CN217035738U

CN217035738U - Battery cell and battery

Info

Publication number: CN217035738U
Application number: CN202123252172.2U
Authority: CN
Inventors: 李洋; 胡本安; 安建; 张登学
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-07-22
Anticipated expiration: 2031-12-22

Abstract

The utility model discloses an electric core and a battery, wherein the electric core comprises: the battery cell comprises a battery cell body, wherein the battery cell body is wound, the battery cell body is provided with a first bending part and a second bending part along the winding direction, the outer side of the battery cell body is provided with a tail winding part, one end of the tail winding part is connected with the tail end of the second bending part, and the other end of the tail winding part is flush with the head end of the first bending part; reduce the thickness difference of electric core in the final phase department, improve the roughness of electric core to prevent that the final phase of electric core from being in the appearance of long circulation back lithium precipitation super thick problem, prolong the life of electric core, improve the safety in utilization of electric core.

Description

Battery cell and battery

Technical Field

The utility model relates to the technical field of lithium ion battery cell manufacturing, in particular to a battery cell and a battery.

Background

At present, lithium ion battery cells are commonly used, and with the coming of the 5G era, the capacity of a mobile phone to the cells is higher and higher, the charging rate is higher and higher, and the safety performance requirement is higher and higher; the safety performance of the conventional lithium battery is still insufficient at present, and the danger of fire and explosion still exists under some extreme use conditions; in order to improve the safety and reliability of the battery cell, the aluminum-anode short circuit can be prevented by coating lithium iron phosphate on an aluminum foil at present, and green glue is adopted for ending in the winding process; this structure can furthest reduce the empty aluminium foil that does not receive the protection in the electric core, reduces the possibility of electric core short circuit to further improve the security performance of electric core, but this structure can bring some other problems, and it is more obvious that the thickness difference of electric core ending position thickness and other positions is wherein more outstanding is, and interface contact is relatively poor, thereby influences the long-term circulation performance of electric core.

SUMMERY OF THE UTILITY MODEL

One of the objects of the present invention is: the utility model provides an electricity core has solved among the prior art more obvious technical problem of thickness difference of electric core ending position thickness and other positions, has realized improving the thickness difference problem of electric core ending department.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a cell, comprising:

the electric core body, the setting is convoluteed to the electric core body, the electric core body is provided with first kink and second kink along the direction of convoluteing, the outside of electric core body is provided with receipts afterbody, the one end of receiving the afterbody with the trailing end connection of second kink, the other end of receiving the afterbody with the head end parallel and level of first kink.

The utility model relates to an improvement of a battery cell, wherein a battery cell body comprises a positive plate, and a tail end part is arranged on the positive plate.

According to the improvement of the battery cell, the negative plate comprises a positive current collector and a first active material layer and a second active material layer which are respectively arranged on two sides of the positive current collector.

According to the improvement of the battery cell, the first active material layer comprises a first bottom layer and a first lithium cobalt oxide layer, and the second active material layer comprises a second bottom layer and a second lithium cobalt oxide layer;

the first bottom layer is arranged between the positive current collector and the first lithium cobalt oxide layer, and the second bottom layer is arranged between the positive current collector and the second lithium cobalt oxide layer.

According to the improvement of the battery cell, a first ceramic layer is arranged between the first bottom layer and the first lithium cobalt oxide layer, and the first ceramic layer is positioned at the tail end of the positive plate;

and a second ceramic layer is arranged between the second bottom layer and the second lithium cobalt oxide layer and is positioned at the tail end of the positive plate.

According to the improvement of the battery cell, the thickness of the first ceramic layer is larger than that of the second ceramic layer.

According to the improvement of the battery cell, the battery cell body further comprises a negative plate and a diaphragm arranged between the positive plate and the negative plate.

According to the improvement of the battery cell, the negative plate comprises a negative current collector, and a third active material layer and a fourth active material layer which are respectively arranged on two sides of the negative current collector.

According to the improvement of the battery cell, a first groove is formed in the negative pole piece, and a negative pole lug is arranged on the first groove;

and a second groove is formed in the positive plate, and a positive lug is arranged on the second groove.

