Self-discharge screening method for lithium ion phosphate battery

A technology of lithium iron phosphate battery and screening method, which is applied in the field of lithium-ion batteries to achieve the effects of simple operation, improved consistency and high reliability
CN102117937BActive Publication Date: 2013-02-20HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI GUOXUAN HIGH TECH POWER ENERGY
Publication Date
2013-02-20

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Abstract

The invention discloses a self-discharge screening method for a lithium ion phosphate battery, belongs to the technical field of lithium ion batteries, and aims to provide a method for effectively screening the lithium ion phosphate battery with high self-discharge rate by using shelving in a charging state. According to the technical key points, the method comprises the following steps of: adding laminar lithium nickel cobalt manganese oxide or spinel lithium nickel manganese oxide which comprises 0.5 to 5 weight percent of lithium ion phosphate and has high voltage platform into a lithium ion phosphate-containing compound positive electrode; assembling the lithium ion phosphate battery by taking graphite as a negative electrode; fully charging the battery and then shelving the battery at an ambient temperature of between 20 and 45 DEG C; recording voltages before and after the shelf and shelf time; calculating the voltage difference before and after the shelf or a voltage variation value in unit time; and determining a critical value of the voltage difference of the batteries with the high self-discharge rate which are shelved in the same period or voltage variation in the unit time, and determining that the self-discharge rate of the battery of which the voltage difference or the voltage variation value in the unit time is greater than the critical value is high.
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Description

technical field

[0001] The invention relates to the field of lithium ion batteries, in particular to a self-discharge screening method for lithium iron phosphate batteries. Background technique

[0002] With the depletion of oil resources, it has become an inevitable trend to develop electric vehicles that use electricity as a power source to replace the current fuel vehicles, and the importance of power batteries, the core component of electric vehicles, is particularly prominent.

[0003] Due to its high energy density, low self-discharge, and long service life, lithium-ion power batteries have become the focus of research and development of power batteries for electric vehicles. At present, there are two main types of power batteries used in electric vehicles: one is lithium manganese oxide power battery, and the other is lithium iron phosphate power battery. Lithium iron phosphate batteries occupy the main market of electric vehicle power batteries due to their superio...

Claims

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