Pole piece testing device

Abstract

The utility model discloses a pole piece testing device, which comprises a clamping assembly and a thrust assembly, and is characterized in that the clamping assembly comprises two clamps, and the two clamps are arranged at an interval along a first direction and are respectively used for clamping two ends of a pole piece; the thrust assembly comprises a push rod and a push block connected with the push rod, the push rod is used for driving the push block to move in the second direction, the push block comprises an arc-shaped surface, and the arc-shaped surface is used for abutting against the pole piece, so that the pole piece is stretched in a bent state; on the one hand, the state and performance of the pole piece can be prevented from being changed in the unfolding and flattening process, on the other hand, the pole piece in the bent state is stretched, the real stress state of the pole piece wound in the battery monomer can be simulated to a certain extent, and thus the accuracy of the elongation at break test of the pole piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and in particular to a pole piece testing device. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, the performance of battery cells directly affects the overall performance of battery devices. Currently, the elongation at break test can be performed on the pole pieces inside the battery cells to optimize the performance of the pole pieces and battery cells, but the test accuracy of the pole piece test device in the related technology is low. Utility Model Content

[0004] An embodiment of the present application provides a pole piece testing device, which can improve the accuracy of pole piece fracture elongation testing.

[0005] In the first aspect, an embodiment of the present application provides a pole piece testing device, including a clamping assembly and a thrust assembly, the clamping assembly includes two clamps, the two clamps are arranged at intervals along a first direction, and are respectively used to clamp the two ends of the pole piece; the thrust assembly includes a push rod and a push block connected to the push rod, the push rod is used to drive the push block to move along a second direction, the push block includes an arcuate surface, the arcuate surface is used to press the pole piece, and the second direction is arranged to intersect with the first direction.

[0006] In the above scheme, the two clamps are arranged at intervals along the first direction, and the thrust assembly includes a push rod and a push block connected to the push rod. When the two clamps respectively clamp the two ends of the pole piece, the push rod drives the push block to move along the second direction. The arc surface of the push block can press the pole piece during the movement, so that the pole piece is stretched in a bent state. On the one hand, there is no need to unfold and flatten the wound pole piece before stretching, which can avoid changes in the state and performance of the pole piece during the unfolding and flattening process. On the other hand, by stretching the pole piece in the bent state, the actual stress state of the pole piece when it is wound and set inside the battery cell can be simulated to a certain extent, thereby improving the accuracy of the pole piece's fracture elongation test.

[0007] In some embodiments, the push block includes a first side portion and a second side portion arranged along a first direction, the first side portion and the second side portion both include a first plane and a first curved surface, the first plane of the first side portion and the first plane of the second side portion are relatively arranged in the first direction, the first curved surface of the first side portion and the first curved surface of the second side portion constitute at least a part of the curved surface, and in the first direction, the distance between the first side portion and the second side portion can be adjusted.

[0008] In the above scheme, the distance between the first side portion and the second side portion in the first direction is adjustable, that is, the width of the push block in the first direction is adjustable. By adjusting the distance between the first side portion and the second side portion in the first direction, the width of the push block in the first direction can be changed, so that the push block can be adapted to pole pieces of different models and sizes, so as to improve the application range of the pole piece testing device, which is beneficial to reduce the cost of the pole piece testing device compared to replacing different thrust components to adapt it to different pole pieces.

[0009] In some embodiments, the first side portion and the second side portion both include a side portion body and a limiting protrusion, the limiting protrusion is arranged on one side of the side portion body along a third direction, the third direction is perpendicular to the first direction and the second direction respectively, the push block also includes a locking component, the locking component has at least two limiting holes, the limiting protrusion of the first side portion and the limiting protrusion of the second side portion are respectively inserted into the at least two limiting holes.

[0010] In the above scheme, the first side portion and the second side portion are both provided with a side portion body and a limiting protrusion arranged on one side of the side portion body along the third direction. On this basis, a locking component is provided with at least two limiting holes, so that the limiting protrusion of the first side portion and the limiting protrusion of the second side portion are respectively inserted into the corresponding two limiting holes, so as to lock the first side portion and the second side portion along the first direction by the locking component. The structure is simple and the disassembly and assembly are convenient.

[0011] In some embodiments, the push block further includes a supporting component, which is clamped between the first side portion and the second side portion and is used to support the first side portion and the second side portion in the first direction.

[0012] In the above scheme, the support component is clamped between the first side portion and the second side portion, which is equivalent to being arranged in the gap between the first side portion and the second side portion with an interference fit. The support component can support the first side portion and the second side portion, thereby reducing the risk of deformation of the first side portion and the second side portion in the process of pressing the pole piece, and improving the stability of the first side portion and the second side portion.

[0013] In some embodiments, a gap is formed between the first side portion and the second side portion, and the gap has a first end and a second end arranged opposite to each other along the second direction. The push block also includes an adjusting component, which is located at the first end and is at least partially stuck in the gap. In the second direction, the width of the adjusting component along the first direction tends to increase in the direction from the second end to the first end.

[0014] In the above scheme, in the second direction along the direction from the second end to the first end, the width of the adjusting component in the first direction tends to increase. Therefore, by moving the adjusting component in the second direction to control the size of the adjusting component clamped in the gap, the width of the gap in the first direction can be changed, thereby realizing the distance adjustment between the first side portion and the second side portion in the first direction. The structure is simple and the operation is convenient.

[0015] In some embodiments, the first surface of the first side portion and the first surface of the second side portion both include guide surfaces, and the two guide surfaces are inclined away from each other along the direction pointing from the second end to the first end in the second direction, and at least a portion of the adjustment component is clamped between the two guide surfaces.

