Ultrasonic welding device
By adding elastic plastic parts to the ultrasonic welding device, pre-pressing and bending the battery cell ears, and using the elasticity of the plastic parts to reduce the tensile force of the ears, the problem of fracture of the ears during welding is solved, and product quality and user experience are improved.
Patent Information
- Application Number
- CN202422122514.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-29
AI Technical Summary
During ultrasonic welding, the roots of the battery cell ears are prone to tension and fracture, which leads to the battery module being easily broken during installation and use, affecting product quality and production efficiency.
An ultrasonic welding device is designed to increase elastic plastic parts, and a plastic part is arranged between the welding component and the battery core body, so that its part is located between the welding surface, pre-press the bent electrode, and the tensile force of the electrode ear is reduced through the elasticity of the plastic part during welding.
It effectively reduces the stress rebound of the extreme ear during welding, significantly reduces the risk of extreme ear fracture, and also reduces the possibility of extreme ear fracture during subsequent installation and use, improving user experience and product quality.
Smart Images
Figure CN222985952U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of welding, and specifically relates to an ultrasonic welding device. Background Art
[0002] A battery module usually includes multiple battery cells, and each battery cell includes a cell body and multiple layers of tabs. To ensure good electrical connection and stability of the battery module, the ultrasonic welding method is usually used to weld the multiple layers of tabs together. The ultrasonic welding of the battery cell tabs utilizes high-frequency vibration waves transmitted to the surfaces of the multiple layers of metal tabs to be welded. Under the condition of pressure applied by the welding head and the welding base, the surfaces of the multiple layers of metal tabs rub against each other to form a fusion between the molecular layers, thereby welding the multiple layers of tabs together. However, at present, the problem of tensile fracture easily occurs at the root of the tabs during ultrasonic welding. Summary of the Utility Model
[0003] In view of this, this application provides an ultrasonic welding device. The ultrasonic welding device is applied to the welding of battery cells. Each battery cell includes a cell body and multiple layers of tabs. The ultrasonic welding device is used to weld the multiple layers of tabs. The ultrasonic welding device includes:
[0004] A welding assembly, the welding assembly includes a welding head and a welding base. The welding head has a first welding surface facing the welding base, and the welding base has a second welding surface facing the welding head. Multiple tabs can be arranged between the first welding surface and the second welding surface;
[0005] A shaping member, the shaping member is arranged between the welding assembly and the cell body. A part of the shaping member is arranged between the plane where the first welding surface is located and the plane where the second welding surface is located. The shaping member has elasticity.
[0006] In the ultrasonic welding device provided by this application, a shaping member is added between the welding assembly, that is, the welding head and the welding base, and the cell body. Since a part of the shaping member is located between the plane where the first welding surface is located and the plane where the second welding surface is located, the shaping member first contacts the tab during welding, pre-presses and bends the tab to facilitate welding, and the shaping member has elasticity, which can avoid damaging the tab when the shaping member abuts against the tab during the pressing process.
[0007] At the same time, since the shaping member presses the tab to a bent state rather than a stretched and tightened state, and the shaping member that presses the tab to a bent state and abuts against the tab has elasticity, there is a certain bending deformation space for the tab during ultrasonic welding vibration. At the same time, the shaping member abutting against the tab has elasticity and can deform synchronously with the bending deformation of the tab, so that the tensile force borne by the tab is smaller than that in the related art, effectively reducing the stress rebound of the tab during welding, and thus significantly reducing the risk of tab fracture.
[0008] Furthermore, since the tabs are still in a bent state after welding, the problem of tab breakage due to tab bending or vibration during installation or use of the battery module is reduced, thereby improving the user experience.
[0009] In summary, the ultrasonic welding device provided in this embodiment is provided with an elastic shaping piece, which pre-bends the tab before the welding head and the welding seat contact the tab, so that the tab has a certain bending and deformation space during the welding process, reduces the tensile force of the tab pressed by the welding head and the welding seat and the tab during the welding process, reduces stress rebound, and thus reduces the risk of tab breakage. At the same time, the bent tab after welding also reduces the risk of tab breakage during subsequent installation and use.
[0010] Wherein, the shaping piece is fixed to a side of the welding assembly close to the battery cell body.
[0011] Among them, when the pole lugs among the multiple pole lugs close to the welding seat abut against the second welding surface, and the pole lugs among the multiple pole lugs close to the welding seat are parallel to the second welding surface, the shaping member is fixed to the side of the welding head close to the battery cell body, and part of the shaping member protrudes from the first welding surface.
[0012] Among them, when the pole lug close to the welding head among the multiple pole lugs abuts against the first welding surface, and the pole lug close to the welding seat among the multiple pole lugs is parallel to the second welding surface, the shaping piece is fixed to a side of the welding seat close to the battery cell body, and part of the shaping piece protrudes from the second welding surface.
