Air tightness detection structure and battery vacuum detection device

Abstract

The utility model belongs to the technical field of battery detection, and particularly relates to an air tightness detection structure and a battery vacuum detection device. The air tightness detection structure comprises a locking part, a detection head and a cylinder. A flow guide cavity is formed in the cylinder body; the detection head is arranged between the locking part and the cylinder body; the locking part is connected to the cylinder body; a mounting cavity is formed in the locking part; the detection head is detachably connected into the mounting cavity and penetrates through the locking component; a detection cavity is formed in the detection head; and the detection cavity is communicated with the flow guide cavity. According to the utility model, the compactness and simplicity of the structure can be improved; and the detection speed can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery detection, and particularly relates to an airtightness detection structure and a battery vacuum detection device. Background Art

[0002] Power batteries generally include a metal shell, battery cells and electrolytes accommodated in the metal shell, and a top cover welded to the metal shell. During the production process of power batteries, in order to ensure the safety of the batteries, airtightness detection is generally required. The airtightness detection process of power batteries is as follows: before welding the injection hole of the battery, pure helium is injected into the battery, a sealing nail is inserted, and the injection hole is welded. The battery to be tested is placed in a sealed cavity, the sealed cavity is evacuated, and the helium in the cavity is detected.

[0003] However, the disadvantages of the existing detection process are as follows: the sealing effect of the sealing nail is good. Even if there is a micro-leak or a large leak at the welded part of the injection hole, there will be no helium in the sealed cavity, resulting in abnormal detection and missed detection. In addition, another device is required to detect parameters such as the content of helium in the cavity, and its detection process and structure are relatively complex, greatly affecting the test speed and efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide, in view of the deficiencies of the existing technology, an airtightness detection structure and a battery vacuum detection device, which can solve the technical problems of the overly complex structure and cumbersome operation of the existing technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An airtightness detection structure includes a locking component, a detection head and a cylinder body; a diversion cavity is arranged inside the cylinder body; the detection head is arranged between the locking component and the cylinder body; the locking component is connected to the cylinder body; and an installation cavity is arranged inside the locking component; the detection head is detachably connected to the installation cavity and passes through the locking component; and a detection cavity is arranged inside the detection head; the detection cavity is communicated with the diversion cavity.

[0007] Preferably, the bottom of the cylinder body is detachably connected to the inside of the detection cavity; and / or, the outer side wall of the detection head is detachably connected to the inside of the installation cavity;

[0008] And the top of the locking component abuts against the bottom of the cylinder body.

[0009] Preferably, the bottom of the cylinder body is provided with an assembly convex part; the diversion cavity can extend through the assembly convex part;

[0010] The detection head is snap - connected to the outer side wall of the assembly convex part, or the detection head is detachably connected to the outer side wall of the assembly convex part by a thread.

[0011] Preferably, the locking member is sleeved on the outer side wall of the detection head; or the locking member is detachably connected to the outer side wall of the detection head by a thread.

[0012] Preferably, a contact convex part is provided at the bottom of the detection head; the detection cavity extends through the contact convex part; and the contact convex part passes through the locking member.

[0013] Preferably, a bottom sealing member is sleeved on one end of the contact convex part passing through the locking member.

[0014] Preferably, the diameter of the bottom of the diversion cavity is greater than or equal to the width of the contact convex part.

[0015] Preferably, the projection of the locking member towards the cylinder body covers the detection head;

[0016] And / or, a top sealing member is detachably provided at one end of the cylinder body away from the detection head; an emission cavity is provided in the top sealing member; and the emission cavity is communicated with the detection cavity.

[0017] The utility model also discloses a battery vacuum detection device, which includes a detection handle body, a diversion pipe, a container and a vacuum pumping pipeline; an accommodation cavity is provided in the container; one end of the diversion pipe is communicated with the detection handle body; the other end of the diversion pipe is communicated with the accommodation cavity; one end of the vacuum pumping pipeline is communicated with the accommodation cavity; the other end of the vacuum pumping pipeline is used for being communicated with a vacuum pump; the detection handle body is used for being placed into the liquid injection hole of a battery to be detected; and the detection handle body is the airtightness detection structure as described above.

[0018] Preferably, a sealing gasket is hermetically provided at one end of the detection head passing through the locking member.

