CN220042220U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries and provides a battery, which comprises a cylindrical battery core, wherein the cylindrical battery core comprises a main body and a first tab led out from one side of the main body, the first tab comprises a plurality of single-piece tabs, the single-piece tabs are folded and bent to form the first tab, and a first area and a second area are formed on the single-piece tabs along the radial direction of the main body; at least one single tab of the first region includes a first portion and a second portion, the first portion is disposed toward the winding core Kong Wanshe, the second portion is disposed along a radial direction of the main body away from the winding core Kong Wanshe, and at least one single tab of the second region is disposed toward the winding core Kong Wanshe, so that the second portion forms top protection for a plurality of single tabs close to a winding core hole, when the first tab is welded, risk of welding energy striking the inside of the main body is reduced, meanwhile, current transmission speed is increased, overall power density of the battery is increased, and service performance of the battery is reliably improved.

Description

Battery cell

Technical Field

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

Background

In the related art, the tab of the cylindrical battery cell can be folded by bending, and the formed tab possibly affects the service performance of the battery due to the limitation of the folding and bending mode of the single tab, for example, when the tab is welded, the tab close to the center of the cylindrical battery cell is affected by the staggered layers of the tab, the overall thickness is thinner, and the welding process has the safety risks of welding through the cylindrical battery cell, causing internal short circuit of the battery and the like.

Disclosure of Invention

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

The utility model provides a battery, which comprises a cylindrical battery core, wherein the cylindrical battery core comprises a main body and a first tab led out from one side of the main body, a core winding hole is formed in the main body, the first tab comprises a plurality of single-piece tabs which are folded and bent to form a first tab along the radial direction of the main body, a first area and a second area are formed in the plurality of single-piece tabs along the radial direction of the main body, and the first area is positioned between the second area and the core winding hole;

wherein, at least one monolithic utmost point ear in first region includes first part and second part, and first part is connected with the bulk phase, and the second part is connected in the one end that the main part was kept away from to first part, and first part sets up towards rolling up core Kong Wanshe, and the second part is along the radial direction of main part setting of deviating from rolling up core Kong Wanshe, and at least one monolithic utmost point ear in second region is towards rolling up the core hole bending setting.

The battery comprises a cylindrical battery core, the cylindrical battery core comprises a main body and first electrode lugs, a winding core hole is formed in the main body, the first electrode lugs are formed by folding and bending a plurality of single-piece electrode lugs, the first electrode lugs comprise a first area and a second area along the radial direction of the main body, at least one single-piece electrode lug of the first area comprises a first part and a second part, the first part is arranged towards the winding core Kong Wanshe, the second part is arranged away from the winding core Kong Wanshe along the radial direction of the main body, therefore, the second part can form protection for the tops of the single-piece electrode lugs close to the winding core hole, the risk that welding energy is beaten into the main body when the first electrode lugs are welded can be reduced, meanwhile, the current transmission speed can be improved, the whole power density of the battery can be improved, and the service performance of the battery can be reliably 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 cross-sectional structure of a battery according to a first exemplary embodiment;

fig. 2 is a schematic cross-sectional structure of a battery according to a second exemplary embodiment;

fig. 3 is a schematic cross-sectional structure of a battery according to a third exemplary embodiment;

fig. 4 is a schematic cross-sectional structure of a battery according to a fourth exemplary embodiment.

The reference numerals are explained as follows:

10. a cylindrical cell; 11. a main body; 111. a winding core hole; 112. an end face; 12. a first tab; 121. a single tab; 1211. a first portion; 1212. a second portion; 122. a first region; 123. a second region; 124. a third region; 13. and a second lug.

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.

Referring to fig. 1 to 4, an embodiment of the present utility model provides a battery, where the battery includes a cylindrical battery core 10, the cylindrical battery core 10 includes a main body 11 and a first tab 12 led out from one side of the main body 11, the main body 11 is formed with a winding core hole 111, the first tab 12 includes a plurality of single-piece tabs 121 along a radial direction of the main body 11, the plurality of single-piece tabs 121 are folded and bent to form the first tab 12, a first region 122 and a second region 123 are formed on the plurality of single-piece tabs 121 along the radial direction of the main body 11, and the first region 122 is located between the second region 123 and the winding core hole 111; the at least one single tab 121 of the first area 122 includes a first portion 1211 and a second portion 1212, the first portion 1211 is connected to the main body 11, the second portion 1212 is connected to an end of the first portion 1211 away from the main body 11, the first portion 1211 is bent towards the winding core hole 111, the second portion 1212 is bent away from the winding core hole 111 along a radial direction of the main body 11, and the at least one single tab 121 of the second area 123 is bent towards the winding core hole 111.

