CN105206788A - Simple and easy efficient trace annotates liquid equipment - Google Patents

Abstract

The invention discloses a simple and high-efficiency micro-volume liquid injection device, which includes a driving cylinder, the driving cylinder is connected with a rubber piston arranged in a metering tube through a connecting rod, and the metering tube is connected with a liquid storage tank. The liquid storage tank is provided with an external connecting pipe for transporting the electrolyte, the external connecting pipe is provided with a first one-way valve to control the circulation of the electrolyte, the liquid storage tank is connected with the liquid separator and a There is a second one-way valve for controlling the circulation of the electrolyte, and the liquid distributor includes a liquid distributor pipe body, and more than one liquid outlet pipe is arranged on the liquid distributor pipe body. The invention adopts cylinder drive, stroke quantitative, one-way valve control and special liquid separator design, the purpose is to provide a high-efficiency liquid injection equipment for micro-electrolyte and other liquids through simple structural design, and one stroke can be driven Complete the liquid suction and electrolyte filling process of multiple batteries.

Description

A simple and efficient micro-injection device

technical field

The invention relates to the field of lithium battery preparation, in particular to a simple and efficient micro-volume liquid injection device.

Background technique

Since the birth of lithium-ion batteries, with the continuous advancement of technology, its performance has been significantly improved compared to before. As far as the current chemical secondary power source is concerned, it has an irreplaceable role, especially with the advent of the energy crisis and the increasing environmental pressure, the market demand for lithium-ion battery applications is increasing, and it has been used as a power source for electric vehicles field. As the power source of electric vehicles, lithium-ion batteries face performance pressures such as high capacity and high power density.

With the increasing demand for volume energy density of lithium-ion batteries, materials and processes are constantly improving. However, for a material, the increase in its capacity has gradually become a bottleneck, and it is difficult to achieve a large degree of progress in the short term. Therefore, the process The improvement has also become a way to increase the energy density of the battery body. In order to increase the volume energy density of the battery under the unit volume, it is necessary to increase the amount of material filling inside the shell, so the vacuum gap inside the battery is gradually compressed, and the space for the electrolyte inside the battery is getting smaller and smaller. Sufficient electrolyte retention is a key factor to maintain battery cycle performance. High initial liquid injection is a possible way to achieve it. However, with the reduction of the internal void space of the battery and the gas production during the formation process, Excessive electrolyte filling will cause serious battery spraying. The test results show that one overcharge is basically sprayed out during the formation process, and it is difficult to meet the standard liquid retention requirements of the battery. Moreover, the spraying phenomenon during the formation process seriously affects the environment of the workshop, corrodes the surface of the shell, and causes problems such as electrolyte waste. Therefore, the first liquid injection should ensure that too much electrolyte does not flow out during the formation process as much as possible. To solve this contradiction, it is necessary not to inject too much liquid at one time and to ensure the electrolyte demand of the later battery cycle. This requires the introduction of a secondary liquid injection process in the battery production process. The first injection ensures the amount of electrolyte formed by the battery. After the battery is formed, add a small amount of electrolyte.

The characteristics of the secondary electrolysis are: low precision, micro-quantity, and high efficiency, but there is no professional equipment for filling the secondary electrolyte in the current technical field. The traditional pump type relies on the number of rotations to control the efficiency is low and can only be filled at one time. In view of the demand characteristics of the secondary liquid injection equipment, this invention proposes this kind of equipment that can be filled with high efficiency.

Contents of the invention

The purpose of the present invention is to provide a simple and efficient micro-injection device, which can use the driving cylinder to drive the piston to complete the electrolyte suction and discharge process. The introduction of the liquid separator can greatly improve the electrolyte filling efficiency within a certain range of accuracy. The diameter of the liquid outlet pipe of the dispenser is designed with a small size, which can generate enough capillary force to make the liquid dispenser achieve the effect of uniform distribution of the liquid by means of a balanced internal pressure, so it is suitable for filling a small amount of electrolyte.

To achieve the above object, the present invention provides the following technical solutions:

A simple and high-efficiency micro-injection device, including a driving cylinder that provides power, the driving cylinder is connected to a metering tube, and the driving cylinder is connected to a rubber piston arranged in the metering tube through a connecting rod. The liquid tanks are connected, the liquid storage tank is provided with an external connecting pipe for transporting the electrolyte, the external connecting pipe is provided with a first one-way valve to control the circulation of the electrolyte, and the liquid storage tank and the liquid separator The two are connected with each other and a second one-way valve for controlling the flow of electrolyte is provided between the two. The liquid distributor includes a liquid distributor pipe body, and more than one liquid outlet pipe is arranged on the liquid distributor pipe body.

