CN217062311U - Cover plate assembly for lithium ion battery, lithium ion battery and vehicle - Google Patents
Cover plate assembly for lithium ion battery, lithium ion battery and vehicle Download PDFInfo
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- CN217062311U CN217062311U CN202220922769.9U CN202220922769U CN217062311U CN 217062311 U CN217062311 U CN 217062311U CN 202220922769 U CN202220922769 U CN 202220922769U CN 217062311 U CN217062311 U CN 217062311U
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Abstract
The utility model relates to a battery technology field specifically provides a apron subassembly, lithium ion battery and vehicle for lithium ion battery, aims at solving the problem that current lithium ion battery space utilization is low. For this purpose, the cover plate component of the utility model comprises a cover plate body, a positive pole, a positive connecting sheet and a negative connecting sheet, wherein the positive pole is arranged on the cover plate body, and the positive pole is connected with a positive pole ear of the lithium ion battery through the positive connecting sheet; the negative pole connection piece sets up in the below of apron body, and the negative pole connection piece is connected with lithium ion battery's negative pole utmost point ear, and the apron body passes through lithium ion battery's casing and is connected with the negative pole connection piece, realizes leading out with one side of lithium ion battery's positive pole ear and negative pole utmost point ear's electric current, has promoted lithium ion battery's assembly space utilization, has reduced lithium ion battery's positive pole utmost point ear and negative pole utmost point ear's overall height, has further promoted the holistic space utilization of lithium ion battery.
Description
Technical Field
The utility model relates to a battery technology field specifically provides a apron subassembly, lithium ion battery and vehicle for lithium ion battery.
Background
The lithium ion battery has the advantages of high energy density, good power performance, long cycle life and the like, and is popularized and applied more and more widely in the field of new energy automobiles in recent years. However, among the various lithium ion battery structure types, the cylindrical lithium ion battery has an important position in the new energy market due to the comprehensive advantages of good safety performance, high production efficiency and low cost. With the technical upgrade of cylindrical lithium batteries for vehicles, development is gradually progressing from small cylindrical lithium ion batteries such as 18650 and 21700 to large cylindrical lithium ion battery series such as 4680 and 4690 which have larger volume and higher energy density.
At present, a positive pole column and a negative pole column of a cylindrical lithium ion battery are positioned at two ends of a shell, the negative pole column is generally welded with the shell of the cylindrical lithium ion battery, and the positive pole column is welded with a positive current collector. However, the positive electrode pole and the negative electrode pole are located at two ends of the shell, so that the cylindrical lithium ion battery is large in external size and low in space utilization rate.
Therefore, there is a need in the art for a new cover plate assembly for a lithium ion battery, a lithium ion battery and a vehicle to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving above-mentioned technical problem, promptly, solve the problem that current lithium ion battery space utilization is low.
In a first aspect, the present invention provides a cover plate assembly for a lithium ion battery, the cover plate assembly comprising a cover plate body, a positive pole, a positive connecting sheet and a negative connecting sheet, the positive pole is disposed on the cover plate body, and the positive pole is connected to a positive pole tab of the lithium ion battery through the positive connecting sheet; the negative electrode connecting piece is arranged below the cover plate body and connected with a negative electrode lug of the lithium ion battery, and the cover plate body is connected with the negative electrode connecting piece through a shell of the lithium ion battery.
In a preferred technical solution of the above cover plate assembly, the negative electrode connecting plate includes a first connecting portion and a second connecting portion disposed on the first connecting portion, the first connecting portion is connected to the negative electrode tab, and the second connecting portion is connected to the housing.
In a preferred technical solution of the above cover plate assembly, the second connecting portion is a first flange structure formed at an edge of the first connecting portion, and the first flange structure is welded to an inner wall of the housing.
