Clamping tool and testing device comprising same

Abstract

The embodiment of the invention relates to the technical field of solar cells, and particularly provides a clamping tool and a testing device comprising the same, and the clamping tool comprises a housing which comprises a main body part, and the main body part is provided with an open side; the needle pressing part comprises a first needle pressing assembly and a second needle pressing assembly; wherein the position, corresponding to the open side, of the main body part comprises a first side part and a second side part, the first side part and the second side part are oppositely arranged, and the first pressing needle assembly and the second pressing needle assembly are arranged on the first side part and the second side part respectively; wherein the clamping tool comprises a conductive connecting part, and the first pressing needle assembly and the second pressing needle assembly are connected through the conductive connecting part. Through such a structure, the front and back surfaces of the battery piece to be tested can be short-circuited to form a path by means of the clamping tool, so that comparable test conditions are established.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and specifically provides a clamping tool and a testing device comprising the same. Background Art

[0002] HJT cells have a high theoretical limit efficiency and are one of the current development directions of high-efficiency photovoltaic modules. However, HJT cells are sensitive to ultraviolet rays (UV). It is necessary to evaluate the attenuation of HJT cells under UV light because it is closely related to the quality assurance of photovoltaic modules made of HJT cells. According to the IEC standard, the current method is to short-circuit the photovoltaic modules in the UV aging box, and then evaluate the UV attenuation of the photovoltaic modules by exposing them to UV light. However, this method requires HJT cells to be made into photovoltaic modules, so the cost is relatively high. At the same time, the size of photovoltaic modules is large, so it is often difficult to quickly evaluate the UV attenuation differences between different products using the current method.

[0003] At present, some manufacturers use the method of directly exposing HJT cells (HJT cells) to UV light to evaluate the UV resistance of the cells themselves. However, when using HJT cells for evaluation experiments, since the HJT cells are in an open circuit state, which is different from the short-circuit state of the photovoltaic components composed of HJT cells mentioned above, the UV resistance obtained based on this solution is actually difficult to directly reflect the UV resistance of the actual product, that is, it is impossible to directly evaluate the UV attenuation differences between different products. Summary of the invention

[0004] The present application aims to at least partially solve the above-mentioned technical problems and / or solve at least part of the above-mentioned technical problems. Specifically, it provides a tool / device, so that based on the tool / device, effective UV performance testing of battery cells can be carried out, and the UV attenuation differences between different products can be evaluated based on the test results.

[0005] In view of this, in a first aspect, the present application provides a clamping tool, which includes: a shell, which includes a main body part, and the main body part is formed with an open side; and a pressing needle part, which includes a first pressing needle assembly and a second pressing needle assembly; wherein the main body part includes a first side portion and a second side portion that are relatively arranged at a position corresponding to the open side, and the first pressing needle assembly and the second pressing needle assembly are respectively arranged on the first side portion and the second side portion; wherein the clamping tool includes a conductive connecting part, and the first pressing needle assembly and the second pressing needle assembly are connected through the conductive connecting part.

[0006] With such a configuration, it is possible to short-circuit the front and back sides of the battery cell to be tested to form a path with the aid of a clamping fixture, thereby establishing comparable test conditions.

[0007] For the above-mentioned clamping tool, in a possible implementation manner, the first press needle assembly and the second press needle assembly include press needles, and the press needles can abut against the surface of the battery cell to be tested.

[0008] With such a configuration, it is possible to short-circuit the front and back surfaces of the battery by the contact between the pressing pin and the battery surface.

[0009] For the above-mentioned clamping tool, in a possible implementation manner, a main grid is provided on the surface of the battery cell to be tested, and the first pressing needle assembly and the second pressing needle assembly abut against the surface of the battery cell to be tested along the length direction of the main grid.

[0010] Through such a structure, a possible clamping method for the battery cell including the main grid is provided.

[0011] For the above-mentioned clamping tool, in a possible implementation, a fine grid is provided on the surface of the battery cell to be tested, and the first press needle assembly and the second press needle assembly abut against the surface of the battery cell to be tested in a direction perpendicular to the length direction of the fine grid.

[0012] Through such a configuration, a possible clamping method for a battery cell without a main grid structure is provided.

