Safe flexible package lithium ion battery tab

A lithium-ion battery and flexible packaging technology, applied in the field of lithium-ion batteries, can solve problems such as external and internal thermal runaway, and achieve the effects of saving manufacturing costs, preventing further reactions, and controlling thermal runaway

Inactive Publication Date: 2018-02-06
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method to improve the safety of lithium-ion batteries by applying a PTC (Positive Temperature Coefficient) coating on the battery tabs. The PTC coating helps control the heat generated during short-circuits, overcharging, or over-discharging of the battery, preventing dangerous situations like fire or explosion. Applying the PTC coating on the tabs is simpler and more cost-effective than applying it on the pole pieces. The PTC material used has a temperature coefficient that matches well with lithium-ion batteries, effectively blocking current when the battery temperature reaches a dangerous level. Overall, this method enhances the safety of lithium-ion batteries by controlling thermal runaway.

Problems solved by technology

This technical problem addressed in this patents relates to improving the security of laminate type secondary cells used for transport applications while ensuring they operate safely under various operating environments including extreme temperatures. Current methods involve adding insulation layers made of materials like polyethylene terepthalate plastic films to improve safety measures. These techniques aim to detect potential issues beforehand and take appropriate actions accordingly.

Method used

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  • Safe flexible package lithium ion battery tab

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A safe soft-packaged lithium-ion battery lug includes a positive pole, a negative pole lug body, and a PTC coating coated on the surface of the positive and negative pole lug bodies.

[0027] The positive tab body is made of aluminum-based material, and the negative tab body is made of nickel-plated copper. The thickness of one side of the PTC coating is 4 microns, and it is formed by curing PTC slurry, and the PTC slurry includes a PTC matrix material, a dispersant, a binder and a solvent.

[0028] The PTC matrix material is BaTiO 3 . The dispersant is polyethylene glycol octylphenyl ether. The binder is polymethyl methacrylate. The solvent is N-methylpyrrolidone.

[0029] Among them, the ratio of PTC matrix material, dispersant, binder and solvent is 80:10:10:190.

[0030] The preparation method of the above-mentioned safe soft-packaged lithium-ion battery tabs is as follows:

[0031] Dissolve the binder in a solvent to prepare a binder glue, then mix the PTC matri

Embodiment 2

[0033] A safe soft-packaged lithium-ion battery lug includes a positive pole, a negative pole lug body, and a PTC coating coated on the surface of the positive and negative pole lug bodies.

[0034] The positive tab body is made of aluminum-based material, and the negative tab body is made of nickel-plated copper. The PTC coating has a thickness of 3 microns on one side and is formed by curing PTC slurry, and the PTC slurry includes a PTC matrix material, a dispersant, a binder and a solvent.

[0035] The PTC matrix material is BaPbO 3 . The dispersant is polyethylene oxide. The binder is cellulose acetate. The solvent is N-methylpyrrolidone.

[0036] Wherein, the ratio of PTC matrix material, dispersant, binder and solvent is 50:25:25:450.

[0037] The preparation method of the above-mentioned safe soft-packaged lithium-ion battery tabs is as follows:

[0038] Dissolve the binder in a solvent to prepare a binder glue, then mix the PTC matrix material, dispersant and binder

Embodiment 3

[0040] A safe soft-packaged lithium-ion battery lug includes a positive pole, a negative pole lug body, and a PTC coating coated on the surface of the positive and negative pole lug bodies.

[0041] The positive tab body is made of aluminum-based material, and the negative tab body is made of nickel-plated copper. The PTC coating has a thickness of 5 microns on one side and is formed by curing PTC slurry, and the PTC slurry includes a PTC matrix material, a dispersant, a binder and a solvent.

[0042]The PTC matrix material is composed of equal mass BaTiO 3 , BaPbO 3 composition. The dispersant is polyacrylic acid. The binder is a mixture of polymethyl methacrylate, pullulan and carboxymethyl cellulose; the solvent is N-methylpyrrolidone.

[0043] Among them, the ratio of PTC matrix material, dispersant, binder and solvent is 90:1:9:180.

[0044] The preparation method of the above-mentioned safe soft-packaged lithium-ion battery tabs is as follows:

[0045] Dissolve the bi

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Abstract

The invention relates to the field of lithium ion batteries and discloses a safe flexible package lithium ion battery tab. The tab comprises a tab body and a PTC coating applied to the surface of thetab body, wherein the PTC coating is formed by curing PTC slurry, and the PTC slurry comprises a PTC base material, a dispersant, a binder and a solvent; the PTC base material is selected from at least one of BaTiO3 and BaPbO3. The PTC material is applied to positive and negative tabs of a flexible package lithium battery, so that thermal runaway of the battery is effectively controlled, and the safety of the battery is greatly improved.

Description

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Claims

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Application Information

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Owner WANXIANG 123 CO LTD
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