Battery pole piece welding apparatus

Abstract

The application discloses a battery pole piece welding device, which comprises a battery positioning tool for clamping a battery to be processed, a first pole piece pressing head assembly, a second pole piece pressing head assembly and a welding tool. The first pole piece pressing head assembly comprises a first cylinder, a first guide rail, a first laser pressing plate and a plurality of first copper nozzles fixed on the first laser pressing plate and corresponding to the first side surface of the battery, and the first cylinder is used for driving the first laser pressing plate to move on the first guide rail. The second pole piece pressing head assembly comprises a second cylinder, a second guide rail, a second laser pressing plate and a plurality of second copper nozzles floatingly arranged on the second laser pressing plate and corresponding to the second side surface of the battery, and the second cylinder is used for driving the second laser pressing plate to move on the second guide rail. The welding tool comprises a manipulator and a welding galvanometer, the manipulator drives the welding galvanometer to move between the first pole piece pressing head assembly and the second pole piece pressing head assembly, so that the first copper nozzles and the second copper nozzles are used for welding the to-be-welded area on the battery. The battery pole piece welding device has high welding efficiency and is safe to operate.

Description

Technical Field

[0001] This invention relates to the field of battery processing technology, and in particular to a battery electrode welding device. Background Technology

[0002] A lithium-ion battery is a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. It is one of the most commonly used battery types today, possessing advantages such as light weight, high energy density, fast charging speed, and long cycle life, and is widely used in electronic devices, electric vehicles, aerospace, and other fields. Currently, most high-capacity lithium-ion batteries are manufactured by welding together multiple smaller-capacity cells.

[0003] In existing technologies, common cell welding methods include soldering, iron soldering, and laser welding. Among these, laser welding is the mainstream method due to its advantages of fast welding speed, high welding quality, and aesthetically pleasing weld joints. Existing lithium battery laser welding equipment can be broadly divided into two categories: one with a fixed laser welding head, requiring workers to repeatedly move the lithium battery to align the electrode plates with the laser welding head, which is cumbersome; the other type uses a movable laser welding head, allowing the laser welding head to move along a preset trajectory. Workers simply place the lithium battery pack in the designated position for welding. However, with this type of equipment, manual pressing of the copper-aluminum composite sheet placed on the lithium battery pack is required to prevent displacement during welding, making it unsafe to use, as users are easily burned by the laser in case of operational errors. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a battery electrode welding device that can perform welding on different areas of a battery, with high welding efficiency and safe operation.

[0005] This disclosure provides a battery electrode welding apparatus, comprising:

[0006] A battery positioning fixture is used to clamp the battery to be processed, so as to expose a first side of the battery and a second side opposite to the first side;

[0007] The first electrode pressing head assembly is located on one side of the battery positioning fixture, including a first cylinder, a first guide rail, a first laser pressing plate slidably disposed on the first guide rail, and a plurality of first copper nozzles fixed on the first laser pressing plate and corresponding to the welding area on the first side of the battery. The first cylinder is connected to the first laser pressing plate and is used to drive the first laser pressing plate to move on the first guide rail so as to drive the first copper nozzles to abut against or retract from the welding area on the first side of the battery.

[0008] The second electrode pressing head assembly is located on the other side of the battery positioning fixture. It includes a second cylinder, a second guide rail, a second laser pressing plate slidably disposed on the first guide rail, and a plurality of second copper nozzles floating on the second laser pressing plate and corresponding to the area to be welded on the second side of the battery. The second cylinder is connected to the second laser pressing plate and is used to drive the second laser pressing plate to move on the second guide rail so that the second copper nozzles abut against or retract from the area to be welded on the second side of the battery.

[0009] The welding fixture includes a robotic arm and a welding galvanometer mounted at the end of the robotic arm. The robotic arm drives the welding galvanometer to move between the first electrode pressing head assembly and the second electrode pressing head assembly to perform welding on the area to be welded on the battery through the first copper nozzle and the second cylindrical nozzle.

