Tab welding tool
By designing a tab welding fixture, a "V"-shaped structure is formed using a bearing device and a pre-tightening component to tightly compress the tabs, thus solving the problem of incomplete welding caused by the dispersion of single tabs and improving welding efficiency and battery safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-03-10
AI Technical Summary
During the electrode welding process, individual electrode pieces are scattered and prone to incomplete welding, which affects battery manufacturing efficiency and safety.
Design a tab welding fixture, including a bearing device, a pre-tightening component and a driving device, forming a "V" shape structure through the first and second pressing parts, tightly squeezing multiple single tabs, and using a welding device to achieve welding.
This improves the tightness and efficiency of tab welding, reduces the risk of tearing when the tabs are bundled inside the casing, avoids battery short circuits, and improves battery assembly efficiency and safety.
Smart Images
Figure CN223981376U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a tab welding fixture. Background Technology
[0002] In related technologies, the electrode tab includes multiple individual electrode tabs. During the battery manufacturing process, it is necessary to weld the multiple individual electrode tabs into a whole. However, since the individual electrode tabs are relatively scattered, the problem of poor welding is prone to occur during the welding process of individual electrode tabs.
[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0004] This utility model provides a welding fixture for electrode tabs, the welding fixture for electrode tabs includes: a supporting device, the supporting device including:
[0005] A carrier assembly for carrying a battery cell, the battery cell including tabs;
[0006] The pre-tightening assembly includes a first pressing part and a second pressing part disposed opposite to each other in the thickness direction of the electrode tab. The first pressing part and the second pressing part are respectively disposed on both sides of the electrode tab. A first inclined surface is formed at the end of the first pressing part facing the second pressing part, and a second inclined surface is formed at the end of the second pressing part facing the first pressing part.
[0007] A driving device is used to drive the first pressing part to move along the thickness direction of the electrode tab, so that at least a portion of the first inclined surface and at least a portion of the second inclined surface can be arranged opposite to each other in the electrode tab extension direction.
[0008] In the electrode welding fixture provided in this disclosure, the battery cell can be supported above the carrier component, and the driving device can drive the first pressing part to press down so that at least part of the first inclined surface and at least part of the second inclined surface can be arranged opposite to each other in the electrode extension direction, so that the electrode can be squeezed by the first pressing part and the second pressing part to form a "V" shaped structure, and the multiple single electrode pieces in the electrode will be squeezed more tightly, which facilitates electrode welding.
[0009] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description
[0010] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures.
[0011] in:
[0012] Figure 1 This is a schematic diagram of an exemplary embodiment of the electrode tab welding fixture disclosed herein;
[0013] Figure 2 for Figure 1 Side view of the electrode welding fixture shown;
[0014] Figure 3 for Figure 1 A schematic diagram of the electrode welding fixture from another perspective;
[0015] Figure 4 for Figure 3 Side view of the electrode welding fixture shown;
[0016] Figure 5 This is a schematic diagram of the electrode tab in the welding state in an exemplary embodiment of the electrode tab welding fixture disclosed herein. Detailed Implementation
[0017] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.
[0018] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.
[0019] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0020] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of an element or feature being connected to one or more "upper," "lower," "inner," or "outer" elements, it can be directly connected to one or more "upper," "lower," "inner," or "outer" elements, or indirectly connected to one or more "upper," "lower," "inner," or "outer" elements through intermediate elements.
[0021] like Figure 1-5 As shown, Figure 1 This is a schematic diagram of an exemplary embodiment of the electrode tab welding fixture disclosed herein. Figure 2 for Figure 1 The side view of the electrode welding fixture shown. Figure 3 for Figure 1 The diagram shows a structural schematic of the electrode welding fixture from another perspective. Figure 4 for Figure 3 The side view of the electrode welding fixture shown. Figure 5 This is a schematic diagram of the electrode tab in the welding state in an exemplary embodiment of the electrode tab welding fixture disclosed herein.