[0013] Among them, the number of the shaping pieces is two, one of the shaping pieces is fixed to the side of the welding head close to the battery cell body, and a part of the shaping piece protrudes from the first welding surface; the other shaping piece is fixed to the side of the welding seat close to the battery cell body, and a part of the shaping piece protrudes from the second welding surface.
[0014] Wherein, the shaping member comprises a shaping portion, the shaping portion has a shaping surface for resisting the pole ear, and the shaping surface is arc-shaped.
[0015] The shaping surface includes a first surface and two second surfaces bent and connected to opposite sides of the first surface. The first surface is a plane, and the second surface is a curved surface.
[0016] The pole ear includes a first end close to the battery cell body and a second end away from the battery cell body, and the shaping member is closer to the first end than the second end and is disposed with a gap from the first end.
[0017] Among them, when the welding head, the welding seat, and the shaping member cooperate with each other to weld a plurality of the tab ears, the shaping member is disposed outside the plane where the first welding surface is located and the plane where the second welding surface is located.
[0018] Among them, the shaping member includes a silicone shaping member, a rubber shaping member, or a polyurethane shaping member. Description of the Drawings
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.
[0020] Figure 1 It is a schematic diagram of an ultrasonic welding device in an embodiment of the present application.
[0021] Figure 2 It is Figure 1 a schematic diagram when the ultrasonic welding device shown cooperates with the battery cell.
[0022] Figure 3 It is Figure 2 a schematic diagram when the ultrasonic welding device shown welds the battery cell.
[0023] Figure 4 It is a schematic diagram of an ultrasonic welding device in another embodiment of the present application.
[0024] Figure 5 It is Figure 4 a schematic diagram when the ultrasonic welding device shown cooperates with the battery cell.
[0025] Figure 6 It is Figure 5 a schematic diagram when the ultrasonic welding device shown welds the battery cell.
[0026] Figure 7 It is a schematic diagram of an ultrasonic welding device in yet another embodiment of the present application.
[0027] Figure 8 It is Figure 7 a schematic diagram when the ultrasonic welding device shown cooperates with the battery cell.
[0028] Figure 9 It is Figure 8 a schematic diagram when the ultrasonic welding device shown welds the battery cell.
[0029] Figure 10 It is Figure 8 a partial enlarged view of the ultrasonic welding device shown.
[0030] Figure 11 It is Figure 10 a partial enlarged view of the ultrasonic welding device shown.
[0031] Figure 12 is Figure 9 a partial enlarged view of the ultrasonic welding device shown in the figure.
[0032] Reference numeral description: Ultrasonic welding device - 1, battery module - 2, battery cell - 3, battery cell body - 4, tab - 5, welding assembly - 10, welding head - 11, first welding surface - 110, welding head teeth - 111, welding head body - 112, welding base - 12, second welding surface - 120, welding base teeth - 121, welding base body - 122, shaping part - 20, shaping portion - 21, shaping surface - 210, first surface - 211, second surface - 212, first end - 50, second end - 51. Specific embodiments
[0033] The following are the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and refinements can still be made, and these improvements and refinements are also regarded as the protection scope of the present application.
[0034] Before introducing the technical solutions provided by the present application, the technical problems in the related art will be introduced in detail.
[0035] With the rapid development of the battery industry, the demand for batteries is also increasing continuously. For example, multiple battery cells need to be connected in parallel or in series to form a battery module so that the battery module can output a higher voltage or a larger current. A battery module usually includes multiple battery cells and multiple layers of tabs. Usually, the ultrasonic welding method is used to weld the multiple layers of tabs together to ensure that the obtained battery module has good electrical connection and stability. Ultrasonic welding of battery cell tabs is to transmit high-frequency vibration waves to the surfaces of the multiple layers of metal tabs to be welded. Under the condition that the welding head and the welding base apply pressure, the surfaces of the multiple layers of metal tabs rub against each other to form a fusion between the molecular layers. Ultrasonic welding is a solid-phase welding method, and the connection between the welded parts is realized through the physical action of the base material and the molecules.
[0036] However, currently, during the ultrasonic welding process of ultra-thick battery cell tabs, the welding head and the welding base clamp the tabs and then perform ultrasonic welding. Since the welding head presses directly downwards, the tabs are stretched to be taut during the pressing process, and the outermost tab bears the greatest tensile force, resulting in the situation that the tab root is prone to stress rebound and the tab is stretched and broken during the downward pressing of the welding head or the up-and-down vibration during welding. At the same time, since the tabs are in a stretched and taut state after welding, the tab root is prone to breakage due to the bending or vibration of the tabs during the subsequent installation of the battery module and the use of the battery module, seriously affecting the product quality and production efficiency.
