CN210604153U

CN210604153U - Battery material test piece clamping device under protection of inert gas

Info

Publication number: CN210604153U
Application number: CN201921401446.XU
Authority: CN
Inventors: 谢静明; 潘哲鑫; 夏勇
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2020-05-22
Anticipated expiration: 2029-08-27

Abstract

The application relates to a battery material test piece clamping device under the protection of inert gas. The battery material test piece clamping device under the protection of inert gas comprises a shell, a first clamping device and a second clamping device. The first clamping device includes a tension guide, a first clamping block, a second clamping block, and a first fastening assembly. One end of the battery material test piece is clamped between the first clamping block and the second clamping block. The other end of the battery material test piece is clamped in the second clamping device. The battery material test piece clamping device under the protection of inert gas adjusts the gap width between the first clamping block and the second clamping block through the first fastening assembly, and then adjusts the clamping force applied to the battery material test piece. The clamping device for the battery material test piece under the protection of the inert gas effectively avoids the damage to the battery material test piece caused by the overlarge clamping force of the fixed end and the stretching end of the stretching experiment machine which directly clamp the battery material test piece.

Description

Battery material test piece clamping device under protection of inert gas

Technical Field

The application relates to the technical field of detection, in particular to a battery material test piece clamping device under the protection of inert gas.

Background

When the electric automobile has a collision accident, the battery inside the electric automobile is easily damaged. If the component materials inside the battery are broken in an accident, a short circuit or even thermal runaway may be induced. In order to understand the safety of the battery deeply, finite element simulation modeling experiments are carried out on the battery, wherein the mechanical properties of the battery component materials need to be obtained through mechanical experiments.

The battery material test piece is in a sheet shape. If the clamping force of the clamping ends at the two ends of the tensile testing machine is large, the battery material test piece is directly fixed, and the battery material test piece is easy to break and damage. How to avoid damage to a battery material test piece in the process of mounting is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a clamping device for a battery material test piece under the protection of inert gas, aiming at the problem that how to avoid the damage of the battery material test piece in the mounting process is needed to be solved urgently.

A clamping device for a battery material test piece under the protection of inert gas is used for stretching the battery material test piece. The clamping device for the battery material test piece under the protection of the inert gas comprises a shell, a first clamping device and a second clamping device. The housing encloses a first space. The first space is filled with an inert gas. The housing includes oppositely disposed top and bottom plates. The top plate is provided with a first through hole. The bottom plate is used for being fixedly connected with the fixed end of the tensile testing machine.

The first clamping device includes a tension guide, a first clamping block, a second clamping block, and a first fastening assembly. One end of the stretching guide piece penetrates through the first through hole and is fixedly connected with a stretching end of the stretching experiment machine, the stretching end drives the stretching guide piece (40) to slide along a first direction, and the pulling direction of the stretching experiment machine is the first direction. The first clamping block is accommodated in the first space. The first clamping block is fixed to the other end of the tension guide. The second clamping block is accommodated in the first space.

The second clamping block and the first clamping block are oppositely arranged at intervals along a second direction. One end of the battery material test piece is clamped between the first clamping block and the second clamping block. The second direction is perpendicular to the first direction. The first fastening component is received in the first space. The first fastening assembly is used for adjusting the width of a gap between the first clamping block and the second clamping block so that the first clamping block and the second clamping block clamp the battery material test piece.

The second clamping device is accommodated in the first space. The second clamping device and the first clamping device are arranged oppositely at intervals along a first direction, the second clamping device is used for clamping and fixing the other end of the battery material test piece, and the second clamping device is fixed on the surface, close to the first space, of the bottom plate.

In one embodiment, the first fastening assembly includes a fastening ring and an adjustment member.

The fastening ring is sleeved on the first clamping block and the second clamping block. The radial end face of the fastening ring is perpendicular to the first direction, and the fastening ring is provided with a notch. The adjusting piece is arranged in the notch and used for adjusting the width of the notch so as to adjust the width of a gap between the first clamping block and the second clamping block.

In one embodiment, the fastening ring has a first bending portion and a second bending portion opposite to each other at the notch, the first bending portion defines a second through hole, the second bending portion defines a third through hole, and the adjusting member includes a wrench and a connecting portion.

