Current collector plate welding jig and current collector plate welding method for secondary battery

Abstract

The application provides a current collecting disc welding clamp and a current collecting disc welding method for a secondary battery. The current collecting disc welding clamp comprises a first welding seat and a second welding seat. The first welding seat comprises a first supporting part, a first base, a first elastic member arranged between the first supporting part and the first base, a first trigger switch and a first welding head. The first elastic member is mounted between the first supporting part and the first base. The first supporting part is provided with a first hole groove. The first welding head is mounted in the first hole groove. The first supporting part and the first base are pressed against each other to compress and deform the first elastic member. The first trigger switch is triggered to act to control the first welding head to start laser welding under the compression and deformation of the first elastic member. The first supporting part of the first welding seat and a second supporting part of the second welding seat can clamp a to-be-welded assembly from both sides, and the current collecting disc and the battery roll core of the to-be-welded assembly are welded together. The application can realize rapid welding and has a high yield.

Description

Technical Field

[0001] This invention relates to secondary batteries, and more particularly to the welding of current collectors in secondary batteries and the winding core in multi-tab batteries. Background Technology

[0002] Currently, tabless batteries are favored by the market for their advantages such as low internal resistance, low heat generation, uniform current distribution on the electrodes, and higher core roundness. Traditional tabbed batteries use metal strips welded to the current collector to concentrate the current and lead it to the battery's steel casing. Tabless batteries (also known as multi-tab batteries) abandon the metal strip, leaving blank spaces on both sides of the current collector's width as paths for current extraction. In tabless batteries, the core is flattened or die-cut and then pressed into tab layers. These tab layers are then welded to the positive and negative current collectors, and finally, the current collectors are welded to the casing and cover. Welding the current collectors to the tab layers is a crucial step in the manufacturing process of tabless batteries. Current methods involve fixing the current collectors to the core tab layers using clamps and then welding them together using laser welding. This method cannot achieve a tight fit between the current collectors and the core tab layers, resulting in a high welding defect rate. Furthermore, it requires accurate alignment of the current collectors and the core tab layers, and the positive and negative terminals need to be welded separately, leading to low efficiency.

[0003] Therefore, there is an urgent need for a welding method for manifolds that can solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a welding fixture and welding method for the current collector of a secondary battery, which can achieve rapid welding and a high welding yield.

[0005] To achieve the above objectives, the present invention provides a current collector welding fixture for a secondary battery, used to position and weld the tab layer and current collector of a battery core in a component to be welded together. The fixture includes a first welding seat and a second welding seat. The first welding seat includes a first support portion, a first base portion, a first elastic element disposed between the first support portion and the first base portion, a first trigger switch, and a first welding head. The first elastic element is installed between the first support portion and the first base portion. The first support portion has a first slot, in which the first welding head is installed. The relative compression of the first support portion and the first base portion causes the first elastic element to compress and deform. The first trigger switch is activated by the compression deformation of the first elastic element, and the activation of the first trigger switch controls the first welding head to begin laser welding. The second welding seat includes a second support portion. The first support portion of the first welding seat and the second support portion of the second welding seat can clamp the component to be welded from opposite sides, and the first welding head welds the tab layer and current collector of the battery core together when the first elastic element is compressed and deformed.

[0006] Preferably, the first trigger switch is installed at the end of the first elastic member and is triggered when the contact force of the first elastic member is greater than a preset value; or, the first trigger switch is installed on the first elastic member and is triggered when the compression deformation of the first elastic member is greater than a preset value.

[0007] Preferably, the second welding seat further includes a second base, a second elastic element disposed between the second support portion and the second base, a second trigger switch, and a second welding head. The second elastic element is installed between the second support portion and the second base. The second support portion has a second slot, and the second welding head is installed in the second slot. The relative compression of the second support portion and the second base can cause the second elastic element to compress and deform. The second trigger switch is triggered by the compression and deformation of the second elastic element, and the triggering action of the second trigger switch controls the second welding head to start laser welding. The first support portion of the first welding seat and the second support portion of the second welding seat can clamp the component to be welded from both sides, and when the first elastic element and the second elastic element are compressed and deformed, the electrode layers on both sides of the battery core and the two current collectors are welded together by the first welding head and the second welding head respectively. This solution allows the current collectors to be welded to both sides of the battery core simultaneously, further improving welding efficiency.

