Collector plate welding tool and welding equipment

Abstract

The utility model discloses a current collecting plate welding tool and welding equipment, the welding tool comprises a sinking groove and a first boss, the sinking groove is arranged on one side face of the tool and matched with a cylindrical battery cell and a current collecting plate in appearance, and a plurality of through holes corresponding to a welding area of the current collecting plate are formed in the bottom plane of the sinking groove; the first bosses are arranged on the two sides of the through holes and arranged in the length direction of the through holes, and the height of the first bosses is larger than the depth of the protruding structures of the flow collecting disc, so that the protruding structures can be embedded into the two adjacent first bosses of the two through holes, and the first bosses are attached to the welding area of the flow collecting disc in a flat pressing mode. The current collector plate welding tool can solve the technical problems that when an existing current collector plate welding tool is used, the tool cannot be in direct contact with a welding area of a current collector plate, so that clamping force cannot be accurately obtained, the welding quality is affected, and the rate performance and the safety performance of a battery cell are affected.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core production, and in particular to a collector plate welding tool and welding equipment. Background Art

[0002] In the production process of cylindrical battery cells, the battery cells will be welded to the positive / negative collector plates respectively after the flattening process. At this time, corresponding tooling is required for positioning and clamping, so that the collector plates and the positions where the core needs to be welded are flat, to prevent unevenness and gaps between the two, so as to avoid poor welding such as welding through or cold welding, which will affect the rate performance and safety performance of the finished battery cells. On the other hand, since the flatness of the collector plates and the end faces of the core lugs is difficult to control, and it is even more difficult to make the two planes tightly flat, strict requirements on flatness are required. Therefore, the current collector plates are designed with convex structures at the welding positions to reduce the difficulty of flatness control. At the same time, the convex structures can also increase the structural strength of the collector plates to prevent them from deformation and distortion.

[0003] However, for the current collector with a convex structure, the welding tooling currently used is to design the clamping surface into a plane, and then make a hole in the area corresponding to the welding area. When this tooling is clamping and positioning, there is no direct contact between the tooling and the welding area of ​​the current collector. Instead, the tooling is clamped with the non-welding area of ​​the current collector. This requires strict debugging of the clamping pressure of the equipment. If the pressure is too high, the current collector may be easily deformed, making it impossible to flatten the contact position between the welding area of ​​the current collector and the core, seriously affecting the welding quality. Especially for thinner current collectors, the clamping pressure needs to be more precise. If the pressure is too low, it is easy for the welding area of ​​the current collector to be unable to effectively fit the contact surface of the core, which will also cause poor welding and affect the rate performance and safety performance of the battery cell. Utility Model Content

[0004] In view of this, the utility model proposes a current collecting plate welding tool and welding equipment. The current collecting plate welding tool is suitable for welding a current collecting plate with a convex structure and a battery cell. It can solve the technical problem that when the existing current collecting plate welding tool is in use, the welding area of ​​the tool and the current collecting plate cannot be in direct contact, and the clamping pressure of the equipment needs to be repeatedly adjusted, resulting in the inability to accurately obtain the clamping force, affecting the welding quality, thereby affecting the rate performance and safety performance of the battery cell.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the utility model provides a collector plate welding tool, comprising:

[0007] A sinking groove, which is arranged on one side of the tooling and matches the appearance of the cylindrical battery core and the current collecting plate, and has a plurality of through holes corresponding to the welding areas of the current collecting plate on the bottom plane of the sinking groove;

[0008] The first boss is disposed on both sides of the through hole and arranged along the length direction of the through hole, and the height of the first boss is greater than the depth of the protruding structure of the collecting plate, so that the protruding structure can be embedded between two adjacent first bosses of two adjacent through holes to achieve flat pressing of the first boss and the welding area of ​​the collecting plate.

[0009] In some embodiments, the first boss includes a first vertical edge and a first horizontal edge, the bottom of the first vertical edge is arranged at the edge of the through hole, the top of the first vertical edge is connected to one end of the first horizontal edge, the other end of the first horizontal edge extends away from the through hole, and the upper surface of the first horizontal edge forms a first clamping surface that is flush with the welding area of ​​the collecting plate.

[0010] In some embodiments, there is a gap of 0.05-0.15 mm between a side surface of the first vertical edge close to the protruding structure of the current collecting plate and an outer side surface of the protruding structure of the current collecting plate.

[0011] In some embodiments, a second boss is further included, and the second boss is disposed on a side of the through hole away from the center of the sink and arranged along the width direction of the through hole.

[0012] In some embodiments, the height of the second boss is consistent with the height of the first boss.

