A tee liquid injection valve

Abstract

This utility model discloses a three-way electrolyte injection valve, belonging to the field of electrolyte injection technology. It includes: a valve seat with a first flow channel, a second flow channel, and a third flow channel; a first valve for controlling the flow between the first and second flow channels; a second valve for controlling the flow between the second and third flow channels; and a back pressure structure for closing the first flow channel and opening it when the substance flowing from the first flow channel to the first valve reaches a preset pressure. When the second valve completes the vacuum extraction of the battery electrode, closing the second valve and opening the first valve, the sealing effect of the back pressure structure prevents the vacuum pressure from directly removing the electrolyte. Instead, after injecting electrolyte at a certain pressure, the electrolyte overcomes the preset pressure set by the back pressure structure before opening the first flow channel and flowing into the battery electrode through the first valve. This reduces the impact on the electrolyte injection volume and facilitates precise control of the injection volume.

Description

Technical Field

[0001] This utility model relates to the field of liquid injection technology, and in particular to a three-way liquid injection valve. Background Technology

[0002] There are various electrolyte injection processes in battery production, such as atmospheric pressure injection, vacuum injection, and pulse injection. Among them, vacuum injection can help the electrolyte penetrate better into the battery electrodes, and is especially suitable for batteries with a compact structure.

[0003] Battery vacuum electrolyte filling typically involves two steps: vacuuming and electrolyte filling. Existing technology achieves vacuum electrolyte filling by switching between vacuuming and electrolyte filling equipment. However, electrolyte is prone to leaking from the vacuuming port, and during vacuuming, electrolyte is also drawn out from the outlet, affecting the amount of electrolyte injected into the battery. Utility Model Content

[0004] The purpose of this utility model is to provide a three-way injection valve to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows: a three-way injection valve, comprising: a valve seat having a first flow channel, a second flow channel, and a third flow channel; a first valve element installed on the valve seat, the first valve element being used to control the connection and disconnection between the first flow channel and the second flow channel; a second valve element installed on the valve seat, the second valve element being used to control the connection and disconnection between the second flow channel and the third flow channel; and a back pressure structure installed in the first flow channel, the back pressure structure being used to close the first flow channel, and to open the first flow channel when the substance flowing towards the first valve element in the first flow channel reaches a preset pressure.

[0006] This technical solution has at least the following beneficial effects: When the second valve completes the vacuum extraction of the battery electrode, and the second valve is closed and the first valve is opened, due to the sealing effect of the back pressure structure, the vacuum pressure cannot directly extract the electrolyte. Instead, after injecting electrolyte at a certain pressure, the electrolyte overcomes the preset pressure set by the back pressure structure before it can open the first flow channel and flow into the battery electrode through the first valve, thereby reducing the impact on the amount of electrolyte injected into the battery and facilitating the control of the accuracy of the amount of electrolyte injected.

[0007] As a further improvement to the above technical solution, the back pressure structure includes a guide valve core and a first elastic element disposed within the first flow channel. The first flow channel has a stepped edge. The first elastic element is used to push the guide valve core to slide away from the first valve and abut against the stepped edge, causing the guide valve core to close the first flow channel. When the substance flowing towards the first valve in the first flow channel reaches a preset pressure, the guide valve core overcomes the elastic force of the first elastic element and slides away from the stepped edge, allowing the first flow channel to flow. The first elastic element provides pre-pressure to seal the guide valve core on the stepped edge of the first flow channel, thus preventing the guide valve core near the first valve from directly drawing electrolyte. Instead, the electrolyte needs to apply a certain external force to overcome the elastic force of the first elastic element and push the guide valve core away from the stepped edge to achieve flow in the first flow channel, i.e., to start the electrolyte injection process.

[0008] As a further improvement to the above technical solution, the stepped edge is chamfered, and the guide valve core is fitted with a first sealing ring that abuts against the chamfer. This improves the sealing performance and reliability of the seal between the guide valve core and the first flow channel.

[0009] As a further improvement to the above technical solution, the valve seat is equipped with a flange connecting pipe communicating with the first flow channel, the guide valve core is located between the flange connecting pipe and the valve seat, and the stepped edge is provided on the flange connecting pipe. This facilitates the assembly and connection of the guide valve core.

