CN219371128U - Cylindrical battery - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a cylindrical battery, which comprises: a battery case; the battery cell is arranged in the battery shell and comprises a battery cell main body and a first tab extending from one end of the battery cell main body, and the first tab is in heat conduction connection with the battery shell; the height of the battery cell is a, the dimension of the first tab along the height direction of the battery cell 20 is b, b/a=0.004-0.2, the diameter of the battery cell is more than or equal to 40mm, and more heat is generated in the battery cell, so that the first tab is in heat conduction connection with the battery shell, the heat rapid transfer between the battery cell and the battery shell can be improved, and the safe use performance of the cylindrical battery is improved.

Description

Cylindrical battery

Technical Field

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

Background

In the related art, a large amount of heat can be generated in the use process of the battery, if the heat cannot be timely dissipated, safety problems can be caused, and particularly, under the condition of larger battery size, the heat dissipation problem is more remarkable.

Disclosure of Invention

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

The present utility model provides a cylindrical battery comprising:

a battery case;

the battery cell is arranged in the battery shell and comprises a battery cell main body and a first tab extending from one end of the battery cell main body, and the first tab is in heat conduction connection with the battery shell;

the height of the battery cell is a, the dimension of the first tab along the height direction of the battery cell is b, b/a=0.004-0.2, and the diameter of the battery cell is more than or equal to 40mm.

The cylindrical battery provided by the embodiment of the utility model comprises the battery shell and the battery core, wherein the battery core is arranged in the battery shell, so that the battery shell can form the protection of the battery core, and the battery shell can be used for realizing heat dissipation of the battery core. The battery cell comprises a battery cell main body and a first tab extending from one end of the battery cell main body, and the first tab is in heat conduction connection with the battery shell, so that the battery cell main body can transmit heat to the battery shell through the first tab, and the heat dissipation capacity of the battery cell is improved. The height of the battery cell is a, the dimension of the first tab along the height direction of the battery cell is b, b/a=0.004-0.2, the diameter of the battery cell is more than or equal to 40mm, and more heat is generated in the battery cell, so that the first tab is in heat conduction connection with the battery shell, the heat rapid transfer between the battery cell and the battery shell can be improved, and the safe service performance of the cylindrical battery 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 battery according to an exemplary embodiment;

fig. 2 is a schematic structural view of a battery cell of a battery according to a first exemplary embodiment;

fig. 3 is a schematic structural view of a battery cell of a battery according to a second exemplary embodiment;

fig. 4 is a schematic structural view of a battery cell of a battery according to a third exemplary embodiment;

fig. 5 is a schematic view illustrating a structure of a battery according to another exemplary embodiment.

The reference numerals are explained as follows:

10. a battery case; 20. a battery cell; 21. a cell body; 22. a first tab; 23. a second lug; 24. a third ear; 30. a pole assembly; 40. a first conductive bar; 50. and a second conductive 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 5, including: a battery case 10; the battery cell 20 is arranged in the battery shell 10, the battery cell 20 comprises a battery cell main body 21 and a first tab 22 extending from one end of the battery cell main body 21, and the first tab 22 is in heat conduction connection with the battery shell 10; the height of the battery cell 20 is a, the dimension of the first tab 22 along the height direction of the battery cell 20 is b, the dimension of b/a=along the height direction of the battery cell 20 is b, and the diameter of the battery cell 20 is equal to or larger than 40mm, wherein b/a=0.004-0.2.

