CN108649230B

CN108649230B - Flexible lithium ion battery capable of working in all weather and preparation method thereof

Info

Publication number: CN108649230B
Application number: CN201810339364.0A
Authority: CN
Inventors: 吴子平; 刘开喜; 刘亭; 胡英燕; 尹艳红; 刘先斌; 黎业生
Original assignee: Jiangxi University of Science and Technology
Current assignee: Jiangxi University of Science and Technology
Priority date: 2018-04-16
Filing date: 2018-04-16
Publication date: 2020-12-11
Anticipated expiration: 2038-04-16
Also published as: CN108649230A

Abstract

A flexible lithium ion battery and its preparation method that can work all weather, this battery regards membrane assembled of macroscopic tube continuum of carbon nanotube after stretching as the positive and negative current collectors, in the course of film forming, the membrane is treated by porous and electrolyte infiltration, make the electrolyte can store in the carbon nanotube membrane as current collector, therefore the battery obtained can still work normally in harsh environment such as extreme high temperature, extreme low temperature, vacuum and water; the battery main body comprises a positive electrode plate, a diaphragm and a negative electrode plate which are sequentially stacked. The invention also provides a method for preparing the battery. The invention can effectively solve the problem that the current lithium ion battery fails to store electrolyte because the current collector can not store the electrolyte under the harsh environment, and the manufacturing process is fully connected with the production process of the current mainstream lithium ion battery, thereby being convenient for mass production under the current production condition and having strong practicability.

Description

Flexible lithium ion battery capable of working in all weather and preparation method thereof

Technical Field

The invention relates to a lithium ion secondary battery working in all-weather environment in the battery manufacturing field and a manufacturing method thereof, in particular to a manufacturing method of a flexible lithium ion secondary battery taking a carbon nano tube film absorbing electrolyte as a positive and negative current collector.

Background

As wearable electronic devices silently walk into people's lives, the need for flexible batteries has become one of the technical bottlenecks of these electronic devices. In addition, most wearable electronic devices are directly worn on the outer surface of a human body and directly face changes of external complex environments, such as changes of temperature, changes of external air pressure, influences of rainwater and the like. Thus, these operating environments require that the power supply of the device not only be capable of deformation, but also be capable of adapting to changes in complex environments. However, it is not limited toIt is difficult for commercial batteries currently on the market to meet the above requirements. In order to enable the battery to work at a low temperature, a self-heating system is conventionally arranged inside the battery cell, so that the battery cell is still kept at a normal temperature when the temperature of the battery cell is lower than the external temperature. As in the case of the Lithium-ion battery structure and self-heating at low temperature in 20 seconds, C.Y. Wang et al Nature 2016 (Nature) 2016 (vol.529) 515-518, it was proposed to raise the internal temperature by 20 seconds using an internally mounted self-heating device^oC, so that the battery can normally work below zero degree. The internal structure of the battery is complicated and the weight is increased due to the addition of the internal self-heating system; in addition, these self-heating systems are idle when the temperature is high in summer. When the common commercial lithium ion battery works at a higher temperature, the electrochemical performance of the common commercial lithium ion battery is obviously reduced. The common method for increasing the working temperature of the battery is to add special additives into the electrolyte to remove trace water and avoid the pyrolysis of the electrolyte. For example, in the article "Passion of lithium metal anode via a hybrid electrolytic cell heated stable lithium plating/striping" of N.W. Li et al in Advanced Science, 2017, volume 4, 1600400-1-6, page 4, the mixed electrolyte system of ether electrolyte and ionic liquid is proposed to improve the cycling stability of the electrode. However, such methods still have difficulty in effectively solving the electrochemical performance of the battery at low temperatures, and are difficult to adapt to large-scale production due to the great synthesis difficulty. In addition, wearable devices may encounter difficult weather, such as low pressure environments, high humidity environments, etc., for outdoor enthusiasts and other users. To date, there is no ideal solution to the above-mentioned complex series of problems, and wearable electronics have encountered difficult to overcome. In addition, the flexible current collector used for the flexible battery at present is difficult to prepare in a large area, and the prepared sample has the problems of low conductivity, poor wettability to electrolyte and the like, so that the finally obtained battery is difficult to produce in batches although flexible, low in energy density and short in service life, and is difficult to adapt to the change of the external complex environment. However, the most widely used power source in the 3C field is considered to be a lithium ion secondary battery. In combination with the above-mentioned situation,there is a need to provide a flexible lithium ion secondary battery that is low in cost, good in flexibility, high in energy density, long in life, and adaptable to changes in the external environment.

