CN219226555U - Penetrating welded pole connection structure and battery top cover - Google Patents

Abstract

The utility model discloses a penetrating welded pole connection structure and a battery top cover, wherein the pole connection structure comprises a top cover plate, a pole is fixed to a pole installation position of the top cover plate by a pole fixing structure to form a positive pole component and a negative pole component, the pole fixing structure comprises a bracket, a welding piece, a sealing piece and an upper plastic piece, a first welding piece of the pole penetrates through a second penetrating part arranged through the top cover plate and then is welded with a second welding part arranged on the welding piece through penetrating welding, and the pole is insulated from the top cover plate. The pole connection structure can improve the structural strength and the torsion resistance of the pole.

Description

Penetrating welded pole connection structure and battery top cover

Technical Field

The utility model belongs to the technical field of power battery matching of new energy automobiles, and particularly relates to a penetrating welded pole connection structure and a battery top cover.

Background

The power battery is an important component of the new energy vehicle, and the existing new energy battery mostly adopts a lithium ion battery as the power battery. For power lithium batteries, besides key components such as an electric core, a BMS and the like, a battery shell structure is also an important factor of safety. The pole is a component of the battery module, and is used for connecting the positive electrode and the negative electrode of the battery cell in the module for conducting electricity, and also has corresponding structural strength and sealing requirements so as to meet the application requirements of automobiles.

Disclosure of Invention

The utility model aims to provide a penetrating welded pole connecting structure with high structural strength and high torsion strength of a pole and a battery top cover.

The penetrating welded pole connection structure comprises a top cover plate, wherein at least one pole hole is formed in the top cover plate, and a pole is fixed to a pole installation position by a pole fixing structure to form a positive pole component or a negative pole component; and the pole and the top cover sheet are mutually insulated.

The top cover plate is also provided with at least one first through part, and the pole post comprises at least one first welding piece.

The pole fixing structure comprises a bracket, a welding piece, a sealing piece and an upper plastic piece, wherein the bracket is arranged between the pole and the top cover piece, the welding piece is arranged below the top cover piece, and the sealing piece is arranged between the welding piece and the top cover piece; the support is provided with a second through part, the sealing piece is provided with a third through part, and the welding piece is provided with a second welding part.

The first welding piece sequentially passes through the second through part, the first through part and the third through part and then contacts with the second welding part, the first welding piece and the second welding part are welded with each other through penetration welding, insulation is formed between the pole and the top cover sheet, and the upper plastic part is formed on the periphery of the pole in an injection molding mode.

According to the penetrating welded pole connection structure, the first through part, the second through part or the third through part is a through hole or a notch which is arranged in a penetrating way, so that the first welding piece passes through the top cover piece, the support or the sealing piece.

According to the penetrating welded pole connection structure, the cross section of the first welding piece, the first through part, the second through part or the third through part is arc-shaped.

According to the penetrating welded pole connection structure, the support and the sealing piece are made of insulating materials, so that the pole and the top cover piece are arranged in an insulating mode.

According to the pole connection structure for penetration welding, the support is PPS (polyphenylene sulfide) or other insulating engineering plastics with certain strength, and the sealing element is made of soft insulating materials such as fluororubber.

According to the penetrating welded pole connection structure, the pole comprises a pole portion and a pole fixing portion, and the first welding piece is arranged on the lower surface of the pole fixing portion.

According to the penetrating welded pole connection structure, the support comprises a support body and a first through hole, a plurality of first insulating parts are further arranged on the outer side of the support body, and the second through parts are arranged on the first insulating parts.

According to the through-welded pole connection structure, the welding member comprises a welding member main body and a fourth through hole, and the second welding portion is convexly formed on the upper surface of the welding member main body.

According to the through-welded pole connection structure, the sealing member comprises a sealing member main body and a second through hole, the second insulating member is arranged on the upper surface of the sealing member main body in a protruding mode, and the third through part is arranged on the second insulating member in a penetrating mode.

According to the pole connecting structure through welding, the upper plastic part comprises an upper plastic part main body and a third through hole, and the upper plastic part main body is matched with the pole fixing part.

According to the through-welded pole connection structure, the first insulating part or the second insulating part is at least partially matched in the first through-hole part so as to be in insulating fit with the first through-hole part.

