阅读说明：本技术 锂电池顶盖组件及二次电池 (Lithium battery top cover assembly and secondary battery ) 是由 陈中元 于 2021-07-16 设计创作，主要内容包括：本发明公开了一种锂电池顶盖组件,包括：顶盖板；第一电极端子与第二电极端子；下部绝缘支架；第一固定件与第二固定件。在该第一固定件上成型的第一胶体由上至下依次贯穿第一电极端子的让位侧槽与第一过胶缝隙,并与下部绝缘支架连接于一体,同时,在该第一固定件上成型的数个第一咬合胶体嵌入顶盖板咬花凹槽内；在该第二固定件上成型的第二胶体由上至下依次贯穿第二电极端子的让位侧槽与第二过胶缝隙,并与下部绝缘支架连接于一体,同时,在该第二固定件上成型的数个第二咬合胶体嵌入顶盖板咬花凹槽内,形成一体式密封结构。本发明还公开了上述锂电池顶盖组件的注塑装配方法。(The invention discloses a lithium battery top cover assembly, which comprises: a top cover plate; a first electrode terminal and a second electrode terminal; a lower insulating support; the first fixing piece and the second fixing piece. The first colloid formed on the first fixing piece sequentially penetrates through the abdicating side groove of the first electrode terminal and the first glue passing gap from top to bottom and is connected with the lower insulating bracket into a whole, and meanwhile, a plurality of first meshing colloids formed on the first fixing piece are embedded into the meshing grooves of the top cover plate; the second colloid formed on the second fixing piece sequentially penetrates through the yielding side groove of the second electrode terminal and the second glue passing gap from top to bottom and is connected with the lower insulating support into a whole, and meanwhile, a plurality of second meshing colloids formed on the second fixing piece are embedded into the undercut grooves of the top cover plate to form an integrated sealing structure. The invention also discloses an injection molding assembly method of the lithium battery top cover assembly.)

1. A lithium battery header assembly, comprising:

the top cover plate is provided with a plurality of top cover plate undercut grooves;

the first electrode terminal and the second electrode terminal are respectively arranged on the top cover plate, a plurality of gear teeth are respectively formed on the peripheries of the first electrode terminal and the second electrode terminal, a abdicating side groove avoiding the undercut groove of the top cover plate is respectively formed between every two adjacent gear teeth, a first glue passing gap is formed between the first electrode terminal and the top cover plate, and a second glue passing gap is formed between the second electrode terminal and the top cover plate;

a lower insulating support disposed below the top cover plate;

the first fixing piece is arranged on the top cover plate, a first colloid formed on the first fixing piece sequentially penetrates through the abdicating side groove and the first glue passing gap of the first electrode terminal from top to bottom and is connected with the lower insulating support into a whole, and meanwhile, a plurality of first meshing colloids formed on the first fixing piece are embedded into the meshing grooves of the top cover plate;

the second fixing piece is arranged on the top cover plate, a second colloid formed on the second fixing piece sequentially penetrates through the yielding side groove of the second electrode terminal and the second glue passing gap from top to bottom and is connected with the lower insulating support into a whole, and meanwhile, a plurality of second meshing colloids formed on the second fixing piece are embedded into the undercut groove of the top cover plate to form an integrated sealing structure.

2. The lithium battery cap assembly of claim 1, wherein an annular terminal plate is formed at the periphery of the first electrode terminal, a terminal protrusion is protruded from the lower end surface of the first electrode terminal, the plurality of teeth of the first electrode terminal are uniformly distributed on the outer side of the annular terminal plate, and the second electrode terminal has the same structure as the first electrode terminal.

3. The lithium battery cell cap assembly of claim 1, wherein the cap plate undercut recess is an inverted cone shaped structure.

4. The lithium battery top cap assembly of claim 1, wherein the plurality of top cap plate knurl grooves are formed on the upper and lower surfaces of the top cap plate.

