CN219086100U

CN219086100U - Cylindrical battery and battery pack

Info

Publication number: CN219086100U
Application number: CN202320035038.7U
Authority: CN
Inventors: 孙倩倩; 齐彬伟; 王亚威; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-05-26
Anticipated expiration: 2033-01-06
Also published as: DE202023102577U1

Abstract

The utility model relates to the technical field of batteries, and provides a cylindrical battery and a battery pack. The cylindrical battery includes: the battery cell comprises a battery cell main body, a first tab area and a second tab area, wherein the first tab area and the second tab area with opposite polarities extend from the same end of the battery cell main body; the battery comprises a battery body, a first current collector, a second current collector, a first electrode lug area, a second electrode lug area, a battery and a battery post assembly, wherein the first current collector comprises a first area and a second area, the first area is welded with the first electrode lug area, the second area faces the battery body, orthographic projection of the end face of the second electrode lug area is led out of the battery body, and at least part of the second electrode lug area is overlapped, so that the overcurrent area of the first current collector is increased.

Description

Cylindrical battery and battery pack

Technical Field

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

Background

In the related art, the cylindrical battery comprises a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab extend from opposite ends of the battery core, so that the utilization rate of the whole internal space of the battery is reduced, and the electron transmission path is possibly increased to be longer under certain conditions, so that the whole quick charge capacity of the battery is affected.

Disclosure of Invention

The utility model provides a cylindrical battery and a battery pack, which are used for improving the service performance of the cylindrical battery.

According to a first aspect of the present utility model, there is provided a cylindrical battery comprising:

the battery cell comprises a battery cell main body, a first tab area and a second tab area, wherein the first tab area and the second tab area with opposite polarities extend from the same end of the battery cell main body;

the first current collector comprises a first area and a second area, the first area is welded with the first tab area, and orthographic projection of the end face of the second tab area, which is led out from the second area towards the battery cell main body, coincides with at least part of the second tab area.

The cylindrical battery comprises a battery core and a first current collector, wherein the battery core comprises a battery core main body, a first tab area and a second tab area, the first tab area and the second tab area with opposite polarities extend out from the same end of the battery core main body, so that the space occupation rate of the battery core can be reduced, the space utilization rate of the battery can be improved to a certain extent, the first current collector comprises a first area and a second area, the first area is welded with the first tab area, the orthographic projection of the end face of the second area, which is led out of the second tab area, towards the battery core main body is overlapped with the second tab area, namely the area of the second area, which is not welded with the first tab area, can be relatively larger, the overcurrent area of the first current collector is increased, the overcurrent area of the second area is increased when the second area is connected with a pole assembly or a battery shell, and the battery can be quickly transmitted to an adjacent cylindrical battery when the cylindrical battery is grouped, so that the quick charge capacity of the cylindrical battery is improved, and the service performance of the cylindrical battery is improved.

According to a second aspect of the present utility model, there is provided a battery pack comprising the above-described cylindrical battery.

The cylindrical battery of the battery pack comprises the battery core and the first current collector, wherein the battery core comprises the battery core main body, the first tab area and the second tab area, the polarities of the first tab area and the second tab area are opposite, the first tab area and the second tab area extend out of the same end of the battery core main body, so that the space occupation rate of the battery core can be reduced, the space utilization rate of the battery can be improved to a certain extent, the first current collector comprises the first area and the second area, the first area is welded with the first tab area, the orthographic projection of the end face of the second area, which is led out of the second tab area, towards the battery core main body is overlapped with the second tab area, namely the area of the second area which is not welded with the first tab area can be relatively larger, the overcurrent area of the first current collector is increased, and the overcurrent area of the second area can be increased when the second area is connected with a pole assembly or a battery shell, and the battery can be quickly transmitted to the adjacent cylindrical battery when the cylindrical battery is assembled, so that the quick charge capacity of the cylindrical battery is improved, and the service performance of the battery pack is improved.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic view showing a structure of a cylindrical battery according to an exemplary embodiment;

fig. 2 is a partial schematic structure of a cylindrical battery according to an exemplary embodiment;

fig. 3 is a partially exploded structural view of a cylindrical battery according to an exemplary embodiment;

fig. 4 is a schematic structural view of a battery cell and a first current collector of a cylindrical battery according to an exemplary embodiment;

fig. 5 is a schematic structural view of a battery cell and a second current collector of a cylindrical battery according to an exemplary embodiment;

fig. 6 is a schematic structural view of a battery cell of a cylindrical battery according to the first exemplary embodiment;

Fig. 7 is a schematic structural view of a battery cell of a cylindrical battery according to a second exemplary embodiment;

fig. 8 is a schematic structural view of a battery cell of a cylindrical battery according to a third exemplary embodiment;

fig. 9 is a schematic structural view of a battery pack according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a battery cell; 11. a cell body; 111. a central bore; 12. a first tab region; 13. a second ear region; 14. a spacing region; 20. a first current collector; 21. a first region; 22. a second region; 23. a fifth region; 30. a second current collector; 31. a third region; 32. a fourth region; 40. a battery case; 50. a pole assembly; 60. a first bus bar; 70. and a second bus bar.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, 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 unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

An embodiment of the present utility model provides a cylindrical battery, referring to fig. 1 to 8, comprising: the battery cell 10, the battery cell 10 includes a battery cell main body 11, a first tab area 12 and a second tab area 13, wherein the first tab area 12 and the second tab area 13 with opposite polarities extend from the same end of the battery cell main body 11; the first current collector 20, the first current collector 20 includes a first area 21 and a second area 22, the first area 21 is welded with the first tab area 12, and the orthographic projection of the end surface of the second area 22, which is led out of the second tab area 13 toward the cell main body 11, coincides with at least part of the second tab area 13.

