Battery cell welding cover plate and battery pack laser welding clamp

Abstract

The utility model relates to the technical field of welding tools, and discloses a battery cell welding cover plate and at least two welding units, each welding unit comprises a cover plate body, the cover plate body is provided with a positioning groove used for placing a battery cell, a nickel sheet and an aluminum row, and the positioning groove is provided with a window penetrating through the cover plate body and used for facilitating welding of the nickel sheet and the aluminum row; the pressing test assembly is detachably connected with the cover plate body and used for abutting against the periphery of the nickel sheet and pressing and fixing the nickel sheet to the aluminum bar; the pressure head assembly is detachably connected with the cover plate body, the pressure head assembly comprises a pressure head and a first spring ejector pin, the pressure head is slidably connected with the cover plate body, one end of the first spring ejector pin is fixedly connected with the cover plate body, the other end of the first spring ejector pin is connected with the pressure head, and the first spring ejector pin is used for enabling the pressure head to press and fix an aluminum row on a battery cell; and the welding port is communicated with the window. A battery pack laser welding clamp comprises a battery cell welding cover plate. According to the utility model, the tilting and bias pressing phenomena can be avoided when the aluminum bar or the nickel sheet is welded, pressed and fixed.

Description

Technical Field

[0001] This utility model belongs to the field of welding tooling technology, specifically relating to a cell welding cover plate and a laser welding fixture for battery packs. Background Technology

[0002] Cylindrical cells, as a commonly used basic unit in energy storage, are widely used in battery systems. Traditional cylindrical cells typically have their positive and negative electrodes on different sides. During laser welding, the cell needs to be flipped, which not only adds production steps but also consumes additional time and cost. With technological advancements, cells with positive and negative electrodes on the same side have emerged. Compared to traditional cylindrical cells, these cells have their positive and negative electrodes on the same side, allowing for laser welding on the same surface. This effectively eliminates the cell flipping step and reduces costs to some extent.

[0003] In traditional welding processes, the close proximity of the positive and negative electrodes on the same side of the battery cell makes it difficult to apply a structure where the entire plate of pressure head presses down to fix the aluminum busbar. This necessitates disassembling the battery into separate positive and negative electrode laser-welded cover plates. Each battery cell requires a separate positive and negative electrode pressure head, which is then fixed to a different cover plate, significantly increasing fixture costs. Furthermore, uneven force during the pressing process often leads to the nickel sheet easily lifting, causing damage and making repair and replacement inconvenient. Traditional pressure heads, especially those used as a single plate, are prone to causing uneven pressure on either the positive or negative electrode. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides a cell welding cover plate and a battery pack laser welding fixture. The nickel sheet and aluminum busbar are fixed by a pressure test component and a pressure head component, respectively, and welding is performed using a window on the cover plate body. This achieves differential adjustment that the pressure fixing component cannot achieve, and also facilitates replacement and maintenance.

[0005] The technical effects to be achieved by this utility model are realized through the following aspects:

[0006] In a first aspect, this utility model provides a battery cell welding cover plate, comprising at least two welding units, wherein the welding unit includes:

[0007] The cover plate body is provided with a positioning groove for placing the battery cell, nickel sheet and aluminum busbar. The positioning groove is provided with a window that penetrates the cover plate body to facilitate the welding of the nickel sheet and the aluminum busbar.

[0008] A pressure testing assembly, detachably connected to the cover plate body, is used to press against the periphery of the nickel sheet and firmly fix the nickel sheet to the aluminum busbar; and

[0009] The pressure head assembly is detachably connected to the cover plate body. The pressure head assembly includes a pressure head and a first spring pin. The pressure head is slidably connected to the cover plate body. One end of the first spring pin is fixedly connected to the cover plate body, and the other end is connected to the pressure head. It is used to make the pressure head press and fix the aluminum busbar to the battery cell. The pressure head is provided with a welding port, which is connected to the window.

[0010] In some implementations, the pressure testing component is a test probe, and the test probe has a spring inside for retraction of the test probe.

[0011] In some implementations, the pressure testing assembly includes four test probes, which are respectively connected to the four corners of the nickel sheet.

[0012] In some implementations, the four test probes are positioned near the middle of the window and are symmetrically distributed.