The battery according to one embodiment of the utility model comprises a cylindrical battery core 10, the cylindrical battery core 10 comprises a main body 11 and a first tab 12, the main body 11 is provided with a winding core hole 111, the first tab 12 is formed by folding and bending a plurality of single-chip tabs 121, the first tab 12 comprises a first area 122 and a second area 123 along the radial direction of the main body 11, at least one single-chip tab 121 of the first area 122 comprises a first part 1211 and a second part 1212, the first part 1211 is bent towards the winding core hole 111, the second part 1212 is bent away from the winding core hole 111 along the radial direction of the main body 11, so that the second part 1212 forms a protection for the top of the plurality of single-chip tabs 121 close to the winding core hole 111, the risk that welding energy is beaten into the main body 11 when the first tab 12 is welded can be reduced, meanwhile, the current transmission speed can be increased, the whole power density of the battery can be increased, and the service performance of the battery can be reliably improved.

It should be noted that, the plurality of single tab 121 may be folded toward the direction close to the winding core hole 111 to form the first tab 12, and the plurality of single tab 121 is formed with the first area 122 and the second area 123 along the radial direction of the main body 11, at this time, the first area 122 is located between the second area 123 and the winding core hole 111, and the first area 122 and the second area 123 may be both folded toward the winding core hole 111, thereby forming the folded first tab 12.

The first region 122 includes a plurality of single-chip tabs 121, as shown in fig. 1, at least one single-chip tab 121 of the first region 122 includes a first portion 1211 and a second portion 1212, the first portion 1211 is connected with the main body 11, the second portion 1212 is connected to an end of the first portion 1211 away from the main body 11, the first portion 1211 is bent towards the core hole 111, that is, when the plurality of single-chip tabs 121 are integrally bent towards the core hole 111, the first portion 1211 is also bent towards the core hole 111, and the second portion 1212 is bent away from the core hole 111 in a radial direction of the main body 11, that is, the second portion 1212 is turned outwards, so that the second portion 1212 is blocked at the top of the plurality of single-chip tabs 121, and during the welding process of the first tab 12 and the electrode lead-out structure, for example, when the first tab 12 and the electrode lead-out structure are welded by laser, the laser can be effectively prevented from being hit inside the cylindrical battery 10, and damage inside the cylindrical battery 10 is avoided. Meanwhile, the current passing through the first tab 12 can be rapidly transmitted, the lithium precipitation risk of the cylindrical battery cell 10 can be reduced, and the overall power density of the battery is improved. The electrode lead-out structure may be a current collector, or the electrode lead-out structure may be a post assembly, or the electrode lead-out structure may be a battery case.

For example, one of the plurality of single-chip tabs 121 near the winding core hole 111 is a first single-chip tab, that is, the first single-chip tab is the single-chip tab 121 closest to the winding core hole 111, further, it may be considered that during the winding forming process of the cylindrical electric core 10, the first single-chip tab 121 wound first of the first tab 12 is the first single-chip tab, and the first single-chip tab may include the first portion 1211 and the second portion 1212.

After the plurality of single-chip tabs 121 are integrally bent and folded towards the direction of the winding core hole 111, the second portion 1212 can be turned outwards, so that the production efficiency of the cylindrical battery cell 10 is effectively improved.

The radial direction of the main body 11 may be regarded as a direction extending from the center of the winding core hole 111 of the main body 11 toward the circumferential outer surface of the main body 11, and as shown in fig. 4, the radial direction of the main body 11 may be denoted as a in a cross-sectional view of the cylindrical cell 10 formed along the center thereof.

The body 11 is formed with a winding core hole 111, the winding core hole 111 is a through hole formed by a winding core rod when the cylindrical battery cell 10 is wound, and other structures may be provided in the winding core hole 111 of the battery, or other structures may not be provided in the winding core hole 111 of the battery, which is not limited herein.

In one embodiment, as shown in connection with fig. 2, the plurality of single-piece tabs 121 are formed with a first region 122 and a second region 123 in the radial direction of the body 11, and the first region 122 may include a first single-piece tab; the plurality of single-piece tabs 121 of the first region 122 are bent to form a first portion 1211 and a second portion 1212, so that the plurality of second portions 1212 can form effective protection for the first tab 12, and the safe use performance of the first tab 12 is improved.

