Miniature fully-sealed lithium-manganese battery liquid injection device

Abstract

The utility model relates to the technical field of battery manufacturing, and provides a miniature fully-sealed lithium-manganese battery liquid injection device which comprises a vacuum tank and a tank cover which are connected in a sealed mode, a liquid injection disc used for containing a miniature fully-sealed lithium-manganese battery is placed in the vacuum tank, and electrolyte for immersing the miniature fully-sealed lithium-manganese battery is arranged in the liquid injection disc. A funnel, a vacuum valve, a pressure release valve and a vacuum gauge which are communicated with an inner cavity of the vacuum tank are respectively mounted on the tank cover in a sealing manner, a liquid distribution valve is arranged on the funnel, electrolyte flows into the liquid injection disc through the funnel, and the vacuum valve is connected with a vacuum pump for vacuumizing. After the vacuum tank is vacuumized, electrolyte is injected through the funnel to immerse the miniature fully-sealed lithium-manganese battery, and after pressure relief, the electrolyte is pressed into the battery under the action of atmospheric positive pressure, so that electrolyte filling of the miniature fully-sealed lithium-manganese battery is realized, and the electrolyte filling efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, and more specifically, to a liquid injection device for a micro fully-sealed lithium manganese battery. Background Art

[0002] A micro fully-sealed lithium manganese battery is a battery with a very small diameter and volume, and is usually used in microelectronic devices such as swallowable endoscopic capsules. It uses lithium as the negative electrode and manganese dioxide as the positive electrode, has a small volume, good medium and high rate discharge performance, and good safety performance.

[0003] Currently, the existing liquid injection method for micro fully-sealed lithium manganese batteries is to use an electro-hydraulic perfusion machine for vacuum liquid injection. The operation process includes aligning the liquid injection head with the liquid injection hole of the battery, pressing and sealing the periphery of the liquid injection hole, then evacuating the air, and finally injecting the electrolyte. Since the micro fully-sealed lithium manganese battery has a very small external dimension and no large opening, it is impossible to directly drop the electrolyte. In addition, in order to achieve a fully-sealed structure, it is necessary to perform sealed welding. However, the manganese dioxide electrolyte is an organic electrolyte and is prone to catching fire and burning. Therefore, the micro fully-sealed lithium manganese battery generally adopts the method of vacuum liquid injection with an electro-hydraulic perfusion machine for electrolyte injection.

[0004] However, since the diameter of the micro fully-sealed lithium manganese battery is usually less than 10 mm, the battery liquid injection hole is only about 0.5 mm to 0.8 mm, while the size of a common perfusion head is about 5 mm. This makes it difficult to align and seal the perfusion head with the battery liquid injection hole, and often the battery liquid injection hole is blocked by the gasket, resulting in difficult liquid injection. In addition, the liquid injection weight is also uneven, and only one battery can be liquid-injected each time, resulting in low production efficiency. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a liquid injection device for a micro fully-sealed lithium manganese battery, to solve the above technical problems, and to improve the electrolyte perfusion efficiency.

[0006] An embodiment of the utility model is realized by the following technical solutions: A liquid injection device for a micro fully-sealed lithium manganese battery includes a vacuum tank and a tank cover that are hermetically connected. A liquid injection tray for placing the micro fully-sealed lithium manganese battery is placed in the vacuum tank. The liquid injection tray is provided with an electrolyte for submerging the micro fully-sealed lithium manganese battery. A funnel, a vacuum valve, a pressure relief valve, and a vacuum gauge that are hermetically installed and communicated with the inner cavity of the vacuum tank are respectively arranged on the tank cover. A liquid distribution valve is arranged on the funnel, and the electrolyte flows into the liquid injection tray through the funnel. The vacuum valve is connected to a vacuum pump for evacuating the air.

[0007] Further, one end of the micro fully-sealed lithium manganese battery with a liquid injection hole is placed upward in the liquid injection tray.

[0008] Further, a plurality of micro fully-sealed lithium manganese batteries are placed in the liquid injection tray.

[0009] Furthermore, both the vacuum chamber and the liquid injection tray are made of transparent glass material.

[0010] Furthermore, the bottom pipe orifice of the funnel leads directly to the center position at the bottom inside the liquid injection tray.

[0011] Furthermore, the tank cover is made of plastic material.

[0012] Furthermore, a sealing ring that is in sealing contact with the upper edge of the vacuum chamber is provided on the tank cover.

