Method for manufacturing cylindrical battery

Abstract

This invention relates to the field of battery technology, and in particular to a method for manufacturing a cylindrical battery, comprising the following steps: preparing a housing, a cell assembly, and an insulating component that fit together; installing the cell assembly and the insulating component into the housing; having the terminal post on the housing contact a first adapter plate in the cell assembly through a clearance hole in the insulating component; using an ultrasonic torque welding needle to extend from the insertion hole of the cell in the cell assembly to the welding area of ​​the first adapter plate to weld the first adapter plate to the terminal post; and then using a dispensing head of a dispensing device to extend from the insertion hole to the welding area to apply adhesive to the welding area, thus completing the battery manufacturing process. The adhesive application by the dispensing head covers and encapsulates the weld marks generated by ultrasonic welding within the welding area, effectively preventing the risk of short circuits caused by burrs or metal shavings piercing the cell separator.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a method for preparing a cylindrical battery. Background Technology

[0002] With the development of new energy vehicles, high-energy-density and low-cost batteries have become a development trend. Currently, in the manufacturing process of cylindrical batteries, the connection between the adapter plate and the terminal of the first polarity is generally achieved using ultrasonic torque welding. During ultrasonic torque welding, defects such as burrs and metal shavings are easily generated around the weld, which poses a risk of puncturing the cell separator and causing a short circuit in the battery. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a cylindrical battery, which effectively prevents the risk of the separator of the cylindrical cell being easily punctured after the adapter piece is welded.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A method for preparing a cylindrical battery includes the following steps:

[0006] A cylindrical shell is prepared, one end of which is open and the other end of which is provided with a pole post through hole. The pole post is insulated and disposed in the pole post through hole.

[0007] A battery cell assembly is prepared, the battery cell assembly including a cylindrical battery cell and a first adapter piece fixed to one end of the cylindrical battery cell; the first adapter piece has a welding area on the side facing the cylindrical battery cell, and the cylindrical battery cell has a plug hole connecting the front and rear end faces;

[0008] An insulating component is prepared, which can cover the side of the first adapter piece away from the cylindrical battery cell; the insulating component is provided with avoidance holes for welding the first adapter piece to the electrode post;

[0009] The cell assembly and the insulating component are inserted from the opening end of the housing, such that the first adapter piece contacts the electrode post through the avoidance hole; the avoidance hole, the soldering area, and the insertion hole are vertically aligned;

[0010] An ultrasonic torque welding needle is inserted into the welding area through the insertion hole to weld the first adapter piece to the pole post. After welding is completed, the ultrasonic torque welding needle is returned to its original position.

[0011] The dispensing head of the dispensing device extends from the insertion hole into the welding area to apply adhesive to the welding area.

[0012] Preferably, the dispensing device further includes a glue tube and a hot melt tank. One end of the glue tube is connected to the hot melt tank, and the other end of the glue tube is connected to the dispensing head. The dispensing head is equipped with a heating wire to maintain the temperature of the dispensing head at 200-300 degrees Celsius, so that the glue has sufficient fluidity and can flow to the solder mark in the welding area. The temperature of the glue tube is 190-210 degrees Celsius, and the fluidity of the glue is maintained by maintaining this temperature. The temperature of the hot melt tank is 180-200 degrees Celsius, and the hot melt tank preheats and melts the glue.

[0013] Preferably, the diameter of the tubing is 3-6 mm, and the diameter of the tubing is smaller than the diameter of the insertion hole.

[0014] Preferably, the outer surface of the hose is provided with a heat insulation layer. The heat insulation layer effectively prevents the hose from burning the insulating membrane on the inner wall of the insertion hole.

[0015] Preferably, the thermal conductivity of the insulation layer is less than 0.05 W / (M·K), and the thickness of the insulation layer is 100-300 micrometers.

[0016] Preferably, the battery cell assembly further includes a second adapter plate fixed to the other end of the cylindrical battery cell; the second adapter plate has an inner hole aligned with the insertion hole. After the adhesive is applied, the dispensing nozzle of the dispensing head rubs against the second adapter plate to cut the adhesive filament. After the dispensing head is applied, it rises to easily pull out the adhesive filament. By rubbing the dispensing head against the second adapter plate to cut the adhesive filament, the adhesive filament is effectively prevented from flowing to other locations and affecting other assembly processes, such as flowing to the shell opening and affecting the laser welding of the shell and cover plate.

