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Matching method of lithium ion batteries

A lithium-ion battery and battery technology, which is applied in the manufacture of non-aqueous electrolyte batteries, electrolyte batteries, secondary battery repair/maintenance, etc., can solve the problems of not fully reflecting the differences of batteries and poor overall performance of battery packs, and achieve high performance Improve and avoid the lack of characterization ability and improve the effect of matching quality

Inactive Publication Date: 2014-12-03
GREAT WALL MOTOR CO LTD
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Problems solved by technology

The disadvantage of this method is that these matching parameters cannot fully reflect the differences between batteries, resulting in poor overall performance of the battery pack after assembly and use.

Method used

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  • Matching method of lithium ion batteries

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] like figure 1 As shown, it is a flowchart of a lithium-ion battery assembly method provided by an embodiment of the present invention, including the following steps:

[0023] Step 1. Discharge the lithium-ion battery in the fully charged state to be matched with the first constant current to the lower limit voltage, and record the discharge capacity Q1.

[0024] For example, the lithium ion battery is lithium manganese oxide battery, its lower limit voltage...

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Abstract

The invention discloses a matching method of lithium ion batteries, relating to lithium ion batteries and being used for more fully reflecting the difference between unit batteries to be matched and improving the battery matching quality and the integral property of a battery pack after matched. The matching method comprises the steps of: discharging a to-be-matched battery in a full-energy state to reach a low limit voltage in a first constant current, recording a discharge capacity Q1; charging to reach an upper limit voltage in a second constant current, recording a charge capacity Q2 and a charge voltage of the battery at intervals of T; charging to a stop current by using the upper limit voltage in a constant voltage form , recording a charge capacity Q3; calculating a capacity quality coefficient lambda; calculating similarity of a characteristic vector of the unit lithium ion battery, meeting the formula of lambda>=lambda0, and a standard characteristic vector to obtain a correlation coefficient; and according to a value of the correlation coefficient, grading according to a grading numerical value range. The invention is used for matching the lithium ion battery.

Description

technical field [0001] The invention relates to lithium ion batteries, in particular to a lithium ion battery assembly method. Background technique [0002] With the development of society, the application of lithium-ion batteries is becoming more and more extensive. In practical applications, in order to meet the requirements of the load, it is often necessary to assemble dozens or even hundreds of single cells in series or in parallel to meet the needs of high voltage and high capacity. The theory requires that the internal resistance, capacity and other parameters of these batteries should be as consistent as possible, so that the power released by the battery can be maximized. However, 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 interna...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/42
CPCY02E60/10Y02P70/50
Inventor 杨帆黄勇李强朱永利
Owner GREAT WALL MOTOR CO LTD
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