Top cover test fixture

Abstract

The utility model discloses a top cover test fixture. The top cover test fixture comprises a fixture upper cover and a fixture lower cover which are sequentially arranged from top to bottom, a first area for accommodating a battery cell top cover is arranged in the clamp lower cover; the clamp upper cover and the clamp lower cover are arranged from top to bottom to form a spatial layer, a first area of the clamp lower cover is used for accommodating a battery cell top cover, a second area of the clamp upper cover is used for passing through a pole upper section, and the length and the width of the second area of the clamp upper cover are smaller than those of the battery cell top cover, so that a physical limiting boundary is formed at the edge of the clamp upper cover; the electric core top cover can be fixed and limited during the drawing test, the electric core top cover is ensured not to be influenced by the drawing test to generate displacement and cause test deviation during the test, the test result difference caused by the manual test method is further reduced, and the accuracy and repeatability of the test data are improved. In addition, the top cover test fixture is simple in overall structural design, easy to process and suitable for batch production.

Description

Technical Field

[0001] This utility model belongs to the field of battery safety performance testing technology, specifically relating to a top cover test fixture. Background Technology

[0002] Currently, there is no unified standard method for performance testing of battery cell top covers. In practice, actual dummy cells are typically used. While this method lacks specific testing standards, it is widely adopted because it closely resembles real-world usage. However, this approach not only increases the complexity of the experiment but also reduces the accuracy of the experimental data. In testing individual top covers, the varying operating habits of experimenters and the complexity of the fixture design when using limiting clamps to fix the top cover make it difficult to improve the difficulty and accuracy of the test. Therefore, there is an urgent need to optimize the testing methods and fixture design. Utility Model Content

[0003] This invention provides a top cover test fixture to reduce test result deviations caused by differences in human testing methods.

[0004] This utility model provides a top cover testing fixture, including:

[0005] The clamp upper cover and clamp lower cover are arranged sequentially from top to bottom, and the clamp upper cover is detachably installed on the clamp lower cover;

[0006] The lower cover of the clamp has a first area for accommodating the top cover of the battery cell;

[0007] The clamp cover has a second area inside, which is used to expose the upper part of the electrode post of the battery cell top cover;

[0008] The upper and lower covers of the clamp are used to fix the top cover of the battery cell.

[0009] Furthermore, the first region includes a first slot segment and a second slot segment arranged sequentially from top to bottom. The first slot segment is used to accommodate the top cover of the battery cell, and the second slot segment is used to accommodate the lower section of the electrode post of the top cover of the battery cell.

[0010] Furthermore, the width of the first slot segment is the same as the width of the top cover of the battery cell;

[0011] The length of the first slot segment is the same as the length of the top cover of the battery cell;

[0012] The height of the first slot is the same as the thickness of the top cover of the battery cell.

[0013] Furthermore, the difference between the width of the first slot segment and the width of the top cover of the battery cell is 0.5-0.8 mm;

[0014] The difference between the length of the first slot segment and the length of the top cover of the battery cell is 0.5-0.8 mm;

[0015] The difference between the height of the first groove segment and the thickness of the top cover of the battery cell is greater than or equal to 0.3 mm.

[0016] Furthermore, the second groove segment needs to maintain a predetermined distance from the lower segment of the pole post.

[0017] Furthermore, the second region needs to expose the upper section of the pole post and maintain a predetermined distance from the upper section of the pole post.

[0018] Furthermore, when the upper cover and the lower cover of the clamp fix the top cover of the battery cell, the protruding part of the upper section of the electrode post is at least 0.3 mm higher than the surface of the upper cover of the clamp.

[0019] Furthermore, the length of the upper cover of the clamp is equal to the length of the lower cover of the clamp, and the width of the upper cover of the clamp is equal to the width of the lower cover of the clamp;

[0020] The difference between the length of the lower cover of the clamp and the length of the first groove segment is equal to the difference between the width of the lower cover of the clamp and the width of the first groove segment.

[0021] The difference between the length of the clamp cover and the length of the second region is equal to the difference between the width of the clamp cover and the width of the second region.

