CN219084991U

CN219084991U - Test fixture

Info

Publication number: CN219084991U
Application number: CN202223295024.3U
Authority: CN
Inventors: 孙仁壮; 王福庆
Original assignee: Huai'an Junsheng New Energy Technology Co ltd; Sinochem Yangzhou Lithium Battery Technology Co Ltd
Current assignee: Huai'an Junsheng New Energy Technology Co ltd; Sinochem Yangzhou Lithium Battery Technology Co Ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-05-26
Anticipated expiration: 2032-12-08

Abstract

The utility model provides a test fixture which comprises a clamping part, wherein the clamping part is used for clamping a battery to be tested, the contact surface of the clamping part, which is contacted with the battery to be tested, is matched with the shape of the battery to be tested, the test fixture also comprises a constant temperature component, the constant temperature component is arranged on the clamping part, and the constant temperature component is arranged close to the contact surface. According to the utility model, the clamping part is arranged to clamp the battery to be tested, the clamping part comprises the contact surface matched with the shape of the battery to be tested, the contact surface limits the position of the battery to be tested in the clamping part after contacting with the outer surface of the battery to be tested, and the influence of loosening, shifting and the like of the battery to be tested in the clamping process or the stress applying process is avoided. In addition, the constant temperature assembly is further arranged, and the constant temperature assembly is used for keeping the temperature of the battery to be tested constant all the time so as to ensure that the temperature of the battery to be tested is unchanged when stress is applied and capacity attenuation test is carried out, and the influence of temperature rise on test data and test results is avoided.

Description

Test fixture

Technical Field

The utility model relates to the technical field of lithium battery detection, in particular to a test fixture.

Background

The expansion force of the lithium battery is a common parameter for developing the structural design and capacity attenuation model of the battery module at present, and has important significance. The lithium battery expansion force clamp is generally applied to a battery cycle test process, and is used for collecting stress change and measuring the relation between capacity attenuation and expansion force. The lithium battery expansion device mainly comprises a fixed clamping plate, a limiting column and a force sensor, wherein the lithium battery is fixed and limited by applying pretightening force, and the stress change can be converted into an electric signal through the force sensor and then converted into an expansion force through the signal.

The existing expansion force clamps of the lithium battery are more flat plate type expansion force clamps, are mostly applied to batteries with square and soft package surfaces and smooth, and are difficult to limit and obtain actual expansion force of the cylindrical battery. On the other hand, when analyzing the capacity fade and expansion force data, the initial temperature during the circulation is usually taken as the temperature value of life fade at the temperature, and the temperature rise during the charge and discharge of the battery is not considered, but the actually measured capacity fade is not in a constant temperature state, so that the life model for the capacity fade or expansion force is inaccurate.

Disclosure of Invention

The utility model aims to overcome the defect of inaccurate detection value caused by temperature rise in the battery detection process in the prior art, and provides a test fixture.

The utility model solves the technical problems by the following technical scheme:

the utility model provides a test fixture, its is including clamping part, the clamping part is used for pressing from both sides tight battery that awaits measuring, in the clamping part with the contact surface that awaits measuring battery contacted with the shape phase-match of battery that awaits measuring, test fixture still includes constant temperature component, constant temperature component locates the clamping part, just constant temperature component is close to the contact surface sets up.

In this scheme, clamping part is provided with the contact surface that contacts with the battery that awaits measuring, this contact surface and the shape assorted of battery that awaits measuring to improve the stability that the battery that awaits measuring is arranged in this test fixture when realizing pressing from both sides tight battery that awaits measuring, prevent that the battery that awaits measuring from appearing not hard up or the condition such as drunkenness, and this test fixture still is provided with constant temperature component, constant temperature component is close to the contact surface setting, in order to keep the battery that awaits measuring constant temperature when the test, avoid because of the test data inaccuracy that the battery temperature that awaits measuring risees and leads to, improve the efficiency of software testing to the battery that awaits measuring.

Preferably, the constant temperature assembly comprises a water cooling pipe and a circulating pipe, the water cooling pipe is arranged at the clamping part, the circulating pipe is communicated with the water cooling pipe, the water cooling pipe and the circulating pipe form a circulating loop, constant temperature medium is used for flowing in the circulating loop, and the circulating pipe is positioned at the outer peripheral side of the clamping part.