[0013] For the above-mentioned clamping tool, in a possible implementation manner, at least a portion of the first pressing needle assembly and / or the second pressing needle assembly is provided with or forms a conductive contact portion at an end portion close to the surface of the battery cell.

[0014] With such a structure, the pressure pin can seek to establish a better contact relationship with the battery surface through the conductive contact part, such as contact with more fine grids.

[0015] For the above-mentioned clamping tool, in a possible implementation manner, the hardness of the conductive contact portion is smaller than the hardness of the end of the press needle of the first press needle assembly and / or the second press needle assembly close to the surface of the battery cell; and / or the area of ​​the conductive contact portion is larger than the area of ​​the end of the press needle of the first press needle assembly and / or the second press needle assembly close to the surface of the battery cell.

[0016] Through such a configuration, possible materials / structures of the conductive contact parts are provided.

[0017] For the above-mentioned clamping tool, in a possible implementation manner, the projection of the conductive contact portion in the horizontal plane is completely covered by the projection of the shell at the position where the conductive contact portion is arranged in the horizontal plane.

[0018] With such a structure, the conductive contact part can be effectively prevented from shielding the surface of the battery cell, that is, except for the shielding caused by the shell of the clamping tool, no new shielding is caused by the setting of the conductive contact part.

[0019] For the above-mentioned clamping tool, in a possible implementation manner, the first pressing needle assembly and the second pressing needle assembly are arranged in a manner that they can approach or move away from each other.

[0020] With such a configuration, it is possible to clamp the battery cell between the first pressing needle assembly and the second pressing needle assembly of the clamping tool or remove the battery cell from between the two.

[0021] For the above-mentioned clamping tool, in a possible implementation manner, the first pressing needle assembly and the second pressing needle assembly are provided with an elastic assembly with adjustable elastic force (applied to the pressing needle).

[0022] With such a configuration, it is possible to adjust the elastic force so that the pressing needle abuts against or leaves the surface of the battery cell (in a non-working state, it may abut against a pressing needle of another pressing needle assembly). For example, when the pressing needle abuts against the surface of the battery cell, the pressure of the pressing needle may also be adjusted.

[0023] It is understandable that those skilled in the art can determine the structural form of the elastic component, its corresponding relationship with the pressure needle, the elastic force adjustment method, etc. according to actual needs. For example, multiple pressure needles can share one or more elastic components, and the pressure needles and elastic components can also have a one-to-one correspondence. The elastic component can include one or more elastic members, such as a spring, a disc spring, etc.

[0024] For the above-mentioned clamping tool, in a possible implementation manner, the clamping tool includes: a movable part, the elastic component is arranged on the movable part; and an operating end, the operating end is operatively connected to the movable part.

[0025] With such a structure, it is possible to realize the movement of the movable part by operating the operating end (such as a knob, a button, a key), thereby synchronously adjusting the positions of multiple pressure needles in the first and / or second pressure needle assembly through the movable part.

[0026] It should be noted that the operational connection mentioned here should be understood as when the operating end issues an operation such as starting, the movable part will produce the expected movement such as driving the pressure needle to approach / move away from the surface of the battery sheet. It is understandable that those skilled in the art can determine the driving / transmission structure based on the operational connection according to actual needs, such as a combination of a motor and a screw nut mechanism / gear rack mechanism, a power cylinder (electric cylinder, air cylinder, hydraulic cylinder, etc.), any form of linear module, etc.

[0027] For the above-mentioned clamping tool, in a possible implementation, the shell includes a first part and a second part, the first pressure needle assembly and the second pressure needle assembly are respectively arranged in the first part and the second part, and the first part and the second part are arranged in a manner that they can approach / move away from each other.

[0028] Through such a structure, it is possible to clamp the battery cell between the first and second pressure needle assemblies of the clamping tool or remove the battery cell from the first and second pressure needle assemblies through the relative movement between the first and second parts. For example, the two parts can achieve relative movement in an automatic, semi-automatic or manual manner with the aid of a retractable mechanism. Exemplarily, a guide rod is provided between the two parts, and the relative movement between the first and second parts can be adjusted manually. In addition, those skilled in the art can determine the structural form of the first / second part according to actual needs. For example, the first / second part can be a plate-like structure, a shell-like structure, a block-like structure, etc., and the two parts can be the same or different.