[0013] In some implementations, the window includes a positive electrode section and a negative electrode section, the pressure head assembly is located on one side of the positive electrode section, and the cover plate body is provided with a second spring pin near the negative electrode section for pressing and fixing the aluminum busbar located in the negative electrode section to the battery cell.

[0014] In some implementations, the negative electrode segment forms a C-shaped window around the second spring pin.

[0015] In some implementations, the second spring pin and the pressure test assembly are arranged in a triangular configuration.

[0016] In some implementations, the pressure head assembly includes two first spring pins symmetrically arranged on both sides of the weld joint.

[0017] In some implementations, the first spring pin has a threaded structure for adjusting the relative position of the first spring pin on the cover plate body and the aluminum strip.

[0018] Secondly, this utility model provides a battery pack laser welding fixture, including the cell welding cover plate described in any of the above implementations.

[0019] In summary, this utility model has at least the following advantages:

[0020] This utility model provides a cell welding cover plate and a battery pack laser welding fixture. The cell welding cover plate is fastened to the cell electrode post and has windows for welding nickel sheets and aluminum busbars on the cover plate body. A pressing test assembly for pressing and fixing nickel sheets is provided in the cover plate body. The pressing test assembly abuts against the circumference of the nickel sheets, which can effectively prevent the nickel sheets from lifting. The pressure head assembly uses the combination of the first spring pin and the pressure head to realize differential adjustment of the pressing fixing component. The regional pressing of the pressing test assembly and the pressure head assembly can avoid the phenomenon of welding pressure deviation. Moreover, it is not necessary to rely on the motor to control the position movement of the pressure head, which greatly improves the welding efficiency. Both the pressure head assembly and the pressing test assembly are detachable parts, which facilitates the replacement and handling of later maintenance. Attached Figure Description

[0021] Figure 1 This is an exploded structural diagram of the battery cell welding cover plate of Embodiment 1 of this utility model.

[0022] Figure 2 This is a schematic diagram of the cooperation structure between the aluminum busbar, nickel sheet and battery cell in Embodiment 1 of this utility model.

[0023] Figure 3 This is an exploded structural diagram of the battery cell welding cover plate of Embodiment 2 of this utility model.

[0024] Figure 4 This is an exploded structural diagram of the battery pack laser welding fixture of Embodiment 3 of this utility model.

[0025] Marked in the image:

[0026] 1. Cover plate body; 11. Window; 2. Pressure test assembly; 21. Test probe; 3. Pressure head assembly; 31. Pressure head; 311. Weld joint; 32. First spring pin; 33. Second spring pin; 4. Aluminum busbar; 5. Nickel sheet; 6. Battery cell; 61. Positive electrode of battery cell; 62. Negative electrode of battery cell; 100. Battery cell welding cover plate; 101. Upper housing; 102. Lower housing; 103. Battery pack; 104. Buckle. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this utility model, not all embodiments.

[0028] Therefore, the following detailed description of the embodiments of the present 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 present invention without inventive effort are within the scope of protection of the present invention.

[0029] Example 1:

[0030] Please see Figure 1 and Figure 2 The present invention relates to the structure of a battery cell welding cover plate 100.

[0031] like Figure 1 As shown, the battery cell welding cover plate 100 of this utility model includes: a cover plate body 1, which is provided with a positioning groove for placing the battery cell 6, nickel sheet 5 and aluminum busbar 4. The positioning groove is provided with a window 11 that penetrates the cover plate body 1 to facilitate the welding of the nickel sheet 5 and the aluminum busbar 4; a pressure test assembly 2, which is detachably connected to the cover plate body 1 and is used to press against the periphery of the nickel sheet 5 and press the nickel sheet 5 to the aluminum busbar 4; and a pressure head assembly 3, which is detachably connected to the cover plate body 1. The pressure head assembly 3 includes a pressure head 31 and a first spring pin 32. The pressure head 31 is slidably connected to the cover plate body 1. One end of the first spring pin 32 is fixedly connected to the cover plate body 1, and the other end is connected to the pressure head 31 to press the aluminum busbar 4 to the battery cell 6. The pressure head 31 is provided with a welding port 311, which is connected to the window 11.

