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Lithium ion battery, preparation method and battery pack

A lithium-ion battery and electrolyte technology, which is applied in battery pack parts, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problems of reducing battery energy density, tabs occupying space and weight, affecting battery quality and FTY, etc. , to achieve the effects of increased volumetric energy density, easy battery safety, and guaranteed battery safety

Pending Publication Date: 2021-07-16
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tabs need to occupy space and weight, which reduces the energy density of the battery
At the same time, the welding of tabs and pre-welding of tabs greatly affect the quality of batteries and FTY

Method used

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  • Lithium ion battery, preparation method and battery pack
  • Lithium ion battery, preparation method and battery pack
  • Lithium ion battery, preparation method and battery pack

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] The following is the preparation method of the above-mentioned lithium-ion battery:

[0049] Prepare the positive electrode sheet with a thickness of 100-600um and the negative electrode sheet with a thickness of 100-600um, stack the sheets first and then package them around in the order of the positive electrode sheet, separator and negative electrode sheet. 1-1 / negative current collector 1-3 and active material layer, i.e. positive electrode active material layer 1-2 / negative electrode active material layer 1-4, to obtain a lithium ion battery (such as figure 1 ). The lithium-ion battery shell is not only the encapsulation layer, but also the current collector. The positive current collector can be Al with a thickness of 14-200um, and the negative current collector can be Cu, Ni, Cu / Al with a thickness of 8-150um. In addition, positive / The negative current collector can also be an organic current collector made of conductive polymer. In order to improve the combina...

Embodiment 1

[0060] Add 42.43g of LFP and 1.31g of Ketjen Black into the mixing tank for pre-mixing for 10min, then add 13.47g of electrolyte solution and vacuum dry mix for 10min (turn on the cooling water, keep the temperature <10°C), mold it, and transfer it to a 20um thick On the Al foil, cut the positive electrode sheet; add 20.20g of graphite and 0.31g of conductive carbon black to the mixing tank for pre-mixing for 10min, then add 7.15g of electrolyte solution and vacuum dry mix for 10min (turn on the cooling water and keep the temperature <10°C). Mold forming, transferred to Cu foil with a thickness of 10um, and cut to obtain the negative electrode sheet; stacked together in the order of positive electrode sheet, separator, and negative electrode sheet; using MPP / PP / MPP film with a thickness of 30um / 50um / 30um at 185°C Heat sealing for 5s to realize packaging; the final battery is obtained after leveling.

Embodiment 2

[0062] Add 42.43g of LFP and 1.31g of Ketjen Black to the mixing tank for pre-mixing for 10min, then add 16.46g of electrolyte and vacuum dry mix for 10min (turn on the cooling water and keep the temperature <10°C), mold it, and transfer it to a 20um thick On the Al foil, cut the positive electrode sheet; add 20.20g of graphite and 0.31g of conductive carbon black to the mixing tank for pre-mixing for 10min, then add 8.80g of electrolyte solution for vacuum dry mixing for 10min (turn on the cooling water, keep the temperature <10°C), and Mold forming, transferred to Cu foil with a thickness of 10um, and cut to obtain the negative electrode sheet; stacked together in the order of positive electrode sheet, separator, and negative electrode sheet; using MPP / PP / MPP film with a thickness of 30um / 50um / 30um at 185°C Heat sealing for 5s to realize packaging; the final battery is obtained after leveling.

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Abstract

The invention provides a lithium ion battery, a preparation method and a battery pack. The lithium ion battery, namely a paper battery, is formed by stacking a positive plate, a diaphragm and a negative plate and packaging the same with an outer package, and the outer package is not only used as a packaging layer, but also used as a current collector. The preparation method comprises the steps of preparation of the positive plate, preparation of the negative plate and assembly of the paper battery. The lithium ion battery pack is formed by connecting the paper batteries in series or in parallel. According to the lithium ion battery, the preparation method and the battery pack of the invention, a new packaging mode is adopted, and a Tab is not used any more. The new packaging mode saves the space of the Tab, improves the energy density of the battery, and is fast in heat dissipation, in addition, the packaging mode is convenient for manufacturing a special-shaped battery; the cost of battery cell materials can be reduced by 17%; the manufacturing cost of battery cells can be reduced by 30%; the volume energy density of the battery cells is improved by 20%, and the mass energy density is improved by 5%; and the safety of the battery is easier to guarantee.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery, a preparation method and a battery pack. Background technique [0002] Existing lithium-ion batteries are generally packaged in steel shells, aluminum shells, and aluminum-plastic films, and are connected to loads through metal current collectors with external tabs, so as to realize charging and discharging of lithium-ion batteries. The Tab chip needs to occupy space and weight, which reduces the energy density of the battery. At the same time, the welding of tabs and pre-welding of tabs greatly affect the quality and FTY of batteries. Contents of the invention [0003] In order to overcome the influence of tabs, the present invention proposes a new lithium-ion battery and a preparation method without using tabs, and the new packaging method saves the space of tabs, improves the energy density of the battery, and simultaneously dissipates h...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058H01M4/66H01M50/102H01M50/509
CPCH01M10/0525H01M10/058H01M4/66Y02P70/50Y02E60/10
Inventor 王雷申永宽程骞
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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