CN214123917U

CN214123917U - Lithium-copper composite lithium belt with carbon fiber mesh conductive framework

Info

Publication number: CN214123917U
Application number: CN202120150133.2U
Authority: CN
Inventors: 秦蕾; 王潇; 王华云
Original assignee: Chengdu Denway Newtype Metal Material Co ltd
Current assignee: Chengdu Denway Newtype Metal Material Co ltd
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-09-03
Anticipated expiration: 2031-01-20

Abstract

The utility model discloses a lithium-copper composite lithium belt with a carbon fiber mesh conductive framework, which comprises a lithium belt (1) and a copper foil (3), and is characterized in that the lithium belt (1) is embedded with a conductive framework (2); the conductive framework (2) is provided with n embedded grooves (6), and the copper foil (3) is arranged in the embedded grooves (6); and the lithium belt (1), the conductive framework (2) and the copper foil (3) are sprayed with a conductive film (4). The utility model discloses a set up electrically conductive skeleton on the lithium area, and with n piece copper foil embedding electrically conductive skeleton in n embedded groove, and with two adjacent copper foils through the linking arm of electrically conductive skeleton connection, can both effectually improve the hardness in whole compound lithium area, can improve the conductivity in whole compound lithium area again, thereby the utility model discloses fine solution the problem that the conductivity in compound lithium area has reduced behind the increase copper foil among the prior art.

Description

Lithium-copper composite lithium belt with carbon fiber mesh conductive framework

Technical Field

The utility model relates to a lithium-copper composite lithium area specifically indicates a lithium-copper composite lithium area with carbon fiber net electrically conductive skeleton.

Background

The lithium belt is a belt-shaped lithium extruded by a lithium ingot, and because the lithium metal is soft and has low specific strength, the problem that the negative electrode made of a self-supporting ultrathin lithium belt faces difficult processing in the lithium battery is solved, the deformation, the folding and even the breakage of the lithium belt can be easily caused no matter in the process of winding the ultrathin lithium belt and a positive plate together into a battery or in the process of cutting the ultrathin lithium belt into small pieces and then laminating the small pieces into the battery, and the breakage of the joint of the lug and the ultrathin lithium belt can be more easily caused in the process of connecting the lug with the ultrathin lithium belt and completing the packaging. In order to solve this problem, researchers in the lithium ribbon production industry and the battery production industry have developed metal composite lithium ribbons that can enhance the hardness of lithium ribbons. For example, the inventor of the high Tianjin Lishi battery has developed a lithium copper composite foil, and the chinese patent application with the publication number of CN107819104A discloses the lithium copper composite foil is formed by sandwiching a copper foil between lithium metal foils, so as to solve the problem that a single lithium ribbon is easy to cause deformation, folding and even cracking of the lithium ribbon.

However, although the lithium copper composite foil solves the problem of easily causing deformation, wrinkling and even cracking of the lithium ribbon, the conductivity of the lithium ribbon is affected, resulting in a great reduction in the energy density of the entire battery. Therefore, it is urgent to provide a composite lithium ribbon which can improve the hardness of the lithium ribbon and ensure the electrical conductivity of the lithium ribbon.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve above-mentioned problem, provide one kind and can improve lithium area hardness, can ensure the lithium complex area of lithium complex area's whole electric conductivity's lithium copper complex area that has the electrically conductive skeleton of carbon fiber net again.

The purpose of the utility model is realized through the following technical scheme: a lithium-copper composite lithium belt with a carbon fiber mesh conductive framework comprises a lithium belt and a copper foil, wherein the conductive framework is embedded on the lithium belt; the conductive framework is provided with n embedded grooves, and the copper foil is arranged in the embedded grooves; and the lithium belt, the conductive framework and the copper foil are sprayed with a conductive film.

Furthermore, a groove is formed in the lithium belt along the length direction, and the conductive framework is embedded into the groove; the size of the groove is matched with the conductive framework.

The n embedded grooves are arranged along the length direction of the conductive framework, and the two adjacent embedded grooves are connected through a connecting arm of the conductive framework.

Furthermore, the number of the copper foils is the same as that of the embedded grooves, the number of the copper foils is n, wherein n is more than or equal to 1, and one copper foil is embedded into each embedded groove; the size of the copper foil is matched with the embedded groove.

Furthermore, the conductive film is an indium tin oxide conductive film coating, the thickness of the conductive film is 0.03mm, and the heat shrinkage rate MD is less than or equal to 0.8 percent and the TD is less than or equal to 0.6 percent.

In order to better improve the conductive effect, the conductive framework is a carbon fiber net layer with the thickness of 0.07 mm; the thickness of the lithium tape is 0.1 mm.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

(1) the utility model discloses a set up electrically conductive skeleton on the lithium area, and with n piece copper foil embedding electrically conductive skeleton in n embedded groove, and with two adjacent copper foils through the linking arm of electrically conductive skeleton connection, can both effectually improve the hardness in whole compound lithium area, can improve the conductivity in whole compound lithium area again, thereby the utility model discloses fine solution the problem that the conductivity in compound lithium area has reduced behind the increase copper foil among the prior art.

(2) The utility model discloses a conductive film that sprays on lithium area and electrically conductive skeleton and copper foil both can improve lithium area and electrically conductive skeleton electrically conductive effect, can prevent again that electrically conductive skeleton from coming off from the lithium area and preventing that the copper foil from coming off from electrically conductive skeleton.

Drawings

Fig. 1 is an overall structure diagram of the present invention.

Fig. 2 is a side sectional view of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is a schematic structural view of the conductive framework of the present invention.