[0016] In the above scheme, two guide surfaces are arranged to be inclined in the direction away from each other along the direction from the second end to the first end in the second direction, so that at least part of the adjustment component is clamped between the two guide surfaces. Therefore, when the width of the gap along the first direction is adjusted by moving the adjustment component, the guide surface can play a guiding role, thereby reducing the difficulty of adjusting the adjustment component. In addition, when at least part of the adjustment component is clamped between the two guide surfaces, the two side surfaces of the adjustment component in the first direction can be respectively fitted with the two guide surfaces, thereby reducing the risk of stress concentration between the adjustment component and the first side portion and between the adjustment component and the second side portion, which helps to increase the service life of the adjustment component, the first side portion and the second side portion.

[0017] In some embodiments, a portion of the push rod is located in the gap, the push rod passes through the adjusting component, and is respectively connected to the supporting component and the adjusting component.

[0018] In the above scheme, a part of the push rod is arranged in the gap. After the push rod passes through the adjusting component, it is respectively connected to the supporting component and the adjusting component. On the one hand, the stability of the supporting component and the adjusting component can be improved. On the other hand, the push rod can be indirectly connected to the first side portion and the second side portion with the help of the supporting component and the adjusting component, without setting an additional connecting structure for connecting the push rod with the first side portion and the push rod with the second side portion, which is conducive to simplifying the structure of the thrust assembly.

[0019] In some embodiments, the gap between the first side and the second side has a first end and a second end oppositely arranged along the second direction, the support component is located at the second end, and the support component has a second arc surface on one side along the second direction, and the second arc surface is used to press the pole piece.

[0020] In the above scheme, the supporting component is arranged at the second end of the gap, and the supporting component has a second curved surface on the side away from the first end along the second direction. The second curved surface presses the pole piece, which can reduce the risk of stress concentration at the end points of the first side and the second side along the second direction of the pole piece, reduce the possibility of damage or even breakage of the pole piece at the end points, and help improve the accuracy of the fracture elongation test of the pole piece.

[0021] In some embodiments, the clamp includes a first clamping portion and a second clamping portion, the first clamping portion and the second clamping portion are arranged at intervals along a first direction, and the first clamping portion and the second clamping portion are used to clamp the pole piece along the first direction.

[0022] In the above scheme, the first clamping part and the second clamping part clamp the pole piece along the first direction, which can improve the stability of the pole piece on the one hand, and simplify the structure of the clamp and reduce the difficulty of fixing the pole piece on the other hand. In addition, the first clamping part and the second clamping part clamp the pole piece on opposite sides, which is also conducive to reducing the damage of the clamp to the pole piece and improving the reliability of the fracture elongation test of the pole piece.

[0023] In some embodiments, the pole piece testing device further includes a force sensor, which is disposed on the thrust assembly and is used to detect the thrust applied by the thrust assembly to the pole piece.

[0024] In the above scheme, the thrust applied by the thrust assembly to the pole piece is detected by a force sensor, and the force sensor is arranged on the thrust assembly, which helps to improve the reliability of the force sensor in detecting the thrust applied by the thrust assembly to the pole piece, thereby improving the reliability of the fracture elongation analysis of the pole piece.

[0025] In some embodiments, the pole piece testing device further includes a displacement sensor, which is disposed on the thrust assembly and is used to detect the displacement of the thrust assembly along the second direction.

[0026] In the above scheme, the displacement of the thrust assembly along the second direction is detected by the displacement sensor, and combined with the thrust detected by the force sensor, a force-displacement curve can be drawn, so that the fracture elongation of the pole piece can be analyzed according to the force-displacement curve. In addition, the displacement sensor is arranged on the thrust assembly, which helps to improve the detection reliability of the displacement sensor, thereby improving the reliability of the fracture elongation analysis of the pole piece.

[0027] In some embodiments, the pole piece testing device further includes a driving mechanism, which is connected to the push rod, and is used to drive the push rod to move along the second direction.

[0028] In the above scheme, the driving mechanism drives the push rod to move in the second direction, thereby driving the push block to move in the second direction, thereby realizing automatic driving of the thrust assembly, which can improve the stability of the thrust assembly during the pole piece stretching process and improve the reliability of the pole piece fracture elongation test. In addition, driving the thrust assembly by the driving mechanism can also save human resources and help save costs.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the structure of a pole piece testing device according to some embodiments of the present application;

[0032] Figure 2 It is a schematic diagram of the structure of the pole piece testing device of other embodiments of the present application;

[0033] Figure 3 It is a schematic diagram of the structure of the thrust assembly in the pole piece testing device of other embodiments of the present application;

[0034] Figure 4 An exploded view of a thrust assembly in a pole piece testing device according to some other embodiments of the present application;

[0035] Figure 5 It is a top view of a pole piece testing device provided in other embodiments of the present application;

[0036] Figure 6 This is another structural schematic diagram of the pole piece testing device provided in some embodiments of the present application.

[0037] The figures are as follows:

[0038] Clamping assembly 100; clamp 110; first clamping portion 111; second clamping portion 112; thrust assembly 200; push rod 210; push block 220; first side portion 221; second side portion 222; side body 223; limiting protrusion 224; locking component 225; supporting component 226; adjusting component 227; pole piece 300; gap P1; first end P11; second end P12; arc surface S1; first arc surface S11; second arc surface S12; first plane S2; guide surface S21; first direction X; second direction Y; third direction Z. DETAILED DESCRIPTION

[0039] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0040] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0041] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0042] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0044] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0045] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0046] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0047] A battery cell is the smallest unit that makes up a battery. A battery cell includes an end cap, a housing, an electrode assembly, and other functional components.

[0048] The end cap is a component that covers the opening of the shell to isolate the internal environment of the battery cell from the external environment. The shell is a component used to cooperate with the end cap to form the internal environment of the battery cell, and the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components.

