CN216773469U - Battery with a battery cell - Google Patents

Abstract

The utility model discloses a battery, which comprises: the battery cell comprises a battery cell body and a plurality of layers of tabs which are connected to one axial end of the battery cell body and are arranged in a stacked mode; the current collecting piece comprises a plurality of current collecting parts, the current collecting parts are electrically connected with one another, the current collecting parts are arranged between every two adjacent layers of lugs and on two sides of the multiple layers of lugs in the stacking direction, and each current collecting part is electrically connected with the lug adjacent to the stacking direction.

Description

Battery with a battery cell

Technical Field

The utility model relates to the field of chemical power sources, in particular to a battery.

Background

In the related art, the current conduction and the charging and discharging of the cylindrical lithium battery are currently achieved through the connection of the tabs and the cover plate. Generally, a cylindrical battery adopts a full-lug mode to be directly welded with a current collecting disc in a spot welding mode, but due to the insulating characteristic of a composite material lug intermediate layer material, double faces are not conducted, and the method has the defects of small flow area, increased internal resistance and poor contact conduction stability in the middle of a lug.

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 battery, and the battery can be respectively connected and conducted with a confluence piece through the confluence piece on the two sides of a composite material current collector, so that the overcurrent area is increased, and the current conduction resistance is reduced.

The battery according to the present invention comprises: the battery cell comprises a battery cell body and a plurality of layers of electrode lugs which are connected to one axial end of the battery cell body and are arranged in a laminated mode; the piece that converges, it includes a plurality of portions that converge, and is a plurality of to converge between the portion electricity is connected, every adjacent two-layer between the utmost point ear and multilayer the utmost point ear all is equipped with in the both sides of range upon range of direction portion that converges, and every converge the portion all with adjacent in range upon range of direction utmost point ear electricity is connected.

According to the battery provided by the utility model, the bus parts are arranged between every two adjacent lugs and on both sides of the lugs in the stacking direction, so that the two sides of each layer of lugs can be directly and electrically connected with the bus piece, the overcurrent area is increased, the current on-resistance is reduced, and the stability of electrical connection is improved.

In some embodiments, further comprising: and the current collecting plate is arranged on one side of the current collecting piece, which is deviated from the battery core, and is electrically connected with the current collecting piece.

In some embodiments, the battery cell includes a battery cell body, one end of the tab is connected to the battery cell body, and the other end of the tab extends outward away from the battery cell body along an axial direction of the battery cell body, multiple layers of the tab are stacked in a radial direction of the battery cell body, and multiple bus portions of the bus bar are sequentially arranged in the radial direction of the battery cell body.

In some embodiments, the battery further comprises: a tightening member provided at one end of the cell body in an axial direction and configured to clamp the plurality of bus bar portions of the bus bar to the plurality of layers of the tabs in a radial direction of the bus bar.

In some embodiments, the lacing member comprises: first baffle portion, second baffle portion and connecting plate portion, first baffle portion with the second baffle portion is located respectively converge the piece in the inside and outside both sides of radial direction, the connecting plate portion is followed the radial direction of converging the piece extends and both ends respectively with first baffle portion with the second baffle portion links to each other, tighten the piece with converge the piece and be in interference fit on the radial direction of converging the piece.

In some embodiments, the tightening member includes a plurality of tightening members arranged at intervals in a circumferential direction of the bus bar.

In some embodiments, one end of the tab is connected to the battery cell body, and the other end of the tab is bent along a radial direction of the battery cell body, multiple layers of the tab are stacked in an axial direction of the battery cell body, and multiple bus portions of the bus bar are sequentially arranged in the axial direction of the battery cell body.

In some embodiments, an end of one axial end of the cell body is provided with a plurality of pole lug groups, the plurality of pole lug groups are arranged at intervals in the circumferential direction of the cell body, and each pole lug group comprises a plurality of layers of pole lugs arranged in a stacking manner in the radial direction of the cell body.

In some embodiments, the bus bar is formed in a spiral shape sequentially extending in a lamination direction of a portion of the core layer connected to the bus bar.

In some embodiments, the bus bar is formed by winding a conductive filament having a diameter in the range of 9 to 120 microns.

