CN216120495U

CN216120495U - Cylindrical battery

Info

Publication number: CN216120495U
Application number: CN202122600799.6U
Authority: CN
Inventors: 张汉都; 吴玉源; 周龙; 扈锋; 张喜冲
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-03-22
Anticipated expiration: 2031-10-27

Abstract

The utility model discloses a cylindrical battery, which comprises: the battery comprises a battery core and a tab, wherein the tab is positioned at the axial end part of the battery core body and is electrically connected with the battery core body, the tab comprises a plurality of sub tabs which are arranged at intervals along the circumferential direction of the battery core body, and at least part of the sub tabs are folded along the axial end part of the battery core body towards the direction close to the central axis of the battery core body so as to form a folded part; the conductive connection assembly is arranged at the end part of the battery cell body along the axial direction, and the conductive connection assembly is electrically connected with the turning parts of the sub-tabs. According to the cylindrical battery, the electrode lugs of the battery cell are divided into the plurality of sub-electrode lugs which are arranged along the circumferential direction of the battery cell body at intervals, so that the sub-electrode lugs can be prevented from being folded when being turned inwards, the internal resistance of the electrode lugs is reduced, the current overcurrent capacity is improved, the heat generation is reduced, and the reliability and the yield of the cylindrical battery are ensured.

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, it is pointed out that the cylindrical battery generally realizes the current conduction and the completion of charging and discharging through the connection of the tabs and the poles or the cover plate. Because the cylindrical battery adopts the mode of all lugs to be welded with the current collecting disc, the method has the problems of small flow area, easy corrugation of the lugs, high internal resistance and poor stability caused by the corrugation.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a cylindrical battery which can reduce the internal resistance of a tab and improve the current overcurrent capacity.

The cylindrical battery according to the present invention comprises: the battery comprises a battery core and a tab, wherein the tab is positioned at the axial end part of the battery core body and is electrically connected with the battery core body, the tab comprises a plurality of sub tabs which are arranged at intervals along the circumferential direction of the battery core body, and at least part of the sub tabs are folded along the axial end part of the battery core body towards the direction close to the central axis of the battery core body so as to form a folded part; the conductive connection assembly is arranged at the end part of the battery cell body along the axial direction, and the conductive connection assembly is electrically connected with the turning parts of the sub-tabs.

According to the cylindrical battery provided by the embodiment of the utility model, compared with the cylindrical battery welded by adopting the full-lug and the conductive connecting assembly in the related technology, the lugs of the battery cell are divided into the lugs which are arranged at intervals along the circumferential direction of the battery cell body, so that the lugs are prevented from being folded inwards, the problems of poor contact and larger internal resistance between the lugs and the conductive connecting assembly caused by folding are avoided, the contact area between the conductive connecting assembly and the lugs is increased, the overcurrent capacity of current at the lugs is improved to a greater extent, and the reliability and the yield of the cylindrical battery are ensured.

According to some embodiments of the utility model, a radial length of the folded portion along the cell body is L, a radius of the cell body is R, and L and R satisfy: L/R is more than or equal to 1/2 and less than 1.

In some embodiments, the width of the folded portion in the circumferential direction of the cell body decreases in a direction from the outer periphery of the cell body to the central axis of the cell body.

Further, the fold-over portion is formed in a fan shape or a fan ring shape.

In some embodiments, the conductive connection assembly clamps each of the folds.

Further, the conductive connection assembly includes: the first conductive connecting piece is positioned between the axial end face of the battery cell body and the folding part; the second conductive connecting piece is at least partially positioned on one side, deviating from the first conductive connecting piece, of the folded part, all the folded parts are clamped between the second conductive connecting piece and the first conductive connecting piece, and at least one of the second conductive connecting piece and the first conductive connecting piece is electrically connected with the folded part.

