A battery top cover assembly with welded poles

Abstract

The present invention discloses a battery top cover assembly with a welded pole, comprising a top cover plate, two pole structures, two caps, two sealing rings, two upper insulating members and a lower insulating member, wherein mounting holes are provided at both ends in the length direction of the top cover plate; a pole structure is mounted in each mounting hole through the cap, the sealing ring, the upper insulating member and the lower insulating member, the pole portion of the pole structure in one mounting hole comprises a copper member and an aluminum member, the aluminum member is welded and fixed to the top of the copper member, a conductive protrusion is formed on the top of the aluminum member, a plurality of protrusions are formed on the top of the copper member, and all of them extend after penetrating a connecting ring on the aluminum member located on the outer periphery of the conductive protrusion, and the pole protrusion ring is formed on the outer periphery of the copper member; the pole structure in the other mounting hole is an aluminum pole; the production quality and the qualified rate of the battery top cover assembly are improved, and the copper member and the aluminum member 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 new energy vehicle battery shell, in particular to a battery top cover assembly with a welded pole. 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.

[0007] The present invention provides a battery top cover assembly with a welded terminal, 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 of which includes a pole portion adapted to the mounting hole and a pole convex ring arranged around the outer periphery of the pole portion, and the top of the pole portion has a conductive protrusion and a plurality of protrusions;

[0010] A cap located above each mounting hole, each cap being provided with a central hole adapted to the guide protrusion, rivet holes adapted to the respective protrusions, and a pressing portion located on the periphery of the area having the central hole and the rivet holes;

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

[0012] An upper insulating member located above each mounting hole and fitted to the upper surface of the top cover plate, each upper insulating member being 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, the mounting hole and the first through hole in sequence, the pole convex ring contacts the sealing ring; the cap covers at least part of the connecting ring and at least part of the upper insulating member, and each protrusion passes through the corresponding riveted hole; after the top of each protrusion is riveted, a riveted protrusion is formed on the outer periphery of the top of each protrusion, and the riveted protrusion is pressed on the edge of the upper port of the riveted hole, so that the pole structure, cap, sealing ring and upper insulating member are all assembled and fixed on the top cover plate; the pole part of the pole structure in one mounting hole includes a copper part and an aluminum part, the aluminum part is welded and fixed to the top of the copper part, the conductive protrusion is formed on the top of the aluminum part, multiple protrusions are formed on the top of the copper part, and all pass through the connecting ring on the aluminum part located on the outer periphery of the conductive protrusion and are in an extended state, and the pole convex ring is formed on the outer periphery of the copper part; the pole structure in the other mounting hole is an aluminum pole.

[0014] According to the battery top cover assembly with a welded electrode as described above, it is characterized in that 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 welded poles described above, the welding interface layer formed during laser welding is at least one annular layer.

[0016] According to the battery top cover assembly with a welded pole described above, the cap includes a cap body, a pressing portion is a pressing ring piece arranged around the periphery of the cap body, the center hole and the rivet hole are both arranged on the cap body, the annular surface arranged around the conductive protrusion on the pole portion is higher than the top surface of the upper insulating member, the cap body cover is arranged on the top of the pole portion and covers the annular surface of the pole portion, and the pressing ring piece contacts the annular surface arranged around the conductive protrusion on the pole portion.

[0017] According to the battery top cover assembly with a welded terminal described above, the upper port edge of each rivet hole is recessed to form a continuously arranged annular recess, the inner diameter of the annular recess is larger than the inner diameter of the rivet hole, and the rivet protrusion is sunken into the annular recess, so that a step portion is formed between the annular recess and the rivet hole.

[0018] According to the battery top cover assembly with a welded terminal 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.

[0019] According to the battery top cover assembly with welded poles 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 pressed ring sheet abuts against the inner wall of the first annular convex strip.

[0020] According to the battery top cover assembly with a welded pole 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.

[0021] According to the above-described battery top cover assembly with a welded terminal, 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.

[0022] According to the battery top cover assembly with a welded pole described above, a recessed groove is formed on the lower surface of the area of ​​each mounting hole on the top cover plate, an insulating convex ring is formed on the upper edge of each second through hole of the lower insulating member, the insulating convex ring fits in the recessed groove, and the outer peripheral wall of the insulating convex ring contacts the inner peripheral wall of the recessed groove, the inner peripheral wall of the second through hole of the lower insulating member is recessed to form an annular recess, and the outer peripheral portion of the pole convex ring fits in the annular recess; the annular recess and the pole convex ring are both square in shape, and the insulating convex ring and the recessed groove are also square in shape.

