Battery cell welding device

Abstract

The utility model relates to the technical field of welding, in particular to a battery cell welding device which comprises a battery cell positioning device and an extension piece positioning structure, a fastening structure on the battery cell positioning device is used for being matched with a bottom plate and a cover plate to position and clamp a battery cell, and the side face of the battery cell positioning device is provided with an exposing channel for exposing a tab. And the extension sheet positioning structure is adjustably mounted on the side surface where the exposed channel is located in the thickness direction of the battery cell. The battery cell welding device can be used for welding the soft package battery with the tab and the battery cell body having certain deviation in the middle in the thickness direction, and the applicability of a welding tool is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to an electric core welding device. Background Art

[0002] Soft-pack batteries are batteries with high energy density, suitable for lightweight and long-lasting electronic products. As an important component of soft-pack batteries, the tabs play a key role in soft-pack batteries. They are not only the connection points between the battery cells and the external circuits, but also undertake the functions of current transmission and heat dissipation. The tabs of soft-pack batteries are mostly in the middle of the battery in the thickness direction. Therefore, the welding position in the existing tab ultrasonic welding tooling is usually flush with the middle position of the battery. For example, a new type of polymer battery laser welding fixture disclosed in the Chinese utility model patent with authorization announcement number CN204449663U includes a base and an upper cover plate hingedly connected thereto. The battery is placed in a limiting groove on the base, and the base and the upper cover plate are fastened together by means of magnets. One side of the limiting groove is provided with an adjustment block for fixing the battery in the length direction, and the other side is provided with a positive fixed connection with the base. Negative electrode welding pad, positive and negative electrode welding pads are used during welding to achieve horizontal fitting of the welded nickel sheet and the battery tab. Although this welding fixture can ensure the reliability of welding the nickel sheet (i.e., the extension sheet) and the tab, when encountering a soft-pack battery in which the tab is not in the middle of the thickness direction of the battery body, but has a certain offset from the middle of the thickness direction of the battery body, since the position of the welding pad (i.e., the extension sheet positioning structure) on the base is fixed and cannot be adjusted along the thickness direction of the tab stack, the existing tab ultrasonic welding tooling cannot meet the welding requirements of the extension sheet and the tab. Utility Model Content

[0003] The utility model aims to provide a battery core welding device, which solves the problem that the existing tab ultrasonic welding tooling is not suitable for welding soft-pack batteries with a certain offset between the tab and the battery core body in the middle in the thickness direction due to the non-adjustable position of the extended plate positioning structure.

[0004] To achieve the above-mentioned purpose, the utility model provides a battery cell welding device, including a battery cell positioning device and an extension piece positioning structure, the battery cell positioning device includes a base plate and a cover plate, the battery cell positioning device is equipped with a fastening structure for locking the base plate and the cover plate to position and clamp the battery cell, the battery cell positioning device is provided with an exposure channel on its side for exposing the pole ear, and the extension piece positioning structure is adjustably mounted on the side of the battery cell positioning device where the exposure channel is located in the direction of the battery cell thickness.

[0005] Furthermore, the extension piece positioning structure includes a positioning support plate for supporting the extension piece and a connecting plate vertically connected to the edge of the positioning support plate, and the connecting plate is fixedly connected to the side of the battery cell positioning device.

[0006] Furthermore, the connecting plate is provided with a first long mounting hole at both ends in its length direction, and the first long mounting hole extends in the thickness direction of the battery cell. A threaded hole is provided on the side of the battery cell positioning device for installing the extension piece positioning structure. The mounting bolts pass through the first long mounting hole and cooperate with the threaded hole to install the extension piece positioning structure on the battery cell positioning device, and make the position of the extension piece positioning structure adjustable in the thickness direction.

[0007] Furthermore, the positioning bearing plate is provided with an avoidance gap for avoiding the pole ear to extend into, and the upper plate surface of the positioning bearing plate is provided with a positioning groove for supporting the positioning extension piece at the edge of the avoidance gap to ensure that the extension piece fits and overlaps the upper side of the pole ear.

[0008] Furthermore, a splash shield is provided between the bottom plate and the extended piece positioning structure, and an avoidance hole for the pole ear to extend out is provided on the splash shield.

[0009] Furthermore, a splash shield is provided between the bottom plate and the extended piece positioning structure, and the splash shield is composed of an upper shield and a lower shield, and the upper and lower shields are spliced ​​to form an avoidance hole for the tab to extend out.

[0010] Furthermore, at the joint edges of the upper and lower baffles, one is provided with a recess, and the other is provided with a protrusion matched with the recess, and the upper and lower baffles are engaged with each other to form an avoidance hole for the tab to extend out.

[0011] Furthermore, the extension piece positioning structure is provided with a pressing structure for pressing the extension piece.

