Cylindrical battery tension test fixture

Abstract

The utility model provides a kind of cylindrical battery tension test fixture, including first clamping part and second clamping part, the first clamping part upper end is equipped with the auxiliary member for the jaw of tension testing machine to grab, the side of the second clamping part is equipped with the side edge step for auxiliary fixed, the first clamping part and the second clamping part are all set up and further clamped the cylindrical clamping cavity for accommodating cylindrical battery. The utility model relates to a kind of cylindrical battery tension test fixture, first clamping part is equipped with auxiliary member to facilitate the jaw of tension testing machine to hold, so that first clamping part and second clamping part can be mutually matched to carry out tension test to the positive electrode end of cylindrical battery, while separate second clamping part can also be used to clamp the roll core of cylindrical battery, so that tension testing machine carries out negative electrode end tension test to cylindrical battery, and practicality is extremely strong.

Description

Technical Field

[0001] This utility model relates to the field of battery clamping technology, and in particular to a battery tensile testing clamp for testing the welding quality of the positive and negative ends of a cylindrical battery. Background Technology

[0002] Currently, lithium-ion / sodium-ion cylindrical batteries are gradually becoming the mainstream products in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charging and discharging. More and more manufacturers are beginning to pay attention to the welding reliability of cylindrical power batteries.

[0003] Among them, the battery tensile test is a key test for evaluating the mechanical structural integrity of the battery, especially the welding strength between the casing and the positive and negative electrodes. It simulates the battery's resistance to separation when subjected to external forces (such as drops, compression, or improper handling), and is an important indicator of battery safety and reliability.

[0004] However, due to the shape of the cylindrical battery itself (mainly because the circumferential sidewalls are difficult to clamp and the casing is prone to slippage when pulling the casing up and down), the grippers of the tensile testing machine cannot hold the casing when performing tensile tests on cylindrical batteries with the positive terminal of the battery having a welded structure through the casing tab. This makes it impossible to perform tensile tests on the positive terminal of the cylindrical battery. Utility Model Content

[0005] To address the aforementioned deficiencies in the existing technology, this utility model provides a cylindrical battery tensile testing fixture. The first clamping part is equipped with auxiliary components to facilitate gripping by the jaws of a tensile testing machine. This allows the first and second clamping parts to cooperate in performing tensile testing on the positive terminal of the cylindrical battery. Simultaneously, the separate second clamping part can also be used to clamp the core of the cylindrical battery, enabling the tensile testing machine to perform tensile testing on the negative terminal of the cylindrical battery. This fixture is highly practical.

[0006] The technical solution of this utility model to solve the above problems is: to provide a cylindrical battery tensile test fixture, including a first clamping part and a second clamping part. The upper end of the first clamping part is provided with an auxiliary component for gripping by the claws of the tensile tester. The side of the second clamping part is provided with a side edge step for auxiliary fixing. Both the first clamping part and the second clamping part are provided with cylindrical clamping cavities for accommodating and further clamping the cylindrical battery.

[0007] Furthermore, the clamping cavity on the second clamping part is a cylindrical through hole.

[0008] Furthermore, the walls of the clamping cavities of the first clamping part and the second clamping part are provided with rough textures to increase the contact friction.

[0009] Furthermore, the first clamping part includes a first left clamping block, a first right clamping block, and a first bolt. Both the first left clamping block and the first right clamping block have semi-cylindrical notches. One of the first left clamping block and the first right clamping block has a first screw hole adapted to the first bolt, and the other has a first through hole for the first bolt to be inserted. The first bolt is inserted into the first through hole and threadedly connected to the first screw hole, so that the two semi-cylindrical notches are joined together to form the clamping cavity of the first clamping part, and clamp the casing of the cylindrical battery.

[0010] Furthermore, the upper ends of the first left clamping block and the first right clamping block are provided with second screw holes. The auxiliary component is an inverted T-shaped bracket structure, and the two ends of the horizontal rod of the auxiliary component are provided with second bolts. The second bolt at one end is threaded to the second screw hole of the first left clamping block, and the second bolt at the other end is threaded to the second screw hole of the first right clamping block, so that the auxiliary component is fixedly connected to both the first left clamping block and the first right clamping block.

