Rotary lithium battery cap

Abstract

The utility model relates to a rotary lithium battery cap, which comprises a cap body, a cover cylinder and an inner cylinder, the cover cylinder is perpendicular to the cap body, the cap body and the cover cylinder are integrally formed, the outer edge size of the inner cylinder is matched with the inner edge size of the cover cylinder, the inner wall of the inner cylinder is provided with internal threads, and the inner cylinder is pressed in the cover cylinder. According to the utility model, the inner cylinder body internally provided with the internal threads is pressed in the cover cylinder, the inner cylinder body and the cover body jointly form a whole cover cap, a traditional welding mode is replaced by rotating and screwing the threads, the inner cylinder body is fixed with a lithium battery shell, the assembly is convenient and fast, welding is not needed, the processing cost is low, and the cover cap is convenient to disassemble and replace; therefore, the overall structural strength of the cap can be improved, the cap is not prone to deformation and can bear high collision impact, and the safety performance of the lithium battery is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, concretely is a rotary lithium battery cap. BACKGROUND

[0002] Lithium battery is a kind of high energy density, lightweight secondary battery, is widely used in consumer electronics, electric vehicles and energy storage systems, its core is composed of positive pole, negative pole, diaphragm and electrolyte, positive pole material is usually lithium cobaltate, lithium manganate, lithium iron phosphate or ternary material, negative pole is graphite or silicon-based material, diaphragm is used to isolate positive pole and negative pole to prevent short circuit, electrolyte is lithium salt dissolved in organic solvent.

[0003] Lithium battery cap is the important safety component at the top of lithium battery, and the traditional battery cap is usually fixedly connected with battery shell by welding, and welding not only has high processing cost, but also has more complicated procedures. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a rotary lithium battery cap, effectively solve the problem raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme.

[0006] A rotary lithium battery cap, including cover, cover cylinder and inner cylinder, cover cylinder is perpendicular to cover, cover and cover cylinder are integrally formed, inner cylinder outer edge size and cover cylinder inner edge size are adapted, inner thread is formed on inner cylinder inner wall, and inner cylinder is press-fitted in cover cylinder.

[0007] Therefore, the inner cylinder with inner thread is press-fitted in the cover cylinder, and the cover cap is formed as a whole with the cover, the thread rotation is used instead of the traditional welding mode, and the lithium battery shell is fixed, so that the assembly is convenient and fast, welding is not needed, the processing cost is low, the cover cap is convenient to disassemble and replace, the inner cylinder and the cover cylinder are double-layer combined layout, so that the structural strength of the cover cap as a whole can be increased, the cover cap is not easy to deform, can withstand strong collision impact, and the safety performance of the lithium battery is effectively improved.

[0008] Further, the cover cylinder inner wall is provided with an annular embedding groove close to the cover, and the inner cylinder end portion is arranged with a bottom skirt around the axis, when the inner cylinder is press-fitted into the cover cylinder, the bottom skirt is correspondingly pressed into the embedding groove, and clamping is realized.

[0009] Further, before the inner cylinder is press-fitted in place, each bottom skirt is in an outwardly inclined state, and the bottom skirt is made of aluminum.

[0010] The bottom skirt is pressed into the embedding groove to realize the embedding and fixing of the inner cylinder and the cover cylinder; when a large amount of gas is generated due to the decomposition of electrolyte caused by high temperature in the battery, the pressure in the battery instantaneously increases, the bottom skirt is deformed and separated from the embedding groove due to the deformability of the aluminum product, so that the cover body and the cover cylinder are separated as a whole, the pressure relief effect is realized, the explosion of the lithium battery is effectively prevented, in addition, the inner cylinder can be pulled out from the cover cylinder by using pliers during the recycling of the lithium battery, the classification and recycling are facilitated, and two effects are achieved at one time.

[0011] Further, the outer edge wall of the inner cylinder is arranged with limiting blocks in an array mode, and the inner edge wall of the cover cylinder is uniformly arranged with positioning grooves for corresponding matching insertion of the limiting blocks.

[0012] When the inner cylinder is assembled into the cover cylinder, the limiting blocks are correspondingly and slidably inserted into the positioning grooves, so that the limiting effect of the inner cylinder and the cover cylinder is realized, the self-rotation of the cover cylinder and the cover body is prevented during screwing, and it is ensured that the end cap can be normally screwed by using the internal thread.