[0023] The battery top cover assembly with welded terminals described in the present invention has the following beneficial effects:

[0024] 1. The pole convex ring of the pole structure is buckled on the lower insulating part, and then the convex column on the pole structure is riveted to the rivet hole of the cap, and the cap is pressed against the upper insulating part, so that the pole structure is assembled on the top cover plate. This assembly method rivets the convex column so that the riveted convex part formed by riveting is limited to the upper edge of the rivet hole, so that the riveting only acts on the cap and the convex column during riveting, and the force acting on the top cover is small, which avoids deformation of the top cover plate, so that the quality of the battery top cover assembly after assembling the pole structure is higher, and the production qualification rate is improved.

[0025] 2. The upper insulating member is used to seal between the pressed ring sheet and the upper surface of the top cover plate, and the second annular convex strip is used to seal between the pole part and the mounting hole, thereby improving the sealing performance of the upper side of the battery top cover assembly.

[0026] 3. The pole convex ring and the lower surface of the top cover plate are insulated by a sealing ring and an insulating convex ring, and the sealing ring also plays a sealing role, further improving the sealing of the battery top cover assembly.

[0027] 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.

[0028] 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

[0029] Figure 1 It is a schematic diagram of the full cross-section structure of the battery top cover assembly.

[0030] Figure 2 It is a structural diagram of the battery top cover assembly.

[0031] Figure 3 It is a schematic diagram of the back structure of the battery top cover assembly.

[0032] Figure 4 It is a structural diagram of a pole structure formed by welding and assembled in a mounting hole of a top cover plate.

[0033] Figure 5 This is an enlarged view of point A.

[0034] Figure 6 It is a three-dimensional view of the pole structure formed by welding.

[0035] Figure 7 This is a cross-sectional view of the pole structure formed by ultrasonic welding.

[0036] Figure 8 This is a schematic diagram of the back of the pole structure formed by ultrasonic welding.

[0037] Figure 9 This is a cross-sectional view of the pole structure formed by laser welding.

[0038] Figure 10 This is a schematic diagram of the back of the pole structure formed by laser welding.

[0039] Figure 11 This is an exploded view of the pole structure formed by laser welding.

[0040] Figure 12 It is a structural diagram of the aluminum pole assembled in another mounting hole of the top cover plate.

[0041] Figure 13 It is a structural diagram of the aluminum pole.

[0042] Figure 14 is a cross-sectional view of an aluminum pole.

[0043] Figure 15 It is a structural diagram of riveted protrusion forming.

[0044] Figure 16 This is a schematic diagram of the structure of the upper insulation part Figure 1 .

[0045] Figure 17 This is a schematic diagram of the structure of the upper insulation part Figure 2 .

[0046] Figure 18 This is the structural diagram of the lower insulation Figure 1 .

[0047] Figure 19 This is the structural diagram of the lower insulation Figure 2 .

[0048] Figure 20 This is the structural diagram of the top cover Figure 1 .

[0049] Figure 21 This is the structural diagram of the top cover Figure 2 .

[0050] Reference numerals: 1, top cover; 11, mounting hole; 12, annular rib; 13, sink; 14, cavity; 15, positioning space;

[0051] 2. Pole structure; 21. Pole portion; 211. Copper component; 212. Aluminum component; 213. Connecting ring; 214. Annular surface; 22. Pole convex ring; 23. Boss; 231. Inner chamfer; 232. Riveted convex portion; 24. Conductive convex portion; 25. Welding interface layer;

[0052] 3. Cap; 31. Cap body; 310. Center hole; 311. Rivet hole; 312. Annular recess; 313. External chamfer; 314. Step portion; 32. Pressing portion;

[0053] 4. Upper insulating member; 41. First annular convex strip; 42. First through hole; 43. Second annular convex strip;

[0054] 5. Sealing ring; 6. Lower insulating member; 61. Insulating convex ring; 62. Second through hole; 63. Annular concave. DETAILED DESCRIPTION

[0055] 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.

[0056] Example:

[0057] Figures 1-21 As shown, the battery top cover assembly with a welded pole described in this embodiment includes a top cover plate 1, two pole structures 2, two caps 3, two sealing rings 5, two upper insulating members 4 and one lower insulating member 6. The top cover plate 1 is an aluminum plate, the two caps 3 are also made of aluminum, the two sealing rings 5 ​​are made of rubber, and the two upper insulating members 4 and one lower insulating member 6 are made of plastic.

[0058] The top cover plate 1 is provided with mounting holes 11 at both ends in the longitudinal direction; 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, and the top of the pole portion 21 has a guide protrusion 24 and a plurality of protrusions 23; two caps 3 are respectively located above each mounting hole 11, and each of the caps 3 is provided with a center hole 310 adapted to the guide protrusion 24, a rivet hole 311 adapted to each protrusion 23, and a pressing portion 32 located on the periphery of the area with the center hole 310 and the rivet hole 311; two sealing rings 5 ​​are respectively located at each mounting hole 11 Below, each sealing ring 5 is fitted with the lower surface of the top cover plate 1, and the sealing ring 5 is coaxially arranged with the mounting hole 11; the two upper insulating members 4 are respectively located above each mounting hole 11, and each upper insulating member 4 is fitted 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; the lower insulating member 6 is fitted with the lower surface of the top cover plate 1, and the lower insulating member 6 is provided with two second through holes 62 corresponding to the positions of the mounting holes 11, and each sealing ring 5 is respectively located in the two second through holes 62.

