A battery top cover assembly with welded pole riveted installation

Abstract

The present invention discloses a battery top cover assembly with a welded pole riveted installation, comprising a top cover plate, with mounting holes provided at both ends in the length direction of the top cover plate, and a pole structure assembled on each mounting hole through a pressure ring, an upper insulating member, a sealing ring and a lower insulating member, the pole structure in one mounting hole comprising a copper part and an aluminum part, and the aluminum part is welded and fixed to the top of the copper part; the pole structure in the other mounting hole is an aluminum pole; the production quality and pass rate of the battery top cover assembly are improved, and the copper part and the aluminum part in one pole structure are fixed by ultrasonic or laser welding to ensure a firm connection, while the production cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of a battery top cover for a battery shell of a new energy vehicle, in particular to a battery top cover assembly with a welded pole riveted and installed. Background Art

[0002] The battery top cover assembly is an important component of the battery shell of new energy vehicles. It is generally composed of a top cover plate, a positive column and a negative column. The positive column is made of aluminum, and the negative column is made of a combination of copper and aluminum. During assembly, the positive column and the negative column are respectively fitted into the two mounting holes of the top cover plate through insulating parts, and then the positive column and the negative column are fixed to the top cover plate by laser welding using auxiliary mounting parts. However, the battery top cover assembly assembled in this way has the following defects:

[0003] 1. Laser welding between the auxiliary mounting parts and the top cover plate generates high heat, which in turn causes the top cover plate to deform, resulting in excessive warping of the top cover plate, resulting in a high failure rate of the battery top cover assembly after welding.

[0004] 2. The positive electrode is formed into a copper-aluminum pole by batch punching from a copper-aluminum composite strip in a stamping machine. However, this method produces a lot of waste when forming the copper-aluminum pole, resulting in low raw material utilization and large material waste. In addition, the procurement cost of the copper-aluminum composite strip is high, thereby increasing production costs.

[0005] Therefore, based on the above defects, there is an urgent need for a battery top cover assembly that can solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies of the above-mentioned technology and to provide a battery top cover assembly with welded poles and riveted installation.

[0007] The present invention provides a battery top cover assembly with a welded pole riveted installation, comprising:

[0008] A top cover plate, with mounting holes provided at both ends of the top cover plate in the length direction;

[0009] Two pole structures, each comprising a pole portion adapted to the mounting hole and a pole convex ring arranged around the outer periphery of the pole portion, wherein the pole portion is provided with a conductive protrusion and riveted portions arranged at intervals or continuously;

[0010] A pressure ring located above each mounting hole, each of the pressure rings being provided with a central hole adapted to the pole portion;

[0011] A sealing ring located below each mounting hole and fitted against the lower surface of the top cover;

[0012] An upper insulating member is provided above each mounting hole and in contact with the upper surface of the top cover plate, and each upper insulating member is provided with a first through hole corresponding to the position of the corresponding mounting hole;

[0013] Among them, each pole structure moves from bottom to top, so that after the pole part passes through the sealing ring, mounting hole, first through hole and center hole at the corresponding position in sequence, the pole convex ring contacts the sealing ring and the lower insulating member; the pressure ring is fitted on the upper surface of the upper insulating member so that the riveted part is arranged adjacent to the center hole; after the riveted part is riveted, a first riveted protrusion is formed on the outer periphery of the pole part, and the first riveted protrusion is pressed on the step on the upper surface of the pressure ring or the inner wall of the center hole or the chamfered surface of the inner wall of the center hole, so that the pole structure, pressure ring, sealing ring, upper insulating member and lower insulating member are all assembled and fixed on the top cover plate; the pole part of one pole structure includes a copper part and an aluminum part, the aluminum part is welded and fixed to the top of the copper part, a conductive protrusion is formed on the aluminum part, and a pole convex ring and a riveted part are formed on the copper part; the other pole structure is an aluminum pole.