[0008] Specifically, the second trigger switch is installed at the end of the second elastic member and is triggered when the contact force of the second elastic member is greater than a preset value; or, the second trigger switch is installed on the second elastic member and is triggered when the compression deformation of the second elastic member is greater than a preset value.

[0009] Specifically, the battery core and current collector of the component to be welded have a central hole. The current collector welding fixture also includes a positioning rod that can pass through the central hole of the component to be welded. The second support, the first support, and the first base have positioning through holes that match the positioning rod and allow the positioning rod to pass through. The positioning rod ensures accurate alignment of the battery core and current collector, prevents misalignment between the current collector and the core, and makes the direction of force controllable when the first welding seat and the second welding seat are pressed against each other.

[0010] More specifically, the plurality of first slots are through holes arranged around the center of the first support portion, the plurality of second slots are through holes arranged around the center of the second support portion, the first welding head is mounted on the first base portion, and the second welding head is mounted on the second base portion.

[0011] Preferably, the first slot is a through hole disposed around the center of the first support portion, and the first welding head is mounted on the first base portion.

[0012] Preferably, the battery core and current collector of the component to be welded have a central hole. The current collector welding fixture further includes a positioning rod that can pass through the central hole of the component to be welded. The first welding seat has a positioning through hole that matches the positioning rod and allows the positioning rod to pass through. One end of the positioning rod is mounted on the second welding seat, and the other end of the positioning rod can pass through the central hole of the component to be welded and the positioning through hole of the first welding seat in sequence. The positioning rod ensures high alignment accuracy between the battery core and the current collector, and allows for controllable force direction when the first welding seat and the second welding seat are pressed against each other, preventing loose adhesion between the current collector and the tab layer or loose adhesion in some areas due to current collector deflection.

[0013] The present invention also provides a current collector welding method, which uses the current collector welding fixture described above to perform current collector welding, comprising the following steps: providing a component to be welded, the component to be welded including a battery core and a first current collector; assembling the component to be welded together and clamping it between a first support portion of a first welding seat and a second support portion of a second welding seat, with one side of the first current collector contacting a first side of the battery core, and the first support portion abutting against the other side of the first current collector; pressing the first base of the first welding seat relative to the second welding seat, the component to be welded is pressed between the first support portion and the second support portion, the first elastic element is compressed and deformed to trigger the first trigger switch to control the first welding head to start laser welding, and the first welding head passes through the first slot to weld the first current collector onto the tab layer on the first side of the battery core.

[0014] Preferably, in the manifold welding fixture, the second welding seat further includes a second base, a second elastic element disposed between the second support and the second base, a second trigger switch, and a second welding head. The second elastic element is installed between the second support and the second base. The second support has a second slot, in which the second welding head is installed. The relative compression of the second support and the second base causes the second elastic element to compress and deform. The second trigger switch is triggered by the compression and deformation of the second elastic element, and the trigger switch controls the second welding head to begin laser welding. The component to be welded also includes a second manifold. The components to be welded are assembled together and clamped in the first support and the second base of the first welding seat. When the second support portion of the two welding seats is between each other, one side of the second current collector also contacts the second side of the battery core, and the second support portion also abuts against the other side of the second current collector; when the first base of the first welding seat is pressed relative to the second welding seat, the component to be welded is pressed between the first support portion and the second support portion, so that the first elastic element and the second elastic element are simultaneously compressed and deformed, and the first trigger switch and the second trigger switch are simultaneously triggered to control the first welding head and the second welding head to start laser welding. The first welding head passes through the first hole groove to weld the first current collector onto the tab layer on the first side of the battery core, and the second welding head passes through the second hole groove to weld the second current collector onto the tab layer on the second side of the battery core.

[0015] Compared with the prior art, the present invention includes a first welding base and a second welding base in an upper and lower set. The first welding base includes a trigger switch (first trigger switch and second trigger switch) that is excited by the deformation of elastic elements (first elastic element and second elastic element). The first welding base and the second welding base tightly clamp the collector plate and the core from both sides and compress the elastic elements under force. The extrusion pressure is stable. During extrusion, the trigger switch is triggered to open the welding head (first welding head and second welding head) to weld the collector plate, thereby improving welding efficiency and reducing welding defect rate. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the first welding seat of the present invention at one angle.

