Pressure infusion mechanism and infusion method

Abstract

This invention provides a pressure infusion mechanism and method. The pressure infusion mechanism includes an infusion module and a metering module. The infusion module is used for inputting and outputting liquid and includes a storage tank, a positive / negative pressure switching valve, a first air pipe, an inlet valve, an inlet pipe, and an outlet pipe. The positive / negative pressure switching valve is connected to the storage tank via the first air pipe for inputting positive or negative pressure air. The inlet pipe is connected to the storage tank via the inlet valve, and one end of the outlet pipe is connected to the storage tank. The metering module is used to receive a preset volume of liquid and includes a piston drive, a piston, a capacity cup unit, a first liquid level pipe, a liquid level sensor, an inlet / outlet switching valve, and a filling pipe. The movable end of the piston drive is connected to the piston, which is embedded in the capacity cup unit. The piston is connected to the inlet / outlet switching valve, which is connected to the filling pipe and the outlet pipe of the infusion module. This pressure infusion mechanism is used to meterly deliver electrolyte to a battery and can replace the expensive and time-consuming metering pump.

Description

Technical Field

[0001] This invention belongs to the technical field of battery liquid injection equipment, and particularly relates to a pressure infusion mechanism and infusion method. Background Technology

[0002] The process of injecting a battery with a specified type and capacity of electrolyte is called electrolyte injection, which is necessary for establishing the battery's chemical system. Electrolyte injection is divided into the first injection after the battery casing is formed (first injection) and the second injection after formation (second injection, also known as replenishment). After the second injection, the battery needs to be evacuated to a pressure of 50±5 kPa, then filled with helium to a pressure of 90±5 kPa, and immediately sealed with a sealing pin in the injection hole. The difficulty of electrolyte injection lies in the slow wetting of the battery cell by the electrolyte, and the fact that the battery has only one small injection hole for both liquid inlet and outlet, which easily leads to trapped gas requiring venting, thus slowing down the injection process. Existing technology uses a breathing-style injection method—evacuating the battery first and then injecting electrolyte in small, multiple batches—to accelerate the injection speed.

[0003] Infusion refers to the supply of a fixed amount of electrolyte to an injection mechanism. Existing infusion methods typically use a metering pump, but existing metering pumps suffer from long customization cycles and high prices. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure infusion mechanism and infusion method, which aims to solve the problems of long customization cycle and high cost of infusion pumps in existing infusion methods that use infusion pumps.

[0005] The present invention is implemented as follows: a pressure infusion mechanism includes an infusion module and a metering module. The infusion module includes a storage tank, a positive and negative pressure switching valve, a first air pipe, an inlet valve, an inlet pipe, and an outlet pipe. The metering module includes a piston drive, a piston, a capacity cup unit, an air valve, a second air pipe, a first liquid level pipe, an air-liquid valve, a second liquid level pipe, a liquid level sensor, an inlet / outlet switching valve, and an injection pipe.

[0006] The positive and negative pressure switching valve is connected to the liquid storage tank through the first air pipe for inputting positive or negative pressure air. The liquid inlet pipe is connected to the liquid storage tank through the liquid inlet valve. One end of the liquid outlet pipe is connected to the liquid storage tank. The liquid delivery module is used to input liquid from the outside and output liquid to the metering module.

[0007] The capacity cup unit includes a capacity cup body. The movable end of the piston drive is connected to the piston, and the piston is embedded in the capacity cup body of the capacity cup unit. The piston has a channel inside, the outlet of the channel leads to the capacity cup body, and the inlet of the channel is on the surface of the portion of the piston exposed outside the capacity cup body. The common port of the inlet / outlet switching valve is fixed to the inlet of the channel. The inlet valve of the inlet / outlet switching valve is connected to the outlet pipe of the infusion module, and the outlet valve of the inlet / outlet switching valve is connected to the injection pipe.

[0008] The gas valve and the first liquid level tube are vertically fixed to the top of the volumetric cup body. The lower end of the gas-liquid valve is connected to the end of the first liquid level tube. The second liquid level tube is connected to the upper end of the gas-liquid valve and is vertically upward. The liquid level sensor is fixed to the outer side of the upper end of the second liquid level tube. The liquid level sensor is used to detect the position of the liquid in the second liquid level tube. The lower end of the gas valve is connected to the body of the volumetric cup body. The second gas tube is connected to the upper end of the gas valve.