5. The lithium battery cap assembly of claim 2, wherein two mounting locations for mounting the first electrode terminal and the second electrode terminal, respectively, are formed on the cap plate, a terminal leading-out hole for leading out the terminal convex part is respectively formed on the two mounting positions, a top cover plate sinking part is formed at the periphery of the terminal leading-out hole, the plurality of undercut grooves of the top cover plate are distributed on the sinking part of the top cover plate, the annular terminal plate is arranged on the sinking part of the top cover plate, the first glue gap is formed between the annular terminal plate of the first electrode terminal and the sunken part of the top cover plate, and between the outer wall of the terminal bulge part of the first electrode terminal and the inner wall of the terminal lead-out hole, and second adhesive gaps are formed between the annular terminal plate of the second electrode terminal and the sunken part of the top cover plate and between the outer wall of the terminal protruding part of the second electrode terminal and the inner wall of the terminal leading-out hole.

6. The lithium battery top cover assembly according to claim 5, wherein two insulation support through holes corresponding to the terminal lead-out holes one to one are formed in the lower insulation support, and a plurality of insulation support special-shaped grooves are formed at the periphery of the insulation support through holes; a plurality of fixing piece special-shaped convex blocks clamped in the insulating support special-shaped grooves are respectively formed on the outer sides of the lower parts of the first fixing piece and the second fixing piece; the first glue body is correspondingly connected with the plurality of fixing part special-shaped lugs on the first fixing part, and the second glue body is correspondingly connected with the plurality of fixing part special-shaped lugs on the second fixing part.

7. The lithium battery top cap assembly of claim 1, wherein an explosion-proof valve mounting hole is formed at the top cap plate, an annular mounting groove is formed at a lower end surface of the top cap plate to be positioned at a periphery of the explosion-proof valve mounting hole, an explosion-proof valve is disposed in the annular mounting groove, and a protective film is disposed on the explosion-proof valve mounting hole; and an explosion-proof valve protection cover corresponding to the explosion-proof valve is arranged on the lower insulating support.

8. The injection molding assembly method for a lithium battery top cover assembly according to any one of claims 1 to 7, comprising the steps of:

(1) punching a plurality of straight holes of the top cover plate on the top cover plate, and performing plane punching on the top cover plate to ensure that the surface orifices of the straight holes of the top cover plate are contracted due to secondary punching to form inverted cone-shaped undercut grooves of the top cover plate;

(2) punching a plurality of gear teeth on the peripheries of the first electrode terminal and the second electrode terminal respectively; then, carrying out lathe process to carry out the step thickness lathing and trimming processing of the terminal board;

(3) welding the explosion-proof valve on the bottom surface of the explosion-proof valve mounting hole of the top cover plate;

(4) assembling a first electrode terminal to an upper surface of a top cap plate; meanwhile, a second electrode terminal is taken to be assembled to the upper surface of the top cover plate;

(5) placing the assembled integral top cover assembly on the lower insulating support in a mold, then performing an injection molding process, forming a first fixing piece on the top cover plate and corresponding to the position of the first electrode terminal, sequentially penetrating a yielding side groove of the first electrode terminal and a first glue passing gap from top to bottom, connecting the first fixing piece and the lower insulating support into a whole, and simultaneously embedding a plurality of first meshing colloids formed on the first fixing piece into a meshing groove of the top cover plate; forming a second fixing piece on the top cover plate and corresponding to the position of the second electrode terminal, sequentially penetrating a yielding side groove and a second glue passing gap of the second electrode terminal on the second fixing piece from top to bottom, and connecting the second glue passing gap and a lower insulating support into a whole;

wherein, the steps (1) and (2) are not in sequence, and the steps (3), (4) and (5) are not in sequence.

Technical Field

The present disclosure relates to a secondary battery, and particularly to a lithium battery and a secondary battery.

Background

The development and utilization of secondary batteries are related to the continuous development of new energy technology, and the development and utilization of electric power as clean energy at the present stage is a long-term strategic target.

In the process of assembling and packaging the secondary battery, the traditional packaging cover plate component and the corresponding assembling method have certain defects, the cover plate component is packaged only by virtue of a sealing ring, and the sealing performance of the liquid in the secondary battery is poor.

Meanwhile, the structure and the assembly process of the pole are complex, so that the assembly efficiency of the secondary lithium battery is affected, and after the pole is fixed on the top cover plate, the pole is often disconnected from the top cover plate due to insufficient fixing force, so that the use reliability of the secondary battery is reduced.

Therefore, a new lithium battery cap assembly and secondary battery are needed.

