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Electric core construct for lithium ion power cell

A power battery, lithium-ion technology, applied in the field of lithium-ion power batteries, can solve the problems of inability to ensure the alignment and coverage of positive and negative plates, and achieve the effect of improving internal short-circuit problems and enhancing safety and stability.

Inactive Publication Date: 2009-01-28
JIAN UTILITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure does not guarantee that the positive and negative plates can still be well aligned and covered after multiple folds.

Method used

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  • Electric core construct for lithium ion power cell
  • Electric core construct for lithium ion power cell
  • Electric core construct for lithium ion power cell

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Experimental program
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Effect test

Embodiment Construction

[0016] Such as figure 1 , figure 2 , image 3 As shown, the present invention includes a positive pole piece 1, a positive pole lug 2, a diaphragm 5, a negative pole piece 3, and a negative pole lug 4. The positive pole lug 2 is connected to the positive pole piece 1, the negative pole lug 4 is connected to the negative pole piece 3, and the positive pole piece 1 The positive active material is evenly coated on both sides of the aluminum foil. The positive active material is lithium cobalt oxide, lithium manganese oxide, nickel cobalt lithium manganate or lithium iron phosphate or a mixture thereof; the negative plate 3 is uniformly coated with the negative active material. It is composed of cloth on both sides of copper foil, and the negative electrode active material is one or a mixture of natural graphite or artificial graphite. The shape of the positive pole piece 1 is in the shape of a convex monopole ear, and the current is exported to the pole column through the posi...

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Abstract

The invention provides an electrical core structure for a lithium ion power battery, comprising a positive plate, a positive electrode ear, a barrier membrane, a negative plate and a negative electrode ear, wherein the positive plate is formed by evenly coating positive active substances on two surfaces of an aluminum foil, the negative plate is formed by evenly coating negative active substances on two surfaces of a copper foil, the positive plate has a shape of a convex single electrode ear, the barrier membrane is formed by overlapping a double-layer barrier membrane through welding to form a structure which has an opening in one direction and has a shape similar to a paper bag, a plurality of positive plates are respectively arranged inside the barrier membrane bag, the negative plate is folded reciprocally according to the shape of Z, the positive plate is inserted into the two adjacent layers of the negative plates, and the positive plate, the barrier membrane and the negative plate form an electrode aggregate with a semi-overlaying structure. The electrical core structure has the advantages of solving the problems that the negative electrode in the electrical core can not completely wrap the positive electrode and the barrier membrane in the winding of a long electrode plate is overlong and can not correspond orderly, improving the problem of the internal short circuit caused by contractive and deformed barrier membrane, and improving the safe stability of the use of the battery.

Description

technical field [0001] The invention relates to a lithium-ion power battery, in particular to a cell structure of the lithium-ion power battery. Background technique [0002] As a new-generation product, lithium-ion power batteries have gradually become one of the mainstream choices for vehicle power batteries due to their high energy density and power density, no memory effect, small self-discharge, and long cycle life. However, as a high-power and high-capacity lithium-ion power battery, its use technology is limited due to the instability of its safety performance. The charging and discharging voltage of lithium-ion power batteries has very strict requirements on the structure of the battery cell. It is required that the negative electrode of each layer completely cover the positive electrode and be completely separated by a diaphragm. The control requirements are very demanding and difficult. At present, most of the batteries adopt winding or superimposed structures. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40H01M4/02H01M2/18H01M4/13H01M10/0525H01M50/403H01M50/449H01M50/46H01M50/54
CPCY02E60/122Y02E60/10
Inventor 王继生洪良仕王春茂
Owner JIAN UTILITY TECH CO LTD
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