Battery welding base and ultrasonic welding device
By designing a blocking part and a limiting surface on the battery welding base, the splashing of metal fragments during ultrasonic welding is limited, solving the problem of metal fragments adhering to the colloid and improving battery safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ENPOWER (PEKING) INC
- Filing Date
- 2025-04-23
- Publication Date
- 2026-05-05
AI Technical Summary
During ultrasonic welding, metal debris generated by the friction between the tab and the foil can easily enter the gap between the non-welding area and the welding base, causing the metal debris to adhere to the colloid, which may cause the battery to short circuit or explode, affecting battery safety.
Design a battery welding base. The base body has a blocking part and a limiting surface on the top. The welding area of the electrode tab is attached to the side of the foil facing away from the limiting surface. The adhesive on the electrode tab is placed on the top of the blocking part. The area of the blocking part is larger than the area of the adhesive to limit metal debris in the space between the blocking part and the foil.
This effectively prevents metal debris from adhering to the colloid, improving battery safety and preventing the risk of short circuits or explosions.
Smart Images
Figure CN224196090U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of ultrasonic welding technology, and in particular to a battery welding base and ultrasonic welding device. Background Technology
[0002] A typical pouch battery consists of a cell and tabs. The tabs have soldered and unsoldered areas. Adhesive is applied to both sides of the unsoldered area, sandwiching the cell's foil between a soldering base and the tab. High-frequency vibration of the soldering base causes high-frequency friction between the foil and the tab, completing the soldering connection. After soldering, the cell is encapsulated using an aluminum-plastic film. This film adheres to the adhesive on both sides of the unsoldered area, providing insulation between the tab and the film.
[0003] However, during ultrasonic welding, the tab is a planar structure and is positioned opposite the welding base. The foil is sandwiched between the welding base and the tab, creating a gap between the non-welded area of the tab and the battery cell. During the friction and fusion process between the tab and the foil, a lot of metal debris is generated. This metal debris can easily enter the gap between the non-welded area and the welding base, causing the metal debris to adhere to the colloid. When the aluminum-plastic film is used for subsequent encapsulation, it can cause a short circuit in the battery cell, and in severe cases, it can cause the battery to catch fire and explode, affecting the safety of the battery. Utility Model Content
[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a battery welding base and an ultrasonic welding device.
[0005] The first aspect of this application provides a battery welding base, including a base body, a blocking portion protruding from the top of the base body, and a limiting surface located on at least one side of the blocking portion, the limiting surface being used to place the foil material of the battery cell.
[0006] The blocking portion is configured to support the electrode tab and to make the welding area of the electrode tab fit against the side of the foil facing away from the limiting surface. The adhesive on the electrode tab is placed on the top of the blocking portion, and the area of the top of the blocking portion is larger than the projected area of the adhesive, so that the debris generated by ultrasonic welding is confined in the receiving space between the blocking portion and the foil.
[0007] Optionally, the number of limiting surfaces is two, and the two limiting surfaces are respectively disposed on both sides of the blocking part.
[0008] Optionally, the blocking part is disposed in the middle region of the top of the base body, and the two limiting surfaces are symmetrically arranged about the blocking part.
[0009] Optionally, the two limiting surfaces are distributed along a first direction, and the two ends of the blocking portion extend along a second direction to the two side edges of the base body, wherein the second direction is perpendicular to the first direction.
[0010] Optionally, the limiting surface is provided with a serrated support structure, which is used to support the foil.
[0011] Optionally, the support structure includes a plurality of conical blocks, which are arranged in a matrix on the limiting surface.
[0012] Optionally, the support structure includes a plurality of parallel prisms, which are arranged on the limiting surface in a direction away from the blocking portion.
[0013] Optionally, the side of the blocking part facing away from the base body is a smooth plane and is in contact with the surface of the colloid.
[0014] A second aspect of this application provides an ultrasonic welding apparatus, including an apparatus body, a welding head, and a battery welding base as described in any of the preceding claims;
[0015] The welding head and the base body are mounted on the main body of the device, with the welding head and the limiting surface of the base body facing each other and spaced apart.
[0016] Optionally, the welding head is disposed on the top side of the base body.