Furthermore, the first conductive connecting piece is formed into a sheet shape, the first conductive connecting piece comprises a connecting body and a plurality of extending portions arranged at intervals along the circumferential direction of the connecting body, the number of the extending portions is the same as that of the folded portions, the extending portions are in one-to-one correspondence, and each extending portion is overlapped with the corresponding folded portion along the axial direction of the cell body and is matched with the folded portion in shape.

According to some embodiments of the utility model, a protrusion is formed on one of the second conductive connecting member and the first conductive connecting member, and the protrusion is inserted into the folded portion and connected to the other of the second conductive connecting member and the first conductive connecting member.

Further, the sub-tab includes a plurality of stacked tab portions, each of the tab portions including: the non-conductive membrane with establish relative both sides in the thickness direction of non-conductive membrane, the arch with every of sub-polar ear group the utmost point ear the electric film is all connected.

According to some embodiments of the utility model, the second conductive connector comprises a weld protection plate and a current collector plate, the weld protection plate comprises a first weld protection part and a second weld protection part which are connected, the first weld protection part is located between the folded part and the current collector plate, and the second weld protection part covers one side of the current collector plate far away from the first weld protection part.

Further, the first welding part is provided with the protrusion.

According to some embodiments of the utility model, the number of the first welding protection parts is the same as that of the sub-tabs, the first welding protection parts correspond to the sub-tabs one by one, inner ends of the first welding protection parts are connected, outer ends of the first welding protection parts extend towards a direction far away from a central axis of the battery core body, and the protrusion is formed on each first welding part.

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

Drawings

FIG. 1 is a schematic diagram of a cylindrical battery according to an embodiment of the present invention;

FIG. 2 is an enlarged view of encircled portion A in FIG. 1;

FIG. 3 is a schematic view of the pole ear shown in FIG. 2;

FIG. 4 is a top view of the cylindrical battery shown in FIG. 1;

fig. 5 is a schematic view of the cell shown in fig. 1;

FIG. 6 is a schematic view of the first conductive connection shown in FIG. 1;

FIG. 7 is a schematic view of a current collecting disk according to an embodiment of the present invention;

FIG. 8 is a schematic view of a weld protection sheet according to an embodiment of the present invention;

fig. 9 is a schematic view of another angle of the weld protection sheet shown in fig. 8.

Reference numerals:

cylindrical battery 100:

a battery cell 1, a battery cell body 10, a tab 11, a sub-tab 111, a tab part 112, a conductive film 1121, a non-conductive film 1122, a folded part 113,

the conductive connection assembly 2 is provided with a conductive connection assembly,

a first conductive connecting member 21, a connecting body 211, an extension 212,

the second conductive connector 22, the welding protection sheet 221, the first welding protection portion 2211, the projection 2212, the second welding protection portion 2213, the current collecting plate 222, the current collecting portion 2221 and the lead-out portion 2222.

Detailed Description

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

A cylindrical battery 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 9.

Referring to fig. 1 to 5, a cylindrical battery 100 according to an embodiment of the present invention includes: cell 1 and electrically conductive coupling assembling 2.

Specifically, the battery cell 1 may include a cell body 10 and tabs 11, the tabs 11 are located at an end of the cell body 10 along an axial direction, the tabs 11 are electrically connected to the cell body 10, the tabs 11 may include a plurality of sub-tabs 111, where a plurality refers to two or more, the plurality of sub-tabs 111 may be arranged at intervals along a circumferential direction of the cell body 10, at least a portion of the sub-tabs 111 is folded along an axial end of the cell body 10 toward a direction adjacent to a central axis of the cell body 10 to form folded portions 113, that is, the folded portions 113 are substantially parallel to end faces of the cell body 10 along the axial direction; the conductive connection assembly 2 may be disposed at an end of the cell body 10 along the axial direction, and the conductive connection assembly 2 is electrically connected to the folded portion 113 of each sub-tab 111.

