Clamp device and welding equipment

Abstract

The embodiment of the utility model provides a clamp device and welding equipment, the clamp device is used in a welding process of a cylindrical battery monomer, the cylindrical battery monomer comprises an electrode assembly and a current collecting disc, the electrode assembly is provided with a tab, and the clamp device comprises a positioning mechanism and a pressing mechanism. The positioning mechanism is used for positioning the electrode assembly from the first position to the second position. The pressing mechanism comprises a seat body and a plurality of pressing units arranged on the seat body. Each pressing unit comprises a distance measuring structure and a pressing structure which are electrically connected. Wherein the distance measuring structure is used for measuring distance information between the distance measuring structure and the current collecting plate when the current collecting plate is located on the tab at the second position, and the pressing structure is configured to enable areas, corresponding to the pressing units, of the current collecting plate to be pressed on the tab according to the distance information. According to the invention, the welding quality of the collector plate and the tab in the single cylindrical battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a clamp device and welding equipment. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, 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, how to improve the welding quality of the collector plate and the tab in the cylindrical battery cell is a research direction in battery technology. Utility Model Content

[0004] The present application provides a clamp device and a welding device, which can improve the welding quality of a current collecting plate and a pole ear in a cylindrical battery cell.

[0005] An embodiment of the present application provides a clamp device for use in a welding process of a cylindrical battery cell, wherein the cylindrical battery cell includes an electrode assembly and a current collector, wherein the electrode assembly has a pole lug, and the clamp device includes a positioning mechanism and a pressing mechanism. The positioning mechanism is used to position the electrode assembly from a first position to a second position. The pressing mechanism includes a seat body and a plurality of pressing units disposed on the seat body, wherein the pressing unit includes an electrically connected distance measuring structure and a pressing structure. The distance measuring structure is used to measure the distance information between the current collector and itself when the current collector is located on the pole lug in the second position, and the pressing structure is configured to press the areas of the current collector corresponding to the plurality of pressing units respectively onto the pole lug according to the distance information.

[0006] In the above technical scheme, the clamp device of the embodiment of the present application sets a distance measuring structure, and uses the distance measuring structure to measure the distance information between the current collecting plate and itself. The pressing structure presses different areas of the current collecting plate corresponding to multiple pressing units on the pole ear according to the distance information. In this way, different parts of the current collecting plate can be pressed, thereby improving the uniformity of pressure on different parts of the current collecting plate, reducing the problem of cold welding between the current collecting plate and the pole ear, and improving the welding quality.

[0007] In some embodiments, a plurality of pressing units are spaced apart, the distance between the distance measuring structure and the pressing structure in the pressing unit is h1, the distance between any two adjacent pressing units is h2, and h1 and h2 satisfy: h1<h2.

[0008] In the above technical solution, the distance between the distance measuring structure and the pressing structure in the pressing unit can be made smaller, so that the data measured by the distance measuring structure is more accurate and can basically represent the distance between the pressing structure and the collecting plate, thereby making the pressing stroke of the pressing structure more accurate and improving the pressing effect.

[0009] In some embodiments, the pressing structure includes an output shaft for abutting against the collecting plate, and the entire distance measuring structure is embedded in the output shaft.

[0010] In the above technical solution, the distance measuring structure is integrated into the output shaft, which can save space and improve space utilization. In addition, the distance information measured by the distance measuring structure is the distance between the output shaft and the collector plate, so that according to the distance information, the entire downward stroke of the output shaft is more accurate and the pressing effect is better.

[0011] In some embodiments, the output shaft has a first surface for pressing against the collecting plate, and a distance is formed between the distance measuring structure and the plane where the first surface is located.

[0012] In the above technical solution, the protrusion of the ranging structure during use can be reduced, thereby protecting the ranging structure.

[0013] In some embodiments, a plurality of pressing units are arranged at intervals along the circumferential direction of the seat body.

[0014] In the above technical solution, since the current collecting plate is roughly circular, the pressing units are arranged in an annular shape at intervals, which can better match the shape of the current collecting plate and improve the pressing effect. In addition, more pressing units can be arranged.

[0015] In some embodiments, the plurality of pressing units apply the pressing force independently of each other.

[0016] In the above technical solution, the pressing can be carried out specifically according to the conditions of different parts of the collecting plate, so that the object to be pressed is more accurate and the pressing effect is better.

[0017] In some embodiments, the ranging structure includes a laser sensor or an ultrasonic sensor, and / or the pressing structure includes a motor.