[0017] The technical solution provided in this application has the following advantages compared with the prior art:
[0018] This application provides a battery welding base and an ultrasonic welding apparatus. The battery welding base includes a base body with a blocking portion protruding from its top. The top of the base body also has a limiting surface located on at least one side of the blocking portion, used to place the foil of the battery cell. The blocking portion is configured to support the electrode tab, with the welding area of the electrode tab adhering to the side of the foil facing away from the limiting surface. Adhesive on the electrode tab is placed on the top of the blocking portion, and the area of the top of the blocking portion is larger than the area of the adhesive, so that debris generated during ultrasonic welding is confined within the space between the blocking portion and the foil. During the ultrasonic welding process between the foil and the electrode tab, the blocking portion completely blocks the adhesive, confining debris generated by friction between the foil and the electrode tab within the space, preventing debris from adhering to the adhesive, thereby improving battery safety. Attached Figure Description
[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a side view of the battery welding base as described in the embodiments of this application during operation.
[0022] Figure 2 This is a side view of the battery welding base described in an embodiment of this application.
[0023] Figure 3 This is a top view of the battery welding base described in an embodiment of this application.
[0024] Among them, 1. Base body; 11. Limiting surface; 111. Support structure; 2. Blocking part; 3. Foil material; 4. Electrode; 41. Colloid; 5. Accommodation space. Detailed Implementation
[0025] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0026] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.
[0027] Reference Figures 1 to 3 As shown, this application provides a battery welding base, including a base body 1. The top of the base body 1 is provided with a blocking part 2, and the top of the base body 1 is provided with a limiting surface 11 located on at least one side of the blocking part 2. The limiting surface 11 is used to place the foil 3 of the battery cell. The blocking part 2 is configured to support the tab 4 and make the welding area of the tab 4 fit against the side of the foil 3 facing away from the limiting surface 11. The adhesive 41 on the tab 4 is placed on the blocking part 2, and the area of the top of the blocking part 2 is larger than the projected area of the adhesive 41, so that the debris generated by ultrasonic welding is confined in the accommodating space 5 between the blocking part 2 and the foil 3.
[0028] Specifically, the battery cell has a multi-layer structure. One layer of this structure is foil 3, which is a conductive material. After the foil 3 is welded to the tab 4, the battery cell can output electrical energy through the foil 3 and the tab 4. The tab 4 has a sheet structure, and a portion of the tab 4 is a welding area. This welding area needs to be in contact with the foil 3. High-frequency friction is used to drive the tab 4 and the foil 3 to ultrasonically weld them together. The tab 4 has a non-welding area on the side of the welding area, and an adhesive 41 is provided on the non-welding area. The adhesive 41 can be rubber or insulating soft glue. After the welding area is welded to the foil 3, the non-welding area will be exposed on the outside of the battery cell. In soft-pack batteries, the battery cell needs to be encapsulated with an aluminum-plastic film. After the aluminum-plastic film is encapsulated, a portion of the tab 4 extends out of the aluminum-plastic film, and the aluminum-plastic film adheres to the adhesive 41 in the non-welding area. The adhesive 41 separates the tab 4 from the aluminum-plastic film, preventing short circuits caused by electrical connection between the aluminum-plastic film and the tab 4.
[0029] Because the foil 3 is lightweight and thin, the tab 4 easily moves relative to the foil 3. Therefore, the foil 3 needs to be connected to the welding base, and the tab 4 needs to be attached to the foil 3. The relative movement of the tab 4 and the welding base allows the tab 4 and the foil 3 to be ultrasonically welded. However, the welding area on the tab 4 is small. The adhesive 41 on the tab 4 is located at the edge of the welding area, so that the adhesive 41 can prevent the aluminum-plastic film from contacting the tab 4 during aluminum-plastic film encapsulation. The tab 4 has a larger size on the side of the adhesive 41 facing away from the welding area, allowing it to extend beyond the encapsulated aluminum-plastic film. The electrical appliance can be electrically connected to the tab 4 extending beyond the aluminum-plastic film, so that the battery cell can supply power to the electrical appliance.
[0030] When the tab 4 is welded to the foil 3, the foil 3 is sandwiched between the tab 4 and the welding base. The metal debris generated by the friction between the tab 4 and the foil 3 will splash towards the non-welding area of the tab 4. The metal debris will adhere to the colloid 41 when it splashes to the non-welding area of the tab 4. During the subsequent aluminum-plastic film encapsulation, the metal debris on the colloid 41 will puncture the aluminum-plastic film and cause the battery to short circuit.