[0032] Specifically, the cover plate body 1 is installed at the terminal of the battery cell 6. The bottom of the cover plate body 1 is provided with a positioning groove, which is used to limit and fix the nickel sheet 5 and aluminum busbar 4 placed at the terminal of the battery cell 6. A window 11 is provided on the positioning groove, which penetrates the cover plate body 1. The window 11 is positioned facing the positive terminal 61 of one battery cell 6, the negative terminal 62 of another battery cell 6, and the position of the nickel sheet 5 on the aluminum busbar 4, which facilitates laser welding. The pressure test component 2 is an independent accessory that can be detachably installed at the bottom of the cover plate body 1. It is used to press down the cover plate body 1 to press the nickel sheet 5, so that the nickel sheet 5 is fixed on the aluminum busbar 4. The pressure test component 2 can hold the nickel sheet 5 against the four edges of the aluminum busbar 4, so that the nickel sheet 5 is not easy to lift or become uneven, which would lead to defective welded products. The pressure head assembly 3 is also detachably connected to the cover plate body 1. The pressure head assembly 3 includes a pressure head 31 and a first spring pin 32. One end of the first spring pin 32 abuts against the cover plate body 1, and the other end abuts against the pressure head 31, allowing the pressure head 31 to slide vertically within the cover plate body 1. The cooperation between the first spring pin 32 and the pressure head 31 enables the pressure head assembly 3 to have an adjustable stroke, so that the pressure head 31 can press the aluminum busbar 4 located at the positive electrode 61 of the battery cell and compensate for the thickness tolerance of the aluminum busbar 4. The pressure head 31 has a welding port 311 at a position relative to the aluminum busbar 4 of the positive electrode 61 of the battery cell. The welding port 311 communicates with the window 11 of the top cover plate body 1 and is used for laser welding that can pass through and act on the aluminum busbar 4 in the middle area of ​​the welding port 311, thereby realizing the welding work of the aluminum busbar 4 of the positive electrode 61 of the battery cell.

[0033] It is worth noting that, such as Figure 2 As shown, in this embodiment, the positive electrode 61 and negative electrode 62 of the battery cell 6 are located on the same side. The contact point of the positive electrode 61 is arc-shaped, while the height of the negative electrode 62 is higher than that of the negative electrode 62 and is cylindrical. The aluminum busbar 4 has a ladder-shaped structure and connects the negative electrode 62 of the previous battery cell 6 and the positive electrode 61 of the next battery cell 6, respectively.

[0034] In addition, traditional cell welding uses a single pressure head, which requires the equipment motor to control the single pressure head to move along the welding potential to the next position. This affects the overall production efficiency. Moreover, conventional pressure fixing components cannot achieve differential adjustment. In contrast, the cell welding cover plate 100 of this application uses a detachable pressure head assembly 3 to achieve welding and fixing of the aluminum busbar 4. The pressure head assembly 3 can press down with the cover plate body 1 to press the aluminum busbar 4 against the cell welding position. The pressure head assembly 3 exists independently in each welding unit and does not need to be moved in conjunction with laser welding to achieve position adjustment. Furthermore, the pressure head assembly 3 is elastic, which allows the pressure head assembly 3 in each welding unit to adaptively adjust the pressing stroke to achieve consistency in pressing against the aluminum busbar 4.

[0035] Furthermore, the pressure head 31 may be, but is not limited to, a brass pressure head 31, in order to withstand the burns from spatter during laser welding. Of course, the pressure head 31 may be replaced by other elastic pressure blocks, either individually or in combination, as long as they can withstand the high temperature of welding. This application does not limit this.

[0036] It is understood that the above-mentioned implementation of the cell welding cover plate 100 is only for example and can be understood as a welding unit. The cell welding cover plate 100 can be used for welding multiple sets of cells 6, that is, multiple welding units cooperate and are all set on a single cover plate body 1. The cover plate body 1 includes multiple sets of windows 11, and each window 11 is correspondingly set with a pressure test component 2 and a pressure head component 3. The arrangement direction of the cells 6 can be determined according to the actual situation.

