A palladium sheet welding device

Abstract

The utility model belongs to the manufacturing field of battery, especially, a kind of palladium sheet welding device is more particularly related to it.The utility model proposes a kind of palladium sheet welding device to improve the welding quality of palladium sheet and battery pack, including upper locating plate and the clamping mechanism for clamping and fixing palladium sheet and battery pack, palladium sheet locating hole is equipped on upper locating plate, front locating piece and / or rear locating piece for limiting the front side and / or rear side of battery pack are installed on upper locating plate by bolt, the front end and / or rear end of upper locating plate is equipped with the long hole corresponding with corresponding locating piece;Left locating piece and / or right locating piece for limiting the left side and / or right side of battery pack are also installed on upper locating plate by bolt, the left end and / or right end of upper locating plate is also equipped with the long hole corresponding with corresponding locating piece;After bolt passes through corresponding long hole, it is threadedly connected with corresponding locating piece.The relative position of upper locating plate and battery pack is positioned by moving locating piece, to ensure that the relative position of palladium sheet and battery pack meets the requirement.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing, and in particular relates to a palladium sheet welding device. Background Technology

[0002] In the process of assembling lithium batteries, palladium sheets need to be welded to connect the batteries in series or in parallel to obtain the battery module.

[0003] In the original technology, multiple palladium sheets were connected into a single unit by positioning connectors to form an integral palladium sheet. The integral palladium sheet was then placed in the corresponding position of the battery pack (the battery module is the battery pack after removing the palladium sheets), and finally laser welding was performed to obtain the battery module.

[0004] Due to limitations in the module stacking process, the length and width of the battery pack will have slight deviations after assembly (the deviations are within the allowable tolerance range). Therefore, depending on the actual situation, it is necessary to move the integral palladium plate to adjust the relative position of the palladium plate and the battery terminal to make the relative position of the palladium plate and the battery terminal meet the design requirements.

[0005] To eliminate the positioning connector, reduce the module's weight, and increase its mass energy density, Chinese invention patent application CN113118623A, published on July 16, 2021, discloses an aluminum-palladium welding device. The device includes an upper positioning plate (equivalent to an upper positioning plate) and a clamping mechanism. The upper positioning plate has an upper positioning groove whose shape matches the upper end of the battery pack. It also has palladium sheet fixing holes (equivalent to palladium sheet positioning holes). The clamping mechanism includes a bracket, a pressure head connected to the bracket, a lower limiting plate, and a lifting cylinder for driving the lower limiting plate to rise and fall. The pressure head and lower limiting plate clamp and fix the battery pack and palladium sheet under the action of the lifting cylinder (at this time, the pressure head presses the palladium sheet). The pressure head has a laser guiding channel, through which the laser reaches the palladium sheet to achieve laser welding of the palladium sheet and battery terminals, thereby obtaining the battery module.

[0006] During use, the upper end of the battery pack is located in the upper limit slot, thereby limiting the relative position of the battery pack and the upper limit plate. At the same time, since the palladium plate fixing hole is located on the upper limit plate, the relative position of the battery pack and the palladium plate fixing hole can be limited, that is, the relative position of the battery terminal and the palladium plate can be limited.

[0007] Theoretically, the aforementioned aluminum-palladium welding equipment can effectively limit the relative position of the battery terminals and palladium plates; however, in practical production, due to slight deviations in the length and width of the assembled battery pack, if the upper positioning slot corresponds to a battery module of medium size after the upper positioning plate structure is determined, the following two unsuitable situations exist: Scenario 1: The battery pack is too large to fit into the upper positioning slot, making it impossible to use aluminum-palladium welding equipment to weld the palladium sheets. Scenario 2: The battery pack is too small, and there is a gap between the battery pack and the wall of the corresponding limiting groove, which makes it impossible to accurately position the relative position of the battery pack and the upper limit plate, and thus it is impossible to accurately position the relative position of the palladium sheet and the battery terminal of the battery module.

[0008] If the upper limit slot corresponds to the largest battery pack, then the unsuitable situation described in scenario two above exists. Utility Model Content

[0009] The purpose of this invention is to provide a palladium sheet welding device to solve the technical problem that existing aluminum-palladium welding equipment cannot accurately position the relative position of the palladium sheet and the battery terminal.

