Seam welding wheel and composite foil transfer welding equipment

Abstract

The utility model provides a seam welding wheel and composite foil transfer welding equipment, the seam welding wheel is used for performing seam welding on a transfer part of a composite foil, the seam welding wheel is provided with a cylindrical wheel body, the circumferential surface of the wheel body is provided with a first welding tooth area and a second welding tooth area, and the first welding tooth area and the second welding tooth area are arranged on the circumferential surface of the wheel body. The first welding tooth area and the second welding tooth area are sequentially arranged in the axial direction of the wheel body. The first welding tooth area is provided with first welding teeth corresponding to a first to-be-welded area on the switching part, and the second welding tooth area is provided with second welding teeth corresponding to a second to-be-welded area on the switching part; wherein the number of layers of the first to-be-welded area is different from that of layers of the second to-be-welded area. According to the roll welding wheel, the first to-be-welded area and the second to-be-welded area which are different in layer number can be well welded, over welding and insufficient welding caused by layer number difference of a composite foil transfer part can be effectively reduced, and therefore the welding quality of the transfer part can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of composite foil material processing equipment, in particular to a roll welding wheel. The utility model also relates to a composite foil material transfer welding equipment provided with the roll welding wheel. Background Art

[0002] As a new type of foil, the composite foil is composed of a composite current collector with an organic polymer layer, and an ultra-thin metal layer (i.e., a first metal foil 22 and a second metal foil) connected on both sides of the composite current collector. It has the functions of reducing the manufacturing cost of the battery cell, reducing the weight of the battery cell, increasing the energy density, and improving the safety of the battery cell. Among them, in terms of structure, the composite foil is composed of a first metal foil 22 located on the upper side of the composite current collector, a second metal foil located on the lower side of the composite current collector, and a composite current collector to form a three-layer welding area, and the first metal foil 22 and the second metal foil are connected to form two layers of welding areas.

[0003] Since the welding energy required for the three-layer welding area and the two-layer welding area is different, rolling welding is likely to cause a cold weld in the three-layer welding area or an over-weld in the two-layer welding area, which affects the preparation quality of the composite foil. Utility Model Content

[0004] In view of this, the utility model aims to provide a rolling welding wheel, so as to effectively reduce over-welding and false welding caused by the difference in the number of layers at the transition part of the composite foil.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A roll welding wheel is used for roll welding a transition part of a composite foil, the roll welding wheel has a cylindrical wheel body, a first welding tooth area and a second welding tooth area are arranged on the circumferential surface of the wheel body, and the first welding tooth area and the second welding tooth area are arranged in sequence along the axial direction of the wheel body;

[0007] The first welding tooth area is provided with a first welding tooth corresponding to the first area to be welded on the transition part, and the second welding tooth area is provided with a second welding tooth corresponding to the second area to be welded on the transition part;

[0008] The first area to be welded and the second area to be welded have different numbers of layers.

[0009] Further, the first welding teeth are multiple and arranged in an array on the first welding tooth area; and / or the second welding teeth are multiple and arranged in an array on the second welding tooth area.

[0010] Furthermore, on a horizontal plane, a ratio of an expanded area of ​​each of the first welding teeth to an expanded area of ​​each of the second welding teeth is greater than 1:1.2.

[0011] Furthermore, the expansion area of ​​each of the first welding teeth satisfies: 0.04mm 2 ≤S1≤0.25mm 2 ; The expansion area of ​​each of the second welding teeth meets: 0.048mm 2 ≤S1≤0.3mm 2 .

[0012] Further, the cross-sectional shape of the first welding tooth is rectangular or circular; and / or the cross-sectional shape of the second welding tooth is rectangular or circular.

