Assembly structure of plastic and cover plate on battery and battery

Abstract

The utility model discloses an assembling structure of upper plastic cement and a cover plate of a battery and the battery, which belong to the technical field of battery manufacturing and comprise a pole, lower plastic cement and a sealing ring which are sleeved on the pole, the cover plate and the upper plastic cement which are laminated on the lower plastic cement and are provided with a limiting groove, and a limiting piece which is arranged on the upper plastic cement and is matched with the limiting groove, the sealing ring is respectively connected with the pole and the lower plastic, and the cover plate and the upper plastic are respectively sleeved on the pole; the limiting piece is embedded into the limiting groove, and the limiting piece is gradually shrunk in the stacking direction. According to the utility model, the technical effects of improving the sealing performance and improving the safety are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and particularly relates to an assembly structure of a plastic part and a cover plate on a battery and a battery. Background Art

[0002] In the battery manufacturing industry, the safety of a single cell is a crucial link. Especially when the positive and negative electrode posts on the cover plate of a finished square aluminum shell battery are subjected to external pressure, their stability is directly related to the overall performance and safety of the battery. Currently, in the existing battery manufacturing technology, when the force on the post exceeds the deformation value of the upper plastic structure, the upper plastic structure will collapse. At this time, the sealing rubber ring will be displaced or deformed, resulting in the loss of sealing of the cover plate, and electrolyte leakage may occur. The internal contact electrodes of the battery will cause a short circuit, seriously affecting the safety performance of the product.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is the technical problem of poor sealing and safety.

[0005] To solve the above technical problems, the utility model provides an assembly structure of a plastic part and a cover plate on a battery. The assembly structure includes: a post, a lower plastic and a sealing ring sleeved on the post, a cover plate with a limiting groove laminated on the lower plastic, and an upper plastic. A limiting member matching the limiting groove is arranged on the upper plastic. The sealing ring is respectively connected with the post and the lower plastic. The cover plate and the upper plastic are respectively sleeved on the post. The limiting member is embedded in the limiting groove, and the limiting member is tapered along the lamination direction.

[0006] Optionally, the post includes a column body, a convex platform and a groove sequentially arranged on the column body along the lamination direction. The lower plastic is connected with the column body, and the projection of the convex platform on the lower plastic along the lamination direction is located within the lower plastic. The sealing ring is connected with the convex platform, and the projection of the sealing ring on the convex platform along the opposite direction of the lamination direction is located on the convex platform.

[0007] Optionally, the upper plastic includes a main body, a first convex portion and a second convex portion respectively connected with the main body. The main body is connected with the limiting member. The first convex portion is embedded in the groove. The second convex portion is connected with the sealing ring, and the second convex portion is located between the post and the cover plate.

[0008] Optionally, the second convex portion is perpendicular to the sealing ring.

[0009] Optionally, the groove is annular.

[0010] Optionally, the limiting member includes a connecting end and a limiting end connected to the connecting end, and the projection of the connecting end in the opposite direction of the stacking direction on the limiting end is located on the limiting end.

[0011] Optionally, the limiting groove is annular, the limiting groove includes a groove bottom and a groove wall connected to the groove bottom, the limiting end is connected to the groove bottom, and the connecting end is connected to the groove wall.

[0012] Optionally, the limiting member is in an inverted T shape.

[0013] Optionally, the limiting member is conical.

[0014] According to another aspect of the present invention, the present invention also provides a battery, and the battery includes the assembly structure of the upper plastic of the battery and the cover plate.

[0015] Beneficial effects:

[0016] The present invention provides an assembly structure of the upper plastic of a battery and a cover plate. By sleeving a lower plastic and a sealing ring on a pole column, the sealing ring is respectively connected to the pole column and the lower plastic. The cover plate of the limiting groove and the upper plastic are stacked on the lower plastic, and the cover plate and the upper plastic are respectively sleeved on the pole column. The limiting member is arranged on the upper plastic and is matched with the limiting groove, and the limiting member is embedded in the limiting groove. The limiting member is tapered along the stacking direction. In this way, through the cooperation of the limiting groove and the tapered limiting member, the stable locking of the cover plate, the pole column and the upper plastic is realized, the loosening or falling caused by vibration or impact is avoided, the relative movement between the cover plate and the upper plastic is effectively prevented, the compressive strength of the cover plate is improved at the same time, the sealing performance between the cover plate, the pole column and the upper plastic is enhanced, the risk of short circuit caused by external leakage of the electrolyte is reduced, and it is beneficial to improve the battery safety performance. Thus, the technical effects of improving the sealing performance and enhancing the safety are achieved. Description of the drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of an assembly structure of the upper plastic of a battery and a cover plate provided by an embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of a pole column in an assembly structure of the upper plastic of a battery and a cover plate provided by an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the upper plastic in an assembly structure of the upper plastic and the cover plate for a battery provided by an embodiment of the present utility model. Detailed implementation manners

