WO2024000128A1

WO2024000128A1 - Soldering method, soldering device, and battery manufacturing apparatus

Info

Publication number: WO2024000128A1
Application number: PCT/CN2022/101681
Authority: WO
Inventors: 王曦童
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2024-01-04
Also published as: CN116867597A

Abstract

A soldering method, for use in soldering tab sets (211) of a motor assembly (210) to adapters (220). The soldering method comprises: positioning an area to be soldered of each tab set; cutting the tab set to remove a redundant portion around said area; and soldering the cut tab set to an adapter. The soldering method facilitates improving the soldering yield of soldering between the tab set and the adapter, reducing the risk of pseudo soldering of tabs, and effectively improving battery performance. The present invention also relates to a soldering device and a battery manufacturing apparatus.

Description

Welding methods, welding devices and battery manufacturing equipment

Technical field

The present application relates to the technical field of battery production, specifically, to a welding method, a welding device and battery manufacturing equipment.

Background technique

Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

In battery production, how to increase the energy density of batteries while reducing battery weight is an urgent problem that needs to be solved.

Contents of the invention

This application provides a welding method, a welding device and battery manufacturing equipment. The welding method can effectively reduce the weight of the battery and increase the energy density of the battery.

In a first aspect, the present application provides a welding method for welding a tab group of an electrode assembly to an adapter. The welding method includes: positioning the area to be welded of the tab group; cutting the tab group to remove the areas to be welded. The excess part around the welding area; weld the cut tab set to the adapter.

In the technical solution of this application, before welding the tab set of the electrode assembly to the adapter, the area to be welded of the tab set is first positioned. This step is to locate the area to be welded on the tab set to facilitate subsequent alignment. The excess part of the non-welded area of the tab group is cut to reduce the difficulty of subsequent cutting operations and ensure cutting accuracy. At the same time, this step is also a preliminary reshaping of the tab assembly, which plays a certain role in adjusting the possible curling, bending, wrinkles and other deformations of the tab, which is beneficial to improving the welding yield of the tab assembly and the adapter, and reducing the There is a risk of false welding of the pole tabs, thereby effectively improving the performance stability of the battery.

After locating the area to be welded of the tab group, cut the tab group and remove the excess parts around the area to be welded. This ensures sufficient welding area between the tab group and the adapter while effectively reducing the weight of the tab group, thereby reducing The overall weight of the battery. At the same time, the size of the cut tab group is reduced, which can correspondingly reduce the area of the adapter, thereby effectively reducing the weight of the adapter and further reducing the weight of the battery; in addition, the volume of the adapter and the tab group is reduced. Small, the space occupancy rate is reduced, thereby effectively improving the energy density of the battery.

According to some embodiments of the present application, positioning the area to be welded of the tab group includes: using a first pressing member to press the tab group so that each tab in the tab group converges with each other, and the first pressing member and the pole The contact surface of the ear group is the area to be welded.

In the above technical solution, the first pressing member is used to press the tab group, so that the tabs in the tab group are aggregated with each other, thereby pre-positioning the tab group in the state after welding with the adapter. In this state Cutting off the excess parts of the tab set can effectively improve the neatness of the edges after the tab set is welded to the adapter, and reduce the risk of edge redundancy after the cut tab set is welded to the adapter; At the same time, the contact surface between the first pressing member and the tab group is the surface to be welded, so that the first pressing member directly defines the surface to be welded on the tab group during the process of positioning the tab group, ensuring that the surface to be welded is It also facilitates improving the cutting accuracy of the tab set and minimizing the area of the non-welded area of the tab to ensure a stable connection between the tab and the adapter while minimizing the weight of the battery and increasing the energy density of the battery.

According to some embodiments of the present application, after cutting the tab group, the welding method further includes: connecting the cut edges of each tab in the tab group to each other.

In the above technical solution, after removing the excess portion around the area to be welded of the tab group, the cut edges of each tab are connected to each other, so that the cut tab group can be relatively stably maintained in a state of mutual aggregation. state, that is, preforming the shape of the tab set, reducing the risk of loosening and bending of the tab set during subsequent transportation and welding of the electrode assembly, and effectively improving the welding accuracy and welding stability of the adapter and the tab set. properties, reducing risks such as false welding and weld cracking, thereby effectively improving the performance stability of the battery.

At the same time, the edges of each tab of the tab group are connected to each other. When welding the tab group to the adapter, it can effectively reduce the risk of impurities such as welding slag and metal shavings falling into the tab group and causing a battery short circuit. Effectively improve battery safety performance.

According to some embodiments of the present application, connecting the cut edges of each tab in the tab group to each other includes: heat-melting the cut edges of each tab to each other.

In the above technical solution, the cut edges of the tabs are connected to each other by hot melting. The edge positions of each tab are melted by heat. The melted structures are fused with each other and then cooled, so that the tabs can be connected to each other. Hot melting is used to connect each tab. On the one hand, it can effectively prevent other materials from entering the tab group, thereby effectively ensuring the performance stability of the tab group. On the other hand, hot melting can cut each tab of the tab group. Repair the last edge to reduce the probability of metal burrs on the edge of the tab.

According to some embodiments of the present application, connecting the cut edges of each tab in the tab group to each other includes: bonding the cut edges of each tab to each other through colloid.

In the above technical solution, the cut edges of each tab are bonded to each other through colloid. The colloid bonding method is simple to operate and is not easy to cause damage to the tabs, effectively ensuring the connection yield and having strong practicability; at the same time, the colloid It can cover and bond undesirable parts such as metal burrs or cracks that may exist on the edge of the tab, improve the structural strength of the edge of the tab after cutting, and reduce the probability of metal burrs on the edge of the tab.

In a second aspect, this application also provides a welding device for welding the tab set of the electrode assembly to the adapter, including: a positioning mechanism for positioning the area to be welded of the tab set of the electrode assembly; and a cutting mechanism , used to cut the tab set and remove excess parts around the area to be welded; the welding mechanism is used to weld the cut tab set to the adapter.

The welding device in the technical solution of this application uses a positioning mechanism to position the area to be welded of the tab group to facilitate quick removal of the excess parts of each tab, and uses a cutting mechanism to cut the excess around the area to be welded of the tab group. part to separate the excess parts outside the area to be welded from the tab set. The cutting method is not easy to damage the integrity of the tab welding area, which is conducive to ensuring the structural strength of the tab after cutting; the welding mechanism is used to cut the tab The pole tab group and the adapter are welded to ensure a stable connection between the pole tab group and the adapter.

According to some embodiments of the present application, the positioning mechanism includes a first pressing member. The first pressing member is used to press the tab group so that each tab in the tab group converges with each other. The first pressing member and the tab The contact surface of the group is the area to be welded.