[0031] The battery welding base provided in this application has a blocking part 2 on the top of the base body 1. When the foil 3 is sandwiched between the welding area of the tab 4 and the limiting surface 11, the blocking part 2 can completely block the colloid 41, so that the splashed debris is confined in the receiving space 5, preventing the debris from adhering to the colloid and improving the safety of the battery.
[0032] The aforementioned base body 1 can be a block structure. The top plane of the base body 1 serves as the working surface, and the blocking part 2 protrudes from the working surface. The portion of the working surface on the side of the blocking part 2 forms the limiting surface 11. The bottom of the base body 1 is usually connected to a welding device, so that the base body 1 is mounted on the welding device.
[0033] An adhesive can be optionally installed on the limiting surface 11. When the foil 3 of the battery cell is attached to the limiting surface 11, the adhesive will bond the foil 3 to the limiting surface 11, so that the foil 3 and the base body 1 maintain a stable relative position and prevent the foil 3 from moving when the tab 4 vibrates at high frequency. When the tab 4 moves relative to the base body 1, the foil 3 and the tab 4 move relative to each other to complete the ultrasonic welding of the tab 4 and the foil 3.
[0034] Alternatively, the surface of the limiting surface 11 can be roughened so that when the foil 3 is attached to the limiting surface 11, the friction between the limiting surface 11 and the foil 3 is greater than the friction between the foil 3 and the welding area of the electrode tab 4. Thus, when the electrode tab 4 moves relative to the base body 1, the foil 3 and the electrode tab 4 move relative to each other to complete the ultrasonic welding of the electrode tab 4 and the foil 3.
[0035] The friction between the aforementioned colloid 41 and the blocking part 2 is small and will not affect the relative movement between the tab 4 and the blocking part 2. Furthermore, the colloid 41 can be elastically deformed. During ultrasonic thin welding, the vibration amplitude of the tab 4 relative to the base body 1 is small. The friction between the blocking part 2 and the colloid 41 can cause the colloid 41 to undergo small-amplitude elastic deformation, so that the blocking part 2 and the colloid 41 adhere to each other without affecting the movement of the tab 4 relative to the base body 1.
[0036] The area of the top of the aforementioned blocking part 2 is larger than the projected area of the colloid 41. The projected area can be the area of the projection of the colloid 41 on the top surface of the blocking part 2, or the area of the projection of the colloid 41 on the tab 4. The colloid 41 is placed on the top of the blocking part 2, and the area of the blocking part 2 is larger than the projected area of the colloid 41. That is, the projected area of the blocking part 2 on the tab 4 is larger than the projected area of the colloid 41 on the tab 4, and the projection of the colloid 41 on the tab 4 is located inside the projection of the blocking part 2 on the tab 4. The blocking part 2 completely covers the colloid 41, and metal debris splashing onto the side of the blocking part 2 will not adhere to the colloid 41. The end of the blocking part 2 away from the base body 1 is the top, and the top of the blocking part 2 is in contact with the colloid 41, so that there is no gap between the colloid 41 and the blocking part 2, preventing metal debris from entering the gap between the blocking part 2 and the colloid 41.
[0037] When the foil 3 is sandwiched between the electrode tab 4 and the limiting surface 11, there is a gap between the foil 3 and the blocking part 2, so that the foil 3, the limiting surface 11, the blocking part 2 and the electrode tab 4 together form a receiving space 5 on the side wall of the blocking part 2 near the foil 3; the metal debris that splashes during the ultrasonic welding of the foil 3 and the electrode tab 4 will be blocked by the blocking part 2, so that the metal debris is confined within the receiving space 5, thereby preventing the metal debris from adhering to the colloid 41.
[0038] In specific use, the battery welding base provided in this application embodiment is used by attaching the foil 3 to the limiting surface 11, and placing the tab 4 on the side of the foil 3 facing away from the base body 1, so as to clamp the foil 3 between the welding area of the limiting surface 11 and the tab 4. The tab 4 is driven to vibrate relative to the base body 1 in a direction parallel to the limiting surface 11, while the foil 3 and the limiting surface 11 remain relatively stationary, so that the tab 4 and the foil 3 are welded together by high-frequency friction. The metal debris that splashes during the ultrasonic welding of the foil 3 and the tab 4 is confined in the receiving space 5.
