阅读说明：本技术 一种用于电池批量成组式压氦真空箱法检漏的密封对接机构 (Sealing butt joint mechanism for battery batch grouping type helium pressing vacuum box method leak detection ) 是由 张果 蓝峰 李健 瞿骑龙 雷福元 钟林 王华仙 于 2019-09-09 设计创作，主要内容包括：本发明提供一种用于电池批量成组式压氦真空箱法检漏的密封对接机构,包括支架、导杆、支撑块、复位件、工件定位机构、顶升机构、导向块、密封罩,其中,支架包括互相平行且竖直设置的基准板与安装板；导杆水平设置于基准板与安装板之间；工件定位机构设置于导杆下部,工件定位机构上若干沿与导杆平行的方向排列的安装槽；支撑块为依次套设于导杆上的若干方形支撑块且沿导杆在基准板与安装板之间滑动,所述支撑块上设置通孔；复位机构设置于安装板上；顶升机构设置于导杆上部；密封罩设置于支撑块上部,密封罩的上端与顶升机构连接且可相对于顶升机构在与导杆平行的水平线上往复移动,密封罩的下端设置定位止口。(the invention provides a sealing butt joint mechanism for battery batch grouping type helium pressing vacuum box method leak detection, which comprises a bracket, a guide rod, a supporting block, a resetting piece, a workpiece positioning mechanism, a jacking mechanism, a guide block and a sealing cover, wherein the bracket comprises a reference plate and an installation plate which are parallel to each other and are vertically arranged; the guide rod is horizontally arranged between the reference plate and the mounting plate; the workpiece positioning mechanism is arranged at the lower part of the guide rod, and a plurality of mounting grooves are arranged on the workpiece positioning mechanism along the direction parallel to the guide rod; the supporting blocks are a plurality of square supporting blocks which are sequentially sleeved on the guide rod and slide between the reference plate and the mounting plate along the guide rod, and through holes are formed in the supporting blocks; the resetting mechanism is arranged on the mounting plate; the jacking mechanism is arranged on the upper part of the guide rod; the sealing cover is arranged on the upper portion of the supporting block, the upper end of the sealing cover is connected with the jacking mechanism and can move in a reciprocating mode on a horizontal line parallel to the guide rod relative to the jacking mechanism, and the lower end of the sealing cover is provided with a positioning spigot.)

1. a sealed docking mechanism for battery batch grouping type helium pressing vacuum box method leak detection is characterized by comprising a bracket, a guide rod, a supporting block, a resetting piece, a workpiece positioning mechanism, a jacking mechanism, a guide block and a sealing cover;

The support comprises a reference plate and an installation plate which are parallel to each other and are vertically arranged;

the guide rod is horizontally arranged between the reference plate and the mounting plate;

the workpiece positioning mechanism is arranged at the lower part of the guide rod, and a plurality of mounting grooves which are arranged in the direction parallel to the guide rod are arranged on the workpiece positioning mechanism;

the supporting blocks are a plurality of square supporting blocks which are sequentially sleeved on the guide rod and correspond to the mounting grooves one by one, the supporting blocks slide between the reference plate and the mounting plate along the guide rod, and through holes which vertically penetrate through the supporting blocks are formed in the supporting blocks;

the resetting mechanism is arranged on the mounting plate and corresponds to the supporting block next to the mounting plate;

The jacking mechanism is arranged on the upper part of the guide rod and is close to or far away from the support block in the vertical direction relative to the support block;

The sealing cover is arranged on the upper portion of the supporting block and is in movable fit with the through hole in the supporting block, the upper end of the sealing cover is connected with the jacking mechanism and can move back and forth on a horizontal line parallel to the guide rod relative to the jacking mechanism, and the lower end of the sealing cover is provided with a positioning spigot.

2. the seal butting mechanism for battery batch pack type helium pressure vacuum box method leak detection according to claim 1, wherein the jacking mechanism comprises a jacking cylinder and a guide block, the guide block is arranged between the jacking cylinder and the support block and is driven by the jacking cylinder to be vertically close to or far away from the support block, a guide groove is arranged at the lower part of the guide block, a connecting block matched with the guide groove is arranged at the upper part of the seal cover, and the seal cover is installed in the guide groove through the connecting block and can horizontally move between the reference plate and the installation plate along the guide groove.

