Battery welding head, welding equipment and battery

Abstract

The utility model discloses a battery welding head, battery welding equipment and a battery, and relates to the technical field of soft package battery manufacturing. The battery welding head comprises a first joint and a second joint. A first welding face is arranged at the bottom of the first connector in the first direction, a plurality of ribs are arranged on the first welding face at intervals in the second direction, and the ribs extend in the third direction. The top of the second connector in the first direction is provided with a second welding surface, the second welding surface can be attached to the first welding surface in the first direction and clamp and press a shell of the battery, the second welding surface is provided with a plurality of strip grooves at intervals in the second direction, and the strip grooves are matched with the first welding surface. The strip grooves and the strip ribs can be matched in a concave-convex mode in the first direction, and the multiple strip grooves extend in the third direction. By adopting the technology provided by the utility model, the bonding strength and the sealing degree of the sealing opening of the battery shell can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soft-pack battery manufacturing, in particular to a battery welding head, battery welding equipment and a battery. Background Art

[0002] Ultrasonic welding of soft-pack batteries refers to the use of ultrasonic energy to achieve the welding of metal parts, such as connecting the battery shell to other components (such as the tabs). The shell material of the soft-pack battery is usually an aluminum-plastic film, which has thermoplasticity. When welding the shell of the soft-pack battery, the welding head welds the shell of the soft-pack battery together through heating and the clamping pressure of the upper and lower welding work planes.

[0003] However, at present, the welding surface where the welding head contacts the battery shell is mostly flat, so that the edge of the battery shell after welding is also flat, resulting in poor sealing. Based on this, some welding heads are equipped with array-arranged welding teeth, but the welding teeth are easily worn due to stress concentration, resulting in uneven force application of the welding head in the later stage, which reduces the welding sealing of the battery shell. Utility Model Content

[0004] The utility model provides a battery welding head, a battery welding device and a battery, so as to solve the problem of poor sealing degree of outer shell welding of soft-pack batteries in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is to provide a battery welding head, and the battery welding head includes: a first joint and a second joint.

[0006] A first welding surface is provided at the bottom of the first joint along the first direction. A plurality of ribs are arranged at intervals on the first welding surface along the second direction. The plurality of ribs extend along the third direction.

[0007] The second joint is provided with a second welding surface at the top along the first direction, and the second welding surface can be attached to the first welding surface along the first direction and clamp the outer shell of the battery, wherein the second welding surface is provided with a plurality of grooves at intervals along the second direction, and the grooves and the ribs can be matched with each other in a concave-convex manner along the first direction, and the plurality of grooves extend along the third direction.

[0008] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0009] By arranging a plurality of ribs on the first welding surface of the first joint and a plurality of grooves on the second welding surface of the second joint, when the battery shell is welded through the first joint and the second joint, the concave-convex cooperation of the ribs and the grooves can make the battery shell deform accordingly, so that the battery shell after welding generates a plurality of grooves so that different layers of aluminum-plastic films (i.e., the battery shell) can fit tightly, thereby improving the bonding strength and sealing degree of the battery shell seal.

[0010] In some embodiments, the projection of the rib along the third direction is a teardrop shape, and the projection of the groove along the third direction is an arc shape. Further, the rib and the groove are symmetrically arranged along the second direction, and the curvatures of the two sides of the rib connected to the first welding surface are equal.

[0011] By adopting the above technical solution, the rib of the first joint is set to a teardrop shape, and the groove of the second joint is designed to be an arc shape, so as to reduce the stress unevenness or excessive concentration caused by the thickness difference after the multi-layer battery shell is bonded.

[0012] In some embodiments, the first joint is L-shaped, including a first connecting portion and a first welding portion, the first connecting portion is vertically connected to the first welding portion, wherein the first connecting portion is used to connect to the driving device; the first welding portion is provided with the first welding surface at the bottom along the first direction.

[0013] Furthermore, the second joint is L-shaped, including a second connecting portion and a second welding portion, the second connecting portion is vertically connected to the second welding portion, wherein the second connecting portion is used to connect to the driving device, and the second welding portion is provided with a second welding surface at the top along the first direction.