According to the above-described penetration-welded pole connection structure, the first insulating protrusion is further formed on the lower surface of the first insulating portion around the second through portion, the first insulating protrusion being provided so as to protrude downward with respect to the first insulating portion; the first insulating protrusion has an outer diameter equal to or smaller than an inner diameter of the first through-hole portion so that the first insulating portion extends at least partially into the first through-hole portion.

According to the penetrating welded pole connection structure, the bracket convex part protruding relative to the lower surface of the bracket main body is further arranged around the first through hole; the lower surface of the support body separation pole fixing part and the upper surface of the concave ring part insulate the support body separation pole fixing part and the concave ring part, and the support convex part is used for separating between the pole and the first through hole so as to insulate the pole from the first through hole.

According to the above-mentioned penetration welded pole connection structure, the second welding portion is provided with the penetration welding portion and the welding protrusion protruding around the penetration welding portion, and the first welding member is in contact with the penetration welding portion and is welded to each other by penetration welding.

According to the pole connecting structure for penetrating welding, the upper plastic part main body comprises a cavity part formed by wrapping the pole fixing part during injection molding.

According to the penetration welded pole connection structure, the first welding piece and the first through part are separated by the first insulating convex part and the second insulating piece to be insulated.

According to the pole connection structure for penetration welding, the pole fixing portion comprises a first pole protruding portion and a second pole protruding portion, the first pole protruding portion is arranged protruding in the radial direction relative to the second pole protruding portion, a second notch is further formed between the first pole protruding portion and the second pole protruding portion, and the upper plastic piece fills the second notch so that the upper plastic piece can not be matched onto the pole in a rotating mode.

According to the through-welded pole connection structure, the first notch is formed between the adjacent first insulating parts, the second pole convex part corresponds to the first notch, and the first pole convex part corresponds to the first insulating part. The upper plastic part main body comprises a first plastic part and a second plastic part, the first plastic part corresponds to the second pole convex part, the second plastic part corresponds to the first pole convex part, and the first plastic part comprises an insulating part formed by filling the first notch.

According to the penetrating welded pole connection structure, the lower plastic part is arranged below the top cover sheet, the upper surface of the lower plastic part is provided with the plurality of first connection parts, the lower surface of the top cover sheet is provided with the second connection parts, and the first connection parts and the second connection parts are in concave-convex fit to connect the lower plastic part and the top cover sheet; and the lower plastic part is also provided with a pole matching part which is arranged corresponding to the pole mounting position, and the pole matching part comprises a fifth through hole and a pole convex part which is arranged around the fifth through hole.

According to the through-welded pole connection structure, the sealing member is in a compressed state after welding.

According to the penetration welded pole connection structure, the first welding pieces are three and uniformly arranged along the circumferential direction to form an annular penetration welded structure.

According to the pole connecting structure for penetrating welding, the periphery of the pole hole is further provided with the concave ring part concavely arranged on the upper surface of the top cover plate, and the first through part is arranged on the concave ring part.

According to the penetrating welded pole connection structure, the sealing piece further comprises a second concave-convex portion concavely arranged in the second insulating piece, and the second welding portion is matched in the second concave-convex portion to be positioned.

According to the penetrating welded pole connection structure, the top cover plate is an integrated top cover plate, and two pole holes are respectively formed at two ends of the top cover plate.

According to the penetrating welded pole connection structure, the explosion-proof valve port and the liquid injection port for the explosion-proof valve are arranged between the two pole holes.

According to the penetrating welded pole connection structure, the explosion-proof valve comprises an explosion-proof valve plate and a protective film; the anti-explosion valve plate is matched with the anti-explosion valve port from the lower part, and the protective film is attached to the upper part of the anti-explosion valve port.

According to the pole connection structure for penetration welding, the anti-explosion valve plate is integrally formed on the top cover plate, and the protective film is attached to the anti-explosion valve plate.

The utility model provides a penetrating welded utmost point post connection structure, includes the top cover piece, be equipped with at least one utmost point post hole on the top cover piece, the utmost point post is fixed to utmost point post installation position department by utmost point post fixed knot and is formed into anodal utmost point post subassembly or negative pole post subassembly.

The top cover plate is also provided with at least one first through part, and the pole post comprises at least one first welding piece.

