Lithium ion power battery cell matching method

A power battery, lithium-ion technology, applied in the field of lithium-ion power batteries, can solve the problems of insufficient vehicle cruising range, reduced single cell capacity, increased single cell production cost, etc., so as to improve the overall capacity and reduce internal consumption. , the effect of simple and easy operation

Active Publication Date: 2021-06-22
WUHU ETC BATTERY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the capacity of lithium-ion batteries after grouping is lower than that of single batteries, which directly leads to insufficient cruising range of vehicles, and also increases the production cost of single batteries.

Method used

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  • Lithium ion power battery cell matching method
  • Lithium ion power battery cell matching method
  • Lithium ion power battery cell matching method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058] Example 1 [lithium iron phosphate - energy storage hard shell]

[0059] A method for assembling 100Ah lithium iron phosphate energy storage hard shell batteries, comprising the following steps:

[0060] (1) Do a special charge and discharge process for all the cells to be assembled, specifically follow the steps below:

[0061] (1-1) Stand still for 5 minutes;

[0062] (1-2) 50A constant current charging to 3.55V;

[0063] (1-3) Stand still for 5 minutes; and test the voltage V of the cell at this time 1 , V 1 All in the range of 3.35 ~ 3.38V;

[0064] (1-4) 10A constant current charging to 3.65V;

[0065](1-5) 3.65V constant voltage charging to 5A;

[0066] (1-6) Stand still for 5 minutes;

[0067] (1-7) 50A constant current discharge to 2.7V;

[0068] (1-8) Stand still for 5 minutes; and test the voltage V of the cell at this time 2 , V 2 Both are in the range of 2.60~2.90V;

[0069] (1-9) 10A constant current discharge to 2.5V;

[0070] (1-10) stand still...

example 2

[0076] Example 2 [nickel cobalt lithium manganese oxide - power soft package]

[0077] A 40Ah nickel-cobalt-manganese lithium manganese oxide power soft-pack battery assembly method comprises the following steps:

[0078] (1) Do a special charge and discharge process for all the cells to be assembled, specifically follow the steps below:

[0079] (1-1) Stand still for 5 minutes;

[0080] (1-2) 20A constant current charging to 4.0V;

[0081] (1-3) Stand still for 5 minutes; and test the voltage V of the cell at this time 1 , V 1 All in the range of 3.7 ~ 3.85V;

[0082] (1-4) 4A constant current charging to 4.2V;

[0083] (1-5) 4.2V constant voltage charging to 2A;

[0084] (1-6) Stand still for 5 minutes;

[0085] (1-7) 20A constant current discharge to 3.0V;

[0086] (1-8) Stand still for 5 minutes; and test the voltage V of the cell at this time 2 , V 2 All in the range of 3.1 ~ 3.3V;

[0087] (1-9) 4A constant current discharge to 2.8V;

[0088] (1-10) stand sti...

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Abstract

The invention discloses a lithium ion power battery cell grouping method, and the method comprises the following steps: charging and discharging cells, acquiring charging and discharging polarization voltage, and calculating a polarization resistance ratio; grading the battery cells according to the polarization resistance ratio r of the battery cells; removing the abnormal points of the inventory, the alternating-current internal resistance and the self-discharge parameters of the graded battery cells; and automatically grouping the cells of the same level through series-parallel connection. According to the method, the polarization impedance in the actual charging and discharging process of the battery cell is considered and is added to matching, compared with a method of grouping by capacity, the overall capacity exertion of the battery cell pack is remarkably improved, the capacity conversion rate is improved to 93%-95% from the original 85%-92%, module heat production is reduced, and internal friction is reduced. The operation is simple and feasible.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries, and in particular relates to a lithium-ion power battery cell assembly method. Background technique [0002] As a green battery, lithium-ion power battery has the advantages of high energy density, high working voltage, high safety performance and long service life. [0003] At present, the commonly used grouping schemes in the lithium battery industry are basically grouped by capacity, and only scattered points are excluded for parameters such as the liquid retention capacity, internal resistance, self-discharge, and shipping voltage of the cells. This grouping scheme only considers the static state of the battery cells, while ignoring the dynamic changes of the batteries during the working process. In this way, the capacity of lithium-ion batteries after grouping is lower than that of single batteries, which directly leads to insufficient cruising range of vehicles, and als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/44B07C5/344
CPCH01M10/0404H01M10/44B07C5/344Y02P70/50Y02E60/10
Inventor 王灵君窦元运
Owner WUHU ETC BATTERY LTD
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