CN217687778U

CN217687778U - Square lithium battery sealing performance detection device

Info

Publication number: CN217687778U
Application number: CN202220763015.3U
Authority: CN
Inventors: 徐强; 矫贺东; 钟祥龙
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2022-10-28
Anticipated expiration: 2032-04-02

Abstract

The utility model provides a square lithium cell leakproofness detection device, include: a mounting frame; the rotary clamping mechanism is arranged at the upper part of the mounting frame and comprises a clamping component and a rotating component, the clamping component is used for clamping and extruding the square lithium battery, and the rotating component is used for driving the square lithium battery to rotate; detection mechanism, including collecting tank, conducting rod and feedback device, the collecting tank slope sets up in the mounting bracket lower part, and just to rotatory fixture for collect the electrolyte that square lithium cell revealed, the fixed setting of conducting rod is at the collecting tank lower extreme, and the one end of conducting rod contacts with the collecting tank lower extreme, and the other end carries out the electricity with feedback device and is connected, feedback device is used for feeding back the conducting rod condition of switching on. The device is simple in structure, can quickly detect the sealing performance of the square lithium battery, and can avoid the occurrence of manual missing detection.

Description

Square lithium cell leakproofness detection device

Technical Field

The utility model relates to a lithium cell detects technical field, especially relates to a square lithium cell leakproofness detection device.

Background

With the rapid development of modern society, the appearance of new energy industry has very important meaning. The lithium ion battery has the advantages of high energy density, no memory effect, small environmental pollution and the like, and is widely applied to a plurality of fields at present. At present, the square aluminum shell lithium battery is lack of judgment basis of sealing quality after sealing, and the battery cell directly flows to the next procedure after appearance detection or helium detection qualification after sealing, so that an abnormal battery cell easily flows into a client.

At the present stage, square aluminum hull lithium cell seals the back, mainly relies on the manual work to detect its leakproofness, mainly observes the lithium cell whether have the crack, and then judges the lithium cell whether have the risk of revealing electrolyte. This kind of mode is only to the more obvious crack in lithium cell surface, when there is tiny crack on lithium cell surface, the manual work is difficult to in time discover, probably need detect through dedicated detecting instrument, because electrolyte fills in electric core, under quiescent condition, electrolyte can not reveal from tiny crack, nevertheless if these bad lithium cells flow to the customer end after, because the lithium cell when using, just can leak out from the tiny crack on battery surface slowly after the chemical reaction takes place for electrolyte, lead to the lithium cell to break down. Therefore, the existing method for detecting the sealing performance of the square lithium battery in a manual mode still has the problem of missed detection.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a square lithium cell leakproofness detection device when solving artifical square lithium cell leakproofness and detecting, has the problem of lou examining.

The technical scheme of the utility model is realized like this:

the utility model provides a square lithium cell leakproofness detection device, include:

a mounting frame;

the rotary clamping mechanism is arranged on the upper portion of the mounting frame and comprises a clamping assembly and a rotating assembly, the clamping assembly is used for clamping and extruding the square lithium battery, and the rotating assembly is used for driving the square lithium battery to rotate;

detection mechanism, including collecting tank, conducting rod and feedback device, the collecting tank slope sets up in the mounting bracket lower part, and just to rotatory fixture for collect the electrolyte that square lithium cell was revealed, the conducting rod is fixed to be set up at the collecting tank lower extreme, and the one end and the collecting tank lower extreme of conducting rod contact, and the other end carries out the electricity with feedback device and is connected, feedback device is used for feeding back the conducting rod condition of switching on.

On the basis of the technical scheme, preferably, the mounting bracket includes left mounting panel and right mounting panel of base and vertical parallel arrangement on the base, rotatory fixture level sets up on left mounting panel and right mounting panel, detection mechanism installs on the base.

Further, it is preferred, the centre gripping subassembly includes first splint, second splint, first bearing, second bearing and die clamping cylinder, the vertical setting of first splint is at left mounting panel inside wall, the vertical setting of second splint is at right mounting panel inside wall, and first splint rotate with left mounting panel through first bearing and are connected, and second splint rotate with right mounting panel through the second bearing to be connected, and die clamping cylinder's stiff end fixed mounting is on right mounting panel outside wall, and its flexible end passes right mounting panel and rotates with the second bearing to be connected.

