Positive electrode cover plate of cylindrical battery

Abstract

The utility model relates to an anode cover plate of a cylindrical battery. Relates to the technical field of new energy batteries. The battery cover plate specifically comprises a cover plate main body fixedly connected with a battery shell, lower plastic arranged on the inner side of the cover plate main body, and a connecting piece arranged on the inner side of the lower plastic, a first boss is arranged on the outer side of the connecting piece, and a liquid injection channel is formed in the center of the first boss and penetrates through the connecting piece. The liquid injection hole is formed in the center of the cover plate body, the central axis of the lower plastic and the central axis of the cover plate body are located on the same straight line, the receding hole is formed in the center of the lower plastic, and the first boss penetrates through the receding hole and then is fixedly connected with the cover plate body, so that other positioning procedures are not needed; therefore, the liquid injection channel arranged at the central position of the first boss can be ensured to be coaxial with the liquid injection hole, so that the assembly process of the positive electrode cover plate is simplified, the assembly of the positive electrode cover plate is simple, convenient and easy to implement, and the production efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially, is related to a positive cover plate of cylindrical battery. BACKGROUND

[0002] Lithium ion battery has the advantages of high energy density, long cycle life, high rate performance and safety, and is green and environmental protection, and is an important energy product for modern electronic products and power automobile. Cylindrical battery has become one of the important research directions in the field of power battery due to the advantages of high energy density, high safety and low cost. Generally, the cylindrical battery comprises a battery shell, a roll core, a positive cover plate and a negative cover plate, the roll core is arranged in the shell, the positive cover plate is fixedly arranged at the positive opening end of the battery shell and connected with the positive tab of the roll core, and the negative cover plate is fixedly arranged at the negative opening end of the battery shell and connected with the negative tab of the roll core, so that the positive cover plate is connected with the positive tab of the roll core, the positive electrode of the roll core is led out, the negative cover plate is connected with the negative tab of the roll core, the negative electrode of the roll core is led out, and the charge and discharge performance of the cylindrical battery is realized.

[0003] In the manufacturing process of the cylindrical battery, the positive cover plate is used to close the positive opening end of the battery shell, and the negative cover plate is used to close the negative opening end of the battery shell, and then electrolyte is injected into the battery shell, so that the electrolyte can immerse the roll core in the battery shell, and therefore the injection hole for injecting the electrolyte is arranged on the positive cover plate. In the prior art, the injection hole on the positive cover plate is usually eccentric, and since the positive cover plate is composed of multiple components, the injection hole formed on the multiple components needs to be coaxial, so that the electrolyte can be smoothly injected into the battery shell. When the injection hole is eccentric, the assembly of the multiple components in the positive cover plate needs to be positioned for multiple times, thereby causing difficulty in the assembly of the positive cover plate and reducing the production efficiency. UTILITY MODEL CONTENTS

[0004] The utility model aims at the deficiencies of the prior art, and provides a positive cover plate of cylindrical battery, which overcomes the technical prejudice of the eccentric arrangement of the conventional injection hole, and through the re-innovation design of the structure, the assembly of the positive cover plate is simple and convenient, easy to implement, thereby improving the production efficiency.

[0005] The utility model provides a cylindrical battery's positive cover plate, including with the fixed connection of battery shell's cover plate main part, be located in the lower plastic of cover plate main part inside, and be located in the connecting piece of lower plastic inside, the middle axis of lower plastic with the middle axis of cover plate main part is on the same straight line, the center position of cover plate main part is equipped with the liquid injection hole, the center position of lower plastic is equipped with the avoiding hole, the outside of connecting piece is equipped with the first boss of through avoiding hole with the fixed connection of cover plate main part, the center position of first boss is equipped with the liquid injection channel of communication with liquid injection hole, liquid injection channel is through connecting piece.