The wrench includes an eccentric shaft and a rotating portion. The rotating part is fixedly connected with the eccentric shaft, and the rotating part drives the eccentric shaft to rotate around the axis of the eccentric shaft. The connecting part penetrates through the second through hole and the third through hole to be connected with the eccentric shaft in a rotating mode. The surface of the eccentric shaft is in contact with the surface of the second bending part. When the wrench is located at the first position, the wrench extrudes the first clamping block to be close to the second clamping block, and the width of a gap between the first clamping block and the second clamping block is equal to the thickness of the battery material test piece.

In one embodiment, the battery material specimen clamping device under the protection of inert gas further comprises a sealing seat. The seal seat is of a cylindrical structure. The cylindrical structure includes a first end and a second end. The first end is provided with a third bending part. The sealing seat is fixed to the first through hole. The third bending part is attached to the edge of the first through hole. The second end extends into the first space and the tension guide passes through the tubular structure.

In one embodiment, the battery material specimen clamping device under inert gas protection further comprises a first seal. The first seal is received in the first space. The first sealing element is sleeved on the outer wall of the cylindrical structure and attached to the inner surface of the top plate.

In one embodiment, the battery material specimen clamping device under the protection of inert gas further comprises a first sealing ring, a second sealing ring and a flexible sealing film.

The first seal ring is accommodated in the first space. The first sealing ring is sleeved on the cylindrical structure, and the first sealing element surrounds the first sealing ring. The second seal is received in the first space. The first sealing element is sleeved on the stretching guide element. The second seal ring is accommodated in the first space. The second sealing ring is sleeved on the stretching guide member, and the second sealing member surrounds the second sealing ring. The flexible sealing membrane is accommodated in the first space, sleeved on the stretching guide member and communicated with the first sealing ring and the second sealing ring.

In one embodiment, the battery material specimen clamping device under inert gas protection further comprises a force sensor. The force sensor is accommodated in the first space. One end of the force sensor is fixedly connected with the second clamping device, and the other end of the force sensor is fixedly connected with the inner surface of the bottom plate.

In one embodiment, the battery material test piece clamping device under the protection of inert gas further comprises a first connecting piece. One end of the first connecting piece is fixedly connected with the stretching guide piece, and the other end of the first connecting piece is fixedly connected with the stretching end of the stretching experiment machine.

In one embodiment, the battery material specimen holding device under inert gas protection further comprises a second connecting member. One end of the second connecting piece is fixedly connected with the bottom plate. The other end of the second connecting piece is fixedly connected with the fixed end of the tensile testing machine.

In one embodiment, the tensile guide member is provided with a first threaded hole along the radial direction, and the battery material test piece clamping device under the protection of inert gas further comprises a fixing device. The fixing device is sleeved on the stretching guide piece and fixed on the outer surface of the top plate. And the fixing device is provided with a second threaded hole corresponding to the first threaded hole. The second threaded hole and the first threaded hole are used for screwing in screws to fix the tension guide relative to the top plate.

In one embodiment, the housing further comprises a first panel disposed between the top plate and the top plate, and the inert gas protected battery material specimen clamping device further comprises a first cover disposed on the first panel.

In one embodiment, the clamping device for the battery material test piece under the protection of the inert gas further comprises a sealing rubber ring, and the sealing rubber ring is arranged between the first cover body and the first panel. In one embodiment, the housing further comprises a second panel. The second panel and the first panel are arranged at intervals relatively and are arranged between the top plate and the bottom plate. The first cover body and the second panel are made of transparent materials. The battery material test piece clamping device under the protection of the inert gas further comprises a camera device. The lens of the camera device faces the first cover body or the second panel and is arranged opposite to the first cover body or the second panel at an interval.