[0013] Furthermore, the total width of the weld marks on the first area to be welded satisfies: 2mm≤W1≤5mm; the total width of the weld marks on the second area to be welded satisfies: 1mm≤W2≤3mm.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The roll welding wheel of the utility model has a first welding tooth area and a second welding tooth area arranged on the wheel body, and the first welding tooth of the first welding tooth area corresponds to the first area to be welded at the transition part, and the second welding tooth of the second welding tooth area corresponds to the second area to be welded at the transition part. In this way, the first area to be welded and the second area to be welded with different numbers of layers can be better welded, and the over-welding and false welding caused by the difference in the number of layers at the transition part of the composite foil can be effectively reduced, thereby ensuring the welding quality of the transition part.

[0016] In addition, the first welding teeth and the second welding teeth are arranged in an array, which is conducive to improving the welding quality of the transition part on the composite foil. Setting the expansion area of ​​the first welding teeth and the expansion area ratio of the second welding teeth can effectively ensure the welding energy required by the first welding area and the second welding area, thereby effectively reducing the occurrence of false welding or over-welding and ensuring the welding quality of the transition part.

[0017] In addition, the definition of the expanded area of ​​the first welding tooth and the expanded area of ​​the second welding tooth can further ensure the welding energy required by the first area to be welded and the second area to be welded. The definition of the cross-sectional shape of the first welding tooth and the second welding tooth can facilitate the processing and preparation of the roll welding wheel. The definition of the total width of the weld mark of the first area to be welded and the total width of the weld mark of the second area to be welded can further ensure the welding quality of the transition part.

[0018] Another purpose of the utility model is to provide a composite foil material transfer welding device, on which the composite foil material transfer welding device is provided with the above-mentioned rolling welding wheel.

[0019] Furthermore, a composite current collector unwinding mechanism, a first metal foil 22 unwinding mechanism, a second metal foil unwinding mechanism and a winding mechanism; the first metal foil 22 unwinding mechanism and the second metal foil unwinding mechanism are respectively arranged on both sides of the composite current collector conveyed by the composite current collector unwinding mechanism; the roll welding wheel is arranged downstream of the composite current collector unwinding mechanism, the first metal foil 22 unwinding mechanism and the second metal foil unwinding mechanism, and the roll welding wheel is used to weld the composite current collector, the first metal foil 22 and the second metal foil into a battery electrode sheet, and a first detection device is provided between the roll welding wheel and the winding mechanism, and the first detection device is used to detect the welding mark quality of the transition part.

[0020] Furthermore, a marking device is provided between the roll welding wheel and the winding mechanism, the marking device is located downstream of the first detection device, and the marking device is used to mark the battery electrode with unqualified welding quality.

[0021] Furthermore, a second detection device is provided upstream of the roll welding wheel, and the second detection device is used to detect the composite current collector, the first metal foil 22 and the second metal foil in a stacked state.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] The composite foil transfer welding equipment described in the utility model can effectively reduce over-welding and false welding caused by the difference in the number of layers at the composite foil transfer part by adopting the rolling welding wheel of the first embodiment, thereby improving the preparation quality of the composite foil.

[0024] In addition, the first detection device provided between the rolling welding wheel and the winding mechanism can facilitate the detection of the weld quality of the transfer part, and timely identify the parts with unqualified weld quality, so as to further improve the welding quality of the transfer part. The marking device provided is conducive to marking the battery pole pieces with unqualified weld quality, and is conducive to the subsequent elimination of unqualified welding products. The second detection device provided is conducive to the detection of the composite current collector, the first metal foil 22 and the second metal foil of the stacking device, so as to ensure the subsequent welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0026] Figure 1 This is a front view of the seam welding roller according to an embodiment of the utility model;

[0027] Figure 2 It is a left side view of the seam welding roller described in the embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the composite foil material described in an embodiment of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the welding stamp described in an embodiment of the utility model;

[0030] Figure 5 This is a structural diagram of the composite foil transfer welding equipment described in an embodiment of the utility model;

[0031] Description of reference numerals:

[0032] 1. wheel body; 2. composite foil; 11. first welding tooth area; 12. second welding tooth area; 111. first welding tooth; 121. second welding tooth; 21. composite current collector; 22. first metal foil; 23. second metal foil; 221. first area to be welded; 222. second area to be welded;

[0033] 10. Composite current collector unwinding mechanism; 20. First metal foil unwinding mechanism; 30. Second metal foil unwinding mechanism; 40. Rolling welding mechanism; 50. Rewinding mechanism; 60. First detection device; 70. Second detection device; 80. Marking device; 90. Roller pair;

[0034] 101, current collector unwinding roller; 102, first tensioning unit; 103, first deviation correcting unit; 201, metal foil unwinding roller; 202, second tensioning unit; 203, second deviation correcting unit; 501, winding roller; 502, third tensioning unit; 503, third deviation correcting unit. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Embodiment 1

[0040] The present embodiment relates to a roll welding wheel for roll welding the transition part of the composite foil 2, which can effectively reduce over-welding and cold welding caused by the difference in the number of layers at the transition part of the composite foil 2, thereby improving the preparation quality of the composite foil 2.

[0041] In terms of overall structure, the roll welding wheel of this embodiment is as follows Figure 1 and Figure 2 As shown, it has a cylindrical wheel body 1, and a first welding tooth area 11 and a second welding tooth area 12 are provided on the circumference of the wheel body 1, and the first welding tooth area 11 and the second welding tooth area 12 are arranged in sequence along the axial direction of the wheel body 1. In addition, the first welding tooth area 11 is provided with a first welding tooth 111 corresponding to the first area to be welded 221 on the transition part, and the second welding tooth area 12 is provided with a second welding tooth 121 corresponding to the second area to be welded 222 on the transition part. Among them, the number of layers of the first area to be welded 221 and the second area to be welded 222 are different.

[0042] At this time, by setting the first welding tooth area 11 and the second welding tooth area 12 on the wheel body 1, and making the first welding tooth 111 of the first welding tooth area 11 correspond to the first area to be welded 221 of the transition part, and the second welding tooth 121 of the second welding tooth area 12 corresponds to the second area to be welded 222 of the transition part, the first areas to be welded 221 and the second areas to be welded 222 of different layers can be better welded, and the over-welding and cold welding caused by the difference in the number of layers of the transition part of the composite foil 2 can be effectively reduced, thereby ensuring the welding quality of the transition part.

[0043] For more details, see Figure 1 and Figure 2As shown, the roll welding wheel of this embodiment has a cylindrical wheel body 1 in structure, and a first welding tooth area 11 and a second welding tooth area 12 are provided on the circumferential surface of the wheel body 1, and the first welding tooth area 11 and the second welding tooth area 12 are arranged in sequence along the axial direction of the wheel body 1. Moreover, as a preferred embodiment, in this embodiment, the first welding tooth area 11 has a plurality of first welding teeth 111 arranged in an array, and the second welding tooth area 12 has a plurality of second welding teeth 121 arranged in an array. The plurality of first welding teeth 111 and second welding teeth 121 arranged in an array is conducive to improving the welding quality of the transition part on the composite foil 2.

[0044] In this embodiment, Figure 3 As shown, the composite foil 2 has a composite current collector 21, and a first metal foil 22 and a second metal foil 23 arranged on the upper and lower sides of the composite current collector 21. Among them, the transition part of the composite foil 2, that is, the position where the first metal foil 22 and the second metal foil 23 are welded to the composite current collector 21. The transition part, that is, the position includes a first area to be welded 221 and a second area to be welded 222. The first area to be welded 221 is a three-layered part where the first metal foil 22, the composite current collector 21 and the second metal foil 23 are stacked, and the second area to be welded 222 is a two-layered part where the first metal foil 22 and the second metal foil 23 are stacked.

