The embossing structure of the explosion-proof valve for the top cover of a secondary lithium battery

Abstract

The present invention discloses an anti-explosion valve texturing structure for the top cover of a secondary lithium battery, which includes a top cover plate and an insulating bracket. An anti-explosion valve ventilation hole is provided in the middle of the top cover plate, and an anti-explosion valve support step is arranged at the bottom outer edge of the anti-explosion valve ventilation hole. A sunken groove is arranged inside the anti-explosion valve support step, and evenly distributed texturing grooves are arranged on the surface of the sunken groove. Evenly distributed first injection holes are arranged between the texturing grooves. An anti-explosion valve is installed inside the anti-explosion valve ventilation hole, and evenly distributed second injection holes are arranged along the circumference of the anti-explosion valve. The insulating bracket is connected to the bottom of the top cover plate through positioning posts. In the present invention, texturing grooves are arranged on the sunken groove of the anti-explosion valve ventilation hole. The contact area of the casting surface is increased through the evenly distributed texturing grooves, and at the same time, the sealing performance of the casting molding is improved, the sealing effect of the cover plate assembly is improved, and thus the performance of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of the top cover of secondary lithium batteries, and particularly to an anti-explosion valve texturing structure of the top cover of secondary lithium batteries. Background Art

[0002] In the top cover plate assembly of secondary lithium batteries, the anti-explosion valve plays a prominent safety protection role. The anti-explosion valve forms a positioning part through injection molding, and an anti-explosion valve protective cover is installed at the bottom of the anti-explosion valve to protect the anti-explosion valve. During the injection molding of the fixing part on the anti-explosion valve, the flat structure of the traditional injection molding surface results in poor injection molding sealing effect and poor connection stability. To solve these problems, we propose an anti-explosion valve texturing structure for the top cover of secondary lithium batteries. Summary of the Invention

[0003] The anti-explosion valve texturing structure of the top cover of secondary lithium batteries proposed by the present invention solves the problems that the flat structure of the injection molding surface of the anti-explosion valve in the existing cover plate assembly results in poor injection molding sealing effect and poor connection stability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The anti-explosion valve texturing structure of the top cover of secondary lithium batteries includes a top cover plate and an insulating bracket. An anti-explosion valve ventilation hole is provided in the middle of the top cover plate, and an anti-explosion valve support step is provided at the outer edge of the bottom of the anti-explosion valve ventilation hole. A sunken groove is provided inside the anti-explosion valve support step, and evenly distributed texturing grooves are provided on the surface of the sunken groove. Evenly distributed first injection molding through holes are provided between the texturing grooves. An anti-explosion valve is installed inside the anti-explosion valve ventilation hole. Second injection molding through holes are evenly provided along the circumference on the anti-explosion valve. An anti-explosion valve through hole is provided in the middle of the insulating bracket, and an anti-explosion valve protective cover is installed at the bottom of the anti-explosion valve through hole.

[0006] Preferably, a convex platform is provided at the top of the anti-explosion valve ventilation hole, and a protective film is attached to the surface of the convex platform. A liquid injection hole is provided on the top cover plate on one side of the anti-explosion valve ventilation hole. The inner edge of the convex platform is flush with the height of the anti-explosion valve support step.

[0007] Preferably, first electrode terminal through holes and second electrode terminal through holes for installing electrode terminals are respectively provided at both ends of the top cover plate, and electrode terminal through holes matching those on the insulating bracket are provided at the bottoms corresponding to the first electrode terminal through holes and the second electrode terminal through holes. The insulating bracket is connected to the bottom of the top cover plate through positioning posts.

[0008] Preferably, a notch is provided inside the anti-explosion valve, and the volume of the anti-explosion valve is smaller than the size of the anti-explosion valve through hole. A special-shaped groove is provided at the outer edge of the anti-explosion valve through hole.

