A nano-injection molded battery cover plate

Abstract

The utility model discloses a kind of nanometer injection-molded battery cover plate, comprising: substrate and support frame installed in the lower side of substrate, positive pole and negative pole are equipped on the substrate, the pole of positive pole and negative pole is installed in the mounting hole inside substrate, nanometer injection-molded part is equipped between the substrate and pole, interlocking piece corresponding to each other is equipped between the pole and substrate, and interlocking piece is located inside nanometer injection-molded part, double fixing is formed between the substrate and pole by interlocking piece and nanometer injection-molded part.The battery cover plate is introduced interlocking piece corresponding to each other between the substrate and pole, and makes interlocking piece located inside nanometer injection-molded part, realizes the "double fixing" between substrate and pole, and double fixing structure can effectively improve the tensile and torsional resistance of pole.Under the action of external stress, interlocking piece can share part of stress, thereby prolonging the service life of battery cover plate, improve the overall safety of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery component technology, and more specifically, to a battery cover plate applied to batteries using nano-injection molding. Background Technology

[0002] With the rapid development of electric vehicles and portable electronic devices, batteries, as their core components, face higher demands for safety, reliability, and energy density. As a key structural component of battery modules, the battery cover not only provides mechanical support and protection but, more importantly, enables electrical connection between the battery cells and the external environment, and ensures the sealing of the battery's internal environment.

[0003] Nano-injection molding, as an advanced metal-plastic bonding technology, theoretically can achieve strong anchoring of plastics by forming nanoscale micropores on the metal surface, providing a new approach to solving the aforementioned problems. However, directly applying conventional nano-injection molding technology to battery covers still faces many challenges. For example, nano-injection molding only provides microscopic "anchoring points" for the terminals, and its tensile and torsional resistance is somewhat lacking. The terminals and substrates of battery covers often contain many sharp corner structures. During the nano-injection molding process, when the molten plastic flows through these sharp corner areas, severe stress concentration can easily occur, leading to increased local stress in the molded part. At the same time, the sharp corner structures may also hinder the flow of the molten plastic, causing uneven or insufficient filling. Utility Model Content

[0004] The purpose of this invention is to solve the sealing defects of existing nano-injection molded cover plates. Nano-injection only provides microscopic "anchor points" for the pole, and has certain deficiencies in tensile strength and torsion resistance. Moreover, most of the current poles and substrates and other metal parts have sharp corners, which can easily cause stress concentration and poor plastic flow during the nano-injection process, and can easily lead to uneven filling and insufficient filling.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A nano-injection molded battery cover includes: a substrate and a support frame mounted on the lower side of the substrate, wherein a positive electrode and a negative electrode are provided on the substrate, and the electrode posts of the positive electrode and the negative electrode are installed inside the mounting holes of the substrate, and a nano-injection molded part is provided between the substrate and the electrode posts.

[0007] The electrode post and the substrate are provided with corresponding interlocking components, and the interlocking components are located inside the nano-injection molded part. The substrate and the electrode post are double-fixed by the interlocking components and the nano-injection molded part.

[0008] Furthermore, the interlocking component includes an annular boss connected to the pole post and an annular protrusion connected to the substrate, with the protrusion corresponding to the boss.

[0009] Furthermore, the outer ends of both sides of the vertical cross-section of the boss are semi-circular, and the boss is uniformly provided with through holes that extend upwards, with rounded corners at both the upper and lower ends of the through holes.

[0010] Furthermore, the vertical cross-section of the convex ring is "7" shaped, the convex ring includes a horizontal segment and a vertical segment, the horizontal segment and the vertical segment are integrated into one piece, the inner end of the horizontal segment is semi-circular, the back of the horizontal segment connecting the vertical segment is provided with rounded corners, and the vertical segment is arc-shaped.

[0011] Furthermore, the height of the boss is 0.5mm-0.7mm, the height of the horizontal section of the convex ring is 0.5mm-0.7mm, and the height of the pole post is 3.8mm-4.1mm.

[0012] Furthermore, the interlocking component includes an "L"-shaped boss connected to the pole post and an "L"-shaped protrusion connected to the substrate, with the "L"-shaped boss and the "L"-shaped protrusion corresponding to each other.

[0013] Furthermore, the upper ends of the cross-sections of the "L"-shaped boss and the "L"-shaped ring are both semi-circular, and the lower ends of the "L"-shaped boss and the "L"-shaped ring are rounded.