The pole fixing structure comprises a welding piece, a sealing piece and an upper plastic piece, wherein the welding piece is arranged below the top cover piece, and the sealing piece is arranged between the welding piece and the top cover piece; the sealing piece is provided with a third through part, and the welding piece is provided with a second welding part.

The first welding piece sequentially passes through the second through part, the first through part and the third through part and then contacts with the second welding part, the first welding piece and the second welding part are welded with each other through penetration welding, insulation is formed between the pole and the top cover sheet, and the upper plastic part is formed on the periphery of the pole in an injection molding mode. The first through part or the third through part is a through hole or a notch which is arranged in a penetrating way.

The pole comprises a pole portion and a pole fixing portion, and the first welding piece is arranged on the lower surface of the pole fixing portion. The welding piece comprises a welding piece main body and a fourth through hole, and the second welding part is convexly formed on the upper surface of the welding piece main body. The sealing element comprises a sealing element main body and a second through hole, a second insulating element is convexly arranged on the upper surface of the sealing element main body, and a third through part is arranged on the second insulating element in a penetrating mode. The upper plastic part comprises an upper plastic part main body and a third through hole, and the upper plastic part main body is matched with the pole fixing part.

The second insulator is at least partially fitted in the first through-hole portion to insulatively fit between the first weld and the first through-hole portion.

A battery top cap comprising any one of the above penetration welded post connection structures.

The penetrating welded pole connection structure and the battery top cover have the following beneficial effects:

1. the pole is welded and connected in a penetrating welding mode, so that the structural strength and torsion resistance of the pole can be improved.

2. The first welding piece of the pole post passes through the second through part of the top cover plate and is provided with an insulating structure between the first welding piece and the second through part.

3. The upper plastic part is formed in an injection molding mode, and the inside of the upper plastic part is wrapped with the bracket and the pole fixing part, so that the structural strength of the upper plastic part is improved.

4. The second notch arranged on the periphery of the pole and the second pole convex part eccentrically arranged can increase the structural strength and the torsion resistance of the plastic-coated part after encapsulation and injection molding.

5. The first welding piece of the pole post is arranged in the bracket and the sealing piece in a penetrating way and is welded with the welding piece, and the first welding piece is arranged in the first through part in a penetrating way, so that the rotation of each part is locked.

6. The sealing element is in a compressed state after welding, and the sealing performance of the pole hole meets the requirements.

7. The assembly is simple, and the production efficiency is high.

Drawings

FIG. 1 is a schematic view of a battery top cover according to an embodiment of the present utility model;

FIG. 2 is an exploded view of the embodiment of FIG. 1;

FIG. 3 is a cross-sectional view of the embodiment of FIG. 1 taken along section AA;

FIG. 4 is an enlarged partial schematic view of FIG. 3;

FIG. 5 is a schematic view of the structure of the top cover in the embodiment of FIG. 1;

FIG. 6 is a schematic view of the structure of the bracket in the embodiment of FIG. 1;

FIG. 7 is a schematic view of the bottom view of the pole in the embodiment of FIG. 1;

FIG. 8 is a schematic top elevational view of the pole in the embodiment of FIG. 1;

FIG. 9 is a schematic illustration of the seal configuration of the embodiment of FIG. 1;

FIG. 10 is a schematic view of the bottom view of the upper molding in the embodiment of FIG. 1;

FIG. 11 is a schematic view of the weld of the embodiment of FIG. 1;

FIG. 12 is a cross-sectional view of FIG. 9;

FIG. 13 is a schematic view of the lower molding member of the embodiment of FIG. 1;

FIG. 14 is an exploded view of the cross-sectional structure of the embodiment of FIG. 1 taken along section AA.

Wherein, top cap piece 2, explosion-proof valve 3, lower molding 4, positive electrode post assembly 10a, negative electrode post assembly 10b, post 10, bracket 11, welding 12, sealing 13, upper molding 14, post mounting 21, liquid injection port 22, explosion-proof valve port 23, explosion-proof valve plate 31, protective film 32, post portion 101, post fixing portion 102, first welding 103, first post boss 104, second post boss 105, second notch 106, bracket body 111, first through hole 112, bracket boss 113, first insulating portion 114, second through portion 115, first insulating boss 116, first notch 117, welding body 121, fourth through hole 122, second welding portion 123, penetration welding portion 124, welding boss 125, sealing body 131, second through hole 132, second insulating body 133, third through portion 134, second concave-convex portion 135, first welding boss 137, upper molding body 141, third through hole 142, first through hole 143, second through hole portion 145, second through hole 144, second through hole portion 145, second through hole 212, first through hole 212, buffer portion 213, and fifth through hole 212 are connected.

