CN217009353U - Cylindrical battery and shell thereof - Google Patents

Abstract

The utility model discloses a cylindrical battery shell and a cylindrical battery, wherein the shell comprises: the end cover is provided with a cover through hole; a pole column, the pole column is worn to locate the cover through hole, and is located the inboard locating part of end cover is connected, wherein, the non-round hole of cover through hole, the pole column is worn to locate the outer peripheral face of the part of cover through hole be with cover through hole shape assorted non-circular. According to the shell, the limiting piece is connected with the pole, and the end cover is matched with the non-circular hole column between the poles, so that the pole is effectively limited on one hand, and the pole is prevented from rotating under the action of external force on the other hand, and the sealing performance and the structural strength of the shell are improved.

Description

Cylindrical battery and shell thereof

Technical Field

The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery shell and a cylindrical battery.

Background

With the increasing maturity of lithium ion battery technology, cylindrical batteries made of lithium ion batteries are also widely used in the field of electric vehicles as power batteries. The structural part of the cylindrical battery is also an important component of the lithium ion power battery, and not only can the safety and reliability of the lithium ion battery be guaranteed, but also the connection between a chemical system inside the lithium ion battery and an external module can be considered. Various connection relations exist in the structural member of the cylindrical battery, and the requirements of sealing performance and overcurrent performance are also considered, so the design scheme of the structural member is particularly important. In the correlation technique, do not carry on spacingly to the utmost point post of cylinder battery, utmost point post is for the end cover easily rotates, and then leads to having reduced the joint strength and the leakproofness of the casing of cylinder battery.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a cylindrical battery case that limits the position of the terminal and prevents the terminal from rotating under external force, thereby improving the sealing performance and structural strength of the case.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a housing for a cylindrical battery, the housing comprising: the end cover is provided with a cover through hole; the utmost point post, utmost point post wears to locate the lid through-hole, and with be located the inboard locating part of end cover is connected, wherein, lid through-hole non-round hole, utmost point post wears to locate the outer peripheral face of the part of lid through-hole be with lid through-hole shape assorted non-circular.

According to some embodiments of the utility model, the stopper has a stopper through hole opposite to the cover through hole, the post is inserted through the stopper through hole, and an inner end of the post is welded or riveted to the stopper.

According to some embodiments of the utility model, the post is riveted to the stopper, and the post comprises: the outer peripheral surface of the first cylinder is a non-cylindrical surface and penetrates through the cover through hole; the outer peripheral surface of the second column body is a cylindrical surface and is riveted with the limiting piece.

According to some embodiments of the utility model, the end cap includes a cap body, a first insulator disposed outside the cap body, and a second insulator disposed inside the cap body, the cap body having a mounting hole, at least one of the first insulator and the second insulator having an annular flange extending into the mounting hole, the annular flange defining the cap through hole.

In some embodiments, the mounting hole is a non-circular hole, and the outer peripheral surface of the annular flange is non-circular and matched with the shape of the mounting hole.

In some embodiments, the mounting hole and the cover through hole are the same or different in shape.

In some embodiments, the pole comprises a column body and a limit protrusion arranged at the outer end of the column body, the first insulating member is arranged between the limit protrusion and the cover body, the second insulating member is arranged between the cover body and the limit member,

the end cover is provided with an inward concave groove, and at least one part of the limiting convex part is positioned in the groove.

In some embodiments, the end cap further comprises a third insulator, the third insulator comprising: the end insulating part is arranged between the limiting convex part and the groove bottom surface of the groove and is in contact fit with the first insulating part; the side insulating part is arranged between the limiting convex part and the groove peripheral surface of the groove, and the side insulating part is connected with the end insulating part.

In some embodiments, the cover through hole is a rectangular hole, an elliptical hole, or a polygonal hole.

Compared with the prior art, the shell has the following advantages:

according to the shell, the limiting piece is connected with the pole, and the end cover is matched with the non-circular hole column between the poles, so that the pole is effectively limited on one hand, and the pole is prevented from rotating under the action of external force on the other hand, and the sealing performance and the structural strength of the shell are improved.

