CN220628156U

CN220628156U - Cylindrical battery

Info

Publication number: CN220628156U
Application number: CN202321458677.0U
Authority: CN
Inventors: 徐雨
Original assignee: Weilai Battery Technology Anhui Co ltd
Current assignee: Weilai Battery Technology Anhui Co ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2024-03-19
Anticipated expiration: 2033-06-07

Abstract

The utility model relates to the technical field of batteries, and particularly provides a cylindrical battery, which aims to solve the problems that the space utilization rate of the conventional cylindrical battery is low, the cost is not saved, and the weight of the battery is reduced. For this purpose, the cylindrical battery of the present utility model comprises: a housing having an opening; the battery cell is arranged in the shell, and a first lug and a second lug are arranged on one side of the battery cell facing the opening; the cover plate is arranged at the opening and is provided with a through hole; and the pole is arranged in the through hole and is electrically connected with the first pole lug, and the cover plate is electrically connected with the second pole lug. According to the utility model, the first tab and the second tab extend from the same side of the battery core, so that the overall space utilization rate of the battery can be improved, the materials of part of the positive electrode tab and the negative electrode tab are saved, the cost is saved, the weight of the battery is convenient, meanwhile, the arrangement of the cover plate can meet the export of positive and negative electrode current, and the battery can be ensured to be normally used.

Description

Cylindrical battery

Technical Field

The utility model relates to the technical field of batteries, and particularly provides a cylindrical battery.

Background

The lithium ion battery (commonly called as a lithium battery) is a secondary battery using a lithium ion intercalation compound as a positive electrode material, and has the advantages of small volume, large capacity, long service life, low self-discharge rate, no memory effect, environmental protection and the like. Therefore, lithium batteries are increasingly used.

According to different shapes, lithium batteries can be classified into various types such as prismatic batteries, cylindrical batteries, soft-pack batteries, button batteries, and the like. Wherein the cylindrical battery includes a generally cylindrical housing and a jellyroll disposed within the housing. The winding core is formed by winding a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate. The positive plate is provided with a positive lug, and the negative plate is provided with a negative lug. The positive and negative lugs are respectively connected with positive and negative poles at two ends of the cylindrical battery through connecting sheets.

The cylindrical battery in the prior art is generally provided with the positive electrode lug and the negative electrode lug at the two ends of the winding core, and the positive electrode post and the negative electrode post are arranged at the two ends of the cylindrical battery, so that the space utilization rate of the whole cylindrical battery is lower, and the positive electrode lug and the negative electrode lug are arranged at the two ends of the winding core, so that the consumption of the metal material of the battery structural part is increased, the cost is not saved, and the weight of the battery is not facilitated.

In summary, the existing cylindrical battery has a low space utilization and is not beneficial to cost saving and weight reduction of the battery.

Accordingly, there is a need in the art for a new cylindrical battery to solve the above-described problems.

Disclosure of Invention

The utility model aims to solve the technical problems that the space utilization rate of the traditional cylindrical battery is low, and the cost is not saved and the weight of the battery is reduced.

The present utility model provides a cylindrical battery including:

a housing having an opening at one side;

the battery cell is arranged in the shell, and a first lug and a second lug are arranged on one side of the battery cell facing the opening;

the cover plate is arranged on the opening and is provided with a through hole;

and the pole is arranged in the through hole and is electrically connected with the first pole lug, and the cover plate is electrically connected with the second pole lug.

In the preferable technical scheme of the cylindrical battery, the cylindrical battery further comprises a first connecting sheet and a second connecting sheet,

the pole is connected with the first pole lug through the first connecting sheet, and the cover plate is connected with the second pole lug through the second connecting sheet.

In the preferred technical scheme of the cylindrical battery, the cover plate is provided with a groove, and the cover plate and the second connecting sheet are penetratingly welded together through the groove.