Detailed Description

The utility model will be described in detail below with respect to certain specific embodiments thereof in order to better understand the utility model and thereby to more clearly define the scope of the utility model as claimed. It should be noted that the following description is only some embodiments of the inventive concept and is only a part of examples of the present utility model, wherein the specific direct description of the related structures is only for the convenience of understanding the present utility model, and the specific features do not naturally and directly limit the implementation scope of the present utility model. Conventional selections and substitutions made by those skilled in the art under the guidance of the inventive concept should be considered as being within the scope of the claimed utility model.

A top cover of a power battery is used for being matched to a battery shell to form a battery module, and is matched with other parts such as a BMS module to form the power battery.

As shown in fig. 1, the top cover is an integrated battery top cover, which is in a rectangular shape as a whole, a positive electrode pole component 10a and a negative electrode pole component 10b are respectively arranged at two ends, and an explosion-proof valve 3 for explosion-proof and a liquid injection port 22 for injecting electrolyte are arranged between the two pole components. After the battery cell is rotated in a battery case (not shown in the figure), the positive and negative electrode column assemblies are electrically connected with the positive and negative electrodes of the battery cell, respectively, and the battery top cover is connected with the battery case to form the battery module.

As shown in fig. 2, the positive electrode tab assembly 10a and the negative electrode tab assembly 10b of the battery top cover each include a tab 10 and a tab fixing structure for fixing the tab 10 to the top cover sheet 2. The top cover sheet 2 is provided with a pole mounting position 21, and the pole 10 is fixed to the pole mounting position 21 by the pole fixing structure to form a positive pole component 10a or a negative pole component 10b.

The pole fixing structure comprises a support 11, a welding piece 12, a sealing piece 13 and an upper plastic piece 14, wherein a pole mounting position 21 comprises a pole hole 211, the support 11 is arranged between a pole 10 and a top cover piece 2, at least one part of the pole 10 penetrates through the top cover piece 2 to be matched to the welding piece 12 so as to be connected with the welding piece in a welded mode, the welding piece 12 is arranged below the top cover piece 2, the welding piece 12 and the top cover piece 2 are welded with each other through penetration welding, and the sealing piece 13 is arranged between the welding piece 12 and the top cover piece 2 so as to play a sealing and insulating role.

In this embodiment, the pole 10 and the top cover sheet 2 are arranged in an insulating manner, so that the insulation of the battery top cover satisfies the requirement.

In this embodiment, two pole holes 211 are respectively disposed near two ends of the top cover 2, and +/-marks are correspondingly marked on the upper surface of the top cover 2 to mark the polarity of the poles.

As shown in fig. 5, the top cover sheet 2 is provided with two pole mounting positions 21, and a liquid injection port 22 and an explosion-proof valve port 23 are arranged between the two pole mounting positions 21. The liquid filling port 22 is provided through the top cover sheet 2 for filling electrolyte, and the explosion-proof valve port 23 is also provided through the top cover sheet 2 for matching with the explosion-proof valve.

In this embodiment, the pole mounting portion 21 includes a pole hole 211 penetrating through the top cover 2, so that at least a portion of the pole 10 passes through and is electrically connected to a connecting piece (not shown). The pole hole 211 is provided with a concave ring portion 213 surrounding the top surface of the cover plate 2, and the concave ring portion 213 is provided with a plurality of first through portions 212.

In this embodiment, the first through portion 212 is an arc-shaped through hole. In other embodiments, the shape or number of the first through portions 212 may be set as desired.

As shown in fig. 2, the explosion-proof valve 3 comprises an explosion-proof valve plate 31 and a protective film 32, wherein the explosion-proof valve plate 31 is matched with the explosion-proof valve port 23 from the lower part and welded on the explosion-proof valve plate 31; the protective film 32 is attached over the explosion proof valve port 23 to cover the explosion proof valve port 23. In other embodiments, the top cover sheet 2 may not have the valve opening 23, but the valve sheet 31 may be integrally formed on the top cover sheet 2, and the protective film 32 may be attached to the valve sheet 31 to cover the valve sheet.

