Jig

Abstract

The utility model discloses a jig which is used for fixing a battery cell in the process of testing the top sealing tension of the battery cell, and relates to the technical field of battery manufacturing. The battery cell comprises a battery cell body and a tab which are connected with each other, the jig is characterized in that the jig comprises a first clamping device and a second clamping device, the first clamping device is used for clamping the battery cell body, the second clamping device is used for clamping the tab, and the first clamping device is used for clamping the battery cell body. The first clamping device comprises a first device body, a first fixing piece and a second fixing piece, the first fixing piece and the second fixing piece are movably connected with the first device body, and the first fixing piece and the second fixing piece are oppositely arranged; the first fixing piece and the second fixing piece can move relative to the first device body so as to adjust the fixing positions of the first fixing piece and the second fixing piece. According to the scheme, the problem that the test precision is poor in the process of testing the top sealing tension of the battery cell by a current jig can be solved.

Description

Technical Field

[0001] This application belongs to the technical field of battery manufacturing, and particularly relates to a jig. Background Art

[0002] With the continuous development of battery technology, the top-sealing tensile test of battery cells plays an increasingly important role in battery production. After the battery cell is manufactured, the top-sealing edge of the battery cell is bent for gluing and fixing, and then the top-sealing tensile test is carried out to check the fixing effect of the top-sealing edge, which is beneficial to improving the safety and reliability of the battery.

[0003] In the top-sealing tensile test, industry-standard jigs are usually used to fix the battery cells, and then the pulling test is carried out by a tensile testing machine. In practical applications, after the first clamping device and the second clamping device of the jig are respectively installed on different tensile testing machines, their positions are fixed. However, due to inevitable assembly errors between the first clamping device and the second clamping device, some of the battery cells are tilted after being fixed, resulting in low accuracy of the tensile test. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a jig for fixing a battery cell during the process of testing the top-sealing tensile force of the battery cell, which can solve the problem of poor test accuracy caused by the current jig during the process of testing the top-sealing tensile force of the battery cell.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] The embodiments of this application provide a jig for fixing a battery cell during the process of testing the top-sealing tensile force of the battery cell. The battery cell includes a connected battery cell body and an electrode tab. The jig includes a first clamping device and a second clamping device. The first clamping device is used for clamping the battery cell body, and the second clamping device is used for clamping the electrode tab.

[0007] Among them, the first clamping device includes a first device main body, a first fixing member, and a second fixing member. The first fixing member and the second fixing member are both movably connected to the first device main body. The first fixing member and the second fixing member are arranged opposite to each other, and both the first fixing member and the second fixing member can move relative to the first device main body to adjust the fixing positions of the first fixing member and the second fixing member.

[0008] In the embodiment of the present application, the first clamping device is used to clamp the cell body, and the second clamping device is used to clamp the tab. Wherein, the first clamping device includes a first device body, a first fixing member and a second fixing member. The first fixing member and the second fixing member are both movably connected to the first device body. The first fixing member and the second fixing member are arranged opposite to each other, and both the first fixing member and the second fixing member can move relative to the first device body to adjust the fixing positions of the first fixing member and the second fixing member, so as to compensate for the assembly error between the first clamping device and the second clamping device, and further ensure that the cell body and the tab are aligned, avoid the cell from tilting, and improve the accuracy of the subsequent tensile test. Therefore, the embodiment of the present application can solve the problem of poor test accuracy caused by the current jig during the test of the top seal tensile force of the cell. Description of the Drawings

[0009] Figures 1 to 2 Structural schematic diagrams of the jig and the cell disclosed in the embodiment of the present application from different perspectives;

[0010] Figure 3 Structural schematic diagram of the first clamping device disclosed in the embodiment of the present application;

[0011] Figure 4 Structural schematic diagram of the second clamping device disclosed in the embodiment of the present application.