[0017] Figure 2 This is a structural diagram of the first welding seat of the present invention from another angle.

[0018] Figure 3 This is a structural diagram of the second welding seat of the present invention.

[0019] Figure 4 This is a structural diagram of the component to be welded.

[0020] Figure 5This is a structural diagram of the welding assembly receiving the welding components in Embodiment 1 of the present invention.

[0021] Figure 6 This is a structural diagram of the welding assembly receiving the welding components in Embodiment 2 of the present invention. Detailed Implementation

[0022] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] Example 1: refer to Figure 5 This invention provides a welding fixture for current collectors of a secondary battery, used to position and weld the tab layer of the battery core 41 and the first current collector 42 and second current collector 43 together in an assembly to be welded, including a first welding seat 10 and a second welding seat 20. The first welding seat 10 and the second welding seat 20 can clamp the assembly to be welded together from two opposite sides. (See reference...) Figure 4 The two current collectors are a first current collector 42 welded to one side of the battery core 41 and a second current collector 43 welded to the other side of the battery core 41. The battery core 41 of this invention is a full-tab battery core.

[0024] refer to Figure 1 and Figure 2 The first welding base 10 includes a first support portion 12, a first base portion 11, a first elastic element 13 disposed between the first support portion 12 and the first base portion 11, a first trigger switch, and a first welding head 14. The first support portion 12 has a first support platform on one side. The first elastic element 13 provides elastic force to the first support portion 12 away from the first base portion 11. The platform of the first support platform has a first through hole 123. The first welding head 14 is installed in the first through hole 123. The first trigger switch controls the first welding head 14 to start laser welding when the first support portion 12 and the first base portion 11 are pressed against each other to compress and deform the first elastic element 13.

[0025] In this embodiment, the first welding head 14 is mounted on the first base 11. Of course, the first welding head 14 can also be directly mounted on the first support 12. In this case, the first through hole 123 can be replaced by a non-through groove, or it can still be a through hole.

[0026] refer to Figure 1 and Figure 2 The first trigger switch is installed at the end of the first elastic member 13 and controls the first welding head 14 to start laser welding when the contact pressure of the first elastic member 13 is greater than a preset value or the compression deformation of the second elastic member 23 exceeds a preset range.

[0027] The first support portion 12 has a plurality of first mounting posts 121 protruding on the side facing the first base portion 11, and the first base portion 11 has a first mounting portion 111 protruding on the side facing the first support portion 12, which is opposite to the position of the first mounting posts 121. The first elastic member 13 is abutted and installed between the first mounting posts 121 and the first mounting portion 111.

[0028] refer to Figure 3 The second welding base 20 includes a second support portion 22, and a second support platform is provided on one side of the second support portion 22. Specifically, the second welding base 20 also includes a second base 21, a second elastic member 23 disposed between the second support portion 22 and the second base 21, a second trigger switch, and a second welding head 24. The second elastic member 23 provides elastic force to the second support portion 22 away from the second base 21. The platform surface of the second support platform has a second through hole 223, and the second welding head 24 is installed in the second through hole 223. The second trigger switch controls the second welding head 24 to start laser welding when the second support portion 22 and the second base 21 are pressed against each other to compress and deform the second elastic member 23.

[0029] In this embodiment, the second welding head 24 is mounted on the second base 21. Of course, the second welding head 24 can also be directly mounted on the second support 22. In this case, the second through hole 223 can be replaced by a non-through groove or it can still be a through hole.

[0030] Among them, reference Figure 3 The second trigger switch is installed at the end of the second elastic member 23 and controls the second welding head 24 to start laser welding when the contact pressure of the second elastic member 23 is greater than a preset value or the compression deformation of the second elastic member 23 exceeds a preset range.

[0031] The second support portion 22 has a plurality of second mounting posts 221 protruding on the side facing the second base portion 21, and the second base portion 21 has a second mounting portion 211 protruding on the side facing the second support portion 22, which is opposite to the position of the second mounting posts 221. The second elastic member 23 is abutted and installed between the second mounting posts 221 and the second mounting portion 211.