The cylindrical battery according to one embodiment of the present utility model includes a battery core 10 and a first current collector 20, where the battery core 10 includes a battery core main body 11, a first tab area 12 and a second tab area 13, and the first tab area 12 and the second tab area 13 with opposite polarities extend from the same end of the battery core main body 11, so that the space occupation rate of the battery core 10 can be reduced, the space utilization rate of the cylindrical battery can be improved to a certain extent, the first current collector 20 includes a first area 21 and a second area 22, the first area 21 is welded with the first tab area 12, the orthographic projection of the end surface of the second area 22, which is led out of the second tab area 13 toward the battery core main body 11, coincides with the second tab area 13, that is, the area of the second area 22, which is not welded with the first tab area 12, can be relatively larger, thereby increasing the overcurrent area of the first current collector 20, and when the second area 22 is connected with a pole assembly or a battery housing, the overcurrent area of the two can be increased, and when the cylindrical battery is grouped, the battery can also be quickly transferred to an adjacent cylindrical battery, thereby improving the performance of the cylindrical battery.

It should be noted that, the battery core 10 of the cylindrical battery includes a battery core main body 11, a first tab area 12 and a second tab area 13, the first tab area 12 and the second tab area 13 with opposite polarities extend from the same end of the battery core main body 11, and compared with the first tab area 12 and the second tab area 13 extending from opposite ends of the battery core main body 11, the overall height of the battery core 10 in this embodiment is relatively low, and when the battery core 10 is installed in the battery housing, the space utilization rate of the battery housing can be improved, so as to avoid the excessive space occupied by the battery core 10.

The first current collector 20 includes a first area 21 and a second area 22, where the first area 21 is welded to the first tab area 12, so that the battery core 10 is electrically connected to the first current collector 20, and the orthographic projection of the end surface of the second area 22, which is led out of the second tab area 13 toward the battery core main body 11, coincides with the second tab area 13, that is, the area of the second area 22 can be relatively larger on the basis of the insulation between the first current collector 20 and the second tab area 13, and when the second area 22 is used for connecting a battery case or a pole assembly, the overcurrent area of the second area 22 can be increased, so that the safety service performance of the battery is improved, and the problem of overcurrent deficiency is avoided.

The first tab area 12 and the second tab area 13 with opposite polarities are arranged in an insulating manner, and the first tab area 12 may be electrically connected to the first current collector 20, so that the second tab area 13 and the first current collector 20 are arranged in an insulating manner, for example, a space is arranged between the second tab area 13 and the first current collector 20, if the orthographic projection of the end surface of the second area 22, which is led out of the second tab area 13 towards the battery main body 11, is not overlapped with the second tab area 13, although the insulating performance between the second tab area 13 and the first current collector 20 may be increased, the overcurrent capability of the first current collector 20 may be reduced, so that in this embodiment, it is required to ensure that the orthographic projection of the end surface of the second area 22, which is led out of the second tab area 13 towards the battery main body 11, is overlapped with the second tab area 13, for example, as shown in connection with fig. 4. The insulation manner between the second tab area 13 and the first current collector 20 is not limited, and may be selected according to actual requirements.

In one embodiment, as shown in fig. 5, the cylindrical battery further includes a second current collector 30, the second current collector 30 being electrically connected to the second tab region 13, such that the second tab region 13 may be used to form an electrical connection with other structures through the second current collector 30.

The first current collector 20 and the second current collector 30 may be insulated, for example, an insulating structure may be disposed between the first current collector 20 and the second current collector 30, or an air separation may be used between the first current collector 20 and the second current collector 30, which is not limited herein.

In one embodiment, as shown in fig. 5, the second current collector 30 includes a third area 31 and a fourth area 32, the third area 31 is welded with the second tab area 13, the orthographic projection of the end surface of the fourth area 32, which is led out of the first tab area 12 toward the battery main body 11, coincides with at least part of the first tab area 12, that is, the area of the fourth area 32, which is not welded with the second tab area 13, may be relatively larger, so as to increase the current passing area of the second current collector 30, and when the fourth area 32 is connected with the electrode post assembly or the battery case, the current passing area of the fourth area 32 and the electrode post assembly or the battery case may be increased, and when the cylindrical batteries are grouped, the batteries may also be quickly transferred to adjacent cylindrical batteries, so as to improve the quick charge capability of the cylindrical batteries.