[0012] Description of the Reference Numerals:

[0013] 100 - cell, 110 - cell body, 120 - tab;

[0014] 200 - first clamping device, 210 - first device body, 211 - receiving groove, 211a - first side wall, 211b - second side wall, 211c - bottom of the groove, 212 - connecting hole, 213 - connecting portion, 213a - pin hole, 220 - first fixing member, 221 - fastening member, 221a - connecting rod, 221b - operating rod, 222 - fixing block, 222a - limiting groove, 223 - protective pad, 230 - second fixing member;

[0015] 300 - second clamping device, 310 - second device body, 311 - first positioning surface, 312 - limiting protrusion, 312a - guiding hole, 313 - protruding portion, 313a - first inclined surface, 320 - third fixing member, 321 - second positioning surface, 322 - second inclined surface. Detailed Embodiments

[0016] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0017] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0018] Next, the fixture provided in the embodiments of the present application will be described in detail with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0019] As Figures 1 to 4 shown, the embodiment of the present application provides a fixture for fixing the battery cell 100 during the process of testing the top-sealing tensile force of the battery cell. Of course, this fixture can also be used to fix structures such as nickel sheets during the nickel sheet welding tensile test, and for other similar tensile tests. The embodiments of the present application do not make specific limitations in this regard.

[0020] The battery cell 100 includes a connected battery cell body 110 and an electrode tab 120. Optionally, one end of the electrode tab 120 is welded to the top surface of the battery cell body 110 to lead out the positive and negative electrodes of the battery cell body 110.

[0021] The fixture includes a first clamping device 200 and a second clamping device 300. The first clamping device 200 is used to clamp the battery cell body 110, and the second clamping device 300 is used to clamp the electrode tab 120.

[0022] Among them, the first clamping device 200 includes a first device body 210, a first fixing member 220, and a second fixing member 230. Both the first fixing member 220 and the second fixing member 230 are movably connected to the first device body 210. The first fixing member 220 and the second fixing member 230 are arranged opposite to each other to clamp the cell body 110. Both the first fixing member 220 and the second fixing member 230 can move relative to the first device body 210 to adjust the fixing positions of the first fixing member 220 and the second fixing member 230, thereby compensating for the assembly error between the first clamping device 200 and the second clamping device 300, and further ensuring that the cell body 110 is aligned with the tab 120, avoiding the inclination of the cell 100, so as to improve the accuracy of subsequent tensile tests. Therefore, the embodiment of the present application can solve the problem of poor test accuracy caused by the current jig during the test of the top-sealing tensile force of the cell. In addition, by adjusting the fixing positions of the first fixing member 220 and the second fixing member 230, cells with different thicknesses can be adapted, so as to meet the top-sealing tensile force tests of various types of cells.

[0023] It should be noted that before the first clamping device 200 and the second clamping device 300 clamp the cell 100, the first clamping device 200 and the second clamping device 300 need to be installed on different tensile testing machines respectively to facilitate subsequent tensile tests. Optionally, the first clamping device 200 and the second clamping device 300 can be arranged in the horizontal direction or in the vertical direction. The embodiment of the present application does not make specific limitations on this.

[0024] In an optional embodiment, the second clamping device 300 includes a second device body 310 and a third fixing member 320. The third fixing member 320 is movably connected to the second device body 310. The second device body 310 is provided with a first positioning surface 311, and the third fixing member 320 is provided with a second positioning surface 321. The second positioning surface 321 and the first positioning surface 311 are arranged opposite to each other. The third fixing member 320 can move relative to the first positioning surface 311 so that the second positioning surface 321 and the first positioning surface 311 clamp both sides of the tab 120 in its thickness direction, that is, the tab 120 is clamped by means of surface contact, thereby dispersing the force acting on the tab 120 and avoiding stress concentration to protect the tab 120.

[0025] Optionally, the first positioning surface 311 and the second positioning surface 321 can act on a part of the tab 120; or, in other embodiments, in the thickness direction of the tab 120, the orthographic projections of the first positioning surface 311 and the second positioning surface 321 both cover the orthographic projection of the tab 120. At this time, the areas of the first positioning surface 311 and the second positioning surface 321 acting on the tab 120 are larger, which is beneficial to further protecting the tab 120.

