Lithium battery withstand voltage test device

Abstract

The utility model discloses a lithium battery withstand voltage testing device which comprises a threaded column, a drill rod and a limiting piece. The threaded column is provided with a mounting hole used for being communicated with an external air source. The drill rod comprises a connecting part and a puncturing part located at one end of the connecting part, the drill rod is detachably mounted in the mounting hole, an air guide groove is formed in the outer side of the drill rod, the air guide groove extends to the puncturing part, and the air guide groove is communicated with the mounting hole at the same time; and one end of the limiting piece penetrates through the side wall of the threaded column, extends into the mounting hole, is connected with the drill rod and is used for limiting the drill rod. According to the scheme, the drill rod is detachably mounted in the mounting hole of the threaded column, different positions of the drill rod are limited through the limiting piece, after long-time use, if the puncture part is damaged, the drill rod is taken out of the mounting hole to be replaced, and the whole testing device does not need to be replaced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery manufacturing auxiliary technical field more specifically, relate to a kind of lithium battery pressure test device. BACKGROUND

[0002] The quality safety of lithium battery has always been the most important in the field of lithium battery, lithium battery in repeated charging and discharging process, external short circuit, internal short circuit, overcharge phenomenon, cause battery internal temperature to sharply increase, electrolyte vaporization, expand battery shell, thereby explosion occurs, in order to prevent this phenomenon from happening, need to install explosion-proof valve on lithium battery, when pressure reaches certain time, explosion-proof valve first cracks, play pressure relief function, to avoid the occurrence of explosion, so need to carry out explosion-proof valve press test to lithium battery.

[0003] The existing lithium battery pressure test device connects external gas source to fill gas into battery after piercing the external aluminum shell of battery to test the pressure resistance performance of battery. For example, the authorized announcement No. CN210166144U discloses a kind of lithium battery explosion-proof valve press test device, including box and drill rod, box is the frame structure of one end opening, box side is equipped with connecting screw hole, drill rod outside is equipped with external thread, drill rod first end passes through connecting screw hole and extends into box interior, and drill rod is screwed with box, drill rod inside is equipped with air passage, drill rod first end is equipped with drill bit, and drill bit is equipped with recess that is communicated with air passage, drill rod second end is equipped with air vent that is communicated with air passage, and air vent inner wall is equipped with internal thread. In the scheme, drill bit is damaged and difficult to disassemble and replace, and the test device needs to be replaced as a whole, causing waste. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of lithium battery pressure test device, in the scheme, drill rod or drill bit can be replaced individually when being damaged.

[0005] To achieve the above purpose, the technical scheme provided by the utility model is as follows:

[0006] A kind of lithium battery pressure test device, comprising,

[0007] Threaded column, installation hole is provided in the axial direction in it, one end of the installation hole is used to communicate with external gas source;

[0008] Drill rod, including connecting portion and puncture portion located at one end of the connecting portion, the drill rod can be detachably installed in the installation hole, and the puncture portion can be extended to the outside of the threaded column for piercing battery aluminum shell;Air guide groove is opened on the outside of the drill rod, the air guide groove extends to the puncture portion, and the air guide groove is communicated with the installation hole simultaneously;

[0009] A limiting member is arranged to pass through the sidewall of the threaded column and extend into the mounting hole to connect with the drill rod, and to limit the drill rod.

[0010] In the present application, the drill rod is detachably mounted in the mounting hole of the threaded column and is limited at different positions by the limiting member. After long-term use, if the puncture part is damaged, the drill rod can be removed from the mounting hole for replacement, without the need to replace the entire test device. Moreover, the puncture part can be retracted into the threaded column when not in use or during transportation, so as to facilitate storage of the entire test device and avoid damage to the puncture part during transportation. In addition, the gas guide groove is arranged on the side of the drill rod, which not only facilitates processing, but also helps the puncture part to have a good taper.

[0011] As a further improvement, the drill rod is provided with a first limiting hole and a second limiting hole for connecting with the limiting member. When the limiting member is connected to the first limiting hole, the puncture part extends out of the threaded column. When the limiting member is connected to the second limiting hole, the puncture part is retracted into the mounting hole. In this way, the limiting column cannot be arranged on the drill rod, simplifying the structure of the drill rod.