[0014] According to the battery top cover assembly with welded pole rivet installation described above, the aluminum part is welded and fixed to the top of the copper part by laser welding or ultrasonic welding, and a welding interface layer is formed between the bottom of the aluminum part and the top of the copper part.

[0015] According to the battery top cover assembly with a welded pole riveted installation as described above, the welding interface layer formed during laser welding is an annular layer.

[0016] According to the battery top cover assembly with a welded pole riveted installation as described above, the riveted portion on the copper part is arranged at the top edge of the copper part, and the riveted portion on the aluminum pole is arranged at the top outer edge of the pole portion of the aluminum pole, and the end surface of the riveted portion is higher than the upper surface of the pressure ring.

[0017] According to the battery top cover assembly with a welded pole riveted installation as described above, a plurality of protrusions are provided on the copper part, and a plurality of rivet holes respectively adapted to each protrusion are provided on the connecting ring located on the outer periphery of the conductive protrusion on the aluminum part, and each protrusion is riveted and fixed to the corresponding rivet hole.

[0018] According to the battery top cover assembly with a welded pole riveted installation as described above, the end surface of the protruding column is higher than the upper surface of the connecting ring located on the outer periphery of the conductive protrusion on the aluminum part, and the top of each protruding column is riveted so that a second riveted protrusion is formed on the outer periphery of each protruding column, and the second riveted protrusion is pressed on the step in the riveted hole or the chamfered surface in the riveted hole or the upper surface of the connecting ring on the outer periphery of the conductive protrusion, or

[0019] The end face of the boss is lower than or flush with the upper surface of the connecting ring located on the outer periphery of the guide boss on the aluminum part, and the top of each boss is riveted so that a second riveted protrusion is formed on the outer periphery of each boss, and the second riveted protrusion is pressed on the step in the rivet hole or the chamfered surface in the rivet hole.

[0020] According to the battery top cover assembly with a welded pole riveted installation as described above, an annular rib arranged around the mounting hole is formed on the upper surface of the top cover plate in the area located at the mounting hole, and a positioning space is formed between the inner wall of the annular rib and the upper surface of the top cover plate in the area located at the mounting hole. The upper insulating member is positioned in the positioning space, and the outer periphery of the upper insulating member abuts against the inner wall of the annular rib.

[0021] According to the battery top cover assembly with a welded pole riveted installation as described above, a first annular convex strip is formed on the outer edge of the upper surface of the upper insulating member, and the outer peripheral wall of the pressure ring abuts against the inner wall of the first annular convex strip.

[0022] According to the battery top cover assembly with a welded pole riveted installation as described above, a second annular ridge is formed on the inner edge of the lower surface of the upper insulating member, and the second annular ridge is embedded between the inner wall of the mounting hole and the outer wall of the pole portion, and the outer wall and inner wall of the second annular ridge respectively conflict with the inner wall of the mounting hole and the outer wall of the pole portion.

[0023] According to the above-mentioned battery top cover assembly with a welded pole riveted installation, it also includes a lower insulating member fitted on the lower surface of the top cover plate, and two second through holes are provided on the lower insulating member, respectively corresponding to the positions of the mounting holes, and each sealing ring is respectively located in the two second through holes; a recessed groove is formed on the lower surface of the area of ​​the top cover plate located at each mounting hole, and an insulating convex ring is formed on the upper edge of each second through hole of the lower insulating member, which fits in the recessed groove, and the outer peripheral wall of the insulating convex ring contacts the inner peripheral wall of the recessed groove, and the inner peripheral wall of each second through hole of the lower insulating member is recessed to form an annular concave, and the outer peripheral part of the pole convex ring fits in the annular concave, and the insulating convex ring and the recess are square.

[0024] According to the above-mentioned battery top cover assembly with a welded pole riveted installation, connecting ears are formed on opposite sides of the outer periphery of the pole convex ring, and the upper surface of the connecting ears is lower than the upper surface of the pole convex ring. The lower surface of the lower insulating member is provided with a recessed portion corresponding to the position of each connecting ear, and each recessed portion is connected to the annular inner concave. The connecting ears are correspondingly immersed in the recessed portion, and the outer surface of the connecting ear is the pole ear welding area.

