A battery top cover structure

Abstract

This application relates to a battery top cover structure suitable for a battery casing, including a top cover, a first terminal assembly, a second terminal assembly, and a lower plastic layer. The top cover abuts against the lower plastic layer. One end of the top cover has a first terminal hole, and the other end has a second terminal hole. The first terminal hole has a first circumferential opening on its side away from the lower plastic layer, and the second terminal hole has a second circumferential opening on its side away from the lower plastic layer. The first terminal assembly is disposed within the first terminal hole and abuts against the first circumferential opening. The second terminal assembly is disposed within the second terminal hole and abuts against the second circumferential opening. This application has a simple structure, reliable performance, greatly reduces production costs, and has higher practicality and economy, making it suitable for production and use as a general-purpose product.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery top cover structure. Background Technology

[0002] With the development of technology, power batteries have received increasing attention as an energy device and have been widely used in mobile phones, electric vehicles, power tools and other fields.

[0003] In conventional square lithium-ion or sodium-ion battery structures, the terminal structure of the top cover takes various forms. Some are integral structures, while others are made into separate components and then welded to the top cover to form a complete top cover structure. In a commonly used top cover structure, the copper and aluminum parts of the negative electrode terminal are friction-welded, and then the negative electrode terminal is machined. The positive electrode terminal is cold-forged and machined. During the assembly stage, injection-molded PPS plastic is used to prevent the terminal from falling off, resulting in good performance. However, this type of top cover has a complex manufacturing process and high production costs, making it difficult to achieve widespread application. Utility Model Content

[0004] Based on this, the present invention provides a battery top cover structure, which aims to solve the problems of the existing top cover terminal structure being complex, having high manufacturing costs, and being difficult to widely apply.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a battery top cover structure, suitable for a battery casing, comprising a top cover, a first terminal post assembly, a second terminal post assembly, and a lower plastic; the top cover abuts against the lower plastic; one end of the top cover is provided with a first terminal post hole, and the other end is provided with a second terminal post hole; the first terminal post hole has a first circumferential opening on its side away from the lower plastic, and the second terminal post hole has a second circumferential opening on its side away from the lower plastic; the first terminal post assembly is disposed within the first terminal post hole, and the first terminal post assembly abuts against the first circumferential opening; the second terminal post assembly is disposed within the second terminal post hole, and the second terminal post assembly abuts against the second circumferential opening.

[0006] In a preferred embodiment, from the lower plastic to the top cover, the first constriction extends from the edge of the first pole hole away from the top cover, and the diameter of the first constriction gradually decreases to the minimum diameter; the plane containing the minimum diameter is parallel to the top cover.

[0007] In a preferred embodiment, from the lower plastic to the top cover, the second constriction extends from the edge of the second pole hole away from the top cover, and the diameter of the second constriction gradually decreases to the minimum diameter; the plane containing the minimum diameter is parallel to the top cover.

[0008] In a preferred embodiment, the first electrode assembly includes a first upper plastic, a first electrode, and a first sealing ring; the first sealing ring is sleeved on the first electrode and disposed at the edge of the first electrode hole, the first electrode passes through the first electrode hole and abuts against the first sealing ring; the first upper plastic is injection molded on the first electrode and abuts against the first sealing ring.

[0009] In a preferred embodiment, the end of the first pole post away from the top cover is provided with a first protrusion, which protrudes from the first upper plastic part.

[0010] In a preferred embodiment, the second pole assembly includes a second upper plastic, a second pole, and a second sealing ring; the second sealing ring is sleeved on the second pole and is disposed at the edge of the second pole hole, the second pole passes through the second pole hole and abuts against the second sealing ring; the second upper plastic is injection molded on the second pole and abuts against the second sealing ring.

[0011] In a preferred embodiment, the end of the second pole away from the top cover is provided with a second protrusion, which protrudes from the second upper plastic part.

[0012] In a preferred embodiment, the top cover has a plurality of buckle holes on the side near the lower plastic; the lower plastic has a plurality of protrusions on the side near the top cover; the protrusions are provided in a one-to-one correspondence with the buckle holes; and the protrusions are buckled into the buckle holes.

[0013] In a preferred embodiment, a plurality of the buckle holes are symmetrically arranged on both sides of the top cover side; among the buckle holes on the same side, the buckle holes at the same end are equally spaced.

[0014] In a preferred embodiment, a plurality of the protrusions are symmetrically arranged on both sides of the lower plastic side surface; among the protrusions on the same side, the protrusions at the same end are arranged at equal intervals.

[0015] In a preferred embodiment, the protrusion is adapted to the undercut hole; the protrusion is a circular protrusion; the undercut hole is a circular undercut hole.