Disclosure of Invention

The invention aims to provide a flexible lithium ion battery capable of working all weather, which has the characteristics of good flexibility, high energy density, high production efficiency and the like.

The invention is realized by the following technical scheme, the invention relates to a preparation method of a flexible lithium ion battery capable of working all weather, a production method of a raw material carbon nano tube macroscopic tube continuum used by a flexible carbon nano tube film in the invention refers to a patent ZL201310013214.8, and a preparation method of a material-carrying positive electrode sheet and a material-carrying negative electrode sheet refers to a patent ZL 201410702272.6. The method comprises the following steps:

step one, performing pretensioning treatment on a carbon nano tube macroscopic tube continuum. The preparation method of the carbon nanotube macroscopic tube continuum is referred to patent ZL 201310013214.8. The carbon nano tube macroscopic tube continuum is pulled out from the reaction cavity through the mechanical rod, the mechanical rod is made of high-temperature resistant steel or hard alloy, the motion of the mechanical rod is driven by the motor at a constant speed, the speed outside the reaction cavity is 0.5-60 m/min, the speed in the reaction cavity is 0.01-0.5 m/min, the tensile stress of the mechanical rod on the continuum is controlled to be 40-120MPa, and the stress time of the continuum is 1-20 seconds.

And step two, preparing the flexible carbon nanotube macroscopic film. Adhering the stressed carbon nanotube macroscopic tube continuum to a roller covered with a flexible substrate, wherein the flexible substrate comprises but is not limited to paper, carbon cloth, a plastic film, copper foil and aluminum foil, and the diameter of the roller is 1-500 cm. The continuous body is kept on the roller to maintain the tensile stress of 40-120MPa, and the base material is wetted by methanol, ethanol, propanol, water or the mixture of the methanol, the ethanol, the propanol and the water before the continuous body is adhered. To be stretched in tensionAfter the continuous body is wound to the substrate, the substrate is put in 60-150^oAnd C, baking for 30 min-5 h in a baking oven, and tearing off a film formed by the continuous body covering the substrate after baking to obtain the oriented and high-activity carbon nanotube macroscopic film, wherein the size of the film is equal to that of the substrate.

And step three, preparing and assembling the electrode. The carbon nano tube macroscopic film in the step one is adopted as the current collector of the positive and negative electrodes, and the types, loading capacity, coating method and diaphragm of active substances in the positive and negative electrodes refer to patent ZL 201410702272.6. And after preparing the positive and negative electrode plates with double-sided material loading, assembling the whole battery in a lamination mode of the positive plate, the diaphragm, the negative plate, the diaphragm, the positive plate, the diaphragm and the negative plate. The positive and negative pole pieces of the assembled full electrode are 1-10 pieces. The cell is packaged by referring to a packaging material and a packaging method in a patent ZL 201410702272.6.

And step four, the battery cell absorbs the electrolyte. In a dehumidification room or a glove box with the humidity lower than 8%, injecting electrolyte into the outer package of the battery core which is not completely sealed, wherein the injection amount can be obtained according to the method: the electrolyte injection weight (g) = battery capacity (taking mA h as a unit)/n, wherein n is selected from 50-150 according to actual conditions; and (3) after liquid injection, placing the battery in a vacuum drying oven (the vacuum degree is lower than-100 Kpa), standing for 20-40 min under the vacuum condition, and sealing the unsealed side by using an edge sealing machine to complete the manufacture of the full battery.

