High-temperature negative-pressure formation device for square aluminum shell lithium ion battery

Abstract

The invention relates to a square aluminum shell lithium ion battery high-temperature negative-pressure formation device which comprises a charging barrel, the lower end of the charging barrel is provided with a first liquid injection pipeline for conveying electrolyte into a battery cell, and one side of the charging barrel is connected with a recycling assembly for recycling the electrolyte containing bubbles. A switching assembly for switching pipelines is arranged between the recycling assembly and the first liquid injection pipeline, a second liquid injection pipeline is arranged in the first liquid injection pipeline, a pressurizing assembly for pressurizing the second liquid injection pipeline is arranged in the charging barrel, and when the first liquid injection pipeline is about to be filled with electrolyte, the pipelines are switched through the switching assembly, so that the second liquid injection pipeline is filled with the electrolyte. The pressurizing assembly drives the second liquid injection pipeline to input the electrolyte, so that the electrolyte in the battery cell flows, the electrolyte containing bubbles flows to the upper layer of the battery cell, the recycling assembly recycles the electrolyte containing bubbles on the upper layer, and the formation speed of the lithium battery is increased.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery production technology, specifically to a high-temperature negative pressure formation device for square aluminum-cased lithium-ion batteries. Background Technology

[0002] During the formation process of lithium-ion batteries, the reaction that generates the SEI film and other side reactions will produce inorganic gases. The gas production is not only generated during the first charge and discharge process, but will continue to be generated in subsequent cycles. As the number of cycles increases, the amount of gas produced gradually decreases.

[0003] A Chinese invention application with publication number CN114430071A discloses a lithium-ion battery formation device and process with venting and electrolyte replenishment capabilities. The device involves setting pressure and temperature to form the battery cell in a base. After formation, the vent valve is closed, the cover is pressed down to the first position, and some electrolyte in the battery cell overflows into the second pipe through the first pipe without overflowing, with a settling time t1. The vent valve located in the vent hole is removed, and the electrolyte replenishment mechanism's injection pipe enters the working chamber through the vent hole and connects to the upper end of the second pipe. The electrolyte replenishment mechanism then injects electrolyte into the battery cell.

[0004] However, the inventors discovered that in the above-mentioned device, some of the electrolyte inside the battery cell is squeezed out into the pipe and left to stand for a period of time to allow the air bubbles in the electrolyte to dissipate. In the process of mass production, the use of this device results in a significant waste of time. Based on this, we propose a high-temperature negative pressure formation device for square aluminum-cased lithium-ion batteries. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a first injection pipe at the lower end of the barrel to deliver electrolyte into the battery cell. A recovery component for recovering electrolyte containing air bubbles is connected to one side of the barrel. A switching component for switching the pipeline is provided between the recovery component and the first injection pipe. A second injection pipe is provided inside the first injection pipe. A pressurizing component for pressurizing the second injection pipe is provided inside the barrel. When the first injection pipe is about to be filled with electrolyte, the switching component switches the pipeline, and the pressurizing component drives the second injection pipe to input electrolyte, causing the electrolyte in the battery cell to flow. This allows the electrolyte containing air bubbles to flow to the upper layer of the battery cell, and the recovery component recovers the upper layer of electrolyte containing air bubbles, thereby accelerating the formation speed of lithium batteries.

[0006] To address the aforementioned technical problems, the present invention adopts the following technical solution:

[0007] A high-temperature negative pressure formation device for a square aluminum-cased lithium-ion battery includes a barrel. A first injection pipe for delivering electrolyte to the inside of the battery cell is located at the lower end of the barrel. A recovery component for recovering electrolyte containing air bubbles is connected to one side of the barrel. A switching component for switching the pipeline is located between the recovery component and the first injection pipe. A pipe is located at the lower end of the switching component. A second injection pipe is located inside the first injection pipe. A pressurizing component for pressurizing the second injection pipe is located inside the barrel. When the electrolyte is about to be filled, the pipeline is switched by the switching component. While the pressurizing component drives the second injection pipe to input electrolyte, the recovery component recovers the upper layer of electrolyte containing air bubbles.

[0008] As a preferred embodiment, the recycling assembly includes a recycling pipe disposed on the side of the barrel and a liquid pump disposed on the recycling pipe.

[0009] As a preferred embodiment, the switching assembly includes a valve body, a first ball rotatably disposed within the valve body, a second ball disposed within the first ball, and a rotary valve disposed on the first ball.

[0010] As a preferred embodiment, the second sphere is connected to the second injection pipe, and the first sphere has an arc-shaped groove for sliding of the second injection pipe, the arc-shaped groove being connected to the inlet on the first sphere.

[0011] As a preferred embodiment, the pressurizing assembly includes a pressurizing chamber disposed within the material cylinder, a piston plate disposed within the pressurizing chamber, an annular plunger disposed at the lower end of the pressurizing chamber, a telescopic rod disposed between the annular plunger and the piston plate, and a spring disposed inside the telescopic rod.