In a preferred technical solution of the above cover plate assembly, the positive electrode pole includes a transverse portion and a vertical portion extending perpendicularly from the transverse portion; the cover plate comprises a cover plate body and is characterized in that a through hole is formed in the cover plate body, the connecting end of the vertical portion penetrates through the through hole and is connected with the positive connecting sheet, a first insulating part is arranged between the cover plate body and the positive connecting sheet as well as between the cover plate body and the vertical portion, and a second insulating part is arranged between the transverse portion and the cover plate body.
In a preferred technical solution of the cover plate assembly, the first insulating part includes an insulating ring and a second flanging structure extending outward from a lower edge of the insulating ring, the insulating ring is disposed in the through hole and sleeved on the vertical portion, and the second flanging structure is located between an inner surface of the cover plate body and the positive connecting piece.
In a preferred technical solution of the above cover plate assembly, the second insulating member includes a sealing ring, the sealing ring is sleeved on the vertical portion, and the sealing ring is used for insulating and sealing a gap between the outer surface of the cover plate body and the transverse portion.
In a preferred technical scheme of the cover plate assembly, the cover plate body is further provided with a liquid injection hole, and the liquid injection hole is used for injecting electrolyte into the shell.
In a preferred technical solution of the cover plate assembly, the positive electrode tab includes a plurality of positive electrode lugs, and the positive electrode lugs are distributed in a fan shape; and/or the negative electrode tab comprises a plurality of negative electrode ear parts which are distributed in a fan shape.
In a second aspect, the present invention provides a lithium ion battery comprising the cover plate assembly according to any one of the above preferred embodiments.
In a third aspect, the invention provides a vehicle comprising a cover plate assembly or a lithium ion battery according to any of the above preferred embodiments.
In the preferred technical scheme of the cover plate component of the utility model, the cover plate component comprises a cover plate body, a positive pole, a positive connecting sheet and a negative connecting sheet, the positive pole is arranged on the cover plate body, and the positive pole is connected with a positive pole ear of a lithium ion battery through the positive connecting sheet; the negative electrode connecting piece is arranged below the cover plate body, the negative electrode connecting piece is connected with a negative electrode lug of the lithium ion battery, and the cover plate body is connected with the negative electrode connecting piece through a shell of the lithium ion battery.
For the technical scheme at the both ends that among the prior art anodal utmost point post and negative pole utmost point post are located the casing, the utility model discloses with anodal utmost point post setting on lapping the body, anodal utmost point post passes through the anodal connection piece and is connected with lithium ion battery's anodal utmost point ear, the negative pole connection piece is connected with lithium ion battery's negative pole utmost point ear, and the casing that laps the body and pass through lithium ion battery is connected with the negative pole connection piece, anodal utmost point ear carries out the water conservancy diversion through the anodal utmost point post of lapping body one side promptly, negative pole utmost point ear welds the water conservancy diversion with shells inner wall, thereby realize that anodal ear and the same one side of negative pole utmost point ear's of lithium ion battery's electric current are drawn forth, lithium ion battery's assembly space utilization has been promoted. And the design of the anode tab and the cathode tab is arranged on the same side of the lithium ion battery, so that the total height of the anode tab and the cathode tab of the lithium ion battery is reduced, and the overall space utilization rate of the lithium ion battery is further improved.
In addition, the cathode can be directly connected with a cathode tab through the shell or the cover plate body, the cathode tab does not need to be arranged, and the structure of the lithium ion battery is simplified, so that the using amount of metal materials of the lithium ion battery is reduced, and the purposes of reducing weight and saving cost are achieved.
Furthermore, the negative electrode connecting piece comprises a first connecting part and a second connecting part arranged on the first connecting part, the first connecting part is connected with the negative electrode lug in a welding manner, the second connecting part is connected with the shell in a welding manner, so that the shell can be connected with the negative electrode lug and electrons can be conducted, the cover plate body is connected with the shell in a welding manner, so that the cover plate body can be connected with the shell and electrons can be conducted, and the current of the negative electrode lug can be led out through the shell or the cover plate body; the welding process is adopted, so that the negative connecting sheet is conveniently connected and fixed with the shell and the negative pole lug, the manufacturing difficulty is reduced, and the shell is ensured to be capable of conducting electrons with the negative pole lug.