[0021] The following details the implementation manners of the present application. The examples of the implementation manners are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The implementation manners described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as a limitation of the present application.

[0022] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0023] In the embodiments of the present application, "at least one" means one or more; "a plurality" means two or more. In the description of the present application, words such as "first", "second", "third", etc. are only used for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor as indicating or implying order.

[0024] The reference to "an implementation manner" or "some implementation manners" etc. in this specification means that a specific feature, structure, or characteristic described in conjunction with the embodiment is included in one or more implementation manners of the present application. Thus, the terms "include", "comprise", "have" and their variants in this specification all mean "including but not limited to", unless otherwise specifically emphasized in other ways. It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects and means that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0025] It should be noted that in the embodiments of the present utility model, when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. At the same time, in the embodiments of the present application, "connection" can also be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, when A is connected to B, it can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present utility model are only for illustrative purposes and are not intended to limit the present utility model.

[0026] An assembly structure of a plastic part 5 and a cover plate 4 on a battery provided in Embodiment 1 of the present utility model is shown in Figures 1 to 3 as follows. Figure 1 FIG. is a schematic structural diagram of an assembly structure of a plastic part 5 and a cover plate 4 on a battery provided in an embodiment of the present utility model. Figure 2 FIG. is a schematic structural diagram of a pole column 1 in an assembly structure of a plastic part 5 and a cover plate 4 on a battery provided in an embodiment of the present utility model. Figure 3 FIG. is a schematic structural diagram of the plastic part 5 in an assembly structure of a plastic part 5 and a cover plate 4 on a battery provided in an embodiment of the present utility model. An assembly structure of a plastic part 5 and a cover plate 4 on a battery provided in Embodiment 1 of the present utility model includes a pole column 1, a lower plastic part 2, a sealing ring 3, a cover plate 4, an upper plastic part 5 and a limiting part 6. The lower plastic part 2 and the sealing ring 3 are respectively sleeved on the pole column 1. The sealing ring 3 is respectively connected to the pole column 1 and the lower plastic part 2. The cover plate 4 and the upper plastic part 5 are respectively stacked on the lower plastic part 2. The cover plate 4 has a limiting groove 41, and the cover plate 4 and the upper plastic part 5 are respectively sleeved on the pole column 1. The limiting part 6 is disposed on the upper plastic part 5, and the limiting part 6 is mutually matched with the limiting groove 41. The limiting part 6 is embedded inside the limiting groove 41 located on the cover plate 4, and the limiting part 6 presents a tapered shape along the above-mentioned stacking direction.

[0027] Among them, the inside of the limiting groove 41 on the cover plate 4 has a space for accommodating the limiting part 6. For example, the cover plate 4 includes a cover body 42 and the limiting groove 41 disposed on the cover body 42. By embedding the limiting part 6 inside the limiting groove 41, the limiting part 6 is mutually connected with the cover body 42. The sealing ring 3 can adopt an O-shaped rubber sealing ring 3 to ensure good sealing effect of the sealing ring 3 under long-term use and different temperature conditions.

[0028] Among them, the stacking direction refers to as Figure 1In the vertical direction from bottom to top, the limiting member 6 is tapered along the stacking direction, and the limiting groove 41 is tapered in a shape matching the limiting member 6 along the stacking direction. At this time, it is not only convenient to install the limiting member 6 into the limiting groove 41, but also can provide a stronger locking force after assembly, effectively preventing loosening. In addition, an adhesive can be added to the contact surface between the upper plastic 5 and the cover plate 4 or hot melt connection can be adopted, which is beneficial to improving the connection strength between the upper plastic 5 and the cover plate 4.

