Differential pressure liquid injection valve

Abstract

The utility model discloses a differential pressure liquid injection valve which comprises a valve body, a valve seat, a valve element and a valve body. A valve body inner cavity penetrating through the top end and the bottom end of the valve body is formed in the valve body and comprises a first part, a second part and a third part which are sequentially communicated from top to bottom. A valve seat inner cavity penetrating through the top end of the valve seat is formed in the valve seat, the valve seat inner cavity is communicated with the third part, and an air outlet communicated with the valve seat inner cavity is formed in the bottom end of the valve seat; the valve element is arranged in the first part, the second part and the third part, the top end of the valve element extends out of the first part, the valve element can move up and down relative to the valve body, a ventilation cavity is formed in the valve element, an air inlet communicated with the top end of the ventilation cavity is formed in the top end of the valve element, and a through hole communicated with the bottom end of the ventilation cavity is formed in the outer wall of the valve element. The through hole is communicated with the second part; the valve is arranged on the periphery of the valve element in a sleeving mode and can synchronously move along with the valve element. According to the utility model, the effect of infiltrating the battery cell by the electrolyte is improved, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to a one-way valve, in particular to a differential pressure injection valve. Background Art

[0002] At present, in the process of lithium-ion battery injection, after the battery is injected at the injection station, the battery is first installed at one end of the fixture cup, and then the fixture cup and the battery are transferred to the static station, and then the pressurization-vacuuming mechanism at the static station is used to pressurize and vacuum the interior of the battery through the end of the fixture cup away from the battery and the interior of the fixture cup to achieve the positive and negative pressure breathing action of the battery to ensure that the electrolyte completely infiltrates the battery cell. However, in the process of transferring the fixture cup and the battery from the injection station to the static station, since the end of the fixture cup away from the battery is usually in an open state, it is impossible to maintain pressure inside the battery, which reduces the effect of the electrolyte infiltrating the battery cell, thereby reducing the quality of the product.

[0003] Therefore, a pressure differential injection valve is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a pressure differential injection valve, which can maintain the pressure inside the battery during the process of transferring the fixture cup and the battery from the injection station to the static station, thereby improving the effect of the electrolyte infiltrating the battery cell and improving the quality of the product.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A differential pressure injection valve comprises a valve body, a valve seat, a valve core and a valve; the valve body is provided with a valve body cavity penetrating the top and bottom ends of the valve body, the valve body cavity comprises a first part, a second part and a third part which are sequentially connected from top to bottom, the valve body is sleeved on the outer periphery of the valve seat through the third part and a first sealing structure is used to seal the two; the valve seat is provided with a valve seat cavity penetrating the top end of the valve seat, the valve seat cavity is connected with the third part, and an air outlet which is connected with the valve seat cavity is provided at the bottom end of the valve seat; the valve core is arranged in the first part, the second part and the third part and the top end of the valve core extends out of the first part, the valve core can move up and down relative to the valve body, and a second sealing structure is used to seal the outer wall of the valve core and the inner wall of the first part. The sealing structure is used to achieve sealing, the outer periphery of the valve core is sleeved with a first elastic member, the first end of the first elastic member is connected to the outer wall of the valve core, the second end of the first elastic member is connected to the inner wall of the second part, a ventilation cavity is provided in the valve core, the top end of the valve core is provided with an air inlet hole connected to the top end of the ventilation cavity, the outer wall of the valve core is provided with a through hole connected to the bottom end of the ventilation cavity, and the through hole is connected to the second part; the valve sleeve is arranged on the outer periphery of the valve core, the valve can move synchronously with the valve core, the top end of the valve is abutted against the top wall of the third part, the bottom end of the valve extends into the inner cavity of the valve seat and has a valve gap with the inner wall of the inner cavity of the valve seat, and the valve gap is respectively connected to the third part and the inner cavity of the valve seat.

