Lithium ion power cell with high power

A power battery and lithium-ion technology, which is applied in the field of high-power lithium-ion power batteries, can solve problems such as limited effectiveness, impact on battery life, and potential explosion hazards that limit the scope of application.

Inactive Publication Date: 2008-10-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the early 1990s, a new type of energy storage system—lithium-ion batteries began to mature and entered the market. It was characterized by high capacity, long life, and no pollution. However, at that time, its high price and possible explosion Hidden dangers severely limit its range of applications in daily life, including the field of electric vehicles
[0005] For winding high-power batteries, because the thickness of the tabs and the tab tape is generally greater than the thickness of the electrode material coating, the positive and negative electrodes around the tabs cannot be in good contact and the position of the tabs in the battery core is not good. Drums, which affect the uniformity and stability of the pole piece, and then affect the life of the battery; this structure will also cause the coating of one pole tab to face the other pole, making it easy to form lithium in the gap around the negative pole tab. Dendrites affect safety, the more the number of tabs welded to the pole piece, the more serious the above problems
In response to this problem, some people have adopted a method of shortening the overlapping length of tabs and pole pieces in cylindrical batteries and compacting the overlap between tabs and pole pieces with external for

Method used

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  • Lithium ion power cell with high power
  • Lithium ion power cell with high power
  • Lithium ion power cell with high power

Examples

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Effect test

example 1

[0026] This example is a 10Ah pure lithium manganate power battery with external dimensions (excluding poles) of 70mm × 34mm × 70mm (length × width × height) that can be charged and discharged at 4C, and the minimum diameter of the pole column section is 3-6mm.

[0027] First, use lithium manganate material, carbon black, binder, and solvent to make positive electrode slurry by ultrasonic mixing, in which carbon black accounts for 1-6% of the total solid mass, and the binder accounts for 2-6% of the total solid mass. 6%, and the rest are lithium manganate materials; use natural graphite, carbon black, binder, and solvent to make negative electrode slurry by ultrasonic mixing, in which carbon black accounts for 0.5-6% of the total solid mass, and the binder accounts for 0.5-6% of the total solid mass. 2-6% of the total solid mass, the rest is natural graphite. The gap coating is carried out according to the mass ratio of positive active material to negative active material equa...

example 2

[0034] The specific operation is the same as that of Example 1. For the sake of brevity, the same parts will not be repeated here, except that the number of pole lugs punched out from each positive and negative electrode sheet is 4, and the ultrasonic welding pattern area of ​​the pole lug and the pole post is 3mm 2 . The test shows that the rate discharge performance of 4C, the cycle performance of 1C and the internal resistance of Example 2 are not significantly different from those of Example 1.

example 3

[0036]This example is an 8Ah pure lithium manganate power battery with external dimensions (excluding poles) of 70mm × 34mm × 70mm (length × width × height) that can be charged and discharged at 15C. The diameter of the minimum section of the stainless steel positive pole stud bolt It is 6-10mm, and the diameter of the minimum section of the brass negative pole stud bolt is 4-8mm.

[0037] First, use lithium manganate material, carbon black, binder, and solvent to make positive electrode slurry by ultrasonic mixing, in which carbon black accounts for 1-6% of the total solid mass, and the binder accounts for 2-6% of the total solid mass. 6%, and the rest are lithium manganate materials; use natural graphite, carbon black, binder, and solvent to make negative electrode slurry by ultrasonic mixing, in which carbon black accounts for 0.5-6% of the total solid mass, and the binder accounts for 0.5-6% of the total solid mass. 2-6% of the total solid mass, the rest is natural graphit...

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Abstract

The invention discloses a high-power lithium ion power battery, comprising a plurality of single electrical cores connected in parallel. Each single electrical core consists of an anode plate, a cathode plate, a separator film, and two to eight anode tabs and cathode tabs. The anode tabs and the anode plate are integrated as a whole which is punched on the aluminum foil of the current collector of the anode; the cathode tabs and the cathode plate are integrated as a whole which is punched on the copper foil of the current collector of the cathode. All the tabs of the anodes of the single electrical cores are welded on a positive pole, while all the tabs of the cathodes are welded on a negative pole. By the structure of a variety of single electrical cores connected in parallel and a plurality of tabs integrated as a whole, the high-power lithium ion power battery leads the total essential resistances of the batteries to be further reduced and the currents of the anode and cathode plates to be distributed more uniformly, as a result, the high-power lithium ion power battery has the advantages of small essential resistances in total, high discharge rate, lower possibility of forming lithium dendrites, long cycle life and high specific power etc., and is widely used in electric vehicles, electric tools and other equipment in need of high-power batteries.

Description

technical field [0001] The invention relates to a lithium ion power battery, especially a high-power lithium ion power battery designed for use in electric vehicles and power tools. Background technique [0002] In the early 1990s, a new type of energy storage system, lithium-ion batteries, began to mature and enter the market. It is characterized by high capacity, long life and no pollution, but at that time, its expensive price and possible explosion The hidden dangers seriously limit its application in daily life, including the field of electric vehicles. After more than ten years of development, lithium-ion battery technology has made great progress, but there are still some technical problems that have not been completely solved. Therefore, about 90% of electric vehicles in the country are still in use, which pollutes the environment, has short lifespan, and has high energy consumption. Low-density lead-acid batteries. [0003] In recent years, more and more technical...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/02H01M2/26H01M2/30H01M2/08H01M2/02H01M4/13H01M10/0525H01M50/531H01M50/55
CPCY02E60/122Y02E60/10
Inventor 邱新平郑曦安杰吴方旭朱文涛丁楚南
Owner TSINGHUA UNIV
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