[0037] In view of this, to solve the above problems, the present application provides an ultrasonic welding device. Please refer to Figures 1 - 3 , Figure 1 which is a schematic diagram of the ultrasonic welding device in an embodiment of the present application. Figure 2 is Figure 1 a schematic diagram when the ultrasonic welding device shown cooperates with the battery cell. Figure 3 is Figure 2 a schematic diagram when the ultrasonic welding device shown welds the battery cell. Among them Figure 3 is the process of the ultrasonic welding device bending the tab, not the final form after welding is completed.
[0038] The ultrasonic welding device 1 provided in this embodiment is applied to the welding of the battery cell 3. The battery cell 3 includes a battery cell body 4 and multiple layers of tabs 5. The ultrasonic welding device 1 is used to weld the multiple layers of tabs 5. The ultrasonic welding device 1 includes a welding assembly 10 and a shaping member 20. The welding assembly 10 includes a welding head 11 and a welding base 12. The welding head 11 has a first welding surface 110 facing the welding base 12. The welding base 12 has a second welding surface 120 facing the welding head 11. Multiple tabs 5 can be arranged between the first welding surface 110 and the second welding surface 120. The shaping member 20 is arranged between the welding assembly 10 and the battery cell body 4. The shaping member 20 is partially arranged between the plane where the first welding surface 110 is located and the plane where the second welding surface 120 is located. The shaping member 20 has elasticity.
[0039] The ultrasonic welding device 1 provided in this embodiment is mainly applied to the welding of the tabs 5 of the ultra-thick battery cell 3. The battery cell 3 usually includes a battery cell body 4 and multiple layers of tabs 5. The ultrasonic welding device 1 welds the multiple layers of tabs 5 of the battery cell 3 together to ensure that the battery module 2 composed of multiple battery cells 3 has good electrical connection and stability.
[0040] The ultrasonic welding device 1 mainly includes a welding assembly 10 and a shaping member 20. The welding assembly 10 includes a welding head 11 and a welding base 12. The welding head 11 is a component that applies pressure to the tab 5 and conducts vibration energy to the tab 5 during the welding process. The welding base 12 is a component that bears the tab 5 during the welding process. The welding head 11 and the welding base 12 are usually arranged oppositely during the welding process. For example, usually the welding head 11 is arranged above the welding base 12. Then, at this time, the surface of the welding head 11 facing the welding base 12, that is, the lower surface of the welding head 11, is the first welding surface 110. The surface of the welding base 12 facing the welding head 11, that is, the upper surface of the welding base 12, is the second welding surface 120.
[0041] The battery cell 3 is usually disposed on the support table. The multiple tabs 5 of the battery cell 3 extend from the same side of the battery cell 3 towards the welding device. During welding, the multiple tabs 5 are disposed between the first welding surface 110 and the second welding surface 120. Subsequently, the welding base 12 and the battery cell 3 usually remain fixed. The welding head 11 approaches the welding base 12, that is, the welding head 11 presses downwards, so that the lowermost tab 5 abuts against the welding base 12, and the welding head 11 abuts against the uppermost tab 5. The welding base 12 and the welding head 11 cooperate to clamp the tab 5, and then the welding head 11 performs high-speed up-and-down vibration, that is, ultrasonic welding, so as to weld the tabs 5 between the welding head 11 and the welding base 12 into a whole.
[0042] Optionally, the welding head 11 includes a welding head body 112 and welding head teeth 111. The welding head teeth 111 are mainly used to transfer the vibration energy of the welding head 11 to the tab 5 to be welded. At this time, the surface of the welding head teeth 111 facing away from the welding head body 112, that is, the lower surface of the welding head teeth 111, is the first welding surface 110. The welding base 12 includes a welding base body 122 and welding base teeth 121. The welding base teeth 121 are mainly used to clamp and fix the tab 5. At this time, the surface of the welding base teeth 121 facing away from the welding base body 122, that is, the upper surface of the welding base teeth 121, is the second welding surface 120.
[0043] During welding, when the welding head 11 presses down, the welding head teeth 111 and the welding base teeth 121 can increase the pressure on the contact surface between the welding head 11 and the welding base 12 and the tab 5, so that the welding head 11 and the welding base 12 press the tab 5 tighter and the welding effect is better. At the same time, the welding head teeth 111 and the welding base teeth 121 also increase the friction between the tab 5 and the welding head 11 and the welding base 12, preventing the tab 5 from shifting during welding. The main function of the welding head teeth 111 is to transfer vibration energy, while the function of the welding base teeth 121 is mainly to fix the tab 5. Therefore, the main functions of the welding head teeth 111 and the welding base teeth 121 are different and their shapes are also different. The density of the welding base teeth 121 is usually greater than that of the welding head teeth 111.
