Lithium ion cylindrical battery adopting liquid injection needle type liquid injection

Abstract

The utility model belongs to the technical field of lithium ion batteries, in particular relates to a cylindrical lithium ion battery adopting liquid injection needle type liquid injection, and provides the following scheme aiming at the problems of non-uniform electrolyte distribution and poor wettability and influence on the performance of the battery in the liquid injection mode of the traditional lithium ion battery in the prior art. The device comprises a pole piece and two needle cylinders, the piston is arranged in the needle cylinder, the top of the piston extends out of the needle cylinder, the top of the pole piece is provided with a positive tab area, and the bottom of the pole piece is provided with a negative tab area. The electrolyte is more uniformly distributed in the battery cell, the production period of the lithium ion battery can be shortened, the production cost can be reduced, the energy density and the cycle life of the battery can be improved, and the requirements of high-performance applications such as an electric automobile and the like can be met.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to a cylindrical lithium-ion battery with a liquid injection needle. Background Technology

[0002] In existing technologies, lithium-ion batteries are widely used in energy storage and power applications due to their advantages such as high energy density, long cycle life, safety, and environmental friendliness. With the expansion of applications and the increasing maturity of lithium-ion battery technology, higher demands are being placed on the performance of lithium-ion batteries, especially for electric vehicle batteries, which require higher energy density to improve the driving range of electric vehicles. However, the increased energy density of lithium-ion batteries leads to increased density of internal materials, resulting in slow electrolyte absorption and insufficient absorption, severely affecting the battery's electrical performance and production efficiency. Traditional lithium-ion battery electrolyte filling methods often suffer from uneven electrolyte distribution and poor wettability, impacting battery performance.

[0003] Therefore, this application proposes a liquid-filled needle-type cylindrical lithium-ion battery to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of traditional lithium-ion battery electrolyte injection methods, which often suffer from uneven electrolyte distribution and poor wettability, thus affecting battery performance. The invention proposes a lithium-ion cylindrical battery with a syringe-type electrolyte injection system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A lithium-ion cylindrical battery with liquid injection via a syringe, comprising an electrode and two syringes;

[0007] A piston, wherein the piston is disposed inside the syringe and the top of the piston extends outside the syringe.

[0008] As a preferred embodiment of this utility model, the top of the electrode is provided with a positive electrode tab area, and the bottom of the electrode is provided with a negative electrode tab area.

[0009] As a preferred embodiment of this utility model, needles are fixedly connected to the bottom of both syringes.

[0010] In a preferred embodiment of this invention, the syringe contains an electrolyte.

[0011] As a preferred embodiment of this utility model, the outer wall of the syringe is provided with graduations.

[0012] As a preferred embodiment of this utility model, the outer wall of the electrode is provided with a steel shell. Beneficial effects

[0013] 1. Vacuum treatment: The lithium-ion battery cell is placed in a vacuum system for vacuum treatment to ensure that the inside of the cell is within a certain vacuum range, which provides favorable conditions for subsequent electrolyte injection.

[0014] 2. Needle insertion into the core: Using a special injection needle, the movement of the needle is precisely controlled by a lifting drive mechanism so that it can be inserted into the core of the lithium-ion battery. This step is the key to achieving precise injection.

[0015] 3. Electrolyte injection: After the needle is inserted into the core, the electrolyte is injected into the core at a certain speed and volume through the injection needle.

[0016] 4. Subsequent processing: After the electrolyte injection is completed, the needle is pulled out of the cell, and the cell is pressurized and allowed to stand for a period of time to ensure that the electrolyte is evenly distributed in the cell.

[0017] In this utility model: This application can directly inject electrolyte into the core of the battery cell, which improves the wettability and injection efficiency of the electrolyte, makes the electrolyte distribution in the battery cell more uniform, shortens the production cycle of lithium-ion batteries, reduces production costs, and improves the energy density and cycle life of the battery, meeting the needs of high-performance applications such as electric vehicles. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the injection needle of this utility model;

[0019] Figure 2 This is a schematic diagram of the traditional cup-type liquid injection method of this utility model.

[0020] In the diagram: 1. Piston; 2. Syringe; 3. Needle; 4. Steel shell; 5. Electrolyte; 6. Positive tab area; 7. Electrode; 8. Negative tab area. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0022] Reference Figures 1-2 A lithium-ion cylindrical battery with liquid injection via a syringe, comprising an electrode 7 and two syringes 2;

[0023] Piston 1 is disposed inside syringe 2, and the top of piston 1 extends outside syringe 2.

[0024] As a preferred embodiment of this utility model, the top of the electrode 7 is provided with a positive electrode tab region 6, and the bottom of the electrode 7 is provided with a negative electrode tab region 8.

[0025] As a preferred embodiment of this utility model, needles 3 are fixedly connected to the bottom of both syringes 2.

[0026] As a preferred embodiment of this utility model, the syringe 2 is provided with electrolyte 5.

[0027] As a preferred embodiment of this utility model, the outer wall of the syringe 2 is provided with a scale.

[0028] As a preferred embodiment of this utility model, the outer wall of the electrode 7 is provided with a steel shell 4. Example

[0029] During the electrolyte injection process, the lifting drive mechanism and the injection needle are precisely controlled by the control unit to achieve more accurate electrolyte injection. At the same time, after the electrolyte injection is completed, the battery cell undergoes multiple vacuuming-pressurization-static cycle treatments to further improve the wettability and uniformity of electrolyte 5 in the battery cell.

[0030] The working principle of this utility model is as follows: A lithium-ion battery cell is placed in a vacuum system to create a vacuum and maintain this vacuum for a period of time to ensure that the inside of the cell is in a vacuum state so that the electrolyte 5 can be injected subsequently. An injection device is used, which includes an injection needle and a lifting drive mechanism. One end of the injection needle is driven by the lifting drive mechanism to move along the height direction of the lithium-ion battery cell until the needle tip 3 penetrates the tab area inside the cell core. After the needle tip 3 penetrates the cell core, the electrolyte 5 is injected into the cell through the injection needle. After the injection is completed, the needle tip 3 is pulled out of the cell, and the cell is then subjected to subsequent processing, such as pressurization and settling, to ensure that the electrolyte 5 is evenly distributed inside the cell.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lithium ion cylindrical battery of a liquid injection needle type, characterized by, include Electrode (7) and two syringes (2); A piston (1) is disposed inside a syringe (2), and the top of the piston (1) extends outside the syringe (2).

2. A lithium-ion cylindrical battery with injection needle type liquid filling according to claim 1, characterized in that, The top of the electrode (7) is provided with a positive electrode tab area (6), and the bottom of the electrode (7) is provided with a negative electrode tab area (8).

3. A lithium-ion cylindrical battery with injection needle type liquid filling according to claim 1, characterized in that, The bottom of both syringes (2) is fixedly connected with needles (3).

4. A lithium-ion cylindrical battery with injection needle type according to claim 1, characterized in that, The syringe (2) contains an electrolyte (5).

5. The lithium-ion cylindrical battery of claim 1, wherein the injection needle is formed of a conductive material. The outer wall of the syringe (2) is marked with graduations.

6. The lithium-ion cylindrical battery of claim 1, wherein the injection needle is formed of a conductive material. The outer wall of the electrode (7) is provided with a steel shell (4).

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