[0009] The quantitative module is used to receive a preset volume of liquid;

[0010] The pressure infusion mechanism is used to deliver liquid in a quantitative manner.

[0011] Furthermore, the quantitative module also includes a mounting frame, a lead screw, a slide, a guide sleeve, and a guide post; the piston drive and the guide post are both fixed on the mounting frame, the guide sleeve is fixed on the slide and sleeved outside the guide post, the capacity cup unit is fixed on the guide post, the movable end of the piston drive is connected to one end of the lead screw, the other end of the lead screw is threadedly connected to the slide, and the piston is fixed on the slide.

[0012] Furthermore, the quantitative module also includes a limit switch sensor and a limit switch, wherein the limit switch sensor is fixed on the mounting bracket and the limit switch is fixed on the slide.

[0013] Furthermore, the quantitative module also includes a liquid level tube support, which is fixed on the capacity cup unit, and the gas-liquid valve and the liquid level sensor are fixed on the liquid level tube support.

[0014] Furthermore, the capacity cup unit also includes a pull rod, a capacity cup upper cover, and a capacity cup lower cover. The capacity cup lower cover is fixed to the top of the guide post. The pull rod and the capacity cup body are both fixed to the capacity cup lower cover. The capacity cup upper cover is fixed to the top of the pull rod and presses and seals the capacity cup body. The gas valve, the first liquid level tube, and the liquid level tube support are all fixed to the capacity cup upper cover.

[0015] To achieve the above-mentioned objectives, the present invention also provides a method for supplying liquid to an external battery liquid injection mechanism using the pressure infusion mechanism described in any one of the above claims, the method comprising the following steps:

[0016] Liquid aspiration: Close the infusion valve of the inlet / outlet switching valve, open the injection valve of the inlet / outlet switching valve, close the air valve, open the air-liquid valve and the inlet valve, open the negative pressure valve of the positive / negative pressure switching valve and introduce negative pressure air into the storage tank through the first air pipe, and the negative pressure air in the storage tank draws the liquid from the outside into the storage tank through the inlet pipe;

[0017] Infusion: Open the infusion valve of the inlet / outlet switching valve, close the injection valve of the inlet / outlet switching valve, close the negative pressure valve of the positive / negative pressure switching valve, and open the positive pressure valve of the positive / negative pressure switching valve to introduce positive pressure air into the storage tank. The positive pressure air in the storage tank causes the liquid in the storage tank to pass through the outlet pipe and then through the piston channel to reach the volumetric cup.

[0018] Quantitative: The piston drive drives the piston to rise and fall, so that the volume of the capacity cup changes to the preset capacity. After the liquid is input and fills the space inside the capacity cup, the liquid rises into the first liquid level tube and then into the second liquid level tube until the height of the liquid is sensed by the liquid level sensor. The liquid level sensor sends the information to the control system. The control system controls the positive pressure valve of the positive and negative pressure switching valve to close, stops the supply of positive pressure air, and at the same time closes the liquid inlet valve and the air-liquid valve of the liquid inlet / outlet switching valve, so that the liquid level in the first liquid level tube is still.

[0019] Dispensing liquid: Open the liquid injection valve and the air valve of the liquid inlet / outlet switching valve. The liquid in the volumetric cup flows downward into the external liquid injection mechanism. After the liquid level drops below the top cover of the volumetric cup, positive pressure air can be introduced through the air valve to force the remaining liquid and residual liquid in the volumetric cup into the external liquid injection mechanism until the preset volume of liquid in the volumetric cup is output to the external liquid injection mechanism.

[0020] Compared with the prior art, the beneficial effects of this invention are as follows:

[0021] 1. The liquid volume is controlled by a small-diameter liquid level tube and a liquid level sensor, resulting in high quantitative accuracy.

[0022] 2. By combining a storage tank and a metering module, the function of the existing metering pump is realized, which can solve the problems of long customization cycle and high price of metering pump. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a pressure infusion mechanism provided in an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the infusion module in the pressure infusion mechanism shown;

[0025] Figure 3 yes Figure 1 The diagram shows the structure of the metering module in the pressure infusion mechanism.

