Laser welding tool and laser welding equipment

Abstract

The utility model relates to the technical field of battery production, in particular to a laser welding tool and laser welding equipment. The laser welding tool comprises an upper pressing piece and a lower pressing piece, wherein a through hole allowing laser to pass through is formed in the upper pressing piece; at least part of the light-transmitting part is arranged corresponding to the through hole, when the laser welding tool works, the light-transmitting part is located between the upper pressing part and the to-be-welded part and is pressed on at least part of the surface, facing the upper pressing part, of the to-be-welded part, the upper pressing part comprises a flat plate part and a protruding part which are connected, an opening structure is arranged on the flat plate part, and the protruding part is arranged corresponding to the opening structure. The base extends along a first direction; the protruding part is of a hollow structure and forms a channel, and the opening structure is matched with the channel to form a through hole. By means of the mode, the light-transmitting plate is used for pressing the to-be-welded part, laser welding can be achieved at the positions of ultrasonic welding parts such as an integrated busbar, the bad effect on welding caused by welding pad oxidation can be prevented, and the phenomena of insufficient welding and welding refusal are not prone to occurring.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery production, in particular to a laser welding tool and a laser welding device. BACKGROUND

[0002] Electric energy is a very environmentally friendly energy, which is applied in various fields such as energy storage, transportation, daily necessities, scientific research and the like. Especially in the automobile industry, with the rise of new energy vehicles, batteries are widely used in the automobile industry. Therefore, battery technology is an important factor related to social development.

[0003] In the development of battery technology, the production process of the battery is an important factor determining the quality of the battery. In the existing battery production, the welding of some processes is ultrasonic welding, such as the welding of integrated busbars or sampling wire harnesses. However, ultrasonic welding has limitations, and the welding effect is poor. CONTENT OF THE INVENTION

[0004] In view of the above problems, the application provides a laser welding tool and a laser welding device. The laser welding tool is provided with a light-transmitting piece for pressing the to-be-welded piece, which can solve the technical problem that ultrasonic welding has limitations and the welding effect is poor.

[0005] To solve the above technical problems, one technical solution adopted by the application is to provide a laser welding tool, which comprises: an upper pressing piece, the upper pressing piece is formed with a through hole allowing laser to pass through; a light-transmitting piece, at least part of the light-transmitting piece is arranged corresponding to the through hole, and when the laser welding tool is working, the light-transmitting piece is located between the upper pressing piece and the to-be-welded piece and is pressed on at least part of the surface of the to-be-welded piece facing the upper pressing piece. The upper pressing piece comprises a flat plate part and a protruding part connected to each other, the flat plate part is provided with an opening structure, the protruding part is arranged corresponding to the opening structure and extends in a first direction; the protruding part is a hollow structure, forming a channel, the opening structure and the channel cooperate to form the through hole, and when the laser welding tool is working, the flat plate part, the protruding part, the light-transmitting piece and the to-be-welded piece are arranged in the first direction in sequence.

[0006] In the above manner, the to-be-welded piece is pressed by the light-transmitting plate, which can ensure the position of the to-be-welded piece fixed during welding, so that laser welding can be realized on components such as integrated busbars which use ultrasonic welding, and the adverse effects of pad oxidation on welding can be prevented, and the phenomenon of false welding and refusal to weld is not easy to occur. Such protruding structure can prevent residues from splashing during welding.

[0007] In some embodiments, the light-transmitting piece is connected to the side of the protruding part away from the flat plate part, and covers the end of the protruding part away from the flat plate part, so as to close the opening of the channel away from the flat plate part.

[0008] The light-transmitting piece is connected with the convex part and can move together with the convex part, and the convex part and the light-transmitting piece do not need to be aligned.

[0009] In some embodiments, the shapes of the opening structure, the convex part and the light-transmitting piece correspond to each other.

[0010] Such a structure can ensure the consistency of the opening structure, the convex part and the light-transmitting piece, so that the light-transmitting piece can fully correspond to the opening structure and the convex part.

[0011] In some embodiments, the number of the opening structure, the convex part and the light-transmitting piece is multiple, and the opening structure, the convex part and the light-transmitting piece are arranged one by one.

[0012] Such a structure can reduce the amount of the light-transmitting piece, thereby saving costs.