[0025] The battery top cover assembly with welded poles and riveted mounting described in the present invention has the following beneficial effects:

[0026] 1. The first riveted protrusion formed by the riveting portion on the pole structure is pressed on the pressure ring, and the pole protruding ring of the pole structure is buckled on the sealing ring and the lower insulating member to rivet the pole structure on the top cover plate. When the first riveted protrusion is formed, most of the riveting force acts on the pole structure, and the force on the top cover plate is small, thereby avoiding deformation of the top cover plate. This ensures that the quality of the battery top cover assembly after assembling the pole structure is higher, thereby improving the production qualification rate.

[0027] 2. An upper insulating member is provided between the pressure ring and the upper surface of the top cover plate, and a second annular convex strip is provided between the pole part and the mounting hole, so as to improve the insulation performance between the pole part and the top cover plate.

[0028] 3. The pole convex ring and the lower surface of the top cover plate are insulated by the sealing ring and the insulating convex ring, and the sealing ring also plays a sealing role, further improving the sealing of the battery top cover assembly.

[0029] 4. The annular rib can strengthen the strength of the top cover plate, so that the deformation of the top cover plate of the new energy vehicle battery equipped with the battery top cover assembly of the present invention is small after inflation, and at the same time, the upper insulating part is positioned.

[0030] 5. In the pole structure composed of copper and aluminum parts, the copper and aluminum parts are made of single-source copper plates and aluminum plates, respectively. The formed aluminum parts and the formed copper parts are then brought into surface-to-surface contact and fixed to each other by ultrasonic welding or laser welding. This formed pole structure reduces production costs, and the welding interface layer in the formed pole structure is greater than 0.1mm, meeting the strength requirements of the copper-aluminum pole composite connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of the battery top cover assembly.

[0032] Figure 2 It is a schematic diagram of the full cross-section structure of the battery top cover assembly.

[0033] Figure 3 Schematic diagram of the structure of the top cover (1).

[0034] Figure 4 Schematic diagram of the structure of the top cover (2).

[0035] Figure 5 An exploded view of the pole structure with copper and aluminum parts.

[0036] Figure 6 It is a schematic diagram of a pole structure with copper and aluminum parts.

[0037] Figure 7 This is a cross-sectional view of the pole structure formed by ultrasonic welding.

[0038] Figure 8 This is a schematic diagram of the back of the pole structure formed by ultrasonic welding.

[0039] Figure 9 This is a cross-sectional view of the pole structure formed by laser welding.

[0040] Figure 10 This is a schematic diagram of the back of the pole structure formed by laser welding.

[0041] Figure 11 It is a schematic diagram of the aluminum pole structure.

[0042] Figure 12 is a cross-sectional view of an aluminum pole.

[0043] Figure 13 It is a structural diagram of the pressure ring.

[0044] Figure 14 Schematic diagram of the structure of the upper insulating member (1).

[0045] Figure 15 Schematic diagram of the structure of the upper insulating member (2).

[0046] Figure 16 The diagram is a schematic diagram of a structure in which a pole structure is installed as a negative pole in a mounting hole.

[0047] Figure 17 This is an enlarged view of point A.

[0048] Figure 18 This is a structural diagram of another pole structure being installed as a positive pole into another mounting hole.

[0049] Figure 19 It is a structural schematic diagram of a convex column forming a second hinge portion and being riveted into a rivet hole.

[0050] Figure 20 This is an installation diagram of a pole structure with a connection ear.

[0051] Figure 21 Schematic diagram of the structure of the lower insulating member (1).

[0052] Figure 22 Schematic diagram of the structure of the lower insulating member (2).

[0053] Figure 23 It is a schematic diagram of the back structure of the battery top cover assembly.

