Battery pole piece stripping force strength testing mechanism

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a battery pole piece stripping force strength testing mechanism which comprises a supporting plate, a constant tension guiding part and two guiding supports, the two guiding supports are arranged on the supporting plate side by side, the constant tension guiding part is arranged between the two guiding supports, and the constant tension guiding part is arranged between the two guiding supports. The constant tension guide part is arranged on the base and connected with the two guide supports, and the constant tension guide part is perpendicular to the guide supports; in the stripping process, the included angle f between the battery pole piece and the supporting plate is constant, so that when a 180-degree or 90-degree stripping mode is adopted, the curvature of the battery pole piece is not changed, the folding phenomenon of the battery pole piece is avoided, the inaccurate stripping force test caused by the difference of the included angle f is effectively reduced, and the accuracy of the stripping force test is improved; and meanwhile, the breakage of the battery pole piece caused by too large peak value at the moment of stripping can be effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery testing, and in particular relates to a battery pole piece peeling force strength testing mechanism. Background Art

[0002] Lithium-ion batteries include battery poles and separators. Battery poles include foil, active materials, binders and conductive agents. The role of the binder is to bond the active materials, conductive agents and foils, while ensuring that the active materials will not over-expand or detach from the current collector during processing and circulation, causing battery failure. Peel force testing of battery poles is a way to detect the bonding strength of battery poles. Peel force is an indicator for testing and evaluating the performance of binders.

[0003] The existing peeling test mechanism includes a tensile machine and a support plate. One end of the battery electrode is set on the support plate, and the other end of the battery electrode is connected to an active end of the tensile machine. The other active end of the tensile machine is connected to the support plate. The peeling force of the battery electrode is tested in 180° and 90° methods, either directly straight or after bending the battery electrode. When testing the peeling force after the battery electrode is bent, it is easy to pull the battery electrode to form a folding phenomenon. At this time, the tensile force fed back by the tensile machine is not the peeling force of the battery electrode, but the cohesive force of the battery electrode, and the cohesive force is much greater than the peeling force, resulting in inaccurate testing. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pole piece peeling force strength testing mechanism to address the deficiencies in the prior art, thereby solving the problem in the prior art that when testing the peeling force after the battery pole piece is bent, the battery pole piece is easily pulled to form a folded shape. At this time, the tensile testing machine feeds back the cohesive force of the battery pole piece, which is much greater than the peeling force, resulting in inaccurate peeling force testing.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A battery pole piece peeling force strength testing mechanism comprises a support plate, a constant tension guide portion and two guide brackets, wherein the two guide brackets are arranged in parallel on the support plate, the constant tension guide portion is arranged between the two guide brackets and connected to the two guide brackets, and the constant tension guide portion and the guide brackets are perpendicular to each other.

[0007] Preferably, the constant tension guide portion comprises a guide wheel and a limiting assembly, the guide wheel is arranged between the two guide brackets, and the guide wheel is connected to the guide bracket via the limiting assembly.

[0008] Preferably, the limiting assembly includes a connecting rod, a chain, a first buckle and a second buckle, the connecting rod is arranged on the guide wheel, the connecting rod is parallel to the guide bracket, the first buckle is connected to the second buckle through the chain, the first buckle is connected to the connecting rod, and the second buckle is connected to the guide bracket.

[0009] Preferably, grooves are provided at both ends of the guide wheel, and the connecting rod is arranged in the groove along the radial direction of the guide wheel.

[0010] Preferably, each of the guide brackets includes a guide rod and two support rods, the two support rods are arranged on the support plate at intervals along the length direction of the support plate, one of the two support rods is connected to one end of the guide rod, the other of the two support rods is connected to the other end of the guide rod, the connecting rod is parallel to the guide rod, and the second buckle is connected to the guide rod.

[0011] Preferably, the diameter of the first buckle ring is equal to the diameter of the connecting rod.

[0012] Preferably, the diameter of the second buckle ring is equal to the diameter of the guide rod.

[0013] Preferably, the support plate is a metal plate.

[0014] Preferably, an adhesive layer is provided between the support plate and the battery electrode.

[0015] Preferably, scale lines are provided on the support plate.