[0039] The battery welding base provided in this application includes a base body 1. A blocking portion 2 protrudes from the top of the base body 1, and a limiting surface 11 located on at least one side of the blocking portion 2 is provided on the top of the base body 1. The limiting surface 11 is used to place the foil 3 of the battery cell. The blocking portion 2 is configured to support the tab 4, and the welding area of the tab 4 is attached to the side of the foil 3 facing away from the limiting surface 11. Adhesive 41 on the tab 4 is placed on the top of the blocking portion 2, and the area of the top of the blocking portion 2 is larger than the projected area of the adhesive 41, so that the debris generated during ultrasonic welding is confined in the receiving space 5 between the blocking portion 2 and the foil 3. During the ultrasonic welding process between the foil 3 and the tab 4, the blocking portion 2 completely blocks the adhesive 41, confining the debris generated by the friction between the foil 3 and the tab 4 within the receiving space 5, preventing debris from adhering to the adhesive, thereby improving battery safety.
[0040] Reference Figures 1 to 3 As shown, in some embodiments, there are two limiting surfaces 11, and the two limiting surfaces 11 are respectively disposed on both sides of the blocking part 2.
[0041] With this configuration, the two limiting surfaces 11 can be used alternately. When one limiting surface 11 is worn out after a long period of use, the other limiting surface 11 can be used to limit the foil 3, thus extending the service life of the base body 1.
[0042] Specifically, the blocking part 2 can be set in the middle of the working surface so that the areas of the two limiting surfaces 11 are equal. Alternatively, the blocking part 2 can be set on one edge of the working surface so that the area of one limiting surface 11 is larger than the area of the other limiting surface 11.
[0043] The aforementioned base body 1 is a cuboid structure. Two limiting surfaces 11 are located on either side of the blocking portion 2 along the width direction of the base body 1, or on either side of the blocking portion 2 along the length direction of the base body 1. The limiting surfaces 11 are connected to the foil material 3 for limiting. During ultrasonic welding, the limiting surfaces 11 will be worn. When two limiting surfaces 11 are formed on the working surface, if one limiting surface 11 is more worn, the other limiting surface 11 can be used for ultrasonic welding.
[0044] Reference Figures 1 to 3As shown, in some embodiments, the blocking part 2 is disposed in the middle region of the top of the base body 1, and the two limiting surfaces 11 are symmetrically arranged about the blocking part 2.
[0045] With this configuration, the two limiting surfaces 11 have the same shape and size, so that the contact area between the two limiting surfaces 11 and the foil 3 is the same when the two limiting surfaces 11 are ultrasonically welded. This reduces the influence of the limiting surfaces 11 on the ultrasonic welding connection between the foil 3 and the tab 4, and facilitates the operation of swapping the positions of the two limiting surfaces 11, avoiding the need to adjust the relative positions of the welding head and the base body 1 after swapping the two limiting surfaces 11.
[0046] Specifically, the blocking part 2 can be set at the middle of the top of the base body 1 along the width direction of the base body 1, so that the two limiting surfaces 11 are symmetrical about the blocking part 2 in the width direction of the base body 1; or the blocking part 2 can be set at the middle of the base body 1 along the length direction of the base body 1, so that the two limiting surfaces 11 are symmetrical about the blocking part 2 in the length direction of the base body 1.
[0047] The two limiting surfaces 11 are symmetrical about the blocking part 2, so that the shape and area of the two limiting surfaces 11 are the same. When it is necessary to replace the limiting surface 11 used for ultrasonic welding, the position of the worn limiting surface 11 will be taken as the first position. The base body 1 will be rotated 180° in the horizontal direction, so that the unworn limiting surface 11 can be moved to the first position. There is no need to readjust the position of the vibration welding head on the welding device that is opposite to the base body 1.
[0048] Reference Figures 1 to 3 As shown, in some embodiments, two limiting surfaces 11 are distributed along a first direction, and the two ends of the blocking part 2 extend along a second direction to the two side edges of the base body 1, with the second direction being perpendicular to the first direction.
[0049] With this configuration, the blocking part 2 separates the working surface of the base body 1, and the limiting surface 11 also extends along the length direction of the base body 1, increasing the area of the limiting surface 11. Furthermore, any position of the limiting surface 11 can form a receiving space with the blocking part 2, the tab 4, and the foil 3, so that the blocking part 2 can always prevent the splashed debris from moving onto the colloid 41.