In this scheme, the water-cooled tube sets up in the contact surface of clamping part, is close to the battery that awaits measuring and improves the constant temperature effect to the battery that awaits measuring, and the circulating pipe is located the periphery side of clamping part and is used for with the water-cooling machine intercommunication, and the water-cooled tube communicates with the circulating pipe and forms the circulation return circuit, and circulation constant temperature medium flows in the circulation return circuit in order to flow in the water-cooled tube through the mode and take away the temperature that the battery surface that awaits measuring risen when the test for the battery that awaits measuring that contacts with the contact surface keeps the temperature invariable.

Preferably, the test fixture further comprises a detection mechanism, the detection mechanism comprises a pressure sensor, and a detection end of the pressure sensor is abutted to the clamping part;

the first end of the driving mechanism is connected with the clamping part, the second end of the driving mechanism is connected with the detection mechanism, and the driving mechanism is used for driving the pressure sensor to be close to or far away from the clamping part.

In this scheme, detection mechanism is arranged in to the battery that awaits measuring in the clamping part exert stress, and actuating mechanism is arranged in driving detection mechanism is close to or keeps away from the clamping part to make pressure sensor butt on the clamping part, clamping part presss from both sides tight battery that awaits measuring in order to realize the stress loading to the battery that awaits measuring.

Preferably, the clamping part comprises a first clamping plate and a second clamping plate which are arranged at intervals, the battery to be tested is located between the first clamping plate and the second clamping plate, the driving mechanism sequentially penetrates through the first clamping plate and the second clamping plate and is connected with the detecting mechanism, and the constant temperature assembly is respectively arranged on the first clamping plate and the second clamping plate.

In this scheme, the interval sets up between first grip block and the second grip block, the battery that awaits measuring is located between first grip block and the second grip block, actuating mechanism passes first grip block and second grip block in proper order, and actuating mechanism's one end is connected detection mechanism, keep the interval between first grip block and the second grip block through actuating mechanism, be close to first grip block or second grip block through actuating mechanism drive detection mechanism in order to realize the clamp of battery to await measuring, clamping force when simultaneously detection mechanism can also detect the clamp of pressing from both sides tight battery to await measuring, this clamping force numerical value is used for evaluating the index of this battery to await measuring, constant temperature assembly sets up respectively on grip block and second grip block, so that the battery to await measuring keeps the temperature invariable when exerting clamping force and carrying out the test in the periphery side of battery to await measuring, avoid the local high temperature of battery to await measuring and influence the accuracy of test data.

Preferably, the clamping part further comprises a limiting block, the limiting block is arranged on the outer peripheral side of the battery to be tested, and the limiting block is located between the first clamping plate and the second clamping plate and the driving mechanism penetrates through the limiting block.

In this scheme, still be provided with the stopper between first grip block and the second grip block, the stopper is provided with the contact surface equally, and the setting direction of stopper is different with first grip block and second grip block, the stopper is used for restricting the position of the battery that awaits measuring in the both sides in the centre gripping space between first grip block and the second grip block to the stopper also is connected with actuating mechanism, and actuating mechanism keeps the stopper in the position between first grip block and the second grip block, prevents to await measuring the battery and moves along the setting direction of stopper.

Preferably, the material of stopper is plastics.

In this scheme, the stopper selects plastics, and the cost is lower and the machine-shaping is more convenient on the one hand, and on the other hand thermal-insulated performance of plastics is excellent, when testing the battery that awaits measuring, reduces the temperature to the lateral part of the battery that awaits measuring in this direction through the constant temperature component on first grip block and the second grip block, and insulates against heat through the stopper in the stopper setting direction, and then makes the surface temperature of the battery that awaits measuring remain invariable throughout.

Preferably, the limiting block further comprises a temperature measuring component, and the temperature measuring component is located at one side, close to the battery to be tested, of the limiting block.

In the scheme, the temperature measuring assembly is arranged on the limiting block and is used for measuring the temperature of the outer surface of the battery to be measured, so that the constant temperature assembly can be connected and constant temperature control can be carried out on the battery to be measured according to the temperature tested by the temperature measuring assembly.

