Laser welding method for multilayer tab of battery cell, and battery manufacturing method

Abstract

A laser welding method for a multilayer tab of a battery cell and a battery manufacturing method, the laser welding method comprising preparing a multilayer tab to be welded, an adapter piece, a welding-assisting part, press-fitting tooling and a laser welding device. The press-fitting tooling comprises a first pressing plate and a second pressing plate. The adapter piece is placed on the first pressing plate; the multilayer tab is placed on the side of the adapter piece away from the first pressing plate; the second pressing plate is pressed against the side of the multilayer tab away from the adapter piece, and the side of the multilayer tab close to the second pressing plate can protrude from at least the edge side of the second pressing plate; and the laser welding device is used to weld the multilayer tab to the adapter piece.

Description

Laser welding method for multi-layer tabs of battery cells and battery manufacturing method

[0001] Related applications

[0002] This application claims priority to Chinese patent applications filed on February 20, 2024, with application number 202420320363.2, filed on February 20, 2024, with application number 202410188962.8, filed on February 20, 2024, with application number 202410188963.2, filed on February 20, 2024, and with application number 202410181517.9, filed on February 18, 2024, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a method for laser welding multi-layer tabs of a battery cell and a method for manufacturing a battery. Background Art

[0004] During battery manufacturing, welding multi-layer tabs to adapters is a crucial step. Adapters play a crucial role in connecting the battery, making the welding process particularly crucial. Traditionally, the tabs and adapters are welded together by first pre-welding the tabs with ultrasonic welding, then welding the pre-welded tabs to the adapters. This complex welding process significantly impacts battery production efficiency. Therefore, it is necessary to develop a multi-tab welding method that can improve battery production efficiency.

[0005] Summary of the Invention

[0006] The main purpose of this application is to propose a laser welding method for multi-layer tabs of battery cells and a battery manufacturing method, aiming to solve the technical problem of how to improve the welding efficiency of multi-tabs of battery cells to improve battery production efficiency.

[0007] To achieve the above objectives, the present application proposes a method for laser welding multi-layer tabs of a battery cell, which includes the following steps:

[0008] Placing the adapter plate on the first pressing plate;

[0009] Placing the multi-layer tab on a side of the adapter sheet facing away from the first pressing plate;

[0010] Pressing the second pressing plate onto the side of the multi-layer tab facing away from the adapter sheet, and the side of the multi-layer tab close to the second pressing plate can at least protrude beyond the edge of the second pressing plate;

[0011] The multi-layer tab is welded to the adapter plate using the laser welding device.

[0012] To achieve the above objectives, the present application further proposes a press-fitting tool for press-fitting the tab onto the adapter plate of the battery top cover, which is applied to the above-mentioned battery cell multi-layer tab laser welding method. The press-fitting tool comprises:

[0013] The first pressing plate is provided with a battery top cover placement position;

[0014] A second pressing plate is provided with a main body and a pressing head, wherein the pressing head extends from the main body toward the battery top cover placement position, and a pressing surface is provided on a side of the pressing head close to the battery top cover placement position, wherein the pressing surface is a curved surface or an inclined surface;

[0015] The second pressing plate can be raised and lowered relative to the first pressing plate, so that the pressing surface contacts the tab and presses the tab onto the adapter.

[0016] To achieve the above objectives, the present application further proposes an adapter for connecting the tab and the top cover of a battery, the adapter comprising:

[0017] matrix;

[0018] A boss is provided on a side wall of the base along the thickness direction thereof, and the boss is used for welding the tab;

[0019] The boss is suitable for pressing the tab to deform the tab, so as to pre-tighten the tab before welding it.

[0020] In one embodiment, the present application further provides a battery, comprising the adapter as described above.

[0021] To achieve the above object, the present application further provides a battery manufacturing method, wherein the battery cell multi-layer tab laser welding method described in any of the above embodiments is used for manufacturing, and the battery manufacturing method comprises the following steps:

[0022] After welding the multi-layer tabs to the adapter sheet, an assembly is obtained;

[0023] preparing a housing having a receiving cavity with one end open;

[0024] Place the end of the assembly facing away from the adapter plate into the accommodating cavity through the opening;

[0025] Buckle the top cover onto the opening;

[0026] The top cover is welded to the housing to seal the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] FIG1 is a schematic structural diagram of a press-fitting tool from a first perspective in one embodiment of the present application;

[0029] FIG2 is a schematic structural diagram of a press-fitting tool from a second perspective in one embodiment of the present application;

[0030] FIG3 is an enlarged schematic diagram of a portion A in FIG2 , wherein the multi-layer tab is in a tensioned state under the action of the pressure head and the boss;

[0031] FIG4 is a schematic structural diagram of the second pressing plate in one embodiment of the present application; wherein the opening of the laser through hole at one end facing away from the first pressing plate is tapered;

[0032] FIG5 is a schematic structural diagram of the first pressing plate in one embodiment of the present application; wherein the first pressing plate is provided with a first positioning portion and a second positioning portion. It should be noted that the first positioning portion and the second positioning portion may be groove structures or other structures having positioning and limiting functions;

[0033] FIG6 is a schematic structural diagram of an assembly obtained by welding a multi-layer tab to an adapter sheet in one embodiment of the present application;

[0034] FIG7 is a schematic structural diagram of a battery in one embodiment of the present application;

[0035] FIG8 is a schematic structural diagram of an adapter sheet according to an embodiment of the present application;

[0036] FIG9 is a schematic diagram showing the positional relationship between the press head, the multi-layer tab, and the adapter in one embodiment of the present application; wherein the extending direction of the press head is perpendicular to the direction from the first pressing plate to the second pressing plate;

[0037] FIG10 is a schematic flow chart of a welding method for laser welding multiple tabs of a battery cell according to an embodiment of the present application;

[0038] FIG11 is an axonometric view of a press-fitting tool according to an embodiment;

[0039] FIG12 is a side view of a press-fitting tool according to an embodiment;

[0040] FIG13 is an enlarged view of the dotted line area in the side view of the press-fitting tool according to one embodiment;

[0041] FIG14 is a schematic structural diagram of an embodiment of a press-fitting tool of the present application;

[0042] FIG15 is a schematic diagram of the planar structure of an embodiment of the press-fitting tool of the present application from a side view;

[0043] FIG16 is a schematic structural diagram of an embodiment of the first pressing plate of the present application;

[0044] FIG17 is a structural diagram of an embodiment of the fixed base plate and the first guide member of the present application;

[0045] FIG18 is a schematic diagram of the planar structure of an embodiment of the first pressing plate of the present application from a side view;

[0046] FIG19 is a schematic diagram of the planar structure of an embodiment of the press-fitting tool of the present application from a top view;

[0047] FIG20 is a schematic diagram of the cross-sectional structure along the cross-sectional line AA in FIG19;

[0048] FIG21 is a schematic diagram of the cross-sectional structure along the cross-sectional line BB in FIG19;

[0049] FIG22 is a schematic structural diagram of an embodiment of a second pressing plate of the present application;

[0050] FIG23 is a schematic structural diagram of an embodiment of a mounting member and an adsorption member of the present application;

[0051] FIG24 is a schematic diagram of the planar structure of an embodiment of a mounting member and an adsorption member of the present application from a side view;

[0052] FIG25 is a schematic diagram of the structure of a battery in an embodiment of the present application; wherein the adapter is not shown;

[0053] FIG26 is a cross-sectional schematic diagram of a battery in one embodiment of the present application;

[0054] FIG27 is a partial enlarged schematic diagram of point A in FIG26;

[0055] FIG28 is a schematic structural diagram of an adapter in an embodiment of the present application; wherein the top surface of the boss is a plane and the two side surfaces are arc surfaces;

[0056] FIG29 is a side view of an adapter sheet in one embodiment of the present application, showing the first end and the second end;

[0057] FIG30 is a schematic structural diagram of an adapter in an embodiment of the present application; wherein the top surface of the boss is a plane and the two side surfaces are arc surfaces plus inclined planes;

[0058] FIG31 is a schematic structural diagram of an adapter in an embodiment of the present application; wherein the top surface of the boss is a semi-elliptical surface and is directly connected to the side wall of the base;

[0059] FIG32 is a schematic structural diagram of an adapter in an embodiment of the present application; wherein the top surface of the boss is a plane and the four side surfaces are inclined planes;

[0060] Figure 33 is a structural schematic diagram of the adapter in one embodiment of the present application; wherein, the top surface of the boss is an arc surface and the top surface is directly connected to the side wall of the base.

[0061] Description of Figure Numbers:

[0062] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0064] With the rapid development of the new energy storage industry, the demand for energy storage batteries is also increasing. The adapter is an important component that connects the internal tabs of the battery to the battery cover, and plays an important role in the intermediate series connection. The tabs can conduct the current in the battery cell to the adapter. When the power of the battery is further improved, in order to further reduce the resistance of the battery during charging, a multi-tab process can be used. Each layer of the battery cell has a positive and negative pole, and each layer is provided with tabs. In this way, the distance for the charge to flow to each layer is shortened exponentially, and the internal resistance of the battery is reduced. In addition, the multi-tab is equivalent to increasing the cross-section of the wire, which can withstand a larger current and effectively reduce the heat generated by the battery during charging.

[0065] However, due to the unique structure of the multi-layer tabs, in order to ensure the welding reliability of the multi-layer tabs and the adapter, the multi-layer tabs are usually pre-welded into one piece before being welded to the adapter. This results in low battery production efficiency.

[0066] If the multi-layer tabs are directly welded to the adapter without going through the pre-welding process, the welding between the multi-layer tabs and the adapter will result in cold welding or desoldering, causing the battery cell to be unable to be used normally, which will in turn lead to a decrease in the battery yield.

