Lithium ion secondary battery

A secondary battery, lithium ion technology, used in secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as battery temperature rise, suppress the sharp rise in temperature, eliminate hidden dangers of safety problems, and reduce the occurrence of The effects of violent chemical reactions

Inactive Publication Date: 2007-09-19
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is that during the use of electronic equipment and communication equipment, the failure of the protection circuit board will cause the battery to overcharge and generate heat, and the accumulation of heat will increase the internal temperature of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Manufacture the positive and negative plates according to the above method, and mix 10 parts of polymer polyvinylidene fluoride (PVdF) and 20 parts of solvent N-methylpyrrolidone (NMP) according to the above method of preparing polymer carrier coating solution Stir and dissolve at 60°C, add 8 parts of alumina (Al 2 o 3 ) and 5 parts of volatile additive n-butanol, stirring at high speed to disperse the flame retardant and volatile additive evenly. The coating solution was coated on the upper and lower surfaces of the positive electrode and the negative electrode by coating, and the coating thickness was 8 μm. The electrode piece was baked in a vacuum oven at 90° C. for 2 hours to remove the NMP solvent and volatile additives to obtain a polymer carrier coating with a thickness of 5 μm. al 2 o 3 The proportion by weight in the polymer washcoat is 44%.

[0035] The polyethylene separator, positive electrode sheet and negative electrode sheet are stacked or wound into...

Embodiment 2

[0037] Manufacture positive and negative plates according to the above method, and according to the above method for preparing polymer carrier coating solution, mix 10 parts of vinylidene fluoride-hexafluoropropylene copolymer (P(VdF-HFP)) and 25 parts of solvent N- Methylpyrrolidone (NMP) was mixed and dissolved under stirring at 60°C, and 22 parts of aluminum oxide (Al 2 o 3 ) and 5 parts of volatile additive n-butanol, stirring at high speed to disperse the flame retardant and volatile additive evenly. The coating solution was coated on the upper and lower surfaces of the positive electrode and the negative electrode by coating, and the coating thickness was 8 μm. The electrode piece was baked in a vacuum oven at 90° C. for 2 hours to remove the NMP solvent and volatile additives to obtain a polymer carrier coating with a thickness of 5 μm. al 2 o 3 The proportion by weight in the polymer washcoat is 68%. According to the method for making the battery in Example 1, a s...

Embodiment 3

[0039] Manufacture the positive and negative plates according to the above method, and mix 100 parts of polymer polyvinylidene fluoride (PVdF) and 180 parts of solvent dimethylformamide (DMF) according to the above method of preparing polymer carrier coating solution Stir and dissolve at 60°C, add 1.1 parts of magnesium oxide (MgO) with an average diameter of 2 μm and 20 parts of volatile additive n-butanol, stir at high speed to disperse the flame retardant and volatile additive evenly. The coating solution was coated on the upper and lower surfaces of the positive electrode and the negative electrode by coating, and the coating thickness was 8 μm. The electrode piece was baked in a vacuum oven at 90° C. for 2 hours to remove the NMP solvent and volatile additives to obtain a polymer carrier coating with a thickness of 5 μm. The weight proportion of MgO in the polymer washcoat is 1%. According to the method for making the battery in Example 1, a square lithium-ion secondary ...

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PUM

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Abstract

This invention relates to a Li ionic secondary battery, a polymer carrier coating composed of a polymer and a flammable inhibitor is coated on the surface of a plate of the positive or negative, in which, the weight percentage of the flammable inhibitor in the polymer carrier coating is 1-7%, the polymer is 99-30% which has the advantages of anti-extrusion, good surcharge-proof and safety performances.

Description

【Technical field】 [0001] The invention relates to batteries, in particular to a lithium-ion secondary battery with good extrusion resistance, overcharge resistance and safety. 【Background technique】 [0002] In recent years, lithium-ion secondary batteries, which have better gravimetric energy density and volumetric energy density than alkaline secondary batteries such as nickel separators and nickel-metal hydride, have been widely used in modern mobile electronic devices and communication devices, such as mobile phones and notebook computers. , handheld computers, personal digital assistants (PDA), small cameras, digital cameras, portable DVD / VCD and MP3 players, etc. [0003] However, lithium ion secondary batteries have safety problems. For example, sometimes there are many bumps with a height of several microns on the surface of the positive and negative electrodes of the battery. The separator between them is scratched or punctured, causing the positive and negative e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/38H01M10/0525
CPCH01M4/13H01M10/0525Y02E60/122Y02E60/10
Inventor 梁世硕
Owner SHANGHAI BYD
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