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Hydrogen storage alloy powder of nickel-metal hydride battery for ultralow-temperature environment and preparation method thereof

A technology of nickel-metal hydride batteries and hydrogen storage alloys, applied in the direction of nickel storage batteries, battery electrodes, alkaline storage batteries, etc., can solve the problem of low discharge efficiency, insufficient low-temperature performance of nickel-hydrogen batteries, and inability to meet the low-temperature performance of nickel-hydrogen batteries, etc. Problems, to meet the requirements of use, improve the effect of discharge efficiency

Inactive Publication Date: 2020-05-19
深圳拓量技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the performance of Ni-MH batteries at low temperature has not been superior enough
Conventional Ni-MH batteries are generally used at temperatures between -20°C and +40°C. When the temperature is lower than -20°C, the discharge efficiency of Ni-MH batteries gradually decreases. When the temperature is only -40°C, the discharge efficiency of Ni-MH batteries is low. less than 50%, which cannot meet the low-temperature performance requirements of nickel-metal hydride batteries for existing electric vehicles

Method used

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  • Hydrogen storage alloy powder of nickel-metal hydride battery for ultralow-temperature environment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This implementation provides a method for preparing hydrogen storage alloy powder of a nickel-hydrogen battery for ultra-low temperature environment, which includes the following steps:

[0024] Step 1: The components in the first hydrogen storage alloy powder and the second hydrogen storage alloy powder are blended according to mass percentages and melted to obtain hydrogen storage alloy flakes; the thickness of the hydrogen storage alloy flakes is 80um-150um.

[0025] Step two: heat the hydrogen storage alloy sheet; the heat treatment temperature is 860-1010°C, and the heat treatment time is 3-5 hours.

[0026] Step three: mechanically pulverize the hydrogen storage alloy sheet into hydrogen storage alloy powder to obtain hydrogen storage alloy powder for a nickel-hydrogen battery for ultra-low temperature environment.

[0027] Among them, the first hydrogen storage alloy powder includes 22% La, 10% Ce, and 2% Nd in the total mass percentage of the hydrogen storage alloy powde...

Embodiment 2

[0031] The difference from Example 1 is the composition and ratio of the hydrogen storage alloy powder: the first hydrogen storage alloy powder includes 22% La, 10% Ce, 2% Nd, and 0.5 in the total mass percentage of the hydrogen storage alloy powder. % Of Pr and 0.5% of Zr, Y and Mg of 1:1:1 by mass. The second hydrogen storage alloy powder includes 57% of Ni, 5% of Co, and 1% of total hydrogen storage alloy powder. Al, 1.5% Mn and 0.5% Cu and Si with a mass percentage of 1:1.

[0032] The rest is the same as Embodiment 1, and will not be repeated here.

[0033] Record the battery number as No. 2.

Embodiment 3

[0035] The difference from Example 1 is the composition and ratio of the hydrogen storage alloy powder: the first hydrogen storage alloy powder includes 22.4% La, 10% Ce, 2% Nd, and 0.3 in the total mass percentage of the hydrogen storage alloy powder. % Of Pr and 0.3% of Zr, Y and Mg of 1:1:1 by mass. The second hydrogen storage alloy powder includes 57% of Ni, 5% of Co, and 1% of total hydrogen storage alloy powder. Al and 2% Mn.

[0036] The rest is the same as Embodiment 1, and will not be repeated here.

[0037] Record the battery number as No. 3.

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Abstract

The invention belongs to the technical field of nickel-metal hydride batteries, in particular to hydrogen storage alloy powder of a nickel-metal hydride battery for an ultralow-temperature environment. The hydrogen storage alloy powder comprises first hydrogen storage alloy powder and second hydrogen storage alloy powder. The first hydrogen storage alloy powder comprises, by mass percent, 19%-24%of La, 9%-12% of Ce and 0.5%-2% of Nd in the total mass percent of the hydrogen storage alloy powder; and the second hydrogen storage alloy powder comprises the following components in percentage by mass: 57-63% of Ni, 5-7.5% of Co, 0.8-2.2% of Al and 0.5-2% of Mn in the total mass percentage of the hydrogen storage alloy powder. The hydrogen storage alloy powder is prepared by the preparation method disclosed by the invention, and the nickel-metal hydride battery prepared from the hydrogen storage alloy powder can be charged and discharged in an ultra-low temperature environment of-40 DEG C,the 0.1 C discharge efficiency is greater than or equal to 95%, the 0.2 C discharge efficiency is greater than or equal to 70%, the discharge efficiency is improved, and the use requirements of the nickel-metal hydride battery in the ultra-low temperature environment are met.

Description

Technical field [0001] The invention belongs to the technical field of nickel-hydrogen batteries, and particularly relates to a hydrogen storage alloy powder of a nickel-hydrogen battery used in an ultra-low temperature environment and a preparation method thereof. Background technique [0002] With the rapid development of the field of new energy vehicles, a series of advanced battery technologies have been or are expected to be applied in this field in the future, including lithium ion batteries, nickel hydride batteries, super capacitors, etc. Among them, lithium-ion batteries have the advantages of high energy density, high power density, and low self-discharge, making them the most widely used energy storage device in the field of pure electric vehicles. However, disadvantages such as poor safety performance, low temperature performance and high battery cost hinder its large-scale application in the field of electric vehicles. [0003] As a mature secondary battery technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/30B22F1/00B22F9/04C22C19/03C22C30/00
CPCB22F1/0003H01M4/383H01M10/30B22F9/04C22C19/03C22C30/00Y02E60/10
Inventor 唐颖斐
Owner 深圳拓量技术有限公司