[0067] In view of this, referring to FIG. 1 to FIG. 10 , the present application provides a laser welding method for a battery cell 211 and a multilayer tab 212 , the welding method comprising the following steps:

[0068] Prepare the multi-layer tabs 212 and adapter plates 213 to be welded;

[0069] Prepare a press-fitting tool 10 and a laser welding device 30 , wherein the press-fitting tool 10 includes a first pressing plate 11 and a second pressing plate 12 ;

[0070] Place the adapter plate 213 on the first pressing plate 11;

[0071] Place the multi-layer tab 212 on the side of the adapter plate 213 facing away from the first pressing plate 11;

[0072] Press the second pressing plate 12 onto the side of the multi-layer tab 212 facing away from the adapter plate 213, and the side of the multi-layer tab 212 close to the second pressing plate 12 can at least protrude from the edge of the second pressing plate 12;

[0073] The multi-layer tab 212 is welded to the adapter 213 using a laser welding device 30 .

[0074] Specifically, first prepare the multi-layer tab 212 and the adapter 213 to be welded, and prepare the press-fitting tool 10 and the laser welding device 30. It should be noted that there is no restriction on the order of preparation of the multi-layer tab 212, the adapter 213, the press-fitting tool 10 and the laser welding device 30, and the preparation order can be freely changed according to the specific situation. Place the adapter 213 on the first pressing plate 11, and then place the multi-layer tab 212 on the side of the adapter 213 away from the first pressing plate 11. The second pressing plate 12 is pressed on the side of the multi-layer tab 212 away from the adapter 213. Under the pressing of the second pressing plate 12, the multi-layer tab 212 and the adapter 213 can be tightly fitted together. The part of the multi-layer tab 212 to be welded is exposed on the second pressing plate 12, and the position of the laser welding device 30 relative to the multi-layer tab 212 is adjusted so that the laser welding device 30 is aligned with the welding part of the multi-layer tab 212. The laser welding device 30 is configured to emit laser light 31 toward the portion of the multilayer tab 212 to be welded, thereby welding the multilayer tab 212 to the adapter 213. The process of pressing the multilayer tab 212 onto the adapter 213 through press-fitting allows the multilayer tab 212 to fit tightly to the adapter 213, effectively preventing cold welds and improving the reliability of the weld between the multilayer tab 212 and the adapter 213. This solution eliminates the need for pre-welding of the multilayer tab 212, effectively improving the manufacturing efficiency of the battery 20.

[0075] In order to enable the laser welding device 30 to be quickly positioned at the welding portion of the multi-layer tab 212, in some embodiments, referring to Figures 1 and 4, the second pressing plate 12 has a laser through hole 121. When the second pressing plate 12 is pressed onto the multi-layer tab 212, the welding portion of the multi-layer tab 212 can be exposed through the laser through hole 121, and the laser welding device 30 emits laser 31 toward the laser through hole 121 to weld the multi-layer tab 212 to the adapter 213. After the adapter 213 and the multi-layer tab 212 are welded, the second pressing plate 12 moves away from the first pressing plate 11 to facilitate the removal of the assembly 21 after the multi-layer tab 212 is welded to the adapter 213. In one embodiment, after preparing the adapter 213, the multi-layer tab 212, the press-fitting work, and the laser welding device 30, the laser welding device 30 can be adjusted so that the laser welding device 30 can be positioned at the laser through hole 121. In another embodiment, the position of the laser welding device 30 relative to the multi-layer tab 212 can also be adjusted before the laser welding device 30 emits the laser 31 toward the multi-layer tab 212. The laser welding device 30 can be positioned at the laser through hole 121 provided on the second pressing plate 12, and the second pressing plate 12 moves along the path direction of the laser 31 emitted by the laser 31. After the multi-layer tab 212 and the adapter 213 are removed, the laser welding device 30 does not need to be adjusted again for the multi-layer tab 212 newly placed in the press-fitting tool 10. After the second pressing plate 12 is pressed onto the multi-layer tab 212, the laser welding device 30 can directly start emitting the laser 31 to weld the multi-layer tab 212 and the adapter 213. The press-fitting tool 10 is configured to be able to move along the path direction of the laser 31, which can facilitate the placement or removal of the adapter 213 and the multi-layer tab 212 in the press-fitting tool 10.

[0076] In some embodiments, referring to FIG3 and FIG8 , the adapter 213 has a boss 2131. When the second pressing plate 12 is pressed against the multi-layered tab 212, the boss 2131 can push out the welded portion of the multi-layered tab 212, so that the multi-layered tab 212 is tensioned and fits against the boss 2131, effectively avoiding the occurrence of a cold weld during the welding of the multi-layered tab 212 to the adapter 213. Specifically, the multi-layered tab 212 covers the boss 2131. When the second pressing plate 12 presses the multi-layered tab 212, the multi-layered tab 212 moves toward the direction approaching the first pressing plate 11 under the pressure of the second pressing plate 12. At this time, the provision of the boss 2131 is equivalent to applying a tensioning pre-pressure to the portion of the multi-layered tab 212 to be welded, while the other portions of the multi-layered tab 212 continue to move toward the direction approaching the first pressing plate 11 as the second pressing plate 12 moves. This allows the multi-layer pole tabs 212 covering the surface of the boss 2131 to be gradually tightened as the second pressure plate 12 moves, so that the multi-layer pole tabs 212 of the welding part can fit tightly together to avoid cold welding. At the same time, it can also make the multi-layer pole tabs 212 fit tightly to the boss 2131, thereby improving welding reliability.

[0077] In some embodiments, as shown in FIG8 , the side of the boss 2131 facing the multi-layer tab 212 has a welding plane, and the welding portion of the multi-layer tab 212 is also configured as a plane. When the second pressing plate 12 is pressed against the multi-layer tab 212, the welding portion of the multi-layer tab 212 covers the welding plane. Configuring the welding portion of the multi-layer tab 212 as a plane has the following advantages:

[0078] Easier to control: When welding the multi-layer tabs 212 , the energy distribution of the laser beam 31 is easier to control and adjust, thereby ensuring the consistency of welding between the multi-layer tabs 212 and the adapter 213 .

[0079] More efficient: The welding points of the multi-layer tabs 212 and the adapter plate 213 are both set as planes. During the welding process, the laser beam 31 can scan the entire plane area more quickly because the shape and size of the plane are relatively small. Therefore, it can ensure that the welding efficiency of the multi-layer tabs 212 and the adapter plate 213 is higher.

[0080] More stable: The welding point of the multi-layer tab 212 and the adapter 213 is configured as a plane with a relatively simple shape. The thermal deformation and stress generated during the welding process are small, making the welding process more stable.

[0081] Lower cost: Since the process of planar welding is relatively simple and requires fewer equipment and process parameters, the overall manufacturing cost of the laser welding device 30 can be reduced.

[0082] In some embodiments, referring to FIG. 4 , the second pressing plate 12 has a laser through-hole 121. The laser through-hole 121 is configured to expose the portion of the multi-layered tab 212 to be welded. The laser light 31 emitted by the laser welding device 30 can be irradiated onto the welded portion of the multi-layered tab 212 through the laser through-hole 121. In one embodiment, to facilitate accurate application of the laser light 31 emitted by the laser welding device 30 to the welded portion of the multi-layered tab 212, the size of the opening of the laser through-hole 121 at the end facing away from the multi-layered tab 212 is larger than the size of the opening of the laser through-hole 121 at the end facing toward the multi-layered tab 212. That is, along the direction from the multi-layered tab 212 to the second pressing plate 12, the size of the opening of the laser through-hole 121 at the end facing away from the multi-layered tab 212 gradually increases, i.e., the inner wall of the opening at this end has an inclined angle, and the cross-section of the opening is tapered. In addition to improving the positioning accuracy of the laser 31 irradiating the multi-layer tab 212, this design also helps expose the welded portion of the multi-layer tab 212, which has the advantage of increasing the amount of light used for automatic visual inspection (automatic visual positioning inspection when the laser welding device 30 is positioned at the laser through-hole 121, and automatic visual inspection of the weld after the multi-layer tab 212 and the adapter 213 are welded). In addition, the tapered opening design can also play a role in heat dissipation and slag removal during the welding process, which is beneficial to improving welding quality.

[0083] In some embodiments, referring to Figures 3 and 8 , the edge of the boss 2131 has an upper surface 2132, and the second pressing plate 12 includes a pressing head 122, which is disposed around the laser through-hole 121. During the pressing of the second pressing plate 12 onto the multi-layer tab 212, the trajectory of the contact point of the pressing head 122 with the multi-layer tab 212 matches the shape of the upper surface 2132. When the multi-layer tab 212 is subjected to pressure from the second pressing plate 12, the overall shape of the multi-layer tab 212 changes, and the deformed shape of the multi-layer tab 212 is the same as the shape of the boss 2131. This allows the multi-layer tab 212 to be tensioned and adhered to the boss 2131 with a higher degree of adherence. The configuration of the edge of the boss 2131 as the upper surface 2132 reduces hard transitions and prevents stress concentration at the edge of the boss 2131 during the downward pressing of the pressing head 122, which could damage the multi-layer tab 212. The following definition of “the deformed shape of the multilayer tab 212 is the same as the shape of the boss 2131” is as follows: if the deformed multilayer tab 212 is similar to the contour shape of the top surface of the boss 2131, or if the distance between the deformed multilayer tab 212 and the boss 2131 at different positions in the normal direction of the boss 2131 is approximately relative to each other, then the deformed shape of the multilayer tab 212 is considered to be the same as the shape of the boss 2131.

[0084] Specifically, referring to FIG3 , the end of the press head 122 near the multi-layer tab 212 can be configured to have an arc-shaped structure. The contact surface between the press head 122 and the multi-layer tab 212 (soldering member 214) is an arc surface. During the process of pressing the second pressing plate 12 against the first pressing plate 11, the press head 122 and the multi-layer tab 212 are in sliding contact. That is, as the press head 122 moves toward the first pressing plate 11, the surface of the press head 122 and the upper surface 2132 of the boss 2131 of the adapter plate 213 fit together, and the contact area between the multi-layer tab 212 and the adapter plate 213 gradually increases to achieve surface-to-surface contact, thereby increasing the pressing area of ​​the multi-layer tab 212 and ensuring stability during the welding process. The contact point between the press head 122 and the multi-layer tab 212 moves along a shape similar to the upper surface 2132 of the boss 2131 as the press head 122 is pressed downward. The arc-shaped structure of the pressing head 122 can prevent the multi-layered tab 212 from being scratched during the pressing process. In addition, during the pressing process, the arc-shaped structure can push the multi-layered tab 212 downward, thereby tightening the multi-layered tab 212.