In the above technical solution, the positioning mechanism uses the first pressing member to press the tab group, so that the tabs of the tab group converge with each other, and finally at least the parts of each tab corresponding to the first pressing member fit together. The contact surface between the first pressing member and the tab group is the area to be welded, and the first pressing member makes the areas where the tabs fit together form the area to be welded, and the first pressing member pre-positions the tab group. It is the state after welding with the adapter. Removing the excess part of the tab group in this state can effectively improve the uniformity of the edges after the tab group is welded to the adapter, and reduce the risk of the tab group being welded to the adapter. There is still a risk of edge redundancy; the first pressing member effectively ensures the area of the surface to be welded while improving the cutting accuracy of the tab set and reducing the area of the non-welding area of the tab as much as possible to ensure that the tab The connection with the adapter is stable while minimizing the weight of the battery and increasing the energy density of the battery.

According to some embodiments of the present application, the welding mechanism includes an ultrasonic welding head, and the end surface of the first pressing member and the end surface of the ultrasonic welding head have the same shape and equal areas.

In the above technical solution, the end face of the ultrasonic welding head of the welding mechanism has the same shape and equal area as the end face of the first pressing member, so as to ensure that the first pressing member can more accurately position the welding area and more accurately ensure the area to be welded. area, thereby minimizing the redundancy of the tab group while ensuring the welding area of the tab group, thereby reducing the weight of the battery while ensuring the stability of battery performance.

According to some embodiments of the present application, the positioning mechanism further includes a second pressing member, and the second pressing member is used to cooperate with the first pressing member to clamp the tab group.

In the above technical solution, the positioning mechanism includes a first pressing member and a second pressing member that cooperate with each other. The first pressing member and the second pressing member cooperate to clamp the tab group to stably position the tab group in the Between the first pressing member and the second pressing member, at the same time, the first pressing member and the second pressing member are arranged to facilitate flexible adjustment of the positioning position of the tab group, thereby facilitating the different structural requirements of the electrode assembly. The tab set can be flexibly positioned on both sides or at any intermediate position in the tab stacking direction, which has strong flexibility and versatility.

According to some embodiments of the present application, the welding device further includes: a switching mechanism for switching the positions of the welding mechanism and the first pressing member.

In the above technical solution, the welding device includes an exchange mechanism that can exchange the positions of the welding mechanism and the first pressing member. The exchange mechanism is arranged to facilitate the positioning, cutting and welding of the tab assembly without moving the electrode assembly, reducing the cost. The transfer time of the electrode assembly between work stations improves the production efficiency of the battery; more importantly, it can effectively reduce the risk of bending and deformation of the tab set of the electrode assembly due to transportation, repositioning, etc., thereby further improving the battery production yield and performance stability.

According to some embodiments of the present application, the exchange mechanism includes: a rotating member; a driving member for driving the rotating member to rotate; wherein the welding mechanism and the first pressing member are installed on the rotating member and are located on both sides of the rotation center line of the rotating member .

In the above technical solution, the exchange mechanism includes a driving part and a rotating part driven and rotated by the driving part. The welding mechanism and the first pressing part are installed on the rotating part. The driving part drives the rotating part to rotate at a certain angle, so that the welding mechanism and the third pressing part can be connected. The position of the pressing member is exchanged, and the setting of the rotating member is convenient for driving the first pressing member and the welding mechanism to work on the electrode assembly in sequence, and the shaping of the tab group of the electrode assembly and the connection between the tab group and the adapter are completed at the same station. welding.

According to some embodiments of the present application, the welding device further includes: a connecting mechanism configured to connect the cut edges of each tab in the tab group to each other.

In the above technical solution, the welding device includes a connecting mechanism, which connects the cut edges of each tab of the tab group to each other, so that the tab groups are maintained in a state of mutual convergence and aggregation.

According to some embodiments of the present application, the connection mechanism is configured to heat-melt the cut edges of each tab in the tab group, so that each tab in the tab group is connected to each other.

In the above technical solution, the connecting mechanism heat-melts the cut edges of each tab of the tab group so that the tabs are connected to each other.

According to some embodiments of the present application, the connecting mechanism is configured to apply colloid to the cut edges of each tab in the tab group, so that the tabs in the tab group are bonded to each other.

In the above technical solution, the connecting mechanism applies colloid to the cut edges of each tab of the tab group, so that the cut edges of each tab of the tab group are bonded to each other through the colloid.

According to some embodiments of the present application, the welding device further includes: a dust suction mechanism for absorbing dust generated when the cutting mechanism cuts the tab set.

In the above technical solution, the welding device is equipped with a dust suction mechanism to absorb the dust generated when cutting the tab assembly, thereby reducing the risk of metal debris and dust generated during cutting of the tab assembly entering the inside of the tab or the main body of the electrode assembly, thereby effectively Avoid battery short circuit abnormalities caused by metal debris, thereby effectively improving battery performance stability and safety.

In a third aspect, the present application also provides battery manufacturing equipment, including the welding device as described in any of the above solutions.

According to some embodiments of the present application, the battery manufacturing equipment further includes: a separator for isolating the main body of the electrode assembly from the welding device, the separator having an opening for the tab set to pass through.

In the above technical solution, the battery manufacturing equipment includes a separator for isolating the main body of the electrode assembly and the welding device. The arrangement of the separator can effectively reduce the risk of welding slag generated when the tab assembly is welded to the adapter and enters the main body area of the electrode assembly. , thereby effectively reducing the risk of battery short circuit due to metal welding, thereby effectively improving the performance stability and safety of the battery.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the drawings without exerting creative efforts.

Figure 1 is an exploded view of a conventional battery cell;

Figure 2 is a front perspective view of the tab set of the electrode assembly of a conventional battery cell welded to the adapter;

Figure 3 is a front perspective view of the tab set of the electrode assembly of the battery cell welded to the adapter according to some embodiments of the present application;

Figure 4 is a schematic flow chart of a welding method provided by some embodiments of the present application;

Figure 5 is a structural front view of a welding device provided by some embodiments of the present application;

Figure 6 is a structural front view of the state of the area to be welded by the positioning mechanism of the positioning tab group provided by some embodiments of the present application;

Figure 7 is a structural front view of the welding mechanism of the welding device provided in some embodiments of the present application in a state aligned with the tab set;

Figure 8 is a structural front view of a welding device provided by some embodiments of the present application;

In the drawings, the drawings are not drawn to actual scale.

Marking description: 100-battery manufacturing equipment; 10-welding device; 11-positioning mechanism; 111-first pressing member; 1111-end face of first pressing member; 112-first telescopic driving member; 113-second pressing member Tightening parts; 114-second telescopic driving part; 12-cutting mechanism; 121-cutting part; 122-three-dimensional driving part; 123-first rotating driving part; 1221-third telescopic driving part; 13-welding mechanism; 131-ultrasonic welding head; 1311-end face of ultrasonic welding head; 14-switching mechanism; 141-driving part; 142-rotating part; 15-connecting mechanism; 151-second rotating driving part; 152-hot melt glue gun; 16 -Dust cleaning mechanism; 20-isolation piece; 21-sub-isolation piece; 22-opening; 200-battery cell; 210-electrode assembly; 211-pole tab group; 2111-area to be welded; 2112-excess part; 220- Adapter; 230-Shell;

X-first direction; Y-second direction; Z-third direction. .