[0019] The beneficial effects of the utility model are as follows. In this technical solution, the detection cavity in the detection head is placed at the position to be detected of the battery and the airtightness of this position is detected. When the airtightness is poor, the gas is guided to the diversion cavity through the detection cavity, which is beneficial to improving the detection speed, and improving the compactness and simplicity of the leak detection structure, greatly reducing the cost of the detection components; at the same time, setting the detection head between the locking member and the cylinder body can effectively avoid excessive and direct damage to the detection head caused by external factors; and the disassembly and connection method of the detection head can improve the convenience of disassembly and assembly to realize rapid replacement of the detection head, so as to be compatible with more different types of batteries and their positions, and improve the use efficiency. Description of the Drawings

[0020] The following will describe the features, advantages, and technical effects of the exemplary embodiments of the present utility model with reference to the attached Figures 1 to 5 drawings.

[0021] Figure 1 Explosion view of the airtightness detection structure according to an embodiment of the present utility model;

[0022] Figure 2 Structural schematic diagram of the airtightness detection structure according to an embodiment of the present utility model;

[0023] Figure 3 Partial enlarged view of the airtightness detection structure according to an embodiment of the present utility model;

[0024] Figure 4 Structural schematic diagram of the detection head of the airtightness detection structure according to an embodiment of the present utility model;

[0025] Figure 5 Structural schematic diagram of the battery vacuum detection device according to an embodiment of the present utility model.

[0026] In the figure: 1 - locking component; 11 - installation cavity; 2 - detection head; 21 - detection cavity; 201 - contact convex part; 3 - cylinder; 31 - diversion cavity; 301 - assembly convex part; 4 - top sealing component; 41 - discharge cavity; 401 - connection block; 402 - installation convex block; 5 - bottom sealing component; 51 - assembly hole; 100 - detection handle body; 200 - diversion pipe; 300 - container; 310 - accommodation cavity; 320 - sealing plug; 400 - vacuum extraction pipeline; 500 - sealing gasket. Specific embodiments

[0027] 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 specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0028] 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 specifying 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.

[0029] Reference to "embodiments" in this document 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 and 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.

[0030] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or there are multiple separate situations. Additionally, the character " / " in this document generally indicates that the associated objects before and after are in an "or" relationship.

[0031] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "linkage", "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 components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0032] The following further elaborates on the present utility model in conjunction with the attached Figures 1 to 5 but does not limit the present utility model.

[0033] As Figure 1 and 2 shown, in an embodiment of the present utility model, the airtightness detection structure includes a locking component 1, a detection head 2, and a cylinder 3; a diversion cavity 31 running through the cylinder 3 in the height direction of the cylinder 3 is provided inside the cylinder 3; the detection head 2 is arranged between the locking component 1 and the cylinder 3; the locking component 1 is connected to the cylinder 3; and an installation cavity 11 is provided inside the locking component 1; the detection head 2 is detachably connected inside the installation cavity 11 and passes through the locking component 1; and a detection cavity 21 running through the detection head 2 in the height direction of the detection head 2 is provided inside the detection head 2; the detection cavity 21 communicates with the diversion cavity 31; the detection cavity 21 is used to communicate with the position to be measured of the battery.

[0034] The technical solution of the present utility model detects the airtightness of the position to be measured of the battery (such as the liquid injection hole and other positions) by placing the detection cavity in the detection head. When the airtightness is poor (i.e., air leakage occurs), the gas is guided to the diversion cavity through the detection cavity, which is beneficial to improving the detection speed, and improving the compactness and simplicity of the leak detection structure, greatly reducing the cost of the detection components. At the same time, the detection head is arranged between the locking component and the cylinder body, which can effectively avoid excessive and direct damage to the detection head caused by external factors. And the disassembly and connection method of the detection head 2 can improve the convenience of disassembly and assembly, so as to realize the rapid replacement of the detection head, thereby being compatible with more different types of batteries and their positions, and improving the use efficiency.

[0035] Specifically, in some embodiments, as Figure 2 and 3 shown, the bottom of the cylinder body 3 is detachably connected to the inside of the detection cavity 21; the outer side wall of the detection head 2 is detachably connected to the inside of the installation cavity 11; and the top of the locking component 1 abuts against the bottom of the cylinder body 3. That is to say, the detachable assembly method from the inside to the outside can effectively improve the convenience of disassembly and assembly, and can improve the assembly stability as much as possible, realizing the compactness and simplicity of the structure.

[0036] Among them, in some embodiments, as Figure 2 and 3 shown, the bottom of the cylinder body 3 is provided with an assembly convex part 301; the diversion cavity 31 can extend through the assembly convex part 301; the detection head 2 is clamped on the outer side wall of the assembly convex part 301, or the detection head 2 is detachably connected to the outer side wall of the assembly convex part 301 by threads. That is to say, in one embodiment, the inner wall of the detection head 2 is closely connected to the outer side wall of the assembly convex part 301. In some other embodiments, the inner wall of the detection cavity 21 is provided with a first thread surface, and the outer side wall of the assembly convex part 301 is provided with a second thread surface for assembling with the first thread surface. This structure can effectively improve the convenience of disassembling the detection head 2, so as to realize the rapid replacement of the detection head, thereby being compatible with more different types of batteries and their positions, and improving the use efficiency.

