Battery cap and lithium battery comprising same

Abstract

The utility model discloses a battery cap and a lithium battery comprising the same. The battery cap comprises a sealing rubber ring provided with an accommodating cavity; the anti-explosion aluminum sheet is arranged in the containing cavity, the anti-explosion aluminum sheet is provided with a first side face and a second side face which are opposite to each other, the first side face is provided with a limiting flange, and a clamping groove is formed between the first side face and the limiting flange; the periphery of the cap body is clamped in the clamping groove; the CID element is connected to the second side surface; the accommodating cavity is provided with an outer end part relatively close to the limiting flange, and the outer end part is provided with an opening; when the outer end part is not bent towards the first side surface, the opening is gradually enlarged outwards along the Y-axis direction; when the outer end portion is bent towards the first side face to abut against the explosion-proof aluminum sheet, the side wall of the opening abuts against the limiting flange. The shape of the opening is convenient for guiding and installing the explosion-proof aluminum sheet, the cap body and the CID element at correct positions in the accommodating cavity, and the sealing connection between the side wall of the opening and the limiting flange can be easier, fit and stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery safety technical field especially relates to battery cap and including the lithium battery of battery cap. BACKGROUND

[0002] With the continuous development of lithium battery technology, its application in the field of portable electronic equipment, electric vehicles and energy storage systems is increasingly widespread. However, lithium batteries may face risks such as overheating, short circuit, overcharge during use. Once these risks occur, not only the battery itself may be damaged, but also the surrounding environment and personnel safety may be threatened. Therefore, improving the safety of lithium batteries has become the focus of the industry.

[0003] Traditional battery caps usually include sealing rubber ring, explosion-proof aluminum sheet, cap body and CID (current interrupt device) elements and other key components. These components need to be accurately placed in their respective positions during assembly to ensure the sealing and explosion-proof performance of the battery cap. However, in actual operation, due to insufficient cooperation between components or unreasonable design, it often leads to low assembly efficiency, and even improper assembly, thereby affecting the overall quality of the battery. Especially in the installation process of the explosion-proof aluminum sheet and the cap body, the traditional design often lacks effective guiding and fixing mechanism, which makes it difficult for the explosion-proof aluminum sheet to be accurately and stably placed in the accommodating cavity of the sealing rubber ring. This not only increases the difficulty of assembly, but also may cause the explosion-proof aluminum sheet to loosen or fall off during battery use, thereby endangering the safety of the battery.

[0004] In addition, the traditional battery cap also has certain deficiencies in sealing. Due to the large cooperation gap between components, or the unreasonable selection and design of sealing materials, it often leads to poor sealing effect of the battery cap, making the electrolyte and other harmful substances inside the battery easily leak out, causing harm to the environment and human health. SUMMARY

[0005] In order to overcome at least one of the defects of the prior art described above, the utility model provides a battery cap and a lithium battery comprising the battery cap, aiming to make the battery cap easier and more accurate to complete the placement and fixation of components during assembly, while ensuring that the battery cap has excellent sealing and explosion-proof performance.

[0006] The technical scheme adopted by the utility model to solve the problem is:

[0007] The utility model provides a battery cap, it includes: sealing rubber ring is provided with accommodating cavity, explosion -proof aluminum sheet is arranged in the accommodating cavity, the explosion -proof aluminum sheet has opposite first side and second side, the first side is provided with the limiting flange, the first side and the limiting flange form the clamping groove, cap body, the periphery of cap body is clamped in the clamping groove, CID element is connected to the second side, wherein the accommodating cavity has the outer end portion opposite to the limiting flange, the outer end portion is provided with the opening, when the outer end portion is not bent to the first side, the opening gradually increases along the Y -axis direction and goes outward, when the outer end portion is bent to the first side and presses the explosion -proof aluminum sheet, the sidewall of opening abuts on the limiting flange.

[0008] According to some embodiments of the utility model, the inner side wall of the accommodating cavity is provided with a limiting wall extending in the radial direction, and the second side is connected to the limiting wall.

[0009] According to some embodiments of the utility model, when the outer end portion is not bent to the first side, the limiting wall is provided with a second ring protrusion, the second ring protrusion is in contact with the second side; when the outer end portion is bent to the first side and presses the explosion -proof aluminum sheet, the second ring protrusion and the second side form a sealed pressing.