Another object of the present invention is to provide a cylindrical battery having the above-described case.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a top view of a cylindrical battery according to an embodiment of the present invention;

fig. 2 is a cross-sectional view taken along the direction of line C-C in fig. 1, showing a connection between a stopper and a post by riveting, according to a first embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a cross-sectional view taken along the line C-C in fig. 1, showing a connection between the stopper and the post by welding, according to a second embodiment of the present invention;

FIG. 5 is a partial enlarged view of FIG. 4 at B;

FIG. 6 is a top view of the cap body;

FIG. 7 is a cross-sectional view taken along line D-D of FIG. 6;

FIG. 8 is a schematic view of a pole wherein the second post is not riveted;

FIG. 9 is a schematic view of the first insulator of FIG. 5;

fig. 10 is a schematic view of the second insulator of fig. 5.

Reference numerals:

a cylindrical battery 1000;

a housing 100; a battery cell 400; a positive electrode 500; a negative current collector 600; a positive current collector 700;

an end cap 10; a cover through hole 101; a cap body 102; a first insulating member 103; a second insulator 104; a groove 105; mounting holes 106; an annular flange 107; a third insulating member 108; an end insulating portion 109; side insulating parts 110;

a pole 20; a first cylinder 201; a second cylinder 202; a limit protrusion 203;

a stopper 30; the through hole 301 is limited.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

In the description of the present invention, "a first feature" or "a second feature" may include one or more of the features, and "a plurality" means two or more, and the first feature may be "on" or "under" the second feature, and may include the first and second features being in direct contact, or may include the first and second features being not in direct contact but being in contact with another feature therebetween, and the first feature being "on", "above" and "above" the second feature may include the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is higher in level than the second feature.

The case 100 of the cylindrical battery 1000 according to the embodiment of the present invention is described below with reference to fig. 1 to 10.

Referring to fig. 2, the case 100 of the cylindrical battery 1000 according to the embodiment of the present invention includes: end cap 10 and pole 20.

The end cap 10 is provided with a cap through hole 101, the post 20 is inserted into the cap through hole 101, and the post 20 is connected to the limiting member 30 located inside the end cap 10. The cover through hole 101 is a non-circular hole, and the outer peripheral surface of the portion of the pole 20 penetrating through the cover through hole 101 is non-circular and matched with the shape of the cover through hole 101. In other words, the outer peripheral surface of the portion of the pole post 20 passing through the cover through-hole 101 is complementary to the shape of the cover through-hole 101.

It should be noted that "inside" refers to the inside of the housing 100, for example, "the inner end of the pole 20" refers to the lower end of the pole 20 shown in fig. 2; "outer" refers to the exterior of the housing 100, e.g., "outer end of the pole 20" refers to the upper end of the pole 20 shown in fig. 2; "peripheral surface" refers to the cylindrical side surface.

Specifically, the limiting member 30 and the terminal post 20 are connected to fix the terminal post 20 on the end cover 10, and the limiting member 30 is matched with the end cover 10 to prevent the terminal post 20 from coming off from the cover through hole 101, so that reliable connection and limitation between the terminal post 20 and the end cover 10 are ensured, and the terminal post 20 is stably and effectively electrically connected with the battery cell 400 inside the casing 100.

In some embodiments, as shown in fig. 2 and 3, the pole 20 is coupled to the end cap 10 to prevent the pole 20 from moving inward. Therefore, the limiting member 30 and the end cap 10 cooperate to effectively prevent the pole 20 from moving.

In addition, in the embodiment of the present invention, as shown in fig. 2 and 3, the non-circular hole column fit between the end cap 10 and the post 20 prevents the post 20 from rotating relative to the end cap 10 under the action of an external force, reduces abrasion between the post 20 and the end cap 10, avoids an increase in a fit gap between the post 20 and the end cap 10, and further improves the sealing performance of the housing 100 and the connection strength of the whole structure.

For example, in some embodiments, the cover through hole 101 includes, but is not limited to, a rectangular hole, an elliptical hole, a polygonal hole, and the like, and correspondingly, the shape of the outer peripheral surface of the portion of the pole 20 penetrating through the cover through hole 101 is complementary to the cover through hole 101.