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the appended drawings is not intended to limit the scope of the claimed application, but rather to represent selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and are therefore only used as examples and cannot be used to limit the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of this application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity or specificity of the indicated technical features. Sequence or priority relationship. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of this application, the term "plurality" refers to two or more (including two).

In the description of the embodiments of this application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right" and "vertical" The orientation or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship is only for the convenience of describing the embodiments of the present application and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the implementation of the present application. Example limitations.

In the description of the embodiments of the present application, unless otherwise explicitly stated and limited, technical terms such as "setting", "installation", "connecting", "connecting" and "fixing" should be understood in a broad sense. For example, it can be a fixed connection, or a fixed connection. It can be a detachable connection or integrated; it can be a mechanical connection, an electrical connection, or a signal connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an internal connection between two elements. interactive relationship. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of simplicity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only illustrative illustrations and should not constitute any limitation to the present application. .

The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

Please refer to Figures 1 and 2. Figure 1 is an exploded view of a conventional battery cell; Figure 2 is a front perspective view of the tab set of the electrode assembly of a conventional battery cell welded to an adapter; the battery cell 200 may include Housing 230, electrode assembly 210 and adapter 220. The electrode assembly 210 includes a positive electrode piece, a negative electrode piece and an isolation film. The pole piece includes a current collector and an active material layer. The active material layer is coated on the surface of the current collector. The current collector that is not coated with the positive active material layer protrudes from the current collector that is coated with the active material layer. The current collector that is not coated with the active material layer The current collector serves as the pole. In order to ensure that large currents can pass through without melting, the number of tabs is multiple and they are stacked together to form a tab group.

The adapter 220 plays the role of overcurrent and convergence, and is used to lead out the electric energy of the electrode assembly 210. The adapter 220 is connected to the tab set 211 of the electrode assembly 210.

In the development of battery production technology, how to reduce the weight of batteries and increase the energy density of batteries is an important issue that needs to be solved urgently.

The applicant analyzed the reason and found that before winding the pole piece into the electrode assembly 210, the empty foil area of the pole piece needs to be die-cut to generate the tab for the overcurrent of the battery cell 200. However, due to the thickness and isolation of the pole piece, Due to the influence of errors such as film thickness, die-cutting accuracy, and winding accuracy, mutual misalignment between the multi-layer tabs of the tab assembly 211 may easily occur after the pole piece is wound in multiple turns. When the tab set 211 is to be welded to the adapter 220, a certain welding area needs to be ensured. In order to ensure the soldering area, the die-cut size of the tabs is 80% to 120% or more larger than the actual welding area requirement. Therefore, after the tabs are welded to the adapter 220, there will be a lot of redundant parts around the welding area. The redundancy of the tabs makes the tab set 211 heavy and takes up a lot of internal space of the battery cell 200.

At the same time, because the overall surface area of the tab set 211 is large, the adapter 220 needs to reserve sufficient welding and avoidance areas, which also makes the adapter 220 heavy and takes up a lot of the internal space of the battery cell 200 .

Overall, the redundancy of the tab set 211 not only directly and indirectly increases the weight of the battery cell 200, but also occupies too much internal space of the battery cell 200, seriously restricting the improvement of the energy density of the battery.

Based on the above reasons, in order to reduce the weight of the battery and increase the energy density of the battery while ensuring the welding area of the tab group 211 . After research, the applicant has provided a welding method for welding the tab set 211 of the electrode assembly 210 to the adapter 220. When welding the tab set 211 to the adapter 220, first position the tab set 211 to be welded. area 2111, then cut the tab group 211, remove the excess portion 2112 around the area 2111 to be welded, and finally weld the cut tab group 211 to the adapter 220. The structure of the tab group of the battery cell processed by the welding method of this application and welded to the adapter is shown in Figure 3.

In the technical solution of the present application, before welding the tab set 211 of the electrode assembly 210 to the adapter 220, the area 2111 of the tab set 211 to be welded is first positioned to facilitate subsequent welding of the excess portion of the edge of the tab set 211. 2112 for cutting, reducing the difficulty of subsequent cutting operations and ensuring cutting accuracy.

After positioning the area 2111 of the tab group 211 to be welded, the tab group 211 is cut to remove the excess portion 2112 around the area 2111 to be welded, so as to ensure that the welding area of the tab group 211 and the adapter 220 is sufficient while effectively reducing the The weight of the tab set 211. At the same time, the size of the cut tab set 211 is reduced, which can correspondingly reduce the area of the adapter 220, thereby effectively reducing the weight of the adapter 220. The tab set 211 and the adapter 220 reduces the weight of the battery, effectively reducing the weight of the battery; furthermore, the adapter 220 and the tab group 211 are reduced in size, and their space occupation rate is reduced, thereby effectively increasing the energy density of the battery.

The welding method and welding device 10 disclosed in the embodiments of the present application can be, but are not limited to, used in the welding of electrode assemblies 210 and adapters 220 in which the tab groups 211 have a multi-layer structure, such as rolled electrode assemblies 210 and laminated electrode assemblies 210. welding.

According to some embodiments of the present application, please refer to Figures 2 and 3, and further refer to Figure 4. Figure 4 is a schematic flow chart of a welding method provided by some embodiments of the present application. The embodiment of the present application provides a welding method, which The welding method is used to weld the tab set 211 of the electrode assembly 210 and the adapter 220. The welding method includes:

S1: Position the area 2111 to be welded of the tab group 211;

S2: Cut the tab group 211 and remove the excess part 2112 around the area to be welded 2111;

S3: Weld the cut tab set 211 and the adapter 220.

The tab group 211 means that the electrode assembly 210 includes a plurality of stacked tabs, and the plurality of stacked tabs constitute the tab group 211 .

As mentioned above, the adapter 220 is a component provided in the battery cell 200 for overcurrent and converging. The adapter 220 is welded to the tab group 211 of the electrode assembly 210 .

The area to be welded 2111 refers to the welding area of the tab group 211 for welding with the adapter 220. Specifically, the tabs of the tab group 211 are gathered together along the stacking direction and welded to the first adapter 220. , the area where the tabs of the tab group 211 are gathered together and used for welding with the first adapter 220 is the above-mentioned area to be welded 2111.

"Positioning the area 2111 of the tab group 211 to be welded" means positioning the tab group 211 on the tab group 211 after the tabs of the tab group 211 are brought together and gathered together by methods such as pressing and clamping. The area welded to the first adapter 220 .

The cutting tab set 211 can adopt conventional cutting methods such as physical cold pressing cutting, laser cutting, and traditional cutter cutting.

It can be understood that "removing the excess portion 2112 around the area to be welded 2111" refers to removing the excess portion on both sides of the tab group 211 in the width direction (the first direction X shown in the figure), and removing the tabs. The excess portion of one end of the group 211 in the height direction (the third direction Z shown in the figure) away from the main body area of the electrode assembly 210.

