FPC welding equipment and welding methods

Abstract

This invention provides an FPC welding device and method, comprising a fume hood with an internal fume extraction chamber and an opening at the bottom; a pressure head assembly including a pressure head and an elastic element; the pressure head having a through hole, a pressure relief groove on its bottom wall, and an air inlet connected to the through hole; a laser; and a pressure sensor. In the FPC welding device provided by this invention, during the movement of the fume hood, the pressure sensor detects that when the elastic element is compressed, the pressure head is located inside the fume extraction chamber, the FPC board abuts against the opening, and the side wall of the fume hood forms a clearance space adapted to the components on the FPC board, thereby controlling the laser head welding and utilizing the negative pressure in the fume hood to absorb smoke near the welding point. When the elastic element is stretched, the pressure head passes through the opening and is outside the fume extraction chamber, the FPC board separates from the opening, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to an FPC welding apparatus and welding method thereof. Background Technology

[0002] With the development of new energy sources, batteries are being used more and more widely. Power batteries typically operate at high current and voltage, and Flexible Printed Circuit (FPC) welding is a common method for connecting power batteries. This method uses FPC boards to connect batteries, but traditional welding techniques are prone to problems such as incomplete soldering and burn-through.

[0003] To address the aforementioned issues, current battery module FPC board welding devices use a pressure head to press the FPC board firmly before welding with a laser. However, existing welding equipment cannot detect and control the pressing state of the pressure head, and the welding process generates significant fumes, affecting the welding effect of the FPC board. Summary of the Invention

[0004] This invention provides an FPC welding device and welding method to solve the problem of excessive fumes during the welding process, which affects the welding effect of FPC boards.

[0005] This invention provides an FPC welding apparatus for welding FPC boards to welding points on battery modules, comprising:

[0006] A smoke hood with a smoke extraction chamber inside and an opening at the bottom;

[0007] The pressure head assembly includes a pressure head and an elastic element disposed within the smoking chamber; the pressure head is connected to the top of the smoking chamber via the elastic element, a through hole is formed inside the pressure head, a pressure relief groove is provided on the bottom wall of the pressure head, and an air inlet for filling with protective gas is provided on the pressure head; the through hole communicates with the air inlet, and the airflow ejected from the air inlet acts on the welding point.

[0008] A laser is disposed opposite to the smoke extraction cavity, and the laser emitted by the laser passes through the smoke extraction cavity and the through hole in sequence to weld the welding point;

[0009] A pressure sensor is used to detect the pressure between the pressure head and the FPC plate;

[0010] When the elastic element is in a compressed state, the pressure head is located inside the smoke extraction chamber, the FPC board abuts against the opening, and the side wall of the smoke extraction hood forms a clearance space for the components on the FPC board to fit together; when the elastic element is in a stretched state, the pressure head passes through the opening and is located outside the smoke extraction chamber, and the FPC board separates from the opening.

[0011] According to an embodiment of the FPC welding apparatus provided by the present invention, the fume hood includes:

[0012] The unit comprises a top plate and multiple side plates, wherein the multiple side plates are sequentially disposed on the side of the top plate and the multiple side plates are arranged on the bottom surface of the top plate to form the smoke extraction cavity. The side plates are slidable relative to the top plate along the height direction. The side plates that are not in contact with the FPC plate slide downward to the lowest point, and the side plates that are in contact with the FPC plate slide upward accordingly.

[0013] According to an embodiment of the present invention, the airflow injected from the air inlet acts on the welding point, and the angle between the laser emitted by the laser and the airflow is an acute angle.

[0014] According to an embodiment of the present invention, an FPC welding apparatus is provided with an air inlet tube inclined downward on the inner wall of the pressure head. The air inlet tube is connected to the air inlet, so that the air outlet of the air inlet tube acts on the welding point.

[0015] According to an embodiment of the present invention, the FPC welding apparatus further includes: a smoke exhaust pipe disposed on one side of the fume hood, the smoke exhaust pipe being connected to the fume extraction chamber.