The invention has the following beneficial effects: firstly, the carbon nanotube macroscopic tube continuum is subjected to stress pre-stretching in the process of leaving the reaction cavity, so that the carbon nanotubes in the continuum are straightened, the order degree of the carbon nanotubes in the continuum is greatly improved, the movement distance of electrons in the continuum is greatly shortened, the resistance of the carbon nanotubes serving as a battery current collector after film forming can be effectively reduced, and the electrochemical performance of the whole battery is improved. Secondly, the continuous body is baked during film forming, so that liquid phases wetting the continuous body are fully volatilized, and gas generated in the volatilization process of the liquid can generate a large number of pores when passing through a formed film, so that more space is provided for storing electrolyte when the film is used as a current collector in the following process; in addition, functional groups such as oxygen-containing groups and hydroxyl groups adsorbed on the surface of the film are volatilized, so that the surface energy of the film is further reduced, and the electrolyte can infiltrate from the surface of the film into the inside of the film, thereby further increasing the amount of the electrolyte stored in the film. When a common battery is in a high-temperature and low-temperature environment, the rapid volatilization or solidification of the electrolyte can cause insufficient contact among the positive and negative pole pieces of the battery, the electrolyte and the current collector, so that the battery can not work. In addition, in low-pressure air, the electrolyte can not work normally when flowing to other positions rapidly due to the inflation of the battery. The electrolyte storage and low resistance function of the carbon nano tube macroscopic membrane with highly oriented arrangement enables the carbon nano tube macroscopic membrane to slowly release the electrolyte from the membrane under extreme weather conditions so as to keep the normal operation of the battery.

Drawings

Fig. 1 is a diagram of electrochemical performance of a lithium ion battery in example 1 of the present invention at an extreme temperature.

Fig. 2 is a graph of electrochemical performance of the lithium ion battery in vacuum and water in example 1 of the present invention.

Detailed Description

The following examples illustrate the invention in detail: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a process are given, but the scope of the present invention is not limited to the following embodiments. Other variations within the spirit of the invention will occur to those skilled in the art and are, of course, within the scope of the invention as claimed.

Example 1

The carbon nanotube macroscopic tube continuum is pre-stretched, and the preparation method of the carbon nanotube macroscopic tube continuum refers to patent ZL 201310013214.8. The carbon nano tube macroscopic tube continuum is pulled out of the reaction cavity through the mechanical rod, the mechanical rod is made of high-temperature-resistant steel or hard alloy, the motion of the mechanical rod is driven by the motor at a constant speed, the speed of the mechanical rod outside the reaction cavity is 0.5 m/min, the speed of the mechanical rod in the reaction cavity is 0.01 m/min, the tensile stress of the mechanical rod on the continuum is controlled to be 120MPa, and the stress time of the continuum is 3 seconds.

Preparing the flexible carbon nanotube macroscopic film by adhering the stressed carbon nanotube macroscopic tube continuum to the coveringA roller covered with a flexible substrate, the flexible substrate being paper, the roller having a diameter of 50 cm. The continuous body is kept on a roller under the tensile stress of 120MPa, and the substrate material needs to be wetted by methanol before the continuous body is adhered. After the stretched continuum is fully wrapped around the substrate, the substrate is placed 150 into the chamber^oAnd C, baking for 30 min in a baking oven, and tearing off a film formed by the continuous body covering the substrate after baking to obtain the oriented and high-activity carbon nanotube macroscopic film, wherein the size of the film is equal to that of the substrate.