[0016] In a preferred embodiment, the top cover is provided with an explosion-proof valve hole, which is located between the first pole hole and the second pole hole; an explosion-proof valve is provided inside the explosion-proof valve hole.

[0017] In a preferred embodiment, the lower plastic body is further provided with a groove, a first hole, and a second hole; the groove is disposed between the first hole and the second hole; the first hole is disposed below the first pole post hole, the second hole is disposed below the second pole post hole, and the groove is disposed below the explosion-proof valve hole; the first hole is adapted to the first pole post assembly, and the second hole is adapted to the second pole post assembly; the groove is provided with a plurality of hollow holes.

[0018] In a preferred embodiment, the first terminal assembly is a positive terminal assembly and the second terminal assembly is a negative terminal assembly; or, the first terminal assembly is a negative terminal assembly and the second terminal assembly is a positive terminal assembly.

[0019] In a preferred embodiment, the casing battery is a square casing battery; the square casing battery is a lithium-ion battery or a sodium-ion battery.

[0020] The beneficial effects achieved by this utility model are as follows: The structure of this application significantly improves the safety performance of the battery structure, effectively protecting the battery, extending its lifespan, and reducing usage costs. The structure of this application is simple and reliable. Compared to similar products on the market, the structure of this application greatly reduces production costs while ensuring product performance, exhibiting a significant cost advantage, higher practicality and economy, and can be produced and used as a general-purpose product. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the battery top cover structure according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 An exploded structural diagram of the battery top cover;

[0024] Figure 3 for Figure 1 A cross-sectional structural diagram of the battery top cover structure;

[0025] Figure 4 for Figure 2 A structural diagram of the top cover from another angle;

[0026] Figure 5 for Figure 2 A schematic diagram of the structure of the first pole.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, top, bottom, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] Specifically, such as Figures 1 to 3 As shown, this utility model embodiment provides a battery top cover structure suitable for a battery casing, including a top cover 10, a first terminal post assembly 20, a second terminal post assembly 30, and a lower plastic 40; the top cover 10 abuts against the lower plastic 40; one end of the top cover 10 is provided with a first terminal post hole 11, and the other end is provided with a second terminal post hole 12; the first terminal post hole 11 has a first constriction 111 circumferentially provided on the side away from the lower plastic 40, and the second terminal post hole 12 has a second constriction 121 circumferentially provided on the side away from the lower plastic 40; the first terminal post assembly 20 is disposed in the first terminal post hole 11, and the first terminal post assembly 20 abuts against the first constriction 111; the second terminal post assembly 30 is disposed in the second terminal post hole 12, and the second terminal post assembly 30 abuts against the second constriction 121.

[0034] In a preferred embodiment, from the lower plastic 40 to the top cover 10, the first constriction 111 extends from the edge of the first pole hole 11 away from the top cover 10, and the diameter of the first constriction 111 gradually decreases to a minimum diameter; the plane containing the minimum diameter is parallel to the top cover 10. This arrangement effectively prevents the first pole from falling off and facilitates its fixation.

[0035] In a preferred embodiment, from the lower plastic 40 to the top cover 10, the second constriction 121 extends from the edge of the second pole hole 12 away from the top cover 10, and the diameter of the second constriction 121 gradually decreases to a minimum diameter; the plane containing the minimum diameter is parallel to the top cover 10. This arrangement effectively prevents the second pole from falling off and facilitates its fixation.

[0036] In this embodiment, the first constriction 111 and the second constriction 121 are symmetrically arranged, which helps to ensure the consistency of battery performance.

[0037] In a preferred embodiment, the first electrode assembly 20 includes a first upper plastic 21, a first electrode 22, and a first sealing ring 23. The first sealing ring 23 is sleeved on the first electrode 22 and is disposed at the edge of the first electrode hole 11. The first electrode 22 passes through the first electrode hole 11 and abuts against the first sealing ring 23. The first upper plastic 21 is injection molded onto the first electrode 22 and abuts against the first closing opening 111. In this way, the cooperation between the first upper plastic and the first closing opening can prevent the first electrode from falling off, which is beneficial to the fixation of the first electrode.

[0038] As a preferred embodiment, such as Figure 5 As shown, the first electrode post 22 has a first protrusion 221 at the end away from the top cover 10, and the first protrusion 221 protrudes from the first upper plastic 21. This design can effectively simplify the welding process of the positive and negative electrode connecting pieces. At the same time, with the first protrusion 221 as the protruding position, the first electrode post 22 can be welded to the connecting piece by welding, which is convenient and quick.