[0049] The electrode assembly is the part where the electrochemical reaction occurs in the battery cell. One or more electrode assemblies may be contained in the housing. The electrode assembly is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute the tabs. The positive tab and the negative tab may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0050] In the development of battery technology, the performance of battery cells directly affects the overall performance of battery devices. During the use of battery cells, the pole pieces (such as positive pole pieces or negative pole pieces) inside them are prone to breakage, affecting the performance of the battery cells. For example, when the electrode assembly is a wound structure, the positive pole piece and the negative pole piece therein are prone to expansion under the action of the electrolyte when it is immersed in the electrolyte for a long time. The expansion of the pole piece at the center of the winding structure may cause the pole piece at its edge to break. Therefore, in order to optimize the performance of the battery cells and reduce the risk of pole piece breakage during the use of the battery cells, it is necessary to test the elongation at break of the pole piece.

[0051] However, in the current test device for testing the elongation at break of the pole piece, it is usually necessary to unfold and flatten the wound pole piece before conducting the tensile test. During the aforementioned unfolding and flattening process, the state and performance of the pole piece may change due to the force, and the stress state of the flattened pole piece when being pulled is usually different from the actual stress state of the pole piece in the wound and bent state in the battery cell. These factors may affect the accuracy of the elongation at break test of the pole piece.

[0052] In order to solve at least part of the above-mentioned technical problems, an embodiment of the present application provides a pole piece testing device, including a clamping assembly and a thrust assembly, the clamping assembly includes two clamps, the two clamps are arranged at intervals along a first direction, and are respectively used to clamp the two ends of the pole piece; the thrust assembly includes a push rod and a push block connected to the push rod, the push rod is used to drive the push block to move along a second direction, the push block includes an arcuate surface, the arcuate surface is used to press the pole piece, and the second direction is arranged to intersect with the first direction. In the above scheme, the two clamps are arranged at intervals along the first direction, and the thrust assembly includes a push rod and a push block connected to the push rod. When the two clamps respectively clamp the two ends of the pole piece, the push rod drives the push block to move along the second direction. The arc surface of the push block can press the pole piece during the movement, so that the pole piece is stretched in a bent state. On the one hand, there is no need to unfold and flatten the wound pole piece before stretching, which can avoid changes in the state and performance of the pole piece during the unfolding and flattening process. On the other hand, by stretching the pole piece in the bent state, the actual stress state of the pole piece when it is wound and set inside the battery cell can be simulated to a certain extent, thereby improving the accuracy of the pole piece's fracture elongation test.

[0053] The pole piece testing device provided in the embodiment of the present application is described below with reference to the accompanying drawings.

[0054] See also Figure 1 and Figure 2In the first aspect, an embodiment of the present application provides a pole piece testing device, including a clamping assembly 100 and a thrust assembly 200. The clamping assembly 100 includes two clamps 110, which are arranged at intervals along a first direction X and are respectively used to clamp two ends of a pole piece 300; the thrust assembly 200 includes a push rod 210 and a push block 220 connected to the push rod 210, the push rod 210 is used to drive the push block 220 to move along a second direction Y, the push block 220 includes an arcuate surface S1, the arcuate surface S1 is used to press the pole piece 300, and the second direction Y is arranged to intersect with the first direction X.

[0055] The first direction X and the second direction Y may be two intersecting directions. Further, the first direction X and the second direction Y may be two directions perpendicular to each other.

[0056] In the clamping assembly 100, the clamp 110 is a component used to clamp the pole piece 300 along the thickness direction of the pole piece 300 to limit the pole piece 300. The structure of the clamp 110 can be various. For example, the clamp 110 can include two clamping parts, and the two clamping parts are respectively arranged on opposite sides of the pole piece 300 along the thickness direction of the pole piece 300 to clamp the pole piece 300 together. The clamp 110 can be a manual clamp or an electric or pneumatic clamp. The two clamps 110 are arranged at intervals along the first direction X, and the two clamps 110 can respectively clamp the opposite ends of the pole piece 300 to fix the pole piece 300.

[0057] It should be noted that the pole piece 300 fixed by the two clamps 110 can be in a bent state. Specifically, before the test, the pole piece 300 wound in the battery cell can be cut to obtain a portion of the pole piece 300 in the aforementioned wound pole piece 300 that is in a bent state, and the portion of the pole piece 300 is clamped and fixed by the two clamps 110 for subsequent fracture elongation test. In this process, since there is no need to unfold and flatten the wound pole piece 300, it is possible to avoid changes in the state and performance of the pole piece 300 during the unfolding and flattening process, which helps to improve the accuracy of the fracture elongation test of the pole piece 300.

[0058] The thrust assembly 200 includes a push rod 210 and a push block 220 connected to the push rod 210. The push rod 210 is a component used to drive the push block 220 to move along the second direction Y. The push rod 210 can be set at any position of the push block 220, for example, the push rod 210 can be set at one side of the push block 220 along the second direction Y, or can be set at one side of the push block 220 along the first direction X. There are many ways to drive the push rod 210, for example, the push rod 210 can be connected to a driving mechanism, and the push block 220 can be driven to move under the automatic drive of the driving mechanism, or the push rod 210 can be driven manually.

[0059] The push block 220 is a component used to press the pole piece 300 so that the pole piece 300 is stretched, deformed or even broken. There are various structures of the push block 220. For example, the push block 220 can be an integrally formed structure, or the push block 220 can also be composed of a plurality of components that are separately arranged. When the push block 220 moves along the second direction Y driven by the push rod 210, the pole piece 300 can be stretched until it breaks under the action of the push block 220. The push block 220 includes an arcuate surface S1, the curvature of the arcuate surface S1 can be adapted to the curvature of the bending of the pole piece 300, and the arcuate surface S1 can press the pole piece 300, so that the stress distribution between the push block 220 and the pole piece 300 is relatively uniform, reducing the risk of the pole piece 300 breaking due to stress concentration, and can improve the accuracy of the fracture elongation test of the pole piece 300.

[0060] It can be known that in the process of pressing the pole piece 300 by the push block 220 to stretch the pole piece 300, the pole piece 300 is in a bent state, which can simulate the actual stress state of the pole piece 300 when it is wound inside the battery cell to a certain extent, thereby improving the accuracy of the fracture elongation test of the pole piece 300.