The preparation and assembly of the electrode, the carbon nano tube macroscopic film is adopted as the current collector of the positive and negative electrodes, the types, the loading capacity and the coating method of the active materials in the positive and negative electrodes and the diaphragm refer to patent ZL 201410702272.6. And after preparing the positive and negative electrode plates with double-sided material loading, assembling the whole battery in a lamination mode of the positive plate, the diaphragm, the negative plate, the diaphragm, the positive plate, the diaphragm and the negative plate. The positive and negative pole pieces of the whole electrode are assembled into 2 pieces. The cell is packaged by referring to a packaging material and a packaging method in a patent ZL 201410702272.6.

The battery core absorbs the electrolyte. In a dehumidification room or a glove box with the humidity lower than 8%, injecting electrolyte into the outer package of the battery core which is not completely sealed, wherein the injection amount can be obtained according to the method: filling weight (g) = battery capacity (in mA h)/n, wherein n is 50; and (3) after liquid injection, placing the battery in a vacuum drying oven (the vacuum degree is lower than-100 Kpa), standing for 20 min under the vacuum condition, and sealing the unsealed side by using an edge sealing machine to complete the manufacture of the full battery.

In this example, the fabricated battery was cycled between 1.5 and 2.8V at 0.5C, and the specific discharge capacity at 25, 0, -20, -25, -30, -35, -40 ℃ was 164, 162, 125, 115, 88, 30, 13 mA h g^-1The coulombic efficiency of the whole process cell is close to 100%, see fig. 1. The cell can be easily folded and little change in electrochemical properties occurs when the cell is placed in a vacuum environment or in water, see fig. 2.

Example 2

The carbon nanotube macroscopic tube continuum is pre-stretched, and the preparation method of the carbon nanotube macroscopic tube continuum refers to patent ZL 201310013214.8. The carbon nano tube macroscopic tube continuum is pulled out of the reaction cavity through the mechanical rod, the mechanical rod is made of high-temperature-resistant hard alloy, the motion of the mechanical rod is driven by the motor at a constant speed, the speed of the mechanical rod outside the reaction cavity is 10 m/min, the speed of the mechanical rod in the reaction cavity is 0.1 m/min, the tensile stress of the mechanical rod on the continuum is controlled to be 100MPa, and the stress time of the continuum is 10 seconds.

And (3) preparing a flexible carbon nanotube macroscopic film, namely adhering the stressed carbon nanotube macroscopic film continuum to a roller covered with a flexible substrate, wherein the flexible substrate is an aluminum foil, and the diameter of the roller is 40 cm. The continuous body is kept on a roller under the tensile stress of 100MPa, and the base material needs to be wetted by a mixture of methanol and ethanol before the continuous body is adhered. After the stretched continuum is fully wrapped around the substrate, the substrate is placed in the chamber 100^oAnd C, baking for 1 hour in a baking oven, and tearing off a film formed by the continuous body covered on the substrate after baking to obtain the oriented and high-activity carbon nanotube macroscopic film, wherein the size of the film is equal to that of the substrate.

The preparation and assembly of the electrode, the carbon nano tube macroscopic film is adopted as the current collector of the positive and negative electrodes, the types, the loading capacity and the coating method of the active materials in the positive and negative electrodes and the diaphragm refer to patent ZL 201410702272.6. And after preparing the positive and negative electrode plates with double-sided material loading, assembling the whole battery by adopting the positive plate, the diaphragm and the negative plate. And assembling 1 positive and negative electrode plates of the whole electrode. The cell is packaged by referring to a packaging material and a packaging method in a patent ZL 201410702272.6.

The battery core absorbs the electrolyte. In a dehumidification room or a glove box with the humidity lower than 8%, injecting electrolyte into the outer package of the battery core which is not completely sealed, wherein the injection amount can be obtained according to the method: the injection weight (g) = the battery capacity (in mA h)/n, and n is 60; and (3) after liquid injection, placing the battery in a vacuum drying oven (the vacuum degree is lower than-100 Kpa), standing for 40 min under the vacuum condition, and sealing the unsealed side by using an edge sealing machine to complete the manufacture of the full battery.