[0010] According to some embodiments of the utility model, the limiting wall divides the accommodating cavity into a first mounting hole and a second mounting hole, the limiting wall is provided with a communication hole communicating the first mounting hole and the second mounting hole, the cap body is located in the first mounting hole, the CID element is located in the second mounting hole, the first side is provided with a cutting groove, and the limiting wall can block the CID element from moving from the second mounting hole to the first mounting hole.

[0011] According to some embodiments of the utility model, the limiting wall is integrally formed on the inner side wall of the accommodating cavity.

[0012] According to some embodiments of the utility model, the explosion -proof aluminum sheet is provided with a recessed portion recessed from the first side to the second side, the recessed portion is located in the second mounting hole, the CID element and the recessed portion are connected, and the cutting groove is arranged around the periphery of the recessed portion.

[0013] According to some embodiments of the utility model, the diameter of the cutting groove is less than the diameter of the communication hole.

[0014] According to some embodiments of the utility model, the side of the cap body towards the first side is provided with a limiting cavity.

[0015] According to some embodiments of the utility model, when the outer end portion is not bent to the first side surface, the inner side wall of the accommodating cavity is provided with a first annular convex, and the first annular convex is adjacent to the opening; when the outer end portion is bent to the first side surface, the first annular convex is used for sealing and pressing against the limiting flange.

[0016] In addition, the utility model also provides a lithium battery, including the battery cap as described above.

[0017] In conclusion, the battery cap and the lithium battery comprising the same have at least the following technical effects:

[0018] On the one hand, when the outer end portion is not bent to the first side surface, the opening gradually increases outward along the Y-axis direction, which provides a natural guide path for the installer, so that each component can be placed more easily and accurately in the correct position in the accommodating cavity, which not only improves the assembly efficiency, but also reduces the quality problems caused by improper assembly; on the other hand, when the outer end portion is bent to the first side surface to press against the explosion-proof aluminum sheet, the shape of the opening makes the sealing connection between the side wall of the opening and the limiting flange easier, fitter and more stable. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of the lithium battery (not sealed) of the utility model embodiment;

[0020] Figure 2 It is a cross-sectional structure schematic view of the lithium battery (not sealed) of the utility model embodiment;

[0021] Figure 3 It is a structure schematic view of the battery cap (not sealed) of the utility model embodiment;

[0022] Figure 4 It is an explosion structure schematic view of the battery cap (not sealed) of the utility model embodiment;

[0023] Figure 5 It is a cross-sectional structure schematic view of the battery cap (not sealed) of the utility model embodiment;

[0024] Figure 6 It is a structure schematic view of the battery cap (sealed) of the utility model embodiment;

[0025] Figure 7 It is a cross-sectional structure schematic view of the battery cap (sealed) of the utility model embodiment.

[0026] Among them, the meaning of the reference signs is as follows:

[0027] 1, seal rubber ring, 11, containing cavity, 111, outer end, 112, opening, 113, limiting wall, 114, first ring convex, 115, second ring convex, 116, first mounting hole, 117, second mounting hole, 118, communication hole, 2, explosion-proof aluminum sheet, 21, first side, 211, cutting groove, 22, second side, 23, limiting flange, 24, clamping groove, 25, recess, 3, cap body, 31, limiting cavity, 32, exhaust hole, 4, CID element, 41, air hole, 5, shell. DETAILED DESCRIPTION

[0028] In order to better understand and implement, the technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model.

[0029] In the description of the utility model, it needs to be explained that the directions or position relations indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are the directions or position relations shown based on the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0031] The utility model will be further described in detail below in combination with the drawings.

[0032] Please refer to Figures 1 to 7 The embodiment discloses a battery cap, which comprises a seal rubber ring 1, an explosion-proof aluminum sheet 2, a cap body 3 and a CID element 4; the seal rubber ring 1 is provided with a containing cavity 11; the explosion-proof aluminum sheet 2 is arranged in the containing cavity 11, the explosion-proof aluminum sheet 2 has opposite first side 21 and second side 22, the first side 21 is provided with a limiting flange 23, and the first side 21 and the limiting flange 23 form a clamping groove 24; the cap body 3 is clamped on the clamping groove 24; the CID element 4 is connected to the second side 22; wherein the containing cavity 11 has an outer end 111 close to the limiting flange 23, and the outer end 111 is provided with an opening 112; when the outer end 111 is not bent to the first side 21, the opening 112 gradually increases outward along the Y-axis direction; when the outer end 111 is bent to the first side 21 to press the explosion-proof aluminum sheet 2, the side wall of the opening 112 abuts against the limiting flange 23. Specifically, please refer to Figure 5In the coordinate system, the Y-axis direction is the axis direction of the cap body 3, and the X-axis direction is perpendicular to the Y-axis direction. The size of the opening 112 in the X-axis direction gradually increases outward along the Y-axis direction. When the opening 112 is circular, the inner diameter of the opening 112 in the X-axis direction gradually increases outward along the Y-axis direction.