[0018] In the above technical solution, the laser sensor or ultrasonic sensor is more reliable to use and is more suitable for a shorter pressing stroke. The motor has a higher precision and can meet the pressing accuracy required by the pressing structure.

[0019] In some embodiments, the positioning mechanism includes a driving member and a supporting member, the supporting member is used to support the electrode assembly, and the driving member is used to drive the supporting member to rise so as to position the electrode assembly from the first position to the second position.

[0020] In the above technical solution, the driving member is configured to drive the supporting member to rise, which can reduce the downward pressing stroke of the pressing mechanism, thereby improving the pressing efficiency.

[0021] In some embodiments, the carrier has a carrying surface for carrying the electrode assembly, and the carrier also includes a limiting portion, which is connected to the carrying surface and is configured to be disposed on at least a portion of the outer circumference of the electrode assembly and to limit the electrode assembly.

[0022] In the above technical solution, the limiting part is used to limit the electrode assembly to reduce the displacement of the electrode assembly during the rising process, the pressing structure pressing process and the subsequent welding process, thereby improving the welding quality.

[0023] In some embodiments, the clamping device also includes a limit member, which is arranged above the carrier and is configured to surround a portion of the outer circumference of the electrode assembly and limit the electrode assembly. The limit member has an opening in the surrounding direction, and the opening allows the electrode assembly to enter the limit member.

[0024] In the above technical solution, a limiter is provided to reduce the displacement of the electrode assembly during the ascending process and the subsequent welding process, thereby improving the welding quality.

[0025] In some embodiments, the clamp device further includes a frame, and the positioning mechanism and the pressing mechanism are both connected to the frame.

[0026] In the above technical solution, a frame is provided to connect the pressing mechanism and the positioning mechanism together, thereby eliminating the need for additional installation of the pressing mechanism and enabling the positioning mechanism and the pressing mechanism to be aligned in position.

[0027] In a second aspect, an embodiment of the present application further provides a welding device, comprising the above-mentioned clamp device and a welding device, wherein the welding device is used to weld the collecting plate to the pole ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 the drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of welding equipment provided in some embodiments of the present application;

[0030] Figure 2 A schematic diagram of a structure of a clamp device provided in some embodiments of the present application;

[0031] Figure 3 Another structural schematic diagram of a clamp device provided in some embodiments of the present application;

[0032] Figure 4A schematic diagram of the structure of a pressing mechanism in a clamp device provided in some embodiments of the present application;

[0033] Figure 5 for Figure 4 The pressing mechanism is shown in a cross-sectional view at AA.

[0034] The reference numerals of the specific embodiments are as follows:

[0035] 100. welding equipment; 200. fixture device; 300. welding device;

[0036] 1. Positioning mechanism; 11. Driving member; 12. Bearing member; 121. Bearing surface; 122. Limiting portion;

[0037] 2. Pressing mechanism; 21. Base; 22. Pressing unit; 221. Distance measuring structure; 222. Pressing structure; 223. Output shaft; 224. First surface;

[0038] 3. Limiting parts;

[0039] 5. Electrode assembly;

[0040] 6. Collecting plate. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0043] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0047] The term “plurality” used in this application refers to two or more (including two).

[0048] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0049] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0050] During the production of cylindrical battery cells, the tabs and current collectors of the electrode assembly need to be welded, so a clamp device is required to press and fix the current collector and the electrode assembly, and then a welding device is used for welding.

[0051] The general clamp device includes a driving member, which drives the pressure plate to press the current collecting plate onto the pole ear of the electrode assembly. In this scheme, after the driving member drives the pressure plate to press the current collecting plate, it is impossible to know whether the current collecting plate is pressed into place. If it is not pressed into place, it will cause a problem of poor welding between the current collecting plate and the pole ear. In addition, during use, the pressure plate will tilt due to the long-term stress surface, resulting in uneven stress at various parts of the current collecting plate, which will also cause a problem of poor welding between the current collecting plate and the pole ear, reducing the welding quality.

[0052] In view of this, the present application provides a clamp device, which sets a pressing mechanism and uses the distance measuring structure in the pressing mechanism to measure the distance information between the current collecting plate and the distance measuring structure. The pressing structure presses multiple areas of the current collecting plate corresponding to the pressing units on the pole ear according to the distance information. In this way, different parts of the current collecting plate can be effectively pressed, thereby improving the uniformity of pressure on different parts of the current collecting plate, reducing the problem of cold welding between the current collecting plate and the pole ear of the electrode assembly, and improving the welding quality.

