CN219590483U

CN219590483U - Test fixture and test equipment

Info

Publication number: CN219590483U
Application number: CN202321254522.5U
Authority: CN
Inventors: 吴凯; 陈有军; 徐冉
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-05-23
Filing date: 2023-05-23
Publication date: 2023-08-25
Anticipated expiration: 2033-05-23

Abstract

The application provides a test fixture and test equipment, the test fixture includes: the loading assembly comprises a loading table and a detection piece, the detection piece is arranged on the loading table, two sides of the loading table in the first direction are respectively a first side and a second side, the detection piece comprises a supporting portion which is arranged on the first side and can conduct electricity, the compression assembly comprises a driving piece and a compression piece, the compression piece is arranged on the first side, and the driving piece is connected with the compression piece and at least used for driving the compression piece to move from the first side to the second side. When the testing jig is used for detecting the cover plate component of the battery cell, the testing jig can be used for predicting in time before the battery cell is produced, and whether the insulation failure of the electrode post and the cover plate is caused after the electrode lug and the electrode post are welded or not can be judged, so that the production yield of the battery cell is improved.

Description

Test fixture and test equipment

Technical Field

The application relates to the technical field of testing, in particular to a testing jig and testing equipment.

Background

The battery cell generally includes a housing including a cover plate and a pole disposed on the cover plate, the pole and the cover plate being made of conductive material and being connected through an insulating member, and an electrode assembly disposed in the housing and including a tab electrically connected to the pole. However, after the tabs and the posts of some battery cells are welded, the posts and the cover plate are easy to form a short circuit, and the resistance performance requirements of the battery cells cannot be met.

Disclosure of Invention

The embodiment of the utility model provides a test fixture and test equipment, which can be used for effectively predicting whether the insulation failure problem of a pole and a cover plate occurs after the welding of the pole lug and the pole, and is beneficial to improving the production yield of a battery monomer.

In a first aspect, an embodiment of the present utility model provides a test fixture, including: the loading assembly comprises a loading table and a detection piece, the detection piece is arranged on the loading table, two sides of the loading table in the first direction are respectively a first side and a second side, the detection piece comprises a supporting portion which is arranged on the first side and can conduct electricity, the compression assembly comprises a driving piece and a compression piece, the compression piece is arranged on the first side, and the driving piece is connected with the compression piece and at least used for driving the compression piece to move from the first side to the second side.

When the test fixture is used for testing a piece to be tested (the test piece to be tested comprises a first conductive part and a second conductive part which are connected through insulation parts), the test piece to be tested is arranged on the first side of the loading table, the supporting part is positioned on one side of the test piece to be tested, which is close to the loading table, the shaft end of the supporting part supports the first conductive part of the test piece to be tested, and the pressing part applies acting force from the first side to the second side to the test piece to be tested, so that the first conductive part presses the supporting part, and the first conductive part and the supporting part can be in good contact electrical connection. During detection, the second conductive part and the supporting part of the test piece to be detected are discharged at the same time, and the supporting part is electrically connected with the first conductive part, so that the second conductive part and the first conductive part are discharged at the same time, whether the second conductive part and the first conductive part still keep an insulating state at the moment can be detected, and if the second conductive part and the first conductive part do not keep the insulating state, the fact that a conductive piece electrically connected with the second conductive part exists near the supporting part is indicated, and the conductive piece contacts with the supporting part to cause short circuit and insulation failure of the second conductive part and the first conductive part. According to the principle, when the testing jig is used for detecting the cover plate component of the battery cell, the testing jig can timely detect whether the conductive parts such as the metal wires electrically connected with the cover plate exist near the pole, so as to predict whether the insulation failure problem of the pole and the cover plate can be caused after the welding of the pole lug and the pole post, and the production yield of the battery cell is improved.

In some embodiments, the test fixture is adapted to detect a cover plate assembly, the cover plate assembly comprising: the cover plate is provided with a mounting hole, the pole corresponds to the mounting hole and is in insulating connection with the cover plate through the insulating piece, the insulating piece comprises an annular portion arranged in the mounting hole, the pole is located on the outer side of the annular portion to define a containing groove with the annular portion, and the end portion of the supporting portion is suitable for extending into the containing groove and supporting the pole.

According to the technical scheme, the supporting part of the test jig can be used for simulating the fact that the lug extends into the accommodating groove and is in contact electrical connection with the pole, when the metal wire formed by the cover plate in the structure of processing the mounting hole or the groove near the mounting hole and the like overflows from the annular part, the metal wire is easy to contact the supporting part and is in electrical connection with the supporting part, so that the test jig can be used for reliably detecting whether the metal wire connected with the cover plate exists near the pole or not, and the like, so that the problem that insulation failure between the cover plate and the pole is caused by the electrical connection of the metal wire and the lug when a battery monomer is manufactured is avoided as much as possible, and the production yield of the battery monomer is improved.

In some embodiments, the end of the support portion is contoured to the receiving groove, the support portion is clearance fit or interference fit with the annular portion, and the edge of the end of the support portion distal from the side end surface of the loading table is formed as a chamfered edge.

In the technical scheme, the end part of the supporting part is arranged to be in profiling with the accommodating groove, namely, the shape of the end part of the supporting part is matched with the shape of the accommodating groove, so that the fit clearance between the supporting part and the accommodating groove can be reduced, the supporting part and the annular part are in clearance fit or interference fit, at the moment, the distance between the supporting part and the cover plate can be effectively shortened, and therefore, when wires formed by processing the mounting holes or grooves and other structures near the mounting holes overflow from the annular part, the cover plate is easier to contact with the supporting part and be electrically connected with the supporting part, and the test fixture can more reliably detect whether the wires connected with the cover plate exist near the pole. Moreover, because the supporting part and the annular part are in clearance fit or interference fit, the edge of one end of the supporting part far away from the loading table is processed into the chamfer edge, so that the supporting part can smoothly extend into the accommodating groove.

In some embodiments, two detecting pieces are arranged on the loading table at intervals, and the two detecting pieces are used for respectively supporting the positive pole post and the negative pole post on the cover plate.

In the technical scheme, whether the metal wires connected with the cover plate and the like exist around the polar posts of the anode and around the polar posts of the cathode or not can be tested through the two detection pieces, so that the testing efficiency is improved.

In some embodiments, the loading platform is provided with a through hole communicated with the first side and the second side, the detection piece is penetrated through the through hole, and a part of the detection piece positioned on the second side of the loading platform is provided with a power receiving area electrically connected with the supporting part.

In the above technical scheme, through wearing to locate the perforation installation with detecting piece, can improve the reliability of detecting piece installation in loading table to, through setting up the electric district that connects on the part that is located the second side of loading table of detecting piece, make the electric district keep away from the supporting part setting, have sufficient space to walk the line, be convenient for connect electric district to connect detection circuit and test.

In some embodiments, the sensing element is cylindrical and is entirely of conductive material.

In the technical scheme, the columnar detection piece is convenient to penetrate and mount with the loading table, the detection piece is integrally arranged into a conductive column form, and the supporting part can be reliably electrically conducted with the power connection area, so that the detection piece is simple in structure and convenient to process, and the production cost can be reduced.

In some embodiments, the sensing element is movable in a first direction relative to the loading table, and the loading assembly further includes an elastic element disposed between the sensing element and the loading table and applying an elastic force to the sensing element in a direction from the second side to the first side.

In the technical scheme, when the pressing piece applies force to the test piece to be tested, if the supporting part is a hard support, the too large force application is easy to damage the test piece to be tested, and the too small force application cannot achieve the effect of pressing. And when the elastic piece is compressed, the force is not too small, and the test piece to be tested is pressed on the detection piece by the pressing piece, so that the reliability of the test can be improved.

In some embodiments, the loading platform is provided with a through hole communicated with the first side and the second side, and the detection piece penetrates through the through hole and is in sliding fit with at least part of the hole wall of the through hole so as to be movable along the axial direction of the through hole.

In the technical scheme, the assembly difficulty of the detection piece and the loading table can be reduced, the movement of the detection piece can be guided by utilizing the through holes on the loading table, the structure can be simplified, and the cost is reduced.

In some embodiments, the elastic member is a spring and is sleeved outside the detecting member and is matched in the through hole, and two axial ends of the spring are respectively abutted against the detecting member and the loading table.

