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Method for charging battery pack

A charging method and technology of battery packs, which are applied in secondary battery charging/discharging, secondary battery repair/maintenance, etc., and can solve problems such as thermal runaway, uneven current intensity, and fire

Active Publication Date: 2013-12-04
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bias current (especially when the bias current rate is large) will lead to uneven current intensity flowing through the battery cells and uneven heating of the battery, which will lead to local "hot spots" inside the battery pack, and even thermal runaway and fire accidents

Method used

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  • Method for charging battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] For a battery pack connected in parallel, it is composed of ten 18650 lithium titanate batteries. The positive electrode of the lithium titanate battery is lithium cobalt oxide material, and the negative electrode is lithium titanate material. The rated capacity is 1Ah, the rated internal resistance is 5mΩ, and the rated The voltage is 2.4V.

[0040] For the 1C charging of the parallel battery pack, the traditional method (that is, directly charging with 1C) and according to The method increases the charging current of each battery cell to 1C (1 ampere) and then performs constant current charging. The two methods were carried out for 1000 charge and discharge cycles, and the comparison results are shown in Table 1:

[0041] Wherein: the maximum bias current rate between battery cells refers to (same as in other embodiments):

[0042] In the 1000 times of charging process, one charging process is randomly selected in every 100 times, for example: in the 1-100 charging...

Embodiment 2

[0050] For a battery pack connected in parallel, it is composed of ten 26650 lithium titanate batteries. The positive electrode of the lithium titanate battery is lithium cobalt oxide material, the negative electrode is lithium titanate material, the rated capacity is 2.5Ah, and the rated internal resistance is 6mΩ. Nominal voltage is 2.4V.

[0051] For the 2C charging of the parallel battery pack, adopt the traditional method (that is, charge directly at 2C) and according to The way to increase the charging current to 2C (5 amps) and then carry out constant current charging. The two methods were carried out for 1000 charge and discharge cycles, and the comparison results are shown in Table 2:

[0052] In this embodiment, B=0.1, S=20, R=2, A=6, V=2

[0053] attached figure 2The current intensity-time curve in the variable current charging stage of this embodiment is given, and it can be seen that the variable current charging stage lasts about 50 seconds.

[0054] Table ...

Embodiment 3

[0057] For a parallel battery pack, it consists of 20 18650-type lithium iron phosphate batteries. The positive electrode of the iron phosphate battery is lithium iron phosphate material, and the negative electrode is graphite material. The rated capacity is 1Ah, the rated internal resistance is 3mΩ, and the rated voltage is 3.4 V.

[0058] For the 3C charging of the parallel battery pack, adopt the traditional method (that is, directly charge with 3C) and according to The way to increase the charging current to 3C (3 amps) and then carry out constant current charging. The two methods were carried out for 1000 charge and discharge cycles, and the comparison results are shown in Table 3:

[0059] In this embodiment, B=0.5, S=5, R=2, A=3, V=2

[0060] attached image 3 The current intensity-time curve in the variable current charging stage of this embodiment is given, and it can be seen that the variable current charging stage lasts about 550 seconds.

[0061] table 3

[0...

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Abstract

The invention relates to a method for charging a battery pack. The method comprises three charging steps, in step 1 the charging current is increased from zero to a set value Im according to a specific mathematical function, and step 2 and step 3 are respectively conventional constant current charging and constant voltage charging. The charging method of the invention helps to reduce the bias current phenomenon of the battery pack during charging and prolong service life of the battery pack.

Description

[technical field] [0001] The invention relates to a charging method for battery packs, in particular to a charging method for parallel battery packs. [Background technique] [0002] With the decrease of petroleum resources and the seriousness of environmental pollution, environmental protection, energy saving and emission reduction have become the trend and trend of the world. In this context, in recent years, electric vehicles (mainly including hybrid electric vehicles, plug-in hybrid electric vehicles, and pure electric vehicles) with batteries as the main power source or part of the power source have gradually appeared and increased. The carbon emissions of electric vehicles The carbon emissions of pure electric vehicles are even zero, and they have the characteristics of high energy conversion efficiency, which makes people regard electric vehicles as an important choice to replace internal combustion locomotives in the future. [0003] At present, the power source of e...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCY02E60/12Y02E60/10
Inventor 李辉仝志明
Owner MICROVAST POWER SYST CO LTD
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