[0050] Specifically, the first direction can be the width direction of the base body 1, and the second direction can be the length direction of the base body 1. The blocking part 2 is set in the middle of the working surface along the width direction of the base body 1, so that the two limiting surfaces 11 are symmetrical about the blocking part 2 along the width direction of the base body 1. The blocking part 2 can be a cuboid block or a block of other shapes. The blocking part 2 extends along the length direction of the base body 1, so that the two ends of the blocking part 2 are on the opposite sides of the working surface along the length direction of the base body 1, so that the blocking part 2 divides the working surface into two planes with equal areas. The planes on both sides of the blocking part 2 are the limiting surfaces 11.
[0051] Alternatively, the second direction can be the length direction of the base body 1, the second direction can be the width direction of the base body 1, the blocking part 2 is set at the middle of the top of the base body 1 along the length direction of the base body 1, and the blocking part 2 extends along the width direction of the base body 1.
[0052] Reference Figure 1 and Figure 2 As shown, in some embodiments, the limiting surface 11 is provided with a serrated support structure 111, which is used to support the foil 3.
[0053] With this configuration, the serrated support structure 111 increases the roughness of the limiting surface 11, which can increase the friction between the foil 3 and the limiting surface 11, thereby keeping the foil 3 and the limiting surface 11 relatively stationary during ultrasonic welding.
[0054] Specifically, the support structure 111 can be selected as multiple protrusions formed on the limiting surface 11. The cross-section of the protrusions can be triangular or rectangular. The blocking part 2 and the limiting surface 11 can be arranged along the width direction of the base body 1. During ultrasonic welding, the electrode 4 usually moves back and forth relative to the base body 1 in the width direction of the base body 1. At this time, the multiple protrusions rub against the foil 3, so that the multiple protrusions can increase the friction between the foil 3 and the limiting surface 11 in the first direction. The multiple protrusions are arranged in sequence to form a serrated shape on the limiting surface 11.
[0055] Alternatively, the blocking part 2 and the limiting surface 11 can be arranged along the length of the base body 1. During ultrasonic welding, the electrode 4 usually moves back and forth relative to the base body 1 in the length of the base body 1. At this time, multiple protrusions rub against the foil 3, so that the multiple protrusions can increase the friction between the foil 3 and the limiting surface 11 in the first direction.
[0056] Alternatively, the support structure 111 can be selected as multiple conical protrusions or cuboid protrusions. Multiple protrusions are spaced apart on the limiting surface 11 and arranged in a matrix, which increases the roughness of the limiting surface 11 to increase the friction between the foil 3 and the limiting surface 11.
[0057] Reference Figure 1 and Figure 2 As shown, in some embodiments, the support structure 111 includes a plurality of conical blocks arranged in a matrix on the limiting surface 11.
[0058] With this configuration, the multiple conical blocks increase the roughness of the limiting surface 11, resulting in greater frictional force when the foil 3 moves relative to the limiting surface 11 in all directions.
[0059] Specifically, the cone-shaped blocks can be selected as triangular pyramids, square pyramids, or cones, etc. The bottom of the cone-shaped blocks is set on the limiting surface 11, and the tip of the cone-shaped blocks is set in a direction away from the limiting surface 11. Multiple cone-shaped blocks are arranged on the limiting surface 11 along the length and width directions of the base body 1 to form a matrix. The bottoms of two adjacent cone-shaped blocks can be in contact with each other, or the bottoms of two adjacent cone-shaped blocks can be spaced apart. Multiple cone-shaped blocks increase the roughness of the limiting surface 11, thereby increasing the friction between the foil 3 and the limiting surface 11 when the foil 3 is attached to the limiting surface 11.
[0060] Reference Figure 1 and Figure 2 As shown, in some embodiments, the support structure 111 includes a plurality of parallel prisms arranged on the limiting surface 11 in a direction away from the blocking portion 2.
[0061] With this configuration, the prism structure is simple and easy to process. When the tab 4 rubs against the foil 3, it usually moves closer to or away from the blocking part 2 in a direction parallel to the limiting surface 11, so that the blocking part 2 can drive the splashed metal debris. Multiple prisms are arranged in a direction away from the blocking part 2, so that when the tab 4 rubs against the foil 3, multiple prisms can increase the friction between the foil 3 and the limiting surface 11, ensuring that the foil 3 is stably attached to the limiting surface 11.