[0011] Furthermore, both ends of the horizontal rod of the auxiliary component are provided with second through holes for the insertion of second bolts. The second through holes are strip-shaped through holes, and the extension direction of the strip-shaped through holes is consistent with the setting direction of the first bolts.

[0012] Furthermore, the upper ends of the first left clamping block and the first right clamping block are each provided with a strip-shaped countersunk hole for accommodating a portion of the horizontal rod body of the auxiliary component, and the second screw hole is provided in the strip-shaped countersunk hole.

[0013] Furthermore, the second clamping part includes a second right clamping block, a second left clamping block, and a third bolt. Both the second right clamping block and the second left clamping block have semi-cylindrical through grooves. One of the second right clamping block and the second left clamping block has a third screw hole adapted to the third bolt, and the other has a third through hole for the third bolt to be inserted. The third bolt is inserted into the third through hole and threadedly connected to the third screw hole, so that the two semi-cylindrical through grooves are joined together to form the clamping cavity of the second clamping part, and clamp the core of the cylindrical battery.

[0014] Furthermore, the auxiliary component is provided with a clamping area for the grippers of the tensile testing machine to hold it, and the clamping area is provided with friction textures to increase the friction between the auxiliary component and the grippers.

[0015] The beneficial effects of this utility model are:

[0016] 1. The clamping cavity of the first clamping part can accommodate and clamp the casing of the cylindrical battery, and the clamping cavity of the second clamping part can accommodate and clamp the core of the cylindrical battery. The second clamping part can be pressed and fixed by the base pressure bar of the tensile testing machine through the side edge step. The jaws of the tensile testing machine can pull the casing through the clamping auxiliary parts, thereby realizing the tensile test of the positive end of the cylindrical battery.

[0017] 2. Friction textures are provided on the cavity wall of the clamping cavity to enhance frictional resistance, thereby further reducing the probability of significant movement between the first clamping part and the housing, and between the second clamping part and the core, and improving the accuracy of tensile testing.

[0018] 3. Both the first clamping part and the second clamping part adopt a splicing structure to accommodate and clamp cylindrical batteries of different sizes and models, so that the tensile testing machine can perform tensile tests on cylindrical batteries of different sizes and models.

[0019] 4. The second clamping part can also be used independently to clamp the core of the cylindrical battery. The tensile testing machine can clamp the negative current collector to perform a tensile test on the negative terminal of the cylindrical battery. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the fixture in this embodiment;

[0022] Figure 2 This is an exploded view of the first clamping part in this embodiment;

[0023] Figure 3 This is an exploded view of the second clamping part in this embodiment;

[0024] Figure 4 This is a structural diagram of the auxiliary component in this embodiment;

[0025] Figure 5 This is an external view of the cylindrical battery used for tensile testing in this embodiment.

[0026] Relevant annotations in the image:

[0027] 1-First clamping part, 11-First left clamping block, 12-First right clamping block, 13-First bolt, 14-Notched groove, 15-First screw hole, 16-First through hole, 17-Second screw hole, 18-Strip countersunk hole;

[0028] 2-Second clamping part, 21-Side edge step, 22-Second left clamping block, 23-Second right clamping block, 24-Third bolt, 25-Through groove, 26-Third screw hole, 27-Third through hole;

[0029] 3-Auxiliary component, 31-Second bolt, 32-Second through hole;

[0030] 51-Core, 52-Shell, 53-Negative current collector. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The following is based on Figures 1-5 The fixture of the present utility model embodiment is described below.

[0035] Please see Figure 1 ,by Figure 1Taking the orientation shown as an example, a cylindrical battery tensile testing fixture of this utility model includes a first clamping part 1 and a second clamping part 2. The first clamping part 1 and the second clamping part 2 are arranged vertically. Both the first clamping part 1 and the second clamping part 2 are block bodies. The first clamping part 1 has a downwardly opening cylindrical clamping cavity, and the second clamping part 2 has an upwardly opening cylindrical clamping cavity. The clamping cavity of the first clamping part 1 can just accommodate the shell of the cylindrical battery, and the clamping cavity of the second clamping part 2 can just accommodate the core of the cylindrical battery. An auxiliary component 3 for clamping and gripping by the jaws of the tensile testing machine is also fixedly installed at the upper end of the first clamping part 1. Side edge steps 21 are provided on both sides of the second clamping part 2.

