Plug device and electric device

Abstract

The utility model discloses a plug device and an electric device, and belongs to the field of batteries. The plugging device comprises a plugging body and a plugging piece, the plugging body is provided with a plurality of plugging holes, the plugging holes are used for installing low-voltage plugging pieces, the low-voltage plugging pieces are electrically connected with built-in plugging pieces of the battery pack, and the plugging holes comprise at least one vacant hole; at least part of the plugging piece is located in the vacant hole; wherein the plugging member is provided with a first position and a second position relative to the vacant hole, the plugging member and the vacant hole are spaced to form an inflation channel at the first position, the inflation channel is communicated with the battery pack to perform airtightness detection on the battery pack, and the vacant hole is plugged by the plugging member at the second position. A special air inlet hole does not need to be designed in the battery pack for air tightness detection, the air tightness of the battery pack is improved, and the design cost of the battery pack can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a plugging device and an electrical device. Background Art

[0002] Currently, low-voltage connectors in the market play the function of connecting low-voltage signals. The operating conditions of low-voltage connectors require a certain level of waterproofing. When low-voltage connectors are applied to battery packs, due to the enclosed environment inside the battery pack and the high sealing requirements for the battery pack, it is necessary to conduct airtightness detection during the production of the battery pack, and all components need to be sealed. In related technologies, in order to conduct airtightness detection on the battery pack, it is necessary to design special air inlet holes and sealing plugs for blocking the air inlet holes on the battery pack, which increases the usage risk of the battery pack and reduces the structural strength of the battery pack. Summary of the Utility Model

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a plugging device and an electrical device, which do not require designing special air inlet holes on the battery pack for airtightness detection, can improve the airtightness of the battery pack and reduce the design cost of the battery pack.

[0004] In a first aspect, this application provides a plugging device applied to a battery pack, including:

[0005] A plugging body, on which a plurality of plugging holes are provided. The plurality of plugging holes are used for installing low-voltage plugging parts, and the low-voltage plugging parts are electrically connected to the built-in plugging parts of the battery pack. The plurality of plugging holes include at least one empty hole;

[0006] A plugging member, at least part of which is located in the empty hole;

[0007] Wherein, the plugging member has a first position and a second position relative to the empty hole. In the first position, the plugging member and the empty hole form an inflation channel at an interval, and the inflation channel is communicated with the battery pack to conduct airtightness detection on the battery pack. In the second position, the empty hole is blocked by the plugging member.

[0008] According to the plugging device of the present application, a plugging member can be assembled in an empty hole among a plurality of plugging holes of the plugging body. When the plugging member is in the first position relative to the empty hole, the plugging member opens the empty hole, and an air inflation channel is formed between the plugging member and the empty hole. The air inflation channel is communicated with the battery pack, and the airtightness of the battery pack can be detected through the air inflation channel, so that there is no need to design a special air inlet hole on the battery pack, which not only improves the airtightness of the battery pack but also reduces the design cost of the battery pack. At the same time, it also avoids introducing a sealing plug for plugging the air inlet hole, which can reduce the use risk of the battery pack and improve the structural strength of the battery pack; when the plugging member is in the second position relative to the empty hole, the empty hole is plugged by the plugging member, and the empty hole is sealed to improve the sealing performance of the connection between the plugging device and the battery pack.

[0009] According to an embodiment of the present application, the plugging member includes a plug head and a pull rod, and at least part of the outer diameter of the plug head is greater than the inner diameter of the empty hole;

[0010] In the first position, the plug head is located outside the empty hole, and the pull rod forms the air inflation channel with a gap from the empty hole and extends out of the empty hole. In the second position, at least part of the plug head is located inside the empty hole to plug the empty hole.

[0011] According to an embodiment of the present application, the connection strength between the plug head and the pull rod is lower than a target value.

[0012] According to an embodiment of the present application, the plug head is provided with a plugging portion and a guiding portion along the insertion direction. The outer diameter of the plugging portion is greater than the inner diameter of the empty hole, and the outer diameter of the guiding portion monotonically decreases from the end close to the plugging portion to the end far from the plugging portion.

[0013] According to an embodiment of the present application, at least one convex ring is provided on the outer surface of the plugging portion. The convex ring protrudes from the outer surface of the plugging portion. In the second position, at least part of the plugging portion is located inside the empty hole and the convex ring is in interference fit with the empty hole.

