Sucking disc and battery module sucking equipment thereof

Abstract

The utility model provides a suction cup and battery module suction equipment thereof. The suction cup comprises a top cover and a suction cup body, a bottom cover; the first end face of the bottom cover is opposite to the top cover, and the opposite end face of the first end face of the bottom cover is used for being in contact with the battery module; a plurality of sidewalls; one end of each side wall is connected with the top cover, the other end of each side wall is connected with the bottom cover, the top cover, the bottom cover and the side walls are sealed and enclosed to form a closed cavity, and the top cover is provided with a vent hole; the air vent is used for being connected with an external vacuum source so as to reduce the air pressure in the closed cavity through the external vacuum source; a plurality of air holes are formed in the bottom cover at intervals; the plurality of air holes are provided with a plurality of check valves, and the check valves are characterized in that the check valves can be automatically closed when air flow passes through the check valves and exceeds a certain flow speed, so that the exposed sucking disc open holes can be automatically closed, external air cannot enter the sucking disc, other air holes can suck the battery module, and the sucking disc does not need to precisely position the battery module; and the module suction efficiency and the suction safety are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a suction cup and a battery module suction device thereof. Background Art

[0002] In the production of power and energy storage batteries, usually several battery cells are first assembled into a battery module structure, and then several battery modules, a battery box, an electrical assembly, a thermal management assembly and other components are used to form a power battery PACK. Among them, loading the module into the battery box is a key process in the production of the battery PACK.

[0003] The existing assembly scheme usually uses a special sponge suction cup to suck the module into the box. However, since the battery cells in the battery module are bonded by foam, there are gaps between the battery cells. When the current suction cup sucks to the gap between the battery cells, external air will enter the suction cup, resulting in a decrease in the internal vacuum of the suction cup, and then the suction cup cannot suck the module. And when sucking the battery module, the suction holes of the suction cup need to be strictly aligned with the positions of the battery cells, which reduces the packing efficiency of the battery module. Summary of the Utility Model

[0004] The purpose of the embodiments of the present application is to provide a suction cup and a battery module suction device thereof, so as to solve the problem that when the current suction cup sucks the battery module, the suction holes of the suction cup need to be strictly aligned with the positions of the battery cells, resulting in a low packing efficiency of the battery module.

[0005] In a first aspect, the present utility model provides a suction cup, which includes: a top cover; a bottom cover; the first end face of the bottom cover is disposed opposite to the top cover, and the opposite end face of the first end face of the bottom cover is used to contact the battery module; a plurality of side walls; one ends of the plurality of side walls are all connected to the top cover, and the other ends of the plurality of side walls are respectively connected to the bottom cover, and the top cover, the bottom cover and the plurality of side walls are hermetically enclosed to form a sealed cavity; wherein, an air vent is opened on the top cover; the air vent is used to be connected to an external vacuum source to reduce the air pressure in the sealed cavity through the external vacuum source; a plurality of air holes are spaced apart on the bottom cover; a plurality of check valves are arranged on the plurality of air holes, and the check valves are used to close when the flow velocity of the flowing air reaches the rated velocity and open when the flow velocity of the flowing air does not reach the rated velocity.

[0006] For the suction cup designed above, in this solution, a plurality of air holes are opened on the bottom cover of the suction cup, and check valves are added at the plurality of air holes. The characteristic of the check valve is that it can automatically close when the air flow passing through the check valve exceeds a certain flow rate. In this way, when the vacuum source evacuates the gas inside the sealed cavity, the gas flow rate increases. When it is greater than the rated flow rate of the check valve, the exposed check valve automatically closes, preventing external air from entering the suction cup. However, for the suction cup blocked by the battery module, since its air flow is very small and the air flow rate does not reach the rated speed, it remains open. In this way, a vacuum can gradually form in the sealed cavity of the suction cup without other gases entering, and the air holes blocked by the battery module can firmly hold the battery module. Furthermore, the suction cup designed in this solution can firmly adsorb the battery module without precise positioning of the battery module, improving the efficiency and safety of battery module suction.