Another object of the present invention is: there is provided a battery comprising a housing and a cell as hereinbefore described encapsulated within the housing.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides an electric core, setting through electric core body, electric core body is provided with first kink and second kink along the direction of coiling, electric core body's the outside is provided with receives the afterbody, the one end of receiving the afterbody and the trailing end connection of second kink, the other end of receiving the afterbody and the head end parallel and level of first kink, thereby adjust the ending department of electric core, it is poor to reduce the thickness of electric core in ending department, improve the roughness of electric core, thereby prevent that the ending of electric core is in the appearance of long circulation back lithium precipitation super-thick problem, the life of extension electric core, the safety in utilization of electric core is improved.

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

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, and 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 a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of a point a in fig. 1.

Fig. 3 is a schematic view of the structure of the positive electrode sheet of the present invention.

Fig. 4 is a second schematic structural diagram of the positive electrode sheet of the present invention.

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

Fig. 6 is a second schematic structural diagram of the negative electrode sheet according to the present invention.

Reference numerals are as follows: 1. a cell body; 2. a first bent portion; 3. a second bent portion; 4. collecting the tail part; 5. a positive plate; 6. a positive current collector; 7. a first active material layer; 8. a second active material layer; 9. a first bottom layer; 10. a first lithium cobalt oxide layer; 11. a second bottom layer; 12. a second lithium cobalt oxide layer; 13. a first ceramic layer; 14. a second ceramic layer; 15. a negative plate; 16. a diaphragm; 17. a negative current collector; 18. a third active material layer; 19. a fourth active material layer; 20. a first groove; 21. a positive tab; 22. a second groove; 23. and a negative tab.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1 to 6, an electrical core includes an electrical core body 1, the electrical core body 1 is wound, the electrical core body 1 is provided with a first bending portion 2 and a second bending portion 3 along a winding direction, an end portion 4 is provided outside the electrical core body 1, one end of the end portion 4 is connected to a tail end of the second bending portion 3, and the other end of the end portion 4 is flush with a head end of the first bending portion 2.

Compared with the prior art, this embodiment electric core, setting through electric core body 1, electric core body 1 is provided with first kink 2 and second kink 3 along the coiling direction, electric core body 1's the outside is provided with receipts afterbody 4, the trailing end connection of the one end of ending 4 and second kink 3, the other end of ending 4 and the head end parallel and level of first kink 2, thereby adjust the ending department of electric core, reduce the thickness difference of electric core in ending department, improve the roughness of electric core, thereby prevent that the ending of electric core is in the appearance of long circulation back analysis lithium ultrathick problem, prolong the life of electric core, improve the safety in utilization of electric core.

In this embodiment, the battery cell body 1 includes a positive plate 5, and the tail portion 4 is disposed on the positive plate 5; through the setting of positive plate 5, receipts afterbody 4 sets up on positive plate 5, and the effectual thickness that improves electric core in the department of ending is poor, improves the roughness of electric core to prevent that the ending of electric core from being in the appearance of long circulation back lithium analysis super-thick problem.

In the present embodiment, the positive electrode sheet 5 includes a positive electrode current collector 6, and a first active material layer 7 and a second active material layer 8 respectively provided on both sides of the positive electrode current collector 6; through the cooperation use of the positive electrode current collector 6, the first active material layer 7 and the second active material layer 8 are respectively arranged on two sides of the positive electrode current collector 6, so that the positive electrode sheet 5 is formed.

In the present embodiment, the first active material layer 7 includes a first underlayer 9, a first lithium cobalt oxide layer 10, and the second active material layer 8 includes a second underlayer 11, a second lithium cobalt oxide layer 12; the first bottom layer 9 is arranged between the positive current collector 6 and the first lithium cobalt oxide layer 10, and the second bottom layer 11 is arranged between the positive current collector 6 and the second lithium cobalt oxide layer 12; through the cooperation on first bottom 9, first lithium cobalt oxide layer 10, second bottom 11, second lithium cobalt oxide layer 12, first bottom 9 sets up between anodal mass flow body 6 and first lithium cobalt oxide layer 10, second bottom 11 sets up between anodal mass flow body 6 and second lithium cobalt oxide layer 12, first lithium cobalt oxide layer 10, second lithium cobalt oxide layer 12 can effectually restrain electric core polarization, reduce the fuel factor, improve the multiplying power performance.

In the present embodiment, a first ceramic layer 13 is disposed between first underlayer 9 and first lithium cobalt oxide layer 10, and first ceramic layer 13 is located at the tail end of positive electrode sheet 5; a second ceramic layer 14 is arranged between the second bottom layer 11 and the second lithium cobalt oxide layer 12, and the second ceramic layer 14 is positioned at the tail end of the positive plate 5; through the setting of first ceramic layer 13, second ceramic layer 14, first ceramic layer 13, second ceramic layer 14 all set up in the tail end of positive plate 5, and the effectual cyclicity ability that improves electric core improves the safety in utilization of electric core.