In the technical scheme, the elastic piece is arranged to be the spring and sleeved outside the detection piece, and meanwhile, the spring is arranged in the through hole, so that the radial deformation of the spring can be limited by the detection piece and the through hole, the bending deformation of the spring in the direction deviating from the central line of the spring when the spring is compressed is improved, and the supporting reliability of the spring to the detection piece is improved. Moreover, as the two axial ends of the spring are respectively stopped against the detection piece and the loading table, the number of component parts can be reduced, the cost is reduced, and the assembly efficiency is improved.

In some embodiments, the perforation includes a first hole section and a second hole section which are sequentially arranged along a direction from the second side to the first side and have sequentially increased apertures, so as to form a first step surface at a joint of the first hole section and the second hole section, the detection member includes a first shaft section and a second shaft section which are sequentially arranged along a direction from the second side to the first side and have sequentially increased shaft diameters, so as to form a second step surface at a joint of the first shaft section and the second shaft section, the first shaft section is arranged in the first hole section and the second hole section in a penetrating manner, the elastic member is sleeved outside the first shaft section and is arranged in the second hole section in a penetrating manner, and two axial ends of the elastic member respectively abut against the first step surface and the second step surface.

In the technical scheme, the loading table and the detection piece are simple in structure, convenient to process and assemble, quick assembly of the elastic piece is facilitated, and the supporting reliability of the elastic piece to the detection piece is improved.

In some embodiments, the loading platform comprises a platform base body and an insertion part inserted in the platform base body, the insertion part is located on one side, far away from the first hole section, of the second hole section, the perforation comprises a third hole section penetrating through the insertion part, the second hole section penetrates through and is in sliding fit with the third hole section, a protruding part protruding in the radial direction is arranged at the end, close to the first shaft section, of the second hole section, one end, far away from the first side, of the insertion part is a limiting structure, and the limiting structure is stopped on one side, close to the first side, of the protruding part.

In the above technical scheme, the plug-in fitting can be used for guiding the movement of the detection piece, and the stop effect of the plug-in fitting on the protruding part can be utilized for limiting the limit position of the detection piece moving from the second side to the first side so as to prevent the detection piece from falling off from the loading table along the direction from the second side to the first side. In addition, during assembly, the detection member can be inserted into the platform base body first, and then the insertion member is inserted between the platform base body and the detection member along the direction from the first side to the second side, so that smooth assembly can be realized.

In some embodiments, the loading station includes a limit structure that limits the limit position of the detection member in a direction from the second side to the first side.

In the above technical solution, reliable mounting of the detecting member to the loading table can be realized, preventing the detecting member from coming out from the loading table in a direction from the second side to the first side.

In some embodiments, the loading assembly further includes a positioning member disposed on the first side of the loading platform, the positioning member is in a ring structure or a plurality of positioning members disposed at intervals so as to surround the placement area, and the detecting member is disposed in the placement area.

In the technical scheme, the test area of the test piece to be tested can be aligned to the supporting part by arranging the test piece to be tested in the placement area, so that the loading efficiency during test is improved, the position of the test piece to be tested is limited by the positioning piece, the position stability of the test piece to be tested during test can be improved, and the test effect is improved.

In some embodiments, the positioning member is provided with a guide wheel for guiding the member to be detected into and out of the placement area.

In the technical scheme, the loading or unloading efficiency of the test piece to be tested can be improved, the test piece to be tested can be protected to a certain extent, and the scratch problem is improved.

In some embodiments, the positioning member has a stop protruding therefrom, the stop protruding to a side of the guide wheel adjacent to the placement area, the stop being located on a side of the center plane of the guide wheel adjacent to the loading station in the first direction.

In the technical scheme, the stop table can be utilized to play a role of stopping the test piece to be tested, and the test piece to be tested is prevented from excessively moving the dynamic damage detection piece towards the direction close to the loading table, so that the effect of protecting the detection piece is achieved.

In some embodiments, the driving member includes a driving cylinder for driving the pressing member to reciprocate in the first direction.

In the technical scheme, the driving piece is simple in structure, not only can drive the compressing piece to reciprocate, but also can improve the control precision of the motion of the compressing piece.

In some embodiments, the pressing member includes a pressing head and a pressing needle mounted on the pressing head, the pressing needle being exposed on a side of the pressing head near the loading table, the pressing needle being disposed around the detecting member in a plurality and spaced apart manner.

In the technical scheme, the force is applied to the test piece to be tested through the plurality of pressing pins, so that the dispersion of the force can be improved, the test area of the test piece to be tested can be in good contact with the supporting part from multiple angles, and the reliability and the effectiveness of the electric connection between the test area and the supporting part are improved.

In some embodiments, the presser finger is floatable relative to the presser head in a first direction.

In the technical scheme, the pressing needle can be used as buffer, so that the problem that the test piece or the detection piece to be tested is damaged due to overlarge force application of the pressing head is avoided.

In some embodiments, the pressing member includes a pressing pin staggered with the detecting member, and the pressing pin is made of a conductive material.

In the above technical scheme, the pressing pin can be electrically connected with the second conductive part, for example, the cover plate, during testing, one connecting end of the detection circuit can be electrically connected with the grounding area of the detection piece, discharging the support part is equivalent to discharging the pole, the other connecting end of the detection circuit is electrically connected with the pressing pin of the pressing piece, discharging the pressing pin is equivalent to discharging the cover plate, and if the wire is lapped with the support part near the mounting hole, a short circuit is formed, so that whether the wire lapped with the support part is present near the mounting hole or not can be analyzed according to the testing result of the detection circuit, the cover plate discharging can be simply and effectively realized through the pressing pin, and the structure and the testing operation are simplified.

In some embodiments, the loading platform is provided with a plurality of detecting members, and the compressing assembly comprises a plurality of compressing members, and the plurality of compressing members are respectively and correspondingly arranged with the plurality of detecting members.

In the technical scheme, each detection piece is correspondingly provided with an independent pressing piece, so that the electric connection stability of each detection piece and a corresponding test area can be improved by utilizing the corresponding pressing piece, and the test effectiveness of each detection piece is improved.

In a second aspect, an embodiment of the present application further provides a test apparatus, including: the driving system comprises a driving rail and a driving assembly, and the driving assembly drives the loading assembly to move along the driving rail relative to the pressing assembly.

In the technical scheme, when testing, the driving component can drive the loading component to move out of the working position of the pressing component, so that the test piece to be tested is conveniently loaded on the loading component in a mechanical automation mode, and then the driving component can drive the loading component to move to the working position of the pressing component, so that the pressing component can press the test piece to be tested, the test fixture can perform reliable test, and after the test, the driving component can drive the loading component to move out of the working position of the pressing component again, so that the test piece to be tested is conveniently taken away from the loading component in a mechanical automation mode. Therefore, according to the test equipment provided by the embodiment of the application, the driving system capable of driving the loading assembly to move relative to the pressing assembly is arranged, so that automatic test is conveniently realized, the test efficiency is improved, and the labor is saved.

In some embodiments, the test apparatus includes a plurality of test jigs, and the loading assemblies of the plurality of test jigs are respectively driven by different driving assemblies and move along the same driving rail.

In the technical scheme, the plurality of test jigs can be utilized for testing simultaneously, the test efficiency and the beat are improved, and the loading assemblies of the plurality of test jigs are arranged to move along the same driving rail, so that the equipment can be simplified, the cost is reduced, and the occupied space of the test equipment is saved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of a test apparatus provided in some embodiments of the application;

fig. 2 is a partial enlarged view of the a portion shown in fig. 1;

FIG. 3 is a perspective view of a loader assembly provided in some embodiments of the present application;

FIG. 4 is a cross-sectional view of a loader assembly and a cover plate assembly provided in some embodiments of the application;

Fig. 5 is a partial enlarged view of the B portion shown in fig. 4;

fig. 6 is a partial enlarged view of the portion C shown in fig. 5;

fig. 7 is a partial enlarged view of the portion D shown in fig. 6.

