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Adsorption powder for reducing oxygen content in lithium ion battery pack, composite support substrate and battery

A lithium-ion battery, composite support technology, used in secondary battery gas removal, secondary battery, battery pack components, etc., can solve the problem of single functionality, reduce battery cycle life, and cell energy density Oxygen state and other problems to achieve the effect of speeding up the reaction speed and ensuring air permeability

Inactive Publication Date: 2020-03-24
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patent has a single function at first, mainly acting on the flame retardant layer, and cannot keep the battery pack in an oxygen-free state.
Second, nothing has been done to address the issue of oxygen release from the cathode material when the temperature rises
There are other patents that add oxygen absorbing additives to the positive electrode of lithium batteries. When the positive electrode is decomposed at high temperature and releases oxygen, it will be quickly absorbed by the oxygen absorbing additive mixed into the positive electrode. However, this method reduces the cycle life of the battery and the energy density of the cell.

Method used

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  • Adsorption powder for reducing oxygen content in lithium ion battery pack, composite support substrate and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An adsorption powder for reducing the oxygen content in lithium-ion battery packs, including iron powder, chloride inorganic salt and diatomite, wherein the mass ratio of iron powder, anhydrous calcium chloride and diatomite is 1:1: 5.

[0035] When assembling the battery, first coat a layer of adhesive on the surface of the support base made of flame-retardant glass fiber material, coat the powder on the surface of the support base, and then attach the support base to the battery pack, and the coated surface is located in the battery pack. One side, adjacent to the shell, prevents the deoxidizer from contacting the module. The thickness of the adsorbed powder is 15mm, and the battery pack is filled with nitrogen to adjust the oxygen content in the battery pack to make it in an oxygen-free state. Once an abnormal temperature rise occurs in the battery core, at the initial stage of temperature rise, the positive electrode slowly releases oxygen, and the iron powder in th...

Embodiment 2

[0037] An adsorption powder for reducing the oxygen content in lithium-ion battery packs, including iron powder, chloride inorganic salt and diatomite, wherein the mass ratio of iron powder, anhydrous calcium chloride and diatomite is 4:2: 5.

[0038] When assembling the battery, first coat a layer of adhesive on the surface of the support base made of flame-retardant ABS material, coat the powder on the surface of the support base, and then attach the support base to the battery pack, and the coated surface is located in the battery pack. One side, adjacent to the casing, prevents the deoxidizer from contacting the module. The thickness of the adsorbed powder is 20mm, and the battery pack is filled with nitrogen to adjust the oxygen content in the battery pack to make it in an oxygen-free state. Once an abnormal temperature rise occurs in the battery core, at the initial stage of temperature rise, the positive electrode slowly releases oxygen, and the iron powder in the coati...

Embodiment 3

[0040] An adsorption powder for reducing the oxygen content in a lithium-ion battery pack, including iron powder, chloride inorganic salt and diatomite, wherein the mass ratio of iron powder, anhydrous calcium chloride and diatomite is 9:3: 5.

[0041]When assembling the battery, first coat a layer of adhesive on the surface of the support base made of flame-retardant polypropylene material, coat the powder on the surface of the support base, and then attach the support base to the battery pack, and the coated surface is located on the battery pack. One side of the pack is adjacent to the shell to prevent the deoxidizer from contacting the module. The thickness of the adsorbed powder is 20mm, and the battery pack is filled with nitrogen to adjust the oxygen content in the battery pack to make it in an anaerobic state. Once an abnormal temperature rise occurs in the battery core, at the initial stage of temperature rise, the positive electrode slowly releases oxygen, and the ir...

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Abstract

The invention provides adsorption powder for reducing the oxygen content in a lithium ion battery pack, a composite support substrate and a battery. The adsorption powder comprises iron powder, chloride inorganic salt and a deoxidizer. The mass of the iron powder is (1-5) times that of the chloride inorganic salt, and the content of the chloride inorganic salt is (0.7-1.2) times that of the deoxidizer. According to the adsorption powder for reducing the oxygen content in the lithium ion battery pack, the composite support substrate and the battery, oxygen and moisture in the battery pack are eliminated, and even the support substrate capable of absorbing oxygen released by the positive electrode of the battery cell during thermal runaway can still be used for preventing and controlling thethermal runaway, so that the safety of a battery system is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to an adsorption powder for reducing the oxygen content in a lithium-ion battery pack, a composite support base and a battery. Background technique [0002] The ideal vehicles to replace fuel vehicles in the future are undoubtedly hybrid electric vehicles (HEV), battery electric vehicles (BEV) and fuel cell vehicles (fuel cell vehicles). Compared with traditional batteries such as nickel metal hydride and lead-acid, lithium-ion batteries have higher energy density, functional density and longer service life. However, with the increase of energy density, its safety issues have also begun to emerge. According to incomplete statistics, since 2019, electric vehicle spontaneous combustion accidents have occurred frequently, and the accidents are often accompanied by smoke, fire and explosion. For the occurrence of spontaneous combustion accidents, mechanical abuse and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/52H01M2/02H01M10/0525A62C3/16
CPCA62C3/16H01M10/0525H01M10/52H01M50/124Y02E60/10
Inventor 纵雪楠张越超高秀玲
Owner TIANJIN ENERGIES
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