[0045] At this time, the first welding tooth 111 on the first welding tooth area 11 corresponds to the first welding area 221, that is, the first welding tooth 111 is used for rolling welding of the three-layer part. The second welding tooth 121 on the second welding tooth area 12 corresponds to the second welding area 222, that is, the second welding tooth 121 is used for rolling welding of the two-layer part. The weld mark formed on the transition part is as follows: Figure 4 As shown, the first welding teeth 111 and the second welding teeth 121 are used to roll weld the first area to be welded 221 and the second area to be welded 222 simultaneously, which can effectively reduce over-welding and cold welding at the transition part, thereby ensuring the welding quality.

[0046] As a preferred embodiment, in this embodiment, on the horizontal plane, the ratio of the expanded area of ​​each first welding tooth 111 to the expanded area of ​​each second welding tooth 121 is greater than 1:1.2. Such an arrangement can effectively ensure the welding energy required by the first area to be welded 221 and the second area to be welded 222, thereby effectively reducing the occurrence of false welding or over-welding, and ensuring the welding quality of the transition part.

[0047] In this embodiment, the expansion area of ​​each first welding tooth 111 satisfies: 0.04mm 2 ≤S1≤0.25mm 2 The development area of ​​each second welding tooth 121 satisfies: 0.048mm 2 ≤S1≤0.3mm 2The limitation of the expansion area of ​​the first welding tooth 111 and the expansion area of ​​the second welding tooth 121 can further ensure the welding energy required by the first area to be welded 221 and the second area to be welded 222 .

[0048] In a specific implementation, the expansion area of ​​each first welding tooth 111 can be set to 0.04 mm 2 、0.08mm 2 , 0.10mm 2 , 0.15mm 2 , 0.18mm 2 , 0.20mm 2 , 0.25mm 2 The development area of ​​each second welding tooth 121 can be set to 0.048 mm, for example. 2 、0.08mm 2 , 0.10mm 2 , 0.15mm 2 , 0.18mm 2 , 0.20mm 2 , 0.25mm 2 wait

[0049] In addition, as a preferred embodiment, in this embodiment, Figure 4 As shown, the total width of the weld marks on the first area to be welded 221 satisfies: 2mm≤W1≤5mm, and the total width of the weld marks on the second area to be welded 222 satisfies: 1mm≤W2≤3mm. By limiting the total width of the weld marks of the first area to be welded 221 and the total width of the weld marks of the second area to be welded 222, the welding quality of the transition part can be further guaranteed. In specific implementation, the total width W1 of the weld marks of the first area to be welded 221 can be set to 2mm, 3mm, 4mm or 5mm, for example. The total width W2 of the weld marks of the second area to be welded 222 can be set to 1mm, 2mm or 3mm, for example.

[0050] In addition, in this embodiment, preferably, the cross-sectional shape of the first welding tooth 111 is rectangular or circular, and the cross-sectional shape of the second welding tooth 121 is rectangular or circular, which is conducive to the processing and preparation of the roll welding wheel.

[0051] It should be noted that, in this embodiment, the plurality of first welding teeth 111 and the plurality of second welding teeth 121 may be arranged in a ring or other arrangement forms in addition to being arranged in an array. In addition, the cross-sectional shapes of the first welding teeth 111 and the second welding teeth 121 may be arranged in other shapes such as a strip or an ellipse in addition to being rectangular or circular.

[0052] The rolling welding wheel of this embodiment can perform better welding on the first welding area 221 and the second welding area 222 with different numbers of layers, and can effectively reduce the over-welding and cold welding caused by the difference in the number of layers at the transition part of the composite foil 2, thereby ensuring the welding quality of the transition part.

[0053] Embodiment 2

[0054] The present embodiment relates to a composite foil 2 transfer welding device, on which the composite foil 2 transfer welding device is provided with the roll welding wheel described in the first embodiment.