[0007] In an alternative embodiment of the first aspect, the check valve includes a check valve base body and a check valve diaphragm; an air vent is opened on the check valve base body, and the check valve diaphragm is arranged at the end of the check valve base body; the check valve diaphragm is used to block the air vent on the check valve base body to achieve closure when the air flow rate passing through it reaches the rated speed, and the check valve diaphragm does not block the air vent on the check valve base body to achieve opening when the air flow rate passing through it does not reach the rated speed.

[0008] In the above embodiment, this solution forms a check valve through a simple check valve diaphragm, check valve base body, and air vent opened on the check valve base body, making the check valve structure simple and low-cost.

[0009] In an alternative embodiment of the first aspect, the opening direction of the air vent is the same as the opening direction of the air hole.

[0010] In an alternative embodiment of the first aspect, the number of check valves is the same as the number of air holes, and one check valve is arranged in each air hole.

[0011] In the above embodiment, this solution arranges one check valve in each air hole, so that the opening and closing of the air hole are related to the opening and closing of the check valve, thereby improving the reliability of the opening and closing management of the air hole.

[0012] In an alternative embodiment of the first aspect, the number of check valves is different from the number of air holes. The plurality of air holes include one or more independent air holes and one or more connected air holes. The connected air holes are formed by connecting two air holes and then connecting to the air path. Among them, one check valve is arranged in each independent air hole, and one check valve is arranged on the air path of each connected air hole.

[0013] In the above embodiment, this solution designs the air holes to include independent air holes and connected air holes, enabling one check valve to manage the air flow of the connected air holes connected by two air holes, thereby saving the cost of the check valve.

[0014] In an alternative embodiment of the first aspect, the check valve and the air hole are fixed by threaded connection, or the check valve and the air hole are fixed by snap connection.

[0015] In the above embodiment, the present solution sets the check valve and the air hole to be connected and fixed by means of thread or snap, so that the connection between the check valve and the air hole is a detachable manner, which is convenient for replacing the check valve and improves the reusability of the suction cup.

[0016] In an alternative embodiment of the first aspect, the spacing distance between every two air holes on the bottom cover is the same, and the aperture sizes of the multiple air holes opened on the bottom cover are the same.

[0017] In the above embodiment, the present solution sets the spacing distance of the air holes to be the same and the aperture sizes of the air holes to be the same, so that the suction forces generated by the air holes due to pressure are the same, and further makes the suction force of the suction cup on the battery module more uniform.

[0018] In an alternative embodiment of the first aspect, an elastic member is provided on the opposite end surface of the first end surface of the bottom cover; a plurality of openings are formed in the elastic member, and the plurality of openings formed in the elastic member correspond one-to-one to the plurality of air holes opened in the bottom cover, and the opposite end surface of the first end surface of the bottom cover contacts the battery module through the elastic member.

[0019] In an alternative embodiment of the first aspect, the elastic member includes any one of sponge or rubber.

[0020] In the above embodiment, the present solution provides an elastic member on the contact surface (the opposite end surface of the first end surface) between the bottom cover and the battery module, so that the contact surface between the bottom cover and the battery module becomes more flat through the elastic property of the elastic member, thereby avoiding air leakage between the bottom cover and the battery module and affecting the suction effect of the suction cup, and improving the suction effect of the suction cup and the safety of the battery module.

[0021] In a second aspect, the present utility model provides a battery module suction device, including a suction cup according to any one of the alternative embodiments in the first aspect and a vacuum source, and the vacuum source is connected to the air vent of the top cover of the suction cup to reduce the air pressure in the sealed cavity through the vacuum source.