Disclosure of Invention

In view of the above disadvantages, an object of the present invention is to provide a lithium battery top cap assembly and a secondary battery thereof, which not only improve the sealing performance after a first electrode terminal and a second electrode terminal are assembled on a top cap plate, increase the combination stability between structures, increase the fixing strength, improve the product performance, and improve the product use reliability; moreover, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.

The technical scheme adopted by the invention to achieve the aim is as follows:

a lithium battery header assembly, comprising:

the top cover plate is provided with a plurality of top cover plate undercut grooves;

the first electrode terminal and the second electrode terminal are respectively arranged on the top cover plate, a plurality of gear teeth are respectively formed on the peripheries of the first electrode terminal and the second electrode terminal, a abdicating side groove avoiding the undercut groove of the top cover plate is respectively formed between every two adjacent gear teeth, a first glue passing gap is formed between the first electrode terminal and the top cover plate, and a second glue passing gap is formed between the second electrode terminal and the top cover plate;

a lower insulating support disposed below the top cover plate;

the first fixing piece is arranged on the top cover plate, a first colloid formed on the first fixing piece sequentially penetrates through the abdicating side groove and the first glue passing gap of the first electrode terminal from top to bottom and is connected with the lower insulating support into a whole, and meanwhile, a plurality of first meshing colloids formed on the first fixing piece are embedded into the meshing grooves of the top cover plate;

the second fixing piece is arranged on the top cover plate, a second colloid formed on the second fixing piece sequentially penetrates through the yielding side groove of the second electrode terminal and the second glue passing gap from top to bottom and is connected with the lower insulating support into a whole, and meanwhile, a plurality of second meshing colloids formed on the second fixing piece are embedded into the undercut groove of the top cover plate to form an integrated sealing structure.

As a further improvement of the present invention, an annular terminal plate is formed on the periphery of the first electrode terminal, and a terminal protrusion is convexly disposed on the lower end surface of the first electrode terminal, and a plurality of gear teeth on the first electrode terminal are uniformly distributed on the outer side edge of the annular terminal plate; the second electrode terminal has the same structure as the first electrode terminal.

As a further improvement of the invention, the undercut groove of the top cover plate is of an inverted cone structure.

As a further improvement of the invention, the plurality of the top cover plate undercut grooves are formed on the upper surface and the lower surface of the top cover plate.

As a further improvement of the present invention, two mounting positions for respectively mounting the first electrode terminal and the second electrode terminal are formed on the top cover plate, a terminal lead-out hole for leading out the terminal protrusion is formed on each of the two mounting positions, a top cover plate sinking portion is formed at the periphery of the terminal lead-out hole, the plurality of top cover plate undercut grooves are distributed on the top cover plate sinking portion, the annular terminal plate is arranged on the top cover plate sinking portion, the first glue passing gap is formed between the annular terminal plate of the first electrode terminal and the top cover plate sinking portion, and between the outer wall of the terminal protrusion of the first electrode terminal and the inner wall of the terminal lead-out hole, and the second glue passing gap is formed between the annular terminal plate of the second electrode terminal and the top cover plate sinking portion, and between the outer wall of the terminal protrusion of the second electrode terminal and the inner wall of the terminal lead-out hole.

As a further improvement of the invention, two insulation support through holes corresponding to the terminal leading-out holes one by one are formed on the lower insulation support, and a plurality of insulation support special-shaped grooves are formed at the periphery of the insulation support through holes; a plurality of fixing piece special-shaped convex blocks clamped in the insulating support special-shaped grooves are respectively formed on the outer sides of the lower parts of the first fixing piece and the second fixing piece; the first glue body is correspondingly connected with the plurality of fixing part special-shaped lugs on the first fixing part, and the second glue body is correspondingly connected with the plurality of fixing part special-shaped lugs on the second fixing part.

As a further improvement of the invention, an explosion-proof valve mounting hole is formed on the top cover plate, an annular mounting groove located at the periphery of the explosion-proof valve mounting hole is formed on the lower end surface of the top cover plate, an explosion-proof valve is arranged in the annular mounting groove, and a protective film is arranged on the explosion-proof valve mounting hole; and an explosion-proof valve protection cover corresponding to the explosion-proof valve is arranged on the lower insulating support.

