top cover sheet, the top cover sheet being connected to the shell and covering the receiving cavity, the top cover sheet being provided with a mounting hole, the top cover sheet having a thickness direction X, the mounting hole penetrating the top cover sheet along the thickness direction X, the mounting hole having a radial direction Y perpendicular to the thickness direction X, a hole wall of the mounting hole being provided with a first protrusion, the first protrusion extending along the radial direction Y toward the central axis of the mounting hole; a pole, the pole comprising a pole body and a pole arranged at the pole A second protrusion on the column body; the pole body is arranged in the mounting hole; the second protrusion is located outside the accommodating cavity, and at least part of the second protrusion is arranged toward the first protrusion in the thickness direction X, and there is a first gap between the first protrusion and the second protrusion in the thickness direction X; a first insulating member, the first insulating member is arranged on the side of the top cover sheet away from the electrode assembly; the first insulating member surrounds the outer circumference of the pole and is respectively connected to the pole and the top cover sheet; the first insulating member at least partially fills the first gap, and part of the first insulating member extends to the mounting hole and is respectively connected to the pole body and the hole wall of the mounting hole. The secondary battery of the present application realizes the rotational embedding and positioning of the pole by arranging the second protrusion on the pole and the first protrusion on the hole wall of the mounting hole. Since the first protrusion and the second protrusion are relative, the bearing strength of the pole and the overall strength of the top cover structure are improved; under the joint action of the first insulating member, the assembly process is further simplified, and the internal space utilization rate of the battery cell can be increased to a certain extent.

[0029] The electric device of the embodiment of the present application may include all the technical features and beneficial effects of the above-mentioned secondary battery, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1A schematic diagram of the secondary battery structure provided in an embodiment of the present application;

[0032] Figure 2 An exploded schematic diagram of a top cover assembly provided in Example 1 of the present application;

[0033] Figure 3 A schematic diagram of the structure of the pole and the top cover sheet provided in Example 1 of the present application;

[0034] Figure 4 A schematic diagram of a cross-sectional view of a pole assembly is provided for Example 1 of the present application;

[0035] Figure 5 An exploded schematic diagram of a top cover assembly provided in Example 2 of the present application;

[0036] Figure 6 A schematic diagram of a cross-sectional view of a pole assembly provided in Example 2 of the present application;

[0037] Figure 7 An exploded schematic diagram of a top cover assembly provided in Example 3 of the present application;

[0038] Figure 8 A schematic diagram of the pole structure provided in Example 3 of the present application;

[0039] Fig. 9 A schematic diagram of a cross-sectional view of a pole assembly provided in Example 3 of the present application;

[0040] Fig.10 Another schematic diagram of a cross-sectional view of a pole assembly provided in Example 3 of the present application;

[0041] Fig.11 An exploded schematic diagram of a top cover assembly provided in Example 4 of the present application;

[0042] Fig.12 A schematic diagram of a cross-sectional view of a pole assembly provided in Example 4 of the present application;

[0043] Figure numerals: 1-shell, 11-accommodating cavity, 2-electrode assembly, 3-top cover assembly, 31-top cover sheet, 310-mounting hole, 311-first protrusion, 3111-first surface, 3112a-recess, 3112b-recess, 312-fourth surface, 313-third surface, 32-pole, 321-pole body, 322-second protrusion, 3221-second surface, 3222-sixth surface , 323a-protrusion, 323b-protrusion, 3231-fifth surface, 324-connecting portion, 33-first insulating member, 34-bracket, 341-extension portion, 342-limiting portion, 340-installation groove, 35-second insulating member, 36-sealing member, 100-first gap, 200-second gap, 300-third gap, 400-fourth gap, 500-fifth gap, 600-sixth gap. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0045] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0046] Example 1