[0013] In some embodiments, the number of the opening structure and the convex part is multiple, the opening structure and the convex part are arranged one by one, the number of the light-transmitting piece is at least one, and the number of the light-transmitting piece is less than the number of the convex part, and at least one light-transmitting piece corresponds to at least two convex parts.

[0014] Such a structure can reduce the number of the light-transmitting piece and increase the coverage area of the light-transmitting piece, so that the light-transmitting piece can press a larger area of the workpiece to be welded.

[0015] In some embodiments, the number of the light-transmitting piece corresponds to the number of the upper pressing piece, and when the laser welding tool works, the light-transmitting piece is located between all the convex parts of the upper pressing piece and the workpiece to be welded.

[0016] In this way, one upper pressing piece corresponds to one light-transmitting piece, so that the light-transmitting piece can press the entire workpiece to be welded, thereby preventing the workpiece to be welded from being displaced and causing inaccurate welding alignment.

[0017] In some embodiments, the laser welding tool further comprises a power device, the power device is connected with the light-transmitting piece, and the power device drives the light-transmitting piece to move.

[0018] The power device drives the light-transmitting piece to move, so that the light-transmitting piece can work independently of the upper pressing piece and can work before the upper pressing piece, thereby facilitating the calibration and adjustment of the workpiece to be welded.

[0019] In some embodiments, the light transmittance of the light-transmitting piece is not less than 50%.

[0020] In this way, the laser can pass through the light-transmitting piece to realize laser welding.

[0021] In some embodiments, the light transmittance of the light-transmitting piece is not less than 80%.

[0022] Such a light transmittance can reduce the attenuation of the laser and reduce the loss of the laser, thereby improving the welding effect.

[0023] In some embodiments, the surface of the light-transmitting piece away from the side of the upper pressing piece is a plane.

[0024] Such a structure can make the to-be-welded piece achieve better pressing effect.

[0025] In some embodiments, the laser welding tool further comprises a lower pressing piece, and the lower pressing piece clamps the to-be-welded piece in cooperation with the light-transmitting piece when the laser welding tool works.

[0026] The arrangement of the lower pressing piece makes the to-be-welded piece more flat, which is beneficial to the pressing of the light-transmitting piece.

[0027] To solve the above technical problems, another technical solution adopted by the present application is to provide a laser welding device for welding internal components of a battery device, which comprises the laser welding tool according to any one of the above.

[0028] In the above manner, the laser welding device can press the to-be-welded piece by using the light-transmitting plate, can ensure the position of the to-be-welded piece fixed during welding, and thus can realize laser welding at the part using ultrasonic welding such as the integrated busbar, can prevent the adverse effects of pad oxidation on welding, and is not prone to the phenomenon of false welding and welding rejection.

[0029] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above content and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating laborious work.

[0031] Figure 1 It is a side view perspective structure schematic diagram of the laser welding tool according to one or more embodiments of the present application;

[0032] Figure 2 It is a side view perspective structure schematic diagram of the laser welding tool according to one or more embodiments of the present application; Figure 1

[0033] Figure 3 It is a side view perspective structure schematic diagram of the laser welding tool according to one or more embodiments of the present application;

[0034] Figure 4 It is a side view perspective structure schematic diagram of the laser welding tool according to one or more embodiments of the present application;​Figure 3 A perspective view of a laser welding tooling in the laser welding tooling.

[0035] In the drawings: 10 - laser welding tooling; 11 - upper pressing piece; 111 - flat plate part; 112 - protruding part; 15 - through hole; 151 - opening structure; 152 - channel; 12 - light-transmitting piece; 13 - lower pressing piece; 20 - piece to be welded. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and claims of the present application and the above description of the drawings are intended to cover the non-exclusive inclusion.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, unless otherwise explicitly and specifically limited, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0039] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0041] In the description of the embodiments of the present application, the directions or positional relationships indicated by the technical terms "length", "upper", "lower", "bottom", "inner", "outer" and the like are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] The battery device can supply power as a power supply for the electric equipment, which can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0044] During the production process of the battery device, welding operations are required, such as welding of the pole piece, welding of the integrated busbar, and welding of the sampling wire harness. Taking the welding of the integrated busbar as an example, the tab and the branch of the flexible circuit board need to be welded during welding. However, since the branch of the flexible circuit board is relatively soft, it cannot be well fixed on the tab and is prone to warping, and laser welding may not be successful due to misalignment, so ultrasonic welding is required to perform welding. However, ultrasonic welding has high requirements for the pads on the tab and / or the branch of the flexible circuit board, and has limitations. If the pads are oxidized, ultrasonic welding may have the phenomena of virtual welding and refusal to weld. In addition, compared with laser welding, ultrasonic welding also has the problems of high cost, easy damage to the branch of the flexible circuit board, difficulty in welding point detection, and poor welding stability. When welding the sampling wire harness, since the sampling wire harness is also prone to warping, this problem may also exist.