Furthermore, preferably, the rotating assembly includes a motor and a speed reducer, the speed reducer is fixedly mounted on the outer side wall of the left mounting plate, an output shaft of the motor is fixedly connected with an input shaft of the speed reducer, and the output shaft of the speed reducer passes through the left mounting plate and the first bearing and is fixedly connected with the first clamping plate.

On the basis of above-mentioned technical scheme, it is preferred, all be provided with tight adjusting part of clamp on the inside wall of first splint and second splint, tight adjusting part of clamp includes backup pad, first board, second and decides board, fly leaf and adjusting screw, the backup pad level sets up at first splint or second splint inside wall, and the vertical interval fixed mounting of board is decided to first board and second in the backup pad, and the vertical setting of fly leaf is decided between board at first board and second, and the adjusting screw level passes the second and decides the board, and decides board threaded connection with the second, and adjusting screw's one end and fly leaf rotate to be connected.

On the basis of the technical scheme, preferably, the conducting rod comprises a positive rod and a negative rod, the positive rod and the negative rod are arranged at the lowest end of the liquid collecting tank side by side, a gap is formed between the positive rod and the negative rod, and the positive rod and the negative rod are respectively connected with the feedback device.

Further, preferably, the feedback device comprises a controller and a warning light, wherein the input end of the controller is connected with the conductive rod, and the output end of the controller is connected with the warning light.

Preferably, the sump is attached with a hydrophobic coating.

Preferably, first splint, second splint and tight adjusting part of clamp all set up to non-metallic material.

Preferably, the detection mechanism further comprises a liquid discharge pipe, and the liquid discharge pipe is connected with the lowest end of the liquid collecting tank.

The utility model discloses for prior art following beneficial effect has:

(1) The utility model discloses a square lithium cell leakproofness detection device, through setting up rotatory fixture, utilize the centre gripping subassembly to carry out the centre gripping and exert certain extrusion force to square lithium cell, when there is the crack on square lithium cell surface, the inside electric liquid of battery can pass through the crack under the extrusion force effect and reveal the department, utilize the rotating assembly can drive square lithium cell and rotate, can make the electric liquid that the battery surface optional position revealed flow into the collecting tank downwards, after the conducting rod contacted the electrolyte in the collecting tank, the conducting rod switches on, and feed back through feedback device, and then judge that whether the battery has the leakproofness bad, and have the weeping risk; the device has a simple structure, can quickly detect the sealing performance of the square lithium battery, and can avoid the occurrence of manual omission detection;

(2) The clamping adjusting assembly is arranged, so that the clamping of square lithium batteries with different thicknesses can be adapted, the clamping effect of the square lithium batteries can be more stable by matching with the use of the clamping assembly, and the lithium batteries are prevented from falling off from the rotary clamping mechanism in the rotating process to influence the detection;

(3) The controller and the warning lamp are designed on the feedback device, the input end of the controller is connected with the conductive rod, the output end of the controller is connected with the warning lamp, the positive rod and the negative rod can be conducted when contacting with the electrolyte, and the controller controls the warning lamp to work after receiving the level signal, so that the leakage of the battery is judged;

(4) Through attaching to have hydrophobic coating on the collecting tank, can make the electrolyte that falls into in the collecting tank through the quick liquid collecting tank bottom that flows of hydrophobic coating to contacted by the conducting rod, avoid electrolyte adhesion to the collecting tank inner wall, influence its flow.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic plan view of a device for detecting the sealing performance of a square lithium battery disclosed by the present invention;

fig. 2 is a schematic view of the working state structure of the device for detecting the sealing property of a square lithium battery disclosed by the present invention;

fig. 3 is a schematic plan view of the clamping adjustment assembly of the present invention;

FIG. 4 is an enlarged view of a portion A of FIG. 2;

the attached drawings are as follows:

1. a mounting frame; 2. rotating the clamping mechanism; 21. a clamping assembly; 22. a rotating assembly; 3. a detection mechanism; 31. a liquid collecting tank; 32. a conductive rod; 33. a feedback device; 11. a left mounting plate; 12. a right mounting plate; 13. a base; 211. a first splint; 212. a second splint; 213. a first bearing; 214. a second bearing; 215. a clamping cylinder; 221. a motor; 222. a speed reducer; 23. a clamping adjustment assembly; 231. a support plate; 232. a first stationary plate; 233. a second stationary plate; 234. a movable plate; 235. adjusting the screw rod; 321. a positive electrode bar; 322. a negative electrode bar; 331. a controller; 332. a warning light; 34. and a liquid discharge pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in FIG. 1, combine FIG. 2, the embodiment of the utility model discloses a square lithium battery leakproofness detection device, including mounting bracket 1, rotary clamping mechanism 2 and detection mechanism 3.

Wherein, mounting bracket 1 is used for installing rotary clamping mechanism 2 and detection mechanism 3, and mounting bracket 1 can fix on detecting the platform when in actual use, also can install on other check out test set.

Rotatory fixture 2 sets up on 1 upper portion of mounting bracket, including centre gripping subassembly 21 and rotating assembly 22, centre gripping subassembly 21 is used for carrying out the centre gripping extrusion to square lithium cell, through giving the certain extrusion force of lithium cell, when there is certain crack or when having sealed clearance on the lithium cell surface, the lithium cell is receiving the extrusion back, and the inside electrolyte of lithium cell can leak out through crack or sealed clearance, and then can judge that lithium cell leakproofness is bad.

For the convenience quick detection that the leakproofness is bad in the lithium cell, receive the extrusion back at the lithium cell, electrolyte can be revealed to the bad battery of leakproofness, because artifical observation electrolyte reveals consuming time, also leaks easily and examines, for this reason, through setting up detection mechanism 3, can receive electrolyte through detection mechanism 3, whether the leakproofness is bad for coming the quick judgement lithium cell, and has the weeping risk.

Specifically, detection mechanism 3, including collecting tank 31, conducting rod 32 and feedback device 33, the slope of collecting tank 31 sets up in 1 lower part of mounting bracket, and just to rotatory fixture 2 for collect the electrolyte that square lithium cell revealed, the fixed setting of conducting rod 32 is at the collecting tank 31 least significant end, and the one end and the collecting tank 31 least significant end of conducting rod 32 contact, and the other end carries out the electricity with feedback device 33 and is connected, and feedback device 33 is used for feeding back the conducting rod 32 condition of switching on.

From this setting, the lithium cell is when receiving the extrusion, and the electrolyte can outwards be revealed to the poor lithium cell of leakproofness, and electrolyte flows into the collecting tank 31 downwards, and after the conducting rod 32 contacted the electrolyte in the collecting tank 31, the conducting rod 32 switched on to feed back through feedback device 33, and then judge whether there is the poor leakproofness in the battery, and there is the weeping risk.

Because the lithium cell is pressing from both sides tightly the in-process of exerting pressure by centre gripping subassembly 21, the crack on lithium cell surface is not necessarily all present in lithium cell lower surface, also can be present in lithium cell upper surface or other positions, from this one, can flow along lithium cell surface after electrolyte is revealed when the extrusion to attached to lithium cell surface, when revealing the volume less, electrolyte can't be collected by collecting tank 31, and then can take place to leak and examine the problem.

Therefore, this embodiment is through rotating assembly 22, and the lithium cell rotates, and when being worth noting, rotating assembly 22 can control the rotation speed of lithium cell, keeps the lithium cell rotatory at a slow speed, and then can make the liquid of the electric liquid that leaks in lithium cell surface optional position flow into the collecting tank 31 downwards to the quick quilt is detected out by conducting rod 32.

The device is simple in structure, can quickly detect the sealing performance of the square lithium battery, and can avoid the occurrence of manual missing detection.

For the convenience of installing the rotary clamping mechanism 2 and the detection mechanism 3, the mounting bracket 1 of the embodiment includes a base 13, a left mounting plate 11 and a right mounting plate 12, and the left mounting plate 11 and the right mounting plate 12 are vertically and parallelly fixed on the base 13. Detection mechanism 3 installs on base 13, and rotary clamping mechanism 2 level sets up on left mounting panel 11 and right mounting panel 12, and from this one, when the centre gripping extrusion rotation was carried out to the lithium cell on rotary clamping mechanism 2, the electrolyte that the lithium cell that the leakproofness is bad revealed can directly fall into detection mechanism 3 to realize the weeping and detect.