[0059] When assembling each pole structure 2, each pole structure 2 is moved from bottom to top, so that the pole part 21 passes through the sealing ring 5, the mounting hole 11 and the first through hole 42 in sequence, and the pole convex ring 22 contacts the sealing ring 5 and the lower insulating member 6; the cap 3 covers at least part of the connecting ring 213 and at least part of the upper insulating member 4, and each protrusion 23 passes through the corresponding rivet hole 311; after the top of each protrusion 23 is riveted, a rivet protrusion 232 is formed on the outer periphery of the top of each protrusion 23, and the rivet protrusion 232 is pressed on the upper port edge of the rivet hole 311, so that the pole structure 2, the cap 3, the sealing ring 5, the upper insulating member 4 and the lower insulating member 6 are all assembled and fixed on the top cover plate 1; the pole part 21 of the pole structure 2 in a mounting hole 11 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, and the guide protrusion 24 is formed on the aluminum part At the top of 212, multiple protrusions 23 are formed on the top of the copper part 211, and all penetrate the connecting ring 213 located on the outer periphery of the guide protrusion 24 on the aluminum part 212 and are in an extended state. The pole protrusion ring 22 is formed on the outer periphery of the copper part 211, and the pole protrusion ring 22 and the copper part 211 are combined with each other to form an integrated copper material structure; the pole structure 2 in the other mounting hole 11 is an aluminum pole; when the pole structure 2 is assembled and fixed, the protrusion 23 is riveted and deformed, so that the cap 3 and the pole structure 2 are fixed to each other, and the pressing part 32 of the cap 3 contacts the upper insulating part 4, and the pole protrusion 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 insulated and sealed state. Since the riveting protrusion 23 has 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 qualified rate of the battery top cover assembly.

[0060] Preferably, a cavity 14 is provided on the copper piece 211 , so that during welding, the welding head or welding energy can pass through the cavity 14 to perform the welding operation, making welding more convenient.

[0061] 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 material at the bottom of 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.

[0062] Preferably, the welding interface layer 25 formed during laser welding is an annular layer. There may be multiple or one annular layers, and the multiple annular layers are distributed in the shape of annual rings.

[0063] In this embodiment, the overall shape of the cap 3 is a square structure, and the cap 3 includes a cap body 31. The pressing portion 32 is a pressing ring piece arranged around the outer periphery of the cap body 31. The center hole 310 and the rivet hole 311 are both arranged on the cap body 31. The annular surface 214 arranged around the conductive protrusion 24 on the pole part 21 is higher than the top surface of the upper insulating member 4. The cap body 31 is arranged on the top of the pole part 21 and covers the annular surface 214 of the pole part 21. The pressing ring piece contacts the annular surface 214 arranged around the conductive protrusion 24 on the pole part 21; wherein, the setting of the cap body 31 can position the pole structure 2, so that the pole structure 2 is more stable after assembly.

[0064] Preferably, the upper end edge of each of the rivet holes 311 is recessed to form a continuously arranged annular recess 312, the inner diameter of the annular recess 312 is larger than the inner diameter of the rivet hole 311, and the rivet protrusion 232 is sunken into the annular recess 312; wherein, the annular recess 312 is provided to accommodate the rivet protrusion 232, to prevent the rivet protrusion 232 from being formed and excessively protruding from the top surface of the cap body 31.

[0065] Further preferably, an outer chamfer 313 is formed on the edge of the step portion 314 formed between the annular recess 312 and the rivet hole 311, and an inner chamfer 231 adapted to the outer chamfer 313 is formed between the riveted protrusion 232 and the boss 23, and the inner chamfer 231 is tightly arranged to the outer chamfer 313. The setting of the outer chamfer 313 makes it easier to form the riveted protrusion 232 after the boss 23 is riveted.

[0066] 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.

[0067] Preferably, the outer edge of the upper surface of the upper insulating member 4 has a first annular ridge 41, and the outer peripheral wall of the pressed ring sheet abuts against the inner wall of the first annular ridge 41; wherein, the annular rib 12, the upper insulating member 4 and the pressed ring sheet are all square in shape, thereby preventing the pole structure 2 assembled on the top cover plate 1 from rotating.

[0068] 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 portion 21, and the inner wall and outer 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. 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 seal the inner wall of the mounting hole 11 and the outer wall of the pole portion 21.