[0062] Specifically, the blocking part 2 can be extended along the length direction of the base body 1, the limiting surface 11 is provided on one side of the blocking part 2 in the width direction of the base body 1, the prism extends along the length direction of the base body 1, multiple prisms are arranged along the width direction of the base body 1, and adjacent prisms can be spaced apart. When the prism is a triangular prism, the edges of adjacent prisms can be in contact with each other.
[0063] Alternatively, the blocking part 2 can extend along the width direction of the base body 1, and the limiting surface 11 can be provided on one side of the blocking part 2 in the length direction of the base body 1. The prisms can extend along the width direction of the base body 1, and multiple prisms can be arranged along the length direction of the base body 1. The adjacent two prisms can be spaced apart. When the prism is a triangular prism, the edges of the adjacent two prisms can be in contact with each other.
[0064] Reference Figure 1 and Figure 2 As shown, in some embodiments, the height of the blocking portion 2 is less than or equal to the height of the foil 3 of the battery cell.
[0065] With this configuration, when the welding area of the tab 4 is attached to the foil 3, the adhesive 41 on the tab 4 can be attached to the end face of the blocking part 2 facing away from the limiting surface 11, ensuring that there is no gap between the blocking part 2 and the adhesive 41.
[0066] Specifically, the direction perpendicular to the working surface is the height direction. The adhesive 41 on the tab 4 will protrude from the surface of the tab 4. The size of the blocking part 2 can be selected to be equal to the difference between the height of the foil 3 and the height of the adhesive 41, so that when the adhesive 41 is attached to the top of the blocking part 2, the welding area of the tab 4 can be attached to the foil 3. Alternatively, the height of the foil 3 can be equal. When the foil 3 is attached to the limiting surface 11, the side of the foil 3 facing away from the limiting surface 11 and the side of the blocking part 2 facing away from the limiting surface 11 are on the same plane. The adhesive 41 has elastic deformation capability and is relatively thin. After the blocking part 2 and the adhesive 41 are attached, the adhesive 41 is compressed and elastically deformed, so that the welding area of the tab 4 can be attached to the foil 3.
[0067] Reference Figure 3 As shown, in some embodiments, the side of the blocking part 2 facing away from the base body 1 is a smooth plane and is in contact with the surface of the colloid 41. This arrangement ensures that the side of the blocking part 2 in contact with the colloid 41 is smooth, reducing the friction between the blocking part 2 and the colloid 41. This prevents the friction between the blocking part 2 and the colloid 41 from hindering the movement of the tab 4 relative to the base body 1, ensuring that the foil 3 can complete the orientation welding operation with the tab 4.
[0068] Specifically, the side of the blocking part 2 facing away from the base body 1 is a smooth plane, and the side of the colloid 41 facing the working surface is a plane. The side of the colloid 41 facing the working surface is in contact with the smooth plane on the blocking part 2, so that the friction between the blocking part 2 and the colloid 41 is small, and the friction between the colloid 41 and the blocking part 2 is avoided, thus preventing the tab 4 from moving relative to the base body 1.
[0069] The second aspect of this application also provides an ultrasonic welding apparatus, including an apparatus body, a welding head, and a battery welding base as described in any of the preceding claims; the welding head and the base body 1 are mounted on the apparatus body, and the welding head and the limiting surface 11 of the base body 1 are opposite to and spaced apart.
[0070] Specifically, the main body of the device has a mounting position for the mounting base body 1, which is positioned opposite to the welding head. The main body of the device contains a driving component, which is connected to the welding head, enabling the driving component to drive the welding head to vibrate at high frequency. The bottom of the base body 1 is connected to the main body of the device, so that the top of the base body 1 can be exposed on the main body of the device, allowing the welding head to be positioned opposite to the limiting surface 11.
[0071] The welding head can connect to the tab 4. The base body 1 is positioned opposite to the tab 4, and the foil 3 is sandwiched between the tab 4 and the limiting surface 11. When the welding head vibrates at high frequency, it can drive the tab 4 to vibrate at high frequency relative to the base body 1, causing the tab 4 and the foil 3 to weld together through high-frequency friction. The metal debris generated by the welding of the foil 3 and the tab 4 is blocked by the blocking part 2, preventing the debris from splashing onto the colloid 41 of the tab 4 or into the battery cell. The welding head and the base body 1 can be positioned opposite each other in a vertical direction. The welding head can be positioned on the top side of the base body 1 or on the bottom side of the base body 1.
[0072] Reference Figure 1 As shown, in some embodiments, the welding head is disposed on the top side of the base body 1.