Preferably, the temperature measuring assembly comprises a temperature sensing line and a temperature acquisition module, one side of the limiting block, which is close to the battery to be measured, is provided with a mounting groove and a mounting hole communicated with the mounting groove, and the temperature sensing line is positioned in the mounting groove, and one end of the temperature sensing line extends out of the mounting hole and is electrically connected with the temperature acquisition module.

In this scheme, the temperature sensing line is used for gathering the temperature of the surface of battery that awaits measuring, and temperature acquisition module is used for analyzing the temperature numerical value that the temperature sensing line gathered, and the temperature sensing line passes through the mounting groove that sets up on the stopper and contacts with the battery that awaits measuring, and the mounting groove makes the temperature sensing line can not outstanding in the contact surface of stopper, guarantees to press from both sides tight battery that awaits measuring when avoiding the fish tail battery that awaits measuring.

Preferably, the detecting mechanism further comprises a third clamping plate, one end of the pressure sensor is connected with the third clamping plate, the second end of the driving mechanism is connected with the third clamping plate, the driving mechanism comprises a connecting rod which sequentially penetrates through the clamping part and the detecting mechanism, and the end of the connecting rod, which extends out of the clamping part, is in threaded connection with a nut.

In this scheme, the third grip block is connected with actuating mechanism, and pressure sensor is located between first grip block and the third grip block, or pressure sensor is located between second grip block and the third grip block, drives the third grip block through actuating mechanism and is close to first grip block or second grip block in order to realize applying stress to the battery to be measured, and first grip block and second grip block still keep pressing from both sides tight battery to be measured simultaneously, and its simple structure sets up conveniently and the cost is lower, and the clamping effect of clamping part is good and the numerical value of applying stress through the pressure sensor feedback is accurate. The mode through the spiro union makes the application stress more accurate, and its application scope is wider to the battery that awaits measuring, can be applicable to different tests.

Preferably, the test fixture further comprises heat insulation pieces, wherein the heat insulation pieces are located on two sides of the clamping part, and the driving mechanism penetrates through the heat insulation pieces.

In this scheme, through setting up the heat insulating part and keeping the temperature of the battery that awaits measuring invariable, stopper and heat insulating part mutually support and prevent that the temperature of the battery that awaits measuring from appearing changing in the test process, avoid influencing test data.

The utility model has the positive progress effects that: the clamping part is arranged to clamp the battery to be tested, and comprises a contact surface matched with the shape of the battery to be tested, the contact surface is used for limiting the position of the battery to be tested in the clamping part after being contacted with the outer surface of the battery to be tested, so that the influence of loosening, shifting and the like of the battery to be tested in the clamping process or the stress applying process is avoided. In addition, the constant temperature assembly is also arranged, and the constant temperature assembly is used for keeping the temperature of the battery to be tested constant all the time so as to ensure that the temperature of the battery to be tested is unchanged when stress is applied and capacity attenuation test is carried out, and avoid the influence of temperature rise on the test data and the test result of the battery to be tested.

Drawings

FIG. 1 is a perspective view of a test fixture according to an embodiment of the utility model.

FIG. 2 is a side view of a test fixture according to one embodiment of the present utility model.

Fig. 3 is a top view of a first clamping plate according to an embodiment of the utility model.

Fig. 4 is a cross-sectional view A-A of fig. 3.

Fig. 5 is a perspective view of a stopper according to an embodiment of the utility model.

Reference numerals illustrate:

clamping part 1

Contact surface 11

First clamping plate 100

Second clamping plate 101

Constant temperature component 2

Water cooling pipe 21

And circulation pipe 22

Detection mechanism 3

Pressure sensor 31

Third clamping plate 32

Drive mechanism 4

Connecting rod 41

Limiting block 5

Through hole 51

Temperature measuring assembly 6

Mounting groove 61

Mounting holes 62

Thermal insulation 7

Detailed Description

The utility model will now be more fully described by way of example only and with reference to the accompanying drawings, but the utility model is not thereby limited to the scope of the examples described.

