A welding device and method for power battery integrated busbar

Abstract

This invention relates to the field of new energy vehicle manufacturing technology. The invention discloses a welding apparatus and method for power battery integrated busbars. The welding apparatus includes a laser, an optical path that converts the laser output spot into a strip-shaped laser spot, a fixed platform for flattening and fixing the CCS (Computer Integrated Battery Structure), and a drive mechanism for horizontally reciprocating the fixed platform. The fixed platform, mounted on a base, has through holes on its placement surface, each hole connected to a vacuum pump. During welding, the vacuum pump creates negative pressure in the through holes to adsorb and fix the CCS. The drive mechanism drives the fixed platform to move the welding position on the CCS to the position of the strip-shaped laser spot. Since FCC (Fuel Cell Cross-Section) and FDC (Fuel Cell Direct Distributed) branch plates can be used as the integrated busbar of the power battery, material costs can be reduced, and welding difficulty can be lowered.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a welding device and method for an integrated busbar of a power battery. Background Technology

[0002] New energy vehicles typically use ternary lithium or lithium iron phosphate batteries for energy storage. These batteries usually have a relatively large capacity, typically around 50-120 kWh. For ease of maintenance, the battery packs in new energy vehicles often consist of several small battery groups connected in series and parallel to power the vehicle. Because new energy vehicles continuously discharge during operation, battery overheating is a potential issue. Therefore, it is necessary to collect the operating temperature of each battery group and use a controller to manage the discharge of batteries in groups with excessively high temperatures, thus preventing overheating and shortening battery lifespan.

[0003] Currently, new energy vehicle power batteries use FPC (Flexible Printed Circuit) as CCS (Cells Contact System) for signal acquisition such as temperature sampling and cell voltage sampling. FPC is a highly reliable and flexible printed circuit board made of polyimide or polyester film as substrate. However, the manufacturing process of FPC is complex and the cost is high. When using FPC as CCS, the cost is high and the welding process is complex and difficult. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a welding device and method for power battery integrated busbars, wherein the welding device for power battery integrated busbars can improve welding efficiency and welding quality consistency, and reduce costs.

[0005] To address the aforementioned technical problems, this invention provides a welding device for integrated busbars of power batteries. This welding device includes a laser, an optical path that converts the laser output spot into a strip-shaped laser spot, a fixed platform for flattening and fixing the CCS (Computer Integrated Busbar), and a drive mechanism for horizontally reciprocating the fixed platform. The fixed platform, mounted on a base, has through holes on its placement surface, each hole connected to a vacuum pump. During welding, the vacuum pump creates negative pressure in the through holes to adsorb and fix the CCS. The drive mechanism drives the fixed platform to move, shifting the welding position on the CCS to the location of the strip-shaped laser spot.

[0006] In a preferred embodiment, the through holes are arranged in an array.

[0007] In a preferred embodiment, a movable guide rail is provided between the base and the fixed platform.

[0008] In a preferred embodiment, the drive mechanism includes a linear motor.

[0009] In a preferred embodiment, the welding apparatus further includes a spot switching mechanism that outputs a circular spot and automatically switches between circular and strip-shaped spot outputs.

[0010] In a preferred embodiment, the light spot switching mechanism includes a conversion sphere, which has an input light channel and two output light channels, as well as a first total reflection mirror and a second total reflection mirror to change the laser light path of the input light channel.

[0011] This invention provides a welding method for an integrated busbar of a power battery, which is used for a branch plate for signal acquisition, including: The fixing adhesive step involves applying adhesive around the welding position of the branch piece on the FCC to fix the branch piece, forming an adhesive on the FCC. The UV curing step uses ultraviolet light to cure the adhesive at the welding position of the branch piece on the FCC. The solder paste application step involves applying solder paste to the soldering locations of the branch plates on the FCC. In the component placement step, the FDC branch piece is placed on the cured adhesive dotting position, so that the part of the FDC branch piece to be soldered coincides with the solder paste, and the FDC branch piece is bonded and fixed to the cured adhesive. In the laser welding step, a special-shaped laser spot is used to sequentially irradiate each solder joint on the branch chip, causing the solder paste to melt and form a signal path between the FDC and FCC, thus completing the integrated busbar welding.

[0012] As a preferred embodiment, the laser welding process also includes a flattening and fixing step to fix the area around the branch piece weld point before welding.

[0013] In a preferred embodiment, the curing adhesive provides a one-time bonding and fixation.

[0014] As a preferred embodiment, the applied adhesive is inspected after the application of the fixing adhesive.

[0015] As a preferred embodiment, the amount and / or shape of the solder paste are detected after the solder paste application step.

[0016] In a preferred embodiment, the dispensing is a closed circle or rectangle.

[0017] In a preferred embodiment, the patching step further includes applying 2-3KG of pressure to the branch patch for 2-4 minutes to bond and fix the branch patch to the cured adhesive.

