CN216563275U

CN216563275U - Lithium battery roll core structure

Info

Publication number: CN216563275U
Application number: CN202122686794.XU
Authority: CN
Inventors: 罗敬; 陈国栋; 余志�; 于子龙; 王传宝; 陈杰
Original assignee: Dongguan Liwinon Energy Technology Co ltd
Current assignee: Dongguan Liwinon Energy Technology Co ltd
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-05-17
Anticipated expiration: 2031-11-04

Abstract

The utility model belongs to the technical field of lithium batteries, and particularly discloses a lithium battery roll core structure which comprises an anode plate, a cathode plate and a diaphragm, wherein the anode plate, the cathode plate and the diaphragm are sequentially wound into a bare cell, the length of the anode plate is greater than that of the cathode plate, the number of winding turns of the cathode plate is a, the number of winding turns of the anode plate is b, and the number of winding turns a of the cathode plate and the number of winding turns b of the anode plate satisfy the following relational expression: a < b < a +1, wherein a >1 and b >1, and insulating glue is attached to the area of the cathode pole piece beyond the anode pole piece during winding. The core structure of rolling up of pole piece is optimized, reaches the purpose that balanced anode plate overflows, can effectively reduce the battery end and make an uproar and reduce a roll core diameter, can not only promote user experience, can also promote energy density, increase duration.

Description

Lithium battery roll core structure

Technical Field

The utility model belongs to the technical field of lithium batteries, and particularly relates to a lithium battery roll core structure.

Background

In recent years, wearable devices have been rapidly developed and diversified in forms such as watches, wristbands, TWS headphones, and the like. During 2020 and 2021, the development speed of wearable technology is particularly obvious, and the wearable technology is more and more popular, and higher requirements are also put forward on matched batteries. Soft-pack button cells have become the first power source for TWS headsets due to their powerful advantages. At present, most TWS earphones adopt a soft package button cell as a power supply, when equipment is started, the instantaneous current is overlarge, and a cathode pole and an anode pole generate an induction magnetic field to generate electromagnetic interference on the earphones, so that high noise is generated.

The soft-package button cell of market mainstream all adopts conventional coiling structure at present, produces bluetooth search signal electric current in the twinkling of an eye after the circular telegram, has initialization pulse current, and the negative and positive pole piece is different because length is different and current direction, and it is different to produce the induction field direction, and the negative and positive pole signal can't offset, produces the residual signal, leads to electromagnetic pulse signal to produce electromagnetic interference to the earphone coil to reduce user and use experience.

SUMMERY OF THE UTILITY MODEL

One of the objects of the present invention is: to the not enough of prior art existence, provide a lithium cell and rolled up core structure, it not only reduces the end noise effect, promotes user experience, can also reduce battery size, promotes electric core energy density.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a lithium battery roll core structure, includes anode plate, cathode plate and diaphragm, anode plate cathode plate with the diaphragm is convoluteed into naked electric core in proper order, anode plate's length is greater than cathode plate's length, cathode plate's the number of turns of coiling is an, anode plate's the number of turns of coiling is b, cathode plate's the number of turns of coiling an with satisfy following relational expression between anode plate's the number of turns of coiling b:

a<b<a+1

and a is greater than 1, b is greater than 1, and insulating glue is attached to the region of the cathode pole piece, which exceeds the anode pole piece, during winding.

Furthermore, one end of the anode pole piece is provided with a first tab, one end of the cathode pole piece is provided with a second tab, the first tab and the second tab are arranged at 90 degrees, and the number of winding turns of the anode pole piece is 3/4 more than that of the cathode pole piece.

Furthermore, one end of the anode pole piece is provided with a first tab, one end of the cathode pole piece is provided with a second tab, the first tab and the second tab are arranged at 90 degrees, and the number of winding turns of the anode pole piece is 1/4 more than that of the cathode pole piece.

Further, the anode plate is made of copper foil, and the cathode plate is made of aluminum foil.

The second purpose of the utility model is: aiming at the defects in the prior art, the lithium battery roll core structure comprises an anode piece, a cathode piece and a diaphragm, wherein the anode piece, the cathode piece and the diaphragm are sequentially wound into a bare cell, the length of the anode piece is less than or equal to that of the cathode piece, the number of winding turns of the cathode piece is a, the number of winding turns of the anode piece is b, and the number of winding turns of the cathode piece a and the number of winding turns of the anode piece b satisfy the following relational expression:

1<b≤a

Furthermore, one end of the anode pole piece is provided with a first tab, one end of the cathode pole piece is provided with a second tab, the first tab and the second tab are arranged in 180 degrees, and the number of winding turns of the anode pole piece is equal to that of the cathode pole piece.

