CN221077958U - Blade battery case helium detection jig - Google Patents

Abstract

The utility model discloses a blade battery shell helium detection jig which comprises a support, a limiting assembly and a gas circuit for detecting tightness of a welding seam of a battery shell, wherein the limiting assembly comprises a first jig and a pressing mechanism capable of being pressed on the first jig; a first groove is formed in the first jig, and a first airtight space is formed at a welding seam of the first groove and the battery shell when the battery shell is sleeved on the first jig; the pressing mechanism is provided with a second groove, and when the pressing mechanism is pressed on the battery shell, a second airtight space is formed at the welding seam of the second groove and the battery shell; according to the utility model, the first jig is used for positioning the battery shell from the inside and forming a first airtight space with the welding seam, the second jig is used for limiting the battery shell from the outside and forming a second airtight space with the welding seam, and helium detection of the battery shell is realized through two smaller airtight spaces, so that the consumption of helium is greatly reduced, and the cost of helium detection is effectively reduced.

Description

Blade battery case helium detection jig

Technical Field

The utility model relates to the technical field of weld joint detection, in particular to a blade battery shell helium detection jig.

Background

Blade battery cases are typically first formed from aluminum sheet material by an aluminum extrusion process and then welded to form the finished battery case. In order to ensure the use safety of the battery case, helium detection is required to be carried out on the welding seam after the welding is completed. The existing detection jig mainly comprises a hollow mold core, plugs for plugging two ends of a battery shell of a blade are arranged at two ends of the hollow mold core, a through hole is formed in the hollow mold core corresponding to a welding seam of the battery shell, a vacuumizing hole communicated with vacuumizing equipment is formed in the hollow mold core, and a helium gas detection connector communicated with a helium detection mechanism is further arranged on the hollow mold core. During detection, the blade battery shell is sleeved and connected inside the hollow mold core to be fixed, two ends of the blade battery shell are plugged, the cavity inside the hollow mold core and the cavity outside the blade battery shell are vacuumized in a vacuumizing mode, the vacuum cavity is connected with the leak detector, helium with certain pressure is filled into the battery shell, and if a leak hole exists at a welding seam, the helium enters the vacuum chamber through the leak hole and enters the leak detector. Because the volume of the cavity in the shell is larger, more helium is consumed in helium detection, and therefore, the blade battery shell helium detection jig is provided.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model aims to solve the technical problems that: the utility model provides a blade battery case helium examines tool, locate the battery case and form first airtight space with welding seam department with first tool from inside, form the second airtight space with welding seam department with the outside spacing battery case of second tool, realize examining the helium of battery case through two less airtight spaces to reduce helium consumption by a wide margin.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a tool is examined to blade battery case helium for detect the gas tightness of blade battery case welding seam, including support, locate spacing subassembly on the support and be used for carrying out the gas circuit that the leakproofness detected to the welding seam of battery case, spacing subassembly includes the first tool that is used for supplying the battery case cover to establish on it and can pressfitting in the pressfitting mechanism of one side of just facing the welding seam on the first tool; a first groove is formed in the position, facing the welding line, of the first jig, and a first airtight space is formed at the welding line between the first groove and the battery shell when the battery shell is sleeved on the first jig; a second groove is formed in one side, close to the first jig, of the pressing mechanism, and when the pressing mechanism is pressed on the battery shell, a second airtight space is formed at a welding seam of the second groove and the battery shell;

The gas circuit comprises a vacuumizing air passage and a helium feeding air passage, wherein the vacuumizing air passage is used for vacuumizing the first closed space or the second closed space, and the helium feeding air passage is used for feeding helium to the second closed space or the first closed space.

Further, the vacuum air channel is arranged on the pressing mechanism, the inner end of the vacuum air channel extends towards the second groove and penetrates through a groove wall of the second groove to form a second air hole and is communicated with the second airtight space, and the outer end of the vacuum air channel extends outwards and penetrates through the first jig; the helium delivery channel is arranged on the first jig, the inner end of the helium delivery channel extends towards the first groove and penetrates through a groove wall of the first groove to form a first air hole and is communicated with the first airtight space, and the outer end of the helium delivery channel extends outwards and penetrates through the first jig.