[0061] In addition, the pole piece testing device may further include a force sensor and a displacement sensor. The force sensor may be used to detect the thrust applied by the push block 220 to the pole piece 300, and the displacement sensor may be used to detect the displacement of the push block 220 in the second direction Y. By recording the force-displacement curve, the fracture elongation of the pole piece 300 is analyzed. There may be various locations for setting the force sensor and the displacement sensor. For example, the force sensor may be set on the push rod 210 or the push block 220 of the thrust assembly 200, and the displacement sensor may be set on the push rod 210 or the push block 220 of the thrust assembly 200, or may be set on other structures of the pole piece testing device.

[0062] Optionally, the pole piece testing device may further include a base, and the clamping assembly 100 and the thrust assembly 200 may be disposed on the base. The base supports structures such as the clamping assembly 100 and the thrust assembly 200, thereby improving the structural compactness and stability of the pole piece testing device.

[0063] See also Figure 3 In some embodiments, the push block 220 includes a first side portion 221 and a second side portion 222 arranged along a first direction X, the first side portion 221 and the second side portion 222 both include a first plane S2 and a first curved surface S11, the first plane S2 of the first side portion 221 and the first plane S2 of the second side portion 222 are arranged opposite to each other in the first direction X, the first curved surface S11 of the first side portion 221 and the first curved surface S11 of the second side portion 222 constitute at least a portion of the curved surface S1, and in the first direction X, the distance between the first side portion 221 and the second side portion 222 can be adjusted.

[0064] The first side portion 221 and the second side portion 222 are arranged relatively spaced apart in the first direction X. The first side portion 221 and the second side portion 222 both include a first plane S2 and a first curved surface S11. The first plane S2 of the first side portion 221 and the first plane S2 of the second side portion 222 are arranged relatively in the first direction X, that is, the first plane S2 of the first side portion 221 is located at a side of the first side portion 221 close to the second side portion 222 along the first direction X, and the first plane S2 of the second side portion 222 is located at a side of the second side portion 222 close to the first side portion 221 along the first direction X. In addition, the first side portion 221 and the second side portion 222 may further include a second plane, a third plane and a fourth plane, the second plane and the third plane may be two opposite surfaces of the corresponding side portions in the third direction Z, and the fourth plane may be a side surface of the corresponding side portion in the second direction Y away from the first curved surface S11.

[0065] The first curved surface S11 may include a side surface of the first side portion 221 or the second side portion 222 along the second direction Y. Further, the first curved surface S11 of the first side portion 221 may also include at least a portion of the surface of the first side portion 221 away from the second side portion 222 along the first direction X, and the first curved surface S11 of the second side portion 222 may also include at least a portion of the surface of the second side portion 222 away from the first side portion 221 along the first direction X. The first curved surface S11 of the first side portion 221 and the first curved surface S11 of the second side portion 222 together constitute at least a portion of the curved surface S1, which may refer to: the first curved surface S11 of the first side portion 221 and the first curved surface S11 of the second side portion 222 constitute all or part of the curved surface S1. When the first curved surface S11 of the first side portion 221 and the first curved surface S11 of the second side portion 222 constitute a portion of the curved surface S1, the push block 220 may also include other structures having a curved surface.

[0066] There are many ways to adjust the distance between the first side portion 221 and the second side portion 222 in the first direction X. For example, the first side portion 221 and the second side portion 222 may be connected by a connection structure, and the connection structure may be an automated mechanism such as a cylinder or a hydraulic cylinder, so that the distance between the first side portion 221 and the second side portion 222 in the first direction X can be adjusted by means of the connection structure. Alternatively, pads may be provided on the first side portion 221 and the second side portion 222, and the distance between the two may be adjusted by replacing pads of different sizes.

[0067] In the above scheme, the distance between the first side portion 221 and the second side portion 222 in the first direction X is adjustable, that is, the width of the push block 220 in the first direction X is adjustable. By adjusting the distance between the first side portion 221 and the second side portion 222 in the first direction X, the width of the push block 220 in the first direction X can be changed, so that the push block 220 can be adapted to pole pieces 300 of different models and sizes, so as to improve the application range of the pole piece testing device, which is beneficial to reduce the cost of the pole piece testing device compared to replacing different thrust assemblies 200 to adapt them to different pole pieces 300.

[0068] Please continue reading Figure 3 In some embodiments, the first side portion 221 and the second side portion 222 both include a side body 223 and a limiting protrusion 224, the limiting protrusion 224 is arranged on one side of the side body 223 along a third direction Z, and the third direction Z is respectively perpendicular to the first direction X and the second direction Y, the push block 220 also includes a locking component 225, the locking component 225 is provided with at least two limiting holes, and the limiting protrusion 224 of the first side portion 221 and the limiting protrusion 224 of the second side portion 222 are respectively inserted into the at least two limiting holes.

[0069] Specifically, the side body 223 may include the above-mentioned first plane S2 and the first curved surface S11, and the limiting protrusion 224 is arranged on one side of the side body 223 along the third direction Z, and it protrudes relative to the surface of the side body 223 in the third direction Z. The limiting protrusion 224 can have various shapes, for example, the limiting protrusion 224 can be cylindrical, or can also be other shapes such as a square body. On the same side body 223, the number of limiting protrusions 224 can be one or more. When the number of limiting protrusions 224 on the same side body 223 is multiple, the number of limiting protrusions 224 on the two side bodies 223 can be the same, and each limiting protrusion 224 on the two side bodies 223 is locked one-to-one by a corresponding locking component 225. Optionally, the limiting protrusions 224 on the two side bodies 223 can be arranged relatively to each other in the first direction X. In this case, the locking component 225 can extend approximately along the first direction X, thereby reducing the difficulty of assembling the locking component 225 and the corresponding limiting protrusions 224.