[0016] According to an embodiment of the present invention, the FPC welding apparatus further includes a fume extraction device and a filter device, wherein the exhaust pipe is connected to the air inlet in sequence through the fume extraction device and the filter device.

[0017] According to an embodiment of the present invention, the FPC welding apparatus further includes:

[0018] A drive mechanism is connected to one side of the fume hood and is used to drive the fume hood to move.

[0019] A frame, to which the drive mechanism is connected;

[0020] A position sensor, mounted on the frame and electrically connected to the drive mechanism, detects the position of the FPC board and controls the drive mechanism to align the pressure head with the FPC board.

[0021] According to an embodiment of the present invention, an FPC welding apparatus is provided, wherein the displacement device includes:

[0022] A first displacement device and a second displacement device; the first displacement device is provided with a first mounting plate that can slide along the Z-axis direction; the second displacement device is disposed on the first mounting plate, and the second displacement device is provided with a second mounting plate that can slide along the X-axis direction, and the smoke hood is disposed on the second mounting plate.

[0023] According to an embodiment of the present invention, the FPC welding apparatus further includes an insulating plate, and the fume hood is connected to the drive mechanism through the insulating plate.

[0024] This invention provides a welding method for an FPC welding apparatus, comprising:

[0025] During the process of the pressure head moving towards the FPC board, the pressure between the pressure head and the FPC board is obtained;

[0026] When the pressure reaches the preset pressure, the laser is controlled to weld the FPC board, and protective gas is injected into the welding point through the air inlet.

[0027] The FPC welding device provided by this invention, during the movement of the fume hood, is detected by a pressure sensor. When the elastic element is in a compressed state, the pressure head is located inside the fume extraction chamber, and the FPC board abuts against the opening. The side wall of the fume hood forms a clearance space adapted to the components on the FPC board, thereby controlling the laser head welding and utilizing the negative pressure in the fume hood to absorb smoke and dust near the welding point. When the elastic element is in a stretched state, the pressure head passes through the opening and is located outside the fume extraction chamber, the FPC board separates from the opening, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point. Attached Figure Description

[0028] 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 described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of an FPC welding apparatus provided in an embodiment of the present invention from one perspective;

[0030] Figure 2 This is a schematic diagram from another perspective of an embodiment of the FPC welding apparatus provided by the present invention;

[0031] Figure 3 This is a three-dimensional structural schematic diagram of a pressure head assembly provided in an embodiment of the present invention;

[0032] Figure 4This is a front view of a pressure head assembly provided in an embodiment of the present invention;

[0033] Figure 5 This is a schematic flowchart of a welding method for an FPC welding apparatus provided in an embodiment of the present invention;

[0034] Figure label:

[0035] 100. Fume hood; 101. Top plate; 102. Side plate; 200. Pressure head assembly; 201. Pressure head; 2010. Through hole; 202. Elastic element; 203. Pressure relief groove; 300. Exhaust pipe; 400. Drive mechanism; 500. Frame; 600. Insulation plate; 700. Position sensor. Detailed Implementation

[0036] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0037] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] This invention provides an FPC welding apparatus, such as... Figures 1 to 4 As shown, the FPC welding device is used to weld FPC boards to the welding points of the battery module. The FPC welding device includes: a fume hood 100, a pressure head assembly 200, a laser, and a pressure sensor.

[0041] The fume hood 100 has a hollow structure, with a fume extraction chamber formed inside. An opening at the bottom of the fume hood 100 communicates with the fume extraction chamber. This fume extraction chamber can be connected to an external fume extraction device, or a fume extraction device can be directly installed within the fume extraction chamber, thereby creating negative pressure within the chamber. The pressure head assembly 200 mainly includes a pressure head 201 and an elastic element 202. The pressure head 201 acts directly on the FPC board to press it. The pressure head 201 is connected to the top of the fume extraction chamber via the elastic element 202. The elastic element 202 can be a spring or a sheet spring, and one or more can be provided according to user needs. To ensure balanced pressure on the FPC board, when multiple elastic elements 202 are provided, they are symmetrically arranged along the welding points of the FPC board. In this embodiment, two spaced-apart sheets are used to connect the pressure head 201, and the two sheets are correspondingly located on both sides of the welding point.

