CN211125812U - Liquid injection cup - Google Patents

Abstract

The utility model discloses a liquid injection cup, including a cup body, a liquid inlet channel is provided at the top of the cup body, a liquid injection assembly is connected to the bottom of the cup body, the liquid injection assembly includes a cup bottom cover, a sealing cover and a liquid injection nozzle, the cup bottom cover is sealed to the cup body, the liquid injection nozzle is sealed to the cup bottom cover by the sealing cover, a connected liquid injection channel is provided in the liquid injection nozzle and the cup bottom cover, a spring is provided between the liquid injection nozzle and the cup bottom cover, and during liquid injection, the spring keeps the liquid injection nozzle and the battery in close contact. A reflux pipe with an inverted U-shaped structure is also provided between the liquid injection assembly and the cup body, so as to utilize the pressure difference to perform battery liquid injection. The beneficial effects of the utility model are as follows: a spring is provided between the liquid injection nozzle of the liquid injection assembly and the cup bottom cover, the spring is partially compressed during liquid injection, and when the external pressure changes, the spring can keep the liquid injection nozzle and the battery in close contact, so as to avoid splashing of electrolyte; a reflux pipe is provided between the cup body and the liquid injection assembly, and the pressure difference is utilized to guide liquid, so as to effectively avoid dripping of the liquid injection assembly.

Description

an injection cup

technical field

The utility model relates to the technical field of battery liquid injection, in particular to a liquid injection cup.

Background technique

Lithium batteries have the advantages of high capacity, small size and long life, and are widely used in mobile phones, computers and other fields. Especially in terms of new energy vehicles, hard-shell lithium batteries are used as the "gasoline" of new energy vehicles, and the quality of lithium batteries determines the battery life of new energy vehicles. Among them, lithium battery injection is a crucial step in the production process of lithium batteries. Lithium battery electrolyte is the carrier of ion transport in the battery, which plays the role of conducting ions between the positive and negative electrodes of the lithium battery, and is the guarantee for the lithium ion battery to obtain the advantages of high voltage and high specific energy. When the existing lithium battery liquid injection machine is in operation, the liquid injection nozzle of the liquid injection cup is sealed and connected to the liquid injection inlet of the lithium battery for liquid injection. In actual use, when the liquid injection machine is filled with electrolyte, the electrolyte directly impacts. When it reaches the liquid injection component, it will cause slight mechanical vibration, which will easily cause the misalignment of the liquid injection nozzle and the liquid injection inlet of the lithium battery, resulting in splashing of the electrolyte and affecting the accuracy of the liquid injection amount.

Utility model content

The technical problem to be solved by the utility model is to provide a liquid injection cup in view of the above-mentioned deficiencies of the prior art.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a liquid injection cup, including a cup body, a liquid inlet channel is arranged at the top of the cup body, and a liquid injection assembly is connected to the bottom end of the cup body, and the liquid injection assembly includes a cup body. Bottom cover, sealing cover and liquid injection nozzle, the bottom cover of the cup is sealed with the cup body, the liquid injection nozzle and the bottom cover of the cup are sealed together with a sealing cover, and the liquid injection nozzle and the bottom cover of the cup are provided with a connected liquid injection channel. There is a spring between the liquid injection nozzle and the bottom cover of the cup. Under the action of the spring and external force, the liquid injection nozzle can move in the vertical direction relative to the bottom cover of the cup, and keeps close contact with the battery during liquid injection.

In the technical solution, a sealing ring is used for sealing connection between the cup bottom cover and the cup body.

In the technical solution, a spring pad is arranged between the spring and the liquid injection nozzle.

In the technical solution, a screw connection is adopted between the cup bottom cover and the sealing cover.

In the technical solution, the liquid inlet channel is provided with more than one liquid inlet in the horizontal direction, and the liquid is ejected from the liquid inlet in the horizontal direction.