[0044] The shaping member 20 is a component that abuts against the tab 5 during welding and bends the tab 5 into a predetermined shape. The shaping member 20 is disposed between the welding assembly 10 and the battery cell body 4, and a part of the shaping member 20 exists between the plane where the first welding surface 110 is located, that is, the plane where the lower surface of the welding head 11 is located, and the plane where the second welding surface 120 is located, that is, the plane where the upper surface of the welding base 12 is located. That is to say, the shaping member 20 protrudes from the first welding surface 110 or the second welding surface 120, or the shaping member 20 protrudes from both the first welding surface 110 and the second welding surface 120 at the same time. The shaping member 20 is elastic, that is, the shaping member 20 can undergo a certain degree of deformation when abutting against the tab 5. As for the specific fixing position and method of the shaping member 20, this application will be introduced later.
[0045] During the downward pressing process of the welding head 11 during welding, since a part of the shaping member 20 is located between the plane where the first welding surface 110 is located and the plane where the second welding surface 120 is located, the shaping member 20 first contacts the tab 5, pre-bends the tab 5 into place for welding, and the shaping member 20 is elastic, which can avoid damaging the tab 5 when the shaping member 20 abuts against the tab 5 during the downward pressing process.
[0046] At the same time, since the shaping member 20 presses the tab 5 to be bent rather than in a stretched and taut state, and the shaping member 20 that presses the tab 5 to be bent and abuts against the tab 5 is elastic, there is a certain bending deformation space for the tab 5 during ultrasonic welding vibration. At the same time, the shaping member 20 abutting against the tab 5 is elastic and can deform synchronously with the bending deformation of the tab 5, so that the tensile force borne by the tab 5 is smaller than that in the related art, effectively reducing the stress rebound of the tab 5 during welding, and then significantly reducing the risk of the tab 5 breaking.
[0047] Moreover, since the welded position of the tab 5 is fixed after welding, even without the shaping member 20 abutting, the tab 5 is still in a bent state after welding, rather than in a stretched and taut state in the related art. Therefore, the problem of the tab 5 breaking due to the tab 5 being bent or vibrated during the installation or use of the battery module 2 is also reduced, improving the user experience.
[0048] Through experimental verification, when using the ultrasonic welding device 1 in this embodiment to weld the tabs 5 of the ultra-thick battery cell 3, under the same welding process parameters, the fracture ratio of the tabs 5 is reduced from 20% of the traditional welding device to less than 1%, greatly improving the production yield of the battery, enhancing the product quality and stability, contributing to improving the production efficiency, and being suitable for large-scale industrial production.
[0049] In summary, the ultrasonic welding device 1 provided in this embodiment is provided with an elastic shaping member 20, which pre-bends the tab 5 before the welding head 11 and the welding seat 12 contact the tab 5, so that there is a certain bending deformation space for the tab 5 during the welding process, reducing the tensile force received by the tab 5 when the welding head 11 and the welding seat 12 press the tab 5 and during the welding process, reducing the stress rebound, and thus reducing the risk of the tab 5 breaking. At the same time, the bent tab 5 after welding also reduces the risk of the tab 5 breaking during subsequent installation and use.
[0050] Please refer to again Figure 1 In this embodiment, the shaping member 20 is fixed on the side of the welding assembly 10 close to the battery cell body 4.
[0051] On the basis that the shaping part 20 is arranged between the welding assembly 10 and the battery cell body 4, in this embodiment, the shaping part 20 can be fixed on the outer side surface of the welding assembly 10 close to the battery cell body 4, that is to say, the shaping part 20 is installed at the front end of the welding assembly 10, that is Figure 1 on the left side of the welding assembly 10 in Figure 1 . Optionally, the connection method between the shaping part 20 and the welding assembly 10, that is, the installation method of the shaping part 20, can be bolt fixation, slot connection, gluing, etc., and this embodiment does not limit it here.
[0052] Specifically, glue can be applied to the surface of the shaping part 20 close to the welding assembly 10. During installation, on the premise that part of the shaping part 20 is arranged between the plane where the first welding surface 110 is located and the plane where the second welding surface 120 is located, the shaping part 20 is pasted to the side of the welding assembly 10 close to the battery cell body 4 through the glue, so that the shaping part 20 is fixed to the surface of the welding assembly 10.
[0053] Certainly, in other embodiments, the shaping part 20 may not be fixed to the surface of the welding assembly 10, but arranged on other structures. For example, the shaping part 20 can be arranged on the support frame carrying the battery cell body 4.
