Tab welding protection sheet, tab welding mechanism and battery
By designing a pole ear welding protective sheet including horizontal part, vertical part and connection part, the problem of the flat plate-shaped protective sheet easily cutting the pole ear is solved, effective protection against the pole ear is achieved, and battery welding quality is improved.
Patent Information
- Application Number
- CN202421448908.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-24
AI Technical Summary
The existing flat plate-shaped protective sheets are easy to cut off the electrode during the electrode welding process, affecting the quality of the finished battery.
An extreme ear welding protective sheet is designed, including a horizontal part, a vertical part and a connecting part. The horizontal part is welded to the welding part of the extreme ear. The vertical part and the horizontal part are connected at a preset angle. The connection part connects between the horizontal part and the vertical part, avoiding chamfers to smoothly connect the horizontal part and the vertical part, and the limit part clamps the periphery of the welding part.
Through this design, the horizontal edges are avoided to split the electrode ears, effectively protect the electrode ears, and improve the battery welding quality.
Smart Images
Figure CN222740604U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of battery manufacturing, and in particular to a tab welding protection sheet, a tab welding mechanism and a battery. Background Art
[0002] With the diversification of battery cell types in the market, higher requirements are also placed on battery manufacturing technology. In the battery manufacturing process, welding is a key process in lithium battery manufacturing. At present, battery cells usually include two methods in the assembly and production stages: lamination and winding. With the sharp increase in the number of tabs in winding and lamination, the tabs (foil) after welding are prone to cracking.
[0003] In the related art, in order to ensure the tension and residue of the tab after welding, a protective sheet is usually added during the tab welding process to prevent the tab from cracking after welding.
[0004] However, the existing protection sheet is usually constructed in a flat plate shape. The thickness of the flat plate protection sheet itself is small, and its front end is easy to cut off the tab, which affects the quality of the finished battery. Utility Model Content
[0005] Based on this, it is necessary to provide a tab welding protection sheet, a tab welding mechanism and a battery to address the problem that the flat protective sheet is easy to cut the tab, affecting the quality of the finished battery.
[0006] In a first aspect, the present application provides a tab welding protection sheet, which adopts the following technical solution:
[0007] A tab welding protection sheet comprises a horizontal portion, a vertical portion and a connecting portion, wherein the horizontal portion is used to be welded to the welding portion of the tab; the vertical portion is connected to the horizontal portion at a preset angle, and the preset angle is greater than or equal to 90°; the connecting portion is connected between the horizontal portion and the vertical portion; wherein, when the tab welding protection sheet is used for tab welding protection, the horizontal portion is used to fit the welding portion, the vertical portion is used to correspond to the non-welding portion of the tab, and the connecting portion is used to correspond to the connection area between the welding portion and the non-welding portion.
[0008] In one embodiment, the connecting portion includes an avoidance chamfer, and the avoidance chamfer can smoothly connect the horizontal portion and the vertical portion.
[0009] In one of the embodiments, the avoidance chamfer is arranged along the extension direction of the connecting portion.
[0010] In one embodiment, the number of the avoidance chamfers is two, and the two avoidance chamfers are disposed at two opposite ends of the connecting portion.
[0011] In one embodiment, the avoidance chamfer is a chamfered right angle or a rounded angle.
[0012] In one embodiment, the horizontal portion includes two opposite side edges connected to the vertical portion, one or more limiting portions are respectively provided on the two side edges, and the limiting portions extend in a direction perpendicular to the horizontal portion.
[0013] In one of the embodiments, the tab welding protection sheet also includes a plurality of limiting portions connected to the horizontal portion, and the plurality of limiting portions are arranged at intervals along the periphery of the horizontal portion. When the tab welding protection sheet is used for tab welding protection, the plurality of limiting portions can be clamped together at the periphery of the welding portion.
