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A sorting method for secondary batteries

A secondary battery and battery technology, applied in sorting and other directions, can solve the problems of high cost, complex battery sorting process, long sorting cycle, etc., to improve production efficiency, simplify sorting process and sorting equipment, reduce The effect of production costs

Active Publication Date: 2016-02-17
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sorting method for secondary batteries, which aims to solve the problems of complicated sorting process, long sorting period and high cost of existing batteries

Method used

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  • A sorting method for secondary batteries
  • A sorting method for secondary batteries
  • A sorting method for secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Select 10 fully charged 32650-3.2V-5Ah-LR lithium iron phosphate power batteries from the same batch, place them in the lithium-ion battery detection cabinet, set the 5C rate current to discharge to 2.0V, and use the computer Record data;

[0033] (2) Make sure the capacity range of the selected secondary battery is 5000-5400mAh, set the lower limit discharge time to 12 minutes, select the battery that is greater than the lower limit discharge time, and divide it by 30 seconds;

[0034] (3) For secondary batteries within the selected capacity range, set the lower limit of 2.80V discharge platform time to 10 minutes, and select batteries greater than the lower limit of 2.80V discharge platform time;

[0035] (4) Sorting the batteries obtained in step (3) by internal resistance. In this embodiment, the internal resistance is required to be less than 10Ω. After the discharge is over, a current signal is given to the battery, and the internal resistance of the secondar...

Embodiment 2

[0045] In this embodiment, in step (3), the lower median voltage of the secondary battery within the selected capacity range can also be set to 2.93V, and the battery with a lower median voltage greater than 2.93V is regarded as a qualified battery. Specifically:

[0046] Take 10 32650-5Ah-LR secondary batteries to be tested and place them in the battery charge and discharge detection device. The computer controls the discharge test, collects and records the 5C discharge time of each battery, the median voltage and the internal resistance of the battery, and at the same time For data comparison, if the battery labels are: 1, 2, 3..., 10, the data records are shown in Table 2 below:

[0047] battery serial number

5C discharge time / min

Median voltage / V

Internal resistance / mΩ

1

11.4

2.9352

8.8

2

12.12

2.9458

8.7

3

12.38

2.9399

9.2

4

12.09

2.9244

9.1

5

12.21

2.9458

8...

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Abstract

The invention relates to a method for separating secondary batteries. The method comprises the following steps: (1) selecting a batch of secondary batteries in a full energy state, placing the batch of secondary batteries in a charge-discharge detection device for a lithium ion battery, discharging the secondary batteries in a 3C-10C rate, and recording discharge data by using a computer; (2) setting the low limit of discharge time according to the capacity range of the selected secondary batteries, and classifying the batteries with the discharge time longer than the low limit of discharge time according to a setting range; (3) setting a low limit discharge platform or a low limit mid-value voltage for the selected secondary batteries in the capacity range according to needs to obtain the batteries more than the low limit discharge platform or the low limit mid-value voltage; and (4) carrying out internal resistance separation on the batteries obtained in step (3), and selecting the batteries with satisfactory internal resistances. After the technical scheme is adopted, a separation process is simplified, separation equipment is reduced, the separation speed is increased and the separation quality is improved, the production cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of battery manufacturing, in particular to a sorting method for secondary batteries. Background technique [0002] With the increasing shortage of oil resources and the increasingly serious air pollution, lithium-ion power batteries have the advantages of high specific energy, high specific power, no memory effect, high working voltage, low self-discharge, friendly manufacturing environment, no pollution, and long cycle life. , has been paid more and more attention by people, and is widely used in mobile communication equipment, small power plants, hybrid electric vehicles, pure electric buses and other fields. The lithium-ion power battery pack is composed of multiple single lithium-ion batteries through appropriate series and parallel connections. If the technical parameters (such as voltage, capacity, internal resistance, etc.) of each single battery do not match and the difference is too large, It may cause uneve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344
Inventor 李瑶
Owner OPTIMUM BATTERY CO LTD
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