Reference numerals: test equipment 1000; a test fixture 100; loading the assembly 1; a loading table 11; a first side 1101; a second side 1102; perforation 1103; a stage base 111; a mounting member 112; a first bore section 1121; a second bore section 1122; a first step surface 1123; a plug-in fitting 113; a limit structure 1131; a third bore section 1132; a detecting member 12; a support portion 121; chamfering edge 1211; a power-on region 122; a first shaft section 123; a second shaft section 124; a projection 1241; a second step surface 125; an elastic member 13; a positioning member 14; a stopper table 141; a guide wheel 15; a central plane S of the guide wheel; a placement area Z; a pressing assembly 2; a driving member 21; a mounting plate 211; a drive cylinder 212; a pressing member 22; a pressing head 221; a pressing needle 222; a drive system 200; a drive rail 3; a drive assembly 4; a cover plate assembly 300; a receiving groove 301; a cover plate 5; a mounting hole 51; a groove 52; a pole 6; an insulating member 7; an annular portion 70; a first insulating member 71; a first extension 711; a second insulator 72; a second extension 721; a third insulator 73; a test piece 01 to be tested; a first conductive portion 011; a second conductive part 012; an insulating part 013; a first direction X; a second direction Y; and a third direction Z.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, batteries play an important role as a power source of the electric automobiles. The battery is used as a core part of the new energy automobile, and has high requirements on the reliability of the battery.

A battery refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module, a battery pack, or the like. The battery module generally includes a plurality of battery cells. The battery pack generally includes a case for enclosing one or more battery cells or one or more battery modules. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.

The battery cell includes a case, an electrode assembly, and an electrolyte, and the case is used to accommodate the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a separation film. The battery cell mainly relies on ions to move between the positive pole piece and the negative pole piece to operate. The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.

The positive electrode sheet may generally include a positive electrode current collector and a positive electrode active material layer directly or indirectly coated on the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protruding from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector without the positive electrode active material layer serving as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like.

The negative electrode tab may generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly coated on the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protruding from the negative electrode current collector with the coated negative electrode active material layer, the negative electrode current collector without the negative electrode active material layer serving as a negative electrode tab. The material of the negative electrode current collector may be copper, and the material of the negative electrode active material layer may be carbon, silicon, or the like.

In the related art, some battery cell cases include a case body and a cover plate assembly covering an opening of the case body, the cover plate assembly including: the cover plate is provided with a mounting hole, the cover plate is provided with a groove around the mounting hole, the pole corresponds to the mounting hole, the cover plate and the pole are made of conductive metal, the pole and the cover plate are connected through the insulating piece in an insulating mode, the part of the insulating piece is embedded in the groove, the insulating piece comprises an annular portion arranged in the mounting hole, the pole is located on the outer side of the annular portion and is welded with the pole, a containing groove is defined between the pole and the annular portion, and the part of the pole extends into the containing groove to be welded with the pole so as to form the electric connection between the pole and the pole.

When structures such as mounting holes and grooves on the processing cover plate are required to be repeatedly processed at the same position, metal wires are easy to generate due to certain tolerance of repeated processing, the generated metal wires are close to the mounting holes, parts of the metal wires are easy to overflow from an insulating part to be close to the containing grooves, after the parts of the pole lugs extend into the containing grooves to be welded with the pole lugs, the metal wires are easy to contact with the pole lugs to form electric connection, and the cover plate and the pole lugs are electrically connected through the metal wires and the pole lugs to cause short circuit. The resistance performance requirement of the battery monomer cannot be met, and the production yield of the battery monomer is affected.

Based on the above consideration, the application provides a testing jig, which is characterized in that a detection piece is arranged to generally simulate a lug to extend into a containing groove and is in contact electrical connection with a pole, when a metal wire machined on a cover plate overflows from an annular part of an insulating piece, the metal wire is easy to contact the detection piece and is in electrical connection with the detection piece, and whether a metal wire connected with the cover plate exists near the containing groove or not can be judged by detecting whether the cover plate is in electrical connection with the detection piece or not, so that whether the metal wire is in electrical connection with the lug or not during manufacturing of a battery monomer is judged in advance, and the problem of insulation failure between the cover plate and the pole is caused, thereby improving the production yield of the battery monomer.

Next, a test fixture 100 according to an embodiment of the present application is described with reference to the drawings.

As shown in fig. 1 to 3, the test fixture 100 includes: the loading assembly 1 and the compacting assembly 2, the loading assembly 1 comprises a loading table 11 and a detection piece 12, and the detection piece 12 is arranged on the loading table 11. Referring to fig. 4 and 5, the loading table 11 has a first side 1101 and a second side 1102 on two sides in the first direction X, and the detecting element 12 includes a supporting portion 121 disposed on the first side 1101, where the supporting portion 121 is electrically conductive. Returning to fig. 2, the hold-down assembly 2 includes a drive member 21 and a hold-down member 22, the hold-down member 22 being disposed on the first side 1101, the drive member 21 being coupled to the hold-down member 22 for at least driving movement of the hold-down member 22 from the first side 1101 toward the second side 1102.

For example, as shown in fig. 1-3, the first direction X is an up-down direction, the upper side of the loading platform 11 is the first side 1101, and the lower side is the second side 1102, and the driving member 21 is at least used to drive the pressing member 22 to move from top to bottom, so that the pressing member 22 moves toward the loading platform 11. However, the present application is not limited thereto, and for example, the driving member 21 may be used to drive the pressing member 22 to move in a reset direction (e.g., downward-upward) from the second side 1102 to the first side 1101, and for example, the driving member 21 may be used to drive the pressing member 22 to move in a second direction Y (e.g., a left-right direction) perpendicular to the first direction X.

Of course, the driving member 21 may not be capable of driving the pressing member 22 to perform the two movements, instead, other components or devices may be used, for example, an elastic reset member may be used to drive the pressing member 22 to reset from the second side 1102 to the first side 1101 (for example, from bottom to top), and for example, a driving device may be used to drive the driving member 21 to drive the pressing member 22 to move along the second direction Y (for example, the left-right direction) perpendicular to the first direction X.

Referring to fig. 2 to 6, a test piece 01 to be tested used by the test fixture 100 for testing may include a first conductive portion 011, a second conductive portion 012 and an insulating portion 013, the first conductive portion 011 and the second conductive portion 012 are connected by the insulating portion 013, a test area of the test piece 01 to be tested corresponds to the first conductive portion 011, an axial end of the supporting portion 121 (for example, an upper end of the supporting portion 121 shown in fig. 5) away from the loading table 11 is used for supporting the first conductive portion 011, and the pressing assembly 2 is used for applying a force to the test piece 01 to be tested in a direction toward the loading table 11. When the test fixture 100 is used for testing the test piece 01 to be tested, the test piece 01 to be tested is arranged on the first side 1101 of the loading table 11, the supporting portion 121 is located on one side, close to the loading table 11, of the test piece 01 to be tested, the shaft end of the supporting portion 121 supports the first conductive portion 011 of the test piece 01 to be tested, and the pressing piece 22 applies a force from the first side 1101 to the second side 1102 to the test piece 01 to be tested, so that the first conductive portion 011 presses the supporting portion 121, and the first conductive portion 011 and the supporting portion 121 can be in good contact electrical connection.

Specifically, the test piece 01 to be tested has the first conductive portion 011 and the second conductive portion 012 located around the first conductive portion 011, both the second conductive portion 012 and the first conductive portion 011 are conductive, and the second conductive portion 012 and the first conductive portion 011 are connected by the insulating portion 013, and at the time of detection, the second conductive portion 012 and the supporting portion 121 can be simultaneously discharged, and since the supporting portion 121 is electrically connected to the first conductive portion 011, it is equivalent to simultaneously discharging the second conductive portion 012 and the first conductive portion 011, and it is detected whether the second conductive portion 012 and the first conductive portion 011 are kept in the insulating state.

If it is detected that the second conductive part 012 and the first conductive part 011 are in the disconnected state, it is explained that a better insulating state can still be exhibited between the second conductive part 012 and the first conductive part 011 after the support part 121 is provided. If it is detected that the second conductive portion 012 and the first conductive portion 011 are electrically connected, it is explained that the first conductive portion 011 and the second conductive portion 012 are electrically connected through a conductive path after the support portion 121 is disposed, for example, a wire electrically connected to the second conductive portion 012 is present near the first conductive portion 011 (for example, the wire formed by the second conductive portion 012 during processing overflows from the insulating portion 013), so that the second conductive portion 012 is electrically connected to the support portion 121 through the wire, and further, the electrical connection between the first conductive portion 011 and the second conductive portion 012 is achieved, thereby explaining that a reliable insulating state cannot be presented between the second conductive portion 012 and the first conductive portion 011 after the support portion 121 is disposed.