[0006] Further, the inner side of the cover plate body is provided with at least two limiting grooves, and the outer side of the lower plastic is provided with at least two limiting columns, and the at least two limiting columns are respectively inserted into the at least two limiting grooves.

[0007] Further, the inner side of the cover plate body is provided with a downward extending liquid injection boss, the first boss is provided with a liquid injection groove, the liquid injection boss is inserted into the liquid injection groove, the liquid injection hole penetrates the liquid injection boss, and the top opening of the liquid injection channel is located at the bottom of the liquid injection groove.

[0008] Further, the inner side of the cover plate body is further provided with a liquid injection column, the liquid injection column extends downward on the liquid injection boss, the cross-sectional area of the liquid injection boss is greater than that of the liquid injection column, the liquid injection hole penetrates the liquid injection column, and the liquid injection column is inserted into the liquid injection channel.

[0009] Further, the inner side of the lower plastic is provided with a mounting groove, the connecting piece is mounted in the mounting groove, and the mounting groove is used for limiting the connecting piece.

[0010] Further, the connecting piece includes a main piece and a bending part, the main piece and the bending part are of an integral structure, the first boss is located on the outer side of the main piece, and the bending part is bent on the inner side of the main piece to connect the positive tab of the core.

[0011] Further, the bending part includes a first bending piece bent on the inner side of the main piece, and a second bending piece bent on the inner side of the first bending piece, the liquid injection channel includes a first through hole provided on the main piece, a second through hole provided on the first bending piece, and a third through hole provided on the second bending piece, and the first through hole, the second through hole and the third through hole are coaxial.

[0012] Further, the connecting piece further comprises a first notch portion arranged at the junction of the main body piece and the first bending piece, and a second notch portion arranged at the junction of the first bending piece and the second bending piece, the first notch portion being used for bending the first bending piece inwardly of the main body piece, and the second notch portion being used for bending the second bending piece inwardly of the first bending piece.

[0013] Further, the inner side of the second bending piece is provided with a second boss, which is matched with the positive electrode tab of the core, and is used for fixedly connecting with the positive electrode tab of the core.

[0014] Further, the lower plastic is provided with a plurality of round holes, which are used for dispersing electrolyte.

[0015] The positive cover plate of the cylindrical battery has the following beneficial effects:

[0016] (1) The liquid injection hole of the positive cover plate is arranged at the center position of the cover plate body, the central axis of the lower plastic and the central axis of the cover plate body are on the same straight line, the lower plastic is provided with an avoiding hole at the center position, the first boss penetrates through the avoiding hole and is fixedly connected with the cover plate body, thus, without other positioning procedures, the liquid injection channel arranged at the center position of the first boss can be coaxial with the liquid injection hole, thereby simplifying the assembly procedure of the positive cover plate, making the assembly of the positive cover plate simple and convenient, easy to implement, and further improving the production efficiency.

[0017] (2) The inner side of the cover plate body of the positive cover plate is provided with at least two limiting grooves, and the outer side of the lower plastic is provided with at least two limiting columns, the at least two limiting columns are respectively inserted and matched with the at least two limiting grooves, which not only can further ensure that the central axis of the lower plastic and the central axis of the cover plate body are on the same straight line, but also can enhance the stability of the installation of the lower plastic on the inner side of the cover plate body.

[0018] (3) The cover plate body of the positive cover plate is provided with a liquid injection boss, and the first boss is provided with a liquid injection groove, the liquid injection boss and the liquid injection groove are inserted and matched, on the one hand, the liquid injection channel and the liquid injection hole can be coaxially arranged, thereby simplifying the assembly procedure of the positive cover plate; on the other hand, the stability of the fixed connection of the connecting piece and the cover plate body can be enhanced, thereby enhancing the stability of the structure of the positive cover plate and protecting the performance of the cylindrical battery.

