CN217182241U

CN217182241U - Cylindrical battery

Info

Publication number: CN217182241U
Application number: CN202220809328.8U
Authority: CN
Inventors: 程乾龙; 薛历兴; 岳治崇; 梁永吉; 张阔
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-08-12
Anticipated expiration: 2032-04-08

Abstract

The utility model provides a cylindrical battery, including cylinder casing, anode cover plate, negative pole apron and full utmost point ear book core, full utmost point ear book core embedding is in the cylinder casing, and anode cover plate and negative pole apron fixed mounting are at the relative both ends of cylinder casing, and anode cover plate and negative pole apron are connected with the utmost point ear electricity at full utmost point ear book core both ends respectively, full utmost point ear book core includes an interior electric core and at least one outer electric core, and interior electric core and outer electric core are from inside to outside in proper order coaxial cover establish and form cylindric full utmost point ear book core. The utility model discloses a cylindrical battery is through rolling up the core segmentation with full utmost point ear and convoluteing and overlap respectively and establish to reduced the disability rate of the pole piece of the core is rolled up to the full utmost point ear, reduction in production cost.

Description

Cylindrical battery

Technical Field

The utility model relates to a power battery technical field especially relates to a cylinder battery.

Background

The cylindrical battery mainly comprises a winding core, a shell material and a current collector structure, and the main technical problem is that the quality and the yield of the winding core are difficult to control, the winding core of the cylindrical battery is generally formed by one-time winding, specifically, a pole piece is cut into sections, then the sections of the pole piece are wound by a winding machine to form the winding core, the pole piece at the central position has larger curvature in the winding process of the pole piece, so the pole piece is easier to break, the compaction density of the pole piece at the central position is generally reduced in order to avoid the breakage, but the compaction density of the cut pole piece is generally kept consistent, so the breakage problem at the central position is difficult to overcome from the perspective of large-scale production, and the local winding process of the pole piece is unqualified in the winding process, no matter the central breakage or the middle winding process is unqualified, the whole pole piece section is scrapped, so that the scrappage of the pole piece section is not controlled conveniently.

In view of this, how to reduce the scrap rate of the pole pieces of the cylindrical battery becomes a technical problem to be solved urgently in the field.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a structural design is more reasonable, can effectively reduce the cylinder battery of pole piece disability rate.

The technical scheme of the utility model is realized like this: the utility model provides a cylindrical battery, it includes: the cylindrical shell, the positive cover plate, the negative cover plate and the full lug roll up the core, and the full lug rolls up the core embedding in the cylindrical shell, and positive cover plate and negative cover plate fixed mounting are at the relative both ends of cylindrical shell, and positive cover plate and negative cover plate are connected with the utmost point ear electricity at full lug roll core both ends respectively, full lug rolls up the core and includes electric core and at least one outer electric core in one, and interior electric core and outer electric core are from inside to outside in proper order coaxial cover establish and form cylindric full lug roll core.

On the basis of the technical scheme, the diameter of the inner battery core is preferably 14-16 mm.

On the basis of the technical scheme, preferably, the distance between the inner electric core and the adjacent outer electric core is 0.1-0.5 mm.

On the basis of the technical scheme, preferably, the distance between two adjacent outer battery cores is 0.1-0.5 mm.

Still further preferably, the positive electrode material of the inner battery core is lithium iron phosphate, and the compacted density of the positive electrode plate is 2.0-2.3g/cm 3.

On the basis of the above technical solution, preferably, the number of the outer electric cores is three.

On the basis of the technical scheme, preferably, a plurality of first bulges are formed on one surface, close to the full-lug winding core, of the positive cover plate along the radial direction, and the first bulges are arranged in a circumferential array mode around the circle center of the positive cover plate.

On the basis of above technical scheme, preferably, on the basis of above technical scheme, the negative pole apron forms a plurality of second archs along radial direction near the one side of full utmost point ear book core, and a plurality of second archs are the circumference array around the centre of a circle of negative pole apron and arrange.