[0042] To facilitate FPC board welding, a through hole 2010 is formed inside the pressure head 201. A pressure relief groove 203 is provided on the bottom wall of the pressure head 201. The pressure head 201 has an air inlet for charging protective gas. The through hole 2010 is connected to the air inlet, and the airflow ejected from the air inlet acts on the welding point. The number of air inlets can be adjusted accordingly. When multiple air inlets are set, the through hole 2010 is connected to multiple air inlets simultaneously, and the airflow (protective gas) ejected from multiple air inlets acts on the welding point. The laser is set opposite to the fume extraction chamber. The laser emitted by the laser passes through the fume extraction chamber and the through hole 2010 in sequence to weld the welding point.

[0043] To ensure that the pressure between the FPC board and the pressure head 201 is within a preset range during welding, a pressure sensor can be installed at the bottom of the pressure head 201, so that the pressure sensor is located between the pressure head 201 and the FPC board, and the pressure sensor is used to detect the pressure between the pressure head 201 and the FPC board.

[0044] During the movement of the fume hood 100, the pressure sensor detects the pressure between the pressure head 201 and the FPC board. When the elastic element 202 is compressed and the pressure reaches the preset pressure, it indicates that the pressure head 201 has completed its docking with the FPC board. The top of the pressure head 201 is squeezed by the elastic element 202, while the bottom of the pressure head 201 abuts against the FPC board, and the FPC board abuts against the opening. At the same time, the side wall of the fume hood 100 forms a clearance space for the components on the FPC board, preventing the fume hood 100 from affecting the position of the FPC board. This allows for control of the laser head welding and utilizes the negative pressure in the fume hood 100 to absorb the smoke and dust near the welding point, while protective gas is injected into the welding point through the air inlet. At this time, the protective gas can enter the fume extraction chamber through the through hole 2010 under the action of negative pressure, and is discharged together with the smoke and dust.

[0045] When the elastic element 202 is in a stretched state, the pressure head 201 passes through the opening and is located outside the fume extraction chamber, separating the FPC board from the opening. The fume extraction chamber is separated from the through hole 2010, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point, while also stopping the blowing of protective gas.

[0046] The FPC welding apparatus provided by this invention, during the movement of the fume hood 100, is detected by a pressure sensor. When the elastic element 202 is in a compressed state, the pressure head 201 is located inside the fume extraction chamber, and the FPC board abuts against the opening. The side wall of the fume hood 100 forms a clearance space adapted to the components on the FPC board, thereby controlling the laser head welding and utilizing the negative pressure in the fume hood 100 to absorb smoke and dust near the welding point. When the elastic element 202 is in a stretched state, the pressure head 201 passes through the opening and is located outside the fume extraction chamber, the FPC board separates from the opening, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point.

[0047] It should be noted that, depending on the user's needs, a pressure sensor can also be installed between the fume hood 100 and the FPC board to detect the pressure between the FPC board and the fume hood 100.

[0048] When the elastic element 202 is in a compressed state and the pressure reaches the preset pressure, it indicates that the pressure head 201 has completed docking with the FPC board, thereby controlling the laser head welding. The negative pressure in the fume hood 100 absorbs the smoke and dust near the welding point, and protective gas is injected into the welding point through the air inlet. Conversely, when the elastic element 202 is in a stretched state and the pressure has not reached the preset pressure, it indicates that the pressure head 201 has not completed docking with the FPC board. The laser head is then controlled to stop welding, and fume extraction near the welding point is stopped, along with the injection of protective gas.