[0045] Based on the above considerations, in order to solve the technical problem that the use of ultrasonic welding has limitations when welding the internal components of the battery device in the prior art, and the phenomenon of false welding and refusal to weld may occur, the application provides a laser welding tool and a laser welding device. The reason why the integrated busbar or the sampling wire harness cannot use laser welding is that it is prone to warping. To solve the warping problem, it needs to be positioned to prevent warping. Therefore, the laser welding tool of the application includes an upper pressing piece and a light-transmitting piece. The upper pressing piece has a through hole allowing laser to pass through, and at least part of the light-transmitting piece is arranged corresponding to the through hole. When the laser welding tool works, the light-transmitting piece is located between the upper pressing piece and the to-be-welded piece, and is pressed against at least part of the surface of the to-be-welded piece facing the upper pressing piece. By pressing the to-be-welded piece with the light-transmitting piece, the flexible circuit board branch or the sampling wire harness can be positioned and pressed, and warping does not occur, so that laser welding can be used for welding. Since the light-transmitting piece can transmit light, the laser can pass through to achieve the purpose of welding. The oxidation of the welding pad does not affect laser welding, or the effect of the oxidation of the welding pad on laser welding is smaller than that on ultrasonic welding. Therefore, by arranging the light-transmitting piece, some components that can only be welded by ultrasonic welding can be welded by laser welding, so that the limitations of ultrasonic welding do not exist, and the phenomenon of false welding and refusal to weld does not easily occur. Moreover, the cost of laser welding is lower than that of ultrasonic welding, the flexible circuit board branch is not easily damaged, the welding point is easy to detect, and the welding stability is strong.

[0046] In order to solve the problem that ultrasonic welding has limitations and the welding effect is poor, so that the internal components of the battery device can be welded by laser welding, the application provides a laser welding tool and a laser welding device. Please refer to Figure 1 With Figure 2 , Figure 1 is a side perspective structure schematic diagram of the laser welding tool according to one or more embodiments of the application; Figure 2 is Figure 1 a perspective structure schematic diagram of the laser welding tool in the application. The laser welding tool 10 includes an upper pressing piece 11 and a light-transmitting piece 12. The upper pressing piece 11 has a through hole 15 allowing laser to pass through, and at least part of the light-transmitting piece 12 is arranged corresponding to the through hole 15. When the laser welding tool 10 works, the light-transmitting piece 12 is located between the upper pressing piece 11 and the to-be-welded piece 20, and is pressed against at least part of the surface of the to-be-welded piece 20 facing the upper pressing piece 11.

[0047] The laser welding tool 10 is a tool used to assist laser welding. Laser welding needs to ensure that the pieces to be welded 20 are in close contact, so the laser welding tool 10 is needed to complete this task. Some laser welding tools 10 also need to have the functions of assisting laser positioning, preventing laser leakage or solder splashing, etc. The upper pressing piece 11 is a component that performs pressing in the laser welding tool 10. The upper pressing piece 11 is generally made of metal and can withstand laser irradiation without being damaged. The through hole 15 in the upper pressing piece 11 is a position that allows laser to pass through, and the laser irradiates the pieces to be welded 20 through the through hole 15, and welding is achieved through the energy of the laser. The light-transmitting piece 12 can transmit light and allow laser to pass through. When the laser welding tool 10 is working, for example, when welding an integrated busbar, in order to prevent the branches of the flexible circuit board in the integrated busbar from being raised relative to the bar piece, the light-transmitting piece 12 is used to press the branches of the flexible circuit board on the bar piece. Since part or all of the light-transmitting piece 12 is provided corresponding to the through hole 15, the light-transmitting piece 12 will correspond to the position of the pieces to be welded 20 that need to be welded. After the laser passes through the through hole 15, it passes through the light-transmitting piece 12 and irradiates the position of the pieces to be welded 20 that need to be welded, thereby achieving laser welding.

