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Lithium ion battery grouping method

A lithium-ion battery, battery technology, applied in non-aqueous electrolyte battery, electrolyte battery manufacturing, secondary battery repair/maintenance, etc., can solve the problem of less than optimal battery efficiency

Active Publication Date: 2010-12-22
SHUANGDENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the battery pack assembled in this way, because the actual use environment is different from the standard conditions of the test parameters, the efficiency of the battery is not optimal when used, especially for high-power battery packs

Method used

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  • Lithium ion battery grouping method

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Experimental program
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Effect test

Embodiment 1

[0023] Matching method of the present invention, through the following steps to 002 # Box battery for matching:

[0024] 1. Select the battery cells with the same capacity range whose difference is less than 0.1Ah, in this case, 002 with 5.3Ah~5.4Ah # Box of 35 batteries.

[0025] 2. Leave the batteries after binning for at least 72 hours, 002 # The date of capacity division of the box battery is July 15, 2010, and the date of grouping is July 21, 2010. It has been put on hold for 6 days and meets the requirements.

[0026] 3. Connect the batteries with the same capacity in series according to the number required for each group, and connect 10 batteries in series with battery clips.

[0027] 4. Connect a voltmeter to each battery in parallel. For the convenience of recording, the battery cells are numbered from No. 1 to No. 10 from the total negative terminal of the battery pack. The recorded data is shown in Record Table 1. It can be seen from the table that the open circu...

Embodiment 2

[0035] Test and compare IMPDG211005001 and IMPDG211005002 to verify the superiority of the grouping method of the present invention. Battery pack capacity test:

[0036] Table 2 Capacity Test Record Form

[0037] Test parameters

[0038] It can be seen from the table that the batteries assembled by the method of the present invention have significantly higher capacity than batteries of the same specification by other assembly methods when discharging at high current.

[0039] Terminal voltage at the end of discharge of the battery pack:

[0040] Table 3 terminal voltage test record table

[0041] Test parameters

[0042] 1A charge 15A discharge

[0043] It can be seen from the table that the discharge cut-off voltage of the batteries assembled by the method of the present invention is lower than that of batteries with the same specifications of batteries assembled by other methods, indicating that the battery pack has a larger discharge depth an...

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Abstract

The invention discloses a lithium ion battery grouping method, which comprises the following steps: a) grading the batteries produced in the same batch by a lithium ion battery capacity division cabinet in accordance with the grade of 0.1 Ah; b) placing the graded batteries for a certain time; c) after placing the batteries, serially connecting the batteries with the capacity in the same grade according to the required number in each group; d) connecting a voltmeter to each battery in parallel, recording the open-circuit voltage of each battery and removing the battery the voltage deviation of which is more than 0.05 V, and replacing with other batteries with the same specification; e) configuring the resistive load according to the requirements of the discharge parameters of the group of batteries; f) connecting the batteries to the resistive load in series, quickly recording the voltage of a single battery and cutting off the load; and g) grading the batteries according to the voltage difference of a single battery before and after the load is connected in accordance with the grade of 0.05 V, and directly grouping the batteries in the same grade. The efficiency of the battery pack grouped by the method is maximized.

Description

technical field [0001] The invention relates to a lithium ion battery assembly method. Background technique [0002] High-power lithium-ion batteries need to connect several single batteries with low internal resistance in parallel to meet the capacity of high-current charging and discharging, and in order to meet the voltage requirements of the load, several high-power lithium-ion battery cells must be connected in series to form a group. The theory requires that the internal resistance, capacity and other parameters of these batteries should be the same, so that the power released by the battery can be maximized. Due to the influence of production conditions, manufacturing environment, material characteristics, and equipment, for the same batch of battery parameters such as cell rated capacity, cell open circuit voltage, cell charging voltage platform, cell discharge voltage platform, cell internal resistance, cell There are differences in geometric characteristics, etc. ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/42
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 季马贵袁春刚李恩国
Owner SHUANGDENG GRP
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