[0069] In this embodiment, a recessed groove 13 is formed on the lower surface of the top cover plate 1 in the area of ​​each mounting hole 11, 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 the through hole of the lower insulating member 6 is recessed to form an annular recess 63, and the outer peripheral portion of the pole protrusion ring 22 is fitted in the annular recess 63, wherein the annular recess 63 and the pole protrusion ring 22 are both square in shape, and the insulating protrusion ring 61 and the recessed groove 13 are also both square in shape, thereby preventing the pole structure 2 from rotating after assembly. At the same time, the setting of this structure enables the pole structure 2 to be reliably positioned.

Claims

1. A battery top cover assembly with a welded terminal, 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), the top of the pole portion (21) having a conductive convex (24) and a plurality of convex columns (23); A cap (3) located above each mounting hole (11), each cap (3) being provided with a central hole (310) adapted to the guide protrusion (24), a rivet hole (311) adapted to each protrusion (23), and a pressing portion (32) located on the periphery of the region having the central hole (310) and the rivet hole (311); 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); A lower insulating member (6) is fitted on the lower surface of the top cover plate (1); An upper insulating member (4) is located above each mounting hole (11) and is arranged 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); wherein each pole structure (2) moves from bottom to top so that after the pole portion (21) passes through the sealing ring (5), the mounting hole (11) and the first through hole (42) in sequence, the pole convex ring (22) contacts the sealing ring (5); the cap (3) covers at least a portion of the connecting ring (213) and at least a portion of the upper insulating member (4), and each convex column (23) passes through the corresponding rivet hole (311); after the top of each convex column (23) is riveted, a rivet convex portion (232) is formed on the outer periphery of the top of each convex column (23), and the rivet convex portion (232) is pressed on the upper portion of the rivet hole (311). The edge of the port allows the pole convex ring (22) to be buckled on the lower insulating member (6), and the cap (3) to be pressed against the upper insulating member (4), so that the pole structure (2), the cap (3), the sealing ring (5), and the upper insulating member (4) are all assembled and fixed on the top cover plate (1); the pole portion (21) of the pole structure (2) in one mounting hole (11) 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), the guide protrusion (24) is formed on the top of the aluminum member (212), a plurality of protrusions (23) are formed on the top of the copper member (211), and all penetrate the connecting ring (213) on the aluminum member (212) and are located on the outer periphery of the guide protrusion (24) and are in an extended state, and the pole convex ring (22) is formed on the outer periphery of the copper member (211); the pole structure (2) in the other mounting hole (11) is an aluminum pole.

2. A battery top cover assembly with welded terminals according to claim 1, characterized in that: 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).

3. A battery top cover assembly with welded terminals according to claim 2, characterized in that: The welding interface layer (25) formed during laser welding is at least one annular layer.

4. A battery top cover assembly with welded terminals according to claim 1, characterized in that: The cap (3) includes a cap body (31), a pressing portion (32) which is a pressing ring piece arranged around the outer periphery of the cap body (31), the center hole (310) and the rivet hole (311) are both arranged on the cap body (31), an annular surface (214) arranged around the conductive protrusion (24) on the pole part (21) is higher than the top surface of the upper insulating member (4), the cap body (31) is arranged on the top of the pole part (21) and covers the annular surface (214) of the pole part (21), and the pressing ring piece contacts the annular surface (214) arranged around the conductive protrusion (24) on the pole part (21).

5. A battery top cover assembly with welded terminals according to claim 4, characterized in that: The upper end edge of each of the riveting holes (311) is recessed to form a continuously arranged annular recess (312), the inner diameter of the annular recess (312) being larger than the inner diameter of the riveting hole (311), and the riveting protrusion (232) being sunken into the annular recess (312), so that a step portion (314) is formed between the annular recess (312) and the riveting hole (311).

6. A battery top cover assembly with welded terminals according to claim 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 (15) 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 (15), and the outer periphery of the upper insulating member (4) contacts the inner wall of the annular convex rib (12).

7. A battery top cover assembly with welded terminals according to claim 6, 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 pressed ring piece contacts the inner wall of the first annular convex strip (41).

8. A battery top cover assembly with welded terminals according to claim 7, 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).

9. A battery top cover assembly with welded terminals according to claim 8, characterized in that: The lower insulating member (6) is provided with two second through holes (62) corresponding to the positions of the mounting holes (11), and each sealing ring (5) is located in the two second through holes (62).

10. A battery top cover assembly with welded terminals according to claim 9, characterized in that: A recessed groove (13) is formed on the lower surface of the region of each mounting hole (11) on the top cover plate (1), and 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) fits 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 the second through hole (62) of the lower insulating member (6), and the outer peripheral portion of the pole convex ring (22) fits in the annular recess (63); the outer shapes of the annular recess (63) and the pole convex ring (22) are both square, and the insulating convex ring (61) and the recessed groove (13) are also square.

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