[0048] In the above manner, the light-transmitting plate is used to press the pieces to be welded 20, which can ensure the position of the pieces to be welded 20 fixed during welding, thereby realizing laser welding at the components using ultrasonic welding such as integrated busbars, preventing the adverse effects of pad oxidation on welding, and reducing the phenomenon of false welding and welding rejection.

[0049] In some embodiments, the upper pressing piece 11 includes a flat plate part 111 and a protruding part 112 connected together. The flat plate part 111 is provided with an opening structure 151, and the protruding part 112 is provided corresponding to the opening structure 151 and extends in the first direction. The protruding part 112 is a hollow structure forming a channel 152, and the opening structure 151 and the channel 152 cooperate to form the through hole 15. When the laser welding tool 10 is working, the flat plate part 111, the protruding part 112, the light-transmitting piece 12, and the pieces to be welded 20 are arranged in the first direction in sequence.

[0050] The flat plate part 111 is a main part of the upper pressing part 11, and is generally in a plate shape. The protruding part 112 is a structure protruding from the flat plate part 111. The protruding part 112 can be connected with the flat plate part 111 by screwing, welding, riveting, bonding, or the like, or the protruding part 112 can be in an integral structure with the flat plate part 111. The opening structure 151 on the flat plate part 111 is for allowing laser to pass through. The hollow structure of the protruding part 112 is also for allowing laser to pass through. The shapes of the opening structure 151 and the hollow structure can be the same or different, as long as they can allow laser to pass through. The protruding part 112 needs to cover the opening of the opening structure 151 towards the side of the protruding part 112, so as to achieve sealing and prevent leakage of laser. When laser welding is performed, the protruding part 112 is closer to the part to be welded 20, and can prevent residues generated during welding from flying out. The protruding part 112 can be in a tapered structure away from the flat plate part 111, so as to enhance this effect.

[0051] Therefore, the protruding structure can prevent residues from flying during welding.

[0052] In some embodiments, the light-transmitting part 12 is connected to the side of the protruding part 112 away from the flat plate part 111, and covers the end of the protruding part 112 away from the flat plate part 111, so as to seal the opening of the channel 152 away from the flat plate part 111.

[0053] The light-transmitting part 12 can be connected to the protruding part 112 by bonding or the like. Since the side of the protruding part 112 away from the flat plate part 111 is the side facing the part to be welded 20, the light-transmitting part 12 needs to be arranged at this position, so as to press the part to be welded 20. In order to ensure the pressing effect, the light-transmitting part 12 needs to seal the opening of the channel 152 away from the flat plate part 111.

[0054] The light-transmitting part 12 is connected with the protruding part 112, and can move together with the protruding part 112, and there is no need to align the protruding part 112 with the light-transmitting part 12.

[0055] In some embodiments, the shapes of the opening structure 151, the protruding part 112, and the light-transmitting part 12 correspond to each other.

[0056] According to needs, the opening structure 151 can be a rectangular opening, a triangular opening, a circular opening, an elliptical opening, or an opening of other shapes. Similarly, the shapes of the protruding part 112 and the light-transmitting part 12 can be the same as the shape of the opening structure 151. The shape of the protruding part 112 is the external shape of the protruding part 112. The shape of the channel 152 in the protruding part 112 can be the same as or different from the shape of the opening structure 151, and can be adjusted according to the needs of laser welding.

[0057] The structure can ensure the consistency of the opening structure 151, the convex portion 112 and the light-transmitting piece 12, and enable the light-transmitting piece 12 to fully correspond to the opening structure 151 and the convex portion 112.

[0058] In some embodiments, the opening structure 151, the convex portion 112 and the light-transmitting piece 12 are multiple in number, and are arranged one by one.