[0022] Furthermore, both the upper cover and the lower cover of the clamp are provided with multiple threaded holes on their periphery, and the upper cover and the lower cover of the clamp are connected by screws or bolts.

[0023] Furthermore, the threaded holes are evenly distributed around the outer periphery of the upper cover and the lower cover of the fixture.

[0024] Compared with the prior art, the present invention has at least the following technical effects:

[0025] In this invention, the upper and lower covers of the fixture are arranged from top to bottom to form a spatial layer. The first area of ​​the lower cover is used to accommodate the top cover of the battery cell, and the second area of ​​the upper cover is used for the passage of the upper section of the electrode post. The length and width of the second area of ​​the upper cover are smaller than the length and width of the top cover of the battery cell, thus forming a physical limiting boundary at the edge of the upper cover. During the pull-out test, this effectively fixes and limits the top cover of the battery cell, ensuring that it will not be displaced due to the pull-out test and cause test deviation. This further reduces the difference in test results caused by manual testing methods and improves the accuracy and repeatability of test data. In addition, the overall structure of this top cover test fixture is simple and easy to manufacture, making it suitable for mass production. Attached Figure Description

[0026] Figure 1 This is a simplified structural diagram of the top cover test fixture in one embodiment of the present invention;

[0027] Figure 2 This is a top view of the lower cover of the clamp in one embodiment of the present invention;

[0028] Figure 3 This is a side view of the lower cover of the clamp in one embodiment of the present invention;

[0029] Figure 4 This is a top view of the clamp cover in one embodiment of the present invention;

[0030] Figure 5 This is a side view of the clamp cover in one embodiment of the present invention;

[0031] Figure 6 This is a test diagram of the top cover of the battery cell in one embodiment of this utility model;

[0032] Figure 7 This is a top view of the battery cell top cover in one embodiment of the present invention. Detailed Implementation

[0033] The following description, in conjunction with schematic diagrams, illustrates a top cover testing fixture of the present invention, which represents a preferred embodiment. It should be understood that those skilled in the art can modify the present invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the scope of the present invention.

[0034] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0035] Please refer to Figures 1-7 This embodiment discloses a top cover testing fixture, specifically, the top cover testing fixture includes:

[0036] The clamp upper cover 2 and clamp lower cover 1 are arranged sequentially from top to bottom. The clamp upper cover 2 is detachably mounted on the clamp lower cover 1. The clamp lower cover 1 has a first area for accommodating the battery cell top cover 4. The clamp upper cover 2 has a second area 7 for exposing the upper part of the terminal post of the battery cell top cover 4. The clamp upper cover 2 and clamp lower cover 1 cooperate to fix the battery cell top cover 4.

[0037] In this invention, the upper cover 2 and lower cover 1 of the fixture are arranged from top to bottom to form a spatial layer. The first area of ​​the lower cover 1 is used to accommodate the top cover 4 of the battery cell, and the second area of ​​the upper cover 2 is used to pass through the upper section of the electrode post. The length and width of the second area 7 of the upper cover 2 are both smaller than the length and width of the top cover 4 of the battery cell, thereby forming a physical limiting boundary at the edge of the upper cover 2. During the pull-out test, this can fix and limit the top cover 4 of the battery cell, ensuring that the top cover 4 of the battery cell will not be displaced due to the pull-out test and cause test deviation. This further reduces the difference in test results caused by the use of manual testing methods and improves the accuracy and repeatability of test data. In addition, the overall structure of this top cover test fixture is simple and easy to manufacture, making it suitable for mass production.

[0038] Please refer to Figure 3 and Figure 6 In this embodiment, the first region includes a first groove segment 6 and a second groove segment 5 arranged sequentially from top to bottom. The first groove segment 6 is used to accommodate the top cover 4 of the battery cell, and the second groove segment 5 is used to accommodate the terminal post of the top cover 4 of the battery cell.