Further, the support is provided with first sliding rail assemblies distributed along the vertical direction, and the first jig is in sliding fit with the first sliding rail assemblies so as to enable the first jig to slide along the vertical direction; the support is also provided with a supporting component, and the first jig can be supported on the supporting component after being downwards moved; the support is also provided with an elastic resetting piece, the first jig can be reset upwards under the action of the elastic resetting piece, and when the first jig is at an initial resetting position, a first gap is formed between the upper end face of the first jig and the lower end face of the pressing mechanism, and a second gap is formed between the lower end face of the first jig and the supporting face of the supporting component.

Further, the first jig comprises a connecting portion in sliding fit with the first sliding rail assembly and a sleeving portion on which the battery shell is sleeved, and the first groove is formed in the position, corresponding to the welding seam position of the battery shell, of the upper end face of the connecting portion.

Further, the first sliding rail assembly comprises a plurality of first monorails which are arranged on the support in parallel along the length direction of the first jig, each first monorail extends along the vertical direction, and the connecting part is in sliding connection with each first monorail; the supporting assembly comprises at least two supporting upright posts, at least one supporting upright post is arranged below the connecting part in a standing mode, and at least one supporting upright post is arranged below one end, far away from the connecting part, of the sleeving part; the elastic resetting piece is limited to be arranged on the tension spring above the first jig, the upper end of the tension spring is fixedly arranged on the support, and the lower end of the tension spring is connected with the connecting part.

Further, the upper end face of the sleeving part is concaved downwards to form a through groove, the through groove penetrates through the sleeving part in the width direction of the sleeving part, the length of the through groove is larger than that of the battery case, the first groove is formed by downwards concavely arranging the lower wall of the through groove, a sealing ring is arranged in the through groove, and the sealing ring is arranged around the periphery of the first groove and is enclosed together with the first groove and the battery case to form a first closed space.

Further, a limiting unit is arranged at one end, close to the connecting portion, of the sleeving portion, the limiting unit comprises a first limiting portion and a second limiting portion which are symmetrically arranged on the front side face and the back side face of the sleeving portion, one side face, far away from the connecting portion, of the first limiting portion and the second limiting portion is limited to be a propping edge distributed along the vertical direction, and the end portion of the battery case is propped against the propping edge.

Further, a helium detecting connector is arranged at one end, far away from the sleeving part, of the connecting part, the outer end of the helium feeding air channel is outwards communicated with one end, far away from the sleeving part, of the connecting part so as to be communicated with the helium detecting connector, and the inner end of the helium feeding air channel extends towards the sleeving part and is communicated with the groove bottom wall of the first groove so as to be communicated with the first closed space.

Further, a second sliding rail component positioned above the first jig is arranged on the support; the pressing mechanism comprises a second jig and a driving assembly, wherein the second jig is in sliding fit with the second sliding rail assembly, the driving assembly is arranged on the support and used for driving the second jig to vertically move, the second groove is formed by upwards concavely arranging the lower end face of the second jig, and the second groove is opposite to the first groove.

Further, the upper end face of the second jig is provided with a vacuumizing joint, the outer end of the vacuumizing air channel is communicated with the vacuumizing joint, and the inner end of the vacuumizing air channel is downwards communicated with the bottom wall of the second groove so as to be communicated with the second closed space.

The blade battery shell helium detection jig has at least the following beneficial effects: the battery shell is positioned from the inside by the first jig and forms a first airtight space with the welding seam, the battery shell is limited from the outside by the second jig and forms a second airtight space with the welding seam, and helium detection of the battery shell is realized through the two smaller airtight spaces, so that the consumption of helium is greatly reduced, and the cost of helium detection is effectively reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

Fig. 1 is a schematic view of the structure of a battery case according to the present utility model;

FIG. 2 is a schematic diagram of a first embodiment of the present utility model;

FIG. 3 is a schematic diagram of a second embodiment of the present utility model;

FIG. 4 is a schematic view of a first fixture and helium delivery connector according to an embodiment of the present utility model;

FIG. 5 is a schematic view of the partial structure at C in FIG. 4;

FIG. 6 is a schematic view of a support, a first rail assembly, a second rail assembly, and the like according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram of a first jig and a second jig according to an embodiment of the utility model;

FIG. 8 is a schematic cross-sectional view of an embodiment of the present utility model;

FIG. 9 is a schematic view of the partial structure at A in FIG. 8;

Fig. 10 is a schematic view of a partial structure at B in fig. 8.

