CN220753586U - Secondary battery top cap subassembly and secondary battery - Google Patents

Abstract

The utility model discloses a top cover assembly of a secondary battery and the secondary battery, comprising a top cover plate, a polar column and a lower insulator, wherein the top cover plate is defined with an upper surface and a lower surface, the polar column is fixedly held on the top cover plate, the lower insulator is abutted against the lower surface of the top cover plate, the top cover plate comprises a plurality of blind holes which are formed from the lower surface of the top cover plate towards the upper surface, the lower insulator comprises a plurality of through holes which are respectively arranged corresponding to the blind holes and penetrate through the lower insulator, the top cover assembly of the secondary battery further comprises a plurality of fixing pieces which respectively correspond to the blind holes and the through holes, and each fixing piece sequentially penetrates through the through holes of the lower insulator and is fixedly connected in the blind holes of the top cover plate. The secondary battery top cover assembly and the secondary battery thereof can effectively prevent the assembly connection parts of the top cover from rotating, improve the torsional and tensile strength, maintain the stability and improve the assembly yield of the top cover.

Description

Secondary battery top cap subassembly and secondary battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a top cover assembly of a secondary battery and the secondary battery.

Background

With the rapid development of products such as new energy electric vehicles, energy storage systems and the like, secondary batteries play an increasingly important role in various industrial application scenes. The secondary battery is a rechargeable battery that converts chemical energy into electric energy by charging and discharging between a positive electrode and a negative electrode, and positive and negative electrode material ions move between the positive and negative electrodes to convert chemical energy into electric energy. The secondary battery includes, but is not limited to, various types of lithium ion batteries including lithium iron phosphate, ternary lithium batteries, etc., and is mainly applied to new energy electric vehicles, but is not limited to this application. At present, the cylinder, square and soft package are three forms of main stream lithium ion secondary battery packaging, the square battery made of aluminum shell or steel shell materials is a common square lithium ion battery, and the popularity of the square aluminum shell lithium battery in China is very high. The latest demands of people can be met only by continuously improving the safety and the energy density of the lithium battery, and the square aluminum-shell lithium ion battery top cover is used as an important component of the lithium ion battery, so that higher requirements on the safety design, the dead weight and the space utilization rate of the square aluminum-shell lithium ion battery top cover are further met.

The secondary battery top cover component is a core component for guaranteeing the safety of the secondary battery, and plays important roles of supporting, fixing and sealing, safety protection, current conduction, energy transmission and the like. The production flow and part of the structure of the top cover component are complex, the extremely simple assembly is required to be improved, the manufacturing cost is high, the production efficiency is low, particularly, the polar column is easy to rotate, and the axial anti-torsion and anti-tension requirements can not be met; meanwhile, in the assembly and use process of the top cover assembly, the lower insulator is extremely easy to generate position deviation or separation, and cannot be firmly matched and jointed with the top cover sheet, so that the stability of the top cover piece is poor, and the product assembly yield is reduced. In order to prevent the rotation of the lower plastic, the existing methods of processing a groove on the top cover plate, welding a reinforcing protrusion on the lower plastic, or assembling by a snap fit structure provided with a snap structure lock catch are generally adopted, however, the method makes the assembly of the top cover plate and the lower plastic complex, which results in low yield of the top cover piece, higher processing cost and difficulty, and can not meet the requirement of extremely-simple and large-scale assembly of the top cover assembly in engineering.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to solve the technical problems that: the utility model provides a secondary cell top cap subassembly and secondary cell passes through the assembly methods of through-hole fixed connection on the lower plastic part at the blind hole of top cap piece through the mounting, can strengthen top cap intensity, effectively prevents down insulator position offset or drop, through the fixed utmost point post of insulator down, improves top cap subassembly's antitorque tensile ability, keeps stability good.

In order to achieve the technical purpose, the utility model adopts a technical scheme that: the utility model provides a secondary battery top cap subassembly, including the top cap piece that defines upper surface and lower surface, hold in the utmost point post of top cap piece and butt in the lower insulator of top cap piece lower surface, the top cap piece includes from the lower surface of top cap piece is towards a plurality of blind holes that the upper surface was seted up, lower insulator includes respectively with a plurality of the blind holes correspond setting and run through a plurality of through-holes of lower insulator, secondary battery top cap subassembly still includes respectively with a plurality of the blind hole and through-hole correspond a plurality of mounting, each the mounting passes the through-hole of lower insulator in proper order and fixed connection in the blind hole of top cap piece.