In the preferred technical scheme of the cylindrical battery, the second connecting piece is provided with a flange, the second connecting piece is connected with the inner wall of the shell through the flange, the cover plate is connected with the shell, and the cover plate is indirectly connected with the second connecting piece through the shell.

In a preferred embodiment of the above cylindrical battery, the first connecting piece has a circular plate-like structure, and/or the second connecting piece has a circular ring-like structure.

In a preferred embodiment of the above cylindrical battery, the cylindrical battery further includes a first insulating member disposed between the post and the cap plate.

In a preferred embodiment of the above cylindrical battery, the cylindrical battery further includes a second insulating member disposed between the first connecting piece and the cover plate.

In the preferred technical scheme of the cylindrical battery, the cover plate is further provided with a liquid injection port.

In the preferred technical scheme of the cylindrical battery, a plurality of first tabs are distributed in a circular ring shape to form a first tab group, a plurality of second tabs are distributed in a circular ring shape to form a second tab group, the first tab group is electrically connected with the pole, and the second tab group is electrically connected with the cover plate;

the first tab group and the second tab group are positioned on the same side of the winding core, and are distributed in concentric circles.

In the preferred technical scheme of the cylindrical battery, an annular space is formed between the first tab group and the second tab group.

In the case of adopting the above technical solution, the cylindrical battery of the present utility model includes: a housing having an opening at one side; the battery cell is arranged in the shell, and a first lug and a second lug are arranged on one side of the battery cell facing the opening; the cover plate is arranged at the opening and is provided with a through hole; and the pole is arranged in the through hole and is electrically connected with the first pole lug, and the cover plate is electrically connected with the second pole lug. According to the utility model, the first tab and the second tab extend from the same side of the winding core, so that the overall space utilization rate of the battery can be improved, the materials of part of the positive electrode tab and the negative electrode tab are saved, the cost is saved, the weight of the battery is convenient, and meanwhile, the arrangement of the cover plate can meet the requirement of leading out the positive electrode current and the negative electrode current from the battery, and the battery can be ensured to be normally used.

Drawings

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

FIG. 1 is a block diagram of a cell of the present utility model;

fig. 2 is a structural exploded view of a cylindrical battery according to a first preferred embodiment of the present utility model;

FIG. 3 is a block diagram of a cover plate in a first preferred embodiment of the present utility model;

fig. 4 is a structural exploded view of a cylindrical battery according to a second preferred embodiment of the present utility model;

reference numerals:

1. a battery cell; 11. a winding core; 12. the first tab group; 121. a first tab; 13. a second ear group; 131. a second lug; 14. spacing; 2. a housing; 3. a cover plate; 31. a through hole; 32. a liquid injection port; 33. an annular groove; 4. a pole; 5. a first connecting piece; 6. a second connecting piece; 61. a flange; 7. a first insulating member; 71. a first hole; 8. a second insulating member; 81. a second hole; 82. and a filling part.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model. For example, the present utility model does not limit the specific type of the vehicle to which the battery is applied, and a person skilled in the art can set the specific type of the vehicle according to the actual use requirement, for example, the vehicle can be a sedan type, an SUV type, or other types of vehicles, which is not limited. Those skilled in the art can adapt it as desired to suit a particular application.

It should be noted that, in the description of the present utility model, terms such as "inner", "outer", "upper", "lower", "left", "right", and the like indicate directions or positional relationships 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 apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, 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 utility model, unless explicitly specified and limited otherwise, the term "connected" should be interpreted broadly, and for example, it may be a fixed connection or a detachable connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Referring to fig. 1, as shown in fig. 1, the battery core 1 of the present utility model includes a winding core 11, a plurality of first tabs 121 and a plurality of second tabs 131, wherein the first tabs 121 and the second tabs 131 are connected with the winding core 11, the plurality of first tabs 121 are distributed in a ring shape to form a first tab group 12, the plurality of second tabs 131 are distributed in a ring shape to form a second tab group 13, the first tab group 12 and the second tab group 13 are located on the same side of the winding core 11, and the first tab group 12 and the second tab group 13 are distributed in concentric circles.