[0053] Figure 1 A schematic diagram of the structure of welding equipment provided in some embodiments of the present application.

[0054] like Figure 1As shown, the embodiment of the present application provides a welding device 100, which includes a clamp device 200 and a welding device 300. The clamp device 200 is used to press the current collecting plate 6 and the electrode assembly 5 together. The welding device 300 is used to weld the current collecting plate 6 to the electrode lug of the electrode assembly 5.

[0055] Exemplarily, the welding device 300 welds the current collecting plate 6 to the pole lug by laser welding.

[0056] Figure 2 A schematic diagram of a structure of a clamp device provided in some embodiments of the present application; Figure 3 Another structural schematic diagram of a clamp device provided in some embodiments of the present application; Figure 4 A schematic diagram of the structure of a pressing mechanism in a clamp device provided in some embodiments of the present application; Figure 5 for Figure 4 The pressing mechanism is shown in a cross-sectional view at AA.

[0057] like Figure 2-Figure 5 As shown, the present application also provides a clamp device 200 for use in the welding process of a cylindrical battery cell, wherein the cylindrical battery cell includes an electrode assembly 5 and a current collecting plate 6, and the electrode assembly 5 has a pole ear. The clamp device 200 includes a positioning mechanism 1 and a pressing mechanism 2. The positioning mechanism 1 is used to position the electrode assembly 5 from a first position to a second position. The pressing mechanism 2 includes a seat body 21 and a plurality of pressing units 22 arranged on the seat body 21, and the pressing unit 22 includes an electrically connected distance measuring structure 221 and a pressing structure 222. Among them, the distance measuring structure 221 is used to measure the distance information between itself and the current collecting plate 6 when the current collecting plate 6 is located on the pole ear in the second position, and the pressing structure 222 is configured to press the areas of the current collecting plate 6 corresponding to the plurality of pressing units 22 on the pole ear according to the distance information.

[0058] It should be noted that the pressing structure 222 applies pressure to the current collecting plate 6 so that the current collecting plate 6 applies pressure to the tab.

[0059] The positioning mechanism 1 of the embodiment of the present application positions the electrode assembly 5 from the first position to the second position. For example, the positioning mechanism 1 can raise the electrode assembly 5 from the first position to the second position, or can translate the electrode assembly 5 from the first position to the second position. When in use, after the electrode assembly 5 is moved to the second position, the current collecting plate 6 is located on the pole ear at the second position, and then the distance measuring structure 221 starts to measure the distance information again.

[0060] The plurality of pressing units 22 in the embodiment of the present application may be embedded in the base body 21 , or may be fixed to the lower surface of the base body 21 .

[0061] The plurality of pressing units 22 in the embodiment of the present application may be arranged at intervals from each other, and two adjacent pressing units 22 may also abut against each other.

[0062] The electrical connection between the distance measuring structure 221 and the pressing structure 222 in the embodiment of the present application means that the two can perform signal transmission. The distance measuring structure 221 and the pressing structure 222 in the embodiment of the present application can have a gap, or can be abutted and connected.

[0063] The distance measuring structure 221 in the embodiment of the present application may be an infrared distance measuring sensor or a laser distance measuring sensor.

[0064] The pressing structure 222 of the embodiment of the present application may include a motor or a cylinder.

[0065] The pressing structure 222 of the embodiment of the present application is configured to press the areas of the current collecting disk 6 corresponding to the multiple pressing units 22 respectively onto the pole lug according to the distance information. Exemplarily, first, the multiple pressing structures 222 press the current collecting disk 6 onto the pole lug, and then the multiple distance measuring structures 221 measure the distance between different parts of the current collecting disk 6 and the corresponding distance measuring structures 221. If the distance is greater than the preset distance, the pressing structure 222 continues to press down; if the distance is equal to or less than the preset distance, the pressing structure 222 remains stationary. Among them, if the distance is greater than the preset distance, the pressing structure 222 continues to press down, which may be that multiple distance measuring structures 221 are controlled to press down together, or that the pressing structure 222 in the same pressing unit 22 as the distance measuring structure 221 performs a pressing action, and the rest remain stationary.

[0066] Optionally, the clamp device 200 also includes a PLC system, and the distance information between the multiple distance measuring structures 221 and the collecting plate 6 is fed back to the PLC system through a signal line. After calculation, the PLC system determines that if the distance information of each distance measuring structure 221 meets the specification, subsequent welding will be carried out normally. If the distance information of some distance measuring structures 221 does not meet the specification, the pressing structure 222 of the abnormal point will be triggered, and the pressing structure 222 will be adjusted downward until all distance information is within the range, and the welding equipment can then weld.