[0014] According to an embodiment of the present application, a limiting protrusion is provided at one end of the plugging portion close to the battery pack. The outer diameter of the limiting protrusion is greater than the inner diameter of the empty hole.

[0015] According to an embodiment of the present application, the pull rod is provided with a limiting block, and the distance of the widest part of the limiting block is greater than the aperture of the outer end of the empty hole.

[0016] According to an embodiment of the present application, the limiting block is a wedge body. The bottom surface of the limiting block is connected to the body of the pull rod, and the top end of the limiting block is close to the plug head.

[0017] According to an embodiment of the present application, the aperture diameter of the outer end of the empty hole is smaller than the aperture diameter of the inner end of the empty hole.

[0018] In a second aspect, the present application provides an electrical device, including a battery pack and the plugging device described in any one of the above, and the battery pack is connected to the plugging device.

[0019] According to the electrical device provided by the embodiment of the present application, by providing the above plugging device, a plugging member can be assembled in an empty hole among a plurality of plugging holes of the plugging body. When the plugging member is in the first position relative to the empty hole, the plugging member opens the empty hole, and an air inflation channel is formed between the plugging member and the empty hole. The air inflation channel is connected to the battery pack, and the air tightness of the battery pack can be detected through the air inflation channel. Thus, there is no need to design a special air inlet hole on the battery pack, which can not only improve the air tightness of the battery pack but also reduce the design cost of the battery pack. At the same time, it also avoids introducing a sealing plug for plugging the air inlet hole, which can reduce the use risk of the battery pack and improve the structural strength of the battery pack. When the plugging member is in the second position relative to the empty hole, the empty hole is plugged by the plugging member, and the empty hole is sealed to improve the sealing performance of the connection between the plugging device and the battery pack.

[0020] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0021] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0022] Figure 1 is one of the structural schematic diagrams of the electrical device provided by the embodiment of the present application;

[0023] Figure 2 is one of the structural schematic diagrams of the plugging device provided by the embodiment of the present application;

[0024] Figure 3 is the second structural schematic diagram of the plugging device provided by the embodiment of the present application;

[0025] Figure 4 is the second structural schematic diagram of the electrical device provided by the embodiment of the present application;

[0026] Figure 5 is the third structural schematic diagram of the plugging device provided by the embodiment of the present application;

[0027] Figure 6 is the fourth structural schematic diagram of the plugging device provided by the embodiment of the present application;

[0028] Figure 7It is a schematic structural diagram of a plugging member provided by an embodiment of the present application;

[0029] Figure 8 It is a schematic structural diagram of a plug provided by an embodiment of the present application;

[0030] Figure 9 It is Figure 7 a partial enlarged view of part A in

[0031] Figure 10 a schematic structure of a plugging body provided by an embodiment of the present application.

[0032] Reference numerals:

[0033] Plugging device 1, plugging body 11, plugging holes 111, low-voltage plugging members 112, empty holes 113, plugging member 114, plug 1141, plugging part 11411, guiding part 11412, convex ring 11413, limiting protrusion 11414, pull rod 1142, limiting block 11421; battery pack 2. Detailed implementation manners

[0034] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0035] The following refers to Figures 1 - 10 describe a plugging device 1 and an electrical device according to an embodiment of the present application.

[0036] As Figure 1 , Figure 2 and Figure 3 shown, the plugging device 1 of the embodiment of the present application is applied to the battery pack 2 and includes: a plugging body 11 and a plugging member 114. A plurality of plugging holes 111 are provided on the plugging body 11. The plurality of plugging holes 111 are used to install low-voltage plugging members 112. The low-voltage plugging members 112 are electrically connected to the built-in plugging members of the battery pack 2. The plurality of plugging holes 111 include at least one empty hole 113; at least a part of the plugging member 114 is located in the empty hole 113.

[0037] Among them, the plugging member 114 has a first position and a second position relative to the empty hole 113. In the first position, as Figure 4 shown, the plugging member 114 and the empty hole 113 are spaced apart to form an inflation channel, and the inflation channel is communicated with the battery pack 2 to perform an airtight detection on the battery pack 2. In the second position, as Figure 5 and Figure 6 shown, the empty hole 113 is plugged by the plugging member 114.

