Pressure control system and pressure control valve

Abstract

The utility model discloses a pressure control system and a pressure control valve, and relates to the technical field of secondary battery production. The pressure control system may include: a vacuum pump; a positive pressure gas source; the formation gas path is connected with an external secondary battery; a pressure control valve; the pressure control valve comprises a valve body, a first channel arranged on the valve body and connected with a vacuum pump, a second channel connected with a formation gas circuit, a third channel connected with a positive pressure gas source, a pilot cavity arranged in the valve body, a valve element and a sealing structure connected with the valve element. The sealing structure comprises a first sealing piece used for regulating and controlling the opening degree of the first channel and a second sealing piece used for regulating and controlling the opening degree of the third channel, and the width of a first cavity area, used for containing the second sealing piece, in the valve body is consistent with that of a second cavity area in the valve body. According to the pressure control system, through a simple gas circuit design, formation processes of different secondary batteries and different gas pressure requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary battery production, in particular to a pressure control system and a pressure control valve. Background Art

[0002] For the formation process of secondary batteries, the pressure control system is generally required to provide a vacuum environment and a positive pressure environment. The vacuum environment is mainly to timely remove the large amount of gas generated during the charging and discharging process of the secondary battery. The positive pressure environment is mainly required to break the vacuum after the formation process is completed and regularly purge and clean the battery formation gas path.

[0003] At present, in order to meet the requirements of the formation process for vacuum environment and positive pressure environment, in addition to the vacuum control gas circuit, the pressure control system used in the formation process will design an independent gas circuit to connect the vacuum breaking on-off valve and the on-off valve for pipeline cleaning, and use the independent vacuum breaking on-off valve to break the vacuum of the gas circuit of the formation process, and use the on-off valve for pipeline cleaning to clean the gas circuit of the formation process. Specifically, Figure 1 The partial structural diagram of the pressure control system used in the formation process of the secondary battery in the prior art is shown. In the prior art, in addition to the equipment necessary for adjusting the vacuum degree: vacuum pump 10, formation gas path 30, pressure control valve 40, vacuum on-off valve 50, pressure sensor 70 and electrolyte filter 80, the pressure control system also includes a vacuum breaking on-off valve 91 and a pipeline cleaning on-off valve 92 in the existing pressure control system, wherein the vacuum breaking on-off valve 91 is used to break the vacuum environment of the formation gas path 30, and the pipeline cleaning on-off valve 92 is used to provide positive pressure for the formation gas path 30 to clean the formation gas path 30. Specifically, the pressure control valve 40 connects the vacuum pump 10 with the formation gas path 30 by conducting the first channel (the first channel is connected to the vacuum pump 10) and the second channel (the second channel is connected to the formation gas path 30), so that the formation gas path 30 has a vacuum environment. However, the existing pressure control valve used in the existing pressure control system can only provide a vacuum environment for the formation gas path 30.

[0004] from Figure 1 It can be seen that the existing pressure control system of the chemical formation process requires the design of a relatively complex gas circuit, and the on-off valve for breaking the vacuum and the on-off valve for pipeline cleaning are independently designed in the pressure control system. In addition, the on-off valve for breaking the vacuum and the on-off valve for pipeline cleaning in the existing pressure control system of the chemical formation process can only realize the on-off of a fixed positive pressure value, which cannot meet the requirements of different processes and different air pressures. Utility Model Content

[0005] In view of this, an embodiment of the utility model provides a pressure control system and a pressure control valve. The pressure control system provides a vacuum degree and positive pressure that can be adjusted according to requirements for the formation process by designing a pressure control valve, thereby meeting different secondary battery formation processes and different air pressure requirements through a simple gas circuit design.

[0006] To achieve the above objectives, in a first aspect, an embodiment of the present utility model provides a pressure control system, comprising:

[0007] Vacuum pump;

[0008] Positive pressure gas source;

[0009] A formation gas circuit connected to an external secondary battery;

[0010] Pressure control valve;

[0011] The pressure control valve comprises a valve body, a first channel connected to the vacuum pump, a second channel connected to the formation gas path and a third channel connected to the positive pressure gas source, a pilot chamber, a valve core and a sealing structure connected to the valve core arranged in the valve body, wherein:

[0012] The sealing structure includes a first sealing member for regulating the opening of the first channel and a second sealing member for regulating the opening of the third channel, wherein the width of a first cavity area in the valve body for accommodating the second sealing member is consistent with the width of a second cavity area in the valve body.

[0013] Optionally, the second cavity area is located between the first channel and the third channel and is adjacent to the sealing end surface of the second sealing member.

[0014] Optionally,

[0015] The pressure control valve drives the valve core to drive the first sealing member and the second sealing member to move axially through the pressure change in the pilot chamber, thereby regulating the opening of the first channel and the third channel.

[0016] Optionally, the third channel includes a groove arranged near the side wall of the inner cavity of the valve body, wherein:

[0017] In the case where the second seal seals the third channel,

[0018] The sealing end surface of the second sealing member extends to a region of the third passage (44) covering a portion of the groove.

[0019] Optionally, the sealing structure further comprises: a valve stem movably connected to the valve core;

[0020] The second sealing member includes: a second elastic component and a second sealing cover;

[0021] A sealing lip is provided at the intersection of the third channel and the inner cavity side wall of the valve body; wherein,

[0022] The second sealing cover is nested on the valve stem;

[0023] The second elastic component cooperates with the sealing lip to elastically press and assemble the second sealing cover between the side wall of the valve stem, the side wall of the cavity in the valve body and the sealing lip;

[0024] The valve stem overcomes the elastic force of the second elastic component and drives the second sealing cover to reciprocate in the first cavity area.

[0025] Optionally, the pressure control system further comprises: a vacuum on-off valve, wherein:

[0026] The air inlet end of the vacuum on-off valve is connected to the second channel, and the air outlet end of the vacuum on-off valve is connected to the formation gas path.