In some embodiments, the second current collector 30 includes a third region 31 and a fourth region 32, the third region 31 is welded to the second tab region 13, and an orthographic projection of the fourth region 32 toward the end face of the cell body 11 leading out of the first tab region 12 is not coincident with the first tab region 12.

In one embodiment, the orthographic projection of the end surface of the fourth region 32, which leads out of the second tab region 13 toward the battery cell main body 11, coincides with the second tab region 13, that is, the area of at least one of the fourth region 32 and the second tab region 13 may be relatively large, so that not only the overcurrent area may be increased, the service performance of the battery may be ensured, but also the risk that the second tab region 13 overlaps with the first current collector 20 may be avoided, thereby improving the safe service performance of the battery.

The orthographic projection of the end surface of the fourth region 32, which leads out of the second tab region 13 toward the battery core main body 11, coincides with the second tab region 13, for example, the area of the second tab region 13 may be relatively large, at this time, the overcurrent capability of the second tab region 13 may be improved, and the fourth region 32 may form protection for the second tab region 13 in the height direction, so that the erroneous contact between the second tab region 13 and the first current collector 20 may be avoided to some extent.

In one embodiment, as shown in fig. 1, the cylindrical battery further includes a battery case 40 and a post assembly 50, the post assembly 50 is disposed on the battery case 40, one of the first current collector 20 and the second current collector 30 is electrically connected to the battery case 40, and the other is electrically connected to the post assembly 50, so that the battery case 40 and the post assembly 50 can be used as two electrode terminals of the battery, thereby facilitating charge and discharge of the battery.

The battery shell 40 is used as one electrode leading-out end of the battery, so that the number of components of the cylindrical battery can be reduced, and each position of the battery shell 40 can be used as an electric connection position, thereby improving the electric connection selectivity of the cylindrical battery during grouping.

In one embodiment, as shown in fig. 1 to 5, the first current collector 20 includes a first region 21 and a second region 22, the second current collector 30 includes a third region 31 and a fourth region 32, the first region 21 may be located outside the second region 22, the third region 31 may be located outside the fourth region 32, at this time, the second region 22 may be connected with the battery case 40, and the fourth region 32 may be connected with the tab assembly 50.

In one embodiment, the fourth region 32 is welded to the pole assembly 50, and the pole assembly 50 is disposed at the central position of the battery housing 40, so that not only can the connection between the fourth region 32 and the pole assembly 50 be conveniently achieved, but also the disposition position of the pole assembly 50 can be more reasonable, structural damage to the battery housing 40 caused by the pole assembly 50 is avoided, and the force applied to each position of the battery housing 40 by the pole assembly 50 at the central position can be relatively uniform, thereby improving the safety performance of the battery.

In one embodiment, the second region 22 is welded to the battery housing 40; the first welding marks formed by welding the first region 21 and the first tab region 12 and the second welding marks formed by welding the second region 22 and the battery case 40 are arranged at intervals, so that the risk of welding through the first current collector 20 due to welding marks overlapping in the process of performing secondary welding on the first current collector 20 can be avoided, and the safe use performance of the first current collector 20 is ensured.

In one embodiment, the third welding marks formed by welding the third region 31 and the second tab region 13 and the fourth welding marks formed by welding the fourth region 32 and the pole assembly 50 are arranged at intervals, so that the risk of welding through the second current collector 30 due to overlapping welding marks in the secondary welding process of the second current collector 30 can be avoided, and the safe use performance of the second current collector 30 can be ensured.

It should be noted that, the first welding mark formed by welding the first region 21 and the first tab region 12 is spaced from the second welding mark formed by welding the second region 22 and the battery case 40, or the third welding mark formed by welding the third region 31 and the second tab region 13 is spaced from the fourth welding mark formed by welding the fourth region 32 and the pole assembly 50, where the space mainly represents that the first welding mark is not overlapped with the second welding mark, the third welding mark is not overlapped with the fourth welding mark, but the situation that the first welding mark and the second welding mark are partially connected is not completely excluded, or the situation that the third welding mark and the fourth welding mark are partially connected may occur, after all, in the welding process, the error contact may occur.

In one embodiment, the first current collector 20 is a current collecting plate, and the second region 22 is at least partially disposed around the periphery of the first region 21, so that the first region 21 and the second region 22 can be connected, and the second region 22 can have a reliable area, so that the overcurrent capability is ensured.

In one embodiment, the width of the second region 22 is 0.5mm-10mm along the radial direction of the cell main body 11, so that the second region 22 can be ensured to have a reasonable width, thereby ensuring the overcurrent area of the second region 22, avoiding the problem of insufficient overcurrent capability when the second region 22 is welded with the cell casing or the pole assembly, and also avoiding the problem that the size of the first region 21 is influenced by the overlarge width of the second region 22.

The smaller width of the second region 22 may result in the difficulty of welding the second region 22 to the battery case or the tab assembly, and the smaller flow area, the larger width of the second region 22 may result in the relatively smaller flow area of the first region 21. In this embodiment, by making the width of the second region 22 0.5mm to 10mm, the welding area of the first current collector 20 can be reasonably controlled.