[0017] Preferably, the battery cell assembly further includes a second adapter piece fixed to the other end of the cylindrical battery cell; the second adapter piece is provided with an inner hole aligned with the insertion hole, and the side wall of the inner hole is provided with a shaving groove; after the glue is applied, the glue dispensing nozzle of the dispensing head cooperates with the shaving groove to cut the glue filaments. After the glue is applied, the dispensing head rises to easily pull the glue filaments, and by contacting the dispensing head with the shaving groove to cut the glue filaments, the glue filaments can be effectively prevented from flowing into other locations.

[0018] Preferably, the dispensing head has an air hole at the dispensing opening, which can spray hot air to cut the glue thread. After the glue is applied, the dispensing head rises to form a string, and hot air is sprayed through the air hole to cut the glue thread, which can effectively prevent the glue thread from flowing to other locations.

[0019] Preferably, the dispensing head applies adhesive to the welding area to form an adhesive layer, the adhesive layer having a thickness of 0.1-2 mm and an area larger than the solder mark area. The adhesive layer covers the solder mark generated by ultrasonic welding within the welding area, effectively preventing burrs and metal shavings from piercing the cylindrical battery cell separator.

[0020] Preferably, the adhesive layer is a polymer insulating component. Examples include polyacrylic acid type, polyurethane type, and polyolefin type, with polyolefin type hot melt adhesives exhibiting the best electrolyte resistance.

[0021] The beneficial effects of this invention are as follows: This invention provides a method for manufacturing a cylindrical battery, which involves preparing a housing, a cell assembly, and an insulating component that fit together. The cell assembly and the insulating component are then installed into the housing. The terminal post on the housing contacts the first adapter piece in the cell assembly through a clearance hole in the insulating component. An ultrasonic torque welding needle is inserted from the insertion hole of the cell in the cell assembly into the welding area of ​​the first adapter piece to weld the first adapter piece to the terminal post. Then, a dispensing head of a dispensing device is inserted from the insertion hole into the welding area to apply adhesive to the welding area. The adhesive applied by the dispensing head covers and encapsulates the weld marks generated by ultrasonic welding in the welding area, thereby effectively preventing the risk of short circuit caused by burrs and metal chips generated during welding piercing the cylindrical cell separator. Attached Figure Description

[0022] Figure 1 This is an exploded three-dimensional structural diagram of the housing and battery cell assembly in this invention.

[0023] Figure 2 This is an exploded three-dimensional structural diagram of the cylindrical battery cell and the first adapter plate in this invention.

[0024] Figure 3 This is a cross-sectional view of the side structure of the cylindrical battery of the present invention after the ultrasonic torque welding needle is inserted through the insertion hole.

[0025] Figure 4 This is a cross-sectional view of the side structure of the cylindrical battery of the present invention after the dispensing head extends into the insertion hole.

[0026] The attached figures are labeled as follows:

[0027] Cylindrical shell-1, pole post-11;

[0028] Battery cell assembly-2, cylindrical battery cell-21, first adapter plate-22, insulating component-23, welding area-24, avoidance hole-25, insertion hole-26, second adapter plate-27;

[0029] Ultrasonic torque welding needle-3;

[0030] Dispensing head-4, dispensing tube-41. Detailed Implementation

[0031] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0032] Currently, the connection between the first polarity adapter plate and the terminal post of cylindrical batteries is generally achieved using ultrasonic torque welding. During ultrasonic torque welding, defects such as burrs and metal shavings are easily generated around the weld, which poses a risk of puncturing the cell separator and causing a short circuit in the battery.

[0033] Based on the above-mentioned technical problems, the inventor devised the technical solution of Embodiment 1 to solve them.

[0034] Example 1:

[0035] like Figures 1 to 4 As shown, a method for preparing a cylindrical battery includes the following steps:

[0036] A cylindrical shell 1 is prepared, one end of which is open and the other end of which is provided with a pole post through hole. The pole post 11 is insulatedly disposed in the pole post through hole.