[0019] (4) The inner side of the cover plate body of the positive cover plate is further provided with a liquid injection column, the liquid injection column extends downward on the liquid injection boss, when the liquid injection boss is inserted into the liquid injection groove, the liquid injection column is inserted into the liquid injection channel, thereby under the guidance of the liquid injection boss and the liquid injection column, the electrolyte can flow into the liquid injection channel more smoothly, and the liquid injection efficiency of the cylindrical battery is improved.

[0020] (5) The bending part of the positive electrode cover plate comprises a first bending piece and a second bending piece, the first bending piece is bent on the inner side of the main piece, and the second bending piece is bent on the inner side of the first bending piece, the interval between the second connecting piece and the main piece is increased through the first bending piece, so that the operator can easily operate the fixing connection between the positive electrode tab of the winding core and the bending part, the assembly of the positive electrode cover plate is more simple and convenient, and the production efficiency is improved;

[0021] (6) A plurality of round holes are arranged on the lower plastic of the positive electrode cover plate, and the plurality of round holes are uniformly distributed on the lower plastic, on the one hand, the weight of the lower plastic can be reduced, so that the weight of the positive electrode cover plate is reduced, and the cylindrical battery is more lightweight; on the other hand, when the liquid level height of the electrolyte increases to the position of the lower plastic, the electrolyte is dispersed through the plurality of round holes, so that the electrolyte can better immerse the winding core. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment of the present application and, together with the description, serve to explain the principles of the present application. In these drawings, like reference numerals are used to represent similar elements.

[0023] Figure 1 An assembly explosion view of the positive electrode cover plate of the cylindrical battery according to the embodiment of the present application;

[0024] Figure 2 A sectional view of the positive electrode cover plate of the cylindrical battery according to the embodiment of the present application;

[0025] Figure 3 A structure view of the cover plate main body of the positive electrode cover plate of the cylindrical battery according to the embodiment of the present application;

[0026] Figure 4 A structure view of the lower plastic of the positive electrode cover plate of the cylindrical battery according to the embodiment of the present application;

[0027] Figure 5 A structure view of the positive electrode cover plate of the cylindrical battery according to the embodiment of the present application after the bending of the connecting piece;

[0028] Figure 6 A structure view of the positive electrode cover plate of the cylindrical battery according to the embodiment of the present application before the bending of the connecting piece.

[0029] In the figure: 1, cover plate main body; 11, liquid injection hole; 12, limiting groove; 13, liquid injection boss; 14, liquid injection column; 2, lower plastic; 21, avoiding hole; 22, limiting column; 23, mounting groove; 24, round hole; 3, connecting sheet; 30, first boss; 301, liquid injection groove; 31, liquid injection channel; 32, main sheet; 321, first through hole; 33, first bending sheet; 331, second through hole; 34, second bending sheet; 341, third through hole; 342, second boss; 35, first gap part; 36, second gap part. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment, and all other embodiments obtained by the person skilled in the art without creative labor based on the embodiments in the utility model belong to the protection scope of the utility model.

[0031] Please refer to Figures 1-6 The utility model embodiment relates to a positive electrode cover plate of a cylindrical battery, which comprises a cover plate main body 1 fixedly connected with a battery shell, a lower plastic 2 arranged on the inner side of the cover plate main body 1, and a connecting sheet 3 arranged on the inner side of the lower plastic 2; the central axis of the lower plastic 2 is on the same straight line as the central axis of the cover plate main body 1, the center of the cover plate main body 1 is provided with a liquid injection hole 11, the center of the lower plastic 2 is provided with an avoiding hole 21, the outer side of the connecting sheet 3 is provided with a first boss 30 penetrating through the avoiding hole 21 and fixedly connected with the cover plate main body 1, the center of the first boss 30 is provided with a liquid injection channel 31 communicating with the liquid injection hole 11, and the liquid injection channel 31 penetrates through the connecting sheet 3.