The application provides battery material test piece clamping device under inert gas protection includes casing, first clamping device and second clamping device. The housing encloses a first space. The housing includes oppositely disposed top and bottom plates. The top plate is provided with a first through hole. The bottom plate is fixedly connected with the fixed end. The second clamping device is used for clamping and fixing the other end of the battery material test piece, and the second clamping device is fixed on the inner surface of the bottom plate. The clamping device for the battery material test piece under the protection of the inert gas is used for being fixedly connected with a stretching end and a fixing end of a stretching experiment machine so as to stretch the battery material test piece. The first clamping device includes a tension guide, a first clamping block, a second clamping block, and a first fastening assembly. One end of the stretching guide piece penetrates through the first through hole and is fixedly connected with the stretching end. The first clamping block is fixed to the other end of the tension guide. The second clamping block and the first clamping block are arranged at intervals relatively. One end of the battery material test piece is clamped between the first clamping block and the second clamping block. The other end of the battery material test piece is clamped in the second clamping device. The first fastening assembly is used for adjusting the gap width between the first clamping block and the second clamping block. The first clamping block and the second clamping block are matched with the battery material test piece in shape. The battery material test piece is fixed by means of friction force between the battery material test piece and the first clamping block and between the battery material test piece and the second clamping block. The battery material test piece clamping device under the protection of the inert gas adjusts the width of a gap between the first clamping block and the second clamping block through the first fastening assembly, and then adjusts the clamping force applied to the battery material test piece. The clamping device for the battery material test piece under the protection of the inert gas effectively avoids the damage to the battery material test piece caused by the overlarge clamping force of the fixed end and the stretching end of the stretching experiment machine which directly clamp the battery material test piece.

The battery material test piece in a high charge state has strong chemical activity, is easy to generate oxidation reaction with air, and changes the appearance and mechanical characteristics. The first space is filled with inert gas, so that the battery material test piece can be prevented from being oxidized by air before the experiment, and accurate mechanical properties can be obtained.

Drawings

Fig. 1 is an overall structural view of a battery material specimen clamping device under the protection of inert gas provided in an embodiment of the present application;

FIG. 2 is a cross-sectional view taken along the line A-A of the battery material specimen clamping device under the inert gas protection provided in one embodiment of the present application;

FIG. 3 is a cross-sectional view taken in the direction B-B of the battery material specimen clamping device under the inert gas protection provided in one embodiment of the present application;

FIG. 4 is a cross-sectional view in the direction C-C of the battery material specimen clamping device under the inert gas protection provided in one embodiment of the present application;

FIG. 5 is an enlarged partial view of a cell material specimen clamping device under inert gas shielding as provided in an embodiment of the present application;

fig. 6 is a partial enlarged view E of the battery material specimen clamping device under the inert gas protection provided in one embodiment of the present application.

Reference numerals:

experimental apparatus 10

Housing 20

First space 201

First via 202

Top plate 210

Bottom plate 220

First panel 230

Second panel 240

First cover 250

First holding device 30

Tension guide 40

First screw hole 401

Fixing device 410

Second screw hole 411

First clamping block 50

Second gripper block 60

First fastening assembly 70

Fastening ring 710

Notch 701

First bent part 711

A second bending part 712

Adjusting part 720

Second via 713

Third via 714

Spanner 721

Eccentric shaft 722

Rotating part 723

Connecting part 724

Second holding device 80

Third clamping block 810

Fourth gripper block 820

Second fastening assembly 830

Sealing seat 110

First end 111

Second end 112

The third bending part 113

First seal 120

First seal ring 130

Second seal 140

Second seal ring 150

Flexible sealing film 160

Force sensor 170

First connecting member 180

Second connecting member 190

Image pickup device 90

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

With the widespread use of lithium ion batteries in electric vehicles and electronic devices, importance is attached to the safety of lithium ion batteries. When the electric automobile has a collision accident, the battery inside the electric automobile is easily damaged. If the component materials inside the battery are broken and fail, internal short circuits and even thermal runaway are caused, thereby causing serious accidents. In order to understand the safety of the battery deeply, finite element simulation modeling work is carried out on the battery, and the mechanical properties of the battery material are key input parameters.

The battery material test piece is in a sheet shape. If the clamping force of the clamping ends at the two ends of the tensile testing machine is large, the battery material test piece is directly fixed, and the battery material test piece is easy to break and damage.

Referring to fig. 1, 2 and 3, the embodiment of the present application provides a battery material specimen clamping device 10 under inert gas protection for stretching the battery material specimen 100. The inert gas protected battery material test piece clamping device 10 includes a housing 20, a first clamping device 30 and a second clamping device 80. The housing 20 encloses a first space 201. The first space 201 is filled with an inert gas. The housing 20 includes a top plate 210 and a bottom plate 220 disposed opposite to each other. The top plate 210 is provided with a first through hole 202. The bottom plate 220 is used for being fixedly connected with a fixed end of the tensile testing machine.

