Electrode cap structure and battery

Abstract

The utility model provides an electrode cap structure and a battery. The electrode cap structure comprises a cap body, the protruding part is located at the end of the cap body and protrudes out of the end face of the cap body, and a gap is formed between the protruding part and the end face of the cap body; the insulating part covers the end part of the cap body, the insulating part is provided with an extension arm, and the extension arm is positioned in the gap and prevents the insulating part from being separated from the end surface of the cap body. The utility model solves the problem that the insulating surface pad is easy to fall off in the processing process of the cylindrical lithium ion battery in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to an electrode cover cap structure and a battery. BACKGROUND

[0002] In a common cylindrical lithium ion battery, in order to prevent the short circuit between the steel shell and the positive cover cap caused by the conductor introduced from the external environment, an insulating face pad is placed on the surface of the cover cap of the cylindrical battery cell to avoid short circuit. At present, in the production stage, the insulating face pad has the following problems: in the manufacturing process of the cylindrical battery cell, the punched insulating face pad is usually placed on the positive cover cap before the battery cell is sleeved with a sleeve, and after the heat shrink sleeve is sleeved, the heat shrink sleeve is shrunk by high temperature. With the shrinkage of the size of the heat shrink sleeve, the sleeve will cover the positive terminal and the negative terminal. During the covering of the positive terminal, the insulating face pad is fixed on the cover cap above the sleeve. However, due to the different shrinkage speeds and heat shrinkage amounts of the positive terminal in all directions of the circumference during the shrinkage of the sleeve, the insulating face pad will be unevenly stressed at all positions of the outer circumference, which will cause the insulating face pad to fall off during the heat shrinkage process, thereby seriously affecting the production efficiency. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide an electrode cover cap structure and a battery to solve the problem that the insulating face pad is easy to fall off in the processing of the cylindrical lithium ion battery in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an electrode cover cap structure is provided, comprising: a cover cap body; a protruding part, the protruding part is located at the end of the cover cap body and protrudes from the end face of the cover cap body, and a gap is formed between the protruding part and the end face of the cover cap body; and an insulating part, the insulating part is covered on the end of the cover cap body, and the insulating part has an extending arm, the extending arm is located in the gap and prevents the insulating part from separating from the end face of the cover cap body.

[0005] SPECIFICATION PN285925HZYWLN

[0006] Further, the insulating part has a ring structure, when the insulating part is covered on the end of the cover cap body, the protruding part is located at the inner circle of the ring structure, and the extending arm is located at the inner circle of the ring structure.

[0007] Further, the extending arm is a plurality of extending arms, and each extending arm is sequentially and spacedly arranged along the circumference of the inner circle of the ring structure.

[0008] Further, the protruding part has a connecting part between the protruding part and the cover cap body, the protruding part is connected with the cover cap body through the connecting part, there are a plurality of extending arms, and a containing area is formed between any two adjacent extending arms, and when the extending arm is located in the gap, the connecting part is located in the containing area.

[0009] Further, the end of the extending arm has a stop portion, the stop portion is connected with the extending arm by bending, and the stop portion extends to the inside of the accommodating area.

[0010] Further, the extending arms are arranged in pairs, the accommodating area is formed between the two extending arms of the same pair, and the stop portions on the two extending arms of the same pair extend towards each other by bending.

[0011] Further, the connecting portions are arranged in plurality, each connecting portion is arranged at intervals along the circumference of the protruding portion, an entrance of the gap is formed between the connecting portions along the circumference of the protruding portion, and the extending arm extends into the gap through the entrance.

[0012] Further, the accommodating areas are arranged in plurality, and the number of the accommodating areas is not less than the number of the connecting portions, and each connecting portion is located in the accommodating area.

[0013] Further, along the circumference of the protruding portion, the corresponding central angle on the two sides of the connecting portion is 30-60 degrees, and the corresponding central angle on the two sides of the entrance of the gap is 60-90 degrees.

[0014] According to another aspect of the present application, a battery is provided, comprising the electrode cap structure described above.