In one embodiment, the width of the second region 22 is 1mm-5mm in the radial direction of the cell body 11, so that the second region 22 has a reasonable overcurrent area.

In one embodiment, the width of the second region 22 may be 0.5mm, 0.6mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 9.8mm, 9.9mm or 10mm, etc. in the radial direction of the cell body 11.

In one embodiment, the ratio of the width of the first region 21 to the width of the second region 22 in the radial direction of the cell body 11 is 2-10, i.e., for example, the width of the first region 21 is x and the width of the second region 22 is y, 2+.x/y+.10 in the radial direction of the cell body 11, so that the first region 21 can be ensured to have a reliable width, thereby facilitating the formation of a weld with the first tab region 12, and a reliable overcurrent area between the first region 21 and the first tab region 12 can be ensured.

As shown in fig. 4, the radial direction of the cell body 11 may be denoted as a, the radial direction of the cell body 11 is infinite, only six radial directions of the cell bodies 11 are shown in the drawing, that is, the radial directions of the cell bodies 11 all need to pass through the center point of the cell body 11, the cell body 11 is a cylinder, and the center point of the cylinder diffuses toward the circumferential outer surface of the cell body 11, so that the radial direction a of the cell body 11 is formed, for example, the first area 21 is in a fan-shaped structure, at this time, in the radial direction of the cell body 11, the width of the first area 21 may be regarded as the length dimension of one circumferential outer edge of the fan-shaped structure, and correspondingly, in the radial direction of the cell body 11, the width of the second area 22 may be regarded as the distance value between the inner surface and the outer surface of the ring-shaped structure.

The ratio of the width of the first region 21 to the width of the second region 22 in the radial direction of the cell body 11 may be 2, 2.1, 2.2, 2.3, 2.5, 3, 3.5, 3.6, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 9.8, 9.9 or 10, etc.

In one embodiment, as shown in fig. 3 and 4, the first current collector 20 further includes a fifth region 23, and the fifth region 23 connects the first region 21 and the second region 22, so that the connection of the first region 21 and the second region 22 can be facilitated, and the overall area of the first current collector 20 can be increased, which can increase the current passing capability of the first current collector 20 to some extent.

The included angle between the fifth region 23 and the first region 21 is 0-180 °, the included angle between the fifth region 23 and the second region 22 is 0-180 °, for example, when the included angle between the fifth region 23 and the first region 21 is 0 or 180 °, and the included angle between the fifth region 23 and the second region 22 is 0 or 180 °, the first region 21, the fifth region 23, and the second region 22 may be sequentially disposed along the radial direction of the cell main body 11; alternatively, when the angle between the fifth region 23 and the first region 21 is 90 ° and the angle between the fifth region 23 and the second region 22 is 90 °, the first region 21, the fifth region 23, and the second region 22 may be sequentially disposed along the axial direction of the cell main body 11.

In one embodiment, the first region 21 and the second region 22 are not in the same plane in the height direction of the cylindrical battery, i.e., the first region 21 and the second region 22 may have a height difference therebetween, so that it is convenient that the first region 21 and the second region 22 are respectively used to connect the first tab region 12 and the battery case 40, thereby reasonably arranging the respective structural positions of the cylindrical battery.

As shown in connection with fig. 3 and 4, the angle between the fifth region 23 and the first region 21 may be 90 °, and the angle between the fifth region 23 and the second region 22 may be 90 °, the first region 21 and the second region 22 forming a height difference, and the width of the fifth region 23 may be regarded as the height difference between the first region 21 and the second region 22.

Of course, when the included angle between the fifth region 23 and the first region 21 is not 0, 90 ° or 180 °, and the included angle between the fifth region 23 and the second region 22 is not 0, 90 ° or 180 °, there is a height difference between the first region 21 and the second region 22, but the height difference is smaller than the width of the fifth region 23.

In one embodiment, the width of the fifth region 23 is less than or equal to 5mm in the radial direction of the cell main body 11, so that it is possible to avoid increasing the distance between the first region 21 and the second region 22 in the radial direction of the cell main body 11 when the width of the fifth region 23 is excessively large, thereby adversely affecting the connection of the first current collector 20 with the first tab region 12 and the battery case 40.

The width of the fifth region 23 is 5mm or less in the radial direction of the cell body 11, for example, the angle between the first region 21 and the fifth region 23 is 0, the angle between the second region 22 and the fifth region 23 is 0, and at this time, the width of the fifth region 23 in the radial direction of the cell body 11 can be regarded as the distance between the opposite ends of the fifth region 23; alternatively, the angle between the first region 21 and the fifth region 23 is 90 °, the angle between the second region 22 and the fifth region 23 is 90 °, and the width of the fifth region 23 in the radial direction of the cell main body 11 may be regarded as the thickness of the fifth region 23.

The included angle between the first region 21 and the fifth region 23 is an acute angle, and the included angle between the second region 22 and the fifth region 23 is an acute angle, and at this time, the width of the fifth region 23 in the radial direction of the cell main body 11 may be regarded as the perpendicular distance between the opposite ends of the fifth region 23 in the radial direction of the cell main body 11.