[0027] Optionally, the pressure control system further comprises: a control platform and a pressure sensor for detecting the pressure of the formation gas path, wherein:

[0028] The pressure sensor is signal-connected to the control platform, and is used to transmit a pressure signal corresponding to the pressure to the control platform;

[0029] The control platform is used to regulate the pressure in the pilot chamber according to the pressure signal.

[0030] Optionally, the control platform comprises: an outer loop controller and an inner loop controller arranged in cascade in the pressure control valve, wherein:

[0031] The outer loop controller transmits an output signal to the inner loop controller in response to the pressure signal sent by the pressure sensor;

[0032] The inner loop controller acts on the pilot chamber and is used to adjust the pressure in the pilot chamber by combining the output signal of the outer loop controller and the pressure feedback in the pilot chamber.

[0033] Optionally, the pressure control valve is communicatively connected to an external main station for receiving working information related to the formation gas circuit sent by the external main station.

[0034] Optionally, the pressure control valve is used to adjust the pressure of the formation gas circuit within a range of -1 to 6 bar.

[0035] In a second aspect, an embodiment of the utility model provides a pressure control valve, comprising: a valve body, a first channel connected to the vacuum pump, a second channel connected to the formation gas path, and a third channel connected to the positive pressure gas source, a pilot chamber, a valve core, and a sealing structure connected to the valve core arranged in the valve body, wherein:

[0036] The sealing structure includes a first sealing member for adjusting the opening of the first channel and a second sealing member for adjusting the opening of the third channel, wherein:

[0037] The width of the first cavity region in the valve body for accommodating the second sealing member is consistent with the width of the second cavity region in the valve body.

[0038] Optionally, the second cavity area is located between the first channel and the third channel and is adjacent to the sealing end surface of the second sealing member.

[0039] Optionally, the pressure control valve drives the valve core to drive the first sealing member and the second sealing member to move axially through the pressure change in the pilot chamber, thereby regulating the opening of the first channel and the third channel.

[0040] Optionally, in the above pressure control valve, the third channel includes a groove arranged near the inner wall of the valve body, wherein:

[0041] In the case where the second seal seals the third channel,

[0042] The sealing end surface of the second sealing member extends to a region of the third passage and covers a portion of the groove.

[0043] Optionally, the pressure control valve is further provided with a cascaded outer loop controller and an inner loop controller, wherein:

[0044] In the case where the pressure control valve is applied to a pressure control system, the outer loop controller transmits an output signal to the inner loop controller in response to a pressure signal sent by a pressure sensor in the pressure control system;

[0045] The inner loop controller acts on the pilot chamber, and is used to adjust the pressure in the pilot chamber by combining the output signal of the outer loop controller and the pressure feedback in the pilot chamber.

[0046] One embodiment of the above utility model has the following advantages or beneficial effects: the pressure control valve in the pressure control system provided by the utility model has the same width as the second cavity area in the valve body for accommodating the second sealing member, even if the third channel of the pressure control valve is connected to the positive pressure gas source, when the formation gas path is in a negative pressure environment, the second sealing member can also seal the third channel to avoid leakage of the third channel, so as to ensure the vacuum degree of the formation gas path. In addition, when the third channel is connected to the second channel, the positive pressure gas source can provide positive pressure for the formation gas path, meet the requirements of vacuum breaking and positive pressure cleaning of the formation gas path, so that the pressure control system can omit the vacuum breaking on-off valve and the pipeline cleaning on-off valve. Therefore, the pressure control system provided by the embodiment of the utility model is realized by designing a pressure control valve to provide vacuum degree and positive pressure that can be adjusted according to demand for the formation process of the secondary battery, so as to meet the requirements of different processes and different air pressures through a simple gas path design.

[0047] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation on the present invention.

[0049] Figure 1 It is a partial structural schematic diagram of a pressure control system used in a secondary battery formation process in the prior art;

[0050] Figure 2 It is a schematic diagram of a partial cross-sectional structure of a pressure control valve used in a pressure control system in the prior art;

[0051] Figure 3 It is a structural schematic diagram of a pressure control system provided by an embodiment of the utility model;

[0052] Figure 4 It is a schematic cross-sectional structure diagram of a pressure control valve used in a pressure control system provided by an embodiment of the utility model;

[0053] Figure 5 It is a partial structural schematic diagram of the area including the second channel and the third channel of the pressure control valve provided by the embodiment of the utility model;

[0054] Figure 6 It is a schematic diagram of the relationship between the outer loop controller and the inner loop controller included in the control platform provided by the embodiment of the utility model;

[0055] Figure 7 It is a schematic diagram of some functional areas of the pressure control valve provided by the embodiment of the utility model;

[0056] Figure 8 It is a schematic diagram of the relationship between the pressure control system, the main station and the secondary battery pack provided in the embodiment of the utility model.

[0057] Description of reference numerals:

[0058] 10-vacuum pump; 20-positive pressure gas source; 30-gas path; 40-pressure control valve; 41-valve body;

[0059] 411-first cavity area; 412-second cavity area; 42-first channel; 43-second channel; 44-third channel; 441-groove; 442-sealing lip; 45-pilot cavity; 46-valve core; 47-sealing structure; 471-first sealing member; 4711-first elastic component; 4712-first sealing cover; 472-second sealing member; 4721-second elastic component; 4722-second sealing cover;

[0060] 473-valve stem; 4731-boss; 4732-stop; 48-piezoelectric valve; 50-vacuum on-off valve;

[0061] 60-control platform; 61-outer loop controller; 62-inner loop controller; 70-pressure sensor;

[0062] 80-electrolyte filter; 91-vacuum breaking on-off valve; 92-pipe cleaning on-off valve; 100-pressure control system; 110-partial functional area; 200-main station; 300-secondary battery pack. DETAILED DESCRIPTION

[0063] Through research, it was found that Figure 2 As shown, in the existing pressure control valve, the design structure is as follows: the width D1 of the first cavity area 411 corresponding to the third channel of the existing pressure control valve is greater than the width D2 of the second cavity area 412, wherein the first cavity area 411 is used to accommodate the seal for sealing the third channel and allow the seal to reciprocate, and the second cavity area is located between the first channel and the third channel, and the third channel is connected to the external atmospheric environment. After the third channel is connected to the second channel, it connects the chemical gas path to the atmospheric environment. In this existing pressure control valve, when the third channel and the second channel are closed and the first channel and the second channel are connected, the force on the seal for sealing the third channel has two parts: one part is the force generated by the pressure generated by the connection between the first channel and the second channel on the seal for sealing the third channel, and the pressure of the third channel on the portion of the seal extending into the third channel generates the force on the portion extending into the third channel. Among them,

[0064] The force exerted on the sealing member used to seal the third channel by the pressure generated by the connection between the first channel and the second channel is as follows:

[0065]

[0066] The above formula (1) is simplified to get formula (2):

[0067]

[0068] Among them, F2 represents the comprehensive force exerted by the pressure generated by the connection between the first channel and the second channel on the seal used to seal the third channel; P2 represents the pressure generated by the connection between the first channel and the second channel; D2 represents the width of the second cavity area 412; D1 represents the width of the first cavity area 411; d2 represents the width of the valve stem.

[0069] Since the first channel is connected with the second channel to form a vacuum environment, P2 is a negative pressure. When D1>D2, F2 is upward, which has a reverse effect on the sealing of the seal. The greater the negative pressure (that is, the greater the vacuum degree), the greater F2 is, and the more obvious the weakening of the sealing of the seal is.

[0070] The force exerted by the pressure of the third channel on the portion extending into the third channel is expressed as follows:

[0071]

[0072] The above formula (3) is simplified to get formula (4):

[0073]

[0074] Among them, F3 represents the comprehensive force exerted by the pressure of the third channel on the part of the seal extending into the third channel; P3 represents the pressure of the third channel; D2 represents the width of the second cavity area 412; D1 represents the width of the first cavity area 411; d1 represents the total width of the sealing end face of the seal (the part of the seal extending into the third channel is a part of the sealing end face).

[0075] If the third channel provides positive pressure, P3 is positive pressure, then when D1>D2, F3 is upward, which has a reverse effect on the sealing of the sealing element.

[0076] That is, when the first channel and the second channel are connected, if the third channel is still connected to the positive pressure gas source, it is easy to cause the sealing of the corresponding seal of the third channel to be incomplete, so that the third channel has a relatively large leakage risk. Therefore, the existing pressure control valve can only provide a vacuum environment for the formation gas path, and cannot provide a controllable positive pressure environment for the formation gas path, resulting in the pressure control system used by the existing pressure control valve requiring more control valves and more complex gas paths to meet the vacuum breaking and cleaning requirements of the formation gas path.

[0077] The utility model provides a pressure control system and a pressure control valve that can realize positive and negative pressure regulation of a formation gas circuit through a pressure control valve. The pressure control system omits a vacuum breaking on-off valve 91 and a pipeline cleaning on-off valve 92, effectively simplifying the pressure control system and reducing the cost of the pressure control system.

[0078] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0079] in, Figure 3 A schematic diagram showing the structure of a pressure control system provided by an embodiment of the utility model is shown; Figure 4 A schematic cross-sectional structure diagram of a pressure control valve used in a pressure control system provided by an embodiment of the utility model is shown; Figure 5 A partial structural schematic diagram showing a region including a second channel and a third channel in a pressure control valve provided by an embodiment of the utility model; Figure 6 A schematic diagram showing the relationship between an outer loop controller and an inner loop controller included in the control platform provided by an embodiment of the utility model; Figure 7 A schematic diagram showing a partial functional area of ​​a pressure control valve provided by an embodiment of the utility model; Figure 8 A schematic diagram showing the interaction between a pressure control system, a main station and a secondary battery pack provided by an embodiment of the utility model is shown.

[0080] The channel connection of a device or gas circuit and a pressure control valve involved in the embodiments of the utility model generally refers to the device or gas circuit being connected to the channel through a pipeline. For example, the connection of a vacuum pump to a first channel means that the vacuum pump is connected to the first channel through a pipeline.

[0081] In addition, the terms "first", "second", "third", etc. included in the embodiments of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific number or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances. This is only a way of distinguishing objects with the same attributes when describing the embodiments of the present invention.

[0082] like Figure 3 and Figure 4 As shown, the pressure control system provided by the embodiment of the utility model may include:

[0083] Vacuum pump 10;

[0084] Positive pressure gas source 20;

[0085] A formation gas path 30 connected to an external secondary battery;

[0086] Pressure control valve 40;

[0087] The pressure control valve 40 includes a valve body 41, a first channel 42 connected to the vacuum pump 10, a second channel 43 connected to the formation gas path 30, and a third channel 44 connected to the positive pressure gas source 20, a pilot chamber 45, a valve core 46, and a sealing structure 47 connected to the valve core 46, which are arranged on the valve body 41.

[0088] The sealing structure 47 includes a first sealing member 471 for regulating the opening of the first channel 42 and a second sealing member 472 for regulating the opening of the third channel 44, wherein the width of the first cavity area 411 in the valve body 41 for accommodating the second sealing member 472 is consistent with the width of the second cavity area 412 in the valve body 41.

[0089] The second cavity area is located between the first channel 42 and the third channel 44 and is adjacent to the sealing end surface of the second sealing member 472 .

[0090] Specifically, the pressure control valve 40 drives the valve core 46 to drive the first seal 471 and the second seal 472 to move axially through the pressure change in the pilot chamber 45, thereby adjusting the opening of the first channel 42 and the third channel 44. The pressure control valve 40 can arbitrarily adjust the pressure of the formation gas circuit 30 within a set pressure range by adjusting the opening of the first channel 42 and the third channel 44. The pressure range is a pressure range determined according to the structure of the pressure control valve 40 and the pressure required by the formation gas circuit 30, which can not only ensure the normal operation of the pressure control valve 40, but also meet the vacuum degree, vacuum breaking and positive pressure requirements of cleaning the formation gas circuit of different secondary battery formation processes.

[0091] The vacuum pump 10 is used to provide a certain vacuum degree for the formation gas path.

[0092] The positive pressure gas source 20 is used to provide a certain positive pressure for the formation gas circuit.

[0093] Among them, the first channel 42 and the third channel 44 in the pressure control valve 40 in the pressure control system of the utility model are arranged along the axial direction of the valve body 41, and the first channel 42 and the third channel 44 are located on both sides of the second channel 43, and the connecting path between the first channel 42 and the second channel 43 and the connecting path between the third channel 44 and the second channel 43 are minimized to ensure that the pressure control valve 40 in the pressure control system can sensitively adjust the pressure of the formation gas path 30.

[0094] It is worth noting that the present invention does not limit the height of the second cavity area 412, that is, the height of the second cavity area 412 can be any value without affecting the sealing of the first channel 42 by the first seal 471. In addition, the height of the second cavity area 412 can be designed according to the mold and process production accuracy.

[0095] In addition, if Figure 5 As shown, the width of the first cavity region 411 for accommodating the second sealing member 472 is D1, and the width of the second cavity region 412 located between the first channel 42 and the third channel 44 and adjacent to the sealing end surface of the second sealing member 472 is D2. For the case where the cross-section of the first cavity region 411 and the cross-section of the second cavity region 412 are both circular, the width D1 of the first cavity region 411 is substantially the diameter of the cross-section of the first cavity region 411; the width D2 of the second cavity region 412 is substantially the diameter of the cross-section of the second cavity region 412. It is worth noting that for the case where the cross-section of the first cavity region 411 and the cross-section of the second cavity region 412 are other shapes, the width D1 of the first cavity region 411 is consistent with the width D2 of the second cavity region 412, which means that the cross-section of the first cavity region 411 and the cross-section of the second cavity region 412 are exactly the same in shape and size.

[0096] Generally speaking, the channel opening directly affects the flow rate and resistance of the fluid, and plays an important role in fluid control and regulation. It is the basis for the pressure control valve 40 to control the pressure and affect the pressure of the formation gas circuit 30. The channel opening generally refers to the size of the area not blocked by the seal or the distance between the current position of the seal and the position where the seal completely closes the channel. In other words, the change of the channel opening can be achieved by regulating the position of the seal of the channel. The larger the channel opening, the larger the area in the channel that is not blocked by the seal, the larger the distance between the current position of the seal and the position where the seal completely closes the channel, and the larger the fluid flow through the channel. On the contrary, the smaller the channel opening, the smaller the area in the channel that is not blocked by the seal, the smaller the distance between the current position of the seal and the position where the seal completely closes the channel, and the smaller the fluid flow through the channel. Based on this, the pressure change in the pilot chamber 45 of the pressure control valve 40 provided by the embodiment of the utility model affects the position of the first seal 471 in the first channel 42 and the position of the second seal 472 in the third channel 44, thereby affecting the opening of the first channel 42 and the opening of the third channel 44. Moreover, the pressure change in the pilot chamber 45 has opposite effects on the opening of the first channel 42 and the opening of the third channel 44. Specifically, as the pressure in the pilot chamber 45 increases, the opening of the first channel 42 increases, and the opening of the third channel 44 decreases. In the case where the second seal 472 completely blocks the passage between the third channel 44 and the second channel 43, the distance between the current position of the first seal 471 and the position where the first seal 471 completely closes the first channel 42 reaches the maximum, so that the opening of the first channel 42 reaches the maximum. In the case where the first seal 471 completely blocks the passage between the first channel 42 and the second channel 43, the distance between the current position of the second seal 472 and the position where the second seal 472 completely closes the third channel 44 reaches the maximum, so that the opening of the third channel 44 reaches the maximum. Therefore, by adjusting the positions of the first seal 471 and the second seal 472 and adjusting the openings of the first channel 42 and the third channel 44, the pressure of the formation gas path can be adjusted to any value between the positive pressure (the maximum pressure that the positive pressure gas source 20 can provide) and the negative pressure (the vacuum degree provided by the vacuum pump 10).

[0097] In a preferred embodiment, the pressure control valve 40 is used to adjust the pressure of the gas circuit 30 within the range of -1 to 6 bar. The pressure within the range of -1 to 0 bar can meet the requirements of the secondary battery formation process; the pressure within the range of 0 to 6 bar can meet the requirements of breaking vacuum and cleaning the pipeline. By controlling the pressure control valve 40 to adjust the pressure of the gas circuit 30 within the range of -1 to 6 bar, the requirements of the secondary battery charge and discharge test can be met, and the requirements of breaking vacuum and cleaning the pipeline can be met, thereby reducing energy consumption.

[0098] Therefore, for Figure 3 The pressure control system shown, the pressure control valve included therein is consistent with the width of the first cavity area in the valve body for accommodating the second sealing member, even if the third channel of the pressure control valve is connected to the positive pressure gas source, when the formation gas path is in a negative pressure environment, the second sealing member can also seal the third channel to avoid leakage of the third channel to ensure the vacuum degree of the formation gas path. In addition, when the third channel is connected to the second channel, the positive pressure gas source can provide positive pressure for the formation gas path to meet the needs of vacuum breaking and positive pressure cleaning of the formation gas path, so that the pressure control system can omit the vacuum breaking on-off valve and the pipeline cleaning on-off valve. Therefore, the pressure control system provided by the embodiment of the utility model is realized by designing a pressure control valve to provide vacuum and positive pressure that can be adjusted according to demand for the formation process of the secondary battery, and realizes that different processes and different air pressure requirements are met through simple gas path design.

[0099] Furthermore, if Figure 4 and Figure 5 As shown, for the pressure control valve 40 in the pressure control system, the third channel 44 of the pressure control valve 40 includes a groove 441 arranged near the inner wall of the valve body 41, wherein:

[0100] When the second seal 472 seals the third passage 44,

[0101] The area of ​​the sealing end surface of the second sealing member 472 extending to the third channel 44 covers a portion of the groove 441. Through this structural design, the third channel 44 is connected to the groove 441 to ensure that the pressure in the groove 441 is consistent with the pressure in the third channel 44.

[0102] Based on the structural design of the relative relationship between the groove 441 and the sealing end surface of the second sealing member 472, as shown in FIG. Figure 5 As shown in the above formula (3) / formula (4), when the sealing end face of the second sealing member 472 is completely sealed, the downward force exerted on the upper end face of the area where the sealing end face of the second sealing member 472 extends to the third channel 44 by the pressure in the third channel 44 is the same as the upward force exerted on the lower end face of the area where the sealing end face of the second sealing member 472 extends to the third channel 44, thereby ensuring the sealing performance of the second sealing member 472. This prevents the positive pressure in the third channel 44 from affecting the sealing of the second sealing member 472.

[0103] It is worth mentioning that Figure 4 and Figure 5 The schematic diagram of the structure of the pressure control valve 40 is only given as an example. The embodiment provided by the utility model does not limit the structure or shape of the pressure control valve 40. The pressure control valve 40 of any structure or shape can be used as long as it is designed as follows. Figure 5The purpose of making the width of the first cavity area 411 shown consistent with the width of the second cavity area 412 in the valve body 41 is to ensure that the second seal 472 can seal the third channel 44 and avoid leakage of the third channel 44, so as to regulate the gas path between negative pressure and positive pressure, which is within the scope of protection of the present utility model.

[0104] Furthermore, if Figure 4 As shown, the sealing structure 47 further includes: a valve stem 473 movably connected to the valve core 46;

[0105] The second sealing member 472 includes: a second elastic component 4721 and a second sealing cover 4722;

[0106] A sealing lip 442 is provided at the intersection of the third channel 44 and the inner cavity side wall of the valve body 41;

[0107] The second sealing cover 4722 is nested on the valve stem 473;

[0108] The second elastic component 4721 cooperates with the sealing lip 442 (the sealing lip 442 is adjacent to the second cavity area 412) to elastically press the second sealing cover 4722 between the side wall of the valve stem 473, the side wall of the cavity in the valve body 41 and the sealing lip 442; the valve stem 473 overcomes the elastic force of the second elastic component 4721 to drive the second sealing cover 4722 to reciprocate in the first cavity area 411.

[0109] The second elastic component 4721 can be any component that can provide elastic force, such as a spring. Figure 4 As shown, one end of the second elastic component 4721 is connected to one end of the first cavity region 411 away from the sealing end surface of the second sealing cover 4722, and the other end of the second elastic component 4721 is connected to the second sealing cover 4722. The second elastic component 4721 and the valve stem 473 jointly adjust the state of the second sealing cover 4722 sealing the third channel 44. The change in the pressure in the pilot cavity 45 can change the force of the second elastic component 4721 on the second sealing cover 4722.

[0110] Furthermore, if Figure 4 As shown, the valve stem 473 is provided with a boss 4731 facing the second sealing cover 4722. When the third channel 44 is in an open state, the boss 4731 facing the second sealing cover 4722 cooperates with the second elastic component 4721 to assist in supporting the second sealing cover 4722.

[0111] Furthermore, the relative relationship between the first sealing member 471 and the side wall of the valve stem 473 and the side wall of the cavity in the valve body 41 is similar to that of the second sealing member 472. Figure 4As shown, the first sealing member 471 includes: a first elastic component 4711 and a first sealing cover 4712; a stopper 4732 for one-way blocking the first sealing cover 4712 is also provided on the bottom of the valve stem 473; the first sealing cover 4712 is nested on the end cover provided at the bottom of the valve body 41, and the end face of the stopper 4732 for one-way blocking the first sealing cover 4712 forms a limiting assembly with the first sealing cover 4712.

[0112] Specifically, when the pressure in the pilot chamber 45 increases, the pilot chamber 45 drives the valve core 46 to drive the valve stem 473 to move in the direction away from the pilot chamber 45, and the valve stem 473 overcomes the force of the first elastic component 4711 on the first sealing cover 4712 to move the first sealing cover 4712 in the direction away from the pilot chamber 45, and the force of the second elastic component 4721 on the second sealing cover 4722 is in the direction away from the pilot chamber 45, thereby reducing the opening of the third channel 44, and even achieving the purpose of sealing the third channel 44, and at the same time increasing the opening of the first channel 42. When the pressure in the pilot chamber 45 decreases, the pilot chamber 45 drives the valve core 46 to drive the valve stem 473 to move toward the direction close to the pilot chamber 45. The valve stem 473 overcomes the force of the second elastic component 4721 on the second sealing cover 4722 in the opposite direction, thereby increasing the opening of the third channel 44. The first elastic component 4711 provides a force for the first sealing cover 4712 in the direction close to the pilot chamber 45, so that the first sealing cover 4712 moves in the direction close to the pilot chamber 45 to reduce the opening of the first channel 42, and even make the first sealing cover 4712 completely seal the first channel 42 to provide positive pressure for the formation gas path 30.

[0113] Furthermore, if Figure 3 As shown, the pressure control system may further include: a vacuum on-off valve 50, wherein:

[0114] An air inlet end of the vacuum on-off valve 50 is connected to the second channel 43 , and an air outlet end of the vacuum on-off valve 50 is connected to the formation gas path 30 .

[0115] The vacuum on-off valve 50 can be used to control the formation gas circuit to work or stop working, thereby increasing the controllability of the formation gas circuit 30.

[0116] Furthermore, if Figure 3 As shown, the pressure control system may further include: a control platform 60 and a pressure sensor 70 for detecting the pressure of the formation gas circuit 30, wherein:

[0117] The pressure sensor 70 is connected to the control platform 60 by signal, and is used to transmit a pressure signal corresponding to the pressure to the control platform 60;

[0118] The control platform 60 is used to adjust the pressure in the pilot chamber 45 according to the pressure signal.

[0119] By cooperating with the control platform 60 and the pressure sensor 70, the pressure of the formation gas circuit 30 can be automatically regulated according to the pressure of the formation gas circuit 30, so that the regulation of the formation gas circuit 30 can be completed automatically, and the pressure in the formation gas circuit 30 can be ensured to be relatively stable, thereby ensuring the stable operation of the pressure control system.

[0120] Specifically, Figure 6 As shown, the control platform 60 may include: an outer loop controller 61 and an inner loop controller 62 arranged in cascade in the pressure control valve 40, wherein:

[0121] The outer loop controller 61 responds to the pressure signal sent by the pressure sensor 70 (the pressure signal is the pressure of the formation gas circuit 30), generates an output signal according to the pressure signal and the pressure control requirements of the system, and transmits the output signal to the inner loop controller 62;

[0122] The inner loop controller 62 acts on the pilot chamber 45 to adjust the pressure in the pilot chamber 45 in combination with the output signal of the outer loop controller 61 and the pressure feedback in the pilot chamber 45 .

[0123] Among them, the logic of generating the output signal according to the pressure signal and the pressure control requirements of the system can be implemented according to the signal generation program set by the outer loop controller 61. In this solution, the logic of generating the output signal can be implemented using existing technology.

[0124] The outer loop controller 61 and the inner loop controller 62 can be implemented by a PCB chip provided on the pressure control valve 40 in cooperation with a logic execution program.

[0125] Furthermore, if Figure 7 As shown, the pressure control valve 40 further includes a piezoelectric valve 48 . The piezoelectric valve 48 is arranged at the side of the valve body 41 , and the piezoelectric valve 48 is communicated with the pilot chamber 45 through a gas channel.

[0126] The inner loop controller 62 regulates the pressure in the pilot chamber 45 in essence by transmitting a voltage signal to the piezoelectric valve 48, which receives the voltage signal and adjusts the pressure in the pilot chamber to drive the valve stem to move. The way in which the piezoelectric valve controls the pressure in the pilot chamber has lower power consumption and longer service life. At the same time, the piezoelectric valve has the characteristics of flexible and fast switching, fast response speed, and smoother control effect, which improves the accuracy and response speed of pressure regulation and provides stable and reliable pressure regulation for the formation gas path.

[0127] In addition, the accuracy and precision of adjusting the pressure in the pilot chamber 45 can be ensured by the cooperation of the cascaded outer loop controller 61 and the inner loop controller 62 .

[0128] It is worth noting that the outer loop controller 61 and the inner loop controller 62 of the cascade are integrated into the pressure control valve 40, so that the outer loop controller 61 and the inner loop controller 62 of the cascade serve the pressure control valve 40 on which they are installed, so that the outer loop controller 61 and the inner loop controller 62 can better regulate the pressure control valve 40. In other words, the outer loop controller 61 and the inner loop controller 62 can be used as part of the pressure control valve 40.

[0129] Furthermore, a communication interface for connecting to an external host station can be provided on the housing of the pressure control valve 40. The pressure control valve 40 is connected to the external host station through the communication interface provided thereon, and is used to receive the working information related to the formation gas circuit 30 sent by the external host station. That is, the outer loop controller 61 can obtain the working information related to the formation gas circuit 30 through the communication interface provided by the pressure control valve 40. Figure 7 The partial functional area 110 of the pressure control valve 40 shown may include a PCB chip, circuit, communication interface, etc. for carrying a logic execution program. Among them, the PCB chip carries and runs the execution logic program of the outer loop controller 61 and the inner loop controller 62. In addition, the pressure control valve 40 may include a communication interface that meets multiple protocols (such as Modbus RTU communication protocol, IO-Link protocol, etc.), and the external master station can be connected to the communication interface included in the partial functional area 110 to provide the target pressure and PID parameters (such as reaction time, operating parameters of the pressure control valve 40, etc.) to the outer loop controller 61. In addition, the outer loop controller 61 can send data of the pressure control system such as the formation gas circuit pressure, the pilot chamber pressure, and optional logic control parameters to the external master station.

[0130] The external host station may be a visualized programmable logic controller (PLC), a desktop computer, a server, a notebook, a mobile terminal, etc., which is directly connected to the communication interface of the pressure control valve 40. The external host station may also be a device which is indirectly connected to the pressure control valve 40, such as a cloud server which is connected to the PLC, a desktop computer, a server, a notebook, a mobile terminal, etc.

[0131] Furthermore, the embodiment of the present utility model provides a pressure control valve 40. Figure 4 and Figure 5 As shown, the pressure control valve 40 may include: a valve body 41, a first channel 42 connected to the vacuum pump 10, a second channel 43 connected to the formation gas path 30, and a third channel 44 connected to the positive pressure gas source 20, a pilot chamber 45, a valve core 46, and a sealing structure 47 connected to the valve core 46, which are arranged on the valve body 41.

[0132] The sealing structure 47 includes a first sealing member 471 for adjusting the opening of the first channel 42 and a second sealing member 472 for adjusting the opening of the third channel 44, wherein:

[0133] The width of the first cavity region 411 in the valve body 41 for accommodating the second sealing member 472 is consistent with the width of the second cavity region 412 in the valve body 41 .

[0134] The second cavity area is located between the first channel 42 and the third channel 44 and is adjacent to the sealing end surface of the second sealing member 472 .

[0135] Specifically, the pressure control valve 40 drives the valve core 46 to drive the first sealing member 471 and the second sealing member 472 to move axially through the pressure change in the pilot chamber 45 , thereby adjusting the opening of the first channel 42 and the third channel 44 .

[0136] The pressure control valve 40 can adjust the pressure of the formation gas path 30 within a set pressure range (e.g., -1 to 6 bar) by adjusting the openings of the first channel 42 and the third channel 44. The pressure range is a pressure range determined according to the structure of the pressure control valve 40 and the pressure required by the formation gas path 30, which can not only ensure the normal operation of the pressure control valve 40, but also meet the vacuum degree, vacuum breaking and positive pressure requirements of cleaning the formation gas path of different secondary battery formation processes.