[0085] Specifically, the multi-layer tab 212 is placed on the adapter 213 and covers the boss 2131. At this time, the multi-layer tab 212 is in a relaxed state. When the pressure head 122 contacts the surface of the multi-layer tab 212 (or the soldering member 214) and moves with the second pressure plate 12 toward the first pressure plate 11, the pressure head 122 applies a force from the second pressure plate 12 to the first pressure plate 11 on the part of the multi-layer tab 212 near the edge of the boss 2131, and the boss 2131 generates a force from the first pressure plate 11 to the second pressure plate 12 on the multi-layer tab 212 located at its edge. This enables the part of the multi-layer tab 212 located on the boss 2131 to gradually tighten with the movement of the pressure head 122, so that the welding parts of the multi-layer tab 212 can fit tightly together, and the welding parts of the multi-layer tab 212 can fit tightly with the boss 2131. That is, the multi-layer tab 212 can generate tension under the interaction between the pressure head 122 and the boss 2131 with the arc slope, so that the multi-layer tab 212 can fit together more fully, and the multi-layer tab 212 and the adapter 213 can fit fully, so as to improve the welding quality and avoid the phenomenon of cold welding.

[0086] In some embodiments, an arc slope is provided on the top surface of the boss 2131 and the side surface of the boss 2131, and the bottom of the boss 2131 may also have an arc transition. For ease of description, the arc at the top of the boss 2131 is referred to as the first arc, and the arc at the bottom of the boss 2131 is referred to as the second arc. The maximum radius of the arc structure of the press head 122 may be smaller than the minimum radius of the second arc. In the process of the press head 122 pressing down with the second pressing plate 12, in the process of the press head 122 moving along the surface shape of the boss 2131, the contact between the press head 122 and the multi-layer tab 212 is line contact. When the second pressing plate 12 stops pressing down, since the radius of the press head 122 is smaller than the radius of the arc at one end of the boss 2131 away from the multi-layer tab 212, the contact between the press head 122 and the multi-layer tab 212 is surface contact. At this time, the area of ​​the multi-layer tab 212 pressed on the adapter plate 213 can be increased, the pressing effect can be enhanced, and the multi-layer tab 212 and the adapter plate 213 can be kept in a close contact state. The multi-layer tab 212 and the adapter plate 213 are welded while being pressed by the pressure head 122, avoiding cold welding and ensuring the welding quality.

[0087] In other embodiments, the arc slope is provided on the top surface of the boss 2131 and the side surface of the boss 2131, and the bottom of the boss 2131 may also have an arc transition. For ease of description, the arc at the top of the boss 2131 is referred to as the first arc, and the arc at the bottom of the boss 2131 is referred to as the second arc. The minimum radius of the arc structure of the pressure head 122 may be greater than the maximum radius of the second arc. In the process of the pressure head 122 pressing down with the second pressing plate 12, in the process of the pressure head 122 moving along the surface shape of the boss 2131, the contact between the pressure head 122 and the multi-layer tab 212 is a line contact. When the second pressing plate 12 stops pressing down, the contact between the pressure head 122 and the multi-layer tab 212 is converted into multiple line contacts.

[0088] In some embodiments, the press head 122 includes a curved portion and a non-curved portion. The curved portion is located near the boss 2131, while the non-curved portion is located away from the boss 2131. The curved portion is used to contact the multi-layer tab 212 during the downward pressing process of the press head 122, causing the multi-layer tab 212 to deform along the contour of the boss 2131. After the downward pressing is completed, the curved portion and the non-curved portion simultaneously cover the multi-layer tab 212, thereby preventing stress concentration from damaging the multi-layer tab 212.

[0089] In some embodiments, referring to FIG. 9 , the extending direction of the pressing head 122 is perpendicular to the direction from the second pressing plate 12 to the first pressing plate 11 .

[0090] In some embodiments, as the press head 122 follows the second pressing plate 12 to press the multi-layer tab 212, the press head 122 may simply descend in a straight line, and the curved surface of the press head 122 may adaptively change its contact position with the multi-layer tab 212. In other embodiments, the press head 122 is controlled by a driving mechanism and moves along the upper surface 2132 of the boss 2131, and its movement trajectory may be a curve.

[0091] In some embodiments, before the second pressing plate 12 is pressed onto the multi-layer tab 212, the laser welding method for the battery cell 211 and the multi-layer tab 212 further includes the step of placing a flux 214 on the side of the multi-layer tab 212 facing away from the adapter 213. The provision of the flux 214 has the following advantages for this method:

[0092] The soldering member 214 can increase the wettability of the surface of the welding portion of the multi-layer tab 212, so that the molten solder can be better attached to the surface of the welding portion of the multi-layer tab 212, thereby improving the welding quality.

[0093] Prevent oxidation: The flux 214 can isolate the air, prevent the welding surface from oxidation, keep the welding surface clean, and help improve the reliability and strength of welding.

[0094] Enhanced conductivity: The soldering member 214 is conductive and can enhance the conductive performance of the welding portion of the multi-layer tab 212, which is beneficial to the conduction of current.

[0095] Heat dissipation: During the laser 31 welding process, the flux 214 can help dissipate heat, reduce heat accumulation, and prevent the multi-layer tab 212 or the adapter 213 from being deformed due to overheating.

[0096] Enhanced bonding strength: The provision of the fluxing member 214 can enhance the bonding strength between the multi-layer tab 212 and the adapter 213 and improve the welding strength.

[0097] Protective function: The soldering member 214 is arranged on the surface of the multi-layer tab 212 to prevent the second pressing plate 12 from causing indentations or scratches on the surface of the multi-layer tab 212 during the process of pressing the second pressing plate 12 onto the first pressing plate 11 .

[0098] In some embodiments, referring to Figures 6 and 7, the battery 20 includes a top cover 22. Before the adapter 213 is placed on the first pressing plate 11, or before the multi-layered tabs 212 and adapter 213 are prepared for welding, the laser welding method for the multi-layered tabs 212 of the battery cell 211 further includes the following steps: connecting the adapter 213 to the top cover 22. After the multi-layered tabs 212 and adapter 213 are prepared for welding, the top cover 22 is placed on the first pressing plate 11, with the side of the top cover 22 facing away from the adapter 213 in contact with the first pressing plate 11. Connecting the adapter 213 to the top cover 22 before welding the multi-layered tabs 212 and adapter 213 can prevent the adapter 213, which has been welded to the multi-layered tab 212, from being damaged or destroyed during the connection operation between the multi-layered tabs 212 and the adapter 213 during the process of being connected to the top cover 22.

[0099] In some embodiments, referring to FIG5 , the first pressing plate 11 is provided with a first positioning portion 111. After the multi-layer tabs 212 and the adapter 213 to be welded are prepared, the laser welding method for the multi-layer tabs 212 of the battery cell 211 further includes the step of positioning the top cover 22 on the first positioning portion 111. The placement position of the adapter 213 relative to the first pressing plate 11 can be determined by the position of the top cover 22 relative to the first positioning portion 111. In the case where the overall size of the adapter 213 is relatively small, this arrangement can improve the positioning accuracy of the adapter 213 and simplify the positioning operation of the adapter 213.

[0100] In some embodiments, referring to FIG5 , the second pressing plate 12 is provided with a second positioning portion 112 , the multi-layer tab 212 is connected to the battery cell 211 , and after the adapter 213 is placed on the first pressing plate 11 , the laser welding method of the multi-layer tab 212 of the battery cell 211 further includes the following steps: positioning the battery cell 211 at the second positioning portion 112 . Due to the special structure of the multi-layer tab 212 (composed of multiple layers of tabs overlapping and bonded to each other), in order to ensure the stability of the multi-layer tab 212 relative to the press-fitting tool 10 during the welding process, the multi-layer tab 212 is positioned by positioning the battery cell 211 , which can reduce the difficulty of positioning the multi-layer tab 212 and facilitate improving welding efficiency.

[0101] In some embodiments, the press-fitting tool 10 further includes a driver capable of driving the second press plate 12 toward (or away from) the first press plate 11 so that the second press plate 12 can be tightly pressed against the first press plate 11 (or the second press plate 12 can be separated from the first press plate 11 to facilitate removal of the multi-layered tab 212 and adapter 213 after welding). The driver can be a threaded assembly, a gas (liquid) cylinder, or the like.

[0102] Referring to Figures 11, 12, and 13, in one embodiment of the present application, the press-fitting tool 10 includes a first pressing plate 11 and a second pressing plate 12. The first pressing plate 11 can be raised and lowered relative to the second pressing plate 12. The first pressing plate 11 is provided with a battery cover placement position K1. In some embodiments, the shape of the battery cover placement position K1 can be configured according to the shape of the battery cover. The battery cover placement position K1 can be configured as a groove. The first pressing plate 11 can be used to secure the battery cover (not shown). The battery cover can be secured in the groove of the first pressing plate 11 by embedding or snapping. The battery cover placement position K1 can be of various forms, as long as it can constrain the battery cover to a fixed position on the first pressing plate 11. For example, the first pressing plate 11 can be provided with a plurality of positioning posts to position a battery cover of a predetermined size in a fixed area on the first pressing plate 11. In this case, the area enclosed by the positioning posts can be considered the battery cover placement position K1. After the battery cover is placed in the placement position, the adapter 213 fixed to the battery cover faces the second pressing plate 12. The adapter 213 includes a base 2101 and a boss 2131. The base 2101 is connected to the battery cover. The side of the base 2101 closest to the first pressure plate 11 is flat, while the boss 2131 is located on the side of the base 2101 closest to the first pressure plate 11. The width of the boss 2131 gradually decreases in a direction P1 away from the base 2101. In some embodiments, both sides of the boss 2131 are configured as curved surfaces; alternatively, both sides of the boss 2131 are configured as inclined surfaces; one side of the boss 2131 is configured as a curved surface, and the other side of the boss 2131 is configured as an inclined surface. In some embodiments, the upper surface 221 of the boss 2131 is flat or curved, and the opposite edges 222 are curved or inclined surfaces that connect to the upper surface 221. For example, the upper surface 221 of the boss 2131 is a plane, and the opposite side edges 222 in the width direction are arc surfaces; or, the upper surface 221 of the boss 2131 is a plane, and the opposite side edges 222 in the width direction are inclined surfaces; or, the upper surface 221 of the boss 2131 is a plane, and the opposite side edges in the width direction are inclined surfaces with two different inclination angles; or, the upper surface 221 of the boss 2131 and the opposite side edges 222 are both arc surfaces, and the curvature radius of the arc surface area can be the same or different.