[0029] For the above-mentioned clamping tool, in a possible implementation manner, the conductive connection portion is disposed on or formed on the shell.

[0030] Through such a configuration, a possible structural form of the clamping fixture formed by the conductive connecting part is provided.

[0031] In a second aspect, the present application provides a testing device, which includes the clamping tool described in any one of the above items.

[0032] With such a structure, it is possible to test the UV resistance of the battery cell by combining multiple (such as two or more) clamping tools.

[0033] It can be understood that the testing device has all the technical effects of the clamping fixture described in any of the above items, which will not be repeated here.

[0034] It can be seen that in the preferred embodiment of the present application, based on the cooperation of multiple clamping fixtures (such as a pair), the two opposite sides of the battery to be tested can be stably clamped. In addition, through the cooperation of the first / second pressure needle assembly of the clamping fixture and the conductive connection part, the front and back sides of the battery cell can be short-circuited to form a path. Therefore, based on the results of the UV resistance of the battery cell by the device, it can correspond well to the attenuation of the actual product (photovoltaic module containing the battery cell). In addition, the clamping fixture can ensure the consistency of the short-circuit state, so that the test results for different battery cells are comparable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0036] Figure 1 A schematic diagram showing the structure of a clamping tool according to an embodiment of the present application Figure 1 ;

[0037] Figure 2 A schematic diagram showing the assembly of a clamping tool according to an embodiment of the present application Figure 2 ;

[0038] Figure 3 A schematic diagram showing the structure of a battery cell to be tested according to the first embodiment of the present application;

[0039] Figure 4 A schematic structural diagram showing a clamping tool according to an embodiment of the present application in a state of clamping a battery cell according to the first embodiment;

[0040] Figure 5 A schematic diagram showing the structure of a pair of clamping tools according to one embodiment of the present application in a state of clamping a battery cell according to the first embodiment;

[0041] Figure 6 A schematic diagram showing the structure of a battery cell to be tested in a second embodiment of the present application;

[0042] Figure 7 A schematic diagram showing the structure of a clamping tool in a non-working state according to an embodiment of the present application; and

[0043] Figure 8 A schematic structural diagram of a pair of clamping tools according to one embodiment of the present application is shown in a state of clamping a battery cell according to a second embodiment.

[0044] List of reference numerals:

[0045] 100. Clamping tooling;

[0046] 1. Shell;

[0047] 2. Needle pressing part;

[0048] 21. First pressing needle assembly; 22. Second pressing needle assembly;

[0049] 3. Conductive connection part;

[0050] 4. Spring;

[0051] 5. Knob switch;

[0052] 6. Conductive contact part;

[0053] 200, battery cell;

[0054] 201, main grid;

[0055] 202, auxiliary gate. DETAILED DESCRIPTION

[0056] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0057] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element 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" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0058] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" 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 direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In addition, in order to better illustrate the present application, many specific details are given in the specific implementation below. Those skilled in the art should understand that the present application can also be implemented without certain specific details. In some examples, the principles and specific methods of the UV resistance test / evaluation of the cell well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0060] The following will refer to Figures 1 to 8 At least a part of the present application is described.

[0061] Main reference Figure 1 , Figure 2 , Figure 4 and Figure 5In a possible implementation, the UV resistance of the battery cell 200 to be tested can be evaluated based on a pair of clamping fixtures 100. The clamping fixture 100 mainly includes a shell 1, a pressure needle part 2 and a conductive connection part 3. The shell includes a main body part with an open side, and the main body part includes a first side part and a second side part that are relatively arranged at a position corresponding to the open side. The pressure needle part mainly includes two pressure needle assemblies (such as first pressure needle assembly 21 and second pressure needle assembly 22, respectively) arranged at the first side part and the second side part, respectively. The pressure needles of the first pressure needle assembly 21 and the second pressure needle assembly 22 (such as usually including multiple pressure needles) can be respectively abutted against two surfaces of the battery cell 200 to be tested (such as first surface (upper surface) and second surface (lower surface)). As in this example, the housing 1 includes (the housing itself) or is provided with (added on the housing) a conductive connection portion 3, and the (first and second) press pin assemblies are electrically connected through the conductive connection portion 3, so that when the battery cell is clamped in the clamping fixture 100, the front and back sides of the battery cell are short-circuited to form a path. As in this example, the conductive connection portion 3 is arranged on the inner side of the housing 1.