[0016] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0017] The battery pole piece peeling strength testing mechanism of the utility model is used in coordination with a support plate, a constant tension guide part and two guide brackets, the two guide brackets are arranged side by side on the support plate, and the constant tension guide part is connected to the two guide brackets, and the constant tension guide part and the guide brackets are perpendicular to each other, so that during the peeling process, the angle f between the battery pole piece and the support plate is constant, and then when a 180° or 90° peeling method is adopted, the curvature of the battery pole piece remains unchanged, and the battery pole piece is prevented from being folded in half, effectively reducing the inaccuracy of the peeling force test caused by the difference in the angle f, thereby improving the accuracy of the peeling force test. At the same time, it can effectively prevent the battery pole piece from breaking due to a large peak value at the beginning of peeling.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a structural schematic diagram of the testing mechanism of the utility model.

[0021] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0022] Figure 3 This is another structural schematic diagram of the testing mechanism of the utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the utility model using a 90° peeling method.

[0024] Figure 5 This is a schematic diagram of the structure of the utility model using a 180° peeling method.

[0025] The reference numerals are described as follows:

[0026] 100. Testing agency;

[0027] 10. Support plate; 11. Scale line;

[0028] 20. Constant tension guide; 21. Guide wheel; 211. Groove; 22. Limiting assembly; 221. Connecting rod; 222. Chain; 223. First buckle; 224. Second buckle;

[0029] 30. Guide bracket; 31. Guide rod; 32. Support rod;

[0030] 40. Adhesive layer;

[0031] 50. Anti-sticking layer;

[0032] a, the length of the support plate; b, the width of the support plate; c, the thickness of the support plate; d, the length direction of the support plate; f, the angle f between the battery electrode and the support plate;

[0033] 200. Battery electrode. DETAILED DESCRIPTION

[0034] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0035] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0036] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0037] The following will be combined with the attached Figures 1 to 5 The technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] See also Figures 1 to 5 The battery electrode peeling force strength testing mechanism 100 of the embodiment of the utility model includes a support plate 10, a constant tension guide portion 20 and two guide brackets 30, the two guide brackets 30 are arranged in parallel on the support plate 10, the constant tension guide portion 20 is arranged between the two guide brackets 30 and connected to the two guide brackets 30, and the constant tension guide portion 20 and the guide bracket 30 are perpendicular to each other.

[0039] Compared with the prior art, the battery pole piece peeling strength testing mechanism 100 of the utility model embodiment uses the support plate 10, the constant tension guide 20 and the two guide brackets 30 in coordination, and the two guide brackets 30 are arranged side by side on the support plate 10. The constant tension guide 20 is connected to the two guide brackets 30, and the constant tension guide 20 and the guide brackets 30 are perpendicular to each other, so that during the peeling process, the angle f between the battery pole piece 200 and the support plate 10 is constant, and then when the 180° or 90° peeling method is adopted, the curvature of the battery pole piece 200 remains unchanged, and the battery pole piece 200 is prevented from being folded, effectively reducing the inaccuracy of the peeling force test caused by the difference in the angle f, thereby improving the accuracy of the peeling force test. At the same time, it can effectively prevent the battery pole piece 200 from breaking due to the large peak value at the beginning of the peeling.

[0040] In some embodiments, the constant tension guide 20 includes a guide wheel 21 and a limit assembly 22, wherein the guide wheel 21 is disposed between the two guide brackets 30, and the guide wheel 21 is connected to the guide bracket 30 via the limit assembly 22. Through the coordinated use of the guide wheel 21 and the limit assembly 22, the limit assembly 22 is used to connect the guide wheel 21 and the guide bracket 30 to limit the position of the guide wheel 21, so that the guide wheel 21 can remain parallel to the support plate 10, so that during the stripping process, the angle f between the battery electrode 200 and the support plate 10 is constant, and further, when the stripping method of 180° or 90° is adopted, the curvature of the battery electrode 200 remains unchanged, thereby avoiding the battery electrode 200 from being folded in half, and improving the accuracy of the stripping force test.

[0041] Further, the diameter of the guide wheel 21 is 15-25 mm. Preferably, the diameter of the guide wheel 21 is 20 mm.