[0010] As a further improvement to the above technical solution, the first valve includes a valve body mounted on the valve seat. A diaphragm, with its central portion closed at one end of the first flow channel, is mounted on one end of the valve body. The edge of the diaphragm is connected to the valve body, and one end of the second flow channel is connected to the side of the diaphragm. The valve body is equipped with a driving element for driving the central portion of the diaphragm to slide, thereby connecting and disconnecting the first flow channel from the second flow channel. By driving the central portion of the diaphragm to slide away from the end of the first flow channel, the first flow channel can connect with the second flow channel, thus opening the first valve. Conversely, by driving the central portion of the diaphragm to slide back against the end of the first flow channel, the first flow channel is disconnected from the second flow channel, thus closing the first valve. The diaphragm isolates the valve body from the flow channel in the valve seat, reducing the probability of electrolyte entering the valve body and preventing electrolyte from entering the valve body and crystallizing after drying, which would affect normal operation.

[0011] As a further improvement to the above technical solution, the driving component includes a piston rod slidably disposed on the valve body. The piston rod is connected to the middle of the diaphragm. A driving cavity is formed between the side of the piston rod near the diaphragm and the valve body. The piston rod has a driving channel communicating with the driving cavity. The valve body has a driving interface communicating with the driving channel. A second elastic element is disposed between the valve body and the piston rod. The second elastic element is used to push the piston rod to move in the direction of the diaphragm pressing against the first flow channel. When compressed gas is introduced from the driving interface, it can push the piston rod to drive the middle of the diaphragm to slide and open the first flow channel.

[0012] As a further improvement to the above technical solution, the outer peripheral edge of the diaphragm is provided with a boss extending away from the valve body, and the valve seat has a groove for the boss to be inserted. Providing the boss and having it inserted into the groove of the valve seat can prevent the diaphragm from shifting during sliding movement.

[0013] As a further improvement to the above technical solution, a magnetic ring is installed on the piston rod, and a magnetic switch for detecting the position of the magnetic ring is installed on the valve body. The magnetic switch can detect the position of the piston rod, thereby obtaining the opening and closing information of the first valve.

[0014] As a further improvement to the above technical solution, the first valve is installed on the side wall of the valve seat, and the second valve and the first flow channel are both distributed at the top of the valve seat. The second flow channel is vertically arranged, and the valve seat is provided with a fourth flow channel. One end of the fourth flow channel is connected to the second valve, and the other end is inclined downward and communicates with the second flow channel. By rationally designing the flow channels, the electrolyte can flow not only under the action of pressure difference, but also by its own gravity to the lower port of the second flow channel, which can reduce the residue of electrolyte inside the valve seat.

[0015] As a further improvement to the above technical solution, the second valve has the same structure as the first valve. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the internal cross-sectional structure of an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the first valve in an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the second valve when it is opened in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the internal cross-sectional structure of the first valve when it is opened in an embodiment of this utility model.

[0022] 100. Valve seat; 101. Flange connecting pipe; 110. First flow channel; 111. Stepped edge; 112. Chamfer; 120. Second flow channel; 130. Third flow channel; 140. Fourth flow channel; 200. First valve component; 210. Valve body; 211. Upper valve body; 212. Lower valve body; 213. Second sealing ring; 220. Diaphragm; 221. Pressure ring; 222. Rubber gasket; 230. Boss; 240. Groove; 241. Third sealing ring; 251. Piston rod; 252. Drive chamber; 253. Drive channel; 254. Drive interface; 255. Second elastic element; 256. Fourth sealing ring; 257. Fifth sealing ring; 258. Beveled guide ring; 260. Magnetic ring; 300. Second valve component; 400. Guide valve core; 410. First sealing ring; 420. First elastic element. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Reference Figure 1-5 The three-way injection valve includes a valve seat 100, a first valve element 200, a second valve element 300, and a back pressure structure. The valve seat 100 has a first flow channel 110, a second flow channel 120, a third flow channel 130, and a fourth flow channel 140. One end of the first flow channel 110 is located on the top surface of the valve seat 100, and the other end is located on the right side of the valve seat 100. One end of the second flow channel 120 is located on the top surface of the valve seat 100, and the other end is located on the bottom surface of the valve seat 100; the second flow channel 120 is vertically arranged. One end of the third flow channel 130 is located on the left side of the valve seat 100, and the other end is located on the top surface of the valve seat 100. One end of the fourth flow channel 140 communicates with the middle of the second flow channel 120, and the other end is located on the right side of the valve seat 100.

[0028] The first valve element 200 is installed on the right side of the valve seat 100, allowing it to connect to the first flow channel 110 and the fourth flow channel 140. The second valve element 300 is installed on the top surface of the valve seat 100, allowing it to connect to the second flow channel 120 and the third flow channel 130. The internal structures of the first valve element 200 and the second valve element 300 are identical.