According to the housing 100 of the present invention, as shown in fig. 2 and 3, the limit member 30 is connected to the pole 20, and the end cap 10 is engaged with the non-circular hole of the pole 20, so as to effectively limit the pole 20 and prevent the pole 20 from rotating under an external force, thereby improving the sealing performance and the structural strength of the housing 100.

In some embodiments, the post 20 is made of metal, such as aluminum.

According to some embodiments of the present invention, as shown in fig. 2 and 3, the limiting member 30 has a limiting through hole 301 opposite to the cover through hole 101, and the pole 20 is inserted through the limiting through hole 301. The limiting member 30 and the pole post 20 are connected in a hole-and-post fit manner, which facilitates the installation of the limiting member 30 on the pole post 20 and prevents the position interference between the limiting member 30 and other parts installed in the housing 100; on the other hand, the stress between the pole 20 and the limiting member 30 is uniform, the connection strength is improved, and the problem that the limiting member 30 falls off due to nonuniform stress is avoided.

In some embodiments, as shown in fig. 2-5, the connection manner of the inner end of the pole 20 and the stopper 30 includes, but is not limited to, welding and riveting. The welding and riveting connection strength is high, which is beneficial to improving the connection strength between the pole 20 and the limiting member 30, and is beneficial to improving the sealing performance between the pole 20 and the limiting member 30, thereby being beneficial to improving the sealing performance of the whole casing 100.

According to some embodiments of the present invention, as shown in fig. 2 and 8, the connection manner between the pole 20 and the limiting member 30 is a riveting connection, and the pole 20 includes a first cylinder 201 and a second cylinder 202.

The outer peripheral surface of the first cylinder 201 is a non-cylindrical surface, and the first cylinder 201 penetrates through the cover through hole 101; the outer peripheral surface of the second cylinder 202 is a cylindrical surface, and the second cylinder 202 is riveted to the limiting member 30.

Note that, in fig. 8, the second column 202 is in a state before caulking is not performed, and in fig. 2, the second column 202 is in a state after caulking.

Specifically, the non-cylindrical surface of the outer peripheral surface of the first column 201 is a rotation stopping structure of the pole 20, and the first column 201 is used for limiting, so that the pole 20 cannot rotate around the central shaft, thereby realizing a rotation stopping effect and ensuring the sealing performance of the casing 100. The outer peripheral surface of the second post 202 is a cylindrical surface, so that the force between the limiting member 30 and the pole 20 is uniform, and the riveting strength between the limiting member 30 and the pole 20 is improved.

In some embodiments, the cross-sectional shape of the first cylinder 201 includes, but is not limited to, polygonal, elliptical, etc.

According to some embodiments of the utility model, the end cap 10 includes a cap body 102. At this time, the pole 20 is directly engaged with the cover body 102, and the cover body 102 can prevent the pole 20 from rotating while limiting the pole 20.

For example, in some embodiments, the insulation may be performed by coating the portions of the post 20 and the cover body 102 that may contact with an insulating film. In this case, the pole 20 and the cap body 102 are directly fitted without an insulating member interposed therebetween.

In some embodiments, the lid body 102 is made of metal, such as steel.

According to some embodiments of the present invention, as shown in fig. 2, 6 and 7, the end cap 10 includes a cap body 102, a first insulator 103 disposed outside the cap body 102, and a second insulator 104 disposed inside the cap body 102.

The cover body 102 is provided with a mounting hole 106, and at least one of the first insulating member 103 and the second insulating member 104 is provided with an annular flange 107 extending into the mounting hole 106, the annular flange 107 defining the cover through-hole 101.

Specifically, the first insulating member 103 and the second insulating member 104 block the contact between the cap body 102 and the electrode post 20, thereby preventing the short circuit of the positive electrode and the negative electrode of the cylindrical battery 1000, and further improving the safety of the cylindrical battery 1000. In addition, the cover through hole 101 defined by the annular flange 107 is matched with the pole 20 through a non-circular hole, so that the effect of preventing the pole 20 from rotating is achieved, and the sealing performance of the shell 100 is improved.

In some embodiments, the first insulating member 103 is made of rubber (such as fluororubber), and has a sealing function, so as to improve the sealing performance of the housing 100.