The first clamping device 30 includes a tension guide 40, a first clamping block 50, a second clamping block 60, and a first fastening assembly 70. One end of the stretching guide member 40 penetrates through the first through hole 202 and is used for being fixedly connected with a stretching end of the stretching experiment machine, the stretching end drives the stretching guide member (40) to slide along a first direction, and the pulling direction of the stretching experiment machine is the first direction. The first clamping block 50 is received in the first space 201. The first clamping block 50 is fixed to the other end of the tension guide 40. The second clamping block 60 is received in the first space 201.

The second clamping block 60 is disposed opposite to the first clamping block 50 along the second direction at an interval. One end of the battery material test piece 100 is clamped between the first clamping block 50 and the second clamping block 60. The second direction is perpendicular to the first direction. The first fastening member 70 is received in the first space 201. The first fastening assembly 70 is used for adjusting the gap width between the first clamping block 50 and the second clamping block 60, so that the first clamping block 50 and the second clamping block 60 clamp the battery material test piece 100.

The second clamping device 80 is received in the first space 201. The second holding device 80 is spaced apart from the first holding device 30 in a first direction. The second clamping device 80 is used for clamping and fixing the other end of the battery material test piece 100, and the second clamping device 80 is fixed on the surface of the bottom plate 220 close to the first space 201.

The clamping device 10 for the battery material test piece under the protection of the inert gas provided by the embodiment of the application is used for adjusting the gap width between the first clamping block 50 and the second clamping block 60 through the first fastening assembly 70, so that the battery material test piece 100 is clamped by the first clamping block 50 and the second clamping block 60. Friction is generated between the first clamping block 50 and the second clamping block 60 and the surface of the battery material test piece 100. The battery material test piece 100 is fixed by the frictional force. The clamping component of the battery material test piece clamping device 10 under the protection of the inert gas is matched with the shape of the battery material test piece 100. The clamping device 10 for the battery material test piece under the protection of the inert gas adjusts the width of the gap between the first clamping block 50 and the second clamping block 60 through the first fastening assembly 70, so as to control the clamping force applied to the battery material test piece 100. The clamping device 10 for the battery material test piece under the protection of the inert gas avoids the damage and the damage of the battery material test piece 100 caused by the overlarge clamping force. The battery material test piece clamping device 10 under the protection of the inert gas effectively protects the battery material test piece and avoids damage during installation.

The probability of internal short circuit and thermal runaway is different and the danger degree is different due to different charge states of the batteries. Batteries at high state of charge are more prone to internal short circuits and thermal runaway. The electrode material in a high charge state has strong chemical activity, is easy to generate oxidation reaction with air, and changes the appearance and mechanical characteristics. The mechanical test of the battery material in the prior art is directly carried out in the air, so that the electrode material is oxidized by the air before the test, and the accurate mechanical property of the electrode material cannot be obtained. The problem that the battery in a high charge state is easy to generate oxidation reaction with air is solved. In the embodiment of the present invention, the first space 201 is filled with an inert gas, so that the battery in a high charge state can be prevented from undergoing an oxidation reaction with air. Each component of the battery material test piece clamping device 10 under the protection of the inert gas is designed in a miniaturized manner, and the process of fixedly clamping the battery material test piece 100 on the battery material test piece clamping device 10 under the protection of the inert gas can be carried out in an inert gas operation box. After the battery material test piece 100 is mounted on the battery material test piece clamping device 10 in the inert gas operation box, the battery material test piece clamping device 10 is moved out of the inert gas operation box. And finally, fixing the battery material test piece clamping device 10 on the tensile experiment device to perform tensile experiment.

In one embodiment, the inert gas comprises helium or neon. The positive electrode material of the lithium ion battery is lithium salt, and the negative electrode material is graphite. Both the anode material and the cathode material of the lithium ion battery need to be subjected to tensile mechanical experiments. Helium or neon is chemically stable. Even under a high charge state, the anode material and the cathode material do not have oxidation reaction with helium or neon, so that the accuracy of mechanical property detection is ensured.

Referring also to fig. 4, in one embodiment, the first fastening assembly 70 includes a fastening ring 710 and an adjustment member 720. The fastening ring 710 is sleeved on the first clamping block 50 and the second clamping block 60. The radial end surface of the fastening ring 710 is perpendicular to the first direction. The fastening ring 710 is provided with a notch 701. The adjusting member 720 is disposed in the notch 701, and is configured to adjust the width of the notch 701, so as to adjust the gap width between the first clamping block 50 and the second clamping block 60.