In this example, the battery was cycled between 1.5 and 2.8 volts at 0.5 ℃ with a specific discharge capacity of 163, 161, 126, 118, 90, 31, 15 mA h g at 25, 0, -20, -25, -30, -35, -40 ℃^-1The coulombic efficiency of the battery in the whole process is close to 100%. The battery can be easily foldedWhen the battery is put in a vacuum environment or water, the electrochemical performance of the battery is hardly changed.

Example 3

The carbon nanotube macroscopic tube continuum is pre-stretched, and the preparation method of the carbon nanotube macroscopic tube continuum refers to patent ZL 201310013214.8. The carbon nano tube macroscopic tube continuum is pulled out of the reaction cavity through the mechanical rod, the mechanical rod is made of high-temperature-resistant steel, the motion of the mechanical rod is driven by the motor at a constant speed, the speed of the mechanical rod outside the reaction cavity is 9 m/min, the speed of the mechanical rod in the reaction cavity is 0.5 m/min, the tensile stress of the mechanical rod on the continuum is controlled to be 120MPa, and the stress time of the continuum is 5 seconds.

And (3) preparing a flexible carbon nanotube macroscopic film, namely adhering the stressed carbon nanotube macroscopic film continuum to a roller covered with a flexible substrate, wherein the flexible substrate is a copper foil, and the diameter of the roller is 20 cm. The continuous body is kept on a roller under the tensile stress of 120MPa, and the substrate material needs to be wetted by ethanol before the continuous body is adhered. After the stretched continuum is fully wrapped around the substrate, the substrate is placed in the chamber 100^oAnd C, baking for 2 hours in a baking oven, and tearing off a film formed by the continuous body covered on the substrate after baking to obtain the oriented and high-activity carbon nanotube macroscopic film, wherein the size of the film is equal to that of the substrate.

The preparation and assembly of the electrode, the carbon nano tube macroscopic film is adopted as the current collector of the positive and negative electrodes, the types, the loading capacity and the coating method of the active materials in the positive and negative electrodes and the diaphragm refer to patent ZL 201410702272.6. And after preparing the positive and negative electrode plates with double-sided material loading, assembling the whole battery in a lamination mode of the positive plate, the diaphragm, the negative plate, the diaphragm, the positive plate, the diaphragm and the negative plate. The positive and negative pole pieces of the whole electrode are assembled into 3 pieces. The cell is packaged by referring to a packaging material and a packaging method in a patent ZL 201410702272.6.

The battery core absorbs the electrolyte. In a dehumidification room or a glove box with the humidity lower than 8%, injecting electrolyte into the outer package of the battery core which is not completely sealed, wherein the injection amount can be obtained according to the method: filling weight (g) = battery capacity (in mA h)/n, wherein n is 50; and (3) after liquid injection, placing the battery in a vacuum drying oven (the vacuum degree is lower than-100 Kpa), standing for 30 min under the vacuum condition, and sealing the unsealed side by using an edge sealing machine to complete the manufacture of the full battery.

In this example, the fabricated battery was cycled between 1.5 and 2.8V at 0.5C, and the specific discharge capacity at 25, 0, -20, -25, -30, -35, -40 ℃ was 165, 161, 123, 116, 89, 31, 18 mA hr g^-1The coulombic efficiency of the battery in the whole process is close to 100%. The battery can be easily folded, and the electrochemical performance of the battery is hardly changed when the battery is put in a vacuum environment or water.

Example 4

The carbon nanotube macroscopic tube continuum is pre-stretched, and the preparation method of the carbon nanotube macroscopic tube continuum refers to patent ZL 201310013214.8. The carbon nano tube macroscopic tube continuum is pulled out of the reaction cavity through the mechanical rod, the mechanical rod is made of high-temperature-resistant steel, the motion of the mechanical rod is driven by the motor at a constant speed, the speed outside the reaction cavity is 10 m/min, the speed in the reaction cavity is 90MPa, and the stress time of the continuum is 3 seconds.