Specifically, the winding core 11 includes a positive electrode sheet (not shown in the figure), a negative electrode sheet (not shown in the figure), and a separator (not shown in the figure), and the positive electrode sheet, the negative electrode sheet, and the separator disposed between the positive electrode sheet and the negative electrode sheet are wound so that the winding core 11 is cylindrical, the plurality of first tabs 121 are distributed in parallel in a circular shape and are stacked to form a first tab group 12, the plurality of second tabs 131 are distributed circumferentially around the first tab group 12 at an end of the winding core 11, and the plurality of second tabs 131 are stacked to form a second tab group 13, that is, the circular first tab group 12 is located in an inner ring of the circular second tab group 13, and axes of the two are coincident.

Although in the preferred embodiment, the first tab set 12 and the second tab set 13 are concentrically distributed, this is not limitative, but in another possible embodiment, the first tab set 12 and the second tab set 13 are symmetrically distributed on the same side of the winding core 11, and the first tab set 12 and the second tab set 13 may be both fan-shaped, may be both arc-shaped, or may be distributed in other shapes, which can be set by a person skilled in the art according to practical situations.

Preferably, the first tab 121 is connected with the positive plate, the second tab 131 is connected with the negative plate, so that the first tab set 12 is positively charged, the second tab set 13 is negatively charged, based on the above structure, the positive tab and the negative tab are arranged on the same side of the winding core 11, compared with the prior art that the positive tab and the negative tab are arranged on two opposite sides of the winding core 11, the overall space utilization of the battery can be improved, the materials of part of the positive tab and the negative tab are saved, the cost is saved, and the weight of the battery is convenient.

It should be noted that, the electrical properties of the first tab set 12 and the second tab set 13 are not limited in the present utility model, so long as the connection between the first tab 121 and one of the positive electrode sheet and the negative electrode sheet is satisfied, the second tab 131 is connected to the other one of the positive electrode sheet and the negative electrode sheet, so that one of the first tab set 12 and the second tab set 13 is positively charged, and the other one of the first tab set 12 and the second tab set 13 is negatively charged, which can be set by a person skilled in the art according to the actual situation.

Further, in the preferred embodiment, an annular space 14 is formed between the first tab set 12 and the second tab set 13, and the annular space 14 completely isolates the first tab set 12 and the second tab set 13 from each other, so that no electrical connection exists between them; in another possible embodiment, an insulating member is disposed in the annular space 14 to avoid the electrical connection between the first tab set 12 and the second tab set 13, and the insulating member may be insulating rubber or insulating plastic, or may be other insulating materials, which can be set by a person skilled in the art according to practical situations.

Referring next to fig. 2 to 4, as shown in fig. 2 to 4, the cylindrical battery of the present utility model includes: the battery cell 1, the shell 2, the cover plate 3, the pole 4 and the battery cell 1 are arranged in the shell 2, the battery cell 1 comprises a winding core 11, a first pole lug 121 and a second pole lug 131, and the first pole lug 121 and the second pole lug 131 extend from the same side of the winding core 11; the shell 2 is provided with an opening, the cover plate 3 is connected with the shell 2, the cover plate 3 can close the opening, and the cover plate 3 is positioned on one side of the winding core 11, provided with the first tab 121 and the second tab 131; the cover plate 3 is provided with a through hole 31, the pole 4 passes through the through hole 31 to be electrically connected with the first pole lug 121, and the cover plate 3 is electrically connected with the second pole lug 131.

