Upper plastic part for battery top cover, battery and energy storage device

Abstract

The utility model discloses an upper plastic part for a battery top cover, a battery and an energy storage device, which belong to the technical field of battery manufacturing, and comprise a post terminal, a lower plastic part and a sealing ring which are sleeved on the post terminal, a cover plate which is laminated on the lower plastic part and is provided with a matching groove, and an upper plastic part, the positioning matching part is arranged on the upper plastic part and is matched with the matching groove; the sealing ring is respectively connected with the post terminal and the lower plastic part; the cover plate and the upper plastic part are respectively arranged on the pole in a sleeving manner; the positioning matching part comprises an annular connecting piece connected with the upper plastic part and an annular cone-shaped body connected with the annular connecting piece, the annular cone-shaped body is located between the annular connecting piece and the sealing ring, the center line of the annular connecting piece is parallel to the center line of the annular cone-shaped body, the annular cone-shaped body is located in the matching groove, and the annular cone-shaped body is connected with the sealing ring. And the annular connecting piece is at least partially embedded into the matching groove. According to the utility model, the technical effect of improving the sealing performance and the safety is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery manufacturing technical field, especially relate to a kind of for the upper plastic piece of battery top cover, battery and energy storage device. BACKGROUND

[0002] In the lithium ion battery manufacturing industry, the sealing performance of cover plate pole is the key link to ensure the safety of battery. At present, in the battery manufacturing technology, the battery top cover structure is mainly composed of pole, upper plastic, cover plate, lower plastic and sealing ring. However, when the positive and negative poles on the cover plate of finished square aluminum shell battery are subjected to external force, and the external force exceeds the stress limit value of the existing design cover plate, the pole is prone to the phenomenon of getting off the bed. The getting off the bed of the pole will cause the displacement or deformation of the sealing ring, resulting in the failure of the sealing of the battery. If the sealing of the battery is damaged, the electrolyte inside the battery may leak out, and the leaked electrolyte may contact other parts of the battery, which may cause electrode short circuit and serious safety problems.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. INVENTION CONTENTS

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

[0005] To solve the above technical problems, the utility model provides an upper plastic piece for battery top cover, which comprises a pole, a lower plastic piece and a sealing ring sleeved on the pole, a cover plate with a matching groove stacked on the lower plastic piece, an upper plastic piece, and a positioning matching part provided on the upper plastic piece and matched with the matching groove, wherein the sealing ring is connected with the pole and the lower plastic piece respectively; the cover plate and the upper plastic piece are sleeved on the pole respectively; the positioning matching part comprises an annular connecting piece connected with the upper plastic piece, and an annular conical body connected with the annular connecting piece, wherein the annular conical body is located between the annular connecting piece and the sealing ring, the center line of the annular connecting piece is parallel to the center line of the annular conical body, the annular conical body is located in the matching groove, and the annular connecting piece is at least partially embedded in the matching groove.

[0006] Optionally, the annular conical body comprises two side surfaces inclined to each other, and annular support surfaces connected with the two side surfaces respectively, wherein the annular support surfaces are connected with the annular connecting piece, the intersection point of the two side surfaces is located on the projection of the annular connecting piece in the direction close to the annular connecting piece, and the center line of the annular support surface is parallel to the center line of the annular connecting piece.

[0007] Optionally, the matching groove is annular, and the matching groove comprises a bottom wall and a side wall connected with the bottom wall, and two side surfaces are in contact with the side wall respectively.

[0008] Optionally, the annular support surface is parallel to the sealing ring, and the annular support surface is perpendicular to the annular connecting piece.

[0009] Optionally, the pole comprises a column body and a limiting table and a limiting groove arranged on the column body respectively, the lower plastic piece is connected with the column body, and a projection of the limiting table on the lower plastic piece in a stacking direction is located on the lower plastic piece, the sealing ring is connected with the limiting table, and a projection of the sealing ring on the limiting table in an opposite direction of the stacking direction is located on the limiting table.

[0010] Optionally, the upper plastic piece comprises a main body and a first limiting piece and a second limiting piece connected with the main body respectively, the first limiting piece and the second limiting piece are perpendicular to each other, the main body is connected with the annular connecting piece, the first limiting piece is embedded in the limiting groove, the second limiting piece is connected with the sealing ring, and the second limiting piece is located between the pole and the cover plate.

[0011] Optionally, the upper plastic piece and the positioning matching part are integrally formed.

[0012] Optionally, the annular conical body is triangular when viewed from a cross section of the annular conical body.

[0013] According to another aspect of the utility model, the utility model also provides a battery, the battery comprises the upper plastic piece for battery top cover.