The embodiment provides a test fixture, the specific structure is shown in fig. 1 and 2, the test fixture is specifically structured as shown in fig. 1 and 2, the clamping portion 1 is provided with a contact surface 11, the contact surface 11 is used for contacting a battery to be tested, the shape of the contact surface 11 is matched with the shape of the outer surface of the battery to be tested, the contact surface 11 matched with the outer surface of the battery to be tested is arranged to enable the clamping portion 1 to clamp the battery to be tested, the contact area is larger, the clamping portion 1 clamps the battery to be tested and limits the battery to be tested, meanwhile, the test fixture also comprises a constant temperature component 2, the constant temperature component 2 is arranged close to the contact surface 11, the constant temperature component 2 is used for maintaining the temperature of the outer surface of the battery to be tested, so that when the capacity attenuation and expansion force data analysis are carried out, the temperature rise of the battery to be tested in the charging and discharging process is controlled, and the control logic in the prior art is adopted for controlling. The positive electrode and the negative electrode of the battery to be tested in the capacity attenuation test are respectively connected with the positive electrode and the negative electrode of the charging and discharging motor, the battery to be tested keeps the initial temperature through the constant temperature component 2, the fact that the actually measured capacity attenuation is not data in a constant temperature state is avoided, the capacity attenuation model or the expansion force service life model is inaccurate, and therefore accuracy of test data and test efficiency of the battery to be tested are improved correspondingly.

Further, as shown in fig. 3 and 4, the constant temperature component 2 includes a water cooling pipe 21 and a circulation pipe 22, the water cooling pipe 21 is disposed in the clamping portion 1 and is disposed near the contact surface 11, a rectangular accommodating area for accommodating the water cooling pipe 21 is disposed in the clamping portion 1, the water cooling pipe 21 laid in the rectangular accommodating area is arranged in a serpentine shape and fills the rectangular accommodating area, the circulation pipe 22 is disposed at two sides of the clamping portion 1 and the side of the circulation pipe 22 is connected with the side of the clamping portion 1, two ends of the water cooling pipe 21 are respectively communicated with the circulation pipe 22 at two sides of the clamping portion 1, the end of the water cooling pipe 21 is disposed in the junction of the circulation pipe 22 and the clamping portion 1, the circulation pipe 21 and the circulation pipe 22 at two sides of the clamping portion 1 form a circulation loop, and the end of the circulation pipe 22 is connected with a water cooling machine, so that the water cooling machine drives a constant temperature medium to flow into the water cooling pipe 21 from the circulation pipe 22 at one side of the clamping portion 1, and flows back to the water cooling machine from the end of the water cooling pipe 21 to the circulation pipe 22 at the other side of the clamping portion 1, so as to realize constant temperature control of the contact surface 11 near the water cooling pipe 21, and thus keeping constant temperature to be measured with the battery 11 contacting the contact surface. Wherein, the constant temperature medium can be water or other heat absorbing fluid.

In other embodiments of the present embodiment, two water cooling pipes 21 are provided, two water cooling pipes 21 are arranged in a rectangular accommodating area close to the contact surface 11 side by side, a circulation pipe 22 is arranged at two sides of the clamping part 1, first ends of the two water cooling pipes 21 are connected with the circulation pipe 22 at one side of the clamping part 1, second ends of the two water cooling pipes 21 are connected with the circulation pipe 22 at the other side of the clamping part 1, and a constant temperature medium is circulated in the water cooling pipes 21 and the circulation pipe 22 through a water cooling machine, so that the number of the water cooling pipes 21 is increased to avoid the situation that the temperature of the battery to be measured is not constantly controlled due to the fact that the temperature of the single water cooling pipe 21 is heated by the contact surface 11 and the battery to be measured continuously increases, the temperature constant effect of the constant temperature assembly 2 is improved, and the temperature of the battery to be measured in contact with the contact surface 11 is kept constant.

In another embodiment, the constant temperature assembly 2 can also adopt a heating film in the prior art for constant temperature control, the heating film is preferably a self-constant temperature heating film, the self-constant temperature heating film is arranged on the clamping part 1 and is close to the contact surface 11, and the temperature of the outer surface of the battery to be tested is kept constant by switching on the self-constant temperature heating film, so that the temperature rise of the battery to be tested in the test process can be controlled.