[0038] In this embodiment, as Figure 10 shown, a plurality of insertion holes 111 are provided on the insertion body 11. When the plurality of insertion holes 111 are empty, they are all communicated with the battery pack 2. The insertion holes 111 are used to install low-voltage connectors 112, and the low-voltage connectors 112 are electrically connected to the built-in connectors of the battery pack 2. When a low-voltage connector 112 or a plugging member 114 is installed in the insertion hole 111, the insertion hole 111 is sealed to improve the sealing performance of the connection between the insertion device 1 and the battery pack 2, as well as the waterproof sealing effect of the insertion device 1.

[0039] Among them, the insertion body 11 can be an insertion component in the related art, or an insertion component specially designed according to the structure of the battery pack.

[0040] Before the insertion device 1 is inserted into the battery pack 2, the plugging member 114 is assembled with the insertion body 11. The plugging member 114 can move in the empty hole 113 to block or open the empty hole 113. When the plugging member 114 is in the first position relative to the empty hole 113, as Figure 4 shown, the plugging member 114 opens the empty hole 113, and an air inflation channel is formed between the plugging member 114 and the empty hole 113. The air inflation channel is communicated with the battery pack 2, and the airtightness of the battery pack 2 can be detected through the air inflation channel, so that there is no need to design a special air inlet hole on the battery pack; as Figure 5 and Figure 6 shown, when the plugging member 114 is in the second position relative to the empty hole 113, the empty hole 113 is blocked by the plugging member 114, and the empty hole 113 is sealed to improve the sealing performance of the connection between the insertion device 1 and the battery pack 2.

[0041] According to the insertion device 1 provided by the embodiment of the present application, a plugging member 114 can be assembled in an empty hole 113 among a plurality of insertion holes 111 of the insertion body 11. When the plugging member 114 is in the first position relative to the empty hole 113, the plugging member 114 opens the empty hole 113, and an air inflation channel is formed between the plugging member 114 and the empty hole 113. The air inflation channel is communicated with the battery pack 2, and the airtightness of the battery pack 2 can be detected through the air inflation channel, so that there is no need to design a special air inlet hole on the battery pack 2, which not only improves the airtightness of the battery pack 2 but also reduces the design cost of the battery pack 2. At the same time, it also avoids introducing a sealing plug for plugging the air inlet hole, which can reduce the use risk of the battery pack 2 and improve the structural strength of the battery pack 2; when the plugging member 114 is in the second position relative to the empty hole 113, the empty hole 113 is blocked by the plugging member 114, and the empty hole 113 is sealed to improve the sealing performance of the connection between the insertion device 1 and the battery pack 2.

[0042] In some embodiments, as Figure 7As shown, the plugging member 114 includes a plug 1141 and a pull rod 1142. At least part of the outer diameter of the plug 1141 is larger than the inner diameter of the empty hole 113; as Figure 4 shown, in the first position, the plug 1141 is located outside the empty hole 113, and an inflation channel is formed by the interval between the pull rod 1142 and the inner wall of the empty hole 113, and the outer end of the pull rod 1142 extends out of the empty hole 113. In the second position, as Figure 5 and Figure 6 shown, at least part of the plug 1141 is located inside the empty hole 113 to plug the empty hole 113.

[0043] In this embodiment, the plug 1141 can be an elastic member such as rubber, and the pull rod 1142 can be a plastic rod, a metal rod or a wooden rod.

[0044] At least part of the outer diameter of the plug 1141 is larger than the inner diameter of the empty hole 113. When the plug 1141 is fully inserted into the empty hole 113, it can be in interference fit with the empty hole 113 to effectively plug the empty hole 113.

[0045] The pull rod 1142 is connected to the plug 1141. In the first position, as Figure 4 shown, the plug 1141 is located outside the empty hole 113, which is convenient for moving the position of the plug 1141 inside and outside the empty hole 113. The pull rod 1142 and the plug 1141 can be connected by connection methods such as gluing, clamping or threaded connection.

[0046] In the first position, the plugging member 114 allows the battery pack 2 to perform a hermeticity test; in the second position, the plugging member 114 plugs the empty hole 113 to ensure the sealing of the battery pack 2 and reduce gas leakage.