As shown in fig. 3 and 4, the angle between the first region 21 and the fifth region 23 may be 0, the angle between the second region 22 and the fifth region 23 may be 90 °, at this time, the cross section of the fifth region 23 may be considered as an L-like shape, and the width of the fifth region 23 may be considered as the width of the horizontal segment in the L-like shape along the radial direction of the cell body 11, that is, the vertical distance between the first region 21 and the second region 22 along the radial direction of the cell body 11 is the width of the fifth region 23.

In view of the connection requirement of the first current collector 20 and the convenience of manufacturing the first current collector 20, the first region 21 of the first current collector 20 may be a fan-shaped structure, the second region 22 of the first current collector 20 may be a circular ring structure, and the fifth region 23 of the first current collector 20 may be an L-shaped structure, the width of the first region 21 may be regarded as a distance value between an inner surface and an outer surface of the circular ring structure in a radial direction of the cell main body 11, the width of the second region 22 may be regarded as a length dimension of one circumferential outer edge of the fan-shaped structure, and the width of the fifth region 23 may be regarded as a width dimension of a horizontal segment of the L-shaped structure.

In one embodiment, the battery case 40 is a steel case, the first tab region 12 is a negative electrode tab, the first current collector 20 is electrically connected to the battery case 40, and the negative electrode tab is electrically connected to the steel case, and the corrosion potential of the steel case is higher than that of the cylindrical battery, so that the problem of electrochemical corrosion of the steel case can be avoided, for example, ions in the electrolyte can be prevented from being embedded into the lattice of the steel case.

The second tab region 13 is a positive electrode tab, and the first current collector 20 is disposed in an insulating manner with respect to the second tab region 13, for example, the first current collector 20 is disposed in a spaced manner with respect to the second tab region 13, so as to ensure insulation capability between the first current collector 20 and the second tab region 13. The first current collector 20 and the second tab region 13 may have an insulating structure therebetween, or the first current collector 20 and the second tab region 13 may be air-isolated therebetween.

Correspondingly, the first tab area 12 and the second current collector 30 are arranged in an insulating manner, the first tab area 12 and the second current collector 30 are arranged at intervals, and an insulating structure can be arranged between the first tab area 12 and the second current collector 30, or air isolation can be arranged between the first tab area 12 and the second current collector 30.

In one embodiment, the orthographic projection of the end surface of the second region 22, which is led out of the first tab region 12 toward the battery core main body 11, coincides with at least a portion of the first tab region 12, that is, the area of at least one of the second region 22 and the first tab region 12 is relatively larger, so that not only the overcurrent area can be increased, the service performance of the battery can be ensured, but also the risk that the first tab region 12 overlaps with the second current collector 30 can be avoided, thereby improving the safe service performance of the battery.

The orthographic projection of the end surface of the second region 22, which is led out of the first tab region 12 toward the battery core main body 11, coincides with the first tab region 12, for example, the area of the first tab region 12 may be relatively large, at this time, the overcurrent capability of the first tab region 12 may be improved, and the second region 22 may form protection for the first tab region 12 in the height direction, so that the false contact between the first tab region 12 and the second current collector 30 may be avoided to a certain extent.

In one embodiment, the core main body 11 is formed with a central hole 111, and the first tab area 12 is formed by folding and connecting a plurality of single tabs along the radial direction of the central hole 111, and the height of the single tab farthest from the central hole 111 is not smaller than the width of the second area 22 along the radial direction of the core main body 11, so that when the single tab is folded, the single tab farthest from the central hole 111 can be folded to the first area 21, thereby forming a reliable connection with the first area 21, and the welding capability between the first area 21 and the first tab area 12 is improved.

It should be noted that, when the first tab area 12 is formed by folding a plurality of single tabs, that is, after the battery core 10 is formed by winding, a certain gap is formed between the plurality of single tabs, at this time, the plurality of single tabs need to be folded, for example, the plurality of single tabs need to be folded in a direction close to the central hole 111, at this time, the first area 21 is located inside the second area 22, if the height of the single tab farthest from the central hole 111 of the plurality of single tabs is smaller than the width of the second area 22 in the radial direction of the battery core main body 11, after the furling of the farthest single tab in the direction towards the central hole 111, there is a possibility that the farthest single tab cannot reach below the first area 21, so that welding cannot be formed with the first area 21, and therefore, the overcurrent capability between the first tab area 12 and the first area 21 may be reduced.

In one embodiment, the height of the single tab furthest from the central hole 111 is greater than the width of the second region 22, so as to enable the furthest single tab to be folded and then positioned below the first region 21, thereby ensuring that a sufficient overcurrent area can be provided between the first tab region 12 and the first region 21.

In one embodiment, the difference between the height of the single tab furthest from the central hole 111 and the width of the second region 22 is 0.1mm-4.5mm, so that the furthest single tab can be guaranteed to be positioned below the first region 21 after being folded, thereby guaranteeing that a sufficient overcurrent area can be provided between the first tab region 12 and the first region 21, and avoiding the problem that the height of the single tab is too large, thereby guaranteeing the capacity density of the battery.