Further, the lower insulator is abutted against one side of the top cover sheet, the contact surfaces of the lower insulator and the top cover sheet are abutting surfaces, and the abutting surfaces are a plane, that is, the contact surfaces of the lower insulator and the top cover sheet are all on the same plane, and no convex or concave matching exists between the lower insulator and the top cover sheet.

Further, the connection mode of the fixing piece and the top cover piece can be any one of welding, riveting and threaded connection, and the fixing piece is provided with a fixing piece base and a connecting part.

Further, when the fixing piece and the top cover sheet are in fusion connection, the blind holes of the top cover sheet can be in any uncertain shape, and the number of the blind holes is one or more; when the blind hole formed in the top cover plate is shaped as a special-shaped hole, the blind hole is formed only by a single hole, so that the lower insulator is prevented from rotating.

Further, when the fixing piece and the top cover piece are in fusion connection, a dovetail groove is formed in the inner side of the blind hole of the top cover piece, and the fixing piece is in clearance fit with the dovetail groove through the connecting part of the fixing piece.

Further, the through holes on the lower insulator are arranged concentrically with the blind holes of the top cover sheet, the through holes are arranged corresponding to the positions and the quantity of the blind holes, the section of the inner edge of the blind hole on the top cover sheet is in a diagonal shape, a folded line shape or an S shape, and the diameter of the through holes on the lower insulator is smaller than the size of the base of the fixing piece.

Further, the middle part of the lower insulator is provided with an explosion-proof pressure relief net, a pole perforation is formed at the position of the lower insulator corresponding to the pole, a limit groove wound on the outer edge of the pole perforation is formed on the lower side surface of the lower insulator, and the limit groove is limited by being matched with the pole.

Further, the sealing device comprises an injection molding piece embedded between the top cover plate and the pole, and a sealing piece sleeved on the periphery of the pole, wherein the pole comprises a pole base and a column body, the pole base is abutted to the bottom side of the lower insulator, a first matching part and a second matching part are arranged in the middle section of the column body along the circumferential direction, the injection molding piece is embedded on the first matching part, the sealing piece is sleeved on the second matching part, and the width of the second part is larger than that of the first matching part; the inner wall surface of the top cover sheet is provided with a step structure surface embedded with the injection molding piece and used for being matched with the injection molding piece to fix the pole so as to prevent mutual rotation.

In order to solve the technical problems, the utility model adopts another technical scheme that: provided is a secondary battery including a case, a battery cell accommodated in the case; and a secondary battery top cap assembly including the same.

The secondary battery top cover assembly and the secondary battery have at least the following beneficial effects: the lower insulator assembly is abutted to one side of the bottom end of the top cover sheet facing the battery core, and the abutting surface of the lower insulator and the top cover sheet is set to be a plane, so that the assembling and processing difficulty of the pole, the top cover sheet and the lower insulator is reduced, and the assembling efficiency is improved; through being provided with a plurality of blind hole to bottom one side of electric core on the top cap piece, then correspond on lower insulator and be provided with a plurality of through-holes, be convenient for pass the through-hole fixed firm connection on the lower insulator in the blind hole of top cap piece with the mounting to do benefit to effectively prevent down insulator position deviation or drop, avoid down plastic insulating sealing performance decline, and then utilize down insulator fixed utmost point post, improve top cap assembly's antitorque tensile ability, keep top cap assembly stability. The assembly process can be completed by directly fixing assembly and joint, the process of the back section of the client is convenient, and the assembly yield is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

fig. 1 is a perspective combined view of a top cap assembly of a secondary battery according to the present utility model;

fig. 2 is an exploded perspective view of the top cap assembly of the secondary battery of the present utility model;

fig. 3 is a top view of the top cap assembly of the secondary battery of the present utility model;

FIG. 4 is a cross-sectional view of the cap assembly of FIG. 3 taken along the direction A-A;

FIG. 5 is a cross-sectional view of the header assembly of FIG. 3 taken along the direction B-B;

