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High-power lithium ion battery system with laminated battery structure

A technology for lithium-ion batteries and stacked batteries, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of battery internal pressure rise, lithium battery explosion, and aggravated electrolyte corrosion of electrode materials, etc., to prevent Explosion, improved safety, beneficial to the effect of system integration

Inactive Publication Date: 2011-05-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the temperature rise of the electrolyte caused by high-current charging and discharging causes the electrolyte to vaporize and increase the internal pressure of the battery.
On the other hand, the increase of the temperature of the electrolyte will also intensify the corrosion of the electrode material by the electrolyte to generate gas, which will also lead to an increase in the internal pressure of the battery, which will easily cause the lithium battery to explode during the high-current charging and discharging process.

Method used

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  • High-power lithium ion battery system with laminated battery structure
  • High-power lithium ion battery system with laminated battery structure
  • High-power lithium ion battery system with laminated battery structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Air-cooled battery system.

[0032] Take lithium-ion battery cathode material (104) LiCoO 2 Mix it mechanically with acetylene black and polyacrylic acid (5wt%) at a mass ratio of 95:5:5 for 10 minutes to prepare a paste, apply it to carbon paper (103), and dry in the shade. at 20 Kg cm -2 Press-molded under pressure as the positive electrode.

[0033] Take lithium-ion battery negative electrode material (106) acetylene black and polyacrylic acid solution (5wt%) at a mass ratio of 1:1, mix mechanically for 10 minutes, make a paste, apply it on carbon paper (107), and dry in the shade. at 20 Kg cm -2 Press-molded under high pressure as the negative electrode.

[0034] The electrode material sides of the positive and negative electrodes face each other to form a sandwich structure with the diaphragm (105), and the diaphragm is a microporous polypropylene film. The carbon paper sides of the positive and negative electrodes are respectively separated by s...

Embodiment 2

[0038] Embodiment 2: water-cooled battery system.

[0039] Take lithium-ion battery cathode material (104) LiFePO 4 Mix it mechanically with acetylene black and Nafion solution (5wt%) at a mass ratio of 95:5:20 for 30 minutes to make a paste, apply it to carbon paper (103), and dry in the shade. at 100 Kg cm -2 Press-molded under pressure as the positive electrode.

[0040] Take lithium-ion battery negative electrode material (106) acetylene black and Nafion solution (5wt%) at a mass ratio of 1:4, mechanically mix for 30 minutes, prepare a paste, apply it on carbon paper (107), and dry in the shade. at 50 Kg cm -2 Press-molded under high pressure as the negative electrode.

[0041] The positive and negative electrodes were respectively immersed in the lithium-ion battery electrolyte for 60 o C is heated for 30 minutes to carry out lithium ionization treatment, so that the binder Nafion resin exists in the form of lithium ion Nafion resin. Electrolyte with LiPF 6 As the ...

Embodiment 3

[0046] Embodiment 3: Air-cooled battery system.

[0047] Take lithium-ion battery cathode material (104) LiMnO 2 Mix it mechanically with acetylene black and polyacrylic acid (5wt%) at a mass ratio of 95:5:10 for 20 minutes to make a paste, apply it to carbon paper (103), and dry in the shade. at 50 Kg cm -2 Press-molded under pressure as the positive electrode.

[0048] Take lithium-ion battery negative electrode material (106) acetylene black and polyacrylic acid solution (5wt%) at a mass ratio of 1:2, mechanically mix for 20 minutes, make a paste, apply it on carbon paper (107), and dry in the shade. at 50 Kg cm -2 Press-molded under high pressure as the negative electrode.

[0049] The electrode material sides of the positive and negative electrodes face each other to form a sandwich structure with the diaphragm (105), and the diaphragm is a microporous polypropylene film. The carbon paper sides of the positive and negative electrodes are respectively separated by sep...

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Abstract

The invention relates to a lithium ion battery, and aims at providing a high-power lithium ion battery system with a laminated battery structure. The battery system comprises at least two single battery structures, adjacent single battery structures are separated by baffle plates, the laminated battery structure is formed by repeated arrangement of the single battery structures; electrolyte anodeand cathode outlet and inlet channels are respectively arranged on the baffle plates on two ends, two sides of the baffle plates arranged at the middle are both provided with an electrolyte flow path, and the flow paths arranged at the two sides are not communicated; and a piezoelectric pump and a radiating fin are respectively arranged between the electrolyte cathode outlet channel and electrolyte anode inlet channel and between the electrolyte anode outlet channel and the electrolyte cathode inlet channel, or the positions of the piezoelectric pump and the radiating fin are exchanged. By virtue of the battery system, the temperature rise of the lithium ion battery can be effectively suppressed during heavy current charging and discharging, the vaporization of an electrolyte is avoided, the explosion of the lithium ion battery duo to the rise of an internal pressure is effectively prevented, and the use safety of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to a lithium-ion battery, especially a high-power lithium-ion battery system. The battery system has a laminated battery structure, and uses electrolyte circulating cooling to control the temperature rise of the lithium battery during high-current charging and discharging, and prevents the battery from occurring due to the vaporization of the electrolyte. The stack exploded. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. At present, lithium-ion batteries use lithium cobalt oxide (LiCoO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/50H01M4/1391H01M2/16H01M2/18H01M10/613H01M10/654H01M10/6554
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 李洲鹏刘宾虹
Owner ZHEJIANG UNIV
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