[0014] According to another aspect of the utility model, the utility model also provides a battery, the battery comprises the upper plastic piece for battery top cover.

[0015] Beneficial effects:

[0016] The utility model provides a kind of upper plastic part for battery top cover, by being equipped with lower plastic part and sealing ring on pole, sealing ring is connected with pole and lower plastic part respectively, cover plate and upper plastic part with mating groove are laminated in lower plastic part, cover plate and upper plastic part are equipped with in pole. Positioning cooperation part is arranged in upper plastic part, positioning cooperation part and mating groove are mutually matched, the annular connecting piece of positioning cooperation part is connected with upper plastic part, annular conical body is connected with annular connecting piece, annular conical body is located between annular connecting piece and sealing ring, the center line of annular connecting piece and the center line of annular conical body are mutually parallel, annular conical body is located in the inside of mating groove, and annular connecting piece is at least partially embedded in the inside of mating groove. Such as the annular conical body of positioning cooperation part located in upper plastic part is embedded in the inside of mating groove located in cover plate, so that cover plate, upper plastic part and pole are mutually fixed locking, ensure that upper plastic part does not occur when being stressed to separate or displace, can improve the stability and stress capacity of upper plastic part, improve the compressive strength of cover plate. So as to reach the technical effect of improving sealing and security. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 A structure diagram of the upper plastic part for the battery top cover is provided for the embodiments of the present application.

[0019] Figure 2 A structure diagram of the cover plate in the upper plastic part for the battery top cover is provided for the embodiments of the present application.

[0020] Figure 3 A structure diagram of the side surface in the upper plastic part for the battery top cover is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as limiting the present application.

[0022] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings of the embodiments of the present application, so that those skilled in the art can better understand the solutions of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0023] In the embodiments of the present application, at least one refers to one or more; multiple refers to two or more than two. In the description of the present application, the terms "first", "second", "third" and the like are only used for distinguishing the purpose of description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying order.

[0024] In the description of the present application, the terms "one embodiment" or "some embodiments" and the like mean that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, in the present application, the terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized. It should be noted that in the embodiments of the present application, the "and / or" description of the associated objects represents that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B simultaneously, and the existence of B alone.

[0025] It should be noted that in the embodiments of the present application, when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be a middle component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a middle component. When a component is considered to be "set on" another component, it can be directly set on the other component or there can be a middle component. 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 elements can be direct or indirect connection between two electrical elements. For example, A and B are connected, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present application are only for illustrative purposes, and are not intended to limit the present application.

[0026] The upper plastic part for the battery top cover provided by the embodiment of the present application, please refer to Figures 1 to 3 The structure diagram of the upper plastic part for the battery top cover provided by the embodiment of the present application is shown in Figure 1 The structure diagram of the upper plastic part for the battery top cover provided by the embodiment of the present application is shown in Figure 2Is a structure schematic view of the cover plate 4 in the upper plastic part for the battery top cover, Figure 3 Is a structure schematic view of the side surface 621 in the upper plastic part for the battery top cover. The upper plastic part for the battery top cover provided by the embodiment of the utility model includes the pole 1, the cover plate 4, the upper plastic part 5 and the positioning matching part 6, the lower plastic part 2 and the sealing ring 3 are respectively sleeved on the pole 1, and the sealing ring 3 is connected with the pole 1 and the lower plastic part 2 respectively. The cover plate 4 and the upper plastic part 5 are stacked on the lower plastic part 2, the cover plate 4 has the matching groove 41, the cover plate 4 and the upper plastic part 5 are respectively sleeved on the pole 1, the positioning matching part 6 is arranged on the upper plastic part 5, and the positioning matching part 6 is matched with the matching groove 41, the positioning matching part 6 includes the annular connecting piece 61 and the annular conical body 62, the annular connecting piece 61 is connected with the upper plastic part 5, the annular conical body 62 is connected with the annular connecting piece 61, the annular conical body 62 is located between the annular connecting piece 61 and the sealing ring 3, the center line of the annular connecting piece 61 is parallel with the center line of the annular conical body 62, the annular conical body 62 is located in the inside of the matching groove 41, and the annular connecting piece 61 is at least partially embedded in the inside of the matching groove 41.