The injection molding assembly method of the lithium battery top cover component is characterized by comprising the following steps:

(1) punching a plurality of straight holes of the top cover plate on the top cover plate, and performing plane punching on the top cover plate to ensure that the surface orifices of the straight holes of the top cover plate are contracted due to secondary punching to form inverted cone-shaped undercut grooves of the top cover plate;

(2) punching a plurality of gear teeth on the peripheries of the first electrode terminal and the second electrode terminal respectively; then, carrying out lathe process to carry out the step thickness lathing and trimming processing of the terminal board;

(3) welding the explosion-proof valve on the bottom surface of the explosion-proof valve mounting hole of the top cover plate;

(4) assembling a first electrode terminal to an upper surface of a top cap plate; meanwhile, a second electrode terminal is taken to be assembled to the upper surface of the top cover plate;

(5) placing the assembled top cover assembly on the lower insulating support in a mold, then performing an injection molding process, forming a first fixing piece on the top cover plate and corresponding to the position of the first electrode terminal, sequentially penetrating a first colloid formed on the first fixing piece through a yielding side groove of the first electrode terminal and a first glue passing gap from top to bottom, connecting the first colloid with the lower insulating support into a whole, and simultaneously embedding a plurality of first meshing colloids formed on the first fixing piece into a meshing groove of the top cover plate; forming a second fixing piece on the top cover plate and corresponding to the position of the second electrode terminal, sequentially penetrating a yielding side groove and a second glue passing gap of the second electrode terminal on the second fixing piece from top to bottom, and connecting the second glue passing gap and a lower insulating support into a whole;

wherein, the steps (1) and (2) are not in sequence, and the steps (3), (4) and (5) are not in sequence.

The invention has the beneficial effects that:

(1) according to the lithium battery top cover component provided by the invention, the first colloid formed on the first fixing piece penetrates through the abdicating side groove and the first glue passing gap, the second colloid formed on the second fixing piece penetrates through the abdicating side groove and the second glue passing gap, and meanwhile, the plurality of first engaging colloids formed on the first fixing piece and the plurality of second engaging colloids formed on the second fixing piece are respectively embedded into the undercut grooves of the top cover plate, so that the first electrode terminal, the second electrode terminal and the top cover plate are fixedly connected into a whole, and the first electrode terminal and the top cover plate and the second electrode terminal and the top cover plate are isolated and insulated to form an integrated sealing structure. Therefore, the sealing performance of the first electrode terminal and the second electrode terminal after being assembled on the top cover plate is improved, the combination stability between structures is improved, the fixing strength is increased, the product performance is improved, and the use reliability of the product is improved; and the structure is simplified because the structure is simplified, thereby being beneficial to simplifying the assembly process, improving the assembly efficiency and reducing the production cost.

(2) Through stinging the colored recess to set the back taper structure with the lamina tecti, specific do, the lamina tecti is stinged colored recess and is greater than the structural design of head diameter for blind hole bottom diameter, is favorable to the interlock colloid to imbed after stinging colored recess, can increase the pulling force between first mounting and the first electrode terminal, and between second mounting and the second electrode terminal to improve the steadiness that each structure combines.

(3) According to the injection molding assembly method of the lithium battery top cover assembly, provided by the invention, all the parts are assembled together, and finally, one-time injection molding is carried out through an injection molding process, and the first electrode terminal and the second electrode terminal are tightly fixed on the top cover plate through the formed first fixing piece and the second fixing piece respectively, so that an integrated sealing structure is formed. Therefore, the assembly process is greatly simplified, the assembly efficiency is improved, and the production cost is reduced; and the leakproofness of first electrode terminal after assembling on the lamina tecti respectively with the second electrode terminal has been improved, has increased the combination stability between the structure, and the fixed dynamics of increase promotes and produces the property ability, improves product reliability in utilization.

(4) According to the secondary battery provided by the invention, the shell, the electrode assembly arranged in the shell and the lithium battery top cover assembly which is arranged on the shell and is electrically connected to the electrode assembly and comprises any one of claims 1 to 9 are arranged, so that the lithium battery top cover assembly covers the opening arranged in the shell, the problem of liquid leakage in the shell of the secondary battery is effectively prevented, the stability and the sealing performance of the secondary battery are improved, and the reliability and the safety of the battery are further improved.

The above is an overview of the technical solutions of the present invention, and the present invention is further described below with reference to the accompanying drawings and the detailed description thereof.