[0012] Furthermore, the clamping structure is a C-shaped clamping strip arranged at the end of the positioning bearing plate facing away from the connecting plate, and both ends of the C-shaped clamping strip in the length direction have bending sections, and the bending sections are used to hold the positioning bearing plate.

[0013] Beneficial effect: The battery cell welding device provided by the utility model changes the fixed position relationship between the extension piece positioning structure and the battery cell fixing device in the existing welding tooling, so that the extension piece positioning structure is connected to the battery cell fixing device in an adjustable position relative to the battery cell fixing device in the thickness direction of the battery cell. In this way, it is possible to weld soft-pack batteries whose tabs are located in the middle of the battery in the thickness direction, and also to complete the welding of soft-pack batteries whose tabs and the middle part of the battery cell body in the thickness direction have a certain offset. It can adapt to a variety of working conditions and improve the applicability of the welding tooling while ensuring welding reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the electric core welding device of the utility model;

[0015] Figure 2It is a structural schematic diagram of the electric core welding device of the utility model from another perspective;

[0016] Figure 3 for Figure 1 A schematic diagram of the structure of the battery cell positioning device;

[0017] Figure 4 A structural schematic diagram of the battery cell positioning device from another perspective;

[0018] Figure 5 for Figure 1 A schematic diagram of the structure of the middle extension piece positioning structure;

[0019] Figure 6 for Figure 1 A schematic diagram of the structure of the upper and lower baffles of the middle splash baffle;

[0020] Figure 7 for Figure 6 A schematic diagram of the structure of the middle and upper baffle;

[0021] Figure 8 for Figure 6 Structural schematic diagram of the middle and lower baffle;

[0022] Fig. 9 for Figure 1 Schematic diagram of the structure of the middle C-type compression strip;

[0023] In the figure: 1, bottom plate; 11, exposed channel; 12, threaded hole; 2, cover plate; 3, hinge; 4, buckle; 5, extension piece positioning structure; 51, positioning bearing plate; 510, positioning groove; 511, avoidance gap; 512, C-shaped clamping strip; 513; bending section; 52, connecting plate; 521, first mounting long hole; 61, upper baffle plate; 611, recessed portion; 62, lower baffle plate; 621, protruding portion; 63, second mounting long hole; 64, spacing section. DETAILED DESCRIPTION

[0024] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0025] The battery cell welding device of the utility model is mainly aimed at a welding tool used for soft-pack batteries in which the tabs and the battery cell body have a certain offset in the middle in the thickness direction. The existing tab ultrasonic welding tool is fixed and cannot be adjusted during welding. Therefore, it can only be used for welding soft-pack batteries in which the tabs are in the middle of the battery in the thickness direction, and its applicability is poor.

[0026] Therefore, the utility model provides a battery cell welding device, including a battery cell positioning device and an extension piece positioning structure, wherein the battery cell positioning device is provided with an exposure channel for exposing the tab on its side, and the extension piece positioning structure is adjustably installed on the side where the exposure channel is located in the battery cell thickness direction. By setting the extension piece positioning structure in an adjustable position in the thickness direction, the battery cell welding device of the utility model can be applied to the welding of soft-pack batteries with tabs in the middle of the battery cell body in the thickness direction and soft-pack batteries with a certain offset between the tabs and the battery cell body in the middle of the thickness direction, thereby improving the applicability of the battery cell welding device.

[0027] Based on the above main concepts, embodiments are provided below for illustration.

[0028] like Figure 1-4 As shown, the battery cell welding device in the embodiment includes a battery cell positioning device and an extension plate positioning structure 5, the battery cell positioning device includes a base plate 1 and a cover plate 2. In order to ensure that the battery cell placed in the battery cell positioning device can be clamped by the base plate 1 and the cover plate 2 after the cover plate 2 is installed, and to avoid displacement of the battery cell due to vibration or downward pressure of the welding head during welding, the battery cell positioning device is configured with a fastening structure for locking the base plate 1 and the cover plate 2 to position and clamp the battery cell.

[0029] During the manufacturing process of the battery cell, it is necessary to weld an extension piece on the tab to lengthen it, so as to facilitate the packaging of the top and side surfaces. The cell positioning device is provided with an exposure channel 11 on its side for exposing the tab, and the extension piece positioning structure 5 is adjustable in the thickness direction of the cell and installed on the side where the exposure channel 11 is located. Figure 5 As shown, in one embodiment, the extension piece positioning structure 5 includes a positioning support plate 51 for supporting the extension piece and a connecting plate 52 vertically connected to the edge of the positioning support plate 51, and the connecting plate 52 is fixedly connected to the side of the battery cell positioning device.