[0015] By arranging the extending arm on the insulating piece according to the technical solution of the present application, when the insulating piece is installed on the surface of the cap body, the extending arm can extend into the gap formed by the protruding portion and the end face of the cap body, so that the extending arm and the side of the gap cooperate to block the falling of the insulating piece, increase the resistance of the insulating piece when falling, and effectively prevent the insulating piece from falling during production, thereby improving the production efficiency of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part of the present application, and are used to provide a further understanding of the present application, the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 The structure schematic diagram of the end of the electrode cap structure of the present application is shown;

[0018] Figure 2 The bottom view of Figure 1 is shown;

[0019] Figure 3 The front view of Figure 1 is shown;

[0020] Figure 4 The structure schematic diagram of the cap body and the protruding portion is shown;

[0021] Figure 5 a front view of Figure 4 the cap structure is shown.

[0022] Figure 6 a structure diagram of the insulating piece is shown.

[0023] Among them, the above-mentioned drawings include the following reference signs:

[0024] 10, cap body; 11, connecting part; 20, protruding part; 30, insulating piece; 31, extending arm; 32, stop part. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] Description PN285925 HZYWLN

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0028] In the present application, unless otherwise specified, the orientation words such as "up, down, top, bottom" are generally directed to the direction shown in the drawings, or are directed to the vertical, perpendicular or gravity direction of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0029] In order to solve the problem that the insulating surface pad is easy to fall off in the processing of the cylindrical lithium ion battery in the prior art, the present application provides an electrode cap structure and a battery.

[0030] As shown in Figures 1 to 6 a kind of electrode cap structure, including: cap body 10, protruding part 20 and insulating piece 30, protruding part 20 is located at the end of cap body 10, and protrudes from the end surface of cap body 10, gap is formed between protruding part 20 and the end surface of cap body 10;Insulating piece 30 covers the end of cap body 10, and insulating piece 30 has extending arm 31, extending arm 31 is located in the gap, and prevents insulating piece 30 from separating from the end surface of cap body 10.

[0031] The embodiment sets the protruding arm 31 on the insulating piece 30, when the insulating piece 30 is installed on the surface of the cap body 10, the protruding arm 31 can extend into the gap formed by the protruding part 20 and the end surface of the cap body 10, so that the protruding arm 31 and the gap side surface cooperate to block the falling of the insulating piece 30, increase the resistance of the insulating piece 30 when falling, thereby effectively preventing the insulating piece 30 from falling during production, and improving the production efficiency of the battery cell.

[0032] It should be noted that the end portion of the cap body 10 is only shown in the drawings of the embodiment, and this portion is simplified as a ring-shaped sheet to facilitate the cooperation relationship. The other structures of the cap body 10 will not be described in detail.

[0033] As shown in Figure 4 and Figure 5 In the embodiment, the cap body 10 is used to connect the positive electrode inside the battery and the external circuit as the basis of the entire structure. The end of the cap body 10 is designed as a circular plane, and the center of the circular plane is formed with a protruding part 20 axially outward. In this way, the shape design can cooperate with the positive electrode of the battery cell to ensure stable electrical contact and mechanical assembly. At the same time, the protruding part 20 and the cap body 10 naturally form a gap, which can be used as an exhaust passage to meet the processing requirements. The insulating piece 30 is a non-conductive component, which is provided on the end of the cap body 10 to prevent external conductors from contacting the cap body 10 and causing short circuit. The insulating piece 30 is also designed with a protruding arm 31, which will be inserted into the gap formed by the protruding part 20 and the cap body 10 during installation, thereby physically fixing the insulating piece 30 and increasing its stability to prevent it from falling during subsequent heat shrink wrapping or use. On the one hand, the electrode cap structure solves the problem of easy falling of the insulating surface pad during production or use of the cylindrical battery cell, and improves the production efficiency. On the one hand, it improves the safety of the battery and avoids short circuit failure of the end of the cap body 10 and external conductors.

[0034] As shown in Figure 1 and Figure 2As shown, the insulating piece 30 in the embodiment adopts an insulating surface pad, and the insulating piece 30 is in a ring structure. The ring structure is configured to allow the insulating piece 30 to avoid the protruding part 20, that is, when the insulating piece 30 is installed on the end surface of the cap body 10, the protruding part 20 can be accommodated in the inner ring of the ring structure, and the insulating piece 30 can be attached to the outer end surface of the cap body 10, so that the insulating piece 30 and the cap body 10 are better matched. Meanwhile, the protruding arm 31 is arranged at the inner ring of the ring structure, and the protruding arm 31 extends to the center of the ring structure, so that when the insulating piece 30 is installed, the protruding part 20 extends into the inner ring of the ring structure, and the protruding arm 31 naturally extends into the gap from the opening of the gap. In this way, the form of the ring structure also provides conditions for the cooperation between the protruding arm 31 and the gap, and ensures that the required cooperation can be completed at one time without excessive additional operations, which is convenient and fast.