[0027] Wherein, the pole 1 is surrounded by the lower plastic part 2 and the sealing ring 3, ensuring the initial sealing and stability. The cover plate 4 is connected with the positioning matching part 6 of the upper plastic part 5 through the matching groove 41 on the cover plate 4. The annular connecting piece 61 of the positioning matching part 6 is directly connected with the upper plastic part 5 as part of the main body 51, providing structural support. The annular conical body 62 of the positioning matching part 6 can be conveniently inserted into the inside of the matching groove 41, and the annular conical body 62 can also provide additional fastening force after insertion, effectively preventing the upper plastic part 5 from being separated or displaced when under stress. After the center lines of the annular connecting piece 61 and the annular conical body 62 are parallel to each other, the balance and stability of the entire structure are ensured, avoiding assembly difficulties or performance degradation due to angle deviation. In addition, the annular conical body 62 is completely embedded in the inside of the matching groove 41, and the annular connecting piece 61 is at least partially embedded in the inside of the matching groove 41, which is beneficial to enhancing the connection strength between the components, so that the entire battery top cover structure can maintain high stability and compression strength when subjected to external force.

[0028] In the embodiment, the lower plastic part 2 and the sealing ring 3 are sleeved on the pole 1, the sealing ring 3 is connected with the pole 1 and the lower plastic part 2 respectively, the cover plate 4 with the matching groove 41 and the upper plastic part 5 are stacked on the lower plastic part 2, and the cover plate 4 and the upper plastic part 5 are sleeved on the pole 1. The positioning matching part 6 is arranged on the upper plastic part 5, the positioning matching part 6 is matched with the matching groove 41, the annular connecting piece 61 of the positioning matching part 6 is connected with the upper plastic part 5, the annular tapered body 62 is connected with the annular connecting piece 61, the annular tapered body 62 is located between the annular connecting piece 61 and the sealing ring 3, the center line of the annular connecting piece 61 is parallel to the center line of the annular tapered body 62, the annular tapered body 62 is located in the inside of the matching groove 41, and the annular connecting piece 61 is at least partially embedded in the inside of the matching groove 41. In this way, the annular tapered body 62 of the positioning matching part 6 located on the upper plastic part 5 is embedded in the inside of the matching groove 41 located on the cover plate 4, so that the cover plate 4, the upper plastic part 5 and the pole 1 are fixed and locked with each other, the disengagement or displacement of the upper plastic part 5 under stress is avoided, the stability and stress capacity of the upper plastic part 5 are improved, and the compression strength of the cover plate 4 is improved. Thus, the technical effects of improving the sealing performance and safety are achieved.

[0029] As an implementation manner, the annular tapered body 62 comprises an annular supporting surface 622 and two side surfaces 621, the two side surfaces 621 are obliquely intersected with each other, the annular supporting surface 622 is connected with the two side surfaces 621 respectively, the annular supporting surface 622 is connected with the annular connecting piece 61, the intersection point 623 of the two side surfaces 621 is located on the annular connecting piece 61 along the direction close to the annular connecting piece 61, and the center line of the annular supporting surface 622 is parallel to the center line of the annular connecting piece 61. Figure 3 As shown in the figure, the two side surfaces 621 can be the inner and outer two side surfaces 621 of the annular tapered body 62, the annular supporting surface 622 and the annular connecting piece 61 can be annular respectively from the observation along the length extension direction of the pole 1, the annular supporting surface 622 is connected with the annular connecting piece 61, the projection of the intersection point 623 of the two side surfaces 621 on the annular connecting piece 61 is located above the annular connecting piece 61 itself, and the stability and compactness of the structure can be ensured. The two obliquely intersected side surfaces 621 can make the annular tapered body 62 provide more uniform distribution force and stronger locking effect when being embedded in the matching groove 41 of the cover plate 4.

[0030] In some embodiments, the fitting groove 41 is annular, and the fitting groove 41 includes a bottom wall 411 and a side wall 412 connected with the bottom wall 411, and the two side surfaces 621 are in contact with the side wall 412 respectively. From the direction along the length of the pole 1, the fitting groove 41 can be annular, and the bottom wall 411 and the side wall 412 form the fitting groove 41, and the inside of the fitting groove 41 has a space for accommodating the annular conical body 62, and the annular fitting groove 41 is tightly fitted with the annular conical body 62, so that the upper plastic part 5 can more effectively disperse and resist external force when subjected to external force, which is beneficial to improve the compressive strength and stability of the entire structure, and also helps to reduce the risk of damage due to stress concentration, prolonging the service life of the battery top cover.

[0031] In some embodiments, the annular support surface 622 is parallel to the sealing ring 3, and the annular support surface 622 is perpendicular to the annular connecting piece 61, which is beneficial to improve the accuracy and consistency of the upper plastic part 5 during assembly, and can reduce the risk of performance degradation due to assembly errors, and improve the sealing and safety of the entire battery top cover.