In the technical solution of the present application, before welding the tab group 211 of the electrode assembly 210 to the adapter 220, the area to be welded 2111 of the tab group 211 is first positioned, and after the area 2111 to be welded is positioned, the area to be welded is cut. Cut the tab set 211 and remove the excess portion 2112 around the area to be welded 2111, which effectively reduces the weight of the tab set 211 while ensuring sufficient welding area between the tab set 211 and the adapter 220, thereby reducing the overall weight of the battery. At the same time, the size of the cut tab set 211 is reduced, which can correspondingly reduce the area of the adapter 220, thereby effectively reducing the weight of the adapter 220 and further reducing the weight of the battery; and, the adapter 220 and the tabs The volume of the group 211 is reduced and the space occupancy rate is reduced, thereby effectively increasing the energy density of the battery.

In some embodiments, please continue to refer to Figures 2 to 4, and further refer to Figure 5. Figure 5 is a structural front view of a welding device provided in some embodiments of the present application. When positioning the area 2111 of the tab group 211 to be welded: The first pressing member 111 is used to press the tab group 211 so that the tabs in the tab group 211 converge with each other. The contact surface between the first pressing member 111 and the tab group 211 is the area to be welded 2111.

It can be understood that the first pressing member 111 can move along the stacking direction of each tab of the tab group 211 (the second direction Y shown in FIG. 5 ) to stack the fluffy multi-layer poles of the tab group 211 . The ears are pressed together. The first pressing member 111 can cooperate with an operating surface such as a workbench to press each tab of the tab group 211 on the operating surface. Of course, a fitting part that can cooperate with the first pressing member 111 may also be provided, and the fitting part and the first pressing member 111 move toward each other to gradually clamp and press each tab of the tab group 211 to the first pressing member. between the fastener 111 and the mating part, where the contact area between the mating part and the tab group 211 can be larger than the contact area between the first pressing member 111 and the tab group 211 to provide more stable support to the tab group 211 Of course, the contact area between the fitting part and the tab group 211 may also be equal to the contact area between the first pressing member 111 and the tab group 211 .

“The contact surface between the first pressing member 111 and the tab group 211 is the area to be welded 2111 ” means that the area of the tab group 211 pressed by the first pressing member 111 is the area to be welded 2111 . The first pressing member 111 may include an end surface for pressing the tab group 211 , and the shape and area of the end surface are the same as the shape and area of the area to be welded 2111 .

In the above solution, the first pressing member 111 is used to press the tab group 211, so that the tabs in the tab group 211 are aggregated with each other, so that the tab group 211 is predetermined to be in a state after being welded to the adapter 220. Cutting the excess part of the tab set 211 in this state can effectively improve the neatness of the edges after the tab set 211 is welded to the adapter 220, and reduce the risk of the cut tab set 211 being welded to the adapter 220. There is still a risk of edge redundancy; at the same time, the contact surface between the first pressing member 111 and the tab group 211 is the surface to be welded, so that the first pressing member 111 directly contacts the tab group during the positioning process of the tab group 211. The upper limit of 211 defines the surface to be welded, ensuring the area of the surface to be welded while improving the cutting accuracy of the tab set 211 and reducing the non-welding area of the tabs as much as possible to ensure a stable connection between the tabs and the adapter 220 At the same time, try to reduce the weight of the battery and increase the energy density of the battery.

According to some embodiments of the present application, after the tab set 211 is cut, the cut edges of each tab in the tab set 211 are connected to each other.

There are many ways to connect the cut edges of each tab of the tab group 211 to each other. You can either connect the cut edge points of each tab, or you can seal all the cut edges of each tab. Edge connection, for example, the edges of each pole after being cut are all edge-sealed connections.

Among them, there are many ways to connect the cut edges of each tab. For example, the cut edges of each tab can be connected at multiple points by spot welding, or the edges of each tab can be connected by colloid bonding. The cut edges are glued to each other, etc.

After removing the excess portion 2112 around the area 2111 of the tab group 211 to be welded, the cut edges of each tab are connected to each other, so that the cut tab group 211 can be relatively stably maintained in a state of mutual aggregation. , that is, preforming the shape of the tab set 211, reducing the risk of loosening and bending of the tab set 211 during subsequent transportation and welding of the electrode assembly 210, and effectively improving the welding speed of the adapter 220 and the tab set 211. Accuracy and welding stability reduce the risks of false welding and weld cracking, thereby effectively improving the performance stability of the battery. At the same time, the edges of each tab of the tab set 211 are connected to each other. When the tab set 211 is welded to the adapter 220, impurities such as welding slag and metal shavings can be effectively reduced from falling into the tab set 211 and causing a battery short circuit. risks, thereby effectively improving the safety performance of the battery.

According to some embodiments of the present application, connecting the cut edges of each tab in the tab group 211 to each other includes: heat-melting the cut edges of each tab to each other.

"Hot-melting the cut edges of each tab to each other" means using laser welding, heating electrodes and other processing techniques to cause the cut edges of each tab to be heated and melted, and the melted parts of each tab are brought together to make the The cut edges of the individual tabs are connected to each other after cooling.

Hot melt is used to connect the cut edges of the tabs to each other. The edges of each tab are heated and melted. The melted structures are fused with each other and then cooled, so that the tabs are connected to each other through hot melting. Each tab can effectively prevent substances from other materials from entering the tab set 211, thereby effectively ensuring the performance stability of the tab set 211. On the other hand, hot melt can seal the cut tabs of the tab set 211. Repair the edges to reduce the probability of metal burrs on the edge of the tab.

According to some embodiments of the present application, connecting the cut edges of each tab in the tab group 211 to each other includes: bonding the cut edges of each tab to each other through colloid.

Among them, the colloid can be conductive glue and other conventional colloids that can bond metals. For example, hot melt glue can be used to bond the cut edges of each tab to each other. Specifically, the hot melt glue can be bonded to each other through heat. The glue melts, and the melted glue becomes a liquid. The hot melt glue is then applied to the edges of the cut multi-layer tabs through hot melt glue coating equipment. After the hot melt glue cools, the cutting of each tab is completed. The gluing of the cut edges is easy to operate, low in cost, and can replace traditional gluing operations.

The cut edges of each tab are bonded to each other with colloid. The colloid bonding method is simple to operate and will not easily cause damage to the tabs. It effectively ensures the connection yield and is highly practical. At the same time, the colloid can bond the edges of the tabs. Possible metal burrs or cracks and other undesirable parts serve to cover and bond, improve the structural strength of the edge of the tab after cutting, and reduce the probability of metal burrs on the edge of the tab.

According to some embodiments of the present application, please continue to refer to Figures 2 to 5 (the adapter is not shown in Figure 5, please refer to Figures 2 and 3 for the positional relationship between the adapter and the tab group). This application also provides A welding device 10, the welding device 10 is used to weld the tab set 211 of the electrode assembly 210 and the adapter 220. The welding device 10 includes a positioning mechanism 11, a cutting mechanism 12 and a welding mechanism 13. The positioning mechanism 11 is To position the area 2111 of the tab group 211 of the electrode assembly 210 to be welded; the cutting mechanism 12 is used to cut the tab group 211 to remove the excess portion 2112 around the area 2111 to be welded; the welding mechanism 13 is used to cut the The pole tab group 211 is welded to the adapter 220.