Preferably, the liquid storage tank is provided with two external connecting pipes, the first one-way valve includes a stainless steel valve body and a stainless steel spring inside it, and the stainless steel valve body and the base with holes are threaded Connection, one end of the stainless steel spring is supported on the perforated base, and the other end is supported on the liquid flow hole of the stainless steel valve body through a hemispherical plug.

Preferably, the second one-way valve includes a threaded base connected to the liquid dispenser and a spring supported on the threaded base at one end, and the other end of the spring is supported at the inlet of the liquid dispenser through a hemispherical plug.

Preferably, the rubber piston, the hemispherical plugs in the first one-way valve and the second one-way valve are all made of corrosion-resistant silicon rubber.

Preferably, the inlet of the liquid outlet pipe is provided with a porous baffle for slowing down the flow rate of the electrolyte, and the diameter of the liquid outlet pipe is 1-1.5mm.

Preferably, the inner diameter of the liquid storage tank is 2 to 3 times the inner diameter of the metering tube, and the liquid storage tank is provided with a positioning bracket for connecting to multi-station automation equipment.

Preferably, an air vent is provided on the liquid storage tank.

Preferably, the metering tube is made of transparent tempered glass.

Preferably, the inner diameter of the metering tube is 10-20mm

Compared with prior art, the beneficial effect of the present invention is:

1. The structural design of the present invention can complete the filling of electrolytes for multiple batteries at one time, effectively improving the filling efficiency of battery electrolytes; at the same time, this design uses the principle of differential pressure to design a simple one-way valve structure, During the working process, the driving cylinder drives the rubber piston to move up and down in the metering tube through the connecting rod to change the pressure inside the liquid storage tank to realize liquid suction and discharge, and the operation is simple and fast.

2. The caliber of the liquid outlet pipe of the liquid dispenser is designed with a small size, which can generate enough capillary force to make the liquid dispenser achieve a uniform liquid discharge effect by relying on a balanced internal pressure, which not only ensures a certain injection accuracy, but also avoids other problems. The phenomenon of dripping and leakage occurs, which is suitable for filling a small amount of electrolyte; driven by a single cylinder, the energy consumption cost is low, which is conducive to saving production costs.

3. The metering tube is made of tempered glass, and the transparent structure can facilitate the observation of the internal liquid absorption state, and the phenomenon of internal gas residence can be found in time and eliminated early, so as to avoid the reduction of liquid injection accuracy caused by the compressibility of the gas Phenomenon; the liquid storage tank is provided with a positioning bracket, which facilitates the integration of the device into the multi-station automation equipment through the positioning bracket.

4. The liquid storage tank is provided with two external connecting pipes, which can avoid the phenomenon of poor liquid absorption caused by insufficient negative pressure; the entrance of the liquid outlet pipe is provided with a porous baffle for slowing down the flow rate of the electrolyte, which can avoid The phenomenon of uneven liquid distribution caused by the speed impulse of the liquid discharge process.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural representation of the drive cylinder in the present invention;

Fig. 3 is the structural representation of the first one-way valve among the present invention;

Fig. 4 is the structural representation of the second one-way valve among the present invention;

In the figure, 1. Drive cylinder, 2. Metering tube, 3. Connecting rod, 4. Rubber piston, 5. Liquid storage tank, 6. External connecting pipe, 7. First one-way valve, 8. Stainless steel valve body, 9 , stainless steel spring, 10, base with holes, 11, hemispherical plug of the first one-way valve, 12, second one-way valve, 13, threaded base, 14, pipe body of liquid dispenser, 15, liquid outlet pipe, 16 , positioning bracket, 17, hemispherical plug of the second one-way valve, 18, porous baffle

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figures 1 to 4, a simple and efficient micro-injection device includes a driving cylinder 1 that provides power, the driving cylinder 1 is connected to the metering tube 2, and the driving cylinder 1 is connected to the The rubber piston 4 in the metering tube 2 is connected to each other, and the driving cylinder 1 drives the rubber piston 4 to move in the metering tube 2, thereby completing the suction and discharge process of the electrolyte. The metering tube 2 is made of tempered glass, and its transparent structure can It is convenient to observe the state of liquid absorption inside the metering tube 2, and it is possible to detect the phenomenon of internal gas residence in time and eliminate it early, so as to avoid the reduction of liquid injection accuracy caused by the compressibility of the gas.