[0032] In some embodiments, the pole 1 includes a column 11, a limiting table 12 and a limiting groove 13 arranged on the column 11 respectively. The lower plastic part 2 is connected with the column 11, and the limiting table 12 is projected on the lower plastic part 2 along the stacking direction. The sealing ring 3 is connected with the limiting table 12, and the sealing ring 3 is projected on the limiting table 12 along the opposite direction of the stacking direction. Through the limiting table 12 and the limiting groove 13, additional support and fixation can be provided for the connection between the pole 1, the lower plastic part 2 and the sealing ring 3, which is beneficial to improve the stability of the entire structure, and also helps to prevent loosening or damage caused by vibration or impact.

[0033] In some embodiments, the upper plastic part 5 includes a main body 51, a first limiting part 52 and a second limiting part 53, the first limiting part 52 and the second limiting part 53 are connected with the main body 51 respectively, the first limiting part 52 and the second limiting part 53 are perpendicular to each other, the main body 51 is connected with the annular connecting piece 61, the first limiting part 52 is embedded in the inside of the limiting groove 13, the second limiting part 53 is connected with the sealing ring 3, and the second limiting part 53 is located between the pole 1 and the cover plate 4, which can provide additional fixation and support for the upper plastic part 5, not only improving the stability and stress capacity of the entire structure, but also helping to prevent displacement or damage caused by external force.

[0034] In some embodiments, the upper plastic part 5 and the positioning and matching part 6 are integrally formed, the integrally formed upper plastic part 5 and the positioning and matching part 6 can make the connection between the upper plastic part 5 and the positioning and matching part 6 more firm and reliable, and can more effectively disperse and resist external force when stressed, thereby preventing the upper plastic part 5 from being separated or displaced.

[0035] In some embodiments, the annular conical body 62 appears to be a triangle when viewed from the cross section of the annular conical body 62, as shown in the figure. Figure 1 As shown in the figure, the cross section of the annular conical body 62 can appear to be a triangle when viewed from the cross section of the annular conical body 62. The triangular annular conical body 62 can be more closely in contact with the groove wall when embedded in the matching groove 41, forming a stronger locking force, which not only enhances the connection strength between the upper plastic part 5 and the cover plate 4, but also improves the compression strength of the entire battery top cover. Meanwhile, the triangular annular conical body 62 can more effectively disperse and resist external force when stressed, thereby improving the sealing and safety.

[0036] In order to make a detailed description of the battery provided by the utility model, the above-mentioned embodiment one makes a detailed description of the upper plastic part for the battery top cover, and based on the same utility model concept, the application further provides a battery, which is described in detail in embodiment two.

[0037] The utility model embodiment two provides a battery, the battery includes the upper plastic part for the battery top cover.

[0038] The utility model provides a battery, through setting down plastic part 2 and sealing ring 3 on pole 1, sealing ring 3 is connected with pole 1 and down plastic part 2 respectively, cover plate 4 and upper plastic part 5 are stacked in down plastic part 2 with the cooperation groove 41, and cover plate 4 and upper plastic part 5 are set on pole 1 respectively. Positioning and matching part 6 is arranged in upper plastic part 5, positioning and matching part 6 is matched with cooperation groove 41, the annular connecting piece 61 of positioning and matching part 6 is connected with upper plastic part 5, the annular conical body 62 is connected with the annular connecting piece 61, the annular conical body 62 is located between the annular connecting piece 61 and sealing ring 3, the center line of the annular connecting piece 61 and the center line of the annular conical body 62 are parallel to each other, the annular conical body 62 is located in the inside of cooperation groove 41, and the annular connecting piece 61 is at least partially embedded in the inside of cooperation groove 41. In this way, the annular conical body 62 of the positioning and matching part 6 located in the upper plastic part 5 is embedded in the inside of the cooperation groove 41 located in the cover plate 4, so that the cover plate 4, the upper plastic part 5 and the pole 1 are fixed and locked with each other, ensuring that the upper plastic part 5 will not be separated or displaced when stressed, and the stability and stress capacity of the upper plastic part 5 can be improved, and the compression strength of the cover plate 4 is improved. Thus, the technical effect of improving the sealing and safety is achieved.

[0039] In order to provide a kind of energy storage device of the utility model, the above embodiment one has made detailed description to the upper plastic part for battery top cover, based on the same utility model concept, the present application also provides a kind of energy storage device, see detailed embodiment three.

[0040] The utility model embodiment three provides a kind of energy storage device, the energy storage device includes above-mentioned battery.