[0029] The first valve component 200 includes a valve body 210 and a diaphragm 220. The valve body 210 includes an upper valve body 211 and a lower valve body 212. The upper valve body 211 is sleeved on the top outer side of the lower valve body 212, and a second sealing ring 213 is installed between the upper valve body 211 and the lower valve body 212. The lower valve body 212 is provided with a flange edge, and the lower valve body 212 can be fixedly installed on the right side of the valve seat 100 by means of the flange edge and bolts.

[0030] A diaphragm 220 is installed on the side of the lower valve body 212 near the valve seat 100. The middle part of the diaphragm 220 is a columnar structure, and the outer periphery of the diaphragm 220 is a conical thin sheet structure. The middle part of the diaphragm 220 presses against a port of the first flow channel 110 located on the right side of the valve seat 100, so that the first flow channel 110 is closed.

[0031] A boss 230 is provided on the outer peripheral edge of the diaphragm 220 facing the valve seat 100. The boss 230 extends away from the valve body 210, and a groove 240 adapted to the boss 230 is provided on the valve seat 100. When the valve body 210 is installed, the boss 230 is embedded in the groove 240, thereby restricting the position of the edge portion of the diaphragm 220. A third sealing ring 241 is installed between the boss 230 and the bottom wall of the groove 240.

[0032] Understandably, when the lower valve body 212 is installed on the valve seat 100, the valve seat 100 and the lower valve body 212 together clamp the edge of the diaphragm 220, thus fixing the edge of the diaphragm 220 relative to both the valve seat 100 and the valve body 210. The port of the fourth flow channel 140 that is furthest from the port connected to the second flow channel 120 is located on the side of the diaphragm 220, corresponding to the position of the conical sheet structure.

[0033] A driving component, including a piston rod 251, is also installed inside the valve body 210. The piston rod 251 slides within the valve body 210, with one end fixedly connected to the middle of the diaphragm 220. The side of the piston rod 251 near the diaphragm 220 forms a driving cavity 252 between the side wall of the upper valve body 211 and the end wall of the lower valve body 212. A driving channel 253 is provided in the middle of the piston rod 251, and a driving interface 254 is provided in the upper valve body 211 at the position corresponding to the driving channel 253. The driving interface 254 communicates with the driving channel 253, and the driving channel 253 communicates with the driving cavity 252. A second elastic element 255, which is a second helical spring, is installed between the upper valve body 211 and the piston rod 251. One end of the second helical spring abuts against the inner side of the upper valve body 211, and the other end abuts against the piston rod 251. The elastic force of the second helical spring pushes the piston rod 251 to move towards the valve seat 100, pushing the middle part of the diaphragm 220 to keep it pressed against the port of the first flow channel 110 on the right side of the valve seat 100, so as to ensure that the first flow channel 110 and the fourth flow channel 140 are not connected. The upper valve body 211 has a guide cylinder on its inner side, the top of the piston rod 251 slides in the guide cylinder, the second helical spring is sleeved on the outside of the guide cylinder, and a sealing ring is also provided between the piston rod 251 and the inner side of the guide cylinder.

[0034] The drive interface 254 serves as the drive end of the first valve 200. When compressed gas is connected to the drive interface 254, the compressed gas enters the drive channel 253 from the drive interface 254 and then enters the drive chamber 252. When the drive chamber 252 is filled with compressed gas, the pressure of the compressed gas can be used to push the piston rod 251 to move away from the valve seat 100, thereby pulling the middle part of the diaphragm 220 to slide away from the valve seat 100. The conical thin sheet structure of the diaphragm 220 deforms, allowing the middle part of the diaphragm 220 to move, thereby causing the middle part of the diaphragm 220 to disengage from the port of the first flow channel 110, connecting the first flow channel 110 with the fourth flow channel 140, and further connecting the first flow channel 110 with the second flow channel 120, thus realizing the opening of the first valve 200.

[0035] When the compressed gas supply is stopped, the elastic force of the second elastic element 255 and the elastic restoring force of the diaphragm 220 cause the middle part of the diaphragm 220 to press against the port of the first flow channel 110 again, thereby disconnecting the connection between the first flow channel 110 and the second flow channel 120. Therefore, the first valve 200 can control the opening and closing of the first flow channel 110 and the second flow channel 120.

[0036] Furthermore, a fourth sealing ring 256 is installed between the outer side of the piston rod 251 and the inner wall of the upper valve body 211. A cylinder magnetic ring 260 is also installed on the outer side of the piston rod 251, and a magnetic switch is installed on the outer side of the valve body 210. The magnetic switch is used to sense the position of the magnetic ring 260, thereby determining the position of the piston rod 251, so as to monitor the opening or closing state of the first valve 200. A fifth sealing ring 257 is installed between the outer side of the piston rod 251 and the inner wall of the lower valve body 212. A beveled guide ring 258 is also installed between the outer side of the piston rod 251 and the inner wall of the lower valve body 212.

