CN220207676U

CN220207676U - Clamp for relaxation test of lithium battery

Info

Publication number: CN220207676U
Application number: CN202321440363.8U
Authority: CN
Inventors: 陈翔; 裴婷婷; 陈利权; 蹇兴文; 吴天宇; 王振园
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2023-12-19
Anticipated expiration: 2033-06-07

Abstract

The utility model relates to a testing device of a lithium battery, in particular to a clamp for relaxation testing of the lithium battery, which comprises a pressing device and a bearing device, wherein the pressing device comprises a pressing plate, a press machine is arranged on the top surface of the pressing plate and is used for applying pressure to the lithium battery, the press machine can work according to preset pressing speed and pressing time, the pressing plate is further provided with a measuring device which is used for measuring the descending distance of a plurality of mark points of the pressing plate, the bearing device is used for bearing the lithium battery, and the bearing device comprises a bearing plate which is provided with an adjusting device which can adjust the angle of the lithium battery relative to the pressing plate. A fixture for relaxation test of lithium battery solves the problems that the fixture for lithium battery test in the prior art can not ensure that a pressing plate is parallel to the surface of the lithium battery and can not test the relaxation of the lithium battery.

Description

Clamp for relaxation test of lithium battery

Technical Field

The utility model relates to a testing device of a lithium battery, in particular to a fixture for relaxation testing of the lithium battery.

Background

With the wide application of lithium batteries in the fields of mobile communication, electronic appliances and the like, the safety accidents of the lithium batteries are more and more. For many electronic manufacturers, it is a daily task to detect the lithium battery, so it is necessary to detect the battery performance by a standard system to solve the problem of safety and reliability of the battery, so as to avoid the safety accidents such as explosion and the like caused by misuse of the lithium battery and prolong the service life of the lithium battery.

In the reliability test of a battery, a relaxation test is an important one of them. Relaxation, i.e. the process of gradually returning from a certain state to an equilibrium state during a certain graded physical process. And extends to the field of lithium batteries, namely the process of compression change of lithium batteries. Relaxation test, the pressure plate is required to be parallel to the surface of the battery, the applied pressure can be ensured to be perpendicular to the surface of the lithium battery, and further, the deformation of each area of the battery can be ensured to be uniform, so that the result of the relaxation test is reliable. However, the existing lithium battery test fixture has poor parallelism between the pressing plate and the surface of the lithium battery, so that the relaxation test result of the lithium battery is unreliable.

Disclosure of Invention

The utility model aims at: aiming at the problems that in the prior art, the parallelism between a clamp pressing plate of a lithium battery test clamp and the surface of the lithium battery is poor, so that the relaxation test result of the lithium battery is unreliable, the clamp for the relaxation test of the lithium battery is provided.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a fixture for lithium cell relaxation test, contains pushing device, supporting device and measuring device, pushing device contains clamp plate and press, the press is used for applys equipartition pressure, supporting device is used for the bearing lithium cell, supporting device is provided with can adjust supporting device with the adjusting device of the contained angle of clamp plate, measuring device is used for measuring the distance that the mark point of at least three non-collineation of clamp plate descends respectively.

The measuring device may be a conventional scale with a scale, a grating scale, or an existing measuring device such as an infrared distance measuring device. The adjusting device adjusts the included angle between the supporting device and the pressing plate, including the condition of directly adjusting the included angle between the whole supporting device and the pressing plate; also included is adjusting the top surface of the support, i.e., the angle between the surface of the support that contacts the lithium battery and the bottom surface of the platen. The uniform pressure applied by the press can be realized by a mode of matching with a pressing plate covering the top surface of the lithium battery.