[0032] refer to Figure 3 and Figure 5The manifold welding fixture also includes a positioning rod 30 that can pass through the central hole of the component to be welded. The first support portion 12, the second support portion 22, and the first base portion 11 each have positioning through holes that match the positioning rod 30 and allow the positioning rod 30 to pass through. The positioning through holes include a first positioning through hole 122, a second positioning through hole 222, and a third positioning through hole 112. The first support portion 12 and the second support portion 22 are sheet-like. The first support portion 12 includes the through first positioning through hole 122 and a plurality of first through holes 123 arranged around the first positioning through hole 122. The second support portion 22 includes the through second positioning through hole 222 and a plurality of second through holes 223 arranged around the second positioning through hole 222. The first base portion 11 has a through third positioning through hole 112.

[0033] Specifically, one end of the positioning rod 30 is mounted on the second welding seat 20, and the other end of the positioning rod 30 passes through the second positioning through hole 222 of the second support part 22, the first positioning through hole 122 of the first support part 12, and the third positioning through hole 112 of the first base part 11 in sequence.

[0034] In this embodiment, the first welding seat 10 is slidably connected to the positioning rod 30.

[0035] refer to Figure 5 This describes a method for welding current collectors using a welding fixture for secondary batteries, specifically including: 1. Clamp the component to be welded between the first welding seat 10 and the second welding seat 20. Specifically, this includes the following steps: S11, a positioning rod 30 is mounted on the second base 21 and extends through the second positioning through hole 222, and a second current collector 43 is threaded onto the positioning rod 30 through its central hole 431 to mount the second current collector 43 onto the second welding seat 20. S12, a battery core 41 is threaded onto the positioning rod 30 through its central hole 411 to mount the battery core 41 onto the second welding seat 20, such that the second side of the battery core 41 contacts the second current collector 43. S13, a first current collector 42 is threaded onto the positioning rod 30 through its central hole 411 to mount the first current collector 42 onto the second welding seat 20, such that the first current collector 42 releases the first side of the battery core 41. S14, the first welding seat 10 is threaded onto the positioning rod 30 through its first positioning through hole 122 and third positioning through hole 112, so as to install the first welding seat 10 above the second welding seat 20. The first support platform faces the second welding seat 20 and cooperates with the second support platform to clamp the component to be welded.

[0036] 2. The distance between the first welding seat 10 and the second welding seat 20 is compressed, and the first welding seat 10 slides downward along the positioning rod 30, so that the first elastic element 13 and the second elastic element 23 are compressed and deformed. Specifically, the second welding seat 20 can be fixed to the worktable, and then the first base 11 is pressed downward, so that the distance between the first base 11 and the first support 12 is compressed, and the first elastic element 13 is compressed and deformed; the distance between the second base 21 and the second support 22 is compressed, and the second elastic element 23 is compressed and deformed.

[0037] 3. As the first elastic element 13 and the second elastic element 23 are compressed and deformed, when the amount of compression deformation reaches a preset value or the compression force reaches a preset value, the first trigger switch and the second trigger switch are triggered. The first trigger switch is triggered to control the first welding head 14 to start laser welding, and the first side of the battery core 41 and the first current collector 42 are welded together. At the same time, the second trigger switch is triggered to control the second welding head 24 to start laser welding, and the second side of the battery core 41 and the second current collector 43 are welded together.

[0038] This embodiment can simultaneously weld the battery core 41 and the first current collector 42 and the second current collector 43 on both sides by compressing the distance between the first welding seat 10 and the second welding seat 20, resulting in high welding efficiency.

[0039] Example 2: refer to Figure 6 This invention provides a welding fixture for a current collector of a secondary battery, used for positioning and welding a component to be welded, consisting of a battery core 41 and a first current collector 42, including a first welding seat 10 and a second welding seat 20. The first welding seat 10 and the second welding seat 20 can clamp the component to be welded together from two opposite sides. The battery core 41 of this invention is a multi-tab battery core.

[0040] refer to Figure 1 and Figure 2 The first welding base 10 includes a first support portion 12, a first base portion 11, a first elastic element 13 disposed between the first support portion 12 and the first base portion 11, a first trigger switch, and a first welding head 14. The first support portion 12 has a first support platform on one side. The first elastic element 13 provides elastic force to the first support portion 12 away from the first base portion 11. The platform of the first support platform has a first through hole 123. The first welding head 14 is installed in the first through hole 123. The first trigger switch controls the first welding head 14 to start laser welding when the first support portion 12 and the first base portion 11 are pressed against each other to compress and deform the first elastic element 13.