[0032] In the application, the positive electrode cover plate comprises the cover plate main body 1, the lower plastic 2 and the connecting sheet 3, the cover plate main body 1 is fixedly connected with the battery shell, so as to close the positive electrode open end of the battery shell through the cover plate main body 1. The lower plastic 2 is arranged on the inner side of the cover plate main body 1, and the connecting sheet 3 is arranged on the inner side of the lower plastic 2. The cover plate main body 1 is provided with a liquid injection hole 11 for liquid injection, and the liquid injection hole 11 is arranged at the center of the cover plate main body 1. The lower plastic 2 is provided with an avoiding hole 21, the avoiding hole 21 is arranged at the center of the lower plastic 2, and is coaxial with the liquid injection hole 11.

[0033] The outer side of the connecting piece 3 is provided with a first boss 30, when the connecting piece 3 is installed at the inner side of the lower plastic 2, the first boss 30 penetrates the avoiding hole 21 and contacts with the cover plate body 1, so that the connecting piece 3 and the cover plate body 1 are in conduction by fixing and connecting the first boss 30 and the cover plate body 1, then the inner side of the connecting piece 3 is fixedly connected with the positive electrode lug of the winding core, the connecting piece 3 and the positive electrode lug of the winding core are in conduction, and then the cover plate body 1 and the positive electrode lug of the winding core are in conduction through the connecting piece 3, so that the cover plate body 1 leads out the positive electrode of the winding core, and the charging and discharging performance of the cylindrical battery is realized.

[0034] The connecting piece 3 is provided with a liquid injection channel 31, when the first boss 30 at the outer side of the connecting piece 3 penetrates the avoiding hole 21 and is fixedly connected with the cover plate body 1, the liquid injection channel 31 is in communication with the liquid injection hole 11, so that the electrolyte injected from the liquid injection hole 11 flows to the liquid injection channel 31, and the electrolyte flowing through the liquid injection channel 31 can enter the battery shell, and then the injection of the electrolyte of the cylindrical battery is completed.

[0035] In the present application, the liquid injection hole 11 is arranged at the center position of the cover plate body 1, and when the lower plastic 2 is installed at the inner side of the cover plate body 1, the central axis is on the same straight line as the central axis of the cover plate body 1, so that the avoiding hole 21 arranged at the center line position of the lower plastic 2 is coaxial with the liquid injection hole 11.

[0036] When the connecting piece 3 is installed at the inner side of the cover plate body 1, the first boss 30 at the outer side of the connecting piece 3 is fixedly connected with the cover plate body 1 after penetrating the avoiding hole 21, so that the liquid injection channel 31 arranged at the center position of the first boss 30 is coaxial with the avoiding hole 21 and the liquid injection hole 11, and thus the coaxial arrangement of the liquid injection channel 31 and the liquid injection hole 11 can be realized without other positioning processes, thereby simplifying the assembly process of the positive electrode cover plate, making the assembly of the positive electrode cover plate simple and convenient, easy to implement, and further improving the production efficiency.

[0037] Specifically, in actual implementation, the first boss 30 can be fixedly connected with the cover plate body 1 by welding or the like. In the cylindrical battery, since the positive electrode cover plate is used to close the positive electrode opening end of the battery shell, in the present application, the "outer side" and "inner side" are the side close to the battery shell as the inner side and the side away from the battery shell as the outer side when the positive electrode cover plate is fixedly connected with the battery shell, and the "outer side" and "inner side" mentioned below are based on this.

[0038] In the embodiment, the inner side of the cover plate body 1 is provided with at least two limiting grooves 12, and the outer side of the lower plastic 2 is provided with at least two limiting columns 22. When the lower plastic 2 is installed on the inner side of the cover plate body 1, the at least two limiting columns 22 on the outer side of the lower plastic 2 are respectively inserted into the at least two limiting grooves 12 on the inner side of the cover plate body 1.