[0010] To achieve the above objectives, the technical solution of the palladium sheet welding device provided by this utility model is as follows: A palladium sheet welding device includes an upper positioning plate and a clamping mechanism for clamping and fixing palladium sheets and a battery pack. The upper positioning plate is provided with palladium sheet positioning holes. A front positioning member and / or a rear positioning member for limiting the front and / or rear sides of the battery pack are installed on the upper positioning plate by bolts. The front end and / or rear end of the upper positioning plate are provided with elongated holes that extend in the front-rear direction and correspond to the corresponding positioning members. The upper positioning plate is also bolted with left and / or right positioning parts for limiting the left and / or right sides of the battery pack. The left and / or right ends of the upper positioning plate are also provided with elongated holes that extend in the left and right directions and correspond to the corresponding positioning parts. After the bolt passes through the corresponding elongated hole, it is threaded into the corresponding positioning part.

[0011] Furthermore, the lower right corner of the left positioning member and the lower left corner of the right positioning member are provided with guide ramps to provide guidance for the battery pack, forming a flared structure.

[0012] Furthermore, both the lower rear corner of the front positioning member and the lower front corner of the rear positioning member are provided with guide ramps to provide guidance for the battery pack, forming a flared structure.

[0013] Furthermore, the upper positioning plate is also provided with a separation hole for tools and / or human hands to reach in so as to separate the palladium plate from the upper positioning plate, and the separation hole is connected to the palladium plate positioning hole.

[0014] Furthermore, the connection between the separation hole and the palladium plate positioning hole is located in the middle of the palladium plate positioning hole.

[0015] Furthermore, the clamping mechanism includes a support base, a pressure plate, and a locking mechanism for locking the support base and the pressure plate. The pressure plate is equipped with a pressure head for pressing the palladium sheet after being locked by the locking mechanism. The pressure head has a laser channel for allowing laser light to pass through.

[0016] Furthermore, the pressure head includes a pressure cylinder that slides and guides the pressure plate in the vertical direction and a baffle connected to the outer circumferential surface of the pressure cylinder. A compression spring is provided between the baffle and the pressure plate to apply a downward elastic force to the pressure head. The pressure cylinder is made of a heat-conducting material.

[0017] Furthermore, a vertical plate is fixedly connected to the support base, and a latch for locking the support base and the pressure plate is installed on the vertical plate. The pressure plate is provided with a latch groove that matches the latch, and the latch constitutes the locking mechanism.

[0018] Furthermore, a vertical plate is connected to the support base, and a positioning pin and a positioning hole are respectively provided at the top of the vertical plate and the bottom of the pressure plate. The positioning pin and the positioning hole are arranged asymmetrically to avoid the pressure plate being installed backwards.

[0019] Furthermore, the support base is provided with a limiting groove for positioning the front and rear positions of the battery pack, the limiting groove extends to the left and right, and the left or right end of the support base is provided with a side positioning plate for positioning the left and right positions of the battery pack.

[0020] The beneficial effects of the palladium sheet welding device provided by this utility model are as follows: This utility model is an improved invention. The main difference between this utility model and the prior art is that the prior art uses a limiting groove with a fixed size to limit the battery pack, which cannot accurately position the relative position of the battery terminal and the palladium sheet when there is an error in the size of the battery pack; while in this utility model, a left positioning part and / or a right positioning part that can move left and right are provided, and a front positioning part and / or a rear positioning part that can move back and forth are provided to adapt to battery packs with different left and right lengths and different front and back widths.

[0021] During use, the palladium sheet is installed in the palladium sheet positioning hole. The corresponding positioning parts are moved to make them fit tightly against the corresponding side of the battery pack. The left positioning part and / or the right positioning part are used to position the battery pack terminals and the palladium sheet in a left-right relative position. The front positioning part and / or the rear positioning part are used to position the battery pack terminals and the palladium sheet in a front-back relative position to ensure that the relative position of the palladium sheet and the battery terminals meets the design requirements and improves the welding quality. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure after the palladium sheet welding device fixes the palladium sheet and the battery pack; Figure 2 This is a schematic diagram of the palladium sheet welding device; Figure 3 for Figure 2 A structural schematic diagram of the intermediate pressure plate from one perspective; Figure 4 for Figure 2 Another structural diagram of the intermediate pressure plate; Figure 5 for Figure 4 A schematic diagram of the intermediate pressure head, compression spring, and sliding pin; Figure 6 for Figure 2 A structural schematic diagram of the positioning mechanism from one perspective; Figure 7 for Figure 6 A schematic diagram of the front positioning component.