The meaning of the reference numerals in the drawings are:

a battery case 1, a cavity 11 and a weld joint 12;

A support 2, a bottom plate 21, a first bracket 22 and a second bracket 23;

The device comprises a gas circuit 3, a vacuumizing air passage 31, a helium feeding passage 32, a vacuumizing joint 33, a helium feeding joint 34, a first gas hole 35 and a second gas hole 36;

The first jig 4, the connecting part 41, the sleeving part 42, the through groove 421, the first groove 422, the sealing ring 423, the first closed space 424, the first sliding rail component 43, the first monorail 431, the first clamping groove 432, the first lug 433, the first sliding block 434, the first limiting part 44, the second limiting part 45, the first limiting groove 46, the second limiting groove 47, the supporting component 48, the supporting column 481, the elastic reset piece 49, the first convex column 491, the second convex column 492 and the hook 493;

The pressing mechanism 5, the second jig 51, the second sliding rail assembly 52, the second monorail 521, the second clamping groove 522, the second bump 523, the second slider 524, the second groove 53, the second closed space 54, the pressing cylinder 55, the third bracket 56 and the fourth bracket 57.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

Referring to fig. 1, a schematic view of a blade battery case (hereinafter referred to as "battery case 1") according to the present embodiment is shown. The top cover is rectangular as a whole, a cavity 11 is formed in the middle of the top cover, and the cavity 11 is distributed along the length direction of the battery shell 1 and penetrates through two ends of the battery shell 1. The upper side wall of the battery case 1 is provided with a welding seam 12 extending to two ends of the battery case 1 along the length direction of the battery case 1. It should be understood that the terms "upper", "lower", and the like, herein denote directions in which the directions are indicated as being shown in the drawings.

Referring to fig. 2, the helium detection fixture for the blade battery case 1 of the present utility model includes a support 2, a limiting component disposed on the support 2, and an air path 3 for detecting tightness of a weld 12 of the battery case 1. The limiting assembly comprises a first jig 4 used for the battery case 1 to be sleeved on and a pressing mechanism 5 capable of pressing one side, opposite to the welding line 12, of the first jig 4.

Referring to fig. 2 and 3, the support 2 includes a base 21, a first support 22 disposed on an upper surface of the base 21, and a second support 23 for stabilizing the first support 22. The first brackets 22 are vertically disposed on the upper surface of the bottom plate 21 along the length direction of the bottom plate 21, the second brackets 23 are defined as three, the three second brackets 23 are disposed along the width direction of the bottom plate 21 and are uniformly spaced on the rear side of the first brackets 22 along the length direction of the bottom plate 21, and the three second brackets 23 each have a horizontal plane connected with the bottom plate 21 and a vertical plane connected with the rear side of the first brackets 22.