Furthermore, the second connecting portion is a first flanging structure formed at the edge of the first connecting portion, and the first flanging structure is welded to the inner wall of the shell, so that the negative connecting piece is more firmly connected with the shell.
Further, the positive electrode post comprises a transverse part and a vertical part vertically extending from the transverse part; the cover plate body is provided with a through hole, the connecting end of the vertical part penetrates through the through hole and is connected with the positive connecting sheet, and a first insulating part is arranged between the cover plate body and the positive connecting sheet as well as between the cover plate body and the vertical part, so that the cover plate body is prevented from being connected with the positive connecting sheet and conducting electrons, and the cover plate body is prevented from being connected with the vertical part and conducting electrons, so that the vertical part can only be connected with the positive connecting sheet and conduct electrons; and moreover, the second insulating part is arranged between the transverse part and the cover plate body, so that the transverse part is prevented from being connected with the cover plate body and conducting electrons, the transverse part can be connected with the positive connecting sheet only through the vertical part and conducting electrons, the positive pole column can be connected with the positive connecting sheet only and conducting electrons through the structure, the mutual interference between the positive pole and the negative pole is avoided, and the performance of the lithium ion battery is improved.
Furthermore, the first insulating part comprises an insulating ring and a second flanging structure extending outwards from the lower edge of the insulating ring, the insulating ring is arranged in the through hole and sleeved on the vertical part, so that dust is prevented from falling into the shell, the cover plate body is prevented from being connected with the vertical part and conducting electrons, and the vertical part can only be connected with the positive connecting sheet and conduct electrons; the second flanging structure is located between the inner surface of the cover plate body and the positive connecting piece, so that the cover plate body is prevented from being connected with the positive connecting piece and conducting electrons, and the positive connecting piece can only be connected with the positive pole column and conduct electrons.
Furthermore, the second insulating part comprises a sealing ring which is sleeved on the vertical part, the sealing ring is used for insulating and sealing a gap between the outer surface of the cover plate body and the transverse part, dust is further prevented from falling into the shell, the transverse part is prevented from being connected with the cover plate body and conducting electrons, and the anode pole can be further ensured to be connected with the anode connecting sheet and conduct electrons.
Furtherly, still be equipped with on the apron body and annotate the liquid hole, can annotate electrolyte in to the casing through annotating the liquid hole, make full use of apron structure for apron structural design is more reasonable.
Furthermore, a plurality of positive pole ears are in fan-shaped distribution, a plurality of negative pole ears are in fan-shaped distribution, and fan-shaped structural design is more matched with the structure of the cylindrical lithium ion battery, so that the areas of the positive pole and the negative pole lugs can be increased, the contact areas of the positive pole and the negative pole connecting pieces with the positive pole and the negative pole lugs are increased, and the stability of the positive pole and the negative pole connecting pieces being connected with the positive pole and the negative pole lugs is improved.
Drawings
The cover plate assembly of the present invention is described below in conjunction with a lithium ion battery with reference to the accompanying drawings, in which:
fig. 1 is an exploded view of a lithium ion battery of the present invention;
fig. 2 is a top view of the battery roll core of the present invention;
fig. 3 is a plan view of the lithium ion battery of the present invention.
