Self-heated battery based on carbon nanotube film and method for fabricating same

A carbon nanotube film and carbon nanotube technology are applied in the field of self-heating batteries based on carbon nanotube films and their preparation, and can solve the problems of poor temperature control detection accuracy, damage to batteries and diaphragms, and complex self-heating systems. , to achieve the effect of high heating efficiency, uniform heating, and high heat energy conversion rate.

Inactive Publication Date: 2019-05-31
北京旭江科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent (CN104064836A) discloses a low-temperature self-heating method for lithium-ion batteries. This method uses the pulse battery amplitude charging and discharging method to realize low-temperature self-heating for lithium-ion batteries. This method requires charging devices, heating equipment, and battery management systems. etc., the entire self-heating system is more complex, larger in size, and far away from wide application
Chinese patent (CN206976535U) discloses a method for rapidly heating a battery. In this method, a metal heating sheet is placed inside the battery cell, and two tabs are drawn out. When in use, the positive and negative poles of the battery are directly connected to the tabs of the heating sheet. This method can realize rapid heating of the battery core, but the temperature and time need to be strictly controlled during rapid heating, otherwise it will cause diaphragm closure, short circuit, electrolyte decomposition, low safety factor, complex circuit design, and poor temperature control detection accuracy and other shortcomings, and the metal heating sheet also has a damaging effect on the battery cell and diaphragm, and it is easy to pierce the diaphragm and current collector under the action of external force

Method used

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  • Self-heated battery based on carbon nanotube film and method for fabricating same

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Experimental program
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Effect test

Embodiment approach

[0046] An implementation, such as figure 1 As shown, the self-heating battery can include two groups of pole pieces, each group of pole pieces is separated by a flexible carbon nanotube film 1 and the first diaphragm 2, and each group of pole pieces includes a positive pole piece 3, a negative pole piece 4, a separator Open the second diaphragm 5 of the positive and negative plates and the electrolyte ( figure 1 not shown). The positive electrode sheet 3 is provided with a positive electrode tab 31, the negative electrode sheet 4 is provided with a negative electrode tab 41, the positive electrode tab 31 and the negative electrode tab 41 are located on different sides of the battery, and the flexible carbon nanotube film 1 is correspondingly provided with the positive electrode tab 31. The first tab 11 on the same side and the second tab 12 on the same side as the negative tab 41 .

[0047] In the present disclosure, the electrolyte is well known to those skilled in the art....

Embodiment 1

[0063] Preparation of flexible carbon nanotube film: take a certain amount of ferrocene (control concentration 2mg / mL) and thiophene (control concentration 3μL / mL -1 ) into a mixed solution of methanol and n-hexane (volume ratio 9:1), and ultrasonically disperse for 10 min to make the solution evenly mixed. Assemble the quartz tube, collector and reaction furnace, and seal the reaction chamber; -1 Raise the temperature of the high-temperature resistance furnace to the reaction temperature of 1200°C at a rate of 1200°C, and pass the reaction solution into the reaction high-temperature zone through a peristaltic pump under an argon atmosphere (flow rate 30mL·h -1 ); After 20 minutes of reaction, the carbon nanotube macroscopic body can be seen to be generated from the quartz tube mouth. Then, the ethanol aqueous solution with a volume fraction of 20% is sprayed on the surface of the substrate; then, the carbon nanotube macroscopic body generated from the reactor port is adhered...

Embodiment 2

[0070] It is basically the same as Example 1, except that the thickness of the high-strength flexible carbon nanotube film is controlled to be 20 μm, and the surface density is 0.8 mg / cm 2 .

[0071] The heating time of the performance test is 5 minutes, and the capacity retention rate is 90%.

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Abstract

The present disclosure relates to a self-heated battery based on a carbon nanotube film and a method for fabricating the same. The self-heated battery comprises a battery case, an electrode sheet group disposed in the battery case, and a flexible carbon nanotube film. The flexible carbon nanotube film and the electrode sheet group are separated by a first diaphragm. The electrode sheet group includes a positive electrode sheet, a negative electrode sheet, a second diaphragm, and an electrolyte. The second diaphragm separates the positive electrode sheet from the negative electrode sheet. The electrolyte fills a space among the positive electrode sheet, the negative electrode sheet and the second diaphragm. The positive electrode sheet is provided with a positive electrode tab. The negativeelectrode sheet is provided with a negative electrode tab. The flexible carbon nanotube film is provided with a first tab connected to the positive electrode tab and a second tab connected to the negative electrode tab. The self-heated battery provided by the present disclosure has a fast heating rate and high heating efficiency, and is safe and reliable.

Description

technical field [0001] The present disclosure relates to the technical field of batteries, in particular to a carbon nanotube film-based self-heating battery and a preparation method thereof. Background technique [0002] With the rapid development of high technology, mobile and portable electronic devices have brought great convenience to human beings. However, as the requirements for the use of electronic devices are getting higher and higher, the performance standards for batteries are also getting higher and higher, such as battery life, Low-temperature environment uses standby time, battery energy density, etc.; at present, the capacity of lithium-ion batteries at low temperatures from -20 to -45°C is only about 10%-30% under normal conditions. In Northeast my country, there is a problem that mobile phones cannot be turned on. affect people's lives. Since the conductivity of the active material of the battery, the mobility of the electrolyte lithium ion, and the electroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/615H01M10/617H01M10/623H01M10/653H01M10/654H01M10/6571H01M4/66
CPCY02E60/10Y02P70/50
Inventor 王清辉史晨星杨鹏李华锋吴子平
Owner 北京旭江科技有限公司
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