[0059] One flat plate portion 111 can be provided with multiple opening structures 151, so that multiple positions can be welded through one flat plate portion 111, especially for components such as integrated busbars and sampling harnesses that need to be welded at multiple positions. The multiple opening structures 151 can enable multiple welding to be performed once the laser welding tool 10 is laid out, so that multiple positions can be welded, and welding is more convenient and fast. The convex portion 112 and the light-transmitting piece 12 need to correspond to the opening structure 151 one by one, so that the light-transmitting piece 12 can be pressed and combined at the welding position of the to-be-welded component 20. For multiple welding positions, using one opening structure 151 will result in a larger opening structure 151, and the corresponding light-transmitting piece 12 will also be larger. Using multiple opening structures 151 will result in a smaller total area of the opening structure 151, and a smaller area of the light-transmitting piece 12.

[0060] The structure can reduce the amount of the light-transmitting piece 12, thereby saving costs.

[0061] Please further refer to Figure 3 and Figure 4 , Figure 3 is a side perspective structure schematic diagram of a laser welding tool according to another embodiment of the present application; Figure 4 is Figure 3 is a perspective structure schematic diagram of the laser welding tool in some embodiments. In some embodiments, the opening structure 151 and the convex portion 112 are multiple in number, and are arranged one by one. The light-transmitting piece 12 is at least one in number, and the number of the light-transmitting piece 12 is less than the number of the convex portion 112. At least one light-transmitting piece 12 corresponds to at least two convex portions 112.

[0062] One light-transmitting piece 12 can correspond to at least two convex portions 112, that is, multiple welding points can exist on the to-be-welded component 20 pressed and combined by one light-transmitting piece 12. The larger the coverage area of the light-transmitting piece 12 is, the more stable the pressing and combination of the to-be-welded component 20 is.

[0063] The structure can reduce the number of the light-transmitting piece 12 and increase the coverage area of the light-transmitting piece 12, so that the light-transmitting piece 12 can press and combine a larger area of the to-be-welded component 20.

[0064] In some embodiments, the number of light-transmitting pieces 12 corresponds to the number of upper pressing pieces 11, and the light-transmitting pieces 12 are located between the protruding portions 112 of the upper pressing pieces 11 and the pieces to be welded 20 when the laser welding tool 10 is in operation.

[0065] The light-transmitting pieces 12 can be one whole body corresponding to the upper pressing pieces 11, and the surface area of the light-transmitting pieces 12 can be the same as that of the upper pressing pieces 11, so as to cover the pieces to be welded 20 with a large area.

[0066] In this way, one upper pressing piece 11 corresponds to one light-transmitting piece 12, so as to press the whole piece to be welded 20 through the light-transmitting piece 12. After pressing, the light-transmitting piece 12 is one whole body, so as to press all the welding points of the piece to be welded 20, and also press the parts between the welding points, further preventing the movement of the piece to be welded 20, so as to prevent the misalignment of the welding caused by the displacement of the piece to be welded 20 as much as possible.

[0067] In some embodiments, the laser welding tool 10 further comprises a power device, and the power device is connected to the light-transmitting pieces 12, and drives the light-transmitting pieces 12 to move.

[0068] The power device is a device for driving the light-transmitting pieces 12 to move, which can be a cylinder, a motor assembly, a hydraulic assembly, a mechanical arm, etc. When laser welding is performed, the power device can be used to drive the light-transmitting pieces 12 to move first, so as to press the piece to be welded 20. Then, it can be checked whether the positions to be welded of the piece to be welded 20 are accurately aligned, and if not, the light-transmitting pieces 12 can be moved by the power device to expose the piece to be welded 20, so as to adjust the positions to be welded, and then repeat the above steps.

[0069] The power device drives the light-transmitting pieces 12 to move, so that the light-transmitting pieces 12 can work independently of the upper pressing pieces 11, and can work before the upper pressing pieces 11, which is convenient for calibrating and adjusting the piece to be welded 20.

[0070] In some embodiments, the light-transmitting rate of the light-transmitting pieces 12 is not less than 50%.