[0039] In this embodiment, the first pole post 22 further includes a first cylindrical portion 222, a first ring 223, and a second cylindrical portion 224. The first protrusion 221 is disposed on the first cylindrical portion 222, and the first ring 223 is disposed around one end of the first cylindrical portion 222 near the second cylindrical portion 224. The first cylindrical portion 222 is disposed on the second cylindrical portion 224. The first sealing ring 23 is sleeved on the outside of the second cylindrical portion 224, and the first sealing ring 23 abuts against the first cylindrical portion 222, the first ring 223, and the second cylindrical portion 224 respectively. The first cylindrical portion 222 abuts against the first upper plastic 21.

[0040] Similarly, in this embodiment, the second electrode 32 has a structure similar to the first electrode. This structure eliminates the need for significant modifications to the battery structure, facilitating implementation and widespread adoption. The first electrode can be formed using integral stamping technology, which offers advantages such as good consistency, simple manufacturing process, and low cost, making it highly suitable for mass production.

[0041] In a preferred embodiment, the second electrode assembly 30 includes a second upper plastic 31, a second electrode 32, and a second sealing ring 33. The second sealing ring 33 is sleeved on the second electrode 32 and is located at the edge of the second electrode hole 12. The second electrode 32 passes through the second electrode hole 12 and abuts against the second sealing ring 33. The second upper plastic 31 is injection molded onto the second electrode 32 and abuts against the second closing opening 121. Thus, the cooperation between the second upper plastic 31 and the second closing opening 121 prevents the second electrode 32 from falling off, facilitating its fixation.

[0042] As a preferred embodiment, such as Figure 4 As shown, the second electrode post 32 has a second protrusion 321 at the end away from the top cover 10, and the second protrusion 321 protrudes from the second upper plastic 31. This design can effectively simplify the welding process of the positive and negative electrode connecting pieces. At the same time, with the second protrusion 321 as the protruding position, the second electrode post 32 can be welded to the connecting piece by welding, which is convenient and quick.

[0043] The second pole post 32 is made of copper-aluminum composite material and is processed by integral stamping technology. It has the advantages of good consistency, simple manufacturing process and low cost, and is very suitable for mass production.

[0044] In a preferred embodiment, the top cover 10 has a plurality of snap-fit ​​holes 13 on its side near the lower plastic 40; the lower plastic 40 has a plurality of protrusions 41 on its side near the top cover 10; the protrusions 41 are corresponding one-to-one with the snap-fit ​​holes 13; and the protrusions 41 are snapped into the snap-fit ​​holes 13. In this application, the lower plastic 40 is fixed to the bottom of the top cover by snap-fit, which is convenient and quick; in other embodiments, the lower plastic is also fixed to the bottom of the top cover by ultrasonic welding.

[0045] In a preferred embodiment, a plurality of the buckle holes 13 are symmetrically arranged on both sides of the side of the top cover 10; among the buckle holes 13 on the same side, the buckle holes 13 at the same end (with the explosion-proof valve hole as the boundary, the top cover is divided into left and right ends) are equally spaced. In this way, the top cover 10 is more firmly and stably fixed to the lower plastic 40.

[0046] In a preferred embodiment, a plurality of the protrusions 41 are symmetrically arranged on both sides of the lower plastic 40; among the protrusions 41 on the same side, those at the same end (with the groove as the boundary, the lower plastic is divided into left and right ends) are equally spaced. This makes the top cover 10 and the lower plastic 40 more firmly and stably fixed.

[0047] In a preferred embodiment, the protrusion 41 is adapted to the buckle hole 13; the protrusion 41 is a circular protrusion; the buckle hole 13 is a circular buckle hole. This makes the fixing of the top cover 10 and the lower plastic 40 more secure and stable, and simplifies the manufacturing process.

[0048] In a preferred embodiment, the top cover 10 is provided with an explosion-proof valve hole 14, which is located between the first pole hole 11 and the second pole hole 12; an explosion-proof valve 50 is disposed within the explosion-proof valve hole 14. In this application, the explosion-proof valve 50 is welded to the top cover by laser welding. The explosion-proof valve can be in various forms such as circular, elliptical, square, or polygonal; specifically, in this embodiment, the explosion-proof valve is elliptical.

[0049] In a preferred embodiment, the lower plastic 40 is further provided with a groove 42, a first hole 43, and a second hole 44; the groove 42 is disposed between the first hole 43 and the second hole 44; the first hole 43 is disposed below the first pole post hole 11, the second hole 44 is disposed below the second pole post hole 12, and the groove 42 is disposed below the explosion-proof valve hole 14; the first hole 43 is adapted to the first pole post assembly 20, and the second hole 44 is adapted to the second pole post assembly 30; a plurality of hollow holes 421 are provided in the groove 42. In this embodiment, the plurality of hollow holes 421 are arranged at equal intervals, which is beneficial to the function of the explosion-proof valve.