As shown in fig. 2, the first region 122 includes a plurality of single tabs 121, and the plurality of single tabs 121 of the first region 122 are folded toward the winding core hole 111 once, and then the plurality of single tabs 121 of the first region 122 are folded outwardly, thereby forming the first portion 1211 and the second portion 1212.

In one embodiment, the plurality of single-sheet tabs 121 of the second area 123 are all bent towards the winding core hole 111, so that the folding capability of the first tab 12 can be effectively improved, the overcurrent capability of the first tab 12 can be ensured, and the safe service performance of the battery can be further improved.

In one embodiment, the total amount of the single tab 121 in the first area 122 is greater than or equal to 3 pieces, so that the single tab 121 in the first area 122 can form effective protection for the first tab 12, and the risk of laser welding through the front end of the single tab 121 in the laser welding process is reduced.

The total amount of the single tabs 121 of the first region 122 may be 3, 4, 5, 8, 10, etc.

In one embodiment, the total amount of the single tabs 121 in the first area 122 is less than or equal to 30 sheets, so that on the basis of ensuring that the single tabs 121 in the first area 122 are protected for the first tabs 12, too many layers of the single tabs 121 in the first area 122 can be avoided, after lamination, the number of layers of the second portion 1212 is thicker, the height of the front end of the first tab 12 is too high, so that the surface of the first tab 12 is uneven, and the risk of cold welding exists between the electrode lead-out structure and the first tab 12.

In one embodiment, the total amount of the individual tabs 121 of the first region 122 is less than the total amount of the individual tabs 121 of the second region 123.

In one embodiment, the ratio of the total amount of the single tab 121 in the first area 122 to the total amount of the single tab 121 in the second area 123 is 0.05-0.5, so that on the basis of ensuring that the first tab 12 has reliable overcurrent capability, the first tab 12 can also be ensured to have relatively high flatness, and meanwhile, the rapid welding of a plurality of single tabs 121 in the first area 122 can be realized, so that the manufacturing efficiency of the battery is improved.

The ratio of the total amount of the single tab 121 of the first region 122 to the total amount of the single tab 121 of the second region 123 may be 0.05, 0.08, 0.1, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.42, 0.45, 0.48, or 0.5, etc.

In one embodiment, the lead-out length of the single tab 121 of the first area 122 from the main body 11 is equal to the lead-out length of the single tab 121 of the second area 123 from the main body 11, so that the forming of a plurality of single tabs 121 can be facilitated, and the manufacturing efficiency of the cylindrical battery cell 10 can be improved to a certain extent.

When the single tab 121 of the first area 122 is folded toward the winding core hole 111, the folding degree of the single tab 121 of the second area 123 toward the winding core hole 111 may be relatively large, and the folding degree of the single tab 121 of the first area 122 toward the winding core hole 111 may be relatively small, so that the single tab 121 of the first area 122 may be formed with the second portion 1212, which may effectively improve the manufacturing efficiency of the cylindrical battery cell 10, and may control the flatness of the first tab 12.

In one embodiment, the plurality of single-piece tabs 121 are further formed with a third region 124, the third region 124 being located between the first region 122 and the second region 123; wherein, the lead-out length of the single tab 121 of the first region 122 from the main body 11 is greater than the lead-out length of the single tab 121 of the third region 124 from the main body 11, so that the single tab 121 of the first region 122 can form a first portion 1211 and a second portion 1212, the first portion 1211 is bent towards the winding core hole 111, and the second portion 1212 is bent away from the winding core hole 111 along the radial direction of the main body 11, so that the second portion 1212 can reliably protect the first tab 12.

As shown in fig. 3, the plurality of single tabs 121 are formed with a first region 122, a second region 123, and a third region 124, and a view after each single tab 121 is straightened is shown in fig. 3.

The lead-out length of the single tab 121 of the first region 122 from the main body 11 may be considered as a length measured after the single tab 121 of the first region 122 is straightened; accordingly, the lead-out length of the single tab 121 of the second region 123 from the main body 11 may be considered as the length measured after the single tab 121 of the second region 123 is straightened; the lead-out length of the single tab 121 of the third region 124 from the main body 11 can be regarded as the length measured after the single tab 121 of the third region 124 is straightened.

