Water-cooling heat conduction mechanism for laser welding of battery top cover pole

Abstract

The utility model discloses a water cooling heat conduction mechanism for laser welding of a battery top cover pole, which comprises heat conduction blocks and a water guide plate which are integrally cut and formed, the heat conduction blocks are symmetrically arranged on two sides of the water guide plate, water storage cavities are arranged in the heat conduction blocks, water guide pipes communicated with the water storage cavities are arranged in the water guide plate, and sealing covers are welded at the bottoms of the heat conduction blocks and the water guide plate. At least one water injection opening is formed in the position, corresponding to the water storage cavity, of the sealing cover, a boss is arranged on the heat conduction block, a pole column groove is formed in the boss, and fixing through holes are symmetrically formed in the heat conduction block. The battery top cover has the advantages that the melting and deformation phenomena of the battery top cover plastic part are avoided, the temperature of the battery top cover is effectively reduced, so that the sealing performance of the battery top cover plastic part is improved, the sealing performance of the battery is improved, the normal and safe use of the battery is ensured, and meanwhile, the heat conduction layer is coated on the upper surface of the pole groove, so that the heat conduction coefficient is increased, and the service life of the battery is prolonged. And the problem that the battery top cover is damaged is also avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery top cover pole laser welding auxiliary equipment, and in particular relates to a water-cooled heat conduction mechanism for battery top cover pole laser welding. Background Art

[0002] In the welding process of connecting the battery pole ear and the top cover pole, the number of pole ear layers is 0.006mm×106 layers. After pre-welding by ultrasonic welding, the pole ear and the battery top cover pole are welded by laser welding. In order to ensure that the melting depth is greater than 0.3mm and the melting width is greater than 3mm, two welding methods are used in the welding process. The first laser welding power is 2800w×60%, and the second laser welding power is 2800w×100%. During the welding process, the temperature instantly absorbed by the top cover plastic part is greater than the melting point of the plastic part 230℃. After the plastic part of the copper pole column of the battery top cover is subjected to the heat generated by laser welding, the temperature of the battery top cover is too high, and the plastic part of the battery top cover is prone to melting and deformation, thereby reducing the sealing performance of the battery top cover plastic part, thereby reducing the sealing of the battery and reducing the safety of the battery during use. Utility Model Content

[0003] The utility model aims to provide a water-cooled heat-conducting mechanism for laser welding of battery top cover poles, so as to solve the problem in the prior art that after the plastic parts of the copper poles of the battery top cover are subjected to the heat generated by laser welding, the temperature of the battery top cover is too high, the plastic parts of the battery top cover are easily melted and deformed, thereby reducing the sealing performance of the plastic parts of the battery top cover, thereby reducing the sealing performance of the battery and reducing the safety of the battery when in use.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is: a water-cooled heat-conducting mechanism for laser welding of battery top cover poles, comprising a heat-conducting block and a water guide plate that are integrally cut and formed, the heat-conducting blocks are symmetrically arranged on both sides of the water guide plate, a water storage cavity is provided in the heat-conducting block, a water guide pipe connected to the water storage cavity is provided in the water guide plate, a cover is welded to the bottom of the heat-conducting block and the water guide plate, at least one water injection port is provided at the corresponding position of the cover and the water storage cavity, a boss is provided on the heat-conducting block, a pole groove is provided on the boss, and fixing through holes are symmetrically provided on the heat-conducting block.

[0005] Preferably, a thermal conductive coating is provided on the pole groove, and the thickness of the thermal conductive coating is 2 mm-4 mm.

[0006] Preferably, the distance from the pole groove to the top of the water storage chamber is 16 mm-19 mm.

[0007] Preferably, the height of the pole groove is 13 mm-17 mm.

[0008] Preferably, the heat conducting block is symmetrically provided with limiting column grooves, the limiting column grooves are provided with limiting fixing holes, and the limiting column grooves are fixedly connected with limiting columns that match the shapes thereof.

[0009] Preferably, the height of the limiting column is greater than the height of the boss.

[0010] Preferably, a limiting baffle is integrally formed on one side of the limiting column.

[0011] Preferably, the heat conductive block has a "U"-shaped structure.