[0037] Furthermore, a pressure ring 221 is installed at the top of the middle part of the diaphragm 220, and a rubber gasket 222 is sandwiched between the pressure ring 221 and the conical sheet structure of the diaphragm 220.

[0038] Since the second valve 300 has the same structure as the first valve 200, except that the second valve 300 is installed on the top surface of the valve seat 100, and the middle of the diaphragm 220 of the second valve 300 presses against the port at the top of the second flow channel 120, the port of the third flow channel 130 located on the top surface of the valve seat 100 corresponds to the conical thin-plate structure of the diaphragm 220 of the second valve 300. Therefore, the second valve 300 can also control the opening and closing of the second flow channel 120 and the third flow channel 130 by controlling the introduction of compressed gas. The internal structure of the second valve 300 will not be described in detail here.

[0039] In other embodiments, the first valve 200 and the second valve 300 may also be butterfly valves, ball valves or gate valves to control the on / off state between the corresponding flow channels.

[0040] Furthermore, the fourth flow channel 140 is inclined downwards at the end closest to the second flow channel 120. This reasonable flow channel design allows the electrolyte to flow not only under the influence of pressure difference but also by its own gravity to the lower port of the second flow channel 120, thereby reducing electrolyte residue inside the valve seat.

[0041] The back pressure structure includes a guide valve core 400 and a first elastic element 420. A flange connecting pipe 101 is installed on the top of the valve seat 100, and a sixth sealing ring is installed between the flange connecting pipe 101 and the valve seat 100 to ensure the assembly sealing between the flange connecting pipe 101 and the valve seat 100. The flange connecting pipe 101 is located above the first flow channel 110 and is connected to the first flow channel 110. The guide valve core 400 and the first elastic element 420 are both located between the flange connecting pipe 101 and the inner cavity of the first flow channel 110, which facilitates the assembly of the flange connecting pipe 101 and the first flow channel 110.

[0042] The flange connecting pipe 101 has a stepped edge 111 on its inner side. This stepped edge 111 is formed by different inner dimensions on the upper and lower sides of the flange connecting pipe 101, with the upper dimension being smaller and the lower dimension larger. The stepped edge 111 has a chamfer 112, which is a 45-degree angle. In other embodiments, the chamfer 112 can also be any angle between 30 and 60 degrees.

[0043] The top of the guide valve core 400 has an annular groove, and a first sealing ring 410 is embedded in the annular groove. That is, the first sealing ring 410 is sleeved on the outside of the guide valve core 400. The first elastic element 420 is a first helical spring, the top of the first helical spring abuts against the guide valve core 400, and the other end abuts against the top of the valve seat 100. The elastic force of the first helical spring can push the guide valve core 400 to move upward, so that the first sealing ring 410 presses against the chamfer 112, thereby closing the first flow channel 110. When the pressure of the substance connected to the flange connecting pipe 101 reaches the preset pressure, it can push the guide valve core 400 to overcome the elastic force of the first elastic element 420 and move downward, so that the flange connecting pipe 101 connects to the first flow channel 110, and the substance connected from the flange connecting pipe 101 can enter the first flow channel 110 through the gap between the guide valve core 400 and the chamfer 112.

[0044] In other embodiments, an electric gate and a pressure sensor may be provided on the guide valve core 400. When the pressure sensor detects that the pressure of the substance flowing into the first flow channel 110 reaches the preset pressure, the electric gate is controlled to open to connect the flange connecting pipe 101 and the first flow channel 110, that is, to open the first flow channel 110.

[0045] The state of the three-way injection valve in this embodiment is as follows:

[0046] 1. In the initial state, the first valve 200 and the second valve 300 drive the piston rod 251 to press down under the action of their respective second elastic elements 255, causing the middle part of the diaphragm 220 to abut against the corresponding flow channel port. At this time, both the first valve 200 and the second valve 300 remain in the closed state.

[0047] 2. Compressed gas is introduced into the control port (drive interface 254) of the second valve 300. The compressed gas drives the piston rod 251 to move upward, causing the middle of the diaphragm 220 to lift, thus opening the valve. At this time, the second valve 300 is in the open state, the gas channel is connected, and the first valve 200 is in the closed state. The vacuum pump is connected to the vacuum inlet (the left port of the third flow channel 130) through a pipe, and the liquid outlet (the bottom end of the second flow channel 120) is connected to the battery chamber. The vacuum pump evacuates the battery. After the evacuation is completed, the control port of the second valve 300 stops supplying compressed gas. Under the action of the spring, the second valve 300 causes the diaphragm 220 to re-abut against the flow channel port, thus closing the valve.