In other embodiments, the temperature of the outer periphery side of the battery to be tested can be kept constant by controlling the environmental temperature during testing, that is, the indoor temperature of the battery to be tested in the testing process can be controlled, and an air conditioner, a fan or other devices for keeping the environmental temperature constant in the prior art can be adopted in a specific manner, so that when the battery to be tested is tested in a certain space, the indoor environmental temperature of the outer periphery side of the test fixture and the battery to be tested is kept constant, and then the heat of the outer surface of the battery to be tested is absorbed by the indoor lower environmental temperature during heating, so that the constant temperature control of the battery to be tested in the testing process is realized. Of course, the temperature control can also be matched with the constant temperature component 2 in the clamp to be tested together through the environmental temperature control, so that the temperature rise of the battery to be tested in the test process is further improved.

As shown in fig. 1 and 2, the test fixture in this embodiment further includes a detection mechanism 3 and a driving mechanism 4, the detection mechanism includes a pressure sensor 31, a first end of the driving mechanism 4 is connected to the clamping portion 1, a second end of the driving mechanism 4 is connected to the detection mechanism 3, when the test fixture detects, the driving mechanism 4 drives an end portion of the pressure sensor 31 of the detection mechanism 3 to abut against the clamping portion 1, the pressure sensor 31 is used for detecting a stress applied to the clamping portion 1 by the driving mechanism 4, the stress is transferred to the battery to be tested through the contact surface 11 and realizes clamping of the battery to be tested, the battery to be tested bears the stress and performs charging and discharging detection, and further, testing of a relationship between capacity fading and expansion force of the battery to be tested under the stress is realized, after the test fixture finishes detection, the driving mechanism 4 drives the detection mechanism 3 to be far away from the clamping portion 1 and enables the pressure sensor 31 to cancel surface stress loading of the battery to be tested, and at this time, the clamping portion 1 does not clamp the battery to be tested, and the battery to be tested can be used for replacing the battery to be tested for performing repeated test in this state, thereby improving the reuse rate of the test fixture.

The clamping portion 1 includes a first clamping plate 100 and a second clamping plate 101 that are disposed at intervals, where the first clamping plate 100 and the second clamping plate 101 are rectangular aluminum plates, the first clamping plate 100 and the second clamping plate 101 are disposed at intervals, counter sunk holes for penetrating the driving mechanism 4 are disposed at each corner of the first clamping plate 100 and the second clamping plate 101, the driving mechanism 4 sequentially penetrates each corner of the first clamping plate 100 and the second clamping plate 101, so that the first clamping plate 100 and the second clamping plate 101 realize positioning along the penetrating direction of the driving mechanism 4, the battery to be tested is located between the first clamping plate 100 and the second clamping plate 101, correspondingly, the contact surface 11 and the constant temperature component 2 are also disposed on one side of the first clamping plate 100 and one side of the second clamping plate 101 corresponding to the battery to be tested, the detecting mechanism 3 may be disposed on one side of the first clamping plate 100, and of course the detecting mechanism 3 may also be disposed on one side of the second clamping plate 101.

Specifically, the second clamping plate 101 is arranged at intervals with the detection mechanism 3, the end part of the driving mechanism 4 extending out of the second clamping plate 101 is connected with the detection mechanism 3, the pressure sensor 31 is positioned between the detection mechanism 3 and the second clamping plate 101, the end part of the pressure sensor 31 is abutted against the second clamping plate 101, the first clamping plate 100 and the second clamping plate 101 are connected through the driving mechanism 4, the driving mechanism 4 drives the detection mechanism 3 to move along the penetrating direction of the driving mechanism 4 and to be close to the second clamping plate 101, the pressure sensor 31 is abutted against the second clamping plate 101, the second clamping plate 101 is close to the first clamping plate 100, meanwhile, a battery to be detected clamped between the second clamping plate 101 and the first clamping plate 100 is clamped under the movement of the pressure sensor 31, the pressure sensor 31 applies stress to the first clamping plate 100 and the second clamping plate 101 and finally transmits the stress to the battery to be tested, so that the stress loading of the battery to be tested is realized, the pressure sensor 31 is connected with a stress detection acquisition system in the prior art and detects the clamping force when clamping the battery to be tested, the clamping force value is used for evaluating the index of the battery to be tested, the water cooling pipes 21 of the constant temperature assembly 2 arranged on the first clamping plate 100 and the second clamping plate 101 perform temperature control on the side surfaces of the first clamping plate 100 and the second clamping plate 101, which are contacted with the battery to be tested, so that the temperature of the periphery side of the battery to be tested is kept constant when the clamping force is applied and the capacity fading test is performed, and the accuracy of test data is prevented from being influenced by the local temperature of the battery to be tested.