[0012] The utility model has the advantages that: through the cooperation between the heat conduction block and the water storage cavity and the circulating water pipe arranged in the water guide plate, the battery top cover is cooled during laser welding by means of metal heat conduction and circulating water cooling. After the battery top cover pole and pole ear are laser welded, the temperature of the battery top cover can be reduced to below 40 degrees in a short time. During the welding process, the heat generated during the laser welding process is conducted out by the heat conduction mechanism, the temperature of the pole and the battery top cover metal is reduced, and the temperature of the plastic part is made lower than the melting point of 230°C, thereby avoiding the melting and deformation of the battery top cover plastic part, effectively reducing the temperature of the battery top cover, thereby improving the sealing performance of the battery top cover plastic part, improving the sealing of the battery, and ensuring the normal and safe use of the battery. At the same time, a heat conduction layer is coated on the upper surface of the pole groove, which not only increases the thermal conductivity coefficient, but also avoids the problem of battery top cover damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0014] Figure 2 It is a three-dimensional structural schematic diagram of the bottom surface of the utility model.

[0015] Figure 3 It is a side structural schematic diagram of the utility model.

[0016] Figure 4 It is a schematic diagram of the top structure of the utility model.

[0017] Figure 5 It is a schematic cross-sectional structural diagram of AA of the utility model.

[0018] Figure 6 It is a cross-sectional structural schematic diagram of BB of the present utility model.

[0019] Figure 7 It is a schematic cross-sectional structural diagram of CC of the present utility model.

[0020] Figure 8 It is a structural schematic diagram of the limit column of the utility model.

[0021] The meanings of the reference numerals are as follows: heat conducting block (1), water guide plate (2), water storage chamber (3), water guide pipe (4), cover (5), water inlet (6), boss (7), pole column groove (8), fixing through hole (9), heat conducting coating (10), limit column groove (11), limit fixing hole (12), limit column (13), limit baffle (14). DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figures 1 to 8 The water-cooled heat conduction mechanism for laser welding of the battery top cover pole shown in the figure comprises a heat conduction block 1 and a water guide plate 2 which are integrally cut and formed. The heat conduction block 1 is symmetrically arranged on both sides of the water guide plate 2. A water storage cavity 3 is arranged in the heat conduction block 1. A water guide pipe 4 which is connected to the water storage cavity 3 is arranged in the water guide plate 2. A cover 5 is welded to the bottom of the heat conduction block 1 and the water guide plate 2. The cover 5 is welded to the bottom of the water storage cavity 3 and the water guide pipe 4 to seal the water storage cavity 3 and the water guide pipe 4. At least one water injection port is arranged at the corresponding position of the cover 5 and the water storage cavity 3. If it is necessary to increase the water circulation rate and strengthen the flow of circulating water, the water injection ports 6 on both sides of the cover 5 can be increased to 2. By adding one water injection port 6, the water injection port 6 is connected to the circulating water tank of the laser welding device through a circulating water pipe. Under the action of the water pump, the circulating water is injected into the water storage chamber 3 through the water injection port 6 on one side of the cover 5, and discharged through the water injection port 6 on the other side and flows into the circulating water tank. A boss 7 is provided on the heat conductive block 1, and a pole groove 8 is provided on the boss 7. The heat conductive block 1 is symmetrically provided with fixed through holes 9.

[0024] In order to increase the thermal conductivity and avoid the problem of battery top cover damage, a thermal conductive coating 10 is provided on the pole groove 8. The thickness of the thermal conductive coating 10 is 2mm-4mm. The thermal conductive coating is a mixed material of rubber and graphite. The rubber is elastic and can ensure that the battery top cover will not be damaged when the pressure cover assembly is pressed down. The graphite has thermal conductivity, which further improves the thermal conductive effect of the thermal conductive structure.

[0025] In order to improve the heat conduction and cooling effect of circulating water cooling on the battery top cover, the distance from the pole groove 8 to the top of the water storage chamber 3 is set to 16mm-19mm. The distance between the pole groove 8 and the water storage chamber 3 is short, which can effectively improve the cooling effect of the heat conduction mechanism.

[0026] In order to ensure that the pole on the battery top cover can be exactly against the pole groove 8 and no damage is caused to the pole and the battery top cover, the height of the pole groove 8 is set to 13mm-17mm.

[0027] In order to limit the battery top cover placed on the boss 7, limiting column grooves 11 are symmetrically provided on the heat conductive block 1, limiting fixing holes 12 are provided on the limiting column grooves 11, and limiting columns 13 matching their shapes are fixedly connected to the limiting column grooves 11. The four corners of the battery top cover are just fit between the four limiting columns 13 to ensure that they will not be displaced or shaken during the laser welding process.

[0028] In order to improve the limiting effect of the limiting column 13 on the battery top cover, the height of the limiting column 13 is set to be greater than the height of the boss 7, and a limiting baffle 14 is integrally formed on one side of the limiting column 13.