In the present embodiment, the thickness of first ceramic layer 13 is greater than the thickness of second ceramic layer 14; through the thickness setting of first ceramic layer 13, second ceramic layer 14, the thickness of first ceramic layer 13 is greater than the thickness of second ceramic layer 14, and further improvement electric core is poor at the thickness of ending department, and further prevent that electric core is here in the appearance of long cycle back lithium analysis super thick problem.

In this embodiment, the battery cell body 1 further includes a negative electrode sheet 15 and a separator 16 disposed between the negative electrode sheet 15 and the positive electrode sheet 5; through the setting of negative pole piece 15, diaphragm 16 sets up between negative pole piece 15 and positive plate 5, and effectual isolation negative pole piece 15 and positive plate 5 prevent that the short circuit from taking place for the electric core.

In the present embodiment, the negative electrode sheet 15 includes a negative electrode collector 17 and third and fourth active material layers 18 and 19 respectively provided on both sides of the negative electrode collector 17; by the provision of the negative electrode current collector 17, the third active material layer 18, and the fourth active material layer 19, the third active material layer 18 and the fourth active material layer 19 are respectively provided on both sides of the negative electrode current collector 17, thereby forming the negative electrode sheet 15.

In the embodiment, the positive plate 5 is provided with a first groove 20, and the first groove 20 is provided with a positive tab 21; a second groove 22 is formed in the negative plate 15, and a negative tab 23 is arranged on the second groove 22; through the setting of first recess 20, second recess 22, first recess 20 sets up on positive plate 5, and positive tab 21 sets up in first recess 20, and second recess 22 sets up on negative pole piece 15, and negative tab 23 sets up in second recess 22, and effectual realization is to the equipment of positive plate 5, negative pole piece 15.

Example two

A battery comprises a shell and the battery cell of the first embodiment, wherein the battery cell is packaged in the shell.

Compared with the prior art, this embodiment battery, through the setting of shell and embodiment one's electric core, electric core encapsulates in the shell, and effectual realization is less to the equipment of battery, and simultaneously, the final phase of a project thickness difference of electric core is less to prevent that the final phase of a project of electric core from being in the appearance of long circulation back lithium analysis super-thick problem, the bloated probability takes place for effectual reduction battery, and then improves the safety in utilization of battery.

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.

Claims

1. A battery cell, comprising:

the battery cell comprises a battery cell body, the battery cell body is wound and arranged, the battery cell body is provided with a first bending part and a second bending part along the winding direction, the outer side of the battery cell body is provided with a winding tail part, one end of the winding tail part is connected with the tail end of the second bending part, the other end of the winding tail part is flush with the head end of the first bending part, the battery cell body comprises a positive plate, and the winding tail part is arranged on the positive plate.

2. The electrical core of claim 1, wherein the positive electrode sheet comprises a positive electrode current collector and a first active material layer and a second active material layer respectively disposed on two sides of the positive electrode current collector.

3. The electrical core of claim 2, wherein the first active material layer comprises a first substrate layer and a first lithium cobalt oxide layer, and the second active material layer comprises a second substrate layer and a second lithium cobalt oxide layer;

4. The cell of claim 3, wherein a first ceramic layer is disposed between the first bottom layer and the first lithium cobalt oxide layer, and the first ceramic layer is located at the tail end of the positive plate;

5. The electrical core of claim 4, wherein the first ceramic layer has a thickness greater than a thickness of the second ceramic layer.

6. The electrical core of claim 1, wherein the electrical core body further comprises a negative electrode sheet and a separator disposed between the positive electrode sheet and the negative electrode sheet.

7. The cell of claim 6, wherein the negative electrode sheet comprises a negative electrode current collector and a third active material layer and a fourth active material layer respectively disposed on two sides of the negative electrode current collector.

8. The electrical core according to claim 6, wherein a first groove is formed in the positive electrode sheet, and a positive electrode tab is disposed on the first groove;

and a second groove is formed in the negative plate, and a negative lug is arranged on the second groove.

9. A battery comprising a housing and the cell of any of claims 1-8, wherein the cell is encapsulated within the housing.