The fastening ring 710 is provided with the notch 701. The width of the notch 701 may vary. When the width of the notch 701 is increased, the diameter of the fastening ring 710 is increased. The gap width between the first clamping block 50 and the second clamping block 60 becomes large. The width of the gap between the first clamping block 50 and the second clamping block 60 is greater than the width of the battery material test piece 100. The battery material test piece 100 can now be freely removed.

As the width of the notch 701 becomes smaller, the diameter of the fastening ring 710 becomes smaller. The gap width between the first clamping block 50 and the second clamping block 60 becomes smaller. The width of the gap between the first clamping block 50 and the second clamping block 60 is equal to the width of the battery material test piece 100 or slightly smaller than the width of the battery material test piece 100. The battery material test piece 100 is now clamped.

In one embodiment, the fastening ring 710 has a first bent portion 711 and a second bent portion 712 disposed opposite to each other in the notch 701, the first bent portion 711 defines a second through hole 713, the second bent portion 712 defines a third through hole 714, and the adjusting member 720 includes a wrench 721 and a connecting portion 724.

The wrench 721 includes an eccentric shaft 722 and a rotating part 723. The rotating portion 723 is fixedly connected to the eccentric shaft 722. The rotating portion 723 drives the eccentric shaft 722 to rotate around the axis of the eccentric shaft 722. The connecting portion 724 is rotatably connected to the eccentric shaft 722 through the second through hole 713 and the third through hole 714. A surface of the eccentric shaft 722 is in contact with a surface of the second bent portion 712. When the wrench 721 is in the first position, the wrench 721 presses the first clamping block 50 close to the second clamping block 60, and the gap width between the first clamping block 50 and the second clamping block 60 is equal to the thickness of the battery material test piece 100.

The rotating portion 723 drives the eccentric shaft 722 to rotate around the axis of the eccentric shaft 722. A surface of the eccentric shaft 722 is in contact with a surface of the second bent portion 712. In the rotating process, the second bent portion 712 is pressed to be close to or far from the bent portion 711. When the wrench 721 drives the portion of the surface corresponding to the maximum diameter of the eccentric shaft 722 to contact the surface of the second bent portion 712, the distance between the first bent portion 711 and the second bent portion 712 is the smallest. The width of the notch 701 is the smallest. The fastening ring 710 has a smallest diameter. The gap width between the first clamping block 50 and the second clamping block 60 is minimal. The width of the gap between the first clamping block 50 and the second clamping block 60 is equal to the width of the battery material test piece 100 or slightly smaller than the width of the battery material test piece 100. The battery material test piece 100 is now clamped.

The wrench 721 can secure a minimum value of the width of the gap between the first clamping block 50 and the second clamping block 60, which is equal to the width of the battery material specimen 100 or slightly smaller than the width of the battery material specimen 100, to be fixed. The battery material test piece 100 is not damaged due to the small gap width between the first clamping block 50 and the second clamping block 60. The wrench 721 effectively protects the battery material test piece 100.

In one embodiment, a fastening screw is used in place of the wrench 721. The connecting portion 724 is of a bolt structure. The bolt structure passes through the second through hole 713 and the third through hole 714, and the fastening screw is screwed to a penetrating end of the bolt structure. The position of the fastening screw on the bolt structure is adjusted to adjust the gap width between the first clamping block 50 and the second clamping block 60.

Referring also to fig. 5, in one embodiment, the battery material specimen clamping device 10 under inert gas protection further includes a sealing seat 110. The seal holder 110 has a cylindrical structure. The cylindrical structure includes a first end 111 and a second end 11. The first end 111 has a third bending part 113. The seal seat 110 is fixed to the first through hole 202. The third bending portion 113 is attached to the edge of the first through hole 202. The second end 112 extends into the first space 201 and the tension guide 40 passes through the tubular structure. The sealing seat 110 can prevent external air from entering the first space 201.

