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Method for evaluating consistency of batteries

A consistency and battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of not being able to truly and effectively judge the consistency of batteries, and achieve the effects of improving service life, low cost, and simple operation

Active Publication Date: 2009-08-26
上海诺昂汽车技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming that the battery consistency evaluation method in the prior art cannot really and effectively judge the battery consistency, and provide a method that can truly and effectively judge the battery consistency

Method used

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  • Method for evaluating consistency of batteries
  • Method for evaluating consistency of batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment is used to illustrate the battery consistency evaluation method provided by the present invention.

[0032] Put 10 fully-charged lithium-ion batteries (BYD company, LP053450 lithium-cobalt battery, working current of 1 ampere) respectively numbered a1, b1, c1, d1, e1, f1, g1, h1, i1, j1 The charging and discharging cabinet (Lanqi BK6016) is used for charging and discharging tests, and 10 batteries are subjected to constant current discharge. The constant current discharge current is 0.8 amps, the constant current discharge time is 35 minutes, and the shelf time is 12 minutes. At the same time, the voltage of the battery is detected to obtain the corresponding voltage-time curve. Measure the height of the instantaneous recovery segment AB and the slow recovery segment BC of the 10 battery voltage curves in the voltage direction and the length of the slow recovery segment BC in the time direction. Based on the height of the instantaneous recovery section ...

Embodiment 2

[0037] This embodiment is used to illustrate the battery consistency evaluation method provided by the present invention.

[0038] According to the method described in Example 1, 10 fully charged lithium-ion batteries respectively numbered a2, b2, c2, d2, e2, f2, g2, h2, i2, and j2 were evaluated for battery consistency. The constant current discharge current is 0.9 amps, the constant current discharge time is 50 minutes, and the rest time is 10 minutes. The results are shown in Table 2.

[0039] Table 2

[0040]

[0041] From the data in Table 2, it can be concluded that the comprehensive index value p of the consistency evaluation of the a2 battery and the f2, g2, and j2 batteries has the largest difference, and the q value is greater than 10%, and the consistency of the a2 battery and the f2, g2, and j2 batteries is determined Poor, can not be used in series or parallel to form a battery pack.

Embodiment 3

[0043] This embodiment is used to illustrate the battery consistency evaluation method provided by the present invention.

[0044] According to the method described in Example 1, 10 fully charged lithium ion batteries respectively numbered a3, b3, c3, d3, e3, f3, g3, h3, i3, and j3 were evaluated for battery consistency. The constant current discharge current is 1.2 amps, the constant current discharge time is 20 minutes, and the rest time is 11 minutes. The results are shown in Table 3.

[0045] table 3

[0046]

[0047] From the data in Table 3, it can be concluded that the comprehensive index value p of the consistency evaluation of the a3 battery and the h3, i3, and j3 batteries has the largest difference, and the q values ​​are all greater than 10%, which determines the consistency of the a3 battery and the h3, i3, and j3 batteries Poor, can not be used in series or parallel to form a battery pack.

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Abstract

The invention discloses a method for evaluating consistency of batteries, which is characterized by comprising the steps of acquiring voltage curves of a plurality of batteries, comparing heights in the voltage direction and distances in the time direction of slow recovering sections (BC)of the voltage curves of the plurality of batteries, and judging the consistency of the batteries according toa comparison result, wherein the voltage curves refer to curves of the changing of the voltage along with the time in the constant current charge or constant current discharge process and the following placing process of the plurality of batteries; and the slow recovering sections (BC) refer to sections having slow voltage increasing trend in the voltage curves. Essential distinctions of different batteries are more directly indentified through the voltage curves of the batteries so as to reduce damage to a battery pack due to inconsistency of the batteries and improve the service life of thebattery pack. In addition, the method for evaluating consistency of the batteries not only improves accuracy of evaluation, but also has low cost, simple and quick operation, and is suitable to be applied to industrial production.

Description

technical field [0001] The invention relates to a method for evaluating battery consistency. Background technique [0002] The battery pack is composed of multiple single cells connected in series and / or in parallel. However, due to the difference in consistency of each single cell, the performance of the battery pack will decline to varying degrees after a certain charge and discharge cycle, which is manifested as capacity. The increase of the attenuation rate and the difference in the consistency of the single cells in the battery pack become larger. The uneven performance of single batteries is not all due to the technical problems of battery production. There are many processes from the coating film to the finished product. Even if each process has undergone strict testing procedures, the voltage and internal The resistance and capacity are the same, and there will be differences after a period of use. If the consistency of the single cells that make up the battery pac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 李成亮刘琼吴光麟
Owner 上海诺昂汽车技术有限公司
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