[0050] In a preferred embodiment, the first terminal assembly 20 is a positive terminal assembly, and the second terminal assembly 30 is a negative terminal assembly; or, the first terminal assembly 20 is a negative terminal assembly, and the second terminal assembly 30 is a positive terminal assembly. Specifically, in the embodiments of this application, the first terminal assembly 20 is a positive terminal assembly, and the second terminal assembly 30 is a negative terminal assembly.

[0051] In a preferred embodiment, the battery casing is a square-shaped battery casing; the square-shaped battery casing is a lithium-ion battery or a sodium-ion battery. Specifically, in the embodiments of this application, the square-shaped battery casing is a lithium-ion battery.

[0052] The structure described in this application significantly improves the safety performance of the battery structure, effectively protecting the battery, extending its lifespan, and reducing operating costs. The structure is simple and reliable. Compared to similar products on the market, this structure greatly reduces production costs while maintaining product performance, offering a clear cost advantage, higher practicality and economy, and can be produced and used as a general-purpose product.

[0053] In the embodiments of this application, the battery casing is generally a square battery. The cover can be an aluminum cover or a cover made of other materials.

[0054] In this application, the sealing ring can be prepared from one or more of the following materials: PP, PC, PVC, PPS, PE and PET, or a mixture of at least two of these materials.

[0055] The lower plastic can be processed by injection molding, which has high precision and is simple and reliable in structure.

[0056] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0058] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery top cover structure, characterized in that, The device is suitable for a battery casing and includes a top cover, a first terminal assembly, a second terminal assembly, and a lower plastic casing. The top cover abuts against the lower plastic casing. One end of the top cover has a first terminal hole, and the other end has a second terminal hole. The first terminal hole has a first circumferential opening on its side away from the lower plastic casing, and the second terminal hole has a second circumferential opening on its side away from the lower plastic casing. The first terminal assembly is disposed within the first terminal hole and abuts against the first circumferential opening. The second terminal assembly is disposed within the second terminal hole and abuts against the second circumferential opening.

2. The battery top cover structure according to claim 1, characterized in that, From the lower plastic to the top cover, the first constriction extends from the edge of the first pole hole away from the top cover, and the diameter of the first constriction gradually decreases to the minimum diameter; the plane containing the minimum diameter is parallel to the top cover.

3. The battery top cover structure according to claim 1, characterized in that, From the lower plastic to the top cover, the second constriction extends from the edge of the second pole hole away from the top cover, and the diameter of the second constriction gradually decreases to the minimum diameter; the plane containing the minimum diameter is parallel to the top cover.

4. The battery top cover structure according to claim 1, characterized in that, The first electrode assembly includes a first upper plastic, a first electrode, and a first sealing ring; the first sealing ring is sleeved on the first electrode and is disposed at the edge of the hole of the first electrode, the first electrode passes through the hole of the first electrode and abuts against the first sealing ring; the first upper plastic is injection molded on the first electrode and abuts against the first sealing ring.

5. The battery top cover structure according to claim 4, characterized in that, The first pole post has a first protrusion at the end away from the top cover, and the first protrusion protrudes from the first upper plastic part.

6. The battery top cover structure according to claim 1, characterized in that, The second electrode assembly includes a second upper plastic, a second electrode, and a second sealing ring; the second sealing ring is sleeved on the second electrode and is located at the edge of the hole in the second electrode, and the second electrode passes through the hole in the second electrode and abuts against the second sealing ring; the second upper plastic is injection molded onto the second electrode and abuts against the second sealing ring.

7. The battery top cover structure according to claim 6, characterized in that, The second pole post has a second protrusion at the end away from the top cover, and the second protrusion protrudes from the second upper plastic part.

8. The battery top cover structure according to claim 1, characterized in that, The top cover has several buckle holes on the side near the bottom plastic; the bottom plastic has several protrusions on the side near the top cover; the protrusions are arranged in a one-to-one correspondence with the buckle holes; the protrusions are buckled into the buckle holes.

9. The battery top cover structure according to claim 8, characterized in that, Several of the aforementioned buckle holes are symmetrically arranged on both sides of the top cover side; among the buckle holes on the same side, the buckle holes at the same end are equally spaced; Several protrusions are symmetrically arranged on both sides of the lower plastic side; among the protrusions on the same side, the protrusions at the same end are equally spaced.

10. The battery top cover structure according to claim 8, characterized in that, The protrusion is adapted to fit the undercut hole; the protrusion is a circular protrusion; the undercut hole is a circular undercut hole; The first terminal assembly is a positive terminal assembly, and the second terminal assembly is a negative terminal assembly; or, the first terminal assembly is a negative terminal assembly, and the second terminal assembly is a positive terminal assembly. The battery casing is a square-shaped battery casing; the square-shaped battery casing is a lithium-ion battery or a sodium-ion battery.

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