Lithium iron phosphate plastic housing cylindrical battery and preparation method thereof

A technology of plastic shell and lithium iron phosphate, which is used in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problems of difficult assembly of metal shell cylindrical batteries, unsatisfactory ion diffusion, and low yield. Achieve excellent safety performance, low cost, and improve the effect of short circuit resistance

Active Publication Date: 2013-03-06
SHANDONG TIANYANG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] A cylindrical battery with a plastic shell disclosed by the invention solves the problems of difficult assembly and low yield of large-capacity metal shell cylindrical batteries
What is improved is the problem of poor insulation effect of the conventional separator, easy short circuit, unsatisfactory ion diffusion and poor strength, and improves the safety performance of the battery such as short circuit resistance, acupuncture resistance, impact resistance, and extrusion resistance.

Method used

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  • Lithium iron phosphate plastic housing cylindrical battery and preparation method thereof
  • Lithium iron phosphate plastic housing cylindrical battery and preparation method thereof
  • Lithium iron phosphate plastic housing cylindrical battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A cylindrical battery with a lithium iron phosphate plastic case, including a case, a winding core and an electrolyte. The winding core is a cylindrical winding core formed by adding positive and negative electrode sheets to the diaphragm; the positive electrode sheet is made by coating the positive electrode slurry with lithium iron phosphate as the main component on the aluminum foil, and the negative electrode sheet is made by coating the negative electrode slurry It is made of copper foil; the shell is mainly composed of a plastic shell, b end cover, c upper pole, d lower pole, e inner gasket, f outer gasket and g fixing nut, such as figure 1 shown. a The plastic shell is open at one end, and the other end is semi-sealed, leaving a round hole in the center, such as figure 2 As shown; the b end cover is a cylinder made of PP material that matches the open end of the plastic shell, with a round hole in the middle and a liquid injection hole at a position off the cen...

Embodiment 2

[0054] Keep the other schemes of Example 1 unchanged, only change the formula of the positive and negative electrode slurry: the positive electrode slurry is 7 parts by weight of polyvinylidene fluoride, 87 parts of lithium iron phosphate, 3 parts of Conductive carbon black, 3 parts of conductive graphite and N-methyl-2-pyrrolidone are reconciled into a slurry with a solid content of 35%; the negative electrode slurry is 89 parts by weight of graphite, 2 parts of conductive carbon black , 2 parts of conductive graphite, 2 parts of sodium carboxymethyl cellulose, 2.5 parts of styrene-butadiene rubber and 2.5 parts of water-based glue were mixed with deionized water to form a slurry with a solid content of 45%.

[0055] Several typical examples of preparation of the special diaphragm used in the winding core of the present invention are provided below.

Embodiment 3

[0057] Dissolve 3000g polyvinylidene fluoride, 6000g vinylidene fluoride-hexafluoropropylene copolymer, 800g polyacrylonitrile, 5000g polymethyl methacrylate into 50000g acetone, 2000g ethyl acetate, 1000g ethanol solvent, the dissolution temperature is 40-80 ℃, and then add 2500g of aluminum oxide and 2500g of silicon dioxide for stirring and dispersing to obtain a viscous slurry. Coat the viscous slurry prepared on the polypropylene microporous film with the coating equipment, and dry the diaphragm coated with the slurry in the oven of the coating equipment, and the dried diaphragm is vacuum-baked at 80°C , remove the residual solvent, and then obtain the diaphragm used in the winding core in the foregoing embodiment. According to the requirements of lithium-ion power battery manufacturers, the diaphragm can be made into diaphragms of different widths after cutting.

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Abstract

The present invention relates to a lithium iron phosphate plastic housing cylindrical battery and a preparation method thereof, wherein the battery is applicable for lithium ion batteries having a medium-large capacity. According to the method, a lithium iron phosphate material, an electric conduction agent, a binder and the like are mixed to obtain a positive electrode slurry; graphite, an electric conduction agent, a binder and the like are mixed to obtain a negative electrode slurry; the positive electrode slurry is coated on an aluminum foil to prepare a positive electrode sheet; the negative electrode slurry is coated on a copper foil to prepare a negative electrode sheet; the positive electrode sheet and the negative electrode sheet are added to a specially designed diaphragm to carry out rolling to obtain a cylindrical rolling core; the rolling core, a plastic housing, end caps, an upper post terminal, a lower post terminal, an inner gasket, an outer gasket and a fixation nut are assembled; and finally liquid injection formation is performed to prepare the finished battery. The present invention relates to a lithium iron phosphate plastic housing cylindrical battery and a preparation method thereof, the method has advantages of convenient assembly, high production efficiency and low cost, and battery safety performances such as short circuit resistance, needling resistance, impact resistance, extrusion resistance and the like can be improved by using the specially designed diaphragm.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a cylindrical battery with a lithium iron phosphate plastic shell of medium and large capacity and a preparation method thereof. technical background [0002] Lithium-ion batteries are increasingly used in the power field and energy storage field. In the field of power, when lithium-ion batteries are applied to electric cars and electric buses, a large battery capacity is required to meet the cruising range; in the field of energy storage, high-power energy storage power stations also put forward high requirements for the capacity of lithium-ion batteries . Therefore, lithium-ion batteries in these fields need larger and larger monomer capacities to meet the requirements. [0003] There are two main types of existing lithium-ion batteries, one is a cylindrical battery and the other is a square battery. [0004] At present, the shells of cylindrical batteries are mostly made ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/12H01M2/16H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 徐建贞朱玉法柳艾美孟庆帅
Owner SHANDONG TIANYANG NEW ENERGY
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