[0026] In a further optional embodiment, both the first device body 210 and the second device body 310 are provided with receiving grooves 211. The receiving groove 211 has a first side wall 211a and a second side wall 211b that are oppositely arranged. Optionally, both the first device body 210 and the second device body 310 may include a first plate segment, a second plate segment, and a third plate segment that are sequentially connected. The first plate segment and the third plate segment are both bent relative to the second plate segment, and the first plate segment and the third plate segment are oppositely arranged, so that the first plate segment, the second plate segment, and the third plate segment enclose the above-mentioned receiving groove 211. The first plate segment is provided with the first side wall 211a, the third plate segment is provided with the second side wall 211b, and the second plate segment is provided with the bottom of the receiving groove 211. That is, both the first device body 210 and the second device body 310 adopt a three-segment structure, which is not only convenient for manufacturing, but also can provide a receiving space for the battery cell 100.

[0027] Optionally, at least one of the first side wall 211a and the second side wall 211b is provided with a connection hole 212. The first fixing member 220 and the second fixing member 230 are respectively threadedly connected to the connection hole 212 of the first device body 210. Parts of the first fixing member 220 and the second fixing member 230 respectively pass through the connection hole 212 of the first device body 210 and extend into the receiving groove 211 of the first device body 210. In this case, at least part of the battery cell body 110 is located in the receiving groove 211 of the first device body 210; the third fixing member 320 is threadedly connected to the connection hole 212 of the second device body 310, and part of the third fixing member 320 passes through the connection hole 212 of the second device body 310 and extends into the receiving groove 211 of the second device body 310. In this case, at least part of the tab 120 is located in the receiving groove 211 of the second device body 310. In this solution, the receiving groove 211 of the first device body 210 and the receiving groove 211 of the second device body 310 respectively provide a receiving space for the battery cell body 110 and the tab 120, thereby reducing the occupied space of the battery cell 100 and the jig. Of course, the first fixing member 220 and the second fixing member 230 may also be movably arranged on the top surface of the first device body 210, and the third fixing member 320 may be movably arranged on the top surface of the second device body 310. At this time, the tab 120 can be clamped between the third fixing member 320 and the top surface of the second device body 310.

[0028] In an alternative embodiment, the first fixing member 220, the second fixing member 230, and the third fixing member 320 each include a fastener 221 and a fixing block 222. Optionally, the fastener 221 may be a structure such as a bolt, and no specific limitation is imposed here. The fixing block 222 is rotatably connected to one end of the fastener 221, and the fastener 221 is threadedly connected to the connection hole 212. That is to say, when the fastener 221 undergoes relative displacement with respect to the connection hole 212, the fastener 221 can drive the fixing block 222 to move together. At the same time, relative rotation occurs between the fastener 221 and the fixing block 222. The fixing block 222 of the first fixing member 220 and the fixing block 222 of the second fixing member 230 clamp the battery cell body 110, and the fixing block 222 of the third fixing member 320 is provided with a second positioning surface 321. In this solution, by providing the fixing block 222 at one end of the fastener 221, the fixing block 222 of the first fixing member 220 and the fixing block 222 of the second fixing member 230 clamp the battery cell body 110, thereby increasing the contact area between the first fixing member 220 and the second fixing member 230 and the battery cell body 110 respectively, so as to improve the stability of the battery cell body 110, and thus improve the accuracy of the tensile test. Of course, the above-mentioned fixing block 222 may not be provided. In this case, the fastener 221 of the first fixing member 220 and the fastener 221 of the second fixing member 230 clamp the battery cell body 110, and the fastener 221 of the third fixing member 320 is provided with a second positioning surface 321.

[0029] Optionally, the fixing block 222 of the first fixing member 220 and the fixing block 222 of the second fixing member 230 may both be rectangular structures to adapt to the battery cell body 110, thereby improving the stability of the battery cell body 110.