[0041] The utility model provides a kind of energy storage device, by being equipped with lower plastic part 2 and sealing ring 3 on pole 1, sealing ring 3 is connected with pole 1 and lower plastic part 2 respectively, cover plate 4 and upper plastic part 5 with cooperation groove 41 are stacked in lower plastic part 2, cover plate 4 and upper plastic part 5 are equipped in pole 1 respectively.Positioning cooperation part 6 is arranged in upper plastic part 5, positioning cooperation part 6 and cooperation groove 41 are mutually matched, the annular connecting piece 61 of positioning cooperation part 6 is connected with upper plastic part 5, annular conical body 62 is connected with annular connecting piece 61, annular conical body 62 is located between annular connecting piece 61 and sealing ring 3, the center line of annular connecting piece 61 and the center line of annular conical body 62 are mutually parallel, annular conical body 62 is located inside cooperation groove 41, and annular connecting piece 61 is at least partially embedded inside cooperation groove 41.This will be embedded in the inside of cooperation groove 41 of cover plate 4 of the annular conical body 62 of positioning cooperation part 6 located in upper plastic part 5, so that cover plate 4, upper plastic part 5 and pole 1 are mutually fixed locking, ensure that upper plastic part 5 does not occur when being forced to separate or displace, can improve the stability and stress capacity of upper plastic part 5, improve the compressive strength of cover plate 4.Thereby reach the technical effect of improving sealing and security.

[0042] Finally, it should be noted that the above specific embodiments are merely used to illustrate the technical solutions of the utility model and not to limit, although the utility model is described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and they should be covered in the scope of claims of the utility model.

Claims

1. An upper plastic member for a battery top cover, characterized by, The upper plastic part for the battery top cover comprises a pole, a lower plastic part and a sealing ring sleeved on the pole, a cover plate with a matching groove stacked on the lower plastic part and an upper plastic part, and a positioning matching part arranged on the upper plastic part and matched with the matching groove, the sealing ring is connected with the pole and the lower plastic part respectively; the cover plate and the upper plastic part are sleeved on the pole respectively; the positioning matching part comprises a ring-shaped connecting piece connected with the upper plastic part, and a ring-shaped conical body connected with the ring-shaped connecting piece, the ring-shaped conical body is located between the ring-shaped connecting piece and the sealing ring, the center line of the ring-shaped connecting piece is parallel to the center line of the ring-shaped conical body, the ring-shaped conical body is located in the matching groove, and the ring-shaped connecting piece is at least partially embedded in the matching groove.

2. The upper plastic piece for a battery top cover according to claim 1, wherein: The ring-shaped conical body comprises two side surfaces which are obliquely intersected with each other, and ring-shaped support surfaces connected with the two side surfaces respectively, the ring-shaped support surfaces are connected with the ring-shaped connecting piece, the intersection point of the two side surfaces is located on the ring-shaped connecting piece in the direction close to the ring-shaped connecting piece, and the center line of the ring-shaped support surface is parallel to the center line of the ring-shaped connecting piece.

3. The overmold for a battery header of claim 2, wherein: The matching groove is annular, and comprises a bottom wall and a side wall connected with the bottom wall, the two side surfaces are in contact with the side wall respectively.

4. The overmold for a battery header of claim 2, wherein: The ring-shaped support surface is parallel to the sealing ring, and the ring-shaped support surface is perpendicular to the ring-shaped connecting piece.

5. The overmold for a battery header of claim 1, wherein: The pole comprises a pole body and a limiting table and a limiting groove arranged on the pole body respectively; the lower plastic part is connected with the pole body, and the projection of the limiting table on the lower plastic part in the stacking direction is located on the lower plastic part; the sealing ring is connected with the limiting table, and the projection of the sealing ring on the limiting table in the opposite direction of the stacking direction is located on the limiting table.

6. The overmold for a battery header of claim 5, wherein: The upper plastic part comprises a main body and first and second limiting members connected with the main body respectively, the first and second limiting members are perpendicular to each other, the main body is connected with the ring-shaped connecting piece, the first limiting member is embedded in the limiting groove, the second limiting member is connected with the sealing ring, and the second limiting member is located between the pole and the cover plate.

7. The overmold for a battery header of claim 1, wherein: The upper plastic part and the positioning matching part are integrally formed.

8. The overmold for a battery header of claim 1, wherein: The ring-shaped conical body is triangular when viewed from the cross section of the ring-shaped conical body.

9. A battery, characterized by The battery comprises the upper plastic part for the battery top cover according to any one of claims 1 to 8.

10. An energy storage device, characterized by, The energy storage device comprises the battery according to claim 9.

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