In addition, as shown in fig. 1 and 5, the clamping portion 1 further includes a limiting block 5, the limiting block 5 is a rectangular block, the limiting block 5 is provided with two limiting blocks 5 and is also provided with a contact surface 11, the contact surface 11 is an arc surface and is adapted to a cylindrical battery to be tested, the two limiting blocks 5 are arranged between the first clamping plate 100 and the second clamping plate 101 and are arranged on two sides of the battery to be tested along the direction perpendicular to the driving mechanism 4, and the two limiting blocks 5 are matched with the first clamping plate 100 and the second clamping plate 101 together to clamp the outer surface of the battery to be tested, so that effective clamping of the battery to be tested is achieved. The through holes 51 are formed in the two limiting blocks 5, the through holes 51 are used for allowing the driving mechanism 4 to penetrate, specifically, the end portions of the driving mechanism 4 sequentially penetrate through the first clamping plate 100, the limiting blocks 5, the second clamping plate 101 and the detecting mechanism 3, the limiting blocks 5 are limited through the driving mechanism 4 to prevent the first clamping plate 100 and the second clamping plate 101 from loosening when the battery to be detected is clamped, meanwhile, the limiting blocks 5 are limited in the setting direction of the limiting blocks 5 after being positioned, the battery to be detected is limited when the stress is large, the battery to be detected is prevented from being shifted out of the testing fixture, and the testing stability of the battery to be detected is improved.

Meanwhile, the material of the limiting block 5 is plastic, so that the temperature of the battery to be tested is effectively controlled for testing and clamping, namely, the temperature is constantly controlled, on one hand, the cost of the limiting block 5 made of plastic is lower, the processing and forming are more convenient, on the other hand, the heat insulation performance of plastic is excellent, when the battery to be tested is tested, the side part of the battery to be tested in the direction is cooled through the constant temperature component 2 on the first clamping plate 100 and the second clamping plate 101, and when the constant temperature control is carried out on the peripheral side of the battery to be tested, the temperature is insulated, so that the temperature of the outer surface of the battery to be tested is always kept constant in the testing process, and the temperature of the battery to be tested is prevented from rising in the charging or discharging process, so that the test data is influenced.

In this embodiment, the limiting block 5 further includes a temperature measuring component 6, where the temperature measuring component 6 is located on one side of the limiting block 5 near the battery to be measured, and the temperature measuring component 6 is used to detect the temperature of the outer surface of the battery to be measured and electrically connected to the constant temperature component 2, so that the temperature of the outer surface of the battery to be measured is controlled by the constant temperature component 2 in time when the temperature measuring component 6 detects the temperature rise of the battery to be measured.

The temperature measuring component 6 specifically includes a temperature sensing wire and a temperature collecting module in this embodiment, as shown in fig. 5, a mounting groove 61 is provided on the contact surface 11 of the limiting block 5, the mounting groove 61 is an arc groove, the mounting groove 61 extends around the outer circumferential direction of the battery to be tested, the notch of the mounting groove 61 extends to two sides of the limiting block 5, a mounting hole 62 is provided in the mounting groove 61, the mounting hole 62 penetrates through the limiting block 5, the temperature sensing wire penetrates through the mounting hole 62 and is laid in the mounting groove 61, the temperature sensing wire laid in the mounting groove 61 is bonded with the mounting groove 61, and then the temperature sensing wire does not protrude out of the mounting groove 61, and the other end of the temperature sensing wire extends out of the mounting hole 62 and is electrically connected with the temperature collecting module. The temperature of the outer surface of the battery to be measured is detected through the temperature sensing wire, the temperature value acquired by the temperature sensing wire is analyzed through the temperature acquisition module, the temperature sensing wire is in contact with the battery to be measured through the mounting groove 61 arranged on the limiting block 5, and further the temperature sensing wire cannot protrude out of the contact surface 11 of the limiting block 5, so that the contact surface 11 is ensured to be in full contact with the battery to be measured and effectively clamped, and meanwhile the temperature sensing wire is prevented from protruding out of the contact surface 11 to scratch the battery to be measured.