Drawings

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

FIG. 2 is a partial exploded assembly view of the first embodiment;

FIG. 3 is a rear view of the explosion according to the first embodiment;

FIG. 4 is a schematic view of the overall structure of the present invention;

FIG. 5 is an overall cross-sectional view of the present invention;

FIG. 6 is an enlarged view of portion A;

FIG. 7 is a sectional view of part B;

FIG. 8 is a schematic structural diagram of a second electrode terminal according to an embodiment;

FIG. 9 is a cross-sectional view of a second electrode terminal according to an embodiment;

FIG. 10 is an overall view of a top cover plate according to the embodiment;

FIG. 11 is a partial schematic view of a first seal disposed on a top cover plate according to an embodiment;

FIG. 12 is a rear view of a top cover plate according to one embodiment;

FIG. 13 is an enlarged view of section C;

FIG. 14 is a schematic structural view of a first fastening member according to an embodiment;

fig. 15 is an overall configuration diagram of the second embodiment.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purposes, the following detailed description of the embodiments of the present invention is provided with the accompanying drawings and the preferred embodiments.

Example one

Referring to fig. 1 to 14, an embodiment of the invention provides a lithium battery top cap assembly, including:

a top cover plate 1, in which a plurality of top cover plate undercut grooves 12 are formed on the top cover plate 1, as shown in fig. 10 to 13;

a first electrode terminal 4 and a second electrode terminal 5, wherein the first electrode terminal 4 and the second electrode terminal 5 are respectively disposed on the top cover plate 1, a plurality of gear teeth (41,51) are respectively formed on the peripheries of the first electrode terminal 4 and the second electrode terminal 5, a yielding side groove (42,52) avoiding the undercut groove 12 of the top cover plate is respectively formed between every two adjacent gear teeth (41,51), a first glue passing gap 43 is formed between the first electrode terminal 4 and the top cover plate 1, and a second glue passing gap 53 is formed between the second electrode terminal 5 and the top cover plate 1, as shown in fig. 1 and 4; the structure of the yielding side grooves (42,52) is set to yield the colloid, so that the colloid can smoothly enter the first glue passing gap 43 and the second glue passing gap 53 and enter the colloid of the first glue passing gap 43 and the second glue passing gap 53, the first electrode terminal 4, the second electrode terminal 5 and the top cover plate 1 are fixedly connected into a whole, and the first electrode terminal 4 and the top cover plate 1 and the second electrode terminal 5 and the top cover plate 1 are separated and insulated;

a lower insulating support 6 disposed below the top cover plate 1;

a first fixing member 7 disposed on the top cover plate 1, wherein a first adhesive 71 formed on the first fixing member 7 sequentially penetrates through the receding side groove 42 and the first adhesive passing gap 43 of the first electrode terminal 4 from top to bottom and is integrally connected to the lower insulating support 6, and a plurality of first engaging adhesives 72 formed on the first fixing member 7 are embedded into the top cover plate engaging groove 12, as shown in fig. 5 to 7;

a second fixing member 8 disposed on the top cover plate 1, wherein a second adhesive 81 formed on the second fixing member 8 sequentially penetrates through the receding side groove 52 and the second adhesive gap of the second electrode terminal 5 from top to bottom, and is integrally connected to the lower insulating support 6, and a plurality of second engaging adhesives 82 formed on the second fixing member 8 are embedded into the undercut groove 12 of the top cover plate to form an integral sealing structure, as shown in fig. 5 to 7.

The first colloid 71 formed on the first fixing member 7 penetrates through the abdicating side groove 42 and the first glue passing gap 43, the second colloid 81 formed on the second fixing member 8 penetrates through the abdicating side groove 52 and the second glue passing gap 53, meanwhile, the plurality of first meshing colloids 72 formed on the first fixing member 7 and the plurality of second meshing colloids 82 formed on the second fixing member 8 are respectively embedded into the ceiling plate meshing groove 12, so that the first electrode terminal 4, the second electrode terminal 5 and the ceiling plate 1 are fixedly connected into a whole, and the first electrode terminal 4 and the ceiling plate 1 and the second electrode terminal 5 and the ceiling plate 1 are isolated from each other to form an integrated sealing structure. Therefore, the sealing performance of the first electrode terminal 4 and the second electrode terminal 5 after being assembled on the top cover plate 1 is improved, the combination stability between structures is improved, the fixing strength is increased, the product performance is improved, and the use reliability of the product is improved; and the structure is simplified because the structure is simplified, thereby being beneficial to simplifying the assembly process, improving the assembly efficiency and reducing the production cost.

