Special lithium iron phosphate accumulator for new energy hybrid electric vehicle

Abstract

The invention discloses a special lithium iron phosphate accumulator for a new energy hybrid electric vehicle. The lithium iron phosphate accumulator comprises a plurality of single batteries which are combined in series-parallel connection, wherein each single battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate and the negative plate respectively comprise positive and negative current collectors and active substances; the positive and negative current collectors are same in size, and the active substances are coated on the positive and negative current collectors; the positive plate comprises lithium iron phosphate, a conductive agent and a positive current collector, wherein lithium iron phosphate has an olivine structure; an inclined aluminum mesh is adopted as the positive current collector, and the thickness of the aluminum mesh is 0.10-0.15 mm; the positive active substance of the each single battery comprises the following components in percentage by weight: LiFePO4:SP:KS-6:PVDF:NMP=(90-92):(1-2):(2-1):(5-6):(120-140). The special lithium iron phosphate accumulator disclosed by the invention has the advantages of high heat stability in a charging state, low oxidizing capacity on electrolyte and preferable overcharge resistant property through the structure and a preparation method by adopting lithium iron phosphate, has excellent temperature characteristics, can achieve the ambient operating temperature of -20-60 DEG C, and can be used for reducing the equipment purchase cost and the power consumption cost.

Description

technical field [0001] The invention relates to the field of electric storage manufacturing and preparation, and more specifically, relates to a dedicated lithium iron phosphate storage battery for powering hybrid electric vehicles. Background technique [0002] Today, with the increasing shortage of oil resources and increasingly serious environmental pollution, the harmonious development of energy, resources, environment and human society has increasingly become the focus of attention, seeking to develop alternative energy sources for traditional petrochemical energy, realizing the development of harmless resource industries, and seeking the harmony between people and the environment. It is particularly urgent to realize the clean energy supply of mainstream vehicles such as automobiles. At present, the widespread application of electric vehicles has become a reality, and the demand for high-energy density, large-capacity, and low-cost batteries is becoming stronger and st...

AI Technical Summary

Problems solved by technology

As mentioned above, lithium-ion batteries have the best application prospects among the various existing power supply series products, but the performance of lithium-ion batteries varies widely due to the different electrode material systems used.

Lithium cobalt oxide, a relatively mature positive electrode material, is only used as a positive electrode material for conventional small and medium-capacity batteries due to its poor safety. Basically, it does not have the possibility of making large-capacity and high-power power batteries.

The existing storage batteries have the following defects: short service life, high maintenance costs, and frequent replacement of batteries; existing commonly used batteries are polluted, highly corrosive to the environment, low in capacity density, and poor in energy storage; sensitive to overcharge

However, as a new energy hybrid vehicle, the lithium iron phosphate battery prepared under the above process conditions uses conventional positive electrode active materials such as lithium iron phosphate, graphite (super P), graphite (KS6), and has the charging characteristics of ordinary batteries. The defect that the stability is not high enough during the discharge process

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