The difference between the height of the individual tab farthest from the center hole 111 and the width of the second region 22 may be 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm, 4.2mm, 4.3mm, 4.4mm, or 4.5mm, etc.

It should be noted that the height of the single tab is the height of the single tab extending from the length direction of the battery core main body 11, for example, after each single tab is straightened.

In one embodiment, the core body 11 is formed with a central hole 111, the number of the first tab areas 12 is plural, the number of the second tab areas 13 is plural, the plurality of the first tab areas 12 and the plurality of the second tab areas 13 can be arranged at intervals along the circumferential direction of the central hole 111, and on the basis of ensuring the insulation gap between the first tab areas 12 and the second tab areas 13, the first tab areas 12 and the second tab areas 13 can have enough overcurrent area.

As shown in fig. 6, the first tab area 12 is plural, the second tab area 13 is plural, and the first tab area 12 and the second tab area 13 may be staggered along the circumferential direction of the central hole 111.

Alternatively, the first tab area 12 may be plural, the second tab area 13 may be plural, the plural first tab areas 12 may be disposed adjacent to each other in order, and the plural second tab areas 13 may be disposed adjacent to each other in order.

In one embodiment, the distance between the first tab area 12 and the second tab area 13 is 2mm-15mm, so that the overcurrent area of the first tab area 12 and the second tab area 13 is relatively large while ensuring that a safe electrical distance can be provided between the first tab area 12 and the second tab area 13.

The separation distance between the first tab region 12 and the second tab region 13 may be 2mm, 2.1mm, 2.2mm, 2.5mm, 2.8mm, 2.9mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 5.8mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.9mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 11.8mm, 11.9mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 14.8mm, 14.9mm, 15mm, or the like.

In one embodiment, as shown in fig. 6, a spacing area 14 is formed between the first tab area 12 and the second tab area 13, the spacing area 14 is in a sector shape, the arc degree of the sector shape is pi/12-pi/2, so that not only the insulation capability between the first tab area 12 and the second tab area 13 can be reliably controlled, but also the overlarge gap between the first tab area 12 and the second tab area 13 can be avoided, thereby ensuring that the first tab area 12 and the second tab area 13 can have reasonable overcurrent area, and improving the safe service performance of the battery.

The arc degree of the sector may be pi/12, pi/11, pi/10, pi/8, pi/7, pi/6, pi/5, pi/4, pi/3, pi/2, etc.

In one embodiment, the core body 11 is formed with a central hole 111, the first tab area 12 may be one, and the second tab area 13 may be one, which is not only simple in structure, but also can ensure that the first tab area 12 and the second tab area 13 can have reliable overcurrent capability on the basis of ensuring an insulation gap between the first tab area 12 and the second tab area 13.

As shown in fig. 7, the first tab area 12 and the second tab area 13 are disposed at intervals along the circumferential direction of the central hole 111, where the first tab area 12 and the second tab area 13 are symmetrically disposed, so that not only can the first tab area 12 and the second tab area 13 be ensured to have reliable overcurrent capability, but also the risk of internal short circuit of the battery caused by overlapping between the first tab area 12 and the second tab area 13 can be avoided.

Referring to fig. 8, the first tab area 12 and the second tab area 13 are disposed at intervals along the radial direction of the central hole 111, so that not only the insulation capability between the first tab area 12 and the second tab area 13 can be reliably controlled, but also multiple cutting of the first tab area 12 and the second tab area 13 is avoided, and the forming of the first tab area 12 and the second tab area 13 is easier.

The cylindrical battery includes an electric core and an electrolyte, and is capable of performing a minimum unit of electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

The cylindrical battery can be a winding type battery, namely, a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

The battery cell comprises more than two pole pieces, the pole lugs comprise more than two single-piece pole lugs, the single-piece pole lugs extend out from the pole pieces corresponding to the single-piece pole lugs respectively, the width of each single-piece pole lug can be smaller than that of each pole piece, and a plurality of single-piece pole lugs are stacked to form the pole lugs. Wherein the single tab is made of a metal foil having good electrical and thermal conductivity, such as aluminum, copper, or nickel.

An embodiment of the present utility model also provides a battery pack including the above cylindrical battery.

The cylindrical battery of the battery pack according to an embodiment of the present utility model includes the battery cell 10 and the first current collector 20, the battery cell 10 includes the battery cell main body 11, the first tab area 12 and the second tab area 13 with opposite polarities extend from the same end of the battery cell main body 11, so that the space occupation rate of the battery cell 10 can be reduced, the space utilization rate of the cylindrical battery can be improved to a certain extent, the first current collector 20 includes the first area 21 and the second area 22, the first area 21 is welded with the first tab area 12, the orthographic projection of the end surface of the second area 22, which is led out of the second tab area 13 toward the battery cell main body 11, is overlapped with the second tab area 13, that is, the area of the second area 22, which is not welded with the first tab area 12, can be relatively larger, so that the overcurrent area of the first current collector 20 can be increased, and when the second area 22 is connected with the electrode assembly or the battery case, the space utilization rate of the cylindrical battery can be improved to a certain extent, and when the cylindrical battery cells are grouped, the battery cells can also be quickly transmitted to adjacent cylindrical batteries, so that the battery pack can be improved.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of cylindrical batteries, and the battery module can also include the bracket, and the battery can be fixed in on the bracket.