[0037] During operation, the cover plate body 1 is fastened onto the battery cell 6 and the positioning groove is used to initially position the battery cell 6, nickel sheet 5 and aluminum busbar 4. The battery cell welding cover plate 100 uses an external clamp to press down on the battery cell 6, which drives the pressing test component 2 on the cover plate body 1 to press down, so that it can press against the periphery of the nickel sheet 5 and press the nickel sheet 5 against the middle of the aluminum busbar 4. At the same time, the pressing head component 3 on the cover plate body 1 is also driven to press down. The pressing head component 3 cooperates with the pressing head 31 and the first spring pin 32. The pressing head 31 presses against the aluminum busbar 4. The first spring pin 32 can adaptively adjust according to the thickness of the aluminum busbar 4 to ensure that the aluminum busbar 4 can be stably pressed on the positive electrode 61 of the battery cell. When the cell welding cover plate 100 completes the pressing action, and the aluminum busbar 4 and nickel sheet 5 are pressed and fixed in the corresponding positions on the cell 6, the laser passes through the reserved window 11 on the cover plate body 1 to perform the welding action, and performs welding processing on the aluminum busbar 4 of the positive electrode 61 of the cell, the aluminum busbar 4 of the negative electrode 62 of the cell, and the nickel sheet 5 on the aluminum busbar 4 respectively.

[0038] In this embodiment, the pressure testing component 2 can prevent uneven force on the nickel sheet 5 during the pressure process, avoiding the situation where the aluminum busbar 4 and nickel sheet 5 on the battery cell 6 are not uniformly welded, or the battery cell 6 has poor welding. The pressure testing component 2 can press the aluminum busbar 4 and can compensate for the pressure according to the thickness. The elasticity of the pressure testing component 2 can avoid causing irreversible indentations to the aluminum busbar 4 or the battery cell 6. This pressing method can further improve the welding quality. In addition, both the pressure testing component 2 and the pressure head component 3 are made of metal standard parts, which makes maintenance and replacement convenient. Their parts are easy to obtain and low in cost. The segmented pressing and fixing of the aluminum busbar 4 and nickel sheet 5 avoids the phenomenon of pressure deviation. Moreover, each battery cell 6 corresponds to a set of pressure head components 3. There is no need to rely on the driving equipment to adjust the position of the pressure head 31 and the pressing action. The positioning groove and the cover plate body 1 alone can achieve the pressing and fixing of the nickel sheet 5 and the aluminum busbar 4, improving the efficiency of welding production.

[0039] Example 2:

[0040] This embodiment is a further structural optimization of the battery cell welding cover plate 100 of this utility model. Please refer to [link / reference]. Figure 3 .

[0041] In some embodiments, the pressure test component 2 is a test probe 21, and the test probe 21 is provided with a spring for the test probe 21 to retract.

[0042] Specifically, the pressure test assembly 2 uses the test probe 21 to press and fix the nickel sheet 5. In addition to making the overall structure compact and easy to replace, the test probe 21 can reserve enough space for laser welding at the welding station. As the cover plate body 1 is pressed down, the test probe 21 can retract through its internal spring when it comes into contact with the nickel sheet 5. This allows it to rise a certain distance, which can buffer and dampen shocks and adjust the height difference without damaging the nickel sheet 5. It also improves the applicability of welding different nickel sheets 5.

[0043] Understandably, the test probe 21 of each welding unit is electrically connected to an external testing device to perform resistance tests on the nickel sheet 5 and the battery cell 6 at the aluminum busbar 4 at various stages, so as to accurately evaluate the welding quality.

[0044] Accordingly, the pressure test component 2 can be a non-test elastic probe or a small elastic pin, which facilitates the use of clamping and fixing the nickel sheet 5. This application does not limit this.

[0045] In some embodiments, the pressure test assembly 2 includes four test probes 21, which are respectively connected to the four corners of the nickel sheet 5.

[0046] Specifically, the pressure test assembly 2 uses four test probes 21 to press and fix the nickel sheet 5. The four test probes 21 are distributed at the edge of the window 11 near the nickel sheet 5 and are used to press against the four corners of the nickel sheet 5. This reduces the direct pressure and damage to the welding area. Moreover, this method of pressing the nickel sheet 5 from multiple directions allows the nickel sheet 5 to maintain a stable position during the welding process, preventing the nickel sheet 5 from being displaced due to welding external forces or other factors. It also helps to make the nickel sheet 5 fit better with the aluminum busbar 4.

[0047] To enhance stability, in some embodiments, four test probes 21 are positioned near the middle of the window 11 and are symmetrically distributed. The window 11 separates the four test probes 21 in pairs, and they are respectively installed on the cover plate body 1 on both sides of the window 11. This can prevent the test probes 21 from being concentrated in the same area and all of them from being affected by vibration or interference, thus reducing the welding effect of the nickel sheet 5.