The metering tube 2 communicates with the liquid storage tank 5, and the liquid storage tank 5 is provided with two external connection pipes 6 for transporting the electrolyte, and the external connection pipe 6 is provided with a first valve for controlling the circulation of the electrolyte solution. A one-way valve 7, the first one-way valve 7 includes a stainless steel valve body 8 and a stainless steel spring 9 located inside it, the stainless steel valve body 8 is threadedly connected to the perforated base 10, and the stainless steel spring 9 One end is supported by the perforated base 10, and the other end is supported by the liquid flow hole of the stainless steel valve body 8 through the hemispherical plug 11 of the first one-way valve.

The liquid storage tank 5 communicates with the liquid separator 11 and a second one-way valve 12 for controlling the circulation of the electrolyte is arranged between the two, and the second one-way valve 12 includes a screw thread connected to the liquid separator 11 The base 13 and the spring supported on the threaded base at one end, the other end of the spring is supported at the inlet of the liquid distributor through the hemispherical plug 17 of the second one-way valve, the liquid distributor 11 includes a liquid distributor tube 14, and the liquid distributor The tube body 14 is provided with more than one outlet pipe 15; the hemispherical plugs in the rubber piston 4, the first one-way valve 7 and the second one-way valve 12 are all made of corrosion-resistant silicon rubber. .

The entrance of the liquid outlet pipe 15 is provided with a porous baffle 18 for slowing down the flow rate of the electrolyte, which can avoid uneven liquid separation caused by the velocity impulse during the liquid discharge process. The diameter of the liquid outlet pipe is 1- 1.5mm, the small-scale design can effectively use the capillary force to avoid liquid leakage such as dripping, and is suitable for the micro-injection process of 5-10 grams.

The inner diameter of the liquid storage tank 5 is 2 to 3 times the inner diameter of the metering tube 2, the inner diameter of the metering tube 2 is 10-20mm, and the liquid storage tank 5 is provided with a multi-station automation equipment The positioning bracket 16, the liquid storage tank 5 is provided with an exhaust port.

The working process of the present invention is as follows: after the equipment has been positioned and installed, the driving cylinder 1 drives the rubber piston 4 through the connecting rod 3 to move up to form a negative pressure as shown in Figure 1, and the hemispherical plug 11 of the first one-way valve is under the external pressure. Driven to leave the liquid flow hole of the stainless steel valve body 8, the electrolyte flows into the liquid storage tank 5, and at the same time, the inflow of the electrolyte is controlled by controlling the moving distance of the rubber piston 4 in the metering tube 2; when the stroke is reached, the cylinder 1 is driven The connecting rod 3 drives the rubber piston 4 to move down to form a positive pressure, and the internal pressure drives the hemispherical plug 17 of the second one-way valve to separate from the inlet pipe wall of the separator 11, and the electrolyte flows into the liquid separator pipe 14 and then enters the outlet Pipe 15, the entrance of the liquid outlet pipe 15 is provided with a porous baffle 18 for slowing down the flow rate of the electrolyte. After being decelerated by the porous baffle 18, it is evenly divided into the liquid outlet pipe 15 under the drive of internal pressure, and the electrolyte can be completed. filling process.

The second liquid replenishment process is different from the first liquid injection (requires multiple vacuums). The second liquid injection only needs one vacuum pump to inject these micro-electrolyte fluids into the battery cell. The one-time vacuum pumping process takes a very short time. The process of adding liquid in liquid equipment has become the bottleneck of improving the efficiency of liquid injection, and this equipment can increase the efficiency of liquid addition by more than several times, and it can be coordinated and applied to liquid injection equipment to achieve the purpose of greatly improving production efficiency.