Specifically, when the test piece 01 to be tested is applied, if an electrical connection member electrically connected to the first conductive portion 011 is provided at the first conductive portion 011, and there is a conductive member such as a wire electrically connected to the second conductive portion 012 in the vicinity of the first conductive portion 011, the conductive member is easily electrically connected to the electrical connection member, and insulation failure between the first conductive portion 011 and the second conductive portion 012 is caused. According to the test fixture 100 of the embodiment of the present application, it is possible to detect whether or not a conductive member such as a wire electrically connected to the second conductive portion 012 is present near the first conductive portion 011, so as to avoid the problem of insulation failure between the first conductive portion 011 and the second conductive portion 012 after the first conductive portion 011 is connected to the electrical connection member.

For example, referring to fig. 5 and 6, when the test piece 01 to be tested is the cover plate assembly 300, the cover plate assembly 300 includes a cover plate 5 and a pole 6 disposed on the cover plate 5, the cover plate 5 is a second conductive portion 012, the pole 6 is a first conductive portion 011, the pole 6 is disposed corresponding to the mounting hole 51 on the cover plate 5, the cover plate 5 and the pole 6 are connected in an insulating manner by an insulating member 7, and the insulating member 7 forms an insulating portion 013. When the mounting hole 51 is machined in the cover plate 5, or when the groove 52 is machined around the mounting hole 51, a metal wire is easily formed at the machined part by repeated stamping at one position, one end of the metal wire is connected with the cover plate 5, the other end of the metal wire bypasses the insulating piece 7 and extends to the vicinity of the pole 6, and when the pole lug is connected with the pole 6, the metal wire is easily electrically connected with the pole lug, so that the pole lug is electrically connected with the cover plate 5, and insulation failure between the cover plate 5 and the pole 6 is caused.

According to the test fixture 100 of the embodiment of the application, whether the metal wire connected with the cover plate 5 exists or not can be detected in time before the production of the battery cell, so that the problem that the insulation between the cover plate 5 and the electrode column 6 fails due to the electric connection between the metal wire and the electrode lug when the battery cell is manufactured can be avoided as much as possible, and the production yield of the battery cell can be improved.

In some embodiments of the present application, in conjunction with fig. 5 and 6, the test fixture 100 is adapted to detect a cover plate assembly 300, the cover plate assembly 300 comprising: the cover plate 5, the pole 6 and the insulating piece 7, the cover plate 5 and the pole 6 are all conductive material pieces, the cover plate 5 is provided with a mounting hole 51, the pole 6 is arranged corresponding to the mounting hole 51 and is in insulating connection with the cover plate 5 through the insulating piece 7, the insulating piece 7 comprises an annular portion 70 arranged in the mounting hole 51, the pole 6 is positioned on the outer side of the annular portion 70 to define a containing groove 301 with the annular portion 70, namely, an inner ring area of the annular portion 70 belongs to the containing groove 301, and the end portion of the supporting portion 121 is suitable for extending into the containing groove 301 and supporting the pole 6. It should be noted that, the "outer side" in this paragraph refers to the side of the cover assembly 300 facing the outside of the battery cell when the battery cell is applied.

It should be noted that, the insulating member 7 may be formed by only one component, or may be formed by a plurality of components, all components for insulating the cover plate 5 from the pole 6 together form the insulating member 7, the parts of the insulating member 7 extending into the mounting hole 51 together form the annular portion 70, and the annular portion 70 is disposed around the mounting hole 51 to realize insulation protection of the cover plate 5 at the mounting hole 51.

It will be appreciated that, when the cover plate assembly 300 is processed, in order to facilitate quick installation and reliable setting of the insulating member 7, the cover plate 5 is generally provided with the groove 52 around the position of the mounting hole 51, a part of the insulating member 7 may be embedded in the groove 52, when the groove 52 and the mounting hole 51 are processed, repeated processing may be required to be repeated at the same position for a plurality of times, and a certain tolerance exists, so that a metal wire is easy to be generated, the metal wire generated at the position is close to the mounting hole 51, a part of the metal wire is easy to overflow from the insulating member 7 and is close to the accommodating groove 301, and after the part of the tab extends into the accommodating groove 301 and is welded with the tab 6, the metal wire is close to the tab and is easy to form an electrical connection, so that the cover plate 5 is electrically connected with the tab 6 through the tab, and the yield of the production of the battery cell is affected.

Therefore, according to the test fixture 100 of the embodiment of the application, the supporting portion 121 can substantially simulate the protrusion of the tab into the accommodating groove 301 and is electrically connected with the post 6 in a contact manner, when the cover plate 5 overflows from the annular portion 70 in the processing of the mounting hole 51 or the metal wire formed by the groove 52 and other structures near the mounting hole 51, the supporting portion 121 is easily contacted and electrically connected with the supporting portion 121, so that the test fixture 100 of the application can reliably detect whether the metal wire connected with the cover plate 5 exists near the post 6 or not, and the problem that insulation failure between the cover plate 5 and the post 6 is caused by the electrical connection of the metal wire and the tab when manufacturing the battery cell is avoided as much as possible, and the production yield of the battery cell can be improved.

In some embodiments, referring to fig. 5-7, the end of the support portion 121 is contoured to the receiving groove 301, the support portion 121 is in a clearance fit or interference fit with the annular portion 70, and the edge of the end of the support portion 121, which is distal from the side end surface of the loading table 11 (e.g., the upper end surface of the support portion 121 shown in fig. 5), is formed as a chamfered edge 1211, which may be, for example, beveled or rounded.

The end of the supporting portion 121 is configured to be contoured with the accommodating groove 301, that is, the shape of the end of the supporting portion 121 is adapted to the shape of the accommodating groove 301, for example, the supporting portion is circular, elliptical, oblong, rectangular, or the like, so that a fit gap between the supporting portion 121 and the accommodating groove 301 can be reduced, and the supporting portion 121 and the annular portion 70 are in clearance fit or interference fit, at this time, a distance between the supporting portion 121 and the cover plate 5 can be effectively shortened, so that when a wire formed by processing the mounting hole 51 or a groove 52 near the mounting hole 51 or the like overflows from the annular portion 70, the cover plate 5 is easier to contact the supporting portion 121 and be electrically connected with the supporting portion 121, and the test fixture 100 of the present application can more reliably detect whether the wire or the like connected with the cover plate 5 near the pole 6. Moreover, since the supporting portion 121 and the annular portion 70 are in clearance fit or interference fit, the edge of the end, far away from the loading table 11, of the supporting portion 121 is machined into the chamfer edge 1211, so that the supporting portion 121 can smoothly extend into the accommodating groove 301, and the problem that the supporting portion 121 scratches the pole 6 can be solved.

The annular portion 70 may be made of elastic insulating materials such as rubber and silica gel, so that interference fit between the annular portion 70 and the supporting portion 121 is facilitated on the premise of ensuring the form of the annular portion 70. When the annular portion 70 is made of a material that is not easily deformed, for example, hard plastic, the supporting portion 121 may be disposed in clearance fit with the annular portion 70, so as to ensure that the supporting portion 121 can smoothly extend into the accommodating groove 301, and avoid the supporting portion 121 from affecting the shape of the annular portion 70.

For example, referring to fig. 5 to 7, the ring portion 70 may be circular and the inner ring may have a diameter of 14.95mm, the supporting portion 121 may be cylindrical and have a diameter of 14.95mm±0.01mm, the supporting portion 121 may be tightly fitted with the ring portion 70, and the supporting portion 121 may stand naturally after extending into the ring portion 70. The end edge of the support portion 121 is designed as a rounded corner having a radius of 1.2mm to perform a guiding function so that the support portion 121 can smoothly extend into the ring portion 70. Further, the radius of the chamfered edge 1211 is smaller than the axial height of the annular portion 70, so that the annular portion 70 can limit the non-chamfered peripheral wall surface of the support portion 121 (i.e., the range of the H region of the peripheral wall surface of the support portion 121 shown in fig. 7), enhancing the effectiveness of the test.