[0103] In one embodiment of the present application, the first pressing plate 11 is provided with a cell placement position K2, which can be used to place a cell (not shown). The cell placement position K2 can be configured as a groove, and the cell can be fixed in the groove of the cell placement position K2 by embedding or snapping. The tab 212 is fixed to the cell, and the tab 212 connects the cell to the adapter 213. The tab 212 is located on the side of the adapter 213 close to the pressure head 122, such as resting on the upper surface 221 of the boss 2131 and extending over the opposite side edges 222 of the boss 2131.

[0104] The second pressure plate 12 includes a main body 1201 and a pressing head 122. The pressing head 122 is fixed to the main body 1201 and extends from the main body 1201 toward the battery cover placement position K1. The pressing head 122 has a pressing surface 1220 on the side closest to the battery cover placement position K1. The pressing surface 1220 is an arc or inclined surface. In some embodiments, two pressing heads 122 are provided, and the two pressing heads 122 are spaced apart. When the pressing surfaces 1220 press the tab 212 onto the adapter plate 213, the two pressing heads 122 respectively press on both sides of the boss 2131. The second pressure plate 12 can be raised and lowered relative to the first pressure plate 11, enabling the second pressure plate 12 to move up and down. The pressing head moves up and down under the drive of the lifting device, driving the pressing surface 1220 to press the tab 212 onto the boss 2131 of the adapter plate 213, thereby tightening the battery tab 212. The main body 1201 can be securely mounted on the first pressure plate 11 by fasteners such as bolts, thereby preventing the pressure head 122 from shaking during the movement of the lifting device and affecting the accuracy of the battery tab press-fitting. In one embodiment, the width of the portion of the pressure head 122 extending toward the battery top cover placement position K1 is the same, and the extended end closest to the battery top cover placement position K1 is narrowed to an arc surface or an inclined surface to serve as a pressing surface 1220. In some embodiments, the lifting device can be a common pneumatic lifting device, a motor-driven lifting device, or a manually adjustable lifting device. The lifting device can achieve directional lifting and lowering movement of the second pressure plate 12, and the lifting device can also be regarded as a guide member 14. In some embodiments, the main body 1201 of the lifting device is manually adjusted so that the main body 1201 moves up and down along the extension direction of the linear bearing 142. When the main body 1201 moves to the pressing position, that is, the pressing head 122 is able to contact the multi-layered tab 212 to be pressed to facilitate pressing the multi-layered tab 212, the main body is compressed by the cylinder to achieve the fixed position of the main body 1201 during pressing. In some embodiments, when the main body 1201 moves to the pressing position, a plurality of screws 141 can be provided on the main body 1201. The screws 141 are provided on the main body 1201, and the main body 1201 can be fixed by turning the knobs of the screws 141.

[0105] The pressing surface 1220 corresponds to the side edge of the boss 2131 in the lifting direction, for example, at least partially facing the side edge of the boss 2131 in the lifting direction. The pressing surface 1220 should have the same shape as the corresponding side edge of the boss 2131, for example, both are curved or both are inclined, or one is inclined and the other is curved. The second pressure plate 12 can be raised and lowered relative to the first pressure plate 11 to directly act on the tab 212 or the soldering sheet (not shown) located above the tab 212, thereby pressing the tab 212 against the adapter plate 213. This structure can firmly press the battery tab 212 against the adapter plate 213. In particular, for the adapter plate 213 having an edge of a boss 2131 with an arc or inclined surface, after the pressing surface 1220 presses against the edge of the boss 2131 of the adapter plate 213, the pole ear 212 located above the boss 2131 will be tensioned, effectively improving the fit between the battery pole ear 212 and the adapter plate 213, thereby improving the welding efficiency and welding quality.

[0106] Referring to FIG. 12 , in one embodiment of the present application, the width of the pressing head 122 gradually decreases in the direction approaching the battery top cover placement position K1, and a pressing surface 1220 having an arc or inclined surface is formed at the position closest to the battery top cover placement position K1. As the pressing head 122 descends, when the pressing head 122 contacts the battery tab 212 above the adapter plate 213, the arc-shaped pressing piece and the first pressing plate 11 slide in contact. The use of the above-mentioned arc-shaped or wedge-shaped pressing surface 1220 can prevent the pressing head 122 from cutting the battery tab 212 when contacting the battery tab 212. The arc-shaped pressing surface 1220 can enable the pressing head 122 to slide in contact with the battery tab 212, which is conducive to better protecting the battery tab 212, effectively preventing the tab 212 from breaking, and improving the efficiency of the battery tab press-fitting.

[0107] Referring to FIG. 13 , in one embodiment of the present application, the pressing head 122 includes a first pressing head 1221 and a second pressing head 1222. The first pressing head 1221 and the second pressing head 1222 are spaced apart to form a first spacing space 1223 therebetween. The corner edge of the first pressing head 1221 near the second pressing head 1222 and the corner edge of the second pressing head 1222 near the first pressing head 1221 both serve as the aforementioned pressing surface 1220. The corner edge is the arcuate surface or inclined surface of the portion of the first pressing head 1221 near the contact between the second pressing head 1222 and the boss 2131, and the arcuate surface or inclined surface of the portion of the second pressing head 1222 near the contact between the first pressing head 1221 and the boss 2131. When the press-fitting tool 10 is in operation, the first spacing space 1223 faces the boss 2131 of the adapter plate 213 in the lifting direction. Correspondingly, the directions of the opposite side edges 222 of the boss 2131 of the adapter plate 213 are the same as the spacing between the first pressing head 1221 and the second pressing head 1222. The pressing surface 1220 on the first pressing head 1221 faces one side edge of the boss 2131 in the lifting direction, while the pressing surface 1220 on the second pressing head 1222 faces the other side edge of the boss 2131 in the lifting direction. The aforementioned side edges 222 of the boss 2131 are inclined or curved surfaces. The distance between the pressing surfaces 1220 on the first pressing head 1221 and the second pressing head 1222 is equal to or slightly greater than the distance between the opposite side edges 222 of the boss 2131. When the main body 1201 moves downward, the first pressure head 1221 and the second pressure head 1222 move downward synchronously. After the pressing surfaces 1220 of the two contact the battery tab 212, they continue to press downward, so that the battery tab 212 is pressed to the position between the opposite side edges 222 of the boss 2131. The multi-layer tab 212 placed on the boss 2131 of the adapter plate 213 is tensioned under the action of the pressing surface 1220, so as to achieve the compression of the multi-layer tab 212 on the boss 2131.

[0108] In one embodiment of the present application, the main body 1201 is provided with a laser through-hole 121, which is directly opposite and connected to the first spacing space 1223. The press-fitting tool 10 further includes a laser welding device 30, which is located above the laser through-hole 121. The laser welding device 30 is configured such that the laser light 31 emitted by the laser welding device 30 can sequentially pass through the laser through-hole 121 and the first spacing space 1223. The laser welding device 30 can emit a welding laser, which sequentially passes through the laser through-hole 121 and the first spacing space 1223 and irradiates the multi-layered tab 212 on the boss 2131. The press-fitted multi-layered tab 212 is welded together under the action of the laser light 31, achieving precise press-fitting of the multi-layered tab 212 without pre-welding, ensuring a seamless fit between the multi-layered tab 212 and the adapter 213, and improving battery production efficiency.

[0109] In one embodiment of the present application, the first pressing plate 11 is connected to the main body 1201 via a guide 14. The guide 14 is used to control the second pressing plate 12 to rise and fall along a fixed direction relative to the first pressing plate 11. The second pressing plate 12 can rise and fall along the direction of the guide 14, thereby controlling the distance between the second pressing plate 12 and the battery tab 212.

[0110] In one embodiment of the present application, the guide member 14 includes a linear bearing 142 mounted on the main body 1201 of the second pressure plate 12. The linear bearing 142 serves as a positioning mechanism during the press-fitting process, ensuring precision when the second pressure plate 12 is pressed up and down. In some embodiments, a screw 141 is mounted on the main body 1201 to secure the main body 1201, ensuring that the main body 1201 remains stable during press-fitting of the battery tab 212. To control the raising and lowering of the second pressure plate 12, the screw 141 can be rotated to secure the main body 1201.

[0111] In one embodiment of the present application, the cylinder drive device is connected to the main body 1201 and / or the first pressure plate 11, and the guide member 14 can adopt an automated power mechanism such as a motor, a hydraulic cylinder, a cylinder, etc., to conveniently realize the movement of the main body 1201 along the direction of the guide member 14.

[0112] 14 to 18 , in one embodiment of the present application, the press-fitting tool 10 includes a first pressing plate 11, a second pressing plate 12, and a locking mechanism 3. The first pressing plate 11 has a first positioning portion 111 for placing and positioning the adapter plate 213. The first pressing plate 11 also provides a place for the battery cell 211, and the multi-layer tabs 212 of the battery cell 211 abut against the adapter plate 213.

[0113] The second pressing plate 12 is used to absorb the soldering element 214 and press the soldering element 214 against the side of the multi-layer tab 212 facing away from the adapter 213. The second pressing plate 12 is provided with a laser through-hole 121. The soldering element 214 is at least partially exposed through the laser through-hole 121. The laser through-hole 121 allows the laser beam to pass through to weld the multi-layer tab 212 and the adapter 213. The locking mechanism 3 is used to lock and fix the second pressing plate and the first pressing plate 11 so that the multi-layer tab 212 and the multi-layer tab 212 and the adapter 213 are tightly attached to each other.