In some embodiments, the bus bar is formed by winding a conductive sheet, a width direction of the conductive sheet is parallel to an extending direction of a portion of the core layer connected to the bus bar, and a width of the conductive sheet is equal to or less than 30 mm.

In some embodiments, the cell comprises a composite current collector comprising: the first conductive layer and the second conductive layer are respectively covered on the two side surfaces of the supporting insulating layer in the thickness direction.

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 battery according to one embodiment of the present invention;

FIG. 2 is an enlarged view at A shown in FIG. 1;

FIG. 3 is a top view of the battery shown in FIG. 1;

FIG. 4 is a schematic view of one embodiment of the bus bar shown in FIG. 1;

FIG. 5 is a side view of the bus bar shown in FIG. 4;

FIG. 6 is a schematic view of another embodiment of the bus bar shown in FIG. 1;

FIG. 7 is a side view of the bus bar shown in FIG. 6;

figure 8 is a schematic view of the binding member shown in figure 1;

figure 9 is a cross-sectional view of the binding member shown in figure 8;

fig. 10 is a schematic view of a battery according to another embodiment of the present utility model;

FIG. 11 is a top view of the battery shown in FIG. 10;

FIG. 12 is a schematic view of the bus bar shown in FIG. 10;

FIG. 13 is a side view of the bus bar shown in FIG. 12;

FIG. 14 is a schematic view of another embodiment of the bus bar shown in FIG. 10;

FIG. 15 is a side view of the bus bar shown in FIG. 14;

FIG. 16 is a schematic view of the current collecting disk shown in FIG. 1;

FIG. 17 is a side view of the manifold disk shown in FIG. 16;

fig. 18 is a schematic view of the tab shown in fig. 10;

fig. 19 is a schematic view of another embodiment of the tab shown in fig. 10;

fig. 20 is a cross-sectional view of the pole piece shown in fig. 1.

Reference numerals are as follows:

a battery 100;

a cell body 10;

a pole piece 11, a support insulating layer 111, a first conductive layer 112, a second conductive layer 113, a tab 12;

a bus bar 20;

a bus portion 21;

a collector plate 30;

an electrical connection section 31, an extension section 32;

a tightening member 40;

a first baffle portion 41, a second baffle portion 42, a connecting plate portion 43;

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 battery 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 20.

As shown in fig. 1, a battery 100 according to an embodiment of the present invention includes: cells and a bus bar 20.

Specifically, as shown in fig. 1, the battery cell includes a battery cell body 10 and a plurality of layers of tabs 12 connected to one axial end of the battery cell body 10 and arranged in a stacked manner, the bus bar 20 includes a plurality of bus portions 21, the plurality of bus portions 21 are electrically connected to each other, the bus portions 21 are respectively disposed between every two adjacent layers of tabs 12 and on two sides of the multilayer tabs 12 in the stacked direction, and each bus portion 21 is electrically connected to the tab 12 adjacent in the stacked direction, so that the double faces of each layer of tabs 12 are electrically connected to the bus bar 20, thereby increasing the overcurrent area and reducing the current conduction resistance.

For example, referring to fig. 1, the battery cell includes a battery cell body 10 and multiple layers of tabs 12 connected to an axial upper end of the battery cell body 10 and arranged in a stacked manner, where the tabs 12 are connected to the axial upper end of the battery cell body 10 and are bent inward toward a radial direction of the battery cell body 10, a bus portion 21 of the bus bar 20 is disposed between every two adjacent tabs 12, and it is achieved that the tabs 12 of each layer may be directly electrically connected to the bus portion 21 of the bus bar 20. For another example, the tabs 12 are connected to the upper axial end of the cell body 10 and extend upward toward the axial direction of the cell body 10, each adjacent tab 12 is electrically connected to each other, and the bus portion 21 is disposed between each adjacent tab 12 to realize the electrical connection between the two sides of each tab 12 and the bus piece 20, so that the flow area is increased, and the stability of the electrical connection between the tabs 12 and the bus piece 20 is increased.

Compared with the process of welding the puncture pole pieces in the prior art, the method has no damage to the pole pieces and reduces the on-resistance between the pole pieces.