The pushing device is located above the lithium battery, and the supporting device is located below the lithium battery. The clamp plate can push down through the press, and the press can work according to corresponding push down speed and push down distance, can be continuous apply corresponding pressure for the lithium cell, and this pressure makes the lithium cell continuous production deformation in the time quantum of predetermineeing, and the press is exerted and is the equipartition pressure, then the deformation volume of lithium cell everywhere is the same. If the corresponding counterweight is directly applied to the pressing plate, the deformation of the lithium battery is completed only at the moment of application and then the corresponding deformation can not exist. Because relaxation of a battery specifically refers to the process of changing the pressure of the battery, relaxation testing can be accomplished using a press. At least three mark points of the pressing plate are not collinear, and the movement form of the pressing plate can be judged. The device for testing the pressing plate can measure the descending distance of a plurality of mark points of the pressing plate at the same time, so that the specific form of the pressing plate in the descending process is judged according to the descending distance of a plurality of mark points. The bearing plate is provided with adjusting device, can adjust the contained angle of lithium cell and clamp plate according to the motion form of clamp plate that measures to make the top surface of lithium cell be on a parallel with as far as possible the clamp plate, thereby make the pressure perpendicular to the top surface of lithium cell that the press applyed, and then can guarantee as far as possible that the compression set of lithium cell is the same in each region at the in-process that test lithium cell relaxes, thereby can obtain better test effect, and then can more accurately test out whether the performance of battery satisfies the requirement.

As a preferred embodiment of the utility model, the measuring device comprises at least three non-collinear grating scales, which are fixed to the platen, one for testing one of the marker points.

The grating ruler, also called grating ruler displacement sensor, grating ruler sensor, is a measuring feedback device for object position movement by utilizing the optical principle of moire fringes. The grating scale is read by detecting the number of moire fringes, and then the displacement and the speed of the object are calculated according to the action of the driving circuit. At least three grating scales are non-collinear and are capable of measuring the motion profile of the platen. The grating ruler is used as a measuring device and is fixed on the pressing plate, so that the descending distance of the mark point of the pressing plate can be reflected rapidly and accurately, and the bearing plate can be adjusted. Even can be according to the distance that the mark point of clamp plate descends to the motion form of prejudgement clamp plate, and then adjustment bearing plate.

As a preferable scheme of the utility model, the flat section of the pressing plate is rectangular, the measuring device comprises four grating scales, and the four grating scales are respectively fixed on four sides of the pressing plate.

The flat cross section of the platen is the cross section perpendicular to the pressure applied by the press. The four grating scales are respectively positioned on the four sides of the pressing plate, so that the movement form of the pressing plate can be intuitively judged, and then the bearing plate is adjusted according to the movement form of the pressing plate.

As a preferred embodiment of the present utility model, the present utility model further comprises a reinforcing member for reinforcing the grating ruler.

Because the center of gravity of the grating ruler is higher, when the grating ruler is fixed on the pressing plate, the fixing piece is additionally arranged, so that the stability of the clamp is improved.

As a preferred embodiment of the utility model, the adjusting device comprises at least three non-collinear jacks, which are fixed to the bottom surface of the support device.

Three non-collinear jacks are fixed on the bottom surface of the bearing plate, and then the included angle between the top surface of the bearing device and the bottom surface of the pressing plate can be adjusted through adjusting the jacks, so that the included angle between the top surface of the lithium battery and the bottom surface of the pressing plate can be adjusted. By using the jack form, the adjustment is facilitated.

As a preferable scheme of the utility model, the adjusting device comprises four jacks, and the four jacks are distributed in a rectangular array.

The jacks are distributed in a rectangular array, namely, four jacks are divided into two groups, each group of two jacks are distributed along a straight line, and the straight line of each group of jacks is parallel to the straight line of the other group of jacks.

As a preferable scheme of the utility model, the bearing device comprises a bearing plate, wherein the top surface of the bearing plate is provided with a limiting piece, and the limiting piece is used for limiting the plane movement direction of the pressing plate.

The locating part is used for avoiding being in the test process, and the clamp plate produces the motion that is on a parallel with the bolster top surface for the deformation of lithium cell is no longer even, influences relaxation test's stability.