Furthermore, one end of the anode pole piece is provided with a first tab, one end of the cathode pole piece is provided with a second tab, the first tab and the second tab are arranged in an angle of 180 degrees, and the number of winding turns of the anode pole piece is 1 turn less than that of the cathode pole piece.

The utility model has the beneficial effects that:

1. the core structure of rolling up of pole piece is optimized, reaches the purpose that balanced anode plate overflows, can effectively reduce the battery end and make an uproar and reduce a roll core diameter, can not only promote user experience, can also promote energy density, increase duration.

2. The region of the cathode pole piece beyond the anode pole piece is attached with the insulating glue, so that the electromagnetic effect can be relieved, the noise of the battery cell can be reduced, the noise reduction effect is achieved, the energy density of the battery can be ensured, and the performance of the battery cell meets the production requirement.

Drawings

Fig. 1 is a winding schematic diagram of a lithium battery roll core structure in embodiment 1 of the present invention;

fig. 2 is a winding schematic diagram of a lithium battery roll core structure in embodiment 2 of the present invention;

fig. 3 is a winding schematic diagram of a lithium battery roll core structure in embodiment 3 of the present invention;

fig. 4 is a winding schematic diagram of a lithium battery roll core structure in embodiment 4 of the utility model.

Wherein: 1. an anode plate; 11. a first tab; 2. a cathode plate; 21. and a second tab.

Detailed Description

In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; 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 in specific cases to those skilled in the art.

The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example 1

As shown in fig. 1, this embodiment 1 provides a core structure is rolled up to lithium cell, including anode plate 1, cathode plate 2 and diaphragm, anode plate 1, cathode plate 2 and diaphragm are convoluteed into naked electric core in proper order, and the length of anode plate 1 is greater than the length of cathode plate 2, and the number of turns of coiling of cathode plate 2 is a, and the number of turns of coiling of anode plate 1 is b, satisfies the following relational expression between the number of turns of coiling a of cathode plate 2 and the number of turns of coiling b of anode plate 1:

a<b<a+1

where a >1, b >1, and in this embodiment 1, b-a is 3/4, that is, the number of winding turns of the anode tab 1 is 3/4 more than that of the cathode tab 2. Specifically, the anode plate 1 is a copper foil, and the cathode plate 2 is an aluminum foil, in this embodiment 1, the lithium battery roll core structure adopts a copper foil ending manner, and the anode plate 1 covers the cathode plate 2.

In addition, 1 one end of positive pole piece is provided with first

utmost point ear

11, and 2 one ends of negative pole piece are provided with second utmost point ear 21, and first utmost point ear 11 is located the right side of rolling up the core, and second utmost point ear 21 is located the upper end of rolling up the core, is 90 settings between first utmost point ear 11 and the second utmost point ear 21.

Example 2

As shown in fig. 2, unlike example 1, in the lithium battery winding core structure provided in this example 2, the following relation is satisfied between the number of winding turns a of the cathode sheet 2 and the number of winding turns b of the anode sheet 1:

b-a＝1/4

that is, the number of winding turns of the anode plate 1 is 1/4 more than that of the cathode plate 2, the first tab 11 is located on the left side of the winding core, the second tab 21 is located on the upper end of the winding core, and the first tab 11 and the second tab 21 are arranged at 90 degrees.

In addition, when winding, the region of the cathode pole piece 2 beyond the anode pole piece 1 is adhered with insulating glue, so that the electromagnetic effect can be relieved, and the noise of the battery cell is reduced.

The other structures are the same as those of embodiment 1, and are not described herein again.

Example 3

As shown in fig. 3, different from embodiment 1, this embodiment 3 provides a core structure of a lithium battery, including an anode plate 1, a cathode plate 2, and a diaphragm, where the anode plate 1, the cathode plate 2, and the diaphragm are sequentially wound into a bare cell, the length of the anode plate 1 is less than or equal to the length of the cathode plate 2, the number of winding turns of the cathode plate 2 is a, the number of winding turns of the anode plate 1 is b, and the number of winding turns a of the cathode plate 2 and the number of winding turns b of the anode plate 1 satisfy the following relation:

1<b≤a

wherein a is more than 1, b is more than 1, and during winding, the area of the cathode pole piece 2, which exceeds the anode pole piece 1, is adhered with insulating glue.

In this embodiment 3, a is b, i.e. the number of windings of the anode sheet 1 is equal to the number of windings of the cathode sheet 2. Specifically, the anode plate 1 is a copper foil, the cathode plate 2 is an aluminum foil, and in this embodiment 1, the lithium battery roll core structure adopts a copper foil ending manner.