For example, as shown in fig. 1 and fig. 5, the cell body 10 may be formed in a cylindrical shape, the tab 11 is formed at one end of the cell body 10 along an axial direction, the tab 11 includes three sub-tabs 111, the three sub-tabs 111 may be distributed at intervals along a circumferential direction of the cell body 10, the sub-tabs 111 may be obtained by die cutting, at least a portion of the sub-tabs 111 is folded along an end surface of the cell body 10 toward a direction adjacent to a central axis of the cell body 10 to form a folded portion 113, for example, during a manufacturing process, the state of the sub-tabs 111 obtained by the die cutting process extends substantially along the axial direction of the cell body 10, when the sub-tabs 111 and the conductive connecting assembly 2 are connected, the conductive connecting assembly 2 may be first placed at an end of the cell body 10, then the sub-tabs 111 are flattened toward the direction adjacent to the central axis of the cell body 10, so that at least a portion of the sub-tabs 111 forms the folded portion 113, like this, the extending direction of the folded portion 113 in the flattened state is roughly parallel to the end face of the cell body 10, and, in the flattened state, the folded portions 113 of the plurality of sub tabs 111 are spaced apart along the circumference of the cell body 10, the conductive connection assembly 2 is electrically connected with the folded portion 113 of each sub tab 111, thus, the cell 1 can converge the current to the conductive connection assembly 2 through the folded portions 113 of the plurality of sub tabs 111, and then output energy externally, because the sub tabs 111 are flattened, the conductive connection assembly 2 can contact with the surface of each sub tab 111, the contact area of the conductive connection assembly 2 and the sub tabs 111 can be increased, thereby being beneficial to improving the current overcurrent capacity at the tabs 11.

According to the cylindrical battery 100 of the embodiment of the utility model, compared with the cylindrical battery 100 welded by adopting the full tabs 11 and the conductive connecting assembly 2 in the related art, the tabs 11 of the battery core 1 are divided into the tabs 11 arranged at intervals along the circumferential direction of the battery core body 10, so that the tabs 11 are prevented from being folded inwards, the problems of poor contact and larger internal resistance between the tabs 11 and the conductive connecting assembly 2 caused by folding are avoided, the contact area between the conductive connecting assembly 2 and the tabs 11 is increased, the overcurrent capacity of current at the tabs 11 is improved to a greater extent, and the reliability and yield of the cylindrical battery 100 are ensured.

According to some embodiments of the present invention, the length of the folded portion 113 along the radial direction of the cell body 10 is L, the radius of the cell body 10 is R, and L, R satisfy: 1/2 < L/R < 1, for example, the ratio L/R of the radial length of the folded part 113 along the cell body 10 to the radius of the cell body 10 may be 1/2, 2/3 or 3/4, thus, not only can the overcurrent capacity of the current at the sub-tabs 111 be prevented from being reduced due to the contact area between the folded part 113 and the conductive connecting assembly 2 being too small when the length of the folded part 113 along the radial direction of the cell body 10 is too short, but also the overlapping of a plurality of sub-tabs 111 caused by the too long length of the folded part 113 along the radial direction of the cell body 10 can be avoided, thereby increasing the internal resistance at the overlapping part, reducing the current overcurrent capacity and increasing the heat generation, avoiding the uneven placing plane of the conductive connecting component 2, therefore, poor contact between the conductive connecting component 2 and the tab 11 is caused, and the quality of the electrical connection between the conductive connecting component and the tab is affected.

In some embodiments, referring to fig. 2 and 3, in a direction from the outer periphery of the cell body 10 to the central axis of the cell body 10, the width of the folded portion 113 in the circumferential direction of the cell body 10 is reduced, so that the folded portions 113 of two circumferentially adjacent sub-tabs 111 can be prevented from contacting and overlapping each other, thereby increasing the internal resistance at the overlapping portion, generating heat more, and facilitating to ensure the welding quality of the conductive connection assembly 2 and the folded portion 113.