[0037] Prepare a battery cell assembly 2, the battery cell assembly 2 including a cylindrical battery cell 21 and a first adapter piece 22 fixed to one end of the cylindrical battery cell 21; the first adapter piece 22 is provided with a welding area 24 on the side facing the cylindrical battery cell 21, and the cylindrical battery cell 21 is provided with a plug hole 26 connecting the front and rear end faces;

[0038] An insulating component 23 is prepared, which can cover the side of the first adapter piece 22 away from the cylindrical cell 21; the insulating component 23 is provided with a bypass hole 25 for welding the first adapter piece 22 to the electrode post 11;

[0039] The cell assembly 2 and the insulating component 23 are inserted from the opening end of the housing 1, so that the first adapter piece 22 contacts the pole post 11 through the avoidance hole 25; the avoidance hole 25, the welding area 24 and the insertion hole 26 are vertically aligned;

[0040] An ultrasonic torque welding needle 3 is inserted from the insertion hole 26 into the welding area 24 to weld the first adapter piece 22 to the pole post 11; after welding is completed, the ultrasonic torque welding needle 3 is returned to its original position.

[0041] The dispensing head 4 of the dispensing device extends from the insertion hole 26 into the welding area 24 to apply adhesive to the welding area 24.

[0042] The method for manufacturing a cylindrical battery in this embodiment involves preparing a housing 1, a cell assembly 2, and an insulator 23 that fit together. The cell assembly 2 and the insulator 23 are then installed into the housing 1. The terminal post 11 on the housing 1 contacts the first adapter piece 22 in the cell assembly 2 through the avoidance hole 25 of the insulator 23. An ultrasonic torque welding needle 3 is inserted from the insertion hole 26 of the cell in the cell assembly 2 into the welding area 24 of the first adapter piece 22 to weld the first adapter piece 22 to the terminal post 11. Then, a dispensing head 4 of a dispensing device is inserted from the insertion hole 26 into the welding area 24 to apply adhesive to the welding area 24. The adhesive applied by the dispensing head 4 covers and encapsulates the weld marks generated by ultrasonic welding in the welding area 24, thereby effectively preventing the risk of short circuit caused by burrs and metal chips generated during welding piercing the separator of the cylindrical cell 21.

[0043] In this embodiment, the dispensing device further includes a glue tube 41 and a hot melt barrel. One end of the glue tube 41 is connected to the hot melt barrel, and the other end of the glue tube is connected to the dispensing head 4. The diameter of the glue tube 41 is smaller than the diameter of the insertion hole 26, and the glue tube 41 is preferably 5 mm. The dispensing head 4 is equipped with a heating wire to maintain the temperature of the dispensing head 4 at 200 degrees Celsius, so that the glue has sufficient fluidity and can flow to the solder mark on the welding area 24. The temperature of the glue tube 41 is 200 degrees Celsius, and the fluidity of the glue is maintained by maintaining this temperature. The temperature of the hot melt barrel is 190 degrees Celsius, and the hot melt barrel preheats and melts the glue.

[0044] In this embodiment, when the battery cell height is relatively high, after the dispensing head 4 extends into the insertion hole 26, the adhesive tube 41 will also partially extend into the insertion hole 26. At this time, the adhesive tube 41 will touch the inner wall of the insertion hole 26. The outer surface of the adhesive tube 41 in this application is provided with a heat insulation layer. The thermal conductivity of the heat insulation layer is less than 0.05 W / (M·K), and the thickness of the heat insulation layer is 130 micrometers. The heat insulation layer effectively prevents the adhesive tube 41 from burning the insulating membrane on the inner wall of the insertion hole 26.

[0045] In this embodiment, the dispensing head 4 forms an adhesive layer on the welding area 24. The adhesive layer is 1.2 mm thick and is a polymer insulating component 23, preferably a polyolefin-type hot melt adhesive. The area of ​​the adhesive layer is larger than the area of ​​the solder mark. The adhesive layer covers the solder mark generated by ultrasonic welding in the welding area 24, effectively preventing burrs and metal chips generated during welding from piercing the diaphragm of the cylindrical battery cell 21.

[0046] In the application of the technical solution of Embodiment 1, the inventors discovered that after the dispensing head 4 completes the glue application, it rises and becomes easy to pull out threads. To prevent the glue threads generated by the dispensing device from pulling out the cylindrical battery cell 21 from flowing to other locations and affecting other assembly processes, such as flowing to the shell opening and affecting the laser welding of the shell 1 and the cover plate, the inventors further conceived the following embodiment technical solution, referring to... Figures 1 to 4 .

[0047] Example 2:

[0048] The battery cell assembly 2 further includes a second adapter piece 27 fixed to the other end of the cylindrical battery cell 21; the second adapter piece 27 is provided with an inner hole aligned with the insertion hole 26, and the side wall of the inner hole is provided with a shaving groove; after the glue is applied, the glue dispensing nozzle of the dispensing head 4 engages with the shaving groove to cut the glue filaments. By contacting the dispensing head 4 with the shaving groove to cut the glue filaments, the glue filaments can also be effectively prevented from flowing into other locations.