Referring to fig. 1, 4 and 5, the first jig 4 is disposed on the front side of the first bracket 22 along the length direction of the first bracket 22, and includes a connection portion 41 for connecting with the first bracket 22, a sleeve portion 42 on which the battery case 1 is sleeved, and a limiting unit for horizontally limiting the battery case 1. The connecting portion 41 is disposed coaxially with the fitting portion 42, and the connecting portion 41 is located at one lateral end of the fitting portion 42, and in this embodiment, the connecting portion 41 is located at the left end of the fitting portion 42. A first sliding rail assembly 43 capable of vertically sliding the first jig 4 relative to the first jig 4 is disposed between the sleeve portion 42 and the first bracket 22. The upper end surface of the sleeve portion 42 is concavely formed with a through groove 421 distributed along the length direction of the sleeve portion 42, the through groove 421 penetrates through the sleeve portion 42 along the width direction of the sleeve portion 42, and the length of the through groove 421 is greater than the length of the battery case 1. The middle part of the lower wall of the through groove 421 is provided with a first groove 422 in a downward concave manner, and the first groove 422 is formed along the length direction of the through groove 421 and has a length matched with the length of the welding seam 12 of the battery case 1. The inside of the through groove 421 is provided with a sealing ring 423, the sealing ring 423 is disposed around the periphery of the first groove 422, and the lower wall, the left side wall and the right side wall of the sealing ring 423 are all in sealing connection with the corresponding side walls of the through groove 421. The sealing ring 423, the first groove 422 and the upper side wall of the battery case 1 together enclose a first sealed space 424. The limiting unit comprises a first limiting part 44 and a second limiting part 45 which are symmetrically arranged on the front side surface and the back side surface of the sleeving part 42, a first limiting groove 46 for installing the first limiting part 44 is formed on the front side surface (namely the front side surface in the figure), a second limiting groove 47 which is symmetrically arranged with the first limiting groove 46 and is used for installing the second limiting part 45 is formed on the back side surface (namely the back side surface in the figure) of the sleeving part 42, and the first limiting groove 46 and the second limiting groove 47 are respectively formed on the left end of the sleeving part 42 along the vertical direction. The first limiting portion 44 and the second limiting portion 45 are respectively clamped in the first limiting groove 46 and the second limiting groove 47, right sides of the first limiting portion 44 and the second limiting portion 45 are limited to be propping edges, and left ends of the battery case 1 are propped against the propping edges. A supporting component 48 for supporting the first jig 4 and an elastic resetting piece 49 for driving the first jig 4 to reset are further arranged between the first jig 4 and the support 2.

Referring to fig. 6 and 7, the first sliding rail assembly 43 is disposed at a position on the front side of the first bracket 22 corresponding to the connecting portion 41, so that the first fixture 4 can slide vertically relative to the first bracket 22, and includes a plurality of first monorails 431 disposed on the front side of the first bracket 22 in parallel and uniformly spaced along the length direction of the first fixture 4, and in the illustrated embodiment, the number of first monorails 431 is two. The front side of the first bracket 22 is provided with two first clamping grooves 432 parallel to each other for installing two first monorails 431, and the two first clamping grooves 432 are vertically spaced along the length direction of the first bracket 22. The two first monorails 431 are respectively clamped in the two first clamping grooves 432 one by one. The lower ends of the two first clamping grooves 432 are respectively provided with a first protruding block 433 for vertically limiting the first monorail 431, and when the first monorail 431 is clamped in the first clamping grooves 432, the lower end of the first monorail 431 is abutted to the upper end of the first protruding block 433. The positions of the rear end face of the first jig 4, corresponding to the two first monorails 431, are respectively provided with two first sliding blocks 434, the two first sliding blocks 434 are respectively and vertically connected with the corresponding first monorails 431 in a sliding manner, and the friction force between the first sliding blocks 434 and the first monorails 431 is smaller than the friction force between the first monorails 431 and the first clamping grooves 432.

The supporting assembly 48 comprises at least two supporting columns 481, and a plurality of supporting columns 481 are vertically arranged on the bottom plate 21 at positions corresponding to the first jig 4. In the illustrated embodiment, there are two support columns 481. One of the support columns 481 is vertically disposed below the connection portion 41, and the other support column 481 is vertically disposed below the fitting portion 42.

Referring to fig. 1, the elastic restoring member 49 is defined as a tension spring disposed on the first fixture 4. The front end surface of the first bracket 22 is provided with a first horizontally arranged protruding column 491 at a position above the sleeving part 42, the rear end of the sleeving part 42 is provided with a second horizontally arranged protruding column 492, and the second protruding column 492 and the first protruding column 491 are positioned on the same vertical axis. The upper end and the lower end of the tension spring are respectively provided with a hook 493, the hook 493 at the upper end of the tension spring is connected with the first convex column 491, and the hook 493 at the lower end of the tension spring is connected with the second convex column 492. When the elastic restoring member 49 is in an unstretched state, the first jig 4 is at an initial restoring position, and a first gap is formed between the upper end surface of the first jig 4 and the lower end surface of the pressing mechanism 5, and a second gap is formed between the lower end surface of the first jig and the first and second protruding columns 491 and 492.