[0047] See also Figure 1 , Figure 2 , Figure 3 and Figure 4A secondary battery as shown, comprising: a shell 1, an electrode assembly 2 and a top cover assembly 3; the shell 1 has a receiving cavity 11; the electrode assembly 2 is arranged in the receiving cavity 11; wherein the top cover assembly 3 comprises: a top cover sheet 31, a pole 32 and a first insulating member 33; the top cover sheet 31 is connected to the shell 1 and covers the receiving cavity 11, the top cover sheet 31 is provided with a mounting hole 310, the top cover sheet 31 has a thickness direction X, the mounting hole 310 penetrates the top cover sheet 31 along the thickness direction X, the mounting hole 310 has a radial direction Y perpendicular to the thickness direction X, the hole wall of the mounting hole 310 is provided with a first protrusion 311, and the first protrusion 311 extends along the radial direction Y toward the central axis of the mounting hole 310; the pole 32 comprises a pole body 321 and a first insulating member 33 arranged on the pole A second protrusion 322 on the body 321; the pole body 321 is penetrated by the mounting hole 310; the second protrusion 322 is located outside the accommodating cavity 11, and at least a portion of the second protrusion 322 is arranged toward the first protrusion 311 in the thickness direction X, and a first gap 100 is provided between the first protrusion 311 and the second protrusion 322 in the thickness direction X; the first insulating member 33 is arranged on the side of the top cover sheet 31 away from the electrode assembly 2; the first insulating member 33 surrounds the outer circumference of the pole 32 and is respectively connected to the pole 32 and the top cover sheet 31; the first insulating member 33 at least partially fills the first gap 100, and a portion of the first insulating member 33 extends to the mounting hole 310 and is respectively connected to the pole body 321 and the hole wall of the mounting hole 310.

[0048] It should be noted that, in the secondary battery of Example 1, a pole 32 with a special-shaped structure and a special-shaped mounting hole 310 matching the structure are provided. The pole body 321 and the second protrusion 322 of the pole 32 are an integrated structure and can be obtained by machining. When the pole 32 is assembled, the second protrusion 322 first passes through the gap between the first protrusions 311 to realize that the pole body 321 is inserted into the mounting hole 310, and then the pole body 321 rotates around its own rotation axis by a certain angle until at least part of the second protrusion 322 is arranged toward the first protrusion 311 in the thickness direction X. At this time, it can be ensured that the second protrusion 322 and the first protrusion 311 are arranged relative to each other in the thickness direction X. Finally, the composite pole 32 is injection molded by the first insulating member 33 to realize the sealing and insulation of the pole 32. Since the first protrusion 311 and the second protrusion 322 are opposite to each other, when the pole 32 is subjected to the force along the thickness direction X, the first protrusion 311 and the second protrusion 322 can limit each other to improve the bearing strength of the pole, thereby ensuring the structural stability of the pole 32 and improving the overall structural strength of the top cover structure. In addition, since the first insulating member 33 can be filled between the pole 32 and the top cover sheet 31 only by injection molding, especially filled in the first gap 100 and the mounting hole 310, the rotation of the pole 32 relative to the first insulating member 33 and the rotation of the first insulating member 33 relative to the top cover sheet 31 are better avoided, so that the torque bearing capacity of the pole 32 is larger; therefore, under the joint action of the first insulating member 33, the assembly process is further simplified, and since the limiting structure of the pole 32 is arranged outside the accommodating cavity 11, the internal space utilization rate of the housing 1 can be increased to a certain extent.

[0049] In some embodiments, see further Figure 4 A second gap 200 is provided between the pole body 321 and the first protrusion 311 in the radial direction Y, the second gap 200 is communicated with the first gap 100, a portion of the first insulating member 33 extends to the second gap 200 and is respectively connected to the pole body 321 and the first protrusion 311; a third gap 300 is provided between the pole body 321 and the hole wall of the mounting hole 310 in the radial direction Y, the third gap 300 is communicated with the second gap 200, a portion of the first insulating member 33 extends to the third gap 300 and is respectively connected to the pole body 321 and the hole wall of the mounting hole 310.

[0050] It should be noted that when the first insulating member 33 is respectively arranged in the second gap 200 and the third gap 300, a short circuit caused by the connection between the pole 32 and the top cover plate 31 can be prevented, and the first insulating member 33 is connected to the pole body 321, the first protrusion 311 and the hole wall of the mounting hole 310, which can further improve the sealing and fixation of the pole 32.

[0051] In some embodiments, see further Figure 2and Figure 4 There are multiple first protrusions 311, and the multiple first protrusions 311 are arranged at intervals along the circumferential direction of the hole wall of the mounting hole 310, and a third gap 300 is formed between two adjacent first protrusions 311. Figure 2-3 It can be seen that the pole body 321 is a cylindrical structure, three second protrusions 322 are provided, and the second protrusions 322 are fan-shaped structures and are evenly distributed on the outer peripheral wall of the pole body 321; Figure 2-3 Three first protrusions 311 are arranged and evenly distributed on the hole wall of the mounting hole 310. The hole diameter of the mounting hole 310 is slightly larger than the diameter of the pole body 321. On the one hand, it is convenient to embed the pole body 321, and on the other hand, it can retain the channel of the injection molding process.