[0030] Optionally, at least one of the first side wall 211a and the second side wall 211b of the second device main body 310 is provided with a connection hole 212, and the other is provided with a protrusion 313. The protrusion 313 is provided with a first positioning surface 311 and a first inclined surface 313a. The first inclined surface 313a is connected to the first positioning surface 311. The fixing block 222 of the third fixing member 320 is provided with a second inclined surface 322 connected to the second positioning surface 321. In the extending direction of the battery cell body 110 towards the electrode tab 120, the cross-sectional areas of the end of the protrusion 313 close to the battery cell body 110 and the end of the fixing block 222 of the third fixing member 320 close to the battery cell body 110 both gradually increase to avoid other structures on the top surface of the battery cell body 110.

[0031] In an alternative embodiment, the fixing blocks 222 of the first fixing member 220 and the fixing blocks 222 of the second fixing member 230 can both be in direct contact with the battery cell body 110; alternatively, a protective pad 223 is provided on the side of the fixing block 222 of the first fixing member 220 facing away from the fastener 221 and on the side of the fixing block 222 of the second fixing member 230 facing away from the fastener 221, so as to prevent the first fixing member 220 and the second fixing member 230 from directly acting on the battery cell body 110, thereby protecting the battery cell body 110 and the aluminum-plastic film wrapped on the surface of the battery cell body 110.

[0032] Optionally, the protective pad 223 is a deformable structure. When the first fixing member 220 and the second fixing member 230 clamp the battery cell body 110, the protective pad 223 can undergo a certain amount of deformation, which can not only improve the protection effect of the protective pad 223, but also play an anti-slip role to improve the stability of the battery cell body 110. Of course, the protective pad 223 can also be a non-deformable structure.

[0033] Optionally, the protective pad 223 can be a silica gel pad, which has good flexibility, tear resistance and anti-slip properties.

[0034] Optionally, during the process of rotating the fastener 221 of the third fixing member 320, the fixing block 222 of the third fixing member 320 can be manually fixed to prevent it from rotating together with the fastener 221; alternatively, in other embodiments, a limiting protrusion 312 and the above-mentioned connection hole 212 are provided on one of the first side wall 211a and the second side wall 211b of the second device body 310. The limiting protrusion 312 faces the first positioning surface 311, and a guiding hole 312a is provided in the limiting protrusion 312. The guiding hole 312a is communicated with the connection hole 212, and the central axis of the guiding hole 312a coincides with the central axis of the connection hole 212. One end of the fastener 221 of the third fixing member 320 passes through the connection hole 212 and the guiding hole 312a in sequence and is connected to the fixing block 222. During the process of the fastener 221 of the third fixing member 320 moving relative to the connection hole 212 of the second device body 310, the guiding hole 312a can provide guidance for the fastener 221 of the third fixing member 320 to prevent it from tilting, thereby improving the working efficiency of the third fixing member 320.

[0035] Optionally, the fixing block 222 of the second clamping device 300 is provided with a limiting groove 222a, and at least a part of the limiting protrusion 312 extends into the limiting groove 222a, and the limiting protrusion 312 is in limiting cooperation with the limiting groove 222a. During the process of rotating the fastener 221 of the third fixing member 320, the limiting protrusion 312 is in limiting cooperation with the limiting groove 222a, so as to prevent the fixing block 222 of the third fixing member 320 from rotating together with the fastener 221, so that the second positioning surface 321 is aligned with the first positioning surface 311 to accurately clamp the ear 120, thereby improving the stability of the ear 120.

[0036] In another alternative embodiment, at least one of the surface of the fixing block 222 of the third fixing member 320 facing the first positioning surface 311 of the second device main body 310 and the first positioning surface 311 of the second device main body 310 is provided with an anti-slip structure, so as to prevent the tab 120 from slipping off the second clamping device 300 during the tensile test. Therefore, through the anti-slip structure, the stability of the tab 120 can be improved, and then the accuracy of the tensile test can be improved. Of course, the above anti-slip structure may not be provided.