[0037] Among them, in some embodiments, as Figure 2 and 3As shown, the locking component 1 is sleeved on the outer side wall of the detection head 2; or the locking component 1 is detachably connected to the outer side wall of the detection head 2 by threads. That is to say, in one embodiment, the inner wall of the locking component 1 is closely attached to the outer side wall of the detection head 2. In other embodiments, the inner wall of the installation cavity 11 is provided with a third thread surface; the outer side wall of the detection head 2 is provided with a fourth thread surface corresponding to the third thread surface. This structure can achieve the convenience of disassembling the locking component 1, thereby facilitating the disassembly of the detection head 2, realizing the rapid replacement of the detection head, and further being compatible with more different types of batteries and their positions, improving the use efficiency.

[0038] Specifically, in some embodiments, as Figure 3 and 4 shown, a contact convex portion 201 is provided at the bottom of the detection head 2; the detection cavity 21 extends through the contact convex portion 201; and the contact convex portion 201 passes through the locking component 1; the contact convex portion 201 is used to be placed at the position to be measured of the battery. This structure can avoid the phenomenon of the detection head 2 falling off by arranging the contact convex portion 201 through the locking component 1 and the main body of the detection head 2 in the installation cavity 11, thereby improving the assembly stability, and also ensuring the orderly progress of leak detection.

[0039] Specifically, in some embodiments, as Figure 3 and 4 shown, a bottom sealing component 5 is sleeved on one end of the contact convex portion 201 passing through the locking component 1. Among them, the bottom sealing component 5 is sealing silica gel. That is to say, covering the gap between the contact convex portion 201 and the installation cavity 11 with sealing silica gel as much as possible is conducive to the directional transmission of leaked gas, thereby ensuring the accuracy of the test, and also effectively avoiding phenomena such as the part of the contact convex portion 201 passing through the locking component 1 swinging.

[0040] Specifically, in some embodiments, as Figure 3 shown, the diameter of the bottom of the diversion cavity 31 is greater than or equal to the width of the contact convex portion 201 (the dimension in the horizontal or longitudinal direction). That is to say, by making the diameter of the bottom outlet of the diversion cavity 31 greater than or equal to the width of the contact convex portion 201, it can adapt to the replacement of more different specifications of the detection head 2, thereby being compatible with more different types of batteries and their positions, and improving the use efficiency.

[0041] Specifically, in some embodiments, as Figure 3As shown, the projection of the locking member 1 towards the cylinder body 3 covers the detection head 2. That is to say, through the full-coverage hidden covering of the detection head 2 by the locking member 1, the damage to the detection head 2 by the outside world and other phenomena are reduced, and thus the test accuracy of the detection head is effectively guaranteed.

[0042] Specifically, in some embodiments, as Figure 1 shown, a top sealing member 4 is detachably arranged at one end of the cylinder body 3 away from the detection head 2; a discharge cavity 41 is arranged inside the top sealing member 4; the discharge cavity 41 is communicated with the detection cavity 21. Among them, as Figure 1 shown, the top sealing member 4 includes a connecting block 401 and a mounting convex block 402 connected in sequence; the discharge cavity 41 is arranged through the connecting block 401 and the mounting convex block 402; and the mounting convex block 402 is detachably connected to the inside of the detection cavity 21. Further, in some of these embodiments, the mounting convex block 402 is clamped inside the detection cavity 21. In other embodiments, the mounting convex block 402 is connected to the inside of the detection cavity 21 by threads. That is to say, the outer side wall of the mounting convex block 402 is closely attached to the inner wall of the detection cavity 21; or the outer side wall of the mounting convex block 402 is provided with a fifth thread surface; the inner wall of the detection cavity 21 is provided with a sixth thread surface corresponding to the fifth thread surface.

[0043] The present utility model also proposes a battery vacuum detection device, as Figure 5 shown, this battery vacuum detection device includes a detection handle body 100, a diversion pipe 200, a container 300 and a vacuum extraction pipe 400; a containing cavity 310 is arranged inside the container 300; and the containing cavity 310 is used for storing liquid paraffin; one end of the diversion pipe 200 is communicated with the detection handle body 100; the other end of the diversion pipe 200 is communicated with the containing cavity 310; one end of the vacuum extraction pipe 400 is communicated with the containing cavity 310; the other end of the vacuum extraction pipe 400 is used for connecting to a vacuum pump; the detection handle body 100 is used for being placed into the liquid injection hole of the battery to be tested; and the detection handle body 100 is an airtight detection structure, and the specific structure of this airtight detection structure refers to the above embodiments. Since this battery vacuum detection device adopts all the technical solutions of the above all embodiments, it therefore has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here. Among them, the vacuum pump is a vacuum pump, etc.