[0062] In one possible implementation, the (first and second) press needle assemblies can move toward / away from each other, so that when a UV aging experiment is required, the (first and second) press needle assemblies are brought close to each other so that the battery cell can be reliably clamped between the (first and second) press needle assemblies and short-circuited between the two surfaces of the battery cell. After the experiment is completed, the (first and second) press needle assemblies are moved away from each other so that the short-circuit state can be removed and the battery cell can be removed from the clamping tool. Exemplarily, after the battery cell is removed, the (first and second) press needle assemblies may or may not be in contact. Exemplarily, in a non-clamped state, the press needles at corresponding positions on the (first and second) press needle assemblies abut against each other.

[0063] In a possible implementation, the (first and second) pressure needle assemblies are provided with elastic components such as springs 4, and the pressure needles of the (first and second) pressure needle assemblies can abut against each other by means of the pre-tightening force of the springs. For example, a movable component that can drive the spring to move along its compression direction can be configured for the spring. For example, through the movement of the movable component, the pressure needle can be abutted against or separated from the surface of the battery cell / the pressure needle of another pressure needle assembly. When the pressure needle abuts against the surface of the battery cell / the pressure needle of another pressure needle assembly, the pressure of the pressure needle can be adjusted.

[0064] Exemplarily, each pressing needle is provided with a spring, one end of each of the springs is connected to the corresponding pressing needle, and the other ends are all provided on movable parts such as a connecting seat and a connecting plate. By moving the movable part along the extension and contraction direction of the spring, the pressing needle can be switched between an abutting state and a disengaged state, and the pressure of the pressing needle can be adjusted when it is in the abutting state.

[0065] It is understandable that those skilled in the art can determine the structure / component / mechanism, etc. with which the movable part realizes its activity according to actual needs. In this example, a knob switch 5 is configured on the housing 1, and the preload force of the spring configured on the pressure needle assembly can be adjusted by rotating the knob switch 5, so that the upper and lower groups of opposing pressure needles are pressed or opened against each other. By rotating the knob switch 5, the movable component can be moved, and those skilled in the art can determine the driving transmission method corresponding to the rotation of the knob switch according to actual needs. For example, it can be a gear rack mechanism, a screw nut mechanism, etc. In addition, the activity of the movable part can also be awakened by methods such as pressing, contactless operation, etc.

[0066] In addition, the shell can be configured to include two parts (a first part and a second part), and the relative positions of the two pressure needle assemblies can be adjusted by relative movement between the first part and the second part, so that the pressure needle can switch between the abutment state and the disengagement state, and the pressure of the pressure needle can be adjusted when in the abutment state. Similarly, those skilled in the art can determine the activity mode of the first part and the second part and the structure / component / mechanism used to achieve their relative movement and activity based on actual needs. For example, the activity mode of the first part and the second part can be: one of them is movable and the other is relatively stationary; both are movable, but the activity mode between the two can be independent of each other or synchronous, so as to synchronize the positions, and the driving / transmission mechanisms used for the activities of the two can be the same or different. In addition, the activity can be realized manually, semi-automatically, or automatically.

[0067] Based on the above structure, a pair of clamping fixtures can be used to implement the UV resistance performance test of the battery cell. For example, the UV resistance performance test device includes two clamping fixtures, the open sides of the two clamping fixtures face each other, and the multiple pressure pins in the first / pressure pin assembly on each clamping fixture are arranged along the length direction of the main grid (the direction perpendicular to the length direction of the fine grid). Under normal conditions (non-working conditions), by rotating the knob switch, the upper and lower opposing pressure pin assemblies are in a state of contact with each other under the action of the spring. For example, the material of the pressure pin can be copper, silver, gold and other metals with good high conductivity or alloys composed of metals. The two pressure pin assemblies are connected by a conductive connecting part. Similar to the pressure pin, the material of the conductive connecting part can be copper, silver, gold and other metals with good high conductivity or alloys composed of metals.

[0068] When the cell needs to be subjected to UV aging test, the knob switch is turned to open the two pressing needle assemblies of each clamping fixture, so that a set of opposite sides of the cell (such as two sides along the length direction) can be respectively inserted between the two pressing needle assemblies of a pair of clamping fixtures. After that, the two pressing needle assemblies are brought closer to each other by turning the knob switch, so that the cell can be clamped from the two ends of the cell by a pair of clamping fixtures.