[0114] Based on the above-mentioned scheme, the multi-layer pole ears 212 and the adapter plate 213 are jointly pressed by the first pressure plate 11 and the second pressure plate 12, and the first pressure plate 11 and the second pressure plate 12 are locked and fixed by the locking mechanism 3, so that the multi-layer pole ears 212 and the multi-layer pole ears 212 and the adapter plate 213 are tightly fitted together. Such a setting can not only improve the fit and tightness between the multi-layer pole ears 212 and the adapter plate 213 and between the multi-layer pole ears 212, thereby greatly improving the welding efficiency and welding quality of the lithium battery, but also can eliminate the ultrasonic welding process, saving a process in the production process of the lithium battery, greatly improving the time cost and process cost of lithium battery production, and greatly improving the production efficiency and quality of the lithium battery.

[0115] In addition, the position of the adapter plate 213 is limited by the first positioning portion 111, which effectively prevents the adapter plate 213 from being offset in position, so that the adapter plate 213 and the multi-layer pole ear 212 can fit tightly together, effectively preventing gaps between the multi-layer pole ears 212 and between the multi-layer pole ears 212 and the adapter plate 213, thereby improving the fit between the multi-layer pole ears 212 and between the multi-layer pole ears 212 and the adapter plate 213, so as to improve the welding quality during the welding process and improve the production quality of lithium batteries.

[0116] Among them, the first pressure plate 11 can also be provided with a second positioning portion 112, and the second positioning portion 112 is used to place the battery cell 211 and to limit the battery cell 211, so as to effectively avoid the battery cell 211 from causing position displacement during the pressing process, so as to effectively prevent the battery cell 211 from driving the multi-layer pole ear 212 to move, and avoid the fixed position of the multi-layer pole ear 212 from being affected, so as to improve the pressing stability between the multi-layer pole ear 212 and between the multi-layer pole ear 212 and the adapter plate 213, thereby improving the fit between the multi-layer pole ear 212 and between the multi-layer pole ear 212 and the adapter plate 213.

[0117] Continuing with reference to Figures 14 to 18, the locking mechanism 3 includes a plurality of fasteners 31, which are arranged around the laser through-hole 121. The plurality of fasteners 31 are used to lock or release the first pressure plate 11 and the second pressure plate 12. This arrangement can stably lock and fix the first pressure plate 11 and the second pressure plate 12. On the one hand, it can well ensure the tightness between the multi-layer tabs 212 and the adapter plate 213, effectively preventing gaps between the multi-layer tabs 212 and between the multi-layer tabs 212 and the adapter plate 213. On the other hand, it can effectively prevent the multi-layer tabs 212 and the adapter plate 213 from loosening, thereby improving the welding quality between the multi-layer tabs 212 and the adapter plate 213 during the welding process.

[0118] The first pressure plate 11 may include a fixed base plate 13, and the first positioning portion 111 and the second positioning portion 112 are both formed on the fixed plate. The second pressure plate 12 may include a mounting member 2301, and the fixed base plate 13 and the mounting member 2301 cooperate with each other to jointly press the multi-layer tab 212 and the adapter plate 213. The fixed base plate 13 may be provided with a plurality of first threaded holes, and correspondingly, the mounting member 2301 is penetrated by a plurality of second threaded holes, and the plurality of first threaded holes are arranged in a one-to-one correspondence with the plurality of second threaded holes. One end of a plurality of fasteners 31 passes through the corresponding second threaded holes and is threadedly engaged with the corresponding first threaded holes. The fasteners 31 are used to lock and fix the fixed base plate 13 and the mounting member 2301 to achieve a firm compression of the multi-layer tab 212 and the adapter plate 213, so that the multi-layer tab 212 and the adapter plate 213 can be tightly fitted together.

[0119] Specifically, the fastener 31 can be a fastening bolt or a fastening pin. The fastener 31 can also be other structural parts with locking and fixing functions, as long as it can firmly lock and fix the second pressure plate 12 and the first pressure plate 11. They are not listed here one by one.

[0120] Continuing with reference to Figures 14 to 18, the first pressing plate 11 includes a first guide member 1401, and the second pressing plate 12 includes a second guide member 2201. The first guide member 1401 and the second guide member 2201 are positioned and guided together. This arrangement not only enables the first pressing plate 11 and the second pressing plate 12 to be guided and pressed together, effectively preventing positional offset when the second pressing plate 12 presses the multi-layered tab 212 and the adapter 213, but also improves the smoothness of the cooperation between the first pressing plate 11 and the second pressing plate 12 when pressing the multi-layered tab 212 and the adapter 213, which can greatly save installation time and help improve production efficiency.

[0121] Among them, the number of the first guide members 1401 and the second guide members 2201 can be set in multiple, and the multiple first guide members 1401 and the multiple second guide members 2201 correspond to each other one by one, which further improves the smoothness of the cooperation between the first pressure plate 11 and the second pressure plate 12, so as to better shorten the installation time.

[0122] Specifically, the first guide member 1401 can be a positioning guide column, one end of which is fixed on the fixed base plate 13, and the positioning guide column can be integrally formed with the fixed base plate 13. The second guide member 2201 can be a guide cylinder, which is installed on the mounting member 2301, and the positioning guide column and the guide cylinder are guided in cooperation.

[0123] It is understandable that the first guide member 1401 may also be a guide cylinder, and the second guide member 2201 may be a positioning guide column.

[0124] 14 and 19 to 24 , the second pressure plate 12 includes a mounting member 2301 and an adsorption assembly 24 . The laser through hole 121 is formed on the mounting member 2301 . The adsorption assembly 24 is connected to the mounting member 2301 . The adsorption assembly 24 is arranged around the laser through hole 121 . The adsorption assembly 24 is provided with at least two rows of adsorption ports 2411 . The adsorption assembly 24 is used to adsorb, fix, or release the soldering iron 214 through at least two rows of adsorption ports 2411 .

[0125] Such arrangement enables the adsorption and fixing of the soldering iron 214 by the adsorption component 24, so as to realize the loading of the soldering iron 214 and press the soldering iron 214 against the multi-layer pole tab 212. The laser beam passes through the laser through-hole 121 to realize the laser welding of the multi-layer pole tab 212 and the adapter 213, so as to realize the welding of the multi-layer pole tab 212 and the adapter 213 together without pre-welding, thereby greatly saving the ultrasonic welding process, saving a process in the production process of lithium batteries, greatly improving the time cost and process cost of lithium battery production, and greatly improving the production efficiency and quality of lithium batteries.

[0126] The mounting member 2301 is provided for mounting the adsorption assembly 24, so that the mounting member 2301 carries the adsorption assembly 24 with it during movement, thereby cooperating with the fixed base plate 13 to press the multi-layered tab 212 and the adapter plate 213. The adsorption assembly 24 adsorbs and fixes the soldering element 214 through at least two rows of adsorption ports 2411, thereby enabling the soldering element 214 to be stably pressed against the multi-layered tab 212, thereby improving welding quality and enhancing the production quality of lithium batteries.

[0127] The mounting member 2301 may be a mounting plate or other structural member for mounting the adsorption assembly 24 , which is not specifically limited here.

[0128] The laser through hole 121 can be arranged in a long strip shape, a circular shape, or any other shape, as long as it can adapt to the production requirements of laser welding.

[0129] Continuing with reference to Figures 14 and 19 to 24, the adsorption assembly 24 includes two adsorption members 241 and two vacuum connectors 242. The two adsorption members 241 are connected to the mounting member 2301 and are spaced apart. One of at least two rows of adsorption ports 2411 is formed on a corresponding adsorption member 241. Both adsorption members 241 are provided with an airflow channel 2412 that communicates with the corresponding row of adsorption ports 2411. The two vacuum connectors 242 are connected to the mounting member 2301. One end of each vacuum connector 242 is in air communication with the corresponding airflow channel 2412, and the other end is in air communication with an external air system.

[0130] Based on the above-mentioned scheme, the soldering iron 214 is fixed by adsorption. This not only can ensure the adsorption and fixing force of the soldering iron 214, making the soldering iron 214 not easy to fall off, thereby ensuring the rhythm and smoothness of production, but also can simplify the structure, simplifying the structure of the adsorption component 24, and helping to reduce the structural cost.

[0131] The number of adsorption ports 2411 can be set to four rows, and two rows of the four rows of adsorption ports 2411 are set on the corresponding adsorption parts 241. The number of adsorption ports 2411 can also be set to multiple rows. In the present application, the number of adsorption ports 2411 is explained by taking two rows as an example. This is only an example and does not limit the number of adsorption ports 2411.

[0132] Each row of suction ports 2411 is spaced apart along the length of the suction member 241 to ensure uniform suction of the soldering member 214 and increase the stability of the soldering member 214. The two rows of suction ports 2411 can enhance the suction force of the soldering member 214, improve the performance of the soldering member 214, and thus improve the stability of the soldering member 214 when loading.

[0133] Continuing with Figures 14, 19, and 24, the two adsorbents 241 are each formed with a pressing portion 2413 on opposite sides thereof. The pressing portion 2413 is arranged in an arc shape. Since the edge of the adapter plate 213 is arranged in an arc slope shape, in order for the multi-layer tab 212 to be fully and tightly fitted with the adapter plate 213, the pressing end of the adsorbent 241 needs to have good adaptability to the edge of the battery top cover.

[0134] By means of the arc-shaped pressing portion 2413, the edges of the multi-layer pole ear 212 and the adapter plate 213 can be tightly fitted together during the process of pressing the multi-layer pole ear 212 and the adapter plate 213, so that the edges of the multi-layer pole ear 212 and the adapter plate 213 are fully in contact, effectively preventing the presence of a gap between the multi-layer pole ear 212 and the adapter plate 213, thereby improving the welding quality of the multi-layer pole ear 212 and the adapter plate 213.