[0013] Further, the outer edge wall of the inner cylinder is arranged with side grooves above the two limiting blocks located therein, and the clearance is formed between the two side grooves and the corresponding positioning grooves when the inner cylinder is press-fitted into the cover cylinder.

[0014] The clearance formed by the positioning grooves and the side grooves can provide space for the pliers, so that the pliers can be conveniently inserted to clamp and pull out the inner cylinder.

[0015] Further, the cover body is provided with a through positive electrode hole and a through negative electrode hole.

[0016] Compared with the prior art, the utility model has the beneficial effects as follows.

[0017] 1. The inner cylinder with an internal thread is press-fitted in the cover cylinder to form a cover cap as a whole with the cover body, the screwing rotation is used instead of the traditional welding mode to fix the lithium battery shell, the assembly is convenient and fast, welding is not needed, the processing cost is low, the cover cap can be conveniently disassembled and replaced, the inner cylinder and the cover cylinder are arranged in a double-layer combination mode, so that the structural strength of the cover cap as a whole can be increased, the cover cap is not easy to deform, can withstand strong impact, and the safety performance of the lithium battery is effectively improved.

[0018] 2. When a large amount of gas is generated due to the decomposition of electrolyte caused by high temperature in the battery, the pressure in the battery instantaneously increases, the bottom skirt is deformed and separated from the embedding groove due to the deformability of the aluminum product, so that the cover body and the cover cylinder are separated as a whole, the pressure relief effect is realized, the explosion of the lithium battery is effectively prevented, in addition, the inner cylinder can be pulled out from the cover cylinder by using pliers during the recycling of the lithium battery, the classification and recycling are facilitated, and two effects are achieved at one time. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 This is one of the three-dimensional schematic diagrams of the overall structure of this utility model;

[0020] Figure 2 This is the second three-dimensional schematic diagram of the overall structure of this utility model;

[0021] Figure 3 This is a schematic cross-sectional view of the present invention.

[0022] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0023] Figure 5 This is a schematic diagram of the inner cylinder structure in this utility model;

[0024] Figure 6 This is a schematic diagram of the cross-sectional structure of the inner cylinder in this utility model.

[0025] In the diagram: 01, clearance opening; 1, cover; 11, positive electrode hole; 12, negative electrode hole; 2, cover; 21, embedding groove; 22, positioning groove; 3, inner cylinder; 31, internal thread; 32, bottom skirt; 33, limiting block; 34, side groove. Detailed Implementation

[0026] 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.

[0027] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0028] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0029] Please see Figures 1-6 The present invention provides a rotary lithium battery cap, comprising a cap body 1, a cover cylinder 2 and an inner cylinder 3. The cover cylinder 2 is arranged perpendicular to the cap body 1. The cap body 1 and the cover cylinder 2 are integrally formed. The outer edge size of the inner cylinder 3 is adapted to the inner edge size of the cover cylinder 2. An internal thread 31 is provided on the inner wall of the inner cylinder 3. The inner cylinder 3 is press-fitted into the cover cylinder 2.

[0030] The rotary lithium battery cap provided by this utility model presses the inner cylinder 3 with internal threads 31 into the cover cylinder 2, forming a cap together with the cover body 1. The screw rotation replaces the traditional welding method to fix it to the lithium battery shell. The assembly is convenient and quick, no welding is required, the processing cost is low, and the cap is easy to disassemble and replace.

[0031] In addition, the internal thread 31 is provided on the inner wall of the inner cylinder 3, and the inner cylinder 3 is then pressed into the cover cylinder 2. The inner cylinder 3 and the cover cylinder 2 are a double-layer combined layout, which can increase the overall structural strength of the cap, making the cap less prone to deformation and able to withstand strong impacts, thereby effectively improving the safety performance of the lithium battery.

[0032] Specifically, an annular embedding groove 21 is provided on the inner wall of the cover cylinder 2 near the cover body 1, and a bottom skirt 32 is arranged in an array around the end of the inner cylinder 3 along its axis. When the inner cylinder 3 is pressed into the cover cylinder 2, the bottom skirt 32 is pressed into the embedding groove 21 to achieve a snap-fit. By pressing the bottom skirt 32 into the embedding groove 21, the inner cylinder 3 and the cover cylinder 2 are fixedly installed.

