Pole piece flexibility testing device

Abstract

The utility model provides a pole piece flexibility testing device, which relates to the technical field of pole piece testing, and comprises a pole piece fixing piece, a pole piece to be tested is fixed in the pole piece fixing piece, and a pressure sensor is arranged in the pole piece fixing piece; the pressing rod slides in a guide groove formed in one side of the pole piece fixing piece so as to bend the pole piece to be tested. The device has the beneficial effects that the standardization of the flexibility test of the pole piece is realized, the subjectivity and uncertainty caused by manual operation are reduced, the stress data of the pole piece in the pressed process can be accurately acquired in real time, and the quantitative evaluation of the flexibility of the pole piece is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pole piece test, especially to a pole piece flexibility testing device. BACKGROUND

[0002] The pole piece flexibility of lithium battery is one of the key indicators to measure the processing performance of battery, which has the dual functions of feedback and verification. On the one hand, the flexibility of pole piece is affected by multiple production links such as raw material characteristics, coating process, rolling process, baking, etc. On the other hand, different manufacturing processes, winding processes and cell types also have different requirements for the flexibility of pole piece. Especially in the production of cylindrical lithium ion battery, due to the high automation of pole piece manufacturing and cell winding process, it puts forward more strict requirements for the flexibility of pole piece. However, the current pole piece flexibility detection method mostly relies on manual bending and winding method, which has strong subjectivity, non-standard test process and is easily affected by many factors, resulting in large uncertainty of detection results, difficult to form unified quantitative standard, and further difficult to accurately evaluate the quality of pole piece, which hinders the further improvement of lithium ion battery quality. SUMMARY

[0003] In view of the problems existing in the prior art, the utility model provides a pole piece flexibility testing device, which comprises:

[0004] A pole piece fixing member is provided with a pole piece to be tested, and a pressure sensor is arranged in the pole piece fixing member.

[0005] A pressing rod is arranged in a guide groove on one side of the pole piece fixing member to bend the pole piece to be tested.

[0006] Preferably, the pole piece fixing member comprises two sliding members arranged oppositely.

[0007] Each sliding member comprises a sliding rod, both ends of the sliding rod are respectively provided with a sliding rail in sliding connection with the sliding rod, and the contact surface of the sliding rod and the sliding rail is provided with the pressure sensor.

[0008] Both ends of the pole piece to be tested are fixed on two sliding rods arranged oppositely.

[0009] Preferably, the pressing rod is located between the two sliding members.

[0010] Preferably, the pole piece fixing member further comprises:

[0011] A base, and each sliding rail is fixed on the base through a lifting rod.

[0012] Preferably, a plurality of sliding grooves are further arranged on the base, each of the sliding grooves corresponding to one of the lifting rods, and the bottom of each of the lifting rods is in sliding connection with the corresponding sliding groove.

[0013] Preferably, each of the sliding rods slides horizontally in the corresponding sliding rail towards another sliding rod to adjust the distance between the two ends of the test electrode.

[0014] Preferably, the sliding rail is lifted in the vertical direction by the lifting rod.

[0015] Preferably, the bottom of each of the lifting rods slides horizontally in the corresponding sliding groove towards another lifting rod to adjust the distance between the two ends of the test electrode.

[0016] Preferably, a motor is further arranged in the guide groove to drive the pressing rod to slide.

[0017] Preferably, the pressing rod slides in the vertical direction in the guide groove.

[0018] The above technical solution has the following advantages or beneficial effects:

[0019] 1. By the fixed electrode fixing member and the pressing rod structure, and the guidance of the guide groove, the standardization of the electrode flexibility test is realized, and the subjectivity and uncertainty caused by human operation are reduced.

[0020] 2. Since the pressure sensor is directly arranged on the contact surface between the test electrode and the electrode fixing member, the stress data of the electrode during the pressure process can be collected in real time and accurately, and the quantitative evaluation of the electrode flexibility is realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 In a preferred embodiment of the present application, a top view of an electrode flexibility test device is provided.

[0022] Figure 2 In a preferred embodiment of the present application, a front view of an electrode flexibility test device is provided.

[0023] Figure 3 In a preferred embodiment of the present application, a stress analysis diagram is provided.