[0037] Optionally, during the process of rotating the fasteners 221 of the first fixing member 220 and the fasteners 221 of the second fixing member 230, the fixing blocks 222 of the first fixing member 220 and the fixing blocks 222 of the second fixing member 230 can be manually fixed to prevent them from rotating together with the fasteners 221; or, in another alternative embodiment, the fixing blocks 222 of the first fixing member 220 and the fixing blocks 222 of the second fixing member 230 are both located in the receiving groove 211 of the first device main body 210, and both can be slidably supported on the bottom 211c of the receiving groove 211 of the first device main body 210. In this case, during the process of rotating the fasteners 221 of the first fixing member 220 and the fasteners 221 of the second fixing member 230, the bottom 211c of the receiving groove 211 of the first device main body 210 can block the fixing blocks 222 of the first fixing member 220 and the fixing blocks 222 of the second fixing member 230 from rotating together with the fasteners 221, preventing the fixing blocks 222 from rotating relative to the battery cell body 110, thereby protecting the battery cell body 110 and the aluminum plastic film wrapped on the battery cell body 110.

[0038] In a further alternative embodiment, one of the bottom 211c of the first device main body 210 and the fixing blocks 222 of the first clamping device 200 is provided with a guiding protrusion, and the other is provided with a guiding groove, and the guiding protrusion is in sliding fit with the guiding groove. Here, the fixing blocks 222 of the first clamping device 200 specifically refer to the fixing blocks 222 of the first fixing member 220 and the fixing blocks 222 of the second fixing member 230. During the process of the fixing blocks 222 of the first fixing member 220 and the fixing blocks 222 of the second fixing member 230 moving relative to the bottom 211c of the first device main body 210 respectively, the guiding protrusion is in sliding fit with the guiding groove, which is beneficial to improving the moving accuracy and stability of the first fixing member 220 and the second fixing member 230, thereby improving their working efficiency.

[0039] In an alternative embodiment, the fastener 221 includes a connecting rod 221a and an operating rod 221b. The first end of the connecting rod 221a is threadedly connected to the connecting hole 212. The second end of the connecting rod 221a is connected to the operating rod 221b. The central axis of the connecting rod 221a is perpendicular to the central axis of the operating rod 221b. At this time, using the lever principle, the connecting rod 221a can be driven to rotate by the operating rod 221b, so as to save the force applied to the fastener 221.

[0040] Optionally, the second end of the connecting rod 221a is connected to the middle part of the operating rod 221b. At this time, the user can hold both ends of the operating rod 221b simultaneously to drive the connecting rod 221a to rotate, thus facilitating the user's operation.

[0041] Optionally, a connecting portion 213 is provided on the surface of each of the first device main body 210 and the second device main body 310 facing away from the receiving groove 211. The connecting portion 213 is provided with a pin hole 213a. The insertion pin of the tensile testing machine is inserted into and cooperates with the pin hole 213a, so as to respectively connect the first clamping device 200 and the second clamping device 300 to each tensile testing machine in one-to-one correspondence.

[0042] Based on the fixture disclosed in the embodiments of the present application, the embodiments of the present application also disclose a tensile testing method, which specifically includes:

[0043] S100. Install the first clamping device 200 and the second clamping device 300 onto different tensile testing machines respectively.

[0044] S200. Place the cell 100 after glue application into the first clamping device 200, and adjust the position of the cell 100 and clamp the cell body 110 by the first fixing member 222 and the second fixing member 230.

[0045] S300. Unscrew the second clamping device 300, place the tab 120 into the second clamping device 300, and tighten the third fixing member 320 to clamp the tab 120.

[0046] S400. Control the tensile testing machine to complete the test and record the tensile data.

[0047] Optionally, after step S300, when the cell body 110 and the tab 120 are not aligned, the fixing positions of the first fixing member 222 and the second fixing member 230 can be adjusted to adjust the position of the cell body 110, so that the cell body 110 and the tab 120 are aligned, thereby improving the accuracy of the tensile test.