And (3) preparing a flexible carbon nanotube macroscopic film, namely adhering the stressed carbon nanotube macroscopic film continuum to a roller covered with a flexible substrate, wherein the flexible substrate is paper, and the diameter of the roller is 100 cm. The continuous body is kept on a roller under the tensile stress of 90MPa, and the base material needs to be wetted by a mixture of ethanol and water before the continuous body is adhered. After the stretched continuum is fully wound around the substrate, the substrate is placed in 110^oAnd C, baking for 1 hour in a baking oven, and tearing off a film formed by the continuous body covered on the substrate after baking to obtain the oriented and high-activity carbon nanotube macroscopic film, wherein the size of the film is equal to that of the substrate.

The battery core absorbs the electrolyte. In a dehumidification room or a glove box with the humidity lower than 8%, injecting electrolyte into the outer package of the battery core which is not completely sealed, wherein the injection amount can be obtained according to the method: filling weight (g) = battery capacity (in mA h)/n, wherein n is 50; and (3) after liquid injection, placing the battery in a vacuum drying oven (the vacuum degree is lower than-100 Kpa), standing for 40 min under the vacuum condition, and sealing the unsealed side by using an edge sealing machine to complete the manufacture of the full battery.

In this example, the battery was cycled between 1.5 and 2.8 volts at 0.5 ℃ with a specific discharge capacity of 162, 160, 123, 115, 87, 31, 15 mA h g at 25, 0, -20, -25, -30, -35, -40 ℃^-1The coulombic efficiency of the battery in the whole process is close to 100%. The battery can be easily folded, and the electrochemical performance of the battery is hardly changed when the battery is put in a vacuum environment or water.

Example 5

The carbon nanotube macroscopic tube continuum is pre-stretched, and the preparation method of the carbon nanotube macroscopic tube continuum refers to patent ZL 201310013214.8. The carbon nano tube macroscopic tube continuum is pulled out of the reaction cavity through the mechanical rod, the mechanical rod is made of high-temperature-resistant hard alloy, the motion of the mechanical rod is driven by the motor at a constant speed, the speed of the mechanical rod outside the reaction cavity is 7 m/min, the speed of the mechanical rod in the reaction cavity is 0.03 m/min, the tensile stress of the mechanical rod on the continuum is controlled to be 120MPa, and the stress time of the continuum is 5 seconds.

And (3) preparing a flexible carbon nanotube macroscopic film, namely adhering the stressed carbon nanotube macroscopic film continuum to a roller covered with a flexible substrate, wherein the flexible substrate is paper, and the diameter of the roller is 30 cm. The continuous body is kept on a roller under the tensile stress of 120MPa, and the base material needs to be wetted by a mixture of methanol and ethanol before the continuous body is adhered. After the stretched continuum is fully wrapped around the substrate, the substrate is placed in the chamber 100^oAnd C, baking for 2 hours in a baking oven, and tearing off a film formed by the continuous body covered on the substrate after baking to obtain the oriented and high-activity carbon nanotube macroscopic film, wherein the size of the film is equal to that of the substrate.

The battery core absorbs the electrolyte. In a dehumidification room or a glove box with the humidity lower than 8%, injecting electrolyte into the outer package of the battery core which is not completely sealed, wherein the injection amount can be obtained according to the method: the injection weight (g) = the battery capacity (in mA h)/n, wherein n is 100; and (3) after liquid injection, placing the battery in a vacuum drying oven (the vacuum degree is lower than-100 Kpa), standing for 20 min under the vacuum condition, and sealing the unsealed side by using an edge sealing machine to complete the manufacture of the full battery.