The sealing seat 110 is disposed in the first through hole 202, and prevents external air from passing through the first through hole 202, so that the housing 20 is in a sealed state, and the first space 201 maintains an inert gas environment. In one embodiment, the battery material test piece clamping device under inert gas protection 10 further includes a first seal 120. The first seal 120 is received in the first space 201. The first sealing element 120 is sleeved on the outer wall of the cylindrical structure and attached to the inner surface of the top plate 210. The first sealing member 120 further prevents external gas from entering the first space 201, so that the housing 20 is in a sealed state, and the first space 201 maintains an inert gas environment.

In one embodiment, the inert gas protected battery material specimen clamping device 10 further includes a first seal ring 130, a second seal ring 140, a second seal ring 150, and a flexible sealing membrane 160.

The first seal ring 130 is received in the first space 201. The first sealing ring 130 is sleeved on the cylindrical structure, and the first sealing element 120 surrounds the first sealing ring 130. The second seal 140 is received in the first space 201. The first seal 120 is disposed around the tension guide 40. The second seal ring 150 is accommodated in the first space 201. The second sealing ring 150 is sleeved on the tensile guide 40, and the second sealing member 140 surrounds the second sealing ring 150. The flexible sealing membrane 160 is received in the first space 201, sleeved on the tensile guide 40, and communicated with the first sealing ring 130 and the second sealing ring 150.

A sealed space is formed between the first sealing ring 130, the second sealing ring 150 and the flexible sealing film 160. A small amount of outside air enters the sealed space without entering the first space 201, further ensuring the airtightness of the first space 201. The first sealing ring 130, the second sealing ring 150 and the flexible sealing film 160 form a sealed space therebetween, which has the function of intercepting external air, so that the housing 20 is ensured to be in a sealed state, and the first space 201 maintains an inert gas environment.

Referring also to fig. 6, in one embodiment, the second clamping device 80 includes a third clamping block 810, a fourth clamping block 820, and a second fastening assembly 830. The third clamping block 810 and the fourth clamping block 820 are oppositely arranged at intervals along the second direction. The other end of the battery material test piece 100 is clamped between the third clamping block 810 and the fourth clamping block 820. The first fastening member 70 is received in the first space 201. The second fastening assembly 830 is used for adjusting the gap width between the third clamping block 810 and the fourth clamping block 820, so that the third clamping block 810 and the fourth clamping block 820 clamp the battery material test piece 100.

In one embodiment, the battery material specimen clamping device under inert gas protection 10 further includes a force sensor 170. The force sensor 170 is received in the first space 201. One end of the force sensor 170 is fixedly connected to the second clamping device 80, and the other end of the force sensor 170 is fixedly connected to the inner surface of the bottom plate 220. During the tensile test, the force sensor 170 is used to detect the magnitude of the tensile force.

In one embodiment, the force sensor 170 is connected to an end of the third clamping block 810 near the bottom plate 220 by a screw.

In one embodiment, the battery material test piece clamping device under inert gas protection 10 further includes a first connector 180. One end of the first connecting member 180 is fixedly connected to the tensile guide 40, and the other end of the first connecting member 180 is fixedly connected to a tensile end of the tensile testing machine.

The first connecting member 180 has a cylindrical structure. Grooves are symmetrically formed in one end, close to the stretching end, of the first connecting piece 180, so that a cuboid boss is formed. And the stretching end of the stretching experiment machine is tightly clamped with the cuboid boss.

In one embodiment, the battery material test piece clamping device under inert gas protection 10 further comprises a second connector 190. One end of the second connecting member 190 is fixedly connected to the base plate 220. The other end of the second connecting piece 190 is fixedly connected with the fixed end of the tensile testing machine.

The bottom plate 220 is provided with a threaded hole, and the second connecting piece 190 is provided with an external thread matched with the threaded hole. When the second connector 190 is screwed into the bottom plate 220, the second connector 190 is fixed to the bottom plate 220.

In one embodiment, the tensile guide 40 is provided with a first threaded hole 401 along the radial direction, and the cell material specimen holding device 10 under the protection of inert gas further comprises a fixing device 410. The fixing device 410 is sleeved on the extension guide 40 and fixed to the outer surface of the top plate 210. The fixing device 410 is provided with a second threaded hole 411 corresponding to the first threaded hole 401. The second screw hole 411 and the first screw hole 401 are used for screwing in screws to fix the tension guide 40 with respect to the top plate 210.