[0054] Reference numerals: 1, top cover; 11, mounting hole; 12, annular rib; 13, sink; 14, cavity; 15, positioning space;

[0055] 2. Pole structure; 21. Pole portion; 211. Copper member; 212. Aluminum member; 213. Connecting ring; 22. Pole convex ring; 221. Connecting lug; 214. Riveted portion; 215. Riveted hole; 23. Boss; 232. Second riveted convex portion; 24. Conductive convex; 25. Welding interface layer;

[0056] 3. Press ring; 31. Center hole; 311. Chamfered surface;

[0057] 4. Upper insulating member; 41. First annular convex strip; 42. First through hole; 43. Second annular convex strip;

[0058] 5. Sealing ring; 6. Lower insulating member; 61. Insulating protruding ring; 62. Second through hole; 63. Annular concave; 64. Recessed portion;

[0059] 7. Avoid gaps. DETAILED DESCRIPTION

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0061] Example:

[0062] Figure 1-Figure 23 As shown, this embodiment describes a battery top cover assembly with welded poles and riveted mounting, comprising a top cover plate 1 with mounting holes 11 provided at both ends of the top cover plate 1 in the longitudinal direction. Each mounting hole 11 is assembled with a pole structure 2 via a pressure ring 3, an upper insulator 4, a sealing ring 5, and a lower insulator 6. The top cover plate 1 is made of aluminum and is generally rectangular in shape.

[0063] Specifically, each of the pole structures 2 includes a pole portion 21 adapted to the mounting hole 11, and a pole convex ring 22 arranged around the outer periphery of the pole portion 21. The pole portion 21 is provided with a guide protrusion 24 and a riveted portion 214 arranged at intervals or continuously. The continuously arranged riveted portion 214 is arranged in an annular structure, and the interval-arranged riveted portion 214 is a plurality of riveted portions 214 spaced from each other and arranged in an annular structure.

[0064] Each pressure ring 3 is located above each mounting hole 11 , and each pressure ring 3 is provided with a center hole 31 adapted to the pole portion 21 ; the pressure ring 3 is a sheet-type structure and is made of aluminum, and the upper end edge of the center hole 31 is adapted to the riveted portion 214 .

[0065] Each sealing ring 5 is located below each mounting hole 11 and is fitted against the lower surface of the top cover plate 1 . The sealing ring 5 is generally made of rubber and serves to seal the pole structure 2 after installation.

[0066] Each upper insulating member 4 is located above each mounting hole 11 and is fitted with the upper surface of the top cover plate 1. Each upper insulating member 4 is provided with a first through hole 42 corresponding to the position of the corresponding mounting hole 11. The upper insulating member 4 is also a sheet-type structure and is made of plastic material. The setting of the upper insulating member 4 insulates the pressure ring 3 from the top cover plate 1.

[0067] The lower insulating member 6 is fitted on the lower surface of the top cover plate 1 to insulate the lower surface of the top cover plate 1. Two second through holes 62 corresponding to the positions of the mounting holes 11 are provided on the lower insulating member 6. Each sealing ring 5 is respectively located in the two second through holes 62. The lower insulating member 6 is made of plastic material.

[0068] When each pole structure 2 is assembled, each pole structure 2 moves from bottom to top, so that the pole part 21 passes through the sealing ring 5, the mounting hole 11, the first through hole 42 and the center hole 31 at the corresponding position in sequence, and the pole convex ring 22 contacts the sealing ring 5 and the lower insulating member 6; the pressure ring 3 is arranged on the upper surface of the upper insulating member 4 so that the rivet portion 214 is arranged adjacent to the center hole 31; the rivet portion 214 is deformed after riveting and forming a first riveted convex portion on the outer periphery of the pole part 21, and the first riveted convex portion is in an outward-turned state, and the first riveted convex portion is in an outward-turned state. The connecting protrusion is pressed onto the step on the upper surface of the pressure ring 3 or the inner wall of the center hole 31 or the chamfered surface 311 of the inner wall of the center hole 31, so that the pole structure 2, the pressure ring 3, the sealing ring 5, the upper insulating member 4 and the lower insulating member 6 are assembled and fixed on the top cover plate 1; the pole portion 21 of one pole structure 2 includes a copper part 211 and an aluminum part 212, the aluminum part 212 is welded and fixed to the top of the copper part 211, the conductive protrusion 24 is formed on the aluminum part 212, and the pole protrusion ring 22 and the riveted part 214 are integrally formed on the copper part 211; the other pole structure 2 is an aluminum pole.

