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High safety, high power lithium ion power battery

A power battery, high-safety technology, applied in secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of equipment and user injury, thermal runaway, battery explosion, etc., to achieve good thermal stability performance, good The effect of dynamic performance and good overcharge resistance

Inactive Publication Date: 2007-07-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although lithium-ion batteries have certain advantages in replacing traditional batteries as power sources for electric vehicles, lithium-ion batteries are under abuse or misuse (such as heating, overcharging, over-discharging, short-circuiting, vibration, extrusion, etc.), It will cause a violent reaction inside the battery and generate a lot of heat. If the heat accumulates inside the battery without enough time to dissipate, the battery may leak, smoke, and in severe cases, catch fire or explode, causing different effects on electrical equipment and users. degree of damage, which seriously hinders the process of large-scale lithium-ion batteries
[0004] The currently used lithium-ion battery electrolyte is 1mol / L LiPF 6 EMC: EC: DMC (mass ratio 1:1:1), the battery is prone to thermal runaway when it is overcharged and overheated, causing the battery to explode or burn, causing harm to the equipment and users
Most of the currently used lithium-ion power batteries adopt a wound structure, and there is only one positive and negative electrode sheet of the battery, which is not conducive to high-current discharge of the battery and battery production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Preparation of the positive pole piece: the positive active material is LiMn 2 o 4 , the active material, conductive carbon black, and polytetrafluoroethylene were dissolved in the organic solvent N-methylpyrrolidone (NMP) according to the ratio of 88:7:5 to make a slurry, and the slurry was coated on both sides of the aluminum foil, and the positive electrode was single Surface coating surface density 1 7±0.5mg / cm 2 , after drying at 120-130°C, rolling and cutting to make positive pole pieces.

[0014] The size of the first positive electrode sheet: 1000×78 (unit: mm)

[0015] Second positive plate size: 1050×78 (unit: mm)

[0016] Preparation of the negative electrode sheet: the negative active material is graphite, graphite, sodium carboxymethylcellulose (CMC) polystyrene butadiene rubber (SBR) are dissolved in water at a ratio of 90:3:7 to make a slurry, and the slurry material coated on both sides of the copper foil, negative one-side coated surface density 8 ±...

Embodiment 2

[0027] According to the same procedure as in Example 1, conventional lithium-ion battery electrolyte and three beta-chloroethyl phosphate (TCEP) are configured according to 90-96: 4-10 (mass ratio) to configure the electrolyte used in the cost patent to form an F-type battery , battery constant current limiting voltage, constant voltage limiting current limiting charging and discharging cycle for 3 weeks to fully charged state, heating in a constant temperature drying oven at 150 ℃ for 30 minutes, the results are shown in Table 2

[0028] Table 2 Overcharge resistance of F-type lithium-ion batteries

[0029] (discharge voltage range 4.2-2.75V)

[0030] Battery

[0031] It can be seen from Table 2 that when the content of TCEP is less than 5%, it cannot fully protect the battery from high temperature, and only when the amount of the additive exceeds 5%, can the explosion of the lithium-ion battery be prevented. This is because TCEP decomposes and absorbs hydrogen fr...

Embodiment 3

[0033] According to the same procedure of Example 1, only 1mol / L LiPF 6 The EMC:EC:DMC electrolyte was added with different proportions of cyclohexylbenzene and TCEP at the same time to form the research electrolyte. Form F-type battery, charge and discharge the battery with constant current limiting voltage, constant voltage limiting current limiting charge and discharge cycle for 3 weeks, put it in a fully charged state, overcharge it with 1C-10V or heat it in a constant temperature drying oven at 150°C for 30min, the results are shown in Table 3

[0034] Table 3 Overcharge resistance and high temperature resistance of F-type lithium-ion batteries

[0035]

[0036] It can be seen from examples 1-3 that the additives 5% CHB and 5% TCEP in the electrolyte can prevent the safety of the lithium-ion battery when it is overcharged and at high temperature, and will not have a great impact on the comprehensive electrical properties of the battery. more appropriate additio...

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PUM

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Abstract

This invention relates to the lithium ion batteries with high security and high power for electric bicycles, which is composed of the first anode film, the first cathode film, the second anode film, the second cathode film, separator, electrolyte and battery shell, and the batteries have the laser welding seal. The electrolyte is made of LiPF6, organic solvents, sufficient additive cyclohexyl benzene and flame retardant additive three beta TCEP. The cover of battery is installed with the injecting holes and explosion-prevented films. The winding order from inside to outside of battery core is the first anode film, separator, the first cathode film, separator, the second anode films, separator, the second cathode film, separator.

Description

technical field [0001] The invention designs a lithium-ion secondary battery, in particular relates to a high-safety, high-powered lithium-ion power battery suitable for electric bicycles. Background technique [0002] Due to the requirements of environmental protection and energy saving, the demand for energy in today's world is becoming more and more urgent. Therefore, it is an inevitable trend of social development and scientific progress to seek high-efficiency and clean power sources. The power batteries currently being used and developed mainly include lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries. Compared with other power batteries, lithium-ion batteries have high specific energy (120-150Wh / kg), high specific power (250-350W / kg), and long life (500-1000 cycles). The energy density has reached 3-4 times that of lead-acid batteries and 2 times that of nickel-metal hydride batteries, and the specific energy is h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/38H01M4/02H01M4/58H01M4/48H01M2/12H01M50/342
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 唐致远陈玉红王倩贺艳兵
Owner TIANJIN UNIV
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