[0026] Explanation of reference numerals in the attached diagram:

[0027] 100-Infusion Module

[0028] 110 - Installation component, 120 - Storage tank, 130 - Positive / negative pressure switching valve, 140 - First gas pipe, 150 - Discharge pipe, 160 - Inlet valve, 170 - Inlet pipe

[0029] 200-Quantitative Module

[0030] 210-Mounting bracket, 220-Piston drive unit, 230-Screw, 240-Slide carriage, 250-Guide sleeve, 260-Guide post, 270-Piston, 280-Capacity cup unit, 281-Capacity cup body, 282-Pull rod, 283-Capacity cup top cover, 284-Capacity cup bottom cover, 290-Air valve, 2a0-Level tube bracket, 2b0-First level tube, 2c0-Air-liquid valve, 2d0-Level sensor, 2e0-Limit switch sensing element, 2f0-Limit switch, 2g0-Inlet / outlet switching valve, 2h0-Injection tube, 2j0-Second level tube, 2k0-Second air tube. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Please refer to Figure 1 This embodiment illustrates a pressure infusion mechanism that can be used to quantitatively deliver liquid to an external battery liquid injection mechanism. It includes an infusion module 100 and a metering module 200. The infusion module 100 is used to input liquid from the outside and output liquid to the metering module 200. The metering module 200 is used to receive liquid of a preset capacity.

[0034] Please refer to Figure 2 The infusion module 100 includes an installation component 110, a storage tank 120, a positive and negative pressure switching valve 130, a first air pipe 140, an outlet pipe 150, an inlet valve 160, and an inlet pipe 170.

[0035] The liquid storage tank 120 is fixed on the mounting part 110. The positive and negative pressure switching valve 130 is connected to the liquid storage tank 120 through the first air pipe 140 and is used to input positive or negative pressure air. The liquid inlet pipe 170 is connected to the liquid storage tank 120 through the liquid inlet valve 160, and one end of the liquid outlet pipe 150 is connected to the liquid storage tank 120.

[0036] Please refer to Figure 3 The quantitative module 200 includes a mounting bracket 210, a piston drive component 220, a lead screw 230, a slide 240, a guide sleeve 250, a guide post 260, a piston 270, a capacity cup unit 280, a gas valve 290, a liquid level tube support 2a0, a first liquid level tube 2b0, a gas-liquid valve 2c0, a liquid level sensor 2d0, a limit switch sensing element 2e0, a limit switch 2f0, an inlet / outlet switching valve 2g0, a liquid injection tube 2h0, a second liquid level tube 2j0, and a second gas tube 2k0. The capacity cup unit 280 includes a capacity cup body 281, a pull rod 282, a capacity cup upper cover 283, and a capacity cup lower cover 284.

[0037] Piston drive 220 and guide post 260 are both fixed to mounting bracket 210. Guide sleeve 250 is fixed to slide 240 and sleeved outside guide post 260. Capacity cup lower cover 284 is fixed to the top of guide post 260. Pull rod 282 and capacity cup body 281 are both fixed to capacity cup lower cover 284. Capacity cup upper cover 283 is fixed to the top of pull rod 282 and presses and seals capacity cup body 281. Gas valve 290, first liquid level tube 2b0 and liquid level tube bracket 2a0 are all fixed to capacity cup upper cover 283.

[0038] The movable end of the piston drive 220 is connected to one end of the lead screw 230, and the other end of the lead screw 230 is threaded to the slide 240. The piston 270 is fixed on the slide 240, so that the piston drive 220 can drive the slide 240 to move up and down with the piston 270.

[0039] The piston 270 is embedded in the capacity cup 281. The piston 270 has a channel inside. The outlet of the channel leads to the capacity cup 281. The inlet of the channel is on the surface of the part of the piston 270 that is exposed outside the capacity cup 281. The common port of the inlet / outlet switching valve 2g0 is fixed on the inlet of the channel. The inlet valve of the inlet / outlet switching valve 2g0 is connected to the outlet pipe 150 of the infusion module 100. The outlet valve of the inlet / outlet switching valve 2g0 is connected to the injection pipe 2h0.

[0040] The gas valve 290 and the first liquid level tube 2b0 are vertically fixed to the top of the capacity cup 281. The lower end of the gas-liquid valve 2c0 is connected to the end of the first liquid level tube 2b0. The second liquid level tube 2j0 is connected to the upper end of the gas-liquid valve 2c0 and is vertically upward. The liquid level sensor 2d0 is fixed to the outer side of the upper end of the second liquid level tube 2j0. The liquid level sensor 2d0 is used to detect the position of the liquid in the second liquid level tube 2j0. The lower end of the gas valve 290 is connected to the inside of the capacity cup 281. The second gas tube 2k0 is connected to the upper end of the gas valve 290.