List of reference numerals
1. A cover plate body; 11. a through hole; 12. a liquid injection hole;
2. a positive pole column; 21. a transverse portion; 22. a vertical portion;
3. a positive electrode connecting sheet;
4. a negative electrode connecting sheet; 41. a first connection portion; 42. a second connecting portion;
5. a positive electrode tab; 51. a positive electrode lug;
6. a negative electrode tab; 61. a negative electrode ear;
7. a housing;
8. a battery roll core;
91. a first insulating member; 911. an insulating ring; 912. a second flanging structure; 92. a second insulating member; 921. and (5) sealing rings.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present application has been described in connection with an electric vehicle, the present invention is not limited thereto, and the cover assembly may be applied to other vehicles such as a hybrid vehicle without departing from the spirit and scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inner", "outer", "upper", "lower", "top", "center", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "disposed" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection may be mechanical or direct. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Based on the technical problem who proposes in the background art, the utility model provides a apron subassembly for lithium ion battery, aim at setting up anodal utmost point post on the apron body, anodal utmost point post passes through anodal connection piece and lithium ion battery's anodal utmost point ear and is connected, negative pole connection piece and lithium ion battery's negative pole utmost point ear is connected, and the apron body passes through lithium ion battery's casing and is connected with the negative pole connection piece, anodal utmost point post that anodal utmost point ear passes through apron body one side promptly carries out the water conservancy diversion, negative pole utmost point ear welds the water conservancy diversion with shells inner wall, thereby realize lithium ion battery's anodal ear and the same one side of the electric current of negative pole utmost point ear and draw forth, lithium ion battery's assembly space utilization has been promoted.
Referring first to fig. 1, the cover plate assembly of the present invention will be described. Wherein, fig. 1 is an explosion diagram of the lithium ion battery of the present invention.
As shown in fig. 1, the cover plate assembly of the present invention comprises a cover plate body 1, a positive electrode post 2, a positive electrode connecting piece 3 and a negative electrode connecting piece 4, wherein the positive electrode post 2 is disposed on the cover plate body 1, and the positive electrode post 2 is connected with a positive electrode tab 5 of a lithium ion battery through the positive electrode connecting piece 3; the negative pole connection piece 4 sets up in the below of apron body 1 (be the below of paper in fig. 1), negative pole connection piece 4 is connected with lithium ion battery's negative pole utmost point ear 6, and apron body 1 is connected with negative pole connection piece 4 through lithium ion battery's casing 7, the negative pole directly just can be connected with negative pole utmost point ear 6 through casing 7 or apron body 1 promptly, need not to set up negative pole post, simplify lithium ion battery's structure, thereby lithium ion battery's metal material quantity has been reduced, weight reduction has been reached, the purpose of cost is practiced thrift.
Preferably, the positive electrode connecting piece 3 is connected with the positive electrode pole 2 and the positive electrode tab 5 by welding, for example, laser welding, ultrasonic torque welding, resistance welding, aluminum wire welding, and other welding methods. Among them, the laser welding may be laser pulse spot welding, laser penetration welding, or the like.
Preferably, the negative electrode connecting piece 4 is connected with the negative electrode tab 6 and the housing 7 by welding, for example, laser welding, ultrasonic torque welding, resistance welding, aluminum wire welding, and other welding methods.
Preferably, the housing 7 and the cover plate body 1 are connected by welding, for example, laser welding, ultrasonic torque welding, resistance welding, aluminum wire welding, or other welding methods.
The positive electrode tab and the negative electrode tab of the present invention will be described with reference to fig. 1 and 2. Wherein, fig. 2 is a top view of the battery roll core of the present invention.
As shown in fig. 1 and fig. 2, the positive electrode tab 5 and the negative electrode tab 6 are both disposed on the top of the battery roll core 8 of the lithium ion battery (i.e., the portion above the paper surface in fig. 1), so that the positive electrode tab 5 and the negative electrode tab 6 are located on the same side of the lithium ion battery, the total height of the positive electrode tab 5 and the negative electrode tab 6 of the lithium ion battery is reduced, and the overall space utilization rate of the lithium ion battery is further improved.
