Battery cell negative pressure infiltration auxiliary equipment and battery cell

Abstract

The utility model provides battery cell negative pressure infiltration auxiliary equipment and a battery cell, the battery cell negative pressure infiltration auxiliary equipment comprises a sealing suction nozzle, a plastic nail is fixed in a cavity of the sealing suction nozzle, and the sealing suction nozzle is provided with a negative pressure pumping pipeline connected with air pumping equipment; the rubber nail comprises a nail head and a lower nail body connected to the lower end of the nail head, and the upper end face of the nail head is exposed out of the sealing suction nozzle; the servo motor set is provided with a negative pressure cavity, a push rod is arranged in the negative pressure cavity, and the first end of the push rod is connected with the servo motor set; the negative pressure cavity is used for adsorbing the upper end surface of the nail head under negative pressure; and the plastic nail is pressed down by the push rod, so that the lower nail body blocks the liquid injection hole of the battery cell. According to the equipment, the infiltration difficulty of the cylindrical battery cell can be reduced, the infiltration time is shortened, the infiltration effect is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cell preparation, in particular to a negative pressure infiltration auxiliary device for cells and a cell. Background Art

[0002] The electrolyte is the core part of the lithium-ion battery research and development. It is not only an important medium to ensure ion transmission, but also an important basis for the battery to obtain high voltage and high specific energy. The relevant parameters of the electrolyte and its wettability to the electrode sheet and diaphragm directly affect the performance of the battery. The evaluation of the infiltration of the electrolyte in the electrode sheet can be used as a key index for the process optimization at the electrode sheet level, and can also provide a new direction for the research and development of high-performance batteries.

[0003] For cylindrical lithium-ion batteries, due to the high group margin and small internal space of the cell, the infiltration of the cell is relatively more difficult than that of square shell and soft-pack batteries. If the gas inside the wound core cannot be discharged smoothly, serious problems such as black spots and lithium deposition will occur at the interface of the positive and negative electrode sheets after formation and grading of the cell. In the actual production process, usually, the cell after injection is left standing for a period of time to complete the infiltration process of the electrode sheet. The infiltration process generally takes 2 - 5 days and is carried out at a temperature of 35°C - 55°C. It can be seen that relying only on the standing process, the gas discharge process inside the cell is slow, requiring a long time cost, resulting in high actual production cost. Summary of the Utility Model

[0004] Based on the above description, the utility model provides a negative pressure infiltration auxiliary device for cells and a cell, aiming to solve technical problems such as the infiltration effect of the existing cells to be improved.

[0005] A negative pressure infiltration auxiliary device for cells, comprising:

[0006] A sealed suction nozzle, inside the cavity of which a rubber nail is fixed, and a negative pressure extraction pipeline connecting to an air extraction device is arranged on the sealed suction nozzle;

[0007] The rubber nail includes a nail head and a lower nail body connected to the lower end of the nail head, and the upper end face of the nail head exposes the sealed suction nozzle;

[0008] A servo motor group, on which a negative pressure cavity is provided, and inside the negative pressure cavity there is a push rod, and the first end of the push rod is connected to the servo motor group;

[0009] When the negative pressure cavity is under negative pressure, it adsorbs the upper end face of the nail head;

[0010] When the push rod presses down the rubber nail, the lower nail body blocks the liquid injection hole of the cell.

[0011] Furthermore, the rubber nail further includes an upper nail body connected to the upper end of the nail head, and when the push rod presses down the rubber nail, the second end of the push rod contacts the upper nail body.

[0012] Further, a solenoid valve is provided on the negative pressure extraction pipeline.

[0013] Further, a first pressure sensor is provided on the negative pressure extraction pipeline.

[0014] Further, the lower end face of the nail head is coated with a colloid.

[0015] Further, it further includes:

[0016] A base, the base is provided with a groove for accommodating the battery cell, and a second pressure sensor is provided at the bottom of the groove.

[0017] Further, an annular protrusion is provided on the lower nail body, and the annular protrusion is in interference fit with the liquid injection hole of the battery cell.

[0018] Further, the material of the glue nail is rubber.

[0019] A battery cell, the battery cell is formed by using the foregoing battery cell negative pressure infiltration assisting device to assist in the infiltration process.

[0020] The beneficial technical effects of the present utility model are: providing a battery cell negative pressure infiltration assisting device, after injecting electrolyte into the battery cell, extracting negative pressure inside the battery cell and driving in glue nails to seal the liquid injection holes, so that the infiltration is carried out under negative pressure inside the battery cell, reducing the viscosity of the electrolyte, improving the infiltration effect of the battery cell, especially for cylindrical battery cells, reducing the infiltration difficulty of cylindrical battery cells, promoting the discharge of gas inside the battery cell during the infiltration process, eliminating air blocks between the electrode plates and the separator, ensuring good interfaces between the positive and negative electrode plates after formation and grading of the battery cell, shortening the infiltration time, and reducing production costs. Description of the Drawings

[0021] Figure 1-2 It is a schematic structural diagram of a battery cell negative pressure infiltration assisting device of the present utility model.