[0069] Embodiment 1:

[0070] Main reference Figures 3 to 5 In a possible implementation, for a battery cell (MBB, SMBB) having a main grid (comprising multiple main grids 201 and multiple fine grids 202), the position of the pressure pin should correspond to the position of the main grid on the battery cell. At this time, the two pressure pin assemblies can be in close contact with the main grids 201 on the upper and lower surfaces of the battery cell 200 to be tested, and a path can be formed between the upper and lower surfaces of the battery cell 200 by short-circuiting the pressure pin assemblies (21, 22) and the conductive connection part 3.

[0071] For example, after the two pressing needle assemblies are switched to a state of abutting the main grid (which can be called a closed state) by rotating the knob switch, the pressure of the two pressing needle assemblies on the surface of the battery cell can be adjusted by adjusting the knob switch, so as to ensure that the pressing needles can reliably and closely contact the main grid of the battery cell to achieve electrical connection, while not causing phenomena such as crushing the battery cell due to the establishment of the contact relationship, thereby ensuring the integrity of the battery cell.

[0072] Embodiment 2:

[0073] Main reference Figures 6 to 8In a possible implementation, for a cell (0BB) without a main grid (including only a plurality of thin grids 202), in order to improve the applicability of the clamping fixture 100, a conductive contact portion 6 may be provided at the ends of the two pressing pin assemblies of the clamping fixture 100 close to each other (the ends in contact with the surface of the cell), and the conductive contact portion may be integrally formed with the pressing pin or fixedly provided on the pressing pin. The structural form of the clamping fixture, the method of clamping the cell by a pair of clamping fixtures, etc. are substantially the same as those in Example 1, and will not be described in detail here.

[0074] In a possible implementation, the hardness of the conductive contact portion 6 is less than that of the pressing needle, such as copper, gold and other softer materials. In this way, when the two groups of pressing needles are respectively close to the two surfaces of the battery cell 200 by rotating the knob switch 5, the conductive contact portion 6 can be in close contact with the corresponding surface of the battery cell. Specifically, the surface of the battery cell 200 is inevitably uneven because the secondary grid 202 (usually several to tens of μm) is printed. Since the conductive contact portion 6 is soft in texture, it will produce a certain deformation under the pressure of the pressing needle, so that it is expected to better adapt to the surface structure of the battery cell 200. On this basis, the conductive contact portion 6 can obtain a good contact effect with the surface of the battery cell 200, such as the conductive contact portion can be a block structure, a disk / plate / sheet structure, a columnar structure, a spherical structure, etc.

[0075] In a possible implementation, a conductive contact portion 6 with a larger area can be provided. For example, the size of the conductive contact portion corresponding to each pressing pin in the horizontal plane should be larger than the radial size of the end of the pressing pin. Based on this, the conductive contact portion 6 can be in contact with more sub-grids 202, thereby increasing the contact area and improving the conductive effect. For example, the conductive contact portion 6 can be a conductive metal foil. For example, assuming that the conductive metal foil is a circular structure, it can be shown that the diameter of the conductive contact portion is larger than the diameter of the end of the pressing pin; assuming that the conductive metal foil is a rectangular structure, it can be shown that the width of the rectangular structure is larger than the diameter of the end of the pressing pin. However, since the setting of the conductive contact portion will actually cause the surface of the battery cell to be blocked in the experiment, in order to ensure the experimental effect, the projection of the conductive contact portion (including the current conductive metal foil and the aforementioned situation of using a softer material in a deformed state) in the horizontal plane should be completely covered by the shell at the position where it is set, that is: try not to cause new blocking due to the addition of the conductive contact portion.

[0076] Obviously, those skilled in the art can adopt a conductive contact part with one of the above properties to form the clamping tool of the present application according to actual needs.

[0077] It is understandable that the conductive contact portion may be provided for all or part of the pressure pins, and the conductive contact portions corresponding to the plurality of pressure pins may be provided separately, connected to each other, or integrally formed. Exemplarily, the pressure pins include a plurality of groups, the conductive contact portions of each group of pressure pins are integrally formed or fixedly connected, and the conductive contact portions of different groups of pressure pins are provided separately from each other.