[0041] Limit switch sensor 2e0 is fixed on mounting bracket 210, limit switch 2f0 is fixed on slide 240, liquid level tube bracket 2a0 is fixed on the upper cover 283 of the capacity cup, and gas-liquid valve 2c0 and liquid level sensor 2d0 are fixed on liquid level tube bracket 2a0.

[0042] The steps for using the above-mentioned pressure infusion mechanism to infuse fluid into the external battery filling mechanism are as follows:

[0043] Liquid aspiration: Close the infusion valve of the inlet / outlet switching valve 2g0, open the injection valve of the inlet / outlet switching valve 2g0, close the air valve 290, open the air-liquid valve 2c0 and the inlet valve 160, open the negative pressure valve of the positive / negative pressure switching valve 130 and introduce negative pressure air into the storage tank 120 through the first air pipe 140. The negative pressure air in the storage tank 120 draws the liquid from the outside into the storage tank 120 through the inlet pipe 170.

[0044] Infusion: Open the infusion valve of the inlet / outlet switching valve 2g0, close the injection valve of the inlet / outlet switching valve 2g0, close the negative pressure valve of the positive / negative pressure switching valve 130, open the positive pressure valve of the positive / negative pressure switching valve 130 to introduce positive pressure air into the storage tank 120. The positive pressure air in the storage tank 120 causes the liquid in the storage tank 120 to pass through the outlet pipe 150 and then through the channel of the piston 270 to reach the volume cup 281.

[0045] Quantification: The piston drive 220 drives the piston 270 to rise and fall, so that the volume in the capacity cup 281 changes to the preset capacity. After the liquid is input and fills the space in the capacity cup 281, the liquid rises into the first liquid level tube 2b0 and then into the second liquid level tube 2j0 until the height of the liquid is sensed by the liquid level sensor 2d0. The liquid level sensor 2d0 sends the information to the control system. The control system controls the positive pressure valve of the positive and negative pressure switching valve 130 to close, stops the supply of positive pressure air, and at the same time closes the liquid inlet valve and the air-liquid valve 2c0 of the liquid inlet / outlet switching valve 2g0, so that the liquid level in the first liquid level tube 2b0 is still.

[0046] Dispensing: Open the liquid injection valve and air valve 290 of the liquid inlet / outlet switching valve 2g0. The liquid in the volumetric cup 281 flows downward into the external liquid injection mechanism. After the liquid level drops below the volumetric cup cover 283, positive pressure air can be introduced through the air valve 290 to force the remaining liquid and residual liquid in the volumetric cup 281 into the external liquid injection mechanism until the preset volume of liquid in the volumetric cup 281 is discharged to the external liquid injection mechanism.

[0047] The pressure infusion mechanism of this embodiment uses a first liquid level tube 2b0 and a second liquid level tube 2j0 with a small diameter and a liquid level sensor 2d0 to control the liquid volume, which has high quantitative accuracy. By combining a storage tank 120 and a quantitative module 200, it realizes the function of the existing quantitative injection pump and can solve the problems of long customization cycle and high price of quantitative injection pump.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure infusion mechanism, characterized by, The device includes an infusion module and a quantitative module. The infusion module includes a storage tank, a positive and negative pressure switching valve, a first air tube, an inlet valve, an inlet pipe, and an outlet pipe. The quantitative module includes a piston drive, a piston, a capacity cup unit, an air valve, a second air tube, a first liquid level pipe, an air-liquid valve, a second liquid level pipe, a liquid level sensor, an inlet / outlet switching valve, and an injection pipe. The positive and negative pressure switching valve is connected to the liquid storage tank through the first air pipe for inputting positive or negative pressure air. The liquid inlet pipe is connected to the liquid storage tank through the liquid inlet valve. One end of the liquid outlet pipe is connected to the liquid storage tank. The liquid delivery module is used to input liquid from the outside and output liquid to the metering module. The capacity cup unit includes a capacity cup body. The movable end of the piston drive is connected to the piston, and the piston is embedded in the capacity cup body of the capacity cup unit. The piston has a channel inside, the outlet of the channel leads to the capacity cup body, and the inlet of the channel is on the surface of the portion of the piston exposed outside the capacity cup body. The common port of the inlet / outlet switching valve is fixed to the inlet of the channel. The inlet valve of the inlet / outlet switching valve is connected to the outlet pipe of the infusion module, and the outlet valve of the inlet / outlet switching valve is connected to the injection pipe. The gas valve and the first liquid level tube are vertically fixed to the top of the volumetric cup body. The lower end of the gas-liquid valve is connected to the end of the first liquid level tube. The second liquid level tube is connected to the upper end of the gas-liquid valve and is vertically upward. The liquid level sensor is fixed to the outer side of the upper end of the second liquid level tube. The liquid level sensor is used to detect the position of the liquid in the second liquid level tube. The lower end of the gas valve is connected to the body of the volumetric cup body. The second gas tube is connected to the upper end of the gas valve. The piston drive unit drives the piston to move up and down, so that the volume inside the capacity cup changes to a preset capacity, and the metering module is used to receive the preset capacity of liquid; The pressure infusion mechanism is used to deliver liquid in a quantitative manner.