As mentioned before, "positioning the area 2111 of the tab set 211 to be welded" means positioning the poles on the tab set 211 after the tabs of the tab set 211 are gathered together by pressing, clamping, etc. The ear set 211 is used for the area welded to the first adapter 220 . Based on this, the positioning mechanism 11 can have a variety of implementation structures. The positioning mechanism 11 can include a pressing piece for pressing the tabs, and the pressing piece can be along the stacking direction of each tab of the tab group 211 (as shown in FIG. 5 (shown in the second direction Y) to press the fluffy multi-layer tabs of the tab group 211 together. The pressing member can be a single structure to cooperate with other operating surfaces such as a workbench to press each tab of the tab group 211 on the operating surface. Of course, the pressing member may also include two sub-pressing members that can move toward each other. The two sub-pressing members move toward each other to gradually clamp and press each tab of the tab group 211 between the two sub-pressing members. between.

The pressing piece may have a contact surface with the tab group 211. By controlling the contact area between the pressing piece and the tab group 211, the positioning mechanism 11 can position the area to be welded 2111 of the tab group 211 of the electrode assembly 210, that is, The area of the tab group 211 pressed by the pressing member forms the area to be welded 2111.

In some other embodiments, the pressing member and the tab set 211 may also be in line contact, and the end of the pressing member in contact with the tab set 211 may be in a frame-like or annular shape that matches the peripheral shape of the area to be welded 2111 structure, the area of the tab group 211 bounded by the pressing member forms the area to be welded 2111.

As mentioned before, "removing the excess portion 2112 around the area to be welded 2111" refers to removing the excess portion on both sides of the width direction of the tab group 211 (the first direction X in FIG. 2), and removing the electrodes. The excess portion 2112 of one end of the ear group 211 away from the main body of the electrode assembly 210 in the height direction (the third direction Z described in FIG. 2 ).

Based on this, the cutting mechanism 12 can also have a variety of implementation structures. The cutting mechanism 12 can include a driving mechanism and a cutting part such as a cutter or a laser knife driven by the driving mechanism. The driving mechanism drives the cutting part around the edge of the area to be welded 2111 Move so that the cutting member removes the excess portion 2112 around the area 2111 of the tab group 211 to be welded.

Exemplarily, as shown in Figure 5, the cutting mechanism 12 includes a three-dimensional driving member 122, a first rotary driving member 123 and a cutting member 121. The first rotary driving member 123 is installed at the execution end of the three-dimensional driving member 122, and the cutting member 121. 121 is installed at the execution end of the first rotary driving member 123. The three-dimensional driving member 122 drives the cutting member 121 to expand and contract along the second direction Y to approach or stay away from the tab group 211. At the same time, the three-dimensional driving member 122 drives the cutting member 121 to move in the second direction Y. The first rotational driving member 123 can drive the cutting member 121 to change its own position while moving along the cutting trajectory. Cutting direction.

Among them, the three-dimensional driving member 122 can use a three-axis or more manipulator, as long as it can meet the purpose of driving the cutting member 121 to move in a three-dimensional space.

The welding mechanism 13 can be an ultrasonic welding mechanism, laser welding or other conventional welding equipment that can be used for welding the electrode assembly 210, and is not uniquely limited here.

The welding device 10 in the technical solution of the present application uses the positioning mechanism 11 to position the area 2111 of the tab group 211 to be welded, so as to quickly remove the excess portion 2112 of each tab, and uses the cutting mechanism 12 to cut the tab group 211 The excess portion 2112 around the area to be welded 2111 is separated from the tab group 211 by the excess portion 2112 outside the area to be welded 2111. The cutting method is not easy to damage the integrity of the tab welding area and is conducive to ensuring the tab cutting. The final structural strength is improved; the welding mechanism 13 is used to weld the cut tab set 211 and the adapter 220 so that the tab set 211 and the adapter 220 are stably connected.

According to some embodiments of the present application, please continue to refer to Figure 5, and further refer to Figure 6. Figure 6 is a structural front view of the positioning mechanism to position the area to be welded of the tab group provided in some embodiments of the present application. The positioning mechanism 11 includes The first pressing member 111 is used to press the tab group 211 so that the tabs in the tab group 211 converge with each other. The contact surface between the first pressing member 111 and the tab group 211 is Area to be welded 2111.

The first pressing member 111 moves along the stacking direction of each tab of the tab set 211 (the second direction Y shown in FIG. 5 ) to press the fluffy multi-layer tabs of the tab set 211 together. Of course, the positioning mechanism 11 may also include a fitting part that can cooperate with the first pressing member 111 , and the fitting part and the first pressing member 111 move toward each other to gradually clamp and press each tab of the tab group 211 together. between the first pressing member 111 and the mating part.

It can be understood that the positioning mechanism 11 may also include a first telescopic driving member 112. The first telescopic driving member 112 drives the first pressing member 111 to expand and contract along the second direction Y, so that the first pressing member 111 positions the tab group. 211 or release the tab group 211.

Among them, the first telescopic driving member 112 can use conventional linear driving mechanisms such as servo electric cylinders, air cylinders, and linear modules.

"The contact surface between the first pressing member 111 and the tab group 211 is the area to be welded 2111" means that after the first pressing member 111 presses the tab group 211, the first pressing member 111 is in surface contact with the tab group 211 , the area of the tab group 211 pressed by the first pressing member 111 is the area to be welded 2111.

In some other embodiments, the first pressing member 111 may also be in line contact with the tab group 211 . That is to say, the end of the first pressing member 111 acting on the tab group 211 covers the area 2111 to be welded. On the periphery, the area of the tab group 211 covered by the first pressing member 111 is the area to be welded 2111.

The positioning mechanism uses the first pressing member 111 to press the tab group 211, so that the tabs of the tab group 211 converge with each other, and finally at least the parts of each tab corresponding to the first pressing member 111 fit together, and at the same time , the first pressing member 111 causes the areas of each tab to be welded to form the area to be welded 2111. The first pressing member 111 predetermines the tab group 211 to a state after welding with the adapter 220. In this state Removing the excess parts of the tab set 211 can effectively improve the neatness of the edges after the tab set 211 is welded to the adapter 220, and reduce the risk of edge redundancy after the tab set 211 is welded to the adapter 220. .

According to some embodiments of the present application, please continue to refer to Figures 5 and 6. The welding mechanism 13 includes an ultrasonic welding head 131. The end surface 1111 of the first pressing member and the end surface 1311 of the ultrasonic welding head have the same shape and equal areas.

“The end surface 1111 of the first pressing member” refers to the end surface of the first pressing member 111 acting on the tab group 211 for contacting the tab group 211 .