[0047] In some embodiments, the connection strength between the plug 1141 and the pull rod 1142 is lower than the target value.

[0048] In this embodiment, the plug 1141 and the pull rod 1142 can be connected by connection methods such as clamping or gluing.

[0049] During normal use of the plug 1141 and the pull rod 1142, the plug 1141 and the pull rod 1142 are connected. By applying a force to the pull rod 1142, the position of the plug 1141 relative to the empty hole 113 can be controlled. In the case where the hermeticity test of the battery pack 2 is completed, as Figure 5 shown, a force is applied to the pull rod 1142 to pull the plug 1141 into the empty hole 113 to plug the empty hole 113. The plug 1141 is in interference fit with the empty hole 113, and the force applied to the pull rod 1142 is continuously increased to the target value, as Figure 6As shown, the plug 1141 and the pull rod 1142 are separated. The plug 1141 remains in the empty hole 113 to block the empty hole 113, and the pull rod 1142 is taken out. This can not only achieve the blocking of the empty hole 113 but also avoid the part of the pull rod 1142 outside the empty hole 113 from affecting the subsequent plugging operation of the plugging device 1.

[0050] In some embodiments, as Figure 8 shown, the plug 1141 is provided with a blocking portion 11411 and a guiding portion 11412 along the insertion direction. The outer diameter of the blocking portion 11411 is larger than the inner diameter of the empty hole 113, and the outer diameter of the guiding portion 11412 monotonically decreases from the end close to the blocking portion 11411 to the end far from the blocking portion 11411.

[0051] In this embodiment, the outer diameter of the blocking portion 11411 is larger than the inner diameter of the empty hole 113. When the blocking portion 11411 is inserted into the empty hole 113, the blocking portion 11411 is in interference fit with the empty hole 113, and the blocking portion 11411 can effectively block the empty hole 113 and reduce gas or liquid leakage.

[0052] The guiding portion 11412 is used to guide the blocking portion 11411 to smoothly insert into the empty hole 113. The outer diameter of the guiding portion 11412 monotonically decreases from the end close to the blocking portion 11411 to the end far from the blocking portion 11411, which can reduce the frictional force when the blocking portion 11411 is inserted, making the blocking portion 11411 easier and more accurate to be pushed into the empty hole 113. At the same time, it can provide a smooth transition and reduce the damage to the inner wall of the empty hole 113.

[0053] In some embodiments, as Figure 8 shown, at least one convex ring 11413 is provided on the outer surface of the blocking portion 11411. The convex ring 11413 protrudes from the outer surface of the blocking portion 11411. In the second position, at least part of the blocking portion 11411 is located in the empty hole 113 and the convex ring 11413 is in interference fit with the empty hole 113.

[0054] One or more convex rings 11413 are provided on the outer surface of the blocking portion 11411. The multiple convex rings 11413 can be closely arranged or spaced apart along the insertion direction on the outer surface of the blocking portion 11411. The convex ring 11413 protrudes from the outer surface of the blocking portion 11411. In the case where the blocking portion 11411 blocks the empty hole 113, the convex ring 11413 is in interference fit with the empty hole 113 to increase the sealing effect.

[0055] In some embodiments, as Figure 8 shown, a limiting protrusion 11414 is provided at the end of the blocking portion 11411 close to the battery pack 2. The outer diameter of the limiting protrusion 11414 is larger than the inner diameter of the empty hole 113.

[0056] One end of the plugging part 11411 close to the battery pack 2 is provided with a limiting protrusion 11414. When the plugging part 11411 is pulled into the empty hole 113 by applying a force to the pull rod 1142, since the outer diameter of the limiting protrusion 11414 is greater than the inner diameter of the empty hole 113, the friction force between the limiting protrusion 11414 and the empty hole 113 increases. When the force applied to the pull rod 1142 is equal to or greater than the target value, the pull rod 1142 can be separated from the plug 1141, the pull rod 1142 is pulled out of the empty hole 113, and the plug 1141 remains in the empty hole 113 to plug the empty hole 113.

[0057] As Figure 8 shown, the limiting protrusion 11414 can be an annular structure. The limiting protrusion 11414 is arranged at the end of the plugging part 11411, and the outer diameter of the limiting protrusion 11414 is greater than the outer diameter of the convex ring 11413.