[0014] Beneficial effects: Compared with the prior art, this application has the following advantages:

[0015] 1. This battery cover incorporates corresponding interlocking components between the substrate and the terminal post, with these interlocking components located within the nano-injection molded part, achieving a "double fixation" between the substrate and the terminal post. This mechanical interlocking structure establishes physical limits and pull-out resistance simultaneously with the formation of the nano-injection molded part, significantly improving the mechanical strength and stability at the connection between the terminal post and the substrate. The double fixation structure effectively enhances the terminal post's resistance to pull-out and torsion. Under external stress, the interlocking components can share some of the stress, preventing premature failure of the nano-injection molded layer due to stress concentration, thereby extending the battery cover's service life and improving the overall safety of the battery.

[0016] 2. This battery cover, through optimized interlocking structure, improves the flowability of molten plastic during nano-injection molding. This helps avoid stress concentration and uneven filling at sharp corners, thereby improving the filling quality and uniformity of the nano-injection molded parts. It further enhances the bonding strength and sealing between the nano-injection molded parts and metal components, optimizes the plastic filling channel to the maximum extent, further improves the processability of nano-injection molding, reduces scrap rate, and lowers production costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the battery cover plate made by nano-injection molding according to this utility model;

[0018] Figure 2 This is a schematic cross-sectional view of the battery cover plate made by nano-injection molding according to this utility model;

[0019] Figure 3 This is a partially enlarged schematic diagram of the battery cover plate made by nano-injection molding according to this utility model;

[0020] Figure 4 This is a schematic diagram of the pole structure;

[0021] Figure 5 This is a schematic cross-sectional view of the cover plate according to another embodiment of the present invention;

[0022] Figure 6 This is a partially enlarged schematic diagram of the cover plate according to another embodiment of the present invention.

[0023] Reference numerals: 1-substrate, 101-mounting hole, 11-annular protrusion, 111-horizontal segment, 112-vertical segment, 12-"L"-shaped protrusion, 2-support frame, 3-pole post, 31-annular boss, 311-through hole, 32-"L"-shaped boss, 4-nano-injection molded part, 5-interlocking part. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1 and Figure 2 As shown, this invention provides a nano-injection molded battery cover, including a substrate 1 and a support frame 2 mounted on the lower side of the substrate 1. The substrate 1 has a positive electrode and a negative electrode, and the electrode posts 3 of the positive and negative electrodes are mounted inside mounting holes 101 in the substrate 1. A nano-injection molded part 4 is provided between the substrate 1 and the electrode posts 3. The nano-injection molded part 4 forms a dense bonding layer by injecting molten plastic under high temperature and pressure into the metal surfaces of the substrate 1 and the electrode posts 3, which have undergone special surface treatment (such as nano-microporousization), thereby achieving sealing and basic fixation between the electrode posts 3 and the substrate 1.

[0027] To further enhance the connection strength and reliability between the pole post 3 and the substrate 1, with a particular focus on improving tensile and torsional resistance, this invention incorporates interlocking components 5 between the substrate 1 and the pole post 3. The key feature of this interlocking component 5 is its location within the nano-injection molded part 4. This means that during the nano-injection molding process, the nano-injection molded part 4 not only encloses the gap between the pole post 3 and the substrate 1 but also completely fills the internal space formed by the interlocking component 5. Through this design, a "double-fixed" structure is formed between the substrate 1 and the pole post 3 through the combined action of the interlocking component 5 and the nano-injection molded part 4.

[0028] Specifically, the interlocking component 5 mechanically limits the electrode post 3 and the substrate 1 through its physical shape, providing a robust anti-detachment structure. Simultaneously, the nano-injection molded component 4 encasing it provides a precise seal and additional bonding strength. When external pulling or torsional forces are applied to the electrode post 3, the interlocking component 5 effectively prevents the electrode post 3 from detaching from or rotating from the substrate 1, thereby significantly improving the mechanical stability of the connection. The nano-injection molded component 4, while providing sealing performance, further enhances the bonding force between the interlocking component 5 and the metal components, making the entire connection structure more stable and reliable under mechanical stress. This dual fixing mechanism effectively solves the problem in existing technologies where nano-injection molding only provides microscopic "anchor points" for the electrode post, resulting in insufficient pull-out and torsional resistance.