FIG. 6 is a cross-sectional view of the header assembly of FIG. 3 taken along the direction C-C;

FIG. 7 is a schematic perspective view of the fixing member of FIG. 3;

FIG. 8 is an enlarged schematic view of the assembled structure D of the fastener of FIG. 3;

FIG. 9 is a schematic view of the lower insulator structure of the header assembly of the present utility model;

FIG. 10 is an enlarged schematic view of a partial structure of the through hole of FIG. 8;

FIG. 11 is a schematic view of the pole in FIG. 2;

FIG. 12 is a schematic diagram illustrating the assembly of the pole and the limiting groove in FIG. 2;

fig. 13 is a schematic view showing a partial structure of the contact portion between the lower insulator and the top cover sheet in fig. 4.

The meaning of the reference numerals in the drawings are:

a top sheet-10; a pole mounting hole-11; an upper mating surface-12; liquid injection holes-13 a,13b; a blind hole-14; dovetail grooves-141 and step structural surfaces-15; pole-20; a pole base-21; a column portion-22, a first fitting portion-221; a second mating portion-222; injection molding-30; a seal member-40; lower insulator-50; a through hole-51; through-hole cross section-511; an abutment surface-52; lower insulator perforation-53; limit groove-54; an explosion-proof pressure relief net-55; a first vent-56; a second vent-57; a fixing member-60; a connecting portion-61; a fixture base-62; an explosion-proof valve-70; explosion-proof sheet-71; protecting the patch-72.

Detailed Description

For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

In the embodiment of the present application, referring to fig. 1 to 13, a secondary battery top cap assembly includes at least a top cap sheet 10, a post 20 held to the top cap sheet 10, an injection molding 30, a sealing member 40, and a fixing member 60, and a lower insulator 50.

As shown in fig. 1 to 6, the top cover sheet 10 has a rectangular sheet structure, and the top cover sheet 10 defines an upper surface and a lower surface corresponding to the upper surface. The top cover sheet 10 includes a pole mounting hole 11 penetrating through the top cover sheet 10 and a blind hole 14 opened from the lower surface toward the upper surface of the top cover sheet 10. The top cover sheet 10 has a thickness such that the blind holes 14 do not extend upwardly through the upper surface of the top cover sheet 10.

As shown in fig. 1 to 6, the pole 20 is placed in the pole mounting hole 11, the sealing member 40 is sleeved on the periphery of the pole 20, the injection molding member 30 is embedded between the top cover plate 10 and the pole 20 to fix the pole 20 on the top cover plate 10, so that the pole can be effectively prevented from moving, the torsion-resistant and tensile-resistant capability is improved, and meanwhile, the injection molding member 30 is sealed with the top cover plate 10 and the pole 20 in an insulating manner, and can surround and encircle the outer side of the pole 20, and the injection molding member 30 can be preferably made of insulating plastic materials, so that the electric conduction is prevented, and the injection molding is facilitated; the post mounting hole 11 is located at a lateral end side position of the top cover sheet 10. In practical applications, the pole 20 is usually provided with a first pole and a second pole, the external structures of the first pole and the second pole are the same or similar, and the functions of the first pole and the second pole are the same, the first pole and the second pole can be respectively divided into a positive pole and a negative pole in engineering manufacture, and vice versa, the pole 20 is usually made of copper or copper-aluminum composite materials, preferably, the positive pole is usually made of aluminum pole, the negative pole is made of copper-aluminum composite pole, or both are made of composite pole, and the pole made of aluminum material can reduce the height and the weight of the pole.

As shown in fig. 1 to 6, the lower insulator 50 is located at one side of the lower surface of the bottom end of the top cover 10, the lower insulator 50 is made of an insulating material, the middle part of the lower insulator 50 is protruded outwards to form an explosion-proof pressure relief net 55, the explosion-proof pressure relief net 55 is in a curve oval through hole shape and penetrates through the lower insulator 50, a plurality of first ventilation holes 56 are formed in one side of the explosion-proof pressure relief net 55, limit ribs are respectively arranged at two ends and the middle part of the lower insulator 50, a plurality of second ventilation holes 57 are formed in the limit ribs, and an explosion-proof net structure is arranged on the body of the lower insulator 50, so that the air pressure generated during liquid injection can be prevented from blocking the stroke of an explosion-proof valve; through setting up spacing rib, can avoid taking place to shift when electric core tab welds, through setting up a plurality of bleeder vents 57, can make things convenient for the inside exhaust of electric core to alleviateed part weight, thereby reduction in production cost, and promote battery energy density. In addition, the lower insulator 50 may be composed of a left lower insulator, a right lower insulator, or a first and a second lower insulators, and may be a single sheet-shaped integral lower insulator in this application, and the lower insulator 50 will be described in this application with reference to the first, the second, or the left and the right, single lower insulators.