As shown in fig. 6, the bracket 11 has an overall shape similar to a circular ring, and includes a bracket body 111 and a first through hole 112 penetrating the center of the bracket body 111; further, a bracket convex portion 113 protruding from the lower surface of the bracket body 111 is provided around the first through hole 112. The bracket 11 is provided between the pole 10 and the top cover piece 2, more specifically, between the lower surface of the pole 10 and the concave ring portion 213. At this time, the holder body 111 separates the lower surface of the pole fixing portion 102 of the pole 10 and the upper surface of the concave ring portion 213 from contact, and the holder protrusion 113 is located between the pole 10 and the first through hole 112 so that they are not in contact.

In this embodiment, the bracket 11 is made of an insulating material, so that the pole 10 is primarily insulated from the top cover 2.

As shown in fig. 6, a plurality of first insulating portions 114 are further disposed on the outer side of the holder main body 111, and second through portions 115 penetrating the first insulating portions 114 are disposed thereon. In this embodiment, the second through portion 115 is also in an arc shape, and the number of the second through portions is three and uniformly arranged. Of course, in other embodiments, the shape and number of the second through portions 115 may be set as needed, and are not limited thereto.

As shown in fig. 6, a first insulating protrusion 116 is formed on the lower surface of the first insulating portion 114 around the second through portion 115, and is provided so as to protrude from the first insulating portion 114; the first insulation protrusion 116 is provided so as to extend at least partially into the first through-hole 212, so as to insulate the pole 10 from the first through-hole 212. A first notch 117 is formed between adjacent first insulating portions 114.

As shown in fig. 7, 8, 14, the pole 10 includes a pole portion 101 and a pole fixing portion 102 provided at the periphery thereof, the pole portion 101 being respectively protruded upward and downward to form upper and lower pole faces for conduction. The pole fixing portion 102 includes a first pole protrusion 104 and a second pole protrusion 105, which are circumferentially disposed, and a second notch 106 is formed between the first pole protrusion 104 and the second pole protrusion 105.

As shown in fig. 8, the first pole convex portion 104 is provided so as to protrude in the radial direction with respect to the second pole convex portion 105.

As shown in fig. 7, the lower surface of the pole fixing part 102 is convexly provided with a first welding member 103, and the first welding member 103 is convexly provided on the lower surface of the first pole convex part 104 so as to form a downwardly convexly provided shape. In this embodiment, the first welding member 103 is also arc-shaped to match the shapes of the first through portion 212 and the second through portion 115.

After the first welding member 103 is fitted, it passes through the second through portion 115 and the first through portion 212, and then extends below the top cover sheet 2 to be welded to the welding member 12. The width of the second through-hole 115 is smaller than the width of the first through-hole 212, and the first insulating protrusion 116 can extend into the first through-hole 212 at least partially, so that the first solder 103 and the first through-hole 212 are insulated from each other by the first insulating protrusion 116.

As shown in fig. 9, the sealing member 13 is in an annular shape as a whole, and includes a sealing member main body 131 and a second through hole 132 penetrating through the center of the sealing member main body 131, wherein a second insulating member 133 is convexly disposed on the upper surface of the sealing member main body 131, and a third penetrating portion 134 penetrating through the second insulating member 133 is disposed on the upper surface of the sealing member main body 131; wherein the third through portion 134 corresponds in shape and position to the first welding member 103 of the pole 10 to allow it to pass through, and the second insulating member 133 corresponds in shape and position to the first through portion 212 of the top cover sheet 2 to fit at least partially into the first through portion 212, insulating between the first welding member 103 and the first through portion 212.

In the present embodiment, as shown in fig. 4, insulation between the first solder 103 and the first through portion 212 is formed by the first insulating portion 114 and the second insulating member 133 in cooperation. In other embodiments, one of them may be formed.

As shown in fig. 12, the sealing member 13 further includes a second concave-convex portion 135 concavely provided in the second insulating member 133, the second concave-convex portion 135 is provided with a first welding protrusion 136 in an outer direction and a second welding protrusion 137 in an inner direction around the second through hole 132. The weldment 12 is positioned between the first welding boss 136 and the second welding boss 137.