In the technical solution, a return pipe is also included, one end of the return pipe is open to connect to the bottom cover of the cup, and the other end is open and fixed at a position close to the bottom end of the cup body, and the return pipe has an inverted U-shaped structure as a whole.

In the technical scheme, a liquid injection needle assembly is also included. The liquid injection needle assembly includes a liquid injection needle, a bracket table and a cylinder, the liquid injection needle is fixed on the bracket table, the cylinder is connected to the bracket table, and the two sides of the bracket table are connected with guide rods. Drive the liquid injection needle assembly to move up and down, and the guide rod assists in guiding; the bottom end of the liquid injection needle is provided with a liquid injection needle port, the liquid injection needle port is provided with a sealing ring, and the top of the liquid injection needle is provided with an electrolyte inlet, an electrolyte inlet A diaphragm valve is installed, a vacuum source interface is arranged on the side end of the liquid injection needle, and the liquid injection needle port, the electrolyte inlet and the vacuum source interface are internally connected.

In the technical solution, the main body of the liquid injection needle is provided with a spring structure, which is convenient for connection and contact with the liquid inlet channel of the cup body.

The beneficial effect of the utility model is that a spring is arranged between the liquid injection nozzle of the liquid injection component and the bottom cover of the cup, the spring is partially compressed during liquid injection, and when the external pressure changes, the spring can keep the liquid injection nozzle and the battery tightly Connected to avoid splashing of electrolyte; a return pipe is arranged between the cup body and the liquid injection assembly, and the pressure difference is used to conduct the liquid, which can effectively avoid the dripping of the liquid injection assembly.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the liquid injection cup of the present invention.

FIG. 2 is a schematic cross-sectional structure diagram of the position A in FIG. 1 .

FIG. 3 is an enlarged view of the position B in FIG. 2 .

4 is a schematic diagram of the overall structure of the liquid injection cup of the liquid injection needle assembly of the present invention.

5 is a schematic diagram of the overall structure of the liquid injection needle assembly of the present invention.

FIG. 6 is a cross-sectional structural view at position C of FIG. 5 .

In the figure, 1-cup body; 2-liquid inlet channel; 3-liquid injection assembly; 31-cup bottom cover; 32-sealing cover; 33-liquid injection nozzle; 34-spring; 35-spring washer; 36-first Sealing ring; 4-return pipe; 5-injection needle assembly; 51-injection needle; 511-injection needle port; 512-second sealing ring; 513-electrolyte inlet; 514-diaphragm valve; 515-vacuum source Interface; 52-support table; 53-cylinder; 54-guide rod.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

As shown in FIG. 1 is a liquid injection cup proposed by the present invention. The main body of the liquid injection cup is a cup body 1, the cup body 1 is designed as a columnar structure, and the top of the cup body 1 is provided with a liquid inlet channel 2. The channel 2 is connected with the external electrolyte pipeline, the inside of the cup body 1 is a cavity for storing electrolyte, and the bottom end of the cup body 1 is connected with a liquid injection component 3 . The liquid injection assembly 3 includes a cup bottom cover 31 , a sealing cover 32 and a liquid injection nozzle 33 . The cup bottom cover 31 is sealed with the cup body 1, and the cup bottom cover 31 and the cup body 1 can be sealed with a first sealing ring 36 at the connection position. There is a groove matching the liquid injection nozzle 33 . The sealing cover 32 is a concave-in-through structure, the liquid injection nozzle 33 is placed in the groove of the sealing cover, and the mouth of the liquid injection nozzle 33 protrudes from the middle-through position; the cup bottom cover 31 is connected with the sealing cover 32, and the filling The liquid nozzle 33 is limited in the space formed by the groove of the cup bottom cover 31 and the groove of the sealing cover 32 , and the liquid injection nozzle 33 is also provided with a through hole for conveying the electrolyte. The cup bottom cover 31 and the sealing cover 32 can be connected by screw threads. At the connection position, the cup bottom cover 31 is provided with an external thread, and the sealing cover 32 is provided with an internal thread. The internal and external threads cooperate with each other to make the cup bottom cover 31 and the sealing The cover 32 seals the connection.