In other embodiments of the present embodiment, the mounting grooves 61 are provided with a plurality of mounting grooves 61 and are arranged at intervals along the height direction of the limiting block 5, wherein the mounting grooves 61 are respectively arranged along the height direction of the limiting block 5 and near the first end and the second end of the limiting block 5, and correspondingly, the mounting holes 62 and the temperature sensing wires are also provided with a plurality of mounting grooves 61 which are arranged near the first end and the second end of the limiting block 5 and correspond to the first end and the second end of the battery to be tested, so that the temperature change conditions of different areas of the battery to be tested can be tested, the temperature control can be performed through the constant temperature assembly 2 in time, the accurate detection of the temperature of the battery to be tested during the test can be realized by increasing the number of the temperature sensing wires, and the inaccurate test data caused by the condition can be avoided when the battery to be tested is locally heated and the temperature measuring assembly 6 does not detect.

In this embodiment, the detection mechanism 3 further includes a third clamping plate 32, the third clamping plate 32 is a rectangular plate, one end of the pressure sensor 31 is screwed with the third clamping plate 32, the other end of the pressure sensor 31 is abutted against the second clamping plate 101, the driving mechanism 4 sequentially passes through the first clamping plate 100, the limiting block 5, the second clamping plate 101 and the third clamping plate 32, when the driving mechanism 4 drives the third clamping plate 32 to approach the second clamping plate 101, the pressure sensor 31 is abutted against the second clamping plate 101 and makes the second clamping plate 101 approach the first clamping plate 100, meanwhile, the limiting block 5 limits the position of the battery to be tested between the first clamping plate 100 and the second clamping plate 101, the first clamping plate 100, the second clamping plate 101 and the limiting block 5 jointly clamp the battery to be tested, the structure is simple, the setting is convenient, the cost is low, the clamping effect of the clamping portion 1 is good, and the value fed back by the pressure sensor 31 is accurate.

In this embodiment, the driving mechanism 4 includes a connecting rod 41 sequentially passing through the first clamping plate 100, the limiting block 5, the second clamping plate 101 and the third clamping plate 32, the connecting rod 41 is a cylindrical rod, external threads are respectively disposed at two ends of the connecting rod 41, two ends of the connecting rod 41 respectively extend out of the first clamping plate 100 and the third clamping plate 32 and are screwed with nuts, the third clamping plate 32 is driven to be close to the second clamping plate 101 by screwing the nuts, meanwhile, the pressure sensor 31 is abutted to the second clamping plate 101 and drives the second clamping plate 101 to be close to the first clamping plate 100, clamping and stress application of a battery to be tested are achieved, stress application is more accurate by screwing, namely expansion force detection is achieved by the detecting mechanism 3, the temperature of the battery to be tested is kept constant all the time by the constant temperature component 2, especially in charge and discharge test of capacity attenuation of the battery to be tested, the influence of temperature rise on test data is discharged, and test accuracy is improved.

In this embodiment, test fixture still includes insulating part 7, insulating part 7 is the rectangular plate, its material is plastics, insulating part 7 and first grip block 100 and second grip block 101 looks adaptation, and be located one side that the battery that awaits measuring was kept away from to first grip block 100 and second grip block 101, insulating part 7 is used for insulating the heat that awaits measuring battery that awaits measuring on first grip block 100 and the second grip block 101 gives off, avoid the tester to scald because of high temperature in using this test fixture, improve test fixture's safety in utilization, and keep the temperature after the temperature of awaiting measuring battery through constant temperature subassembly 2 cooling through setting up insulating part 7 invariable, stopper 5 and insulating part 7 mutually support and prevent that the temperature of awaiting measuring battery from appearing changing in the test process, avoid ambient temperature to influence the battery that awaits measuring, avoid influencing test data.