[0022] The battery module suction device designed above, due to the suction cup described previously, therefore, a check valve is added at multiple air holes in the designed battery module suction device. The characteristic of the check valve is that it can automatically close when the air flow passes through the check valve at a speed exceeding a certain value. In this way, when the vacuum source evacuates the gas inside the sealed cavity, the gas flow rate increases. When it is greater than the rated flow rate of the check valve, the exposed check valve automatically closes, preventing external air from entering the suction cup. And for the suction cup blocked by the battery module, since its air flow is very small and the air flow rate does not reach the rated speed, it remains open. In this way, the sealed cavity of the suction cup can gradually form a vacuum without other gases entering, and the air holes blocked by the battery module can firmly hold the battery module. Furthermore, the suction cup designed in this solution can firmly adsorb the battery module without precise positioning of the battery module, improving the efficiency and safety of battery module suction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0024] Figure 1 The first structural schematic diagram of the suction cup provided by the embodiment of the present application;

[0025] Figure 2 The top view schematic diagram of the check valve provided by the embodiment of the present application;

[0026] Figure 3 The open state structural schematic diagram of the check valve provided by the embodiment of the present application;

[0027] Figure 4 The closed state structural schematic diagram of the check valve provided by the embodiment of the present application;

[0028] Figure 5 The second structural schematic diagram of the suction cup provided by the embodiment of the present application;

[0029] Figure 6 The third structural schematic diagram of the suction cup provided by the embodiment of the present application;

[0030] Figure 7 The structural schematic diagram of the battery module suction device provided by the embodiment of the present application.

[0031] Icons: A - battery module; B - vacuum source; 10 - top cover; 20 - bottom cover; 30 - side wall; 40 - sealed cavity; 50 - vent; 60 - air hole; 610 - independent air hole; 620 - communicating air hole; 70 - check valve; 710 - check valve base; 720 - check valve diaphragm; 730 - vent hole; 80 - elastic member; 810 - opening. Detailed implementation manners

[0032] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0035] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0037] In the description of the embodiments of this application, the term "a plurality of" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of sheets" refers to two or more sheets (including two sheets).

[0038] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0040] In the production of power and energy storage batteries, usually several battery cells are first assembled into a battery module structure, and then a power battery PACK package is composed of several battery modules, a battery box, an electrical assembly, a thermal management assembly and other components. Among them, installing the module into the battery box is a key process in the production of the battery PACK package.

[0041] Existing assembly schemes usually use a special sponge suction cup to suck the module into the box. Since the battery cells in the battery module are bonded by foam and there are gaps between the battery cells, when the current suction cup sucks to the gap between the battery cells, external air will enter the suction cup, resulting in a decrease in the internal vacuum of the suction cup, and then the suction cup cannot suck the module. And when sucking the battery module, the suction holes of the suction cup need to be strictly aligned with the positions of the battery cells, resulting in a low packing efficiency of the battery module.

[0042] Based on the above problems, the present application designs a suction cup and its battery module suction device, and adds a check valve at the suction hole of the suction cup. The characteristic of the check valve is that it can automatically close when the air flow passes through the check valve at a certain flow rate. Therefore, the exposed suction hole of the suction cup can automatically close, preventing external air from entering the suction cup. After the inside of the suction cup forms a vacuum, the remaining air holes can suck the battery module. Furthermore, the suction cup designed in this solution can form a vacuum without precise positioning of the battery module, improving the efficiency and safety of module suction.

[0043] Based on the above idea, the present application first provides a suction cup, such as Figure 1As shown, the suction cup includes a top cover 10, a bottom cover 20, and a plurality of side walls 30. The first end face of the bottom cover 20 is disposed opposite to the top cover 10. The opposite end face of the first end face of the bottom cover 20 is used to contact the battery module A. One ends of the plurality of side walls 30 are all connected to the top cover 10, and the other ends of the plurality of side walls 30 are respectively connected to the bottom cover 20. The top cover 10, the bottom cover 20, and the plurality of side walls 30 are hermetically enclosed to form a sealed cavity 40.

