阅读说明：本技术 一种二次电池及其制备方法 (Secondary battery and preparation method thereof ) 是由 赖秉豊 于 2019-09-24 设计创作，主要内容包括：本发明涉及电池制备领域,提供了一种二次电池及其制备方法,包括以下步骤：S1,将正极活性物质以负极活性物质分别涂布到集流体上,并烘干溶剂形成正极预制极片以及负极预制极片；S2,将所述正极预制极片以及所述负极预制极片冲切形成预定行状,形成正极极片以及负极极片；S3,将所述正极极片、隔膜以及所述负极极片装配到一起,然后贴胶形成极芯；S4,极芯装入已经冲好坑的铝塑膜,并完成顶封、侧封,形成未注液的电池包；S5,将指定量的电解液注入所述电池包的内部；S6,将所述电池包置入复合材料组成的电池壳体,将气体抽出,并继续抽真空,使所述电池包内形成负压,最后封装。本发明将电解液处于负压的状态下,使锂离子电解液更容易将锂等离子化,提供更快速的电化学反应。(The invention relates to the field of battery preparation, and provides a secondary battery and a preparation method thereof, wherein the preparation method comprises the following steps: s1, respectively coating the positive active material and the negative active material on a current collector, and drying the solvent to form a positive prefabricated pole piece and a negative prefabricated pole piece; s2, punching the prefabricated positive pole piece and the prefabricated negative pole piece to form a preset row shape, and forming a positive pole piece and a negative pole piece; s3, assembling the positive pole piece, the diaphragm and the negative pole piece together, and then rubberizing to form a pole core; s4, filling the pole core into the aluminum-plastic film with the punched pits, and finishing top sealing and side sealing to form a battery pack without liquid injection; s5, injecting a predetermined amount of electrolyte into the battery pack; and S6, placing the battery pack into a battery shell made of composite materials, extracting gas, continuously vacuumizing to form negative pressure in the battery pack, and finally packaging. The invention makes lithium ion electrolyte easier to plasmize lithium and provides faster electrochemical reaction under the condition that the electrolyte is in a negative pressure state.)

1. A method for manufacturing a secondary battery, comprising the steps of:

s1, respectively coating the positive active material and the negative active material on a current collector, and drying the solvent to form a positive prefabricated pole piece and a negative prefabricated pole piece;

s2, punching the prefabricated positive pole piece and the prefabricated negative pole piece to form a preset row shape, and forming a positive pole piece and a negative pole piece;

s3, assembling the positive pole piece, the diaphragm and the negative pole piece together, and then rubberizing to form a pole core;

s4, filling the pole core into the aluminum-plastic film with the punched pits, and finishing top sealing and side sealing to form a battery pack without liquid injection;

s5, injecting a predetermined amount of electrolyte into the battery pack;

and S6, placing the battery pack into a battery shell made of composite materials, extracting gas, continuously vacuumizing to form negative pressure in the battery pack, and finally packaging.

2. The method according to claim 2, wherein the negative pressure value is 100 to 2000 Pa.

3. A secondary battery comprising: the battery comprises a battery shell, and a positive electrode, a negative electrode, a diaphragm and electrolyte which are contained in the battery shell, and is characterized in that the battery shell is in a negative pressure state.

4. The battery according to claim 3, wherein the negative pressure value is 100 to 2000 Pa.

Technical Field

The invention relates to the field of battery preparation, in particular to a preparation method of a secondary battery.

Background

A secondary battery is also called a rechargeable battery or a secondary battery, and refers to a battery that can be continuously used by activating an active material by charging after the battery is discharged.

At present, secondary batteries in the existing market have the problems of high lithium plasma conversion difficulty and low efficiency of converting chemical energy into electric energy.

Disclosure of Invention

The present invention provides a secondary battery and a method for manufacturing the same, which can effectively solve the above problems.

The invention is realized by the following steps:

a method for manufacturing a secondary battery, comprising the steps of:

s1, respectively coating the positive active material and the negative active material on a current collector, and drying the solvent to form a positive prefabricated pole piece and a negative prefabricated pole piece;

s2, punching the prefabricated positive pole piece and the prefabricated negative pole piece to form a preset row shape, and forming a positive pole piece and a negative pole piece;

s3, assembling the positive pole piece, the diaphragm and the negative pole piece together, and then rubberizing to form a pole core;

s4, filling the pole core into the aluminum-plastic film with the punched pits, and finishing top sealing and side sealing to form a battery pack without liquid injection;

s5, injecting a predetermined amount of electrolyte into the battery pack;

and S6, placing the battery pack into a battery shell made of composite materials, extracting gas, continuously vacuumizing to form negative pressure in the battery pack, and finally packaging.

A secondary battery comprising: the battery comprises a battery shell, and a positive electrode, a negative electrode, a diaphragm and electrolyte which are contained in the battery shell, wherein the battery shell is in a negative pressure state.

As a further improvement, the negative pressure value is 100 Pa-2000 Pa.

The invention has the beneficial effects that: the invention makes lithium ion electrolyte easier to plasmize lithium and provides faster electrochemical reaction under the condition that the electrolyte is in a negative pressure state.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of the steps of a preparation method provided by the embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1, a method for manufacturing a secondary battery includes the steps of:

s1, respectively coating the positive active material and the negative active material on a current collector, and drying the solvent to form a positive prefabricated pole piece and a negative prefabricated pole piece;

s2, punching the prefabricated positive pole piece and the prefabricated negative pole piece to form a preset row shape, and forming a positive pole piece and a negative pole piece;

s3, assembling the positive pole piece, the diaphragm and the negative pole piece together, and then rubberizing to form a pole core;

s4, filling the pole core into the aluminum-plastic film with the punched pits, and finishing top sealing and side sealing to form a battery pack without liquid injection;

s5, injecting a predetermined amount of electrolyte into the battery pack;

and S6, placing the battery pack into a battery shell made of composite materials, extracting gas, continuously vacuumizing to form negative pressure in the battery pack, and finally packaging.

A secondary battery comprising: the battery comprises a battery shell, and a positive electrode, a negative electrode, a diaphragm and electrolyte which are contained in the battery shell, wherein the battery shell is in a negative pressure state. Preferably, the negative pressure value is 100Pa to 2000Pa, and in this embodiment, the negative pressure value is 1200 Pa.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.