Fig. 5 is a schematic structural view of the lithium ribbon of the present invention.

The reference numbers in the above figures refer to: the solar cell comprises 1-a lithium strip, 2-a conductive framework, 3-copper foil, 4-a conductive film, 5-a groove and 6-an embedded groove.

Detailed Description

The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.

Examples

As shown in FIGS. 1-5, the utility model discloses a lithium copper complex lithium area with carbon fiber net conductive framework, including lithium area 1, copper foil 3 to and conductive framework 2.

Specifically, the lithium ribbon 1 is set to 0.1mm in this example. The conductive skeleton 2 is embedded in the lithium ribbon 1. In order to ensure the electric conduction effect of the electric conduction framework 2, the electric conduction framework 2 in the embodiment is preferably implemented by adopting a carbon fiber mesh layer with the thickness of 0.07mm, and the carbon fiber mesh layer has good electric conduction and heat conduction effects. In order to facilitate the embedding of the conductive skeleton 2, as shown in fig. 5, a groove 5 is formed in the lithium ribbon 1 along the length direction, and the conductive skeleton 2 is embedded in the groove 5. The size of recess 5 and electrically conductive skeleton 2 adaptation to ensure that electrically conductive skeleton 2 imbeds the lithium area 1 after, through extrusion equipment extrusion back and lithium area 1 solid as an organic whole, and make the face of putting on the shelf of electrically conductive skeleton 2 and the area face of lithium area 1 be in on the same horizontal plane. As shown in fig. 4, n embedded grooves 6 are provided on the conductive skeleton 2, and the copper foil 3 is placed in the embedded grooves 6. Wherein, n embedded groove 6 sets up along the length direction of electrically conductive skeleton 2, and two adjacent embedded groove 6 are connected through the linking arm of electrically conductive skeleton 2.

In this embodiment, with n piece copper foil 3 embedding conductive framework 2 n embedded groove 6 in, and with two adjacent copper foils 3 through conductive framework 2's linking arm connection, can both effectually improve the hardness in whole compound lithium area, can improve the conductivity in whole compound lithium area again, thereby the utility model discloses fine solution the problem that the conductivity in compound lithium area has reduced behind the copper foil among the prior art.

Further, the number of the copper foils 3 is the same as that of the embedded grooves 6, and the number of the copper foils 3 is also n, wherein n in the embodiment is more than or equal to 1, and one copper foil 3 is embedded in each embedded groove 6. The size of copper foil 3 and embedded groove 6 adaptation to ensure that copper foil 3 is solid as an organic whole with electrically conductive skeleton 2 after through extrusion equipment extrusion, and make the face of putting on the shelf of electrically conductive skeleton 2 and the foil face of copper foil 3 be in on the same horizontal plane.

Still further, as shown in fig. 2 and 3, a conductive film 4 is sprayed on the lithium ribbon and the conductive skeleton 2 and the copper foil 3. In the embodiment, the conductive film 4 is preferably an indium tin oxide conductive film coating, the thickness of the conductive film 4 is 0.03mm, and the thermal shrinkage ratio MD is less than or equal to 0.8% and TD is less than or equal to 0.6%. This conductive film 4 both can improve lithium area 1 and the 2 conductibility of electrically conductive skeleton, can prevent again that electrically conductive skeleton 2 from droing from lithium area 1 in compound lithium area rolling or battery production, simultaneously, still prevents that copper foil 3 from droing from electrically conductive skeleton 2 in compound lithium area rolling or battery production to the effectual result of use of having ensured the utility model.

As described above, the utility model discloses alright fine realization.

Claims

1. A lithium-copper composite lithium belt with a carbon fiber mesh conductive framework comprises a lithium belt (1) and a copper foil (3), and is characterized in that the lithium belt (1) is embedded with the conductive framework (2); the conductive framework (2) is provided with n embedded grooves (6), and the copper foil (3) is arranged in the embedded grooves (6); and the lithium belt (1), the conductive framework (2) and the copper foil (3) are sprayed with a conductive film (4).

2. The lithium-copper composite lithium belt with the carbon fiber mesh conductive skeleton is characterized in that the lithium belt (1) is provided with a groove (5) along the length direction, and the conductive skeleton (2) is embedded in the groove (5); the size of the groove (5) is matched with the conductive framework (2).

3. The lithium-copper composite lithium belt with the carbon fiber mesh conductive framework is characterized in that the n embedded grooves (6) are arranged along the length direction of the conductive framework (2), and two adjacent embedded grooves (6) are connected through a connecting arm of the conductive framework (2).

4. The lithium-copper composite lithium belt with the carbon fiber mesh conductive framework is characterized in that the number of the copper foils (3) is the same as that of the embedded grooves (6), the number of the copper foils (3) is also n, wherein n is more than or equal to 1, and one copper foil (3) is embedded in each embedded groove (6); the size of the copper foil (3) is matched with that of the embedded groove (6).

5. The lithium-copper composite lithium strip with the carbon fiber mesh conductive framework is characterized in that the conductive film (4) is an indium tin oxide conductive film coating, the thickness of the conductive film (4) is 0.03mm, and the thermal shrinkage rate MD is less than or equal to 0.8 percent and the TD is less than or equal to 0.6 percent.

6. The lithium-copper composite lithium belt with a carbon fiber mesh conductive skeleton according to claim 5, characterized in that the conductive skeleton (2) is a carbon fiber mesh layer with a thickness of 0.07 mm; the thickness of the lithium strip (1) is 0.1 mm.