[0052] Example 2

[0053] See also Figure 1 , Figure 5 and Figure 6, a secondary battery is provided, comprising: a shell 1, an electrode assembly 2 and a top cover assembly 3; the shell 1 has a receiving cavity 11; the electrode assembly 2 is arranged in the receiving cavity 11; wherein the top cover assembly 3 comprises: a top cover sheet 31, a pole 32, a first insulating member 33 and a bracket 34; the top cover sheet 31 is connected to the shell 1 and covers the receiving cavity 11, the top cover sheet 31 is provided with a mounting hole 310, the top cover sheet 31 has a thickness direction X, the mounting hole 310 penetrates the top cover sheet 31 along the thickness direction X, the mounting hole 310 has a radial direction Y perpendicular to the thickness direction X, and the mounting hole 31 0 is provided with a first protrusion 311, and the first protrusion 311 extends along the radial direction Y toward the central axis of the mounting hole 310; the pole 32 includes a pole body 321 and a second protrusion 322 provided on the pole body 321; the pole body 321 is penetrated through the mounting hole 310; the second protrusion 322 is located outside the accommodating cavity 11, and at least part of the second protrusion 322 is arranged toward the first protrusion 311 in the thickness direction X, and a first gap 100 is formed between the first protrusion 311 and the second protrusion 322 in the thickness direction X; the first insulating member 33 is provided at the top The cover sheet 31 is located on a side away from the electrode assembly 2; the first insulating member 33 surrounds the outer periphery of the pole 32 and is respectively connected to the pole 32 and the top cover sheet 31; the first insulating member 33 at least partially fills the first gap 100, and a portion of the first insulating member 33 extends to the mounting hole 310 and is respectively connected to the pole body 321 and the hole wall of the mounting hole 310; the bracket 34 includes an extension portion 341 and a limiting portion 342, the extension portion 341 is arranged on a side of the top cover sheet 31 away from the electrode assembly 2 and is arranged around the mounting hole 310, and the extension portion 341 is facing away from the electrode assembly 2 One side protrudes from the top cover sheet 31; the limiting portion 342 is connected to the end of the extension portion 341 away from the top cover sheet 31 and extends along the radial direction Y toward the central axis of the mounting hole 310, and at least a portion of the second protrusion 322 is arranged toward the extension portion 341 in the thickness direction X; the bracket 34 and the top cover sheet 31 jointly define a mounting groove 340, a portion of the pole 32 is located in the mounting groove 340, and a fourth gap 400 is provided between the pole 32 and the bracket 34, and a portion of the first insulating member 33 is filled in the fourth gap 400 and is respectively connected to the bracket 34 and the pole 32.

[0054] It should be further explained that, compared with Example 1, Example 2 is different in that a bracket 34 is provided on the side of the top cover sheet 31 away from the electrode assembly 2. Since the bracket 34 and the top cover sheet 31 jointly define the mounting groove 340, when the pole 32 and the first insulating member 33 are arranged in the mounting groove 340, the bracket 34 can produce a press-fitting effect on the pole 32 to make the positioning and sealing effect of the pole 32 better. The bracket 34 is similar in structure and appearance to the pole 32, and can be set to a ring or an intermittent ring. The bracket 34 can be welded to the top cover sheet 31, and the welding point is set at its contact position, or it can be set to an integrated structure with the top cover sheet 31 and obtained by machining.