[0069] Among them, when the pole structure 2 is assembled and fixed, the rivet part 214 is deformed by riveting, so that the pressure ring 3 and the pole structure 2 are restricted to each other, and the pressure ring 3 contacts the upper surface of the upper insulating part 4, and the pole convex ring 22 acts on the lower insulating part 6 and the sealing ring 5, so that the pole structure 2 is installed on the top cover plate 1 in an insulating and sealed state. Since the deformation of the rivet part 214 during riveting exerts a small force on the top cover plate 1, the top cover plate 1 is not easily deformed during riveting, thereby improving the production quality and pass rate of the battery top cover assembly.

[0070] Preferably, a cavity 14 is provided on the copper piece 211 , so that during welding, the welding head or welding energy can be transmitted through the cavity 14 for welding operation, thereby making welding between the copper piece 211 and the aluminum piece 212 more convenient.

[0071] In this embodiment, the aluminum member 212 is welded and fixed to the top of the copper member 211 using laser welding or ultrasonic welding, and a welding interface layer 25 is formed between the bottom of the aluminum member 212 and the top of the copper member 211. The welding interface layer 25 is formed due to the high temperature generated during ultrasonic welding or laser welding, which causes the aluminum and copper materials to melt and solidify. During ultrasonic welding or laser welding, energy is applied from the top surface of the cavity 14. Under the action of the welding energy, deep penetration welding is achieved, causing the copper material at the top of the cavity 14 to melt and solidify with the aluminum member 212, forming a welded copper-aluminum welding interface layer 25. The thickness of the welding interface layer 25 is greater than 0.1 mm.

[0072] Preferably, the welding interface layer 25 formed during laser welding is one or more annular layers. When multiple annular layers are formed, the multiple annular layers are distributed in the shape of annual rings.

[0073] In this embodiment, the riveted portion 214 on the copper part 211 is arranged at the top edge of the copper part 211, and the riveted portion 214 on the aluminum pole is arranged at the top outer edge of the pole part 21 of the aluminum pole. The end face of the riveted portion 214 is higher than the upper surface of the pressure ring 3. When the riveted portion 214 is riveted, the riveted portion 214 will be folded toward the outer shape to form a first riveted protrusion, so that the first riveted protrusion is pressed at the edge of the upper port of the center hole 31, wherein the top surface edge of the pole part 21 of the aluminum pole serves as the riveted portion 214 on the aluminum pole, and the riveted portion 214 on the copper part 211 is a protruding convex ring structure, which can be a continuous or intermittent structure.

[0074] In this embodiment, the copper component 211 is provided with a plurality of protrusions 23, and the connecting ring 213 on the aluminum component 212, which is located on the outer periphery of the guide protrusion 24, is provided with a plurality of rivet holes 215 respectively adapted to each protrusion 23, and each protrusion 23 is riveted to a corresponding rivet hole 215. The specific riveting structure between the protrusion 23 and the rivet hole 215 is as follows:

[0075] The end surface of the boss 23 is higher than the upper surface of the connecting ring 213 on the aluminum part 212 located on the outer periphery of the guide protrusion 24, and the top of each boss 23 is riveted so that a second riveted protrusion 232 is formed on the outer periphery of each boss 23, and the second riveted protrusion 232 is pressed on the step in the rivet hole 215 or the chamfered surface 311 in the rivet hole 215 or the upper surface of the connecting ring 213 on the outer periphery of the guide protrusion 24, or

[0076] The end surface of the boss 23 is lower than or flush with the upper surface of the connecting ring 213 located on the outer periphery of the guide boss 24 on the aluminum part 212, and the top of each boss 23 is riveted so that a second riveted protrusion 232 is formed on the outer periphery of each boss 23, and the second riveted protrusion 232 is pressed on the step in the rivet hole 215 or the chamfered surface 311 in the rivet hole 215.