[0135] Continuing with reference to Figures 14 and 19 to 24, the adsorption member 241 includes a crimping body 2414, which has a mounting portion 24141 and a holding portion 24142. The mounting portion 24141 is fixedly connected to the mounting member 2301, and the holding portion 24142 is connected to the mounting portion 24141 and is disposed at an angle to the mounting portion 24141. The holding portion 24142 is disposed perpendicularly to the mounting portion 24141.

[0136] With such arrangement, on the one hand, the pressing portion 24142 is used to adsorb and fix the soldering member 214, and the soldering member 214 is pressed against the multi-layer pole tab 212, so as to facilitate the laser beam to pass through the soldering member 214 to perform laser welding on the multi-layer pole tab 212 and the adapter plate 213. On the other hand, the pressing portion 24142 is used to press the multi-layer pole tab 212 and the adapter plate 213, so as to enable the multi-layer pole tab 212 and the adapter plate 213 to be tightly fitted together, so as to effectively eliminate the gaps between the multi-layer pole tabs 212 and between the multi-layer pole tabs 212 and the adapter plate 213, thereby improving the tightness between the multi-layer pole tabs 212 and between the multi-layer pole tabs 212 and the adapter plate 213.

[0137] The holding portion 24142 and the mounting portion 24141 may be integrally formed, and the mounting portion 24141 may be fixed to the mounting piece 2301 by welding.

[0138] Continuing with reference to Figures 14 and 19 to 24, the adsorption member 241 further includes a sealing body 2415. The pressing portion 24142 is provided with an airflow groove 24143, and each row of adsorption ports 2411 is connected to the airflow groove 24143. The mounting portion 24141 is provided with airflow holes 24144, and the sealing body 2415 is provided with a sealing groove 24151. The sealing body 2415 is disposed between the pressing portion 24142 and the mounting portion 24141 and is sealedly connected to the pressing portion 24142 and the mounting portion 24141. The sealing body 2415 is used to cooperate with the pressing portion 24142 and the mounting portion 24141 to form an airflow channel 2412.

[0139] The mounting member 2301 is provided with two adsorption holes 2310 , one end of the two adsorption holes 2310 is sealedly connected to the corresponding air flow holes 24144 , and the other end of the two adsorption holes 2310 is air-connected to the corresponding vacuum connector 242 .

[0140] With such a configuration, on the one hand, the structural space of the sealing body 2415, the mounting portion 24141 and the holding portion 24142 can be utilized to form the airflow channel 2412, thereby greatly improving the space utilization rate of the structure. On the other hand, when a problem occurs with the adsorption component 24, it is convenient to replace the sealing body 2415, thereby improving the performance of the pressing tool 10.

[0141] The sealing body 2415 can be a sealing block made of silicone material, or other structural parts with sealing performance, as long as it can be sealed with the installation part 24141 and the holding part 24142 to form the airflow channel 2412, and no specific limitation is made here.

[0142] Continuing with reference to Figures 14 and 19 to 24, the second pressing plate 12 further includes a cleaning assembly 4, which is connected to the mounting member 2301 and arranged along the circumferential direction of the laser through-hole 121. The cleaning assembly 4 is provided with an air blowing port 411 and a dust extraction port 421 that are oppositely disposed. The two adsorption members 241 cooperate to form an extension channel 25 that is connected to the laser through-hole 121. The air blowing port 411 and the dust extraction port 421 are both disposed toward the extension channel 25. The cleaning assembly 4 blows air through the air blowing port 411 and extracts air through the dust extraction port 421 to clean dust generated during the welding process.

[0143] This arrangement allows for timely cleaning of dust generated during welding of the multi-layer tabs 212 and the battery top cover claw adapter plate. This not only ensures the cleanliness of the welding of the multi-layer tabs 212 and the adapter plate 213, but also helps to improve the welding quality of the multi-layer tabs 212 and the adapter plate 213.

[0144] In addition, the air blowing port 411 and the dust extraction port 421 are both arranged toward the extension channel 25 and are arranged opposite to each other, so that air can be blown at one end to blow up dust, and the dust is also confined within the extension channel 25, effectively preventing dust from flying around. This makes it convenient to suck dust through the dust extraction port 421 at the other end to clean the dust generated during the welding process.

[0145] Among them, the gas blown out by the cleaning component 4 through the blowing port 411 can be a protective gas. On the one hand, this can provide protective gas when the laser beam welds the multi-layer pole ear 212 and the adapter plate 213, which helps to improve the quality of welding. On the other hand, the protective gas can also blow away the dust generated during the welding process and clean the dust generated during the welding process in time.

[0146] Continuing with reference to Figures 14 and 19 to 24, the cleaning assembly 4 includes a blowing member 41 and a dust extraction member 42. The blowing member 41 is connected to the mounting member 2301 and is disposed at one end of the two adsorption members 241. The dust extraction member 42 is connected to the mounting member 2301 and is disposed at the other end of the two adsorption members 241. The blowing member 41 is provided with a blowing channel 412. A blowing port 411 is formed at one open end of the blowing channel 412. The other open end of the blowing channel 412 is connected to the external air system via an air injection connector 43. The dust extraction member 42 is provided with a dust extraction channel 422. A dust extraction port 421 is formed at one open end of the dust extraction channel 422. The other open end of the dust extraction channel 422 is connected to the external air system via an air extraction connector 44.

[0147] Mounting member 2301 is penetrated by an air inlet hole 232 and an air outlet hole 233. One end of air inlet hole 232 is in air-tight communication with the air blowing channel 412, and the other end is in air-tight communication with the air injection connector 43. One end of air outlet hole 233 is in air-tight communication with the dust extraction channel 422, and the other end is in air-tight communication with the air extraction connector 44.

[0148] Based on the above-mentioned scheme, the blowing member 41 and the dust extraction member 42 can be used to clean the dust generated by welding in time during the welding process, which helps to improve the quality of welding and also improve the structural compactness of the second pressing plate 12.

[0149] The blowing member 41 may be a blowing block or other structural member having a blowing channel 412 , and is not specifically limited herein as long as it can blow out the protective gas and blow away the dust.

[0150] The dust extraction member 42 may be a suction block or other structural member having a dust extraction channel 422 , and is not specifically limited herein as long as it can achieve dust extraction.

[0151] [Corrected 19.07.2024 according to Rule 91] In one embodiment of the present application, the adapter 213 is used to connect the tab 212 of the battery 20 and the top cover 22. The adapter 213 of this embodiment of the present application is described below with reference to Figures 25 to 33. Specifically, the adapter 213 includes a base 21 and a boss 2131.

[0152] [Corrected 19.07.2024 according to Rule 91] Referring to Figures 25 to 27, the base 21 is used to connect the top cover 22 of the battery 20. Specifically, the base 21 can be connected to the pole of the battery 20. The outer contour of the base 21 can be set to a variety of shapes. In some embodiments, when the base 21 is used for a cylindrical battery 20, the outer contour of the base 21 can be set to a circular shape. In other embodiments, when the base 21 is used for a square battery 20, the outer contour of the base 21 can be set to a square shape. Some embodiments of the present application are described by taking the setting of a square base 21 as an example.

[0153] Referring to Figures 27 and 28 , the boss 2131 is used to weld the tab 212 on the battery cell 211. The specific location of the boss 2131 is described below. The boss 2131 is disposed on a side wall 110 of the base body 21 along its thickness direction Y. It is understood that the boss 2131 can be disposed on a side wall 110 of the base body 21 along the thickness direction Y that faces away from the top cover 22 of the battery cell 20. With reference to the orientation in Figure 27 , when the upper side wall 110 of the base body 21 is used for welding the top cover 22 of the battery cell 20, the boss 2131 can be disposed on the lower side wall 110 of the base body 21.

[0154] In one embodiment of the present application, the boss 2131 can be arranged integrally with the base 21. In other embodiments, the boss 2131 can also be arranged separately from the base 21, that is, the boss 2131 can be formed separately from the base 21 and then connected. Some embodiments of the present application are described using the example of the boss 2131 being arranged integrally with the base 21.

[0155] The boss 2131 is used to press the tab 212 to deform the tab 212, that is, the tab 212 can be pre-tightened before the boss 2131 is welded to the tab 212, thereby omitting the pre-welding process between the two and ensuring the welding quality. It is understood that a press-fitting tool can be used to press the tab 212 against the boss 2131, and the specific structure of the press-fitting tool can be determined according to the actual situation. It should be noted that the boss 2131 can be arranged in a solid shape, that is, it can prevent the boss 2131 from being burned through and separated from the base 21 when welding the boss 2131 to the tab 212, effectively improving the connection strength between the boss 2131 and the base 21.

[0156] In one embodiment of the present application, the adapter plate 213 includes a base 21 and a boss 2131. The boss 2131 is provided on a side wall 110 of the base 21 along its thickness direction Y. The boss 2131 is used to weld the pole tab 212. In the prior art, the overall thickness of the adapter plate is uniform, that is, the adapter plate only includes the base, so the welding surface of the adapter plate is smooth, and in order to ensure the welding quality, the multi-layer pole tabs need to be pre-welded before being welded to the base. In this solution, the adapter plate 213 includes a base 21 and a boss 2131. The boss 2131 can press the pole tab 212 to deform the pole tab 212, that is, the pole tab 212 can be pre-tightened before welding the pole tab 212 and then directly welded. Therefore, this solution can omit the pre-welding operation of the pole tab before welding the pole tab 212 to the adapter plate 213, effectively improving the welding efficiency. Moreover, since the boss 2131 presses the tab 212 , the gap between the tab 212 and the adapter 213 can be effectively reduced, so that the tab 212 fits the adapter 213 , ensuring the welding quality of the tab 212 and improving the yield rate of the molded battery 20 .

[0157] The following describes the relative thickness ratio between the base 21 and the boss 2131. In one embodiment of the present application, along the thickness direction Y, the base 21 has a first thickness H1, and the boss 2131 has a second thickness H2. Among them, H1:H2 is 0.25 to 4. Exemplarily, H1:H2 can be 0.25, 0.6, 0.7, 1.3, 2.2, 3.4 or 4. In this solution, the base 21 and the boss 2131 adopt the above-mentioned thickness ratio. On the one hand, it can ensure the pre-tightening effect of the boss 2131 on the tab 212 and ensure the welding quality. On the other hand, it can also save its raw materials and reduce processing costs.