[0055] Example 3

[0056] See also Figure 1 , Figure 7 , Figure 8 and Fig. 9 , a secondary battery is provided, comprising: a shell 1, an electrode assembly 2 and a top cover assembly 3; the shell 1 has a receiving cavity 11; the electrode assembly 2 is arranged in the receiving cavity 11; wherein the top cover assembly 3 comprises: a top cover sheet 31, a pole 32 and a first insulating member 33; the top cover sheet 31 is connected to the shell 1 and covers the receiving cavity 11, the top cover sheet 31 is provided with a mounting hole 310, the top cover sheet 31 has a thickness direction X, the mounting hole 310 penetrates the top cover sheet 31 along the thickness direction X, the mounting hole 310 has a radial direction Y perpendicular to the thickness direction X, the hole wall of the mounting hole 310 is provided with a first protrusion 311, and the first protrusion 311 extends along the radial direction Y toward the central axis of the mounting hole 310; the pole 32 comprises a pole body 321 and a first protrusion 311 arranged at the pole The second protrusion 322 on the body 321; the pole body 321 is provided in the mounting hole 310; the second protrusion 322 is located outside the accommodating cavity 11, and at least part of the second protrusion 322 is arranged toward the first protrusion 311 in the thickness direction X, and there is a first gap 100 between the first protrusion 311 and the second protrusion 322 in the thickness direction X; the first insulating member 33 is provided on the side of the top cover sheet 31 away from the electrode assembly 2; the first insulating member 33 surrounds the outer periphery of the pole 32 and is respectively connected to the pole 32 and the top cover sheet 31; the first insulating member 33 at least partially fills the first gap 100, and part of the first insulating member 33 extends to the mounting hole 310 and is respectively connected to the pole body 321 and the hole wall of the mounting hole 310. Among them, see further Figure 8 and Fig. 9 The second protrusion 322 has a second surface 3221 facing the first protrusion 311, and the first protrusion 311 has a first surface 3111 facing the second protrusion 322; the pole 32 also includes a protrusion 323a, the protrusion 323a is connected to the second surface 3221 and protrudes from the second protrusion 322 in a direction close to the electrode assembly 2; the first protrusion 311 has a recessed portion 3112a, and the recessed portion 3112a penetrates the first surface 3111 along the thickness direction X; the protrusion 323a extends to the recessed portion 3112a along the thickness direction X, and a fifth gap 500 is provided between the protrusion 323a and the inner wall of the recessed portion 3112a, and the first insulating member 33 fills the fifth gap 500 and is respectively connected to the inner walls of the protrusion 323a and the recessed portion 3112a.

[0057] It can be understood that the protrusion 323a is provided on the pole 32, and the recessed portion 3112a is provided at the position of the first protrusion 311 corresponding to the protrusion 323a. Through the combination of the protrusion 323a and the recessed portion 3112a, the positioning and sealing effect of the pole 32 can be better achieved. Fig. 9The top cover sheet 31 has a fourth surface 312 away from the electrode assembly 2 in the thickness direction X, and the first surface 3111 and the fourth surface 312 are flush. When the first surface 3111 and the fourth surface 312 are flush, the structural stability of the entire top cover structure can be further ensured; see further Figure 8 The protrusion 323a has a fifth surface 3231 away from the second protrusion 322 in the radial direction Y, the second protrusion 322 has a sixth surface 3222 away from the pole body 321 in the radial direction Y, and the fifth surface 3231 and the sixth surface 3222 are coplanarly arranged in the thickness direction X. The coplanar arrangement of the fifth surface 3231 and the sixth surface 3222 means that the two surfaces are in the same plane in the thickness direction X, which can improve the structural stability of the pole 32.

[0058] In some embodiments, see Fig.10 The second protrusion 322 has a second surface 3221 facing the first protrusion 311, and the first protrusion 311 has a first surface 3111 facing the second protrusion 322; the top cover assembly 3 also includes a protrusion 323b, which is connected to the first surface 3111 and protrudes from the first protrusion 311 in a direction away from the electrode assembly 2; the second protrusion 322 also has a recessed portion 3112b, which penetrates the second surface 3221 along the thickness direction X; the protrusion 323b extends to the recessed portion 3112b along the thickness direction X, and there is a fifth gap 500 between the protrusion 323b and the inner wall of the recessed portion 3112b, and the first insulating member 33 fills the fifth gap 500 and is respectively connected to the inner walls of the protrusion 323b and the recessed portion 3112b. It can be understood that, Fig.10 The structure and Fig. 9 The structure is similar to Fig.10 The positions of the protrusions and depressions in Fig. 9 Quite the opposite, but Fig.10 The structure can also achieve better positioning and sealing effects of the pole 32 by combining the protruding portion 323b and the recessed portion 3112b.

[0059] Example 4

[0060] See also Figure 1 , Fig.11 and Fig.12, a secondary battery is provided, the structure of which is the same as that of embodiment 1, except that: a bracket 34 is arranged on the side of the top cover sheet 31 away from the electrode assembly 2, and the second protrusion 322 has a second surface 3221 facing the first protrusion 311, and the first protrusion 311 has a first surface 3111 facing the second protrusion 322; the pole 32 also includes a protrusion 323a, the protrusion 323a is connected to the second surface 3221 and protrudes from the second protrusion 322 in a direction close to the electrode assembly 2; the first protrusion 311 has a recessed portion 3112a, and the recessed portion 3112a passes through the first surface 3111 along the thickness direction X; the protrusion 323a extends to the recessed portion 3112a along the thickness direction X, and a fifth gap 500 is provided between the protrusion 323a and the inner wall of the recessed portion 3112a, and the first insulating member 33 fills the fifth gap 500 and is respectively connected to the inner wall of the protrusion 323a and the recessed portion 3112a. It can be understood that Example 4 is a combination of the structures of Example 2 and Example 3. Through the structural combination, on the one hand, the insulation and sealing of the pole 32 can be further improved, and on the other hand, the positioning effect of the pole 32 can be improved and the structural stability can be ensured.