Preferably, the positive electrode tab 5 comprises a plurality of positive electrode tab portions 51, for example, any number such as 5, 8, 10 or 13, the plurality of positive electrode tab portions 51 are distributed in a fan shape, and the fan-shaped structural design is more matched with the structure of the cylindrical lithium ion battery, so that the area of the positive electrode tab 5 can be increased, the contact area between the positive electrode connecting piece 3 and the positive electrode tab 5 is further increased, and the stability of the connection between the positive electrode connecting piece 3 and the positive electrode tab 5 is improved. Of course, in practical applications, the plurality of positive electrode ears 51 may be distributed in other shapes such as a rectangle, a ring, or a quincunx.
Similarly, negative pole utmost point ear 6 includes a plurality of negative pole ear 61, for example, 5, 8, 10 or 13 arbitrary quantity such as, and a plurality of negative pole ears 61 are fan-shaped distribution, and fan-shaped structural design more matches with cylindrical lithium ion battery's structure, can increase negative pole utmost point ear 6's area, and then increase negative pole connection piece 4 and negative pole utmost point ear 6's area of contact, has improved the stability that negative pole connection piece 4 and negative pole utmost point ear 6 are connected. Of course, in practical applications, the plurality of negative electrode ears 61 may be distributed in other shapes such as a rectangle, a ring, or a quincunx.
The negative electrode connecting sheet of the present invention will be described with reference to fig. 1.
As shown in fig. 1, the negative electrode connecting sheet 4 includes a first connecting portion 41 and a second connecting portion 42 disposed on the first connecting portion 41, the first connecting portion 41 is connected with the negative electrode tab 6 in a laser pulse spot welding manner, the second connecting portion 42 is connected with the casing 7 in a laser welding manner, so that the casing 7 can be connected with the negative electrode tab 6 and conduct electrons, and the cover plate body 1 is connected with the casing 7 in a welding manner, so that the cover plate body 1 can be connected with the casing 7 and conduct electrons, that is, the current of the negative electrode tab 6 can be led out through the casing 7 or the cover plate body 1. Of course, the first connecting portion 41 and the negative electrode tab 6 may be connected by other welding methods such as ultrasonic torque welding, resistance welding, and aluminum wire welding, and the second connecting portion 42 and the case 7 may be connected by other welding methods such as ultrasonic torque welding, resistance welding, and aluminum wire welding.
Preferably, the shape of the first connection part 41 matches the shape of the negative electrode tab 6, for example, if the negative electrode tab 6 has a fan shape, the first connection part 41 also has a fan shape, increasing the contact area between the first connection part 41 and the negative electrode tab 6. Of course, when the negative electrode ear portion 61 has another shape such as a rectangular shape, a circular shape, or a quincunx shape, the first connecting portion 41 may have another shape such as a rectangular shape, a circular shape, or a quincunx shape.
Preferably, the second connecting portion 42 is a first flanging structure formed at the edge of the first connecting portion 41, and the first flanging structure is located at the top of the first connecting portion 41 (i.e. the position above the paper surface in fig. 1), and the first flanging structure is welded to the inner wall of the casing 7, so that the negative connecting piece 4 is connected to the casing 7 more firmly.
Furtherly, first flange structure's length and fan-shaped negative pole utmost point ear 6 arc length phase-match, the radius of curvature on first flange structure's arc limit equals with the radius of curvature of casing 7 inner wall moreover for whole first flange structure homoenergetic with casing 7's inner wall welded connection, further improved the fastness that negative pole connection piece 4 and casing 7 are connected.
Of course, the structure of the second connection portion 42 is not limited to the above-listed structure, and the second connection portion 42 may also include a first portion extending perpendicularly from the first connection portion 41 and a second portion extending perpendicularly from the first portion, the second portion being welded to the inner wall of the housing 7; alternatively, the second connection portion 42 may include a third portion horizontally extending from an edge of the first connection portion 41, and the third portion is welded to the inner wall of the housing 7. Any connection structure may be adopted as long as it can be connected to the inner wall of the housing 7.