The battery pack comprises a plurality of cylindrical batteries and a box body, wherein the box body is used for fixing the plurality of cylindrical batteries.

It should be noted that, the battery pack includes a plurality of cylindrical batteries, and the plurality of cylindrical batteries are disposed in the case. Wherein, a plurality of cylinder batteries can be installed in the box after forming the battery module. Or, a plurality of cylindrical batteries can be directly arranged in the box body, namely, the plurality of cylindrical batteries do not need to be grouped, and the plurality of cylindrical batteries are fixed by the box body.

In one embodiment, as shown in fig. 9, the battery pack further includes a first bus bar 60 and a second bus bar 70, and the first bus bar 60 and the second bus bar 70 connect the battery case 40 of the cylindrical battery and the post assembly 50, respectively, so that the cylindrical battery can be used to form an electrical connection with other cylindrical batteries through the first bus bar 60 and the second bus bar 70, thereby grouping the cylindrical batteries.

In one embodiment, as shown in fig. 9, the first bus bar 60 and the second bus bar 70 are located at the same side of the battery case 40, and further, the first bus bar 60 is connected to the end surface of the battery case 40 where the post assembly 50 is provided, so that the space utilization of the cylindrical batteries can be improved and the grouping of the cylindrical batteries can also be facilitated.

In one embodiment, the first and second buss bars 60, 70 may be located on opposite sides of the battery housing 40 to accommodate the mounting and spatial arrangement of the cylindrical batteries.

In one embodiment, the plurality of cylindrical batteries may be electrically connected by the first bus bar 60 and the second bus bar 70, for example, when the plurality of cylindrical batteries may be connected in series, the first bus bar 60 may be connected with the post assembly 50 of the first cylindrical battery and with the battery case 40 of the second cylindrical battery, while the second bus bar 70 may be connected with the battery case of the first cylindrical battery and the second bus bar 70 may be connected with the post assembly 50 of the third cylindrical battery.

The first bus bar 60 may be welded to the battery case 40 of the cylindrical battery, and the second bus bar 70 may be welded to the post assembly 50 of the cylindrical battery.

In one embodiment, the first bus bar 60 is welded to the battery case 40, and the first current collector 20 is welded to the battery case 40, thereby securing the connection strength of the first bus bar 60 and the battery case 40, and the connection strength of the first current collector 20 and the battery case 40.

The welding marks formed by welding the first bus bar 60 and the battery shell 40 and the welding marks formed by welding the first current collector 20 and the battery shell 40 are not overlapped with each other in the orthographic projection on the plane of the end face of the battery cell main body 11, where the second lug area 13 is led out, i.e. the welding position of the first bus bar 60 and the battery shell 40 and the welding position of the first current collector 20 and the battery shell 40 are not overlapped, the battery shell 40 can comprise two welding areas, one welding area is welded with the first bus bar 60, and the other welding area is welded with the first current collector 20, so that structural damage to the battery shell 40 in the welding process can be effectively avoided, and after all, the problem of welding breakdown is easy to cause if the same position is welded for the second time.

It should be noted that, as shown in fig. 9, a first bus bar 60 and a second bus bar 70 may be connected to one cylindrical battery, where the first bus bar 60 may be connected to the battery case 40 of the cylindrical battery, and the second bus bar 70 may be connected to the post assembly 50 of the cylindrical battery.

The first bus bar 60 and the second bus bar 70 may each include a post connection portion for connecting the post assembly 50 of one cylindrical battery and a cylindrical battery case connection portion for connecting the battery case 40 of the other cylindrical battery. The first bus bar 60 or the second bus bar 70 may be used for only two cylindrical batteries, or the first bus bar 60 and the second bus bar 70 may be used for connecting more than two cylindrical batteries, which is not limited herein and may be selected according to actual requirements.

The number of the bus bars and the specific structure are not limited, and may be selected according to actual requirements, and accordingly, the number of the cylindrical batteries is not limited, and the plurality of cylindrical batteries may be connected in parallel, or the plurality of cylindrical batteries may be connected in series.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A cylindrical battery, comprising:

the battery cell (10), the battery cell (10) comprises a battery cell main body (11), a first tab area (12) and a second tab area (13), wherein the first tab area (12) and the second tab area (13) with opposite polarities extend from the same end of the battery cell main body (11);

the first current collector (20), first current collector (20) include first region (21) and second region (22), first region (21) with first utmost point ear district (12) welding, second region (22) are drawn forth towards electric core main part (11) the orthographic projection of terminal surface in second utmost point ear district (13) with at least part in second utmost point ear district (13) coincides.

2. The cylindrical battery according to claim 1, further comprising a second current collector (30), the second current collector (30) being electrically connected with the second tab region (13).