Further, referring to fig. 3, the folded portion 113 may be formed in a fan shape, or the folded portion 113 may also be formed in a fan ring shape, where the fan ring shape refers to that both the outer edge and the inner edge of the folded portion 113 are formed into arc-shaped segments extending along the circumferential direction of the cell body 10, although the utility model is not limited thereto, and the inner edge of the folded portion 113 is formed in a straight line shape, in summary, it can be ensured that the folded portions 113 of two adjacent sub-tabs 111 do not overlap or contact, thereby ensuring the welding quality of the conductive connection assembly 2 and the tab 11.

In some embodiments, referring to fig. 1 and fig. 2, each folded portion 113 may be clamped by the conductive connection assembly 2, that is, a part of the conductive connection assembly 2 is located on one side of the folded portion 113, which faces the cell body 10, another part of the conductive connection assembly 2 is located on one side of the folded portion 113, which faces away from the cell body 10, and the parts of the conductive connection assembly 2, which are located on two sides of the folded portion 113 respectively, are in press fit with the folded portion 113, so that the connection stability of the conductive connection assembly 2 and the folded portion 113 may be ensured, and the welding quality of the conductive connection assembly 2 and the folded portion 113 may be further improved.

Further, referring to fig. 1 and 2, the conductive connection assembly 2 may include: a first conductive connection 21 and a second conductive connection 22. The first conductive connecting piece 21 may be located between the axial end face of the cell body 10 and the folded portion 113; at least part of the second conductive connecting piece 22 is located on the side of the folded part 113 away from the first conductive connecting piece 21, the folded parts 113 of all the sub-tabs 111 are all clamped between the second conductive connecting piece 22 and the first conductive connecting piece 21, and at least one of the second conductive connecting piece 22 and the first conductive connecting piece 21 is electrically connected with the folded part 113. Because utmost point ear 11 and electrically conductive coupling assembling 2 adopt welding such as laser welding usually, ultrasonic bonding's mode is connected, establish first electrically conductive connecting piece 21 between the axial terminal surface of electricity core body 10 and the portion 113 that turns over, when the welding, first electrically conductive connecting piece 21 can play the supporting role to the portion 113 that turns over, it is relatively poor to avoid because electricity core body 10 texture is soft to be difficult to play the supporting role to utmost point ear 11 and the welding effect that leads to, simultaneously, under the circumstances that first electrically conductive connecting piece 21 is connected with the portion 113 electricity that turns over, first electrically conductive connecting piece 21 can increase the overcurrent area of electric current, thereby make the overcurrent capacity of electric current improve.

For example, the first conductive connecting member 21 may be electrically connected to the folded portion 113, the second conductive connecting member 22 may be electrically connected to the folded portion 113, or both the first conductive connecting member 21 and the second conductive connecting member 22 may be electrically connected to the folded portion 113, and when the second conductive connecting member 22 is electrically connected to the folded portion 113 (including only the second conductive connecting member 22 is electrically connected to the folded portion 113 and both the first conductive connecting member 21 and the second conductive connecting member 22 are electrically connected to the folded portion 113), the second conductive connecting member 22 may also be configured to be electrically connected to a pole or a cover plate of the cylindrical battery 100, so that the battery cell 1 may output current outwards. For example, it may be that a portion of the second conductive connection member 22 overlaps the folded portion 113, and another portion extends to the outer peripheral side of the cell body 10 and is electrically connected to the pole of the cylindrical battery 100.

Still further, referring to fig. 1, 4 and 6, the first conductive connecting member 21 may be formed in a sheet shape, the first conductive connecting member 21 may include a connecting body 211 and a plurality of extending portions 212, the plurality of extending portions 212 may be disposed at intervals along a circumferential direction of the connecting body 211, the number of the extending portions 212 is the same as the number of the folded portions 113 and corresponds to one, and each extending portion 212 is overlapped with the corresponding folded portion 113 in an axial direction of the cell body 10 and is adapted in shape, so that the weight of the first conductive connecting member 21 may be reduced while ensuring that the first conductive connecting member 21 can support the folded portion 113 and has a sufficient effective contact area with the folded portion 113, thereby facilitating the reduction in weight of the cylindrical battery 100.