The positive electrode terminal of the present invention will be described with reference to fig. 1 and 3. Fig. 3 is a plan view of the lithium ion battery of the present invention.
As shown in fig. 1, the positive electrode post 2 includes a lateral portion 21 and a vertical portion 22 extending vertically from the lateral portion 21 (i.e., extending downward in the drawing sheet in fig. 1); the cover plate comprises a cover plate body 1, a through hole 11 is formed in the cover plate body 1, a connecting end (namely one end below the paper surface in fig. 1) of a vertical part 22 penetrates through the through hole 11 and is connected with a positive connecting sheet 3 in a laser penetration welding mode, a first insulating part 91 is arranged between the cover plate body 1 and the positive connecting sheet 3 and between the cover plate body 1 and the vertical part 22, the cover plate body 1 is prevented from being connected with the positive connecting sheet 3 and conducting electrons, the cover plate body 1 is prevented from being connected with the vertical part 22 and conducting electrons, and the vertical part 22 can only be connected with the positive connecting sheet 3 and conduct electrons; and, be equipped with second insulating part 92 between horizontal part 21 and the apron body 1, avoided horizontal part 21 and apron body 1 to be connected and switch on electron for horizontal part 21 can only be connected and switch on electron with anodal connection piece 3 through vertical part 22, through the above-mentioned structural setting, make anodal utmost point post 2 only can be connected and switch on electron with anodal connection piece 3, avoided mutual interference between positive pole and the negative pole, improved lithium ion battery's performance. Of course, the connection mode of the vertical portion 22 and the positive electrode connecting piece 3 is not limited to the above-mentioned mode, and other welding modes such as ultrasonic torque welding, resistance welding, aluminum wire welding and the like may be adopted for connection.
Preferably, the transverse portion 21 and the vertical portion 22 are integrally formed, and an integrally formed structure is adopted, so that the processing and manufacturing of the grinding tool are facilitated. Of course, the transverse portion 21 and the vertical portion 22 may be connected by other methods such as welding.
Further, the cross section of the vertical part 22 is oblong, correspondingly, the cross section of the through hole 11 is oblong, and the oblong structure can prevent the vertical part 22 from rotating relative to the through hole 11, so that the overall anti-twisting characteristic of the positive electrode pole 2 is improved, the positive electrode pole can be twisted to a certain degree, and the problem of insufficient torsion of the large cylindrical lithium ion battery pole can be effectively solved. Of course, in practical applications, the cross section of the vertical portion 22 may be designed to be circular, square, triangular, etc., and correspondingly, the cross section of the through hole 11 may also be designed to be circular, square, triangular, etc.
It should be noted that the oblong shape includes four edges that are sequentially connected end to end, where two opposite edges are straight lines, and the other two opposite edges are arcs.
As shown in fig. 1, the first insulating member 91 includes an insulating ring 911 and a second flanging structure 912 extending outward (i.e., extending away from the insulating ring 911) from a lower edge (i.e., an edge below the paper surface in fig. 1) of the insulating ring 911, and the insulating ring 911 is disposed in the through hole 11 and sleeved on the vertical portion 22, so that dust is prevented from falling into the housing 7, and the cover plate body 1 is prevented from being connected to the vertical portion 22 and conducting electrons, so that the vertical portion 22 can only be connected to the positive connecting sheet 3 and conduct electrons; the second flanging structure 912 is located between the inner surface of the cover plate body 1 and the positive electrode connecting piece 3, so that the cover plate body 1 is prevented from being connected with the positive electrode connecting piece 3 and conducting electrons, and the positive electrode connecting piece 3 can only be connected with the positive electrode pole 2 and conducting electrons.