3. The seal docking mechanism for leak detection in battery batch pack under pressure helium vacuum chamber as claimed in claim 1, wherein a through hole is provided in the seal housing and axially penetrates through the seal housing, a seal ring is provided between the top of the connecting block of the seal housing and the wall of the guide groove, and a passage is provided in the guide block and extends from the guide groove to the side of the guide block.

4. the seal docking mechanism as claimed in claim 1, wherein the restoring mechanism comprises a plunger, a supporting sleeve, and a spring, the mounting plate is provided with a through hole corresponding to the supporting block, the plunger is inserted into the through hole and contacts with the supporting block, the spring sleeve is screwed with the through hole on the mounting plate and movably engaged with the plunger, the end wall of the end of the plunger contacting with the supporting block extends radially outward to form a plunger, and the spring is disposed between the spring sleeve and the plunger.

Technical Field

the invention belongs to the technical field of lithium battery vacuum leak detection, and particularly relates to a sealing butt joint mechanism for battery batch grouping type helium pressing vacuum box method leak detection.

background

Lithium batteries are a type of battery using a non-aqueous electrolyte solution and using lithium metal or lithium alloy as a negative electrode material and are used in various end products requiring long-term energy storage. When the lithium battery is produced, leakage detection is needed at the welding position of the shell, if electrolyte in the lithium battery leaks out due to the non-tightness of the shell and can produce violent reaction with a humid environment, serious harm is caused to the environment and personnel, and the service life of equipment is influenced, so that leakage detection is needed by the lithium battery. And because of production and cost control demands, the detection of the single battery core leakage needs to be divided into two links, wherein one link is positive pressure detection before liquid injection, and the other link is detection after liquid injection. The detection after the liquid injection needs the sealed sealing lid of gluey nail after annotating the liquid hole because of the battery after annotating the liquid, and this department has formed the double-layered chamber, and the helium gas department that prefills during conventional notes liquid has the hourglass and examines the risk, and this department is airtight cavity after the welding, consequently this department need adopt the helium pressure vacuum chamber method to carry out leak testing, and the helium pressure vacuum chamber method detects in the helium pressure process, and in order to guarantee that the helium gas gets into the helium gas volume inside the product through the less small leak hole of product enough, form the stability and the reliability that satisfy follow-up leak testing signal, and the helium pressure time. Therefore, the helium pressure vacuum box method leak detection is generally carried out on batch helium pressure in groups under the condition of meeting production requirements.

When carrying out the helium of batch in groups to the lithium cell and examining, because of need independently judge and gather single battery leakage data, so set up on the leak hunting equipment that adopts and arrange the corresponding leak hunting station group that forms by a plurality of leak hunting stations in proper order, the sealed cowling that every station corresponds the adaptation forms sealed cowling group. When helium is pressed, the batteries are sequentially placed in the station to form a battery pack, the sealing cover is butted with the batteries of the battery pack respectively, then helium pressing is carried out, helium is pressed into the batteries through the leakage holes of the leakage batteries, and the helium pressing time is set independently according to needs; during leakage detection, the batteries are sequentially placed in the station to form a battery pack, and the leakage detection is performed after the sealing cover is respectively butted with the batteries of the battery pack. When the first battery at the edge of a row of batteries to be detected is used as a reference for butt joint, the last battery is often difficult to butt joint with a corresponding sealing joint due to excessive deviation from a standard station due to the existence of accumulated errors.

Disclosure of Invention

Based on the problems, the invention aims to provide a sealing butt joint mechanism for battery batch group type helium pressing vacuum box method leak detection.

in order to achieve the above purpose, the invention adopts the technical scheme that: a sealed docking mechanism for battery batch grouping type helium pressing vacuum box method leak detection comprises a bracket, a guide rod, a supporting block, a resetting mechanism, a workpiece positioning mechanism, a jacking mechanism, a guide block and a sealing cover;

The support comprises a reference plate and an installation plate which are parallel to each other and are vertically arranged;

The guide rod is horizontally arranged between the reference plate and the mounting plate;

The workpiece positioning mechanism is arranged at the lower part of the guide rod, and a plurality of mounting grooves which are arranged in the direction parallel to the guide rod are arranged on the workpiece positioning mechanism;