[0007] As a preferred technical solution, the outer wall of the bottom end of the valve seat is formed with an annular first valve seat flange, the outer diameter of the first valve seat flange is larger than the inner diameter of the third part, the first valve seat flange is abutted against the bottom end of the valve body, and the first valve seat flange is provided with a plurality of mounting holes passing through the top and bottom ends of the first valve seat flange, and the plurality of mounting holes are distributed in an annular manner around the valve body.

[0008] As a preferred technical solution, the first sealing structure includes a first static sealing ring, the outer wall of the valve seat is formed with an annular second valve seat flange, the second valve seat flange is connected to the top end of the first valve seat flange, the opening of the third part is provided with a bevel, the first static sealing ring is arranged between the bevel and the second valve seat flange and is sleeved on the outer periphery of the second valve seat flange.

[0009] As a preferred technical solution, the second sealing structure includes a second static sealing ring and a dynamic sealing ring, the inner wall of the first part is provided with a first valve body groove, the second static sealing ring is arranged in the first valve body groove and is sleeved on the outer periphery of the valve core, the inner wall of the first part is provided with a second valve body groove, the second valve body groove is located below the first valve body groove, the dynamic sealing ring is arranged in the second valve body groove and is sleeved on the outer periphery of the valve core, the top end of the dynamic sealing ring is abutted against the top wall of the second valve body groove, and a sealing ring gap is provided between the bottom end of the dynamic sealing ring and the bottom wall of the second valve body groove, and the dynamic sealing ring can move synchronously with the valve core.

[0010] As a preferred technical solution, the second static sealing ring is an O-ring, and the dynamic sealing ring is a Y-ring.

[0011] As a preferred technical solution, the inner wall of the valve seat inner cavity is provided with a valve seat groove, and the valve gap is provided between the bottom end of the valve and the bottom of the valve seat groove.

[0012] As a preferred technical solution, the outer wall of the valve core has a step, and the step is located in the first part. The inner wall of the second part forms an annular boss, and the boss is arranged around the outer periphery of the valve core and has a boss gap with the outer wall of the valve core. The first end of the first elastic member is connected to the step, and the second end of the first elastic member is connected to the boss.

[0013] As a preferred technical solution, a second elastic member is provided in the inner cavity of the valve seat, a first end of the second elastic member is connected to the bottom end of the valve, and a second end of the second elastic member is connected to the bottom wall of the inner cavity of the valve seat.

[0014] As a preferred technical solution, the inner wall of the third part is provided with a valve body recess, and the outer wall of the valve seat is formed with an annular third valve seat flange, and the third valve seat flange is engaged with the valve body recess.

[0015] As a preferred technical solution, a limiting protrusion is formed on the outer wall of the valve core, the top of the valve abuts against the limiting protrusion, a limiting member is sleeved on the outer periphery of the bottom end of the valve core, a valve recess is provided at the bottom end of the valve, the limiting member is partially located in the valve recess, and the top of the limiting member abuts against the bottom wall of the valve recess.

[0016] The beneficial effect of the utility model is that the pressure differential liquid injection valve of the utility model is installed at the end of the fixture cup away from the battery during actual application. In the process of transferring the fixture cup and the battery from the liquid injection station to the static station, the valve core is not subjected to external force. At this time, the valve core and the valve are kept in the initial position, that is, the top of the valve is against the valve body protrusion of the top wall of the third part, so that the second part and the third part are not connected, and the pressure differential liquid injection valve is closed. In this way, a sealed environment can be formed inside the fixture cup, thereby maintaining the pressure inside the battery, improving the effect of electrolyte infiltrating the battery cell, and improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a pressure differential liquid injection valve provided by an embodiment of the utility model at a first angle;

[0019] Figure 2 yes Figure 1 A schematic structural diagram of a second angle of the differential pressure injection valve shown;

[0020] Figure 3 yes Figure 1 A cross-sectional schematic diagram of the differential pressure injection valve shown;

[0021] Figure 4 yes Figure 1 An exploded schematic diagram of the differential pressure injection valve shown;

[0022] Figure 5 yes Figure 1 A schematic cross-sectional view of the valve body of the differential pressure injection valve is shown. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0024] Please refer to Figures 1 to 5A differential pressure injection valve provided in one embodiment of the utility model includes a valve body 10 , a valve seat 20 , a valve core 30 and a valve 40 .