[0055] In terms of specific structure, Figure 5 As shown, the composite foil 2 transfer welding equipment of this embodiment includes a composite current collector unwinding mechanism 10, a first metal foil 22 unwinding mechanism 20, a second metal foil unwinding mechanism 30, a rolling welding mechanism 40 and a winding mechanism 50. Among them, the composite current collector unwinding mechanism 10 is used for feeding the composite current collector 21. The first metal foil 22 unwinding mechanism 20 and the second metal foil unwinding mechanism 30 are respectively arranged on both sides of the composite current collector 21 conveyed by the composite current collector unwinding mechanism 10.

[0056] The roll welding wheel is arranged downstream of the composite current collector unwinding mechanism 10, the first metal foil 22 unwinding mechanism 20 and the second metal foil unwinding mechanism 30, and the roll welding wheel is used to weld the composite current collector 21, the first metal foil 22 and the second metal foil 23 into a battery electrode. Specifically, the roll welding mechanism 40 includes a roll welding wheel and a roller arranged oppositely, and the composite current collector 21, the first metal foil 22 and the second metal foil 23 in a stacked state are passed through the roll welding wheel and the roller, and the roll welding wheel is used to weld the transition part to form a battery electrode.

[0057] Furthermore, in this embodiment, a first detection device 60 is provided between the roll welding wheel and the winding mechanism 50. The first detection device 60 is used to detect the weld quality of the transition portion, so that portions with unqualified weld quality can be identified in time, thereby further improving the welding quality of the transition portion.

[0058] In this embodiment, the composite current collector unwinding mechanism 10 includes a current collector unwinding roller 101, a first tensioning unit 102 and a first deviation correction unit 103 arranged in sequence along the current collector conveying direction. Among them, the first tensioning unit 102 is used to tension the conveyed current collector to ensure the reliability of conveying, and the first deviation correction unit 103 is used to correct the conveyed current collector to ensure the accuracy of conveying.

[0059] The first metal foil 22 unwinding mechanism 20 and the second metal foil unwinding mechanism 30 are the same, and both include a metal foil unwinding roller 201, a second tensioning unit 202 and a second deviation correction unit 203 arranged in sequence along the metal foil conveying direction. The second tensioning unit 202 is used to tension the conveyed metal foil to ensure the reliability of the conveying, and the second deviation correction unit 203 is used to correct the conveyed metal foil to ensure the accuracy of its conveying.

[0060] The winding mechanism 50 includes a third deflection correction unit 503, a third tensioning unit 502 and a winding roller 501 which are sequentially arranged along the conveying direction of the composite foil 2, that is, the conveying direction of the battery electrode sheet. The third deflection correction unit 503 is used to correct the conveyed composite foil 2 to ensure the accuracy of conveying, and the third tensioning unit 502 is used to tension the conveyed composite foil 2 to ensure the reliability of conveying.

[0061] In this embodiment, the transported composite current collector 21, the first metal foil 22 and the second metal foil 23 pass through the pair of rollers 90, which are located upstream of the roll welding mechanism 40. As a preferred embodiment, a second detection device 70 is provided upstream of the roll welding wheel, and the second detection device 70 is specifically located between the pair of rollers 90 and the roll welding wheel, and is used to detect the stacked composite current collector 21, the first metal foil 22 and the second metal foil 23. Such a configuration can ensure the subsequent welding quality of the transition part.

[0062] Also as a preferred embodiment, in this embodiment, a marking device 80 is provided between the roll welding wheel and the winding mechanism 50, and the marking device 80 is located downstream of the first detection device 60, and the marking device 80 is used to mark the battery pole pieces with unqualified welding quality. In specific implementation, the marking device 80 is specifically located downstream of the third deviation correction unit 503, which can facilitate marking the battery pole pieces with unqualified welding quality, thereby facilitating the subsequent rejection of unqualified welding products.