[0013] The utility model has at least the following advantages and beneficial effects: By placing the micro fully sealed lithium manganese battery in the liquid injection tray and putting the liquid injection tray into the vacuum chamber, after evacuating the vacuum chamber, the electrolyte is injected through the funnel to submerge the micro fully sealed lithium manganese battery. After pressure relief, the electrolyte is pressed into the battery interior under the action of atmospheric positive pressure, realizing the electrolyte perfusion of the micro fully sealed lithium manganese battery and effectively improving the electrolyte perfusion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 FIG. is a schematic structural diagram of a liquid injection device for a micro fully sealed lithium manganese battery provided by the present utility model;

[0016] Reference numerals: 1 - vacuum chamber, 2 - tank cover, 20 - sealing ring, 3 - liquid injection tray, 4 - micro fully sealed lithium manganese battery, 5 - electrolyte, 6 - funnel, 60 - liquid distribution valve, 7 - vacuum valve, 8 - pressure relief valve, 9 - vacuum gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0019] Embodiment

[0020] As Figure 1 shown, in this embodiment, a micro fully sealed lithium manganese battery liquid injection device is mainly disclosed, which has a simple structure and is easy to operate. It includes a vacuum tank 1 and a tank cover 2 that are hermetically connected. A liquid injection tray 3 for holding the micro fully sealed lithium manganese battery 4 is placed in the vacuum tank 1. An electrolyte 5 for submerging the micro fully sealed lithium manganese battery 4 is provided in the liquid injection tray 3. A funnel 6, a vacuum valve 7, a pressure relief valve 8, and a vacuum gauge 9 that are hermetically installed and communicate with the inner cavity of the vacuum tank 1 are respectively provided on the tank cover 2. A liquid distribution valve 60 is provided on the funnel 6, and the electrolyte 5 flows into the liquid injection tray 3 through the funnel 6. The vacuum valve 7 is connected to a vacuum pump for evacuating. Specifically, in a dry environment, the micro fully sealed lithium manganese battery 4 is placed in the liquid injection tray 3, and then the liquid injection tray 3 is placed into the vacuum tank 1. The tank cover 2 is covered. After confirming that the liquid distribution valve 60 and the pressure relief valve 8 are in the closed state, the vacuum valve 7 is opened to evacuate the inner cavity of the vacuum tank 1. Under the action of negative pressure, the tank cover 2 tightly adheres and adsorbs on the vacuum tank 1, making the inner cavity of the vacuum tank 1 initially form a vacuum state. Then, manganese dioxide electrolyte 5 is added into the funnel 6. When the vacuum gauge 9 detects that the vacuum degree is lower than -0.08 Mpa, the vacuum valve 7 is closed, and the liquid distribution valve 60 is opened to allow the electrolyte 5 to flow into the liquid injection tray 3. At the same time, due to the action of air pressure, the flow rate of the electrolyte 5 becomes faster. Until the electrolyte 5 submerges the micro fully sealed lithium manganese battery 4, the liquid distribution valve 60 is closed. At this time, there is still electrolyte 5 above the funnel 6, and the air pressure in the inner cavity of the vacuum tank 1 will not relieve pressure from the funnel 6. Then the pressure relief valve 8 is opened. After pressure relief, under the action of atmospheric positive pressure, the electrolyte 5 is quickly pressed into the micro fully sealed lithium manganese battery 4. After waiting for the specified time, the tank cover 2 is removed, the liquid injection tray 3 is taken out, the excess electrolyte 5 is separated, and the micro fully sealed lithium manganese battery 4 is taken out for hole plugging and sealing, thus completing the perfusion of the electrolyte 5 for the micro fully sealed lithium manganese battery 4. The liquid injection speed is fast, effectively improving the perfusion efficiency of the electrolyte 5. It should be noted that the diameter of the tank cover 2 should be larger than the opening diameter of the vacuum tank 1 to ensure that it can completely cover the opening of the vacuum tank 1. In addition, by reducing the vacuum degree in the inner cavity of the vacuum tank 1, the perfusion amount of the electrolyte 5 can be reduced, and the controllability of the injection amount of the electrolyte 5 can be realized to a certain extent. Furthermore, multiple liquid injection trays 3 can be provided. One is placed in the vacuum tank 1, and the others are used to place the micro fully sealed lithium manganese battery 4 outside first. In a one-for-one standby mode, they are used alternately to further improve the working efficiency.

