CN212907803U

CN212907803U - Lithium ion battery with high-rate charge and discharge

Info

Publication number: CN212907803U
Application number: CN202021658987.3U
Authority: CN
Inventors: 李华锋; 张习林
Original assignee: Dongguan Juhe New Energy Co ltd
Current assignee: Dongguan Juhe New Energy Co ltd
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2021-04-06
Anticipated expiration: 2030-08-11

Abstract

The utility model discloses a lithium ion battery of high magnification charge-discharge, including positive plate, negative pole piece, casing, diaphragm and electrolyte, including positive plate and negative pole piece and electrolyte in the casing, the positive plate surface is provided with anodal active material, the positive plate surface at positive active material middle part is provided with anodal ear welded position, negative pole piece surface is provided with negative pole active material, the negative pole piece surface at negative pole active material middle part is provided with negative pole ear welded position. The conductive carbon black, the carbon nanotubes and the graphene are added in the positive electrode material layer of the high-rate charge-discharge lithium ion battery, and a multi-angle conductive network is formed in the positive electrode material layer, so that lithium ions can be rapidly embedded or separated from multiple directions in the rapid charge-discharge process of the battery, and therefore the battery can be charged to more than 85% of electric quantity in 10 minutes of rapid charge, and the rapid discharge is 25C rate discharge and can be discharged continuously for more than 4 minutes.

Description

Lithium ion battery with high-rate charge and discharge

Technical Field

The utility model relates to a lithium ion battery technical field specifically is a lithium ion battery of high magnification charge-discharge.

Background

The lithium ion battery has the advantages of high energy density, small self-discharge, long service life and the like; in recent years, fields such as electric tools, electric vehicles, and aerial photography have been developed. At present, people have higher and higher requirements on the charging time of the lithium-ion battery, namely, the shorter the charging time is, the better the charging time is.

At the present stage, lithium ion batteries with fast charge and slow discharge are produced in small batches, but the lithium ion batteries with fast charge and fast discharge are still in the research and development stage, the lithium ion batteries with fast charge is charged at 5C, more than 85% of electricity is charged in 12 minutes of constant current charge, and the lithium ion batteries with fast discharge, namely 25C discharge, are continuously discharged for 4 minutes. Therefore, the utility model provides a lithium ion battery of high magnification charge-discharge solves the above-mentioned technological problem that proposes.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lithium ion battery of high magnification charge-discharge to solve the problem that proposes in the background art.

In order to achieve the above object, the present invention provides a lithium ion battery with high-rate charge and discharge, which comprises a positive plate, a positive tab welding position, an aluminum foil, a positive active material, a negative plate, a negative tab welding position, a copper foil, a negative active material, a shell, a diaphragm and an electrolyte, wherein the positive plate, the negative plate and the electrolyte are arranged in the shell, the shell is made of an aluminum-plastic composite film, the positive plate is provided with the positive active material on the surface, the positive tab welding position is arranged on the surface, the aluminum foil is arranged on the surface, the negative active material is arranged on the surface, the negative tab welding position is arranged on the surface, the negative active material surface is arranged on the surface, the negative, the lithium cobaltate lithium ion battery comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate adopts lithium cobaltate as a main material, the negative plate adopts artificial graphite as a main material, the designed capacity of the lithium cobaltate of the positive plate is 140mAh/g, the designed capacity of the graphite of the negative plate is 320mAh/g, the negative mass of the negative plate is 10% more than that of the positive plate, the particle size D50 of the lithium cobaltate of the positive plate is controlled to be 6 +/-1 mu m, the particle size D50 of the graphite of the negative plate is controlled to be 9 +/-1 mu m, the diaphragm is arranged between the positive plate and the negative plate, and the diaphragm is of a porous PP/PE.

Preferably, the positive plate and the negative plate adopt a mode of pole ear outlet at the middle position, and are manufactured through the working procedures of winding, assembling, injecting liquid, forming, vacuum secondary sealing and the like.

Preferably, the ratio of the thickness of the negative electrode plate to the thickness of the positive electrode plate is 1: 1.2.

Compared with the prior art, the beneficial effects of the utility model are that: the conductive carbon black, the carbon nanotubes and the graphene are added in the positive electrode material layer of the high-rate charge-discharge lithium ion battery, and a multi-angle conductive network is formed in the positive electrode material layer, so that lithium ions can be rapidly embedded or separated from multiple directions in the rapid charge-discharge process of the battery, and therefore the battery can be charged to more than 85% of electric quantity in 10 minutes of rapid charge, and the rapid discharge is 25C rate discharge and can be discharged continuously for more than 4 minutes.

Drawings

Fig. 1 is a schematic structural view of a positive plate of the present invention;

fig. 2 is a schematic structural view of the negative plate of the present invention;

fig. 3 is a schematic diagram of the internal structure of the battery of the present invention.