[0014] In a second aspect, the present application provides a tab welding mechanism, which adopts the following technical solution:
[0015] A tab welding mechanism comprises the above-mentioned tab welding protection sheet and adapter sheet, wherein the horizontal portion is attached to one side of the welding portion; the vertical portion is arranged corresponding to the non-welding portion, the connecting portion is attached to the connection area between the welding portion and the non-welding portion; the adapter sheet is attached to the other side of the welding portion; wherein the welding portion is located between the tab welding protection sheet and the adapter sheet.
[0016] In one embodiment, a first connecting portion is disposed on the horizontal portion, and a second connecting portion is disposed on the adapter sheet corresponding to the first connecting portion, and the first connecting portion and the second connecting portion are detachably connected to clamp the welding portion.
[0017] In a third aspect, the present application provides a battery, which adopts the following technical solution:
[0018] A battery comprises a battery cell, a tab and the tab welding mechanism, wherein the tab comprises a non-welding portion connected to the battery cell and a welding portion connected to the non-welding portion; the tab welding structure is used to protect the welding portion.
[0019] The above-mentioned tab welding protection sheet completes the connection between the bottom end of the vertical portion and the front end of the horizontal portion by setting a vertical portion on the first side of the horizontal portion (the side close to the non-welding portion of the tab), thereby avoiding the sharp edge of the first side of the horizontal portion cutting off the tab, protecting the tab of the battery and effectively improving the welding quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of a tab welding protection sheet in one embodiment of the present application.
[0021] Figure 2 It is a schematic diagram of a tab welding protection sheet in another embodiment of the present application.
[0022] Figure 3 It is a schematic diagram of a tab welding protection sheet in another embodiment of the present application.
[0023] Figure 4 It is a schematic diagram of a tab welding protection sheet in another embodiment of the present application.
[0024] Figure 5 FIG. 1 is a schematic diagram of a battery in an embodiment of the present application.
[0025] Figure 6 FIG. 1 is a schematic diagram of a battery in another embodiment of the present application.
[0026] Figure 7 for Figure 6 Enlarged view of part A.
[0027] Figure 8 A schematic diagram of a transfer sheet in an embodiment of the present application is shown.
[0028] Notes on the attached drawings:
[0029] 1. Tab welding protection sheet; 11. Horizontal part; 111. First side; 112. Second side; 12. Vertical part; 13. Connecting part; 131. Avoidance chamfer; 14. Limiting part; 2. Adapter; 21. Accommodating gap; 3. Battery cell; 4. Tab; 41. Welding part; 411. Allowance gap; 42. Non-welding part; F1. First direction; F2. Second direction; F3. Third direction. DETAILED DESCRIPTION
[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and 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 present application.
[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method. Among them, the "first direction" may be the length direction of the horizontal portion; the "second direction" may be the width direction of the horizontal portion; and the "third direction" may be the width direction of the horizontal portion.
[0036] With the diversification of battery cell types in the market, higher requirements are also put forward for battery manufacturing technology. In the battery manufacturing process, welding is a key process in lithium battery manufacturing, especially in the lithium battery manufacturing process, ultrasonic welding is usually used to complete the welding operation of the tabs.
[0037] At present, the assembly and production of battery cells usually include stacking and winding. As the number of tabs in winding and stacking increases, the tabs (foils) after welding are prone to cracking. In related technologies, in order to ensure the tension and residue of the tabs after welding, a protective sheet is usually added during the tab welding process to prevent the tabs from cracking after welding.
[0038] However, the existing protective sheet is usually constructed in a flat plate structure. The flat plate protective sheet itself has a small thickness and sharp edges. During the welding process, the front end of the protective sheet is easy to cut the tab, resulting in the quality of the finished battery being affected. Therefore, it is necessary to design a new tab welding protective sheet, tab welding mechanism and battery to address the problem that the flat plate protective sheet is easy to cut the tab, affecting the quality of the finished battery.