[0067] As another example, the multiple distance measuring structures 221 first measure the distance between different parts of the collecting plate 6 and the corresponding distance measuring structures 221, and the pressing structure 222 performs a corresponding downward pressing stroke according to the distance. Of course, other methods can also be used between the distance measuring structure 221 and the pressing structure 222 to adjust or determine the pressing stroke of the pressing structure 222.

[0068] The distance measuring structure 221 of the embodiment of the present application can be disposed on the output shaft 223 of the pressing structure 222, or on the base 21. When the distance measuring structure 221 is disposed at different positions, the corresponding preset distances are different.

[0069] The clamp device 200 of the embodiment of the present application is provided with a distance measuring structure 221, and uses the distance measuring structure 221 to measure the distance information between the current collecting plate 6 and itself. The pressing structure 222 presses different areas of the current collecting plate 6 corresponding to multiple pressing units 22 on the pole ear according to the distance information. In this way, different parts of the current collecting plate 6 can be pressed, thereby improving the uniformity of pressure on different parts of the current collecting plate 6, reducing the problem of cold welding between the current collecting plate 6 and the pole ear, and improving the welding quality.

[0070] In some embodiments, a plurality of pressing units 22 are arranged at intervals, the distance between the distance measuring structure 221 and the pressing structure 222 in the pressing unit 22 is h1, the distance between any two adjacent pressing units 22 is h2, and h1 and h2 satisfy: h1<h2.

[0071] Optionally, the distance between the distance measuring structure 221 and the pressing structure 222 is 0, that is, the two offset each other. Exemplarily, the pressing structure 222 includes a main body and an output shaft 223, the main body is fixed to the seat 21, the output shaft 223 is used to press the collecting plate 6, and the distance measuring structure 221 is connected to the main body of the pressing structure 222.

[0072] There may also be a gap between the distance measuring structure 221 and the pressing structure 222 in the embodiment of the present application.

[0073] With such a configuration, the distance between the distance measuring structure 221 and the pressing structure 222 in the pressing unit 22 can be made smaller, so that the data measured by the distance measuring structure 221 is more accurate and can basically represent the distance between the pressing structure 222 and the collecting plate 6, thereby making the pressing stroke of the pressing structure 222 more accurate and improving the pressing effect.

[0074] In some embodiments, the pressing structure 222 includes an output shaft 223 for abutting against the collecting plate 6 , and the entire distance measuring structure 221 is embedded in the output shaft 223 .

[0075] The output shaft 223 of the embodiment of the present application is provided with a receiving groove or a notch, and the distance measuring structure 221 is embedded in the receiving groove or the notch. The output shaft 223 has a first surface 224 for abutting against the collecting plate 6, and the distance measuring structure 221 has a spacing or no spacing with the plane where the first surface 224 is located, but cannot protrude from the first surface 224.

[0076] Integrating the distance measuring structure 221 into the output shaft 223 can save space and improve space utilization. In addition, the distance information measured by the distance measuring structure 221 is the distance between the output shaft 223 and the collecting plate 6, so that according to the distance information, the entire downward pressing stroke of the output shaft 223 is more accurate and the pressing effect is better.

[0077] In some embodiments, the output shaft 223 has a first surface 224 for pressing the collecting plate 6 , and a distance is provided between the distance measuring structure 221 and the plane where the first surface 224 is located.

[0078] Such a configuration can reduce the protrusion of the distance measuring structure 221 during use, thereby protecting the distance measuring structure 221.

[0079] In some embodiments, a plurality of pressing units 22 are arranged at intervals along the circumference of the seat body 21 .

[0080] Exemplarily, the number of the pressing units 22 is five, six, seven or eight.

[0081] Since the current collecting plate 6 is substantially circular, the pressing units 22 are arranged in an annular pattern at intervals, which can better match the shape of the current collecting plate 6 and improve the pressing effect. In addition, more pressing units 22 can be arranged.

[0082] Optionally, a plurality of pressing units 22 are arranged in a ring shape and are equidistantly spaced apart.

[0083] In some embodiments, the plurality of pressing units 22 apply pressing force independently of each other.

[0084] The multiple pressing units 22 in the embodiment of the present application independently apply pressing force to each other, which means that the pressing units 22 each apply pressing force to the collecting plate 6 according to the distance information measured by the distance measuring structure 221, and are not controlled to press down synchronously and do not affect each other.