[0013] In some embodiments, the second boss includes a second vertical edge and a second horizontal edge, the bottom of the second vertical edge is arranged at the edge of the through hole, the top of the second vertical edge is connected to one end of the second horizontal edge, the other end of the second horizontal edge extends away from the through hole, and the upper surface of the second horizontal edge forms a second clamping surface that is flush with the welding area of ​​the collecting plate.

[0014] In some embodiments, a positioning column is further included, and the positioning column is arranged at the center of the sink, and the diameter of the positioning column is 0.05-0.15 mm smaller than the center hole of the collecting plate.

[0015] In some embodiments, the diameter of the sink is 0.05 to 0.15 mm larger than the outer diameter of the cylindrical battery core.

[0016] In some embodiments, the notch of the sink has a chamfer.

[0017] On the other hand, the utility model provides a current collecting plate welding device, comprising a welding machine and the current collecting plate welding tool provided by the first aspect of the utility model, wherein the current collecting plate welding tool is fixed on the welding machine.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model provides a current collecting plate welding tool and welding equipment, which are used for positioning and clamping cylindrical battery cells and current collecting plates during welding. Different from the existing tooling, the utility model respectively arranges first bosses on both sides of the through hole corresponding to the welding area of ​​the current collecting plate at the bottom of the sink groove, and the height of the first boss is greater than the depth of the convex structure of the current collecting plate. When the current collecting plate is placed in the tooling, the convex structure of the current collecting plate can be embedded in the two adjacent first bosses of the two adjacent through holes. In this way, the upper surface of the first boss is just flush with the welding area of ​​the current collecting plate. That is to say, when the tooling, the current collecting plate and the cylindrical battery cell are clamped, the force-bearing surface is the welding area of ​​the current collecting plate, which can make the welding area of ​​the current collecting plate and the end face of the cylindrical battery cell pole ear effectively flush and clamped, thereby preventing poor welding caused by deformation of the current collecting plate during clamping, thereby avoiding affecting the rate performance and safety performance of the battery cell; at the same time, the clamping pressure can also be relaxed, the debugging time can be reduced, and the production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the collector plate welding tooling described in this embodiment;

[0021] Figure 2 This is an exploded view of the current collecting plate welding tool, the cylindrical battery cell, and the current collecting plate described in this embodiment;

[0022] Figure 3 This is a state diagram of the current collecting plate welding tooling in this embodiment when in use;

[0023] Figure 4 for Figure 3 Enlarged view of point I in the middle.

[0024] 1. current collecting plate welding tool, 11. sink, 111. through hole, 12. first boss, 13. second boss, 14. positioning column, 15. third boss;

[0025] 2. Collecting plate, 21. Protruding structure, 22. Welding area, 23. Center protruding structure;

[0026] 3. Cylindrical battery cell. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] like Figure 2 As shown, the existing current collecting plate 2 for cylindrical battery cells 3 is generally designed with a convex structure 21. During the welding process of the current collecting plate 2 and the cylindrical battery cell 3, the common tooling cannot make the tooling and the welding area 22 of the current collecting plate 2 flush and clamped due to the existence of the convex structure 21, but is clamped with the non-welding area. This requires repeated adjustments to the clamping pressure. If the pressure is too high, the current collecting plate 2 may be easily deformed, and if the pressure is too low, it may be easy for the contact surface between the welding area of ​​the current collecting plate and the cylindrical battery cell 3 to be unable to be effectively pressed. Therefore, whether the pressure is too high or too low, it will cause poor welding and affect the rate performance and safety performance of the battery cell.

[0029] In view of the above technical problems, the utility model provides a collector plate welding tool and welding equipment. Figure 1 The overall structural schematic diagram of the collector plate welding tooling is given as follows: Figure 1 As shown, the present embodiment provides a current collecting plate welding tool 1, which is used for clamping the cylindrical battery cell 3 and the current collecting plate 2, and includes a sink 11 and a first boss 12. The sink 11 is arranged on one side of the current collecting plate welding tool 1 and matches the shapes of the cylindrical battery cell 3 and the current collecting plate 2, and is used to place the current collecting plate 2 and the cylindrical battery cell 3; a through hole 111 corresponding to the welding area 22 of the current collecting plate 2 is opened on the bottom plane of the sink 11, and the number and shape of the through holes 111 match the welding area 22 of the current collecting plate 2, and the first boss 12 is arranged on both sides of the through hole 111 and arranged along the length direction of the through hole 111, that is, the first boss 12 corresponds to the convex structure 21, and the height of the first boss 12 is greater than the depth of the convex structure 21 of the current collecting plate 2.