[0023] Explanation of reference numerals in the attached figures: 1. Pressure plate; 1-1. Guide hole; 1-2. Buckle groove; 1-3. Pin hole; 1-4. Positioning hole; 1-5. Pressure cylinder; 1-6. Guide pin; 1-7. Compression spring; 1-8. Baffle; 2. Support base; 3. Vertical plate; 4. Buckle; 5. Positioning mechanism; 5-1. Front and rear elongated holes; 5-2. Left and right elongated holes; 5-3. Front positioning component; 5-4. Rear positioning component; 5-5. Left positioning component; 5-6. Right positioning component; 5-7. Separation hole; 5-8. Palladium plate positioning hole; 5-9. Upper positioning plate; 5-10. Guide slope; 6. Side positioning plate; 7. Battery pack. Detailed Implementation

[0024] To address the problems in the background technology, the core inventive concept of this utility model is as follows: at least one positioning component that can move in the left-right direction and at least one positioning component that can move in the front-back direction are provided on the upper positioning plate. The relative position (including the left-right relative position and the front-back relative position) of the battery pack in contact with the positioning component is adjusted by adjusting the position of the positioning component. This adjusts the relative position of the upper positioning plate and the battery pack, thereby adjusting the relative position of the palladium sheet and the battery terminal and improving the welding quality.

[0025] The present invention will be further described in detail below with reference to embodiments of the palladium sheet welding device.

[0026] like Figures 1-6 As shown, in a first basic embodiment, the palladium sheet welding device includes an upper positioning plate 5-9 and a clamping mechanism for clamping and fixing the palladium sheet and the battery pack 7. The upper positioning plate 5-9 is provided with a palladium sheet positioning hole 5-8, and the clamping mechanism has a laser channel for laser to pass through, which corresponds to the palladium sheet positioning hole 5-8.

[0027] The upper positioning plate 5-9 is bolted with a front positioning member 5-3 and a rear positioning member 5-4 for limiting the front and rear sides of the battery pack 7. The front and rear ends of the upper positioning plate 5-9 are provided with front and rear elongated holes 5-1 extending in the front-rear direction and corresponding to the corresponding positioning members. The upper positioning plate 5-9 is also bolted with a left positioning member 5-5 and a right positioning member 5-6 for limiting the left and right sides of the battery pack 7. The left and right ends of the upper positioning plate 5-9 are also provided with left and right elongated holes 5-2 extending in the left-right direction and corresponding to the corresponding positioning members. After the bolt passes through the corresponding elongated hole, it is threaded to the corresponding positioning member. Therefore, the bolt can be loosened to move the corresponding positioning member along the corresponding elongated hole, and the bolt can be tightened after the corresponding positioning member is in place to fix the position of the corresponding positioning member.

[0028] Each positioning component can be a positioning block, positioning plate, or positioning cylinder, etc.; each positioning component, the upper positioning plate, and the corresponding bolts together constitute the positioning mechanism 5.

[0029] In use, by adjusting the distance between the left positioning member 5-5 and the right positioning member 5-6, battery packs 7 with different left and right lengths can be accommodated. By moving the left positioning member 5-5 and the right positioning member 5-6 at the same time, the left and right relative positions of the battery pack 7 held by the left positioning member 5-5 and the right positioning member 5-6 and the upper positioning plate 5-9 can be adjusted, thereby adjusting the left and right relative positions of the palladium plate in the palladium plate positioning hole 5-8 and the battery terminal of the battery pack 7, ensuring that the left and right relative positions of the palladium plate and the battery terminal meet the design requirements.

[0030] Similarly, by adjusting the distance between the front positioning member 5-3 and the rear positioning member 5-4, battery packs 7 with different front and rear widths can be accommodated. By moving the front positioning member 5-3 and the rear positioning member 5-4 simultaneously, the front and rear relative positions of the battery pack 7 held by the front positioning member 5-3 and the rear positioning member 5-4 and the upper positioning plate 5-9 can be adjusted, thereby adjusting the front and rear relative positions of the palladium sheet in the palladium sheet positioning hole 5-8 and the battery terminal of the battery pack 7, ensuring that the front and rear relative positions of the palladium sheet and the battery terminal meet the design requirements and improving the welding quality.