[0070] The locking component 225 is provided with at least two limiting holes, which extend along the third direction Z. The shape of the limiting holes can be adapted to the shape of the limiting protrusion 224 to facilitate assembly and reduce the risk of the limiting protrusion 224 moving in the limiting holes.

[0071] The number of the limiting holes may be two, and the limiting protrusions 224 on the two side bodies 223 may be inserted into the two limiting holes respectively, so that the two side bodies 223 can be locked in the first direction X by the locking component 225, and the two side bodies 223 are limited. It can be known that when the number of the limiting holes on the locking component 225 is two, in order to adjust the distance between the first side portion 221 and the second side portion 222 in the first direction X, locking components 225 of different lengths can be selected to lock the first side portion 221 and the second side portion 222, and the distance between the two limiting holes on the locking components 225 of different lengths is different, so that the distance between the first side portion 221 and the second side portion 222 in the first direction X is different.

[0072] Alternatively, the number of the limiting holes may be greater than two, for example, the number of the limiting holes may be three, and the limiting protrusions 224 on the two side bodies 223 may be respectively inserted into any two of the three limiting holes, so that the two side bodies 223 can be locked in the first direction X by the locking component 225, and the two side bodies 223 are limited. It can be known that at this time, the distance between the first side portion 221 and the second side portion 222 in the first direction X can be adjusted by inserting the limiting protrusions 224 on the two side bodies 223 into different limiting holes on the locking component 225.

[0073] In the above scheme, the first side portion 221 and the second side portion 222 are both provided with a side body 223 and a limiting protrusion 224 provided on one side of the side body 223 along the third direction Z. On this basis, a locking component 225 is provided with at least two limiting holes, so that the limiting protrusion 224 of the first side portion 221 and the limiting protrusion 224 of the second side portion 222 are respectively inserted into the corresponding two limiting holes, so as to lock the first side portion 221 and the second side portion 222 along the first direction X through the locking component 225. The structure is simple and the disassembly and assembly are convenient.

[0074] It should be noted that in the above scheme, in addition to adjusting the distance between the first side portion 221 and the second side portion 222 by means of the locking component 225, components such as pads may be further arranged between the first side portion 221 and the second side portion 222 to support the first side portion 221 and the second side portion 222, thereby improving the stability of the first side portion 221 and the second side portion 222.

[0075] Please continue reading Figure 3 In some embodiments, the push block 220 further includes a support component 226, which is disposed between the first side portion 221 and the second side portion 222, and is used to support the first side portion 221 and the second side portion 222 in the first direction X.

[0076] The support component 226 is a component used to support the first side portion 221 and the second side portion 222 in the first direction X, and improve the stability of the first side portion 221 and the second side portion 222. The shape and size of the support component 226 can be adapted to the gap P1 between the first side portion 221 and the second side portion 222. The support component 226 is clamped between the first side portion 221 and the second side portion 222, which is equivalent to being arranged in the gap P1 between the first side portion 221 and the second side portion 222 with an interference fit. The support component 226 can support the first side portion 221 and the second side portion 222, thereby reducing the risk of deformation of the first side portion 221 and the second side portion 222 in the process of pressing the pole piece 300, and improving the stability of the first side portion 221 and the second side portion 222.

[0077] In addition, by selecting a support component 226 with different widths in the first direction X and clamping it between the first side portion 221 and the second side portion 222, the distance between the first side portion 221 and the second side portion 222 can be changed, thereby achieving adjustment of the distance between the first side portion 221 and the second side portion 222 along the first direction X.

[0078] It can be known that in the process of supporting the first side portion 221 and the second side portion 222 by the support component 226, the first side portion 221 and the second side portion 222 can also clamp the support component 226 in the first direction X to limit the support component 226 and reduce the risk of separation of the support component 226 from the first side portion 221 and the second side portion 222.

[0079] It should be noted that, in the above solution, one side surface or both side surfaces of the support component 226 in the second direction Y may be a plane or a curved surface. The support component 226 may be arranged near the center of the gap P1 between the first side portion 221 and the second side portion 222, or the support component 226 may be arranged near one end of the gap P1 in the second direction Y. When the support component 226 is arranged near one end of the gap P1 in the second direction Y, one side surface of the support component 226 in the second direction Y may be a curved surface, which may be used to press the pole piece 300.

[0080] See also Figure 3 and Figure 4 In some embodiments, a gap P1 is formed between the first side portion 221 and the second side portion 222, and the gap P1 has a first end P11 and a second end P12 that are relatively arranged along the second direction Y. The push block 220 also includes an adjusting component 227, which is located at the first end P11 and is at least partially stuck in the gap P1. In the second direction Y, the direction from the second end P12 to the first end P11 is pointed, and the width of the adjusting component 227 along the first direction X tends to increase.

[0081] Specifically, the first side portion 221 and the second side portion 222 are spaced apart in the first direction X, and a gap P1 is formed therebetween. The gap P1 is located between the first plane S2 of the first side portion 221 and the first plane S2 of the second side portion 222. In the second direction Y, the gap P1 has a first end P11 and a second end P12 that are oppositely disposed.

[0082] The push block 220 further includes an adjusting component 227, which is a component for adjusting the width of the gap P1 in the first direction X. The adjusting component 227 is located at the first end P11, and can be clamped into the gap P1 from the first end P11. At least a portion of the adjusting component 227 is clamped into the gap P1, which may mean that a portion of the adjusting component 227 is clamped into the gap P1, while another portion is located outside the gap P1, or that all of the adjusting component 227 is clamped into the gap P1.

[0083] In the above scheme, in the second direction Y along the direction from the second end P12 to the first end P11, the width of the adjusting component 227 in the first direction X tends to increase. Therefore, by moving the adjusting component 227 in the second direction Y to control the size of the adjusting component 227 clamped in the gap P1, the width of the gap P1 in the first direction X can be changed, thereby realizing the distance adjustment between the first side portion 221 and the second side portion 222 in the first direction X. The structure is simple and the operation is convenient.