In this embodiment, referring to the cross-sectional views of fig. 4, 6 and 13, the lower insulator 50 is abutted against one side of the top cover sheet 10, the contact surface between the lower insulator and the top cover sheet is an abutment surface 52, the abutment surface 52 is in flat-surface abutting fit when being abutted against the top cover sheet, and the abutment surface is a plane, that is, the contact surfaces of the lower insulator and the top cover sheet are all on the same plane, that is, the abutting part of the lower insulator and the bottom side of the top cover sheet does not need to be provided with a protrusion, a recess or a reinforcing rib structure, so that the processing procedure of the abutting side of the lower insulator and the top cover sheet is reduced, and the flat-surface abutting fit connection is realized, thereby being convenient for directly aligning and attaching the top cover sheet 10 and the lower insulator 50; optionally, in this embodiment, one end of the lower surface of the top cover sheet 10 is used as the upper mating surface 12 that mates with the lower insulator 50, the lower insulator upper abutting surface 52 is a flat surface, and no various protrusions or grooves are provided, while the upper mating surface 12 of the top cover sheet 10 may be processed into a flat surface or into a non-flat linear surface, and the upper mating surface 12 and the abutting surface 52 are tightly assembled by the fixing member 60, so as to avoid the degradation of the insulating sealing performance of the lower plastic cement. Alternatively, the lower insulator 50 may be injection molded and then assembled with the top cover plate 10 and the pole 20, or the top cover plate 10 and the pole 20 may be assembled, and the lower insulator 50 is injection molded and then integrally formed with the top cover plate 10 and the pole 20, so as to further fasten the top cover plate 10 and the lower insulator 50, and then connect and lock the lower insulator 50 and the top cover plate 10 through the fixing member 60, so as to prevent the lower insulator 50 from deforming and shifting.

Optionally, in this embodiment, the top cover sheet 10, the lower insulator 50, the pole post 20, the injection molding piece 30 and the sealing piece 40 may be assembled by injection molding a top cover, where the pole post 20 penetrates through the lower insulator 50, the sealing piece 40 and the top cover sheet pole post mounting hole 11 in sequence, and is pressed on the top cover sheet 10, and then the injection molding piece 30 is injection molded to fix the pole post 20 on the top cover sheet 10.

In another alternative embodiment, a riveting/welding type top cover can be adopted, the pole 20 penetrates through the sealing piece 40, the top cover piece pole mounting hole 11 and the riveting block riveted on the top cover piece 10 in sequence, the pole 20 is fixed on the top cover piece 10 by riveting/welding with the riveting block, and the pole 20 is insulated with the top cover piece 10 by using an insulator.

In another alternative embodiment, a composite pole top cover structure may be adopted, the pole 20 is first sleeved on the injection molding piece 30 and the sealing piece 40, the injection molding piece 30 is welded with the top cover piece 10 and the pole 20 by laser, then the sealing piece 40 is pressed on the end face of the pole mounting hole 11 of the top cover piece, and then the injection molding piece 30 is formed by injection molding plastic, and finally the lower insulator 50 is assembled.

In this embodiment, with continued reference to fig. 1 to 3 and fig. 7 to 9, the lower insulator 50 in the top cap assembly of the secondary battery abuts against one end of the lower surface of the top cap sheet 10, the one end of the lower surface of the top cap sheet is usually located at the side facing the battery core, the lower insulator 50 is correspondingly provided with a plurality of through holes 51, the fixing piece 60 is fixedly connected in the blind hole 14 of the top cap sheet 10 through the through holes 51 on the lower insulator 50, and the fixing piece 60 mainly plays a role in connection and fixation.