[0158] The following specifically describes the thickness range of the substrate 21. In one embodiment of the present application, the first thickness H1 is 0.5 mm to 2 mm. For example, the first thickness H1 can be 0.5 mm, 0.75 mm, 1.5 mm, 1.75 mm, 1.9 mm, or 2 mm.

[0159] The following specifically describes the thickness range of the boss 2131. The second thickness H2 is 0.5mm to 3mm. For example, the second thickness H2 can be 0.5mm, 1.0mm, 1.3mm, 1.5mm, 2.0mm, 2.5mm, 2.7mm or 3mm. In this solution, the adapter 213 adopts the above thickness range, which can not only ensure the welding quality between the adapter 213 and the tab 212 and the top cover 22, but also ensure the current transmission effect and improve the quality of the battery 20.

[0160] In order to facilitate the description and understanding of the proportion of the boss 2131 on the base 21 along the thickness direction Y, a projection plane is defined. The plane of the base 21 facing the boss 2131 is set as the projection plane. In some embodiments, along the thickness direction Y, the base 21 forms a first orthographic projection S1 on the projection plane. The boss 2131 forms a second orthographic projection S2 on the projection plane. Among them, S1:S2 is 3 to 6. For example, S1:S2 can be 3, 3.2, 3.5, 3.8, 4, 4.4, 5, 5.2 or 6, etc. In this solution, the boss 2131 of the adapter 213 and the base 21 adopt the above-mentioned ratio range, that is, it can adapt to various specifications and types of battery 20 structures, ensure the welding quality between the various parts, and improve the yield rate of the battery 20.

[0161] The specific size setting of the base 21 is described below. In one embodiment of the present application, the area of ​​the first orthographic projection S1 is 300mm 2 ~810mm 2 For example, the area of ​​the first orthographic projection S1 may be 300 mm 2 , 350mm 2 , 460mm 2 , 600mm 2 , 780mm 2 or 810mm 2 wait.

[0162] The specific size setting of the boss 2131 is described below. Specifically, the area of ​​the second orthographic projection S2 is 60mm 2 ~250mm 2 For example, the area of ​​the second orthographic projection S2 can be 60 mm 2 , 100mm 2 , 145mm 2 , 180mm 2 , 240mm 2or 250mm 2 In this solution, by making the boss 2131 and the base 21 have the above-mentioned size ratio, it can adapt to batteries 20 of various specifications and types, ensure the welding quality between various parts, and improve the yield rate of the battery 20.

[0163] 28 to 33 , in order to facilitate the description and understanding of the thickness dimension setting of the base 21, a first direction X is defined, and the first direction X is perpendicular to the thickness direction Y. With reference to the orientation in FIG28 , the thickness direction Y can be an up and down direction, that is, the first direction X can be in a horizontal left and right direction, or in a horizontal front and back direction, or in a horizontal inclined direction. Some embodiments of the present application are described using the example of the first direction X pointing in the left and right directions. In some embodiments, along the first direction X, the cross-sectional area of ​​the base 21 along its thickness direction Y is uniformly arranged. In this solution, the base 21 adopts the above-mentioned arrangement to ensure the welding strength between it and the top cover 22, and can reduce its own processing difficulty and reduce production costs.

[0164] With reference to Figures 28 to 33, the specific arrangement of the boss 2131 is described below. In some embodiments, along the thickness direction Y, the boss 2131 has a first end 210 close to the base 21 and a second end 220 away from the base 21. With reference to the orientation in Figure 29, the first end 210 of the boss 2131 is the lower end, and the second end 220 is the upper end. In this solution, the cross-sectional area of ​​the first end 210 of the boss 2131 along the first direction X is larger than the cross-sectional area of ​​the second end 220 along the first direction X, so that when the tab 212 is pressed onto the boss 2131, the deformation effect of the tab 212 can be guaranteed, so that the tab 212 fits tightly against the adapter 213, thereby ensuring the welding quality between the tab 212 and the adapter 213 and improving the yield rate of the battery 20. It should be noted that the specific structural shape of the boss 2131 can be determined according to actual conditions.

[0165] Referring to Figure 29 , in some embodiments, the cross-sectional area of ​​the boss 2131 along the first direction X increases non-uniformly from the first end 210 to the second end 220. Referring to Figure 32 , in other embodiments, the cross-sectional area of ​​the boss 2131 along the first direction X may also increase uniformly from the first end 210 to the second end 220. Specifically, the cross-sectional area of ​​the boss 2131 along the first direction X may increase linearly or non-linearly. The specific configuration of the boss 2131 may depend on actual circumstances. Some embodiments of the present application are described using the example of a uniform increase in the cross-sectional area of ​​the boss 2131 along the first direction X.

[0166] The following introduces the number of bosses 2131 on the base 21. In some embodiments, the adapter 213 includes a plurality of bosses 2131, and each boss 2131 is arranged at intervals along the first direction X. By providing a plurality of bosses 2131, this solution can further enhance the pre-tightening effect of the adapter 213 on the tab 212, thereby ensuring the stability of the connection between the tab 212 and the adapter 213. It can be understood that the intervals between the bosses 2131 can be uniform or non-uniform. In other embodiments, the adapter 213 can also be provided with only a single boss 2131. The specific number of bosses 2131 can be determined according to actual conditions. This application is described by taking the provision of a single boss 2131 as an example.

[0167] In one embodiment of the present application, a battery 20 is also provided, comprising a transfer plate 213 as described in the above embodiment. In one embodiment, the battery 20 can omit the pre-welding operation of the tab 212 before welding the tab 212 to the transfer plate 213, effectively improving welding efficiency. Furthermore, because the boss 2131 can press the tab 212, the gap between the tab 212 and the transfer plate 213 can be effectively reduced, allowing the tab 212 to fit the transfer plate 213, thereby ensuring the welding quality of the tab 212 and improving the yield rate of the formed battery 20.

[0168] In one embodiment of the present application, a soldering member 214 may be provided on the side of the tab 212 of the battery 20 facing away from the adapter 213. Specifically, the soldering member 214 may be provided in a sheet shape. The provision of the soldering member 214 in this solution can further improve the welding effect between the tab 212 and the adapter 213, thereby ensuring the quality of the battery 20.

[0169] In one embodiment of the present application, a method for manufacturing a battery 20 is further provided. The method for manufacturing the battery 20 is prepared by using the laser welding method for the multi-layer tabs 212 of the battery cell 211 described in any one (or a combination of multiple) of the above-mentioned embodiments (examples). The method for manufacturing the battery 20 includes the following steps:

[0170] After welding the multi-layer tabs 212 to the adapter 213, the assembly 21 is obtained;

[0171] Prepare a housing 23 having a receiving cavity 231 with one end open;

[0172] Place the end of the assembly 21 facing away from the adapter plate 213 into the accommodating cavity 231 through the opening;

[0173] Snap the top cover 22 onto the opening;

[0174] The top cover 22 is welded to the housing 23 to seal the opening.

[0175] In the manufacturing method of the battery 20, the multi-layer tabs 212 can be directly welded to the adapter 213 without pre-welding, which reduces the welding process of pre-welding the multi-layer tabs 212 and then welding them to the adapter 213, greatly improving the production efficiency of the battery 20 production process.

[0176] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0177] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0178] The above are merely optional embodiments of the present application and do not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for laser welding multi-layer tabs of a battery cell, wherein: The battery cell multi-layer tab laser welding method comprises the following steps: Placing the adapter plate on the first pressing plate; Placing the multi-layer tab on a side of the adapter sheet facing away from the first pressing plate; Pressing the second pressing plate onto the side of the multi-layer tab facing away from the adapter sheet, and the side of the multi-layer tab close to the second pressing plate can at least protrude beyond the edge of the second pressing plate; The multi-layer tab is welded to the adapter plate using the laser welding device.

2. The battery core multi-layer tab laser welding method according to claim 1, wherein: The second pressing plate has a laser through hole. When the second pressing plate is pressed onto the multi-layer tab, the welding portion of the multi-layer tab can be exposed through the laser through hole. The laser welding device emits laser toward the laser through hole.

3. The battery core multi-layer tab laser welding method according to claim 1, wherein: The adapter plate has a boss, and when the second pressing plate is pressed onto the multi-layer tab, the boss can push out the welding portion of the multi-layer tab, so that the multi-layer tab is stretched and fits against the boss.

4. The method for laser welding multi-layer tabs of a battery cell according to claim 3, wherein: The boss has a welding plane on one side facing the multi-layer tab. When the second pressing plate is pressed onto the multi-layer tab, the welding portion of the multi-layer tab covers the welding plane, and the welding portion of the multi-layer tab is configured as a plane.

5. The battery cell multi-layer tab laser welding method according to claim 3, wherein: The second pressing plate has a laser through hole, and when the second pressing plate is pressed onto the multi-layer tab, the welding portion of the multi-layer tab can be exposed through the laser through hole; The edge of the boss has an upper surface, and the second pressing plate includes a pressing head, and the pressing head is arranged on the peripheral side of the laser through hole; During the process of pressing the second pressing plate onto the multi-layer tab, the trajectory of the contact point of the pressing head on the multi-layer tab matches the shape of the upper surface, so that the multi-layer tab is stretched and fits against the boss.

6. The battery cell multi-layer tab laser welding method according to claim 1, wherein: Before the second pressing plate is pressed onto the multi-layer tab, the battery cell multi-layer tab laser welding method further comprises the following steps: The soldering element is placed on a side of the multi-layer tab facing away from the adapter.

7. The battery cell multi-layer tab laser welding method according to claim 1, wherein: The battery includes a top cover, and the adapter is placed before the first pressing plate, or before the multi-layer tabs to be welded and the adapter are prepared. The battery cell multi-layer tab laser welding method further includes the following steps: Connecting the adapter to the top cover; After preparing the multi-layer tabs and the adapter to be welded; The top cover is placed on the first pressing plate, with the side of the top cover facing away from the adapter sheet contacting the first pressing plate.