[0012] As a preferred embodiment, the lower end of the pressurized chamber is provided with a liquid inlet pipe, and a one-way valve is provided on the liquid inlet pipe.

[0013] As a preferred embodiment, the distance by which the second injection pipe extends into the battery cell is greater than the distance by which the pipe extends into the battery cell.

[0014] As a preferred embodiment, a fixing block is provided at the upper end of the inner wall of the first injection pipe.

[0015] As another preferred embodiment, the fixing block is provided with a magnet, the lower end face of the annular plunger is provided with an iron sheet, and the outer side of the annular plunger is provided with a ring of rubber.

[0016] The beneficial effects of this invention are:

[0017] In this invention, a switching component is provided between the recycling component and the first injection pipe to switch the pipeline. When the electrolyte is about to be filled, the switching component switches the pipeline, and the pressurization component drives the second injection pipe to input electrolyte, causing the electrolyte in the cell to flow. This causes the electrolyte containing air bubbles to flow to the upper layer of the cell, and the recycling component recovers the upper layer electrolyte containing air bubbles, thereby accelerating the formation speed of the lithium battery.

[0018] In summary, this equipment has advantages such as high production efficiency and fast formation speed, and is especially suitable for the field of lithium-ion battery production technology. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the isometric structure of a high-temperature negative pressure formation device for a square aluminum-cased lithium-ion battery.

[0021] Figure 2 This is a schematic cross-sectional view of a high-temperature negative pressure formation device for a square aluminum-cased lithium-ion battery.

[0022] Figure 3 for Figure 2 Enlarged structural diagram of section A;

[0023] Figure 4 This is a schematic diagram of the liquid inlet pipe.

[0024] Figure 5 This is a structural diagram of the switching component;

[0025] Figure 6 This is a schematic diagram of the structure of the first sphere;

[0026] Figure 7 This is a schematic diagram of the arc-shaped groove.

[0027] In the diagram: 1-Cylinder; 2-Battery cell; 3-First injection pipe; 4-Recovery assembly; 5-Switching assembly; 6-Pipeline; 7-Second injection pipe; 8-Pressure assembly; 31-Fixing block; 41-Recovery pipe; 42-Liquid pump; 51-Valve body; 52-First ball; 53-Second ball; 54-Rotary valve; 55-Arc groove; 81-Pressure chamber; 82-Piston plate; 83-Annular plunger; 84-Telescopic rod; 85-Spring; 86-Inlet pipe; 87-Check valve. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0029] Example 1

[0030] like Figures 1 to 7 As shown, a high-temperature negative pressure formation device for a square aluminum-cased lithium-ion battery includes a barrel 1. The lower end of the barrel 1 is provided with a first injection pipe 3 for conveying electrolyte to the inside of the cell 2. A recovery component 4 for recovering electrolyte containing air bubbles is connected to one side of the barrel 1. A switching component 5 for switching the pipeline is provided between the recovery component 4 and the first injection pipe 3. A pipe 6 is provided at the lower end of the switching component 5. A second injection pipe 7 is provided inside the first injection pipe 3. A pressurizing component 8 for pressurizing the second injection pipe 7 is provided inside the barrel 1. When the electrolyte is about to be filled, the pipeline is switched by the switching component 5. At the same time, the pressurizing component 8 drives the second injection pipe 7 to input electrolyte, and the recovery component 4 recovers the upper layer of electrolyte containing air bubbles.

[0031] It is worth mentioning here that, as Figure 2 As shown, the recycling assembly 4 includes a recycling pipe 41 disposed on the side of the material cylinder 1 and a liquid pump 42 disposed on the recycling pipe 41.

[0032] In this embodiment, as Figures 5 to 7 As shown, the switching assembly 5 includes a valve body 51, a first ball 52 rotatably disposed within the valve body 51, a second ball 53 disposed within the first ball 52, and a rotary valve 54 disposed on the first ball 52. The second ball 53 is connected to the second injection pipe 7. The first ball 52 has an arc-shaped groove 55 for sliding of the second injection pipe 7. The arc-shaped groove 55 is connected to the inlet on the first ball 52. In this invention, the electrolyte in the first injection pipe 3 flows into the pipe 6 through the gap between the first ball 52 and the second ball 53, and then flows into the battery cell 2. When the rotary valve 54 switches, the electrolyte in the first injection pipe 7 flows into the battery cell 2 through the opening of the arc-shaped groove 55.

[0033] Furthermore, such as Figures 2 to 4As shown, the pressurizing assembly 8 includes a pressurizing chamber 81 disposed in the material cylinder 1, a piston plate 82 disposed in the pressurizing chamber 81, an annular plunger 83 disposed at the lower end of the pressurizing chamber 81, a telescopic rod 84 disposed between the annular plunger 83 and the piston plate 82, and a spring 85 disposed inside the telescopic rod 84; the lower end of the pressurizing chamber 81 is provided with a liquid inlet pipe 86, and a one-way valve 87 is provided on the liquid inlet pipe 86. In this invention, when the annular plunger 83 blocks the first liquid injection pipe 3, the electrolyte in the first liquid injection pipe 3 is not circulated, and a hydraulic cylinder can be connected to the piston plate 82 to generate power. A one-way valve is also provided in the second liquid injection pipe 7 to prevent the electrolyte in the second liquid injection pipe 7 from being drawn when the piston plate 82 moves upward.