The fixing member 60 may be a bolt, a stud, a screw, a nut, a self-tapping screw, a wood screw, a pin, a rivet, a welding nail, or a corresponding connecting member and assembly, etc., the fixing member 60 stably assembles the lower insulator 50 with the top cover sheet 10, the fixing member is provided with a fixing member base 62 and a connecting portion 61, the connecting portion is located on the fixing member base, when the lower insulator 50 is assembled with the top cover sheet 10, the fixing member base 62 is fixed on the lower insulator 50, and the connecting portion extends inside the blind hole to prevent the lower insulator 50 from rotating or falling off relative to the top cover sheet 10.

In the embodiment of the present application, with continued reference to fig. 2 to 4 and fig. 7 to 8, the fixing member 60 and the top cover sheet 10 may be welded, rivet, screwed, fastened, and connected to each other, so as to fix the relative positions of the top cover sheet 10 and the lower insulator 50, and make them assembled into a whole; when the fixing member 60 is in fusion connection with the top cover sheet 10, the blind holes of the top cover sheet 10 may be in any indeterminate shape, the number of the blind holes 14 is one or more, and when the blind holes 14 formed in the top cover sheet 10 are in special-shaped holes, the blind holes 14 may be formed in a single hole or multiple holes so as to prevent the lower insulator from rotating; when in fusion connection, the inner side of the blind hole of the top cover sheet is provided with a dovetail groove, one side of the fixing piece is provided with a connecting bulge, the fixing piece can be fixedly connected to the top cover sheet in a clearance fit manner through the connecting part and the dovetail groove, and preferably, the fusion connection mode of the embodiment generally adopts hot fusion connection; when the fixing piece 60 is welded to the top cover sheet 10, a welding groove is formed along the inner side of the blind hole 14 of the top cover sheet 10, a welding rib is machined on one side of the fixing piece 60, the fixing piece 60 can be welded to the top cover sheet 10 through the fit of the welding rib and the welding groove, and the welding mode can be laser welding, ultrasonic welding, penetrating welding and the like, in this embodiment, the laser welding is preferably adopted, so that unnecessary metal scraps are avoided from being generated, and the safety of the battery cell is not affected; when the fixing piece 60 is connected with the top cover sheet 10 by rivet pulling, the fixing piece 60 is a rivet pulling, and the rivet pulling passes through the lower insulator through hole to be fixed on the corresponding top cover sheet blind hole 14 by the drawing action of the rivet pulling, and the proper rivet pulling model and specification are adapted according to the size specification of the top cover sheet blind hole 14 and the lower insulator upper through hole 51, so that the connection is firm and reliable; when the fixing member 60 is in threaded connection with the top cover sheet 10, the threaded connection mode is any of common bolt connection, twisted hole bolt connection and stud connection, and when in threaded connection, stud connection is preferably adopted, that is, the number of the top cover sheet blind holes 14 and the number of the lower insulator through holes 51 are at least two correspondingly; alternatively, in the present embodiment, the fastening means is not limited to the above-mentioned ones, and the fitting fastening means is adjusted according to the actual engineering.

In this embodiment, referring to fig. 2, 4, 7, 8, and 10, the lower through holes on the insulator are concentrically disposed with the blind holes of the top cover sheet, the number and positions of the through holes 51 are in one-to-one correspondence with those of the blind holes 14, the through holes are disposed corresponding to the positions and numbers of the blind holes, the inner edge section of the blind holes on the top cover sheet can be selected to be diagonal, folded or S-shaped according to different mechanical fastening modes of the fixing member, the inner section of the corresponding through hole 51 can also be diagonal, folded or S-shaped, the radial dimension of the lower through hole 51 on the insulator is adapted to the bottom side of the fixing member 60, the diameter of the through hole 51 on the lower insulator is smaller than the dimension of the base 62 of the fixing member, the fastening cooperation between the fixing member 60 and the blind holes 14 is achieved, the dimension of the fixing member 60 is substantially level with the thickness of the top cover sheet 10, so as to minimize the occupied space of the cell structure and increase the cell capacity.