As some preferred embodiments, the clamping assembly 21 includes a first clamping plate 211, a second clamping plate 212, a first bearing 213, a second bearing 214, and a clamping cylinder 215. First splint 211 is vertical to be set up at left mounting panel 11 inside wall, and the vertical setting of second splint 212 is at right mounting panel 12 inside wall, and first splint 211 rotates with left mounting panel 11 through first bearing 213 to be connected, and second splint 212 rotates with right mounting panel 12 through second bearing 214 to be connected, and die clamping cylinder 215's stiff end fixed mounting is on right mounting panel 12 outside wall, and its flexible end passes right mounting panel 12 and rotates with second bearing 214 to be connected. From this setting, when carrying out square lithium battery centre gripping, place square lithium battery between first splint 211 and second splint 212, make first splint 211 and second splint 212 laminate lithium battery length direction side respectively, stretch out and draw back the end through die clamping cylinder 215 and promote second splint 212 to first splint 211 direction removal, because first splint 211 rotates with left mounting panel 11 through first bearing 213 to be connected, first splint 211 does not take place the displacement at the horizontal direction, therefore, remove to first splint 211 through second splint 212, can press from both sides tightly the lithium battery, adjust the extension volume of the flexible end of die clamping cylinder 215, can adjust the extrusion force that the lithium battery received. By providing the first bearing 213 and the second bearing 214, the first clamping plate 211 and the second clamping plate 212 can rotate relative to the left mounting plate 11 and the clamping cylinder 215 after clamping the lithium battery.

In order to drive the lithium battery to rotate, the rotating assembly 22 in this embodiment includes a motor 221 and a speed reducer 222, the speed reducer 222 is fixedly mounted on an outer side wall of the left mounting plate 11, an output shaft of the motor 221 is fixedly connected with an input shaft of the speed reducer 222, and an output shaft of the speed reducer 222 passes through the left mounting plate 11 and the first bearing 213 and is fixedly connected with the first clamping plate 211. From this setting, reduction gear 222 reduces the rotational speed of motor 221, outputs low-speed high torque to drive first splint 211, lithium cell and second splint 212 and rotate around first bearing 213 and second bearing 214, through the low-speed rotation, can avoid the high-speed rotation of lithium cell, the electrolyte that lithium cell surface was revealed splashes away.

Because the lithium battery needs to rotate in the clamping process, in order to keep the clamping stability of the lithium battery, in this embodiment, the clamping adjusting assemblies 23 are disposed on the inner side walls of the first clamping plate 211 and the second clamping plate 212, referring to fig. 3, each clamping adjusting assembly 23 includes a supporting plate 231, a first fixed plate 232, a second fixed plate 233, a movable plate 234, and an adjusting screw 235, the supporting plate 231 is horizontally disposed on the inner side wall of the first clamping plate 211 or the second clamping plate 212, the first fixed plate 232 and the second fixed plate 233 are vertically and fixedly mounted on the supporting plate 231 at intervals, the movable plate is vertically disposed between the first fixed plate 232 and the second fixed plate 233, the adjusting screw 235 horizontally penetrates through the second fixed plate 233 and is in threaded connection with the second fixed plate 233, and one end of the adjusting screw 235 is rotatably connected with the movable plate. From this setting, under the initial condition, with lithium cell width direction both sides respectively vertical insert two sets of tight adjusting part 23 of clamp, it is concrete, vertically insert between first fixed plate 232 and fly leaf 234 with the lithium cell, then through rotating adjusting screw 235, adjusting screw 235 rotates on second fixed plate 233, and then drive the fly leaf and remove towards first fixed plate 232 direction, make first fixed plate 232 and fly leaf 234 block lithium cell thickness direction, then rethread clamping cylinder 215 drive second splint 212 removes towards first splint 211, accomplish the clamp to the lithium cell, guarantee that lithium cell both sides face is pressed from both sides the centre gripping by adjusting part 23, first splint 211 and second splint 212 carry out the centre gripping to lithium cell width direction lateral wall, the length direction top surface and the bottom surface of lithium cell are in the fretwork form, make things convenient for the weeping after to drip downwards. Simultaneously, the clamping adjusting assembly 23 disclosed by the embodiment can also be suitable for clamping lithium batteries with different thicknesses, and is wider in adaptability.

