Cylindrical battery collector plate welding water cooling tool

Abstract

The utility model discloses a cylindrical battery collector plate welding water-cooling tool, and belongs to the technical field of cylindrical battery collector plate welding. Comprising an upper positioning tool and a lower positioning tool which are movably connected, a negative current collecting disc and a negative stud are sequentially arranged between the upper positioning tool and the lower positioning tool, an upper water cooling circulation part is arranged in the upper positioning tool, a plurality of evenly-distributed positioning grooves are formed in the upper end of the lower positioning tool, and a containing groove is formed in the middle of the lower positioning tool. A lower water cooling cycle is arranged in the lower positioning tool; the structure of the tool is optimized, and an upper water cooling circulation and a lower water cooling circulation are arranged in the upper positioning tool and the lower positioning tool respectively, so that a rapid cooling effect is achieved on the negative current collecting disc during laser welding, and then the subsequent welding condition of the negative current collecting disc and a negative lug on the negative side of a battery cell is influenced; therefore, the yield during welding of the negative collector plate and the negative tab of the battery cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a cylindrical battery current collecting disc welding water cooling tool belongs to cylindrical battery current collecting disc welding technical field. BACKGROUND

[0002] With the continuous development of lithium battery industry and the large demand of energy storage field, and the requirement of low cost after product scale, with the technical advantages of energy density, charge and discharge rate, internal resistance of large cylindrical battery itself and the cost potential of batch production, the development of domestic large cylindrical battery is increasing. The copper-nickel plated material is used for process processing of the large cylindrical negative current collecting disc, due to the requirements of weight, negative contact area and flow area, the negative current collecting disc is relatively thin in size, the current collecting disc is connected with the negative stud through laser welding, the energy is large during laser welding, which causes the deformation of the current collecting disc after heating during the welding process, thereby causing the poor contact of the current collecting disc with the negative lug of the battery cell during the subsequent laser welding, and the welding defects such as explosion and virtual welding are prone to occur, thereby affecting the quality of the cylindrical battery as a whole, therefore, it is necessary to design a cylindrical battery current collecting disc welding water cooling tool. SUMMARY

[0003] The utility model provides a cylindrical battery current collecting disc welding water cooling tool in view of the above prior art existing shortage.

[0004] The utility model solves the technical scheme of the above technical problem:

[0005] A cylindrical battery current collecting disc welding water cooling tool, comprising a movable connection of upper positioning tool and lower positioning tool, negative current collecting disc and negative stud are sequentially arranged between the upper positioning tool and the lower positioning tool, the upper water cooling circulation is arranged in the upper positioning tool, a plurality of evenly distributed positioning grooves are arranged on the upper end of the lower positioning tool, a placing groove is arranged in the middle part, and the lower water cooling circulation is arranged in the lower positioning tool.

[0006] Further, the upper water cooling circulation comprises an upper inlet and an upper outlet.

[0007] Further, the upper outlet and the upper inlet are provided with an upper circulation channel.

[0008] Further, the lower water cooling circulation comprises a lower inlet and a lower outlet.

[0009] Further, the lower outlet and the lower inlet are provided with a lower circulation channel.

[0010] Further, the number of positioning grooves is three.

[0011] Further, the upper positioning tool is provided with an avoiding groove on both sides. Further, the upper positioning tool is provided with an avoiding groove on both sides.

[0012] Furthermore, the two clearance grooves each correspond to the lower water inlet and the lower water outlet, respectively.

[0013] Furthermore, the upper positioning fixture has a welding hole in the middle.

[0014] Furthermore, the radius of the welding hole is larger than the circular recess in the center of the negative electrode current collector.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: By optimizing the structure of the tooling and setting upper and lower water cooling circulations inside the upper and lower positioning tooling respectively, the negative electrode current collector can be cooled down quickly during laser welding. This avoids the severe deformation and warping of the 0.2mm thick negative electrode current collector due to high temperature during laser welding, which would affect the subsequent welding of the negative electrode current collector to the negative electrode tab on the negative side of the battery cell. This improves the yield rate of welding the negative electrode current collector to the negative electrode tab of the battery cell. By setting a positioning groove on the lower positioning tooling, the negative electrode current collector and the negative electrode stud can be effectively pressed together after cooperating with the upper positioning tooling, meeting the high requirements for the contact gap of the welded objects in laser welding. The effect is better and the work efficiency is improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 for Figure 1 A sectional view.

[0018] Figure 3 This is a structural schematic diagram of the positioning tooling part of this utility model.

[0019] Figure 4 This is a cross-sectional view of the water-cooling circulation section of this utility model.

[0020] Figure 5 This is a cross-sectional view of the water-cooling circulation section of this utility model.

[0021] Figure 6 for Figure 1 Exploded view.

[0022] In the diagram: 1. Upper positioning fixture; 11. Clearance groove; 12. Welding hole; 2. Lower positioning fixture; 21. Positioning groove; 22. Placement groove; 3. Negative electrode collector plate; 4. Negative electrode stud; 5. Upper water cooling circulation; 51. Upper water inlet; 52. Upper water outlet; 53. Upper circulation channel; 6. Lower water cooling circulation; 61. Lower water inlet; 62. Lower water outlet; 63. Lower circulation channel. Detailed Implementation

[0023] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0024] like Figures 1-6 As shown, a water-cooling fixture for welding a cylindrical battery current collector includes an upper positioning fixture 1 and a lower positioning fixture 2 that are movably connected. A negative current collector 3 and a negative stud 4 are arranged sequentially between the upper positioning fixture 1 and the lower positioning fixture 2. An upper water-cooling circulation 5 is provided inside the upper positioning fixture 1. The lower positioning fixture 2 has several evenly distributed positioning grooves 21 at its upper end and a placement groove 22 in its middle. A lower water-cooling circulation 6 is provided inside the lower positioning fixture 2.