8. The battery cell multi-layer tab laser welding method according to claim 7, wherein: The first pressing plate is provided with a first positioning portion. After preparing the multi-layer tabs and the adapter to be welded, the battery cell multi-layer tab laser welding method further comprises the following steps: Position the top cover on the first positioning portion.

9. The battery cell multi-layer tab laser welding method according to claim 1, wherein: The second pressing plate is provided with a second positioning portion, the multi-layer tab is connected to the battery cell, and the adapter is placed on the first pressing plate. The battery cell multi-layer tab laser welding method further includes the following steps: Position the battery cell at the second positioning portion.

10. A press-fitting tool for press-fitting a tab onto a switching piece of a battery top cover, applied to the battery cell multi-layer tab laser welding method according to any one of claims 1 to 9, wherein: The press-fitting tool comprises: The first pressing plate is provided with a battery top cover placement position; A second pressing plate is provided with a main body and a pressing head, wherein the pressing head extends from the main body toward the battery top cover placement position, and a pressing surface is provided on a side of the pressing head close to the battery top cover placement position, wherein the pressing surface is a curved surface or an inclined surface; The second pressing plate can be raised and lowered relative to the first pressing plate, so that the pressing surface contacts the tab and presses the tab onto the adapter.

11. The press-fitting tool according to claim 10, wherein: The width of the pressing head gradually decreases in a direction close to the battery top cover placement position, and forms an arc-shaped pressing surface at a position closest to the battery top cover placement position.

12. The press-fitting tool according to claim 10, wherein: There are two pressure heads, which are a first pressure head and a second pressure head respectively. The first pressure head and the second pressure head are arranged at an interval to form a first spacing space between the two; the corner edge of the first pressure head close to the second pressure head and the corner edge of the second pressure head close to the first pressure head serve as the pressing surface.

13. The press-fitting tool according to claim 12, wherein: The main body is provided with a laser through-hole, which is opposite to and connected to the first spacing space; the pressing tool also includes a laser welding device, which is located above the laser through-hole, and the laser welding device is configured so that the laser emitted by the laser welding device can pass through the laser through-hole and the first spacing space in sequence.

14. The press-fitting tool according to claim 10, wherein: The first pressing plate is connected to the main body via a guide member, and the guide member is used to limit the second pressing plate from rising or falling relative to the first pressing plate along a fixed direction.

15. The press-fitting tool according to claim 14, wherein: The guide member includes a linear bearing, one of which is fixed to the first pressing plate, and the other is fixed to the main body.

16. The press-fitting tool according to claim 14, wherein: The guide member includes a cylinder driving device, which is connected to the main body and / or the first pressing plate. The cylinder driving device is used to drive the second pressing plate to rise and fall relative to the first pressing plate.

17. The press-fitting tool according to claim 10, wherein: The adapter plate includes a base and a boss, the base is connected to the battery top cover, the boss is connected to the side of the base close to the first pressure plate, and the width of the boss gradually decreases in a direction away from the base; There are two pressing heads, which are spaced apart. When the pressing surface presses the tab to the adapter, the two pressing heads press on both sides of the boss respectively.

18. The press-fitting tool according to claim 17, wherein: Both sides of the boss are configured as arc surfaces; Alternatively, both sides of the boss are configured as inclined surfaces; Alternatively, one side of the boss is configured as a curved surface, and the other side of the boss is configured as an inclined surface.

19. The press-fitting tool according to claim 10, wherein: The first pressing plate is provided with a receiving groove, which serves as a placement position for the battery top cover; the first pressing plate is provided with a battery cell groove, which is used to place the battery cell, and the battery cell includes the tab.

20. The press-fitting tool according to claim 10, wherein: The press fitting tool also includes a locking mechanism; wherein, The first pressing plate has a first positioning portion, the first positioning portion is for placing the adapter plate and for limiting the adapter plate, the first pressing plate is also for placing the battery cell, and the multi-layer tabs of the battery cell abut against the adapter plate; The second pressing plate is used to absorb the soldering element and press the soldering element against the side of the multi-layer tab facing away from the adapter. The second pressing plate is provided with a laser through-hole, and the soldering element is at least partially exposed from the laser through-hole. The laser through-hole allows a laser beam to pass through to weld the multi-layer tab and the adapter. The locking mechanism is used to lock and fix the second pressing plate and the first pressing plate, so that the multi-layer tab and the multi-layer tab and the adapter are tightly fitted together.

21. The press-fitting tool according to claim 20, wherein: The locking mechanism includes a plurality of fasteners, which are arranged around the laser through-hole and are used to lock, fix or release the first pressing plate and the second pressing plate.

22. The press-fitting tool according to claim 21, wherein: The first pressing plate includes a first guide member, the second pressing plate includes a second guide member, and the first guide member and the second guide member are positioned and guided together.

23. The press-fitting tool according to claim 20, wherein: The second pressure plate includes a mounting part and an adsorption assembly. The laser through-hole is formed on the mounting part. The adsorption assembly is connected to the mounting part. The adsorption assembly is arranged around the laser through-hole. The adsorption assembly is provided with at least two rows of adsorption ports. The adsorption assembly is used to adsorb, fix or release the soldering iron through the at least two rows of adsorption ports.

24. The press-fitting tool according to claim 23, wherein: The adsorption assembly includes two adsorption members and two vacuum joints, the two adsorption members are connected to the mounting member and are spaced apart, one row of the at least two rows of adsorption ports is formed on the corresponding adsorption member, and the two adsorption members are each provided with an air flow channel connected to the corresponding row of adsorption ports; The two vacuum joints are connected to the mounting member, one end of the two vacuum joints is connected to the corresponding air flow channel, and the other end is connected to the external air path system.

25. The press-fitting tool according to claim 24, wherein: The two adsorption members are both formed with a pressing portion on one side facing the other, and the pressing portion is arranged in an arc shape.

26. The press-fitting tool according to claim 24, wherein: The adsorption member includes a crimping body, which has a mounting portion and a holding portion. The mounting portion is fixedly connected to the mounting member, and the holding portion is connected to the mounting portion and is arranged at an angle to the mounting portion.

27. The press-fitting tool according to claim 26, wherein: The adsorbent also includes a sealing body, the pressing part is provided with an air flow groove, the mounting part is provided with an air flow hole, the sealing body is provided with a sealing groove, the sealing body is arranged between the pressing part and the mounting part, and is sealed and connected to the pressing part and the mounting part, and the sealing body is used to cooperate with the pressing part and the mounting part to form the air flow channel.

28. The press-fitting tool according to claim 20, wherein: The second pressing plate further includes a cleaning assembly, which is connected to the mounting member and arranged along the circumferential direction of the laser through hole; The cleaning component is provided with an air blowing port and a dust extraction port which are arranged opposite to each other. The two adsorption parts cooperate to form an extension channel which is connected to the laser through hole. The air blowing port and the dust extraction port are both arranged toward the extension channel. The cleaning component blows air through the air blowing port and extracts air through the dust extraction port to clean the dust generated during the welding process.

29. The press-fitting tool according to claim 28, wherein: The cleaning assembly includes a blowing member and a dust extraction member, the blowing member is connected to the mounting member and is provided at one end of the two adsorption members, the dust extraction member is connected to the mounting member and is provided at the other end of the two adsorption members, the blowing member is provided with a blowing channel, the blowing port is formed at one end of the blowing channel and is open, and the other end of the blowing channel is connected to the external air circuit system through the air injection joint; The dust extraction member is provided with a dust extraction channel, the dust extraction port is formed at an opening at one end of the dust extraction channel, and the opening at the other end of the dust extraction channel is communicated with an external air path system through an air extraction joint.

30. An adapter for connecting a tab and a top cover of a battery, applied to the press-fitting tool according to any one of claims 10 to 29, wherein: The adapter comprises: matrix; A boss is provided on a side wall of the base along the thickness direction thereof, and the boss is used for welding the tab; The boss is suitable for pressing the tab to deform the tab, so as to pre-tighten the tab before welding it.

31. The adapter sheet according to claim 30, wherein: Along the thickness direction, the base has a first thickness H1, and the boss has a second thickness H2, wherein H1:H2 is 0.25-4.

32. The adapter sheet according to claim 31, wherein: The first thickness H1 is 0.5 mm to 2 mm, and the second thickness H2 is 0.5 mm to 3 mm.

33. The adapter sheet according to claim 30, wherein: The plane of the base facing the boss is a projection plane. Along the thickness direction, the base forms a first orthographic projection S1 on the projection plane, and the boss forms a second orthographic projection S2 on the projection plane, wherein S1:S2 is 3-6.

34. The adapter sheet according to claim 33, wherein: The area of ​​the first orthographic projection S1 is 300 mm 2 ~810mm 2 ; The area of ​​the second orthographic projection S2 is 60mm 2 ~250mm 2 .

35. The adapter sheet according to claim 30, wherein: Along a first direction, the cross-sectional area of ​​the substrate along the thickness direction is uniformly arranged, and the first direction is perpendicular to the thickness direction.

36. The adapter sheet according to claim 35, wherein: Along the thickness direction, the boss has a first end close to the base and a second end away from the base, wherein a cross-sectional area of ​​the first end along the first direction is greater than a cross-sectional area of ​​the second end along the first direction.

37. The adapter sheet according to claim 36, wherein: From the first end to the second end, the cross-sectional area of ​​the boss along the first direction increases non-uniformly.

38. The adapter sheet according to claim 36, wherein: The adapter plate includes a plurality of bosses, and the bosses are arranged at intervals along the first direction.

39. A battery, wherein Including the adapter sheet as described in any one of claims 30-38.

40. A battery manufacturing method, applied to the battery according to claim 39, wherein: The battery cell multi-layer tab laser welding method according to any one of claims 1 to 9 is used for preparation, and the battery manufacturing method comprises the following steps: After welding the multi-layer tabs to the adapter sheet, an assembly is obtained; preparing a housing having a receiving cavity with one end open; Place the end of the assembly facing away from the adapter plate into the accommodating cavity through the opening; Buckle the top cover onto the opening; The top cover is welded to the housing to seal the opening.

Images