The end face 1311 of the ultrasonic welding head refers to the end face of the transmitting end of the ultrasonic welding head 131 for emitting ultrasonic energy. The shape and size of the end face 1311 of the ultrasonic welding head limit the area of the soldering mark formed on the tab group 211 . The end face 1111 of the first pressing member and the end face 1311 of the ultrasonic welding head have the same shape and the same area, which effectively ensures the reserved accuracy of the area to be welded 2111. The welding mark formed by the ultrasonic welding head 131 on the tab group 211 falls into And fill the area 2111 to be welded.

The end face 1311 of the ultrasonic welding head of the welding mechanism 13 has the same shape and the same area as the end face 1111 of the first pressing member, so as to ensure that the first pressing member 111 can more accurately position the area 2111 to be welded and to more accurately ensure that the area to be welded is The area of the region 2111 is thus reduced as much as possible while ensuring the welding area of the tab group 211, thereby reducing the weight of the battery cell 200 while ensuring the stability of the performance of the battery cell 200.

According to some embodiments of the present application, the positioning mechanism 11 further includes a second pressing member 113 , and the second pressing member 113 is used to cooperate with the first pressing member 111 to clamp the tab group 211 .

That is to say, the positioning mechanism 11 includes a first pressing member 111 and a second pressing member 113. The first pressing member 111 and the second pressing member 113 can move toward each other along the stacking direction of each tab of the tab group 211. , so as to clamp the tab group 211 between the first pressing member 111 and the second pressing member 113 , and at the same time, the contact surface between the first pressing member 111 and the tab group 211 defines the area to be welded 2111 .

It can be understood that the positioning mechanism 11 may also include a second telescopic driving member 114. The second telescopic driving member 114 drives the second pressing member 113 to expand and contract along the second direction Y, so that the second pressing member 113 is in contact with the first pressing member. The fasteners 111 move toward or away from each other.

Among them, the second telescopic driving member 114 can use conventional linear driving mechanisms such as servo electric cylinders, air cylinders, and linear modules. Of course, the first telescopic driving member 112 and the second telescopic driving member 114 can also be an integrated structure, such as a two-way screw rod. The first pressing member 111 and the second pressing member 113 are respectively installed on the two driving nuts of the two-way screw rod.

The area of the contact surface between the second pressing member 113 and the tab group 211 may be greater than or equal to the area of the contact surface between the first pressing member 111 and the tab group 211. Along the stacking direction of each tab, the first pressing member The projection of the contact surface between the member 111 and the tab group 211 and the projection of the contact surface between the second pressing member 113 and the tab group 211 may partially overlap.

The positioning mechanism 11 includes a first pressing member 111 and a second pressing member 113 that cooperate with each other to conveniently and stably position the tab group 211 between the first pressing member 111 and the second pressing member 113. At the same time, the The arrangement of the first pressing member 111 and the second pressing member 113 facilitates flexible adjustment of the aggregation position of the tab group 211, thereby facilitating the flexible positioning of the tab group 211 in the tab stacking direction according to the different structural requirements of the electrode assembly 210. Both sides or any middle position, it has strong flexibility and versatility.

According to some further embodiments of the present application, please refer to Figure 7. Figure 7 is a structural front view of the welding mechanism of the welding device provided in some further embodiments of the present application in a state in which the tab set is aligned. The welding device 10 also includes a replacement mechanism 14, The exchange mechanism 14 is used to exchange the positions of the welding mechanism 13 and the first pressing member 111 .

That is to say, the welding device 10 is provided with an exchange mechanism 14 that can exchange the positions of the welding mechanism 13 and the first pressing member 111, so that the first pressing member 111 and the welding mechanism 13 can act on the electrode assembly 210 in sequence, which facilitates the replacement of the welding mechanism 13 with the first pressing member 111. Under the premise of moving the electrode assembly 210, the positioning of the area to be welded 2111 of the tab group 211, the cutting of the excess portion 2112, and the welding with the adapter 220 are completed in sequence, which effectively improves the integration of the overall welding device 10.

There are many implementation structures of the exchange mechanism 14, as long as the position exchange function of the first pressing member 111 and the welding mechanism 13 can be realized. For example, the exchange mechanism 14 can be a closed-loop crawler track. The first pressing member 111 and the welding mechanism 13 are installed on the crawler track and distributed on opposite sides of the closed-loop crawler track. The closed-loop crawler track drives the first pressing member 111 and the welding mechanism 13 to follow the crawler track. Rotate to change positions.

The welding device includes an exchange mechanism 14 that can exchange the positions of the welding mechanism 13 and the first pressing member 111. The exchange mechanism 14 is arranged to facilitate positioning, cutting and welding of the tab assembly 211 without moving the electrode assembly 210. This reduces the switching time of the electrode assembly 210 between work stations and improves battery production efficiency; more importantly, it can effectively reduce the risk of bending and deformation of the tab set 211 of the electrode assembly 210 due to transportation, repositioning, etc. This further improves the production yield and performance stability of the battery.

According to some embodiments of the present application, please continue to refer to Figure 7. The exchange mechanism 14 includes a rotating member 142 and a driving member 141. The driving member 141 is used to drive the rotating member 142 to rotate; wherein, the welding mechanism 13 and the first pressing member 111 are installed on the rotating member 142 and located on both sides of the rotation center line of the rotating member 142 .

The rotating member 142 can be in any shape, such as disc shape, strip shape, rectangle, ellipse, etc. The driving member 141 may be a commonly used rotational driving mechanism, such as a motor, and a reducer may be disposed between the motor and the rotating member 142. The reducer may be any conventionally used reducer structure.

The welding mechanism 13 and the first pressing member 111 are installed on the rotating member 142 and are located on both sides of the rotation center line of the rotating member 142. The driving member 141 drives the rotating member 142 to rotate at a certain angle, so that the welding mechanism 13 and the first pressing member 111 can be pressed. The position of piece 111 is reversed.

The arrangement of the rotating member 142 is convenient for driving the first pressing member 111 and the welding mechanism 13 to work on the electrode assembly 210 in sequence, and completing the shaping operation of the tab group 211 of the electrode assembly 210 as well as the tab group 211 and the adapter 220 at the same work station. welding operations.

According to some further embodiments of the present application, please continue to refer to Figure 7, and further refer to Figure 8. Figure 8 is a structural front view of a welding device provided in some further embodiments of the present application. The welding device 10 also includes a connecting mechanism 15. The connecting mechanism 15 is configured to connect the cut edges of each tab in the tab group 211 to each other.

As mentioned above, there are many ways to connect the cut edges of each tab of the tab set 211 to each other. Correspondingly, the connection mechanism 15 can also have multiple implementation structures. For example, the connection mechanism 15 can be made of glue. The glue outlet of the glue gun is aligned with the cut edge of each pole and moves a certain distance around the edge, so that the cut edges of each pole are bonded together through colloid. The connection mechanism 15 may also be a welding machine, through which the cut edges of each tab are welded, and so on.

The welding device 10 includes a connecting mechanism 15 that connects the cut edges of the tabs of the tab set 211 to each other, so that the cut tabs of the tab set 211 are kept in a state of convergence and aggregation with each other.