Specifically, 1 one end of positive pole piece is provided with first

utmost point ear

11, and 2 one ends of negative pole piece are provided with second utmost point ear 21, and first utmost point ear 11 is located the lower extreme of rolling up the core, and second utmost point ear 21 is located the upper end of rolling up the core, is 180 settings between first utmost point ear 11 and the second utmost point ear 21.

Specifically, the lithium battery roll core structure provided by this embodiment 3 adopts the mode of copper foil ending.

In addition, during winding, the area of the cathode pole piece 2 beyond the anode pole piece 1 is adhered with insulating glue. And the electromagnetic effect is relieved, and the noise of the battery cell is reduced.

Example 4

As shown in fig. 4, unlike embodiment 3, in the lithium battery roll core structure provided in embodiment 4, the following relationship is satisfied between the number of winding turns a of the cathode sheet 2 and the number of winding turns b of the anode sheet 1:

a-b＝1

that is, the number of winding turns of the anode plate 1 is 1 less than that of the cathode plate 2, the first tab 11 is located at the lower end of the winding core, the second tab 21 is located at the upper end of the winding core, and the first tab 11 and the second tab 21 are arranged at an angle of 180 degrees.

Specifically, this embodiment 4 provides a lithium battery roll core structure, it adopts the mode of aluminium foil ending.

The other structures are the same as those of embodiment 3, and are not described herein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.

Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, substitutions or alterations based on the present invention will fall within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. The utility model provides a lithium cell roll core structure which characterized in that: including anode plate (1), cathode pole piece (2) and diaphragm, anode plate (1) cathode pole piece (2) with the diaphragm is convoluteed into naked electric core in proper order, the length of anode plate (1) is greater than the length of cathode pole piece (2), the number of turns of convoluteing of cathode pole piece (2) is a, the number of turns of convoluteing of anode pole piece (1) is b, the number of turns of convoluteing a of cathode pole piece (2) with satisfy following relational expression between the number of turns of convoluteing b of anode pole piece (1):

a<b<a+1

and a is greater than 1, b is greater than 1, and an insulating adhesive is attached to the region of the cathode pole piece (2) beyond the anode pole piece (1) during winding.

2. The lithium battery jelly roll structure of claim 1, wherein: anode plate (1) one end is provided with first utmost point ear (11), cathode plate (2) one end is provided with second utmost point ear (21), first utmost point ear (11) with second utmost point ear (21) are 90 settings, the number of turns of convoluteing of anode plate (1) is compared 3/4 circles are more than the number of turns of convoluteing of cathode plate (2).

3. The lithium battery jelly roll structure of claim 1, wherein: anode plate (1) one end is provided with first utmost point ear (11), cathode plate (2) one end is provided with second utmost point ear (21), first utmost point ear (11) with second utmost point ear (21) are 90 settings, the number of turns of convoluteing of anode plate (1) is compared 1/4 circles are more than the number of turns of convoluteing of cathode plate (2).

4. The lithium battery jelly roll structure of claim 1, wherein: the anode plate (1) is made of copper foil, and the cathode plate (2) is made of aluminum foil.

5. The lithium battery jelly roll structure of claim 1, wherein: the utility model provides a lithium cell roll core structure which characterized in that: including anode plate (1), cathode pole piece (2) and diaphragm, anode plate (1) cathode pole piece (2) with the diaphragm is convoluteed into naked electric core in proper order, the length of anode plate (1) is less than or equal to the length of cathode pole piece (2), the number of turns of convoluteing of cathode pole piece (2) is a, the number of turns of convoluteing of anode pole piece (1) is b, the number of turns of convoluteing a of cathode pole piece (2) with satisfy following relational expression between the number of turns of convoluteing b of anode pole piece (1):

1<b≤a

6. The lithium battery jelly roll structure according to claim 5, wherein: the battery is characterized in that one end of the anode pole piece (1) is provided with a first pole lug (11), one end of the cathode pole piece (2) is provided with a second pole lug (21), the first pole lug (11) and the second pole lug (21) are arranged by 180 degrees, and the number of winding turns of the anode pole piece (1) is equal to that of the cathode pole piece (2).

7. The lithium battery jelly roll structure of claim 5, wherein: the utility model discloses a lithium battery, including positive pole piece (1), negative pole piece (2), first utmost point ear (11) are provided with to positive pole piece (1) one end, negative pole piece (2) one end is provided with second utmost point ear (21), first utmost point ear (11) with second utmost point ear (21) are 180 settings, the number of turns of convoluteing of positive pole piece (1) is compared the number of turns of convoluteing of negative pole piece (2) is little 1 circle.

8. The lithium battery jelly roll structure of claim 5, wherein: the anode plate (1) is made of copper foil, and the cathode plate (2) is made of aluminum foil.