[0033] Before the inner cylinder 3 is pressed into place, each bottom skirt 32 is inclined outward. During pressing, the bottom skirt 32 contacts the inner surface of the cover 1. The inclined bottom skirt 32 is easy to press into the embedding groove 21. The bottom skirt 32 is made of aluminum. Aluminum products are easy to deform, which makes it easy to press into the embedding groove 21.

[0034] By pressing the bottom skirt 32 into the embedding groove 21, the inner cylinder 3 and the cover 2 are fixedly installed. When the battery is severely heated and the electrolyte decomposes to produce a large amount of gas, the pressure inside the battery increases instantly. Since the bottom skirt 32 is made of aluminum, it has the characteristic of being deformable. The high pressure causes the bottom skirt 32 to come out of the embedding groove 21, thereby opening the cover 1 and the cover 2 as a whole, achieving the effect of pressure relief and effectively preventing the lithium battery from exploding. In addition, when recycling lithium batteries, the deformable characteristic of the bottom skirt 32 can be used to easily pull the inner cylinder 3 out of the cover 2 with pliers, which is convenient for classified recycling, achieving two goals at once.

[0035] Specifically, limit blocks 33 are arranged in an array on the outer edge wall of the inner cylinder 3, and positioning grooves 22 are evenly distributed on the inner edge wall of the cover 2 for the limit blocks 33 to be inserted into. When the inner cylinder 3 is installed into the cover 2, the limit blocks 33 are slidably inserted into the positioning grooves 22, which can limit the inner cylinder 3 and the cover 2, preventing the cover 2 and the cover 1 from rotating during screwing, thereby ensuring that the end cap can be tightened normally using the internal thread 31.

[0036] Specifically, the inner cylinder 3 has side grooves 34 located directly above the two limiting blocks 33 on the outer edge wall. When the inner cylinder 3 is pressed into the cover cylinder 2, the side grooves 34 and the corresponding positioning grooves 22 form a clearance opening 01. The clearance opening 01 formed by the positioning grooves 22 and the side grooves 34 can make room for the pliers, making it convenient for the pliers to insert and clamp the inner cylinder 3 for pulling it out and separating.

[0037] Specifically, the cover 1 is provided with a through positive electrode hole 11 and a through negative electrode hole 12, which facilitates electrode connection.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rotary lithium battery cap, characterized in that: it comprises a cover body (1), a cover cylinder (2) and an inner cylinder body (3); the cover cylinder (2) is arranged perpendicularly to the cover body (1), and the cover body (1) and the cover cylinder (2) are integrally formed; the inner cylinder body (3) is matched in size with the inner edge of the cover cylinder (2); an inner thread (31) is formed on the inner wall of the inner cylinder body (3), and the inner cylinder body (3) is press-fitted in the cover cylinder (2).

2. The rotary lithium battery cap according to claim 1, characterized in that: an annular embedding groove (21) is arranged on the inner wall of the cover cylinder (2) near the cover body (1); a bottom skirt (32) is arranged around the axis of the end of the inner cylinder body (3); when the inner cylinder body (3) is press-fitted into the cover cylinder (2), the bottom skirt (32) is correspondingly pressed into the embedding groove (21), thereby achieving clamping.

3. The rotary lithium battery cap according to claim 2, characterized in that: before the inner cylinder body (3) is press-fitted into place, each bottom skirt (32) is in an outwardly inclined state; the bottom skirt (32) is made of aluminum.

4. The rotary lithium battery cap according to claim 1, characterized in that: limiting blocks (33) are arranged on the outer edge wall of the inner cylinder body (3) in an array manner, and the inner edge wall of the cover cylinder (2) is uniformly provided with positioning grooves (22) for corresponding matching insertion of the limiting blocks (33).

5. The rotary lithium battery cap according to claim 4, characterized in that: a side groove (34) is arranged above each of the two limiting blocks (33) on the outer edge wall of the inner cylinder body (3); when the inner cylinder body (3) is press-fitted into the cover cylinder (2), a gap (01) is formed between the two side grooves (34) and the corresponding positioning grooves (22).

6. The rotary lithium battery cap according to claim 1, characterized in that: the cover body (1) is provided with a through positive electrode hole (11) and a through negative electrode hole (12).

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