[0010] Optionally, the battery positioning fixture includes a fixture base, fixture columns supported at both ends of the fixture base, and a fixture cover plate covering the fixture columns. The fixture cover plate, the fixture columns, and the fixture base together form a battery mounting cavity for accommodating the battery.

[0011] Optionally, the upper end face of the tooling base is provided with a positioning block protruding into the battery mounting cavity. The positioning block is embedded in the bottom surface of the battery to restrict the battery from sliding axially. The lower end face of the tooling cover is provided with a pressing block protruding into the battery mounting cavity. The pressing block abuts against the top surface of the battery to restrict the battery from moving radially.

[0012] Optionally, the first copper nozzle is provided with a first channel, a first air passage, and a first air duct. The first channel extends through two opposite sides of the first copper nozzle, and the first outlet of the first channel faces the first side of the battery. The first inlet of the first channel is used to receive the laser beam from the welding galvanometer and allow the laser beam to pass through the first channel to reach the area to be welded on the first side of the battery. The first air passage extends downward from the upper end of the first copper nozzle to communicate with the first channel, and the first air duct extends upward from the lower end of the first copper nozzle to communicate with the first channel.

[0013] Optionally, the inner diameter of the first copper nozzle decreases from the first inlet to the first outlet; the first air passage is inclined from the upper end of the first copper nozzle toward the first outlet of the first channel, so that the protective gas delivered by the first air passage can reach the first outlet; the connection between the first air passage and the first channel is closer to the first outlet than the connection between the first air duct and the first channel.

[0014] Optionally, the first electrode pressure head assembly further includes a first protection manifold block and a first dust removal manifold block. The first protection manifold block is provided with a first gas channel, which connects the first air duct to the gas supply device. The first dust removal manifold block is provided with a first purging channel, which connects the first air duct to the dust removal device.

[0015] Optionally, each of the second copper nozzles is connected to the second laser pressure plate via an elastic element. During the process of the second cylinder driving the second copper nozzle to abut against the second side of the battery, the elastic element is compressed and deformed by the squeezing force of the second copper nozzle.

[0016] Optionally, the second copper nozzle is provided with a second channel, a second air duct, and a second air duct. The second channel extends through two opposite sides of the second copper nozzle, and the second outlet of the second channel faces the second side of the battery. The second inlet of the second channel is used to receive the laser beam from the welding galvanometer and allow the laser beam to pass through the second channel to reach the area to be welded on the second side of the battery. The second air duct extends downward from the upper end of the second copper nozzle to communicate with the second channel, and the second air duct extends upward from the lower end of the second copper nozzle to communicate with the second channel.

[0017] Optionally, the inner diameter of the second copper nozzle decreases from the second inlet to the second outlet; the second air passage is inclined from the upper end of the second copper nozzle toward the second outlet of the second channel, so that the protective gas delivered by the second air passage can reach the second outlet; the connection between the second air passage and the second channel is closer to the second outlet than the connection between the second air passage and the second channel.

[0018] Optionally, the second electrode pressure head assembly further includes a second protection manifold block and a second dust removal manifold block. The second protection manifold block is provided with a second gas channel, which connects the second air duct to the gas supply device. The second dust removal manifold block is provided with a second purging channel, which connects the second air duct to the dust removal device.

[0019] Implementing the above plan will have the following beneficial effects:

[0020] This disclosure uses a battery positioning fixture to position the battery to be welded. A first electrode pressing head assembly and a second electrode pressing head assembly are correspondingly set on both sides of the battery to be welded. The first and second electrode pressing head assemblies are used to press against the battery so that the electrodes on the battery contact the battery terminals. Then, a robotic arm drives a welding galvanometer to perform laser welding on the area to be welded on the battery. This disclosure realizes the automation of laser welding, saves labor costs, and eliminates the need to flip and repeatedly position the battery when welding multiple sides, thereby improving welding efficiency. Laser welding is performed through the first and second copper nozzles, resulting in precise positioning, aesthetically pleasing welds, and a small heat-affected zone at the welded area. Attached Figure Description

[0021] Figure 1 This is a top view of the battery electrode welding equipment provided in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the battery electrode welding equipment provided in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the first electrode pressure head assembly provided in an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the second electrode pressure head assembly provided in an embodiment of the present invention.