[0022] In this exemplary embodiment, as Figure 1-5 As shown, the electrode welding fixture includes a bearing device, which includes a bearing assembly 1, a pre-tightening assembly 2, and a driving device 3. The bearing assembly 1 is used to support the battery cell 5, which includes an electrode 51. The pre-tightening assembly 2 includes a first pressing part 21 and a second pressing part 22 that are disposed opposite to each other in the electrode thickness direction Z. The first pressing part 21 and the second pressing part 22 are respectively disposed on both sides of the electrode 51. The end of the first pressing part 21 facing the second pressing part 22 has a first inclined surface 211, and the end of the second pressing part 22 facing the first pressing part 21 has a second inclined surface 222. The driving device 3 is used to drive the first pressing part 21 to move along the electrode thickness direction Z, so that the first inclined surface 211 can at least partially be disposed opposite to the second inclined surface 222 in the electrode extension direction Y.
[0023] In the electrode welding fixture provided in this exemplary embodiment, the battery cell 5 can be supported above the carrier component 1. The driving device 3 can drive the first pressing part 21 to press down so that the first inclined surface 211 can be at least partially disposed opposite to the second inclined surface 222 in the extension direction Y of the electrode 51. Thus, the electrode 51 can be squeezed by the first pressing part 21 and the second pressing part 22 to form a "V" shaped structure. The multiple single electrodes in the electrode are squeezed more tightly, which facilitates electrode welding. In the subsequent assembly of the battery cell and the shell, the "V" shaped structure formed by the electrode is conducive to its convergence in the shell, which can reduce the risk of the electrode tearing during convergence, thereby ensuring the current carrying capacity of the electrode. Furthermore, since the electrode is easier to converge in the shell, it can avoid the electrode overlapping with the shell or cover plate, prevent the battery from short-circuiting, and improve the battery assembly efficiency.
[0024] The battery cell includes a cell body, which comprises a separator and two electrodes with opposite polarities: a positive electrode and a negative electrode. The cell operates by the movement of metal ions between the positive and negative electrodes. The cell's cycling process involves metal ions moving from the positive electrode to the negative electrode and vice versa. The cell also includes tabs, which are electrically connected to the electrodes. The positive tab is connected to the positive electrode, and the negative tab is connected to the negative electrode. The cell charges and discharges through these tabs. Each electrode comprises a current collector and an active material layer coated on the surface of the current collector. If the electrode is a positive electrode, the current collector can be made of aluminum, and the active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. If the electrode is a negative electrode, the current collector can be made of copper, and the active material layer can be made of carbon or silicon, etc. The separator acts as an insulating layer to prevent short circuits inside the battery caused by contact between the positive and negative electrodes. It also acts as a semi-permeable layer to prevent larger molecules from passing through while allowing smaller charged ions to pass through.
[0025] It should be understood that, in other exemplary embodiments, the battery cell may also be fixed to or below the horizontal side of the carrier component.
[0026] It should be noted that the battery cell also includes the battery cell body 52. The tabs are formed by multiple single tabs stacked together. The thickness direction Z of the tab is the stacking direction of the multiple single tabs in the tab. The width direction X of the tab is the direction that is perpendicular to both the thickness direction Z of the tab and the direction Y in which the tab extends from the battery cell body 52.
[0027] In this exemplary embodiment, the drive device 3 can be a cylinder, hydraulic cylinder, electric cylinder, or other drive device.
[0028] In this exemplary embodiment, as Figure 1-5As shown, the tab 51 may include a pressing area 511 and a welding area 512, which are distributed along the width direction of the tab. The pre-tightening assembly 2 further includes a third pressing part 23, which is fixed to the first pressing part 21 and includes a third pressing side 233. The tab welding fixture may also include a fourth pressing part 24, which may include a fourth pressing side 244. The third pressing side 233 and the fourth pressing side 244 are arranged opposite to each other in the thickness direction Z of the tab 51, and when the tab 51 is located at the welding station, the third pressing side 233 and the fourth pressing side 244 are located on both sides of the pressing area 511. The third pressing side 233 and the fourth pressing side 244 can flatten the extrusion area 511. At the same time, the multiple single-piece tabs in the welding area 512 will also become more compact under the indirect action of the third pressing side 233 and the fourth pressing side 244, which is conducive to the formation of the "V" shape of the tabs, making it easier for the tabs to be bundled in the shell.