[0077] In this embodiment, an annular rib 12 is formed on the upper surface of the top cover plate 1 in the area where the mounting hole 11 is located, and a positioning space 15 is formed between the inner wall of the annular rib 12 and the upper surface of the top cover plate 1 in the area where the mounting hole 11 is located. The upper insulating member 4 is positioned in the positioning space 15, and the outer periphery of the upper insulating member 4 contacts the inner wall of the annular rib 12; the annular rib 12 can strengthen the strength of the top cover plate 1, so that the new energy vehicle battery equipped with the battery top cover assembly of the present invention is less deformed after inflation, and at the same time, the upper insulating member 4 is positioned.

[0078] Preferably, a first annular ridge 41 is formed on the outer edge of the upper surface of the upper insulating member 4, and the outer peripheral wall of the pressure ring 3 abuts against the inner wall of the first annular ridge 41; wherein, the annular ridge 12, the upper insulating member 4 and the pressure ring 3 are all square in shape, thereby preventing the pole structure 2 assembled on the top cover plate 1 from rotating.

[0079] In this embodiment, a second annular ridge 43 is formed on the inner edge of the lower surface of the upper insulating member 4. The second annular ridge 43 is embedded between the inner wall of the mounting hole 11 and the outer wall of the pole part 21, and its outer wall and inner wall respectively conflict with the inner wall of the mounting hole 11 and the outer wall of the pole part 21; its structural arrangement mainly serves to reliably position the upper insulating member 4 between the mounting hole 11 and the annular rib 12, and the second annular ridge 43 serves to isolate and insulate between the inner wall of the mounting hole 11 and the outer wall of the pole part 21, and to improve the insulation performance between the pole structure 2 and the top cover plate 1.

[0080] Preferably, a recessed groove 13 is formed on the lower surface of the area of ​​each mounting hole 11 on the top cover plate 1, and an insulating protrusion ring 61 is formed on the upper edge of each second through hole 62 of the lower insulating member 6. The insulating protrusion ring 61 is fitted in the recessed groove 13, and the outer peripheral wall of the insulating protrusion ring 61 contacts the inner peripheral wall of the recessed groove 13. The inner peripheral wall of each second through hole 62 of the lower insulating member 6 is recessed with an annular recess 63, and the outer peripheral portion of the pole protrusion ring 22 is fitted in the annular recess 63. The insulating protrusion ring 61 and the recessed groove 13 are square. The structural arrangement makes the lower surface of the pole protrusion ring 22 flush with the lower surface of the lower insulating member 6, and the lower insulating member 6 can be stably positioned on the top cover plate 1.

[0081] Preferably, connecting ears 221 are formed on opposite sides of the outer periphery of the pole convex ring 22, and the upper surface of the connecting ears 221 is lower than the upper surface of the pole convex ring 22. The lower surface of the lower insulating member 6 is provided with a recessed portion 64 corresponding to the position of each connecting ear 221, and each recessed portion 64 is connected to the annular inner recess 63. The connecting ears 221 are correspondingly immersed in the recessed portion 64. The outer surface of the connecting ear 221 is the pole ear welding area, and there is an avoidance gap 7 between the upper surface of the connecting ear 221 and the upper inner wall of the recessed portion 64; wherein, the connecting ear 221, the pole convex ring 22 and the copper part 211 are combined with each other into an integrated structure. The integrated structure makes it easier to weld the battery cell pole ears, and the connecting ear 221 and the pole convex ring 22 on the copper part 211 are both made of copper, and the connecting ear 221 and the pole convex ring 22 on the aluminum pole are both made of aluminum.