The pressing mechanism 5 includes a second jig 51 and a driving assembly disposed on the second bracket 23 for driving the second jig 51 to move vertically. The second jig 51 is defined as a pressing block that can be pressed onto the first jig 4, and the pressing block is connected to the first bracket 22 through a second sliding rail assembly 52 disposed above the first jig 4. The width of the pressing block is not smaller than the width of the first jig 4, and the length of the pressing block is not smaller than the length of the through groove 421. The lower end surface of the pressing block is concavely arranged upwards to form a second groove 53, the second groove 53 is opposite to the first groove 422, the length of the second groove 53 is matched with that of the first groove 422, and a second airtight space 54 is formed at the welding seam 12 of the second groove 53 and the battery case 1. The driving assembly comprises at least two pressing cylinders 55, and a plurality of pressing cylinders 55 are arranged at positions corresponding to the pressing blocks on the front side of the upper end of the first support 22, and each pressing cylinder 55 is arranged on the first support 22 through a mounting frame. In the illustrated embodiment, there are two lamination cylinders 55, and the two lamination cylinders 55 are disposed at intervals along the length direction of the first bracket 22. The output shafts of the pressing cylinders 55 extend vertically downwards and are connected with the pressing blocks.

Referring to fig. 3, the mounting frame includes a third bracket 56 and a fourth bracket 57 for stabilizing the third bracket 56. The upper end of the first bracket 22 is concavely provided with a relief groove for installing the third bracket 56, and the relief groove penetrates through the first bracket 22 along the width direction of the first bracket 22. The third bracket 56 is horizontally disposed in the relief groove and extends out of the relief groove in both the forward and backward directions. The pressing cylinder 55 is disposed on the third support 56 and extends forward out of the upper end surface of the yielding groove portion, and an output shaft thereof penetrates through the third support 56 and then extends downward to be connected with the pressing block. The fourth bracket 57 is vertically disposed at the rear side of the first bracket 22, and the upper end thereof abuts against the lower end surface of the third bracket 56.

Referring to fig. 6 and 7, the second sliding rail assembly 52 is disposed at the front side of the first bracket 22, so that the second jig 51 can slide relative to the first bracket 22 to be pressed onto the first jig 4, and includes a plurality of second monorails 521 disposed on the first bracket 22 in parallel and uniformly spaced along the length direction of the second jig 51, and in the illustrated embodiment, the number of second monorails 521 is two. The front side of the first bracket 22 is provided with two parallel second clamping grooves 522 for installing two second monorails 521, and the two second clamping grooves 522 are vertically spaced along the length direction of the first bracket 22. The two second monorails 521 are respectively clamped in the two second clamping grooves 522. The lower ends of the two second clamping grooves 522 are respectively provided with a second protruding block 523 for vertically limiting the second monorail 521, and when the second monorail 521 is clamped in the second clamping groove 522, the lower end of the second monorail 521 is abutted with the upper end of the second protruding block 523. Two second sliding blocks 524 are respectively arranged at positions of the rear end face of the pressing block, corresponding to the two second monorails 521, the two second sliding blocks 524 are respectively and vertically connected with the corresponding second monorails 521 in a sliding manner, and friction force between the second sliding blocks 524 and the second monorails 521 is smaller than friction force between the second monorails 521 and the second clamping grooves 522.

Referring to fig. 8, 9 and 10, the gas path 3 includes a vacuum gas path 31 and a helium gas feeding path 32. The inner end of the vacuumizing air channel 31 is communicated with the second closed space 54, and the outer end is communicated with a vacuumizing device (not shown); the helium-feeding path 32 has an inner end communicating with the first closed space 424 and an outer end for communicating with a helium-feeding device (not shown). That is, the vacuum air passage 31 is provided at one side of the welding seam 12 of the battery case 1, the helium supply passage 32 is provided at the other side of the welding seam 12 of the battery case 1, and if the welding seam 12 is not tightly welded, the vacuum air passage 31 and the helium supply passage 32 may communicate through the welding seam 12, and thus, the air tightness of the welding seam 12 may be detected by detecting whether the vacuum air passage 31 and the helium supply passage 32 are ventilated.