In some embodiments, the testing fixture 100 is suitable for testing two poles 6 of positive and negative electrodes on the cover plate 5 of the cover plate assembly 300, two testing pieces 12 are disposed on the loading table 11 at intervals, the two testing pieces 12 are used for respectively supporting the two poles 6 of positive and negative electrodes correspondingly, i.e. one testing piece 12 supports the pole 6 of positive electrode, and the other testing piece 12 supports the pole 6 of negative electrode. Therefore, whether wires connected with the cover plate 5 exist around the positive pole 6 and around the negative pole 6 or not can be tested through the two detection pieces 12, so that the testing efficiency is improved, and the stability of placing the cover plate assembly 300 on the detection pieces 12 can be improved through the two detection pieces 12 respectively supporting the two pole 6, so that other structural members supporting the cover plate assembly 300 can be omitted.

Of course, the application of the test fixture 100 of the present application is not limited to this, i.e. the test fixture 100 of the present application is not limited to be used for detecting the cover plate assembly 300 with the accommodating groove 301, for example, when the pole 6 extends into the annular portion 70 to be flush with the inner end surface of the annular portion 70 or extends inward beyond the inner end surface of the annular portion 70, the test fixture 100 of the present application may be used for testing, and the supporting portion 121 may be supported on the inner end surface of the pole 6. It should be noted that, the "inner side" in this paragraph refers to the side of the cover assembly 300 facing the inside of the battery cell when the battery cell is applied.

In some examples, the detecting member 12 includes a power receiving area 122 electrically connected to the supporting portion 121, and the pressing member 22 includes a pressing pin 222 staggered from the detecting member 12, where the pressing pin 222 is made of a conductive material. The pin 222 is offset from the detecting element 12, so that the pin 222 is suitable for abutting against the second conductive portion 012, for example, the cover 5, and the pin 222 is made of a conductive material, so that the pin 222 can be electrically connected with the second conductive portion 012, for example, the cover 5.

During testing, one connecting end of the detection circuit can be electrically connected to the electric connection area 122 of the detection member 12, discharging the supporting portion 121, which corresponds to discharging the pole column 6, the other connecting end of the detection circuit is electrically connected to the pressing needle 222, discharging the pressing needle 222, which corresponds to discharging the cover plate 5, and if the wire is lapped with the supporting portion 121 near the mounting hole 51, a short circuit is formed, so that whether the wire lapped with the supporting portion 121 near the mounting hole 51 is present or not can be analyzed according to the test result of the detection circuit, and discharging of the cover plate 5 can be simply and effectively realized, and the structure and the test operation are simplified.

The setting mode of the detection circuit is not limited, and for example, the detection circuit may be a detection circuit integrated in an electrical control system of the test fixture 100, that is, the test fixture 100 includes a detection circuit, two connection ends of the detection circuit are respectively electrically connected to the power-on region 122 and the pin 222, and the detection circuit is used for detecting whether a short circuit state or an insulation state is present between the two connection ends. Alternatively, the detection circuit may be an internal circuit of the detector, which is external to the test fixture 100 and performs detection by an external connection method. In addition, when the external detector is used for detection, the cover plate 5 is not limited to being discharged through the pressure pin 222, and for example, the direct discharge of the cover plate 5 can be realized through the direct contact between the detection pin of the detector and the cover plate 5. In addition, the detection circuit may be a high-voltage resistance detection circuit or the like in order to detect whether a short-circuit state or an insulating state is present between the second conductive portion 012 and the first conductive portion 011.

In some embodiments, as shown in fig. 3-5, the loading platform 11 has a through hole 1103 in communication with the first side 1101 and the second side 1102, and the detecting element 12 is disposed through the through hole 1103, and the power receiving area 122 is disposed on the second side 1102 of the loading platform 11. Therefore, the reliability of the mounting of the detecting member 12 on the loading platform 11 can be improved by penetrating the detecting member 12 through the penetrating hole 1103, and the power receiving area 122 is arranged on the part of the detecting member 12 located on the second side 1102 of the loading platform 11, so that the power receiving area 122 is far away from the supporting part 121, and enough space wiring is provided, so that the detecting circuit can be conveniently connected for testing.

Illustratively, the sensing element 12 is cylindrical and may be entirely of electrically conductive material. Therefore, the penetrating installation of the detection piece 12 and the perforation 1103 is convenient, the detection piece 12 made of the conductive material is simple in structure, convenient to process and capable of reducing cost. For example, a jack is formed on a portion of the detecting member 12 located on the second side 1102 of the loading table 11, the jack constitutes the power receiving area 122, electrical connection of the power receiving area 122 with the supporting portion 121 can be easily achieved, and the power receiving area 122 in the form of a jack facilitates connection with the connection terminal. The present application is not limited thereto, and the detecting member 12 may be made of a combination of a conductive material and a nonconductive material, so long as the conductive material is used at a portion where conductivity is required, and the present application is not limited thereto.

Of course, the present application is not limited thereto, and the power receiving area 122 may not be located at the second side 1102 of the loading table 11, for example, the power receiving area 122 may also be located at the first side 1101 of the loading table 11, spaced apart from the supporting portion 121, or built in the supporting portion 121, etc.

In some embodiments, the detecting member 12 is movable in the first direction X relative to the loading table 11, and the loading assembly 1 further comprises an elastic member 13, the elastic member 13 being disposed between the detecting member 12 and the loading table 11 and applying an elastic force to the detecting member 12 in a direction from the second side 1102 to the first side 1101.

Illustratively, as shown in fig. 5, the first side 1101 of the loading table 11 is an upper side of the loading table 11, the second side 1102 of the loading table 11 is a lower side of the loading table 11, the detecting member 12 is not fixedly mounted on the loading table 11, but is movably mounted on the loading table 11 in an up-down direction, the elastic member 13 is disposed between the detecting member 12 and the loading table 11 and is used for applying an upward elastic force to the detecting member 12, when the test piece 01 to be tested is placed on the supporting portion 121 of the detecting member 12, the pressing member 22 applies a downward pressing force (which may be a pressure or a tensile force) to the test piece 01 to be tested so as to press the test piece 01 to the supporting portion 121, and at this time, if the test piece 01 to be tested can push the detecting member 12 downward so that the elastic member 13 is compressed, it is indicated that the test piece 01 to be tested is pressed to the detecting member 12.

It should be noted that, when the pressing member 22 applies force to the test piece 01 to be tested, if the supporting portion 121 is a rigid support, the test piece 01 to be tested is easily damaged due to too large force application, and the effect of pressing cannot be achieved due to too small force application. Moreover, when the elastic member 13 is compressed, the force is not too small, and the test piece 01 to be tested is already pressed on the detecting member 12 by the pressing member 22, so that the reliability of the test can be improved.

In some embodiments, as shown in fig. 3-5, the loading platform 11 has a through hole 1103 in communication with the first side 1101 and the second side 1102, and the detecting member 12 is disposed through the through hole 1103 and slidably engaged with at least a portion of a wall of the through hole 1103 so as to be movable in an axial direction of the through hole 1103. Illustratively, the first side 1101 of the loading table 11 is an upper side of the loading table 11, the second side 1102 of the loading table 11 is a lower side of the loading table 11, the loading table 11 has a through hole 1103 penetrating in the up-down direction, and the detecting member 12 is penetrated through the through hole 1103 and is supported by the wall of the through hole 1103 to be movable in the up-down direction, so that the assembling difficulty of the detecting member 12 and the loading table 11 can be reduced, and the movement of the detecting member 12 can be guided by the through hole 1103 on the loading table 11, so that the structure can be simplified and the cost can be reduced.

In addition, when the detecting member 12 is disposed through the through hole 1103 and slidably engaged with at least a portion of the hole wall of the through hole 1103 so as to be movable along the axial direction of the through hole 1103, the power receiving area 122 may be disposed on a portion of the detecting member 12 located on the second side 1102 of the loading platform 11, so that the power receiving area 122 is disposed away from the supporting portion 121, and has enough space for routing, so as to be convenient for connecting with a detecting circuit for testing.

Of course, the present application is not limited to this, and for example, the detection pieces 12 may be all provided on the first side 1101 of the loading table 11, and the detection pieces 12 may be mounted on the loading table 11 by a guide device, so that the detection pieces 12 can be smoothly moved up and down.

In some embodiments, as shown in fig. 3-5, the loading station 11 includes a limit structure 1131, the limit structure 1131 limiting the limit position of movement of the detector 12 in a direction from the second side 1102 to the first side 1101. Thus, the detection piece 12 can be reliably mounted on the loading table 11, and the detection piece 12 is prevented from coming out of the loading table 11 in the direction from the second side 1102 to the first side 1101. It should be noted that, the present application is not limited thereto, and when the direction from the second side 1102 to the first side 1101 is the downward-upward direction, the detecting member 12 will not automatically separate from the loading table 11 from the downward direction due to the gravity, so the limiting structure 1131 may be omitted if necessary. The specific configuration of the limiting structure 1131 is not limited, and may be flexibly designed according to the manner of fitting the loading table 11 and the detecting member 12.