[0036] For this, please refer to Figure 1 and Figure 5 ,by Figure 1 The indicated directions and Figure 5 Taking the cylindrical battery shown as an example, in the case of... Figure 5 When performing a tensile test on the positive terminal of a cylindrical battery, technicians can first cut off a portion of the casing along the circumference of the battery to expose part of the cylindrical core and its negative terminal. Then, the cylindrical battery is inverted, allowing the core to extend into the clamping cavity of the second clamping part 2 and be clamped, while the casing extends into the clamping cavity of the first clamping part 1 and is clamped. Subsequently, technicians use two side steps 21 to fix the second clamping part 2 onto the base within the tensile testing area of ​​the tensile testing machine. The grippers of the tensile testing machine are then controlled to clamp the gripping auxiliary part 3, and the auxiliary part 3 is used to pull the first clamping part 1 relative to the second clamping part 2, thereby testing the welding strength and quality of the casing and core at the positive terminal.

[0037] Further, please refer to Figures 1 to 3 In some embodiments of this utility model, the clamping cavities of the first clamping part 1 and the clamping cavities of the second clamping part 2 are provided with rough textures to increase the contact friction force, so as to further increase the frictional resistance between the shell and the cavity wall of the clamping cavity of the first clamping part 1 and the frictional resistance between the core and the cavity wall of the clamping cavity of the second clamping part 2, so as to further reduce the probability of considerable movement between the first clamping part 1 and the shell, and between the second clamping part 2 and the core, and improve the accuracy of the tensile test.

[0038] Further, please refer to Figure 2 In some embodiments of this utility model, in order to meet the clamping requirements of cylindrical batteries of different sizes in tensile testing, the first clamping part 1 adopts a split structure.

[0039] Specifically, with Figure 2Taking the orientation shown as an example, the first clamping part 1 includes a first left clamping block 11, a first right clamping block 12, and a first bolt 13. The right side wall of the first left clamping block 11 has a downwardly extending semi-cylindrical notch 14, and the left side wall of the first right clamping block 12 also has a downwardly extending semi-cylindrical notch 14. The first left clamping block 11 is also provided with two first screw holes 15, and the first right clamping block 12 is provided with two corresponding first through holes 16. The two first bolts 13 are each inserted into one of the first through holes 16 and threadedly connected to one of the first screw holes 15, so that the first left clamping block 11 and the first right clamping block 12 are aligned with each other, and the two semi-cylindrical notches 14 are spliced ​​together to form a clamping cavity with a cylindrical groove structure, thereby accommodating and clamping the casing of the cylindrical battery.

[0040] In this embodiment, the first bolt 13 is a wing bolt. For cylindrical batteries of different diameters, technicians can screw the first bolt 13 to change the length of the part of the first bolt 13 that is threaded into the first screw hole 15. The wing nut end of the first bolt 13 is used to limit the first right clamping block 12, so that the clamping cavity of the first clamping part 1 can accommodate and clamp the casing of cylindrical batteries of different diameters.

[0041] Further, please refer to Figure 2 ,by Figure 2 Taking the orientation shown as an example, in some embodiments of this utility model, in order to adapt to the first clamping part 1 for cylindrical batteries of different diameters, a split clamping and fixing structure is adopted. The auxiliary part 3 is an inverted T-shaped bracket structure, and both ends of the horizontal rod part at the lower end of the auxiliary part 3 are provided with second through holes 32. The second through holes 32 are strip-shaped through holes arranged along the connection setting direction of the first bolt 13. The two second through holes 32 are each provided with a second bolt 31. The second bolt 31 is a conventional bolt. The upper end face of the first left clamping block 11 and the upper end face of the first right clamping block 12 are each provided with a second screw hole 17.