[0073] Specifically, the welding head is on the top side of the base body 1. During ultrasonic welding, the electrode 4 is on the top side of the base body 1, and the foil 3 is on the bottom side of the electrode 4. The electrode 4 vibrates at high frequency and rubs against the foil 3. After the electrode 4 is connected to the welding head, it can directly contact the foil 3. If the foil 3 is driven by the ultrasonic welding device to vibrate at high frequency, the foil 3 is thin and easily breaks. A protective sheet needs to be set on the foil 3 to complete the ultrasonic welding. When the welding head is on the top side of the base body 1, the electrode 4 vibrates at high frequency and rubs against the foil 3 to prevent the foil 3 from breaking. The foil 3 adheres to the limiting surface 11 and obtains the support of the base body 1 without the need for an additional protective sheet.
[0074] 1000 battery cells were welded using the battery welding base provided in this application and a traditional flat welding base, respectively. The number of battery cells with metal shavings at the glue block and the top separator of the battery cell was observed. According to the statistics, when welding with the flat base, 55 battery cells had metal shavings, with a defect rate of 0.55%; when welding with the battery welding base provided in this application, 0 battery cells had metal shavings, with a defect rate of 0%. It can be concluded that the two-point battery welding base provided in this application can effectively prevent metal shavings from splashing onto the glue block and can effectively protect the battery cells.
[0075] In specific use, the battery welding base and ultrasonic welding device provided in this application embodiment are used as follows: the foil 3 is attached to the limiting surface 11, the tab 4 is attached to the side of the foil 3 facing away from the limiting surface 11, and the welding head is connected to the tab 4; after the welding head is started, it vibrates in a direction parallel to the working surface, the tab 4 moves relative to the base body 1 and rubs against the foil 3, the foil 3 and the tab 4 are ultrasonically welded together, and the metal debris generated by the friction between the foil 3 and the tab 4 is confined in the accommodating space 5.
[0076] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0077] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A battery welding base, characterized in that, Includes a base body (1), the top of the base body (1) is provided with a blocking part (2), and the top of the base body (1) is provided with a limiting surface (11) located on at least one side of the blocking part (2), the limiting surface (11) is used to place the foil material (3) of the battery cell. The blocking part (2) is configured to support the electrode tab (4) and to make the welding area of the electrode tab (4) fit against the side of the foil (3) facing away from the limiting surface (11). The colloid (41) on the electrode tab (4) is placed on the top of the blocking part (2), and the area of the top of the blocking part (2) is larger than the projected area of the colloid (41), so that the debris generated by ultrasonic welding is confined in the receiving space (5) between the blocking part (2) and the foil (3).
2. The battery welding base according to claim 1, characterized in that, The number of the limiting surfaces (11) is two, and the two limiting surfaces (11) are respectively disposed on both sides of the blocking part (2).
3. The battery welding base according to claim 2, characterized in that, The blocking part (2) is disposed in the middle area of the top of the base body (1), and the two limiting surfaces (11) are symmetrically arranged about the blocking part (2).
4. The battery welding base according to claim 3, characterized in that, The two limiting surfaces (11) are distributed along a first direction, and the two ends of the blocking part (2) extend along a second direction to the two side edges of the base body (1), the second direction being perpendicular to the first direction.
5. The battery welding base according to any one of claims 1 to 4, characterized in that, The limiting surface (11) is provided with a serrated support structure (111), which is used to support the foil (3).
6. The battery welding base according to claim 5, characterized in that, The support structure (111) includes a plurality of conical blocks, which are arranged in a matrix on the limiting surface (11).
7. The battery welding base according to claim 5, characterized in that, The support structure (111) includes a plurality of parallel prisms, which are arranged on the limiting surface (11) in a direction away from the blocking part (2).
8. The battery welding base according to any one of claims 1 to 4, characterized in that, The side of the blocking part (2) facing away from the base body (1) is a smooth plane and is in contact with the surface of the colloid (41).
9. An ultrasonic welding apparatus, characterized in that, Includes a device body, a welding head, and a battery welding base as described in any one of claims 1 to 8; The welding head and the base body (1) are mounted on the device body, and the welding head and the limiting surface (11) of the base body (1) are opposite to each other and spaced apart.
10. The ultrasonic welding apparatus according to claim 9, characterized in that, The welding head is located on the top side of the base body (1).