According to some embodiments of the present application, the connection mechanism 15 is configured to heat-melt the cut edges of each tab in the tab group 211 so that each tab in the tab group 211 is connected to each other.

"Hot melting the edges of each tab after cutting" refers to using processing techniques such as laser welding and heating electrodes to heat and melt the cut edges of each tab, and the melted parts of each tab gather with each other, making each pole The cut edges of the tabs can be connected to each other after cooling. Correspondingly, the connection mechanism 15 can include a driving mechanism and a heating electrode driven by the driving mechanism. The driving mechanism drives the heating electrode around each tab of the tab group 211 after cutting. The edge movement is such that the cut edges of each tab are melted to a certain extent, and finally the tabs are connected to each other at the edges.

The connection mechanism heat-melts the cut edges of each tab of the tab set 211 so that the tabs are connected to each other. The cut edges of each tab of the tab set 211 can be repaired by hot-melt connection. , reducing the probability of metal burrs on the edge of the tab.

According to some embodiments of the present application, the connecting mechanism 15 is configured to apply glue to the cut edges of each tab in the tab set 211 so that the tabs in the tab set 211 are bonded to each other.

The colloid can be conductive glue or other conventional colloid that can bond metal. For example, hot melt glue can be used to bond the cut edges of each tab to each other. Correspondingly, the connection mechanism 15 can include a three-dimensional driving mechanism. , the second rotary driving part 151 and the hot melt glue gun 152. The second rotary driving part 151 is installed at the execution end of the three-dimensional driving mechanism. The hot melt glue gun 152 is installed at the execution end of the second rotation driving part 151. The three-dimensional driving mechanism drives The hot melt glue gun 152 moves around the cut edge of each tab of the tab group 211 in the plane of the first direction X and the third direction Z. During this process, the hot melt glue gun 152 dissolves under the action of heat. The hot melt glue in a liquid state is coated on the cut edges of each tab of the tab group 211. After the hot melt glue cools, the bonding of the cut edges of each tab is completed, and the second rotation driving member 151 can drive the hot melt glue gun 152 to change its own gluing direction while moving along the gluing track.

In some embodiments, as shown in Figure 8, based on the implementation form of "the cutting mechanism 12 includes a three-dimensional driving member 122, a first rotational driving member 123 and a cutting member 121", the connecting mechanism 15 and the cutting mechanism 12 can adopt the same The three-dimensional driving member 122, specifically, two third telescopic driving members 1221 are installed side by side on the execution end of the three-dimensional driving member 122. The first rotating driving member 123 and the second rotating driving member 151 are respectively installed on the two third telescopic driving members. At the execution end of 1221, when the cutting piece 121 cuts the tab set 211, the hot melt glue gun 152 is in a retracted state to avoid interference with the cutting piece 121, and when the hot melt glue gun 152 cuts the tab set 211 When 211 is applying glue, the cutting piece 121 is in a retracted state to avoid interference with the hot melt glue gun 152.

The connecting mechanism coats the cut edges of each tab of the tab set 211 with colloid, so that the cut edges of each tab of the tab set 211 are bonded to each other through the colloid, and is operated by colloid bonding. It is simple and not easy to cause damage to the tabs, effectively ensuring its connection yield and strong practicability; at the same time, the colloid can cover and bond undesirable parts such as metal burrs or cracks that may exist on the edges of the tabs, improving cutting efficiency. The structural strength of the rear tab edge is improved and the probability of metal burrs on the tab edge is reduced.

According to some embodiments of the present application, the welding device 10 further includes a dust suction mechanism 16 , which is used to absorb dust generated when the cutting mechanism 12 cuts the tab set 211 .

The dust suction mechanism refers to a structure that uses the principle of negative pressure to absorb dust. The dust suction mechanism 16 can use any dust suction equipment available on the market and can absorb and process the dust generated when cutting the tab assembly 211. This application The structure of the dust collecting mechanism 16 is not uniquely limited.

The welding device is equipped with a dust suction mechanism 16 to absorb the dust generated when cutting the tab assembly 211, thereby reducing the risk of metal debris and dust generated during cutting of the tab assembly 211 entering the inside of the tab or the main body of the electrode assembly 210, thereby effectively avoiding Metal debris causes battery short circuit abnormalities, thereby effectively improving the performance stability and safety of the battery.

According to some embodiments of the present application, the present application also provides a battery manufacturing equipment 100, including the welding device 10 as described in any of the above solutions.

According to some embodiments of the present application, please continue to refer to FIG. 8 , the battery manufacturing equipment 100 further includes a separator 20 for isolating the main body of the electrode assembly 210 from the welding device 10 , and the separator 20 has a supply lug set. 211 through the opening 22.

It can be understood that the separator 20 is disposed between the main body of the electrode assembly 210 and the welding device 10. There are many implementation structures of the separator 20. For example, the separator 20 can be in the shape of a plate, and the separator 20 is provided with a thickness along its thickness. The main body of the electrode assembly 210 is located on one side of the separator 20 in the thickness direction. The tab set 211 of the electrode assembly 210 protrudes from the main body of the electrode assembly 210 through the opening and extends to the thickness direction of the separator 20 . The other side.

In other embodiments, the isolator 20 may also include two sub-isolated parts 21 that can move toward each other along the stacking direction of each tab of the tab set 211. The two sub-isolated parts 21 move toward each other to separate the loose tab group 211. It is gathered and aggregated along its stacking direction, and is clamped between two sub-isolation members 21. The above-mentioned opening 22 is formed between the two sub-isolation members 21. The two sub-isolation members 21 separate the main body of the electrode assembly 210 and the terminal part of the tab group 211. The welding area separates the main body of the electrode assembly 210 from the welding mechanism 13. At the same time, the spacer 20 with this structure plays a gathering and auxiliary limiting role for the tab group 211, effectively improving the positioning mechanism 11 in the tab group 211. This makes it convenient to locate the area to be welded 2111 and improves the positioning accuracy of the area to be welded 2111.

The battery manufacturing equipment 100 includes a separator 20 for isolating the main body of the electrode assembly 210 from the welding device 10. The arrangement of the separator 20 can effectively reduce the welding slag generated when the tab set 211 is welded to the adapter 220 from entering the main body of the electrode assembly 210. This effectively reduces the risk of short circuiting the battery due to metal welding slag, thereby effectively improving the performance stability and safety of the battery.

Please refer to Figures 5 to 8. Some embodiments of the present application provide a battery manufacturing equipment 100. The battery manufacturing equipment 100 includes a welding device 10 and a separator 20. The welding device 10 is used to connect the tab group 211 of the electrode assembly 210. Welded with the adapter 220, the welding device 10 includes a positioning mechanism 11, a cutting mechanism 12, a welding mechanism 13, a connecting mechanism 15, and a switching mechanism 14. The positioning mechanism 11 is used to position the tab group 211 of the electrode assembly 210 to be welded. Area 2111, the cutting mechanism 12 is used to cut the tab group 211 to remove the excess part 2112 around the area 2111 to be welded; the connecting mechanism 15 is used to connect the cut edges of each tab in the tab group 211 to each other, The welding mechanism 13 is used to weld the tab group 211 with the edges of the tabs connected to each other and the adapter 220 ; the spacer 20 is used to separate the main body of the electrode assembly 210 from the welding device 10 .