In some preferred embodiments, referring to fig. 4, the conducting bars 32 include a positive bar 321 and a negative bar 322, the positive bar 321 and the negative bar 322 are arranged at the lowest end of the liquid collecting tank 31 side by side, a gap is arranged between the positive bar 321 and the negative bar 322, and the positive bar 321 and the negative bar 322 are respectively connected with the feedback device 33. With this arrangement, when the liquid collecting tank 31 receives the electrolyte, the electrode liquid flows to the lowest end along the inclined liquid collecting tank 31 and falls between the positive electrode rod 321 and the negative electrode rod 322, the positive electrode rod 321 and the negative electrode rod 322 are conducted by the electrode liquid conductive medium, and the feedback device 33 feeds back the level signal.

Specifically, the feedback device 33 includes a controller 331 and a warning light 332, an input end of the controller 331 is connected to the conductive rod 32, and an output end of the controller 331 is connected to the warning light 332. When the positive electrode rod 321 and the negative electrode rod 322 are conducted when contacting the electrolyte, the controller 331 controls the operation of the warning light 332 after receiving the level signal, and further determines that the battery has a leakage. In this embodiment, the controller 331 can be a control circuit board, and when the conductive rod 32 is turned on, the control circuit board controls the warning light 332 to light up, so that it can be determined that the lithium battery to be detected is a battery with poor sealing performance, and a leaked liquid exists, and the repair or the scrapping treatment is required.

Since the leakage of the battery is usually leakage and the leakage amount of the electrolyte is not large, when the electrolyte drops onto the liquid collecting tank 31, the electrolyte may adhere to the surface of the liquid collecting tank 31 and cannot flow onto the conductive rod 32, and thus detection cannot be achieved, for this reason, a hydrophobic coating such as polytetrafluoroethylene is attached to the liquid collecting tank 31 in the present embodiment. Through attaching hydrophobic coating (not shown in the figure) on the collecting tank 31, can make the electrolyte that falls into in the collecting tank 31 flow to the collecting tank 31 bottom through hydrophobic coating is quick to contacted by conducting rod 32, avoid electrolyte adhesion to collecting tank 31 inner wall, influence its flow

Preferably, the first clamping plate 211, the second clamping plate 212 and the clamping adjusting assembly 23 are all made of non-metal materials, so that damage to the surface of the lithium battery caused by clamping and pressing of the lithium battery can be avoided.

Preferably, the detection mechanism 3 further comprises a drain pipe 34, and the drain pipe 34 is connected to the lowest end of the sump 31. With this arrangement, the electrolyte dropped into the catch tank 31 can be discharged and collected through the drain pipe 34.

The utility model discloses a theory of operation is:

placing a square lithium battery to be tested on the clamping adjusting assembly 23 on the inner walls of the first clamping plate 211 and the second clamping plate 212, firstly clamping the side surface, then driving the second clamping plate 212 to move towards the first clamping plate 211 through the clamping cylinder 215 to apply a certain extrusion force to the lithium battery, and driving the lithium battery to rotate through the rotating assembly 22, wherein the electro-hydraulic liquid leaked from any position on the surface of the battery downwards flows into the liquid collecting tank 31, when the conductive rod 32 contacts with the electrolyte in the liquid collecting tank 31, the conductive rod 32 is conducted, and the controller 331 controls the warning lamp 332 to work after receiving a level signal, so as to judge the leakage of the battery; when the battery needs to be taken out, the clamping cylinder 215 is reversed.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a square lithium cell leakproofness detection device which characterized in that includes:

a mounting frame (1);

the rotary clamping mechanism (2) is arranged on the upper portion of the mounting frame (1) and comprises a clamping assembly (21) and a rotating assembly (22), the clamping assembly (21) is used for clamping and extruding the square lithium battery, and the rotating assembly (22) is used for driving the square lithium battery to rotate;

detection mechanism (3), including collecting tank (31), conducting rod (32) and feedback device (33), collecting tank (31) slope sets up in mounting bracket (1) lower part, and just to rotatory fixture (2) for collect the electrolyte that square lithium cell revealed, conducting rod (32) are fixed to be set up in collecting tank (31) lower extreme, and the one end and the collecting tank (31) lower extreme of conducting rod (32) contact, and the other end carries out the electricity with feedback device (33) and is connected, feedback device (33) are used for feeding back conducting rod (32) condition.