[0018] This invention discloses a welding apparatus and method for an integrated busbar of a power battery. The welding apparatus includes a laser, an optical path that converts the laser output spot into a strip-shaped laser spot, a fixed platform for flattening and fixing the CCS (Computer-on-Semiconductor System), and a drive mechanism for horizontally reciprocating the fixed platform. The fixed platform, mounted on a base, has through holes on its placement surface, each hole connected to a vacuum pump. During welding, the vacuum pump creates negative pressure in the through holes to adsorb and fix the CCS. The drive mechanism drives the fixed platform to move the welding position on the CCS to the position of the strip-shaped laser spot. Since FCC (Fuel Cell Cross-Section) and FDC (Fuel Cell Direct Distributed) branch plates can be used as the integrated busbar of the power battery, material costs can be reduced while welding difficulty is also lowered. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the description only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an embodiment of the welding method for the integrated busbar of a power battery.

[0021] Figure 2 This is a schematic diagram of the welding method for the integrated busbar of a power battery.

[0022] Figure 3 for Figure 2 Schematic diagram of the cross-section along the AA direction.

[0023] Figure 4 This is a schematic flowchart of an embodiment of a welding method for an integrated busbar of a power battery.

[0024] Figure 5 This is a schematic diagram of another embodiment of the welding method for the integrated busbar of a power battery.

[0025] The realization of the objectives, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The claims of the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of the present invention.

[0027] It should be understood that, in the description of the embodiments of the present invention, all directional indicating terms, such as "up," "down," "left," "right," "front," and "back," indicate the orientation or positional relationship based on the orientation and positional relationship shown in the accompanying drawings or the orientation or positional relationship commonly used when the product is in use. These terms are merely for the purpose of simplifying the description of the present invention and do not explicitly or implicitly suggest that the device, element, or component referred to must have a specific orientation or specific orientational structure, and should not be construed as a limitation of the present invention. They are only used to explain the relative positional relationships and movements between the components shown in the accompanying drawings. When this specific orientation changes, the directional indication may also change accordingly.

[0028] Furthermore, in this invention, ordinal numbers such as "first" and "second" are used for distinguishing purposes only and should not be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, the features referred to as "first" and "second" may explicitly or implicitly include at least one of those technical features. In the description of this invention, "a plurality of" means at least two, i.e., two or more, unless otherwise explicitly defined; "at least one" means one or more.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-in" should be interpreted broadly. For example, they can refer to a relatively fixed positional relationship between components, or a physically fixed connection between components; they can be detachable connections or integral structures; they can be mechanical connections or electrical signal connections; they can be direct connections or indirect connections through intermediate media or components; they can refer to the internal communication of two elements or the interaction between two elements. Unless otherwise explicitly limited in the specification, other interpretations will not achieve the corresponding functions or effects. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0030] If the controllers or control circuits involved in this invention are conventional control technologies or units for those skilled in the art, such as the control circuits of the controllers, they can be implemented by those skilled in the art using existing methods, such as simple programming. Regarding software or programs that work with hardware to achieve control results, unless the description provides a detailed explanation of the control process of the software or programs involved, this pertains to the use of existing technology or conventional techniques for those skilled in the art. The power supply also employs existing technology in the art. Furthermore, since the main inventive aspect of this invention lies in the improvement of the mechanical device, this invention will not provide a detailed explanation of the specific circuit control relationships and circuit connections.

[0031] This invention discloses many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0032] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0033] like Figures 1-3 As shown, this invention provides an embodiment of a welding method for an integrated busbar of a power battery.

[0034] The welding method for the integrated busbar of the power battery includes a laser, an optical path that converts the laser output spot into a strip laser spot, a fixed platform that flattens and fixes the CCS, and a drive mechanism that moves the fixed platform horizontally back and forth. The fixed platform mounted on the base has through holes on its placement surface, and each through hole is connected to a vacuum pump. During welding, the vacuum pump creates a negative pressure in the through holes to adsorb and fix the CCS. The drive mechanism drives the fixed platform to move and move the welding position on the CCS to the position of the strip laser spot.

[0035] Specifically, the through holes are arranged in an array, and a movable guide rail is provided between the base and the fixed platform. The drive mechanism includes a linear motor. The welding device also includes a spot switching mechanism that outputs a circular spot and automatically switches between circular and strip-shaped spot outputs.

[0036] The light spot switching mechanism includes a conversion sphere, which has an input light channel and two output light channels, as well as a first total reflection mirror and a second total reflection mirror to change the laser light path of the input light channel. Each total reflection mirror corresponds to an output light channel.

[0037] Since FCC and FDC branch plates can be used as the integrated busbar of the power battery, material costs can be reduced, while welding difficulty can be reduced.