In some embodiments, as shown in fig. 5, the elastic member 13 is a spring, and is sleeved outside the detecting member 12 and fitted in the through hole 1103, and two axial ends of the spring respectively abut against the detecting member 12 and the loading table 11. Therefore, the elastic piece 13 is arranged as a spring and sleeved outside the detection piece 12, and meanwhile, the spring is arranged in the perforation 1103, so that the radial deformation of the spring can be limited by the detection piece 12 and the perforation 1103, the bending deformation of the spring in the direction deviating from the central line of the spring when the spring is compressed is improved, and the supporting reliability of the spring to the detection piece 12 is improved. Moreover, since the axial both ends of the spring are respectively stopped against the detecting member 12 and the loading table 11, the number of component parts can be reduced, the cost can be reduced, and the improvement of the assembly efficiency can be facilitated.

Illustratively, as shown in fig. 5, the perforation 1103 includes a first hole segment 1121 and a second hole segment 1122 that are sequentially disposed in a direction from the second side 1102 to the first side 1101 and sequentially increase in diameter to form a first stepped surface 1123 at a junction of the first hole segment 1121 and the second hole segment 1122, i.e., the first hole segment 1121 and the second hole segment 1122 are sequentially disposed in a direction from the second side 1102 to the first side 1101, the second hole segment 1122 has a larger diameter than the first hole segment 1121, and the perforation 1103 forms a first stepped surface 1123 at the junction of the first hole segment 1121 and the second hole segment 1122. The detecting element 12 includes a first shaft section 123 and a second shaft section 124 that are sequentially disposed along a direction from the second side 1102 to the first side 1101 and have sequentially increased shaft diameters to form a second step surface 125 at a junction of the first shaft section 123 and the second shaft section 124, that is, the first shaft section 123 and the second shaft section 124 are sequentially disposed along a direction from the second side 1102 to the first side 1101, a diameter of the first shaft section 123 is smaller than a diameter of the second shaft section 124, and the detecting element 12 forms the second step surface 125 at a junction of the first shaft section 123 and the second shaft section 124.

The first shaft section 123 is disposed through the first hole section 1121 and the second hole section 1122, the elastic member 13 is disposed around the first shaft section 123 and disposed through the second hole section 1122, and two axial ends of the elastic member 13 are respectively abutted against the first step surface 1123 and the second step surface 125. For example, when assembling, the elastic member 13 may be first sleeved on the first shaft section 123, and then the first shaft section 123 sequentially extends into the second hole section 1122 and the first hole section 1121 along the direction from the first side 1101 to the second side 1102, where the elastic member 13 may provide an elastic supporting force to the detecting member 12 along the direction from the second side 1102 to the first side 1101. Therefore, the loading table 11 and the detecting member 12 are simple in structure, convenient to process and assemble, and beneficial to rapid assembly of the elastic member 13.

Illustratively, as shown in fig. 5, the diameter of the second shaft section 124 is smaller than the diameter of the second hole section 1122, when the detecting member 12 is pushed from the first side 1101 to the second side 1102, the elastic member 13 may be pushed and compressed by the second step surface 125, and the second shaft section 124 may extend into the second hole section 1122, so that the axial length of the elastic member 13 is advantageously reduced, and the structure is compact.

Illustratively, as shown in FIG. 5, the loading station 11 may include a station base 111 and a mounting member 112, the mounting member 112 being disposed on a second side 1102 of the station base 111, and the first and second hole segments 1121, 1122 being disposed on the mounting member 112, such that the station base 111 and the mounting member 112 may be easily machined and then easily assembled together. In addition, in some embodiments, the detecting element 12 may be inserted through the table base 111, and then the mounting element 112 may be sleeved on the detecting element 12 along the direction from the second side 1102 to the first side 1101. However, the present application is not limited thereto, and in some other embodiments of the present application, the stage base 111 and the mount 112 may be provided as an integral piece.

In some embodiments, as shown in fig. 5, the loading platform 11 includes a platform base 111 and an insertion member 113 inserted in the platform base 111, the insertion member 113 is located on a side of the second hole section 1122 away from the first hole section 1121, the through hole 1103 includes a third hole section 1132 penetrating through the insertion member 113, the second shaft section 124 is penetrated through and slidingly engaged with the third hole section 1132, an end of the second shaft section 124 near the first shaft section 123 has a protruding portion 1241 protruding in a radial direction, an end of the insertion member 113 away from the first side 1101 is a limiting structure 1131, and the limiting structure 1131 is stopped on a side of the protruding portion 1241 near the first side 1101.

By providing the insertion member 113, the movement of the detecting member 12 can be guided, and the stopper of the insertion member 113 against the projection 1241 can restrict the movement of the detecting member 12 from the second side 1102 to the first side 1101 to the limit position, thereby preventing the detecting member 12 from coming out of the loading table 11 in the direction from the second side 1102 to the first side 1101. In addition, at the time of assembly, the detecting member 12 may be inserted into the stage base 111 first, and then the insertion member 113 may be inserted between the stage base 111 and the detecting member 12 in the direction from the first side 1101 to the second side 1102, so that smooth assembly may be achieved.

Illustratively, the projection 1241 may be an annular structure around the entire circumference of the second shaft section 124, or may be further configured to include a plurality of projections disposed at intervals along the circumference of the second shaft section 124 to enable a flexible design of the projection 1241.

In some embodiments, as shown in fig. 2 and 3, the loading assembly 1 further includes a positioning member 14, where the positioning member 14 is disposed on the first side 1101 of the loading platform 11, and the positioning member 14 is in a ring structure to surround the placement area Z, or the positioning member 14 is in a plurality of spaced-apart positioning members to surround the placement area Z, and the detecting member 12 is located in the placement area Z. Wherein the hatched area shown in fig. 3 illustrates the placement area Z.

Therefore, the test area of the test piece 01 to be tested can be aligned to the supporting part 121 by arranging the test piece 01 to be tested in the placement area Z, so that the loading efficiency during testing is improved, the position of the test piece 01 to be tested is limited by the positioning piece 14, the position stability of the test piece 01 to be tested during testing can be improved, and the testing effect is improved.

In some embodiments, the positioning member 14 is provided with a guiding wheel 15 for guiding the test piece 01 to be tested to enter and exit the placement area Z, so that loading or unloading efficiency of the test piece 01 to be tested can be improved, the test piece 01 to be tested can be protected to a certain extent, and scratch problem can be improved. For example, the first direction X is an up-down direction, the upper side of the loading table 11 is a first side 1101, the lower side of the loading table 11 is a second side 1102, the axial direction of the guide wheels 15 is perpendicular to the up-down direction, further, the axial directions of the guide wheels 15 located at the left and right sides of the placement area Z extend along a third direction Z (for example, a front-back direction) perpendicular to the first direction X, the axial directions of the guide wheels 15 located at the front and rear sides of the placement area Z extend along a second direction Y (for example, a left-right direction) perpendicular to both the first direction X and the third direction Z, so that the rolling surface of the guide wheels 15 can face the placement area Z, and the rolling surface of each guide wheel 15 can effectively guide the workpiece 01 to be tested to enter and exit the placement area Z.

In some embodiments, referring to fig. 3 to 5, the positioning member 14 has a stop table 141 protruding therefrom, the stop table 141 protruding to a side of the guide wheel 15 near the placement area Z, the stop table 141 being located on a side of the center plane S of the guide wheel 15 near the loading table 11 in the first direction X. Wherein, "the center plane S of the guide wheel 15" means: the stop table 141 is lower than the central plane of the guide wheel 15, passing through the centre of the guide wheel 15 and parallel to the face of the loading table 11, for example when the first side 1101 of the loading table 11 is the upper side of the loading table 11 and the second side 1102 of the loading table 11 is the lower side of the loading table 11. Therefore, the stop table 141 can be utilized to stop the test piece 01 to be tested, so that the test piece 01 to be tested is prevented from excessively moving the compression-damage detection piece 12 towards the direction close to the loading table 11, and the effect of protecting the detection piece 12 is achieved.