In this embodiment, referring to fig. 9, 11 and 12, the pole 20 includes a pole base 21 and a column 22, where the pole base 21 is sleeved on the pole mounting hole 11 of the lower insulator 50, the column 22 passes through the top cover piece pole mounting hole 11 upwards in the axial direction and is exposed on the upper end side surface of the top cover piece 10, the lower insulator 50 separates the pole base 21 from the top cover piece 10 in the axial direction, the pole base 21 may be configured as a square or circular structure, the lower insulator limiting groove 54 is adapted to the external shape structure of the base, the column 22 is circumferentially provided with a first and a second matching parts 221 and 222, the first matching part 221 is provided with a pattern with a regular shape so as to be better matched with the injection molding piece 30 and the top cover piece pole mounting hole 11, the injection molding piece 30 is embedded on the matching part, the seal piece 40 is sleeved on the pole base 21, the pole base 21 is separated from the top cover piece mounting hole 11 in the axial direction, the outer edge of the seal piece 40 is matched with the inner edge 53 of the lower insulator 50, and the first matching part 40 is matched with the second matching part 222 in a tight width, and the second matching part 222 is matched with the first matching part is matched with the second matching part 222; the step structural surface embedded with the injection molding piece is arranged on the inner wall surface of the top cover sheet so as to play a role in anti-rotation matching, and the lower insulator 50 is provided with a limit groove 54 for fixing a pole base, preventing the pole from shifting and realizing the purpose of preventing the top cover assembly from rotating between the structures. Correspondingly, the top cover sheet 10 is provided with an injection molding piece 30, a pole mounting hole 11, a sealing piece 40 and the like which are matched with the first pole and the second pole, wherein the sealing piece 40 is sleeved on the bottom edge side of the pole mounting hole 11 and fixedly sealed on the main body part of the pole 20, the inner diameter of the sealing piece 40 is the same as the outer diameter of the sealing piece matching part of the pole, the outer diameter of the sealing piece 40 is slightly larger than the diameter of the pole mounting hole 11 on the top cover sheet 10, the liquid escape or gas leakage is effectively prevented, the sealing piece 40 can be an elastic rubber sealing ring, a metal sealing ring and the like which act axially, the sealing piece can be used for non-pressure sealing on the outer side of the pole 20, and the sealing piece can be in the shape of an O-shaped sealing circle series, a Y-shaped sealing circle, a V-shaped sealing circle, a hole YX-shaped sealing circle, a YX-shaped hole blocking circle and the like.

In this embodiment of the present application, with continued reference to fig. 2, the top cover assembly is further provided with liquid injection holes 13a,13b and an explosion-proof structural member, the explosion-proof structural member includes an explosion-proof valve 70 and an explosion-proof piece 71, the explosion-proof valve 70 is opened on the top cover piece 10, the explosion-proof valve 70 is located at a middle side of the top cover piece 10, the explosion-proof piece 71 is used for sealing an explosion-proof valve port and is fixed on the top cover piece 10, an explosion-proof notch is formed on the explosion-proof piece 71, when a battery is abnormal, when the internal pressure increases and exceeds the opening pressure of the explosion-proof valve 70, the explosion-proof valve 70 will rupture from the notch and open to release pressure so as to play a role of explosion-proof pressure release, an explosion-proof piece protection patch 72 is further provided above the explosion-proof piece 71, when the battery is abnormal, the internal air pressure increases to a certain value, the top cover explosion-proof valve 10 will open to release pressure, and reduce explosion risk; the liquid injection hole 13 is positioned on one side of the explosion-proof valve 10, the shape and position of the lower insulator liquid injection hole 13b are correspondingly arranged with the top cover piece liquid injection hole 13a, the liquid injection holes 13a and 13b are convenient for injecting electrolyte into the battery core, the liquid injection hole 13a on the top cover piece 10 is required to be sealed after the battery is injected, the battery core is isolated from the external environment, the chemical environment required by the battery operation is ensured, the electrolyte leakage is prevented, and optionally, the liquid injection holes 13a and 13b are sealed by sealing nails.

The utility model also discloses a secondary battery in this application, including casing, electric core, its electric core is held in the casing to and including the secondary battery top cap subassembly in the preceding embodiment, top cap subassembly and casing lid are integrated into one piece, make the electric core seal in the lid space that top cap subassembly and casing constitute intact.