[0024] Figure 4 In a preferred embodiment of the present application, a curve diagram of the pressing rod sliding distance and the pressure value is provided. DETAILED DESCRIPTION

[0025] The present application will be described in detail below with reference to the drawings and specific embodiments. The present application is not limited to this embodiment, and other embodiments can also belong to the scope of the present application as long as they comply with the spirit of the present application.

[0026] The preferred embodiment of the utility model discloses, based on the above problems existing in prior art, now provide a kind of pole piece flexibility test device, as shown in Fig. Figure 1 Including:

[0027] Pole piece fixing part 1, pole piece fixing part 1 is fixed with the pole piece 2 to be tested, and pressure sensor is equipped in pole piece fixing part 1;

[0028] Pressing rod 3, pressing rod is slid in guide groove 4 located in one side of pole piece fixing part 1 to press bend the pole piece 2 to be tested.

[0029] Specifically, the embodiment provides a kind of pole piece flexibility test device, which realizes the standardization of pole piece flexibility test by fixed pole piece fixing part 1 and pressing rod 3 structure and the guidance of guide groove 4.In the test process, pressing rod 3 is slid in guide groove 4 to press bend the pole piece to be tested, and this action is controllable and repeatable, and the sliding distance of pressing rod 3 in guide groove 4 can also be measured explicitly, to reduce the subjectivity and uncertainty brought by artificial operation.Meanwhile, since pressure sensor is directly arranged on the contact surface of the pole piece 2 to be tested and pole piece fixing part 1, stress data of pole piece in the process of being pressed can be collected in real time and accurately, to realize the quantitative evaluation of pole piece flexibility.

[0030] The pressure sensor in the device can monitor the stress change of the pole piece in the process of being pressed in real time, so that the moment of bending or breaking of the pole piece (i.e. the moment of sudden change of pressure) can be accurately judged, and the maximum stress received at this time is recorded.The ability of real-time monitoring and accurate judgment greatly improves the accuracy and reliability of the test.

[0031] Further, the structure of the device is relatively simple, easy to operate and maintain.The device can be easily disassembled and cleaned for the next test, and has wider applicability in practical application.

[0032] In a preferred embodiment of the present embodiment, the pole piece fixing part 1 includes two sliding members 10 arranged oppositely;Each of the sliding members 10 includes a slide rod 11, both ends of the slide rod 11 are respectively provided with a slide rail 12 connected with the slide rod 11, and the contact surface of the slide rod 11 and the slide rail 12 is provided with the pressure sensor;

[0033] Both ends of the pole piece 2 to be tested are respectively fixed on the two slide rods 11 arranged oppositely.

[0034] In a preferred embodiment of the present embodiment, the pressing rod 3 is located between the two sliding members 10.

[0035] Specifically, in the embodiment, as shown in Figure 1As shown, the pressure rod 2 is located between the two slide rails 12, and when the pressure rod 3 exerts pressure on the test electrode 2, the electrode 2 will be bent, and the slide rods 11 at both ends of the electrode 2 will slide along the slide rails 12 to the middle.

[0036] The force analysis diagram is shown in Figure 3 As shown, the pressure rod 3 is located above the midpoint of the test electrode 2, and further according to the drawing, it can be deduced that:

[0037] Fapp1=Fpull1*sinθ(0°<θ<90°)

[0038] Fpull1=Fpress*cos(90°-θ)

[0039] Fapp2 and Fpull2 can be deduced in the same way

[0040] Finally, we get:

[0041] Ftotal=Fapp1+Fapp2=2*Fpull1*sinθ=2Fpress*cos(90°-θ)*sinθ(0°<θ<90°), Fapp1 and Fapp2 are the pressure values detected by the pressure sensors arranged on the two slide rails 12 respectively;

[0042] As shown by the curve in Figure 4 , the pressure value of Ftotal will gradually increase with the sliding distance X of the pressure rod 3, but due to the internal force Fextension generated by the bending of the electrode 2 opposite to Fpress, the value of Ftotal increases slowly, but when the electrode reaches its limit, force leakage will occur, that is, the electrode will break, at this time the curve drawing appears a turning point, Ftotal increases sharply, so that the flexibility of the electrode 2 can be judged by the sliding distance of the pressure rod 3.

[0043] Therefore, by testing the test electrode through the cooperation of the electrode fixing member and the pressure rod in this embodiment, the value of the pressure sensor can accurately judge the flexibility of the electrode.