[0061] See also Fig.12 The pole 32 also includes a connecting portion 324, which is located in the accommodating cavity 11 and connected to the side of the pole body 321 facing the electrode assembly 2, and a sixth gap 600 is provided between the connecting portion 324 and the top cover sheet 31 in the thickness direction X; the top cover assembly 3 also includes: a second insulating member 35 and a sealing member 36, the second insulating member 35 is arranged on the side of the top cover sheet 31 close to the electrode assembly 2; the second insulating member 35 surrounds the outer periphery of the pole 32 and is connected to the pole 32, and a portion of the second insulating member 35 is filled in the sixth gap 600 and is respectively connected to the top cover sheet 31 and the connecting portion 324; the sealing member 36 surrounds the outer periphery of the pole body 321 and abuts against the pole body 321; a portion of the sealing member 36 is filled in the sixth gap 600 and abuts against any one of the connecting portion 324, the second insulating member 35, and the top cover sheet 31; a portion of the sealing member 36 extends to the mounting hole 310 and abuts against the hole wall of the mounting hole 310 and any one of the first insulating member 33.

[0062] It can be understood that, by setting the second insulating member 35 and the sealing member 36 in the top cover assembly 3, the sealing between the pole 32 and the connecting portion 324 and the top cover sheet 31 can be improved; the second insulating member 35 is filled in the sixth gap 600 and connected to the top cover sheet 31 and the connecting portion 324, while the sealing member 36 abuts against the pole body 321, thereby reducing the risk of gas or liquid leakage. By setting the connecting portion 324 and the sixth gap 600, the structural strength between the pole 32 and the top cover sheet 31 can be increased. The sixth gap 600 is filled with the second insulating member 35 and the sealing member 36, so that the sealing and insulation between the connecting portion 324 and the top cover sheet 31 are improved. The sealing member 36 extends to the mounting hole 310 and abuts against the hole wall of the mounting hole 310 and the first insulating member 33, which can enhance the sealing and stability of the pole 32.

[0063] In some embodiments, the connection portion 324 can be an integrated structure with the pole body 321, and the connection portion 324 can be set to a circular or rectangular shape according to requirements. The connection portion 324 can be used for welding and conducting with the connecting piece or the pole ear, and the pole body 321 is used to connect with external busbars and other structures.

[0064] In some embodiments, the first insulating member 33 can be used as the upper plastic of the secondary battery, and the second insulating member 35 can be used as the lower plastic of the secondary battery. The material of the first insulating member 33 and the second insulating member 35 can be polyurethane, thermoplastic elastomer, etc.

[0065] In some embodiments, the present application also provides an electrical device, which includes the secondary battery provided in this embodiment. Among them, the electrical device can be an application device such as a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool. The vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical devices.

[0066] The battery pack and electrical device provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A secondary battery, characterized in that: include: A housing having a receiving cavity; An electrode assembly, wherein the electrode assembly is disposed in the accommodating cavity; A top cover assembly, the top cover assembly comprising: A top cover sheet, the top cover sheet is connected to the shell and covers the accommodating cavity, the top cover sheet is provided with a mounting hole, the top cover sheet has a thickness direction, the mounting hole penetrates the top cover sheet along the thickness direction, the mounting hole has a radial direction perpendicular to the thickness direction, a hole wall of the mounting hole is provided with a first protrusion, and the first protrusion extends along the radial direction toward the central axis of the mounting hole; A pole, the pole comprising a pole body and a second protrusion arranged on the pole body; the pole body is passed through the mounting hole; the second protrusion is located outside the accommodating cavity, and at least a portion of the second protrusion is arranged toward the first protrusion in the thickness direction, and a first gap is formed between the first protrusion and the second protrusion in the thickness direction; A first insulating member, the first insulating member is arranged on a side of the top cover sheet away from the electrode assembly; the first insulating member surrounds the outer circumference of the pole and is respectively connected to the pole and the top cover sheet; the first insulating member at least partially fills the first gap, and a portion of the first insulating member extends to the mounting hole and is respectively connected to the pole body and the hole wall of the mounting hole.