As a preferable scheme of the utility model, the limiting piece comprises a plurality of rod pieces which are arranged on the top surface of the bearing plate and perpendicular to the top surface of the bearing plate, and the corresponding position of the pressing plate is provided with an adaptive through hole, and the through hole can be sleeved with the rod pieces.

At least two rod pieces are arranged at the top of the bearing plate, and the through holes are sleeved outside the rod pieces and can limit the translation and rotation of the pressing plate.

As a preferable scheme of the utility model, the top surface of the bearing device is provided with a cushion piece, and the cushion piece is used for supporting the measuring device.

When the height of the lithium battery is too high and the grating ruler cannot measure the pressing distance of the pressing plate, the grating ruler can be lifted by the cushion piece, so that the applicability of the clamp is improved.

As a preferable mode of the present utility model, the pad is a bolt.

The bolt is used as a cushion, so that the adjustment is convenient, and the stability is good.

In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:

1. a anchor clamps for lithium cell relaxation test through pushing down the device setting can last pushing down the press, set up the adjusting device that can adjust the contained angle of lithium cell top surface for the clamp plate bottom surface at the supporting device for the pressure that the press produced can be perpendicular to lithium cell as far as possible, and the press can make the lithium cell last and stable production deformation, make the result that test lithium cell relaxes more accurate, thereby can be as far as possible more accurate test out whether the performance of battery satisfies the requirement, the depth of parallelism of lithium cell test anchor clamps clamp plate and lithium cell surface that has solved prior art existence is poor, make the problem that the result of lithium cell relaxation test is unreliable.

2. The fixture for the relaxation test of the lithium battery comprises four grating scales serving as a measuring device, four jacks serving as adjusting devices, and four grating scales respectively fixed on four sides of a rectangular pressing plate, so that the movement form of the pressing plate can be accurately obtained; the four jacks are distributed in an array, so that the supporting plate is convenient to adjust.

3. A anchor clamps for lithium cell relaxation test sets up the member of perpendicular to bearing board top surface at bearing board top surface, sets up corresponding adaptation degree through-hole on the clamp plate for the clamp plate can not produce the skew in the motion process, does benefit to the stability that promotes the test result.

Drawings

Fig. 1 is a schematic structural diagram of a fixture for relaxation test of lithium battery in example 1;

fig. 2 is a schematic structural diagram of the pressing device in embodiment 1;

fig. 3 is a schematic view of the supporting device in embodiment 1.

The marks in the figure: 1-press machine, 2-grating ruler, 3-pressing plate, 4-bearing plate, 5-jack, 6-limiting piece, 7-pad piece, 8-lithium battery and 9-reinforcement.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Example 1

As shown in fig. 1, a fixture for relaxation test of lithium batteries comprises a pressing device and a supporting device, wherein the pressing device is used for pressing down lithium batteries 8, and the supporting device is used for supporting the lithium batteries 8.

As shown in fig. 1 and 2, the pressing device includes a pressing plate 3, and the flat section of the pressing plate 3 is rectangular. The center of the top surface of clamp plate 3 is provided with press 1, and press 1 can work according to corresponding push down speed and push down distance, then can be continuous apply corresponding pressure for lithium cell 8, and this pressure makes lithium cell 8 continuous production deformation in the time quantum of predetermineeing, and the clamp plate 3 of cooperation cover lithium cell 8 top surface again makes the deformation volume of lithium cell 8 everywhere the same. The top surface of the pressing plate is also provided with four grating scales 2, and the four grating scales 2 are respectively arranged on four sides of the pressing plate 3, so that the movement form of the pressing plate 3 can be intuitively judged, and then the bearing plate 4 is regulated according to the movement form of the pressing plate 3. The grating ruler 2 is also provided with a reinforcement 9, so that the grating ruler 2 is prevented from being skewed. Four through holes are also arranged on the pressing plate 3 and are used for sleeving the limiting piece 6. The size and distribution of the pressure plate 3 is adapted to the limit 6.