[0044] Among them, please continue to refer to Figure 1 , an air vent 50 is provided on the top cover 10 designed in this solution. The air vent 50 is used to connect to an external vacuum source B ( Figure 1 not shown in the figure). A plurality of air holes 60 are spaced apart on the bottom cover 20. A plurality of check valves 70 are provided in the plurality of air holes 60. The check valve 70 is used to close when the flow rate of the flowing air reaches the rated speed and open when the flow rate of the flowing air does not reach the rated speed.

[0045] For the suction cup designed as above, when sucking the battery module, it can contact the battery module A through the opposite end face of the first end face of the bottom cover 20. The air vent 50 is connected to an external vacuum source B. The vacuum source B pumps out the gas inside the sealed cavity 40. In this case of pumping out the gas, the check valve 70 in the air hole 60 aligned with the battery module A is blocked by the battery module A. The air flow through the blocked check valve 70 (such as check valve 70A) is very small and the air flow rate does not reach the rated speed. Therefore, the check valve 70 in the air hole 60 blocked by the battery module A cannot close and remains open; the external air flow mainly passes through the check valve 70 (such as check valve 70B) in the air hole 60 aligned with the gap between the battery cells of the battery module A and the check valve 70 (such as check valve 70C) in the exposed air hole. When the air flow rate reaches the rated speed, the check valve 70 (such as check valve 70B) in the air hole 60 aligned with the gap between the battery cells of the battery module A and the check valve 70 (such as check valve 70C) in the exposed air hole close, so that the external air flow cannot enter the sealed cavity 40. In this way, after the gas inside the sealed cavity 40 is pumped out by the vacuum source B, a vacuum negative pressure is gradually formed in the sealed cavity 40, so that the air hole of the check valve 70 (such as 70A) that remains open firmly sucks the battery module A, realizing the suction of the battery module.

[0046] For the suction cup designed above, in this solution, a plurality of air holes are opened on the bottom cover of the suction cup, and check valves are added at the plurality of air holes. The characteristic of the check valve is that it can automatically close when the air flow passing through the check valve exceeds a certain flow rate. In this way, when the vacuum source evacuates the gas inside the sealed cavity, the gas flow rate increases. When it is greater than the rated flow rate of the check valve, the exposed check valve automatically closes, preventing external air from entering the suction cup. However, for the suction cup blocked by the battery module, since its air flow is very small and the air flow rate does not reach the rated speed, it remains open. In this way, a vacuum can gradually form in the sealed cavity of the suction cup without other gases entering, and the air holes blocked by the battery module can firmly hold the battery module. Therefore, the suction cup designed in this solution can firmly adsorb the battery module without precise positioning of the battery module, improving the efficiency and safety of sucking the battery module.

[0047] In an alternative embodiment of this embodiment, as shown in Figure 2 is a top view structural schematic diagram of the check valve. As shown in Figure 3 is a structural schematic diagram of the check valve in the open state. As shown in Figure 4 is a structural schematic diagram of the check valve in the closed state. The check valve 70 designed in this solution may include a check valve base body 710 and a check valve diaphragm 720. An air vent 730 is opened on the check valve base body 710, and the check valve diaphragm 720 is arranged at the end of the check valve base body 710.

[0048] For the check valve 70 designed above, the check valve diaphragm 720 blocks the air vent 730 on the check valve base body 710 when the air flow rate passing through it reaches the rated speed to achieve the closing of the check valve; the check valve diaphragm 720 does not block the air vent 730 on the check valve base body 710 when the air flow rate passing through it does not reach the rated speed to achieve the opening of the check valve, that is, the check valve diaphragm 720 can maintain a tilted state under normal conditions. Among them, the check valve 70 can be made of plastic or other polymer materials. Specifically, the check valve 70 can be manufactured by integral injection molding.

[0049] In the above embodiment, this solution forms a check valve through a simple check valve diaphragm, check valve base body, and air vent opened on the check valve base body, making the check valve structure simple and low-cost.