Preferably, in this embodiment, at least one position-limiting slot (44, 54) is formed on the lower end surface of each of the first electrode terminal 4 and the second electrode terminal 5, as shown in fig. 5. In the assembling process, the limiting clamping grooves (44 and 54) are clamped with the mold together to limit the first electrode terminal 4 and the second electrode terminal 5, so that the phenomenon that the undercut groove 12 of the top cover plate is shielded due to the rotation of the first electrode terminal 4 and the second electrode terminal 5 to influence the injection molding process of the colloid is avoided, and therefore the accuracy and the efficiency of the injection molding process are improved.

As for the specific structure of the first electrode terminal 4 and the second electrode terminal 5, as shown in fig. 5, a first annular terminal plate 45 is formed on the periphery of the first electrode terminal 4, a first terminal protrusion 46 is convexly disposed on the lower end surface of the first electrode terminal 4, a plurality of first gear teeth 41 on the first electrode terminal 4 are uniformly distributed on the outer side of the first annular terminal plate 45, and a limiting clamping groove 44 on the lower end surface of the first electrode terminal 4 is disposed on the lower end surface of the first terminal protrusion 46; the second electrode terminal 5 has the same structure as the first electrode terminal 4, a second annular terminal plate 55 is formed on the periphery of the second electrode terminal 5, a second terminal protrusion 56 is convexly arranged on the lower end surface of the second electrode terminal 5, a plurality of second gear teeth 51 on the second electrode terminal 5 are uniformly distributed on the outer side of the second annular terminal plate 55, and a limiting clamping groove 54 on the lower end surface of the second electrode terminal 5 is arranged on the lower end surface of the second terminal protrusion 56.

In the present embodiment, the first electrode terminal 4 is a positive electrode post, and the second electrode terminal 5 is a negative electrode post. The shapes of the first electrode terminal 4 and the second electrode terminal 5 may be circular, square, polygonal, elliptical, irregular, etc., but are not limited to these shapes.

In this embodiment, the first electrode terminal 4 is a positive electrode post, and the material used is aluminum. The second electrode terminal 5 is a negative electrode post. The cathode pole is made of a copper-aluminum composite integrated material, and is specifically formed by stamping the copper-aluminum composite material. Compared with the traditional mode of combining the aluminum block and the copper block which are well manufactured by adopting a friction welding mode, the copper-aluminum composite material is directly punched, so that the production efficiency can be improved, the equipment cost is reduced, the condition of poor combination is reduced, and the product yield is improved.

In the present embodiment, the undercut groove 12 is formed in an inverted cone shape. Specifically, the undercut groove 12 of the top cover plate is a structural design in which the diameter of the bottom of the blind hole is larger than that of the head, so that after the undercut colloid is embedded into the undercut groove, the tensile force between the first fixing member 7 and the first electrode terminal 4 and between the second fixing member 8 and the second electrode terminal 5 can be increased, and the stability of combination of the structures is improved.

In the present embodiment, the ceiling plate undercut groove 12 has an inverted cone-shaped blind hole structure, and the shape of the ceiling plate undercut groove 12 may be circular, square, oval, triangular, irregular, and the like, but is not limited to these shapes.

In the present embodiment, the plurality of cover plate undercut grooves 12 are formed on the upper surface and the lower surface of the cover plate 1, as shown in fig. 10 to 13, the plurality of cover plate undercut grooves 12 are annularly and tightly distributed. The surface bonding tightness of the first fixing member 7 and the first electrode terminal 4 and the surface bonding tightness of the second fixing member 8 and the second electrode terminal 5 can be further improved by the annular and tightly distributed inverted conical undercut grooves.