[0030] In order to achieve adjustable installation of the extension piece positioning structure 5 in the thickness direction of the battery cell on the side where the exposed channel 11 of the battery cell positioning device is located, a mounting hole can be opened on the connecting plate 52, and a plurality of threaded holes are opened along the thickness direction on the side of the battery cell positioning device for installing the extension piece positioning structure 5. When in use, the extension piece positioning structure 5 is adjusted to the required height, and then the mounting bolts are passed through the mounting holes and connected with the threaded holes at the corresponding height. The adjustable installation of the extension piece positioning structure 5 in the thickness direction of the battery cell can also be achieved by setting a magnetic suction device on the fitting surface of the extension piece positioning structure 5 and the battery cell positioning device, and the extension piece positioning structure 5 is adsorbed on the side of the battery cell positioning device. Taking into account the difficulty and cost of processing, in a more preferred embodiment, the connecting plate 52 is provided with a first long mounting hole 521 at both ends in the length direction thereof, and the first long mounting hole 521 extends in the thickness direction of the battery cell, and a threaded hole 12 is provided on the side of the battery cell positioning device for installing the extension piece positioning structure 5, and the mounting bolt passes through the first long mounting hole 521 and cooperates with the threaded hole 12 to install the extension piece positioning structure 5 on the battery cell positioning device, and makes the position of the extension piece positioning structure 5 adjustable in the thickness direction.

[0031] The pole tab and the extension piece are welded by lap welding. To ensure the reliability of welding, the positioning carrier plate 51 is provided with an avoidance notch 511 for avoiding the pole tab to extend into. The upper plate surface of the positioning carrier plate 51 is provided with a positioning groove 510 for supporting the positioning extension piece at the edge of the avoidance notch 511 to ensure that the extension piece fits and overlaps the upper side of the pole tab to avoid interference between the extension piece and the pole tab during the fitting process. In order to prevent welding slag from falling on the avoidance notch 511 during welding and affecting the welding reliability, in a more preferred embodiment, the avoidance notch 511 extends to the end of the connecting plate 52 along the thickness direction away from the positioning carrier plate 51.

[0032] In order to prevent welding spatter from entering the battery cell during welding and affecting the reliability of the welding process, and to ensure the safety of the battery cell production process, in one embodiment, a splash shield is provided between the base plate 1 and the extension plate positioning structure 5, and the splash shield is provided with avoidance holes for the pole ears to extend out. Specifically, through holes corresponding to the number of pole ears are opened on the surface of the splash shield, and the through holes constitute avoidance holes. The splash shield is provided with a second mounting long hole 63 corresponding to the position of the first mounting long hole 521, and the mounting bolt passes through the first mounting long hole 521 and the second mounting long hole 63 and cooperates with the threaded hole 12, and the extension plate positioning structure 5 presses the splash shield onto the battery cell positioning device. Figure 6As shown, in a more preferred embodiment, the splash shield is composed of an upper shield 61 and a lower shield 62, and the upper and lower shields are spliced ​​to form an avoidance hole for the pole lug to extend out. The lower shield 62 is provided with a second mounting hole 63 corresponding to the position of the first mounting hole 521, and the mounting bolt passes through the first mounting hole 521, the second mounting hole 63 and cooperates with the threaded hole 12, and the extended sheet positioning structure 5 presses the lower shield 62 onto the battery cell positioning device. The setting of the upper and lower shields can effectively reduce the welding spatter from entering the battery cell, improve the safety of the battery cell, and because the pole lug is in a loose state before welding, the two shields work together to gather and shape the pole lug.

[0033] In order to further ensure the reliability of the battery core welding process, it is necessary to ensure that the welding spatters generated by the two tabs on the same side will not affect each other during welding. Figure 6-8 As shown, in a more preferred embodiment, at the joint edge of the upper and lower baffles, one is provided with a recessed portion 611, and the other is provided with a convex portion 621 adapted to the recessed portion 611, and the upper and lower baffles are engaged up and down to form an escape hole for the tab to extend out. Taking the two tabs of the battery on the same side as an example, one of the upper and lower baffles is provided with two recessed portions 611, and the other is provided with two convex portions 621 adapted to the recessed portion 611, and the two are engaged up and down to form two escape holes for the tab to extend out, and there is also a concave-convex engaged spacing section 64 between the two escape holes, and the spacing section isolates the welding spatter generated by the two tabs during welding to a certain extent.