In the present embodiment, the protruding second welding portion 123 is matched with the recessed second concave-convex portion 135, so as to achieve the relative positioning of the two, reduce the matching thickness, and simplify the structure of the pole assembly.

As shown in fig. 11, the welding member 12 has a circular ring-like shape as a whole, and includes a welding member body 121 and a fourth through hole 122 penetrating through the center of the welding member body 121; the upper surface of the welding body 121 is further provided with a second welding portion 123, and the second welding portion 123 is provided with a penetration welding portion 124 and a welding protrusion 125 protruding around the penetration welding portion 124.

After the fitting, the lower surface of the first welding member 103 of the pole 10 is in contact with the penetration welding portion 124, and the first welding member 103 and the penetration welding portion 124 are welded to each other by the penetration welding manner to form an integrated structure.

In this embodiment, the seal 13 is in compression after welding, which can be achieved by relatively compressing the pole 10 and the weld 12 prior to welding so that the seal at the pole bore 211 is tight.

As shown in fig. 1-3, the upper molding 14 is formed on the periphery of the pole 10 by injection molding, so as to encapsulate the pole 10, the bracket 11, and other structures, so that only the upper pole surface of the pole 10 is exposed for conducting electricity.

As shown in fig. 10, the upper molding member 14 is also in an annular shape as a whole, and includes an upper molding member body 141 and a third through hole 142 penetrating through the center of the upper molding member body 141, wherein the third through hole 142 is used for exposing the upper pole cylindrical surface of the pole 10.

The upper molding body 141 includes a first molding portion 143 and a second molding portion 144, the first molding portion 143 includes an insulating portion 145 and a cavity portion 146 located inside the insulating portion, and the second molding portion 144 is a notch communicating with the cavity portion 146.

After the pole 10 is fitted to the bracket 11, the pole fixing portion 102 is attached to the bracket body 111, the first pole convex portion 104 overlaps the first insulating portion 114, and the second pole convex portion 105 overlaps the first notch 117. Thus, during the injection molding process of the upper molding 14, the first molding portion 143 and the second molding portion 144 are formed; the insulating portion 145 of the first plastic portion 143 is formed by filling the first notch 117 with glue, and the cavity 146 is used for accommodating the pole fixing portion 102 or is formed by surrounding the pole fixing portion 102 during injection molding.

As shown in fig. 13, the battery top cover further includes a lower plastic part 4, the upper surface of the lower plastic part 4 is convexly provided with a plurality of first connection parts 401, which are riveting convex columns, and the lower surface of the top cover 2 is correspondingly provided with second connection parts (not shown in the figure) which are riveting concave holes. When the first connecting portion 401 is heated and melted, the first connecting portion is then matched into the second connecting portion, so that the two are connected through heat melting and riveting, and the lower plastic part 4 and the top cover sheet 2 are connected mutually.

In this embodiment, the lower molding member 4 is further provided with a pole mating portion 41 corresponding to the pole mounting position 21, and the pole mating portion 41 includes a fifth through hole 411 and a pole protruding portion 412 disposed around the fifth through hole 411.

In this embodiment, the lower plastic part 4 is further provided with a buffer cavity 42, which is disposed below the explosion-proof valve 3 and has a plurality of buffer through holes that are disposed therethrough to play a role of buffering.

Claims (10)

1. The penetrating welded pole connecting structure comprises a top cover plate (2), wherein at least one pole hole (211) is formed in the top cover plate (2), and a pole (10) is fixed to a pole mounting position (21) by a pole fixing structure to form a positive pole component (10 a) or a negative pole component (10 b); it is characterized in that the method comprises the steps of,

the top cover sheet (2) is also provided with at least one first through part (212), and the pole (10) comprises at least one first welding piece (103);

the pole fixing structure comprises a bracket (11), a welding piece (12), a sealing piece (13) and an upper plastic piece (14), wherein the bracket (11) is arranged between a pole (10) and a top cover piece (2), the welding piece (12) is arranged below the top cover piece (2), and the sealing piece (13) is arranged between the welding piece (12) and the top cover piece (2); a second through part (115) is arranged on the bracket (11), a third through part (134) is arranged on the sealing piece (13), and a second welding part (123) is arranged on the welding piece (12);

the first welding piece (103) sequentially passes through the second through part (115), the first through part (212) and the third through part (134) and then contacts with the second welding part (123), the first welding piece (103) and the second welding part (123) are welded with each other through penetration welding, insulation is provided between the pole column (10) and the top cover sheet (2), and the upper plastic part (14) is formed on the periphery of the pole column (10) through injection molding.