[0071] The light-transmitting piece 12 can be made of glass, resin, plastic, or the like. Taking the light-transmitting piece 12 as an example, the sum of the refractive index, the light-transmission rate, and the reflectivity of the glass is 1, i.e., 100%. The light-transmission rate is the ratio of the portion of light that transmits through the light-transmitting piece 12 to the whole. When the light-transmission rate is less than 50%, the energy of the laser light is greatly wasted, affecting the welding effect. Therefore, the light-transmission rate of the light-transmitting piece 12 needs to be not less than 50% to ensure that the energy of the laser light is not excessively wasted. The light-transmission rate of the light-transmitting piece 12 can be any one of 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, and 100%, or a range between any two of the above values, for example, the light-transmission rate of the light-transmitting piece 12 is between 55% and 95%.

[0072] Through such an arrangement, the laser light can pass through the light-transmitting piece 12, realizing laser welding.

[0073] In some embodiments, the light-transmission rate of the light-transmitting piece 12 is not less than 80%.

[0074] Taking the light-transmitting piece 12 as an example, the glass with a light-transmission rate of 80% has substantially no small bubbles inside, and can achieve good light-transmission effect. The higher the light-transmission rate of the light-transmitting piece 12, the smaller the loss of laser light during laser welding. The light-transmission rate of the light-transmitting piece 12 can be any one of 80%, 82%, 84%, 85%, 86%, 88%, 90%, 91%, 93%, 95%, 98%, and 100%, or a range between any two of the above values, for example, the light-transmission rate of the light-transmitting piece 12 is between 85% and 98%.

[0075] Such a light-transmission rate can reduce the attenuation of the laser light, reduce the loss of the laser light, and thus improve the welding effect.

[0076] In some embodiments, the surface of the light-transmitting piece 12 away from the upper pressing piece 11 is a plane.

[0077] Such a structure can enable the to-be-welded piece 20 to achieve a better pressing effect.

[0078] In some embodiments, the laser welding tool 10 further comprises a lower pressing piece 13. When the laser welding tool 10 is working, the lower pressing piece 13 clamps the to-be-welded piece 20 in cooperation with the light-transmitting piece 12.

[0079] The lower pressing piece 13 is a component that clamps the to-be-welded piece 20 in cooperation with the upper pressing piece 11 and the light-transmitting piece 12. The lower pressing piece 13 is generally located below the to-be-welded piece 20 and bears the to-be-welded piece 20. The light-transmitting piece 12 clamps the to-be-welded piece 20 in cooperation with the lower pressing piece 13, and is pressed against the surface of the to-be-welded piece 20 under the action of gravity or external force.

[0080] The arrangement of the lower pressing member 13 enables the to-be-welded member 20 to be more flat, and facilitates the light-transmitting member 12 to press the to-be-welded member 20.

[0081] To solve the above technical problems, the application provides another technical solution, which is to provide a laser welding device for welding internal components of a battery device, the laser welding device comprising the laser welding tool 10 according to any one of the above.

[0082] In the above manner, the laser welding device can press the to-be-welded member 20 by using the light-transmitting plate, can ensure the position of the to-be-welded member 20 during welding, and thus can realize laser welding at components using ultrasonic welding, such as integrated bus bars, can prevent adverse effects of pad oxidation on welding, and is not prone to virtual welding and welding rejection.

[0083] Finally, in a specific application scenario, in order to solve the problem that ultrasonic welding has limitations and poor welding effect, and enable internal components of a battery device to be welded by using laser welding, the application provides a laser welding tool and a laser welding device. The laser welding tool 10 comprises an upper pressing member 11 and a light-transmitting member 12. The upper pressing member 11 is formed with a through hole 15 allowing laser to pass through, and at least part of the light-transmitting member 12 is arranged corresponding to the through hole 15. During working of the laser welding tool 10, the light-transmitting member 12 is located between the upper pressing member 11 and the to-be-welded member 20, and is pressed against at least part of the surface of the to-be-welded member 20 facing the upper pressing member 11. The upper pressing member 11 comprises a flat plate portion 111 and a protruding portion 112 connected with each other. The flat plate portion 111 is provided with an opening structure 151, and the protruding portion 112 is arranged corresponding to the opening structure 151 and extends in a first direction. The protruding portion 112 is a hollow structure, and forms a channel 152, and the opening and the channel 152 cooperatively form the through hole 15. During working of the laser welding tool 10, the flat plate portion 111, the protruding portion 112, the light-transmitting member 12 and the to-be-welded member 20 are arranged in the first direction in sequence. The number of the opening structure 151 and the number of the protruding portion 112 are both plural, and the opening structure 151 and the protruding portion 112 are arranged one by one corresponding to each other. The number of the light-transmitting member 12 corresponds to the number of the upper pressing member 11, and during working of the laser welding tool 10, the light-transmitting member 12 is located between all the protruding portions 112 of the upper pressing member 11 and the to-be-welded member 20.