[0022] Wherein, 1 - sealing suction nozzle; 2 - glue nail; 201 - nail head; 202 - lower nail body; 2021 - annular protrusion; 203 - upper nail body; 3 - negative pressure extraction pipeline; 301 - solenoid valve; 302 - first pressure sensor; 4 - servo motor group; 5 - negative pressure cavity; 6 - push rod; 7 - battery cell; 701 - liquid injection hole; 8 - colloid; 9 - base; 901 - groove; 902 - second pressure sensor. Detailed Embodiments

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0025] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, but it is not limited to the present utility model.

[0026] See Figure 1-2 , the present utility model provides an auxiliary device for negative pressure infiltration of battery cells, including:

[0027] A sealed suction nozzle (1), inside the cavity of the sealed suction nozzle (1) there is a rubber nail (2), and a negative pressure extraction pipe (3) connecting to an extraction device is arranged on the sealed suction nozzle (1);

[0028] The rubber nail (2) includes a nail head (201) and a lower nail body (202) connected to the lower end of the nail head (201), and the upper end surface of the nail head (201) exposes the sealed suction nozzle (1);

[0029] A servo motor group (4), on the servo motor group (4) there is a negative pressure cavity (5), inside the negative pressure cavity (5) there is a push rod (6), and the first end of the push rod (6) is connected to the servo motor group (4);

[0030] The negative pressure cavity (5) adsorbs the upper end surface of the nail head (201) under negative pressure;

[0031] When the push rod (6) presses down the rubber nail (2), the lower nail body (202) blocks the liquid injection hole (701) of the battery cell (7).

[0032] Further, the negative pressure cavity (5) is cylindrical.

[0033] The servo motor set (4) is mainly used to form a negative pressure cavity by pumping negative pressure, which is used to adsorb the upper end face of the glue nail head, transfer the glue nail and the sealing nozzle to above the negative electrode cover plate of the battery cell, align the glue nail with the liquid injection hole on the negative electrode cover plate of the battery cell, and then the servo motor set drives the negative pressure cavity - sealing nozzle to press down until it contacts the negative electrode cover plate of the battery cell. After the sealing nozzle contacts and seals the negative electrode cover plate of the battery cell, the air extraction device connected to the air extraction pipeline (3) extracts air to extract the gas inside the battery cell, so that a negative pressure is formed inside the battery cell. Then, the servo motor set drives the plug rod to press down to insert the lower nail body of the glue nail into the liquid injection hole, thereby sealing the liquid injection hole. After completing the negative pressure extraction and inserting the glue nail, the battery cell is placed in an environment of 25°C to 55°C and left to stand and soak for 12h to 60h to complete the soaking process after the battery cell is injected with liquid. The utility model soaks the battery cell while keeping the inside of the battery cell under negative pressure, reduces the viscosity of the electrolyte, improves the soaking effect of the battery cell, is especially used for cylindrical battery cells, promotes the discharge of gas inside the battery cell during the soaking process, eliminates the air blocks between the electrode plates and the separator, ensures good interfaces between the positive and negative electrode plates after formation and grading of the battery cell, shortens the soaking time, and reduces the production cost.

[0034] Further, the glue nail (2) further includes an upper nail body (203) connected to the upper end of the nail head (201), and when the push rod (6) presses down the glue nail (2), the second end of the push rod (6) contacts the upper nail body (203).

[0035] Due to the adsorption force acting on the upper end face of the glue nail head at the lower end of the negative pressure cavity, the upper nail body of the glue nail enters the inside of the negative pressure cavity, and the push rod presses down to apply pressure to the upper nail body, so that the whole glue nail moves downward and the lower nail body enters the liquid injection hole.

[0036] The upper nail body (203) can also be used to manually grasp the upper nail body (203) to pull out the glue nail when it is necessary to pull out the glue nail from the liquid injection hole after processes such as soaking are completed.

[0037] Further, an electromagnetic valve (301) is provided on the air extraction pipeline (3).

[0038] Further, a first pressure sensor (302) is provided on the air extraction pipeline (3).

[0039] The first pressure sensor (302) is a gas pressure sensor.

[0040] The inside of the battery cell is evacuated to a negative pressure state through a negative pressure extraction pipeline, and the negative pressure value can be precisely regulated by a gas pressure sensor and a solenoid valve on the pipeline. The pressure sensor (302) is electrically connected to the solenoid valve (301). When air needs to be extracted, the solenoid valve (301) is opened to allow the air extraction device to extract air. The pressure sensor detects the air pressure state inside the sealing nozzle. After the air extraction causes the air pressure state inside the sealing nozzle to reach a certain negative pressure, the solenoid valve (301) is closed, so that a certain negative pressure is formed inside the battery cell.

