Sorting method of secondary batteries

A secondary battery and sorting technology, applied in sorting and other directions, can solve problems such as battery overcharge and speed up cell differences in the battery pack, and achieve the effect of extending service life, avoiding uncertain problems and reasonable sorting.

Active Publication Date: 2014-05-21
STATE GRID CORP OF CHINA +2
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Problems solved by technology

After the batteries are grouped, the "barrel effect" is mainly reflected in the charging end of the battery pack. Some battery cells first reach the charging cut-off voltage, while the voltage of other battery cells is lower. If this cycle continues, some cells will be overcharged for a long time. The phenomenon that the battery is full for a long time, which further accelerates the difference between the cells in the battery pack

Method used

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  • Sorting method of secondary batteries
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  • Sorting method of secondary batteries

Examples

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Embodiment 1

[0043] like Figure 1-6 As shown, the invention of this example is a sorting method for secondary batteries, and the method includes the following steps:

[0044] (1) Selection of the characteristic state of charge corresponding to the battery to be sorted;

[0045] Perform three complete charge-discharge cycles on the secondary battery cells to be sorted, select the charging curve of the step-up curve in the charging curve, and the charge-discharge rate is below 1 rate; the secondary battery cells to be sorted Including lithium iron phosphate battery and lithium titanate battery.

[0046]The last charging curve is regarded as the functional relationship V(t) of the independent variable time t and the dependent variable voltage V, and the curvature function K(t) of V(t) is solved through numerical analysis;

[0047] The numerical analysis includes the following processes: one is to perform nonlinear numerical fitting on the last charging curve to obtain a functional relation...

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Abstract

The invention relates to a sorting method of secondary batteries. The sorting method comprises the following steps: selecting featured charge states corresponding to to-be-sorted batteries, acquiring electrochemical alternating-current impedance spectroscopy of the to-be-sorted batteries, extracting two-dimensional feature parameters of the to-be-sorted batteries, and then determining battery monomers combined to form a battery pack. According to the internal features of the parts, from a charging platform to a charging cut-off voltage, of the secondary batteries, the consistency of the essentially sorted batteries is better than that of batteries sorted by a conventional method, the integral performance of the battery pack is improved, and the service life is prolonged.

Description

Technical field: [0001] The present invention relates to a battery sorting method, more specifically to a secondary battery sorting method. Background technique: [0002] Secondary batteries are used for energy storage technology, limited to the capacity, voltage, energy / power of battery cells and other reasons, and must be connected in series and parallel to form a group to meet the requirements of voltage level and energy / power level for energy storage applications. The number of batteries in a group is directly related to the specifications of the cells and the specific requirements of energy storage applications, and the overall performance of the batteries after grouping is not equal to the simple sum of the performance of the cells, due to the consistency difference between the cells. After the batteries are grouped, there is a "barrel effect". The application effect of battery energy storage is greatly reduced, which not only limits the performance of the battery, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344
Inventor 高飞杨凯李大贺刘皓胡晨王丽娜惠东来小康
Owner STATE GRID CORP OF CHINA
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