[0041] refer to Figure 1 and Figure 2 The first trigger switch is installed at the end of the first elastic member 13 and controls the first welding head 14 to start laser welding when the contact pressure of the first elastic member 13 is greater than a preset value or the compression deformation of the second elastic member 23 exceeds a preset range.

[0042] The first support portion 12 has a plurality of first mounting posts 121 protruding on the side facing the first base portion 11, and the first base portion 11 has a first mounting portion 111 protruding on the side facing the first support portion 12, which is opposite to the position of the first mounting posts 121. The first elastic member 13 is abutted and installed between the first mounting posts 121 and the first mounting portion 111.

[0043] refer to Figure 6 The second welding base 20 includes a second support portion 22, and a second support platform is provided on one side of the second support portion 22. Specifically, the second welding base 20 also includes a second base 21 and a second elastic member 23 disposed between the second support portion 22 and the second base 21, the second elastic member 23 providing elastic force to the second support portion 22 away from the second base 21.

[0044] The second support portion 22 has a plurality of second mounting posts 221 protruding on the side facing the second base portion 21, and the second base portion 21 has a second mounting portion 211 protruding on the side facing the second support portion 22, which is opposite to the position of the second mounting posts 221. The second elastic member 23 is abutted and installed between the second mounting posts 221 and the second mounting portion 211.

[0045] refer to Figure 6 The manifold welding fixture also includes a positioning rod 30 that can pass through the central hole of the component to be welded. The first support portion 12, the second support portion 22, and the first base portion 11 each have positioning through holes that match the positioning rod 30 and allow it to pass through. Specifically, one end of the positioning rod 30 is mounted on the second welding seat 20, and the other end of the positioning rod 30 passes sequentially through the positioning through holes of the second support portion 22, the first support portion 12, and the first base portion 11. In a different embodiment, the positioning rod can be mounted on the first base portion 11. In this case, the first support portion 12 and the second welding seat 20 are provided with positioning through holes that match the positioning rod 30 and allow it to pass through.

[0046] refer to Figure 6 This describes a method for welding current collectors using a welding fixture for secondary batteries, specifically including: 1. Clamp the component to be welded between the first welding seat 10 and the second welding seat 20. Specifically, this includes the following steps: S11, a positioning rod 30 is mounted on the second base 21 and extends through the second positioning through hole 222. A battery core 41 is threaded onto the positioning rod 30 through its central hole 411 to mount the battery core 41 onto the second welding seat 20, such that the second side of the battery core 41 contacts the second support portion 22. S13, a first current collector 42 is threaded onto the positioning rod 30 through its central hole 411 to mount the first current collector 42 onto the second welding seat 20, such that the first current collector 42 releases the first side of the battery core 41. S14, the first welding seat 10 is threaded onto the positioning rod 30 through the positioning through hole to mount the first welding seat 10 above the second welding seat 20. A first support platform faces the second welding seat 20 and cooperates with the second support platform to clamp the component to be welded.

[0047] 2. The distance between the first welding seat 10 and the second welding seat 20 is compressed, and the first welding seat 10 slides downward along the positioning rod 30 to compress and deform the first elastic member 13. The second welding seat 20 can be fixed to the worktable, and then the first base 11 is pressed downward, compressing the distance between the first base 11 and the first support 12.

[0048] 3. As the first elastic element 13 is compressed and deformed, when the amount of compression deformation reaches a preset value or the compression force reaches a preset value, the first trigger switch is triggered to control the first welding head 14 to start laser welding, and the first side of the battery core 41 and the first current collector 42 are welded together.

[0049] Unlike Embodiment 1, in this embodiment, the second welding seat 20 does not have a welding head, and only one side of the current collector and battery core is welded at a time. This embodiment can be used for welding the current collector in stages, or for welding the battery core with the current collector located on one side.

