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Lithium ion battery for automotive startup power supply

A technology for starting lithium-ion batteries and automobiles, which is applied in the direction of battery electrodes, secondary batteries, battery pack components, etc. It can solve the problem that automobiles cannot be started at low temperature, and the high-temperature cycle performance of lithium-ion batteries is not enough to meet the requirements of the automobile starting power supply environment. needs, environmental pollution and other issues, to achieve the effect of ensuring cycle life and safety performance

Inactive Publication Date: 2015-02-18
保山市艾特佳新能源科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a new energy source with high specific energy, long cycle life and low environmental pollution, lithium-ion batteries have gradually replaced lead-acid batteries in some application fields, but the low-temperature discharge performance of lithium-ion batteries, especially the high-rate discharge performance at low temperatures, is inferior Poor, it can not meet the needs of starting the car at low temperature, and the high-temperature cycle performance of the lithium-ion battery is not enough to meet the needs of the environment in which the car starts the power supply

Method used

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  • Lithium ion battery for automotive startup power supply
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  • Lithium ion battery for automotive startup power supply

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Embodiment Construction

[0025] In order to further illustrate the technical means adopted by the present invention and its effects, the following describes in detail in conjunction with preferred embodiments of the present invention and accompanying drawings.

[0026] The invention provides a lithium ion battery for starting a power supply of an automobile, comprising a positive electrode material, a negative electrode material, a separator and an electrolyte;

[0027] Described anode material comprises by accounting for total weight percentage:

[0028] 45% to 53% of lithium iron phosphate, 1% to 2% of conductive graphite, 1% to 2% of conductive carbon nanotubes, 3% to 4% of polyvinylidene fluoride (PVDF), and N-methylpyrrolidone (NMP ) to complete.

[0029] The starting power supply for automobiles first requires high safety performance and good high-temperature cycle performance. With its stable olivine structure, lithium iron phosphate material has high safety and stability, which is beneficial...

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Abstract

The invention provides a lithium ion battery for an automotive startup power supply. The lithium ion battery contains a cathode material, an anode material, a diaphragm and an electrolyte. The cathode material contains, by weight, 45-53% of lithium iron phosphate, 1-2% of conductive graphite, 1-2% of conductive carbon nanotube, 3-4% of polyvinylidene fluoride and the balance N-methylpyrrolidone. Material system optimization includes cathode material optimization by using a nanoscale lithium iron phosphate material, anode material optimization by using the anode material with large interplanar spacing, and selection of a diaphragm material with high porosity and an optimized electrolyte. Thus, discharge termination voltage of the lithium ion battery for the automotive startup power supply is greater than 2.2V at minus 18 DEGC / 30C, 1C / 30C discharge circulation reaches 2000 times at 60 DEG C, and capacity retention rate is greater than 90%. Rate capability of the battery is good, and low-temperature low-rate discharge termination voltage is high. Thus, the battery can meet requirements of the automotive low-temperature startup power supply, and cycle life and safety performance of the battery can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery production, and in particular relates to a lithium-ion battery for an automobile starting power supply. Background technique [0002] Lead-acid batteries have always dominated the automotive starter power market. As environmental problems become more and more prominent, lead-acid batteries will gradually be replaced by new clean energy sources. As a new energy source with high specific energy, long cycle life and low environmental pollution, lithium-ion batteries have gradually replaced lead-acid batteries in some application fields, but the low-temperature discharge performance of lithium-ion batteries, especially the high-rate discharge performance at low temperatures, is inferior Poor, it can't meet the needs of starting the car at low temperature, and the high-temperature cycle performance of the lithium-ion battery is not enough to meet the needs of the environment where the car's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/58
CPCB82Y30/00H01M4/5825H01M4/587H01M10/0525H01M10/0567H01M50/411Y02E60/10
Inventor 王瑞娟黄文达
Owner 保山市艾特佳新能源科技有限公司
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