The supporting blocks are a plurality of square supporting blocks which are sequentially sleeved on the guide rod and correspond to the mounting grooves one by one, the supporting blocks slide between the reference plate and the mounting plate along the guide rod, and through holes which vertically penetrate through the supporting blocks are formed in the supporting blocks;

The resetting mechanism is arranged on the mounting plate and corresponds to the supporting block next to the mounting plate;

The jacking mechanism is arranged on the upper part of the guide rod and is close to or far away from the support block in the vertical direction relative to the support block;

the sealing cover is arranged on the upper portion of the supporting block and is in movable fit with the through hole in the supporting block, the upper end of the sealing cover is connected with the jacking mechanism and can move back and forth on a horizontal line parallel to the guide rod relative to the jacking mechanism, and the lower end of the sealing cover is provided with a positioning spigot.

The invention provides a sealing butt joint mechanism for battery batch group type helium pressing vacuum box method leak detection, which adopts a set of sealing butt joint mechanism as a helium pressing mechanism, and a sealing cover of the helium pressing mechanism is connected with a workpiece vacuum pumping system and a helium source. The other set of sealing butt joint mechanism is used as a leakage detection mechanism, a sealing cover of the leakage detection mechanism is connected with a vacuum pumping system and a helium mass spectrum leakage detector, and the using method is as follows:

step 1, helium pressing: placing a workpiece positioning mechanism with a battery to be detected in the mounting groove below a supporting block of a helium pressing mechanism, wherein a resetting mechanism keeps the supporting blocks in close arrangement in sequence on the basis of a reference plate, starting a first jacking mechanism next to the reference plate in the helium pressing mechanism, the jacking mechanism drives a first sealing cover next to the reference plate to descend, penetrate through a through hole of the first supporting block next to the reference plate and then butt joint with a first battery to be detected next to the reference plate, then butt joint the rest sealing covers one by one in sequence, starting a vacuumizing device to respectively vacuumize the battery to be detected, finally respectively pressing helium on the battery to be detected by using a helium source, after the helium pressing is completed, starting the jacking mechanism to drive the sealing covers to ascend to be separated from the supporting blocks, pushing the supporting blocks in close arrangement in sequence on the basis of the reference plate by the resetting mechanism, and moving the battery to be detected after the helium pressing to the helium detecting mechanism along with, (ii) a

step 2, leakage detection: moving the workpiece positioning mechanism and the to-be-detected leakage battery after helium pressing on the workpiece positioning mechanism is completed to the lower part of the leakage detection mechanism, at the moment, pushing the supporting blocks by the reset mechanism to be sequentially and closely arranged by taking the reference plate as a reference, starting a first jacking mechanism next to the reference plate in the leakage detection mechanism, driving a first sealing cover next to the reference plate to descend, penetrating through a through hole of the first supporting block next to the reference plate, then butting the first to-be-detected leakage battery next to the reference plate, sequentially jacking and butting the rest sealing covers one by one, and starting a vacuumizing device to respectively vacuumize the detection sealing covers; testing whether helium molecules leaked from the product exist in the sealing cavity through a helium mass spectrometer leakage detector;

Step 3, result analysis: if the helium mass spectrometer leak detector does not detect helium molecules in the step 2, the upper end of the battery shell to be subjected to leak detection is completely welded at the point to be subjected to leak detection, and the sealing is qualified and can be used for lithium battery production; and if the helium mass spectrometer leak detector detects that the helium molecules exceed the set alarm value in the step 2, indicating that the upper end of the battery shell to be detected leaks at the detected position. In the helium pressing process in the step 1, helium enters the battery cavity from the sealed cavity through a hole with a leak in the battery, and in the helium detecting process in the step 2, helium molecules in the battery shell enter the sealed cavity from the battery shell through the hole with the leak in the battery and are detected by a helium mass spectrum leakage detector.