[0082] Furthermore, the annular inner recess 63 and the recessed portion 64 on the lower insulating member 6 are combined to form a cross-shaped recess, the insulating protruding ring 61 is a cross-shaped protrusion corresponding to the cross-shaped recess, and the recessed groove 13 is a rectangular recessed groove 13 adapted to the cross-shaped protrusion.

[0083] Finally, the pole structure 2 with the copper part 211 and the aluminum part 212 on the top cover plate 1 serves as a negative pole, and the pole structure 2 with the aluminum pole serves as a positive pole.

Claims

1. A battery top cover assembly with a welded pole riveted installation, characterized in that: include: A top cover plate (1), wherein mounting holes (11) are provided at both ends of the top cover plate (1) in the longitudinal direction; Two pole structures (2), each of the pole structures (2) comprising a pole portion (21) adapted to the mounting hole (11), and a pole convex ring (22) arranged around the outer periphery of the pole portion (21), wherein the pole portion (21) is provided with a guide convex (24) and riveted portions (214) arranged at intervals or continuously; A pressure ring (3) located above each mounting hole (11), each of the pressure rings (3) being provided with a center hole (31) adapted to the pole portion (21); A sealing ring (5) is located below each mounting hole (11) and is arranged to fit the lower surface of the top cover plate (1); An upper insulating member (4) is provided above each mounting hole (11) and in contact with the upper surface of the top cover plate (1), and each upper insulating member (4) is provided with a first through hole (42) corresponding to the position of the corresponding mounting hole (11); Each pole structure (2) moves from bottom to top, so that the pole part (21) passes through the sealing ring (5), the mounting hole (11), the first through hole (42) and the center hole (31) at the corresponding position in sequence, and the pole convex ring (22) contacts the sealing ring (5) and the lower insulating member (6); the pressure ring (3) is arranged on the upper surface of the upper insulating member (4) so ​​that the riveted part (214) is arranged adjacent to the center hole (31); after the riveted part (214) is riveted, a first riveted convex part is formed on the outer periphery of the pole part (21), and the first riveted convex part is pressed on the upper surface or the center hole of the pressure ring (3). The step on the inner wall of (31) or the chamfered surface (311) of the inner wall of the center hole (31) is used to assemble and fix the pole structure (2), the pressure ring (3), the sealing ring (5), the upper insulating member (4) and the lower insulating member (6) on the top cover plate (1); the pole portion (21) of one pole structure (2) includes a copper member (211) and an aluminum member (212), the aluminum member (212) is welded and fixed to the top of the copper member (211), a conductive protrusion (24) is formed on the aluminum member (212), and a pole protrusion ring (22) and a riveted portion (214) are formed on the copper member (211); the other pole structure (2) is an aluminum pole; The aluminum part (212) is welded and fixed to the top of the copper part (211) by laser welding or ultrasonic welding, and a welding interface layer (25) is formed between the bottom of the aluminum part (212) and the top of the copper part (211); The copper part (211) is provided with a plurality of protrusions (23), and a connection ring (213) located on the outer periphery of the guide protrusion (24) on the aluminum part (212) is provided with a plurality of rivet holes (215) respectively adapted to the respective protrusions (23), and each protrusion (23) is riveted and fixed to a corresponding rivet hole (215).

2. A battery top cover assembly with welded poles and riveted mounting according to claim 1, characterized in that: The welding interface layer (25) formed during laser welding is an annular layer.

3. The battery top cover assembly with welded poles and riveted mounting according to claim 1, characterized in that: The riveted portion (214) on the copper piece (211) is arranged at the top edge of the copper piece (211), and the riveted portion (214) on the aluminum pole is arranged at the top outer edge of the pole portion (21) of the aluminum pole, and the end surface of the riveted portion (214) is higher than the upper surface of the pressure ring (3).