[0044] In a preferred embodiment of the present application, the electrode fixing member 1 further comprises:

[0045] The base 13, and each slide rail 12 is fixed to the base 13 by a lifting rod 14.

[0046] In a preferred embodiment of the present application, the base 13 is further provided with a plurality of sliding grooves, each sliding groove corresponds to a lifting rod 14, and the bottom of the lifting rod 14 is in sliding connection with the corresponding sliding groove.

[0047] Specifically, in the above embodiments, the height of the slide rail 12 can be adjusted by the lifting rod 14, and the distance between the two slide rails 12 can be adjusted by the lifting rod 14 sliding in the sliding groove, so that the electrode flexibility testing device provided by this utility model can be applied to the flexibility testing of more different types of electrodes.

[0048] In a preferred embodiment, each of the slide bars 11 slides horizontally toward another slide member 10 in the corresponding slide rail 12 to adjust the spacing between the two ends of the electrode to be tested 2.

[0049] In a preferred embodiment, the slide rail 12 is raised and lowered vertically via the lifting rod 14.

[0050] In a preferred embodiment, the bottom of the lifting rod 14 slides horizontally toward the other slider 10 in the corresponding sliding groove to adjust the distance between the two ends of the electrode 2 to be tested.

[0051] In a preferred embodiment, the pressure rod 3 slides vertically in the guide groove 4.

[0052] Specifically, such as Figure 2 As shown, although the electrode is relatively light, its weight can still affect its deformation when the electrode is long. In the above embodiment, the sliding direction of the pressure rod is set to vertical (in the same direction as gravity), and correspondingly, the sliding direction of the slide rod in the slide rail is set to horizontal (perpendicular to gravity). This ensures that the lowest point of deformation caused by gravity is located at the midpoint of the electrode, always at the same point as the contact point between the pressure rod and the electrode, thus reducing the influence of gravity on the testing process. The aforementioned sliding and lifting directions are... Figure 2 It is indicated by an arrow.

[0053] In a preferred embodiment, the guide groove 4 is further provided with a motor for driving the pressure rod 3 to slide.

[0054] Specifically, in this embodiment, the pressure rod 3 is driven by a motor to slide within the guide groove 4, which allows for more precise control of the sliding distance of the pressure rod, ensuring the test accuracy and repeatability of the flexibility test.

[0055] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. A pole piece flexibility testing device characterized by, The application relates to a test device for testing a pole piece. The test device comprises: a pole piece fixing member in which a pole piece to be tested is fixed, and a pressure sensor arranged in the pole piece fixing member; 2. The pole piece flexibility testing device of claim 1, wherein, a pressing rod which slides in a guide groove arranged on one side of the pole piece fixing member to press and bend the pole piece to be tested. The pole piece fixing member comprises two sliding members arranged oppositely. Each sliding member comprises a sliding rod, two ends of the sliding rod are respectively provided with sliding rails in sliding connection with the sliding rod, and the contact surface of the sliding rod and the sliding rails is provided with the pressure sensor.

3. The pole piece flexibility testing apparatus of claim 2, wherein, Two ends of the pole piece to be tested are respectively fixed on two sliding rods arranged oppositely.

4. The pole piece flexibility testing apparatus of claim 2, wherein, The pressing rod is located between the two sliding members. The pole piece fixing member further comprises:

5. The pole piece flexibility testing apparatus of claim 4, wherein, a base, and each sliding rail is fixed on the base through a lifting rod.

6. The pole piece flexibility testing apparatus of claim 2, wherein, A plurality of sliding grooves are further arranged on the base, each sliding groove corresponds to one lifting rod, and the bottom of the lifting rod is in sliding connection with the sliding groove.

7. The pole piece flexibility testing apparatus of claim 4, wherein, Each sliding rod slides horizontally in the corresponding sliding rail towards the other sliding member to adjust the distance between the two ends of the pole piece to be tested.

8. The pole piece flexibility testing apparatus of claim 5, wherein, The sliding rail is lifted along the vertical direction through the lifting rod.

9. The pole piece flexibility testing apparatus of claim 1, wherein, The bottom of each lifting rod slides horizontally in the corresponding sliding groove towards the other sliding member to adjust the distance between the two ends of the pole piece to be tested.

10. The pole piece flexibility testing apparatus of claim 1, wherein, A motor is further arranged in the guide groove to drive the pressing rod to slide. The pressing rod slides along the vertical direction in the guide groove.

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