[0085] With such arrangement, the pressing can be carried out specifically according to the conditions of different parts of the collecting plate 6, so that the object pressed is more accurate and the pressing effect is better.

[0086] In some embodiments, the distance measuring structure 221 includes a laser sensor or an ultrasonic sensor, and / or the pressing structure 222 includes a motor.

[0087] The distance measuring structure 221 is configured to include a laser sensor or an ultrasonic sensor. The laser sensor or the ultrasonic sensor is more reliable to use and is more suitable for a shorter pressing stroke.

[0088] The pressing structure 222 is configured to include a motor, which has higher precision and can meet the pressing precision required by the pressing structure 222. Specifically, the positioning mechanism 1 positions the electrode assembly 5 from the first position to the second position, which is a rough adjustment, while the pressing of the pressing structure 222 is a fine adjustment, so a motor is more suitable.

[0089] In some embodiments, the positioning mechanism 1 includes a driving member 11 and a supporting member 12 , the supporting member 12 is used to support the electrode assembly 5 , and the driving member 11 is used to drive the supporting member 12 to rise so as to position the electrode assembly 5 from the first position to the second position.

[0090] The driving member 11 of the embodiment of the present application may be a cylinder or a hydraulic cylinder. The bearing member 12 of the embodiment of the present application may be a plate-shaped member or other shapes.

[0091] The driving member 11 is configured to drive the supporting member 12 to rise, so that the downward pressing stroke of the pressing mechanism 2 can be reduced, thereby improving the pressing efficiency.

[0092] In some embodiments, the carrier 12 has a carrying surface 121 for carrying the electrode assembly 5, and the carrier 12 also includes a limiting portion 122, which is connected to the carrying surface 121 and is configured to be arranged on at least a portion of the outer peripheral side of the electrode assembly 5 and to limit the electrode assembly 5.

[0093] The limiting portion 122 of the embodiment of the present application may be arranged in a circle around the electrode assembly 5 , or may have a gap, that is, be arranged around most of the circle of the electrode assembly 5 .

[0094] The limiting portion 122 is used to limit the electrode assembly 5 to reduce displacement of the electrode assembly 5 during the ascending process, the pressing process of the pressing structure 222 and the subsequent welding process, thereby improving the welding quality.

[0095] In some embodiments, the clamping device 200 also includes a limit member 3, which is disposed above the supporting member 12 and is configured to surround a portion of the outer circumference of the electrode assembly 5 and limit the electrode assembly 5. The limit member 3 has an opening in the surrounding direction, and the opening allows the electrode assembly 5 to enter the limit member 3.

[0096] In the embodiment of the present application, the entire surface of the limiting member 3 facing the electrode assembly 5 can be used to limit the electrode assembly 5, or a portion of the surface facing the electrode assembly 5 can be used to limit the electrode assembly 5.

[0097] Exemplarily, when the electrode assembly 5 is placed, the bottom of the electrode assembly 5 enters the limiting portion 122 of the carrier 12, and the top and / or side of the electrode assembly 5 enters from the opening and fits with the limiting member 3. Then, after the driving member 11 drives the electrode assembly 5 to rise to the second position, the plurality of pressing structures 222 press the current collecting plate 6 onto the electrode assembly 5 according to the distance information.

[0098] The limiting member 3 is provided to reduce the displacement of the electrode assembly 5 during the ascending process and the subsequent welding process, thereby improving the welding quality.

[0099] In some embodiments, the clamp device 200 further includes a frame, and the positioning mechanism 1 and the pressing mechanism 2 are both connected to the frame.

[0100] Exemplarily, the limiting member 3 is also connected to the frame.

[0101] A frame is provided to connect the pressing mechanism 2 and the positioning mechanism 1 together, thereby eliminating the need for additional installation of the pressing mechanism 2 and enabling the positioning mechanism 1 and the pressing mechanism 2 to be aligned in position.

[0102] In a second aspect, an embodiment of the present application further provides a welding device 100, comprising the above-mentioned clamp device 200 and a welding device 300, wherein the welding device 300 is used to weld the current collecting plate 6 to the pole ear.