The positioning mechanism 11 includes a first pressing member 111, a first telescopic driving member 112, a second pressing member 113 and a second telescopic driving member 114. The first pressing member 111 is installed at the output end of the first telescopic driving member 112. The first telescopic driving member 112 drives the first pressing member 111 to expand and contract along the stacking direction of each tab of the tab group 211 (the second direction Y shown in the figure), and the second pressing member 113 is installed on the second telescopic driving member. The output end of the member 114, the second telescopic driving member 114 drives the second pressing member 113 to expand and contract along the stacking direction of each tab of the tab group 211 (the second direction Y shown in the figure), the first pressing member 111 and second pressing members 113 are distributed on opposite sides of the tab group 211 along the second direction Y. The first telescopic driving member 112 and the second telescopic driving member 114 drive the first pressing member 111 and the second pressing member. 113 move toward each other to clamp each tab of the tab group 211 between the first pressing member 111 and the second pressing member 113 so that the tabs in the tab group 211 converge with each other. The contact surface between the fastener 111 and the tab group 211 is the area to be welded 2111.

The cutting mechanism 12 includes a three-dimensional driving member 122, a first rotating driving member 123, a cutting member 121 and a third telescopic driving member 1221. The connecting mechanism 15 includes a three-dimensional driving member 122, a second rotating driving member 151 and a hot melt glue gun 152. , two third telescopic driving parts 1221 are installed side by side on the execution end of the three-dimensional driving part 122, the first rotation driving part 123 and the second rotation driving part 151 are respectively installed on the execution ends of the two third telescopic driving parts 1221, and the cutting part 121 is installed at the execution end of the first rotary driving member 123, and the hot melt glue gun 152 is installed at the execution end of the second rotation driving member 151. The three-dimensional driving member 122 drives the cutting member 121 and the hot melt glue gun 152 to expand and contract along the second direction Y to approach or move away from the tab group 211. At the same time, the three-dimensional driving member 122 drives the cutting member 121 and the hot melt glue gun 152 in the first direction X and The third direction Z moves in the plane, so that the cutting piece 121 and the hot melt glue gun 152 move along the cutting and gluing trajectory, and the first rotary driving member 123 can drive the cutting piece 121 to move along the cutting trajectory. The second rotary driving member 151 can drive the hot melt glue gun 152 to change its own gluing direction while moving along the gluing track.

Because of the arrangement of the third telescopic driving member 1221, when the cutting member 121 cuts the tab assembly 211, the hot melt glue gun 152 is in a retracted state to avoid interference with the cutting member 121. When the hot melt glue gun 152 When applying glue to the tab assembly 211, the cutting piece 121 is in a retracted state to avoid interference with the hot melt glue gun 152.

The welding mechanism 13 includes an ultrasonic welding head 131. The end surface of the first pressing member 111 and the end surface of the ultrasonic welding head 131 have the same shape and the same area.

The switching mechanism 14 includes a motor and a turntable driven to rotate by the motor. The first telescopic member and the three-dimensional drive are installed on the same side of the turntable. At the same time, the ultrasonic welding head 131 is installed on the other side of the rotation center line of the turntable.

The isolation member 20 includes two sub-isolation members 21 that can move toward each other along the third direction Z. The two sub-isolation members 21 move toward each other, gather and aggregate the loose tab groups 211 along their stacking direction, and clamp them between the two sub-isolation members 21 The above-mentioned opening 22 is formed between the two sub-isolators 21, which separate the main body of the electrode assembly 210 and the area to be welded 2111 of the tab group 211, that is, the main body of the electrode assembly 210 and the welding mechanism 13 are separated. .

It should be noted that, as long as there is no conflict, the features in the embodiments of this application can be combined with each other.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for components thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A welding method for welding the tab set of the electrode assembly to the adapter, wherein the welding method includes:

Locate the area to be welded of the tab group;

Cut the tab set and remove excess parts around the area to be welded;

Weld the cut tab set and the adapter piece.
The welding method according to claim 1, wherein positioning the area to be welded of the tab group includes:

The first pressing member is used to limit the tab group so that the tabs in the tab group converge with each other. The contact surface between the first pressing member and the tab group is the area to be welded. .
The welding method according to claim 1 or 2, wherein after cutting the tab group, the welding method further includes: connecting the cut edges of each tab in the tab group to each other.
The welding method according to claim 3, wherein connecting the cut edges of each tab in the tab group to each other includes:

The cut edges of the respective tabs are heat-fused to each other.
The welding method according to claim 3, wherein connecting the cut edges of each tab in the tab group to each other includes:

The cut edges of the tabs are bonded to each other through colloid.
A welding device used to weld the tab set of the electrode assembly to the adapter, including:

A positioning mechanism used to position the area to be welded of the tab group of the electrode assembly;

A cutting mechanism, used to cut the tab group and remove excess parts around the area to be welded;

A welding mechanism is used to weld the cut tab set and the adapter.
The welding device according to claim 6, wherein the positioning mechanism includes a first pressing member, the first pressing member is used to press the tab group so that each pole in the tab group The ears are aggregated with each other, and the contact surface between the first pressing member and the tab group is the area to be welded.
The welding device according to claim 7, wherein the welding mechanism includes an ultrasonic welding head, and the end surface of the first pressing member and the end surface of the ultrasonic welding head have the same shape and the same area.
The welding device according to claim 7 or 8, wherein the positioning mechanism further includes a second pressing member, the second pressing member is used to cooperate with the first pressing member to clamp the tab Group.
The welding device according to any one of claims 7 to 9, wherein the welding device further includes:

An exchange mechanism is used to exchange the positions of the welding mechanism and the first pressing member.
The welding device according to claim 10, wherein the exchange mechanism includes:

rotating parts;

A driving member used to drive the rotating member to rotate;

Wherein, the welding mechanism and the first pressing member are installed on the rotating member and are located on both sides of the rotation center line of the rotating member.
The welding device according to any one of claims 6 to 11, wherein the welding device further includes:

A connecting mechanism configured to connect the cut edges of each tab in the tab group to each other.
The welding device according to claim 12, wherein the connecting mechanism is configured to heat-melt the cut edges of each tab in the tab group, so that each tab in the tab group Connect with each other.
The welding device according to claim 12, wherein the connecting mechanism is configured to apply colloid to the cut edge of each tab in the tab group, so that each pole in the tab group The ears are bonded to each other.
The welding device according to any one of claims 6 to 14, wherein the welding device further includes:

A dust suction mechanism is used to absorb dust generated when the cutting mechanism cuts the tab assembly.
A battery manufacturing equipment including the welding device according to any one of claims 6 to 15.
The battery manufacturing equipment according to claim 16, wherein the battery manufacturing equipment further includes:

A spacer is used to separate the main body of the electrode assembly from the welding device, and the spacer has an opening for the tab group to pass through.