[0031] As a second basic embodiment, the difference between it and the first basic embodiment is only that: in the second basic embodiment, for the left positioning member 5-5 and the right positioning member 5-6, only the left positioning member 5-5 (or only the right positioning member 5-6) is included. By moving the left (right) positioning member and making the left (right) side of the battery pack 7 contact the left (right) positioning member, the left and right relative positions of the battery pack 7 and the upper positioning plate 5-9 can also be positioned.

[0032] As a third basic embodiment, the difference between it and the first basic embodiment is only that: in the third basic embodiment, for the front positioning member 5-3 and the rear positioning member 5-4, only the front positioning member 5-3 (or only the rear positioning member 5-4) is included. By moving the front (rear) positioning member and making the front (rear) side of the battery pack 7 contact the front (rear) positioning member, the front-rear relative position of the battery pack 7 and the upper positioning plate 5-9 can also be positioned.

[0033] As a fourth basic embodiment, it differs from the first basic embodiment only in that: in the fourth basic embodiment, only one of the left positioning member 5-5 and the right positioning member 5-6 is included, and only one of the front positioning member 5-3 and the rear positioning member 5-4 is included.

[0034] The left positioning member 5-5 and the right positioning member 5-6 form one group, and the front positioning member 5-3 and the rear positioning member 5-4 form another group. In the first to third basic embodiments, at least one set of positioning members can clamp the battery pack 7 to fix the battery pack 7 and the upper positioning plate 5-9 together for easy use.

[0035] In the fourth basic embodiment, after the upper positioning plate 5-9 is in place, the clamping mechanism clamps the palladium sheet and the battery pack 7, the palladium sheet is fixed, and the palladium sheet cooperates with the palladium sheet positioning hole 5-8 stop to restrict the movement of the upper positioning plate 5-9.

[0036] Based on the above basic embodiments, such as Figures 6-7 As shown, in a preferred embodiment, when there is at least one set of positioning members, guide slopes 5-10 can be provided on the positioning members in the same set to form a flared structure (or trumpet structure), which facilitates the installation of the positioning mechanism 5 on the battery pack 7 from top to bottom.

[0037] For example, such as Figures 6-7 As shown, the lower right corner of the left positioning member 5-5 and the lower left corner of the right positioning member 5-6 are provided with guide slopes 5-10 for guiding the battery pack 7, and the lower rear corner of the front positioning member 5-3 and the lower front corner of the rear positioning member 5-4 are provided with guide slopes 5-10 for guiding the battery pack 7.

[0038] After the upper positioning plate 5-9 and battery pack 7 are positioned, the palladium sheet needs to be installed in the palladium sheet positioning hole 5-8. During the installation process, the palladium sheet may be installed at an angle or the palladium sheet may not match the palladium sheet positioning hole 5-8 (the palladium sheet size is not up to standard). In this case, the palladium sheet needs to be removed from the palladium sheet positioning hole 5-8 and reinstalled.

[0039] In the above embodiment, the upper positioning plate 5-9 needs to be removed to easily take out the palladium sheet, which affects production efficiency.

[0040] To facilitate the removal of the palladium sheet, as a preferred embodiment, such as Figure 6 As shown, the upper positioning plate 5-9 is also provided with a separation hole 5-7 for tools (such as a flathead screwdriver) and / or a hand to be inserted to separate the palladium sheet from the upper positioning plate 5-9. The separation hole 5-7 communicates with the palladium sheet positioning hole 5-8. By inserting a tool or finger into the separation hole 5-7, the corresponding palladium sheet can be easily removed.

[0041] Preferably, the connection between the separation hole 5-7 and the palladium plate positioning hole 5-8 is located in the middle of the palladium plate positioning hole 5-8, so that the force applied to the palladium plate by the tool or hand is more even, making it easier to remove the palladium plate.

[0042] Meanwhile, the separation holes 5-7 also facilitate the placement of palladium plates by staff.

[0043] In other embodiments, the connection between the separation hole 5-7 and the palladium plate positioning hole 5-8 may also be located at the end of the palladium plate positioning hole 5-8.

[0044] In this utility model, the clamping mechanism can be the same as the clamping mechanism used for clamping and fixing palladium sheet and battery pack 7 in Chinese invention patent application publication number CN113118623A.

[0045] However, the structure of the above-mentioned clamping mechanism is relatively complex. In order to simplify the structure, this utility model also proposes a new clamping mechanism.