[0025] Figure 5 This is a partial structural schematic diagram of the first electrode pressure head assembly provided in an embodiment of the present invention.

[0026] Figure 6 This is a partial structural schematic diagram of the first electrode pressure head assembly provided in an embodiment of the present invention.

[0027] Figure 7 This is a partial structural schematic diagram of the second electrode pressure head assembly provided in an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the battery positioning fixture provided in an embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram of the battery positioning fixture provided in an embodiment of the present invention.

[0030] In the picture:

[0031] 100 Battery positioning fixture, 101 Fixture base, 102 Fixture column, 103 Fixture cover, 104 Battery mounting cavity, 105 Positioning block, 106 Pressure block.

[0032] 200 First electrode pressure head assembly, 201 First cylinder, 202 First guide rail, 203 First laser pressure plate, 204 First copper nozzle, 205 First channel, 206 First air passage, 207 First air duct, 208 First inlet, 209 First outlet, 210 First protective manifold block, 211 First dust removal manifold block, 212 First gas passage, 213 First purging passage

[0033] 300 Second electrode pressure head assembly, 301 Second cylinder, 302 Second guide rail, 303 Second laser pressure plate, 304 Second copper nozzle, 305 Elastic element, 306 Second channel, 307 Second air duct, 308 Second air duct, 309 Second inlet, 310 Second outlet, 311 Second protective manifold block, 312 Second dust removal manifold block.

[0034] 400 batteries,

[0035] 500 mounting plate. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the workpiece of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] This disclosure provides a battery 400 electrode welding device. Please refer to [link to relevant documentation]. Figures 1-9The battery 400 electrode welding equipment includes a mounting plate 500, a battery positioning fixture 100, a first electrode pressing head assembly 200, a second electrode pressing head assembly 300, and a welding fixture. The battery positioning fixture 100, the first electrode pressing head assembly 200, and the second electrode pressing head assembly 300 are mounted on the mounting plate 500. The battery positioning fixture 100, the first electrode pressing head assembly 200, and the second electrode pressing head assembly 300 work together to define the battery 400 to be welded. The welding fixture can move around the battery positioning fixture 100 to perform welding operations on the battery 400.

[0044] Please see Figure 1 and Figure 2 The battery positioning fixture 100 is used to clamp the battery 400 to be processed, thereby exposing a first side and a second side opposite to the first side of the battery 400. A first electrode pressing head assembly 200 is disposed on one side of the battery positioning fixture 100 and includes a first cylinder 201, a first guide rail 202, a first laser pressing plate 203 slidably disposed on the first guide rail 202, and a plurality of first copper nozzles 204 fixed on the first laser pressing plate 203 and corresponding to the welding area on the first side of the battery 400. The first cylinder 201 is connected to the first laser pressing plate 203 and is used to drive the first laser pressing plate 203 to move on the first guide rail 202 to cause the first copper nozzles 204 to abut against or retract from the welding area on the first side of the battery 400. The second electrode pressing head assembly 300 is located on the other side of the battery positioning fixture 100. It includes a second cylinder 301, a second guide rail 302, a second laser pressing plate 303 slidably mounted on the first guide rail 202, and a plurality of second copper nozzles 304 floating on the second laser pressing plate 303 and corresponding to the welding area on the second side of the battery 400. The second cylinder 301 is connected to the second laser pressing plate 303 and drives the second laser pressing plate 303 to move on the second guide rail 302, causing the second copper nozzles 304 to abut against or retract from the welding area on the second side of the battery 400. The welding fixture includes a robotic arm and a welding galvanometer mounted at the end of the robotic arm. The robotic arm drives the welding galvanometer to move between the first electrode pressing head assembly 200 and the second electrode pressing head assembly 300, so as to perform welding on the welding area on the battery 400 through the first copper nozzles 204 and the second nozzles.