[0039] By the insertion and cooperation of the at least two limiting columns 22 and the at least two limiting grooves 12, on the one hand, the central axis of the lower plastic 2 is ensured to be on the same straight line as the central axis of the cover plate body 1, so that when the first boss 30 on the outer side of the connecting piece 3 penetrates through the avoiding hole 21 and is fixedly connected with the cover plate body 1, no other positioning process is needed, and the liquid injection channel 31 arranged at the center of the first boss 30 can be coaxial with the liquid injection hole 11, thereby simplifying the assembly process of the positive electrode cover plate, making the assembly of the positive electrode cover plate simple and convenient, easy to implement, and further improving the production efficiency; on the other hand, the stability of the installation of the lower plastic 2 on the inner side of the cover plate body 1 can be enhanced, thereby enhancing the stability of the structure of the positive electrode cover plate and protecting the performance of the cylindrical battery.

[0040] In the embodiment, the cover plate body 1 is provided with a liquid injection boss 13, and the liquid injection boss 13 vertically extends downward on the inner side of the cover plate body 1. The first boss 30 is provided with a liquid injection groove 301, and the liquid injection groove 301 vertically extends downward on the top of the first boss 30. Therefore, when the first boss 30 penetrates through the avoiding hole 21 and contacts the cover plate body 1, the liquid injection boss 13 is inserted into the liquid injection groove 301.

[0041] When the liquid injection hole 11 is arranged at the center of the cover plate body 1 and extends to the liquid injection boss 13, and the top opening of the liquid injection channel 31 is arranged at the bottom of the liquid injection groove 301, the liquid injection channel 31 is in communication with the liquid injection hole 11, so that the electrolyte injected by the liquid injection hole 11 can enter the battery shell through the liquid injection channel 31, thereby completing the injection of the electrolyte of the cylindrical battery.

[0042] It can be predicted that the liquid injection boss 13 arranged on the inner side of the cover plate body 1 has a central axis on the same straight line as the central axis of the cover plate body 1, the liquid injection groove 301 arranged on the top of the first boss 30 has a central axis on the same straight line as the central axis of the first boss 30, the liquid injection hole 11 is located at the center of the liquid injection boss 13, and the liquid injection channel 31 is located at the center of the liquid injection groove 301.

[0043] By the insertion and cooperation of the liquid injection boss 13 and the liquid injection groove 301, on the one hand, the liquid injection channel 31 can be further ensured to be coaxially arranged with the liquid injection hole 11, thereby simplifying the assembly process of the positive electrode cover plate, making the assembly of the positive electrode cover plate simple and convenient, easy to implement, and further improving the production efficiency; on the other hand, the stability of the fixed connection of the connecting piece 3 and the cover plate body 1 can be enhanced, thereby enhancing the stability of the structure of the positive electrode cover plate and protecting the performance of the cylindrical battery.

[0044] Further, in the embodiment, the inner side of the cover plate body 1 is further provided with a liquid injection column 14, the liquid injection column 14 extends downward on the liquid injection boss 13, and the cross-sectional area of the liquid injection boss 13 is greater than that of the liquid injection column 14, so that the liquid injection boss 13 and the liquid injection column 14 form a stepped structure. When the first boss 30 penetrates the avoiding hole 21 and contacts the cover plate body 1, the liquid injection boss 13 is inserted into the liquid injection groove 301, and since the liquid injection channel 31 is located at the center position of the liquid injection groove 301, and the top opening of the liquid injection channel 31 is provided at the bottom of the liquid injection groove 301, the liquid injection column 14 is inserted into the liquid injection channel 31 through the top opening of the liquid injection channel 31.

[0045] The liquid injection hole 11 penetrates the liquid injection column 14, so that the electrolyte injected through the liquid injection hole 11 flows into the liquid injection channel 31 after sequentially flowing through the liquid injection boss 13 and the liquid injection column 14, so that the electrolyte flows more smoothly into the liquid injection channel 31 under the guidance of the liquid injection boss 13 and the liquid injection column 14, and then enters the battery shell through the liquid injection channel 31, preventing the electrolyte from spreading in all directions, thereby improving the liquid injection efficiency of the cylindrical battery. At the same time, the insertion and cooperation of the liquid injection column 14 and the liquid injection channel 31 make the fixed connection between the connecting piece 3 and the cover plate body 1 more stable, thereby enhancing the stability of the positive electrode cover plate structure and ensuring the performance of the cylindrical battery.