Preferably, the shape of the second flanging structure 912 and the shape of the positive electrode connecting sheet 3 are both matched with the shape of the positive electrode tab 5, for example, if the positive electrode tab 5 is fan-shaped, the positive electrode connecting sheet 3 is also fan-shaped, so that the contact area between the positive electrode connecting sheet 3 and the positive electrode tab 5 is increased; second flanging structure 912 is also fan-shaped, and the radius of curvature on the arc limit of fan-shaped positive pole utmost point ear 5, the radius of curvature of second flanging structure 912 and the radius of curvature of positive pole connection piece 3 are equal moreover for second flanging structure 912 can cover positive pole connection piece 3 completely, thereby avoids apron body 1 and positive pole connection piece 3 to be connected and switch on electron completely. Of course, when the positive electrode tab 5 has other shapes such as rectangular, annular or quincunx, the second flanging structure 912 and the positive electrode connecting piece 3 can be designed into other shapes such as rectangular, annular or quincunx.
Preferably, the insulation ring 911 and the second flanging structure 912 can be made of insulation plastic. Of course, the insulating material may be polytetrafluoroethylene, alumina, silicon dioxide, titanium dioxide, or the like.
Of course, the structure of the first insulating member 91 is not limited to the above-listed structure, for example, the first insulating member 91 may also include a first insulating layer disposed on the inner wall of the through hole 11 and a second insulating layer disposed on the inner surface of the cap body 1, wherein the first insulating layer and the second insulating layer may be made of insulating materials such as insulating plastic, teflon, alumina, silica, and titania. Whatever the structure, it is sufficient if the cover plate body 1 can be insulated from the positive electrode connecting piece 3 and the vertical portion 22.
As shown in fig. 1 and 3, the second insulating member 92 includes a sealing ring 921, the sealing ring 921 is sleeved on the vertical portion 22, the sealing ring 921 is used for insulating and sealing a gap between the outer surface of the cover plate body 1 and the transverse portion 21, so as to further prevent dust from falling into the housing 7, and further prevent the transverse portion 21 from being connected with the cover plate body 1 and conducting electrons, thereby further ensuring that the positive electrode post 2 can only be connected with the positive electrode connecting piece 3 and conducting electrons.
Preferably, the sealing ring 921 may be made of insulating plastic. Of course, it can also be made of insulating materials such as teflon, alumina, silica, titania, etc.
Of course, the structure of the second insulating member 92 is not limited to the above-mentioned structure, for example, the second insulating member 92 may include a third insulating layer provided on the inner surface of the cap body 1, wherein the third insulating layer may be made of insulating material such as insulating plastic, teflon, alumina, silica, titania, or the like. In any configuration, the lateral portion 21 may be insulated from the cap body 1.
The cover body of the present invention is further described with reference to fig. 1.
As shown in fig. 1, the central area of the cover plate body 1 is further provided with a liquid injection hole 12, and electrolyte can be injected into the casing 7 through the liquid injection hole 12, so that the cover plate structure is fully utilized, and the cover plate structure is more reasonable in design. Of course, in practical applications, the pour hole 12 may be provided in other locations of the lid body 1.
The method of assembling the lithium ion battery of the present invention will be described below with reference to fig. 1.
As shown in fig. 1, in the process of assembling the lithium ion battery, firstly, the positive electrode tab 5 and the negative electrode tab 6 at the top part of the battery winding core 8 after being wound are processed by kneading and leveling, the kneaded and leveled positive electrode tab 5 and the positive electrode connecting sheet 3 are processed by laser pulse spot welding, and the kneaded and leveled negative electrode tab 6 and the first connecting part 41 of the negative electrode connecting sheet 4 are processed by laser pulse spot welding; secondly, laser welding is carried out on the second connecting part 42 of the negative electrode connecting piece 4 and the inner wall of the shell 7, the positive electrode pole 2, the sealing ring 921 and the first insulating part 91 are connected with the cover plate body 1 through a riveting process, and laser penetration welding is carried out on the vertical part 22 of the positive electrode pole 2 and the positive electrode connecting piece 3; next, laser welding is performed on the edge of the cover plate body 1 and the edge of the shell opening of the shell 7; and finally, injecting electrolyte into the shell 7 through the injection hole 12, and welding and sealing the injection port after injection is finished.