[0009] Preferably, brackets are provided at the bottoms of the insulating brackets on both sides of the explosion-proof valve through-hole, and the brackets are symmetrically distributed. A pipe-positioning groove is formed in the inner wall of the bracket, and at both ends of the bottom of the pipe-positioning groove, snap-in recesses are formed, and the snap-in recesses penetrate through the insulating bracket.

[0010] Preferably, elastic snap fasteners are provided on both sides of the explosion-proof valve protective cover, and the elastic snap fasteners are matched with the snap-in recesses.

[0011] Preferably, the embossed groove is a blind hole structure with an inverted conical shape, the second injection through-hole is a through-hole, and the shape of the embossed groove is not limited to circular, square, oval, triangular, or irregular shapes.

[0012] Preferably, the specific steps of the processing and assembly method of the embossed groove are as follows:

[0013] S1: Stamp uniformly distributed straight holes on the inner side of the explosion-proof valve ventilation hole of the top cover plate that needs to be provided with an embossed groove, and at the same time, stamp out the first injection through-holes at intervals between the embossed grooves;

[0014] S2: Perform planar stamping on the top cover plate after forming the straight holes, so that the surface orifice of the straight hole shrinks due to re-stamping, forming an inverted conical blind hole;

[0015] S3: Assemble the top cover plate and the insulating bracket into one body, then place the explosion-proof valve into the accommodating cavity of the explosion-proof valve ventilation hole in the top cover plate for injection molding, and synchronously injection mold to form a fixing part, and stick a protective film on the convex platform;

[0016] S4: After injection molding, fix the explosion-proof valve protective cover through the elastic snap fasteners along the pipe-positioning groove in the bracket and snap it into the snap-in recess.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] An embossed groove is provided on the sunken groove of the explosion-proof valve ventilation hole. This embossed groove is set as a blind round hole with a bottom diameter larger than the head diameter, which is beneficial to increasing the tensile force between the fixing part and the electrode terminal after the colloid wraps the groove. The contact area of the casting surface is increased through the uniformly distributed embossed grooves, and at the same time, the sealing performance of the casting molding is improved, and the sealing effect of the cover plate assembly is improved, thereby improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front explosion structure schematic diagram of the present invention.

[0020] Figure 2 It is a reverse explosion structure schematic diagram of the present invention.

[0021] Figure 3 For the present invention Figure 2 Partial enlarged schematic diagram of the explosion-proof valve ventilation hole in.

[0022] Figure 4 For the present invention Figure 2 Partial enlarged schematic view of the middle pipe position groove.

[0023] Figure 5 Schematic diagram of the integral fixed sealing structure of the fixing part, explosion-proof valve and top cover plate of the present invention after injection molding.

[0024] Figure 6 For the present invention Figure 5 Partial enlarged schematic view of the fixing part and the knurled groove of the present invention

[0025] Figure 7 Schematic diagram of the elastic buckle fixed assembly structure of the present invention.

[0026] Reference numerals in the figure: 1, top cover plate; 2, first electrode terminal through hole; 3, explosion-proof valve vent hole; 31, boss; 32, explosion-proof valve support step; 33, sunken groove; 34, knurled groove; 35, first injection through hole; 4, liquid injection hole; 5, second electrode terminal through hole; 6, explosion-proof valve; 61, notch; 62, second injection through hole; 7, insulating bracket; 71, positioning post; 8, explosion-proof valve through hole; 81, special-shaped groove; 9, bracket; 10, pipe position groove; 11, buckle recess; 12, explosion-proof valve protective cover; 13, elastic buckle; 14, fixing part; 15, protective film. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0028] Referring to Figures 1 - 7 , the present invention provides the following technical solutions:

[0029] The knurled structure of the explosion-proof valve of the secondary lithium battery top cover includes a top cover plate 1 and an insulating bracket 7. An explosion-proof valve vent hole 3 is provided in the middle of the top cover plate 1, and an explosion-proof valve support step 32 is provided at the bottom outer edge of the explosion-proof valve vent hole 3. The function of the explosion-proof valve support step 32 is to support the explosion-proof valve to prevent it from sticking to the sunken groove 33. The purpose of leaving a gap is to allow the plastic to effectively fill the knurled groove 34 when injecting the fixing part 14. A sunken groove 33 is provided inside the explosion-proof valve support step 32, and evenly distributed knurled grooves 34 are provided on the surface of the sunken groove 33. Evenly distributed first injection through holes 35 are provided between the knurled grooves 34. An explosion-proof valve 6 is installed inside the explosion-proof valve vent hole 3. Second injection through holes 62 are evenly provided along the circumference of the explosion-proof valve 6. An explosion-proof valve through hole 8 is provided in the middle of the insulating bracket 7, and an explosion-proof valve protective cover 12 is installed at the bottom of the explosion-proof valve through hole 8.

[0030] In a specific embodiment, a boss 31 is provided at the top of the vent hole 3 of the explosion-proof valve, and a protective film 15 is attached to the surface of the boss 31. A liquid injection hole 4 is provided on the top cover plate 1 on one side of the vent hole 3 of the explosion-proof valve. The inner edge of the boss 31 is flush with the height of the explosion-proof valve support step 32, and an interval space can be provided for injection molding after assembly.

[0031] First electrode terminal through holes 2 and second electrode terminal through holes 5 for installing electrode terminals are respectively formed at both ends of the top cover plate 1, and electrode terminal through holes matching the first electrode terminal through holes 2 and the second electrode terminal through holes 5 are provided at the bottom corresponding to the insulating bracket 7. The insulating bracket 7 is connected to the bottom of the top cover plate 1 through positioning posts 71.

[0032] A notch 61 is provided inside the explosion-proof valve 6, and the volume of the explosion-proof valve 6 is smaller than the size of the explosion-proof valve through hole 8. A special-shaped groove 81 is provided on the outer edge of the explosion-proof valve through hole 8. The purpose of the special-shaped groove 81 is to tightly bite the fixing member 14 and the explosion-proof valve through hole 8 during injection molding, so that the top cover plate 1 and the insulating bracket 7 are bitten together and fixed, and at the same time the explosion-proof valve is fixed.

[0033] Supports 9 are provided at the bottom of the insulating bracket 7 on both sides of the explosion-proof valve through hole 8, and the supports 9 are symmetrically distributed. A pipe position groove 10 is provided on the inner wall of the support 9, and snap concave buttons 11 are provided at both ends of the bottom of the pipe position groove 10, and the snap concave buttons 11 penetrate through the insulating bracket 7.

[0034] Elastic snap buttons 13 are provided on both sides of the explosion-proof valve protective cover 12, and the elastic snap buttons 13 are matched with the snap concave buttons 11.

[0035] The embossing groove 34 is a blind hole structure with an inverted cone shape. The second injection through hole 62 is a through hole, and the shape of the embossing groove 34 is not limited to circular, square, oval, triangular, or special-shaped.

[0036] The specific steps of the processing and assembly method of the embossing groove 34 are as follows:

[0037] S1: Uniformly distributed straight holes are punched on the top cover plate 1 where the embossing groove 34 needs to be opened inside the vent hole 3 of the explosion-proof valve, and at the same time, first injection through holes 35 are punched at intervals between the embossing grooves 34;

[0038] S2: The top cover plate 1 after forming the straight holes is subjected to plane stamping, so that the surface orifice of the straight hole shrinks due to re-stamping, forming an inverted cone-shaped blind hole;

[0039] S3: Assemble the top cover plate 1 and the insulating bracket 7 into one body, then place the explosion-proof valve 6 into the accommodating cavity of the explosion-proof valve vent hole in the top cover plate 1 for injection molding, and synchronously injection mold to form the fixing part 14, and stick the protective film 15 on the boss 31;

[0040] S4: After injection molding, snap the explosion-proof valve protective cover 12 into the snap concave buckle 11 along the pipe position groove 10 in the bracket 9 through the elastic buckle 13 for fixation.