In some embodiments, the material of the second insulating member 104 includes, but is not limited to, rubber, plastic, and the like.

In some embodiments, as shown in fig. 3, the first insulator 103 extends into the mounting hole 106 forming an annular flange 107, while the second insulator 104 does not extend into the mounting hole 106.

In some embodiments, as shown in fig. 5, the second insulator 104 extends into the mounting hole 106 forming an annular flange 107, while the first insulator 103 does not extend into the mounting hole 106.

In some embodiments, the first insulator 103 and the second insulator 104 are each provided with an annular flange 107 that extends into the mounting hole 106.

In some embodiments, as shown in fig. 6 and 9, the mounting hole 106 is a non-circular hole and the outer peripheral surface of the annular flange 107 is non-circular to match the shape of the mounting hole 106. In other words, the outer peripheral surface of the annular flange 107 is complementary in shape to the fitting portion of the mounting hole 106. In addition, the cover through hole 101 defined by the annular flange 107 is complementary to the shape of the matching part of the first pole post 20, so that the mounting hole 106 limits the rotation of the annular flange 107, and the cover through hole 101 defined by the annular flange 107 limits the rotation of the pole post 20, thereby improving the sealing performance of the shell 100.

In some embodiments, as shown in fig. 6 and 10, the mounting holes 106 and the cover through holes 101 are the same or different in shape.

Specifically, the annular flange 107 defines the cover through hole 101 in direct contact with and complementary to the outer peripheral surface of the pole 20, and the mounting hole 106 is also in direct contact with and complementary to the outer peripheral surface of the annular flange 107. However, the mounting hole 106 and the lid through hole 101 are not in direct contact with each other, but are connected by the annular flange 107, so that the mounting hole 106 and the lid through hole 101 may have the same shape if they are non-circular holes. The mounting hole 106 has the same shape as the cover through-hole 101, which can simplify the manufacturing process and improve the production efficiency.

In some embodiments, as shown in fig. 2 and 3, the pole 20 includes a cylindrical body and a position-limiting protrusion 203 disposed at an outer end of the cylindrical body, the first insulating member 103 is disposed between the position-limiting protrusion 203 and the cover body 102, and the second insulating member 104 is disposed between the cover body 102 and the position-limiting member 30. On one hand, the limiting convex part 203 increases the exposed surface area of the pole for welding with a battery cell module or a bus bar of a battery pack; on the other hand, the lower surface of the limit convex portion 203 contacts with the first insulating member 103, so that the pole 20 is prevented from moving in the axial direction, and meanwhile, the first insulating member 103 separates the limit convex portion 203 from the cover body 102, so that the short circuit caused by the contact of the limit convex portion 203 with the cover body 102 is prevented.

In addition, in the embodiment where the first insulating member 103 is made of a sealing material such as rubber, the first insulating member 103 is engaged with the limit projection 203, so that the sealing engagement area can be increased to improve the sealing effect.

In some embodiments, as shown in fig. 2 and 7, the outer surface of the end cap 10 is provided with an inwardly recessed groove 105, and at least a portion of the limit projection 203 is located within the groove 105. The groove 105 limits the pole 20, and can prevent the pole 20 from moving transversely.

In embodiments where the end cap 10 includes the cap body 102, the groove 105 may control the extent of the lateral play of the pole 20 within the extent of the groove 105.

In some embodiments, as shown in FIG. 2, the end cap 10 further includes a third insulator 108, the third insulator 108 including: an end insulating part 109 and a side insulating part 110.

The end insulating part 109 is arranged between the limiting convex part 203 and the groove bottom surface of the groove 105, and the end insulating part 109 is in contact fit with the first insulating part 103; the side insulating portion 110 is provided between the stopper protrusion 203 and the groove peripheral surface of the concave groove 105, and the side insulating portion 110 is connected to the end insulating portion 109. For example, the end portion insulating portion 109 may be formed as an annular sheet body, and the side portion insulating portion 110 may be formed as an annular cylinder body, one axial end of which is connected to a radially outer periphery of the annular sheet body, and a radially inner periphery of which is in contact-fit with the first insulating member 103.