[0045] In one possible implementation, such as Figure 8 and Figure 9As shown, the battery positioning fixture 100 includes a fixture base 101, fixture columns 102 supported at both ends of the fixture base 101, and a fixture cover plate 103 covering the fixture columns 102. The fixture cover plate 103, the fixture columns 102, and the fixture base 101 together form a battery mounting cavity 104 for accommodating the battery 400.

[0046] Please continue reading Figure 8 The upper end face of the tooling base 101 is provided with a positioning block 105 protruding into the battery mounting cavity 104. The positioning block 105 is embedded in the bottom surface of the battery 400 to restrict the battery 400 from sliding axially. The lower end face of the tooling cover plate 103 is provided with a pressing block 106 protruding into the battery mounting cavity 104. The pressing block 106 abuts against the top surface of the battery 400 to restrict the battery 400 from moving radially.

[0047] In one possible implementation, please see Figure 5 and Figure 6 The first copper nozzle 204 is provided with a first channel 205, a first air duct 206, and a first ventilation duct 207. The first channel 205 extends through two opposite sides of the first copper nozzle 204. The first outlet 209 of the first channel 205 faces the first side of the battery 400, and the first inlet 208 of the first channel 205 is used to receive the laser beam from the welding galvanometer and allow the laser beam to pass through the first channel 205 to reach the area to be welded on the first side of the battery 400. The first air duct 206 extends downward from the upper end of the first copper nozzle 204 to communicate with the first channel 205. The first ventilation duct 207 extends upward from the lower end of the first copper nozzle 204 to communicate with the first channel 205.

[0048] Optional, such as Figure 5 As shown, the inner diameter of the first copper nozzle 204 decreases from the first inlet 208 to the first outlet 209. The first air passage 206 is inclined from the upper end of the first copper nozzle 204 towards the first outlet 209 of the first channel 205, so that the protective gas delivered by the first air passage 206 can reach the first outlet 209. The connection between the first air passage 206 and the first channel 205 is closer to the first outlet 209 than the connection between the first air duct 207 and the first channel 205.

[0049] Furthermore, the first electrode pressure head assembly 200 also includes a first protective manifold block 210 and a first dust removal manifold block 211. The first protective manifold block 210 has a first gas channel 212, which connects to the first air passage 206 and the gas supply device. The first dust removal manifold block 211 has a first purging channel 213, which connects to the first air passage 207 and the dust removal device. After the gas supply device is started, it can deliver protective gas to the first channel 205. After the dust removal device is started, it will generate negative pressure in the first channel 205 to discharge impurities generated in the first channel 205 during the welding process.

[0050] In one possible implementation, please see Figure 7 Each of the second copper nozzles 304 is connected to the second laser pressure plate 303 via an elastic element 305. During the process where the second cylinder 301 drives the second copper nozzle 304 to abut against the second side of the battery 400, the elastic element 305 is compressed and deformed by the squeezing force of the second copper nozzle 304. The elastic element 305 can be a spring or a sheet spring.

[0051] In one possible implementation, the second copper nozzle 304 includes a second channel 306, a second air duct 307, and a second air duct 308. The second channel 306 extends through two opposite sides of the second copper nozzle 304. The second outlet 310 of the second channel 306 faces the second side of the battery 400, and the second inlet 309 of the second channel 306 is used to receive the laser beam from the welding galvanometer and allow the laser beam to pass through the second channel 306 to reach the area to be welded on the second side of the battery 400. The second air duct 307 extends downward from the upper end face of the second copper nozzle 304 to communicate with the second channel 306, and the second air duct 308 extends upward from the lower end face of the second copper nozzle 304 to communicate with the second channel 306.

[0052] Optionally, the inner diameter of the second copper nozzle 304 decreases from the second inlet 309 to the second outlet 310. The second air passage 307 is inclined from the upper end of the second copper nozzle 304 towards the second outlet 310 of the second channel 306, so that the protective gas delivered by the second air passage 307 can reach the second outlet 310. The connection between the second air passage 307 and the second channel 306 is closer to the second outlet 310 than the connection between the second air passage 308 and the second channel 306. The structure of the second copper nozzle 304 is the same as that of the first copper nozzle 204, which can improve the matching degree between the copper nozzle and the welding galvanometer.