[0054] In this embodiment, the shaping part 20 is fixed on the side of the welding assembly 10 close to the battery cell body 4, so that the shaping part 20 and the welding assembly 10 become an integral body. Furthermore, during welding, the shaping part 20 will not move relative to the welding assembly 10 or the ear 5, improving the stability of welding. At the same time, being fixed on the welding assembly 10 makes the position of the shaping part 20 fixed to the welding device. When replacing the battery cells 3 with different thicknesses, it is not necessary to readjust the position of the shaping part 20, making the welding process more continuous and convenient. The shaping part 20 has a clever structure design, relatively simple structure, low cost and controllability, and is very convenient to manufacture and install.
[0055] As can be seen from the above content, the shaping part 20 is fixed on the side of the welding assembly 10 close to the battery cell body 4. Due to the three placement methods of the battery cell 3 and the ear 5 relative to the welding assembly 10, the present application provides three ways to fix the shaping part 20, which will be introduced in detail one by one next.
[0056] Please refer to Figures 1 - 3 again. In this embodiment, when the ear 5 close to the welding base 12 among the plurality of ears 5 abuts against the second welding surface 120, and the ear 5 close to the welding base 12 among the plurality of ears 5 is parallel to the second welding surface 120, the shaping part 20 is fixed on the side of the welding head 11 close to the battery cell body 4, and part of the shaping part 20 protrudes from the first welding surface 110.
[0057] In one embodiment, when the tab 5 close to the welding seat 12 in the multi-layer tabs 5 abuts against the second welding surface 120, and at this time the tab 5 close to the welding seat 12 is parallel to the second welding surface 120, that is to say, when the welding head 11 and the welding seat 12 press the tab 5 tightly during welding, the lowermost tab 5 is pressed against the upper surface of the welding seat 12, and when the lowermost tab 5 is parallel to the upper surface of the welding seat 12, the shaping member 20 can be fixed on the side of the welding head 11 close to the battery cell body 4, that is, the shaping member 20 is fixed on Figure 2 the left side of the welding head 11 in
[0058] In this embodiment, when placing the battery cell 3 and inserting the tab 5 between the welding head 11 and the welding seat 12, the lowermost tab 5 can be made horizontal with the upper surface of the welding seat 12. When the welding head 11 and the welding seat 12 clamp the tab 5, the lowermost tab 5 is also horizontal with the upper surface of the welding seat 12 and will not be stretched and straightened. During welding, the tensile force on the tab 5 is small and it is not easy to break. At this time, the shaping member 20 can be arranged on the side of the welding head 11, that is, above the tab 5, to pre-press and shape the upper tab 5, so that the upper tab 5 will not be stretched and straightened like the lower tab 5, and the tab 5 is not easy to break during welding.
[0059] By installing the shaping member 20 on the side of the welding head 11 close to the battery cell body 4, the shaping member 20 can move up and down with the welding head 11, flexibly adjust the bending degree of the tab 5 when abutting against the tab 5, and can make the ultrasonic welding device 1 adapt to the situation where the lowermost tab 5 is horizontal with the upper surface of the welding seat 12. At the same time, only one shaping member 20 installed on the welding head 11 makes the installation of the shaping member 20 more concise and reduces the use cost of the shaping member 20.
[0060] Please refer to Figures 4 - 6 , Figure 4 which is a schematic diagram of the ultrasonic welding device in another embodiment of the present application. Figure 5 is Figure 4 a schematic diagram when the ultrasonic welding device shown cooperates with the battery cell. Figure 6 is Figure 5 a schematic diagram when the ultrasonic welding device shown welds the battery cell. Among them Figure 6 is the process of the ultrasonic welding device 1 bending the tab 5, not the final form after welding is completed. In this embodiment, when the tab 5 close to the welding head 11 among the multiple tabs 5 abuts against the first welding surface 110, and the tab 5 close to the welding seat 12 among the multiple tabs 5 is parallel to the second welding surface 120, the shaping member 20 is fixed on the side of the welding seat 12 close to the battery cell body 4, and a part of the shaping member 20 protrudes from the second welding surface 120.