[0029] In this exemplary embodiment, as Figure 1-5 As shown, the dimension of the third pressing part 23 in the tab width direction X is smaller than the dimension of the first pressing part 21 in the tab width direction X; the dimension of the fourth pressing part 24 in the tab width direction X is smaller than the dimension of the first pressing part 21 in the tab width direction X. Space is reserved in the upper and lower areas of the welding area 512 for installing a welding device. The tab welding fixture may further include a welding device 6, which includes a first welding head 61 and a second welding head 62 arranged opposite to each other in the tab thickness direction Z. When the tab 51 is located at the welding station, the first welding head 61 and the second welding head 62 are located on both sides of the welding area 512. The first welding head 61 and the second welding head 62 can weld the welding area 512. The welding device 6 can be an ultra-high-speed wave welding device, a resistance welding device, etc.
[0030] In this exemplary embodiment, as Figure 1-5 As shown, in the Y-direction of the electrode tab 51 extending from the cell body, the first inclined surface 211 is at least partially located between the cell body 52 and at least partially between the second inclined surface 222. This arrangement allows the electrode tab 51 to be compressed into a "V" shape.
[0031] In this exemplary embodiment, as Figure 1-5 As shown, in the Y-direction of the tab 51 extending from the cell body, the third pressing side 233 is at least partially located on the side of the second inclined surface 222 away from at least a portion of the first inclined surface 211. The third pressing side 233 can press against the end of the tab away from the cell body 52, thereby facilitating welding in the welding area.
[0032] In this exemplary embodiment, as Figure 1-5As shown, the first inclined plane 211 may be parallel to the second inclined plane 222. It should be understood that in other exemplary embodiments, the first inclined plane 211 may also form a small angle with the second inclined plane 222, for example, the first inclined plane 211 may form an angle of 1°-10° with the second inclined plane 222.
[0033] In this exemplary embodiment, as Figure 1-5 As shown, the angle between the first inclined surface 211 and the electrode thickness direction Z is 5°-50°. For example, the angle between the first inclined surface 211 and the electrode thickness direction Z can be equal to 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, etc. The angle between the second inclined surface 222 and the electrode thickness direction Z is 5°-30°. For example, the angle between the second inclined surface 222 and the electrode thickness direction Z can be equal to 5°, 10°, 15°, 20°, 25°, 30°, etc. If the angle between the two inclined surfaces and the electrode thickness direction Z is too large, the downward pressing depth of the electrode "V" structure is small, and the pre-tightening effect of the electrode is poor; if the angle between the two inclined surfaces and the electrode thickness direction Z is too small, the downward folding angle of the electrode is too large, and the electrode is easily damaged. This exemplary embodiment sets the angle between the two inclined surfaces and the thickness direction Z of the electrode tab to an appropriate size. This setting can reduce the risk of the electrode tab being damaged, while ensuring the pre-tightening effect of the electrode tab.
[0034] In this exemplary embodiment, as Figure 1-5 As shown, the first pressing part 21 is detachably connected to the drive device 3, and the second pressing part 22 is detachably connected to the support assembly 1. For different types of battery cells, this exemplary embodiment can form different shapes of "V" structures on the electrode tab by replacing the first pressing part 21 and the second pressing part 22.
[0035] In this exemplary embodiment, as Figure 1-5 As shown, the dimension of the first inclined surface 211 in the tab thickness direction Z is smaller than the dimension of the second inclined surface 222 in the tab thickness direction Z.
[0036] In this exemplary embodiment, as Figure 1-5 As shown, when the tab 51 is located at the welding station, the fourth pressing side 244 is located below the extrusion zone 511, the first welding head 61 is located above the welding zone 512, and the second welding head 62 is located below the welding zone 512; wherein, the upper surface of the second welding head 62 may be higher than the fourth pressing side 244. The first welding head 61 and the second welding head 62 can have a better extrusion effect on the welding zone 512, thereby improving the welding effect of the tab.
[0037] In this exemplary embodiment, as Figure 1-5As shown, the fourth pressing part 24 and the welding device 6 are fixed to the welding station, and the supporting device can move relative to the welding station. The supporting device can move along the track, and when the supporting device passes the welding station, the welding device 6 welds the electrode tabs.