The utility model discloses following beneficial effect has for prior art:

(1) the utility model provides a cylindrical battery, this cylindrical battery adopts the nested electric core of multilayer to constitute the core part of the whole utmost point ear book, compares the conventional integrative winding core that forms, and split type book core can be formed by adopting the pole piece winding that multistage length is shorter, therefore when the flaw position that appears the same quantity, the pole piece of multistage probably only need scrap one of them part, therefore the pole piece disability rate reduces;

(2) secondly, because the inner electric core and the outer electric core are formed by winding a plurality of sections of pole pieces, the pole pieces in different sections can adopt different compaction densities, so that the problem of winding fracture caused by the fact that the compaction densities cannot meet the winding curvature requirement under the condition of different winding curvatures can be avoided as much as possible, and the rejection rate of the pole pieces is further reduced;

(3) because the nested formation of a plurality of electric cores has been adopted, consequently in order to improve the electric connection effect of utmost point ear between a plurality of electric cores, be provided with protruding structure on the apron that corresponds, utilize the arch to improve the welding firmness between apron and the utmost point ear.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an isometric view of a cylindrical battery of the present invention;

fig. 2 is an exploded view of the cylindrical battery of the present invention;

fig. 3 is an exploded view of another view of the cylindrical battery of the present invention.

In the figure: 1-cylindrical shell, 2-positive cover plate, 3-negative cover plate, 4-full-lug winding core, 21-first bulge, 31-second bulge, 41-inner cell and 42-outer cell.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1, combine fig. 2-3, the utility model discloses a cylindrical battery, it includes cylindrical shell 1, positive pole cover plate 2, negative pole cover plate 3 and full utmost point ear book core 4, wherein full utmost point ear book core 4 embedding is in cylindrical shell 1, positive

pole cover plate

2 and 3 fixed mounting at the relative both ends of cylindrical shell 1 of negative pole cover plate, and positive pole cover plate 2 and negative pole cover plate 3 are connected with the utmost point ear electricity at full utmost point ear book core 4 both ends respectively, full utmost point ear book core 4 includes an interior electric core 41 and at least one outer electric core 42, interior electric core 41 is established with one or more outer electric core 42 from inside to outside coaxial bushing in proper order to form cylindric full utmost point ear book core 4.

When the number of the outer electric cores 42 is multiple, the multiple outer electric cores 42 are nested in sequence from inside to outside, so as to form a plurality of coaxial cylindrical structures, one inner electric core 41 is embedded in the inner side of the innermost outer electric core 42, each electric core is of a full-lug structure, and the full tabs are respectively located at two ends along the axial direction, the inner cell 41 and the outer cell 42 are formed by winding pole pieces, electrode materials are attached to the surfaces of the pole pieces, formed by coating, drying and compacting, the pole piece of the inner cell 41 has a greater curvature of bending during winding, and therefore, which is more prone to breakage problems, and to avoid this technical problem, the surface of the inner cell 41 may be coated with less electrode material, or a lower compaction density, to avoid electrode material breaking the pole pieces during winding, and so on, the closer to the inner outer core 42, the greater its winding curvature, the lower the corresponding compacted density of the electrode material may be than the outer ring outer core 42 surface electrode material; secondly, because at least one interior electric core 41 and one outer electric core 42 constitute, corresponding, the pole piece of coiling includes two sections at least, compares one section pole piece coiling shaping, and when the pole piece total length is the same, if a flaw point appears, the technical scheme of this embodiment only need scrap one of them section pole piece can, compare one section pole piece of prior art, the disability rate is lower, when the pole piece segmentation number is bigger, the pole piece scrap probability is littleer.

In a specific embodiment, the diameter of the inner cell 41 is 14-16 mm.

In the above embodiment, after the diameter of the inner cell 41 exceeds 15cm, the winding curvature of the inner cell is not changed greatly, so that the probability of damage to the following pole pieces is basically the same, and when the number of pole piece segments is too large, the production process and the assembly process are more complicated, so that in order to reduce the difficulty of winding the pole piece with the largest removal rate as much as possible and reduce the rejection rate, the inner cell 41 can be formed by winding once, and the diameter is between 14 cm and 16cm, and the winding curvature corresponding to the subsequent outer cell 42 tends to be unchanged, so that the corresponding winding difficulty is reduced, and therefore, the inner cell can be wound separately or in segments.