[0041] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. The embossed structure of the explosion-proof valve of the secondary lithium battery top cover, including a top cover plate (1) and an insulating bracket (7), is characterized in that, An explosion-proof valve ventilation hole (3) is provided in the middle of the top cover plate (1). An explosion-proof valve support step (32) is provided at the outer edge of the bottom of the explosion-proof valve ventilation hole (3). A sunken groove (33) is provided inside the explosion-proof valve support step (32). A uniformly distributed knurling groove (34) is provided on the surface of the sunken groove (33). Uniformly distributed first injection holes (35) are provided between the knurling grooves (34). An explosion-proof valve (6) is installed inside the explosion-proof valve ventilation hole (3). Second injection holes (62) are uniformly provided along the circumference on the explosion-proof valve (6). An explosion-proof valve through hole (8) is provided in the middle of the insulating bracket (7). An explosion-proof valve protective cover (12) is installed at the bottom of the explosion-proof valve through hole (8). A convex platform (31) is provided at the top of the explosion-proof valve ventilation hole (3). A protective film (15) is attached to the surface of the convex platform (31). A liquid injection hole (4) is provided on the top cover plate (1) on one side of the explosion-proof valve ventilation hole (3). The inner side edge of the convex platform (31) is flush with the height of the explosion-proof valve support step (32). A notch (61) is provided inside the explosion-proof valve (6). The volume of the explosion-proof valve (6) is smaller than the size of the explosion-proof valve through hole (8). A special-shaped groove (81) is provided at the outer edge of the explosion-proof valve through hole (8). Brackets (9) are provided at the bottom of the insulating bracket (7) on both sides of the explosion-proof valve through hole (8). The brackets (9) are symmetrically distributed. A pipe position groove (10) is provided on the inner wall of the bracket (9). Snap-in recesses (11) are provided at both ends of the bottom of the pipe position groove (10). The knurling groove (34) is a blind hole structure with an inverted conical shape. The second injection hole (62) is a through hole.

2. The explosion-proof valve texturing structure of the top cover of the secondary lithium battery according to claim 1, wherein First electrode terminal through holes (2) and second electrode terminal through holes (5) for installing electrode terminals are respectively provided at both ends of the top cover plate (1). Electrode terminal through holes that match are provided at the bottom of the first electrode terminal through hole (2) and the second electrode terminal through hole (5) corresponding to the insulating bracket (7). The insulating bracket (7) is connected to the bottom of the top cover plate (1) through positioning posts (71).

3. The explosion-proof valve texturing structure of the top cover of the secondary lithium battery according to claim 1, wherein Elastic snaps (13) are provided on both sides of the explosion-proof valve protective cover (12). The elastic snaps (13) are matched with the snap-in recesses (11).

4. The explosion-proof valve texturing structure of the top cover of the secondary lithium battery according to claim 1, characterized in that, The shape of the knurling groove (34) is not limited to circular, square, oval, triangular, or special-shaped.

5. The explosion-proof valve texturing structure of the top cover of the secondary lithium battery according to claim 1, characterized in that, The specific steps of the processing and assembly method of the knurling groove (34) are as follows: S1: Straight holes evenly distributed are punched inside the explosion-proof valve ventilation hole (3) of the top cover plate (1) that needs to be provided with the knurling groove (34). At the same time, the first injection holes (35) are punched at intervals between the knurling grooves (34). S2: The top cover plate (1) after forming the straight holes is subjected to plane stamping, so that the surface orifice of the straight hole shrinks due to re-stamping, forming an inverted conical blind hole. S3: Assemble the top cover plate (1) and the insulating bracket (7) into one body, then place the explosion-proof valve (6) into the accommodating cavity of the explosion-proof valve ventilation hole in the top cover plate (1) for injection molding, and synchronously injection mold to form the fixing part (14), and stick the protective film (15) on the boss (31); S4: After injection molding, snap the explosion-proof valve protective cover (12) into the snap concave buckle (11) along the pipe position groove (10) in the bracket (9) through the elastic snap (13) for fixation.

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