[0078] As in this example, the conductive contact part is a conductive metal copper foil with a rectangular structure and multiple press pins in each press pin assembly share one conductive contact part (or the conductive metal parts corresponding to the multiple press pins are fixedly connected or integrally formed), that is, the conductive contact part in this example combines the two properties of soft hardness and large area.

[0079] In addition, in order to better adapt to the experimental requirements of both types of battery cells with and without main grids, the conductive contact portion can also be arranged at the end of the pressing needle in a removable manner. For example, when the UV aging experiment is carried out for a long time or only on battery cells with main grids, the conductive contact portion can be removed from the end of the pressing needle.

[0080] It can be seen that in the preferred embodiment of the present application, a pair of clamping fixtures can be used to form a good short circuit between the front and back sides of the battery cell. Specifically, through the two pressure needle assemblies of the clamping fixture and the conductive connection part between the two, the pressure needle is reliably pressed against the grid line of the battery cell to form a good contact, so that the front and back sides of the battery cell can be short-circuited to form a path. Based on this, when the battery cell is subjected to a UV aging experiment, the short-circuit state between different samples (battery cells to be tested) can be guaranteed to be consistent, so the experimental results for different samples can be guaranteed to be comparable.

[0081] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A clamping tool, characterized in that: The clamping tool comprises: a housing including a body portion formed with an open side; and The needle pressing part comprises a first needle pressing assembly and a second needle pressing assembly; Wherein, the main body portion includes a first side portion and a second side portion which are arranged opposite to each other at a position corresponding to the open side, and the first pressing needle assembly and the second pressing needle assembly are respectively arranged at the first side portion and the second side portion; Wherein, the clamping tool comprises a conductive connecting part, and the first pressing needle assembly and the second pressing needle assembly are connected through the conductive connecting part.

2. The clamping tool according to claim 1, characterized in that: The first pressing needle assembly and the second pressing needle assembly include pressing needles, and the pressing needles can abut against the surface of the battery cell to be tested.

3. The clamping tool according to claim 2, characterized in that: A main grid is arranged on the surface of the battery cell to be tested, and the first pressing needle assembly and the second pressing needle assembly abut against the surface of the battery cell to be tested along the length direction of the main grid.

4. The clamping tool according to claim 2, characterized in that: A fine grid is arranged on the surface of the battery cell to be tested, and the first pressing needle assembly and the second pressing needle assembly abut against the surface of the battery cell to be tested along a direction perpendicular to the length direction of the fine grid.

5. The clamping tool according to claim 4, characterized in that: At least a portion of the first pressing needle assembly and / or the second pressing needle assembly is provided with or formed with a conductive contact portion at an end portion close to the surface of the battery cell.

6. The clamping tool according to claim 5, characterized in that: The hardness of the conductive contact portion is less than the hardness of the end of the pressing needle of the first pressing needle assembly and / or the second pressing needle assembly close to the surface of the battery cell; and / or The area of ​​the conductive contact portion is larger than the area of ​​the end of the pressing needle of the first pressing needle assembly and / or the second pressing needle assembly close to the surface of the battery cell.

7. The clamping tool according to claim 6, characterized in that: The projection of the conductive contact portion in the horizontal plane is completely covered by the projection of the housing at the position where the conductive contact portion is arranged in the horizontal plane.

8. The clamping tool according to claim 2, characterized in that: The first pressing needle assembly and the second pressing needle assembly are arranged in a manner so as to be able to approach or move away from each other.

9. The clamping tool according to claim 8, characterized in that: The first pressing needle assembly and the second pressing needle assembly are provided with elastic components with adjustable elastic force.

10. The clamping tool according to claim 9, characterized in that: The clamping tool comprises: an active portion, the elastic component being disposed on the active portion; and An operating end is operatively connected to the movable part.

11. The clamping tool according to claim 8, characterized in that: The housing includes a first part and a second part, the first pressing needle assembly and the second pressing needle assembly are respectively arranged at the first part and the second part, and the first part and the second part are arranged in a manner of being able to approach or move away from each other.

12. The clamping tool according to claim 1, characterized in that: The conductive connection portion is disposed on or formed on the housing.

13. A testing device, characterized in that: The device comprises a plurality of clamping fixtures according to any one of claims 1 to 12.

Images