[0034] In this embodiment, as Figures 6 to 7 As shown, the second liquid injection pipe 7 extends into the battery cell by a greater distance than the pipe 6 extends into the battery cell. In this invention, the second liquid injection pipe 7 is inserted deeper than the first liquid injection pipe 3, which causes the electrolyte in the battery cell 2 to flow, and the electrolyte containing air bubbles can float to the top more quickly for recycling.

[0035] It needs to be emphasized that, such as Figures 6 to 7 As shown, a fixing block 31 is provided at the upper end of the inner wall of the first injection pipe 3; a magnet is provided on the fixing block 31, an iron sheet is provided on the lower end face of the annular plunger 83, and a ring of rubber is provided on the outer side of the annular plunger 83. In this invention, the mutual attraction between the iron sheet and the magnet, and the ring of rubber on the outer side of the annular plunger 83, increases the sealing of the first injection pipe 3 and prevents electrolyte leakage.

[0036] The work process is as follows:

[0037] Manually insert pipe 6 into the electrolyte inlet of cell 2 and inject electrolyte through the first electrolyte inlet pipe 3. When the electrolyte inside cell 2 is about to be filled, manually rotate the rotary valve 54 to connect the recovery pipe 42 to pipe 6.

[0038] The piston plate 82 presses down, causing the annular plunger 83 to block the first injection pipe 3. At the same time as the piston plate 82 presses down, it squeezes the electrolyte in the pressurization chamber 81 to flow into the battery cell 2 through the second injection pipe 7. When the piston plate 82 rises, the inlet pipe 86 draws the electrolyte in the material cylinder 1 into the pressurization chamber 81.

[0039] At the same time, the liquid pump 42 is started, and the electrolyte in the upper layer inside the battery cell 2 returns to the material cylinder 1 through the recovery pipe 41 to stand.

[0040] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0041] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery, comprising a material cylinder (1), characterized in that: The lower end of the barrel (1) is provided with a first liquid injection pipe (3) for conveying electrolyte to the inside of the cell (2). A recovery component (4) for recovering electrolyte containing air bubbles is connected to one side of the barrel (1). A switching component (5) for switching the pipeline is provided between the recovery component (4) and the first liquid injection pipe (3). A pipe (6) is provided at the lower end of the switching component (5). A second liquid injection pipe (7) is provided inside the first liquid injection pipe (3). A pressurizing component (8) for pressurizing the second liquid injection pipe (7) is provided inside the barrel (1). When the electrolyte is about to be filled, the pipeline is switched by the switching component (5). At the same time, the pressurizing component (8) drives the second liquid injection pipe (7) to input electrolyte, and the recovery component (4) recovers the upper layer of electrolyte containing air bubbles.

2. The high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery according to claim 1, characterized in that, The recycling assembly (4) includes a recycling pipe (41) disposed on the side of the barrel (1) and a liquid pump (42) disposed on the recycling pipe (41).

3. The high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery according to claim 1, characterized in that, The switching assembly (5) includes a valve body (51), a first ball (52) rotatably disposed within the valve body (51), a second ball (53) disposed within the first ball (52), and a rotary valve (54) disposed on the first ball (52).

4. The high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery according to claim 3, characterized in that, The second sphere (53) is connected to the second injection pipe (7), and the first sphere (52) has an arc groove (55) for sliding of the second injection pipe (7), and the arc groove (55) is connected to the inlet on the first sphere (52).

5. The high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery according to claim 1, characterized in that, The pressurizing assembly (8) includes a pressurizing chamber (81) disposed in the barrel (1), a piston plate (82) disposed in the pressurizing chamber (81), an annular plunger (83) disposed at the lower end of the pressurizing chamber (81), a telescopic rod (84) disposed between the annular plunger (83) and the piston plate (82), and a spring (85) disposed inside the telescopic rod (84).

6. The high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery according to claim 5, characterized in that, The lower end of the pressurized chamber (81) is provided with an inlet pipe (86), and a one-way valve (87) is provided on the inlet pipe (86).

7. The high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery according to claim 1, characterized in that, The distance that the second injection pipe (7) extends into the battery cell is greater than the distance that the pipe (6) extends into the battery cell.

8. The high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery according to claim 1, characterized in that, A fixing block (31) is provided at the upper end of the inner wall of the first injection pipe (3).

9. A high-temperature negative pressure formation apparatus for a square aluminum-cased lithium-ion battery according to claim 8, characterized in that, A magnet is provided on the fixing block (31), an iron sheet is provided on the lower end face of the annular plunger (83), and a ring of rubber is provided on the outer side of the annular plunger (83).

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