[0025] The inner cavity of the valve body 10 extends along the axis thereof, and the inner cavity of the valve body 10 passes through the top and bottom ends of the valve body 10. The inner cavity of the valve body includes a first portion 11, a second portion 12, and a third portion 13 which are sequentially connected from top to bottom. The inner diameter of the second portion 12 is smaller than the inner diameters of the first portion 11 and the third portion 13, and the inner diameter of the first portion 11 is smaller than the inner diameter of the third portion 13. The valve body 10 is sleeved on the outer periphery of the valve seat 20 through the third portion 13, and the two are sealed by a first sealing structure to prevent air leakage.

[0026] The valve seat 20 is provided with a valve seat inner cavity 22 extending along its axis, the valve seat inner cavity 22 passes through the top of the valve seat 20, and the valve seat inner cavity 22 is communicated with the third part 13. The bottom end of the valve seat 20 is provided with an air outlet 23 communicated with the valve seat inner cavity 22. The outer wall of the bottom end of the valve seat 20 is formed with an annular first valve seat flange 21, the outer diameter of the first valve seat flange 21 is larger than the inner diameter of the third part 13 and the outer diameter of the valve body 10, and the first valve seat flange 21 is against the bottom end of the valve body 10. The first valve seat flange 21 is provided with a plurality of mounting holes 211 passing through the top and bottom ends of the first valve seat flange 21, and the plurality of mounting holes 211 are distributed in an annular interval around the valve body 10, and the number of mounting holes 211 can be set according to actual conditions. In actual application, the first valve seat flange 21 is installed at the end of the fixture cup away from the battery through a plurality of mounting holes 211, screws, etc., and the air outlet 23 is used to communicate with the inside of the fixture cup.

[0027] In this embodiment, the first sealing structure includes a first static sealing ring 51. An annular second valve seat flange 24 is formed on the outer wall of the valve seat 20, and the second valve seat flange 24 is connected to the top of the first valve seat flange 21. An inclined surface 131 is provided at the opening of the third portion 13, and the first static sealing ring 51 is arranged between the inclined surface 131 and the second valve seat flange 24 and sleeved on the outer periphery of the second valve seat flange 24.

[0028] The inner wall of the third portion 13 is provided with a valve body recess 132 , and the outer wall of the valve seat 20 is formed with an annular third valve seat flange 25 , which is engaged with the valve body recess 132 .

[0029] The valve core 30 is T-shaped, and is disposed in the first portion 11, the second portion 12, and the third portion 13, with the top end of the valve core 30 extending out of the first portion 11. The valve core 30 can move up and down relative to the valve body 10.

[0030] The outer wall of the valve core 30 and the inner wall of the first part 11 are sealed by a second sealing structure to prevent air leakage. In this embodiment, the second sealing structure includes a second static sealing ring 52 and a dynamic sealing ring 53. The inner wall of the first part 11 is provided with a first valve body groove 111 and a second valve body groove 112, and the second valve body groove 112 is located below the first valve body groove 111. The second static sealing ring 52 is arranged in the first valve body groove 111 and is sleeved on the outer periphery of the valve core 30. The dynamic sealing ring 53 is arranged in the second valve body groove 112 and is sleeved on the outer periphery of the valve core 30. The top end of the dynamic sealing ring 53 is against the top wall of the second valve body groove 112, and there is a sealing ring gap between the bottom end of the dynamic sealing ring 53 and the bottom wall of the second valve body groove 112. The dynamic sealing ring 53 can move synchronously with the valve core 30.