[0039] See also Figure 1 , Figure 1 A schematic diagram of a tab welding protection sheet in an embodiment of the present application is shown. An embodiment of the present application provides a tab welding protection sheet 1, which is in direct contact with the welding head to withstand the ultrasonic vibration of the welding head and transmit the vibration to the tab 4 foil. Due to the setting of the protection sheet, the tab 4 foil can be prevented from being broken by vibration, thus playing a protective role. The tab welding protection sheet 1 includes a horizontal portion 11 and a vertical portion 12. In the embodiment of the present application, the horizontal portion 11 and the vertical portion 12 are both configured as a flat plate structure.
[0040] The horizontal portion 11 is arranged along a horizontal plane and is used for welding with the welding portion 41 of the pole lug 4. Along the first direction F1, the horizontal portion 11 includes a first side 111 and a second side 112 arranged opposite to each other, and the first side 111 and the second side 112 both extend along the second direction F2, and the first side 111 is closer to the non-welding portion 42 of the pole lug 4 than the second side 112. The vertical portion 12 is connected to the first side 111 of the horizontal portion 11 and is connected to the horizontal portion 11 at a preset angle, and the preset angle is set to be greater than or equal to 90°, and the vertical portion 12 is used to protect the non-welding portion 42 of the pole lug 4.
[0041] In one embodiment, the horizontal portion 11 is arranged along the horizontal plane, and the vertical portion 12 is arranged along the vertical plane, and the vertical portion 12 is perpendicular to the horizontal portion 11. In the actual manufacturing process, the horizontal portion 11 and the vertical portion 12 can be formed by bending the same plate, and the connecting portion of the two forms a connecting portion 13 for abutting the tab 4.
[0042] Among them, when the pole tab welding protection sheet 1 is used for welding protection of the pole tab 4, the horizontal part 11 is used to fit the welding part 41, the vertical part 12 is used to correspond to the non-welding part 42 of the pole tab 4, and the connecting part 13 is used to correspond to the connection area between the welding part 41 and the non-welding part 42.
[0043] During the welding process of the pole lug 4, the connecting portion 13 which smoothly connects the horizontal portion 11 and the vertical portion 12 abuts against the pole lug 4. Due to the setting of the connecting portion 13, a smooth connection is achieved between the edge of the first side 111 of the horizontal portion 11 and the edge of the bottom end of the vertical portion 12, thereby avoiding the situation where the edge of the horizontal portion 11 cuts or even cuts off the pole lug 4, thereby achieving effective protection of the pole lug 4.
[0044] Combination Figure 2 As shown, Figure 2 A schematic diagram of a tab welding protection sheet in another embodiment of the present application is shown. In some embodiments, the connecting portion 13 includes an avoidance chamfer 131 for avoiding the tab 4 , and the avoidance chamfer 131 can smoothly connect the horizontal portion 11 and the vertical portion 12 .
[0045] In the embodiment of the present application, along the second direction F2, the avoidance chamfer 131 completely penetrates the connecting portion 13, that is, the free edge at the bottom end of the vertical portion 12 is chamfered, and the bevel is arranged along the extension direction of the connecting portion 13, so that an avoidance space is formed between the connecting portion 13 and the non-welding portion 42 of the pole lug 4, thereby avoiding direct contact between the right-angled edge of the connecting portion 13 and the pole lug 4, thereby protecting the pole lug 4.
[0046] See also Figure 3 As shown, Figure 3 A schematic diagram of a tab welding protection sheet in another embodiment of the present application is shown. In some other embodiments, two avoidance chamfers 131 are provided, and along the second direction F2, the two avoidance chamfers 131 are provided at opposite ends of the connecting portion 13, that is, the two sides of the bottom end of the vertical portion 12 are bent toward one side of the horizontal portion 11, thereby avoiding the formation of a sharp angle structure, so as to avoid damage to the tab 4.
[0047] In some of the above embodiments, the avoidance chamfer 131 is set as a rounded corner. In some other embodiments, the avoidance chamfer 131 is set as a right angle. The specific structure can be selected according to the actual processing situation, and will not be described in detail here.