In another embodiment, the material of the heat insulating member 7 may be a material with a low thermal conductivity, such as aerogel or PU foam, in the prior art, which is also aimed at insulating heat emitted by the to-be-tested battery on the first clamping plate 100 and the second clamping plate 101, so as to keep the temperature of the external surface of the to-be-tested battery constant and prevent the tester from being scalded.

In other embodiments, the temperature of the battery to be tested may be achieved by keeping the above-mentioned ambient temperature, where the first clamping plate 100 and the second clamping plate 101 are aluminum plates, the first clamping plate 100 and the second clamping plate 101 are used for clamping the battery to be tested, the water cooling tube 21 is disposed in the limiting member 5, the circulating tube 22 is disposed on the peripheral side of the limiting member 5, the water cooling tube 21 and the circulating tube 22 in the limiting member 5 are disposed near the contact surface 11 on the limiting member 5, the heat insulation member 7 is not disposed on one side of the first clamping plate 100 and one side of the second clamping plate 101, and the temperature of the outer surface of the battery to be tested is rapidly emitted to the indoor environment in the test by the material self-heat dissipation property of the first clamping plate 100 and the second clamping plate 101, so that the temperature of the outer surface of the battery to be tested is constant by matching with the water cooling tube 21 in the limiting member 5 in the above-mentioned manner of keeping the ambient temperature.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims

1. The utility model provides a test fixture, its is including clamping part, the clamping part is used for pressing from both sides tight battery that awaits measuring, its characterized in that, in the clamping part with the contact surface that awaits measuring the battery contacted with the shape phase-match of battery that awaits measuring, test fixture still includes constant temperature component, constant temperature component locates the clamping part, just constant temperature component is close to the contact surface sets up.

2. The test fixture of claim 1, wherein the constant temperature assembly comprises a water-cooled tube and a circulation tube, the water-cooled tube is disposed in the clamping portion, the circulation tube is in communication with the water-cooled tube and the circulation tube form a circulation loop for circulating a constant temperature medium, and the circulation tube is disposed on an outer peripheral side of the clamping portion.

3. The test fixture of claim 1, further comprising a detection mechanism comprising a pressure sensor, a detection end of the pressure sensor abutting the clamping portion;

4. The test fixture of claim 3, wherein the clamping portion comprises a first clamping plate and a second clamping plate arranged at intervals, the battery to be tested is located between the first clamping plate and the second clamping plate, the driving mechanism sequentially penetrates through the first clamping plate and the second clamping plate and is connected with the detecting mechanism, and the constant temperature assembly is respectively arranged on the first clamping plate and the second clamping plate.

5. The test fixture of claim 4, wherein the clamping portion further comprises a limiting block, the limiting block is disposed on an outer peripheral side of the battery to be tested, the limiting block is located between the first clamping plate and the second clamping plate, and the driving mechanism passes through the limiting block.

6. The test fixture of claim 5, wherein the stopper is plastic.

7. The test fixture of claim 5, wherein the limit block further comprises a temperature measuring component, the temperature measuring component being located at a side of the limit block adjacent to the battery to be tested.

8. The test fixture of claim 7, wherein the temperature measuring assembly comprises a temperature sensing wire and a temperature acquisition module, a mounting groove and a mounting hole communicated with the mounting groove are formed in one side of the limiting block, which is close to the battery to be tested, and the temperature sensing wire is positioned in the mounting groove, and one end of the temperature sensing wire extends out of the mounting hole and is electrically connected with the temperature acquisition module.

9. The test fixture of claim 3, wherein the detection mechanism further comprises a third clamping plate, one end of the pressure sensor is connected with the third clamping plate, the second end of the driving mechanism is connected with the third clamping plate, the driving mechanism comprises a connecting rod sequentially penetrating through the clamping part and the detection mechanism, and nuts are screwed at the ends of the connecting rod, extending out of the clamping part and the detection mechanism.

10. A test fixture as recited in claim 3, further comprising thermal insulation on both sides of said clamping portion and said drive mechanism passing through said thermal insulation.