[0039] In specific pull-out tests, the cell top cover 4 may undergo elastic or plastic deformation, including local bulging, edge warping, or overall deformation. The space between the upper cover 2 and the lower cover 1 of the fixture for placing the cell top cover 4, as well as the size of the second region 7, needs to be able to accommodate both the cell top cover 4 before deformation and the cell top cover 4 after deformation. Therefore, the length, width, and height of the first groove segment 6 should be greater than the length, width, and height of the cell top cover 4, respectively.

[0040] Furthermore, the space between the upper cover 2 and the lower cover 1 of the clamp for placing the cell top cover 4 should not be too large. If the space is too large, the cell top cover 4 may shake during the pulling process, resulting in unstable pulling force measurements and affecting the accuracy of the test results. If the space is too small, it will be difficult to accommodate the cell top cover 4 after deformation and expansion. Therefore, the size of the space, i.e., the first slot section 6, needs to be set reasonably.

[0041] Please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 In one specific embodiment, the difference between the width D2 of the first groove segment and the width D6 of the battery cell top cover is 0.5-0.8mm; the difference between the length W2 of the first groove segment and the length W6 of the battery cell top cover is 0.5-0.8mm; and the difference between the thickness H2 of the first groove segment and the thickness H6 of the battery cell top cover is greater than or equal to 0.3mm.

[0042] By setting the above values, the first groove segment 6 can not only effectively adapt to the possible expansion of the cell top cover 4 during the pull-out test, allowing it to smoothly accommodate the cell top cover 4, but also minimize the movement gap of the cell top cover 4 in the fixture, improving the stability of the cell top cover 4 during the test, and enabling the obtained pull-out force data to more accurately and realistically reflect the mechanical properties of the cell top cover.

[0043] In this embodiment, a predetermined distance must be maintained between the second groove segment 5 and the lower segment of the pole post.

[0044] It is understandable that the aforementioned predetermined spacing can be set according to multiple factors such as the diameter of the lower section of the electrode post, the manufacturing tolerance of the cell top cover 4, the connection requirements of the test fixture, and the difference in the coefficient of thermal expansion, for example, it can be set to 0.4mm, 0.5mm or 0.7mm.

[0045] The purpose of the above arrangement is to prevent the lower section of the electrode post from contacting the inner wall of the fixture's lower cover 1, thereby further improving the accuracy of the test and protecting the lower sections of the electrode post from short circuits. Specifically, this predetermined spacing effectively prevents accidental contact between the lower section of the electrode post and the fixture's lower cover 1 when the lower section of the electrode post shifts due to vibration, thermal expansion and contraction, or mechanical stress during the test, ensuring the reliability of electrical isolation. Furthermore, the sufficient spacing provides adequate heat dissipation space for the lower section of the electrode post, preventing excessively high local temperatures from affecting the stability and accuracy of the test results.

[0046] Please refer to Figure 6 and Figure 7 It is understandable that the terminals are an important component of the battery cell top cover 4, comprising a lower terminal section and an upper terminal section. The lower terminal section includes a lower positive terminal section 10 and a lower negative terminal section 11, while the upper terminal section includes an upper positive terminal section 8 and an upper negative terminal section 9. As the external connection terminals for the positive and negative electrodes of the battery, the terminals bear the crucial function of current input and output. They are typically made of highly conductive metallic materials, such as aluminum alloys, copper alloys, or nickel-plated steel, possessing good conductivity and corrosion resistance.

[0047] Please refer to Figure 2 and Figure 6 When the lower section of the battery cell top cover 4 includes a positive lower section 10 and a negative lower section 11, in order to prevent interference between the positive lower section 10 and the negative lower section 11 and the clamp lower cover 1, it is also necessary to set the distance L2 between the first side of the positive lower section 10 and the first side of the negative lower section 11 to be less than the length W3 of the second slot; the width of the positive lower section 10 and the negative lower section 11 to be less than the width D3 of the second slot; and the height H3 of the second slot to be greater than the height of the first lower section 10 and the first lower section 11.

[0048] In one specific embodiment, the depth H3 of the second slot segment 5 is greater than or equal to 5 mm, for example, 6 mm, 7 mm, and 8 mm. Of course, depending on different application requirements and cell specifications, the depth of the second slot segment 5 can also be set to different values ​​such as greater than or equal to 8 mm, 10 mm, 12 mm, or 15 mm. No specific limitations are imposed here.