The cylindrical battery of one embodiment of the present utility model includes a battery case 10 and a battery cell 20, and the battery cell 20 is disposed within the battery case 10, so that the battery case 10 can form protection for the battery cell 20, and the battery case 10 can be used to realize heat dissipation of the battery cell 20. The battery cell 20 includes a battery cell main body 21 and a first tab 22 extending from one end of the battery cell main body 21, where the first tab 22 is in heat-conducting connection with the battery case 10, so that the battery cell main body 21 can transmit heat to the battery case 10 through the first tab 22, and the heat dissipation capability of the battery cell 20 is improved. The height of the battery cell 20 is a, the dimension of the first tab 22 along the height direction of the battery cell 20 is b, b/a=0.004-0.2, the diameter of the battery cell 20 is larger than or equal to 40mm, and more heat is generated in the battery cell 20, so that the first tab 22 is in heat conduction connection with the battery shell 10, the heat rapid transfer between the battery cell 20 and the battery shell 10 can be improved, and the safe service performance of the cylindrical battery is improved.

It should be noted that, as the size of the cylindrical battery is large, that is, when the diameter of the battery cell 20 is greater than or equal to 40mm, the heat is quickly transferred through the heat conduction connection between the first tab 22 and the battery case 10, so that the risk of the cylindrical battery being caused by the low heat dissipation rate of the battery cell 20 due to the too small height of the first tab 22 is avoided by making the ratio between the dimension b of the first tab 22 along the height direction of the battery cell 20 and the height a of the battery cell 20 be 0.004-0.2; the first tab 22 is too high, resulting in a lower overall energy density of the cylindrical battery and reduced utilization of the internal space of the cylindrical battery.

As shown in fig. 2, the height of the battery cell 20 is the overall height of the battery cell 20, that is, the overall height of the battery cell body 21 and the tab extending therefrom, for example, the tab includes a first tab 22 and a second tab 23, the first tab 22 and the second tab 23 extend from opposite ends of the battery cell body 21, and at this time, the height of the battery cell 20 is the sum of the height of the battery cell body 21, the height of the first tab 22 and the height of the second tab 23.

The height of the battery cell 20 is denoted as a, the dimension of the first tab 22 along the height direction of the battery cell 20 is denoted as b, the dimension of the first tab 22 along the height direction of the battery cell 20 may be considered as the height of the first tab 22 after the first tab 22 is folded and connected, for example, the first tab 22 is formed by folding and connecting multiple layers of empty foil areas, the dimension b of the first tab 22 along the height direction of the battery cell 20 after the folding and connecting multiple layers of empty foil areas is the distance between the end of the first tab 22 connected with the battery cell main body 21 and the side of the first tab 22 separated from the battery cell main body 21, and the dimension b of the first tab 22 along the height direction of the battery cell 20 may be the maximum dimension of the first tab 22 along the height direction of the battery cell 20.

The first tab 22 is thermally connected to the battery case 10, and at this time, the first tab 22 may be in direct contact with the battery case 10, or the first tab 22 may be in indirect contact with the battery case 10, for example, the first tab 22 may be in contact with the battery case 10 through a thermal conductive adhesive.

In the related art, when the battery cell 20 is molded, the pole piece may be made to include a portion of the empty foil region, which may be used for heat conduction connection with the battery case 10, along the winding direction of the battery cell 20. In this embodiment, in the height direction of the battery cell 20, the empty foil area, i.e., the first tab 22, is formed on the pole piece, and the first tab 22 is in heat conduction connection with the battery case 10, so as to achieve heat dissipation.

In one embodiment, the diameter of the cells 20 may range from 40mm to 80mm, for example, the diameter of the cells 20 may be 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, or the like.

In one embodiment, the ratio between the dimension b of the first tab 22 along the height direction of the battery cell 20 and the height a of the battery cell 20 may be 0.006-0.07, i.e. b/a=0.006-0.07, so that the heat dissipation rate of the battery cell 20 is ensured, and meanwhile, the overall energy density of the cylindrical battery can be improved, and the internal space utilization of the cylindrical battery can also be ensured.

In one embodiment, the ratio between the dimension b of the first tab 22 along the height direction of the cell 20 and the height a of the cell 20 may be 0.004, 0.005, 0.006, 0.007, 0.01, 0.02, 0.05, 0.06, 0.07, 0.08, 0.1, 0.15, 0.18, 0.19, or 0.2, etc.