[0042] To address this, technicians can insert each of the two second bolts 31 into a second through hole 32, and then thread them into a second screw hole 17 respectively. This allows the auxiliary component 3 to be simultaneously fixedly connected to the first left clamping block 11 and the first right clamping block 12, ensuring that the grippers of the tensile testing machine can pull the first clamping part 1 and the clamped housing through the auxiliary component 3. Furthermore, when dealing with cylindrical batteries of different diameters, if the distance between the first left clamping block 11 and the second right clamping block 23 changes, technicians can loosen the two second bolts 31 to allow the auxiliary component 3 to move along the direction of the first bolt 13, adapting to the change in the distance between the first left clamping block 11 and the first right clamping block 12, thus also adapting to cylindrical batteries of different diameters.

[0043] Further, please refer to Figure 2 and Figure 4 In some embodiments of this utility model, in order to reduce the overall height of the first clamping part 1, thereby indirectly expanding the stroke of the gripper of the tensile testing machine, and further facilitating tensile testing, the upper ends of the first left clamping block 11 and the first right clamping block 12 are provided with strip-shaped countersunk holes 18, and two second screw holes 17 are respectively provided in the two strip-shaped countersunk holes 18. The two strip-shaped countersunk holes 18 are also connected to each other when the first left clamping block 11 and the first right clamping block 12 are connected to each other, so as to accommodate the two ends of the horizontal rod of the lower end of the auxiliary component 3, thereby shortening the extension height of the auxiliary component 3.

[0044] Furthermore, with Figure 4 Taking the orientation shown as an example, although it is not shown in the accompanying drawings, it can be understood that in some embodiments of this utility model, the front and rear surfaces of the vertical body of the auxiliary component 3 are provided with clamping areas for the grippers of the tensile testing machine to hold. The clamping areas are also provided with friction textures to increase the friction between the auxiliary component 3 and the grippers, so as to ensure that the grippers of the tensile testing machine can stably clamp and hold the auxiliary component 3.

[0045] Further, please refer to Figure 3 ,by Figure 3 Taking the orientation shown as an example, in some embodiments of this utility model, the second clamping part 2 includes a second left clamping block 22, a second right clamping block 23, and a third bolt 24. A semi-cylindrical through groove 25 is provided on the right side wall of the second left clamping block 22, and the semi-cylindrical through groove 25 passes through the second left clamping block 22 vertically. A semi-cylindrical through groove 25 is also provided on the left side wall of the second right clamping block 23. The second left clamping block 22 is also provided with two third screw holes 26, and the second right clamping block 23 is provided with two corresponding third through holes 27. The two third bolts 24 are each inserted into a third through hole 27 and threadedly connected to a third screw hole 26, so that the second left clamping block 22 and the second right clamping block 23 are aligned with each other from left to right, and the two semi-cylindrical through grooves 25 are spliced ​​together to form a clamping cavity with a cylindrical through hole structure, thereby accommodating and clamping the core of the cylindrical battery.

[0046] In this embodiment, the third bolt 24 is also a wing bolt. For cylindrical batteries of different diameters, technicians can screw the third bolt 24 to change the length of the part of the body of the third bolt 24 that is threaded into the third screw hole 26. The wing nut end of the bolt can limit the second right clamping block 23, so that the clamping cavity of the second clamping part 2 can accommodate and clamp the core of cylindrical batteries of different diameters.

[0047] The clamping cavity on the second clamping part 2 is a cylindrical through hole.

[0048] The second clamping part 2 includes a second right clamping block 23, a second left clamping block 22, and a third bolt 24. Both the second right clamping block 23 and the second left clamping block 22 are provided with semi-cylindrical through grooves 25. One of the second right clamping block 23 and the second left clamping block 22 is provided with a third screw hole 26 adapted to the third bolt 24, and the other is provided with a third through hole 27 for the third bolt 24 to be inserted. The third bolt 24 is inserted into the third through hole 27 and threadedly connected to the third screw hole 26, so that the two semi-cylindrical through grooves 25 are joined together to form the clamping cavity of the second clamping part 2 and clamp the core of the cylindrical battery.