Illustratively, with reference to fig. 2-5, when the number of sensing elements 12 is plural, the plurality of sensing elements 12 are each located within the placement zone Z. For example, referring to fig. 2 and 3, two detecting elements 12 are disposed on the loading table 11 at a left-right interval, one positioning element 14 is disposed on the left side of the detecting element 12 on the left side, one positioning element 14 is disposed on the right side of the detecting element 12 on the right side, one positioning element 14 is disposed on each of the front side and the rear side of the detecting element 12 on the left side, and one positioning element 14 is disposed on each of the front side and the rear side of the detecting element 12 on the right side, so that a placement area Z can be defined by the six positioning elements 14, and two detecting elements 12 disposed at intervals are disposed in the placement area Z, thereby, when the testing jig 100 is used for simultaneously testing whether or not wires are present around the two poles 6 of the cover assembly 300, the six positioning elements 14 can perform position limiting on the cover assembly 300 without affecting the placement of the cover assembly 300 onto the loading table 11.

In some embodiments of the present application, the pressing member 22 includes a pressing head 221 and a pressing needle 222 mounted on the pressing head 221, the pressing needle 222 is exposed on a side of the pressing head 221 near the loading table 11, and the pressing needles 222 are disposed around the detecting member 12 in a plurality and spaced apart manner. Thus, the plurality of pressing pins 222 apply force to the test piece 01 to be tested, so that the dispersion of the force application can be improved, the test area of the test piece 01 to be tested can be well contacted with the supporting part 121 from multiple angles, and the reliability and the effectiveness of the electric connection between the test area and the supporting part 121 are improved. In this embodiment, the pressing needle 222 may be made of conductive material, so as to be used for discharging the cover plate 5 and the like. Alternatively, the pins 222 may be made of a non-conductive material to discharge the cover 5 in other manners.

It should be noted that the function of the compressing assembly 2 is to compress the test piece 01 to be tested on the supporting portion 121, but the direction of the force applied by the compressing element 22 is not limited to the direction of applying the pressure from the side of the test piece 01 to be tested away from the loading table 11, so as to achieve the compression, for example, in other embodiments, the compressing element 22 applies the tensile force from the side of the test piece 01 to be tested close to the loading table 11 by using magnetic attraction or the like.

In some embodiments, the presser pin 222 is floatable relative to the presser head 221 in the first direction X. Thus, the pressing needle 222 can be used as a buffer to avoid the problem that the test piece 01 or the detecting piece 12 to be detected is damaged due to the excessive force applied by the pressing head 221. In this embodiment, the pressing needle 222 may be made of conductive material, so as to be used for discharging the cover plate 5 and the like. Alternatively, the pins 222 may be made of a non-conductive material to discharge the cover 5 in other manners.

In some embodiments, as shown in fig. 2, the driving member 21 includes a driving cylinder 212, and the driving cylinder 212 is configured to drive the compressing member 22 to reciprocate in the first direction X. The type of the driving cylinder 212 is not limited, and may be, for example, an air cylinder, a hydraulic cylinder, or the like. For example, the driving member 21 may include a mounting plate 211 and a driving cylinder 212, the pressing member 22 includes a pressing head 221 and a pressing needle 222, the pressing head 221 is mounted on the mounting plate 211, and the driving cylinder 212 drives the mounting plate 211 to move the pressing head 221 up and down.

Therefore, after the test is finished, the driving cylinder 212 can drive the compressing element 22 to lift, and release the acting force on the test piece 01 to be tested, so that the test piece 01 to be tested can be taken down and unloaded, the driving element 21 is simple in structure, the compressing element 22 can be driven to reciprocate, and the control precision of the motion of the compressing element 22 can be improved. Alternatively, in other embodiments, a rack and pinion, worm and gear mechanism, or the like, may be selected in place of the drive cylinder to drive the compression member 22 to reciprocate in the first direction X. In addition, the return movement of the hold-down member 22 from the second side 1102 to the first side 1101 is not limited to being driven by the drive cylinder 212, but may be driven by an elastic return member in other embodiments, for example, without limitation.

In some embodiments, as shown in fig. 2 and 3, the loading table 11 is provided with a plurality of detecting members 12, and the pressing assembly 2 includes a plurality of pressing members 22, where the plurality of pressing members 22 are respectively disposed corresponding to the plurality of detecting members 12. That is, each detecting member 12 is correspondingly provided with an independent pressing member 22, so that the corresponding pressing member 22 can be utilized to improve the electrical connection stability between each detecting member 12 and the corresponding testing area, and improve the testing effectiveness of each detecting member 12.

For example, in the example shown in fig. 2 and 3, two detecting members 12 are disposed on the loading table 11 at left and right intervals, the pressing assembly 2 includes two pressing members 22 disposed at left and right intervals, the two pressing members 22 are disposed corresponding to the two detecting members 12, respectively, one detecting member 12 is used for electrically contacting the positive pole 6, and the other detecting member 12 is used for electrically contacting the negative pole 6, so that the reliability of the electrically contacting the two detecting members 12 corresponding to the two poles 6, respectively, can be improved.

It should be noted that, when the number of the pressing members 22 is plural, the driving member 21 may be one and simultaneously drive the plural pressing members 22, or the driving member 21 may be plural and individually drive the plural pressing members 22, so that flexible design can be achieved.

The present application also proposes a test apparatus 1000, as shown in fig. 1, the test apparatus 1000 comprising: drive system 200 and test fixture 100 according to any embodiment of the present application, drive system 200 includes drive rail 3 and drive assembly 4, drive assembly 4 driving loading assembly 1 to move along drive rail 3 relative to compression assembly 2. During testing, the driving component 4 can drive the loading component 1 to move out of the working position of the pressing component 2, so that the test piece 01 to be tested can be conveniently loaded on the loading component 1 in a mechanical automation mode, then the driving component 4 can drive the loading component 1 to move to the working position of the pressing component 2, so that the pressing component 2 can press the test piece 01 to be tested, the test fixture 100 can perform reliable testing, and after testing, the driving component 4 can drive the loading component 1 to move out of the working position of the pressing component 2 again, so that the test piece 01 to be tested can be conveniently taken away from the loading component 1 in a mechanical automation mode. Therefore, according to the test equipment 1000 of the embodiment of the application, the driving system 200 capable of driving the loading assembly 1 to move relative to the pressing assembly 2 is arranged, so that automatic test is conveniently realized, the test efficiency is improved, and the labor is saved.

In some embodiments of the present application, as shown in fig. 1, the test apparatus 1000 may include a plurality of test jigs 100, and the loading assemblies 1 of the plurality of test jigs 100 are driven by different driving assemblies 4 and move along the same driving rail 3, respectively. Therefore, the plurality of test jigs 100 can be used for testing at the same time, the test efficiency and the beat are improved, and the loading assembly 1 of the plurality of test jigs 100 is arranged to move along the same driving rail 3, so that the equipment can be simplified, the cost can be reduced, and the occupied space of the test equipment 1000 can be saved.

Next, the test fixture 100 according to one embodiment of the present application is described as applied to the test of the cover plate assembly 300.

Referring to fig. 1 to 6, the cap plate assembly 300 includes: the cover plate 5, the pole 6 and the insulating piece 7 are provided with mounting holes 51, the pole 6 is arranged corresponding to the mounting holes 51 and is in insulating connection with the cover plate 5 through the insulating piece 7, the insulating piece 7 comprises a first insulating piece 71, a second insulating piece 72 and a third insulating piece 73, the first insulating piece 71 comprises a first extending part 711 extending into the mounting holes 51, the second insulating piece 72 comprises a second extending part 721 extending into the mounting holes 51, the first extending part 711 and the second extending part 721 are all arranged in the mounting holes 51 to jointly form an annular part 70, and part of the pole 6 is located outside an inner ring area of the annular part 70 to define an accommodating groove 301 with the annular part 70.

Referring to fig. 1-6, a test fixture 100 may include: a loading assembly 1 and a compacting assembly 2. The loading assembly 1 comprises a loading table 11, a detecting member 12 and a positioning member 14, wherein the positioning member 14 is mounted on the loading table 11 and is used for defining a placement area Z for limiting the setting position of the cover plate assembly 300, and the positioning member 14 is provided with a guide wheel 15 for guiding the cover plate assembly 300 into the placement area Z. The detecting element 12 is a conductive column and penetrates through the loading table 11, the upper end of the supporting portion 121 of the detecting element 12 is contoured with the accommodating groove 301, the lower end of the detecting element 12 is provided with the power receiving area 122, and the elastic element 13 is arranged between the detecting element 12 and the loading table 11, so that the detecting element 12 can move up and down relative to the loading table 11.