[0031] The first static sealing ring 51 and the second static sealing ring 52 are both O-type sealing rings, and the dynamic sealing ring 53 is a Y-type sealing ring.

[0032] The outer periphery of the valve core 30 is sleeved with a first elastic member 61, a first end of the first elastic member 61 is connected to the outer wall of the valve core 30, and a second end of the first elastic member 61 is connected to the inner wall of the second portion 12. The first elastic member 61 is preferably a spring.

[0033] In this embodiment, the outer wall of the valve core 30 has a step 36, and the step 36 is located in the first part 11. The inner wall of the second part 12 is formed with an annular boss 121, which is arranged around the outer periphery of the valve core 30 and has a boss gap with the outer wall of the valve core 30. The first end of the first elastic member 61 is connected to the step 36, and the second end of the first elastic member 61 is connected to the boss 121.

[0034] The valve core 30 is provided with a ventilation cavity 321 extending along its axial direction, the top of the valve core 30 is provided with an air inlet 322 connected to the top of the ventilation cavity 321, and the outer wall of the valve core 30 is provided with a through hole 33 connected to the bottom of the ventilation cavity 321, and the through hole 33 is connected to the second part 12. The inner diameter of the air inlet 322 is larger than the inner diameter of the ventilation cavity 321. In this embodiment, there are two through holes 33, and the two through holes 33 are arranged opposite to each other. It can be understood that the number of through holes 33 can be set according to actual conditions. The top of the valve core 30 is used to connect with the pressurization-vacuuming mechanism of the static station. In actual application, the pressurization-vacuuming mechanism can realize the pressurization and vacuuming operation of the interior of the battery through the pressure differential injection valve and the interior of the fixture sleeve cup of the utility model, thereby realizing the positive pressure breathing action and negative pressure breathing action of the battery.

[0035] The valve 40 is sleeved on the outer periphery of the valve core 30, and the valve 40 can move synchronously with the valve core 30. The top of the valve 40 abuts against the top wall of the third part 13, and the bottom of the valve 40 extends into the valve seat inner cavity 22. There is a valve gap between the bottom of the valve 40 and the inner wall of the valve seat inner cavity 22. The valve gap is connected with the third part 13 and the valve seat inner cavity 22.

[0036] In this embodiment, a valve seat groove 22 a is formed on the inner wall of the valve seat inner cavity 22 , and the above-mentioned valve gap is provided between the bottom end of the valve 40 and the bottom of the valve seat groove 22 a .

[0037] In this embodiment, the top wall of the third portion 13 is formed with an annular valve body protrusion 133, which is arranged around the second portion 12. The valve body protrusion 133 abuts against the top of the valve 40 to achieve sealing to prevent air leakage.

[0038] A second elastic member 62 is disposed in the valve seat inner cavity 22, a first end of the second elastic member 62 is connected to the bottom end of the valve 40, and a second end of the second elastic member 62 is connected to the bottom wall of the valve seat inner cavity 22. The second elastic member 62 is preferably a spring.

[0039] In this embodiment, the bottom wall of the valve seat inner cavity 22 is formed with an annular valve seat protrusion 26, which is arranged around the air outlet 23, and the inside of the valve seat protrusion 26 is respectively connected with the air outlet 23 and the valve seat inner cavity 22. The second elastic member 62 is sleeved on the outer periphery of the valve seat protrusion 26. The bottom end of the valve 40 is provided with a valve recess 41, and the first end of the second elastic member 62 is connected to the bottom wall of the valve recess 41.

[0040] The outer wall of the valve core 30 forms a limiting protrusion 34, the top of the valve 40 abuts against the limiting protrusion 34, and the outer periphery of the bottom end of the valve core 30 is sleeved with a limiting member 35, the limiting member 35 is partially located in the valve recess 41, and the top of the limiting member 35 abuts against the bottom wall of the valve recess 41. The limiting protrusion 34 and the limiting member 35 have a limiting effect on the valve 40. The limiting member 35 is preferably a nut.