For example, as shown in fig. 4, the tab 11 includes three sub-tabs 111, the three sub-tabs 111 are distributed at intervals along the circumferential direction of the cell body 10, each sub-tab 111 is formed into a substantially fan-ring shape, the first conductive connecting member 21 includes a connecting body 211 and three extending portions 212, the three extending portions 212 respectively correspond to the three sub-tabs 111 one by one, and the shape of each extending portion 212 is adapted to the shape of the sub-tab 111, that is, each extending portion 212 is also formed into a fan-ring shape, and each extending portion 212 and the corresponding sub-tab 111 are oppositely arranged along the axial direction of the cell body 10, so that compared with the case that the first conductive connecting member 21 is arranged into a complete circle shape adapted to the axial end face of the cell body 10, the first conductive connecting member 21 of the present embodiment can ensure that the first conductive connecting member 21 can support the folded portion 113 and has a sufficient effective contact area with the folded portion 113, the weight of itself is reduced, thereby contributing to the reduction in the weight of the cylindrical battery 100. Of course, the present invention is not limited thereto, and the number of the sub-tabs 111 and the number of the extending portions 212 on the first conductive connecting member 21 may be appropriately set according to actual needs.

According to some embodiments of the present invention, referring to fig. 1, one of the second conductive connecting member 22 and the first conductive connecting member 21 is formed with a protrusion 2212, and the protrusion 2212 is inserted into the folded portion 113 and connected to the other of the second conductive connecting member 22 and the first conductive connecting member 21, so that the second conductive connecting member 22 and the first conductive connecting member 21 can be electrically connected, thereby further increasing the contact area between the conductive connecting member 2 and the tab 11 and contributing to increase the overcurrent capacity of current.

For example, the protrusion 2212 may be formed on the first conductive connector 21, and at this time, the protrusion 2212 may be connected to the second conductive connector 22 through the folded portion 113; alternatively, the protrusion 2212 may be formed on the second conductive connection member 22, in which case the protrusion 2212 may pass through the folded portion 113 to be connected to the first conductive connection member 21; further alternatively, the first conductive connector 21 and the second conductive connector 22 may each have a protrusion 2212 formed on one side surface thereof facing each other, and the protrusion 2212 of the first conductive connector 21 and the protrusion 2212 of the second conductive connector 22 may each be connected to each other through a portion of the folded portion 113, thereby allowing the battery to better output current to the outside.

Further, referring to fig. 2 and 3, the sub-tab 111 may include a plurality of stacked tab portions 112, and each tab portion 112 may include: the non-conductive film 1122 and the two conductive films 1121, wherein the two conductive films 1121 are disposed on opposite sides of the non-conductive film 1122 in the thickness direction, and the protrusion 2212 is electrically connected to the conductive film 1121 of each tab portion 112 of the sub-tab 111, so that the current on the conductive film 1121 of each tab portion 112 of the sub-tab 111 can be converged onto the conductive connecting assembly 2 through the protrusion 2212, thereby fully ensuring the overcurrent capability at the tab 11.

In a specific example, the conductive film 1121 may be a copper foil, an aluminum foil, or other thin film with good conductivity.

Optionally, in the axial direction of the cell body 10 and in the direction from the second conductive connecting member 22 toward the first conductive connection, the sectional area of at least a part of the protrusion 2212 parallel to the end face of the cell body 10 is gradually reduced, so that the piercing capability of the protrusion 2212 to the folded part 113 can be improved, thereby improving the welding efficiency and the welding quality of the conductive connecting assembly 2 and the tab 11, and simultaneously eliminating the problem of large internal resistance caused by the tab 11 made of the composite material.