In order to prevent the tensile guide 40 from sliding in the first direction during the clamping mounting of the battery material test piece 100, screws are screwed into the second screw holes 411 and the first screw holes 401 to fix the tensile guide 40 with respect to the top plate 210.

In one embodiment, the housing 20 further includes a first panel 230, the first panel 230 is disposed between the top plate 210 and the bottom plate 220, and the inert gas protected battery material specimen clamping device 10 further includes a first cover 250, and the first cover 250 is disposed on the first panel 230.

The first cover 250 is detachable. A sealing ring is disposed between the first cover 250 and the first panel 230 to seal a gap between the first cover 250 and the first panel 230.

In one embodiment, the battery material specimen clamping device 10 under the protection of inert gas further includes a sealing rubber ring, which is disposed between the first cover 250 and the first panel 230, and prevents external gas from entering the first space 201, so that the first space 201 maintains an inert gas environment, thereby ensuring the accuracy of the experiment.

In one embodiment, the housing 20 further includes a second panel 240. The second panel 240 is spaced apart from the first panel 230 and is disposed between the top plate 210 and the top plate 210. The first cover 250 and the second panel 240 are made of transparent materials. The battery material test piece clamping device 10 under the protection of the inert gas further comprises an image pickup device 90. The lens of the image capturing device 90 faces the first cover 250 or the second panel 240, and is disposed opposite to the first cover 250 or the second panel 240 at an interval. The first cover 250 or the second panel 240 is made of a transparent material. The camera device 90 can acquire the shape change process of the battery material test piece 100 in the tensile experiment process. At the same time the camera 90 records the experimental time.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-described examples merely represent several embodiments of the present application and are not to be construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A battery material specimen clamping device under inert gas shielding for stretching the battery material specimen (100), comprising:

the stretching experiment machine comprises a shell (20) and a stretching experiment machine, wherein the shell (20) surrounds and forms a first space (201), the first space (201) is filled with inert gas, the shell (20) comprises a top plate (210) and a bottom plate (220) which are oppositely arranged, the top plate (210) is provided with a first through hole (202), and the bottom plate (220) is fixedly connected with the fixed end of the stretching experiment machine;

a first clamping device (30) comprising:

the stretching guide piece (40), one end of the stretching guide piece (40) passes through the first through hole (202) and is used for being fixedly connected with a stretching end of the stretching experiment machine, the stretching end drives the stretching guide piece (40) to slide along a first direction, and the pulling direction of the stretching experiment machine is the first direction;

a first clamping block (50) accommodated in the first space (201), the first clamping block (50) being fixed to the other end of the tension guide (40);

the second clamping block (60) is accommodated in the first space (201), the second clamping block (60) and the first clamping block (50) are oppositely arranged at intervals along a second direction, one end of the battery material test piece (100) is clamped between the first clamping block (50) and the second clamping block (60), and the second direction is perpendicular to the first direction;

a first fastening assembly (70) received in the first space (201), wherein the first fastening assembly (70) is used for adjusting the gap width between the first clamping block (50) and the second clamping block (60) so as to clamp the battery material test piece (100) by the first clamping block (50) and the second clamping block (60);

the second clamping device (80) is accommodated in the first space (201), the second clamping device (80) and the first clamping device (30) are arranged at intervals along the first direction, the second clamping device (80) is used for clamping and fixing the other end of the battery material test piece (100), and the second clamping device (80) is fixed on the surface, close to the first space (201), of the bottom plate (220).

2. The inert gas protected battery material test piece clamping device according to claim 1, wherein the first fastening assembly (70) comprises:

the fastening ring (710) is sleeved on the first clamping block (50) and the second clamping block (60), the radial end face of the fastening ring (710) is perpendicular to the first direction, and a notch (701) is formed in the fastening ring (710);

the adjusting piece (720) is arranged in the gap (701) and used for adjusting the width of the gap (701) so as to adjust the gap width between the first clamping block (50) and the second clamping block (60).