In the using process of the lithium ion battery, the lithium ion battery is connected with the anode through the anode pole 2 and is connected with the cathode through the cover plate body 1 or the shell 7.
Those skilled in the art will appreciate that although some embodiments herein include some features included in other embodiments, not others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
In addition, the invention also provides a lithium ion battery, which comprises the cover plate component in any one of the above embodiments.
In addition, the invention also provides an electric automobile which comprises the cover plate assembly or the lithium ion battery in any one of the above embodiments.
So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims (10)
1. The cover plate assembly for the lithium ion battery is characterized by comprising a cover plate body, a positive pole, a positive connecting piece and a negative connecting piece, wherein the positive pole is arranged on the cover plate body and is connected with a positive pole lug of the lithium ion battery through the positive connecting piece;
the negative electrode connecting piece is arranged below the cover plate body and connected with a negative electrode lug of the lithium ion battery, and the cover plate body is connected with the negative electrode connecting piece through a shell of the lithium ion battery.
2. The cover plate assembly of claim 1, wherein the negative tab includes a first connection portion and a second connection portion disposed on the first connection portion, the first connection portion being connected to the negative tab, the second connection portion being connected to the housing.
3. The decking assembly defined in claim 2 wherein the second connecting portion is a first flange structure formed at an edge of the first connecting portion, the first flange structure being welded to the inner wall of the housing.
4. The cover plate assembly of claim 1, wherein the positive pole post includes a lateral portion and a vertical portion extending perpendicularly from the lateral portion;
the cover plate comprises a cover plate body and is characterized in that a through hole is formed in the cover plate body, the connecting end of the vertical portion penetrates through the through hole and is connected with the positive connecting sheet, a first insulating part is arranged between the cover plate body and the positive connecting sheet as well as between the cover plate body and the vertical portion, and a second insulating part is arranged between the horizontal portion and the cover plate body.
5. The cover plate assembly of claim 4, wherein the first insulating member includes an insulator ring disposed within the through-hole and disposed over the vertical portion and a second flange structure extending outwardly from a lower edge of the insulator ring, the second flange structure being located between the positive connector tab and an inner surface of the cover plate body.
6. The cover assembly of claim 4, wherein the second insulating member includes a sealing ring disposed over the vertical portion for insulating and sealing a gap between the outer surface of the cover body and the lateral portion.
7. The cover plate assembly as claimed in claim 1, wherein the cover plate body further comprises a liquid injection hole for injecting electrolyte into the casing.
8. The cover plate assembly of claim 1, wherein the positive tab includes a plurality of positive ears that are distributed in a sector shape; and/or
The negative pole utmost point ear includes a plurality of negative pole ears, a plurality of negative pole ears are fan-shaped distribution.
9. A lithium ion battery comprising the cover plate assembly of any one of claims 1-8.
10. A vehicle comprising the cover plate assembly of any one of claims 1 to 8 or the lithium ion battery of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220922769.9U CN217062311U (en) | 2022-04-20 | 2022-04-20 | Cover plate assembly for lithium ion battery, lithium ion battery and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115275529A (en) * | 2022-09-27 | 2022-11-01 | 楚能新能源股份有限公司 | Cylindrical lithium ion battery and preparation process thereof |
| CN115411465A (en) * | 2022-09-21 | 2022-11-29 | 深圳市赛尔摩星科技有限公司 | Cylindrical battery, battery module and electric device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115411465A (en) * | 2022-09-21 | 2022-11-29 | 深圳市赛尔摩星科技有限公司 | Cylindrical battery, battery module and electric device |
| CN115275529A (en) * | 2022-09-27 | 2022-11-01 | 楚能新能源股份有限公司 | Cylindrical lithium ion battery and preparation process thereof |
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