As for the specific structure of the top cover plate 1, as shown in fig. 10 to 13, two mounting positions 10 for mounting the first electrode terminal 4 and the second electrode terminal 5 are formed on the top cover plate 1, a terminal lead-out hole 13 for leading out the terminal protrusion 46 is formed on the two mounting positions 10, a top cover plate sinking portion 14 is formed at the periphery of the terminal lead-out hole 13, the plurality of top cover plate undercut grooves 12 are distributed on the top cover plate sinking portion 14, as shown in fig. 5, 6 and 14, the annular terminal plate 45 is arranged on the top cover plate sinking portion 14, the first glue passing gap 43 is formed between the annular terminal plate 45 of the first electrode terminal 4 and the top cover plate sinking portion 14, and between the outer wall of the terminal protrusion 46 of the first electrode terminal 4 and the inner wall of the terminal lead-out hole 13, the annular terminal plate of the second electrode terminal 5 and the top cover plate sinking portion 14, And the second adhesive gap 53 is formed between the outer wall of the terminal protrusion of the second electrode terminal 5 and the inner wall of the terminal lead-out hole 13. After the colloid passes through the yielding side grooves (42 and 52), the colloid enters the first gluing gap 43 and the second gluing gap 53, so that the first electrode terminal 4, the second electrode terminal 5 and the top cover plate 1 are fixedly connected into a whole, the first electrode terminal 4 and the top cover plate 1 and the second electrode terminal 5 and the top cover plate 1 are separated and insulated, and an integrated sealing structure is formed.

In the present embodiment, as shown in fig. 1 to 3 and 14, two insulating holder through holes 60 corresponding to the terminal lead-out holes 13 one to one are formed in the lower insulating holder 6, and a plurality of insulating holder shaped grooves 61 are formed in the periphery of the insulating holder through holes 60; a plurality of fixing piece special-shaped convex blocks (73,83) clamped in the insulating support special-shaped groove 61 are respectively formed on the outer sides of the lower parts of the first fixing piece 7 and the second fixing piece 8; the first glue body 71 is correspondingly connected with a plurality of fixing part profile-shaped lugs 73 on the first fixing part 7, and the second glue body 81 is correspondingly connected with a plurality of fixing part profile-shaped lugs 83 on the second fixing part 8. When the first fixing member 7 is injection molded, the first colloid 71 and the fixing member special-shaped protrusion 73 are integrally molded, and the fixing member special-shaped protrusion 73 is molded in the insulating support special-shaped groove 61, so that the lower insulating support 6 is connected to the bottom surface of the top cover plate 1 through the first fixing member 7 by the matching connection of the fixing member special-shaped protrusion 73 and the insulating support special-shaped groove 61. Similarly, when the second fixing member 8 is injection molded, the second colloid 81 and the fixing member special-shaped protrusion 83 are integrally molded, and the fixing member special-shaped protrusion 83 is molded in the insulating support special-shaped groove 61, so that the lower insulating support 6 is connected to the bottom surface of the top cover plate 1 through the second fixing member 8 by the matching connection of the fixing member special-shaped protrusion 83 and the insulating support special-shaped groove 61.

In the present embodiment, as shown in fig. 1 to 3, an explosion-proof valve mounting hole 15 is formed on the top cover plate 1, an annular mounting groove 16 located at the periphery of the explosion-proof valve mounting hole 15 is formed on the lower end surface of the top cover plate 1, an explosion-proof valve 9 is disposed in the annular mounting groove 16, and a protective film 91 is disposed on the explosion-proof valve mounting hole 15; an explosion-proof valve protection cover 92 corresponding to the explosion-proof valve 9 is provided on the lower insulating support 6. And the upper surface of the mounting hole of the explosion-proof valve of the top cover plate is also provided with a double-exhaust semicircular groove 93. When the pressure in the battery reaches the explosion-proof valve 9 explosion-starting pressure value, the explosion-proof valve can be directly communicated with the outside through the explosion-proof valve protective cover 92 and the double exhaust semicircular groove 93 and the explosion-proof valve 9, the air is quickly released, and the explosion caused by high pressure in the battery box is prevented.