[0084] It should be noted that when the width of the gap P1 in the first direction X is adjusted by the adjusting component 227, the supporting components 226 of different thicknesses can be replaced accordingly to ensure the supporting effect of the supporting component 226 on the first side portion 221 and the second side portion 222. At the same time, the locking components 225 of different lengths can also be replaced accordingly to ensure the locking effect of the locking component 225 on the first side portion 221 and the second side portion 222.

[0085] Optionally, when the push block 220 presses against the pole piece 300, the second end P12 can be close to the pole piece 300 and the first end P11 can be away from the pole piece 300, thereby reducing the risk of interference between the adjustment component 227 and the pole piece 300, which not only helps to improve the reliability of the fracture elongation test of the pole piece 300, but also reduces the difficulty of operation when adjusting the width dimension of the gap P1 along the first direction X by adjusting the adjustment component 227.

[0086] Please continue reading Figure 4 In some embodiments, the first surface of the first side portion 221 and the first surface of the second side portion 222 both include a guide surface S21, which points from the second end P12 to the first end P11 in the second direction Y. The two guide surfaces S21 are inclined in directions away from each other, and at least a portion of the adjustment component 227 is clamped between the two guide surfaces S21.

[0087] The guide surface S21 of the first side portion 221 and the guide surface S21 of the second side portion 222 may be a part of the two opposite side surfaces of the first side portion 221 and the second side portion 222, the guide surface S21 of the first side portion 221 may be a part of the first surface of the first side portion 221, the guide surface S21 of the second side portion 222 may be a part of the first surface of the second side portion 222, and the guide surface S21 of the first side portion 221 and the guide surface S21 of the second side portion 222 are both arranged close to the first end P11, so that at least a part of the adjustment component 227 can be clamped between the two guide surfaces S21. It should be noted that at least a part of the adjustment component 227 is clamped between the two guide surfaces S21, which may mean that a part of the adjustment component 227 is located between the two guide surfaces S21, and the other part is located outside the two guide surfaces S21, or it may also mean that the entirety of the adjustment component 227 is located between the two guide surfaces S21.

[0088] In the second direction Y, along the direction from the second end P12 to the first end P11, the two guide surfaces S21 are inclined in the direction away from each other, that is, in the second direction Y, along the direction from the second end P12 to the first end P11, the distance between the two guide surfaces S21 along the first direction X gradually increases, and the width of the partial gap P1 between the two guide surfaces S21 along the first direction X gradually increases. It should be noted that the inclination angles of the two guide surfaces S21 can be adapted to the inclination angles of the two side surfaces of the adjustment component 227 in the first direction X.

[0089] In the above scheme, two guide surfaces S21 are arranged to be inclined in the direction away from each other along the direction from the second end P12 to the first end P11 in the second direction Y, so that at least a portion of the adjustment component 227 is clamped between the two guide surfaces S21. Therefore, when the width of the gap P1 along the first direction X is adjusted by moving the adjustment component 227, the guide surface S21 can play a guiding role, thereby reducing the difficulty of adjusting the adjustment component 227. In addition, when at least a portion of the adjustment component 227 is clamped between the two guide surfaces S21, the two side surfaces of the adjustment component 227 in the first direction X can be respectively fitted with the two guide surfaces S21, thereby reducing the risk of stress concentration between the adjustment component 227 and the first side portion 221 and between the adjustment component 227 and the second side portion 222, which helps to improve the service life of the adjustment component 227, the first side portion 221 and the second side portion 222.

[0090] See also Figure 5 In some embodiments, a portion of the push rod 210 is located in the gap P1, and the push rod 210 passes through the adjusting component 227 and is connected to the supporting component 226 and the adjusting component 227 respectively.

[0091] Specifically, the push rod 210 can extend approximately along the second direction Y, a portion of the push rod 210 can extend from the first end P11 to the gap P1, and another portion is located outside the gap P1. It can be known that in the second direction Y, the adjustment component 227 is located at the first end P11 of the gap P1, and the support component 226 is located on the side of the adjustment component 227 away from the first end P11, so the push rod 210 can pass through the adjustment component 227 along the second direction Y, and then extend to connect with the support component 226.

[0092] There are many ways to connect the push rod 210 to the support member 226 and the push rod 210 to the adjustment member 227. For example, the push rod 210 can be connected to the support member 226 and the adjustment member 227 respectively by means of bolts, nuts and other structures. The ways to connect the push rod 210 to the support member 226 and the ways to connect the push rod 210 to the adjustment member 227 can be the same or different. Optionally, the push rod 210 and the support member 226 are detachably connected, which helps to replace the support member 226 when the distance between the first side portion 221 and the second side portion 222 changes.

[0093] In the above scheme, a part of the push rod 210 is arranged in the gap P1. After the push rod 210 passes through the adjusting component 227, it is connected to the supporting component 226 and the adjusting component 227 respectively. On the one hand, the stability of the supporting component 226 and the adjusting component 227 can be improved. On the other hand, the push rod 210 can be indirectly connected to the first side portion 221 and the second side portion 222 with the help of the supporting component 226 and the adjusting component 227, without setting an additional connecting structure for connecting the push rod 210 with the first side portion 221 and the push rod 210 with the second side portion 222, which is conducive to simplifying the structure of the thrust assembly 200.

[0094] Please continue reading Figure 4 and Figure 5 In some embodiments, the gap P1 between the first side portion 221 and the second side portion 222 has a first end P11 and a second end P12 that are relatively arranged along the second direction Y, the support component 226 is located at the second end P12, and the support component 226 has a second arc surface S12 on one side along the second direction Y, and the second arc surface S12 is used to press the pole piece 300.