According to the battery 100 of the utility model, the bus portions 21 are arranged between every two adjacent tabs 12 and on both sides of the plurality of tabs 12 in the stacking direction, so that both sides of each layer of tabs 12 can be directly and electrically connected with the bus piece 20, the flow area is increased, the current on-resistance is reduced, and the stability of electrical connection is improved.

In an embodiment of the present invention, as shown in fig. 1, the battery 100 may further include a current collecting plate 30, the current collecting plate 30 is disposed on a side of the current collecting piece 20 away from the battery core and is electrically connected to the current collecting piece 20, one end surface of the current collecting plate 30 close to the battery core is electrically connected to the current collecting piece 20, and the other end surface is electrically connected to an outer cover of the battery 100, so as to achieve electrical connection between the battery 100 and the outside.

Wherein, as shown in fig. 16 and 17, the current collecting plate 30 is formed in a sheet shape, the current collecting plate 30 may include an electrical connection section 31 and an extension section 32, the electrical connection section 31 is formed in a shape adapted to the shape of the upper side surface of the bus bar 20 for welding with the bus bar 20, and the extension section 32 is used to increase a connection area between the current collecting plate 30 and the outer cover of the battery 100, so that the electrical connection between the current collecting plate 30 and the outer cover of the battery 100 is more stable.

In an embodiment of the present invention, as shown in fig. 2, one end of the tab 12 is connected to the cell body 10, and the other end extends outward away from the cell body 10 along the axial direction of the cell body 10, the multiple layers of tabs 12 are stacked in the radial direction of the cell body 10, the battery 100 may further include a tightening member 40, the tightening member 40 is disposed at one end of the cell body 10 in the axial direction, the tightening member 40 is configured to clamp the multiple bus portions 21 of the bus member 20 to the multiple layers of tabs 12 in the radial direction of the bus member 20, thereby further fixing the bus portions 21 of the bus member 20 to the multiple layers of tabs 12 and increasing the stability of current transmission between the multiple layers of tabs 12 and the bus member 20.

For example, referring to fig. 1 and 2, the cell body 10 is formed in a cylindrical shape, the bus bar 21 is provided between each adjacent two of the tabs 12, the bus bar 21 is provided on each of the tabs 12 on both sides in the stacking direction, and the tightening member 40 is provided on the tabs 12 on the upper end of the cylindrical cell body 10 and is arranged to clamp each bus bar 21 to its adjacent tab 12 in the radial direction of the bus bar 20, thereby further fixing the bus bar 20 between the tabs 12. The stability of the electrical connection between the tab 12 and the bus bar 20 is increased.

In one embodiment of the present invention, as shown in fig. 8 and 9, the binding member 40 may comprise: first baffle portion 41, second baffle portion 42 and connecting plate portion 43, first baffle portion 41 and second baffle portion 42 are located the inside and outside both sides of piece 20 that converges in the radial direction respectively, connecting plate portion 43 extends along the radial direction of piece 20 that converges, the both ends of connecting plate 43 link to each other with first baffle portion 41 and second baffle portion 42 respectively, tighten piece 40 and converge piece 20 interference fit on the radial direction of piece 20 that converges, utilize this kind of interference fit's mechanical system to come to press from both sides a plurality of portions 21 that converge of piece 20 and press from both sides tightly on multilayer utmost point ear 12, in the assembling process, only need tighten piece 40 joint to converge piece 20 and multilayer utmost point ear 12 on can, the assembling process is simple, need not add connecting medium.

As shown in fig. 1, the cell body 10 is formed into a hollow cylindrical shape, and the first baffle portion 41 and the second baffle portion 42 are both formed into an arc-shaped plate shape matched with the cylindrical battery 100, so that the first baffle portion 41 and the second baffle portion 42 of the tightening member 40 can be attached to the inner and outer peripheral surfaces of the cell body 10, the effect of clamping the current collecting member 20 is better achieved, and the electrical connection between the tab 12 and the current collecting member 20 is more stable.

In one embodiment of the present invention, as shown in fig. 3, the tightening member 40 includes a plurality of tightening members 40, and the plurality of tightening members 40 are arranged at intervals in the circumferential direction of the bus bar 20, so that the bus bar portions 21 can be clamped between the pole pieces 11 in the circumferential direction of the bus bar 20, and the clamping effect can be more fully ensured in the circumferential direction of the bus bar 20.