[0050] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A welding fixture for a current collector of a secondary battery, used to position and weld the tab layer and current collector of the battery core in the assembly to be welded together, characterized in that: include: The first welding seat includes a first support portion, a first base portion, a first elastic element disposed between the first support portion and the first base portion, a first trigger switch, and a first welding head. The first elastic element is installed between the first support portion and the first base portion. The first support portion has a first slot. The first welding head is installed in the first slot. The first support portion and the first base portion are pressed against each other, which causes the first elastic element to be compressed and deformed. The first trigger switch is triggered by the compression and deformation of the first elastic element. The trigger switch trigger action controls the first welding head to start laser welding. The second welding seat includes a second support portion, a second base portion, a second elastic element disposed between the second support portion and the second base portion, a second trigger switch, and a second welding head. The second elastic element is installed between the second support portion and the second base portion. The second support portion has a second slot, and the second welding head is installed in the second slot. The relative compression of the second support portion and the second base portion can cause the second elastic element to be compressed and deformed. The second trigger switch is triggered by the compression and deformation of the second elastic element, and the trigger action of the second trigger switch controls the second welding head to start laser welding. The first support portion of the first welding seat and the second support portion of the second welding seat can clamp the component to be welded from both sides, and when the first elastic element is compressed and deformed, the electrode layer and the current collector of the battery core are welded together by the first welding head and the second welding head. The battery core and current collector of the component to be welded have a central hole. The current collector welding fixture also includes a positioning rod that can pass through the central hole of the component to be welded. The first welding seat, the second support, the first support, and the first base have positioning through holes that match the positioning rod and allow the positioning rod to pass through. One end of the positioning rod is mounted on the second welding seat, and the other end of the positioning rod can pass through the central hole of the component to be welded and the positioning through hole of the first welding seat in sequence.

2. The manifold welding fixture as described in claim 1, characterized in that: The first trigger switch is installed at the end of the first elastic element and is triggered when the contact force of the first elastic element is greater than a preset value; or, The first trigger switch is installed on the first elastic element and is triggered when the compression deformation of the first elastic element is greater than a preset value.

3. The manifold welding fixture as described in claim 1, characterized in that: The second trigger switch is installed at the end of the second elastic element and is triggered when the contact force of the second elastic element is greater than a preset value; or, The second trigger switch is installed on the second elastic element and is triggered when the compression deformation of the second elastic element exceeds a preset value.

4. The manifold welding fixture as described in claim 1, characterized in that: The plurality of first slots are through holes arranged around the center of the first support portion, and the plurality of second slots are through holes arranged around the center of the second support portion. The first welding head is mounted on the first base portion, and the second welding head is mounted on the second base portion.

5. The manifold welding fixture as described in claim 1, characterized in that: The plurality of first slots are through holes arranged around the center of the first support portion, and the first welding head is mounted on the first base portion.

6. A method for welding a manifold, characterized in that: Welding the manifold using the manifold welding fixture as described in any one of claims 1-5 includes the following steps: A component to be welded is provided, the component to be welded including a battery core and a first current collector; The components to be welded are assembled together and clamped between the first support portion of the first welding seat and the second support portion of the second welding seat, with one side of the first current collector contacting the first side of the battery core and the first support portion abutting the other side of the first current collector. The component to be welded is pressed between the first support and the second support as the second welding seat presses against the first base of the first welding seat. The first elastic element is compressed and deformed to trigger the first trigger switch to control the first welding head to start laser welding. The first welding head passes through the first slot to weld the first current collector onto the tab layer on the first side of the battery core.

7. The manifold welding method as described in claim 6, characterized in that: In the collector welding fixture, the second welding seat further includes a second base, a second elastic element disposed between the second support and the second base, a second trigger switch, and a second welding head. The second elastic element is installed between the second support and the second base. The second support has a second slot, and the second welding head is installed in the second slot. The relative compression of the second support and the second base can cause the second elastic element to be compressed and deformed. The second trigger switch is triggered by the compression and deformation of the second elastic element, and the triggering action of the second trigger switch controls the second welding head to start laser welding. The component to be welded also includes a second manifold; When the components to be welded are assembled together and clamped between the first support portion of the first welding seat and the second support portion of the second welding seat, one side of the second current collector also contacts the second side of the battery core, and the second support portion also abuts against the other side of the second current collector. When the first base of the first welding seat is pressed against the second welding seat, the component to be welded is pressed between the first support and the second support, so that the first elastic element and the second elastic element are simultaneously compressed and deformed. The first trigger switch and the second trigger switch are simultaneously triggered to control the first welding head and the second welding head to start laser welding. The first welding head passes through the first hole and groove to weld the first current collector to the tab layer on the first side of the battery core. The second welding head passes through the second hole and groove to weld the second current collector to the tab layer on the second side of the battery core.

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