According to some embodiments of the present invention, referring to fig. 1, 2, and 8, the second conductive connector 22 may include a welding protection sheet 221 and a current collecting plate 222. The welding protection plate 221 may include a first welding protection portion 2211 and a second welding protection portion 2213, the first welding protection portion 2211 is connected to the second welding protection portion 2213, the first welding protection portion 2211 is located between the folded portion 113 and the current collecting plate 222, and the second welding protection portion 2213 covers one side of the current collecting plate 222 far from the first welding protection portion 2211, that is, the current collecting plate 222 is sandwiched between the first welding protection portion 2211 and the second welding protection portion 2213 of the welding protection plate 221, so that the connection stability between the current collecting plate 222 and the welding protection plate 221 may be further improved, thereby indirectly improving the connection stability between the current collecting plate 222 and the electric core 1, and simultaneously increasing the welding area between the welding protection plate 221 and the current collecting plate 222 and improving the overcurrent capacity of the current at the second conductive connector 22.

For example, as shown in fig. 1, the welding protection sheet 221 is disposed on a side of the folded portion 113 away from the first conductive connecting part 21, and the welding protection sheet 221 includes a first welding protection portion 2211 and a second welding protection portion 2213, where the first welding protection portion 2211 and the second welding protection portion 2213 are connected, the second welding protection portion 2213 may be formed by folding the welding protection sheet 221 along a radial portion of the cell body 10 toward a central axis of the cell body 10, and the current collecting plate 222 is sandwiched between the first welding protection portion 2211 and the second welding protection portion 2213, so that connection stability between the current collecting plate 222 and the cell 1 may be improved, a welding area between the welding protection sheet 221 and the current collecting plate 222 may also be increased, and an overcurrent capacity of a current at the second conductive connecting part 22 may be improved.

Further, referring to fig. 1, 4 and 7, the current collecting tray 222 may include a current collecting portion 2221 and a lead-out portion 2222, wherein the current collecting portion 2221 is substantially formed in a disk shape, the current collecting portion 2221 is sandwiched between the first welding protection portion 2211 and the second welding protection portion 2213, the lead-out portion 2222 is located on the outer circumferential side of the cell body 10 and is connected to the current collecting portion 2221, and the lead-out portion 2222 may be connected to a pole of the cylindrical battery 100, so that the cell 1 may output current to the outside.

Further, a protrusion 2212 is formed on the first welding portion, for example, as shown in fig. 1, fig. 2 and fig. 9, the protrusion 2212 may be formed on a side of the first welding portion facing the cell body 10, so that the protrusion 2212 may pass through the folded portion 113 to be connected to the first conductive connecting member 21, so that it is ensured that the welding protection sheet 221 is connected to the first conductive connecting member 21, so that the conductive layer of the tab portion 112 in each sub-tab 111 may be converged onto the conductive connecting member 2 through the protrusion 2212, thereby sufficiently ensuring the overcurrent capacity at the tab 11.

According to some embodiments of the present invention, referring to fig. 4 and 8, a plurality of first welding protection portions 2211 may be provided, the first welding portions are the same in number and correspond to the sub-tabs 111 one by one, inner ends of the plurality of first welding protection portions 2211 are connected, an outer end of each first welding protection portion 2211 extends in a direction away from a central axis of the cell body 10, and a protrusion 2212 is formed on each first welding protection portion 2211, so that each first welding protection portion 2211 can be ensured to be electrically connected to the conductive layer of the tab portion 112 in each sub-tab 111 through the protrusion 2212, thereby further increasing an overcurrent area of current and improving overcurrent efficiency.