2. The apparatus for testing the sealing performance of a square lithium battery as claimed in claim 1, wherein: mounting bracket (1) includes left mounting panel (11) and right mounting panel (12) of base (13) and vertical parallel arrangement on base (13), rotatory fixture (2) level sets up on left mounting panel (11) and right mounting panel (12), detection mechanism (3) are installed on base (13).

3. The apparatus for testing the sealing performance of a lithium prismatic battery according to claim 2, wherein: centre gripping subassembly (21) include first splint (211), second splint (212), first bearing (213), second bearing (214) and die clamping cylinder (215), first splint (211) are vertical to be set up in left mounting panel (11) inside wall, second splint (212) are vertical to be set up in right mounting panel (12) inside wall, and first splint (211) rotate with left mounting panel (11) through first bearing (213) to be connected, and second splint (212) rotate with right mounting panel (12) through second bearing (214) to be connected, and the stiff end fixed mounting of die clamping cylinder (215) is on right mounting panel (12) lateral wall, and its flexible end passes right mounting panel (12) and rotates with second bearing (214) to be connected.

4. The apparatus for testing the sealing performance of a lithium prismatic battery according to claim 3, wherein: the rotating assembly (22) comprises a motor (221) and a speed reducer (222), the speed reducer (222) is fixedly mounted on the outer side wall of the left mounting plate (11), an output shaft of the motor (221) is fixedly connected with an input shaft of the speed reducer (222), and an output shaft of the speed reducer (222) penetrates through the left mounting plate (11) and the first bearing (213) and is fixedly connected with the first clamping plate (211).

5. The apparatus for testing the sealing performance of a lithium prismatic battery according to claim 3, wherein: all be provided with on the inside wall of first splint (211) and second splint (212) and press from both sides tight adjusting part (23), press from both sides tight adjusting part (23) including backup pad (231), first fixed plate (232), second fixed plate (233), fly leaf (234) and adjusting screw (235), backup pad (231) level sets up in first splint (211) or second splint (212) inside wall, and first fixed plate (232) and the vertical interval fixed mounting of second fixed plate (233) are on backup pad (231), and fly leaf (234) vertical setting is between first fixed plate (232) and second fixed plate (233), and adjusting screw (235) level passes second fixed plate (233), and with second fixed plate (233) threaded connection, the one end of adjusting screw (235) with fly leaf (234) rotation connection.

6. The apparatus for testing the sealing performance of a square lithium battery as claimed in claim 1, wherein: the current conducting rod (32) comprises a positive rod (321) and a negative rod (322), the positive rod (321) and the negative rod (322) are arranged at the lowest end of the liquid collecting tank (31) side by side, a gap is formed between the positive rod (321) and the negative rod (322), and the positive rod (321) and the negative rod (322) are connected with the feedback device (33) respectively.

7. The apparatus for testing the sealing performance of a square lithium battery as claimed in claim 6, wherein: the feedback device (33) comprises a controller (331) and a warning lamp (332), wherein the input end of the controller (331) is connected with the conductive rod (32), and the output end of the controller (331) is connected with the warning lamp (332).

8. The apparatus for testing the sealing performance of a lithium prismatic battery according to claim 1, wherein: the liquid collecting groove (31) is attached with a hydrophobic coating.

9. The apparatus for testing the sealing performance of a lithium prismatic battery according to claim 5, wherein: first splint (211), second splint (212) and press from both sides tight adjusting part (23) and all set up to non-metallic material.

10. The apparatus for testing the sealing performance of a lithium prismatic battery according to claim 1, wherein: the detection mechanism (3) further comprises a liquid discharge pipe (34), and the liquid discharge pipe (34) is connected with the lowest end of the liquid collection groove (31).