In one embodiment, the dimension of the first tab 22 along the height direction of the battery core 20 is b, and b is 0.5mm less than or equal to 10mm, so that the dimension of the first tab 22 along the height direction can be effectively controlled, the heat dissipation capacity of the first tab 22 is ensured, and the problem that the material waste is caused by the oversized dimension of the first tab 22 along the height direction and the problem that the space utilization rate and the energy density are not improved is avoided.

The dimension of the first tab 22 along the height direction of the cell 20 may be 0.5mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 8mm, 9mm, 10mm, or the like.

In one embodiment, the first tab 22 is electrically connected to the battery case 10, so that on the basis of enabling the first tab 22 to realize heat conduction and transmission, the battery case 10 can also be used as an electrode lead-out structure of a battery to realize rapid current transmission through rapid heat dissipation of the battery case 10.

In one embodiment, the first tab 22 is in direct contact with the battery case 10, which not only reduces the number of structures of the cylindrical battery, but also facilitates the electrical connection between the first tab 22 and the battery case 10, and further shortens the heat transfer path between the first tab 22 and the battery case 10.

In one embodiment, the first tab 22 may be indirectly contacted with the battery case 10, for example, the first tab 22 may be contacted with the battery case 10 through conductive paste, whereby the electrical connection of the first tab 22 with the battery case 10 may also be achieved, or the first tab 22 may be electrically connected with the battery case 10 through a tab.

In one embodiment, the first tab 22 includes an empty foil region led out by the pole piece of the battery cell 20, and the thickness of the empty foil region ranges from 4 μm to 15 μm, so that not only the structural strength of the first tab 22 can be ensured, but also the overcurrent capability of the first tab 22 can be ensured, thereby ensuring the service performance of the cylindrical battery.

The first tab 22 includes a hollow foil area led out from the pole piece of the battery cell 20, that is, a portion of the pole piece coated with the active material is used to form the battery cell main body 21, and the first tab 22 is formed from a hollow foil area not coated with the active material, for example, the hollow foil area is copper foil, the first tab 22 may be a full tab, that is, the hollow foil area is a complete structure, a multi-layer structure is formed after winding and forming, and the multi-layer structure is folded and connected to form the first tab 22, where the thickness of the hollow foil area ranges from 4 μm to 15 μm, and may also be used to control the energy density of the battery cell main body 21 to a certain extent. Of course, the first tab 22 may be a non-full tab, i.e. an integral empty foil area is separated, and the first tab 22 is formed by winding and shaping and then folding and connecting, but the thickness of the empty foil area is easily available.

The thickness of the empty foil region may be 4 μm, 4.5 μm, 5 μm, 6 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, 11 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm or 15 μm, etc.

In one embodiment, the first tab 22 is a negative electrode tab, the battery case 10 is a steel case, the negative electrode tab is electrically connected with 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.

In one embodiment, the first tab 22 is a negative tab, the first tab 22 includes an empty foil area led out by the pole piece of the battery cell 20, and the thickness of the empty foil area ranges from 4 μm to 8 μm, i.e. the thickness of the empty foil area of the negative tab can be relatively smaller, so that the energy density of the battery cell 20 can be ensured on the basis of meeting the heat dissipation requirement of the first tab 22.

The empty foil region of the negative electrode tab may be a copper foil, for example, on which a positive electrode active material is coated, thereby serving to form a part of the cell main body 21.

In one embodiment, the first tab 22 is a positive tab, the battery case 10 is an aluminum case, and the positive tab is electrically connected to the aluminum case, and the corrosion potential of the aluminum case is higher than that of the cylindrical battery, so that the problem of electrochemical corrosion of the aluminum case can be avoided.