[0049] Example 3:

[0050] The dispensing head 4 has an air hole at its dispensing opening, which can eject hot air to cut the adhesive thread. This hot air ejection also effectively prevents the adhesive thread from flowing to other locations. The air hole is connected to a gas generating device, which generates hot air (temperature greater than 100 degrees Celsius) and supplies it to the air hole.

[0051] In the description of this invention, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing a cylindrical battery, characterized in that, Includes the following steps: Prepare a cylindrical shell (1), one end of the shell (1) is open, and the other end of the shell (1) is provided with a pole post through hole, and the pole post (11) is insulatedly disposed in the pole post through hole; Prepare a battery cell assembly (2), the battery cell assembly (2) includes a cylindrical battery cell (21) and a first adapter piece (22) fixed to one end of the cylindrical battery cell (21); the first adapter piece (22) has a welding area (24) on the side facing the cylindrical battery cell (21), and the cylindrical battery cell (21) has a plug hole (26) connecting the front and rear end faces; An insulating component (23) is prepared, which can cover the side of the first adapter piece (22) away from the cylindrical cell (21); the insulating component (23) is provided with a bypass hole (25) for welding the first adapter piece (22) to the pole piece (11); The cell assembly (2) and the insulator (23) are inserted from the opening end of the housing (1) so that the first adapter piece (22) contacts the pole (11) through the avoidance hole (25); the avoidance hole (25), the welding area (24) and the plug hole (26) are vertically aligned; Using an ultrasonic torque welding needle (3), the first adapter piece (22) is inserted from the insertion hole (26) into the welding area (24) to weld the electrode post (11). After the welding is completed, the ultrasonic torque welding needle (3) is returned to its original position. The dispensing head (4) of the dispensing device extends from the insertion hole (26) into the welding area (24) to apply adhesive to the welding area (24).

2. The method for preparing a cylindrical battery according to claim 1, characterized in that: The dispensing device also includes a glue tube (41) and a hot melt bucket. One end of the glue tube (41) is connected to the hot melt bucket, and the other end of the glue tube is connected to the dispensing head (4). During the glue application process, the temperature of the dispensing head (4) is 200-300 degrees Celsius, the temperature of the glue tube (41) is 190-210 degrees Celsius, and the temperature of the hot melt bucket is 180-200 degrees Celsius.

3. The method for preparing a cylindrical battery according to claim 2, characterized in that: The diameter of the tubing (41) is 3-6 mm.

4. The method for preparing a cylindrical battery according to claim 2, characterized in that: The outer surface of the hose (41) is provided with a heat insulation layer.

5. The method for preparing a cylindrical battery according to claim 4, characterized in that: The thermal conductivity of the insulation layer is less than 0.05 W / (M·K), and the thickness of the insulation layer is 100-300 micrometers.

6. The method for preparing a cylindrical battery according to claim 1, characterized in that: The battery cell assembly (2) also includes a second adapter piece (27) fixed at the other end of the cylindrical battery cell (21); the second adapter piece (27) is provided with an inner hole aligned with the insertion hole (26). After the glue is applied, the glue dispensing nozzle of the dispensing head (4) rubs against the second adapter piece (27) to cut the glue filament.

7. The method for preparing a cylindrical battery according to claim 1, characterized in that: The battery cell assembly (2) also includes a second adapter piece (27) fixed at the other end of the cylindrical battery cell (21); the second adapter piece (27) is provided with an inner hole aligned with the insertion hole (26), and the side wall of the inner hole is provided with a shaving groove; after the glue is applied, the glue outlet of the glue dispensing head (4) cooperates with the shaving groove to cut the glue filament.

8. The method for preparing a cylindrical battery according to claim 1, characterized in that: The dispensing head (4) has an air hole at the dispensing opening, which can spray gas to cut the glue thread.

9. The method for preparing a cylindrical battery according to claim 1, characterized in that: The dispensing head (4) forms an adhesive layer on the welding area (24), the adhesive layer having a thickness of 0.1-2 mm and an area larger than the solder area.

10. The method for preparing a cylindrical battery according to claim 9, characterized in that: The adhesive layer is a polymer insulating component (23).

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