The pressing assembly 2 includes: the driving piece 21 and the compressing piece 22, the driving piece 21 can include mounting panel 211 and actuating cylinder 212, and compressing piece 22 includes compressing head 221 and pressure needle 222, and compressing head 221 installs at mounting panel 211, and actuating cylinder 212 drive mounting panel 211 drives compressing head 221 and reciprocates, and compressing head 221's bottom stretches out has pressure needle 222, and pressure needle 222 is used for pushing down apron 5 to make post 6 compress tightly supporting part 121 for post 6 and detection piece 12 can good conductive contact, promotes the validity of follow-up detection.

During testing, the cover plate assembly 300 is placed on the loading table 11 in the placement area Z defined by the positioning piece 14, the cover plate assembly 300 is effectively positioned through the guide wheel 15, then the driving cylinder 212 drives the mounting plate 211 to move downwards, the pressing needle 222 is contacted with the cover plate 5 of the cover plate assembly 300 and is pressed downwards, so that the pole 6 of the cover plate assembly 300 is contacted with the supporting part 121 of the detecting piece 12 until the elastic piece 13 is compressed, and the pole 6 and the supporting part 121 can be tightly attached to each other, and a reliable conductive contact state is presented.

When the high voltage resistance detection circuit discharges, the two connection ends are respectively discharged at high voltage, if the wire near the mounting hole 51 is overlapped with the detection piece 12, the short circuit between the cover plate 5 and the pole 6 is formed, so that whether the wire near the mounting hole 51 is overlapped with the detection piece 12 can be analyzed according to the test result of the high voltage resistance detection circuit.

Therefore, according to the test fixture 100 of the embodiment of the application, the supporting portion 121 may substantially simulate the protrusion of the tab into the accommodating groove 301 and be electrically connected with the post 6 in a contact manner, when the cover plate 5 overflows from the annular portion 70 in the process of processing the mounting hole 51 or the metal wire formed by the groove 52 and other structures near the mounting hole 51, the supporting portion 121 is easily contacted, and is electrically connected with the supporting portion 121, so that the cover plate 5 and the post 6 are electrically connected in a short circuit manner, so that the test fixture 100 of the application can reliably detect whether the metal wire connected with the cover plate 5 exists near the post 6 or not, so as to avoid the problem of insulation failure between the cover plate 5 and the post 6 caused by the electrical connection of the metal wire and the tab when manufacturing the battery cell as much as possible, and improve the yield of the battery cell processing.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A test fixture, its characterized in that includes:

the loading assembly comprises a loading table and a detection piece, wherein the detection piece is arranged on the loading table, two sides of the loading table in a first direction are a first side and a second side respectively, and the detection piece comprises a supporting part which is arranged on the first side and can conduct electricity; and

the compressing assembly comprises a driving piece and a compressing piece, the compressing piece is arranged on the first side, and the driving piece is connected with the compressing piece and at least used for driving the compressing piece to move from the first side to the second side.

2. The test fixture of claim 1, wherein the test fixture is adapted to detect a cover plate assembly, the cover plate assembly comprising: the device comprises a cover plate, a pole and an insulating part, wherein the cover plate is provided with a mounting hole, the pole corresponds to the mounting hole and is in insulating connection with the cover plate through the insulating part, the insulating part comprises an annular part arranged in the mounting hole, the pole is positioned on the outer side of the annular part to define a containing groove between the annular part, and the end part of the supporting part is suitable for extending into the containing groove and supporting the pole.

3. The test fixture of claim 2, wherein an end of the support portion is contoured to the receiving groove, the support portion is clearance fit or interference fit with the annular portion, and an edge of the end of the support portion remote from a side end surface of the loading table is formed as a chamfered edge.

4. The test fixture of claim 2, wherein two of the detecting members are disposed on the loading table at intervals, and the two detecting members are used for respectively supporting the positive electrode post and the negative electrode post on the cover plate.

5. The test fixture of claim 1, wherein the loading table has a through hole communicating the first side and the second side, the detecting member is disposed through the through hole, and a portion of the detecting member located on the second side of the loading table has a power receiving area electrically connected to the supporting portion.

6. The test fixture of claim 5, wherein the detecting member is cylindrical and is entirely of a conductive material.

7. The test fixture of claim 1, wherein the detection member is movable in the first direction relative to the loading table, the loading assembly further comprising an elastic member disposed between the detection member and the loading table and applying an elastic force to the detection member in a direction from the second side to the first side.

8. The test fixture of claim 7, wherein the loading table has a through hole communicating the first side and the second side, and the detecting member is disposed through the through hole and slidably engaged with at least a portion of a wall of the through hole so as to be movable in an axial direction of the through hole.

9. The test fixture of claim 8, wherein the elastic member is a spring and is sleeved outside the detecting member and is fitted in the through hole, and two axial ends of the spring are respectively abutted against the detecting member and the loading table.

10. The test fixture of claim 9, wherein the perforation includes a first hole section and a second hole section sequentially arranged along a direction from the second side to the first side and having sequentially increased apertures so as to form a first step surface at a junction of the first hole section and the second hole section, the detection member includes a first shaft section and a second shaft section sequentially arranged along a direction from the second side to the first side and having sequentially increased shaft diameters so as to form a second step surface at a junction of the first shaft section and the second shaft section, the first shaft section is disposed through the first hole section and the second hole section, the elastic member is disposed outside the first shaft section and is disposed through the second hole section, and both axial ends of the elastic member are respectively stopped against the first step surface and the second step surface.

11. The test fixture of claim 10, wherein the loading table comprises a table base body and an insertion part inserted into the table base body, the insertion part is located on one side of the second hole section away from the first hole section, the through hole comprises a third hole section penetrating through the insertion part, the second shaft section penetrates through and is in sliding fit with the third hole section, the end, close to the first shaft section, of the second shaft section is provided with a protruding portion protruding in the radial direction, one end, away from the first side, of the insertion part is provided with a limiting structure, and the limiting structure is stopped on one side, close to the first side, of the protruding portion.

12. The test fixture of claim 7, wherein the loading station includes a limit structure that limits a limit position of the detection member in a direction from the second side to the first side.

13. The test fixture of claim 1, wherein the loading assembly further comprises a positioning member disposed on the first side of the loading table, the positioning member being of a ring-shaped structure or a plurality of positioning members disposed at intervals so as to surround a placement area, and the detecting member is disposed in the placement area.

14. The test fixture of claim 13, wherein the positioning member is provided with a guide wheel for guiding the part to be tested into and out of the placement area.

15. The test fixture of claim 14, wherein the positioning member has a stop protruding therefrom, the stop protruding to a side of the guide wheel adjacent the placement area, the stop being located on a side of a center plane of the guide wheel adjacent the loading station in the first direction.

16. The test fixture of claim 1, wherein the drive member comprises a drive cylinder for driving the hold-down member in the first direction.

17. The test fixture of claim 1, wherein the hold-down member comprises a hold-down head and a hold-down pin mounted to the hold-down head, the hold-down pin being exposed on a side of the hold-down head adjacent the loading table, the hold-down pin being disposed in plurality and spaced apart relation about the test member.

18. The test fixture of claim 17, wherein the press pin is floatable relative to the press head along the first direction.

19. The test fixture of claim 1, wherein the compression member comprises a compression pin staggered from the detection member, the compression pin being of a conductive material.

20. The test fixture of any one of claims 1-19, wherein a plurality of the detecting members are disposed on the loading table, the pressing assembly comprises a plurality of pressing members, and the plurality of pressing members and the plurality of detecting members are disposed respectively and correspondingly.

21. A test apparatus, comprising: a drive system and a test fixture according to any one of claims 1-20, the drive system comprising a drive rail and a drive assembly, the drive assembly driving the loading assembly along the drive rail relative to the compacting assembly.

22. The test apparatus of claim 21, wherein the test apparatus comprises a plurality of the test jigs, the loading assemblies of the plurality of test jigs being driven by different ones of the drive assemblies and moving along the same drive rail.