As shown in fig. 1 and 3, the support device comprises a support plate 4, and the cross section of the support plate 4 is rectangular. Four jacks 5 are arranged on the bottom surface of the bearing plate 4, and the four jacks 5 are divided into two groups and are respectively arranged on two opposite side edges of the bearing plate 4. The positions of the four jacks 5 are arranged in such a way that the heights of the four sides of the bearing plate 4 can be correspondingly adjusted, and the bearing plate 4 is conveniently adjusted according to the data measured by the grating ruler 2, so that the bearing plate 4 is parallel to the pressing plate 3 as much as possible. The top surface of the bearing plate 4 is also provided with four rod-shaped limiting pieces 6, and the limiting pieces 6 are used for avoiding the movement of the pressing plate 3 parallel to the top surface of the bearing plate in the testing process, so that the pressing plate 3 only deforms a part of the lithium battery 8, and the stability of relaxation testing is affected. The top surface of the supporting plate 4 is also provided with a cushion piece 7, and the cushion piece 7 is used for heightening the grating ruler 2. When the height of the lithium battery 8 is too high, the grating ruler 2 can not measure the pressing distance of the pressing plate 3, and the measuring device can be lifted by the cushion piece 7, so that the applicability of the clamp is improved. In this embodiment, the pad 7 is a bolt, which is convenient to adjust and has good stability.

As shown in fig. 1, the through hole is sleeved on the limiting piece 6, and the bottom of the grating ruler 2 is abutted against the pad piece 7, so that the pressing plate 3 can be fixed without deviation in the moving process.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. A fixture for lithium battery relaxation test, characterized in that, contain pushing device, supporting device and measuring device, pushing device contains clamp plate (3) and press (1), press (1) are used for applys equipartition pressure, supporting device is used for bearing lithium battery (8), supporting device is provided with can adjust supporting device with the adjusting device of contained angle of clamp plate (3), measuring device is used for measuring the distance that at least three non-collinear mark point of clamp plate (3) descends respectively.

2. A fixture for lithium battery relaxation testing according to claim 1, characterized in that the measuring device comprises at least three non-collinear grating scales (2), said grating scales (2) being fixed to the press plate (3), one of said grating scales (2) being used for testing one of said marker points.

3. A fixture for lithium battery relaxation test according to claim 2, characterized in that the flat section of the press plate (3) is rectangular, the measuring device comprises four grating scales (2), and the four grating scales (2) are respectively fixed on four sides of the press plate (3).

4. A fixture for lithium battery relaxation testing according to claim 2, further comprising a reinforcement (9), said reinforcement (9) being used for reinforcing said grating ruler (2).

5. A fixture for lithium battery relaxation testing according to claim 1, characterized in that the adjustment means comprise at least three non-collinear jacks (5), the jacks (5) being fixed to the bottom surface of the holding means.

6. A fixture for lithium battery relaxation testing according to claim 5, characterized in that said adjusting means comprise four of said jacks (5), the four jacks (5) being distributed in a rectangular array.

7. A fixture for relaxation testing of lithium batteries according to any of the claims 1-6, characterized in that said support means comprises a support plate (4), the top surface of said support plate (4) being provided with a stop (6), said stop (6) being adapted to limit the direction of planar movement of said press plate (3).

8. The fixture for relaxation test of lithium batteries according to claim 7, wherein the limiting piece (6) comprises a plurality of rods perpendicular to the top surface of the supporting plate (4), the rods are arranged on the top surface of the supporting plate (4), and the corresponding positions of the pressing plates (3) are provided with matched through holes, and the through holes can be sleeved with the rods.

9. A fixture for relaxation testing of lithium batteries according to any of the claims 2-6, characterized in that said support means top surface is provided with a pad (7), said pad (7) being used for supporting said measuring means.

10. A fixture for lithium battery relaxation test according to claim 9, characterized in that the pad (7) is a bolt.