[0046] like Figures 1-5 As shown, in some embodiments, the clamping mechanism includes a support base 2, a pressure plate 1, and a locking mechanism for locking the support base 2 and the pressure plate 1. The pressure plate 1 is equipped with a pressure head for pressing the palladium sheet after being locked by the locking mechanism. The pressure head has a laser channel for laser to pass through, and the structure is simple.

[0047] In a preferred embodiment, the locking mechanism is a latch 4. A vertical plate 3 is fixedly connected to the support base 2, and the pressure plate 1 is provided with latch grooves 1-2 that match the latch 4. The latch 4 is installed on the vertical plate 3 by bolts and is used to lock the support base 2 and the pressure plate 1. By opening and closing the latch 4, the pressure plate 1 and the support base 2 can be easily locked together, thereby clamping the palladium sheet and the battery pack 7 between the pressure head and the support base 2, ensuring that the palladium sheet is tightly attached to the battery terminal and avoiding poor soldering.

[0048] In other embodiments, the locking mechanism consists of a locking bolt and a locking threaded hole provided on the support base 2. By tightening the locking bolt, the distance between the pressure head and the support base 2 can be brought closer, thereby clamping the palladium sheet and the battery pack 7 between the pressure head and the support base 2.

[0049] In the above embodiment, the pressure between the pressure head and the palladium sheet is hard pressure. If the operator operates improperly and causes excessive squeezing, the palladium sheet and battery pack 7 can easily be damaged.

[0050] To address the above problems, in a preferred embodiment, such as Figures 1-5 As shown, the pressure head includes a pressure cylinder 1-5 (the internal channel of the pressure cylinder 1-5 forms a laser channel) that slides and guides the pressure plate 1 in the up-down direction, and a baffle 1-8 connected to the outer peripheral surface of the pressure cylinder 1-5. A compression spring 1-7 is provided between the baffle 1-8 and the pressure plate 1 to apply a downward elastic force to the pressure head. The pressure cylinder 1-5 is made of thermally conductive materials such as copper.

[0051] The pressure plate 1 has a guide hole 1-1 and a pin hole 1-3. The pressure cylinder 1-5 is guided and slidably engaged with the guide hole 1-1. The guide pin 1-6 passes through the pin hole 1-3 and is guided and slidably engaged with the pin hole 1-3. A stop ring is provided in the pin hole 1-3. The guide pin 1-6 has a stop head located above the stop ring to prevent the guide pin 1-6 from separating from the pressure plate 1 after it is removed. The lower end of the guide pin 1-6 has a threaded hole. A bolt passes through the bolt hole on the baffle plate 1-8 and is threadedly connected to the guide pin 1-6. The bolt head supports the pressure head after the pressure plate 1 is removed to prevent the pressure head from falling off. A compression spring 1-7 is sleeved on the guide pin 1-6 and is located below the stop ring and between the stop ring and the baffle plate 1-8 to apply a downward elastic force to the pressure head. The spring provides cushioning, thereby changing the hard pressure into a soft pressure and preventing the palladium sheet and battery pack 7 from being crushed.

[0052] Preferably, the cross-section of the pressure cylinder 1-5 is V-shaped, meaning that the diameter of the pressure cylinder 1-5 gradually decreases from top to bottom. During laser welding, on the one hand, the pressure cylinder 1-5 has good thermal conductivity, which is conducive to heat dissipation; on the other hand, the pressure cylinder 1-5 can block the spattered welding slag, preventing non-welding parts from being contaminated by welding slag.

[0053] During assembly, to avoid reversing the installation of pressure plate 1, such as... Figures 1-2 As shown, in a preferred embodiment, the top of the upright plate 3 and the bottom of the pressure plate 1 are respectively provided with positioning pins and positioning holes 1-4. The positioning pins and positioning holes 1-4 are arranged asymmetrically to achieve a simple setup. When the pressure plate 1 is installed backwards, the positioning holes 1-4 and the positioning pins cannot be aligned, and the assembly cannot be successful, thereby avoiding the pressure plate 1 being installed backwards.

[0054] Reference Figures 1-2 As shown, during continuous production, different battery packs 7 need to be processed. Therefore, it is necessary to repeatedly remove the pressure plate 1 to place the battery pack 7 with the upper positioning plate 5-9 on the support base 2. The simple structure can effectively prevent the pressure plate 1 from being installed backwards, thus avoiding errors by workers in repetitive labor.