[0058] In some embodiments, as Figure 7 and Figure 9 shown, the pull rod 1142 is provided with a limiting block 11421, and the width of the widest part of the limiting block 11421 is greater than the aperture of the outer end of the empty hole 113.

[0059] In this embodiment, the limiting block 11421 is located at the part of the pull rod 1142 away from the plug 1141. During the process of assembling the plugging member 114 with the empty hole 113, first insert the pull rod 1142 into the empty hole 113 from one end of the empty hole 113 close to the battery pack 2. When the limiting block 11421 reaches the outer end of the empty hole 113, a little more force can be used to pull the limiting block 11421 out of the outer end of the empty hole 113.

[0060] By setting the limiting block 11421, the movement of the pull rod 1142 in the direction towards the battery pack 2 can be limited, preventing the plugging member 114 from falling into the battery pack 2 from the empty hole 113.

[0061] As Figure 4 、 Figure 5 and Figure 6 shown, the tail end of the pull rod 1142 extends out from one end of the empty hole 113 away from the battery pack 2. During the airtightness detection process, the plug 1141 is located outside the empty hole 113, and an air inflation channel is formed at an interval between the pull rod 1142 and the empty hole 113; after the airtightness detection is completed, pull the pull rod 1142 in the direction away from the battery pack 2, the plug 1141 is pulled into the empty hole 113, continue to apply a pulling force to the pull rod 1142, when the acting force reaches the target value, the pull rod 1142 is separated from the plug 1141, the plug 1141 is left in the empty hole 113 to plug the empty hole 113, and the pull rod 1142 is pulled out.

[0062] In some embodiments, Figure 9 As shown, the limit block 11421 is a wedge, the bottom surface of the limit block 11421 is connected to the body of the pull rod 1142 , and the top end of the limit block 11421 approaches the plug 1141 .

[0063] Among them, the limit block 11421 is a wedge, and both side surfaces of the wedge are inclined toward the direction of the plug 1141, that is, the upper surface of the wedge facing away from the plug 1141 forms an obtuse angle with the outer surface of the pull rod 1142, so as to facilitate the pull rod 1142 to be pulled out from the outer end of the vacant hole 113, and the lower surface of the wedge facing the plug 1141 forms an acute angle with the outer surface of the pull rod 1142, so as to reduce the pull rod 1142 from falling from the outer end of the vacant hole 113 toward the direction close to the battery pack 2.

[0064] In some embodiments, Figure 10 As shown, the hole diameter of the outer end of the vacant hole 113 is smaller than the hole diameter of the inner end of the vacant hole 113 .

[0065] Among them, the end of the empty hole 113 close to the battery pack 2 is the inner end, and the end of the empty hole 113 away from the battery pack 2 is the inner end. The aperture of the outer end of the empty hole 113 is smaller than the aperture of the inner end of the empty hole 113 to facilitate inflation and the assembly of the low-voltage connector 112 and the plug hole 111.

[0066] The vacant hole 113 may be tapered as a whole, or a portion of the vacant hole 113 close to the battery pack 2 may be cylindrical, and a portion of the vacant hole 113 away from the battery pack 2 may be tapered.

[0067] In some embodiments, the plug-in body 11 is provided with an inner plug and an outer plug, and an installation skirt is provided between the inner plug and the outer plug. The wall surface of the installation skirt facing the inner plug is used to fit with the outer wall of the battery pack 2. The installation skirt is detachably connected to the battery pack 2. The inner plug is used to extend into the interior of the battery pack 2 and electrically connect with the built-in connector of the battery pack 2. The external plug is located on the outside of the battery pack 2 and is used to connect with the plug of the power extraction device.

[0068] The plug hole 111 passes through the inner plug and the outer plug, the plug 1141 of the blocking member 114 faces the inner plug, and the pull rod 1142 of the blocking member 114 faces the outer plug.

[0069] like Figure 1 As shown, an embodiment of the present application further provides an electrical device, comprising a battery pack 2 and the plug-in device 1 in any of the above embodiments, wherein the battery pack 2 is connected to the plug-in device 1 .

[0070] The battery pack 2 is provided with an opening, which is plugged into and matched with the plug-in device 1 .