[0029] In this embodiment, the lower plastic 2 and the sealing ring 3 are sleeved on the pole column 1, and the sealing ring 3 is connected to the pole column 1 and the lower plastic 2 respectively. The cover plate 4 of the limiting groove 41 and the upper plastic 5 are stacked on the lower plastic 2, and the cover plate 4 and the upper plastic 5 are respectively sleeved on the pole column 1. The limiting member 6 is arranged on the upper plastic 5 and matches the limiting groove 41. The limiting member 6 is embedded in the limiting groove 41 and is tapered along the stacking direction. In this way, through the cooperation of the limiting groove 41 and the tapered limiting member 6, the stable locking of the cover plate 4, the pole column 1 and the upper plastic 5 is realized, avoiding loosening or falling off caused by vibration or impact, effectively preventing relative movement between the cover plate 4 and the upper plastic 5, improving the compressive strength of the cover plate 4 at the same time, enhancing the sealing performance between the cover plate 4, the pole column 1 and the upper plastic 5, reducing the risk of short circuit caused by external leakage of electrolyte, and being beneficial to improving the battery safety performance. Thus, the technical effects of improving the sealing performance and enhancing the safety are achieved.

[0030] As an implementation manner, the pole column 1 includes a column body 11, and a boss 111 and a groove 112 that are sequentially arranged on the column body 11 along the stacking direction. The lower plastic 2 is connected to the column body 11, and the projection of the boss 111 on the lower plastic 2 along the stacking direction is located within the lower plastic 2. The sealing ring 3 is connected to the boss 111, and the projection of the sealing ring 3 on the boss 111 along the direction opposite to the stacking direction is located on the boss 111. The boss 111 and the groove 112 are sequentially arranged on the column body 11 along the stacking direction. The lower plastic 2 is tightly sleeved on the column body 11, and the projection of the boss 111 of the column body 11 on the lower plastic 2 is completely located inside the lower plastic 2, ensuring the effective support of the boss 111 for the lower plastic 2. The sealing ring 3 is tightly connected to the boss 111, and the projection of the sealing ring 3 along the direction opposite to the stacking direction is also completely located on the boss 111, that is, the projection of the sealing ring 3 along Figure 1 the vertically downward direction on the boss 111 is completely located on the boss 111, which not only increases the contact area between the pole column 1, the lower plastic 2 and the sealing ring 3, improves the stability of the connection, but also realizes the enhancement of the sealing effect between the sealing ring 3 and the boss 111 through the positioning effect of the boss 111 on the sealing ring 3, being beneficial to preventing the leakage of electrolyte.

[0031] In some embodiments, the upper plastic member 5 includes a main body 51, a first protrusion 52, and a second protrusion 53. The main body 51 is connected to the first protrusion 52 and the second protrusion 53 respectively. The first protrusion 52 is embedded inside the groove 112, and the second protrusion 53 is connected to the sealing ring 3 and is located between the pole column 1 and the cover plate 4. The main body 51 is connected to the limiting member 6. The main body 51, the first protrusion 52, the second protrusion 53, and the limiting member 6 can also be integrally formed to ensure that the limiting member 6 can be accurately embedded inside the limiting groove 41 of the cover plate 4. The first protrusion 52 can be embedded inside the groove 112 of the pole column 1 to achieve the mutual fixation between the upper plastic member 5 and the pole column 1. The second protrusion 53 is connected to the sealing ring 3 and is located between the pole column 1 and the cover plate 4, which can enhance the connection strength between the sealing ring 3 and the upper plastic member 5 and also improve the overall sealing performance. That is, through the cooperation of the first protrusion 52 and the groove 112, and the connection between the second protrusion 53 and the sealing ring 3, a multi-lock structure is jointly formed, which not only enhances the stability of the assembly structure but also reduces the risk of electrolyte leakage through the setting of multiple sealing layers. At the same time, the second protrusion 53, as an additional support point, also improves the compressive strength of the cover plate 4, enabling the entire battery assembly to maintain good performance under complex working conditions.