[0035] Of course, the specific structure of the insulating piece 30 is not limited to the above-mentioned arrangement mode of the embodiment, and the specific structure of the insulating piece 30 can be adjusted accordingly according to the form of the protruding part 20.

[0036] Description PN285925 HZYWLN

[0037] Optionally, the number of protruding arms 31 can be set as required, and one or more can be set. In the embodiment, the protruding arms 31 are multiple, and the multiple protruding arms 31 can extend into the gap, thereby increasing the resistance when the insulating piece 30 falls off, and ensuring that the insulating piece 30 is stable and reliable after installation. Meanwhile, since the insulating piece 30 adopts a ring structure, the protruding arms 31 are arranged along the circumference of the inner ring of the ring structure in the embodiment, and further, the protruding arms 31 are arranged along the circumference of the ring structure at equal intervals. In this way, the contact area between the protruding arms 31 and the protruding part 20 is increased, the risk of falling off caused by uneven stress at a single point is reduced, and the resistance of the protruding arm 31 to the insulating piece 30 is uniform in the circumferential direction, so that the insulating piece 30 is uniformly stressed in the circumferential direction of 360 degrees. Therefore, the insulating piece 30 can not only avoid falling off as a whole, but also avoid falling off as a single segment in the circumferential direction, thereby ensuring the stability of the insulating piece 30.

[0038] In the embodiment, the connecting portion 11 is arranged at the edge of the protruding portion 20, on the one hand, the connecting portion 11 can connect the protruding portion 20 and the cap body 10, on the other hand, the connecting portion 11 blocks part of the circumferential opening of the gap, so that the opening of the gap is divided into several entrances. At the same time, the two adjacent extending arms 31 are arranged circumferentially and spaced apart, so that an accommodation area is formed between the two extending arms 31. When the extending arm 31 is located in the gap, the connecting portion 11 is located in the accommodation area. Therefore, the position of the extending arm 31 corresponds to the position of the connecting portion 11, and the extending arm 31 is arranged on both sides of the connecting portion 11 in the circumferential direction. Due to the cooperation of the connecting portion 11, the extending arm 31 is more difficult to be pulled out, thereby further improving the resistance of the insulating piece 30 to be pulled out, and ensuring the stability of the insulating piece 30.

[0039] Optionally, the connecting portion 11 is one or more. In the embodiment, a plurality of connecting portions 11 are arranged, and the connecting portions 11 are arranged circumferentially and spaced apart along the protruding portion 20. In the embodiment, three connecting portions 11 are arranged, and the three connecting portions 11 are distributed equidistantly along the circumferential direction of the protruding portion 20. Therefore, along the axial direction of the insulating cap, the three connecting portions 11 form a sector, and the three connecting portions 11 are located on the same circular track line. Along the circumferential direction of the protruding portion 20, the connecting portions 11 form three entrances of the gap, and the extending arm 31 can be respectively inserted into the gap through the three entrances.

[0040] Correspondingly, as shown in Figure 2 and Figure 6 , the extending arms 31 of the embodiment are arranged in pairs, and two extending arms 31 form a pair. There are three pairs of extending arms 31, and the three pairs of extending arms 31 are arranged circumferentially and spaced apart by 120 degrees. An accommodation area is formed between the two extending arms 31 in the same pair, thereby forming a plurality of accommodation areas. The extending arms 31 and the connecting portions 11 are correspondingly arranged, each connecting portion 11 can be accommodated in an accommodation area, and the extending arm 31 can uniformly bear the force from both sides, thereby reducing the risk of deformation or falling of the insulating piece 30 caused by uneven force on one side, and improving the anti-falling effect.

[0041] Of course, the specific number and arrangement of the connecting portion 11 and the insulating piece 30 can be adjusted as needed. In the embodiment, the number of accommodation areas is not less than the number of connecting portions 11, so that each connecting portion 11 can be located in an accommodation area, forming a one-to-one positioning and clamping and protection relationship, and each extending arm 31 can cooperate with the connecting portion 11, thereby further ensuring the assembly stability of the insulating piece 30.