[0049] This invention provides an FPC board welding device, such as... Figures 1 to 4 As shown, the smoke hood 100 includes a top plate 101 and multiple side plates 102.

[0050] In this embodiment, multiple side plates 102 are sequentially arranged on the sides of the top plate 101. The multiple side plates 102 surround the bottom surface of the top plate 101 to form a fume extraction cavity. The side plates 102 are slidable relative to the top plate 101 along the height direction. During welding, since the FPC boards come into contact with the side plates 102, to ensure airtightness during welding and to avoid excessive pressure on the components on the FPC boards from contacting the side plates 102, the side plates 102 that are not in contact with the FPC boards slide downwards to the lowest point. Correspondingly, the side plates 102 that are in contact with the FPC boards slide upwards under the support of the FPC boards, thereby ensuring airtightness during welding and avoiding excessive pressure on the components on the FPC boards from contacting the side plates 102.

[0051] In another embodiment, an elastic plate can be provided on the top surface of the side plate 102. That is, each side plate 102 is connected to the bottom surface of the top plate 101 through an elastic plate, and the elastic plates are arranged sequentially to cooperate with each side plate 102 to form a smoke extraction cavity on the bottom surface of the top plate 101. When the FPC board abuts against the side plate 102, the elastic plate corresponding to the side plate 102 supported by the FPC board is compressed, and the side plate 102 moves upward accordingly. This ensures airtightness during welding while avoiding excessive pressure between the components on the FPC board and the side plate 102. When the FPC board separates from the side plate 102, the elastic plate corresponding to the side plate 102 is stretched, and the side plate 102 moves downward.

[0052] This invention provides an FPC board welding device, such as... Figures 1 to 4 As shown, the airflow ejected from the inlet acts on the welding point. The angle between the laser emitted by the laser and the airflow is acute, and this acute angle ensures that the airflow is directed towards the welding point. An inflation tube is inclined downwards on the inner wall of the pressure head 201, and the inflation tube is connected to the inlet, ensuring that the outlet of the inflation tube acts on the welding point. By using the inflation tube, the direct blowing of the protective gas onto the laser can be effectively prevented.

[0053] Furthermore, the peripheral wall of the pressure head 201 is provided with multiple spaced air inlets, and the through hole 2010 is connected to each air inlet. The airflow ejected from each air inlet acts on the welding point, and the angle between the laser emitted by the laser and each airflow is acute. Correspondingly, multiple air filling tubes are inclined downward on the inner wall of the pressure head 201, and each air filling tube is connected to a corresponding air inlet, so that the air outlet of the air filling tube acts on the welding point. By providing multiple air filling tubes, it is possible to effectively prevent the protective gas protecting any one of the air inlets from directly blowing onto the laser.

[0054] Meanwhile, the through hole 2010 has a large diameter end and a small diameter end. The large diameter end of the through hole 2010 is located on the side of the pressure head 201 close to the smoke hood 100, and the small diameter end of the through hole 2010 is located on the side of the pressure head 201 away from the smoke hood 100.

[0055] During the movement of the fume hood 100, the pressure sensor detects the pressure between the pressure head 201 and the FPC board. When the elastic element 202 is in a compressed state and the pressure reaches the preset pressure, it indicates that the pressure head 201 has completed the docking with the FPC board. The top of the pressure head 201 is squeezed by the elastic element 202, and the bottom of the pressure head 201 abuts against the FPC board. The FPC board abuts against the opening. At the same time, the side wall of the fume hood 100 forms a clearance space for the components on the FPC board to be adapted, so as to avoid the fume hood 100 affecting the position of the FPC board. This allows for control of laser head welding, and the negative pressure in the fume hood 100 absorbs the smoke and dust near the welding point, and protective gas is injected into the welding point through the air inlet. By changing the size of the two ends of the through-hole 2010, the smaller diameter end of the through-hole 2010 creates greater resistance as the protective gas flows through it. Most of the protective gas, after flowing towards the welding point, exits through the larger diameter end of the through-hole 2010. Under negative pressure, the protective gas can enter the fume extraction chamber through the larger diameter end of the through-hole 2010, where it is discharged along with the smoke. When the elastic element 202 is in a stretched state, the pressure head 201 passes through the opening and is located outside the fume extraction chamber, separating the FPC board from the opening. The fume extraction chamber separates from the through-hole 2010, thereby controlling the laser to stop welding, stopping fume extraction near the welding point, and stopping the blowing of protective gas.