2. The penetration welded pole connection structure according to claim 1, characterized in that the first through portion (212), the second through portion (115) or the third through portion (134) is a through hole or a notch provided therethrough for the first welding member (103) to pass through the top cover sheet (2), the bracket (11) or the sealing member (13).

3. The penetration welded pole connection structure according to claim 1, characterized in that the cross-sectional shape of the first welding member (103), the first through portion (212), the second through portion (115), or the third through portion (134) is an arc shape.

4. A penetration welded pole connection according to any one of claims 1-3, characterized in that the bracket (11) and the seal (13) are made of insulating material, so that the pole (10) and the top cover piece (2) are arranged in an insulating manner;

the pole (10) comprises a pole part (101) and a pole fixing part (102), and a first welding piece (103) is arranged on the lower surface of the pole fixing part (102);

the bracket (11) comprises a bracket main body (111) and a first through hole (112), a plurality of first insulating parts (114) are further arranged on the outer side of the bracket main body (111), and second through parts (115) are arranged on the first insulating parts (114);

the welding piece (12) comprises a welding piece main body (121) and a fourth through hole (122), and a second welding part (123) is convexly formed on the upper surface of the welding piece main body (121);

the sealing element (13) comprises a sealing element main body (131) and a second through hole (132), a second insulating element (133) is convexly arranged on the upper surface of the sealing element main body (131), and a third through part (134) is arranged on the second insulating element (133) in a penetrating way;

the upper plastic part (14) comprises an upper plastic part main body (141) and a third through hole (142), and the upper plastic part main body (141) is matched with the pole fixing part (102);

the first insulating portion (114) or the second insulating member (133) is at least partially fitted into the first through-hole portion (212) to fit the first welding member (103) and the first through-hole portion (212) in an insulating manner.

5. The penetration-welded pole connection structure according to claim 4, characterized in that a first insulation protrusion (116) is further formed on the lower surface of the first insulation part (114) around the second penetration part (115), the first insulation protrusion (116) being provided protruding downward with respect to the first insulation part (114); the outer diameter of the first insulation protruding part (116) is smaller than or equal to the inner diameter of the first through part (212) so that the first insulation part (114) at least partially extends into the first through part (212);

a bracket convex part (113) protruding relative to the lower surface of the bracket main body (111) is also arranged around the first through hole (112); the lower surface of the pole fixing part (102) and the upper surface of the concave ring part (213) are separated by the bracket main body (111) to insulate the two, and the bracket convex part (113) separates the pole (10) from the first through hole (112) to insulate the two;

the second welding part (123) is provided with a penetrating welding part (124) and a welding convex part (125) protruding around the penetrating welding part (124), and the first welding piece (103) is contacted with the penetrating welding part (124) and mutually welded through penetrating welding;

the upper plastic part main body (141) comprises a cavity part (146) formed by wrapping the pole fixing part (102) during injection molding;

the first welding member (103) and the first through portion (212) are separated from each other by a first insulating protrusion (116) and a second insulating member (133) to insulate the same.

6. The penetration welded pole connection structure according to claim 4, wherein the pole fixing portion (102) includes a first pole protrusion (104) and a second pole protrusion (105), the first pole protrusion (104) is convexly disposed with respect to the second pole protrusion (105) in a radial direction, a second notch (106) is further formed between the first pole protrusion (104) and the second pole protrusion (105), and the upper molding (14) fills the second notch (106);

a first notch (117) is formed between adjacent first insulating parts (114), the second pole convex part (105) corresponds to the first notch (117), and the first pole convex part (104) corresponds to the first insulating part (114);

the upper plastic part main body (141) comprises a first plastic part (143) and a second plastic part (144), the first plastic part (143) corresponds to the second pole convex part (105), the second plastic part (144) corresponds to the first pole convex part (104), and the first plastic part (143) comprises an insulating part (145) formed by filling the first notch (117).