[0041] Through the above structure, in actual application, the first valve seat flange 211 is installed to the end of the fixture cup away from the battery. In the process of transferring the fixture cup and the battery from the injection station to the static station, the valve core 30 is not subjected to external force. Under the action of the first elastic member 61 and the second elastic member 62, the valve core 30, the valve 40, and the dynamic sealing ring 53 are all kept in the initial position. Figure 1 , Figure 2 , Figure 3In the position shown, the top of the dynamic sealing ring 53 abuts against the top wall of the second valve body groove 112, and the top of the valve 40 abuts against the valve body protrusion 133 on the top wall of the third part 13, so that the second part 12 and the third part 13 are not connected, and the pressure differential injection valve is closed, so that a sealed environment can be formed inside the fixture cup, thereby maintaining the pressure inside the battery. After the battery is transferred to the static station, the pressurizing-vacuuming mechanism of the static station is connected to the top of the valve core 30. When the internal part of the battery is pressurized, the valve core 30 is first pressed downward by the pressurizing-vacuuming mechanism to move the valve core 30 downward, the first elastic member 61 and the second elastic member 62 are compressed, and the dynamic sealing ring 53 moves downward under the drive of the valve core 30. The bottom end of the dynamic sealing ring 53 will abut against the bottom wall of the second valve body groove 112, and the valve 40 will move downward under the drive of the valve core 30. The valve 40 will separate from the top wall of the third part 13, so that the second part 12 and the third part 13 are connected. At this time, the air inlet 322, the ventilation cavity 321, the through hole 33, the second part 12, the third part 13, the valve gap, the valve seat cavity 22, and the air outlet 23 are connected in sequence, so that the pressure differential injection valve is opened, and then the internal part of the battery can be pressurized through the pressure differential injection valve and the fixture cup by the pressurizing-vacuuming mechanism. The steps of evacuating the interior of the battery are the same as the steps of pressurizing the interior of the battery, and will not be repeated here.

[0042] The pressure differential injection valve of the utility model is installed at the end of the fixture cup away from the battery in actual application. In the process of transferring the fixture cup and the battery from the injection station to the static station, the valve core 30 is not subjected to external force, so the pressure differential injection valve is closed, so that a sealed environment is formed inside the fixture cup, so that the pressure inside the battery can be maintained, the effect of electrolyte infiltrating the battery cell is improved, and the quality of the product is improved. After the fixture cup and the battery are transferred to the static station, the top of the valve core 30 is connected through the pressurization-vacuuming mechanism of the static station, and the valve core 30 is pressed down by the pressurization-vacuuming mechanism, so that the pressure differential injection valve can be opened. In this way, the pressure differential injection valve and the fixture cup can be pressurized and vacuumed through the pressure differential injection valve and the fixture cup, so that the positive and negative pressure breathing action of the battery can be achieved to ensure that the electrolyte completely infiltrates the battery cell.

[0043] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A differential pressure injection valve, characterized in that: Including valve body, valve seat, valve core and valve; The valve body is provided with a valve body cavity penetrating the top and bottom ends of the valve body, the valve body cavity includes a first part, a second part and a third part which are connected in sequence from top to bottom, the valve body is sleeved on the outer periphery of the valve seat through the third part, and the first sealing structure is used to achieve sealing between the two; The valve seat is provided with a valve seat inner cavity penetrating through the top end of the valve seat, the valve seat inner cavity is communicated with the third part, and the bottom end of the valve seat is provided with an air outlet hole communicated with the valve seat inner cavity; The valve core is arranged in the first part, the second part and the third part, and the top end of the valve core extends out from the first part, the valve core can move up and down relative to the valve body, and the outer wall of the valve core and the inner wall of the first part are sealed by a second sealing structure, a first elastic member is sleeved on the outer periphery of the valve core, a first end of the first elastic member is connected to the outer wall of the valve core, and a second end of the first elastic member is connected to the inner wall of the second part, a ventilation cavity is arranged in the valve core, an air inlet hole communicating with the top end of the ventilation cavity is arranged on the top end of the valve core, a through hole communicating with the bottom end of the ventilation cavity is arranged on the outer wall of the valve core, and the through hole is communicated with the second part; The valve sleeve is arranged on the outer periphery of the valve core, and the valve can move synchronously with the valve core. The top end of the valve abuts against the top wall of the third part, and the bottom end of the valve extends into the inner cavity of the valve seat and has a valve gap with the inner wall of the inner cavity of the valve seat, and the valve gap is respectively connected with the third part and the inner cavity of the valve seat.

