CN217641441U

CN217641441U - Battery cell winding pole group structure with step-shaped characteristics

Info

Publication number: CN217641441U
Application number: CN202220460437.3U
Authority: CN
Inventors: 李令; 李可
Original assignee: Chongqing Zijian Electronic Co ltd
Current assignee: Chongqing Zijian Electronic Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-10-21
Anticipated expiration: 2032-03-03

Abstract

The utility model provides an electric core winding pole group structure with step-shaped characteristics, which comprises an electric core body, wherein the electric core body comprises a positive plate, a negative plate and a diaphragm; the upper side end and/or the lower side end of the positive plate are/is provided with a plurality of first step surfaces with gradually reduced heights along the length direction of the positive plate in sequence; the upper side end and/or the lower side end of the negative plate are/is sequentially provided with a plurality of second step surfaces with decreasing heights and corresponding to the plurality of first step surfaces along the length direction of the negative plate; the positive plate, the negative plate and the diaphragm are wound with each other to form the battery cell body with steps. The utility model discloses make electric core have certain size gap distribution on winding structure, and then alleviate the core of coiling of winding form to a certain extent because the structural limitation that the processing procedure factor received.

Description

Battery cell winding pole group structure with step-shaped characteristics

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to electric core coiling utmost point group structure of utensil step form characteristic.

Background

In the manufacturing process of the battery core, two forms of lamination and winding are mainly adopted at the present stage. The winding form refers to that in the manufacturing process, a positive pole piece and a negative pole piece which form the battery core and an isolating film between the positive pole piece and the negative pole piece rotate and wind around a solid rotating shaft (namely a winding needle) in a space to form a pole piece-diaphragm combination (namely a pole group). Due to the presence of the rotating shaft, the wound form cells are more limited in appearance than the laminated form. As customer needs develop, the size of the battery slot on the device increasingly becomes larger and more a nonstandard column is represented by occupation of other elements. Under the requirement, the original common elliptic cylinder battery cell cannot completely utilize the battery cell space in many times, so that the design disadvantage is provided.

SUMMERY OF THE UTILITY MODEL

To prior art's defect, the utility model provides an electricity core coiling utmost point group structure of step form characteristic makes electric core have certain size difference distribution on winding structure, and then alleviates the roll core of coiling form to a certain extent because the structural constraint that the processing procedure factor received.

The utility model provides an electric core winding pole group structure with step-shaped characteristics, which comprises an electric core body, wherein the electric core body comprises a positive plate, a negative plate and a diaphragm;

the upper side end and/or the lower side end of the positive plate are/is provided with a plurality of first step surfaces with gradually reduced heights along the length direction of the positive plate in sequence;

the upper side end and/or the lower side end of the negative plate are/is sequentially provided with a plurality of second step surfaces with decreasing heights and corresponding to the plurality of first step surfaces along the length direction of the negative plate;

the positive plate, the negative plate and the diaphragm are wound with each other to form the battery cell body with steps.

In the above technical solution, the utility model discloses can also do following improvement.

The preferable technical scheme is characterized in that: the positive plate comprises a positive foil, and a plurality of first step surfaces with progressively reduced heights are sequentially arranged at the upper end and/or the lower end of the positive foil along the length direction of the positive foil.

The preferable technical scheme is characterized in that: the left side end of the positive foil is a blank foil, and the left side end of the positive foil is provided with a positive electrode lug.

The preferable technical scheme is characterized in that: the first step surface is a blank foil along the length direction of the first step surface.

The preferable technical scheme is characterized in that: and a positive powder layer is arranged on one side surface of the positive foil except the blank foil.

The preferable technical scheme is characterized in that: the negative pole piece includes the negative pole foil, the upper end and/or the lower extreme of negative pole foil are followed the length of negative pole foil is to the direction being equipped with the degressive second step face of several height in proper order.

The preferable technical scheme is characterized in that: the left side end of the negative electrode foil is a blank foil, and the left side end of the negative electrode foil is provided with a negative electrode tab.

The preferable technical scheme is characterized in that: and a negative electrode powder layer is arranged on one side surface of the negative electrode foil except the blank foil.

The preferable technical scheme is characterized in that: the upper end of anodal utmost point ear and negative pole utmost point ear all is equipped with the welding area, the welding area along the left side and/or the outside extension in right side of anodal utmost point ear and negative pole utmost point ear, the welding area with anodal utmost point ear or negative pole utmost point ear adopt ultrasonic bonding, the welding area is close to one side of anodal utmost point ear or negative pole utmost point ear is arranged and is equipped with several fusing hole.

The preferable technical scheme is characterized in that: the upper ends of the positive electrode lug and the negative electrode lug are respectively provided with a heat conducting fin positioned below the welding belt, the left side end and/or the right side end of the heat conducting fin are/is provided with a heat radiating fin, and the heat radiating fin is provided with a plurality of fins.