[0042] In some embodiments, the limiting assembly 22 includes a connecting rod 221, a chain 222, a first buckle 223, and a second buckle 224. The connecting rod 221 is arranged on the guide wheel 21, the connecting rod 221 is parallel to the guide bracket 30, the first buckle 223 is connected to the second buckle 224 through the chain 222, the first buckle 223 is connected to the connecting rod 221, and the second buckle 224 is connected to the guide bracket 30. The guide wheel 21 and the guide bracket 30 are used in coordination with the connecting rod 221, the chain 222, the first buckle 223, and the second buckle 224, so that the guide wheel 21 can remain parallel to the support plate 10, so that the angle f between the battery electrode 200 and the support plate 10 is constant during the stripping process. In addition, the connecting rod 221 is arranged on the guide wheel 21 and is parallel to the guide bracket 30, which can ensure the stability of the limiting assembly 22. At the same time, the connection method between the first buckle 223 and the connecting rod 221, and the second buckle 224 and the guide bracket 30 can enhance the overall stability and reliability of the testing mechanism 100.

[0043] In some embodiments, grooves 211 are provided at both ends of the guide wheel 21, and the connecting rod 221 is provided in the groove 211 along the radial direction of the guide wheel 21. Through the provision of the groove 211, the provision of the groove 211 enables the connecting rod 221 to be radially embedded in the guide wheel 21, thereby reducing the volume of the overall structure while ensuring the stability of the limiting assembly 22, making the testing mechanism 100 more compact.

[0044] In some embodiments, each of the guide brackets 30 includes a guide rod 31 and two support rods 32, the two support rods 32 are arranged on the support plate 10 at intervals along the length direction d of the support plate 10, one of the two support rods 32 is connected to one end of the guide rod 31, the other of the two support rods 32 is connected to the other end of the guide rod 31, the connecting rod 221 is parallel to the guide rod 31, and the second buckle 224 is connected to the guide rod 31. Through the arrangement of the guide rod 31 and the two support rods 32, the guide rod 31 is parallel to the connecting rod 221, and the guide rod 31 is connected to the second buckle 224, so that the guide wheel 21 can remain parallel to the support plate 10, so as to achieve a constant angle f between the battery electrode 200 and the support plate 10 during the stripping process. In addition, the two support rods 32 are connected by a guide rod 31, so that the guide bracket 30 has better stability. At the same time, the support rod 32 has a supporting effect on the guide rod 31, so that when the guide wheel 21 is connected to the guide rod 31 through the limit assembly 22, the guide wheel 21 can be close to the support plate 10 but not in contact with the support plate 10, thereby ensuring that during the peeling process, the guide wheel 21 will not apply pressure to the battery electrode 200.

[0045] Furthermore, the guide rod 31 and the two support rods 32 are an integrally formed structure, that is, the guide rod 31 and the two support rods 32 are one component.

[0046] Further, the diameter of the guide rod 31 and the diameter of the support rod 32 are both 4 to 6 mm. Preferably, the diameter of the guide rod 31 and the diameter of the support rod 32 are both 5 mm.

[0047] In some embodiments, the diameter of the first buckle ring 223 is equal to the diameter of the connecting rod 221, and the diameter of the second buckle ring 224 is equal to the diameter of the guide rod 31. By setting the diameter of the first buckle ring 223 and the diameter of the second buckle ring 224, the diameter of the first buckle ring 223 needs to match the diameter of the connecting rod 221, and the diameter of the second buckle ring 224 needs to match the diameter of the guide rod 31, so as to ensure the stability of the connection between the limiting assembly 22 and the guide wheel 21 and the guide bracket 30.

[0048] In some embodiments, the support plate 10 is a metal plate, which effectively improves the rigidity of the support plate 10.

[0049] Further, the length a of the support plate 10 is 180-220 mm, the width b of the support plate 10 is 50-90 mm, and the thickness c of the support plate 10 is 4-8 mm. Preferably, the length a of the support plate 10 is 200 mm, the width b of the support plate 10 is 70 mm, and the thickness c of the support plate 10 is 6 mm.

[0050] Specifically, the support plate 10 , the connecting rod 221 , the first buckle ring 223 , the second buckle ring 224 , the support rod 32 and the guide rod 31 are all made of manganese steel or stainless steel.

[0051] In some embodiments, an adhesive layer 40 is disposed between the support plate 10 and the battery electrode 200. Through the provision of the adhesive layer 40, during the peeling process, the adhesive layer 40 is used to provide a force for the active material layer to be peeled off from the foil.