[0030] Different from the existing tooling, the present embodiment arranges the first bosses 12 along the length direction on both sides of the through hole 111, that is, arranges the first bosses 12 corresponding to the convex structure 21 of the current collecting plate 2, and the height of the first boss 12 is greater than the depth of the convex structure 21. Then, when in use, the convex structure 21 can be just embedded between two adjacent first bosses 12 of two adjacent through holes 111, and the upper surface of the first boss 12 is pressed flush with the welding area 22 of the current collecting plate 2, so that the welding area 22 of the current collecting plate 2 is effectively flush with and clamped to the end face of the pole ear of the cylindrical battery cell 3, preventing poor welding caused by deformation of the current collecting plate during clamping, thereby avoiding affecting the rate performance and safety performance of the battery cell; at the same time, the clamping pressure can also be relaxed, the debugging time can be reduced, and the production efficiency can be improved.

[0031] In addition, the first boss 12 can limit the two sides of the protruding structure 21 of the collecting plate 2 to prevent the collecting plate 2 from rotating freely in the collecting plate welding tool 1, so as to avoid the non-welding area of ​​the collecting plate 2 from rotating to the position where the through hole 111 is opened in the collecting plate welding tool 1.

[0032] In one of the embodiments, the first boss 12 includes a first vertical edge and a first horizontal edge, the bottom of the first vertical edge is arranged at the edge of the through hole 111, the top of the first vertical edge is connected to one end of the first horizontal edge, and the other end of the first horizontal edge extends away from the through hole 111, and the upper surface of the first horizontal edge forms a first clamping surface that is flush with the welding area 22 of the collecting plate 2. The first clamping surface can facilitate the application of pressure to the collecting plate welding tooling 1 to compress the collecting plate 2 and the cylindrical battery cell 3, thereby ensuring the welding quality.

[0033] In one embodiment, there is a gap of 0.05-0.15 mm between the side of the first vertical edge close to the protruding structure 21 of the current collecting plate 2 and the outer side of the protruding structure 21 of the current collecting plate 2, which further prevents the current collecting plate 2 from rotating randomly on the current collecting plate welding tool 1. In this embodiment, the gap between the side of the first vertical edge close to the protruding structure 21 of the current collecting plate 2 and the outer side of the protruding structure 21 of the current collecting plate 2 is preferably 0.1 mm.

[0034] In one of the embodiments, a second boss 13 is further included. The second boss 13 is disposed on a side of the through hole 111 away from the center of the sink 11 and arranged along the width direction of the through hole 111 .

[0035] In one of the embodiments, the height of the second boss 13 is consistent with the height of the first boss 12. The setting of the second boss 13 increases the contact surface between the current collecting plate welding tool 1 and the welding area 22 of the current collecting plate 2, which is more conducive to ensuring the welding quality; the height consistency between the second boss 13 and the first boss 12 ensures the consistency of the contact surface between the current collecting plate welding tool 1 and the welding area 22.

[0036] In one embodiment, the second boss 13 includes a second vertical edge and a second horizontal edge, the bottom of the second vertical edge is arranged at the edge of the through hole 111, the top of the second vertical edge is connected to one end of the second horizontal edge, the other end of the second horizontal edge extends away from the through hole 111, and the upper surface of the second horizontal edge forms a second clamping surface that is flush with the welding area 22 of the collecting plate 2.

[0037] In one embodiment, a positioning column 14 is further included. The positioning column 14 is arranged at the center of the sink 11. The diameter of the positioning column 14 is 0.05-0.15 mm smaller than the center hole of the current collecting plate 2, and is used to position the current collecting plate 2. In this embodiment, the diameter of the positioning column 14 is 0.1 mm smaller than the center hole of the current collecting plate 2.

[0038] In one embodiment, the diameter of the sink 11 is 0.05-0.15 mm larger than the outer diameter of the cylindrical battery core 3. In this embodiment, the diameter of the sink 11 is 0.1 mm larger than the outer diameter of the cylindrical battery core 3.

[0039] In one embodiment, the notch of the sink 11 is chamfered to provide a guide.

[0040] In one embodiment, one side of the sink 11 is open to facilitate placement and removal of the collecting plate 2.

[0041] In one embodiment, if Figure 2 As shown, the central hole of the current collecting plate 2 is also provided with a convex structure around it, which is called the central convex structure 23 in the utility model. Figure 1 As shown, the collecting plate welding tool 1 described in this embodiment is also provided with a third boss 15 at a position corresponding to the center convex structure 23. The third boss 15 is arranged along the circumferential direction of the positioning column 14 and is spaced a certain distance from the positioning column. The setting of the third boss 15 can embed the center convex structure 23 therein, and the upper surface of the third boss 15 is flush and pressed against the welding area 22, thereby further ensuring the welding quality.