Specifically, the end insulating portion 109 is spatially located between the limit projection 203 and the cover body 102, and restricts axial movement of the pole 20, and also prevents the limit projection 203 from being deformed by a force and contacting the end cover 10 to cause a short circuit. The side insulating part 110 laterally limits the limit protrusion 203 by the groove peripheral surface of the groove 105, thereby preventing the pole 20 from laterally moving and further enhancing the sealing performance of the housing 100.

The cylindrical battery 1000 according to another aspect of the embodiment of the present invention includes the case 100 of the cylindrical battery 1000 of the above embodiment.

In some embodiments, as shown in fig. 2, the cylindrical battery 1000 may further include a positive electrode 500, a negative electrode current collector 600, a positive electrode current collector 700, and the like. The axis of the positive pole 500 coincides with the pole 20 and penetrates through the center of the pole 20; the negative current collector 600 is provided at an end of the case 100 opposite to the end cap 10; the positive electrode current collector 700 is disposed on a side of the cell 400 facing the end cap 10.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A cylindrical battery case, comprising:

the end cover (10), the said end cover (10) has cover through holes (101);

an electrode post (20), the electrode post (20) is arranged in the cover through hole (101) in a penetrating way and is connected with a limiting piece (30) positioned on the inner side of the end cover (10), wherein,

the cover through hole (101) is a non-circular hole, and the pole (20) penetrates through the outer peripheral surface of the part of the cover through hole (101) and is in a non-circular shape matched with the shape of the cover through hole (101).

2. The housing for cylindrical batteries according to claim 1, wherein the limiting member (30) has a limiting through hole (301) opposite to the cover through hole (101), the pole (20) is inserted into the limiting through hole (301),

the inner end of the pole (20) is welded or riveted with the limiting piece (30).

3. The cylindrical battery case according to claim 1, wherein the pole (20) is riveted to the stopper (30), and the pole (20) comprises:

the outer peripheral surface of the first cylinder (201) is a non-cylindrical surface and penetrates through the cover through hole (101);

the outer peripheral surface of the second cylinder (202) is a cylindrical surface and is riveted with the limiting piece (30).

4. Cylindrical battery casing according to claim 1, characterized in that the end cap (10) comprises a cap body (102), a first insulator (103) provided outside the cap body (102) and a second insulator (104) provided inside the cap body (102),

the cover comprises a cover body (102) and is characterized in that a mounting hole (106) is formed in the cover body, at least one of the first insulating piece (103) and the second insulating piece (104) is provided with an annular flange (107) extending into the mounting hole (106), and the annular flange (107) limits the cover through hole (101).

5. The cylindrical battery case as claimed in claim 4, wherein the mounting hole (106) is a non-circular hole, and the outer peripheral surface of the annular flange (107) is non-circular in shape matching the shape of the mounting hole (106).

6. The cylindrical battery case according to claim 5, wherein the mounting hole (106) and the cover through hole (101) are the same or different in shape.

7. The cylindrical battery case as claimed in claim 4, wherein the pole (20) comprises a cylindrical body and a position-limiting protrusion (203) provided at an outer end of the cylindrical body, the first insulating member (103) is provided between the position-limiting protrusion (203) and the cap body (102), the second insulating member (104) is provided between the cap body (102) and the position-limiting member (30),

the end cover (10) is provided with an inward concave groove (105), and at least one part of the limiting convex part (203) is positioned in the groove (105).

8. The cylindrical cell casing of claim 7, wherein the end cap (10) further comprises a third insulator (108), the third insulator (108) comprising:

the end insulating part (109) is arranged between the limiting convex part (203) and the groove bottom surface of the groove (105), and the end insulating part (109) is in contact fit with the first insulating part (103);

the side insulating part (110) is arranged between the limiting convex part (203) and the groove peripheral surface of the groove (105), and the side insulating part (110) is connected with the end insulating part (109).

9. The cylindrical battery case according to any one of claims 1 to 8, wherein the cover through hole (101) is a rectangular hole, an elliptical hole, or a polygonal hole.

10. A cylindrical battery, characterized by comprising a case of the cylindrical battery according to any one of claims 1 to 9.

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