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High-power lithium ion battery for automobile start-stop power supply

A lithium-ion battery, high-power technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the inability of vehicles to recover braking energy, the inability of batteries to be charged with high power, and the reduction of fuel-saving effects, so as to improve battery performance. Current capacity, structural stability, and the effect of improving electrical conductivity

Inactive Publication Date: 2021-03-30
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing lithium-ion battery for starting and stopping has large internal resistance, low power, and low available energy. Especially at low temperatures, the battery cannot be charged with high power, which leads to the failure of the car to recover braking energy at low temperatures and reduces the fuel-saving effect.
In addition, the existing lithium-ion battery for start and stop has a short working life and rapid performance degradation at high temperatures

Method used

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  • High-power lithium ion battery for automobile start-stop power supply
  • High-power lithium ion battery for automobile start-stop power supply
  • High-power lithium ion battery for automobile start-stop power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A kind of high-power lithium-ion battery of the automobile start-stop power supply of the present embodiment, as Figure 4 Shown: including positive electrode sheet, negative electrode sheet, positive electrode ear 3, negative electrode ear 1, separator, electrolyte and battery case. The positive electrode sheet includes a positive electrode current collector, a conductive coating coated on the positive electrode current collector, and a positive active material layer coated on the surface of the positive electrode current collector conductive coating: the negative electrode sheet includes a negative electrode current collector and is coated on the negative electrode. The negative electrode active material layer on the surface of the current collector, the positive electrode sheet and the negative electrode sheet form the battery 2, and the battery 2 is placed in the battery casing, and the positive electrode ear 3 and the negative electrode ear 1 protrude from both ends...

Embodiment 2

[0075] The present invention includes positive electrode sheet, negative electrode sheet, positive electrode ear 3, negative electrode ear 1, separator, electrolyte and battery case. The positive electrode sheet includes a positive electrode current collector, a conductive coating coated on the positive electrode current collector, and a positive electrode active material layer coated on the surface of the positive electrode current collector. In terms of mass percentage, the content of the positive electrode active material layer is as follows:

[0076] Lithium iron phosphate 88%;

[0077] Carbon black 5.8%;

[0078] Carbon nanotubes 1.5%;

[0079] Graphene 1.7%;

[0080] Polyvinylidene chloride 3%;

[0081] The particle size D50 of lithium iron phosphate ranges from 0.2 μm to 0.5 μm, and the maximum particle size does not exceed 5 μm; the mass percentage of the carbon coating layer on the surface of lithium iron phosphate particles is 1.5% to 2.5%. The lithium iron phosp...

Embodiment 3

[0095] The product structure of this embodiment is the same as that of Embodiment 1. The difference from Example 1 is that the positive current collector is a conductive coated aluminum foil with a total thickness of 21 μm, wherein the conductive coating is coated on the positive current collector before coating the positive active material, and the conductive coating with a total thickness of 1 μm is conductive. The coating is a mixture of carbon black, carbon nanotubes, graphene and a binder. The mass ratio of carbon black, carbon nanotubes, graphene and binder is: 7.5:0.8:1.5:0.2. All the other preparation methods are the same as in Example 1.

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Abstract

A high-power lithium ion battery for an automobile start-stop power supply comprises a positive plate and a negative plate, the tab width accounts for more than 50% of the width of the battery; the positive electrode current collector is a conductive coating aluminum foil with the total thickness of 24 microns, the conductive coating is coated on the positive electrode current collector before thepositive electrode active substance is coated, and the total thickness of the conductive coating is 0.5-2 microns; the positive electrode active substance is lithium iron phosphate; the positive electrode conductive agent is a mixture of carbon nanotubes, graphene and carbon black; and the electrolyte contains a lithium salt, an organic solvent and an additive. According to the invention, the overcurrent capacity of the battery can be improved, the power performance is enhanced, the problem of low conductivity of the lithium iron phosphate anode is solved, and the electrode conductivity is improved; particularly, the low-temperature rate discharge capacity is improved by more than 30%; the falling of lithium iron phosphate from the aluminum foil can be slowed down, and the cycle life is prolonged by about 8%; the electrolyte is not easy to vaporize at a high temperature, still has low viscosity at a low temperature of -30 DEG C, and maintains high ionic fluidity.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries. In particular, the invention relates to a high-power lithium-ion battery used for a start-stop power supply of an automobile. Background technique [0002] The "Energy Conservation and New Energy Automobile Industry Development Plan" issued by the State Council in 2012 proposed that the average fuel consumption of passenger vehicles should drop to 6.9 liters / 100 kilometers by 2015 and 5 liters / 100 kilometers by 2020. The fuel consumption target of 5 liters per 100 kilometers in 2020 can only be achieved by applying 48V start-stop battery hybrid technology. At present, if the 48V start-stop battery hybrid technology is adopted in large quantities, it can achieve the effect of saving fuel by 10% to 20%, thereby reducing carbon emissions and achieving the effect of energy saving and emission reduction. [0003] The existing lithium-ion battery for starting and stopping has large inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/58H01M4/62H01M10/0567H01M10/0568
CPCH01M4/5825H01M4/362H01M4/625H01M4/366H01M10/0567H01M10/0568H01M10/0525H01M2004/028Y02E60/10
Inventor 方坤娄勇刚张宝华孙龙
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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