For example, referring to fig. 3, the number of the tightening members 40 on the bus bar 20 is two, and two tightening members 40 are uniformly spaced in the circumferential direction of the bus bar 20, so that the clamping effect of the tightening members 40 on the bus bar 20 and the pole piece 11 is more uniform in the circumferential direction of the bus bar 20, the phenomena of local clamping and local loosening when a single tightening member 40 is clamped are avoided, and the phenomenon of unstable electrical connection is improved.

In an embodiment of the present invention, as shown in fig. 10 and fig. 18, one end of each tab 12 is connected to the cell body 10, and the other end is bent along a radial direction of the cell body 10, multiple layers of the tabs 12 are stacked in an axial direction of the cell body 10, the tabs 12 are cell layers, and multiple bus portions 21 of the bus piece 20 are sequentially arranged in the axial direction of the cell body 10, and this bending manner of the full tabs enables two surfaces of each layer of the pole piece 11 to be electrically connected to the bus portions 21 of the bus piece 20 through the tabs 12, thereby increasing an overcurrent area.

The bus portions 21 are disposed between every two adjacent tabs 12 and on both sides of the tabs 12 in the vertical direction, and each bus portion 21 is electrically connected to two adjacent tabs 12, so that both surfaces of each tab 12 in the thickness direction (for example, the vertical direction shown in fig. 10) are electrically connected to the bus portions 21, and further both surfaces of each layer of tabs 12 are directly electrically connected to the bus piece 20, thereby increasing the flow area.

For example, as shown in fig. 10, the cell body 10 is formed in a cylindrical shape, the pole pieces 11 are formed as tabs 12 at the upper end of the cell body 10 in the axial direction, the tabs 12 are bent perpendicular to the axis of the cell body 10 in the radial direction of the cell body 10, multiple layers of tabs 12 are stacked in the up-down direction, multiple bus portions 21 of the bus piece 20 are sequentially arranged in the up-down direction, the bus portions 21 are respectively provided between every two adjacent tabs 12 and on both sides of the up-down direction of the multiple tabs 12, so that the upper and lower surfaces of each tab 12 are directly electrically connected to the bus piece 20, and the flow area is increased.

In an embodiment of the present invention, as shown in fig. 19, an end portion of one axial end of the cell body 10 (for example, the upper end of the cell body 10 shown in fig. 10) is provided with a plurality of tab sets, the plurality of tab sets are arranged at intervals in a circumferential direction of the cell body 10, each tab set includes a plurality of layers of tabs 12 stacked in a radial direction of the cell body 10, the tabs 12 are provided with a die-cut shape, the die-cut shape is an improvement over a bending manner of a full tab 12, and the tabs 12 are cut along the radial direction of the cylindrical cell body 10 to form a fan shape as shown in fig. 1, so that, on one hand, each layer of the tabs 11 can be ensured to be electrically connected with the bus bar 20 through the tabs 12, and on the other hand, stacking of the tabs 12 caused during bending of the tabs 11 is avoided, which is beneficial to improving a problem of resistance increase.

In one embodiment of the present invention, as shown in fig. 6 to 13, the bus bar 20 is formed in a spiral shape extending in sequence in the lamination direction of the portion where the cell layers are connected to the bus bar 20, that is, the bus bar 20 is formed in a spiral shape, the direction in which the spiral extends being in the direction in which the plurality of cell layers are laminated (for example, the up-down direction in fig. 10 or the radial direction of the cell body 10 in fig. 1).

For example, referring to fig. 6, the bus bar 20 is formed in a spiral disk shape spirally extending from inside to outside in a radial direction of the cell body 10, and a plurality of bus bars 21 are respectively located between each adjacent tab 12 and at both sides of a lamination direction of the plurality of layers of tabs 12, thereby achieving direct electrical connection of each layer of tabs 12 with the bus bar 20.