[0095] The supporting component 226 is located at the second end P12. At this time, the supporting component 226 has a second arc surface S12 on the side away from the first end P11 along the second direction Y. The second arc surface S12 can be connected to the first arc surface S11 of the first side portion 221 and the first arc surface S11 of the second side portion 222 on both sides in the first direction X. At this time, the first arc surface S11 of the first side portion 221, the first arc surface S11 of the second side portion 222 and the side surface of the supporting component 226 away from the first end P11 along the second direction Y together constitute the arc surface S1 of the pushing block 220 to jointly press the pole piece 300.

[0096] In the above scheme, the support component 226 is arranged at the second end P12 of the gap P1, and the support component 226 has a second curved surface S12 on the side away from the first end P11 along the second direction Y. The second curved surface S12 presses the pole piece 300, which can reduce the risk of stress concentration at the endpoints of the first side 221 and the second side 222 along the second direction Y of the pole piece 300, reduce the possibility of damage or even fracture of the pole piece 300 at the endpoint, and help to improve the accuracy of the fracture elongation test of the pole piece 300.

[0097] See also Figure 6 In some embodiments, the clamp 110 includes a first clamping portion 111 and a second clamping portion 112, the first clamping portion 111 and the second clamping portion 112 are arranged at intervals along the first direction X, and the first clamping portion 111 and the second clamping portion 112 are used to clamp the pole piece 300 along the first direction X.

[0098] The first clamping portion 111 and the second clamping portion 112 are arranged at intervals along the first direction X, and the spacing space therebetween can be used to accommodate the pole piece 300. The first clamping portion 111 and the second clamping portion 112 can be located on opposite sides of the pole piece 300 along the thickness direction of the corresponding part of the pole piece 300 to limit the pole piece 300.

[0099] There are many ways for the first clamping portion 111 and the second clamping portion 112 to clamp the pole piece 300. Optionally, the first clamping portion 111 and the second clamping portion 112 can be connected to the base respectively, and at least one of the first clamping portion 111 and the second clamping portion 112 can be movably arranged relative to the other along the first direction X, so that the distance between the first clamping portion 111 and the second clamping portion 112 can be adjusted to clamp the pole piece 300. It should be noted that at least one of the first clamping portion 111 and the second clamping portion 112 can be movably arranged relative to the other along the first direction X, which can refer to the first clamping portion 111 or the second clamping portion 112 being movably arranged along the first direction X, and can also refer to the first clamping portion 111 and the second clamping portion 112 being movably arranged along the first direction X. There are many ways to movably arrange at least one of the first clamping portion 111 and the second clamping portion 112 along the first direction X. For example, at least one of the first clamping portion 111 and the second clamping portion 112 can be connected to the base through a structure such as a cylinder or a hydraulic cylinder, so as to move along the first direction X under the drive of the structure such as the cylinder or the hydraulic cylinder. Optionally, the first clamping portion 111 and the second clamping portion 112 can also be connected through a structure such as a bolt or a nut to improve the clamping reliability of the electrode sheet 300.

[0100] In the above solution, the pole piece 300 is clamped along the first direction X by the first clamping portion 111 and the second clamping portion 112, which can improve the stability of the pole piece 300 on the one hand, and simplify the structure of the clamp 110 on the other hand, thereby reducing the difficulty of fixing the pole piece 300. In addition, the first clamping portion 111 and the second clamping portion 112 are clamped on opposite sides of the pole piece 300, which is also conducive to reducing the damage of the clamp 110 to the pole piece 300 and improving the reliability of the fracture elongation test of the pole piece 300.

[0101] In some embodiments, the pole piece testing device further includes a force sensor, which is disposed on the thrust assembly 200 and is used to detect the thrust applied by the thrust assembly 200 to the pole piece 300 .

[0102] The force sensor can be any type of sensing component that can be used to detect thrust. The force sensor can be disposed on any component of the thrust assembly 200 . For example, the force sensor can be disposed on the push rod 210 or on the push block 220 .

[0103] In the above scheme, the thrust applied by the thrust assembly 200 to the pole piece 300 is detected by a force sensor, and the force sensor is arranged on the thrust assembly 200, which helps to improve the reliability of the force sensor in detecting the thrust applied by the thrust assembly 200 to the pole piece 300, thereby improving the reliability of the fracture elongation analysis of the pole piece 300.

[0104] In some embodiments, the pole piece testing device further includes a displacement sensor, which is disposed on the thrust assembly 200 and is used to detect the displacement of the thrust assembly 200 along the second direction Y.

[0105] The displacement sensor may be any type of sensing component that can be used to detect the displacement of the thrust assembly 200. The displacement sensor may be disposed on any component of the thrust assembly 200. For example, the displacement sensor may be disposed on the push rod 210 or on the push block 220.

[0106] In the above solution, the displacement of the thrust assembly 200 along the second direction Y is detected by the displacement sensor, and combined with the thrust detected by the force sensor, a force-displacement curve can be drawn, so that the fracture elongation of the pole piece 300 can be analyzed according to the force-displacement curve. In addition, the displacement sensor is arranged on the thrust assembly 200, which helps to improve the detection reliability of the displacement sensor, thereby improving the reliability of the fracture elongation analysis of the pole piece 300.

[0107] In some embodiments, the pole piece testing device further includes a driving mechanism, which is connected to the push rod 210 , and is used to drive the push rod 210 to move along the second direction Y.

[0108] The structure of the driving mechanism can be various. For example, the driving mechanism can be any component that can achieve linear drive, such as a cylinder, a hydraulic cylinder, or the like. Alternatively, the driving mechanism can also be a combination of other mechanisms, such as a motor and a rack.

[0109] In the above solution, the push rod 210 is driven by the driving mechanism to move along the second direction Y, thereby driving the push block 220 to move along the second direction Y, thereby realizing the automatic driving of the thrust assembly 200, which can improve the stability of the thrust assembly 200 during the stretching process of the pole piece 300 and improve the reliability of the fracture elongation test of the pole piece 300. In addition, driving the thrust assembly 200 by the driving mechanism can also save human resources and help save costs.