[0050] In an alternative embodiment of this embodiment, please continue to refer to Figure 1 , the opening direction of the air vent 730 on the check valve base body 710 designed in this solution is the same as the opening direction of the air hole 60 opened on the bottom cover 20.

[0051] In an alternative embodiment of this embodiment, as a possible implementation, please continue to refer to Figure 1, the number of check valves 70 designed in this solution is the same as the number of air holes 60 opened on the bottom cover 20. In this case, one check valve 70 is arranged in each air hole 60 designed in this solution.

[0052] In an alternative embodiment of this embodiment, as another possible implementation, please refer to Figure 5 , the number of check valves 70 designed in this solution may be different from the number of air holes 60 opened on the bottom cover 20. Specifically, the multiple air holes 60 opened in this solution include one or more independent air holes 610 and one or more connected air holes 620. The connected air holes 620 are formed by connecting two air holes 60 and then connecting to the air path. Among them, one check valve 70 is arranged in each independent air hole 610, and one check valve 70 is arranged on the air path of each connected air hole 620.

[0053] In the above embodiment, the air holes designed in this solution include independent air holes and connected air holes, so that one check valve can manage the air flow of the connected air holes connected by two air holes, thereby saving the cost of the check valve.

[0054] In an alternative embodiment of this embodiment, as a possible implementation, the check valve 70 designed in this solution and the air hole 60 can be fixed by screw connection. Specifically, a first thread is provided in the air hole 60 designed in this solution, and a second thread is provided on the check valve base 710 of the check valve 70, so that the check valve 70 can be connected to the air hole 60 by the cooperation of the first thread and the second thread.

[0055] In an alternative embodiment of this embodiment, as another possible implementation, the check valve 70 of this solution and the air hole can be connected and fixed by a snap connection. Specifically, the radius of the check valve base 710 designed in this solution can be slightly larger than the aperture of the air hole 60, so that the check valve can be connected and fixed to the air hole 60 by the check valve base 710 being clamped in the air hole 60.

[0056] In the above embodiment, this solution sets the check valve and the air hole to be connected and fixed by screw or snap connection, so that the connection between the check valve and the air hole is a detachable method, which is convenient for replacing the check valve and improves the reusability of the suction cup.

[0057] In an alternative embodiment of this embodiment, please continue to refer to Figure 1 , for the uniformity of the suction force of the suction cup, the interval distance between every two air holes 60 on the bottom cover 20 designed in this solution can be the same, and the aperture sizes of the multiple air holes 60 opened on the bottom cover 20 are the same, so that the suction forces generated by the air holes due to pressure are the same, and further the suction force of the suction cup on the battery module is more uniform.

[0058] In an alternative embodiment of this embodiment, as Figure 6As shown, an elastic member 80 is provided on the opposite end face of the first end face of the bottom cover 20 of the present design, and a plurality of openings 810 are provided on the elastic member 80. The plurality of openings 810 provided on the elastic member 80 correspond one-to-one to the plurality of air holes 60 provided on the bottom cover 20, that is, the positions of the openings 810 on the elastic member 80 are consistent with the positions of the air holes 60, thereby preventing the elastic member from blocking the airflow, and the opposite end face of the first end face of the bottom cover 20 contacts the battery module A through the elastic member 80.

[0059] The elastic member 80 of the present invention is made of sponge or rubber.

[0060] In the above embodiment, this scheme arranges an elastic member on the contact surface between the bottom cover 20 and the battery module A (the end surface opposite to the first end surface), so that the contact surface between the bottom cover 20 and the battery module A becomes more reliable through the elastic property of the elastic member, thereby avoiding the formation of air leakage between the bottom cover 20 and the battery module A that affects the suction effect of the suction cup, thereby improving the suction effect of the suction cup and the safety of the battery module A.

[0061] The present application also provides a battery module suction device, such as Figure 7 As shown, the battery module suction device includes a suction cup of any optional embodiment described above and a vacuum source B, the vacuum source B is connected to the vent 50 of the top cover 10 of the suction cup, the vacuum source B can extract the gas in the closed cavity 40, reduce the air pressure in the closed cavity, and thus form a vacuum negative pressure in the closed cavity 40.