[0029] In order to reduce the weight of the water-cooled heat-conducting mechanism and facilitate its fixation, the heat-conducting block 1 is arranged in a "U"-shaped structure.

[0030] When the utility model is used: first, the integrally cut heat-conducting block 1 and water guide plate 2 are installed on the laser welding upper top platform through the fixed through hole 9, and the circulating water pipe is docked on the water injection port 6, so that the water in the water storage chamber 3 and the water guide pipe 4 forms a circulation, and the heat-conducting block 1 and the water guide plate 2 are continuously cooled; secondly, the battery top cover with the pole is placed upside down on the boss 7, and the battery top cover is limited by the limiting column 13 so that the welding surface of the pole faces upward, and the battery pack with the pole ears welded is placed on the tooling platforms on both sides of the heat-conducting mechanism, and the battery pole ears are placed against the pole welding surface; thirdly, the battery pack and the battery top cover are moved to the bottom of the laser welding device through the laser welding upper top platform, and the pressure cover assembly is pressed on the pole groove 8, It is best to press the battery tabs tightly onto the pole welding surface of the battery top cover, fix the tabs and the poles, weld the battery tabs and the poles of the battery top cover together through a laser welding device, and use metal heat conduction and circulating water cooling to cool the battery top cover during laser welding to ensure that the temperature of the heat conduction mechanism is between 23-30°C, so that the temperature of the plastic parts of the battery top cover is lower than the melting point of 230°C, avoiding the melting and deformation of the plastic parts of the battery top cover, effectively reducing the temperature of the battery top cover, thereby improving the sealing performance of the plastic parts of the battery top cover, improving the sealing of the battery, and ensuring the normal and safe use of the battery; finally, after the welding of the poles and battery tabs of the battery top cover is completed, the battery can be packaged.

[0031] The above is only a preferred example of the present invention, and the technical solution of the present invention is not limited thereto. It should be pointed out that for ordinary technicians in this field, under the technical inspiration provided by the present invention, as common knowledge in the field, other equivalent deformations and improvements can be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A water-cooled heat-conducting mechanism for laser welding of battery top cover poles, characterized in that: The invention comprises a heat conducting block (1) and a water guide plate (2) which are integrally cut and formed, wherein the heat conducting block (1) is symmetrically arranged on both sides of the water guide plate (2), a water storage cavity (3) is provided in the heat conducting block (1), a water guide pipe (4) which is connected to the water storage cavity (3) is provided in the water guide plate (2), a cover (5) is welded to the bottom of the heat conducting block (1) and the water guide plate (2), at least one water injection port (6) is provided at a position corresponding to the cover (5) and the water storage cavity (3), a boss (7) is provided on the heat conducting block (1), a pole groove (8) is provided on the boss (7), and fixing through holes (9) are symmetrically provided on the heat conducting block (1).

2. A water-cooled heat-conducting mechanism for laser welding of battery top cover poles as claimed in claim 1, characterized in that: A thermal conductive coating (10) is provided on the pole groove (8), and the thickness of the thermal conductive coating (10) is 2 mm to 4 mm.

3. A water-cooled heat-conducting mechanism for laser welding of battery top cover poles as claimed in claim 2, characterized in that: The distance from the pole groove (8) to the top of the water storage chamber (3) is 16 mm-19 mm.

4. A water-cooled heat-conducting mechanism for laser welding of battery top cover poles as claimed in claim 3, characterized in that: The height of the pole groove (8) is 13 mm to 17 mm.

5. A water-cooled heat-conducting mechanism for laser welding of battery top cover poles as claimed in claim 4, characterized in that: The heat conducting block (1) is symmetrically provided with limiting column grooves (11), the limiting column grooves (11) are provided with limiting fixing holes (12), and the limiting column grooves (11) are fixedly connected with limiting columns (13) whose shapes match the limiting column grooves (11).

6. A water-cooled heat-conducting mechanism for laser welding of battery top cover poles as claimed in claim 5, characterized in that: The height of the limiting column (13) is greater than the height of the boss (7).

7. A water-cooled heat-conducting mechanism for laser welding of battery top cover poles as claimed in claim 6, characterized in that: A limiting baffle (14) is integrally formed on one side of the limiting column (13).

8. A water-cooled heat-conducting mechanism for laser welding of battery top cover poles as claimed in claim 7, characterized in that: The heat conducting block (1) has a "U"-shaped structure.

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