This design effectively utilizes the differential pressure driving principle to design a simple one-way valve structure. The driving cylinder 1 drives the rubber piston 4 to move up and down in the metering tube 2 through the connecting rod 3 to change the pressure inside the liquid storage tank 5. When the rubber piston 4 moves up When the internal pressure decreases, the external pressure overcomes the pressure produced by the stainless steel spring 9 in the first one-way valve 7 and separates the hemispherical plug 11 of the first one-way valve from the wall surface of the stainless steel valve body 8, and the electrolyte flows into the liquid storage tank 5, The stainless steel valve body 8 and the base adopt a simple design of threaded connection, so that the spring pressure can be adjusted to avoid changes in the spring elasticity during long-term use. The internal structural parts are made of corrosion-resistant materials to avoid corrosion of the electrolyte, and the split design can be disassembled. , which facilitates maintenance such as cleaning of the first one-way valve 7 . When the rubber piston 4 moves down, the hemispherical plug 11 of the first one-way valve is in close contact with the wall surface, and the internal pressure increases to drive the hemispherical plug 17 of the second one-way valve in the liquid distributor 11 to separate from the pipe wall, and the electrolyte flows into In the liquid separator 11, the isolation and speed reduction of the porous baffle 18 effectively avoids the phenomenon of uneven liquid separation caused by the flow rate of the liquid, so that the liquid injection accuracy can be controlled within a certain range (the error is about 5%). At the same time, through the design of the small diameter (10-20mm) in the metering tube 2, the precision control of the stroke of the driving cylinder 1 to the electrolyte volume can be improved, and the several liquid outlet tubes 15 from the liquid separator 11 all use longer capillary tubes. It can effectively prevent dripping and other phenomena, and the position of the liquid injection can be determined by adjusting the length of the liquid outlet pipe 15. The positioning bracket 16 on the liquid storage tank 5 is used to install the device on a multi-station automatic liquid injection machine. It can replace the existing pump injection station and solve the bottleneck problem of low injection efficiency.

The above content is only an example and description of the structure of the present invention. Those skilled in the art make various modifications or supplements to the described specific embodiments or replace them in similar ways, as long as they do not deviate from the structure of the invention or Anything beyond the scope defined in the claims shall belong to the protection scope of the present invention.

Claims (9)

1. A simple and efficient micro-injection device, including a driving cylinder that provides power, and the driving cylinder is connected to a metering tube, characterized in that: the driving cylinder is connected to a rubber piston arranged in the metering tube through a connecting rod, The metering tube communicates with the liquid storage tank, the liquid storage tank is provided with an external connecting pipe for transporting the electrolyte, the external connecting pipe is provided with a first one-way valve for controlling the circulation of the electrolyte, and the storage tank The liquid tank is connected with the liquid distributor, and a second one-way valve for controlling the circulation of the electrolyte is provided between the two. The liquid distributor includes a liquid distributor pipe body, and more than one Outlet tube. 2. The simple and efficient micro-volume liquid injection device according to claim 1, characterized in that: the liquid storage tank is provided with two external connecting pipes, and the first one-way valve includes a stainless steel valve body and a The internal stainless steel spring, the stainless steel valve body and the perforated base are threadedly connected, one end of the stainless steel spring is supported on the perforated base, and the other end is supported on the liquid flow hole of the stainless steel valve body through a hemispherical plug. 3. The simple and efficient micro-injection device according to claim 2, characterized in that: the second one-way valve includes a threaded base connected to the liquid dispenser and a spring supported on the threaded base at one end, and the spring is another One end is supported at the inlet of the dispenser by a hemispherical plug. 4. The simple and efficient micro-injection device according to claim 3, characterized in that: the rubber piston, the hemispherical plugs in the first one-way valve and the second one-way valve are all made of corrosion-resistant silicon Made of rubber. 5. The simple and efficient micro-volume liquid injection device according to claim 4, characterized in that: the inlet of the liquid outlet pipe is provided with a porous baffle for slowing down the flow rate of the electrolyte, and the diameter of the liquid outlet pipe is 1-1.5mm. 6. The simple and efficient micro-volume liquid injection device according to claim 5, characterized in that: the inner diameter of the liquid storage tank is 2 to 3 times the inner diameter of the metering tube, and the liquid storage tank is provided with a device for connecting multiple Positioning bracket for workstation automation equipment. 7. The simple and efficient micro-volume injection device according to claim 6, characterized in that: the inner diameter of the metering tube is 10-20mm. 8. The simple and efficient micro-volume liquid injection device according to claim 1, characterized in that: the liquid storage tank is provided with an exhaust port. 9. The simple and efficient micro-volume injection device according to claim 1, characterized in that: the metering tube is made of transparent tempered glass.