7. The through-welded pole connection structure according to claim 5 or 6, wherein a lower plastic part (4) is further arranged below the top cover sheet (2), a plurality of first connection parts (401) are arranged on the upper surface of the lower plastic part (4), a second connection part is arranged on the lower surface of the top cover sheet (2), and the first connection parts (401) are in concave-convex fit with the second connection parts to connect the lower plastic part (4) with the top cover sheet (2); and a pole matching part (41) which is arranged corresponding to the pole mounting position (21) is further arranged on the lower plastic part (4), and the pole matching part (41) comprises a fifth through hole (411) and a pole protruding part (412) which is arranged around the fifth through hole (411).

8. The penetration welded pole connection according to claim 4, characterized in that the seal (13) is in compression after welding; the first welding pieces (103) are three and are uniformly arranged along the circumferential direction; the periphery of the pole hole (211) is also provided with a concave ring part (213) concavely arranged on the upper surface of the top cover plate (2), and the first through part (212) is arranged on the concave ring part (213);

the sealing piece (13) further comprises a second concave-convex part (135) concavely arranged in the second insulating piece (133), and the second welding part (123) is matched in the second concave-convex part (135) to be positioned;

the top cover piece (2) is an integrated top cover piece, two pole holes (211) are respectively arranged at two ends of the top cover piece (2), and an explosion-proof valve port (23) and a liquid injection port (22) for arranging the explosion-proof valve (3) are arranged between the two pole holes (211); the explosion-proof valve (3) comprises an explosion-proof valve plate (31) and a protective film (32); the anti-explosion valve plate (31) is matched with the anti-explosion valve port (23) from the lower part, and the protective film (32) is attached to the upper part of the anti-explosion valve port (23); or, the anti-explosion valve plate (31) is integrally arranged on the top cover plate (2), and the protective film (32) is attached to the anti-explosion valve plate (31);

the support is made of PPS material, and the sealing element is made of fluororubber material.

9. The penetrating welded pole connecting structure comprises a top cover plate (2), wherein at least one pole hole (211) is formed in the top cover plate (2), and a pole (10) is fixed to a pole mounting position (21) by a pole fixing structure to form a positive pole component (10 a) or a negative pole component (10 b); it is characterized in that the method comprises the steps of,

the top cover sheet (2) is also provided with at least one first through part (212), and the pole (10) comprises at least one first welding piece (103);

the pole fixing structure comprises a welding piece (12), a sealing piece (13) and an upper plastic piece (14), wherein the welding piece (12) is arranged below the top cover piece (2), and the sealing piece (13) is arranged between the welding piece (12) and the top cover piece (2); a third through part (134) is arranged on the sealing piece (13), and a second welding part (123) is arranged on the welding piece (12);

the first welding piece (103) is contacted with the second welding part (123) after sequentially passing through the first through part (212) and the third through part (134), the first welding piece (103) and the second welding part (123) are welded with each other through penetration welding, insulation is provided between the pole (10) and the top cover sheet (2), and the upper plastic part (14) is formed on the periphery of the pole (10) in an injection molding mode;

the first through part (212) or the third through part (134) is a through hole or a notch which is arranged in a penetrating way;

the pole (10) comprises a pole part (101) and a pole fixing part (102), and a first welding piece (103) is arranged on the lower surface of the pole fixing part (102);

the welding piece (12) comprises a welding piece main body (121) and a fourth through hole (122), and a second welding part (123) is convexly formed on the upper surface of the welding piece main body (121);

the sealing element (13) comprises a sealing element main body (131) and a second through hole (132), a second insulating element (133) is convexly arranged on the upper surface of the sealing element main body (131), and a third through part (134) is arranged on the second insulating element (133) in a penetrating way;

the upper plastic part (14) comprises an upper plastic part main body (141) and a third through hole (142), and the upper plastic part main body (141) is matched with the pole fixing part (102);

the second insulator (133) is fitted at least partially into the first through-hole portion (212) to fit the first weldment (103) and the first through-hole portion (212) in an insulating manner.

10. A battery top cap comprising the through-welded post connection structure of any one of claims 1-9.

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