In order to ensure that the liquid injection nozzle 33 can keep fully attached to the battery to be injected under the condition of slight vibration of the liquid injection machine as a whole, a groove is also provided in the liquid injection nozzle 33, and a spring 34 is arranged in the groove. One end of 34 contacts the bottom of the groove of the liquid injection nozzle 33 , and the other end contacts the bottom of the groove of the cup bottom cover 31 . A spring pad 35 can be added on the contact surface of the spring 34 and the liquid injection nozzle 33 . In a natural state, the liquid injection nozzle 33 is subjected to the elastic force of the spring 34, and the liquid injection nozzle 33 is closely attached to the bottom of the groove of the sealing cover. When the liquid injection cup needs to inject liquid into the battery, the liquid injection nozzle 33 is connected to the battery and pressed by the battery casing, the spring 34 is compressed, and the liquid injection nozzle 33 is tightly attached to the battery. If the liquid injection cup and the battery are affected by external vibration at this time, the spring 34 will be loosened according to the change of the external force, and then the position of the liquid injection nozzle 33 is adjusted so that the liquid injection nozzle 33 and the battery remain in contact.

Further, a return pipe 4 is arranged in the cup body 1 . The return pipe 4 has an inverted U-shaped structure as a whole. One end of the return pipe 4 is open to connect to the bottom cover 31 of the cup, and the other end is open and fixed at a position close to the bottom end of the cup body 1 . When the battery is not connected, the electrolyte enters the inside of the cup body 1 from the liquid inlet channel 2 , and the electrolyte solution needs to pass through the return pipe 4 to leave the cup body from the liquid injection nozzle 33 . Since the return pipe 4 has an inverted U-shaped structure, the electrolyte cannot be added when the battery is not connected. After the electrolyte is added into the cup body 1, the liquid injection nozzle 33 is connected to the battery to be injected with the liquid which has been evacuated inside. Since the inside of the battery is in a vacuum state and the inside of the main body 1 is in a normal pressure state, the electrolyte is pressed into the return pipe 4 under the pressure difference between the two, and flows through the liquid injection assembly 3 along the return pipe 4 into the battery. After the battery is filled with liquid, the pressure difference disappears, and the electrolyte cannot enter the battery, and the filling of the battery electrolyte is completed.

In the existing liquid inlet channel 2, the electrolyte is directly added into the cup body 1, and the liquid is directly added downward from the top of the cup body 1, which will just drop onto the return pipe 4, causing the electrolyte to splash. In order to avoid the above situation, the liquid inlet of the liquid inlet channel 2 is arranged in the horizontal direction, the number of liquid inlets is more than 1, the electrolyte is sprayed from the liquid inlet towards the horizontal direction, and the electrolyte is sprayed to the side of the cup body 1. On the wall, flow along the side wall to the bottom of the cup body 1.

As shown in Figures 4 and 5, the upper end of the liquid injection cup is connected with a liquid injection needle assembly. The liquid injection needle assembly includes a liquid injection needle, a bracket table and a cylinder. The liquid injection needle is fixed on the bracket table, and the cylinder is connected to the bracket table. Guide rods are connected on both sides of the support table, the cylinder drives the liquid injection needle assembly to move up and down, and the guide rods assist in guiding. The main body of the liquid injection needle is provided with a spring structure, which is convenient for connection and contact with the liquid injection cup. The bottom end of the liquid injection needle is provided with a liquid injection needle port. The liquid injection needle port is used to connect with the liquid inlet channel 2. The connection position with the liquid inlet channel 2 is provided with a sealing ring; the top of the liquid injection needle is provided with an electrolyte inlet, and the electrolyte inlet is equipped with a diaphragm valve for electrolyte filling control; the side end of the liquid injection needle is provided with a vacuum source interface, Connect the external vacuuming components; the injection needle port, the electrolyte inlet and the vacuum source interface are internally connected.