[0084] By the above-mentioned manner, the light-transmitting plate is used to press the to-be-welded piece 20, so that the position of the to-be-welded piece 20 can be fixed during welding, thereby the laser welding can be realized at the part using ultrasonic welding such as the integrated busbar, the adverse effect of the oxidation of the welding pad on the welding can be prevented, and the phenomenon of false welding and refused welding is not prone to occur. The convex structure can prevent residues from splashing during welding. The plurality of opening structures 151 are arranged, so that the laser welding tool 10 can be laid once to realize multiple welding, thereby multiple points are welded, and the welding is more convenient and fast. In this way, one upper pressing piece 11 corresponds to one light-transmitting piece 12, so that the to-be-welded piece 20 is pressed by the light-transmitting piece 12, and the displacement of the to-be-welded piece 20 caused by the inaccurate welding alignment can be prevented as much as possible.

[0085] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; 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 be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A laser welding tool, characterized by, The laser welding device comprises: an upper pressing member, wherein a through hole is formed on the upper pressing member to allow laser to pass through; a light-transmitting member, wherein at least part of the light-transmitting member is arranged corresponding to the through hole, and the light-transmitting member is located between the upper pressing member and a to-be-welded member and is pressed on at least part of the surface of the to-be-welded member facing the upper pressing member when the laser welding device is working; the upper pressing member comprises a flat plate part and a protruding part connected to each other, the flat plate part is provided with an opening structure, and the protruding part is arranged corresponding to the opening structure and extends in a first direction; the protruding part is a hollow structure to form a channel, and the opening structure and the channel cooperate to form the through hole; when the laser welding device is working, the flat plate part, the protruding part, the light-transmitting member and the to-be-welded member are arranged in the first direction in sequence.

2. The laser welding tooling of claim 1, wherein, The light-transmitting member is connected to the side of the protruding part away from the flat plate part, covers the end of the protruding part away from the flat plate part, and seals the opening of the channel away from the flat plate part.

3. The laser welding tooling of claim 2, wherein, The shapes of the opening structure, the protruding part and the light-transmitting member correspond to each other.

4. The laser welding tooling of claim 2, wherein, The number of the opening structure, the protruding part and the light-transmitting member is multiple, and the opening structure, the protruding part and the light-transmitting member are arranged one by one.

5. The laser welding tooling of claim 1, wherein, The number of the opening structure and the protruding part is multiple, the opening structure and the protruding part are arranged one by one, the number of the light-transmitting member is at least one, and the number of the light-transmitting member is less than the number of the protruding part, at least one light-transmitting member is arranged corresponding to at least two protruding parts.

6. The laser welding tooling of claim 5, wherein, The number of the light-transmitting member corresponds to the number of the upper pressing member, and when the laser welding device is working, the light-transmitting member is located between all the protruding parts of the upper pressing member and the to-be-welded member.

7. The laser welding tooling of claim 5, wherein, The laser welding device further comprises a power device, and the power device is connected to the light-transmitting member to drive the light-transmitting member to move.

8. The laser welding tooling of any of claims 1-7, wherein, The light-transmitting member has a light transmittance of not less than 50%.

9. The laser welding tooling of claim 8, wherein, The light-transmitting member has a light transmittance of not less than 80%.

10. The laser welding tooling of any of claims 1-7, wherein, The surface of the side of the light-transmitting member away from the upper pressing member is a plane.

11. The laser welding tooling of any of claims 1-7, wherein, The laser welding device further comprises a lower pressing member, and the lower pressing member clamps the to-be-welded member together with the light-transmitting member when the laser welding device is working.

12. A laser welding apparatus for welding internal components of a battery device, characterized by, The laser welding device comprises the laser welding device as claimed in any one of claims 1-11.

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