[0061] In the second embodiment, when the tab 5 closest to the welding head 11 in the multi-layer tabs 5 abuts against the first welding surface 110, and at this time when the tab 5 closest to the head is parallel to the first welding surface 110, that is, when the welding head 11 and the welding base 12 press the tab 5 tightly during welding, the uppermost tab 5 is pressed against the lower surface of the welding head 11, and when the uppermost tab 5 is parallel to the upper surface of the welding head 11, the shaping member 20 can be fixed on the side of the welding base 12 close to the battery cell body 4, that is, the shaping member 20 is fixed in Figure 5 the left side of the welding base 12 in
[0062] In this embodiment, when placing the battery cell 3 and inserting the tab 5 between the welding head 11 and the welding base 12, when the welding head 11 and the welding base 12 clamp the tab 5, the uppermost tab 5 can be horizontal with the lower surface of the welding head 11 and will not be stretched and straightened. When welding, the tensile force on the tab 5 is small and it is not easy to break. At this time, the shaping member 20 can be arranged on the side of the welding base 12, that is, below the tab 5, to pre-press and shape the lower tab 5, so that the lower tab 5 will not be stretched and straightened like the upper tab 5, and the tab 5 will not be easy to break when welding.
[0063] By installing the shaping member 20 on the side of the welding base 12 close to the battery cell body 4, the shaping member 20 is fixed on the side of the welding base 12, so that the abutting effect of the shaping member 20 on the tab 5 is better, and the ultrasonic welding device 1 can adapt to the situation where the uppermost tab 5 is horizontal with the lower surface of the welding base 12. At the same time, only one shaping member 20 installed on the welding base 12 makes the installation of the shaping member 20 more concise and reduces the use cost of the shaping member 20.
[0064] Please refer to Figures 7 - 9 , Figure 7 which is a schematic diagram of the ultrasonic welding device in another embodiment of the present application. Figure 8 It is Figure 7 a schematic diagram when the ultrasonic welding device shown is cooperating with the battery cell. Figure 9 It is Figure 8 a schematic diagram when the ultrasonic welding device shown is welding the battery cell. Among them Figure 9 is the process of the ultrasonic welding device 1 bending the tab 5, not the final form after welding is completed. In this embodiment, the number of the shaping members 20 is two. One shaping member 20 is fixed on the side of the welding head 11 close to the battery cell body 4, and a part of one shaping member 20 protrudes from the first welding surface 110; the other shaping member 20 is fixed on the side of the welding base 12 close to the battery cell body 4, and a part of the other shaping member 20 protrudes from the second welding surface 120.
[0065] In the third embodiment, the number of the shaping members 20 may be two. The first shaping member is fixed to the side of the welding head 11 close to the battery cell body 4, and a part of the shaping member 20 protrudes from the first welding surface 110. The second shaping member is fixed to the side of the welding base 12 close to the battery cell body 4, and a part of the second shaping member protrudes from the second welding surface 120. That is to say, as Figure 8 shown, the shaping member 20 on the left side of the welding head 11 is the first shaping member, and the bottom of the first shaping member protrudes from the lower surface of the welding head 11. The shaping member 20 on the left side of the welding base 12 is the second shaping member, and the top of the second shaping member protrudes from the upper surface of the welding base 12.
[0066] In this embodiment, the two shaping members 20 are respectively arranged on the side of the welding head 11 close to the battery cell 3 and the side of the welding base 12 close to the battery cell 3, and the bottom of the first shaping member fixed on the welding head 11 protrudes from the lower surface of the welding head 11, and the top of the second shaping member fixed on the welding base 12 protrudes from the upper surface of the welding base 12. During the welding and pressing process, the upper and lower shaping members 20 simultaneously shape the tab 5, so that the upper tab 5 bends downward and the lower tab 5 bends upward. After the welding head 11 and the welding base 12 clamp the tab 5, due to the abutment of the upper and lower shaping members 20, both the upper and lower tabs 5 are in a bent state and have room for deformation, and the bending effect of the tab 5 is better, so that the tab 5 is not easily broken during the welding vibration process.
[0067] The above content has introduced in detail three specific fixing positions of the shaping member 20 of the present application fixed to the welding assembly 10. In addition to this, there are also some common structural and positional characteristics in the three embodiments. The present application will introduce them in detail one by one next. In addition, the following text of the present application only takes the ultrasonic welding device 1 shown in the third embodiment as an example for illustrative description.
[0068] Please refer to Figure 10 , Figure 10 as Figure 8 a partial enlarged view of the ultrasonic welding device shown. In this embodiment, the shaping member 20 includes a shaping portion 21, and the shaping portion 21 has a shaping surface 210 for abutting against the tab 5, and the shaping surface 210 is arc-shaped.
[0069] In this embodiment, a part of the shaping member 20 that contacts the tab 5 is the shaping portion 21, the surface of the shaping portion 21 that abuts against the tab 5 is the shaping surface 210, and the shaping surface 210 is an arc surface. By setting the shaping surface 210 as an arc, during the welding process when the welding head 11 presses down, the shaping member 20 abuts against the tab 5 and bends the tab 5 into an arc that fits the shaping surface 210. In other words, the shape of the shaping member 20 is adapted to the bending shape of the tab 5.