The specific steps for filling the liquid cup are as follows:

(1) The liquid injection needle port is connected to the liquid inlet channel 2, and the liquid injection nozzle 33 is connected to the battery to be injected;

(2) The diaphragm valve is closed, and the vacuum source vacuumizes the liquid injection cup and the battery to be injected through the vacuum source interface until the set vacuum value is reached, and the vacuum source is closed to vacuumize;

(3) Open the diaphragm valve to conduct the electrolyte inlet, the electrolyte enters the cup body 1 from the injection needle under the action of the pressure difference and gravity, and the electrolyte overcomes the gravity to enter the return pipe under the action of the pressure difference, and passes through the injection component. 3 into the battery;

(4) After the battery is filled with electrolyte, there is no pressure difference between the inside of the battery and the cup body 1, and the electrolyte cannot enter the inside of the battery;

(5) Close the diaphragm valve, separate the liquid injection needle port from the liquid inlet channel 2, and separate the liquid injection nozzle 33 from the battery to be injected to complete the liquid injection work.

The above embodiments are only intended to illustrate rather than limit the present invention, so all equivalent changes or modifications made according to the methods described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims (8)

1. A annotate liquid cup which characterized in that: including the cup, the cup top is equipped with inlet channel, and the cup bottom is connected with annotates the liquid subassembly, annotate the liquid subassembly and include bottom of cup lid, sealed lid and annotate the liquid mouth, bottom of cup lid and cup body sealing connection, annotate the liquid mouth and adopt sealed lid sealing connection together with the bottom of cup lid, annotate the liquid passageway that is equipped with the intercommunication in liquid mouth and the bottom of cup lid, annotate and be equipped with the spring between liquid mouth and the bottom of cup lid, annotate the liquid mouth under spring and exogenic action, can move on the vertical direction for bottom of cup lid, keep closely laminating with the battery when annotat.

2. The pouring cup according to claim 1, wherein: and the cup bottom cover is connected with the cup body in a sealing way by adopting a sealing ring.

3. The pouring cup according to claim 1, wherein: and a spring pad is arranged between the spring and the liquid injection nozzle.

4. The pouring cup according to claim 1, wherein: the cup bottom cover is in threaded connection with the sealing cover.

5. The pouring cup according to claim 1, wherein: the liquid inlet channel is provided with more than 1 liquid inlet in the horizontal direction, and liquid is sprayed out from the liquid inlets in the horizontal direction.

6. The pouring cup according to any of claims 1 to 5, wherein: the cup bottom cover is connected with the opening at one end of the backflow pipe, the opening at the other end of the backflow pipe is fixed at the position close to the bottom end of the cup body, and the backflow pipe is integrally of an inverted U-shaped structure.

7. The pouring cup according to claim 6, wherein: the liquid injection needle assembly comprises a liquid injection needle, a support platform and a cylinder, the liquid injection needle is fixed on the support platform, the cylinder is connected with the support platform, guide rods are connected with two sides of the support platform, the cylinder drives the liquid injection needle assembly to move up and down, and the guide rods assist in guiding; annotate the bottom of liquid needle and be equipped with notes liquid needle mouth, annotate liquid needle mouth and be equipped with the sealing washer, the top of annotating the liquid needle is equipped with the electrolyte entry, and the diaphragm valve is installed to the electrolyte entry, annotates the liquid needle side and is equipped with the vacuum source interface, annotates inside switching on of liquid needle mouth, electrolyte entry and vacuum source interface.

8. The pouring cup according to claim 7, wherein: the main body of the liquid injection needle is provided with a spring structure, so that the liquid injection needle is convenient to be connected and contacted with a liquid inlet channel of the cup body.

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