[0055] To facilitate the positioning of the battery pack 7 and determine the relative positions of the pressure cylinders 1-5 and the palladium sheet, in a preferred embodiment, such as... Figures 1-2As shown, the support base 2 is provided with a limiting groove for positioning the front and rear positions of the battery pack 7. The limiting groove extends to the left and right. The left or right end of the support base 2 is provided with a side positioning plate 6 for positioning the left and right positions of the battery pack 7.

[0056] The left and right positions of the battery pack 7 can be located by the side positioning plate 6, and the front and rear positions of the battery pack 7 can be located by the limiting groove, thereby locating the relative position of the battery pack 7 and the pressure plate 1, and further locating the relative position of the palladium sheet on the upper positioning plate 5-9 connected to the battery pack 7 and the pressure head on the pressure plate 1, so as to ensure that the pressure head presses on the palladium sheet.

[0057] In other embodiments, the position of the battery pack 7 may be moved before the locking mechanism locks in order to align the pressure head with the palladium plate.

[0058] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different embodiments to create the embodiments shown in the accompanying drawings. Of course, those skilled in the art can also create other embodiments not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A palladium sheet welding device, comprising an upper positioning plate and a clamping mechanism for clamping and fixing palladium sheets and a battery pack, wherein the upper positioning plate is provided with palladium sheet positioning holes, characterized in that, The upper positioning plate is bolted with front positioning parts and / or rear positioning parts for limiting the front and / or rear sides of the battery pack. The front end and / or rear end of the upper positioning plate are provided with elongated holes that extend in the front-rear direction and correspond to the corresponding positioning parts. The upper positioning plate is also bolted with left and / or right positioning parts for limiting the left and / or right sides of the battery pack. The left and / or right ends of the upper positioning plate are also provided with elongated holes that extend in the left and right directions and correspond to the corresponding positioning parts. After the bolt passes through the corresponding elongated hole, it is threaded into the corresponding positioning part.

2. The palladium sheet welding apparatus as described in claim 1, characterized in that, The lower right corner of the left positioning member and the lower left corner of the right positioning member are provided with guide ramps to provide guidance for the battery pack, forming a flared structure.

3. The palladium sheet welding apparatus as described in claim 1, characterized in that, The lower rear corner of the front positioning member and the lower front corner of the rear positioning member are provided with guide slopes to provide guidance for the battery pack, forming a flared structure.

4. The palladium sheet welding apparatus according to any one of claims 1 to 3, characterized in that, The upper positioning plate is also provided with a separation hole for tools and / or human hands to reach in so as to separate the palladium plate from the upper positioning plate. The separation hole is connected to the palladium plate positioning hole.

5. The palladium sheet welding apparatus as described in claim 4, characterized in that, The connection between the separation hole and the palladium plate positioning hole is located in the middle of the palladium plate positioning hole.

6. The palladium sheet welding apparatus according to any one of claims 1 to 3, characterized in that, The clamping mechanism includes a support base, a pressure plate, and a locking mechanism for locking the support base and the pressure plate. The pressure plate is equipped with a pressure head for pressing the palladium sheet after being locked by the locking mechanism. The pressure head has a laser channel for allowing laser light to pass through.

7. The palladium sheet welding apparatus as described in claim 6, characterized in that, The pressure head includes a pressure cylinder that slides and guides the pressure plate in the vertical direction and a baffle connected to the outer circumferential surface of the pressure cylinder. A compression spring is provided between the baffle and the pressure plate to apply a downward elastic force to the pressure head. The pressure cylinder is made of a heat-conducting material.

8. The palladium sheet welding apparatus as described in claim 6, characterized in that, A vertical plate is fixedly connected to the support base, and a latch for locking the support base and the pressure plate is installed on the vertical plate. The pressure plate is provided with a latch groove that matches the latch, and the latch constitutes the locking mechanism.

9. The palladium sheet welding apparatus as described in claim 6, characterized in that, A vertical plate is connected to the support base. The top of the vertical plate and the bottom of the pressure plate are respectively provided with positioning pins and positioning holes. The positioning pins and positioning holes are arranged asymmetrically to avoid the pressure plate being installed backwards.

10. The palladium sheet welding apparatus as described in claim 6, characterized in that, The support base is provided with a limiting groove for positioning the front and rear positions of the battery pack. The limiting groove extends to the left and right. The left or right end of the support base is provided with a side positioning plate for positioning the left and right positions of the battery pack.

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