[0033] It should be noted that the CID element 4 of the lithium battery is a Current Interrupt Device, which is an important safety protection device inside the lithium battery. The main function of the CID element 4 is to cut off the current through the internal mechanism when the battery cell fails (such as overheating, short circuit, overcharge, etc.), thereby preventing the battery from further damage or danger, which is a conventional technical means known to those skilled in the art and will not be described here.

[0034] The embodiment also provides a lithium battery comprising the battery cap described above, further comprising a shell 5. After the battery cap is welded into the end of the shell 5, the shell 5 needs to be flanged, and then the flange of the shell 5 and the battery cap are pressed and sealed to fix the shell 5 and the battery cap. It can be understood that when the above sealing is performed, the outer end 111 of the accommodating cavity 11 is bent towards the first side surface 21 to press the explosion-proof aluminum sheet 2, and the side wall of the opening 112 abuts against the limiting flange 23.

[0035] The battery cap provided by the embodiment has the following advantages. On the one hand, when the outer end 111 is not bent towards the first side surface 21, the shape of the opening 112 facilitates guiding and installing the explosion-proof aluminum sheet 2, the cap body 3 and the CID element 4 into the correct position in the accommodating cavity 11. On the other hand, when the outer end 111 is bent towards the first side surface 21 to press the explosion-proof aluminum sheet 2, the shape of the opening 112 makes the sealing connection between the side wall of the opening 112 and the limiting flange 23 easier, fitter and more stable.

[0036] As shown in Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , and preferably, in the embodiment, when the outer end 111 is not bent towards the first side surface 21, the inner side wall of the accommodating cavity 11 is provided with a first annular protrusion 114 adjacent to the opening 112. When the sealing is performed, that is, when the outer end 111 is bent towards the first side surface 21, the first annular protrusion 114 is used to be sealed and pressed against the limiting flange 23, so as to improve the sealing performance between the outer end 111 and the limiting flange 23.

[0037] As shown in Figure 4 and Figure 5As shown, preferably, in the present embodiment, the inner side wall of the accommodating cavity 11 is provided with a radially extending limiting wall 113, and the second side surface 22 is connected to the limiting wall 113, which can effectively support the explosion-proof aluminum sheet 2 and prevent it from unnecessary movement or deformation inside the battery, such stable support not only helps to maintain the flatness and functionality of the explosion-proof aluminum sheet 2, but also improves the stability and durability of the entire battery cap structure; the limiting wall 113 can provide positioning effect for the installation of the explosion-proof aluminum sheet 2, and when installing the explosion-proof aluminum sheet 2, the limiting wall 113 can serve as a clear reference point or boundary, so that the explosion-proof aluminum sheet 2 can be accurately and quickly placed in the correct position, such positioning effect not only simplifies the installation process, but also reduces the error rate caused by improper installation, improves production efficiency and product quality.

[0038] More preferably, in the present embodiment, in order to simplify the overall structure and improve the overall structural strength, the limiting wall 113 is integrally formed with the inner side wall of the accommodating cavity 11, the integrally formed design means that the limiting wall 113 and the inner side wall of the accommodating cavity 11 are formed at the same time in the manufacturing process, without the need for additional assembly steps, which not only reduces the number of parts, but also simplifies the production process flow and reduces production costs, at the same time, due to the reduction of connection points and potential assembly errors, the compactness and consistency of the overall structure are also improved; the integrally formed design also enhances the connection strength between the limiting wall 113 and the inner side wall of the accommodating cavity 11. Since they are manufactured as a whole, there is no structural weakness caused by loose connection. Such enhanced connection strength makes the entire battery cap more stable and reliable when subjected to internal pressure, external impact or vibration, and is not prone to deformation or damage.