The vacuumizing air passage 31 is arranged inside the pressing block and comprises two air passages arranged at intervals along the width direction of the pressing block. The two vacuum-pumping air passages 31 are vertically arranged, the inner ends of the two vacuum-pumping air passages extend towards the second groove 53 and penetrate through the lower groove wall of the second groove 53 to form a second air hole 36 and are communicated with the second airtight space 54, the outer ends of the two vacuum-pumping air passages extend upwards to penetrate through the upper end face of the pressing block, and the upper end face is provided with a vacuum-pumping joint 33 for connecting the vacuum-pumping air passages 31 with a vacuum-pumping device. The helium delivering channel 32 is disposed inside the first fixture 4, the inner end of the helium delivering channel extends towards the first groove 422 and penetrates through the lower groove wall of the first groove 422 to form a first air hole 35 and is communicated with the first closed space 424, the outer end of the helium delivering channel extends leftwards to penetrate through an end wall of the first fixture 4, and a helium delivering connector 34 for connecting the helium delivering channel 32 with the helium delivering device is disposed at the end wall.

The working mode of one embodiment of the blade battery case 1 helium detection jig is as follows: the battery case 1 to be detected is sleeved on the sleeved part 42, so that the welding seam 12 of the battery case 1 is aligned with the first groove 422, and the left end face of the battery case 1 is abutted with the abutting edges of the first limiting part 44 and the second limiting part 45. The pressing cylinder 55 is started, and an output shaft of the pressing cylinder 55 extends out to drive the pressing block to press down until the lower end of the first jig 4 is abutted to the upper end of the support column 481. During the downward movement of the pressing block, the pressing block drives the second sliding block 524 to move downward relative to the second monorail 521; the first jig 4 moves down to drive the first slider 434 to move down relative to the first monorail 431; the tension spring is stretched.

A vacuum-pumping device is connected to the vacuum-pumping joint 33, the second closed space 54 is vacuumized, the vacuumized second closed space 54 is connected with the leak detector, and helium gas is delivered into the first closed space 424 through the helium-gas-delivering joint 34. If the weld 12 of the battery case 1 is not tightly welded, helium gas in the first closed space 424 enters the second closed space 54 through the weld 12 of the battery case 1 and is detected by the leak detector. The two vacuum connectors 33 are provided, and a user can use one vacuum connector 33 to suck air, or can use two vacuum connectors 33 to suck air at the same time. The effect is that when one of the vacuum connectors 33 is damaged, the other vacuum connector 33 can be used, so that the whole jig is prevented from being scrapped due to the damage of one vacuum connector 33.

After the detection is finished, the output shaft of the pressing cylinder 55 is retracted, and the first jig 4 returns to the initial reset position under the resilience force of the tension spring. In this process, the press block drives the second slider 524 to move upward relative to the second monorail 521; the first jig 4 moves upwards to drive the first slider 434 to move upwards relative to the first monorail 431. Since the friction between the first slider 434 and the first rail 431 is smaller than the friction between the first rail 431 and the first clamping groove 432, and the friction between the second slider 524 and the second rail 521 is smaller than the friction between the second rail 521 and the second clamping groove 522, the first rail 431 does not slide in the first clamping groove 432 and the second rail 521 does not slide in the second clamping groove 522.

Claims (10)

1. The utility model provides a tool is examined to blade battery case helium for detect the gas tightness of blade battery case welding seam, include the support, locate spacing subassembly on the support and be used for carrying out the gas circuit that the leakproofness detected to the welding seam of battery case, its characterized in that: the limiting assembly comprises a first jig and a pressing mechanism, wherein the first jig is used for the battery shell to be sleeved on, and the pressing mechanism can be pressed on one side, opposite to the welding line, of the first jig; a first groove is formed in the position, facing the welding line, of the first jig, and a first airtight space is formed at the welding line between the first groove and the battery shell when the battery shell is sleeved on the first jig; a second groove is formed in one side, close to the first jig, of the pressing mechanism, and when the pressing mechanism is pressed on the battery shell, a second airtight space is formed at a welding seam of the second groove and the battery shell;

The gas circuit comprises a vacuumizing air passage and a helium feeding air passage, wherein the vacuumizing air passage is used for vacuumizing the first closed space or the second closed space, and the helium feeding air passage is used for feeding helium to the second closed space or the first closed space.