[0044] That is to say, during operation, select the corresponding detection head 2 and snap the detection head 2 to the bottom of the cylinder 3; then thread the locking member 1 onto the outer end of the detection head 2 and ensure that the detection head 2 passes through the locking member 1; then place the detection handle body 100 into the battery liquid injection hole, and place the flow guide tube 200 connected to the other end of the detection handle body 100 into the paraffin solution; and connect the vacuum extraction pipe 400 in the paraffin solution to a vacuum pump. If the airtightness of the battery is poor, air bubbles will be generated in the paraffin solution in the flow guide tube 200 connected to the detection handle body 100.

[0045] Specifically, in some embodiments, as Figure 5 shown, a sealing gasket 500 is hermetically provided at one end of the locking member 1 through which the contact convex portion 201 in the detection head 2 passes. That is to say, when the detection is completed or in a static state, block the contact convex portion 201 with the sealing gasket 500 for sealing, so as to avoid wasting vacuum treatment and facilitate preparing for the next test cycle.

[0046] Specifically, in some embodiments, as Figure 5 shown, a sealing plug 320 is provided at the opening of the container 300; one end of the flow guide tube 320 passes through and is connected to the sealing plug 320; and one end of the flow guide tube 320 communicates with liquid paraffin; one end of the vacuum extraction pipe 400 passes through and is connected to the sealing plug 320; and one end of the vacuum extraction pipe 400 is located above the liquid paraffin.

[0047] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0048] According to the disclosure and teachings of the above specification, those skilled in the art of the present invention can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the above specific embodiments. Any obvious improvements, substitutions or variations made by those skilled in the art on the basis of the present invention all fall within the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. An airtightness detection structure, characterized in that: It includes a locking component, a detection head and a cylinder; a flow guide cavity is provided in the cylinder; the detection head is arranged between the locking component and the cylinder; the locking component is connected to the cylinder; and a mounting cavity is provided in the locking component; the detection head is detachably connected to the mounting cavity and is arranged through the locking component; and a detection cavity is provided in the detection head; the detection cavity is connected to the flow guide cavity.

2. The airtightness detection structure according to claim 1, characterized in that: The bottom of the cylinder is detachably connected to the inside of the detection cavity; and / or the outer side wall of the detection head is detachably connected to the inside of the installation cavity; And the top of the locking component abuts against the bottom of the cylinder.

3. The airtightness detection structure according to claim 2, characterized in that: The bottom of the cylinder is provided with an assembly convex portion; the flow guide cavity can extend through the assembly convex portion; The detection head is clamped on the outer side wall of the assembly protrusion, or the detection head is detachably connected to the outer side wall of the assembly protrusion through threads.

4. The airtightness detection structure according to claim 2 or 3, characterized in that: The locking component is sleeved on the outer side wall of the detection head; or the locking component is detachably connected to the outer side wall of the detection head through threads.

5. The airtightness detection structure according to claim 1 or 2, characterized in that: A contact convex portion is provided at the bottom of the detection head; the detection cavity is arranged to extend through the contact convex portion; and the contact convex portion is arranged to pass through the locking component.

6. The airtightness detection structure according to claim 5, characterized in that: A bottom sealing component is sleeved on one end of the contact protrusion passing through the locking component.

7. The airtightness detection structure according to claim 5, characterized in that: The diameter of the bottom of the flow guiding cavity is greater than or equal to the width of the contact protrusion.

8. The airtightness detection structure according to claim 1, characterized in that: The projection of the locking component toward the cylinder covers the detection head; And / or, a top sealing component is detachably provided at one end of the cylinder away from the detection head; a discharge cavity is provided in the top sealing component; and the discharge cavity is communicated with the detection cavity.

9. A battery vacuum detection device, characterized in that: It includes a detection handle body, a flow guide tube, a container and a vacuum pipe; the container is provided with a accommodating cavity; one end of the flow guide tube is connected to the detection handle body; the other end of the flow guide tube is connected to the accommodating cavity; one end of the vacuum pipe is connected to the accommodating cavity; the other end of the vacuum pipe is used for connecting to a vacuum pump; the detection handle body is used to be placed in the liquid injection hole of the battery to be tested; and the detection handle body is the airtightness detection structure according to any one of claims 1 to 8.

10. The battery vacuum detection device according to claim 9, characterized in that: One end of the detection head passing through the locking component is sealed with a sealing gasket.

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