[0046] In the embodiment, the inner side of the lower plastic 2 is provided with a mounting groove 23, and when the connecting piece 3 is mounted on the inner side of the lower plastic 2, the connecting piece 3 is inserted into the mounting groove 23, so that the connecting piece 3 is limited by the mounting groove 23, making the connecting piece 3 more stable when mounted on the lower plastic 2, and further making the overall structure of the cover plate body 1, the lower plastic 2 and the connecting piece 3 more stable, thereby enhancing the stability of the positive electrode cover plate structure and ensuring the performance of the cylindrical battery.

[0047] In the embodiment, the connecting piece 3 includes a main piece 32 and a bending part, and initially, the bending part extends in the horizontal direction on one side of the main piece 32, and the bending part and the main piece 32 are in an integrated structure, thereby enhancing the stability of the structure of the connecting piece 3. The first boss 30 is arranged on the outer side of the main piece 32, and when the positive electrode cover plate is assembled, the first boss 30 on the outer side of the main piece 32 penetrates the lower plastic 2 first, and is fixedly connected with the cover plate body 1, thereby realizing the fixed connection between the connecting piece 3 and the cover plate body 1.

[0048] The positive electrode tab of the winding core is fixedly connected with the bending part, and finally the bending part is bent by 180°, so that the bending part is bent on the inner side of the main body sheet 32, thereby realizing the fixed connection of the positive electrode tab of the winding core on the inner side of the connecting sheet 3. The connecting sheet 3 connects the cover plate main body 1 and the positive electrode tab of the winding core, and further realizes the conduction of the cover plate main body 1 and the positive electrode of the winding core, so that the cover plate main body 1 leads out the positive electrode of the winding core, and realizes the charge and discharge performance of the cylindrical battery.

[0049] Further, in the present embodiment, the bending part comprises a first bending sheet 33 and a second bending sheet 34. Initially, the first bending sheet 33 extends in the horizontal direction on one side of the main body sheet 32, and the second bending sheet 34 extends in the horizontal direction on one side of the first bending sheet 33. The main body sheet 32, the first bending sheet 33 and the second bending sheet 34 are in an integral structure. When assembling the positive electrode cover plate, the first boss 30 on the outer side of the main body sheet 32 is first penetrated through the lower plastic 2, and then fixedly connected with the cover plate main body 1, thereby realizing the fixed connection of the connecting sheet 3 and the cover plate main body 1.

[0050] The positive electrode tab of the winding core is fixedly connected with the second bending sheet 34, and then the first bending sheet 33 is bent by 180°, so that the first bending sheet 33 is bent on the inner side of the main body sheet 32. Finally, the second bending sheet 34 is bent by 180°, so that the second bending sheet 34 is bent on the inner side of the first bending sheet 33, thereby realizing the fixed connection of the positive electrode tab of the winding core on the inner side of the connecting sheet 3. Further, the cover plate main body 1 and the positive electrode of the winding core are conducted through the main body sheet 32, the first bending sheet 33 and the second bending sheet 34.

[0051] In the present application, since the fixed connection of the positive electrode tab of the winding core and the bending part is performed before the bending of the bending part, the bending part is provided with the first bending sheet 33 and the second bending sheet 34, so that the positive electrode tab of the winding core is fixedly connected with the outer side of the second bending sheet 34. The first bending sheet 33 can increase the distance between the second connecting sheet 3 and the main body sheet 32, thereby facilitating the operation of the staff to fixedly connect the positive electrode tab of the winding core and the bending part, preventing the fixed connection of the positive electrode tab of the winding core and the bending part from interfering with the fixed connection of the main body sheet 32 on the cover plate main body 1, and further making the assembly of the positive electrode cover plate more simple and convenient, and improving the production efficiency.