In one embodiment, the plurality of single-piece tabs 121 are further formed with a third region 124, the third region 124 being located between the first region 122 and the second region 123; the density of the single tab 121 in the first area 122 is greater than that of the single tab 121 in the third area 124, so that the single tab 121 in the first area 122 can form effective protection for the first tab 12, and the first tab 12 can have reliable overcurrent capability, so that the welding effect of the first area 122 of the first tab 12 and the electrode lead-out structure is improved.

The density of the single tabs 121 of the first region 122 is greater than that of the single tabs 121 of the third region 124, the first region 122 may have multiple layers of tabs, each layer of tabs may include multiple single tabs 121, and accordingly, the third region 124 may have multiple layers of tabs, each layer of tabs may include multiple single tabs 121, and the number of the multiple single tabs 121 included in the first region 122 of the same number of layers may be greater than the number of the multiple single tabs 121 included in the third region 124.

Alternatively, the ratio of the number of the single tabs 121 of the first region 122 to the distance of the first region 122 in the radial direction of the body 11 is greater than the ratio of the number of the single tabs 121 of the third region 124 to the distance of the third region 124 in the radial direction of the body 11 along the radial direction of the body 11. The density of the single tabs 121 in the first region 122 and the density of the single tabs 121 in the third region 124 are the number of single tabs 121 per unit distance. By reducing the number of single tabs 121 per unit distance from the third region 124, a reduction in the thickness of the third region 124 is achieved, avoiding overlapping the third region 124 after bending the first region 122, so that the overall thickness is higher than that of the second region 123, and the surface flatness of the battery is reduced.

In one embodiment, the orthographic projections of the first region 122 and the third region 124 toward the end face 112 of the body 11 are disposed at least partially coincident along the direction of the center line of the cylindrical cell 10; wherein, along the direction of the central line of the cylindrical battery core 10, the third region 124 is located between the second portion 1212 and the main body 11, so that the second portion 1212 can form a top protection for the third region 124, and the risk that welding energy is applied to the inside of the main body 11 when the first tab 12 is welded is reduced.

As shown in fig. 4, the radial direction of the body 11 may be denoted as a, the center line of the cylindrical battery cell 10 may be denoted as B, the first tab 12 includes a first region 122, a third region 124, and a second region 123 along the radial direction of the body 11, and the third region 124 may be located between the second portion 1212 and the body 11 along the direction of the center line of the cylindrical battery cell 10.

In one embodiment, the ratio of the lead-out length of the first portion 1211 from the main body 11 to the lead-out length of the single tab 121 of the second region 123 from the main body 11 is 0.8-1.2, so that the bending length of the first portion 1211 can be effectively ensured, the lead-out length of the first tab 12 is controlled, and the overcurrent capacity of the first tab 12 is effectively improved.

The ratio of the lead-out length of the first portion 1211 from the main body 11 to the lead-out length of the single tab 121 of the second region 123 from the main body 11 may be 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, or the like.

In one embodiment, the length of the first portion 1211 led out from the main body 11 is 2mm-5mm, so that the height of the formed first tab 12 can be effectively controlled, and the influence of the excessive height of the first tab 12 on the energy density of the battery can be avoided, and the disadvantage that the excessive height of the first tab 12 is too small can be avoided, which is not beneficial to ensuring the overcurrent capacity of the first tab 12.

The length of the first portion 1211 exiting the body 11 may be 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, etc.

In one embodiment, as shown in fig. 2, as shown in fig. 1 to 3, the cylindrical battery cell 10 further includes a second tab 13, and the first tab 12 and the second tab 13 with opposite polarities are led out from the same side of the main body 11, so that the height space utilization rate of the battery can be effectively improved, and the overall height of the battery can be reduced, thereby improving the energy density of the battery.

It should be noted that, the specific structural form of the second tab 13 is not limited herein, and the structural form of the second tab 13 may be similar to that of the first tab 12, which is not described herein.

In one embodiment, the first tab 12 and the second tab 13, which are opposite in polarity, may extend from opposite sides of the body 11.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an 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 battery may be a cylindrical battery, or the battery may be a hexagonal-prism-type battery. And winding the first pole piece, the second pole piece opposite to the first pole piece and the diaphragm arranged between the first pole piece and the second pole piece to obtain the winding type battery cell.