[0014] By adopting the above technical solution, the first connector and the second connector are set to be L-shaped, so that it is convenient to connect external wires or cables to adapt to different application scenarios.

[0015] In some embodiments, the first connector and the second connector are symmetrically arranged along the first direction.

[0016] By adopting the above technical solution, the first joint and the second joint are symmetrically arranged to ensure the quality and strength of welding, while weakening the demand for welding seat.

[0017] In some embodiments, the number of the ribs and the number of the grooves are both two.

[0018] By adopting the above technical solution, the number of ribs and the number of grooves are both two, and they are evenly distributed on the first welding surface and the second welding surface, respectively, so that the connection strength of the battery shell after welding is uniform.

[0019] In some embodiments, the battery welding head is made of copper or copper alloy.

[0020] In some embodiments, the present application also provides a welding device, comprising the above-mentioned battery welding head and a driving device, the driving device comprising a first driving mechanism and a second driving mechanism, the first driving mechanism being used to connect to the first joint of the battery welding head, and the second driving mechanism being used to connect to the second joint of the battery welding head, wherein the first driving mechanism and the second driving mechanism are capable of driving the first joint and the second joint to move toward each other in a first direction and clamp the battery casing.

[0021] The above technical solution can fully ensure the connection strength of the battery shell after welding during use.

[0022] In some embodiments, the present application also provides a battery, including a shell, the shell including a first shell and a second shell, the first shell and the second shell are welded by the above-mentioned welding equipment, and a plurality of grooves corresponding to the number of ribs are formed by welding.

[0023] By adopting the above technical solution, the above battery is welded by the above welding equipment, which ensures the connection stability between the first shell and the second shell of the battery and avoids the shell seal from being easily detached from the welding point between the first shell and the second shell when the battery expands. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, among which:

[0025] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of a battery welding head provided by the utility model;

[0026] Figure 2 It is a partially enlarged schematic diagram of an embodiment of a battery welding head provided by the utility model;

[0027] Figure 3 This is a welding schematic diagram of an embodiment of a battery welding head provided by the utility model;

[0028] Figure 4 yes Figure 3 an enlarged schematic diagram of part A;

[0029] Figure 5It is a three-dimensional structural schematic diagram of an embodiment of a second joint of a battery welding head provided by the utility model.

[0030] In the figure:

[0031] The first welding joint 10; the first welding surface 11; the rib 12; the first connecting portion 13; the first welding portion 14; the second joint 20; the second welding surface 21; the groove 22; the second connecting portion 23; the second welding portion 24.

[0032] Battery—30; first housing—31; second housing—32; tab—33. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] For the convenience of subsequent description, before describing the specific structure of the battery welding head, welding equipment and electromagnetic, this application first combines Figure 1 A first direction (Z), a second direction (X), and a third direction (Y) are defined. The first direction is the height direction of the battery welding head when it is normally placed, such as the Z direction; the second direction is the length direction of the battery welding head when it is normally placed, such as the X direction; and the third direction is the width direction of the battery welding head when it is normally placed, such as the Y direction. In this application, the first direction (Z), the second direction (X), and the third direction (Y) are perpendicular to each other.

[0035] It can be understood that the mutual perpendicularity in the present application is not absolute perpendicularity, and the approximate perpendicularity caused by processing errors and assembly errors (for example, the angle between two structural features is 89.9°) is also within the range of mutual perpendicularity in the present application.

[0036] In some embodiments, in combination Figure 1 to Figure 2 As shown, the battery 30 welding head comprises: a first joint 10 and a second joint 20. The first joint 10 has a first welding surface 11 at the bottom along the first direction, and the first welding surface 11 has a plurality of ribs 12 arranged at intervals along the second direction, and the plurality of ribs 12 extend along the third direction.

[0037] The second joint 20 is provided with a second welding surface 21 at the top along the first direction, and the second welding surface 21 can be attached to the first welding surface 11 along the first direction and clamp the outer shell of the battery 30, wherein the second welding surface 21 is provided with a plurality of grooves 22 at intervals along the second direction, and the grooves 22 and the ribs 12 can be matched in a concave-convex manner along the first direction, and the plurality of grooves 22 extend along the third direction.