[0103] See also Figure 2-Figure 5 , the embodiment of the present application provides a clamp device 200, which is used in the welding process of a cylindrical battery cell, wherein the cylindrical battery cell includes an electrode assembly 5 and a current collecting plate 6, and the electrode assembly 5 has a pole ear. The clamp device 200 includes a positioning mechanism 1 and a pressing mechanism 2. The positioning mechanism 1 is used to position the electrode assembly 5 from a first position to a second position. The pressing mechanism 2 includes a seat 21 and a plurality of pressing units 22 arranged on the seat 21, and the pressing unit 22 includes an electrically connected distance measuring structure 221 and a pressing structure 222. Among them, the distance measuring structure 221 is used to measure the distance information between itself and the current collecting plate 6 when the current collecting plate 6 is located on the pole ear in the second position, and the pressing structure 222 is configured to press the areas of the current collecting plate 6 corresponding to the plurality of pressing units 22 on the pole ear according to the distance information. The plurality of pressing units 22 apply pressing force independently of each other. The pressing structure 222 includes an output shaft 223 for abutting against the current collecting plate 6, and the entire distance measuring structure 221 is embedded in the output shaft 223. The output shaft 223 has a first surface 224 for pressing the current collecting plate 6, and the distance measuring structure 221 is spaced apart from the plane where the first surface 224 is located. The positioning mechanism 1 includes a driving member 11 and a bearing member 12, the bearing member 12 is used to bear the electrode assembly 5, and the driving member 11 is used to drive the bearing member 12 to rise so that the electrode assembly 5 is positioned from the first position to the second position. The clamp device 200 also includes a limiting member 3, which is disposed above the bearing member 12 and is configured to surround a portion of the outer circumference of the electrode assembly 5 and limit the electrode assembly 5, and the limiting member 3 has an opening in the surrounding direction, and the opening is for the electrode assembly 5 to enter the limiting member 3.

[0104] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0105] 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 it. 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 make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A clamp device used in a welding process of a cylindrical battery cell, wherein the cylindrical battery cell comprises an electrode assembly and a current collecting plate, wherein the electrode assembly has a tab, wherein: The clamp device comprises: A positioning mechanism, used to position the electrode assembly from a first position to a second position; A pressing mechanism, the pressing mechanism comprising a base and a plurality of pressing units disposed on the base, the pressing units comprising a distance measuring structure and a pressing structure that are electrically connected; Wherein, the distance measuring structure is used to measure the distance information between itself and the current collecting plate when the current collecting plate is located on the pole ear in the second position, and the pressing structure is configured to press the areas of the current collecting plate corresponding to the multiple pressing units respectively onto the pole ear according to the distance information.

2. The clamp device according to claim 1, characterized in that: The plurality of pressing units are arranged at intervals, the distance between the distance measuring structure and the pressing structure in the pressing unit is h1, the distance between any two adjacent pressing units is h2, and h1 and h2 satisfy: h1<h2.

3. The clamping device according to claim 1, characterized in that: The pressing structure comprises an output shaft for abutting against the collecting plate, and the entire distance measuring structure is embedded in the output shaft.

4. The clamp device according to claim 3, characterized in that: The output shaft has a first surface for pressing the collecting plate, and a distance is formed between the distance measuring structure and the plane where the first surface is located.

5. The clamp device according to claim 1, characterized in that: The plurality of pressing units are arranged at intervals along the circumferential direction of the seat body.

6. The clamp device according to claim 1, characterized in that: The plurality of pressing units apply pressing forces independently of each other.

7. The clamp device according to claim 1, characterized in that: The distance measuring structure includes a laser sensor or an ultrasonic sensor, and / or the pressing structure includes a motor.

8. The clamp device according to claim 1, characterized in that: The positioning mechanism includes a driving member and a supporting member, wherein the supporting member is used to support the electrode assembly, and the driving member is used to drive the supporting member to rise so as to position the electrode assembly from the first position to the second position.

9. The clamp device according to claim 8, characterized in that: The carrier has a carrying surface for carrying the electrode assembly, and the carrier also includes a limiting portion, which is connected to the carrying surface and is configured to be arranged on at least a portion of the outer circumference of the electrode assembly to limit the electrode assembly.

10. The clamp device according to claim 8, characterized in that The clamp device also includes a limiting member, which is arranged above the supporting member and is configured to surround a portion of the outer circumference of the electrode assembly and limit the electrode assembly. The limiting member has an opening in the surrounding direction, and the opening allows the electrode assembly to enter the limiting member.

11. The clamp device according to claim 1, characterized in that: The clamp device also includes a frame, and the positioning mechanism and the pressing mechanism are both connected to the frame.

12. A welding device, characterized in that: include: The clamp device according to any one of claims 1 to 11; A welding device is used for welding the current collecting plate to the pole ear.

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