Laminated battery cell and lithium ion battery

A lithium-ion battery and cell technology, applied in lithium batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of increasing cost and battery quality, reducing battery first efficiency and capacity, and increasing battery temperature. Achieve the effect of solving curl damage, offset stress, and reduce internal temperature

Inactive Publication Date: 2021-01-26
ZHUHAI COSMX POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method will cause the following problems: waste the active material on the other side, increase the cost and quality of the battery, reduce the first effect and capacity of the battery, and reduce the energy density
[0003] In addition, when the lithium battery is discharged, a chemical reaction will occur inside the battery, which will generate a large amount of heat energy and cause the temperature of the battery to rise.
When the heat generated inside the battery cannot be discharged in time, it is easy to cause thermal runaway of the battery, and in severe cases, accidents such as battery fire and explosion may occur

Method used

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  • Laminated battery cell and lithium ion battery
  • Laminated battery cell and lithium ion battery
  • Laminated battery cell and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Prepare a positive electrode sheet P0 with one side coated with active material and one side coated with heat dissipation and flame retardant hot melt adhesive coating

[0055] The positive electrode active material ternary nickel-cobalt-manganese (NCM), binder PVDF and conductive carbon black are mixed, and a uniformly dispersed mixture is obtained by high-speed stirring. In the mixture, the solid content contained 95wt% NCM, 2wt% binder PVDF and 3wt% conductive carbon black. The mixture uses N-methylpyrrolidone as a solvent to prepare positive electrode active material slurry, and the solid content in the slurry is 70 wt%. The slurry was evenly coated on one side of the positive electrode current collector aluminum foil, and dried to obtain a single side coating of the positive electrode current collector active material of the aluminum foil, that is, the positive active layer, and the thickness of the coating was 120 μm.

[0056] Mix 60wt% EVA hot melt adhesive ...

Embodiment 2

[0064] (1) Prepare a negative electrode sheet N0 coated with an active material on one side and a heat-dissipating flame-retardant hot-melt adhesive coating on one side

[0065]The negative electrode active material graphite, SBR type binder, thickener sodium carboxymethyl cellulose and conductive carbon black are mixed, and the mixture is uniformly dispersed by high-speed stirring to form a mixture containing the negative electrode active material. In the mixture, the solid component contains 95wt% of graphite, 1.5wt% of sodium carboxymethylcellulose, 1.5wt% of conductive carbon black, and 2wt% of binder. Using deionized water as a solvent, a negative electrode active material slurry was prepared, and the solid content in the slurry was 50 wt%. The slurry was uniformly coated on one side of the copper foil, and dried to obtain a negative electrode sheet coated with an active material on one side, and the coating thickness was 130 μm.

[0066] Mix 60wt% EVA hot melt adhesive ...

Embodiment 3

[0072] The difference between embodiment 3 and embodiment 1 is only that: the hot melt adhesive material EVA in step (1) is replaced by polyurethane hot melt adhesive material. The rest of the steps and operation methods are the same as in Example 1, and the assembled battery is denoted as C3.

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Abstract

The invention provides a laminated battery cell and a lithium ion battery. The laminated battery cell comprises positive plates and negative plates, the positive plates and the negative plates are alternately laminated, and a diaphragm is arranged between every two adjacent pole pieces; each pole piece positioned on the outermost side comprises a current collector, an active layer and a coating, the active layer is positioned on one side, close to the interior of the battery cell, of the current collector, the coating is positioned on one side, far away from the interior of the battery cell, of the current collector, and a heat conduction material and / or a flame-retardant material are / is arranged in the coating. According to the invention, the problems of consumption of active lithium on the outermost layer of the laminated structure and reduction of the first effect and the capacity are solved, the problem of rolling damage caused by rolling stress of a single-sided coating pole pieceis also solved, more importantly, the heat conduction material and / or the flame retardant material can improve the safety performance of the laminated core, such as heat dissipation and flame retardance, and the safety and the practicability of the battery cell are greatly improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a laminated battery cell and a lithium ion battery. Background technique [0002] In the current stacked lithium-ion battery, considering safety and practicality, the negative electrode has one more layer than the positive electrode, and the extra layer of negative electrode sheet has negative active materials on both sides of the copper foil current collector, such as graphite or Silicon material, but the negative electrode active material on the outermost negative electrode side has no practical use, but has some negative effects: on the one hand, it increases the weight of the battery cell and reduces the energy density of the battery cell; The formation of the SEI film consumes more lithium ions, which reduces the first effect of the battery and reduces the capacity of the battery. If the positive and negative current collectors are only coated on one side, the pole pieces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/052H01M10/0525H01M10/0583H01M10/613H01M10/653A62C3/16
CPCA62C3/16H01M4/667H01M10/052H01M10/0525H01M10/0583H01M10/613H01M10/653Y02E60/10Y02P70/50
Inventor 田义军靳玲玲王美丽申红光
Owner ZHUHAI COSMX POWER CO LTD
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