The embodiment of the invention also provides an injection molding assembly method of the lithium battery top cover assembly, which comprises the following steps:

(1) punching a plurality of straight holes of the top cover plate on the top cover plate 1, and performing plane punching on the top cover plate 1 again to ensure that the surface orifices of the straight holes of the top cover plate are contracted due to secondary punching to form inverted cone-shaped undercut grooves 12 of the top cover plate;

(2) a plurality of gear teeth (41,51) are respectively punched and formed on the peripheries of the first electrode terminal 4 and the second electrode terminal 5; then, carrying out lathe process to carry out the step thickness lathing and trimming processing of the terminal board;

(3) welding the explosion-proof valve 9 on the bottom surface of the explosion-proof valve mounting hole 15 of the top cover plate;

(4) assembling a first electrode terminal 4 to the upper surface of the top cap plate 1; meanwhile, the second electrode terminal 5 is mounted to the upper surface of the top cap plate 1;

(5) taking the lower insulating support 8 and placing the lower insulating support 8 into a mold, placing the assembled rear top cover assembly on the lower insulating support 8 in the mold, then performing an injection molding process, forming a first fixing piece 7 on the top cover plate 1 and corresponding to the position of the first electrode terminal 4, sequentially penetrating a first colloid 71 formed on the first fixing piece 7 through the abdicating side groove 42 and the first glue passing gap 43 of the first electrode terminal 4 from top to bottom and connecting the first colloid with the lower insulating support 6 into a whole, and simultaneously embedding a plurality of first meshing colloids 72 formed on the first fixing piece 4 into the undercut grooves 12 of the top cover plate; forming a second fixing piece 8 on the top cover plate 1 and corresponding to the position of the second electrode terminal 5, sequentially penetrating a yielding side groove 52 and a second glue passing gap of the second electrode terminal 5 from top to bottom through a second glue 81 formed on the second fixing piece 8 and connecting the yielding side groove and the second glue passing gap with the lower insulating bracket 6 into a whole, simultaneously embedding a plurality of second meshing glues 82 formed on the second fixing piece 8 into the top cover plate meshing groove 12, and simultaneously, injection-molding the explosion-proof valve 9 and the top cover plate 1 into a whole to form an integrated sealing structure;

wherein, the steps (1) and (2) are not in sequence, and the steps (3), (4) and (5) are not in sequence.

In the embodiment, the first fixing member 7 and the second fixing member 8 are formed by assembling the components together and performing injection molding at one time, so that the first electrode terminal 4 and the second electrode terminal 5 are respectively and tightly fixed on the top cover plate 1 by the first fixing member and the second fixing member to form an integrated sealing structure. Therefore, the assembly process is greatly simplified, the assembly efficiency is improved, and the production cost is reduced; and the leakproofness of first electrode terminal 4 after 5 assembly on lamina tecti 1 with second electrode terminal has been improved, has increased the combination stability between the structure, and the fixed dynamics of increase promotes and produces the property ability, improves product use reliability.

Example two

In the first embodiment, the structure of the roof module is explained. In this embodiment, differences from other embodiments are mainly described, and the same structure is not described repeatedly in this embodiment.

As shown in fig. 15, the main difference between the fifth embodiment and the other four embodiments is that the present embodiment is a secondary battery 10, which includes a case 101, an electrode assembly 102 disposed in the case 101, and a lithium battery top cover assembly 103 disposed on the case 101 and electrically connected to the electrode assembly 102, as claimed in any one of claims 1 to 9. By arranging the lithium battery top cover assembly 103 comprising any one of claims 1 to 7, which is electrically connected to the electrode assembly 102, on the casing 101, the electrode assembly 102 is sealed in the casing 101, so that the sealing performance of the battery is improved, the combination stability between structures is increased, the fixing strength is increased, the performance of the battery is improved, and the use reliability of the battery is improved; moreover, the assembly structure is simplified, so that the assembly process is simplified, the assembly efficiency is improved, and the production cost is reduced.

As to the specific connection manner between the housing 101 and the lithium battery top cover assembly 103, as shown in fig. 15, an opening 1011 is formed on the housing 101, and the lithium battery top cover assembly 103 covers the opening 1011. Cover in through lithium cell top cap subassembly 103 on the opening 1011, make this battery realize whole sealed, and then improve the leakproofness and the combination stability of this battery.

Preferably, the opening 1011 has a cylindrical structure.

As for the specific structure of the casing 101, the shape material and the like thereof are flexibly selected according to the design requirements of the secondary lithium battery, the shape thereof may be a hexahedron shape or other shapes, and the material may be aluminum, aluminum alloy, plastic and the like.

It should be noted that the shapes of all the components mentioned in the present embodiment are not limited to the shapes shown in the drawings, and the shapes of the components may be changed according to specific needs.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that other structures obtained by using the same or similar technical features as the above-described embodiments of the present invention are within the protection scope of the present invention.