For example, as shown in fig. 8, the tab 11 includes three sub-tabs 111, the three sub-tabs 111 are distributed at intervals along the circumferential direction of the cell body 10, each sub-tab 111 is formed in a substantially fan-shaped ring shape, three first welding protection portions 2211 can be provided, the first welding protection portions 2211 correspond to the sub-tabs 111 one by one, the first welding protection portions 2211 are opposite to the folded portions 113 of the sub-tabs 111 along the axial direction of the cell body 10, the inner ends of the three first welding protection portions 2211 are connected, and the outer end of each first weld-protecting portion 2211 extends outward in the radial direction of the cell body 10, and the side of each first weld-protecting portion 2211 facing the cell body 10 is formed with a projection 2212, so that, it is ensured that each first welding protection portion 2211 can be electrically connected with the conductive layer of the tab portion 112 in each sub-tab 111 through the protrusion 2212, so that the current flowing area is further increased, and the current flowing efficiency is improved.

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

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

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

Claims

1. A cylindrical battery, comprising:

the battery comprises a battery core and a tab, wherein the tab is positioned at the axial end part of the battery core body and is electrically connected with the battery core body, the tab comprises a plurality of sub tabs which are arranged at intervals along the circumferential direction of the battery core body, and at least part of the sub tabs are folded along the axial end part of the battery core body towards the direction close to the central axis of the battery core body so as to form a folded part;

the conductive connection assembly is arranged at the end part of the battery cell body along the axial direction, and the conductive connection assembly is electrically connected with the turning parts of the sub-tabs.

2. The cylindrical battery of claim 1, wherein the radial length of the folded portion along the cell body is L, the radius of the cell body is R, and L and R satisfy: L/R is more than or equal to 1/2 and less than 1.

3. The cylindrical battery according to claim 1, wherein the width of the folded portion in the circumferential direction of the cell body decreases in a direction from the outer periphery of the cell body to the central axis of the cell.

4. The cylindrical battery according to claim 3, wherein the folded portion is formed in a fan shape or a fan ring shape.

5. The cylindrical battery according to any one of claims 1 to 4 wherein the conductive connection assembly clamps each of the folds.

6. The cylindrical battery of claim 5, wherein the conductive connection assembly comprises:

the first conductive connecting piece is positioned between the axial end face of the battery cell body and the folding part;

the second conductive connecting piece is at least partially positioned on one side, deviating from the first conductive connecting piece, of the folded part, all the folded parts are clamped between the second conductive connecting piece and the first conductive connecting piece, and at least one of the second conductive connecting piece and the first conductive connecting piece is electrically connected with the folded part.

7. The cylindrical battery according to claim 6, wherein the first conductive connecting member is formed in a sheet shape, the first conductive connecting member includes a connecting body and a plurality of extending portions arranged at intervals in a circumferential direction of the connecting body, the number of the extending portions is the same as that of the folded portions, the extending portions are in one-to-one correspondence, and each extending portion and the corresponding folded portion are stacked in an axial direction of the cell body and are matched in shape.

8. The cylindrical battery according to claim 6, wherein a protrusion is formed on one of the second conductive connecting member and the first conductive connecting member, and the protrusion is inserted into the folded portion and connected to the other of the second conductive connecting member and the first conductive connecting member.

9. The cylindrical battery of claim 8 wherein said sub-tab comprises a plurality of stacked tab portions, each said tab portion comprising: the lug bosses are electrically connected with the conductive films of the lug parts of the sub-lugs.

10. The cylindrical battery according to claim 8, wherein the second conductive connector comprises a weld protection plate and a current collector plate, the weld protection plate comprises a first weld protection portion and a second weld protection portion connected, the first weld protection portion is located between the folded portion and the current collector plate, and the second weld protection portion covers a side of the current collector plate away from the first weld protection portion.

11. The cylindrical battery according to claim 10, wherein the first weld is formed with the projection thereon.

12. The cylindrical battery according to claim 10, wherein the number of the first welding protection parts is the same as that of the sub-tabs, the first welding protection parts are in one-to-one correspondence, inner ends of the first welding protection parts are connected, outer ends of the first welding protection parts extend in a direction away from a central axis of the battery cell body, and the protrusion is formed on each first welding part.