[0029] like Figure 2 , Figure 3 and Figure 4 As shown, the interlocking component 5 specifically includes an annular boss 31 connected to the pole post 3 and an annular protrusion 11 connected to the substrate 1, and the annular protrusion 11 corresponds to the annular boss 31.

[0030] The annular boss 31 is an integrally formed annular protrusion on the outer surface of the pole post 3 along the circumference of the pole post. The annular ring 11 is an annular structure that protrudes inward / outward from the inner wall of the mounting hole 101 of the substrate 1 or from the edge of the mounting hole 101, corresponding to the annular boss 31. During assembly, the annular boss 31 and the annular ring 11 can cooperate to form a cavity with mechanical interlocking function for the injection of the nano-injection molded part 4. After the nano-injection molded part 4 is injected and cured, it will completely fill the space between the annular boss 31 and the annular ring 11, forming a tightly wrapped structure, further enhancing the mechanical interlocking effect. This annular structure design allows the interlocking components to be evenly distributed throughout the circumference of the pole post, providing uniform mechanical support and effectively resisting tensile and torsional stresses from all directions.

[0031] To further optimize the processability of nano-injection molding and reduce injection defects, such as Figure 3As shown, the outer ends of both sides of the vertical cross-section of the annular boss 31 are semi-circular. This semi-circular design eliminates sharp corners, allowing the molten plastic to fill the mold cavity more smoothly when flowing through the boss 31, avoiding problems such as stress concentration, obstructed filling, underfilling, or air bubbles that are prone to occur during injection molding with traditional right-angle or sharp-corner structures. The semi-circular transition surface can effectively guide the flow of plastic and improve the uniformity of filling, thereby ensuring the bonding quality between the nano-injection part 4 and the pole post 3.

[0032] Furthermore, to further enhance the bonding area and bonding strength between the nano-injection molded part 4 and the pole post 3, the annular boss 31 is uniformly provided with through holes 311 extending upwards. These through holes 311 are completely filled by the molten plastic during the nano-injection molding process, forming multiple "rivet" effects, allowing the nano-injection molded part 4 to penetrate the annular boss 31 and achieve mechanical anchoring with the pole post 3 over a larger volume area. This design not only increases the bonding area but also forms multi-point support, further improving tensile and shear resistance. To ensure smooth plastic filling and avoid stress concentration, the upper and lower ends of the through holes 311 are rounded. The rounded corner structure avoids sharp right angles, facilitates the flow and venting of the molten plastic, ensures full filling of the through holes 311, and reduces the risk of stress concentration in these areas of the nano-injection molded part after curing.

[0033] like Figure 4 As shown, to better fit with the semi-circular annular boss 31 and further optimize the injection molding flow channel, the vertical cross-section of the annular boss 11 is "7" shaped. This "7" shaped boss 11 includes a horizontal segment 111 and a vertical segment 112, which are integrated into a single design. The inner end of the horizontal segment 111 is semi-circular, forming a smooth fit with the semi-circular outer end of the annular boss 31, guiding the plastic to fill smoothly. The back of the connection between the horizontal segment 111 and the vertical segment 112 has rounded corners, also to optimize plastic flow and avoid injection molding defects. Furthermore, the vertical segment 112 is designed as an arc. The arc-shaped vertical segment 112 not only has good structural strength, but its smooth curved surface also helps to uniformly fill the molten plastic, reducing potential underfilling or stress concentration at dead corners or sharp angles. This "7" shaped cross-section, combined with the semi-circular and rounded corner design, along with the structure of the annular boss 11, provides an ideal molding space for the nano-injection part 4, making the nano-injection molding more compact and reliable.

[0034] In terms of specific dimensions, to ensure the effectiveness of the interlocking component 5 and meet strength requirements, the height of the annular boss 31 is preferably 0.5mm-0.7mm, and the height of the transverse segment of the annular protrusion 11 is also preferably 0.5mm-0.7mm. This dimensional design ensures that the interlocking component 5, after being completely encased by the nano-injection molded part 4, can form a sufficiently large mechanical limiting effect, while not excessively increasing the overall size of the electrode post 3 or the substrate 1. The height of the electrode post 3 is preferably 3.8mm-4.1mm. This height range ensures that the electrode post 3 has sufficient length to connect with the battery cell and provides sufficient space for the interlocking structure. Precise control of these dimensional parameters is an important guarantee for achieving both high strength and high reliability in fixing.