[0048] Furthermore, the test probe 21 is made of beryllium copper and has a gold-plated surface, which makes the instantaneous heat resistance temperature of the test probe 21 high, and its strength and hardness can meet the requirements of high-intensity work.

[0049] In some embodiments, the window 11 includes a positive electrode section and a negative electrode section, the pressure head assembly 3 is located on one side of the positive electrode section, and the cover plate body 1 is provided with a second spring pin 33 near the negative electrode section for pressing and fixing the aluminum busbar 4 located in the negative electrode section to the battery cell 6.

[0050] Specifically, the window 11 on the cover plate body 1 extends from the positive electrode 61 of the previous battery cell 6 to the negative electrode 62 of the next battery cell 6. That is, the window 11 includes a positive electrode section and a negative electrode section. The pressure head assembly 3 is located at the positive electrode section of the window 11, and the cover plate body 1 is also provided with a second spring pin 33. The second spring pin 33 is specifically located at the negative electrode section of the window 11 and is used to press and fix the aluminum busbar 4. One end of the aluminum busbar 4 is fixed to the negative electrode 62 of the battery cell by the pressure head assembly 3, and the other end is fixed to the positive electrode 61 of the battery cell by the second spring pin 33. The method of fixing both ends facilitates laser welding and also ensures the stability of fixing the aluminum busbar 4.

[0051] In some embodiments, the negative electrode section forms a C-shaped window 11 around the second spring pin 33.

[0052] Specifically, at the negative electrode section of window 11, the window 11 is distributed in a C-shape around the second spring pin 33. During welding, the aluminum busbar 4 is welded at the position of the negative electrode 62 of the battery cell corresponding to the C-shaped window 11. The laser welding path is C-shaped.

[0053] Furthermore, in order to better adapt to different specifications of battery cells 6, the C-shaped window 11 can also adopt other structural methods in practical applications to facilitate the planning of welding paths. The welding path of the aluminum busbar 4 at the negative electrode 62 of the battery cell can be in the shape of two semicircles or in the shape of several arcs.

[0054] In some embodiments, the second spring pin 33 is arranged in a triangle with the pressure test assembly 2.

[0055] Specifically, the pressure test component 2 and the second spring pin 33 are respectively set on the positive electrode 61 of the previous battery cell 6 and the negative electrode 62 of the next battery cell 6. The two form a triangular structure on the cover plate body 1, making full use of the space on the cover plate body 1, and making the fixing effect of the aluminum busbar 4 more stable.

[0056] In some embodiments, the pressure head assembly 3 includes two first spring pins 32, which are symmetrically arranged on both sides of the welding joint 311.

[0057] Specifically, the pressure head 31 of the pressure head assembly 3 has a square structure and is provided with a through welding port 311. Two first spring pins 32 are provided on the cover plate body 1. The two spring pins are separated by the window 11 and are symmetrically distributed on both sides. The two spring pins are also symmetrical on both sides of the welding port 311 to connect the pressure head 31 to achieve linkage and enhance the stability of the pressure head assembly 3.

[0058] In some embodiments, the first spring pin 32 is provided with a threaded structure for adjusting the relative position of the first spring pin 32 on the cover plate body 1 and the aluminum strip 4.

[0059] Specifically, the pressure head assembly 3 is an adjustable structure. A threaded structure is provided on one end of the cover plate body 1 on the first spring pin 32, so that the first spring can be adjusted to adapt to the welding of aluminum strips 4 of different thicknesses.

[0060] In this embodiment, the pressure test assembly 2 uses a test probe 21 to press and fix the nickel sheet 5. The test probe 21 can adapt to the welding requirements of smaller nickel sheets 5, and also makes replacement convenient and inexpensive. The pressure head assembly 3 uses two first spring pins 32 to cooperate with the pressure head 31 to press the aluminum busbar 4 against the negative electrode 62 of the battery cell. The first spring pins 32 can be adjusted by the thread structure to adapt to aluminum busbars 4 of different thicknesses. The second spring pin 33 of the pressure head assembly 3 presses the aluminum busbar 4 against the positive electrode 61 of the battery cell. The second spring pin 33 and the pressure head 31 form a triangular structure, making the fixing effect of the aluminum busbar 4 more stable.