As another example, referring to fig. 15, the bus bar 20 is formed into a spiral column shape extending spirally upward in the up-down direction, the bus bar 20 includes a plurality of bus portions 21 disposed in the up-down direction, tabs 12 are formed at the upper end of the cell body 10, the tabs 12 are bent perpendicular to the axis of the cell body 10 along the radial direction of the cell body 10, a plurality of layers of tabs 12 are stacked in the up-down direction, and the bus portions 21 are disposed between every two adjacent tabs 12 and on both sides of the plurality of tabs 12 in the up-down direction, so that the electrical connection between each tab 12 and the bus bar 20 is realized, and the flow area is increased.

In one embodiment of the present invention, as shown in fig. 6, the bus bar 20 is formed by winding a conductive filament, and the diameter of the conductive filament is in the range of 9 micrometers to 120 micrometers, that is, if the diameter of the conductive filament is a, then a is in the range of 9 micrometers to 120 micrometers. It should be noted that, when the diameter of the conductive wire is smaller than 9 micrometers, the surface area of the conductive wire is too small to facilitate the transmission of current between the pole pieces 11, and when the diameter of the conductive wire is larger than 120 micrometers, the gap between the adjacent tabs 12 is too large, which affects the normal use of the battery 100.

In a specific implementation process, the diameters of the conductive wires may be set to 9 micrometers, 20 micrometers, 31 micrometers, 42 micrometers, 53 micrometers, 64 micrometers, 75 micrometers, 66 micrometers, 77 micrometers, 88 micrometers, 99 micrometers, 110 micrometers and 120 micrometers according to actual conditions, for example, as shown in fig. 16, the diameters of the conductive wires are set to 66 micrometers, so that not only can the gap between adjacent tabs 12 not be too large be ensured, but also the current transmission between the multilayer tabs 12 and the bus bar 20 can be ensured to be stable.

In an embodiment of the present invention, as shown in fig. 4 and 5, the bus bar 20 is formed by winding a conductive sheet, a width direction of the conductive sheet is parallel to an extending direction of a portion of the cell layer connected to the bus bar 20, and if a width of the conductive sheet is less than or equal to 30 mm, that is, if a width of the conductive sheet is b (e.g., b shown in fig. 5 and 14), a value of b is less than or equal to 30 mm, and it should be noted that when the width of the conductive sheet is greater than 30 mm, tightness between the multilayer tabs 12 is affected, and stability of current transmission is affected.

In a specific implementation, the width of the conductive sheet may be set to 10 mm, 15 mm, 20 mm, 25 mm and 30 mm according to practical circumstances, for example, as shown in fig. 5, the width of the conductive sheet is set to 20 mm. This can ensure the stability of the current transmission between the multi-layered tab 12 and the bus bar 20.

In one embodiment of the present invention, as shown in fig. 20, the cell includes a composite current collector, which includes: a support insulating layer 111, and a first conductive layer 112 and a second conductive layer 113 covering both side surfaces of the support insulating layer 111 in a thickness direction, respectively. That is, the support insulating layer 111 is located between the first conductive layer 112 and the second conductive layer 113, and the first conductive layer 112 and the second conductive layer 113 are respectively covered on the upper surface and the lower surface of the support insulating layer 111.

Optionally, the supporting insulating layer 111 is a composite polymer insulating layer.

A battery 100 according to an embodiment of the present invention will be described with reference to fig. 1 and 10.

Referring to fig. 1, scheme one: the battery core body 10 is wound into a cylinder by one pole piece 11, the tabs 12 are connected to the upper axial end of the battery core body 10 and extend upwards in the axial direction of the battery core body 10, the confluence piece 20 is formed by a conductive wire with the diameter of 66 micrometers, the confluence piece 20 is formed into a spiral disc shape which spirally extends from inside to outside in the radial direction of the battery core body 10, confluence portions 21 are arranged between every two adjacent layers of tabs 12 and on two sides of the multilayer tabs 12 in the stacking direction, then two tightening pieces 40 are uniformly arranged in the circumferential direction of the confluence piece 20 at intervals and are clamped above the confluence piece 20 for further fixing the electric connection between the confluence piece 20 and the tabs 12, then the current collecting disc 30 is welded on the tightening piece 40, finally, the shell of the battery 100 is assembled, and the assembly of the battery 100 is completed.