In one embodiment, the first tab 22 is a positive electrode tab, the first tab 22 includes an empty foil area led out by the pole piece of the battery cell 20, and the thickness of the empty foil area ranges from 10 μm to 15 μm, i.e. the thickness of the empty foil area of the positive electrode tab can be relatively larger, so that the structural strength of the first tab 22 can be ensured on the basis of meeting the heat dissipation requirement of the first tab 22.

The empty foil region of the positive electrode tab may be an aluminum foil, for example, on which a negative electrode active material is coated, thereby serving to form a part of the cell main body 21.

In one embodiment, as shown in fig. 2, the battery cell 20 further includes a second tab 23, the polarities of the first tab 22 and the second tab 23 are opposite, the first tab 22 and the second tab 23 extend from opposite ends of the battery cell main body 21, so that not only the electron transmission path is shortest, but also the transmission rate is fast, and the heat generation is low, thereby improving the safety performance of the battery.

As shown in fig. 2, the first tab 22 and the second tab 23 extend from opposite ends of the battery cell body 21, the first tab 22 and the second tab 23 may be two electrode terminals of the battery cell 20, the first tab 22 may be electrically connected to the battery case 10, and the second tab 23 may be electrically connected to another electrode terminal structure, for example, the second tab 23 may be electrically connected to the electrode post assembly.

In one embodiment, as shown in fig. 3, the battery cell 20 further includes a third tab 24, the polarity of the second tab 23 is opposite to that of the third tab 24, and the second tab 23 and the third tab 24 extend from the same end of the battery cell body 21; the third tab 24 is in thermal conductive connection with the battery case 10, so that the first tab 22 and the third tab 24 can simultaneously realize heat transfer of the battery cell 20, thereby improving heat dissipation capacity of the battery cell 20, ensuring that the cylindrical battery can realize rapid heat dissipation through the battery case 10, and improving safe service performance of the cylindrical battery.

In one embodiment, the third tab 24 is electrically connected with the battery case 10, so that the battery case 10 can be used as an electrode lead-out structure, and the heat dissipation capability of the battery case 10 can be ensured.

The third tab 24 may be in direct contact with the battery case 10, or the third tab 24 may be in indirect contact with the battery case 10, which is not limited herein.

It should be noted that the first tab 22 and the third tab 24 may have the same polarity, and the first tab 22 and the third tab 24 may be electrically connected to the battery case 10 at the same time, or one of the first tab 22 and the third tab 24 may be electrically connected to the battery case 10, and the other may be electrically connected to the battery case 10 in an insulating manner.

In one embodiment, the size of the first tab 22 led out from the battery cell main body 21 is larger than the size of the third tab 24 led out from the battery cell main body 21, so that the first tab 22 can have reliable heat dissipation capability, and the problem of oversized third tab 24 can be avoided.

The dimension of the first tab 22 drawn from the cell body 21 may be considered as the dimension measured after the blank foil area forming the first tab 22 is straightened, and correspondingly, the dimension of the third tab 24 drawn from the cell body 21 may be considered as the dimension measured after the blank foil area forming the third tab 24 is straightened. The first tab 22 needs to ensure reliable heat dissipation, and the third tab 24 can control the space occupancy rate on the basis of ensuring overcurrent, so as to improve the overall space utilization rate and energy density of the cylindrical battery.

In one embodiment, as shown in fig. 4, the battery cell 20 further includes a second tab 23, the polarities of the first tab 22 and the second tab 23 are opposite, the first tab 22 and the second tab 23 extend from the same end of the battery cell main body 21, and the first tab 22 and the second tab 23 are spaced apart, so as to ensure insulation between the first tab 22 and the second tab 23, and avoid a short circuit problem.

The polarities of the first tab 22 and the second tab 23 are opposite, one of the first tab 22 and the second tab 23 is a positive electrode tab, and the other is a negative electrode tab, and the first tab 22 and the second tab 23 extend from the same side of the battery cell main body 21, so that the problem of excessive accumulation of height space caused by the extension of the first tab 22 and the second tab 23 from the opposite sides of the battery cell main body 21 can be avoided.