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

The battery of the battery pack according to one embodiment of the utility model includes a cylindrical battery core 10, the cylindrical battery core 10 includes a main body 11 and a first tab 12, the main body 11 is formed with a winding core hole 111, the first tab 12 is formed by folding and bending a plurality of single-piece tabs 121, the first tab 12 includes a first area 122 and a second area 123 along a radial direction of the main body 11, by making at least one single-piece tab 121 of the first area 122 include a first portion 1211 and a second portion 1212, the first portion 1211 is bent towards the winding core hole 111, and the second portion 1212 is bent away from the winding core hole 111 along the radial direction of the main body 11, so that the second portion 1212 forms a protection for the top of the plurality of single-piece tabs 121 close to the winding core hole 111, and when the first tab 12 is welded, the risk that welding energy is beaten into the inside the main body 11 can be reduced, and simultaneously the current transmission speed can be increased, and the overall power density of the battery can be increased, thereby reliably improving the service performance of the battery.

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

The battery module comprises a plurality of batteries, the battery module can further comprise a bracket, and the batteries can be fixed 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 batteries.

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

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 (13)

1. The battery is characterized by comprising a cylindrical battery core (10), wherein the cylindrical battery core (10) comprises a main body (11) and a first tab (12) led out from one side of the main body (11), a winding core hole (111) is formed in the main body (11), the first tab (12) comprises a plurality of single-piece tabs (121) along the radial direction of the main body (11), the single-piece tabs (121) are folded and bent to form the first tab (12), a first area (122) and a second area (123) are formed in the single-piece tabs (121) along the radial direction of the main body (11), and the first area (122) is located between the second area (123) and the winding core hole (111);

at least one single tab (121) of the first region (122) comprises a first portion (1211) and a second portion (1212), the first portion (1211) is connected with the main body (11), the second portion (1212) is connected to one end, far away from the main body (11), of the first portion (1211) is bent towards the winding core hole (111), the second portion (1212) is bent away from the winding core hole (111) along the radial direction of the main body (11), and at least one single tab (121) of the second region (123) is bent towards the winding core hole (111).

2. The battery according to claim 1, wherein a plurality of the single-piece tabs (121) of the first region (122) are each folded to form the first portion (1211) and the second portion (1212), and/or a plurality of the single-piece tabs (121) of the second region (123) are each folded toward the winding core hole (111).

3. The battery according to claim 1 or 2, characterized in that the total amount of the single tab (121) of the first region (122) is not less than 3.

4. A battery according to claim 3, characterized in that the total amount of the single tab (121) of the first region (122) is equal to or less than 30.

5. The battery according to claim 1 or 2, characterized in that the ratio of the total amount of the single tab (121) of the first region (122) to the total amount of the single tab (121) of the second region (123) is 0.05-0.5.

6. The battery according to claim 1 or 2, characterized in that the lead-out length of the single tab (121) of the first region (122) from the main body (11) is equal to the lead-out length of the single tab (121) of the second region (123) from the main body (11).

7. The battery according to claim 1, wherein a plurality of the single-piece tabs (121) are further formed with a third region (124), the third region (124) being located between the first region (122) and the second region (123);

wherein, the leading-out length of the single tab (121) of the first region (122) from the main body (11) is longer than the leading-out length of the single tab (121) of the third region (124) from the main body (11).

8. The battery according to claim 1, wherein a plurality of the single-piece tabs (121) are further formed with a third region (124), the third region (124) being located between the first region (122) and the second region (123);

wherein the density of the single tab (121) of the first region (122) is greater than the density of the single tab (121) of the third region (124).

9. The battery according to claim 7 or 8, characterized in that the orthographic projections of the first region (122) and the third region (124) towards the end face (112) of the main body (11) are arranged at least partially coincident in the direction of the central line of the cylindrical cell (10);

wherein the third region (124) is located between the second portion (1212) and the body (11) in a direction along a centerline of the cylindrical cell (10).

10. The battery according to claim 1 or 2, characterized in that the ratio of the lead-out length of the first portion (1211) from the main body (11) to the lead-out length of the single tab (121) of the second region (123) from the main body (11) is 0.8-1.2.

11. The battery according to claim 10, characterized in that the lead-out length of the first portion (1211) from the main body (11) is 2mm-5mm.

12. The battery according to claim 1 or 2, characterized in that the cylindrical cell (10) further comprises a second tab (13), the first tab (12) and the second tab (13) being led out from the same side of the body (11).

13. The battery according to claim 1 or 2, wherein the battery is a cylindrical battery.