[0041] Further, when the negative pressure inside the battery cell reaches -10 to -90 kPa, the solenoid valve is closed to stop air extraction.

[0042] Preferably, when the negative pressure inside the battery cell reaches -40 to -80 kPa, the solenoid valve is closed to stop air extraction.

[0043] Further, the lower end face of the nail head (201) is coated with a colloid (8).

[0044] The measure of applying glue is added to the lower end face of the nail head. After the lower nail body of the glue nail is driven into the liquid injection hole, the contact between the lower end face of the top head and the negative electrode cover plate of the battery cell is made closer due to the colloid, maintaining the existing negative pressure state inside the battery cell.

[0045] Further, it further includes:

[0046] A base (9), the base (9) is provided with a groove (901) for accommodating the battery cell (7), and a second pressure sensor (902) is provided at the bottom of the groove (901).

[0047] The second pressure sensor (902) is electrically connected to the servo motor group (4). When the servo motor group (4) drives the negative pressure cavity - sealing nozzle to press down until it contacts the negative electrode cover plate of the battery cell, the battery cell will also bear a certain pressure. The second pressure sensor (902) on the base (9) detects the pressure signal, and thus feeds back to regulate the downward pressing stroke of the servo motor group. When a certain pressure is detected, it can be determined that the sealing nozzle forms a seal for the liquid injection hole, so that the servo motor group (4) stops pressing the sealing nozzle downward. The sealing nozzle has a certain compression amount, maintaining a good sealing effect with the negative electrode cover plate of the battery cell.

[0048] Further, the lower nail body (202) is provided with an annular protrusion (2021), and the annular protrusion (2021) is in interference fit with the liquid injection hole (701) of the battery cell (7).

[0049] By providing an annular protrusion in interference fit with the liquid injection hole, the lower nail body of the glue nail is not easily withdrawn from the liquid injection hole after being driven in, maintaining the stability of the negative pressure.

[0050] Further, the material of the glue nail (2) is rubber.

[0051] Furthermore, the material of the colloid (8) is a resin hot-melt pressure-sensitive adhesive.

[0052] Furthermore, the rubber is nitrile rubber, ethylene propylene diene monomer rubber or fluororubber.

[0053] In addition, an auxiliary device for negative-pressure infiltration of an electric core of the present utility model can be used not only in the electric core infiltration scenario, but also in the aging process after the formation process. First, a sealed nozzle is used to adsorb the electric core cover plate, the inside of the electric core is evacuated, the device is used to insert a glue nail to seal the inside of the electric core, and the aging process is carried out. Then, the glue nail is pulled out, and the liquid injection hole is sealed again.

[0054] The present utility model provides an electric core, and the electric core is formed by using the aforementioned auxiliary device for negative-pressure infiltration of an electric core to assist in the infiltration process.

[0055] The above are only the preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A negative pressure infiltration assistance device for an electric core, characterized in that, Including: A sealed suction nozzle, with a glue nail fixed inside the cavity of the sealed suction nozzle, and a negative pressure extraction pipeline connected to an air extraction device is arranged on the sealed suction nozzle; The glue nail includes a nail head and a lower nail body connected to the lower end of the nail head, and the upper end surface of the nail head exposes the sealed suction nozzle; A servo motor group, with a negative pressure cavity arranged on the servo motor group, and a push rod arranged inside the negative pressure cavity, and the first end of the push rod is connected to the servo motor group; The negative pressure cavity adsorbs the upper end surface of the nail head under negative pressure; When the push rod presses down the glue nail, the lower nail body plugs the liquid injection hole of the battery cell.

2. The negative pressure infiltration assisting device for an electric core according to claim 1, wherein, The glue nail further includes an upper nail body connected to the upper end of the nail head, and when the push rod presses down the glue nail, the second end of the push rod contacts the upper nail body.

3. The negative pressure infiltration assistance device for an electric core according to claim 1, characterized in that, An electromagnetic valve is arranged on the negative pressure extraction pipeline.

4. The negative pressure infiltration assistance device for an electric core according to claim 1, wherein, A first pressure sensor is arranged on the negative pressure extraction pipeline.

5. The negative pressure infiltration assistance device for an electrode core according to claim 1, wherein The lower end surface of the nail head is coated with a colloid.

6. The negative pressure infiltration assistance device for an electric core according to claim 1, characterized in that, Further including: A base, with a groove for accommodating the battery cell arranged on the base, and a second pressure sensor arranged at the bottom of the groove.

7. The negative pressure infiltration assistance device for an electric core according to claim 1, characterized in that, A ring-shaped protrusion is arranged on the lower nail body, and the ring-shaped protrusion is in interference fit with the liquid injection hole of the battery cell.

8. The negative pressure infiltration assistance device for an electric core according to claim 1, wherein, The material of the glue nail is rubber.

9. A battery cell, characterized in that, The battery cell is formed by using an auxiliary device for negative pressure infiltration of a battery cell as described in any one of claims 1-8 to assist in the infiltration process.

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