[0049] In another specific embodiment, the difference between the width D2 of the first groove segment and the width D3 of the second groove segment is equal to the difference between the length W2 of the first groove segment and the length W3 of the second groove segment. For example, D2-D3 = W2-W3 = 4mm to 8mm.

[0050] Furthermore, in this embodiment, the second region 7 needs to expose the upper section of the pole post and maintain a predetermined distance from the upper section of the pole post.

[0051] It is understandable that the aforementioned predetermined spacing can be set according to multiple factors such as the diameter of the upper section of the electrode post, the manufacturing tolerance of the cell top cover, the connection requirements of the test fixture, and the difference in the coefficient of thermal expansion, for example, it can be set to 0.2mm, 0.3mm or 0.5mm.

[0052] The purpose of the above settings is to ensure that the upper part of the pole is fully exposed during the test, so as to facilitate accurate contact and reliable connection of the test probe or connector. At the same time, the predetermined spacing avoids direct contact between the fixture cover 2 and the upper part of the pole, preventing accidental short circuits or damage caused by mechanical stress or thermal expansion.

[0053] Please refer to Figure 4 , Figure 6 and Figure 7 When the upper section of the battery cell top cover includes a positive upper section 8 and a negative upper section 9, in order to prevent the positive upper section 8 and the negative upper section 9 from interfering with the fixture top cover 2, thereby causing a short circuit in the upper section of the electrode and affecting the accuracy of the test results, it is necessary to set the length W5 of the second region to be greater than the distance L1 between the first side of the positive upper section 8 and the first side of the negative upper section 9, and set the width D5 of the second region to be greater than the width of the positive upper section 8 and the negative upper section 9.

[0054] Please refer to Figure 3 , Figure 5 and Figure 6 In one specific embodiment, when the upper cover 2 and the lower cover 1 of the clamp fix the top cover 4 of the battery cell, the protruding portion of the upper section of the electrode post is at least 0.3 mm higher than the surface of the upper cover 2 of the clamp. That is, H5-H2-H4>0.3 mm, where H5 is the sum of the thickness of the upper section of the electrode post and the thickness of the top cover of the battery cell, H2 is the height of the first groove section, and H4 is the thickness of the top cover of the battery cell.

[0055] The advantage of setting the upper protrusion of the electrode post to be at least 0.3 mm higher than the surface of the fixture cover 2 is that the minimum protrusion height of 0.3 mm provides a safety margin for slight deformation that may occur during the test. When the top cover 4 of the cell undergoes slight deformation under the action of the pulling force, it will not affect the connection between the test fixture and the upper part of the electrode post.

[0056] Please refer to Figure 1 Furthermore, to simplify the installation process of the threaded hole and ensure precise fit between the upper and lower fixtures for convenient mass production, in this embodiment, the difference between the length W1 of the lower fixture cover and the length W2 of the first groove segment is set to be equal to the difference between the width D1 of the lower fixture cover and the width D2 of the first groove segment. Similarly, the difference between the length W4 of the upper fixture cover and the length W5 of the second region is set to be equal to the difference between the width D4 of the upper fixture cover and the width D5 of the second region. In addition, the length of the upper fixture cover 2 is designed to be equal to the length of the lower fixture cover 1, and the width of the upper fixture cover 2 is also designed to be equal to the width of the lower fixture cover 1.

[0057] In one specific embodiment, D1-D2 = W1-W2 > 8mm

[0058] In another specific embodiment, (W4-W5)-(D1-D2) = 5-8 mm.

[0059] Setting (W4-W5)-(D1-D2) = 5~8mm ensures perfect concentricity and parallelism of the upper and lower fixtures during assembly, avoiding assembly difficulties or testing errors caused by dimensional deviations.

[0060] Furthermore, in this embodiment, both the upper cover and the lower cover of the clamp are provided with multiple threaded holes on their periphery, and the upper cover and the lower cover of the clamp are connected by screws or bolts.