3. The cylindrical battery according to claim 2, characterized in that the second current collector (30) comprises a third region (31) and a fourth region (32), the third region (31) being welded to the second tab region (13).

4. A cylindrical battery according to claim 3, characterized in that the orthographic projection of the fourth region (32) towards the cell body (11) leading out of the end face of the second tab region (13) coincides with the second tab region (13) and/or that the orthographic projection of the fourth region (32) towards the cell body (11) leading out of the end face of the first tab region (12) coincides with at least part of the first tab region (12).

5. The cylindrical battery according to claim 2, further comprising a battery housing (40) and a post assembly (50), the post assembly (50) being disposed on the battery housing (40), one of the first current collector (20) and the second current collector (30) being electrically connected to the battery housing (40) and the other being electrically connected to the post assembly (50).

6. The cylindrical battery according to claim 5, wherein the second current collector (30) includes a third region (31) and a fourth region (32), the third region (31) being welded to the second tab region (13), the fourth region (32) being welded to the post assembly (50), the post assembly (50) being disposed at a central position of the battery case (40).

7. The cylindrical battery according to claim 5, wherein the battery case (40) is a steel case, the first tab region (12) is a negative electrode tab, and the first current collector (20) is electrically connected to the battery case (40);

the second lug area (13) is a positive electrode lug.

8. The cylindrical battery according to any one of claims 1 to 7, wherein the first current collector (20) is a current collecting disc, and at least part of the second region (22) is arranged around the periphery of the first region (21).

9. Cylindrical battery according to claim 8, characterized in that the width of the second region (22) in the radial direction of the cell body (11) is 0.5mm-10mm.

10. Cylindrical battery according to claim 9, characterized in that the ratio of the width of the first region (21) to the width of the second region (22) in the radial direction of the cell body (11) is 2-10.

11. The cylindrical battery according to any one of claims 1 to 7, wherein the first current collector (20) further comprises a fifth region (23), the fifth region (23) connecting the first region (21) and the second region (22), an angle between the fifth region (23) and the first region (21) being 0-180 °, and an angle between the fifth region (23) and the second region (22) being 0-180 °.

12. The cylindrical battery according to claim 11, wherein the first region (21) and the second region (22) are not in the same plane in the height direction of the cylindrical battery.

13. The cylindrical battery according to claim 11, characterized in that the width of the fifth region (23) is 5mm or less in the radial direction of the cell body (11).

14. The cylindrical battery according to any one of claims 1 to 7, characterized in that an orthographic projection of the second region (22) out of the end face of the first tab region (12) toward the cell body (11) coincides with at least part of the first tab region (12).

15. The cylindrical battery according to any one of claims 1 to 7, wherein the cell main body (11) is formed with a center hole (111), and the first tab region (12) is formed by folding and connecting a plurality of single tabs in a radial direction of the center hole (111), and a height of a single tab of the plurality of single tabs farthest from the center hole (111) is not smaller than a width of the second region (22) in the radial direction of the cell main body (11).

16. The cylindrical battery according to claim 15, wherein a height of a plurality of the single tab farthest from the center hole (111) is larger than a width of the second region (22);

Wherein the difference between the height of the single tab furthest from the central hole (111) and the width of the second region (22) is 0.1mm-4.5mm.

17. The cylindrical battery according to any one of claims 1 to 7, wherein a central hole (111) is formed in the cell main body (11), the first tab regions (12) are plural, the second tab regions (13) are plural, and the first tab regions (12) and the second tab regions (13) are staggered in the circumferential direction of the central hole (111).

18. The cylindrical battery according to claim 17, wherein a separation distance between the first tab region (12) and the second tab region (13) is 2mm-15mm.

19. The cylindrical battery according to claim 17, wherein a spacing region (14) is formed between the first tab region (12) and the second tab region (13), the spacing region (14) being a sector shape having an arc degree of pi/12-pi/2.

20. The cylindrical battery according to any one of claims 1 to 7, wherein the cell main body (11) has a center hole (111) formed thereon;

the first tab area (12) and the second tab area (13) are arranged at intervals along the circumferential direction of the central hole (111), and the first tab area (12) and the second tab area (13) are symmetrically arranged; alternatively, the first tab region (12) and the second tab region (13) are disposed at intervals along the radial direction of the center hole (111).

21. A battery comprising the cylindrical battery of any one of claims 1 to 20.

22. The battery of claim 21, further comprising a first bus bar (60) and a second bus bar (70), the first bus bar (60) and the second bus bar (70) connecting the battery housing (40) and the post assembly (50) of the cylindrical battery, respectively;

wherein the first busbar (60) is connected to an end face of the battery case (40) where the pole assembly (50) is provided.

23. The battery pack according to claim 22, wherein the first busbar (60) is welded to the battery case (40), the first current collector (20) is welded to the battery case (40), and the welding mark formed by welding the first busbar (60) to the battery case (40) is not coincident with the orthographic projection of the welding mark formed by welding the first current collector (20) to the battery case (40) on the plane on which the end face of the second tab region (13) is led out toward the battery cell main body (11).