It should be noted that, when the battery core 20 includes the first tab 22 and the second tab 23 with opposite polarities, at least one of the first tab 22 and the second tab 23 is electrically connected with the battery case 10, so that the battery case 10 can be used as an electrode lead-out end of a cylindrical battery, so that the subsequent grouping of the cylindrical battery is facilitated, and the number of components of the cylindrical battery can be reduced, thereby improving the service performance of the battery.

The battery case 10 may include a first portion and a second portion, which may be provided to be insulated, and one of the first tab 22 and the second tab 23 may be electrically connected to the first portion, and the other may be electrically connected to the second portion.

The first and second portions of the battery case 10 may be made of different materials, so as to prevent the problem of potential corrosion caused by connection of the first and second tabs 22 and 23 of the battery cell 20 with the battery case 10, for example, when the first and second tabs 22 and 23 are respectively a negative electrode tab and a positive electrode tab, the first and second portions may be made of a steel material and an aluminum material, respectively, and the first and second tabs 22 and 23 are electrically connected to the first and second portions, respectively.

In one embodiment, as shown in fig. 5, the cylindrical battery further includes a first conductive bar 40 and a second conductive bar 50 having opposite polarities, the first conductive bar 40 and the second conductive bar 50 are electrically connected with the battery cell 20, and the first conductive bar 40 and the second conductive bar 50 are located at the same side of the battery case 10, so that the space utilization of the cylindrical battery can be improved, and the grouping of the cylindrical battery can be also facilitated.

In one embodiment, the first conductive bar 40 and the second conductive bar 50 are located on one side of the battery case 10 facing the second tab 23, that is, when the first tab 22 and the second tab 23 extend from opposite ends of the battery cell body 21, the first tab 22 may face the bottom of the cylindrical battery, that is, the first tab 22 may extend from the bottom of the battery cell body 21, so that after the cylindrical battery cells are grouped, the first tab 22 may be enabled to quickly transfer heat to the battery case 10, and the battery case 10 may be enabled to quickly dissipate heat, thereby improving the heat dissipation capability of the cylindrical battery, and further improving the safety performance of the battery pack.

In one embodiment, as shown in fig. 1, the cylindrical battery further includes a post assembly 30, the post assembly 30 is disposed on the battery case 10, and the post assembly 30 is electrically connected with the second tab 23; wherein the first conductive bar 40 is electrically connected with the battery case 10, and the second conductive bar 50 is electrically connected with the post assembly 30, so that the cylindrical batteries can be made to electrically connect with other cylindrical batteries through the first conductive bar 40 and the second conductive bar 50, thereby grouping the cylindrical batteries.

It should be noted that the first conductive strip 40 and the second conductive strip 50 may be located on opposite sides of the battery case 10, so as to adapt to the installation mode and the spatial arrangement of the cylindrical batteries.

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 a battery case 10 and a battery cell 20, and the battery cell 20 is disposed within the battery case 10, so that the battery case 10 can form protection for the battery cell 20, and the battery case 10 can be used to realize heat dissipation of the battery cell 20. The battery cell 20 includes a battery cell main body 21 and a first tab 22 extending from one end of the battery cell main body 21, where the first tab 22 is in heat-conducting connection with the battery case 10, so that the battery cell main body 21 can transmit heat to the battery case 10 through the first tab 22, and the heat dissipation capability of the battery cell 20 is improved. The height of the battery cell 20 is a, the dimension of the first tab 22 along the height direction of the battery cell 20 is b, b/a=0.004-0.2, the diameter of the battery cell 20 is larger than or equal to 40mm, and more heat is generated in the battery cell 20, so that the first tab 22 is in heat conduction connection with the battery shell 10, the heat rapid transfer between the battery cell 20 and the battery shell 10 can be improved, and the safety use performance of the battery pack is 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.