[0056] To facilitate the docking of the pressure head 201, the bottom of the pressure head 201 is constructed with a positioning groove for matching the FPC board; when the elastic member 202 is in a compressed state, the positioning groove abuts against the FPC board. When the elastic member 202 is in a stretched state, the positioning groove separates from the FPC board.

[0057] The FPC welding apparatus also includes a smoke exhaust pipe 300. The smoke exhaust pipe 300 is located on one side of the fume extraction hood 100 and is connected to the fume extraction chamber. The smoke exhaust pipe 300 uses negative pressure to expel smoke and dust from the fume extraction chamber.

[0058] Specifically, the FPC welding device also includes a fume extraction device and a filtration device. A fume extraction pipe 300 is connected to the fume extraction hood 100, with one end of the pipe connected to the fume extraction chamber. The fume extraction device works in conjunction with the pipe to provide a negative pressure environment for the chamber. The filtration device filters smoke and dust, and the other end of the pipe is connected to the air inlet via both the fume extraction device and the filtration device.

[0059] In this embodiment, during the laser head welding process, the negative pressure in the fume hood 100 is used to absorb the smoke and dust near the welding point, and protective gas is injected into the welding point through the air inlet. At this time, the protective gas can enter the fume extraction chamber through the through hole 2010 under the action of negative pressure, and together with the smoke and dust, it passes through the exhaust pipe 300, the fume extraction device, and finally enters the filtration device. After the filtration device filters the gas, it can be pressurized and re-enter the through hole 2010 of the pressure head 201 through the air inlet. By setting up the exhaust pipe 300, the fume extraction device, and the filtration device, not only is the smoke and dust effectively removed, but the protective gas can also be recycled, reducing equipment wear.

[0060] Based on the above embodiments, in one embodiment provided in this application, the FPC welding apparatus further includes: a drive mechanism 400, a frame 500, and a position sensor 700.

[0061] The drive mechanism is connected to one side of the fume hood 100 and is used to drive the fume hood 100 to move. The drive mechanism is connected to the frame and the position sensor 700 is installed on the frame and electrically connected to the drive mechanism. By detecting the position of the FPC board, the drive mechanism is controlled to make the pressure head 201 align with the FPC board.

[0062] The driving mechanism includes: a first displacement device and a second displacement device; the first displacement device and the second displacement device may be lead screws, the first displacement device is provided with a first mounting plate that can slide along the Z-axis direction; the second displacement device is set on the first mounting plate, the second displacement device is provided with a second mounting plate that can slide along the X-axis direction, and the second mounting plate is provided with a fume hood 100.

[0063] Specifically, by setting two displacement devices, the first displacement device can adjust the height of the fume hood 100, thereby adjusting the relative height between the pressure head 201 and the FPC board, while the second displacement device can adjust the horizontal position of the fume hood 100, thereby adjusting the corresponding position of the pressure head 201 and the FPC board, so that the pressure head 201 can be aligned with the FPC board. The position sensor 700 can be a vision sensor, which is used to detect the position of the FPC board, so that the pressure head 201 can be aligned with the FPC board and weld the FPC board to the welding points of the battery module.