[0048] In some embodiments, the tab welding protection sheet 1 further includes a limiting portion 14 . The limiting portion 14 specifically includes a pair of limiting members. The limiting members are configured as sheet structures and extend in a direction perpendicular to the horizontal portion 11 .
[0049] Continue reading Figure 1As shown, along the second direction F2, a pair of limit members are arranged on opposite sides of the horizontal portion 11 and connected to the horizontal portion 11, and the facing end surfaces of the pair of limit members are used to abut the edges of the welding portion 41 of the pole lug 4, so that the pole lug welding protection sheet 1 can be snapped on both sides of the welding portion 41 of the pole lug 4 with the help of the limit members for positioning.
[0050] See also Figure 4 As shown, Figure 4 A schematic diagram of a tab welding protection sheet in another embodiment of the present application is shown. In some other embodiments, the tab welding protection sheet 1 includes a plurality of limiting portions 14 connected to the horizontal portion 11, and the plurality of limiting portions 14 are arranged at intervals along the periphery of the horizontal portion 11. When the tab welding protection sheet 1 is used for welding protection of the tab 5, all the limiting portions 14 should be clamped together on the welding portion 41 of the tab 4, so as to achieve accurate docking between the welding portion 41 of the tab 4 and the horizontal portion 11.
[0051] Combination Figures 1 to 8 As shown, in some embodiments, the present application also provides a pole lug welding structure, which applies the pole lug welding protection sheet 1 shown in any of the above embodiments. Specifically, the pole lug welding structure includes a pole lug welding protection sheet 1 and a transfer sheet 2, the horizontal portion 11 is attached to one side of the welding portion 41, the vertical portion 12 is arranged corresponding to the non-welding portion 42, and the connecting portion 13 is attached to the connection area between the welding portion 41 and the non-welding portion 42. Along the third direction F3, the pole lug welding protection sheet 1 and the transfer sheet 2 are respectively arranged on opposite sides of the welding portion 41 of the pole lug 4, and can be clamped together on the welding portion 41 of the pole lug 4 to facilitate the welding operation. In the embodiment of the present application, the transfer sheet 2 is constructed into a flat plate structure with the same structure as the horizontal portion 11.
[0052] Furthermore, in order to improve the stability of the tab 4 during welding and reduce the abnormal movement between the adapter plate 2 and the tab welding protection plate 1, in some embodiments, a first connection portion is further provided on the horizontal portion 11, and a second connection portion corresponding to the first connection portion is provided on the adapter plate 2, and the first connection portion and the second connection portion are detachably connected and are clamped together at the periphery of the welding portion 41.
[0053] Specific reference Figure 7 and Figure 8 As shown, the first connection portion may be a limiting portion 14 disposed on the horizontal portion 11 , and the second connection member may be an accommodating notch 21 disposed on the adapter plate 2 , and the accommodating notch 21 is arranged in a one-to-one correspondence with the above-mentioned limiting portion 14 .
[0054] Along the third direction F3, the limiting portion 14 can be adapted to be inserted into the accommodating notch 21, so that the welding portion 41 of the pole lug 4 is surrounded between the horizontal portion 11, the limiting portion 14 and the adapter plate 2, thereby avoiding abnormal movement of the welding portion 41 of the pole lug 4 during the welding process to ensure the welding quality of the pole lug 4.
[0055] In the embodiment of the present application, the first connection portion may be a limit portion 14 disposed on the horizontal portion 11. In some other embodiments, the first connection portion may also be other structures disposed on the horizontal portion 11, as long as a detachable connection with the adapter sheet 2 can be achieved. As shown in the embodiment of the present application, the position of the first connection portion may be the same as the position of the limit portion 14. In some other embodiments, the position of the first connection portion may also be different from the position of the limit portion 14, and is not limited to the periphery of the horizontal portion 11.