[0042] It should be noted that the height of the third boss 15 is consistent with the height of the first boss 12 and the second boss 13. The third boss 15 is composed of a third vertical edge and a third horizontal edge. The bottom of the third vertical edge is set on the bottom plane of the sink 11, and its size corresponds to the center convex structure 23. The top of the third vertical edge is connected to one end of the third horizontal edge, and the other end of the third horizontal edge extends away from the positioning column 14.

[0043] In a second aspect, the present embodiment provides a current collecting plate welding device, comprising a welding machine and the current collecting plate welding tool 1 described in the first aspect of the present embodiment, wherein the current collecting plate welding tool 1 is fixed on the welding machine.

[0044] In summary, if Figure 3 and Figure 4As shown, when the current collecting plate welding tool 1 provided in the present embodiment is used, the current collecting plate 2 is first placed in the sink 11, the current collecting plate 2 is positioned by the positioning column 14, and the current collecting plate 2 is limited by the first boss 12, the second boss 13 and the third boss 15, so that the first boss 12, the second boss 13 and the third boss 15 are in contact with and flush with the welding area 22 of the current collecting plate 2, and then the cylindrical battery cell 3 is placed in the current collecting plate welding tool 1. At this time, the welding area 22 is in contact with and flush with the end face of the pole ear of the cylindrical battery cell 3, and then the cylinder works to clamp the current collecting plate 2 and the cylindrical battery cell 3. Since the heights of the first boss 12, the second boss 13 and the third boss 15 are all greater than the depths of the convex structure 21 and the center convex structure 23, the boss will first contact and bear force with the welding area of ​​the current collecting plate, thereby avoiding the current tooling from pressing the non-welding area when clamping, deformation caused by excessive pressure and gap caused by insufficient pressure, thereby affecting the welding quality.

[0045] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A collector plate welding tool, used for clamping a cylindrical battery cell and a collector plate, characterized in that: include: A sinking groove, which is arranged on one side of the tooling and matches the appearance of the cylindrical battery core and the current collecting plate, and has a plurality of through holes corresponding to the welding areas of the current collecting plate on the bottom plane of the sinking groove; The first boss is disposed on both sides of the through hole and arranged along the length direction of the through hole, and the height of the first boss is greater than the depth of the protruding structure of the collecting plate, so that the protruding structure can be embedded between two adjacent first bosses of two adjacent through holes to achieve flat pressing of the first boss and the welding area of ​​the collecting plate.

2. The collector plate welding tool according to claim 1, characterized in that: The first boss includes a first vertical edge and a first horizontal edge, the bottom of the first vertical edge is arranged at the edge of the through hole, the top of the first vertical edge is connected to one end of the first horizontal edge, the other end of the first horizontal edge extends away from the through hole, and the upper surface of the first horizontal edge forms a first clamping surface that is flush with the welding area of ​​the collecting plate.

3. The collector plate welding tool according to claim 2, characterized in that: There is a gap of 0.05-0.15 mm between a side surface of the first vertical edge close to the convex structure of the current collecting plate and an outer side surface of the convex structure of the current collecting plate.

4. The collector plate welding tool according to claim 2, characterized in that: It also includes a second boss, which is arranged on a side of the through hole away from the center of the sink and arranged along the width direction of the through hole.

5. The collector plate welding tool according to claim 4, characterized in that: The height of the second boss is consistent with the height of the first boss.

6. The collector plate welding tool according to claim 5, characterized in that: The second boss includes a second vertical edge and a second horizontal edge, the bottom of the second vertical edge is arranged at the edge of the through hole, the top of the second vertical edge is connected to one end of the second horizontal edge, the other end of the second horizontal edge extends away from the through hole, and the upper surface of the second horizontal edge forms a second clamping surface that is flush with the welding area of ​​the collecting plate.

7. The collector plate welding tool according to claim 1, characterized in that: It also includes a positioning column, which is arranged at the center of the sink, and the diameter of the positioning column is 0.05-0.15mm smaller than the central hole of the collecting plate.

8. The collector plate welding tool according to claim 1, characterized in that: The diameter of the sink is 0.05 to 0.15 mm larger than the outer diameter of the cylindrical battery core.

9. The collector plate welding tool according to claim 1, characterized in that: The notch of the sink has a chamfer.

10. A collector plate welding device, comprising a welding machine, characterized in that: It also includes the collecting plate welding tool as described in any one of claims 1 to 9, and the collecting plate welding tool is fixed on the welding machine.

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