The number of cylindrical batteries may be plural, the plurality of cylindrical batteries may form a battery pack, the plurality of cylindrical batteries may be electrically connected through the first conductive bar 40 and the second conductive bar 50, for example, when the plurality of cylindrical batteries may be connected in series, the first conductive bar 40 may be connected with the post assembly 30 of the first cylindrical battery and with the battery case 10 of the second cylindrical battery, while the second conductive bar 50 may be connected with the battery case of the first cylindrical battery, and the second conductive bar 50 may be connected with the post assembly 30 of the third cylindrical battery.

The first conductive strip 40 may be welded to the battery housing 10 of the cylindrical battery and the second conductive strip 50 may be welded to the post assembly 30 of the cylindrical battery.

The number of the conductive bars and the specific structure are not limited, and can be selected according to actual requirements, and correspondingly, the number of the cylindrical batteries is not limited, and the plurality of cylindrical batteries can be connected in parallel, or the plurality of cylindrical batteries can 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 (15)

1. A cylindrical battery, comprising:

a battery case (10);

the battery cell (20), the battery cell (20) is arranged in the battery shell (10), the battery cell (20) comprises a battery cell main body (21) and a first tab (22) extending from one end of the battery cell main body (21), and the first tab (22) is in heat conduction connection with the battery shell (10);

the height of the battery cell (20) is a, the dimension of the first tab (22) along the height direction of the battery cell (20) is b, b/a=0.004-0.2, and the diameter of the battery cell (20) is more than or equal to 40mm.

2. The cylindrical battery of claim 1, wherein b/a = 0.006-0.07.

3. The cylindrical battery according to claim 1, characterized in that the first tab (22) is electrically connected with the battery case (10).

4. A cylindrical battery according to claim 3, characterized in that the first tab (22) is in direct contact with the battery housing (10).

5. A cylindrical battery according to claim 3, characterized in that the first tab (22) comprises a hollow foil region leading from the pole piece of the cell (20), the hollow foil region having a thickness in the range of 4 μm-15 μm.

6. A cylindrical battery according to claim 3, wherein the first tab (22) is a negative tab and the battery case (10) is a steel case.

7. The cylindrical battery according to claim 6, characterized in that the first tab (22) comprises a hollow foil region leading from a pole piece of the cell (20), the hollow foil region having a thickness ranging from 4 μm to 8 μm.

8. A cylindrical battery according to claim 3, wherein the first tab (22) is a positive tab and the battery case (10) is an aluminum case.

9. The cylindrical battery according to claim 8, characterized in that the first tab (22) comprises a hollow foil region leading from a pole piece of the cell (20), the hollow foil region having a thickness ranging from 10 μm to 15 μm.

10. The cylindrical battery of claim 1, wherein 0.5 mm.ltoreq.b.ltoreq.10 mm.

11. The cylindrical battery according to any one of claims 1 to 10, wherein the cell (20) further comprises a second tab (23), the first tab (22) and the second tab (23) being of opposite polarity, the first tab (22) and the second tab (23) extending from opposite ends of the cell body (21).

12. The cylindrical battery according to claim 11, wherein the cell (20) further comprises a third tab (24), the second tab (23) being of opposite polarity to the third tab (24), the second tab (23) and the third tab (24) extending from the same end of the cell body (21);

wherein the third lug (24) is in heat-conducting connection with the battery housing (10).

13. The cylindrical battery according to claim 12, characterized in that the third tab (24) is electrically connected with the battery housing (10).

14. The cylindrical battery according to claim 12 or 13, characterized in that the dimension of the first tab (22) drawn from the cell body (21) is greater than the dimension of the third tab (24) drawn from the cell body (21).

15. The cylindrical battery according to any one of claims 1 to 10, wherein the cell (20) further comprises a second tab (23), the first tab (22) and the second tab (23) being of opposite polarity, the first tab (22) and the second tab (23) extending from the same end of the cell body (21).