[0042] In order to further improve the cooperation between the extension arm 31 and the connecting portion 11, the end of the extension arm 31 is provided with a stop portion 32, which is connected to the extension arm 31 by bending and extends to the inside of the accommodation area. Based on the aforementioned paired arrangement of the extension arm 31, the stop portion 32 on the two extension arms 31 of the same pair is bent to extend in the direction of approaching each other. In this way, the extension arm 31 and the stop portion 32 form a substantially L-shaped structure. Since the direction in which the extension arm 31 escapes from the gap is substantially along the radial direction of the protruding portion 20, and the direction of the stop abutment between the stop portion 32 and the connecting portion 11 is exactly along the radial direction of the protruding portion 20, the abutment cooperation between the stop portion 32 and the inner wall of the connecting portion 11 further hinders the occurrence of the extension arm 31 escaping from the gap, thereby further ensuring that the extension arm 31 can be stably retained in the gap, and further ensuring that the insulating piece 30 is retained on the cap body 10. The arrangement of the aforementioned stop portion 32 enhances the fixing effect in a specific direction, which can effectively prevent the insulating piece 30 from moving in the radial or axial direction of the end of the cap body 10 when subjected to vibration, impact or thermal expansion and contraction effect, and ensure the stability and safety of the insulating piece 30.

[0043] Description PN285925 HZYWLN

[0044] It should be noted that the shape of the stop portion 32 is not limited to the aforementioned L-shaped structure of the embodiment, but can also be C-shaped, U-shaped or other shapes with stop function, depending on the shape of the cap body 10, the protruding portion 20 and the material properties of the insulating piece 30, etc. In addition, the extension direction, length of the stop portion 32 and the bending angle with the extension arm 31 can be adjusted according to actual needs to adapt to different sizes and types of battery cells. In addition, it is also possible to consider using a high polymer material with better elasticity or strength to improve its stability and wear resistance in high temperature environment.

[0045] Since the extension arm 31 of the embodiment is multiple, the stop portion 32 is also provided with multiple, which is preferably arranged one by one between the extension arm 31, that is, the end of each extension arm 31 is provided with a stop portion 32 by bending, so that each extension arm 31 and the stop portion 32 can cooperate with the connecting portion 11, greatly improving the anti-falling effect. The cooperation between the multiple extension arms 31, the stop portion 32 and the connecting portion 11 of the embodiment forms a multi-point support, which increases the fixing stability of the insulating piece 30 on the cap body 10, effectively prevents the insulating piece 30 from moving in the radial or axial direction of the end of the cap body 10, and ensures that the insulating piece 30 can be stably maintained in place even when the battery cell is subjected to vibration or temperature change during use, thereby reducing the probability of falling off and ensuring the safety of the battery cell.

[0046] The insulating piece 30 of the embodiment is a flexible component such as rubber, which can be deformed by itself, so that the extending arm 31 and the stop portion 32 can be deformed and inserted into the gap by force exerted by a person during installation.

[0047] In the embodiment, the central angles corresponding to the two sides of the connecting portion 11 along the circumference of the protruding portion 20 are 30-60 degrees. The design of the central angles directly affects the strength and stability of the connecting portion 11 and its flexibility during assembly. A smaller central angle, for example, close to 30 degrees, can provide a more secure connecting portion 11 structure and enhance the connection strength between the protruding portion 20 and the cap body, but it may increase the difficulty of fitting. A larger central angle, for example, close to 60 degrees, can provide better assembly guidance and reduce stress concentration during assembly, but the structural strength of the connecting portion 11 may be relatively weakened. Therefore, the embodiment does not make specific limitations, and the degree of the central angle corresponding to the two sides of the connecting portion 11 can be considered between 30-60 degrees according to actual conditions. Similarly, the central angles corresponding to the two sides of the entrance of the gap are 60-90 degrees, that is, the central angle of the entrance of the gap is designed to match the central angle of the two sides of the connecting portion 11. On the one hand, a larger central angle, for example, 60 degrees ≦ central angle ≦ 90 degrees, provides a wider entrance, which facilitates the smooth insertion of the extending arm 31 of the insulating piece 30 into the gap during assembly, reduces assembly resistance, and on the other hand, ensures that the extending arm 31 and the stop portion 32 can maintain stable contact with the connecting portion 11 during heat shrinkage, preventing the insulating piece 30 from falling off. Selecting a central angle range of 60-90 degrees can take into account the assembly convenience and adaptability during heat shrinkage, improving the overall performance of the battery and production efficiency. Further preferably, the central angle corresponding to the two sides of the connecting portion 11 in the embodiment is 45 degrees, and the central angle corresponding to the two sides of the entrance of the gap is 75 degrees.