The utility model has the advantages that: the utility model discloses a set up out first step face and second step face, make electric core have certain size difference and distribute in winding structure, and then alleviate the book core of coiling form to a certain extent because the structural constraint that the processing procedure factor received, widened the utmost point group structure kind that the coiling form can realize, also provided the scheme of a preparation unconventional appearance structure electricity core simultaneously.

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 embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural diagram of a cell winding pole group structure with step-like features according to embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of the positive electrode sheet according to embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of the negative electrode sheet of example 1 of the present invention.

Fig. 4 is a schematic structural diagram of a cell winding pole group structure with step-like features according to embodiment 2 of the present invention.

Fig. 5 is a schematic structural view of a positive electrode sheet according to embodiment 2 of the present invention.

Fig. 6 is a schematic structural view of a negative electrode sheet according to embodiment 2 of the present invention.

Fig. 7 is a schematic structural view of a positive electrode tab according to embodiment 3 of the present invention.

Fig. 8 is a schematic structural view of a heat sink according to embodiment 3 of the present invention.

In the figure, the respective symbols have the following meanings:

1. a positive plate; 11. a positive foil; 111. a first step surface; 12. a positive electrode tab; 13. a positive electrode powder layer; 2. a negative plate; 21. a negative foil; 211. a second step surface; 22. a negative electrode tab; 23. a negative electrode powder layer; 3, welding the belt; 4. a heat conductive sheet; 5. a heat sink; 6. and a fin.

Detailed Description

To further understand the contents, features and functions of the present invention, the following embodiments are illustrated and described in detail as follows:

example 1

Referring to fig. 1 to fig. 3, the present embodiment provides a cell winding electrode group structure with a step-shaped feature, including a cell body, where the cell body includes a positive electrode sheet 1, a negative electrode sheet 2, and a separator;

the upper side end of the positive plate 1 is sequentially provided with a plurality of first step surfaces 111 with progressively decreasing heights along the length direction of the positive plate 1;

a plurality of second step surfaces 211 with decreasing heights and corresponding to the plurality of first step surfaces 111 are sequentially arranged at the upper side end of the negative electrode sheet 2 along the length direction of the negative electrode sheet 2;

the positive plate 1, the negative plate 2 and the diaphragm are wound with each other to form the battery cell body with steps.

In the embodiment, the plurality of first step surfaces 111 with degressive height are arranged on the positive plate 1, and the plurality of second step surfaces 211 with degressive height are arranged on the negative plate 2, so that the positive plate 1, the negative plate 2 and the diaphragm are wound to form the electric core body with steps.

As can be seen from fig. 1 to 3, when a plurality of first step surfaces 111 with decreasing heights are provided on the upper side of the positive electrode sheet 1, and a plurality of second step surfaces 211 with decreasing heights are provided on the upper side of the negative electrode sheet 2, the cell body formed by final winding is tapered.

Referring to fig. 2, the positive plate 1 includes a positive foil 11, and a plurality of first step surfaces 111 with decreasing heights are sequentially disposed at an upper side end of the positive foil 11 along a longitudinal direction of the positive foil 11.

The positive foil 11 is a basic part of the positive plate 1 and is used for subsequent winding with the diaphragm.

Referring to fig. 2, the left side end of the positive foil 11 is a blank foil, and the left side end of the positive foil 11 is provided with a positive tab 12.

A positive tab 12 is provided for connection to an external electrical component.

Referring to fig. 2, a portion of the first step surface 111 along a longitudinal direction of the first step surface 111 is a blank foil.

Referring to fig. 2, a positive electrode powder layer 13 is disposed on a side of the positive electrode foil 11 except the blank foil.

Referring to fig. 3, the negative electrode sheet 2 includes a negative electrode foil 21, and a plurality of second step surfaces 211 with decreasing heights are sequentially disposed at an upper end of the negative electrode foil 21 along a longitudinal direction of the negative electrode foil.

The negative foil 21 is provided as a base member of the negative electrode sheet 2 for subsequent winding with the separator.

Referring to fig. 3, the left side of the negative foil 21 is a blank foil, and the left side of the negative foil 21 is provided with a negative tab 22.

A negative tab 22 is provided for connection to an external electrical component.

Referring to fig. 3, a negative electrode powder layer 23 is disposed on one side of the negative electrode foil 21 except the blank foil.

Example 2

Referring to fig. 4 to 6, the present embodiment is different from embodiment 1 in that: the upper side end and the lower side end of the positive plate 1 are sequentially provided with a plurality of first step surfaces 111 with progressively decreasing heights along the length direction of the positive plate 1;

a plurality of second step surfaces 211 with decreasing heights and corresponding to the plurality of first step surfaces 111 are sequentially arranged at the upper side end and the lower side end of the negative electrode sheet 2 along the length direction of the negative electrode sheet 2;

As can be seen from fig. 4 to 6, when a plurality of first step surfaces 111 with decreasing heights are symmetrically arranged on both the upper side and the lower side of the positive electrode plate 1, and second step surfaces 211 with decreasing heights are symmetrically arranged on both the upper side and the lower side of the negative electrode plate 2, the finally wound battery cell body is spindle-shaped.