[0035] Example 2

[0036] Based on Embodiment 1, as another preferred embodiment of the present invention, such as Figure 5 As shown, the interlocking member 5 includes an "L"-shaped boss 32 connected to the pole post 3 and an "L"-shaped protrusion ring 12 connected to the base plate 1, and the "L"-shaped boss 32 and the "L"-shaped protrusion ring 12 correspond to each other.

[0037] This "L"-shaped structure design also provides a strong mechanical interlocking effect. Through the "L"-shaped inward interlocking structure, the "L"-shaped protrusion 32 of the pole post 3 can be interlocked with the "L"-shaped protrusion 12 of the substrate 1, forming a physical limit and effectively resisting the axial pull-out force of the pole post 3. When the nano-injection molded part 4 fills the internal space of this "L"-shaped structure, a more complex and stronger double fixation is formed.

[0038] To further optimize the processability of nano-injection molding, such as Figure 5 As shown, the upper ends of the cross-sections of the "L"-shaped boss 32 and the "L"-shaped ring 12 are both semi-circular. This semi-circular design is the same as the principle in Embodiment 2, which can effectively eliminate sharp corners, improve the flow properties of molten plastic, reduce filling defects and stress concentration during injection molding, thereby improving the formation quality and bonding strength of the nano-injection molded part 4. In addition, the lower ends of the "L"-shaped boss 32 and the "L"-shaped ring 12 are provided with rounded corners. These rounded corner designs are also to promote the smooth flow of plastic and avoid the formation of dead corners or stress concentration points in the bottom area. The "L"-shaped boss 32 is uniformly provided with through holes 311 to ensure that the nano-injection molded part 4 can uniformly and densely fill the entire interlocking structure. This optimized "L"-shaped interlocking structure provides strong mechanical fixation while also taking into account the convenience of manufacturing process and yield.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nano-injection molded battery cover, comprising: A substrate (1) and a support frame (2) mounted on the lower side of the substrate (1), wherein a positive electrode and a negative electrode are provided on the substrate (1), and the pole posts (3) of the positive electrode and the negative electrode are installed inside the mounting holes (101) of the substrate (1), wherein a nano-injection molded part (4) is provided between the substrate (1) and the pole post (3). The pole post (3) and the substrate (1) are provided with corresponding interlocking parts (5), and the interlocking parts (5) are located inside the nano-injection molded part (4). The substrate (1) and the pole post (3) are double fixed by the interlocking parts (5) and the nano-injection molded part (4).

2. The nano-injection molded battery cover plate according to claim 1, characterized in that: The interlocking member (5) includes an annular boss (31) connected to the pole post (3) and an annular protrusion (11) connected to the substrate (1), and the protrusion (11) corresponds to the boss (31).

3. The nano-injection molded battery cover plate according to claim 2, characterized in that: The two outer ends of the vertical cross-section of the boss (31) are semi-circular. The boss (31) is uniformly provided with through holes (311) that pass through it. The upper and lower ends of the through holes (311) are rounded.

4. The nano-injection molded battery cover plate according to claim 2, characterized in that: The vertical cross-section of the convex ring (11) is "7" shaped. The convex ring (11) includes a horizontal segment (111) and a vertical segment (112). The horizontal segment (111) and the vertical segment (112) are integrated. The inner end of the horizontal segment (111) is semi-circular. The back of the horizontal segment (111) and the vertical segment (112) are connected by rounded corners. The vertical segment (112) is arc-shaped.

5. The nano-injection molded battery cover according to claim 2, characterized in that: The height of the boss (31) is 0.5mm-0.7mm, the height of the horizontal section of the convex ring (11) is 0.5mm-0.7mm, and the height of the pole post (3) is 3.8mm-4.1mm.

6. The nano-injection molded battery cover according to claim 1, characterized in that: The interlocking member (5) includes an "L"-shaped boss (32) connected to the pole post (3) and an "L"-shaped protrusion (12) connected to the substrate (1), and the "L"-shaped boss (32) corresponds to the "L"-shaped protrusion (12).

7. The nano-injection molded battery cover plate according to claim 6, characterized in that: The upper ends of the cross-sections of the "L"-shaped boss (32) and the "L"-shaped ring (12) are semi-circular, and the lower ends of the "L"-shaped boss (32) and the "L"-shaped ring (12) are rounded.

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