Specifically, with the direction shown in fig. 2 as the reference direction, first tab 121 and second tab 131 are located the top of core 11, apron 3 is located the top of core 11, be formed with in casing 2 and hold the cavity (not shown in the figure) that can hold electric core 1, the end connection of apron 3 and casing 2 is in order to seal and hold the cavity, electric core 1 sets up in holding the cavity, be provided with the through-hole 31 that supplies post 4 to pass on the apron 3, post 4 passes through-hole 31 and is connected with first tab 121 electricity, apron 3 and second tab 131 electricity are connected, based on above-mentioned structure setting, first tab 121 and second tab 131 extend out by the same side of core 11, can promote the holistic space utilization of battery, and save the material of some anodal tabs and negative pole tabs, the cost is saved, be convenient for the battery lightweight, simultaneously, the setting of apron 3 can satisfy leading out the positive negative and negative pole electric current to the battery, guarantee that the battery can be used normally.

In another possible embodiment, the first tab 121 and the second tab 131 are both located below the winding core 11, and the cover 3 is also located below the winding core 11.

It will be understood by those skilled in the art that the specific number of the first tabs 121 and the second tabs 131 is not limited in the present utility model, the number of the first tabs 121 may be one or more, in which case the number of the first tabs 121 is more than one, the number of the first tabs 121 form the first tab group 12, the number of the second tabs 131 may be more than one, and in which case the number of the second tabs 131 is more than one, the number of the second tabs 131 form the second tab group 13, which can be set by those skilled in the art according to the actual situation.

Further, in the present utility model, the cylindrical battery further includes a first connection piece 5 and a second connection piece 6, and in the case that the number of the first tab 121 and the second tab 131 is one, the post 4 is connected to the first tab 121 through the first connection piece 5, and the cover plate 3 is connected to the second tab 131 through the second connection piece 6; in the case that the first tab 121 and the second tab 131 are plural and form the first tab group 12 and the second tab group 13, respectively, the post 4 is connected to the first connection piece 5 through the through hole 31, the post 4 is connected to the first tab group 12 through the first connection piece 5, the second connection piece 6 is connected to the second tab group 13, and the second connection piece 6 is located between the cover plate 3 and the second tab group 13; of course, this is only a preferred arrangement, and in another possible embodiment, the pole 4 is directly connected to the first tab 121 or the first tab set 12, and the cover 3 is directly connected to the second tab 131 or the second tab set 13, which can be set by a person skilled in the art according to the actual situation.

In the cylindrical battery of the present utility model, the first tab group 12, which will be described later, is preferably positively charged, and the second tab group 13 is preferably negatively charged.

As shown in fig. 2, in the first preferred example of the cylindrical battery of the present utility model, the second connection piece 6 is welded to the second tab set 13, the second connection piece 6 is directly welded to the cover plate 3, so that the cover plate 3 is negatively charged, the first connection piece 5 is welded to the first tab set 12, and the central position of the pole 4 is welded to the first connection piece 5 by laser, so that the pole 4 is positively charged.

Referring next to fig. 2 and 3, as shown in fig. 2 and 3, the cover plate 3 is provided with a groove, and the cover plate 3 is penetratingly welded with the second connecting piece 6 through the groove. Specifically, the recess is ring channel 33, and the axis of ring channel 33 and the axis coincidence of second connection piece 6, and when apron 3 and second connection piece 6 were fixed through penetrating the welding, can form a plurality of solder joints on the apron 3, the solder joint can be hidden in the setting of ring channel 33 for the surface of apron 3 is more level and smooth, does not hinder the installation of other spare parts in the battery, guarantees battery inner structure's stability.

It should be noted that the specific structure of the groove is not limited in the present utility model, for example, the groove is a plurality of arc grooves formed in the cover plate 3, the arc grooves are circumferentially formed around the axis of the cover plate 3 and uniformly distributed, and the groove may be a plurality of cylindrical grooves, so long as the welding spots can be hidden, and those skilled in the art can set the groove according to the actual situation.

Further, in the battery in the first preferred example, the cover plate 3 is further provided with a liquid injection port 32, and in the case that the cover plate 3 and the housing 2 are connected in place, the liquid injection port 32 is connected with the accommodating cavity formed by the housing 1, and the electrolyte is conveniently injected into the accommodating cavity by the arrangement of the liquid injection port 32.