[0032] In some embodiments, the second protrusion 53 and the sealing ring 3 are perpendicular to each other. By setting the second protrusion 53 to be perpendicular to the sealing ring 3, the contact surface between the second protrusion and the sealing ring 3 is more stable, not prone to relative movement, reducing the loosening or falling-off phenomenon caused by vibration or impact, and achieving the improvement of the safety performance of the battery. At the same time, the perpendicularity between the second protrusion 53 and the sealing ring 3 also facilitates positioning during the installation and disassembly processes, improving production efficiency.

[0033] In some embodiments, the groove 112 located in the column body 11 can be annular, that is Figure 2 As shown in the side view of the column body 11, the groove 112 is integrally annular, which can facilitate the embedding and positioning of the first protrusion 52 inside the groove 112, making the contact between the groove 112 and the first protrusion 52 more uniform and improving the connection stability. The annular groove 112 enables the first protrusion 52 to be completely embedded inside the groove 112, achieving full contact and tight locking between the upper plastic member 5 and the pole column 1. Through the uniform distribution of the contact surface, the overall compressive capacity and sealing performance can also be improved.

[0034] In some embodiments, the limiting member 6 includes a connecting end 61 and a limiting end 62, and the limiting end 62 is connected to the connecting end 61. The connecting end 61 is along a direction opposite to the stacking direction, and the projection of the connecting end 61 on the limiting end 62 is located on the limiting end 62. The limiting groove 41 is annular, and the limiting groove 41 includes a groove bottom 411 and a groove wall 412. The groove wall 412 is connected to the groove bottom 411. The limiting end 62 is connected to the groove bottom 411, and the connecting end 61 is connected to the groove wall 412. The projection of the connecting end 61 along the direction opposite to the stacking direction on the limiting end 62 is located inside the limiting end 62, which enables the limiting member 6 to form a more stable locking structure when inserted into the limiting groove 41, preventing loosening or detachment caused by vibration or impact, achieving a tight fit and stable locking between the limiting member 6 and the limiting groove 41, and also facilitating the improvement of the sealing performance and safety performance by reducing the possibility of relative movement. Specifically, the limiting groove 41 includes a groove bottom 411 located below and a groove wall 412 located above the groove bottom 411. The tight connection between the limiting end 62 and the groove bottom 411, and the contact between the connecting end 61 and the groove wall 412 together constitute a stable support system, effectively preventing loosening or detachment caused by vibration or impact. At the same time, it will improve the overall compressive strength of the assembly structure, enhance the sealing performance, reduce the risk of short circuit caused by electrolyte leakage, and improve the safety performance of the battery.

[0035] In some embodiments, the limiting member 6 is in an inverted T shape, that is, the connecting end 61 and the limiting end 62 are integrally formed into an inverted T-shaped structure. The limiting member 6 in an inverted T shape enables the limiting member 6 to form a more stable support structure after being inserted into the limiting groove 41. The tight contact between the limiting end 62 of the limiting member 6 in an inverted T shape and the bottom of the limiting groove 41 effectively prevents the limiting member 6 from moving in the vertical direction. The connection between the connecting end 61 in an inverted T shape and the upper plastic 5, and at the same time, the connecting end 61 is in close contact with the groove wall 412, which will ensure the stability of the limiting member 6 in the horizontal direction, facilitate the enhancement of the stability and sealing performance of the assembly structure, reduce the risk of electrolyte leakage, and improve the safety performance of the battery.

[0036] In some embodiments, the limiting member 6 is in a conical shape, that is, the connecting end 61 and the limiting end 62 are integrally formed into an inverted conical structure. The limiting member 6 in a conical shape gradually expands along the stacking direction. The tip portion of the limiting member 6 serves as the connecting end 61 and is connected to the upper plastic 5, and the wider portion of the limiting member 6 serves as the limiting end 62 and is embedded inside the limiting groove 41, so that the limiting member 6 can form a tighter locking effect when being embedded in the limiting groove 41, and then a greater locking force can be generated after the limiting member 6 is embedded in the limiting groove 41. At the same time, the conical structure also facilitates the installation and disassembly of the limiting member 6. In the locked state, the limiting end 62 of the conical limiting member 6 is in close contact with the bottom of the limiting groove 41, effectively preventing loosening or falling off. The connection between the connecting end 61 of the limiting member 6 and the upper plastic 5 ensures the stability of the entire assembly structure, which not only helps to improve the compressive strength and sealing performance of the assembly structure, but also reduces the risk of electrolyte leakage and enhances the safety performance of the battery.