[0012] As a further improvement, the end of the connecting part away from the puncture part is connected with a limiting column, and the diameter of the limiting column is greater than that of the connecting part. The mounting hole includes a second mounting groove and a first mounting groove which are connected and have different diameters. The connecting part is located in the second mounting groove, and the limiting column is located in the first mounting groove. The limiting column is arranged, and one side of the limiting column can be limited by abutting on the step at the connection of the second mounting groove and the first mounting groove.

[0013] As a further improvement, the length of the drill rod is less than the length of the mounting hole. When the limiting member is connected to the end of the limiting column away from the puncture part, the puncture part extends out of the threaded column. When the limiting member is connected to the end of the limiting column close to the puncture part, the puncture part is retracted into the mounting hole. In this way, the puncture part can be completely retracted into the mounting hole when the test device is not in use.

[0014] As a further improvement, the gas guide groove includes a third gas guide groove on the connecting part and the puncture part, and a first gas guide groove on the limiting column.

[0015] As a further improvement, the gas guide groove further includes a second gas guide groove which is arranged on the limiting column and close to one side of the connecting part.

[0016] As a further improvement, the limiting member can be connected with the second gas guide groove.

[0017] As a further improvement, a third mounting groove is formed in the end face of the threaded column, the third mounting groove is located on the side of the threaded column close to the puncture part, and a sealing element is mounted in the third mounting groove.

[0018] As a further improvement, an external connecting element is mounted at one end of the mounting hole.

[0019] As a further improvement, a handle is further mounted on the threaded column.

[0020] Other technical problems that can be solved by the lithium battery pressure test device, other technical features contained in the technical solutions, and the advantages brought by these technical features will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the lithium battery pressure test device.

[0022] Figure 2 It is a sectional view of the lithium battery pressure test device.

[0023] Figure 3 It is a sectional view of the threaded column.

[0024] Figure 4 It is a schematic diagram of the drill rod structure.

[0025] REFERENCE NUMERALS:

[0026] 1, threaded column; 2, connecting part; 3, sealing element; 4, third air guide groove; 5, limiting hole; 6, handle; 7, third mounting groove; 8, second mounting groove; 9, first mounting groove; 10, external connecting element; 11, limiting element; 12, limiting column; 13, first air guide groove; 14, second air guide groove; 15, puncture part. DETAILED DESCRIPTION

[0027] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings and examples.

[0028] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and do not define the limiting conditions for the implementation of the utility model, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the functions and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0029] Meanwhile, the terms such as "upper", "lower", "left", "right", "intermediate" and the like cited in the present specification are merely for the convenience of clear description, and are not intended to limit the range of implementation, and the change or adjustment of the relative relationship is also regarded as the implementation of the present application without substantial change in technical content. Moreover, in addition to being used to indicate the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances.

[0030] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented.

[0031] In combination Figures 1-4 As shown in the drawings, the present embodiment provides a lithium battery pressure test device, which comprises a threaded column 1, a drill rod and a limiting piece 11. The threaded column 1 is provided with external threads on the outer peripheral side, and a mounting hole is arranged in the threaded column 1 along the axial direction thereof, preferably at the axial center of the threaded column 1, and one end of the mounting hole is used to communicate with an external air source.

[0032] The drill rod comprises a connecting portion 2 and a puncture portion 15 at one end of the connecting portion 2, and the drill rod is detachably mounted in the mounting hole, and the puncture portion 15 can extend out of the threaded column 1 for piercing the aluminum shell of the battery. A gas guide groove is formed on the outer side of the drill rod, which extends to the puncture portion 15 and simultaneously communicates with the mounting hole.

[0033] One end of the limiting piece 11 extends through the side wall of the threaded column 1 into the mounting hole and is connected with the drill rod, for limiting the drill rod and positioning the drill rod at different positions to correspond to the extension of the puncture portion 15 out of the threaded column 1 or the retraction of the puncture portion 15 in the threaded column 1. A limiting hole 5 can be formed on the threaded column 1 for the limiting piece 11 to pass through.