2. The blade battery case helium detection jig according to claim 1, wherein: the vacuum air passage is arranged on the pressing mechanism, the inner end of the vacuum air passage extends towards the second groove and penetrates through a groove wall of the second groove to form a second air hole and is communicated with the second airtight space, and the outer end of the vacuum air passage extends outwards and penetrates through the first jig; the helium delivery channel is arranged on the first jig, the inner end of the helium delivery channel extends towards the first groove and penetrates through a groove wall of the first groove to form a first air hole and is communicated with the first airtight space, and the outer end of the helium delivery channel extends outwards and penetrates through the first jig.

3. The blade battery case helium detection jig according to claim 1, wherein: the support is provided with first sliding rail assemblies distributed along the vertical direction, and the first jig is in sliding fit with the first sliding rail assemblies so as to enable the first jig to slide along the vertical direction; the support is also provided with a supporting component, and the first jig can be supported on the supporting component after being downwards moved; the support is also provided with an elastic resetting piece, the first jig can be reset upwards under the action of the elastic resetting piece, and when the first jig is at an initial resetting position, a first gap is formed between the upper end face of the first jig and the lower end face of the pressing mechanism, and a second gap is formed between the lower end face of the first jig and the supporting face of the supporting component.

4. The blade battery case helium detection jig according to claim 3, wherein: the first jig comprises a connecting part in sliding fit with the first sliding rail assembly and a sleeving part for sleeving the battery shell, and the first groove is formed in the position, corresponding to the welding seam of the battery shell, of the upper end face of the connecting part.

5. The blade battery case helium detection jig according to claim 4, wherein: the first sliding rail assembly comprises a plurality of first monorails which are arranged on the support in parallel along the length direction of the first jig, each first monorail extends along the vertical direction, and the connecting part is in sliding connection with each first monorail; the supporting assembly comprises at least two supporting upright posts, at least one supporting upright post is arranged below the connecting part in a standing mode, and at least one supporting upright post is arranged below one end, far away from the connecting part, of the sleeving part; the elastic resetting piece is limited to be arranged on the tension spring above the first jig, the upper end of the tension spring is fixedly arranged on the support, and the lower end of the tension spring is connected with the connecting part.

6. The blade battery case helium detection jig according to claim 4, wherein: the upper end face of the sleeving part is concaved downwards to form a through groove, the through groove penetrates through the sleeving part in the width direction of the sleeving part, the length of the through groove is larger than that of the battery case, the first groove is formed by downwards concavely arranging the lower wall of the through groove, a sealing ring is arranged in the through groove, and the sealing ring is arranged around the periphery of the first groove and is jointly enclosed with the first groove and the battery case to form a first closed space.

7. The blade battery case helium detection jig according to claim 4, wherein: the battery pack is characterized in that a limiting unit is arranged at one end, close to the connecting portion, of the sleeving portion, the limiting unit comprises a first limiting portion and a second limiting portion which are symmetrically arranged on the front side face and the back side face of the sleeving portion, one side face, far away from the connecting portion, of the first limiting portion and the second limiting portion is limited to be a propping edge distributed along the vertical direction, and the end portion of the battery pack is propped against the propping edge.

8. The blade battery case helium detection jig according to claim 4, wherein: the one end that keeps away from on the connecting portion overlap and establish the portion is provided with helium and examines the gas joint, the outer end of sending helium air flue outwards link up on the connecting portion keep away from overlap the one end of establishing the portion with helium examines the gas joint intercommunication, send the inner end of helium air flue to overlap establish the portion direction and extend and link up the groove diapire of first recess, in order with first airtight space intercommunication.

9. The blade battery case helium detection jig according to claim 1, wherein: the support is provided with a second sliding rail component positioned above the first jig; the pressing mechanism comprises a second jig and a driving assembly, wherein the second jig is in sliding fit with the second sliding rail assembly, the driving assembly is arranged on the support and used for driving the second jig to vertically move, the second groove is formed by upwards concavely arranging the lower end face of the second jig, and the second groove is opposite to the first groove.

10. The blade battery case helium detection jig according to claim 9, wherein: the upper end face of the second jig is provided with a vacuumizing connector, the outer end of the vacuumizing air passage is communicated with the vacuumizing connector, and the inner end of the vacuumizing air passage is downwards communicated with the bottom wall of the second groove so as to be communicated with the second closed space.