3. The inert gas protected battery material test piece clamping device according to claim 2, wherein the fastening ring (710) has a first bent portion (711) and a second bent portion (712) opposite to each other at the notch (701), the first bent portion (711) is provided with a second through hole (713), the second bent portion (712) is provided with a third through hole (714), and the adjusting member (720) comprises:

the wrench (721) comprises an eccentric shaft (722) and a rotating part (723), the rotating part (723) is fixedly connected with the eccentric shaft (722), and the rotating part (723) drives the eccentric shaft (722) to rotate around the axis of the eccentric shaft (722);

a connecting part (724) rotatably connected to the eccentric shaft (722) through the second through hole (713) and the third through hole (714), a surface of the eccentric shaft (722) being in contact with a surface of the second bent part (712);

when the wrench (721) is in a first position, the wrench (721) presses the first clamping block (50) close to the second clamping block (60), and the gap width between the first clamping block (50) and the second clamping block (60) is equal to the thickness of the battery material test piece (100).

4. The inert gas protected battery material specimen clamping device according to claim 1, further comprising:

the sealing seat (110) is of a cylindrical structure, the cylindrical structure comprises a first end (111) and a second end (112), the first end (111) is provided with a third bending part (113), the sealing seat (110) is fixed to the first through hole (202), the third bending part (113) is attached to the edge of the first through hole (202), the second end (112) extends into the first space (201), and the stretching guide piece (40) penetrates through the cylindrical structure.

5. The inert gas protected battery material specimen clamping device according to claim 4, further comprising:

the first sealing element (120) is accommodated in the first space (201), and the first sealing element (120) is sleeved on the outer wall of the cylindrical structure and attached to the inner surface of the top plate (210).

6. The inert gas protected battery material specimen clamping device according to claim 5, further comprising:

a first seal ring (130) received in the first space (201), the first seal ring (130) being fitted around the cylindrical structure, and the first seal member (120) surrounding the first seal ring (130);

a second sealing member (140) received in the first space (201), the first sealing member (120) being fitted to the tension guide (40);

a second seal ring (150) housed in the first space (201), the second seal ring (150) being fitted to the tension guide (40), and the second seal member (140) surrounding the second seal ring (150);

a flexible sealing membrane (160) received in the first space (201), sleeved on the tensile guide (40), and communicated with the first sealing ring (130) and the second sealing ring (150).

7. The inert gas protected battery material specimen clamping device according to claim 1, further comprising:

the force sensor (170) is accommodated in the first space (201), one end of the force sensor (170) is fixedly connected with the second clamping device (80), and the other end of the force sensor (170) is fixedly connected with the inner surface of the bottom plate (220).

8. The inert gas protected battery material specimen clamping device according to claim 1, further comprising:

and one end of the first connecting piece (180) is fixedly connected with the stretching guide piece (40), and the other end of the first connecting piece (180) is fixedly connected with the stretching end of the stretching experiment machine.

9. The inert gas protected battery material specimen clamping device according to claim 1, further comprising:

and one end of the second connecting piece (190) is fixedly connected with the bottom plate (220), and the other end of the second connecting piece (190) is fixedly connected with the fixed end of the tensile testing machine.

10. The inert gas protected battery material specimen holding apparatus according to claim 1, wherein the tensile guide (40) is radially provided with a first threaded hole (401), and the inert gas protected battery material specimen holding apparatus (10) further comprises:

and the fixing device (410) is sleeved on the stretching guide piece (40) and fixed on the outer surface of the top plate (210), a second threaded hole (411) corresponding to the first threaded hole (401) is formed in the fixing device (410), and the second threaded hole (411) and the first threaded hole (401) are used for screwing in screws so that the stretching guide piece (40) is fixed relative to the top plate (210).

11. The inert gas blanketed battery material test piece clamping device as claimed in claim 1, wherein the housing (20) further comprises a first face plate (230), the first face plate (230) being disposed between the top plate (210) and the top plate (210), the inert gas blanketed battery material test piece clamping device (10) further comprising:

and a first cover (250) disposed on the first panel (230).

12. The inert gas protected battery material specimen clamping device of claim 11, further comprising:

a sealant ring disposed between the first cover (250) and the first panel (230).

13. The inert gas protected battery material test piece clamping device according to claim 12, wherein the housing (20) further comprises a second face plate (240), the second face plate (240) being spaced opposite the first face plate (230) and being disposed between the top plate (210) and the bottom plate (220), the first cover (250) and the second face plate (240) being transparent materials, the inert gas protected battery material test piece clamping device (10) further comprising:

and an imaging device (90) having a lens facing the first cover (250) or the second panel (240) and disposed at an interval opposite to the first cover (250) or the second panel (240).