[0034] The lithium battery pressure test device in the present embodiment, in use, one end of the mounting hole communicates with the external air source, and the limiting piece 11 fixes the puncture portion 15 at a position extending out of the threaded column 1. The puncture portion 15 is used to pierce the aluminum shell of the battery, and the gas enters the inside of the battery through the mounting hole and the gas guide groove, so as to test the pressure resistance of the battery. When not in use or during transportation, the puncture portion 15 can be retracted in the threaded column 1, so as to facilitate the storage of the entire test device, and also to avoid damage to the puncture portion 15 during transportation. After long-term use, if the puncture portion 15 is damaged, the drill rod can be taken out of the mounting hole for replacement, without the need to replace the entire test device.

[0035] In addition, in the present scheme, the air guide groove is arranged on the outer side of the drill rod and extends to the puncture part 15. Compared with the air guide groove arranged in the inner side of the drill rod, the air guide groove arranged on the side of the drill rod not only has the effect of facilitating processing, but also is beneficial to make the puncture part 15 have a better taper.

[0036] In combination Figure 3 and Figure 4 As shown in FIG. 1, as a specific embodiment, the connecting part 2 is connected to the limiting column 12 at the end away from the puncture part 15, and the diameter of the limiting column 12 is greater than the diameter of the connecting part 2. The mounting hole includes the second mounting groove 8 and the first mounting groove 9 which are connected and have different diameters, wherein the second mounting groove 8 is adapted to mount the connecting part 2, and the first mounting groove 9 is adapted to mount the limiting column 12. When the drill rod is mounted, one end of the limiting column 12 can abut against the step at the connection between the second mounting groove 8 and the first mounting groove 9. More specifically, the length of the drill rod is less than the length of the mounting hole; when the limiting part 11 is connected to the end of the limiting column 12 away from the puncture part 15, the puncture part 15 protrudes out of the threaded column 1; when the limiting part 11 is connected to the end of the limiting column 12 close to the puncture part 15, the puncture part 15 is retracted into the mounting hole. The length of the limiting column 12 is greater than the length of the puncture part 15, so that when the limiting part 11 is connected to the end of the limiting column 12 close to the puncture part 15, the puncture part 15 can be completely retracted into the mounting hole.

[0037] Preferably, the air guide groove includes the third air guide groove 4 located on the connecting part 2 and the puncture part 15, and the first air guide groove 13 located on the limiting column 12.

[0038] In another embodiment, the air guide groove further includes the second air guide groove 14 which is arranged on the limiting column 12 and close to one side of the connecting part 2. It should be noted that after the drill rod is connected into the mounting hole, since one end of the limiting column 12 can abut against the step at the connection between the second mounting groove 8 and the first mounting groove 9, when the length of the limiting column 12 is less than the distance from the limiting part 11 to the second mounting groove 8, the second air guide groove 14 is not needed, and the third air guide groove 4 can communicate with the first air guide groove 13 through the gap between the limiting column 12 and the step at the connection between the second mounting groove 8 and the first mounting groove 9; if the length of the limiting column 12 is equal to the distance from the limiting part 11 to the second mounting groove 8, the limiting column 12 will abut against the step at the connection between the second mounting groove 8 and the first mounting groove 9, and thus the second air guide groove 14 is needed to communicate the first air guide groove 13 and the third air guide groove 4.

[0039] When the second air guide groove 14 is provided, the shape of the second air guide groove 14 can be set to match the shape of the limiting part 11. When the limiting part 11 is connected to the end of the limiting column 12 close to the puncture part 15, the limiting part 11 can be connected to the second air guide groove 14.

[0040] In another embodiment, the limiting column 12 structure is not provided. In order to limit the drill pipe, the first limiting hole and the second limiting hole are provided on the drill pipe, which are used to connect with the limiting member 11; when the limiting member 11 is connected into the first limiting hole, the puncture part 15 extends out of the threaded column 1; when the limiting member 11 is connected into the second limiting hole, the puncture part 15 is retracted into the mounting hole.