[0071] According to the electrical device provided by the embodiments of the present application, by providing the above-mentioned plugging device 1, a plugging member 114 can be assembled in one of the plurality of plugging holes 111 of the plugging body 11, namely an empty hole 113. When the plugging member 114 is in the first position relative to the empty hole 113, the plugging member 114 opens the empty hole 113, and an air inflation channel is formed between the plugging member 114 and the empty hole 113. The air inflation channel is communicated with the battery pack 2, and the airtightness of the battery pack 2 can be detected through the air inflation channel. Thus, there is no need to design a dedicated air inlet hole on the battery pack 2, which not only improves the airtightness of the battery pack 2 but also reduces the design cost of the battery pack 2. At the same time, it also avoids introducing a sealing plug for plugging the air inlet hole, which can reduce the usage risk of the battery pack 2 and improve the structural strength of the battery pack 2. When the plugging member 114 is in the second position relative to the empty hole 113, the empty hole 113 is plugged by the plugging member 114, and the empty hole 113 is sealed to improve the sealing performance of the connection between the plugging device 1 and the battery pack 2.

[0072] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0073] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "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, and is only for the convenience of describing 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 thus should not be construed as a limitation of the present application.

[0074] In the description of the present application, the "first feature", "second feature" may include one or more of such features.

[0075] In the description of the present application, "a plurality of" means two or more.

[0076] In the description of the present application, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween.

[0077] In the description of the present application, the first feature being "above", "over" or "on top of" the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0078] In the description of this specification, descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0079] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A plug-in device, applied to a battery pack, characterized in that: include: A plug body, wherein a plurality of plug holes are provided on the plug body, wherein the plurality of plug holes are used to install a low-voltage plug connector, wherein the low-voltage plug connector is electrically connected to a built-in plug connector of the battery pack, and wherein the plurality of plug holes include at least one vacant hole; a blocking member, at least a portion of which is located in the vacant hole; The blocking member has a first position and a second position relative to the vacant hole. In the first position, the blocking member is spaced apart from the vacant hole to form an air passage, and the air passage is connected to the battery pack to perform an airtightness test on the battery pack. In the second position, the vacant hole is blocked by the blocking member.

2. The plug-in device according to claim 1, characterized in that: The blocking member includes a plug and a pull rod, and at least a portion of the outer diameter of the plug is larger than the inner diameter of the vacant hole; In the first position, the plug is located outside the empty hole, the pull rod is spaced apart from the empty hole to form the inflation passage and extends out of the empty hole, and in the second position, at least a portion of the plug is located in the empty hole to block the empty hole.

3. The plug-in device according to claim 2, characterized in that: The connection strength between the plug and the pull rod is lower than a target value.

4. The plug-in device according to claim 2, characterized in that: The plug is provided with a blocking portion and a guiding portion along the insertion direction, the outer diameter of the blocking portion is larger than the inner diameter of the vacant hole, and the outer diameter of the guiding portion decreases monotonically from one end close to the blocking portion to one end far from the blocking portion.

5. The plug-in device according to claim 4, characterized in that: The outer surface of the blocking portion is provided with at least one convex ring, which protrudes from the outer surface of the blocking portion. In the second position, at least part of the blocking portion is located in the vacant hole and the convex ring is interference fit with the vacant hole.

6. The plug-in device according to claim 4, characterized in that: A limiting protrusion is provided at one end of the blocking portion close to the battery pack, and the outer diameter of the limiting protrusion is greater than the inner diameter of the vacant hole.

7. The plug-in device according to claim 2, characterized in that: The pull rod is provided with a limit block, and the widest distance of the limit block is greater than the hole diameter of the outer end of the vacant hole.

8. The plug-in device according to claim 7, characterized in that: The limit block is a wedge, the bottom surface of the limit block is connected to the body of the pull rod, and the top end of the limit block is close to the plug.

9. The plug-in device according to any one of claims 1 to 8, characterized in that: The hole diameter of the outer end of the vacant hole is smaller than the hole diameter of the inner end of the vacant hole.

10. An electrical device, characterized in that: The invention comprises a battery pack and the plug-in device according to any one of claims 1 to 9, wherein the battery pack is connected to the plug-in device.

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