[0038] like Figures 4-5 As shown, this invention provides an embodiment of a welding method for an integrated busbar of a power battery. This welding method for an integrated busbar of a power battery is used for a branch plate of signal acquisition, including: The first step involves applying adhesive to fix the branch pieces around the welding positions on the FCC, forming an adhesive layer on the FCC. The second step involves using ultraviolet light to cure the adhesive at the welding positions on the FCC. The solder paste application step involves applying solder paste to the soldering locations of the branch plates on the FCC. In the component placement step, the FDC branch piece is placed on the cured adhesive dotting position, so that the part of the FDC branch piece to be soldered coincides with the solder paste, and the FDC branch piece is bonded and fixed to the cured adhesive. In the laser welding step, a specially shaped laser spot is used to sequentially irradiate each solder joint on the branch chip, melting the solder paste to form a signal path between the FDC and FCC, thus completing the integrated busbar welding. As a preferred embodiment, the laser welding step also includes a flattening and fixing step to secure the area around the solder joints on the branch chip before welding.

[0039] In a preferred embodiment, the curing adhesive provides a one-time bonding and fixation.

[0040] As a preferred embodiment, the applied adhesive is inspected after the application of the fixing adhesive.

[0041] As a preferred embodiment, the amount and / or shape of the solder paste are detected after the solder paste application step.

[0042] In a preferred embodiment, the dispensing is a closed circle or rectangle.

[0043] In a preferred embodiment, the patching step further includes applying 2-3KG of pressure to the branch patch for 2-3 minutes to bond and fix the branch patch to the cured adhesive.

[0044] Since FCC and FDC branch plates can be used as the integrated busbar of the power battery, material costs can be reduced, while welding difficulty can be reduced.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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 invention.

Claims

1. A welding device for an integrated busbar of a power battery, characterized in that, The device includes a laser, an optical path that converts the laser output spot into a strip laser spot, a fixed platform that flattens and fixes the CCS, and a drive mechanism that moves the fixed platform horizontally back and forth. The fixed platform mounted on the base has through holes on its placement surface, each of which is connected to a vacuum pump. During welding, the vacuum pump creates a negative pressure in the through holes to adsorb and fix the CCS. The drive mechanism drives the fixed platform to move and move the welding position on the CCS to the position of the strip laser spot.

2. The welding device for the integrated busbar of the power battery according to claim 1, characterized in that, The through holes are arranged in an array.

3. The welding device for the integrated busbar of the power battery according to claim 1, characterized in that, A movable guide rail is provided between the base and the fixed platform.

4. The welding device for the integrated busbar of the power battery according to claim 1, characterized in that, The drive mechanism includes a linear motor.

5. The welding device for the integrated busbar of the power battery according to claim 1, characterized in that, The welding device also includes a spot switching mechanism that outputs a circular spot and automatically switches between circular and strip-shaped spot outputs.

6. The welding device for the integrated busbar of the power battery according to claim 1, characterized in that, The light spot switching mechanism includes a conversion sphere, which has an input light channel and two output light channels, as well as a first total reflection mirror and a second total reflection mirror to change the laser light path of the input light channel.

7. A welding method for an integrated busbar of a power battery, comprising welding a branch plate FDC for signal acquisition onto an FCC, including, The fixing adhesive step involves applying adhesive around the welding position of the branch piece on the FCC to fix the branch piece, forming an adhesive on the FCC. The UV curing step uses ultraviolet light to cure the adhesive at the welding position of the branch piece on the FCC. The solder paste application step involves applying solder paste to the soldering locations of the branch plates on the FCC. In the component placement step, the FDC branch piece is placed on the cured adhesive dotting position, so that the part of the FDC branch piece to be soldered coincides with the solder paste, and the FDC branch piece is bonded and fixed to the cured adhesive. In the laser welding step, a special-shaped laser spot is used to sequentially irradiate each solder joint on the branch chip, causing the solder paste to melt and form a signal path between the FDC and FCC, thus completing the integrated busbar welding.

8. The welding method for the integrated busbar of the power battery according to claim 7, characterized in that, The laser welding process also includes a flattening and fixing step to fix the area around the branch piece weld point before welding.

9. The welding method for the integrated busbar of the power battery according to claim 7, characterized in that, The curing adhesive is a one-time bonding and fixing adhesive.

10. The welding method for the integrated busbar of the power battery according to claim 8, characterized in that, The fixing adhesive testing step involves testing the applied adhesive after the fixing adhesive application process.

11. The welding method for the integrated busbar of the power battery according to claim 7, characterized in that, The solder paste inspection step is a step that checks the amount and / or shape of solder paste after the solder paste application step.

12. The welding method for the integrated busbar of the power battery according to claim 7 or 8, characterized in that, The adhesive dispensing is based on the shape of the solder pad.

13. The welding method for the integrated busbar of the power battery according to claim 1, characterized in that, The patching step also includes applying 2-5KG of pressure to the branch patch to bond and fix it to the cured adhesive.

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