[0062] The battery module suction device designed above includes the suction cup described above, so the designed battery module suction device adds check valves at multiple air holes. The characteristic of the check valve is that it can automatically close when the air flow exceeds a certain flow rate through the check valve. In this way, when the vacuum source draws out the gas inside the closed cavity, the gas flow rate increases. When it is greater than the rated flow rate of the check valve, the exposed check valve automatically closes, so that outside air cannot enter the suction cup. The suction cup blocked by the battery module remains open because its air flow is very small and the air flow cannot reach the rated speed. In this way, the closed cavity of the suction cup can gradually form a vacuum without other gas entering. The air holes blocked by the battery module can stably absorb the battery module, so that the suction cup designed in this scheme can firmly adsorb the battery module without the need for precise positioning of the battery module, thereby improving the efficiency and safety of battery module suction.

[0063] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A suction cup, characterized in that: The suction cup comprises: Top cover; Bottom cover; the first end surface of the bottom cover is arranged opposite to the top cover, and the opposite end surface of the first end surface of the bottom cover is used to contact the battery module; A plurality of side walls; one end of each of the plurality of side walls is connected to the top cover, and the other ends of each of the plurality of side walls are connected to the bottom cover respectively, and the top cover, the bottom cover and the plurality of side walls are sealed and enclosed to form a closed cavity; Wherein, a vent is provided on the top cover; the vent is used to connect to an external vacuum source so as to reduce the air pressure in the closed cavity through the external vacuum source; The bottom cover is provided with a plurality of air holes at intervals; the plurality of air holes are provided with a plurality of check valves, and the check valves are used to close when the speed of the air flow reaches a rated speed, and to open when the air flow does not reach the rated speed.

2. The suction cup according to claim 1, characterized in that The check valve comprises a check valve base and a check valve diaphragm; The check valve base is provided with a vent hole, and the check valve diaphragm is arranged at the end of the check valve base; The check valve diaphragm is used to cover the vent hole on the check valve base to achieve closure when the air flow velocity through it reaches the rated velocity, and to open the check valve diaphragm by not covering the vent hole on the check valve base when the air flow velocity through it does not reach the rated velocity.

3. The suction cup according to claim 2, characterized in that The opening direction of the vent hole is consistent with the opening direction of the air hole.

4. The suction cup according to claim 1, characterized in that The number of the check valves is the same as the number of the air holes, and a check valve is arranged in each air hole.

5. The suction cup according to claim 1, characterized in that The number of the check valves is different from the number of the air holes. The multiple air holes include one or more independent air holes and one or more connecting air holes. The connecting air holes are connected to the air path after two air holes are connected. A check valve is arranged in each of the independent air holes, and a check valve is arranged on the air path of each connecting air hole.

6. The suction cup according to claim 1, characterized in that The check valve and the air hole are fixed by threaded connection, or the check valve and the air hole are fixed by buckle connection.

7. The suction cup according to claim 1, characterized in that The spacing distance between every two air holes on the bottom cover is the same, and the aperture sizes of the multiple air holes opened on the bottom cover are the same.

8. The suction cup according to claim 1, characterized in that An elastic member is disposed on the end surface opposite to the first end surface of the bottom cover; The elastic member is provided with a plurality of openings, which correspond one-to-one to the plurality of air holes provided on the bottom cover, and the opposite end surface of the first end surface of the bottom cover contacts the battery module through the elastic member.

9. The suction cup according to claim 8, characterized in that The elastic member includes any one of sponge or rubber.

10. A battery module suction device, characterized in that: The battery module suction device comprises the suction cup according to any one of claims 1 to 9 and a vacuum source, wherein the vacuum source is connected to the vent of the top cover of the suction cup so as to reduce the air pressure in the closed cavity through the vacuum source.

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