[0039] As shown in Figure 4 , Figure 5 , Figure 6 and Figure 7 , more preferably, in the present embodiment, when the outer end portion 111 is not bent towards the first side surface 21, the limiting wall 113 is provided with a second ring protrusion 115, which is in contact with the second side surface 22; when the outer end portion 111 is bent towards the first side surface 21 to press against the explosion-proof aluminum sheet 2, the second ring protrusion 115 and the second side surface 22 form a sealing pressure, so as to improve the sealing performance between the limiting wall 113 and the second side surface 22.

[0040] As shown in Figure 4 and Figure 5As shown, specifically, in the present embodiment, the limiting wall 113 divides the accommodating cavity 11 into a first mounting hole 116 and a second mounting hole 117, the limiting wall 113 is provided with a communication hole 118 which communicates the first mounting hole 116 and the second mounting hole 117, the cap body 3 is located in the first mounting hole 116, the CID element 4 is located in the second mounting hole 117, and the CID element 4 is provided with a vent hole 41; preferably, the first side surface 21 is provided with a ring-shaped cutting groove 211, and the limiting wall 113 can block the CID element 4 from moving from the second mounting hole 117 to the first mounting hole 116; in this way, when a short circuit occurs in the battery or other reasons cause a large amount of gas to be generated in the battery, thereby causing the pressure to increase sharply, the gas enters the space between the explosion-proof aluminum sheet 2 and the CID element 4 through the vent hole 41 of the CID element 4, and the pressure on the explosion-proof aluminum sheet 2, when the pressure rises to a certain extent, the cutting groove 211 deforms, the opening of the cutting groove 211 becomes larger, and the strength of the explosion-proof aluminum sheet 2 at the cutting groove 211 decreases, when the pressure continues to rise to a certain extent, the cutting groove 211 is torn, and the internal pressure is released instantaneously, thereby avoiding the explosion of the battery, the cap body 3 can prevent the fragments of the explosion-proof aluminum sheet 2 from bouncing outwards, and the limiting wall 113 can prevent the CID element 4 from moving from the second mounting hole 117 to the first mounting hole 116.

[0041] As shown in Figure 5 and Figure 7 , preferably, in the present embodiment, the explosion-proof aluminum sheet 2 is provided with a recessed portion 25 which is recessed from the first side surface 21 to the second side surface 22, the recessed portion 25 is located in the second mounting hole 117, the CID element 4 is connected with the recessed portion 25, and specifically, the CID element 4 is welded to the recessed portion 25, and the cutting groove 211 is arranged around the periphery of the recessed portion 25, the arrangement of the recessed portion 25 can make the deformation of the explosion-proof aluminum sheet 2 mainly concentrate at the cutting groove 211, which is beneficial to tearing the explosion-proof aluminum sheet 2 at the cutting groove 211 when the pressure rises to a certain extent, thereby achieving smooth pressure relief.

[0042] As shown in Figure 5 and Figure 7 , preferably, in the present embodiment, the diameter of the cutting groove 211 is smaller than the diameter of the communication hole 118, which is beneficial to tearing the explosion-proof aluminum sheet 2 at the cutting groove 211 when the pressure rises to a certain extent, thereby achieving smooth pressure relief.

[0043] As shown in Figure 5 and Figure 7 , preferably, in the present embodiment, the cap body 3 is provided with a limiting cavity 31 on the side facing the first side surface 21, and the arrangement of the limiting cavity 31 can provide space for the turning of the fragments of the explosion-proof aluminum sheet 2.

[0044] As shown in Figure 3 , Figure 4 and Figure 6As shown, preferably, in the present embodiment, a plurality of exhaust holes 32 are formed in the cap body 3, and preferably, in the present embodiment, the number of exhaust holes 32 is preferably three, which ensures the timely release of the internal air pressure of the battery cell after the explosion of the explosion-proof aluminum sheet 2, avoiding the problem of battery cell explosion caused by the ineffective release of air pressure.

[0045] Preferably, in the present embodiment, the sealing rubber ring 1 is made of PBT material, and the cap body 3 is made of SPCC material.