[0038] In the embodiment of the present application, a plurality of ribs 12 are provided on the first welding surface 11 of the first joint 10, and a plurality of grooves 22 are provided on the second welding surface 21 of the second joint 20, so that when the battery 30 shell is welded via the first joint 10 and the second joint 20, the concave-convex cooperation of the ribs 12 and the grooves 22 can cause the battery 30 shell to produce corresponding deformation, thereby allowing the battery 30 shell after welding to generate a plurality of grooves so that different layers of aluminum-plastic films (i.e., the battery 30 shell) can fit tightly, thereby improving the bonding strength and sealing degree of the battery 30 shell seal.

[0039] In some embodiments, the present application also provides a welding device, including the above-mentioned battery 30 welding head and a driving device, the driving device including a first driving mechanism and a second driving mechanism, the first driving mechanism is used to connect to the first joint 10 of the battery 30 welding head, and the second driving mechanism is used to connect to the second joint 20 of the battery 30 welding head, wherein the first driving mechanism and the second driving mechanism can drive the first joint 10 and the second joint 20 to move toward each other along a first direction, and clamp the outer shell of the battery 30, so that it can fully ensure the connection strength of the battery 30 outer shell after welding during use.

[0040] In some embodiments, the present application also provides a battery 30, including a shell, the shell including a first shell 31 and a second shell 32, the first shell 31 and the second shell 32 are welded by the above-mentioned welding equipment, and a plurality of grooves corresponding to the number of ribs 12 are formed by welding.

[0041] In the embodiment of the present application, the above-mentioned battery 30 is welded by the above-mentioned welding equipment, which ensures the connection stability between the first shell 31 and the second shell 32 of the battery 30, and also avoids the shell seal from being easily detached from the welding point between the first shell 31 and the second shell 32 when the battery 30 expands.

[0042] The battery 30 is also provided with tabs 33, which include positive tabs 33 and negative tabs 33. The positive tabs 33 and negative tabs 33 are symmetrically arranged at both ends of the battery cell and protrude from the connection between the first shell 31 and the second shell 32. After the first connector 10 and the second connector 20 of the welding device clamp the first shell 31 and the second shell 32, a plurality of grooves can be formed, wherein the positive tabs 33 and the negative tabs 33 are located on adjacent sides of the grooves.

[0043] In some embodiments, in combination Figure 2 As shown, the projection of the rib 12 along the third direction is a teardrop shape, and the projection of the groove 22 along the third direction is an arc shape. Further, the rib 12 and the groove 22 are symmetrically arranged along the second direction, and the curvatures of the two sides of the rib 12 connected to the first welding surface 11 are equal.

[0044] In the embodiment of the present application, since the battery 30 shell itself has a certain thickness, the rib 12 of the first joint 10 is set to a teardrop shape, and the groove 22 of the second joint 20 is designed to be an arc shape, so as to reduce the uneven stress or excessive concentration of stress caused by the thickness difference after the multi-layer shell of the battery 30 is bonded together, resulting in the irregular shape.

[0045] In some embodiments, in combination Figure 3 to Figure 4 As shown, the first joint 10 is L-shaped, including a first connecting portion 13 and a first welding portion 14, wherein the first connecting portion 13 is vertically connected to the first welding portion 14, wherein the first connecting portion 13 is used to connect to the driving device; the first welding portion 14 is provided with a first welding surface 11 at the bottom along the first direction.

[0046] Furthermore, the second joint 20 is L-shaped, including a second connecting portion 23 and a second welding portion 24, the second connecting portion 23 is vertically connected to the second welding portion 24, wherein the second connecting portion 23 is used to connect to the driving device, and the second welding portion 24 is provided with a second welding surface 21 at the top along the first direction.

