Lithium ion battery intermediate tab roll core

A lithium-ion battery, intermediate pole technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as easy to increase the risk of lithium precipitation, insufficient strength, and increased welding difficulty.

Inactive Publication Date: 2019-08-20
合肥众禾动力新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the industry usually uses the positive middle tab, and the negative tab uses the first and last double tabs, which not only wastes materials, but also increases the difficulty of welding when welding the core winding core and the bottom case, and there is a risk of missing welding.
However, if the middle tab of the negative electrode is used, there will be a risk of lithium precipitation due to the absence of the negative electrode at the welding position.
Moreover, the diaphragm used in the prior art has insufficient electrolyte wettability and insufficient strength, which not only affects the electrical performance and safety of lithium batteries, but also easily increases the risk of lithium analysis.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Diaphragm 3 is prepared by the following method:

[0042] Step S1, weigh 2.1g of cellulose acetate and add it to a mixed solvent composed of 8.4mL of N,N-dimethylacetamide and 5.6mL of acetone, stir for 5h to form a uniform slurry, and spin at a spinning rate of 0.4mL / h. Under the condition that the spinning voltage is 10kV, the slurry is electrospun into a film;

[0043] Step S2, soaking the membrane in 0.05mol / L LiOH aqueous solution for 12 hours, washing it with deionized water for 4 times, and drying it in a vacuum oven at 70°C for 10 hours to obtain a cellulose membrane matrix;

[0044] Step S3, add 8.8g of alumina, 0.12g of sodium carboxymethylcellulose and 14g of deionized water into the ball mill, mill for 60min, add 0.9g of acrylate emulsion, stir for 20min, then add 0.02g of fluoropolyether modified Non-toxic polysiloxane, continue to stir for 5 min to obtain a coating;

[0045] Step S4, uniformly coating the paint on one side of the cellulose film substrat...

Embodiment 2

[0047] Diaphragm 3 is prepared by the following method:

[0048] Step S1. Weigh 2.1g of cellulose acetate and add it to a mixed solvent composed of 8.4mL of N,N-dimethylacetamide and 5.6mL of acetone, stir for 5.5h to form a uniform slurry at a spinning rate of 0.4mL / h, under the condition that the spinning voltage is 10kV, the slurry is electrospun into a film;

[0049] Step S2, soaking the membrane in 0.05mol / L LiOH aqueous solution for 12 hours, washing it with deionized water for 5 times, and drying it in a vacuum oven at 70°C for 11 hours to obtain a cellulose membrane matrix;

[0050] Step S3, add 8.8g of alumina, 0.12g of sodium carboxymethylcellulose and 15g of deionized water into the ball mill, mill for 60min, add 0.9g of acrylate emulsion, stir for 25min, then add 0.03g of fluoropolyether modified Non-toxic polysiloxane, continue to stir for 8 min to obtain the coating;

[0051] Step S4, uniformly coating the coating on one side of the cellulose film substrate, c...

Embodiment 3

[0053] Diaphragm 3 is prepared by the following method:

[0054] Step S1. Weigh 2.1 g of cellulose acetate and add it to a mixed solvent composed of 8.4 mL of N,N-dimethylacetamide and 5.6 mL of acetone, and stir for 6 hours to form a uniform slurry. When the spinning rate is 0.4 mL / h. Under the condition that the spinning voltage is 10kV, the slurry is electrospun into a film;

[0055] Step S2, soaking the membrane in 0.05mol / L LiOH aqueous solution for 12 hours, washing it with deionized water for 5 times, and drying it in a vacuum oven at 70°C for 12 hours to obtain a cellulose membrane substrate;

[0056] Step S3, add 8.8g of alumina, 0.12g of sodium carboxymethylcellulose and 16g of deionized water into the ball mill, mill for 60min, add 0.9g of acrylate emulsion, stir for 30min, then add 0.04g of fluoropolyether modified Non-toxic polysiloxane, continue to stir for 10 min to obtain the coating;

[0057] Step S4, uniformly coating the coating on one side of the cellulo...

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Abstract

The invention discloses a lithium ion battery intermediate tab roll core. The lithium ion battery intermediate tab roll core comprises an intermediate tab cathode plate, an intermediate tab anode plate and a diaphragm, two blank sections are arranged in the middle of a cathode material layer, a cathode tab is fixed at one blank section, the intermediate tab anode plate comprises an anode materiallayer, an anode tab is fixed at the blank section, and the intermediate tab cathode plate, the intermediate tab anode plate and the diaphragm are spirally wound and adhered together; and the anode material layer of the intermediate tab anode plate is wound and adhered with the cathode material layer of the intermediate tab cathode plate in a gapless manner through the diaphragm. According to the invention, the anode material layer of the intermediate tab anode plate is wound and attached to the cathode material layer of the intermediate tab cathode plate in a gapless manner through the diaphragm, namely the anode tab and the cathode material layer are avoided, the surface of the cathode material layer of the intermediate tab cathode plate, which faces the anode tab, is provided with a corresponding groove, and the anode tab is partially accommodated in the groove of the cathode material layer, so that the lithium separation risk caused by no anode at the welding position is avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery middle tab winding core. Background technique [0002] Cylindrical power lithium-ion battery, as a green new energy with high energy density and environmental friendliness, has attracted widespread attention from all over the world. First-class lithium battery manufacturers in Europe, America, Japan and South Korea have started research and development and industrialization of power battery related technologies in the early years. In recent years, domestic enterprises have also carried out a lot of analysis and research work on the life, safety, stability and reliability of power batteries and the consistency of batteries. [0003] At present, in order to reduce the discharge rate of the battery cell due to the high internal resistance of the battery during the rate discharge process of the power battery, it is mainly achieved by r...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0587H01M2/26
CPCH01M10/0525H01M10/0587H01M50/538Y02E60/10Y02P70/50
Inventor 项明王尚陈斌李传旭周云龙
Owner 合肥众禾动力新能源科技有限公司
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