[0110] In some embodiments, an embodiment of the present application provides a pole piece testing device, including a clamping assembly 100 and a thrust assembly 200, the clamping assembly 100 includes two clamps 110, the two clamps 110 are arranged at intervals along a first direction X, and are respectively used to clamp the two ends of the pole piece 300; the thrust assembly 200 includes a push rod 210 and a push block 220 connected to the push rod 210, the push rod 210 is used to drive the push block 220 to move along a second direction Y, the push block 220 includes an arc surface S1, the arc surface S1 is used to press the pole piece 300, and the second direction Y is arranged to intersect with the first direction X. The push block 220 includes a first side portion 221 and a second side portion 222 arranged along a first direction X. The first side portion 221 and the second side portion 222 both include a first plane S2 and a first curved surface S11. The first plane S2 of the first side portion 221 and the first plane S2 of the second side portion 222 are arranged opposite to each other in the first direction X. The first curved surface S11 of the first side portion 221 and the first curved surface S11 of the second side portion 222 constitute at least a portion of the curved surface S1. In the first direction X, the distance between the first side portion 221 and the second side portion 222 can be adjusted. The first side portion 221 and the second side portion 222 both include a side portion body 223 and a limiting protrusion 224, the limiting protrusion 224 is arranged on one side of the side portion body 223 along the third direction Z, and the third direction Z is respectively perpendicular to the first direction X and the second direction Y, and the push block 220 also includes a locking component 225, the locking component 225 is provided with at least two limiting holes, and the limiting protrusion 224 of the first side portion 221 and the limiting protrusion 224 of the second side portion 222 are respectively inserted into the at least two limiting holes. The push block 220 also includes a supporting component 226, which is clamped between the first side portion 221 and the second side portion 222, and is used to support the first side portion 221 and the second side portion 222 in the first direction X. A gap P1 is formed between the first side portion 221 and the second side portion 222. The gap P1 has a first end P11 and a second end P12 that are relatively arranged along the second direction Y. The push block 220 also includes an adjusting component 227. The adjusting component 227 is located at the first end P11 and is at least partially stuck in the gap P1. In the second direction Y, the direction from the second end P12 to the first end P11 is pointed, and the width of the adjusting component 227 along the first direction X tends to increase.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pole piece testing device, characterized in that: include: A clamping assembly, comprising two clamps, the two clamps are arranged at intervals along a first direction and are respectively used to clamp two ends of a pole piece; The thrust assembly includes a push rod and a push block connected to the push rod, wherein the push rod is used to drive the push block to move along a second direction, the push block includes an arc surface, and the arc surface is used to press the pole piece, and the second direction is arranged to intersect with the first direction.

2. The pole piece testing device according to claim 1, characterized in that: The push block includes a first side portion and a second side portion arranged along the first direction, the first side portion and the second side portion each include a first plane and a first curved surface, the first plane of the first side portion and the first plane of the second side portion are arranged opposite to each other in the first direction, and the first curved surface of the first side portion and the first curved surface of the second side portion constitute at least a part of the curved surface, In the first direction, a distance between the first side portion and the second side portion is adjustable.

3. The pole piece testing device according to claim 2, characterized in that: The first side portion and the second side portion each include a side portion body and a limiting protrusion, wherein the limiting protrusion is arranged on one side of the side portion body along a third direction, and the third direction is perpendicular to the first direction and the second direction respectively. The push block further includes a locking component, the locking component is provided with at least two limiting holes, and the limiting protrusions of the first side portion and the limiting protrusions of the second side portion are respectively inserted into the at least two limiting holes.

4. The pole piece testing device according to claim 2, characterized in that: The push block further includes a supporting component, which is clamped between the first side portion and the second side portion and is used to support the first side portion and the second side portion in the first direction.

5. The pole piece testing device according to claim 4, characterized in that: A gap is formed between the first side portion and the second side portion, the gap having a first end and a second end disposed opposite to each other along the second direction, the push block further comprising an adjusting component, the adjusting component being located at the first end and at least partially stuck in the gap, In the second direction, along a direction from the second end to the first end, the width of the adjusting component along the first direction tends to increase.

6. The pole piece testing device according to claim 5, characterized in that: The first surface of the first side portion and the first surface of the second side portion both include guide surfaces, In the second direction, along the direction from the second end to the first end, the two guide surfaces are inclined toward directions away from each other, and at least a portion of the adjustment component is clamped between the two guide surfaces.

7. The pole piece testing device according to claim 5, characterized in that: A portion of the push rod is located in the gap, and the push rod passes through the adjusting component and is respectively connected to the supporting component and the adjusting component.

8. The pole piece testing device according to claim 4, characterized in that: The gap between the first side portion and the second side portion has a first end and a second end arranged opposite to each other along the second direction, the support component is located at the second end, and the support component has a second arc surface on one side along the second direction, and the second arc surface is used to press the pole piece.

9. The pole piece testing device according to any one of claims 1 to 8, characterized in that: The clamp comprises a first clamping portion and a second clamping portion, the first clamping portion and the second clamping portion are arranged at intervals along the first direction, and the first clamping portion and the second clamping portion are used to clamp the pole piece along the first direction.

10. The pole piece testing device according to any one of claims 1 to 8, characterized in that: The pole piece testing device further comprises a force sensor, which is arranged on the thrust assembly and is used to detect the thrust applied by the thrust assembly to the pole piece.

11. The pole piece testing device according to any one of claims 1 to 8, characterized in that: The pole piece testing device further comprises a displacement sensor, which is arranged on the thrust assembly and is used to detect the displacement of the thrust assembly along the second direction.

12. The pole piece testing device according to any one of claims 1 to 8, characterized in that: The pole piece testing device further comprises a driving mechanism, wherein the driving mechanism is connected to the push rod, and the driving mechanism is used to drive the push rod to move along the second direction.

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