Referring to fig. 5, the positive plate 1 includes a positive foil 11, and a plurality of first step surfaces 111 with decreasing heights are sequentially disposed on the upper side end and the lower side end of the positive foil 11 along the longitudinal direction of the positive foil 11.

Referring to fig. 6, the negative electrode sheet 2 includes a negative electrode foil 21, and a plurality of second step surfaces 211 with decreasing heights are sequentially disposed on an upper side end and a lower side end of the negative electrode foil 21 along a longitudinal direction of the negative electrode foil 21.

Example 3

Referring to fig. 7 to 8, the present embodiment is different from embodiment 1 or 2 in that: anodal utmost point ear 12 and negative pole utmost point ear 22's upper end all is equipped with weld area 3, weld area 3 along anodal utmost point ear 12 and negative pole utmost point ear 22's left side and right side outwards extend, weld area 3 with anodal utmost point ear 12 or negative pole utmost point ear 22 adopt ultrasonic bonding, weld area 3 is close to anodal utmost point ear 12 or negative pole utmost point ear 22's one side is arranged and is equipped with several fusing hole.

Referring to fig. 7 to 8, the upper ends of the positive electrode tab 12 and the negative electrode tab 22 are respectively provided with a heat conducting fin 4 located below the welding strip 3, the left side end and the right side end of the heat conducting fin 4 are respectively provided with a heat dissipating fin 5, and the heat dissipating fin 5 is provided with a plurality of fins 6.

Through setting up welding area 3, welding area 3 welds with anodal utmost point ear 12 or the conduction band welding of negative pole utmost point ear 22, when the battery takes place the short circuit, the inside heavy current in the twinkling of an eye that produces of battery, and welding area 3 can be fused, and the fusing hole of setting can make welding area 3 in time fused.

Through setting up conducting strip 4 and fin 5, can derive the heat that utmost point ear structure produced when the short circuit detects fast, effectively reduced the risk that catches fire when the short circuit detects for laminate polymer battery is safer when the short circuit detects, thereby makes laminate polymer battery safer when using.

The fins 6 are arranged in a plurality and are arranged on the radiating fin 5 in parallel, and the fins 6 are used for increasing the radiating area.

In the description of the present invention, it is to be understood that the terms "center", "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 indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

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 limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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 invention. 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. Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A battery cell winding pole group structure with step-shaped characteristics comprises a battery cell body, wherein the battery cell body comprises a positive plate, a negative plate and a diaphragm; the method is characterized in that:

the positive plate, the negative plate and the diaphragm are wound mutually to form the battery cell body with steps.

2. The cell winding pole group structure with step-like features as claimed in claim 1, wherein: the positive plate comprises a positive foil, and the upper end and/or the lower end of the positive foil are/is provided with a plurality of first step surfaces with decreasing heights along the length direction of the positive foil in sequence.

3. The cell winding pole group structure with step-like features as claimed in claim 2, wherein: the left side end of the positive foil is a blank foil, and the left side end of the positive foil is provided with a positive electrode lug.

4. The cell winding pole group structure with step-like features as claimed in claim 2, wherein: the first step surface is a blank foil along the length direction of the first step surface.

5. The cell winding pole group structure with step-like features as claimed in claim 3, wherein: and a positive powder layer is arranged on one side surface of the positive foil except the blank foil.

6. The cell winding pole group structure with step-like features of claim 5, wherein: the negative plate comprises a negative foil, and a plurality of second step surfaces with progressively decreased heights are sequentially arranged at the upper side end and/or the lower side end of the negative foil along the length direction of the negative foil.

7. The cell winding pole group structure with step-like feature of claim 6, wherein: the left side end of the negative electrode foil is a blank foil, and the left side end of the negative electrode foil is provided with a negative electrode tab.

8. The cell winding pole group structure with step-like features of claim 7, wherein: and a negative electrode powder layer is arranged on one side surface of the negative electrode foil except the blank foil.

9. The cell winding pole group structure with step-like features of claim 7, wherein: the upper end of anodal utmost point ear and negative pole utmost point ear all is equipped with the welding area, the welding area along the left side and/or the outside extension in right side of anodal utmost point ear and negative pole utmost point ear, the welding area with anodal utmost point ear or negative pole utmost point ear adopt ultrasonic bonding, the welding area is close to one side of anodal utmost point ear or negative pole utmost point ear is arranged and is equipped with several fusing hole.

10. The cell winding pole group structure with step-like features of claim 9, wherein: the upper ends of the positive electrode lug and the negative electrode lug are respectively provided with a heat conducting fin positioned below the welding belt, the left side end and/or the right side end of the heat conducting fin are/is provided with a heat radiating fin, and the heat radiating fin is provided with a plurality of fins.