In this example, the fabricated battery was cycled between 1.5 and 2.8V at 0.5C, and the specific discharge capacity at 25, 0, -20, -25, -30, -35, -40 ℃ was 166, 163, 127, 116, 89, 32, 16 mA h g^-1The coulombic efficiency of the battery in the whole process is close to 100%. The battery can be easily folded, and the electrochemical performance of the battery is hardly changed when the battery is put in a vacuum environment or water.

Claims

1. A flexible lithium ion battery capable of working in all weather is characterized in that: the battery takes a membrane assembled by a stretched carbon nano tube macroscopic tube continuum as a positive and negative electrode current collector, and in the process of film formation, the membrane is subjected to porous treatment, so that electrolyte can be stored in the carbon nano tube macroscopic membrane serving as the current collector; the battery comprises a positive electrode plate, a diaphragm and a negative electrode plate which are sequentially stacked.

2. A flexible lithium ion battery that can operate around the clock as claimed in claim 1, wherein: the preparation method comprises the following steps:

firstly, pre-stretching a carbon nano tube macroscopic tube continuum: the carbon nano tube macroscopic tube continuum is pulled out of the reaction cavity through a mechanical rod, the mechanical rod is made of high-temperature resistant steel or hard alloy, the motion of the mechanical rod is driven by a motor at a constant speed, the speed of the mechanical rod outside the reaction cavity is 0.5-60 m/min, the speed of the mechanical rod in the reaction cavity is 0.01-0.5 m/min, the tensile stress of the mechanical rod on the continuum is controlled to be 40-120MPa, and the stress time of the continuum is 1-20 seconds;

step two, preparing a flexible carbon nanotube macroscopic film: adhering the stressed carbon nanotube macroscopic tube continuum to a roller covered with a flexible substrate, wherein the flexible substrate comprises paper, carbon cloth, a plastic film, a copper foil or an aluminum foil, and the diameter of the roller is 1-500 cm; continuously maintaining the continuous body on a roller under the tensile stress of 40-120MPa, and wetting the substrate material with methanol, ethanol, propanol, water or a mixture thereof before the continuous body is adhered; after the continuous body after tension stretching is wound fully on the substrate, the substrate is put in 60-150^oC, baking in an oven for 30 min-5 h, and after drying, tearing off a film formed by the continuous body covering the substrate to obtain a directional and high-activity carbon nanotube macroscopic film, wherein the size of the film is equal to that of the substrate;

step three, preparing and assembling electrodes: adopting the carbon nano tube macroscopic film in the step two as a current collector of a positive electrode and a negative electrode, and assembling the whole battery in a lamination mode of a positive plate, a diaphragm, a negative plate, a diaphragm, a positive plate, a diaphragm and a negative plate after preparing positive and negative electrode plates with double-sided material loading; the positive and negative pole pieces of the assembled full battery are selected from 1-10 pieces; packaging the battery cell;

step four, the battery core absorbs the electrolyte: in a dehumidification room or a glove box with the humidity lower than 8%, injecting electrolyte into the outer package of the battery core which is not completely sealed, wherein the injection amount can be obtained according to the method: the electrolyte injection weight g = battery capacity/n, wherein the battery capacity is in mA h, and n is selected from 50-150 according to actual conditions; and (3) after liquid injection, placing the battery in a vacuum drying oven with the vacuum degree lower than-100 Kpa for 20-40 min under the vacuum condition, and then sealing the unsealed side by using an edge sealing machine to complete the manufacture of the full battery.

3. A preparation method of a flexible lithium ion battery capable of working in all weather is characterized by comprising the following steps: the battery takes a membrane assembled by a stretched carbon nano tube macroscopic tube continuum as a positive and negative electrode current collector, and in the process of film formation, the membrane is subjected to porous treatment, so that electrolyte can be stored in the carbon nano tube macroscopic membrane serving as the current collector; the battery comprises a positive electrode plate, a diaphragm and a negative electrode plate which are sequentially stacked.

4. A method for preparing the flexible lithium ion battery capable of working all weather according to claim 3, which is characterized in that: the method comprises the following specific steps: