Negative pressure adsorption device and formation system

Abstract

The present application provides a negative pressure adsorption device and a formation system. The negative pressure adsorption device comprises an adsorption body and an abutting portion; the adsorption body is provided with a channel, and an inlet and an outlet which are communicated with the channel; the abutting portion protrudes out of and is connected to one side of the adsorption body in a first direction and is arranged around the inlet. The abutting portion is arranged around the inlet of the adsorption body and covers an electrolyte injection hole of a battery, so as to ensure sealing in a battery formation process. The height dimension of the part of the abutting portion protruding out of the adsorption body in the first direction is adjustable, so that the abutting portion can drive the adsorption body to move towards the side of the electrolyte injection hole of the battery to press the adsorption body against an elastic switch valve, thereby keeping the elastic switch valve open in the formation process, and achieving valve opening for exhaust in the battery formation process.

Description

Negative pressure adsorption device and chemical formation system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202323590797.9, filed on December 27, 2023, entitled “Negative Pressure Adsorption Device and Formation System,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of power batteries, and in particular to a negative pressure adsorption device and a formation system. Background Art

[0004] Formation is the process of activating a battery after injection, causing a chemical reaction inside the battery to form a solid electrolyte interphase (SEI) film, ensuring the battery's performance during subsequent charge and discharge cycles. During this process, the battery produces a certain amount of gas, which affects the formation of the SEI film and, in turn, the battery's subsequent performance.

[0005] To prevent gases generated during battery formation from affecting the formation of the SEI film, a high negative pressure must be maintained inside the battery during the formation process to allow gases to be discharged in real time. However, the injection port of new batteries is equipped with an elastic on-off valve, which increases the difficulty of draining the negative pressure and hinders the exhaust during the battery formation process. Therefore, how to achieve valve-opening exhaust during the battery formation process has become an urgent problem to be solved.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a negative pressure adsorption device and a formation system, which can realize valve opening and exhaust during the battery formation process while ensuring the battery is sealed.

[0008] In the first aspect, the present application provides a negative pressure adsorption device, including an adsorption body and an abutment portion, the adsorption body having a channel and an inlet and an outlet connected to the channel, the abutment portion protrudingly connected to one side of the adsorption body in a first direction and arranged around the inlet, wherein the height dimension of the abutment portion protruding from the adsorption body in the first direction is adjustable.

[0009] In the embodiment of the present application, the abutment portion can be arranged around the inlet of the adsorption body and cover the battery's injection hole to ensure sealing during the battery formation process. Furthermore, by making the height of the abutment portion protruding from the adsorption body in the first direction adjustable, the abutment portion can be used to drive the adsorption body toward the side closer to the battery's injection hole, thereby squeezing the elastic switch valve through the adsorption body, so that the elastic switch valve remains open during the formation process, achieving valve-opening and venting during the battery formation process.

[0010] In some embodiments, the abutment portion is configured as an elastic material body, and the negative pressure adsorption device includes a first state and a second state; in the first state, the abutment portion protrudes a first distance relative to the adsorption body along a first direction, and in the second state, the abutment portion is in an elastically deformed state, and the abutment portion protrudes a second distance relative to the adsorption body along the first direction, and the second distance is smaller than the first distance.

[0011] In some embodiments, the abutting portion and the adsorption body are configured as an integrated structure, which reduces manufacturing difficulty and provides higher reliability.

[0012] In some embodiments, a groove is provided at the junction of the adsorption body and the abutment portion, and the groove is used to weaken the supporting strength of the abutment portion, so that when the negative pressure adsorption device is pressed downward, the abutment portion is guided to undergo elastic deformation relative to the adsorption body at the groove, thereby reducing the deformation amount of the abutment portion, increasing the downward pressure amount of the negative pressure adsorption device, reducing the difficulty of deformation, and also making the deformation of the abutment portion more controllable.

[0013] In some embodiments, the abutment portion is formed with a guide channel connected to the inlet, and the size of the guide channel along the second direction gradually increases in the direction away from the adsorption body, and the second direction intersects with the first direction. Specifically, the inner wall surface of the abutment portion can be inclined, so that when the negative pressure adsorption device is pressed down, the abutment portion can be guided to deform outward along the second direction, reducing the difficulty of deformation, and also making the deformation of the abutment portion more controllable, so as to achieve sealing during the process of pressing down the negative pressure adsorption device.

[0014] In some embodiments, the adsorbent body has a groove disposed on an end surface facing the abutment portion in the first direction, the groove communicating with the inlet, and the abutment portion at least surrounding the groove. By providing the groove on the end surface communicating with the inlet, the groove can serve as a confluence, allowing gas within the flow channel to flow through the groove to the inlet of the adsorbent body, thereby facilitating the discharge of gas from the battery.

[0015] In some embodiments, there are multiple grooves, and the multiple grooves are radially extended relative to the inlet; or, the multiple grooves are distributed in concentric rings relative to the inlet, and two adjacent grooves are connected to each other, which can better play the role of confluence, and can also further be compatible with the position offset of the negative pressure adsorption device and the battery end cover, thereby improving applicability.

[0016] In some embodiments, the channel includes a first section and a second section connected to each other, the first section is arranged closer to the inlet relative to the second section, and the diameter of the first section is smaller than the diameter of the second section, so that negative pressure can be more easily formed to quickly discharge the gas from the negative pressure adsorption device.

[0017] In some embodiments, the channel also includes a third section, which is connected between the first section and the second section. The diameter of the third section is gradually changed from the first section to the second section, so as to form a transition structure between the first section and the second section, so as to more reliably realize the discharge of gas in the battery during the formation process.

[0018] In a second aspect, an embodiment of the present application provides a chemical formation system, comprising the negative pressure adsorption device of the first aspect.

[0019] According to an embodiment of the present application, the negative pressure adsorption device includes an adsorption body and an abutment portion. The abutment portion is provided protruding from one side of the adsorption body along a first direction, and the abutment portion is provided around the inlet of the adsorption body. Therefore, when the negative pressure adsorption device is placed on a battery, the abutment portion can support the adsorption body on the battery and cover the battery's injection hole to ensure the battery's sealing. In addition, by making the height dimension of the abutment portion protruding from the adsorption body in the first direction adjustable, the abutment portion can be used to drive the adsorption body to move toward the side close to the battery's injection hole, thereby squeezing the elastic switch valve through the adsorption body, so that the elastic switch valve remains open during the formation process, thereby achieving valve opening and exhaust during the battery formation process.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0022] FIG1 is a schematic structural diagram of a negative pressure adsorption device provided in some embodiments of the present application;

[0023] FIG2 is a front view of a negative pressure adsorption device provided in some embodiments of the present application;

[0024] FIG3 is a cross-sectional view of a negative pressure adsorption device provided in some embodiments of the present application;

[0025] FIG4 is a cross-sectional view of a negative pressure adsorption device provided by some embodiments of the present application, provided on a battery in a first state;

[0026] FIG5 is an enlarged view of point A in FIG4 ;

[0027] FIG6 is a cross-sectional view of a negative pressure adsorption device provided by some embodiments of the present application, provided on a battery in a second state;

[0028] FIG7 is an enlarged view of point B in FIG6;

[0029] FIG8 is a bottom view of a negative pressure adsorption device provided in some embodiments of the present application;

[0030] FIG9 is a cross-sectional view of a negative pressure adsorption device provided in some other embodiments of the present application;

[0031] FIG10 is a bottom view of a negative pressure adsorption device provided in other embodiments of the present application.

[0032] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0033] Marking Description:

[0034] 100 negative pressure adsorption device, 200 battery, 210 end cover, 300 elastic switch valve, 310 valve body, 320 fixed section, 330 movable section, 340 elastic member;

[0035] 1 adsorption body, 11 channel, 111 first section, 112 second section, 113 third section, 12 end surface, 121 groove, 2 abutment portion, 21 groove;

[0036] K1 import, K2 export;

[0037] X is the first direction, Y is the second direction. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0041] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0042] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0043] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] The purpose of formation is to activate the battery. During the initial charge and discharge process, the electrode material and electrolyte react at the solid-liquid interface, forming a passivation film covering the surface of the electrode material. This passivation film is an interface layer with the characteristics of a solid electrolyte. This passivation film is also called the solid electrolyte interface film, or SEI film for short. The formation of the SEI film has a crucial impact on the subsequent performance of the battery.

[0045] Currently, in order to facilitate the discharge of gas during the battery formation process and prevent the gas generated during the battery formation process from affecting the formation of the SEI film, during the battery formation process, a negative pressure source is connected to the interior of the battery through a pipe, and a suction nozzle is pressed against the battery's injection hole to pump negative pressure into the battery to exhaust the gas. In this way, by connecting the battery to the negative pressure source to create a negative pressure environment inside the battery, the battery's formation exhaust gas can be promptly pumped out of the battery housing.

[0046] However, in related art, the end caps of new batteries are equipped with an elastic switch valve at the battery's liquid injection hole. When no liquid is injected, the elastic switch valve is in a closed and sealed state to provide a sealed protection for the battery. However, in this structure, due to the limitations of the elastic switch valve, it is difficult for the suction nozzle to directly pass through the battery's liquid injection hole to exhaust the negative pressure inside the battery.

[0047] In order to solve the above technical problems, the embodiments of the present application provide a negative pressure adsorption device and a formation system, which can press against the elastic switching valve to keep the elastic switching valve open during the formation process, thereby achieving formation exhaust of the battery.

[0048] Please refer to Figures 1 to 7. The negative pressure adsorption device 100 provided in an embodiment of the present application includes an adsorption body 1 and an abutment portion 2. The adsorption body 1 has a channel 11 and an inlet K1 and an outlet K2 connected to the channel 11. The abutment portion 2 protrudes and is connected to one side of the adsorption body 1 in the first direction X and is arranged around the inlet K1. The height dimension of the abutment portion 2 protruding from the adsorption body 1 in the first direction X is adjustable.

[0049] It can be understood that the outlet K2 of the adsorption body 1 is used to connect with the negative pressure source, the channel 11 of the adsorption body 1 provides a negative pressure pipeline, and is used to connect with the injection hole of the battery 200 through the inlet K1 of the adsorption body 1, so that the interior of the battery 200 is in a negative pressure environment.

[0050] The negative pressure adsorption device 100 in the embodiment of the present application has an abutment portion 2 protruding from one side of the adsorption body 1 along the first direction X. The abutment portion 2 is arranged around the inlet K1 of the adsorption body 1. Therefore, when the negative pressure adsorption device 100 is placed on the battery 200, the abutment portion 2 can support the adsorption body 1 on the battery 200 and cover the injection hole of the battery 200 to ensure the sealing of the battery 200. In addition, by making the height of the abutment portion 2 protruding from the adsorption body 1 in the first direction X adjustable, the abutment portion 2 can drive the adsorption body 1 to move toward the side of the injection hole of the battery 200, thereby squeezing the elastic switch valve 300 through the adsorption body 1, so that the elastic switch valve 300 remains open during the formation process, thereby achieving valve-opening and exhaust during the formation process of the battery 200.

[0051] It should be noted that the negative pressure adsorption device 100 in the embodiment of the present application can be used for a battery 200 provided with an elastic switching valve 300, and can also be used for a battery 200 not provided with an elastic switching valve 300. The battery 200 can be a secondary battery, which means a battery 200 that can be recharged to activate the active material after discharge and continue to be used.

[0052] The battery 200 includes a housing, an electrode assembly, an end cap 210 and other functional components.

[0053] The housing is a component that cooperates with the end cap 210 to form the internal environment of the battery 200. This internal environment can be used to accommodate the electrode assembly, electrolyte, and other components. The housing and the end cap 210 can be independent components. The housing can be provided with an opening, and the end cap 210 is placed over the opening to form the internal environment of the battery 200.

[0054] The injection hole is a through-hole provided on the battery 200 and communicating with the interior of the battery 200. Electrolyte can be injected into the battery 200 through the injection hole. The injection hole can be circular, elliptical, or polygonal in shape and can be located on the end cap 210, on the side of the housing, or on the bottom of the housing. Multiple injection holes can be provided to improve the efficiency of injecting electrolyte into the battery 200.

[0055] Referring to Figures 3 to 7, the elastic switching valve 300 may include a valve body 310 and a valve sleeve. The valve sleeve is sleeved on the outer periphery of the valve body 310 and includes a fixed section 320 and a movable section 330 that are separately arranged. The fixed section 320 is connected to the battery end cover 210, and the movable section 330 extends into the liquid injection hole and is connected to the fixed section 320 through an elastic member 340. The valve body 310 is overlapped on the movable section 330 and is arranged to protrude from the battery end cover 210 along the first direction X.

[0056] Under normal conditions, the fixed section 320 and the movable section 330 are connected and block the liquid injection hole of the battery 200. However, when the valve body 310 is pressed against the valve body 310, the valve body 310 drives the movable section 330 to move in the first direction X, elastically deforming the elastic member 340. An air gap is formed between the movable section 330 and the fixed section 320, thereby opening the valve. Furthermore, when the pressure on the valve body 310 is released, the movable section 330 reconnects with the fixed section 320 due to the restoring force of the elastic member 340, thereby sealing the battery 200.

[0057] Taking the elastic switching valve 300 in the above embodiment as an example, in the negative pressure adsorption device 100 in the embodiment of the present application, by adjusting the size of the abutting portion 2 along the first direction X, the adsorption body 1 can be driven to move toward the side of the injection hole close to the battery 200, and the valve body 310 of the elastic switching valve 300 is pressed by the adsorption body 1, thereby realizing effective valve opening during the formation process. The overall structure is simple and the design is stable and reliable.

[0058] With respect to the elastic switching valve 300 in the above-described embodiment, when designing the negative pressure adsorption device 100, the maximum dimension of the abutment portion 2 protruding from the adsorption body 1 along the first direction X can be greater than the height of the valve body 310 protruding from the end cap 210 along the first direction X. This allows the abutment portion 2 to contact and seal with the end cap 210 of the battery 200 when the negative pressure adsorption device 100 is installed on the battery 200, thereby reducing the risk of electrolyte being drawn out of the battery 200 and contaminating the end cap 210 during negative pressure pumping. Furthermore, the size of the inlet K1 of the adsorption body 1 is smaller than the size of the valve body 310, so that when the negative pressure adsorption device 100 is pressed downward, the adsorption body 1 can reliably press against the valve body 310 of the elastic switching valve 300, achieving effective valve opening during the formation process.

[0059] It is understandable that in some embodiments, a telescopic structure such as a sleeve-type telescopic joint or a sealed telescopic joint can be provided to adjust the height of the abutting portion 2 protruding from the adsorption body 1 in the first direction X.

[0060] Referring to Figures 3 to 7 , in other embodiments, the abutment portion 2 is formed of an elastic material, and the negative pressure adsorption device 100 includes a first state and a second state. In the first state, the abutment portion 2 protrudes a first distance relative to the adsorption body 1 along the first direction X. In the second state, the abutment portion 2 is elastically deformed and protrudes a second distance relative to the adsorption body 1 along the first direction X, which is smaller than the first distance.

[0061] Since the contact portion 2 is made of an elastic material, the negative pressure adsorption device 100 can be switched between the first state and the second state by pressing down the contact portion 2 .

[0062] When the negative pressure adsorption device 100 is in the first state, the contact portion 2 can cover the outer periphery of the liquid injection hole and contact the battery end cover 210 to form a seal. When the negative pressure adsorption device 100 is pressed downward to enter the second state, the contact portion 2 can elastically deform, and the adsorption body 1 can press against the valve body 310. The valve body 310 is forced to move in the first direction X to open the valve. The liquid injection hole in the battery 200 is connected to the inlet K1 of the adsorption body 1, thereby enabling the formation of the battery 200.

[0063] After the formation is completed, the negative pressure adsorption device 100 can be moved upward. After the adsorption body 1 is separated from the valve body 310, the elastic switch valve 300 can close the injection hole under the action of its own elastic force. After continuing to move upward, the abutment part 2 is separated from the battery end cover 210, and the abutment part 2 is restored to its original state under the action of the elastic restoring force. The negative pressure adsorption device 100 returns to the first state from the second state, thereby completing the entire formation process.

[0064] It is understood that the negative pressure adsorption device 100 can open the elastic switch valve 300 after forming a seal with the battery end cap 210, and the negative pressure adsorption device 100 can also be separated from the battery end cap 210 after closing the elastic switch valve 300. During the entire formation process, the battery 200 can always be isolated and sealed from the external environment, which can reduce the risk of formation gas overflowing into the environment or electrolyte leakage contaminating the top cover. At the same time, the structure is simple, the cost is low, and it is easy to operate.

[0065] In some optional embodiments, the abutment portion 2 and the adsorption body 1 are configured as an integral structure, and the abutment portion 2 can be arranged around the outer edge of the adsorption body 1, which reduces manufacturing difficulty and improves reliability. For example, the negative pressure adsorption device 100 can be made of a corrosion-resistant and elastic material, such as EPDM rubber.

[0066] Please refer to Figures 3 to 7. When the abutment portion 2 and the adsorption body 1 are set as an integrated structure, in order to facilitate the elastic deformation of the abutment portion 2 along the first direction X, optionally, a groove 21 is provided at the junction of the adsorption body 1 and the abutment portion 2 to weaken the supporting strength of the abutment portion 2 through the groove 21, so that when the negative pressure adsorption device 100 is pressed down, the abutment portion 2 is guided to elastically deform relative to the adsorption body 1 at the groove 21, thereby reducing the deformation amount of the abutment portion 2, increasing the downward pressure amount of the negative pressure adsorption device 100, reducing the difficulty of deformation, and also making the deformation of the abutment portion 2 more controllable.

[0067] Optionally, the groove 21 may be configured as an annular groove to make the deformation of the abutting portion 2 more uniform, thereby reducing the risk of the negative pressure adsorption device 100 tipping over to one side when the negative pressure adsorption device 100 is pressed down, thereby improving reliability.

[0068] In some optional embodiments, the abutment portion 2 is formed with a guide channel connected to the inlet K1. The guide channel gradually increases in size along a second direction Y away from the adsorption body 1, and the second direction Y intersects the first direction X. In other words, in addition to providing the groove 21 at the junction of the adsorption body 1 and the abutment portion 2, the structure of the abutment portion 2 itself can also be adjusted to reduce the difficulty of elastic deformation of the abutment portion 2 along the first direction X.

[0069] Specifically, the abutment portion 2 may have an outer wall surface and an inner wall surface, wherein the size of the guide channel along the second direction Y gradually increases in the direction away from the adsorption body 1. Specifically, the inner wall surface of the abutment portion 2 may be inclined, so that when the negative pressure adsorption device 100 is pressed down, the abutment portion 2 can be guided to deform outward along the second direction Y, reducing the difficulty of deformation, and also making the deformation of the abutment portion 2 more controllable, so as to achieve sealing during the process of pressing down the negative pressure adsorption device 100.

[0070] It can be understood that the groove 21 can be provided only at the junction of the adsorption body 1 and the abutment part 2 to reduce the difficulty of deformation, or the size of the guide channel along the second direction Y can be gradually increased only in the direction away from the adsorption body 1, or the groove 21 can be provided at the junction of the adsorption body 1 and the abutment part 2, so that the size of the guide channel along the second direction Y can be gradually increased in the direction away from the adsorption body 1. The specific setting structure can be adjusted according to the specific structure of the negative pressure adsorption device 100.

[0071] Please refer to Figures 3 to 7. After the elastic switching valve 300 is opened by pressing down the negative pressure adsorption device 100, the inlet K1 of the adsorption body 1 is connected to the injection hole of the battery 200. At this time, in order to make it easier for the gas in the battery 200 to be discharged from the channel 11 of the adsorption body 1, in some optional embodiments, the adsorption body 1 is provided with a groove 121 on the end surface 12 facing the abutting portion 2 in the first direction X. The groove 121 is connected to the inlet K1, and the abutting portion 2 is at least arranged around the outer periphery of the groove 121.

[0072] By providing a groove 121 on the end surface 12 of the adsorption body 1 facing the abutment portion 2 in the first direction X, the groove 121 is located within the flow channel and communicates with the inlet K1. Thus, the groove 121 serves as a confluence, allowing the gas within the flow channel to be channeled through the groove 121 to the inlet K1 of the adsorption body 1, thereby facilitating the confluence and discharge of gas within the battery 200. Furthermore, because the adsorption body 1 is provided with the groove 121, when the negative pressure adsorption device 100 is installed on the battery end cap 210, the positional offset between the negative pressure adsorption device 100 and the battery end cap 210 can be accommodated, making operation more convenient and cost-effective.

[0073] It is understandable that the groove 121 can be configured in various structures.

[0074] Referring to Figure 8 , in some embodiments, multiple grooves 121 are provided, extending radially relative to the inlet K1. The provision of multiple grooves 121 enhances flow convergence and allows for greater compatibility with offset positions of the negative pressure adsorption device 100 and the battery end cap 210, improving applicability.

[0075] When multiple grooves 121 are radially extended relative to the inlet K1, their distribution is more uniform, and confluence can be reliably achieved through the grooves 121. Reliable pressure on the valve body 310 can also be achieved through the adsorption body 1, ensuring that the valve is always kept open during the formation process to achieve a better formation effect.

[0076] Referring to Figures 9 and 10 , in other optional embodiments, the multiple grooves 121 are arranged concentrically with respect to the inlet K1, and two adjacent grooves 121 are interconnected. Specifically, the multiple grooves 121 can be arranged concentrically with respect to the inlet K1 and interconnected to guide the gas flow to the inlet K1 of the adsorption body 1. Furthermore, the adsorption body 1 can also reliably press against the valve body 310, ensuring that the valve remains open during the formation process, thereby achieving a better formation effect.

[0077] After the gas converges to the inlet K1 of the adsorption body 1, it will flow out to the outlet K2 of the adsorption body 1 through the channel 11 of the adsorption body 1. In order to facilitate the discharge of gas from the adsorption body 1, in some optional embodiments, the channel 11 includes a connected first section 111 and a second section 112. The first section 111 is arranged closer to the inlet K1 relative to the second section 112, and the diameter of the first section 111 is smaller than the diameter of the second section 112, so that it is easier to form a negative pressure to quickly discharge the gas from the negative pressure adsorption device 100.

[0078] Optionally, the channel 11 further includes a third section 113, which is connected between the first section 111 and the second section 112. The diameter of the third section 113 is gradually changed from the first section 111 to the second section 112, thereby forming a transition structure between the first section 111 and the second section 112, so as to more reliably realize the discharge of gas in the battery 200 during the formation process.

[0079] An embodiment of the present application also provides a formation system for the formation of a battery 200. The formation system includes a negative pressure source and a negative pressure adsorption device 100. The negative pressure adsorption device 100 is arranged corresponding to the injection hole of the battery 200 to collect the formation exhaust gas of the battery 200. The negative pressure source is connected to the negative pressure adsorption device 100 to provide a negative pressure environment for the negative pressure adsorption device 100.

[0080] Since the formation system in the embodiment of the present application includes the negative pressure adsorption device 100 in the above embodiment, it has the technical effects of the negative pressure adsorption device 100 in the above embodiment, and the same parts are not repeated here. Among them, the negative pressure adsorption device 100 is arranged toward the injection hole of the battery 200, and absorbs the formation exhaust gas of the battery 200 under a negative pressure environment. The negative pressure adsorption device 100 can be directly connected to the negative pressure source or indirectly connected.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A negative pressure adsorption device, comprising: An adsorption body having a channel, an inlet and an outlet communicated with the channel; A contact portion protruding and connected to one side of the adsorption body in a first direction and disposed around the inlet, wherein the height dimension of the contact portion protruding from the adsorption body in the first direction is adjustable.

2. The negative pressure adsorption device according to claim 1, wherein, The contact portion is provided as an elastic material body, and the negative pressure adsorption device includes a first state and a second state; In the first state, the contact portion protrudes from the adsorption body in the first direction by a first distance, and in the second state, the contact portion is in an elastically deformed state, and the contact portion protrudes from the adsorption body in the first direction by a second distance, and the second distance is less than the first distance.

3. The negative pressure adsorption device according to claim 2, wherein, The contact portion and the adsorption body are provided as an integral structure.

4. The negative pressure adsorption device according to claim 3, wherein, A groove is provided at the joint of the adsorption body and the contact portion.

5. The negative pressure adsorption device according to any one of claims 1 to 4, wherein, The contact portion is formed with a diversion channel communicated with the inlet, and in the direction away from the adsorption body, the dimension of the diversion channel in a second direction gradually increases, and the second direction intersects with the first direction.

6. The negative pressure adsorption device according to any one of claims 1 to 5, wherein, A groove is provided on the end surface of the adsorption body facing the contact portion in the first direction, the groove is communicated with the inlet, and the contact portion at least surrounds the outer periphery of the groove.

7. The negative pressure adsorption device according to claim 6, wherein, The number of the grooves is multiple, and the multiple grooves extend radially relative to the inlet; Alternatively, the multiple grooves are distributed in concentric rings relative to the inlet, and adjacent two grooves are communicated with each other.

8. The negative pressure adsorption device according to any one of claims 1 to 7, wherein, The channel includes a first section and a second section connected to each other, the first section is closer to the inlet than the second section, and the diameter of the first section is smaller than the diameter of the second section.

9. The negative pressure adsorption device according to claim 8, wherein, The channel further includes a third section connected between the first section and the second section, and the diameter of the third section is gradually changed in the direction from the first section to the second section.

10. A forming system, comprising the negative pressure adsorption device according to any one of claims 1 to 9.

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