[0064] During operation, the position sensor 700 detects the position of the FPC board and first controls the second displacement device to align the pressure head 201 with the FPC board. Then, the first displacement device controls the relative height between the pressure head 201 and the FPC board. As the fume hood 100 moves along the height direction, the pressure sensor detects the pressure between the pressure head 201 and the FPC board. When the elastic element 202 is compressed and the pressure reaches the preset pressure, it indicates that the pressure head 201 has completed docking with the FPC board. The top of the pressure head 201 is squeezed by the elastic element 202, while the bottom of the pressure head 201 abuts against the FPC board, and the FPC board abuts against the opening. At the same time, the side wall of the fume hood 100 forms a clearance space for the components on the FPC board, preventing the fume hood 100 from affecting the position of the FPC board. This allows for control of the laser head welding, and the negative pressure in the fume hood 100 absorbs the smoke and dust near the welding point, while protective gas is injected into the welding point through the air inlet. At this time, the protective gas can enter the fume extraction chamber through the through hole 2010 under negative pressure, and be discharged together with the smoke. When the elastic element 202 is in a stretched state, the pressure head 201 passes through the opening and is located outside the fume extraction chamber, and the FPC board is separated from the opening. The fume extraction chamber is separated from the through hole 2010, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point, while also stopping the blowing of protective gas.

[0065] The welding device also includes an insulating plate 600, and a fume hood 100 is connected to the drive mechanism via the insulating plate 600. The insulating plate 600 can be made of rubber or other insulating materials, so that the pressure head 201, the elastic element 202 and the fume hood 100 are all connected to the drive mechanism via the insulating plate 600, thus preventing the pressure head 201 and the elastic element 202 from becoming electrified during the welding process and affecting the welding.

[0066] The present invention also provides a welding method for an FPC welding apparatus, wherein the FPC welding apparatus is as follows: Figures 1 to 4 As shown, I will not repeat myself here.

[0067] like Figure 5 As shown, the welding method of this FPC welding apparatus includes the following steps:

[0068] Step S510: During the process of the pressure head moving towards the FPC board, the pressure between the pressure head and the FPC board is obtained.

[0069] Step S520: When the pressure reaches the preset pressure, control the laser to weld the FPC board, and inject protective gas into the welding point through the air inlet.

[0070] Specifically, during the pressing motion of the pressure head 201 towards the FPC board, the pressure sensor detects the pressure between the pressure head 201 and the FPC board. When the elastic element 202 is compressed and the pressure reaches the preset pressure, it indicates that the pressure head 201 has successfully docked with the FPC board. The top of the pressure head 201 is squeezed by the elastic element 202, while the bottom of the pressure head 201 abuts against the FPC board, and the FPC board abuts against the opening. Simultaneously, the sidewall of the fume hood 100 forms a clearance space for the components on the FPC board, preventing the fume hood 100 from affecting the position of the FPC board. This allows for control of the laser head welding and utilizes the negative pressure in the fume hood 100 to absorb smoke and dust near the welding point, while protective gas is introduced into the welding point through the air inlet. At this time, the protective gas can enter the fume extraction chamber through the through hole 2010 under the action of negative pressure, and is discharged along with the smoke and dust.

[0071] When the elastic element 202 is in a stretched state, the pressure head 201 passes through the opening and is located outside the fume extraction chamber, separating the FPC board from the opening. The fume extraction chamber is separated from the through hole 2010, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point, while also stopping the blowing of protective gas.

[0072] The welding method of the FPC welding device provided by this invention, during the movement of the fume hood 100, is detected by a pressure sensor. When the elastic element 202 is in a compressed state, the pressure head 201 is located inside the fume extraction chamber, and the FPC board abuts against the opening. The side wall of the fume hood 100 forms a clearance space adapted to the components on the FPC board, thereby controlling the laser head welding and using the negative pressure in the fume hood 100 to absorb smoke and dust near the welding point. When the elastic element 202 is in a stretched state, the pressure head 201 passes through the opening and is located outside the fume extraction chamber, the FPC board separates from the opening, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; 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; and these 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.