Specifically, the jacking mechanism comprises a jacking cylinder and a guide block, the guide block is arranged between the jacking cylinder and the support block and is driven by the jacking cylinder to be vertically close to or far away from the support block, a guide groove is formed in the lower portion of the guide block, a connecting block matched with the guide groove is arranged on the upper portion of the sealing cover, and the sealing cover is installed in the guide groove through the connecting block and can horizontally move between the reference plate and the installation plate along the guide groove; when the battery installed in the workpiece positioning mechanism has an error in size or cannot be completely vertically butted with the sealing cover due to the fact that the battery is not loaded in a standard manner, because one supporting block is based on the former supporting block, the self error of a single battery and the assembly error between two adjacent batteries are within the sealing containing range of the sealing cover, the sealing cover can normally realize butt sealing with the corresponding battery, the butted sealing cover is subjected to jacking force and is matched and guided with the edge of the corresponding battery to drive the supporting block to deviate from the reference line, the deviation error corresponds to the assembly error of the battery, therefore, the position of the former supporting block after butt joint is used as a reference for the butt joint of the sealing cover, and the self error of the butted battery and the assembly error between the two adjacent batteries can be adapted to each butt joint of the sealing cover and the battery without being influenced by the accumulated values of the self error of all the batteries and the assembly error.

the through hole axially penetrating through the sealing cover is arranged in the sealing cover, the sealing ring is arranged between the top of the connecting block of the sealing cover and the groove wall of the guide groove, a channel extending from the guide groove to the side part of the guide block is arranged in the guide block, the jacking mechanism drives the sealing cover to be in butt joint with the battery, and meanwhile, the sealing ring is compressed between the guide groove and the guide block, so that the through hole in the sealing cover is in butt joint with the channel in the guide block to form a communicated channel. And at the station of the helium pressing step 1, connecting the connectors of the vacuumizing system and the helium pressing system with the channel openings at the side parts of the guide blocks, and vacuumizing and pressing helium for the battery to be subjected to leak detection through the helium pressing channel. And (3) connecting the connectors of the vacuumizing system and the helium mass spectrometer leak detection system with the channel openings on the side part of the guide block at the station of the leak detection step 2, and vacuumizing and detecting the battery to be subjected to leak detection through the detection channel.

Preferably, the resetting mechanism comprises a top rod, a supporting sleeve and a spring, the mounting plate is provided with a through hole corresponding to the position of the supporting block, the top rod penetrates through the through hole and is contacted with the supporting block close to the mounting plate, the spring sleeve is in threaded connection with the through hole on the mounting plate and is in movable fit with the top rod, the end wall of one end, contacted with the supporting block, of the top rod extends outwards in the radial direction to form a top block, the spring is arranged between the spring sleeve and the top block, and the elastic force of the spring pushes the top rod in an initial state, so that a plurality of supporting blocks on the guide rod are limited between the ejector rod and the reference plate, when the sealing cover descends and is in butt joint with a battery with assembly deviation, the battery edge is positioned with the sealing cover under the pressure of the jacking mechanism, the sealing cover drives the supporting block to adaptively move to the position corresponding to the battery to be detected, when the sealing cover is completely lifted to be separated from the supporting block, the elastic force of the spring pushes the ejector rod to return the supporting block to the initial state.

preferably, a sliding rail is arranged between the helium pressing mechanism and the helium detecting mechanism, and the workpiece positioning mechanism is slidably mounted on the sliding rail and can reciprocate between the helium pressing mechanism and the helium detecting mechanism through the sliding rail.

The invention has the beneficial effects that:

the invention provides a sealing butt joint mechanism for a battery batch group type helium pressing vacuum box method helium leakage detection device, which solves the problem that a sealing cover is difficult to butt joint with a battery due to product self errors and group assembly errors during battery batch group type helium pressing and leakage detection.

Drawings

FIG. 1 is a front view of a sealing and butting mechanism for battery batch pack type pressure helium vacuum box method leak detection provided by the invention;

FIG. 2 is a schematic illustration of a pressurized helium or leak detection installation of an embodiment;

FIG. 3 is an enlarged sectional view taken at A in FIG. 2;

FIG. 4 is a schematic view of the sealing cap and the battery in FIG. 2;

FIG. 5 is a side view of the guide block in connection with the seal housing;

FIG. 6 is a schematic view of a reset mechanism;

the device comprises a base plate 1, a mounting plate 2, a guide rod 3, a workpiece positioning mechanism 4, a supporting block 5, a reset mechanism 6, a jacking rod 61, a supporting sleeve 62, a spring 63, a jacking block 64, a jacking mechanism 7, a jacking cylinder 71, a guide block 72, a sealing cover 8, a connecting block 81, a sealing ring 9, a positioning spigot 10 and a leakage battery to be detected 11.

Detailed Description

the present invention will be described in further detail with reference to the accompanying drawings.