[0052] In the present application, the liquid injection channel 31 comprises a first through hole 321 arranged on the main body sheet 32, a second through hole 331 arranged on the first bending sheet 33, and a third through hole 341 arranged on the second bending sheet 34. When the first bending sheet 33 is bent on the inner side of the main body sheet 32, and the second bending sheet 34 is bent on the inner side of the first bending sheet 33, the first through hole 321, the second through hole 331 and the third through hole 341 are coaxial, thereby forming a complete liquid injection channel 31 on the connecting sheet 3. When the liquid injection column 14 is inserted into the first through hole 321, the electrolyte injected through the liquid injection hole 11 can flow through the first through hole 321, the second through hole 331 and the third through hole 341 in turn, and then enter the battery shell, ensuring smooth injection of the electrolyte.

[0053] In the present embodiment, a first notch portion 35 is arranged at the junction of the main body sheet 32 and the first bending sheet 33, and a second notch portion 36 is arranged at the junction of the first bending sheet 33 and the second bending sheet 34. At the first notch portion 35, the first bending sheet 33 is bent by 180°, so that the first bending sheet 33 is bent on the inner side of the main body sheet 32, thereby making the bending operation of the first bending sheet 33 easier to implement through the first notch portion 35.

[0054] At the second notch portion 36, the second bending sheet 34 is bent by 180°, so that the second bending sheet 34 is bent on the inner side of the first bending sheet 33, thereby making the bending operation of the second bending sheet 34 easier to implement through the second notch portion 36, and further making the assembly of the positive cover plate simpler and more convenient, and improving the production efficiency.

[0055] In the present embodiment, the inner side of the second bending sheet 34 is provided with a second boss 342. When the positive tab of the winding core is fixedly connected with the second bending sheet 34, the positive tab of the winding core is first attached to the second boss 342, and then the positive tab of the winding core is fixed on the second boss 342 by welding or the like, thereby making the fixed connection of the positive tab of the winding core with the second bending sheet 34 easier to implement, and further making the assembly of the positive cover plate simpler and more convenient, and improving the production efficiency.

[0056] After the fixed connection of the positive tab of the winding core with the second bending sheet 34 is completed, the second bending sheet 34 is bent by 180°, so that the second bending sheet 34 is bent on the inner side of the first bending sheet 33. At this time, the second boss 342 and the positive tab of the winding core fixed on the second boss 342 are both located on the inner side of the first bending sheet 33, thereby realizing the fixed connection of the positive tab of the winding core with the inner side of the connecting sheet 3, and further realizing the connection of the cover plate main body 1 and the positive tab of the winding core through the connecting sheet 3, and realizing the conduction of the cover plate main body 1 and the positive tab of the winding core.

[0057] In the embodiment, the lower plastic 2 is provided with a plurality of circular holes 24, which are uniformly distributed on the lower plastic 2. On the one hand, the weight of the lower plastic 2 can be reduced, so that the weight of the positive cover plate is reduced, and the cylindrical battery is more lightweight. On the other hand, after the battery shell is filled with electrolyte, the liquid level of the electrolyte is increased to the position of the lower plastic 2, so that the electrolyte can flow through the plurality of circular holes 24 on the lower plastic 2, thereby dispersing the electrolyte through the plurality of circular holes 24, so that the electrolyte can better immerse the winding core.

[0058] The above-described content can be implemented individually or in various combinations, and these variations are within the protection scope of the present application.

