Screening grouping method of echelon utilization type lithium batteries

A lithium battery and battery technology, applied in the direction of sorting, etc., can solve the problem of the method of screening and grouping of batteries without steps, and achieve the effects of ensuring capacity utilization, improving consistency, and prolonging service life

Active Publication Date: 2014-05-14
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0003] At present, there is no relevant research on the method o

Method used

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  • Screening grouping method of echelon utilization type lithium batteries
  • Screening grouping method of echelon utilization type lithium batteries
  • Screening grouping method of echelon utilization type lithium batteries

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0030] This embodiment provides a method for screening and grouping lithium batteries in stages. The batteries are lithium manganese oxide power batteries and lithium iron phosphate batteries used in electric vehicles. Take the eliminated lithium manganate power battery for a bus for the 2008 Olympic Games as an example. Let me explain.

[0031] The step-by-step lithium battery screening method includes the following four steps:

[0032] (1) dQ / dV-V curve

[0033] The dQ / dV-V curve test method of the retired power battery adopts the "Test Specifications for Lithium-ion Batteries for Electric Vehicles" (QC / T743-2006 standard), and the test is performed continuously for 3 times, and the third Q-V test data is extracted and differentiated to obtain the battery The dQ / dV-V curve, through analysis, eliminates the battery that the loss of the negative electrode a...

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Abstract

The invention relates to a screening grouping method of echelon utilization type lithium batteries, and belongs to the technical field of determination of parameters of the lithium batteries. According to the technical scheme, the screening grouping method of the echelon utilization type lithium batteries comprises the following steps: testing and calculating so as to obtain a battery dQ/dV-V curve, analyzing ageing reasons of return power batteries by adopting an ICA (Incremental Capacity Analysis) method, and firstly rejecting the return power batteries, negative active materials of which are lost; testing to obtain the capacities, ohmic internal resistance, polarization internal resistancs and self-discharge values of the echelon utilization type lithium batteries, and screening the batteries according to indexes; and regrouping the screened batteries. The screening grouping method of the echelon utilization type lithium batteries has the beneficial effects that serious declining batteries are rejected by screening the echelon utilization type lithium batteries so as to ensure that the echelon utilization grouping property of the batteries is not affected by individual damaged battery; the batteries which are similar in terms of capacity, ohmic internal resistance and polarization internal resistance are clustered together by using a weighting k-means clustering method, and due to the setting of weights, the capacity utilization rate of a battery group is ensured; the forming consistency of the echelon utilization type lithium batteries can be improved, and the service life of the echelon utilization type lithium batteries is prolonged.

Description

technical field [0001] The invention relates to a screening and grouping method using lithium batteries in steps, and belongs to the technical field of lithium battery parameter determination. Background technique [0002] With the gradual industrialization of electric vehicles, the output of lithium batteries for electric vehicles will increase significantly, and the ensuing question is how to recycle and dispose of the eliminated lithium batteries. According to the national standard for the use of electric vehicle batteries, when the capacity of lithium-ion batteries declines to 80% of the original capacity, it is no longer suitable to continue to be used in electric vehicles, which increases the cost of the vehicle; lithium batteries for electric vehicles contain lithium metal materials and electrolytic If the waste lithium battery cannot be effectively recycled, it will not only cause a waste of resources, but also cause serious pollution to the environment. Therefore,...

Claims

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Application Information

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IPC IPC(8): B07C5/344
Inventor 张鸿张彩萍张维戈王玉坤安动马伟强杨万宏张西术袁继军梁东穆勇
Owner STATE GRID CORP OF CHINA
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