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Battery core capacity grading method of lithium ion battery

A lithium-ion battery and battery cell technology, which is applied in secondary battery charging/discharging, secondary battery, secondary battery testing, etc., can solve the problems of long time in the capacity separation process, affecting production efficiency, wasting electric energy, etc., and achieve shortening The effect of capacity-dividing process time, saving capacity-dividing power, and improving production capacity

Active Publication Date: 2018-08-21
SUZHOU YOULION BATTERY INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this current capacity separation technology is that it takes a long time for the capacity separation process, which affects production efficiency, and the power consumption in the capacity separation process is relatively high, which is a waste of electric energy.

Method used

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  • Battery core capacity grading method of lithium ion battery
  • Battery core capacity grading method of lithium ion battery
  • Battery core capacity grading method of lithium ion battery

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Embodiment Construction

[0018] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0019] see figure 1 , the figure shows a lithium-ion battery cell capacity separation method provided by an embodiment of the present invention, which includes the following steps:

[0020] 1) Fully charge the cell;

[0021] 2) On the open circuit voltage curve corresponding to the SOC of the battery cell, find the position A with the largest slope slope near SOC 30%, and meet the shipping requirements, so this position A is selec...

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Abstract

The invention provides a battery core capacity grading method of lithium ion battery. The battery core capacity grading method of lithium ion battery comprises following steps: 1, a battery core is full charged; 2, a point with the largest curve slope on an open-circuit voltage curve corresponding to SOC of the battery core is determined; 3, discharge current and discharge time are obtained baseddetermination of the point with the largest curve slope; 4, the battery core is subjected to discharging based on the discharge current and the discharge time; and 5, the voltage of the battery core is measured. Compared with the prior art, the attery core capacity grading method possesses following advantages: capacity grading discharge process is shortened, the capacity grading method is simple,about 40% capacity grading electric energy can be saved, capacity grading process time is shortened greatly, and production power is increased effectively.

Description

technical field [0001] The invention relates to a method for separating the capacity of batteries, in particular to a method for dividing the capacity of lithium-ion batteries. Background technique [0002] In the current production process of lithium-ion batteries, it is usually necessary to divide the capacity of the battery cell. The capacity division of the battery cell is actually a process of screening the actual capacity of the battery. Unlike charging, the battery can only be measured in the process of discharging. actual capacity. For example, the discharge time of 1C5 (5 is the subscript) A discharge performance required in the GB / T18287-2000 standard is not less than 51 minutes, while the industry usually takes 60 minutes as the minimum requirement. [0003] The capacity division of batteries is usually achieved through capacity division cabinets, which can effectively distinguish the quality of lithium-ion batteries. In the current capacity division technology,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4285H01M10/446H01M10/448Y02E60/10
Inventor 韩承宋尚随军郑荣鹏
Owner SUZHOU YOULION BATTERY INC
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