Referring to fig. 10, scheme two: the battery cell body 10 is wound into a cylindrical shape by one pole piece 11, the wound pole piece 11 comprises a plurality of stacked core layers, the pole piece 11 forms a pole lug 12 at the upper end of the battery cell body 10, the pole lug 12 is arranged along the radial direction of the battery cell body 10 and faces to the axis of the battery cell body 10, the bus bar 20 is formed by a conducting strip with the width of 20 mm, the bus bar 20 is formed into a spiral column shape spirally extending in the vertical direction, a bus portion 21 is arranged between two adjacent pole lugs 12 and on two sides of the multilayer pole lugs 12 in the vertical direction, then a current collecting disc 30 is welded on the bus bar 20, finally the casing of the battery 100 is assembled, and the assembly of the battery 100 is completed.

According to the battery 100 of the utility model, the bus portions 21 are arranged between every two adjacent tabs 12 and on both sides of the plurality of tabs 12 in the stacking direction, so that both sides of each layer of tabs 12 can be directly and electrically connected with the bus piece 20, the flow area is increased, the current on-resistance is reduced, and the stability of electrical connection 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 present invention 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 (12)

1. A battery, comprising:

the battery cell comprises a battery cell body and a plurality of layers of electrode lugs which are connected to one axial end of the battery cell body and are arranged in a laminated mode;

the piece that converges, it includes a plurality of portions that converge, and is a plurality of to converge between the portion electricity is connected, every adjacent two-layer between the utmost point ear and multilayer the utmost point ear all is equipped with in the both sides of range upon range of direction portion that converges, and every converge the portion all with adjacent in range upon range of direction utmost point ear electricity is connected.

2. The battery of claim 1, further comprising: and the current collecting plate is arranged on one side of the current collecting piece, which is deviated from the battery core, and is electrically connected with the current collecting piece.

3. The battery of claim 1, wherein one end of the tab is connected to the cell body, and the other end of the tab extends outward away from the cell body along an axial direction of the cell body, multiple layers of the tab are stacked in a radial direction of the cell body, and multiple bus portions of the bus bar are sequentially arranged in the radial direction of the cell body.

4. The battery of claim 3, further comprising: a tightening member provided at one end of the cell body in an axial direction and configured to clamp the plurality of bus bar portions of the bus bar to the plurality of layers of the tabs in a radial direction of the bus bar.

5. The battery of claim 4, wherein the tightening member comprises: first baffle portion, second baffle portion and connecting plate portion, first baffle portion with the second baffle portion is located respectively converge the piece in the inside and outside both sides of radial direction, the connecting plate portion is followed the radial direction of converging the piece extends and both ends respectively with first baffle portion with the second baffle portion links to each other, tighten the piece with converge the piece and be in interference fit on the radial direction of converging the piece.

6. The battery according to claim 5, wherein the tightening member includes a plurality of tightening members that are provided at intervals in a circumferential direction of the bus bar member.

7. The battery of claim 1, wherein one end of the tab is connected to the cell body, and the other end of the tab is bent along a radial direction of the cell body, multiple layers of the tab are stacked in an axial direction of the cell body, and multiple bus portions of the bus bar are sequentially arranged in the axial direction of the cell body.

8. The battery of claim 7, wherein the end portion of the axial end of the cell body is provided with a plurality of pole lug groups, the plurality of pole lug groups are arranged at intervals in the circumferential direction of the cell body, and each pole lug group comprises a plurality of layers of pole lugs which are arranged in a stacked manner in the radial direction of the cell body.

9. The battery according to any one of claims 1 to 8, wherein the bus bar is formed in a spiral shape that extends in sequence in a stacking direction of a portion where a core layer is connected to the bus bar.

10. The battery of claim 9, wherein the bus bar is formed by winding a conductive filament having a diameter in the range of 9 to 120 microns.

11. The battery of claim 9, wherein the bus bar is formed by winding a conductive sheet, a width direction of the conductive sheet is parallel to an extending direction of a portion of the core layer connected to the bus bar, and a width of the conductive sheet is 30 mm or less.

12. The battery of any of claims 1-8, wherein the cell comprises a composite current collector comprising: the first conductive layer and the second conductive layer are respectively covered on the two side surfaces of the supporting insulating layer in the thickness direction.

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