[0070] By setting the shaping surface 210 as an arc, that is, the shaping surface 210 has no sharp corners, the possibility of the shaping part 20 breaking the tab 5 when abutting against the tab 5 is reduced. At the same time, the arc design of the shaping surface 210 makes the shaping part 20 and the tab 5 fit more closely when the shaping part 20 abuts against the tab 5 and bends synchronously during the welding process, increasing the contact area, thereby reducing the pressure on the contact area between the shaping part 20 and the tab 5, and further reducing the risk of the shaping part 20 damaging the tab 5.
[0071] Please refer to Figure 11 , Figure 11 for Figure 10 the partial enlarged view of the ultrasonic welding device shown. In this embodiment, the shaping surface 210 includes a first surface 211 and two second surfaces 212 bent and connected to opposite sides of the first surface 211. The first surface 211 is a plane, and the second surface 212 is an arc surface.
[0072] In this embodiment, the shaping surface 210 can be divided into three parts, such as Figure 11 shown, the first surface 211 in the middle part, and two second surfaces 212 on both sides, where the first surface 211 is a plane and the second surface 212 is an arc surface.
[0073] The setting of the first surface 211 and the two second surfaces 212 makes the side of the welding surface a rounded rectangle, so that the shaping surface 210 has an arc shape adapted to the natural bending of the tab 5, making the shaping part 20 fit the tab 5 more closely, that is, making the bending shapes and degrees of the shaping part 20 and the tab 5 match, reducing the mutual pulling between the shaping part 20 and the tab 5, reducing the stress rebound of the tab 5, and further reducing the risk of the shaping part 20 causing the tab 5 to break and fracture. At the same time, the plane design of the first surface 211 enables the shaping part 20 to press the tab 5 tighter and bend it more in place when abutting against the tab 5, facilitating the subsequent ultrasonic welding of the tab 5.
[0074] Please refer to again Figure 2 , in this embodiment, the tab 5 includes a first end 50 close to the battery cell body 4 and a second end 51 away from the battery cell body 4. The shaping part 20 is closer to the first end 50 than the second end 51 and is arranged with a gap from the first end 50.
[0075] In this embodiment, the tab 5 protruding from the battery cell body 4 has two opposite ends: a first end 50 close to the battery cell body 4 and a second end 51 away from the battery cell body 4, that is, the root of the tab 5 is the first end 50, and the extended head of the tab 5 is the second end 51.
[0076] This embodiment can control the shaping piece 20 to be closer to the first end 50 than the second end 51, and a gap is set between the shaping piece 20 and the first end 50, that is, compared with the head extending from the pole ear 5, the shaping piece 20 is closer to the root of the pole ear 5, and there is a certain gap between the shaping piece 20 and the root of the pole ear 5, that is, the battery cell body 4.
[0077] The shaping piece 20 is closer to the root of the pole ear 5, that is, the shaping piece 20 will not be too far away from the battery body 4, so as to prevent the welding position from being too far away from the battery body 4, which makes the pole ear 5 too long and causes the battery cell 3 to be too large in size, which is inconvenient for subsequent installation. At the same time, there is a certain gap between the shaping piece 20 and the root of the pole ear 5, that is, the battery body 4, so that the shaping piece 20 will not be too close to the root of the pole ear 5 when it abuts against the pole ear 5, so that the bending angle of the root of the pole ear 5 will not be too large, and then the pole ear 5 will not be stretched and tightened, so as to prevent the shaping piece 20 from tearing the root of the pole ear 5 when it abuts against the pole ear 5.
[0078] Please refer to Figure 10 , Figure 12 , Figure 12 for Figure 9 In this embodiment, when the welding head 11, the welding seat 12, and the shaping member 20 cooperate with each other to weld the plurality of tabs 5, the shaping member 20 is disposed outside the plane where the first welding surface 110 and the plane where the second welding surface 120 are located.
[0079] In the present embodiment, when the welding head 11, the welding seat 12, and the shaping piece 20 cooperate with each other to press the shaping piece 20, the shaping piece 20, due to its elasticity, will be squeezed and compressed by the pressed pole ear 5, so that the part of the shaping piece 20 originally arranged between the plane where the first welding surface 110 is located and the plane where the second welding surface 120 is located is compressed to outside the plane where the first welding surface 110 is located and the plane where the second welding surface 120 is located, that is to say, the shaping piece 20 that was originally higher than the welding surface of the welding head 11 or the welding surface of the welding seat 12 is compressed to be lower than the welding surface of the welding head 11 or the welding surface of the welding seat 12.