Furthermore, in the battery in the first preferred embodiment, the battery further includes a first insulating member 7, and the first insulating member 7 is disposed between the post 4 and the cap plate 3. The first insulator 7 is centrally provided with a first hole 71 so that the pole 4 can pass through the first insulator 7, and as shown in fig. 2, the first insulator 7 can insulate the pole 4 and the cover plate 3 in the up-down direction, preventing a short circuit from occurring, and preventing the battery from being burnt out, and further, the diameter of the first hole 71 is set smaller than the diameter of the through hole 31, based on which, in the case where the pole 4 is installed in place, the pole 4 is located in a gap existing between the outer side surface of the pole 4 in the portion in the through hole 31 and the inner wall of the through hole 31, so that the pole 4 and the cover plate 3 are insulated in the left-right direction, preventing the short circuit from occurring, and preventing the battery from being burnt out.

In another possible embodiment, the battery does not comprise the first insulating member 7, and in the case where the post 4 and the cap plate 3 are connected in place, the through holes 31 on the post 4 and the cap plate 3 do not come into contact, and gaps are formed on the upper surfaces of the post 4 and the cap plate 3 and the inner sides of the post 4 and the through holes 31 to avoid the electrical connection of the post 4 and the cap plate 3.

Further, the battery further includes a second insulator 8, the second insulator 8 being disposed between the first connection tab 5 and the cap plate 3, and the post 4 fixing the first insulator 7, the second insulator 8 and the cap plate 3 through a caulking process. Specifically, the second insulating member 8 is provided with the second hole 81, the pole 4 passes through the first hole 71, the through hole 31 and the second hole 81 to be connected with the first connecting piece 5, and the second insulating member 8 can insulate and cut off the electrical connection between the first connecting piece 5 and the cover plate 3 in the up-down direction, so that the short circuit caused by the electrical connection between the first connecting piece 5 and the cover plate 3 is avoided, and the battery is prevented from being burnt out.

In addition, the second insulator 8 is provided with a filling portion 82, and in the case where all the components of the battery are mounted in place, the filling portion 82 is located in a gap existing between the outer side surface of the pole 4 and the inner wall of the through hole 31, so that the pole 4 and the cover plate 3 are insulated in the left-right direction.

In a possible embodiment, the second insulating member 8 is not provided with a filling portion 82, the first insulating member 7 is provided with a filling portion, the filling portion is located below the first insulating member 7, and the filling portion is located in the gap between the pole 4 and the through hole 31 with the first insulating member 7 in place.

In another possible embodiment, the second insulating member 8 is not provided, and the diameter of the first connecting piece 5 is set smaller than the diameter of the through hole 31, on the basis of which the first connecting piece 5 is not electrically connected with the cover plate 3 in the up-down direction.

In another possible embodiment, the second insulating member 8 is not provided, and a gap exists between the cover plate 3 and the first connecting piece 5 in the state where the cover plate 3 and the first connecting piece 5 are mounted in place, specifically, a groove is provided at a position of the cover plate 3 corresponding to the first connecting piece 5, the groove being such that the cover plate 3 and the first connecting piece 5 are not electrically connected, or it is also possible to form a gap between the cover plate 3 and the first connecting piece 5 by reducing the thickness of the first connecting piece 5.

The specific materials of the first insulating member 7 and the second insulating member 8 are not limited, and may be insulating rubber, insulating plastic, or other insulating materials, which can be set by a person skilled in the art according to actual situations.

Further, the first connecting piece 5 has a circular plate-like structure, and the second connecting piece 6 has a circular ring-like shape. The first connecting piece 5 is positioned in the inner ring of the circular ring of the second connecting piece 6, and a gap is arranged between the first connecting piece 5 and the second connecting piece 6, so that the first connecting piece 5 and the second connecting piece 6 are prevented from being directly connected.