2. The secondary battery according to claim 1, characterized in that: A second gap is provided between the pole body and the first protrusion in the radial direction, the second gap is communicated with the first gap, and a portion of the first insulating member extends to the second gap and is respectively connected to the pole body and the first protrusion; A third gap is provided between the pole body and the hole wall of the mounting hole in the radial direction, the third gap is communicated with the second gap, and a portion of the first insulating member extends to the third gap and is respectively connected to the pole body and the hole wall of the mounting hole.

3. The secondary battery according to claim 2, characterized in that: There are a plurality of the first protrusions, and the plurality of the first protrusions are arranged at intervals along the circumferential direction of the hole wall of the mounting hole, and the third gap is formed between two adjacent first protrusions.

4. The secondary battery according to claim 1, characterized in that: The top cover assembly also includes: A bracket, the bracket comprising an extension portion and a limiting portion, the extension portion is arranged on a side of the top cover sheet away from the electrode assembly and is arranged around the mounting hole, the extension portion protrudes from the top cover sheet toward the side away from the electrode assembly; the limiting portion is connected to an end of the extension portion away from the top cover sheet and extends along the radial direction toward the central axis of the mounting hole, and at least a portion of the second protrusion is arranged toward the extension portion in the thickness direction; The bracket and the top cover sheet jointly define a mounting groove, part of the pole is located in the mounting groove, a fourth gap is provided between the pole and the bracket, part of the first insulating member fills the fourth gap and is respectively connected to the bracket and the pole.

5. The secondary battery according to claim 1 or 4, characterized in that: The second protrusion has a second surface facing the first protrusion, and the first protrusion has a first surface facing the second protrusion; The pole also includes a protrusion, which is connected to the second surface and protrudes from the second protrusion in a direction close to the electrode assembly; the first protrusion has a recessed portion, which penetrates the first surface along the thickness direction; the protrusion extends to the recessed portion along the thickness direction, and there is a fifth gap between the protrusion and the inner wall of the recessed portion, and the first insulating member fills the fifth gap and is respectively connected to the inner walls of the protrusion and the recessed portion.

6. The secondary battery according to claim 1 or 4, characterized in that: The second protrusion has a second surface facing the first protrusion, and the first protrusion has a first surface facing the second protrusion; The top cover assembly further includes a protrusion, the protrusion being connected to the first surface and protruding from the first protrusion in a direction away from the electrode assembly; The second protrusion also has a recessed portion, which penetrates the second surface along the thickness direction; the protruding portion extends to the recessed portion along the thickness direction, and a fifth gap is provided between the protruding portion and the inner wall of the recessed portion, and the first insulating member is filled in the fifth gap and is respectively connected to the protruding portion and the inner wall of the recessed portion.

7. The secondary battery according to claim 5, characterized in that: The top cover sheet has a fourth surface in the thickness direction that is away from the electrode assembly, and the first surface is flush with the fourth surface.

8. The secondary battery according to claim 5, characterized in that: The protrusion a has a fifth surface away from the second protrusion in the radial direction, the second protrusion has a sixth surface away from the pole body in the radial direction, and the fifth surface and the sixth surface are coplanarly arranged in the thickness direction.

9. The secondary battery according to claim 1, characterized in that: The pole further comprises a connecting portion, the connecting portion is located in the accommodating cavity and connected to a side of the pole body facing the electrode assembly, and a sixth gap is formed between the connecting portion and the top cover sheet in the thickness direction; The top cover assembly also includes: a second insulating member, the second insulating member being arranged on a side of the top cover sheet close to the electrode assembly; the second insulating member surrounds the outer circumference of the pole and is connected to the pole, a portion of the second insulating member fills the sixth gap and is respectively connected to the top cover sheet and the connecting portion; A seal, the seal surrounds the outer circumference of the pole body and abuts against the pole body; a portion of the seal fills the sixth gap and abuts against any one of the connecting portion, the second insulating member, and the top cover sheet; a portion of the seal extends to the mounting hole and abuts against the hole wall of the mounting hole and any one of the first insulating member.

10. An electrical device, characterized in that: The secondary battery comprises the secondary battery according to any one of claims 1 to 9, wherein the secondary battery is used to supply power to the electrical device.

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