[0063] It should be noted that, in this embodiment, the first detection device 60 and the second detection device 70 preferably adopt CCD detection devices in the prior art. Moreover, in this embodiment, there are two first detection devices 60, and the two first detection devices 60 are relatively arranged on both sides of the composite current collector 21, and there are also two second detection devices 70, and the two second detection devices 70 are also relatively arranged on both sides of the composite current collector 21. In addition, a light source is also provided corresponding to each first detection device 60, so that the preset light transmittance can be used to facilitate the determination of whether the welding quality is qualified.

[0064] In addition, it should be noted that the marking device 80 of this embodiment can adopt the structure in the prior art so as to be able to mark unqualified battery electrodes.

[0065] The composite foil 2 transfer welding equipment of this embodiment can effectively reduce over-welding and cold welding caused by the difference in the number of layers at the transfer part of the composite foil 2 by adopting the rolling welding wheel of the first embodiment, thereby improving the preparation quality of the composite foil 2 and having a good use effect.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A roll welding wheel, used for roll welding the transition part of a composite foil, characterized in that: The roll welding wheel has a cylindrical wheel body, a first welding tooth area and a second welding tooth area are arranged on the circumferential surface of the wheel body, and the first welding tooth area and the second welding tooth area are arranged in sequence along the axial direction of the wheel body; The first welding tooth area is provided with a first welding tooth corresponding to the first area to be welded on the transition part, and the second welding tooth area is provided with a second welding tooth corresponding to the second area to be welded on the transition part; The first area to be welded and the second area to be welded have different numbers of layers.

2. The roll welding wheel according to claim 1, characterized in that: The first welding teeth are multiple and arranged in an array on the first welding tooth area; and / or, The second welding teeth are multiple and arranged in an array on the second welding tooth area.

3. The roll welding wheel according to claim 2, characterized in that: On a horizontal plane, a ratio of an expanded area of ​​each of the first welding teeth to an expanded area of ​​each of the second welding teeth is greater than 1:1.

2.

4. The seam welding wheel according to claim 2, characterized in that: The expansion area of ​​each of the first welding teeth meets the following requirements: 0.04mm 2 ≤S1≤0.25mm 2 ; The development area of ​​each of the second welding teeth meets the following requirements: 0.048 mm 2 ≤S1≤0.3mm 2 .

5. The roll welding wheel according to claim 1, characterized in that: The cross-sectional shape of the first welding tooth is rectangular or circular; and / or, The cross-sectional shape of the second welding tooth is rectangular or circular.

6. The seam welding wheel according to any one of claims 1 to 5, characterized in that: The total width of the weld mark on the first area to be welded satisfies: 2mm≤W1≤5mm; The total width of the weld mark on the second area to be welded satisfies: 1mm≤W2≤3mm.

7. A composite foil transfer welding device, characterized in that: The composite foil transfer welding equipment is provided with a roll welding wheel as claimed in any one of claims 1 to 6.

8. The composite foil transfer welding equipment according to claim 7, characterized in that: It includes a composite current collector unwinding mechanism, a first metal foil unwinding mechanism, a second metal foil unwinding mechanism and a winding mechanism; The first metal foil unwinding mechanism and the second metal foil unwinding mechanism are respectively arranged on both sides of the composite current collector transported by the composite current collector unwinding mechanism; The roll welding wheel is arranged downstream of the composite current collector unwinding mechanism, the first metal foil unwinding mechanism and the second metal foil unwinding mechanism, and the roll welding wheel is used to weld the composite current collector, the first metal foil and the second metal foil into a battery electrode sheet. A first detection device is provided between the roll welding wheel and the winding mechanism, and the first detection device is used to detect the welding mark quality of the transfer part.

9. The composite foil transfer welding equipment according to claim 8, characterized in that: A marking device is provided between the roll welding wheel and the winding mechanism. The marking device is located downstream of the first detection device, and the marking device is used to mark the battery pole pieces with unqualified welding quality.

10. The composite foil transfer welding equipment according to claim 8, characterized in that: A second detection device is provided upstream of the roll welding wheel, and the second detection device is used to detect the composite current collector, the first metal foil and the second metal foil in a stacked state.

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