[0061] Example 3:

[0062] like Figure 4 As shown, a battery pack laser welding fixture is provided, including the cell welding cover plate 100 in Embodiment 1 or Embodiment 2.

[0063] Specifically, the battery pack laser welding fixture includes two parts: an upper housing 101 and a lower housing 102. The upper housing 101 and the lower housing 102 are connected to form a cavity for accommodating the battery pack 103. The upper housing 101 frames the cell welding cover plate 100, and the upper housing 101 and the lower housing 102 are locked together by a fastener 104. The battery pack 103 is formed by fixing several cells 6 with a bracket. The welding positions on the cell welding cover plate 100 correspond one-to-one with the positions of the cells 6 inside the battery pack 103, so that the laser can pass through the cell welding cover plate 100 to weld the cells 6. In addition, the upper housing 101 and the lower housing 102 are fixed together by the fastener 104. The fastener 104 enables the battery pack laser welding fixture to clamp the battery pack 103 between the upper housing 101 and the lower housing 102, thereby pressing down the cell welding cover plate 100 and pressing the nickel sheet 5 and aluminum busbar 4 against each cell 6 of the battery pack 103.

[0064] It is worth noting that the battery pack 103 is placed inside the lower housing 102 of the battery pack laser welding fixture, and then the cell welding cover plate 100 of the upper housing 101 is aligned with the battery pack 103. Subsequently, the upper housing 101 and the lower housing 102 are fastened and fixed by the fasteners 104 at the connection points on both sides. The fastening action of the fasteners 104 drives the pressing test component 2 of the cell welding cover plate 100 to press down and press against the nickel sheet 5 and the pressing head component 3 to press down and press against the aluminum strip 4. The opening and closing of the fasteners 104 makes the operation more convenient and faster.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In the description of this utility model, it should be noted that the terms "center," "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 product of this utility model is in use. They are only for the convenience of describing this utility model and 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 this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0067] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0068] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may 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" the first 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 first 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.

[0069] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A battery cell welding cover plate, characterized in that, It includes at least two welding units, each welding unit comprising: The cover plate body is provided with a positioning groove for placing the battery cell, nickel sheet and aluminum busbar. The positioning groove is provided with a window that penetrates the cover plate body to facilitate the welding of the nickel sheet and the aluminum busbar. A pressure testing assembly, detachably connected to the cover plate body, is used to press against the periphery of the nickel sheet and firmly fix the nickel sheet to the aluminum busbar; and The pressure head assembly is detachably connected to the cover plate body. The pressure head assembly includes a pressure head and a first spring pin. The pressure head is slidably connected to the cover plate body. One end of the first spring pin is fixedly connected to the cover plate body, and the other end is connected to the pressure head. It is used to make the pressure head press and fix the aluminum busbar to the battery cell. The pressure head is provided with a welding port, and the welding port is connected to the window.

2. The cell welding cover plate according to claim 1, characterized in that, The pressure testing component is a test probe, and the test probe has a spring inside for the retraction of the test probe.

3. The cell welding cover plate according to claim 2, characterized in that, The pressure testing assembly includes four test probes, which are respectively connected to the four corners of the nickel sheet.

4. The cell welding cover plate according to claim 3, characterized in that, The four test probes are positioned near the middle of the window and are symmetrically distributed.

5. The cell welding cover plate according to claim 1, characterized in that, The window includes a positive electrode section and a negative electrode section. The pressure head assembly is located on one side of the positive electrode section. The cover plate body is provided with a second spring pin near the negative electrode section for pressing and fixing the aluminum busbar located in the negative electrode section to the terminal post of the battery cell.

6. The cell welding cover plate according to claim 5, characterized in that, The negative electrode section is C-shaped around the second spring pin.

7. The cell welding cover plate according to claim 6, characterized in that, The second spring pin and the pressure test assembly are arranged in a triangle.

8. The cell welding cover plate according to claim 1, characterized in that, The pressure head assembly includes two first spring pins, which are symmetrically arranged on both sides of the weld joint.

9. The cell welding cover plate according to claim 8, characterized in that, The first spring pin has a threaded structure for adjusting the relative position of the first spring pin on the cover plate body and the aluminum strip.

10. A battery pack laser welding fixture, characterized in that, Includes the cell welding cover plate as described in any one of claims 1-9.

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