[0056] See also Figures 5 to 8 As shown, in some embodiments, the present application also provides a battery, the battery comprising a battery cell 3, a pole tab 4 connected to the battery cell 3, and the above-mentioned pole tab welding structure, the pole tab 4 specifically comprises a non-welding portion 42 connected to the battery cell 3, and a welding portion 41 connected to the non-welding portion 42, the pole tab welding structure is clamped on the welding portion 41 of the pole tab 4 to reduce the occurrence of cracking at the welding portion 41 of the pole tab 4 during the welding process.
[0057] In some other embodiments, the welding portion 41 includes a clearance notch 411, and the clearance notch 411 is arranged corresponding to the limiting portion 14. Along the third direction F3, the clearance notch 411 penetrates the welding portion 41, so that the limiting portion 14 can pass through and fit into the clearance notch 411 along the third direction F3. In the embodiment of the present application, the limiting effect of the limiting portion 14 is further improved by the abutment between the inner wall of the clearance notch 411 and the side wall of the limiting portion 14, thereby ensuring the welding quality.
[0058] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0059] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A tab welding protection sheet, used to protect the tab during the tab welding process, characterized in that: The tab welding protection sheet comprises: A horizontal portion, used for welding with the welding portion of the pole lug; a vertical portion connected to the horizontal portion at a preset angle, wherein the preset angle is greater than or equal to 90°; and A connecting portion, the connecting portion being connected between the horizontal portion and the vertical portion; Among them, when the tab welding protection sheet is used for tab welding protection, the horizontal part is used to fit the welding part, the vertical part is used to correspond to the non-welding part of the tab, and the connecting part is used to correspond to the connection area between the welding part and the non-welding part.
2. The tab welding protection sheet according to claim 1, characterized in that: The connecting portion includes an avoidance chamfer, and the avoidance chamfer can smoothly connect the horizontal portion and the vertical portion.
3. The tab welding protection sheet according to claim 2, characterized in that: The avoidance chamfer is arranged along the extension direction of the connecting portion.
4. The tab welding protection sheet according to claim 2, characterized in that: The avoidance chamfers are provided in two, and the two avoidance chamfers are respectively arranged at two opposite ends of the connecting portion.
5. The tab welding protection sheet according to claim 2, characterized in that: The avoidance chamfer is a right angle or a rounded angle.
6. The tab welding protection sheet according to claim 1, characterized in that: The horizontal portion includes two opposite side edges connected to the vertical portion, one or more limiting portions are respectively arranged on the two side edges, and the limiting portions extend in a direction perpendicular to the horizontal portion.
7. The tab welding protection sheet according to claim 1, characterized in that: The tab welding protection sheet also includes a plurality of limiting portions connected to the horizontal portion, and the plurality of limiting portions are arranged at intervals along the periphery of the horizontal portion. When the tab welding protection sheet is used for tab welding protection, the plurality of limiting portions can be clamped together at the periphery of the welding portion.
8. A tab welding structure, characterized in that: The tab welding structure comprises: The tab welding protection sheet according to any one of claims 1 to 7, wherein the horizontal portion is attached to one side of the welding portion, the vertical portion is arranged corresponding to the non-welding portion, and the connecting portion is attached to the connection area between the welding portion and the non-welding portion; and A transfer sheet, attached to the other side of the welding portion; Wherein, the welding portion is located between the tab welding protection sheet and the adapter sheet.
9. The electrode tab welding structure according to claim 8, characterized in that: A first connecting portion is arranged on the horizontal portion, and a second connecting portion is arranged on the adapter sheet corresponding to the first connecting portion. The first connecting portion and the second connecting portion are detachably connected to clamp the welding portion.
10. A battery, characterized in that: The battery comprises: Battery cells; A tab, comprising a non-welding portion connected to the battery core, and a welding portion connected to the non-welding portion; and The tab welding structure according to any one of claims 7 to 9 is used to protect the welding portion.