[0053] Furthermore, the second electrode pressure head assembly 300 also includes a second protective manifold block 311 and a second dust removal manifold block 312. The second protective manifold block 311 has a second gas channel, which connects the second air passage 307 to the gas supply device. The second dust removal manifold block 312 has a second purging channel, which connects the second air passage 308 to the dust removal device. After the gas supply device is started, it can deliver protective gas to the second channel 306. After the dust removal device is started, it will generate negative pressure in the second channel 306 to discharge impurities generated in the second channel 306 during the welding process.

[0054] The steps for welding the battery 400 using the battery 400 electrode welding equipment provided in this embodiment are as follows:

[0055] 1. Place the battery 400 into the battery mounting cavity 104 of the battery positioning fixture 100, so that the positioning block 105 and the pressure block 106 abut against the upper and lower end faces of the battery 400 to center and position the motor.

[0056] 2. The first cylinder 201 drives the first laser pressure plate 203 to approach the first side of the battery 400 until the first outlet 209 of the first copper nozzle 204 abuts against the battery 400 electrode and squeezes the battery 400 electrode to fit against the battery 400 terminal post. The second cylinder 301 drives the second laser pressure plate 303 to approach the second side of the battery 400 until the second outlet 310 of the second copper nozzle 304 abuts against the battery 400 electrode and squeezes the battery 400 electrode to fit against the battery 400 terminal post.

[0057] 3. The robotic arm moves, carrying a welding galvanometer to perform welding operations on the battery 400 electrodes. When welding the first side of the battery 400, the laser emitted by the welding galvanometer passes through the first channel 205 of the first copper nozzle 204 to weld the battery 400. During the welding process, the gas supply device and dust removal device are simultaneously activated. Protective gas is supplied to the first channel 205 through the first air passage 206, and impurities generated in the first channel 205 are removed through the first air duct 207. When welding the second side of the battery 400, the laser emitted by the welding galvanometer passes through the second channel 306 of the second copper nozzle 304 to weld the battery 400. During the welding process, the gas supply device and dust removal device are simultaneously activated. Protective gas is supplied to the second channel 306 through the second air passage 307, and impurities generated in the second channel 306 are removed through the second air duct 308.

[0058] In this embodiment, a battery positioning fixture 100 is used to position the battery 400 to be welded. A first electrode pressing head assembly 200 and a second electrode pressing head assembly 300 are respectively set on both sides of the battery 400 to be welded. The first electrode pressing head assembly 200 and the second electrode pressing head assembly 300 are used to abut against the battery 400 so that the electrodes on the battery 400 contact the battery 400 terminals. Then, a robotic arm is used to drive the welding galvanometer to perform laser welding on the area to be welded on the battery 400. This disclosure realizes the automation of laser welding, saves labor costs, and when welding multiple sides of the battery 400, it is not necessary to flip the battery 400 and repeat the positioning operation, which can improve welding efficiency. Laser welding is performed through the first copper nozzle 204 and the second copper nozzle 304, which has accurate positioning, beautiful weld joints, and small heat-affected zone of the welded part.

[0059] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A battery electrode welding device, characterized in that, include: A battery positioning fixture is used to clamp the battery to be processed, so as to expose a first side of the battery and a second side opposite to the first side; The first electrode pressing head assembly is located on one side of the battery positioning fixture, including a first cylinder, a first guide rail, a first laser pressing plate slidably disposed on the first guide rail, and a plurality of first copper nozzles fixed on the first laser pressing plate and corresponding to the welding area on the first side of the battery. The first cylinder is connected to the first laser pressing plate and is used to drive the first laser pressing plate to move on the first guide rail so as to drive the first copper nozzles to abut against or retract from the welding area on the first side of the battery. The second electrode pressing head assembly is located on the other side of the battery positioning fixture. It includes a second cylinder, a second guide rail, a second laser pressing plate slidably disposed on the second guide rail, and a plurality of second copper nozzles floating on the second laser pressing plate and corresponding to the area to be welded on the second side of the battery. The second cylinder is connected to the second laser pressing plate and is used to drive the second laser pressing plate to move on the second guide rail so that the second copper nozzles abut against or retract from the area to be welded on the second side of the battery. The welding fixture includes a robotic arm and a welding galvanometer mounted at the end of the robotic arm. The robotic arm drives the welding galvanometer to move between the first electrode pressing head assembly and the second electrode pressing head assembly to perform welding on the area to be welded on the battery through the first copper nozzle and the second cylindrical nozzle.