[0048] In another aspect, the embodiment provides a battery comprising the above-mentioned electrode cap structure. Such a battery, due to the use of the above-mentioned electrode cap structure, not only improves the assembly efficiency and reduces the production cost during production, but also effectively avoids the risk of short circuit caused by the loosening or falling off of the insulating piece 30 during use, improving the safety and reliability of the battery.

[0049] It should be noted that the plurality in the above-mentioned embodiments means at least two.

[0050] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0051] 1. The problem of easy falling off of the insulating face pad during the processing of the cylindrical lithium ion battery in the prior art is solved.

[0052] 2. It increases the resistance encountered by the insulation components when they fall off, thereby effectively preventing the insulation components from falling off during production and improving the production efficiency of the battery cells;

[0053] 3. Increased the contact area between the extendable arm and the protrusion, reducing the risk of detachment that may be caused by uneven force at a single point;

[0054] Instruction manual PN285925HZYWLN

[0055] 4. The resistance of the extended arm to the insulating component is uniform in the circumference, so that the insulating component is subjected to uniform force in 360 degrees around the circumference. This ensures that the insulating component can not only be prevented from falling off as a whole, but also that each segment in the circumference can be prevented from falling off individually, thus ensuring the stability of the insulating component.

[0056] 5. The abutting fit between the stop and the inner wall of the connecting part further prevents the extension arm from coming out of the gap, thereby ensuring that the extension arm can be stably kept within the gap, and thus ensuring that the insulating part is kept on the cap body.

[0057] Obviously, the embodiments described above are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort should fall within the scope of protection of this application.

[0058] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0059] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0060] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrode cap structure, characterized by, The utility model relates to an electrode cap structure, comprising: a cap body (10); a protrusion (20) located at the end of the cap body (10) and protruding from the end face of the cap body (10), the gap being formed between the protrusion (20) and the end face of the cap body (10); an insulation piece (30) covering the end of the cap body (10), the insulation piece (30) having an extending arm (31) located in the gap and preventing the insulation piece (30) from being separated from the end face of the cap body (10).

2. The electrode cap structure of claim 1, wherein The insulation piece (30) has a ring structure, when the insulation piece (30) covers the end of the cap body (10), the protrusion (20) is located at the inner ring of the ring structure, and the extending arm (31) is located at the inner ring of the ring structure.

3. The electrode cap structure of claim 2, wherein The extending arm (31) is in plurality, and each extending arm (31) is sequentially and spacedly arranged along the circumference of the inner ring of the ring structure.

4. The electrode cap structure according to claim 1 or 2, characterized by The protrusion (20) and the cap body (10) have a connecting part (11), the protrusion (20) and the cap body (10) are connected through the connecting part (11), the extending arm (31) is in plurality, and an accommodation area is formed between adjacent two extending arms (31), when the extending arm (31) is located in the gap, the connecting part (11) is located in the accommodation area.

5. The electrode cap structure of claim 4, wherein The end of the extending arm (31) has a stop part (32), the stop part (32) is connected to the extending arm (31) by bending, and the stop part (32) extends to the inside of the accommodation area.

6. The electrode cap structure of claim 5, wherein The extending arm (31) is arranged in pairs, the accommodation area is formed between two extending arms (31) of the same pair, and the stop parts (32) on the two extending arms (31) of the same pair extend by bending in the direction of approaching each other.

7. The electrode cap structure of claim 4, wherein The connecting part (11) is in plurality, each connecting part (11) is spacedly arranged along the circumference of the protrusion (20), and the entrance of the gap is formed between the connecting parts (11) along the circumference of the protrusion (20), the extending arm (31) extends into the gap from the entrance.

8. The electrode cap structure of claim 7, wherein The accommodation area is in plurality, and the number of the accommodation areas is not less than the number of the connecting parts (11), and each connecting part (11) is located in the accommodation area.

9. The electrode cap structure of claim 7, wherein Along the circumference of the protrusion (20), the corresponding central angle on both sides of the connecting part (11) is 30-60 degrees, and the corresponding central angle on both sides of the entrance of the gap is 60-90 degrees.

10. A battery, characterized by The utility model relates to an electrode cap structure, comprising: the electrode cap structure according to any one of claims 1 to 9.

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