[0137] against Figure 4 and Figure 5 The pressure control valve shown, because the width of the first cavity area for accommodating the second sealing member in the valve body is consistent with the width of the second cavity area in the valve body, even if the third channel of the pressure control valve is connected with the positive pressure gas source, when the formation gas path is in a negative pressure environment, the second sealing member can also seal the third channel to avoid leakage of the third channel to ensure the vacuum degree of the formation gas path. In addition, when the third channel is connected with the second channel, the positive pressure gas source can provide positive pressure for the formation gas path, meet the needs of vacuum breaking and positive pressure cleaning of the formation gas path, so that the pressure control system using the pressure control valve can omit the vacuum breaking on-off valve and the pipeline cleaning on-off valve. Therefore, the pressure control valve provided by the embodiment of the utility model is applied to the pressure control system for the formation process of the secondary battery, which can be realized as the formation process of the secondary battery. Provide vacuum and positive pressure that can be adjusted according to demand, realize through a simple gas path design, meet different processes and different air pressure requirements.

[0138] Furthermore, if Figure 4 and Figure 5 As shown, the third channel 44 of the pressure control valve 40 includes a groove 441 disposed near the inner wall of the valve body 41, wherein:

[0139] When the second seal 472 seals the third passage 44,

[0140] The sealing end surface of the second sealing member 472 extends to a region of the third passageway covering a portion of the groove.

[0141] Furthermore, if Figure 4 As shown, the sealing structure 47 further includes: a valve stem 473 movably connected to the valve core 46;

[0142] The second sealing member 472 includes: a second elastic component 4721 and a second sealing cover 4722;

[0143] A sealing lip 442 is provided at the intersection of the third channel 44 and the inner cavity side wall of the valve body 41;

[0144] The second sealing cover 4722 is nested on the valve stem 473;

[0145] The second elastic component 4721 cooperates with the sealing lip 442 (the sealing lip 442 is adjacent to the second cavity area 412) to elastically press the second sealing cover 4722 between the side wall of the valve stem 473, the side wall of the cavity in the valve body 41 and the sealing lip 442; the valve stem 473 overcomes the elastic force of the second elastic component 4721 to drive the second sealing cover 4722 to reciprocate in the first cavity area 411.

[0146] Furthermore, a boss 4721 facing the second sealing cover 4722 is provided on the valve stem 473. When the third channel 44 is in an open state, the boss 4721 facing the second sealing cover 4722 cooperates with the second elastic component 4721 to assist in supporting the second sealing cover 4722.

[0147] Furthermore, the relative relationship between the first sealing member 471 and the side wall of the valve stem 473 and the side wall of the cavity in the valve body 41 is similar to that of the second sealing member 472. Figure 4 As shown, the first sealing member 471 includes: a first elastic component 4711 and a first sealing cover 4712; a stopper 4732 for one-way blocking the first sealing cover 4712 is also provided on the bottom of the valve stem 473; the first sealing cover 4712 is nested on the end cover provided at the bottom of the valve body 41, and the end face of the stopper 4732 for one-way blocking the first sealing cover 4712 forms a limiting assembly with the first sealing cover 4712.

[0148] The principle of adjusting the opening of the first sealing cover 4712 and the second sealing cover 4722 has been described above and will not be repeated here.

[0149] Furthermore, if Figure 6 As shown, the pressure control valve 40 may further include: a cascaded outer loop controller 61 and an inner loop controller 62, wherein:

[0150] In the case where the pressure control valve 40 is applied to a pressure control system, the outer loop controller 61 transmits an output signal to the inner loop controller 62 in response to a pressure signal sent by a pressure sensor 70 in the pressure control system;

[0151] The inner loop controller 62 acts on the pilot chamber 45 to adjust the pressure in the pilot chamber 45 in combination with the output signal of the outer loop controller 61 and the pressure feedback in the pilot chamber 45 .

[0152] Among them, the logic of generating the output signal according to the pressure signal and the pressure control requirements of the system can be implemented according to the signal generation program set by the outer loop controller 61. In this solution, the logic of generating the output signal can be implemented using existing technology.

[0153] The outer loop controller 61 and the inner loop controller 62 are implemented by cooperating with a logic execution program through a PCB chip provided on the pressure control valve 40 .

[0154] Furthermore, if Figure 7 As shown, the pressure control valve 40 further includes a piezoelectric valve 48 . The piezoelectric valve 48 is arranged at the side of the valve body 41 , and the piezoelectric valve 48 is communicated with the pilot chamber 45 through a gas channel.

[0155] The inner loop controller 62 regulates the pressure in the pilot chamber 45 in essence by transmitting a current signal to the piezoelectric valve 48, which receives the current signal and adjusts the pressure in the pilot chamber to drive the valve stem to move. The way in which the piezoelectric valve controls the pressure in the pilot chamber has lower power consumption and longer service life. At the same time, the piezoelectric valve has the characteristics of flexible and fast switching, fast response speed, and smoother control effect, which improves the accuracy and response speed of pressure regulation and provides stable and reliable pressure regulation for the formation gas path.

[0156] In addition, the accuracy and precision of adjusting the pressure in the pilot chamber 45 can be ensured by the cooperation of the cascaded outer loop controller 61 and the inner loop controller 62 .

[0157] In addition, if Figure 7 As shown, the pressure control valve 40 may further include: a communication interface area 110, wherein:

[0158] The communication interface area 110 is used to provide a communication interface for the external master station to communicate with the outer ring controller 61 .

[0159] In summary, if Figure 8As shown, the pressure control valve 40 provided by the utility model is connected with the formation gas circuit 30 and the vacuum on-off valve 50 and the pressure sensor 70 provided on the formation gas circuit 30 to form a pressure control system 100, and the main station 200 is connected with the communication interface provided by the pressure control valve 40 to establish communication with the pressure control system 100. The secondary battery pack 300 in the formation process is connected to the pressure control system 100 for charging and discharging. The main station 200 can provide parameters such as target pressure and PID parameters for the pressure control system 100, and obtain working chamber pressure, pilot pressure, etc. from the pressure control system 100.