[0041] Further combined Figure 1 And Figure 2 As shown in the figure, the end surface of the threaded column 1 is provided with a third mounting groove 7, which is located on the side of the threaded column 1 close to the puncture part 15, and the sealing member 3 is mounted in the third mounting groove 7. When the puncture part 15 pierces the battery shell to inflate, the sealing member 3 forms a contact seal with the battery shell, avoiding the phenomenon of air leakage during the inflation process.

[0042] In addition, one end of the mounting hole is provided with an external connecting member 10, which is connected with the external gas source. For example, the external connecting member 10 can be a gas pipe joint and the like.

[0043] In order to facilitate holding and operating the test device, the threaded column 1 is further provided with a handle 6. Specifically, the handle 6 is located on the same side of the threaded column 1 as the external connecting member 10, and the handle 6 is used to rotate the threaded column 1.

[0044] Some terms "mounting", "providing", "provided with", "connecting" referred to herein should be understood broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0045] The above describes the utility model and its embodiments in a schematic way, which is not limited, and the figure shown is only one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if the ordinary skilled person in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structure and embodiments can be designed without creativity, which should belong to the protection scope of the utility model.

Claims

1. A lithium battery voltage withstanding test device, characterized in that: The utility model relates to a battery puncture device, including, A threaded column (1) is provided with a mounting hole in the axial direction, one end of the mounting hole is used for communicating with an external air source; A drill rod includes a connecting part (2) and a puncture part (15) at one end of the connecting part (2), the drill rod is detachably mounted in the mounting hole, and the puncture part (15) can extend out of the threaded column (1) to pierce the aluminum shell of a battery; a gas guide groove is formed on the outer side of the drill rod, the gas guide groove extends to the puncture part (15), and the gas guide groove communicates with the mounting hole at the same time; A limiting piece (11) extends through the side wall of the threaded column (1) to the mounting hole and is connected with the drill rod, and is used for limiting the drill rod.

2. The lithium battery voltage withstanding test device according to claim 1, wherein: First and second limiting holes are formed in the drill rod and used for connecting with the limiting piece (11); when the limiting piece (11) is connected into the first limiting hole, the puncture part (15) extends out of the threaded column (1); when the limiting piece (11) is connected into the second limiting hole, the puncture part (15) is retracted into the mounting hole. 3.The lithium battery voltage withstanding test device according to claim 1, wherein: The connecting part (2) is connected with a limiting column (12) at one end away from the puncture part (15), and the diameter of the limiting column (12) is greater than that of the connecting part (2); The mounting hole includes a second mounting groove (8) and a first mounting groove (9) which communicate and have different diameters, the connecting part (2) is located in the second mounting groove (8), and the limiting column (12) is located in the first mounting groove (9).

4. The lithium battery voltage withstanding test device according to claim 3, characterized in that: The length of the drill rod is less than that of the mounting hole; When the limiting piece (11) is connected to one end of the limiting column (12) away from the puncture part (15), the puncture part (15) extends out of the threaded column (1); when the limiting piece (11) is connected to one end of the limiting column (12) close to the puncture part (15), the puncture part (15) is retracted into the mounting hole.

5. The lithium battery voltage withstand test device of claim 3, wherein: The gas guide groove includes a third gas guide groove (4) on the connecting part (2) and the puncture part (15), and a first gas guide groove (13) on the limiting column (12).

6. The lithium battery voltage withstand test device of claim 5, wherein: The gas guide groove further includes a second gas guide groove (14) which is formed on the limiting column (12) and close to one side of the connecting part (2).

7. The lithium battery voltage withstand test device of claim 6, wherein: The limiting piece (11) can be connected with the second gas guide groove (14).

8. The lithium battery voltage withstand test device according to any one of claims 1-7, wherein: A third mounting groove (7) is formed in the end face of the threaded column (1), the third mounting groove (7) is located on one side of the threaded column (1) close to the puncture part (15), and a sealing piece (3) is mounted in the third mounting groove (7).

9. The lithium battery voltage withstand test device of claim 8, wherein: An external connecting piece (10) is mounted at one end of the mounting hole.

10. The lithium battery voltage withstand test device of claim 8, wherein: A handle (6) is further mounted on the threaded column (1).

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