In a further possible embodiment, an insulation is provided in the gap between the first connecting piece 5 and the second connecting piece 6.

It should be noted that the specific structures of the first connecting piece 5 and the second connecting piece 6 are not limited in the present utility model, for example, the first connecting piece 5 is also in a ring shape, the inner side wall of the middle hole of the first connecting piece 5 is welded with the pole 4, and based on this, the pole 4 is welded with the first tab group 12; the second connecting piece 6 is a plurality of arc-shaped pieces which are circumferentially arranged around the axis of the battery cell 1 to form a circular connecting piece; and the person skilled in the art can set the setting according to the actual situation.

Referring next to fig. 4, as shown in fig. 4, the battery according to the second preferred embodiment of the present utility model differs from the battery according to the first preferred embodiment only in that the second connecting piece 6 is not connected to the cap plate 3, the second connecting piece 6 is provided with a flange 61, the flange 61 is formed in a circular ring shape, the second connecting piece 6 is connected to the inner wall of the case 2 through the flange 61 around the second connecting piece 6, and the cap plate 3 is indirectly connected to the second connecting piece 6 through the case 2. The housing 2 is negatively charged, and since the cover plate 3 is connected to the housing 2, the cover plate 3 is negatively charged and the post 4 is positively charged. The second connecting piece 6 is connected with the shell 2 and is not connected with the cover plate 3, so that the battery is convenient to assemble.

It will be understood by those skilled in the art that, although in the present utility model, the through hole 31 is disposed at the center of the cover plate 3, the first connection piece 5 is in a circular plate structure, and the second connection piece 6 is in a circular ring shape, this is not limitative, but in another possible example, the first tab 121 and the second tab 131 are symmetrically distributed on the same side of the winding core 11, and the first tab set 12 and the second tab set 13 are both in a sector shape, the disposition position of the through hole 31 corresponds to the first tab set 12, and the first connection piece 5 and the second connection piece 6 are both in a sector shape or a disc shape; as long as the positions of the through holes 31 are set so as to correspond to the first tab group 12, the first connecting piece 5 and the first tab group 12 have the same shape, and the second connecting piece 6 and the second tab group 13 have the same shape, so that the present utility model can be set by a person skilled in the art according to the actual situation.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims

1. A cylindrical battery, characterized in that the cylindrical battery comprises:

a housing having an opening at one side;

the cover plate is arranged on the opening and is provided with a through hole;

2. The cylindrical battery of claim 1, further comprising a first connecting tab and a second connecting tab,

3. The cylindrical battery according to claim 2, wherein a groove is provided in the cover plate, and the cover plate is penetration welded with the second connecting piece through the groove.

4. The cylindrical battery according to claim 2, wherein a flange is provided on the second connecting piece, the second connecting piece is connected with the inner wall of the housing through the flange, the cover plate is connected with the housing, and the cover plate is indirectly connected with the second connecting piece through the housing.

5. The cylindrical battery according to claim 2, wherein the first connecting piece has a circular plate-like structure in shape and/or the second connecting piece has a circular ring-like shape.

6. The cylindrical battery of claim 1, further comprising a first insulator disposed between the post and the cover plate.

7. The cylindrical battery of claim 2, further comprising a second insulator disposed between the first connecting tab and the cover plate.

8. The cylindrical battery according to any one of claims 1 to 7, wherein the cap plate is further provided with a liquid filling port.

9. The cylindrical battery according to any one of claims 1 to 7, wherein a plurality of the first tabs are annularly distributed to form a first tab group, a plurality of the second tabs are annularly distributed to form a second tab group, the first tab group and the post are electrically connected, and the second tab group is electrically connected with the cap plate;

the first tab group and the second tab group are positioned on the same side of the battery cell, and are distributed in concentric circles.

10. The cylindrical battery of claim 9, wherein an annular space is formed between the first tab set and the second tab set.