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Secondary lithium ion battery in large multiplying power

A secondary battery and lithium-ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of limiting high-rate discharge, not meeting the requirements of electric tools and electric toys, and low ion conductivity , to achieve the effect of enhancing ion conductivity, reducing ion conduction resistance, and high ion conductivity

Active Publication Date: 2006-02-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low ionic conductivity of the gel state or plasticized electrolyte, its high-rate discharge is limited, and it still cannot meet the requirements of electric tools and electric toys.

Method used

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  • Secondary lithium ion battery in large multiplying power
  • Secondary lithium ion battery in large multiplying power
  • Secondary lithium ion battery in large multiplying power

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix lithium cobalt oxide, hexyne black conductive agent, PVDF polyvinylidene fluoride binder, and NMP nitrogen methyl pyrrolidone solvent, heat and stir to form a slurry, coat it on a 0.02mm thick aluminum foil, and bake it Afterwards, it is cut into strips of 54*880 mm, and finally pressed into a positive electrode sheet 1 with a thickness of 50 μm.

[0024] Mix natural graphite, hexyne black conductive agent, PVDF binder, and NMP solvent, heat and stir to form a slurry, coat it on a 0.012mm thick copper foil, cut it into 55*840mm strips after baking shape, and finally pressed into a negative electrode sheet 2 with a thickness of 60 μm.

[0025] The PE separator 3, the positive electrode sheet 1 and the negative electrode sheet 2 are stacked in the order of separator 3 / positive electrode sheet 1 / diaphragm 3 / negative electrode sheet 2, and then wound into a core body with an outer dimension of 3.2*40*57mm.

[0026] The flexible packaging composite film with PET polyest...

Embodiment 2

[0028] Mix lithium cobalt oxide, hexyne black conductive agent, PVDF polyvinylidene fluoride binder, and NMP nitrogen methyl pyrrolidone solvent, heat and stir to form a slurry, coat it on a 0.02mm thick aluminum foil, and bake it Afterwards, it is cut into strips of 54*520 mm, and finally pressed into a positive electrode sheet 1 with a thickness of 100 μm.

[0029] Mix natural graphite, hexyne black conductive agent, PVDF binder, and NMP solvent, heat and stir to form a slurry, coat it on a 0.012mm thick copper foil, cut it into strips of 55*480mm after baking shape, and finally pressed into a negative electrode sheet 2 with a thickness of 110 μm.

[0030] According to the follow-up process described in Example 1, the obtained capacity is 800mAh, and the external size is 3.8*42*62mm. image 3 The lithium-ion secondary battery shown.

Embodiment 3

[0032] Mix lithium cobalt oxide, hexyne black conductive agent, PVDF binder, and NMP solvent, heat and stir to form a slurry, coat it on a 0.02mm thick aluminum foil, cut it into short pieces of 54*40mm after baking shape, and finally pressed into a positive electrode sheet 1 with a thickness of 100 μm.

[0033] Mix natural graphite, acetylene black conductive agent, PVDF binder, and NMP solvent, heat and stir to form a slurry, coat it on a 0.012mm thick copper foil, cut it into short pieces of 55*40mm after baking , and finally pressed into a negative electrode sheet 2 with a thickness of 110 μm.

[0034] Stack the PE diaphragm 3, positive electrode sheet and negative electrode sheet in the order of diaphragm 3 / positive electrode sheet 1 / diaphragm 2 / negative electrode sheet 1 / diaphragm 3 / positive electrode sheet 1 / diaphragm 3 / negative electrode sheet 2, and the outer dimension is 3.2* 40*57mm core body.

[0035] According to the follow-up process described in Example 1, the...

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Abstract

Thickness of positive plate is optimized to 70 - 120 micros and thickness of negative plate is optimized to 80 ¿C 130 micros so as to reduce resistance of ionic conduction, enhance ionic conducting power, and increase area of ionic conduction. Thus, large multiplying power and large current discharging capability is raised. Composite membrane of soft package is adopted for case shell in order to increase flame resistance of battery. Non-aqueous electrolyte in liquid state is adopted to adapt to discharge in large multiplying power or large current.

Description

【Technical field】: [0001] The invention relates to a lithium ion secondary battery. 【Background technique】: [0002] In recent years, the use of portable electric tools and electric toys has become more and more widespread, and batteries as energy supplies have also attracted increasing attention. Generally, traditional electric tools and electric toys use alkaline secondary batteries such as nickel batteries and nickel-metal hydride batteries. Secondary batteries with better density. Among them, the lithium-ion battery is a secondary battery with faster development of weight energy density and volume energy density. But the lithium-ion battery of prior art also has some deficiencies. [0003] First of all, the high rate and high current discharge performance still needs to be improved. The discharge performance of lithium-ion batteries is mainly determined by the ionic conductivity and electronic conductivity. During discharge, the positively charged lithium ions escape...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/38H01M10/0525
CPCY02E60/122H01M10/0525Y02E60/10
Inventor 梁世硕肖峰
Owner BYD CO LTD
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