[0047] For example, in combination Figure 4 As shown, the first connector 10 has a first welding surface 11 facing the second connector 20, and the first welding surface 11 is used to fit with the first shell of the battery 30; the second connector 20 has a second welding surface 21 facing the first connector 10, and the second welding surface 21 is used to fit with the second shell of the battery 30. When the first connector 10 and the second connector 20 are clamped and pressed toward each other, a plurality of grooves 22 can be formed on the outer shell of the battery 30. The first connector 10 and the second connector 20 are set to be L-shaped, so that it is convenient to connect external wires or cables to adapt to different application scenarios.

[0048] In some embodiments, the first joint 10 and the second joint 20 are symmetrically arranged along the first direction to ensure the quality and strength of welding while weakening the requirement of welding seat.

[0049] In some embodiments, the number of the ribs 12 and the number of the grooves 22 are both two.

[0050] For example, in combination Figure 5 As shown, Figure 5A schematic diagram of the three-dimensional structure of an embodiment of the second joint 20 is shown. In some application scenarios, the outer edge of the battery 30 is shorter, so that the welding width between the first shell and the second shell is narrower. The ribs 12 and the grooves 22 are both set to two, and are evenly distributed on the first welding surface 11 and the second welding surface 21, respectively, so that the connection strength of the battery 30 shell after welding is uniform.

[0051] In some embodiments, the material of the welding head of the battery 30 is copper or copper alloy.

[0052] Exemplarily, the first connector 10 and the second connector 20 can be detachably fixed to the welding device, so that the first connector 10 and the second connector 20 can be effectively replaced to adapt to batteries 30 of different sizes.

[0053] The above description is only an implementation method of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present utility model, or directly or indirectly used in other related technical fields, should be included in the protection scope of the present utility model.

Claims

1. A battery welding head, used for welding batteries, characterized in that: include: A first joint, wherein a first welding surface is provided at the bottom of the first joint along the first direction, a plurality of ribs are provided at intervals on the first welding surface along the second direction, and the plurality of ribs extend along the third direction; A second joint, wherein a second welding surface is provided at the top of the second joint along the first direction, and the second welding surface can be attached to the first welding surface along the first direction and clamp the outer shell of the battery, wherein the second welding surface is provided with a plurality of grooves at intervals along the second direction, and the grooves and the ribs can be matched in a concave-convex manner along the first direction, and a plurality of the grooves extend along the third direction.

2. The battery welding head according to claim 1, characterized in that: The projection of the rib along the third direction is in a teardrop shape, and the projection of the groove along the third direction is in an arc shape.

3. The battery welding head according to claim 1, characterized in that: The ribs and the grooves are symmetrically arranged along the second direction, and the curvatures of the two sides of the ribs connected to the first welding surface are equal.

4. The battery welding head according to claim 1, characterized in that: The first joint is L-shaped, including a first connecting portion and a first welding portion, wherein the first connecting portion is vertically connected to the first welding portion, wherein the first connecting portion is used to connect to the driving device; the first welding portion is provided with the first welding surface at the bottom along the first direction.

5. The battery welding head according to claim 1, characterized in that: The second joint is L-shaped, and includes a second connecting portion and a second welding portion, wherein the second connecting portion is vertically connected to the second welding portion, wherein the second connecting portion is used to connect to the driving device, and the second welding portion is provided with a second welding surface at the top along the first direction.

6. The battery welding head according to claim 4 or 5, characterized in that: The first joint and the second joint are symmetrically arranged along the first direction.

7. The battery welding head according to claim 1, characterized in that: The radial length of the rib along the second direction is 0.5 mm to 2 mm.

8. The battery welding head according to claim 1, characterized in that: The battery welding head is made of copper or copper alloy.

9. A welding device, characterized in that: The battery welding head according to any one of claims 1 to 8 further comprises: A driving device, the driving device includes a first driving mechanism and a second driving mechanism, the first driving mechanism is used to connect to the first joint of the battery welding head, and the second driving mechanism is used to connect to the second joint of the battery welding head, wherein the first driving mechanism and the second driving mechanism can drive the first joint and the second joint to move toward each other in a first direction and clamp the battery shell.

10. A battery, characterized in that: include: The shell comprises a first shell and a second shell, the first shell and the second shell are welded by the welding device according to claim 9, and a plurality of grooves corresponding in number to the ribs are formed by welding.

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