[0160] In addition, an electrolyte filter 80 is also provided on the formation gas path 30, and the electrolyte filter 80 can filter the corrosive gas and pollutant gas in the gas generated by the charging and discharging of the secondary battery, so as to prevent the corrosive gas from corroding the pressure control valve and reduce the emission of harmful gases.

[0161] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A pressure control system, characterized in that: include: Vacuum pump (10); Positive pressure gas source (20); A formation gas path (30) connected to an external secondary battery; A pressure control valve (40); The pressure control valve (40) comprises a valve body (41), a first channel (42) arranged on the valve body (41) and connected to the vacuum pump (10), a second channel (43) connected to the formation gas path (30), and a third channel (44) connected to the positive pressure gas source (20), a pilot chamber (45) arranged in the valve body (41), a valve core (46), and a sealing structure (47) connected to the valve core (46), wherein: The sealing structure (47) comprises a first sealing member (471) for regulating the opening of the first channel (42) and a second sealing member (472) for regulating the opening of the third channel (44), wherein the width of a first cavity region (411) in the valve body (41) for accommodating the second sealing member (472) is consistent with the width of a second cavity region (412) in the valve body (41).

2. The pressure control system according to claim 1, characterized in that: The second cavity area (412) is located between the first channel (42) and the third channel (44) and is adjacent to the sealing end surface of the second sealing member (472); and / or, The pressure control valve (40) drives the valve core (46) to drive the first sealing member (471) and the second sealing member (472) to move axially through the pressure change in the pilot chamber (45), thereby regulating the opening of the first channel (42) and the third channel (44); and / or, The third channel (44) includes a groove (441) disposed near the side wall of the inner cavity of the valve body (41), wherein: When the second seal (472) seals the third passage (44), The sealing end surface of the second sealing member (472) extends to a region of the third channel (44) covering a portion of the groove (441).

3. The pressure control system according to claim 1 or 2, characterized in that: The sealing structure (47) further includes: a valve stem (473) movably connected to the valve core (46); The second sealing member (472) comprises: a second elastic component (4721) and a second sealing cover (4722); A sealing lip (442) is provided at the intersection of the third channel (44) and the inner cavity side wall of the valve body (41); wherein: The second sealing cover (4722) is nested on the valve stem (473); The second elastic component (4721) cooperates with the sealing lip (442) to elastically press and assemble the second sealing cover (4722) between the side wall of the valve stem (473), the side wall of the inner cavity of the valve body (41) and the sealing lip (442); The valve stem (473) overcomes the elastic force of the second elastic component (4721) and drives the second sealing cover (4722) to reciprocate in the first cavity area (411).

4. The pressure control system according to claim 1, characterized in that: Also includes: A vacuum on-off valve (50), wherein: The air inlet end of the vacuum on-off valve (50) is connected to the second channel (43), and the air outlet end of the vacuum on-off valve (50) is connected to the formation gas path (30).

5. The pressure control system according to any one of claims 1, 2 and 4, characterized in that: Also includes: A control platform (60) and a pressure sensor (70) for detecting the pressure of the formation gas path (30), wherein: The pressure sensor (70) is connected to the control platform (60) by signal, and is used to transmit a pressure signal corresponding to the pressure to the control platform (60); The control platform (60) is used to regulate the pressure in the pilot chamber (45) according to the pressure signal.

6. The pressure control system according to claim 5, characterized in that: The control platform (60) comprises: an outer loop controller (61) and an inner loop controller (62) arranged in cascade in the pressure control valve (40), wherein: The outer loop controller (61) transmits an output signal to the inner loop controller (62) in response to a pressure signal sent by the pressure sensor (70); The inner loop controller (62) acts on the pilot chamber (45) and is used to adjust the pressure in the pilot chamber (45) by combining the output signal of the outer loop controller (61) and the pressure feedback in the pilot chamber (45).

7. The pressure control system according to claim 6, characterized in that: The pressure control valve (40) is connected to an external main station for communication, and is used to receive working information related to the formation gas circuit (30) sent by the external main station.

8. The pressure control system according to any one of claims 1, 2, 4, 6 and 7, characterized in that: The pressure control valve (40) is used to adjust the pressure of the formation gas circuit (30) within a range of -1 to 6 bar.

9. A pressure control valve (40), characterized in that: include: A valve body (41), a first channel (42) connected to a vacuum pump (10), a second channel (43) connected to a formation gas path (30), and a third channel (44) connected to a positive pressure gas source (20) arranged on the valve body (41), a pilot chamber (45), a valve core (46), and a sealing structure (47) connected to the valve core (46) arranged in the valve body (41), wherein: The sealing structure (47) comprises a first sealing member (471) for adjusting the opening of the first channel (42) and a second sealing member (472) for adjusting the opening of the third channel (44), wherein: The width of the first cavity area (411) in the valve body (41) for accommodating the second sealing member (472) is consistent with the width of the second cavity area (412) in the valve body (41).

10. The pressure control valve (40) according to claim 9, characterized in that: The second cavity area is located between the first channel (42) and the third channel (44) and is adjacent to the sealing end surface of the second sealing member (472); and / or, The pressure control valve (40) drives the valve core (46) to drive the first sealing member (471) and the second sealing member (472) to move axially through the pressure change in the pilot chamber (45), thereby regulating the opening of the first channel (42) and the third channel (44); and / or, The third channel (44) includes a groove (441) disposed near the inner side wall of the valve body (41), wherein: When the second seal (472) seals the third passage (44), The sealing end surface of the second sealing member (472) extends to a region of the third channel (44) and covers a portion of the groove (441); and / or, The pressure control valve (40) is further provided with a cascaded outer loop controller (61) and an inner loop controller (62), wherein: When the pressure control valve (40) is applied to a pressure control system, the outer loop controller (61) transmits an output signal to the inner loop controller (62) in response to a pressure signal sent by a pressure sensor (70) in the pressure control system; The inner loop controller (62) acts on the pilot chamber (45) and is used to adjust the pressure in the pilot chamber (45) by combining the output signal of the outer loop controller (61) and the pressure feedback in the pilot chamber (45).

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