[0074] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. An FPC welding apparatus, characterized in that, Used for soldering FPC boards to the solder joints of battery modules, including: A smoke hood has an internal smoke extraction cavity and an opening at its bottom. The smoke hood includes a top plate and multiple side plates, which are sequentially arranged on the sides of the top plate. The multiple side plates surround the bottom surface of the top plate to form the smoke extraction cavity. The side plates are slidable relative to the top plate along the height direction. The pressure head assembly includes a pressure head and an elastic element disposed within the smoking chamber; the pressure head is connected to the top of the smoking chamber via the elastic element, a through hole is formed inside the pressure head, a pressure relief groove is provided on the bottom wall of the pressure head, and an air inlet for filling with protective gas is provided on the pressure head; the through hole communicates with the air inlet, and the airflow ejected from the air inlet acts on the welding point. A laser is disposed opposite to the smoke extraction cavity, and the laser emitted by the laser passes through the smoke extraction cavity and the through hole in sequence to weld the welding point; A pressure sensor is used to detect the pressure between the pressure head and the FPC board; the pressure between the pressure head and the FPC board is acquired during the process of the pressure head moving towards the FPC board. When the elastic element is in a compressed state, the pressure head is located inside the smoke extraction chamber, the FPC board abuts against the opening, and the side wall of the smoke extraction hood forms a clearance space for the components on the FPC board to fit together; when the elastic element is in a stretched state, the pressure head passes through the opening and is located outside the smoke extraction chamber, and the FPC board separates from the opening; when the pressure reaches the preset pressure, the laser is controlled to weld the FPC board, and protective gas is injected into the welding point through the air inlet.

2. The FPC welding apparatus according to claim 1, characterized in that, The side panel that is not in contact with the FPC board slides down to the lowest point, and the side panel that is in contact with the FPC board slides up accordingly.

3. The FPC welding apparatus according to claim 1, characterized in that, The airflow injected from the air inlet acts on the welding point, and the angle between the laser emitted by the laser and the airflow is an acute angle.

4. The FPC welding apparatus according to claim 3, characterized in that, An air inlet tube is inclined downward on the inner wall of the pressure head. The air inlet tube is connected to the air inlet so that the air outlet of the air inlet tube acts on the welding point.

5. The FPC welding apparatus according to claim 1, characterized in that, The FPC welding device further includes a smoke exhaust pipe disposed on one side of the fume hood, the smoke exhaust pipe being connected to the fume extraction chamber.

6. The FPC welding apparatus according to claim 5, characterized in that, The FPC welding device further includes a fume extraction device and a filter device, wherein the exhaust pipe is connected to the air inlet in sequence through the fume extraction device and the filter device.

7. The FPC welding apparatus according to claim 1, characterized in that, The FPC welding apparatus also includes: A drive mechanism is connected to one side of the smoke hood and is used to drive the smoke hood to move. A frame, to which the drive mechanism is connected; A position sensor, mounted on the frame and electrically connected to the drive mechanism, detects the position of the FPC board and controls the drive mechanism to align the pressure head with the FPC board.

8. The FPC welding apparatus according to claim 7, characterized in that, The drive mechanism includes: A first displacement device and a second displacement device; the first displacement device is provided with a first mounting plate that can slide along the Z-axis direction; the second displacement device is disposed on the first mounting plate, and the second displacement device is provided with a second mounting plate that can slide along the X-axis direction, and the smoke hood is disposed on the second mounting plate.

9. The FPC welding apparatus according to claim 7, characterized in that, The FPC welding device further includes an insulating plate, and the fume hood is connected to the drive mechanism through the insulating plate.

10. A welding method using the FPC welding apparatus as described in any one of claims 1-9, characterized in that, include: During the process of the pressure head moving towards the FPC board, the pressure between the pressure head and the FPC board is obtained; When the pressure reaches the preset pressure, the laser is controlled to weld the FPC board, and protective gas is injected into the welding point through the air inlet.

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