2. The pressure infusion mechanism of claim 1, wherein, The quantitative module also includes a mounting frame, a lead screw, a slide, a guide sleeve, and a guide post; the piston drive and the guide post are both fixed on the mounting frame, the guide sleeve is fixed on the slide and sleeved outside the guide post, the capacity cup unit is fixed on the guide post, the movable end of the piston drive is connected to one end of the lead screw, the other end of the lead screw is threaded to the slide, and the piston is fixed on the slide.

3. The pressure infusion mechanism of claim 2, wherein, The quantitative module also includes a limit switch sensor and a limit switch. The limit switch sensor is fixed on the mounting bracket, and the limit switch is fixed on the slide.

4. The pressure infusion mechanism of claim 2, wherein, The quantitative module also includes a liquid level tube support, which is fixed on the capacity cup unit. The gas-liquid valve and the liquid level sensor are fixed on the liquid level tube support.

5. The pressure infusion mechanism of any one of claims 2 to 4, wherein, The capacity cup unit also includes a pull rod, a capacity cup top cover, and a capacity cup bottom cover. The capacity cup bottom cover is fixed to the top of the guide post. The pull rod and the capacity cup body are both fixed to the capacity cup bottom cover. The capacity cup top cover is fixed to the top of the pull rod and presses and seals the capacity cup body. The gas valve, the first liquid level tube, and the liquid level tube support are all fixed to the capacity cup top cover.

6. A method for supplying fluid to an external battery fluid injection mechanism using a pressure infusion mechanism as described in any one of claims 1-5, characterized in that, Includes the following steps: Liquid aspiration: Close the infusion valve of the inlet / outlet switching valve, open the injection valve of the inlet / outlet switching valve, close the air valve, open the air-liquid valve and the inlet valve, open the negative pressure valve of the positive / negative pressure switching valve and introduce negative pressure air into the storage tank through the first air pipe, and the negative pressure air in the storage tank draws the liquid from the outside into the storage tank through the inlet pipe; Infusion: Open the infusion valve of the inlet / outlet switching valve, close the injection valve of the inlet / outlet switching valve, close the negative pressure valve of the positive / negative pressure switching valve, and open the positive pressure valve of the positive / negative pressure switching valve to introduce positive pressure air into the storage tank. The positive pressure air in the storage tank causes the liquid in the storage tank to pass through the outlet pipe and then through the piston channel to reach the volumetric cup. Quantitative: The piston drive drives the piston to rise and fall, so that the volume of the capacity cup changes to the preset capacity. After the liquid is input and fills the space inside the capacity cup, the liquid rises into the first liquid level tube and then into the second liquid level tube until the height of the liquid is sensed by the liquid level sensor. The liquid level sensor sends the information to the control system. The control system controls the positive pressure valve of the positive and negative pressure switching valve to close, stops the supply of positive pressure air, and at the same time closes the liquid inlet valve and the air-liquid valve of the liquid inlet / outlet switching valve, so that the liquid level in the first liquid level tube is still. Dispensing liquid: Open the liquid injection valve and the air valve of the liquid inlet / outlet switching valve. The liquid in the volumetric cup flows downward into the external liquid injection mechanism. After the liquid level drops below the top cover of the volumetric cup, positive pressure air can be introduced through the air valve to force the remaining liquid and residual liquid in the volumetric cup into the external liquid injection mechanism until the preset volume of liquid in the volumetric cup is output to the external liquid injection mechanism.

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