[0025] The upper water cooling cycle 5 includes an upper water inlet 51 and an upper water outlet 52.

[0026] An upper circulation channel 53 is provided between the upper outlet 52 and the upper inlet 51.

[0027] The lower water cooling circulation 6 includes a lower water inlet 61 and a lower water outlet 62.

[0028] A lower circulation channel 63 is provided between the lower outlet 62 and the lower inlet 61.

[0029] The number of positioning grooves 21 is three.

[0030] Both sides of the upper positioning fixture 1 are provided with clearance grooves 11.

[0031] The two clearance grooves 11 correspond to the lower inlet 61 and the lower outlet 62, respectively.

[0032] The upper positioning fixture 1 has a welding hole 12 in the middle.

[0033] The radius of the welding hole 12 is larger than the circular recess in the middle of the negative electrode current collector 3.

[0034] During operation, first connect the upper water cooling circulation 5 in the upper positioning fixture 1 and the lower water cooling circulation 6 in the lower positioning fixture 2 to the chiller. Connect the upper inlet 51 and the lower inlet 61 to the outlet of the chiller, and connect the upper outlet 52 and the lower outlet 62 to the return outlet of the chiller to start the cooling water circulation. Then, place the negative electrode stud 4 into the placement groove 22 of the lower positioning fixture 2. Next, place the negative electrode manifold 3 on top of the negative electrode stud 4, so that the welding surface of the negative electrode manifold 3 contacts the negative electrode stud 4, and the three raised reinforcing ribs of the negative electrode manifold 3 lie in the corresponding three positioning grooves 21 on the lower positioning fixture 2. Finally, place the upper positioning fixture 1 on top of the negative electrode manifold 3. Positioning fixture 1 and lower positioning fixture 2 effectively press the negative current collector 3 and negative stud 4 together. Then, laser welding begins through welding hole 12. Since laser welding requires melting copper at a temperature higher than 1000 degrees Celsius, and copper has good thermal conductivity, the negative current collector 3 is only 0.2mm thick. After being heated, the negative current collector 3 deforms and warps severely. At this time, upper water cooling circulation 5 and lower water cooling circulation 6 effectively reduce the heat conducted to the negative current collector 3 during laser welding, which causes it to deform. This avoids the problem that welding defects such as explosion points and incomplete welds are prone to occur when there is a gap between the negative current collector 3 and the battery cell tab contact surface, which has a significant impact on the yield of the process.

[0035] By optimizing the tooling structure and setting up upper water cooling circulation 5 and lower water cooling circulation 6 inside the upper positioning tooling 1 and lower positioning tooling 2 respectively, the negative electrode current collector 3 can be rapidly cooled during laser welding. This prevents the 0.2mm thick negative electrode current collector 3 from deforming and warping severely due to high temperature during laser welding, which would affect the subsequent welding of the negative electrode current collector 3 to the negative electrode tab on the negative side of the battery cell. This improves the yield rate of welding the negative electrode current collector 3 to the negative electrode tab of the battery cell. By setting a positioning groove 21 on the lower positioning tooling 2, the negative electrode current collector 3 and the negative electrode stud 4 can be effectively pressed together after cooperating with the upper positioning tooling 1, meeting the high requirements for the contact gap of the welded objects in laser welding. The effect is better and the work efficiency is improved.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water-cooling fixture for welding current collectors of cylindrical batteries, characterized in that: The device includes an upper positioning fixture (1) and a lower positioning fixture (2) that are movably connected. A negative electrode collector plate (3) and a negative electrode stud (4) are arranged sequentially between the upper positioning fixture (1) and the lower positioning fixture (2). An upper water cooling circulation (5) is provided inside the upper positioning fixture (1). The lower positioning fixture (2) has several evenly distributed positioning grooves (21) at its upper end and a placement groove (22) in its middle. A lower water cooling circulation (6) is provided inside the lower positioning fixture (2).

2. The water-cooling fixture for welding cylindrical battery current collectors according to claim 1, characterized in that: The upper water cooling cycle (5) includes an upper water inlet (51) and an upper water outlet (52).

3. The water-cooling fixture for welding cylindrical battery current collectors according to claim 2, characterized in that: An upper circulation channel (53) is provided between the upper outlet (52) and the upper inlet (51).

4. The water-cooling fixture for welding cylindrical battery current collectors according to claim 1, characterized in that: The lower water cooling circulation (6) includes a lower water inlet (61) and a lower water outlet (62).

5. The water-cooling fixture for welding cylindrical battery current collectors according to claim 4, characterized in that: A lower circulation channel (63) is provided between the lower outlet (62) and the lower inlet (61).

6. The water-cooling fixture for welding cylindrical battery current collectors according to claim 1, characterized in that: The number of positioning grooves (21) is three.

7. The water-cooling fixture for welding cylindrical battery current collectors according to claim 4, characterized in that: Both sides of the upper positioning fixture (1) are provided with clearance grooves (11).

8. The water-cooling fixture for welding cylindrical battery current collectors according to claim 7, characterized in that: The two clearance grooves (11) correspond to the lower inlet (61) and the lower outlet (62), respectively.

9. The water-cooling fixture for welding cylindrical battery current collectors according to claim 1, characterized in that: The upper positioning fixture (1) has a welding hole (12) in the middle.

10. The water-cooling fixture for welding cylindrical battery current collectors according to claim 9, characterized in that: The radius of the welding hole (12) is larger than the circular recess in the middle of the negative electrode current collector (3).

Images