[0080] By compressing the shaping piece 20, which was originally higher than the welding surface of the welding head 11 or the welding surface of the welding seat 12, to be lower than the welding surface of the welding head 11 or the welding surface of the welding seat 12, during the welding process, whether the shaping piece 20 continues to be compressed or restores its original shape, that is, when the welding head 11 vibrates up and down, the shaping piece 20 can be supported on the pole ear 5 due to its elasticity and will not be separated from the pole ear 5 due to vibration, so that the pole ear 5 always maintains a curved shape and has a certain deformation space, thereby preventing the pole ear 5 from breaking during the welding process.
[0081] In this embodiment, the shaping member 20 includes a silicone shaping member, a rubber shaping member, or a polyurethane shaping member. The shaping member 20 in this embodiment may be a shaping member 20 such as a silicone shaping member, a rubber shaping member, or a polyurethane shaping member with a similar elastic performance range. In other words, the material of the shaping member 20 may be silicone, rubber, or polyurethane. It should be noted that the focus of protection in this embodiment is still the shaping member 20, except that the shaping member 20 is made of an elastic material such as silicone.
[0082] By using elastic shaping members such as silicone shaping members, rubber shaping members, or polyurethane shaping members, the shaping member 20 has good elasticity, strong ability to deform and recover its shape during the welding process, and moderate elasticity, so that it will not break or pull the tab 5 during the welding process, preventing the tab 5 from breaking during the welding process.
[0083] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0084] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion.
[0085] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it may be a connection, a detachable connection, or integrated. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0086] The above has introduced in detail the content provided by the embodiments of the present application, expounded and explained the principles and embodiments of the present application. These explanations are only used to help understand the method and its core idea of the present application. However, the content of this specification should not be construed as a limitation on the present application. Those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. These modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies.
Claims
1. An ultrasonic welding device, characterized in that: The ultrasonic welding device is applied to the welding of battery cells, each of which comprises a battery cell body and multiple layers of tabs, and the ultrasonic welding device is used to weld multiple layers of tabs, and the ultrasonic welding device comprises: A welding assembly, the welding assembly comprising a welding head and a welding seat, the welding head having a first welding surface facing the welding seat, the welding seat having a second welding surface facing the welding head, and a plurality of the tabs can be arranged between the first welding surface and the second welding surface; A shaping piece is arranged between the welding assembly and the battery cell body, a part of the shaping piece is arranged between the plane where the first welding surface is located and the plane where the second welding surface is located, and the shaping piece is elastic.
2. The ultrasonic welding device according to claim 1, characterized in that: The shaping piece is fixed to a side of the welding assembly close to the battery cell body.
3. The ultrasonic welding device according to claim 2, characterized in that: When the pole lugs among the multiple pole lugs close to the welding seat abut against the second welding surface, and the pole lugs among the multiple pole lugs close to the welding seat are parallel to the second welding surface, the shaping member is fixed to a side of the welding head close to the battery cell body, and part of the shaping member protrudes from the first welding surface.
4. The ultrasonic welding device according to claim 2, characterized in that: When the pole lugs among the multiple pole lugs close to the welding head abut against the first welding surface, and the pole lugs among the multiple pole lugs close to the welding seat are parallel to the second welding surface, the shaping member is fixed to a side of the welding seat close to the battery cell body, and part of the shaping member protrudes from the second welding surface.
5. The ultrasonic welding device according to claim 2, characterized in that: There are two shaping pieces, one of which is fixed to a side of the welding head close to the battery cell body, and a portion of the shaping piece protrudes from the first welding surface; the other shaping piece is fixed to a side of the welding seat close to the battery cell body, and a portion of the other shaping piece protrudes from the second welding surface.
6. The ultrasonic welding device according to any one of claims 1 to 5, characterized in that: The shaping member comprises a shaping portion, wherein the shaping portion has a shaping surface for abutting against the pole lug, and the shaping surface is arc-shaped.
7. The ultrasonic welding device according to claim 6, characterized in that: The shaping surface includes a first surface and two second surfaces bent and connected to opposite sides of the first surface. The first surface is a plane, and the second surface is a curved surface.
8. The ultrasonic welding device according to any one of claims 2 to 5, characterized in that: The pole tab includes a first end close to the battery cell body and a second end away from the battery cell body. The shaping member is closer to the first end than the second end and is disposed with a gap from the first end.
9. The ultrasonic welding device according to any one of claims 1 to 5, characterized in that: When the welding head, the welding seat, and the shaping member cooperate with each other to weld the plurality of tabs, the shaping member is arranged outside the plane where the first welding surface is located and the plane where the second welding surface is located.
10. The ultrasonic welding device according to any one of claims 1 to 5, characterized in that: The shaping piece includes a silicone shaping piece, a rubber shaping piece, or a polyurethane shaping piece.