[0052] Further, the thickness of the adhesive layer 40 is 0.5-0.8 mm. Specifically, the thickness of the adhesive layer 40 is 0.5 mm, 0.55 mm, 0.58 mm, 0.6 mm, 0.63 mm, 0.67 mm, 0.7 mm, 0.72 mm, 0.74 mm, 0.79 mm or 0.8 mm, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0053] In some embodiments, an anti-adhesion layer 50 is further provided on the support plate 10, and the anti-adhesion layer 50 is located at the front side of the guide wheel 21. Through the provision of the anti-adhesion layer 50, the anti-adhesion layer 50 can effectively prevent the end of the battery electrode 200 away from the adhesive layer 40 from being adhered to the support plate, so that the battery electrode 200 will not have a large fluctuation at the moment of peeling, and effectively prevent the battery electrode 200 from being broken due to a large peak at the moment of peeling.

[0054] In some embodiments, the support plate 10 is provided with scale lines 11. Through the provision of the scale lines 11, the scale lines 11 can assist the bonding of the bonding layer 40 and the battery electrode sheet 200 and ensure the neatness of the bonding of the battery electrode sheet 200.

[0055] The testing process of the battery electrode peeling strength testing mechanism 100 according to the embodiment of the utility model is as follows:

[0056] Paste the adhesive layer 40 onto the support plate 10;

[0057] According to the scale lines 11 on the support plate 10, the active material layer of the battery electrode 200 is pasted on the side of the adhesive layer 40 away from the support plate 10, and a roller is used to roll back and forth on the battery electrode 200 for 3 to 10 times;

[0058] Install the constant tension guide 20 onto the guide bracket 30 of the support plate 10;

[0059] Connect the support plate 10 to one working end of the tensile machine, and connect the end of the battery electrode 200 away from the adhesive layer 40 to the other working end of the tensile machine;

[0060] The equipment is started, and the tensile machine peels the battery pole piece 200 at 180° or 90°, and the peeling speed of the tensile machine is 50 mm / min.

[0061] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A battery pole piece peeling strength testing mechanism, characterized in that: The invention comprises a support plate (10), a constant tension guide portion (20) and two guide brackets (30), wherein the two guide brackets (30) are arranged in parallel on the support plate (10), the constant tension guide portion (20) is arranged between the two guide brackets (30) and connected to the two guide brackets (30), and the constant tension guide portion (20) and the guide brackets (30) are perpendicular to each other.

2. The battery pole piece peeling strength testing mechanism according to claim 1, characterized in that: The constant tension guide portion (20) comprises a guide wheel (21) and a limit assembly (22); the guide wheel (21) is arranged between two guide brackets (30); and the guide wheel (21) is connected to the guide bracket (30) via the limit assembly (22).

3. The battery pole piece peeling strength testing mechanism according to claim 2, characterized in that: The limiting assembly (22) comprises a connecting rod (221), a chain (222), a first buckle (223) and a second buckle (224); the connecting rod (221) is arranged on the guide wheel (21); the connecting rod (221) is parallel to the guide bracket (30); the first buckle (223) is connected to the second buckle (224) via the chain (222); the first buckle (223) is connected to the connecting rod (221); and the second buckle (224) is connected to the guide bracket (30).

4. The battery pole piece peeling strength testing mechanism according to claim 3, characterized in that: Both ends of the guide wheel (21) are provided with grooves (211), and the connecting rod (221) is arranged in the groove (211) along the radial direction of the guide wheel (21).

5. The battery pole piece peeling strength testing mechanism according to claim 3, characterized in that: Each guide bracket (30) comprises a guide rod (31) and two support rods (32); the two support rods (32) are arranged on the support plate (10) at intervals along the length direction d of the support plate (10); one of the two support rods (32) is connected to one end of the guide rod (31); the other of the two support rods (32) is connected to the other end of the guide rod (31); the connecting rod (221) is parallel to the guide rod (31); and the second buckle (224) is connected to the guide rod (31).

6. The battery pole piece peeling strength testing mechanism according to claim 5, characterized in that: The diameter of the first buckle ring (223) is equal to the diameter of the connecting rod (221).

7. The battery pole piece peeling strength testing mechanism according to claim 5, characterized in that: The diameter of the second buckle ring (224) is equal to the diameter of the guide rod (31).

8. The battery pole piece peeling strength testing mechanism according to claim 1, characterized in that: The support plate (10) is a metal plate.

9. The battery pole piece peeling strength testing mechanism according to claim 1, characterized in that: An adhesive layer (40) is provided between the support plate (10) and the battery electrode (200).

10. The battery pole piece peeling strength testing mechanism according to claim 1, characterized in that: The support plate (10) is provided with scale lines (11).

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