[0049] It should also be noted that in this embodiment, since the clamping cavity of the second clamping part 2 is a cylindrical through hole, the clamping cavity of the second clamping part 2 alone can clamp the core of the cylindrical battery that is facing forward, and then fix it to the test base of the tensile testing machine. Then the jaws of the tensile testing machine directly grasp the current collector of the negative terminal of the cylindrical battery to perform a negative electrode tensile test on the cylindrical battery with the tab and current collector welded to the negative terminal.

[0050] Anything not mentioned above applies to existing technologies.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cylindrical battery tensile force testing fixture, characterized in that, It includes a first clamping part (1) and a second clamping part (2). The upper end of the first clamping part (1) is provided with an auxiliary part (3) for gripping by the claws of the tensile testing machine. The side of the second clamping part (2) is provided with a side edge step (21) for auxiliary fixing. Both the first clamping part (1) and the second clamping part (2) are provided with cylindrical clamping cavities for accommodating and further clamping the cylindrical battery.

2. The clamp as described in claim 1, characterized in that, The clamping cavity opened on the second clamping part (2) is a cylindrical through hole.

3. The clamp as described in claim 1, characterized in that, The clamping cavities of the first clamping part (1) and the second clamping part (2) are provided with rough textures on the cavity walls to increase the contact friction.

4. The clamp as described in claim 1, characterized in that, The first clamping part (1) includes a first left clamping block (11), a first right clamping block (12), and a first bolt (13). The first left clamping block (11) and the first right clamping block (12) are both provided with semi-cylindrical notches (14). One of the first left clamping block (11) and the first right clamping block (12) is provided with a first screw hole (15) adapted to the first bolt (13), and the other is provided with a first through hole (16) for the first bolt (13) to be inserted. The first bolt (13) is inserted into the first through hole (16) and threadedly connected to the first screw hole (15) so that the two semi-cylindrical notches (14) are joined together to form the clamping cavity of the first clamping part (1) and clamp the casing of the cylindrical battery.

5. The clamp as described in claim 4, characterized in that, The upper ends of the first left clamping block (11) and the first right clamping block (12) are provided with second screw holes (17). The auxiliary component (3) is an inverted T-shaped bracket structure, and the two ends of the horizontal rod of the auxiliary component (3) are provided with second bolts (31). The second bolt (31) at one end is threaded to the second screw hole (17) of the first left clamping block (11), and the second bolt (31) at the other end is threaded to the second screw hole (17) of the first right clamping block (12), so that the auxiliary component (3) is fixedly connected to both the first left clamping block (11) and the first right clamping block (12).

6. The clamp as described in claim 5, characterized in that, The auxiliary component (3) has a second through hole (32) at both ends of the horizontal rod for inserting the second bolt (31). The second through hole (32) is a strip-shaped through hole, and the extension direction of the strip-shaped through hole is consistent with the setting direction of the first bolt (13).

7. The clamp as described in claim 5, characterized in that, The upper ends of the first left clamping block (11) and the first right clamping block (12) are provided with strip-shaped countersunk holes (18) for accommodating part of the horizontal rod body of the auxiliary component (3), and the second screw hole (17) is provided in the strip-shaped countersunk holes (18).

8. The clamp as described in claim 1, characterized in that, The second clamping part (2) includes a second right clamping block (23), a second left clamping block (22), and a third bolt (24). The second right clamping block (23) and the second left clamping block (22) are each provided with a semi-cylindrical through groove (25). One of the second right clamping block (23) and the second left clamping block (22) is provided with a third screw hole (26) adapted to the third bolt (24), and the other is provided with a third through hole (27) for the third bolt (24) to be inserted. The third bolt (24) is inserted into the third through hole (27) and threadedly connected to the third screw hole (26) so that the two semi-cylindrical through grooves (25) are joined together to form the clamping cavity of the second clamping part (2) and clamp the core of the cylindrical battery.

9. The clamp as described in claim 1, characterized in that, The auxiliary component (3) is provided with a clamping area for the grippers of the tensile testing machine to hold it, and the clamping area is provided with friction texture to increase the friction between the auxiliary component (3) and the grippers.

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