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High power secondary battery system comprising asymmetric charged cells

A battery system and battery unit technology, which is applied in secondary batteries, secondary battery manufacturing, non-aqueous electrolyte storage batteries, etc., can solve the problem that the battery system cannot have superior charging and discharging characteristics, so as to increase the calendar life, improve charging and discharging The effect of the characteristic

Active Publication Date: 2011-06-29
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In conclusion, currently developed battery systems cannot possess superior charging characteristics and superior discharging characteristics at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] A battery system comprising two unit packs was fabricated.

[0036] For its first unit group, the lithium battery cells start with Li 4 Ti 5 o 12 Lithium manganese oxide as a main component of an anode active material and a spinel crystal structure as a main component of a cathode active material were prepared. Also, the lithium battery cell is configured such that the charge capacity of the anode active material is smaller than the charge capacity of the cathode active material. On the other hand, for the second cell group, lithium battery cells were fabricated with lithium iron phosphorus oxide (an olivine compound) as the main component of the cathode active material and hard carbon as the main component of the anode active material.

[0037] The usable capacities of the two types of battery cells are constructed to be almost equal to each other. The two unit groups are connected in parallel to form the whole secondary battery system.

[0038] Therefore, the ope...

example 2

[0040] A battery system comprising two unit packs was fabricated. The first unit group is composed of 5 battery cells connected in series, and the second unit group is composed of 4 battery cells connected in series.

[0041] For its first cell group, the battery cells (lithium cells) start with Li 4 Ti 5 o 12 Lithium manganese oxide as a main component of an anode active material and a spinel crystal structure as a main component of a cathode active material were prepared. On the other hand, for the second unit group, the battery cell (lithium battery cell) has lithium iron phosphorus oxide (an olivine compound) as the main component of the cathode active material, and carbon (a mixture of graphite and hard carbon) as the The main component of the anode active material is made.

[0042] The usable capacities of the two types of battery cells are constructed to be almost equal to each other. The two unit groups are connected in parallel to form the whole secondary battery...

example 3

[0045] A battery system comprising two unit packs was fabricated. The first unit group is formed using 10 battery cells connected in series, and the second unit group is formed using 11 battery units connected in series.

[0046] The battery cells in the first cell group are configured to have high rate discharge characteristics for long calendar life at high charge levels. Specifically, the battery cells of the first unit group are made by using graphite as an anode active material and lithium transition oxide having a spinel crystal structure as a cathode active material.

[0047] The battery cells in the second cell group are configured to have high rate charging characteristics for long calendar life at low charge levels. Specifically, the battery cells of the second unit group use hard carbon as the anode active material, and LiNiO 2 Prepared as a cathode active material.

[0048] Therefore, the operating voltage of the battery system is 40V. At a 50% charge level at ...

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PUM

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Abstract

Disclosed herein is a battery system including two or more kinds of cell lines having different charge and discharge characteristics, wherein each cell line includes one or more battery cells connected in series with each other. In the battery system according to the present invention, the battery cells of at least one cell line exhibit a high-rate charge characteristic, whereas the battery cellsof at least another cell line exhibit a high-rate discharge characteristic. Consequently, the high-rate charge and discharge characteristics are improved, and the balance between the charge and discharge characteristics is maintained, whereby the battery system according to the present invention is used as a power source having a high power.

Description

field of invention [0001] The present invention relates to a high-power secondary battery system including asymmetric charging cells, and more particularly, to a battery system including two or more cell lines having different charging and discharging characteristics, wherein each cell line contains a Or a plurality of battery cells connected in series, the battery cells in at least one cell group have high-speed charging characteristics, and at least the battery cells in another cell group have high-speed discharge characteristics, thereby providing high power. Background of the invention [0002] In recent years, with the gradual development of mobile devices, the demand for mobile devices has also increased, and the demand for secondary batteries as energy sources for mobile devices has also increased sharply. Among them, a lithium secondary battery having a high energy density and a high discharge voltage has been intensively studied and widely used commercially. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/20H01M4/13H01M4/36H01M4/485H01M4/58H01M4/587H02J7/00H02J7/02
CPCY02E60/122H01M4/136H01M10/441H01M10/0413H01M4/131H01M10/052Y02E60/10Y02P70/50H01M50/50H01M50/20
Inventor J·M·保尔森尹晟薰朴洪奎
Owner LG ENERGY SOLUTION LTD
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