[0021] Further, in specific implementation, the above-mentioned micro fully-sealed lithium manganese battery 4 provided in the embodiment of the present utility model is placed with the end having the liquid injection hole facing upward in the liquid injection tray 3. It should be noted that the liquid injection hole for injecting the electrolyte 5 is usually provided on the end cap led out from the positive electrode. Placing the end of the micro fully-sealed lithium manganese battery 4 with the liquid injection hole facing upward facilitates the atmospheric positive pressure to press the electrolyte 5 into the battery interior, ensuring the uniformity and stability of the liquid injection volume.

[0022] Further, in specific implementation, several micro fully-sealed lithium manganese batteries 4 are placed in the above-mentioned liquid injection tray 3 provided in the embodiment of the present utility model. This liquid injection device can simultaneously perform the liquid injection operation on several micro fully-sealed lithium manganese batteries 4. The air pressures received by the several micro fully-sealed lithium manganese batteries 4 in the liquid injection tray 3 are the same, which can ensure the uniformity of their liquid injection volumes and further improve the operation efficiency.

[0023] Further, in specific implementation, both the above-mentioned vacuum tank 1 and the liquid injection tray 3 provided in the embodiment of the present utility model are made of transparent glass material, which is convenient for visually checking from the outside whether the electrolyte 5 has completely submerged the battery, and then performing the closing operation of the liquid separation valve 60. Specifically, the diameter of the vacuum tank 1 can be 200 - 500 mm, the depth can be 150 - 200 mm, and the thickness can be 5 - 20 mm. And the diameter of the liquid injection tray 3 can be 20 - 50 mm smaller than the diameter of the vacuum tank 1.

[0024] Further, in specific implementation, the bottom end of the pipe of the above-mentioned funnel 6 directly leads to the center position at the bottom inside the liquid injection tray 3, ensuring the smooth flow of the electrolyte 5 into the liquid injection tray 3 and reducing the situation of the electrolyte 5 splashing outside.

[0025] Further, in specific implementation, the above-mentioned tank cover 2 is made of plastic material. Specifically, it can be a plastic circular plate with a thickness of 20 - 30 mm, and its diameter can be 30 - 50 mm larger than the diameter of the vacuum tank 1.

[0026] Further, in specific implementation, a sealing ring 20 that is in sealing contact with the upper edge of the vacuum tank 1 is provided on the above-mentioned tank cover 2. On the one hand, it plays a sealing role, and on the other hand, it plays a role of buffer contact between the vacuum tank 1 and the tank cover 2.

[0027] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A miniature fully sealed lithium manganese battery injection device, characterized in that: The invention comprises a vacuum tank (1) and a tank cover (2) which are sealed and connected. A liquid injection tray (3) for containing a miniature fully sealed lithium manganese battery (4) is placed in the vacuum tank (1). The liquid injection tray (3) is provided with an electrolyte (5) for immersing the miniature fully sealed lithium manganese battery (4). A funnel (6) which is connected to the inner cavity of the vacuum tank (1), a vacuum valve (7), a pressure relief valve (8) and a vacuum gauge (9) are respectively and sealedly mounted on the tank cover (2). A liquid separation valve (60) is provided on the funnel (6). The electrolyte (5) flows into the liquid injection tray (3) through the funnel (6). The vacuum valve (7) is connected to a vacuum pump for evacuating the vacuum.

2. A miniature fully sealed lithium manganese battery injection device as claimed in claim 1, characterized in that: The miniature fully sealed lithium manganese battery (4) is provided with a liquid injection hole and is placed in the liquid injection tray (3) with one end facing upward.

3. A miniature fully sealed lithium manganese battery injection device as claimed in claim 1, characterized in that: A plurality of the miniature fully sealed lithium manganese batteries (4) are placed in the liquid injection tray (3).

4. A miniature fully sealed lithium manganese battery injection device as claimed in claim 1, characterized in that: The vacuum tank (1) and the liquid injection tray (3) are both made of transparent glass.

5. A miniature fully sealed lithium manganese battery injection device as claimed in claim 1, characterized in that: The bottom pipe opening of the funnel (6) is directly connected to the center position of the bottom end of the liquid injection tray (3).

6. A miniature fully sealed lithium manganese battery injection device as claimed in claim 1, characterized in that: The slot cover (2) is made of plastic material.

7. A miniature fully sealed lithium manganese battery injection device as claimed in claim 1, characterized in that: The tank cover (2) is provided with a sealing ring (20) which is in sealing contact with the upper edge of the vacuum tank (1).

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