[0048] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A fixture for fixing a battery cell (100) during the process of testing the top-sealing tensile force of the battery cell. The battery cell (100) includes a battery cell body (110) and a tab (120) connected to each other, and is characterized in that, The fixture includes a first clamping device (200) and a second clamping device (300). The first clamping device (200) is used for clamping the battery cell body (110), and the second clamping device (300) is used for clamping the tab (120). Among them, the first clamping device (200) includes a first device body (210), a first fixing member (220) and a second fixing member (230). Both the first fixing member (220) and the second fixing member (230) are movably connected to the first device body (210). The first fixing member (220) and the second fixing member (230) are arranged oppositely. Both the first fixing member (220) and the second fixing member (230) can move relative to the first device body (210) to adjust the fixing positions of the first fixing member (220) and the second fixing member (230).

2. The jig according to claim 1, wherein The second clamping device (300) includes a second device body (310) and a third fixing member (320). The third fixing member (320) is movably connected to the second device body (310). The second device body (310) is provided with a first positioning surface (311), and the third fixing member (320) is provided with a second positioning surface (321). The second positioning surface (321) and the first positioning surface (311) are arranged oppositely. The third fixing member (320) can move relative to the first positioning surface (311) so that the second positioning surface (321) and the first positioning surface (311) clamp both side surfaces of the tab (120) in its thickness direction.

3. The jig according to claim 2, characterized in that, Both the first device body (210) and the second device body (310) are provided with receiving grooves (211). The receiving groove (211) has a first side wall (211a) and a second side wall (211b) arranged oppositely. At least one of the first side wall (211a) and the second side wall (211b) is provided with a connection hole (212). The first fixing member (220) and the second fixing member (230) are respectively threadedly connected to the connection hole (212) of the first device body (210). Parts of the first fixing member (220) and the second fixing member (230) respectively pass through the connection hole (212) of the first device body (210) and extend into the receiving groove (211). The third fixing member (320) is threadedly connected to the connection hole (212) of the second device body (310). A part of the third fixing member (320) passes through the connection hole (212) of the second device body (310) and extends into the receiving groove (211).

4. The jig according to claim 3, characterized in that, The first fixing member (220), the second fixing member (230), and the third fixing member (320) each include a fastener (221) and a fixing block (222). The fixing block (222) is rotatably connected to one end of the fastener (221). The fastener (221) is threadedly connected to the connection hole (212). The fixing block (222) of the first fixing member (220) and the fixing block (222) of the second fixing member (230) clamp the battery cell body (110). The fixing block (222) of the third fixing member (320) is provided with the second positioning surface (321).

5. The jig according to claim 4, characterized in that, A protective pad (223) is provided on one surface of the fixing block (222) of the first fixing member (220) facing away from the fastener (221) and on one surface of the fixing block (222) of the second fixing member (230) facing away from the fastener (221).

6. The jig according to claim 5, characterized in that, The protective pad (223) is a deformable structure.

7. The jig according to claim 4, characterized in that, One of the first side wall (211a) and the second side wall (211b) of the second device body (310) is provided with a limiting protrusion (312) and the connection hole (212). The limiting protrusion (312) faces the first positioning surface (311). The limiting protrusion (312) is provided with a guiding hole (312a). The guiding hole (312a) is communicated with the connection hole (212), and the central axis of the guiding hole (312a) coincides with the central axis of the connection hole (212). The fixing block (222) of the second clamping device (300) is provided with a limiting groove (222a). At least a part of the limiting protrusion (312) extends into the limiting groove (222a). The limiting protrusion (312) and the limiting groove (222a) are in limiting cooperation.

8. The jig according to claim 4, wherein At least one of the surface of the fixing block (222) of the third fixing member (320) facing the first positioning surface (311) of the second device body (310) and the first positioning surface (311) of the second device body (310) is provided with an anti-slip structure.

9. The jig according to claim 4, characterized in that The fixing block (222) of the first fixing member (220) and the fixing block (222) of the second fixing member (230) are both located in the receiving groove (211) of the first device body (210), and both are slidably supported on the bottom (211c) of the receiving groove (211) of the first device body (210).

10. The jig according to claim 9, wherein, One of the bottom (211c) of the first device body (210) and the fixing block (222) of the first clamping device (200) is provided with a guiding protrusion, and the other is provided with a guiding groove. The guiding protrusion and the guiding groove are in sliding cooperation.

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