[0048] 3. After holding the pressure for a period of time, the pipes in the battery cavity and the outlet port maintain a vacuum environment. Compressed gas is introduced into the first valve 200, and the piston rod 251 of the first valve 200 moves to the right, causing the middle part of the diaphragm 220 to move to the right, thus opening the valve. At this time, the liquid channel in the valve seat is connected. Due to the effect of the back pressure structure, the vacuum in the valve seat 100 cannot directly remove the electrolyte above the back pressure structure. The electrolyte needs to be pushed open by the guide valve core 400 of the back pressure structure under the action of external force. The guide valve core 400 moves downward, and the first elastic element 420 is compressed, so that the electrolyte can flow out of the outlet port along the liquid path. After the liquid injection is completed, the control port of the first valve 200 stops the introduction of compressed gas, and the first valve 200 closes the valve under the action of the second elastic element 255.

[0049] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A three-way injection valve, characterized in that, include: The valve seat is provided with a first flow channel, a second flow channel, and a third flow channel; A first valve is installed on the valve seat, and the first valve is used to control the connection and disconnection between the first flow channel and the second flow channel; A second valve is installed on the valve seat, and the second valve is used to control the connection and disconnection between the second flow channel and the third flow channel; A back pressure structure is installed in the first flow channel. The back pressure structure is used to close the first flow channel and open the first flow channel when the substance flowing towards the first valve in the first flow channel reaches a preset pressure.

2. The three-way injection valve according to claim 1, characterized in that: The back pressure structure includes a guide valve core and a first elastic element disposed in the first flow channel. The first flow channel is provided with a stepped edge. The first elastic element is used to push the guide valve core to slide away from the first valve and abut against the stepped edge, so that the guide valve core closes the first flow channel. When the substance flowing towards the first valve in the first flow channel reaches a preset pressure, the guide valve core overcomes the elastic force of the first elastic element and slides away from the stepped edge, allowing the first flow channel to flow.

3. The three-way injection valve according to claim 2, characterized in that: The stepped edge is chamfered, and the guide valve core is fitted with a first sealing ring that abuts against the chamfer.

4. The three-way injection valve according to claim 2, characterized in that: The valve seat is equipped with a flange connecting pipe that communicates with the first flow channel, the guide valve core is located between the flange connecting pipe and the valve seat, and the stepped side is provided on the flange connecting pipe.

5. A three-way injection valve according to claim 1, characterized in that: The first valve includes a valve body mounted on the valve seat, a diaphragm that is centrally closed at one end of the first flow channel is mounted on one end of the valve body, the edge of the diaphragm is connected to the valve body, one end of the second flow channel is connected to the side of the diaphragm, and the valve body is equipped with a drive for driving the central part of the diaphragm to slide, thereby connecting and disconnecting the first flow channel from the second flow channel.

6. A three-way injection valve according to claim 5, characterized in that: The driving component includes a piston rod slidably disposed on the valve body. The piston rod is connected to the middle of the diaphragm. A driving cavity is formed between the side of the piston rod near the diaphragm and the valve body. The piston rod has a driving channel communicating with the driving cavity. The valve body has a driving interface communicating with the driving channel. A second elastic element is disposed between the valve body and the piston rod. The second elastic element is used to push the piston rod to move in the direction of the diaphragm pressing against the first flow channel. When compressed gas is introduced from the driving interface, it can push the piston rod to drive the middle of the diaphragm to slide and open the first flow channel.

7. A three-way injection valve according to claim 6, characterized in that: The outer periphery of the diaphragm is provided with a boss extending away from the valve body, and the valve seat is provided with a groove for the boss to be inserted.

8. A three-way injection valve according to claim 6, characterized in that: The piston rod is equipped with a magnetic ring, and the valve body is equipped with a magnetic switch for detecting the position of the magnetic ring.

9. A three-way injection valve according to claim 1, characterized in that: The first valve is installed on the side wall of the valve seat. The second valve and the first flow channel are both located at the top of the valve seat. The second flow channel is vertically arranged. The valve seat is provided with a fourth flow channel. One end of the fourth flow channel is connected to the second valve, and the other end is inclined downward and communicates with the second flow channel.

10. A three-way injection valve according to claim 1, characterized in that: The second valve has the same structure as the first valve.

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