According to the secondary battery cell top cover assembly and the secondary battery, the lower insulator 50 is abutted against the bottom end side of the lower surface of the top cover plate 10 facing the battery cell, and the abutting surface of the lower insulator 50 and the top cover plate 10 is set to be a plane, so that the assembly processing difficulty of a pole, the top cover plate 10 and the lower insulator 50 is reduced, and the assembly efficiency is improved; through being provided with a plurality of blind hole 14 towards the bottom one side of electric core on top cap piece 10, then be provided with a plurality of through-holes 51 on insulator 50 down correspondingly, be convenient for pass the through-hole 51 fixed firm connection on the insulator down in the blind hole 14 of top cap piece to be favorable to preventing effectively that insulator position skew or drop down, the insulating sealing performance of plastic down is reduced, keeps top cap subassembly stability down.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The utility model provides a secondary battery top cap subassembly, includes the top cap piece that defines upper surface and lower surface, hold in the utmost point post of top cap piece and butt in the lower insulator of top cap piece lower surface, its characterized in that, the top cap piece includes from the lower surface of top cap piece is towards a plurality of blind holes that the upper surface was seted up, lower insulator includes respectively with a plurality of the blind holes correspond setting and run through a plurality of through-holes of lower insulator, secondary battery top cap subassembly still includes respectively with a plurality of blind holes and through-hole correspond a plurality of mounting, each the mounting passes the through-hole of lower insulator in proper order and fixed connection in the blind hole of top cap piece.

2. The secondary battery top cap assembly according to claim 1, wherein: the lower insulator is abutted against one side of the top cover plate, the contact surface of the lower insulator and the top cover plate is an abutting surface, and the abutting surface is a plane.

3. The secondary battery top cap assembly according to claim 1 or 2, wherein: the connecting mode of the fixing piece and the top cover piece can be any one of welding, riveting and threaded connection, and the fixing piece is provided with a fixing piece base and a connecting part.

4. The secondary battery top cap assembly according to claim 3, wherein: when the fixing piece and the top cover sheet are in fusion connection, the blind holes of the top cover sheet can be in any uncertain shape, and the number of the blind holes is one or more.

5. The secondary battery top cap assembly according to claim 4, wherein: when the blind hole formed in the top cover plate is shaped like a special-shaped hole, the blind hole is formed in a single or multiple openings so as to prevent the lower insulator from rotating.

6. The secondary battery top cap assembly according to claim 3, wherein: when the fixing piece and the top cover piece are in fusion connection, a dovetail groove is formed in the inner side of the blind hole of the top cover piece, and the fixing piece is in clearance fit with the dovetail groove through the connecting part of the fixing piece.

7. The secondary battery top cap assembly according to claim 3, wherein: the upper through hole of the lower insulator and the blind hole of the top cover sheet are concentrically arranged, the through holes are correspondingly arranged in position and quantity of the blind holes, the section of the inner edge of the blind hole of the top cover sheet is oblique line-shaped, folded line-shaped or S-shaped, and the diameter of the upper through hole of the lower insulator is smaller than the size of the base of the fixing piece.

8. The secondary battery top cap assembly according to claim 1, wherein: the middle part of the lower insulator is provided with an explosion-proof pressure relief net, a pole perforation is formed at the position of the lower insulator corresponding to the pole, a limit groove wound on the outer edge of the pole perforation is formed on the lower side surface of the lower insulator, and the limit groove is in limit with the pole in a matched mode.

9. The secondary battery top cap assembly according to claim 1, wherein: the pole comprises a pole base and a column body, wherein the pole base is abutted to the bottom side of a lower insulator, a first matching part and a second matching part are arranged in the middle section of the column body along the circumferential direction, the injection molding piece is embedded on the first matching part, the sealing piece is sleeved on the second matching part, and the width of the second matching part is larger than that of the first matching part; the inner wall surface of the top cover sheet is provided with a step structure surface embedded with the injection molding piece and used for being matched with the injection molding piece to fix the pole so as to prevent mutual rotation.

10. A secondary battery characterized in that: comprising a housing, a battery cell accommodated in the housing, and the secondary battery top cap assembly according to any one of claims 1 to 9.