2. The differential pressure injection valve according to claim 1, characterized in that: The outer wall of the bottom end of the valve seat is formed with an annular first valve seat flange, the outer diameter of the first valve seat flange is larger than the inner diameter of the third part, the first valve seat flange is abutted against the bottom end of the valve body, and the first valve seat flange is provided with a plurality of mounting holes penetrating the top and bottom ends of the first valve seat flange, and the plurality of mounting holes are distributed in an annular manner around the valve body.

3. The differential pressure injection valve according to claim 2, characterized in that: The first sealing structure includes a first static sealing ring, the outer wall of the valve seat is formed with an annular second valve seat flange, the second valve seat flange is connected to the top end of the first valve seat flange, the opening of the third part is provided with a slope, the first static sealing ring is arranged between the slope and the second valve seat flange and is sleeved on the outer periphery of the second valve seat flange.

4. The differential pressure injection valve according to claim 1, characterized in that: The second sealing structure includes a second static sealing ring and a dynamic sealing ring. The inner wall of the first part is provided with a first valve body groove. The second static sealing ring is arranged in the first valve body groove and is sleeved on the outer periphery of the valve core. The inner wall of the first part is provided with a second valve body groove. The second valve body groove is located below the first valve body groove. The dynamic sealing ring is arranged in the second valve body groove and is sleeved on the outer periphery of the valve core. The top end of the dynamic sealing ring is abutted against the top wall of the second valve body groove. A sealing ring gap is provided between the bottom end of the dynamic sealing ring and the bottom wall of the second valve body groove. The dynamic sealing ring can move synchronously with the valve core.

5. The differential pressure injection valve according to claim 4, characterized in that: The second static sealing ring is an O-shaped sealing ring, and the dynamic sealing ring is a Y-shaped sealing ring.

6. The differential pressure injection valve according to claim 1, characterized in that: The inner wall of the valve seat inner cavity is provided with a valve seat groove, and the valve gap is provided between the bottom end of the valve and the bottom of the valve seat groove.

7. The differential pressure injection valve according to claim 1, characterized in that: The outer wall of the valve core has a step, and the step is located in the first part. The inner wall of the second part forms an annular boss, and the boss is arranged around the outer periphery of the valve core and has a boss gap with the outer wall of the valve core. The first end of the first elastic member is connected to the step, and the second end of the first elastic member is connected to the boss.

8. The differential pressure injection valve according to claim 1, characterized in that: A second elastic member is disposed in the inner cavity of the valve seat, a first end of the second elastic member is connected to the bottom end of the valve, and a second end of the second elastic member is connected to the bottom wall of the inner cavity of the valve seat.

9. The differential pressure injection valve according to claim 1, characterized in that: The inner wall of the third part is provided with a valve body recess, and the outer wall of the valve seat is formed with an annular third valve seat flange, and the third valve seat flange is engaged with the valve body recess.

10. The differential pressure injection valve according to claim 1, characterized in that: The outer wall of the valve core forms a limiting protrusion, the top of the valve abuts against the limiting protrusion, the outer periphery of the bottom end of the valve core is sleeved with a limiting member, the bottom end of the valve is provided with a valve recess, the limiting member is partially located in the valve recess, and the top of the limiting member abuts against the bottom wall of the valve recess.

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