In the figure: 1. the anode plate, 2, the anode tab welding position, 3, the aluminum foil, 4, the anode active material, 5, the cathode plate, 6, the cathode tab welding position, 7, the copper foil, 8, the cathode active material, 9, the shell, 10, the diaphragm, 11 and the electrolyte.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in 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 belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a lithium ion battery with high-rate charge and discharge comprises a positive plate 1, a positive tab welding position 2, an aluminum foil 3, a positive active material 4, a negative plate 5, a negative tab welding position 6, a copper foil 7, a negative active material 8, a shell 9, a diaphragm 10 and an electrolyte 11, wherein the shell 9 comprises the positive plate 1, the negative plate 5 and the electrolyte 11, the shell 9 is formed by an aluminum-plastic composite film, the surface of the positive plate 1 is provided with the positive active material 4, the surface of the positive plate 1 in the middle of the positive active material 4 is provided with the positive tab welding position 2, the surface of the positive active material 4 below the positive tab welding position 2 is provided with the aluminum foil 3, the surface of the negative plate 5 is provided with the negative active material 8, the surface of the negative plate 5 in the middle of the negative active material 8 is provided with the negative tab welding position 6, and the surface of the negative active material 8 below, the positive plate 1 is prepared by adopting lithium cobaltate as a main material, conductive carbon black Super P, a conductive carbon nanotube CNT, a binder PVDF and an NMP solvent according to the following proportion through the working procedures of vacuum stirring, coating, rolling and tabletting: lithium cobaltate: 95.5% conductive carbon black Super P: 1.5% conductive carbon nanotubes CNT: 1%, graphene 0.5%, binder PVDF: 1.5 percent, the negative plate 5 is made by adopting artificial graphite as a main material, conducting carbon black Super P, a thickening agent CMC, a binder SBR and purified water according to the following proportion through the processes of vacuum stirring, coating, rolling and sheet making, the lithium cobaltate design capacity of the positive plate 1 is 140mAh/g, the graphite design capacity of the negative plate 5 is 320mAh/g, the negative mass of the negative plate 5 is 10 percent more than that of the positive plate 1, the particle diameter D50 of the lithium cobaltate of the positive plate 1 is controlled to be 6 +/-1 mu m, the graphite particle diameter D50 of the negative plate 5 is controlled to be 9 +/-1 mu m, a diaphragm 10 is arranged between the positive plate 1 and the negative plate 5, the diaphragm 10 is arranged to be a porous PP/PE/PP structure, the porosity is controlled to be within the range of 44 +/-2 percent, the lithium ions can be smoothly inserted or removed through the diaphragm during rapid charging and discharging, the lithium salt of the electrolyte is conventional LiPF6 without, the conductivity is controlled within the range of 10.5 +/-0.5 ms/cm;

the pole piece structures of the positive pole piece 1 and the negative pole piece 5 adopt a mode of pole ear outlet at the middle position and are manufactured through the working procedures of winding, assembling, liquid injection, formation, vacuum secondary sealing and the like; the ratio of the thickness of the negative electrode sheet 5 to the thickness of the positive electrode sheet 1 is 1: 1.2.

The working principle is as follows: before the lithium ion battery with high-rate charge and discharge is used, the whole battery needs to be known in a simple structure, wherein the positive electrode consists of an aluminum foil and positive electrode material layers on two side surfaces of the aluminum foil, and the positive electrode material layers consist of a lithium cobaltate main material, conductive carbon black Super P, a conductive carbon nanotube CNT, graphene and a binder PVDF (polyvinylidene fluoride) which are mixed; the lithium cobaltate is prepared from the following components in percentage by weight: 95.5% conductive carbon black Super P: 1.5% conductive carbon nanotubes CNT: 1%, graphene 0.5%, binder PVDF: 1.5 percent;

the negative electrode is composed of copper foil and negative electrode material layers on two side surfaces of the copper foil, wherein the negative electrode material layer is formed by mixing an artificial graphite main material, conductive carbon black Super P, a thickening agent CMC and a binder SBR; the composition proportion is graphite: 94.7% conductive carbon black Super P: 2% thickener CMC: 1.5%, binder SBR: 1.8 percent;

the positive and negative electrode materials are subjected to vacuum stirring, coating, rolling and sheet making according to the proportion to manufacture positive and negative electrode plates, and in order to reduce the ohmic internal resistance of the electrode, the positive and negative electrode plates adopt a mode of leading out positive and negative electrode lugs in the middle as shown in the attached figures 1 and 2 of the specification.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a lithium ion battery of high magnification charge-discharge, includes positive plate (1), anodal ear welded position (2), aluminium foil (3), anodal active material (4), negative pole piece (5), negative pole ear welded position (6), copper foil (7), negative pole active material (8), casing (9), diaphragm (10) and electrolyte (11), its characterized in that: the lithium ion battery is characterized in that the shell (9) comprises a positive plate (1), a negative plate (5) and electrolyte (11), the shell (9) is formed by an aluminum-plastic composite film, a positive active material (4) is arranged on the surface of the positive plate (1), a positive tab welding position (2) is arranged on the surface of the positive plate (1) in the middle of the positive active material (4), aluminum foil (3) is arranged on the surface of the positive active material (4) below the positive tab welding position (2), a negative active material (8) is arranged on the surface of the negative plate (5), a negative tab welding position (6) is arranged on the surface of the negative plate (5) in the middle of the negative active material (8), copper foil (7) is arranged on the surface of the negative active material (8) below the negative tab welding position (6), the positive plate (1) adopts lithium cobaltate as a main material, and the negative plate (5) adopts artificial graphite as a main material, the design capacity of lithium cobaltate of the positive plate (1) is 140mAh/g, the design capacity of graphite of the negative plate (5) is 320mAh/g, the mass of the negative electrode of the negative plate (5) is 10% more than that of the positive plate (1), the particle size D50 of the lithium cobaltate of the positive plate (1) is controlled to be 6 +/-1 mu m, the particle size D50 of the graphite of the negative plate (5) is controlled to be 9 +/-1 mu m, a diaphragm (10) is arranged between the positive plate (1) and the negative plate (5), and the diaphragm (10) is set to be a porous PP/PE/PP structure.

2. The lithium ion battery with high-rate charge and discharge according to claim 1, characterized in that: the pole piece structure of the positive pole piece (1) and the negative pole piece (5) adopts a mode of pole ear outlet at the middle position and is manufactured through the working procedures of winding, assembling, liquid injection, formation, vacuum secondary sealing and the like.

3. The lithium ion battery with high-rate charge and discharge according to claim 1, characterized in that: the thickness ratio of the negative plate (5) to the positive plate (1) is 1: 1.2.