[0037] To illustrate in detail a battery provided by the present utility model, the above-mentioned Embodiment 1 has described in detail the assembly structure of the upper plastic 5 and the cover plate 4 of a battery. Based on the same inventive concept, the present application also provides a battery, as detailed in Embodiment 2.

[0038] Embodiment 2 of the present utility model provides a battery, the battery includes a lithium-ion battery, and also includes the assembly structure of the upper plastic 5 and the cover plate 4 of the battery.

[0039] The present utility model provides a battery. By sleeving the lower plastic 2 and the sealing ring 3 on the pole column 1, the sealing ring 3 is respectively connected to the pole column 1 and the lower plastic 2. The cover plate 4 of the limiting groove 41 and the upper plastic 5 are stacked on the lower plastic 2, and the cover plate 4 and the upper plastic 5 are respectively sleeved on the pole column 1. The limiting member 6 is arranged on the upper plastic 5 and is matched with the limiting groove 41, and the limiting member 6 is embedded in the limiting groove 41. The limiting member 6 is in a tapered shape along the stacking direction. In this way, through the cooperation of the limiting groove 41 and the tapered limiting member 6, the stable locking of the cover plate 4, the pole column 1 and the upper plastic 5 is realized, avoiding loosening or falling off caused by vibration or impact, effectively preventing the relative movement between the cover plate 4 and the upper plastic 5, and at the same time improving the compressive strength of the cover plate 4, enhancing the sealing performance between the cover plate 4, the pole column 1 and the upper plastic 5, reducing the risk of short circuit caused by electrolyte leakage, and being beneficial to improving the safety performance of the battery. Thus, the technical effects of improving the sealing performance and enhancing the safety performance are achieved.

[0040] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present utility model and are not restrictive. Although the present utility model has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. An assembly structure of plastic and cover on a battery, characterized in that: The assembly structure includes: a pole, a lower plastic and a sealing ring sleeved on the pole, a cover plate with a limiting groove and an upper plastic stacked on the lower plastic, a limiting member matched with the limiting groove and arranged on the upper plastic, the sealing ring is respectively connected to the pole and the lower plastic, the cover plate and the upper plastic are respectively sleeved on the pole; the limiting member is embedded in the limiting groove, and the limiting member is tapered along the stacking direction.

2. The assembly structure of the battery upper plastic and the cover plate according to claim 1, characterized in that: The pole includes a column and a boss and a groove sequentially arranged on the column along the stacking direction; the lower plastic is connected to the column, and the projection of the boss on the lower plastic along the stacking direction is located on the lower plastic; the sealing ring is connected to the boss, and the projection of the sealing ring on the boss in the opposite direction of the stacking direction is located on the boss.

3. The assembly structure of the battery upper plastic and the cover plate according to claim 2, characterized in that: The upper plastic includes a main body and a first protrusion and a second protrusion respectively connected to the main body, the main body is connected to the limiter, the first protrusion is embedded in the groove, the second protrusion is connected to the sealing ring, and the second protrusion is located between the pole and the cover plate.

4. The assembly structure of the battery upper plastic and the cover plate according to claim 3, characterized in that: The second protrusion is perpendicular to the sealing ring.

5. The assembly structure of the battery upper plastic and the cover plate according to claim 3, characterized in that: The groove is annular.

6. The assembly structure of the battery upper plastic and the cover plate according to claim 1, characterized in that: The limiting member comprises a connecting end and a limiting end connected to the connecting end, and a projection of the connecting end on the limiting end in a direction opposite to the stacking direction is located at the limiting end.

7. The assembly structure of the battery upper plastic and the cover plate according to claim 6, characterized in that: The limiting groove is annular, and comprises a groove bottom and a groove wall connected to the groove bottom, the limiting end is connected to the groove bottom, and the connecting end is connected to the groove wall.

8. The assembly structure of the battery upper plastic and the cover plate according to claim 1, characterized in that: The limiting member is in an inverted T shape.

9. The assembly structure of the battery upper plastic and the cover plate according to claim 1, characterized in that: The limiting member is conical.

10. A battery, characterized in that: The battery comprises the assembly structure of plastic and cover plate on the battery as claimed in any one of claims 1 to 9.

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