[0059] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0060] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A positive cover plate of a cylindrical battery, comprising a cover plate body (1) fixedly connected with a battery shell, a lower plastic (2) arranged on the inner side of the cover plate body (1), and a connecting piece (3) arranged on the inner side of the lower plastic (2), characterized in that: The middle axis of the lower plastic (2) is on the same straight line with the middle axis of the cover plate body (1), the center position of the cover plate body (1) is provided with a liquid injection hole (11), the center position of the lower plastic (2) is provided with an avoiding hole (21), the outer side of the connecting sheet (3) is provided with a first boss (30) penetrating through the avoiding hole (21) and fixedly connected with the cover plate body (1), the center position of the first boss (30) is provided with a liquid injection channel (31) communicating with the liquid injection hole (11), and the liquid injection channel (31) penetrates through the connecting sheet (3).

2. A positive cover plate for a cylindrical battery as defined in claim 1, characterized in that: The inner side of the cover plate body (1) is provided with at least two limiting grooves (12), and the outer side of the lower plastic (2) is provided with at least two limiting columns (22), and the at least two limiting columns (22) are respectively inserted into the at least two limiting grooves (12).

3. A positive cover plate for a cylindrical battery as defined in claim 1, characterized in that: The inner side of the cover plate body (1) is provided with a downwardly extending liquid injection boss (13), the first boss (30) is provided with a liquid injection groove (301), the liquid injection boss (13) is inserted into the liquid injection groove (301), the liquid injection hole (11) penetrates through the liquid injection boss (13), and the top opening of the liquid injection channel (31) is located at the bottom of the liquid injection groove (301).

4. A positive cover plate for a cylindrical battery as defined in claim 3, characterized in that: The inner side of the cover plate body (1) is further provided with a liquid injection column (14), the liquid injection column (14) extends downwardly on the liquid injection boss (13), the cross-sectional area of the liquid injection boss (13) is greater than that of the liquid injection column (14), the liquid injection hole (11) penetrates through the liquid injection column (14), and the liquid injection column (14) is inserted into the liquid injection channel (31).

5. A positive cover plate for a cylindrical battery as defined in claim 1, characterized in that: The inner side of the lower plastic (2) is provided with a mounting groove (23), the connecting sheet (3) is mounted in the mounting groove (23), and the mounting groove (23) is used for limiting the connecting sheet (3).

6. A positive cover plate for a cylindrical battery as defined in claim 1, characterized in that: The connecting sheet (3) comprises a main sheet (32) and a bending part, the main sheet (32) and the bending part are in an integral structure, the first boss (30) is arranged on the outer side of the main sheet (32), and the bending part is bent on the inner side of the main sheet (32) and used for connecting the positive electrode tab of the winding core.

7. A positive cover plate for a cylindrical battery as defined in claim 6, characterized in that: The bending part comprises a first bending sheet (33) bent on the inner side of the main sheet (32) and a second bending sheet (34) bent on the inner side of the first bending sheet (33), the liquid injection channel (31) comprises a first through hole (321) arranged on the main sheet (32), a second through hole (331) arranged on the first bending sheet (33) and a third through hole (341) arranged on the second bending sheet (34), and the first through hole (321), the second through hole (331) and the third through hole (341) are coaxial.

8. A positive cover plate for a cylindrical battery as defined in claim 7, characterized in that: The connecting piece (3) further comprises a first notch portion (35) arranged at the joint of the main body piece (32) and the first bending piece (33), and a second notch portion (36) arranged at the joint of the first bending piece (33) and the second bending piece (34), the first notch portion (35) is used to bend the first bending piece (33) in the inner side of the main body piece (32), and the second notch portion (36) is used to bend the second bending piece (34) in the inner side of the first bending piece (33).

9. A positive cover plate for a cylindrical battery as defined in claim 7, characterized in that: The inner side of the second bending piece (34) is provided with a second boss (342), which is matched with the positive lug of the core, and is used to be fixedly connected with the positive lug of the core.

10. A positive cover plate for a cylindrical battery as defined in claim 1, characterized in that: A plurality of round holes (24) are arranged on the lower plastic (2), and the plurality of round holes (24) are used to disperse the electrolyte.

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