[0046] In summary, the battery cap and the lithium battery comprising the same disclosed by the present application can at least bring the following beneficial technical effects:

[0047] 1) The opening 112 gradually increases along the Y-axis direction, which provides a natural guide path for the installer, so that each component can be more easily and accurately placed in the correct position in the receiving cavity, which not only improves the assembly efficiency, but also reduces the quality problems caused by improper assembly;

[0048] 2) The shape of the opening 112 can make the sealing connection between the side wall of the opening 112 and the limiting flange 23 more easily, closely and stably;

[0049] 3) The limiting wall 113 can effectively support the explosion-proof aluminum sheet 2, preventing unnecessary movement or deformation of the explosion-proof aluminum sheet 2 inside the battery, which not only helps to maintain the flatness and functionality of the explosion-proof aluminum sheet 2, but also improves the stability and durability of the entire battery cap structure;

[0050] 4) The limiting wall 113 is integrally formed on the inner side wall of the receiving cavity 11, without the need for additional assembly steps, which not only reduces the number of parts, but also simplifies the production process, reduces production costs, and at the same time, due to the reduction of connection points and potential assembly errors, the compactness and consistency of the overall structure are also improved.

[0051] The technical means disclosed by the present application scheme is not limited to the technical means disclosed by the above-mentioned embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered within the scope of protection of the present application.

Claims

1. A battery cap, characterized in that, include: A sealing ring (1) is provided with a receiving cavity (11); An explosion-proof aluminum sheet (2) is disposed in the receiving cavity (11). The explosion-proof aluminum sheet (2) has a first side (21) and a second side (22) facing away from each other. The first side (21) is provided with a limiting flange (23). A snap-fit ​​groove (24) is formed between the first side (21) and the limiting flange (23). The cap body (3) is engaged with the snap-fit ​​groove (24) around its periphery; CID element (4) is connected to the second side (22); The receiving cavity (11) has an outer end (111) that is relatively close to the limiting flange (23), and the outer end (111) is provided with an opening (112); when the outer end (111) is not bent toward the first side (21), the opening (112) gradually increases outward along the Y-axis direction; when the outer end (111) is bent toward the first side (21) to press against the explosion-proof aluminum sheet (2), the sidewall of the opening (112) abuts against the limiting flange (23).

2. The battery cap according to claim 1, characterized in that, The inner wall of the receiving cavity (11) is provided with a limiting wall (113) extending radially, and the second side (22) is connected to the limiting wall (113).

3. The battery cap according to claim 2, characterized in that, When the outer end (111) is not bent toward the first side (21), the limiting wall (113) is provided with a second annular protrusion (115), which contacts the second side (22); when the outer end (111) is bent toward the first side (21) to press against the explosion-proof aluminum sheet (2), the second annular protrusion (115) and the second side (22) form a sealing and pressing action.

4. The battery cap according to claim 2, characterized in that, The limiting wall (113) divides the receiving cavity (11) into a first mounting hole (116) and a second mounting hole (117). The limiting wall (113) is provided with a connecting hole (118) connecting the first mounting hole (116) and the second mounting hole (117). The cap body (3) is located in the first mounting hole (116), and the CID element (4) is located in the second mounting hole (117). The first side (21) is provided with a groove (211). The limiting wall (113) can prevent the CID element (4) from moving from the second mounting hole (117) to the first mounting hole (116).

5. The battery cap according to claim 4, characterized in that, The limiting wall (113) is integrally formed on the inner side wall of the receiving cavity (11).

6. The battery cap according to claim 4, characterized in that, The explosion-proof aluminum sheet (2) is provided with a recessed portion (25) that is recessed from the first side (21) to the second side (22). The recessed portion (25) is located in the second mounting hole (117). The CID element (4) is connected to the recessed portion (25). The groove (211) is provided around the periphery of the recessed portion (25).

7. The battery cap according to claim 6, characterized in that, The diameter of the groove (211) is smaller than the diameter of the connecting hole (118).

8. The battery cap according to any one of claims 4-7, characterized in that, The cap body (3) has a limiting cavity (31) on the side facing the first side (21).

9. The battery cap according to any one of claims 1-7, characterized in that, When the outer end (111) is not bent toward the first side (21), the inner wall of the receiving cavity (11) is provided with a first annular protrusion (114), which is adjacent to the opening (112); when the outer end (111) is bent toward the first side (21), the first annular protrusion (114) is used to seal and press against the limiting flange (23).

10. A lithium battery, characterized in that, Includes the battery cap as described in any one of claims 1-9.

Images