[0038] In this exemplary embodiment, as Figure 1-5 As shown, the battery cell includes tabs located on opposite sides of the battery cell body. The supporting device may include two oppositely arranged first pressing parts 21, two oppositely arranged second pressing parts 22, and two oppositely arranged third pressing parts 23. The tab welding fixture also includes two oppositely arranged fourth pressing parts 24 and two oppositely arranged welding devices 6 (only one is shown in the figure). The two welding devices 6 can simultaneously weld the tabs on both sides of the battery cell body. This arrangement can improve the welding efficiency of the tabs.
[0039] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.
[0040] The accompanying drawings in this disclosure only illustrate the structures involved in this disclosure; other structures can be referred to with common design. Unless otherwise specified, the embodiments and features described in these embodiments can be combined to obtain new embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.
[0041] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is defined only by the appended claims.
Claims
1. A tab welding tool, characterized by, The tab welding tool comprises a bearing device, which comprises: a bearing assembly (1) for bearing an electric core (5), the electric core (5) comprising a tab (51); a pre-tightening assembly (2) comprising a first pressing part (21) and a second pressing part (22) oppositely arranged in the thickness direction (Z) of the tab, the first pressing part (21) and the second pressing part (22) being arranged on both sides of the tab (51) respectively, one end of the first pressing part (21) facing the second pressing part (22) being formed with a first inclined surface (211), and one end of the second pressing part (22) facing the first pressing part (21) being formed with a second inclined surface (222); a driving device (3) for driving the first pressing part (21) to move in the thickness direction (Z) of the tab, so that the first inclined surface (211) and the second inclined surface (222) are oppositely arranged at least partially in the extension direction (Y) of the tab (51).
2. The tab welding tool of claim 1, wherein The tab (51) comprises an extrusion zone (511) and a welding zone (512), the extrusion zone (511) and the welding zone (512) being distributed in the width direction (X) of the tab, and the pre-tightening assembly (2) further comprises: a third pressing part (23) fixed to the first pressing part, the third pressing part comprising a third pressing side surface (233); The tab welding tool further comprises: a fourth pressing part (24) comprising a fourth pressing side surface (244), the third pressing side surface (233) and the fourth pressing side surface (244) being oppositely arranged in the thickness direction (Z) of the tab (51), and when the tab (51) is located in a welding station, the third pressing side surface (233) and the fourth pressing side surface (244) are located on both sides of the extrusion zone (511).
3. The tab welding tool of claim 2, wherein The size of the third pressing part (23) in the width direction (X) of the tab is smaller than the size of the first pressing part (21) in the width direction (X) of the tab; The size of the fourth pressing part (24) in the width direction (X) of the tab is smaller than the size of the first pressing part (21) in the width direction (X) of the tab; The tab welding tool further comprises: a welding device (6) comprising a first welding head (61) and a second welding head (62) oppositely arranged in the thickness direction (Z) of the tab, the first welding head (61) and the second welding head (62) being located on both sides of the welding zone (512) respectively when the tab (51) is located in a welding station.
4. The tab welding tool of claim 1, wherein The electric core (5) further comprises an electric core body (52) connected to the tab (51); In the extension direction (Y) of the tab (51) from the electric core body (52), the first inclined surface (211) is located at least partially between the electric core body (52) and at least part of the second inclined surface (222).
5. The tab welding tool of claim 2, wherein The third pressing side (233) is at least partially located on the side of the second inclined surface (222) away from the first inclined surface (211) in the direction (Y) in which the tab (51) extends from the body of the battery cell.
6. The tab welding tool of claim 1, wherein The first inclined surface (211) and the second inclined surface (222) are parallel.
7. The tab welding tool of claim 1, wherein The first inclined surface (211) and the tab thickness direction (Z) form an angle of 5°-50°. And / or, the second inclined surface (222) and the tab thickness direction (Z) form an angle of 5°-30°.
8. The tab welding tool of claim 1, wherein, The first pressing part (21) is detachably connected to the driving device (3), and the second pressing part (22) is detachably connected to the bearing assembly (1).
9. The tab welding tool of claim 3, wherein, When the tab (51) is located in the welding station, the fourth pressing side (244) is located below the extrusion area (511), the first welding head (61) is located above the welding area (512), and the second welding head (62) is located below the welding area (512). The upper surface of the second welding head (62) is higher than the fourth pressing side (244).
10. The tab welding tool of claim 3, wherein The fourth pressing part (24) and the welding device (6) are fixed to the welding station, and the bearing device is movable relative to the welding station.