[0061] In one specific embodiment, threaded holes are evenly distributed at the edges of the upper cover 2 and the lower cover 1 of the clamp.

[0062] Please refer to Figure 1 and Figure 4 In this embodiment, in order to ensure that the upper cover 2 of the fixture has sufficient spacing to process the threaded hole, the diameter of the threaded hole is less than or equal to (D1-D2) / 2.

[0063] The specific steps for performing a pull-out test using the above-mentioned fixture are as follows:

[0064] S1. Place the top cover 4 of the battery cell on the stepped surface formed by the stepped support groove of the lower cover 1 of the clamp, and ensure that the terminal passes through the second area 7 of the upper cover of the clamp.

[0065] S2. Fix the upper cover 2 and the lower cover 1 of the fixture together by threaded connection.

[0066] S3. Connect the drawing tool to the upper section of the pole, ensuring a secure and reliable connection.

[0067] S4. Set the pull-out distance according to the test requirements, for example, 5mm.

[0068] S5. Slowly apply tension to pull the pole out of the clamp until the set pull-out distance is reached.

[0069] S6. Record the force required during the drawing process, as well as the deformation of the top cover and the pole.

[0070] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A top cover testing fixture, characterized in that, include: The clamp upper cover and clamp lower cover are arranged sequentially from top to bottom, and the clamp upper cover is detachably installed on the clamp lower cover; The lower cover of the clamp has a first area for accommodating the top cover of the battery cell; The clamp cover has a second area inside, which is used to expose the upper part of the electrode post of the battery cell top cover; The upper and lower covers of the clamp are used to fix the top cover of the battery cell.

2. The top cover test fixture as described in claim 1, characterized in that, The first region includes a first slot segment and a second slot segment arranged sequentially from top to bottom. The first slot segment is used to accommodate the top cover of the battery cell, and the second slot segment is used to accommodate the lower section of the electrode post of the top cover of the battery cell.

3. The top cover test fixture as described in claim 2, characterized in that, The width of the first slot segment is greater than the width of the top cover of the battery cell; The length of the first slot segment is greater than the length of the top cover of the battery cell; The height of the first slot is greater than the thickness of the top cover of the battery cell.

4. The top cover test fixture as described in claim 3, characterized in that, The difference between the width of the first slot segment and the width of the top cover of the battery cell is 0.5-0.8 mm; The difference between the length of the first slot segment and the length of the top cover of the battery cell is 0.5-0.8 mm; The difference between the height of the first groove segment and the thickness of the top cover of the battery cell is greater than or equal to 0.3 mm.

5. The top cover test fixture as described in claim 2, 3, or 4, characterized in that, The second groove section needs to maintain a predetermined distance from the lower section of the pole post.

6. The top cover test fixture as described in claim 1, characterized in that, The second region needs to expose the upper section of the pole post and maintain a predetermined distance from the upper section of the pole post.

7. The top cover test fixture as described in claim 1 or 6, characterized in that, When the upper cover and lower cover of the clamp fix the top cover of the battery cell, the protruding part of the upper section of the electrode post is at least 0.3 mm higher than the surface of the upper cover of the clamp.

8. The top cover test fixture as described in claim 1, characterized in that, The length of the upper cover of the clamp is equal to the length of the lower cover of the clamp, and the width of the upper cover of the clamp is equal to the width of the lower cover of the clamp. The difference between the length of the lower cover of the clamp and the length of the first groove segment is equal to the difference between the width of the lower cover of the clamp and the width of the first groove segment. The difference between the length of the clamp cover and the length of the second region is equal to the difference between the width of the clamp cover and the width of the second region.

9. The top cover test fixture as described in claim 1, characterized in that, The upper cover and the lower cover of the clamp are provided with multiple threaded holes on their periphery, and the upper cover and the lower cover of the clamp are connected by screws or bolts.

10. The top cover test fixture as described in claim 9, characterized in that, The threaded holes are evenly distributed around the outer periphery of the upper cover and the lower cover of the clamp.

Images