2. The device according to claim 1, characterized in that, The battery positioning fixture includes a fixture base, fixture columns supported at both ends of the fixture base, and a fixture cover plate covering the fixture columns. The fixture cover plate, the fixture columns, and the fixture base together form a battery mounting cavity for accommodating the battery.

3. The device according to claim 2, characterized in that, The upper end face of the tooling base is provided with a positioning block protruding into the battery mounting cavity. The positioning block is embedded in the bottom surface of the battery to restrict the battery from sliding axially. The lower end face of the tooling cover is provided with a pressing block protruding into the battery mounting cavity. The pressing block abuts against the top surface of the battery to restrict the battery from moving radially.

4. The device according to claim 1, characterized in that, The first copper nozzle is provided with a first channel, a first air passage, and a first air duct. The first channel runs through two opposite sides of the first copper nozzle. The first outlet of the first channel is directly opposite the first side of the battery. The first inlet of the first channel is used to receive the laser beam from the welding galvanometer and allow the laser beam to pass through the first channel to reach the area to be welded on the first side of the battery. The first air passage extends downward from the upper end of the first copper nozzle to communicate with the first channel. The first air duct extends upward from the lower end of the first copper nozzle to communicate with the first channel.

5. The device according to claim 4, characterized in that, The inner diameter of the first copper nozzle decreases from the first inlet to the first outlet; the first air passage is inclined from the upper end of the first copper nozzle toward the first outlet of the first passage, so that the protective gas delivered by the first air passage can reach the first outlet. The connection point between the first air duct and the first channel is closer to the first outlet than the connection point between the first air duct and the first channel.

6. The device according to claim 4, characterized in that, The first electrode pressure head assembly also includes a first protection manifold block and a first dust removal manifold block. The first protection manifold block is provided with a first gas channel, which connects the first air duct to the gas supply device. The first dust removal manifold block is provided with a first purging channel, which connects the first air duct to the dust removal device.

7. The device according to claim 1, characterized in that, Each of the second copper nozzles is connected to the second laser pressure plate via an elastic element. During the process of the second cylinder driving the second copper nozzle to abut against the second side of the battery, the elastic element is compressed and deformed by the squeezing force of the second copper nozzle.

8. The device according to claim 7, characterized in that, The second copper nozzle is provided with a second channel, a second air duct, and a second air duct. The second channel runs through the two opposite sides of the second copper nozzle. The second outlet of the second channel is directly opposite the second side of the battery. The second inlet of the second channel is used to receive the laser beam from the welding galvanometer and allow the laser beam to pass through the second channel to reach the area to be welded on the second side of the battery. The second air duct extends downward from the upper end of the second copper nozzle to communicate with the second channel. The second air duct extends upward from the lower end of the second copper nozzle to communicate with the second channel.

9. The device according to claim 8, characterized in that, The inner diameter of the second copper nozzle decreases from the second inlet to the second outlet; the second air passage is inclined from the upper end of the second copper nozzle toward the second outlet of the second passage, so that the protective gas delivered by the second air passage can reach the second outlet; The connection point between the second air duct and the second channel is closer to the second outlet than the connection point between the second air duct and the second channel.

10. The device according to claim 8, characterized in that, The second electrode pressure head assembly also includes a second protection manifold block and a second dust removal manifold block. The second protection manifold block is provided with a second gas channel, which connects the second air duct and the gas supply device. The second dust removal manifold block is provided with a second purging channel, which connects the second air duct and the dust removal device.

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