In a specific embodiment, the distance between the inner electric core 41 and the adjacent outer electric core 42 is 0.1-0.5 mm.

In order to ensure the convenience of assembling the battery cell bracket as much as possible and improve the energy density of the battery cell, the gap is more reasonable to be set to be 0.1-0.5mm through verification.

In a specific embodiment, the distance between two adjacent outer cells 42 is 0.1-0.5 mm.

In a specific embodiment, the positive electrode material of the inner cell 41 is lithium iron phosphate, and the compacted density of the positive electrode sheet is 2.0-2.3g/cm 3.

In the above embodiment, the positive electrode material of the inner cell is lithium iron phosphate, and the winding rejection rate of the inner cell 41 is low with the compaction density.

In a particular embodiment, the number of outer cells 42 is three.

In the above embodiment, when the number of the outer cells 42 is too large, the assembly process of the cells is more complicated, the types of the cells are more unfavorable for reducing the production cost, and when the number of the cells is too small, the rejection rate of the pole pieces of the wound cells is difficult to control, preferably, when the number of the outer cells 42 is three, the rejection rate can be reduced, and good production cost control can be maintained.

As shown in fig. 3, in a specific embodiment, a plurality of first protrusions 21 are formed on one surface of the positive cover plate 2 close to the full-tab winding core 4 in the radial direction, and the plurality of first protrusions 21 are arranged in a circumferential array around the center of the positive cover plate 2.

In the above embodiment, the first protrusion 21 can enhance the connection effect between the positive electrode cover plate 2 and the tab of the full-tab winding core 4.

As shown in fig. 2, in a specific embodiment, a plurality of second protrusions 31 are formed on one surface of the negative cover plate 3 close to the full-tab winding core 4 in the radial direction, and the plurality of second protrusions 31 are arranged in a circumferential array around the center of the negative cover plate 3.

In the above embodiment, the second protrusions 31 can enhance the coupling effect between the negative electrode lid plate 3 and the tab of the full-tab winding core 4.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a cylindrical battery, its characterized in that, includes that cylindrical shell (1), anodal apron (2), negative pole apron (3) and full utmost point ear roll up core (4), and full utmost point ear roll up core (4) embedding in cylindrical shell (1), and anodal apron (2) and negative pole apron (3) fixed mounting are at the both ends that cylindrical shell (1) is relative, and anodal apron (2) and negative pole apron (3) are connected with the utmost point ear electricity at full utmost point ear roll core (4) both ends respectively, full utmost point ear roll core (4) are including an interior electric core (41) and at least one outer electric core (42), and interior electric core (41) and outer electric core (42) are from inside to outside in proper order coaxial cover to establish cylindric full utmost point ear roll core (4).

2. The cylindrical battery according to claim 1, wherein the diameter of the inner cell (41) is 14-16 mm.

3. Cylindrical battery according to claim 1, characterized in that the spacing between an inner cell (41) and an adjacent outer cell (42) is 0.1-0.5 mm.

4. The cylindrical battery according to claim 1, wherein the distance between two adjacent outer cells (42) is 0.1-0.5 mm.

5. The cylindrical battery according to claim 1, wherein the positive side of the inner cell (41)The pole material is lithium iron phosphate, and the compacted density of the positive plate is 2.0-2.3g/cm ³ 。

6. The cylindrical battery according to claim 1, characterized in that the number of outer cells (42) is three.

7. The cylindrical battery according to claim 1, wherein a plurality of first protrusions (21) are formed on one surface of the positive cover plate (2) close to the full-tab winding core (4) along the radial direction, and the plurality of first protrusions (21) are arranged in a circumferential array around the center of the positive cover plate (2).

8. The cylindrical battery according to claim 1, wherein a plurality of second protrusions (31) are formed on one surface of the negative cover plate (3) close to the full-tab winding core (4) along the radial direction, and the plurality of second protrusions (31) are arranged in a circumferential array around the center of the negative cover plate (3).