[0034] In order to ensure that the extension piece in the positioning groove 510 always remains fixed in the thickness direction and does not move due to the downward pressure of the welding head, the extension piece positioning structure 5 is provided with a clamping structure for clamping the extension piece. The clamping structure can fix the extension piece in the thickness direction. The clamping structure can be a clamping piece that is screwed to the upper end of the positioning groove 510 in the thickness direction and extends inward in the horizontal direction. However, considering that the setting of the clamping edge will result in the extension piece being inserted into the groove only through the opening of the positioning groove in the horizontal direction, if Fig. 9 As shown in a more preferred embodiment, the clamping structure is a C-shaped clamping strip 512 disposed at the end of the positioning bearing plate 51 facing away from the connecting plate 52, and the two ends of the C-shaped clamping strip 512 in the length direction have bending sections 513, and the bending sections 513 are used to hold the positioning bearing plate 51. The C-shaped clamping strip 512 can, on the one hand, clamp the extension sheet in the thickness direction, and at the same time, facilitate operation and improve production efficiency.

[0035] There are many ways to set the fastening structure for assisting the bottom plate 1 and the cover plate 2 to clamp the battery cell. For example, a locking member can be set on the battery cell positioning device. Specifically, the locking member is an L-shaped fixing member. On the side of the same side of the bottom plate 1 and the cover plate 2, a pair of upper and lower locking members are respectively provided. The vertical sides of the two pairs of L-shaped fixing members are respectively close to the sides of the bottom plate 1 and the cover plate 2. The horizontal sides of the paired L-shaped fixing members are opposite to each other. Through holes are provided on the horizontal sides. Bolts are installed in the paired L-shaped fixing members along the two through holes, and then nuts are used to lock them. The locking member can also be a magnetic device set at a corresponding position on the buckling surface of the bottom plate 1 and the cover plate 2, and the battery cell in the battery cell positioning device is clamped by a magnetic connection. In one embodiment, the fastening structure is a hinge 3 and a buckle 4 set on the opposite sides of the battery cell positioning device. Specifically, a hinge 3 is set on one side of the battery cell positioning device, and a buckle 4 is set on the other side opposite to it. Compared with the threaded connection method, the combination of hinge 3 and buckle 4 is more convenient to use, and can ensure that after the buckle 4 is locked, the battery body in the battery positioning device can be clamped by the cover plate 2 and the bottom plate 1, and will not be displaced due to vibration during ultrasonic welding or downward pressure of the welding head.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A core welding device, characterized in that: The invention comprises a battery cell positioning device and an extension piece positioning structure. The battery cell positioning device comprises a base plate and a cover plate. The battery cell positioning device is provided with a fastening structure for locking the base plate and the cover plate to position and clamp the battery cell. The battery cell positioning device is provided with an exposure channel on its side for exposing the tab. The extension piece positioning structure is adjustably mounted on the side of the battery cell positioning device where the exposure channel is located in the direction of the battery cell thickness.

2. The electric core welding device according to claim 1, characterized in that: The extension piece positioning structure comprises a positioning bearing plate for supporting the extension piece and a connecting plate vertically connected to the edge of the positioning bearing plate, and the connecting plate is fixedly connected to the side of the battery cell positioning device.

3. The electric core welding device according to claim 2, characterized in that: The connecting plate is provided with a first long mounting hole at both ends in its length direction, and the first long mounting hole extends in the thickness direction of the battery cell. A threaded hole is provided on the side of the battery cell positioning device for installing the extension piece positioning structure. The mounting bolts pass through the first long mounting hole and cooperate with the threaded hole to install the extension piece positioning structure on the battery cell positioning device, and make the position of the extension piece positioning structure adjustable in the thickness direction.

4. The electric core welding device according to claim 2, characterized in that: The positioning bearing plate is provided with an avoidance gap for avoiding the pole ear to extend into, and the upper plate surface of the positioning bearing plate is provided with a positioning groove for supporting the positioning extension piece at the edge of the avoidance gap to ensure that the extension piece fits and overlaps the upper side of the pole ear.

5. The electric core welding device according to any one of claims 1 to 4, characterized in that: A splash shield is provided between the bottom plate and the extended piece positioning structure, and an avoidance hole for the pole ear to extend out is provided on the splash shield.

6. The electric core welding device according to any one of claims 1 to 4, characterized in that: A splash shield is provided between the bottom plate and the extended piece positioning structure. The splash shield is composed of an upper shield and a lower shield. The upper and lower shields are spliced ​​to form an avoidance hole for the tab to extend out.

7. The electric core welding device according to claim 6, characterized in that: At the joint edge of the upper and lower baffles, one is provided with a concave portion, and the other is provided with a convex portion adapted to the concave portion. The upper and lower baffles are engaged with each other to form an avoidance hole for the pole ear to extend out.

8. The electric core welding device according to any one of claims 1 to 4, characterized in that: The extension piece positioning structure is provided with a pressing structure for pressing the extension piece.

9. The electric core welding device according to claim 8, characterized in that: The clamping structure is a C-shaped clamping strip arranged at the end position of the positioning bearing plate facing away from the connecting plate. Both ends of the C-shaped clamping strip in the length direction have bending sections, and the bending sections are used to hold the positioning bearing plate tightly.

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