4. The battery top cover assembly with welded poles and riveted mounting according to claim 1, characterized in that: The end surface of the boss (23) is higher than the upper surface of the connecting ring (213) located on the outer periphery of the guide boss (24) on the aluminum part (212), and the top of each boss (23) is riveted so that a second riveted protrusion (232) is formed on the outer periphery of each boss (23), and the second riveted protrusion (232) is pressed on the step in the riveted hole (215) or the chamfered surface (311) in the riveted hole (215) or the upper surface of the connecting ring (213) on the outer periphery of the guide boss (24), or The end surface of the boss (23) is lower than or flush with the upper surface of the connecting ring (213) located on the outer periphery of the guide boss (24) on the aluminum part (212), and the top of each boss (23) is riveted so that a second riveted protrusion (232) is formed on the outer periphery of each boss (23), and the second riveted protrusion (232) is pressed on the step in the riveted hole (215) or the chamfered surface (311) in the riveted hole (215).

5. A battery top cover assembly with welded poles and riveted mounting according to claim 1 or 4, characterized in that: An annular convex rib (12) is formed on the upper surface of the region of the top cover plate (1) located in the mounting hole (11) and arranged around the mounting hole (11). A positioning space is formed between the inner wall of the annular convex rib (12) and the upper surface of the region of the top cover plate (1) located in the mounting hole (11). The upper insulating member (4) is positioned in the positioning space, and the outer periphery of the upper insulating member (4) contacts the inner wall of the annular convex rib (12).

6. A battery top cover assembly with welded poles and riveted mounting according to claim 5, characterized in that: A first annular convex strip (41) is formed on the outer edge of the upper surface of the upper insulating member (4), and the outer peripheral wall of the pressure ring (3) contacts the inner wall of the first annular convex strip (41).

7. A battery top cover assembly with welded poles and riveted mounting according to claim 6, characterized in that: A second annular ridge (43) is formed on the inner edge of the lower surface of the upper insulating member (4), and the second annular ridge (43) is embedded between the inner wall of the mounting hole (11) and the outer wall of the pole portion (21), and the outer wall and inner wall of the second annular ridge (43) respectively contact the inner wall of the mounting hole (11) and the outer wall of the pole portion (21).

8. The battery top cover assembly with welded poles and riveted mounting according to claim 7, characterized in that: It also includes a lower insulating member (6) that is fitted on the lower surface of the top cover plate (1), the lower insulating member (6) being provided with two second through holes (62) that respectively correspond to the positions of the mounting holes (11), and each sealing ring (5) is respectively located in the two second through holes (62); A recessed groove (13) is formed on the lower surface of the region of each mounting hole (11) on the top cover plate (1), an insulating convex ring (61) is formed on the upper edge of each second through hole (62) of the lower insulating member (6), the insulating convex ring (61) is fitted in the recessed groove (13), and the outer peripheral wall of the insulating convex ring (61) contacts the inner peripheral wall of the recessed groove (13), an annular recess (63) is formed on the inner peripheral wall of each second through hole (62) of the lower insulating member (6), the outer peripheral portion of the pole convex ring (22) is fitted in the annular recess (63), and the insulating convex ring (61) and the recessed groove (13) are arranged in a square shape.

9. A battery top cover assembly with welded poles and riveted mounting according to claim 8, characterized in that: Connecting ears (221) are formed on opposite sides of the outer periphery of the pole convex ring (22), and the upper surface of the connecting ears (221) is lower than the upper surface of the pole convex ring (22). The lower surface of the lower insulating member (6) is provided with a recessed portion (64) corresponding to the position of each connecting ear (221), and each recessed portion (64) is connected to the annular inner concave (63). The connecting ears (221) are correspondingly sunken into the recessed portion (64), and the outer surface of the connecting ear (221) is a pole ear welding area.

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