CN218487451U - Lithium battery tab ultrasonic welding preheating device - Google Patents

Abstract

The utility model discloses a lithium battery tab ultrasonic welding preheating device relates to the relevant technical field of lithium battery processing equipment. The utility model comprises a heating device and an electric core with a pole ear at the end part, wherein the heating device comprises a shell, an induction coil arranged in the shell and a plurality of sensors; the induction coil is rectangular wiring and is connected with a power supply access end arranged on the outer side of the shell, and the power supply access end is connected with the high-frequency power supply generator; the sensor in the direction of cell entering is used for detecting the entering of the tab, and the sensor in the direction of cell sending out is used for detecting the temperature of the heated tab. The utility model relates to a lithium battery tab ultrasonic welding preheating device can carry out the thermal treatment to the antipodal ear on line contactless, does not influence original production beat, has utmost point ear detection simultaneously, and the temperature detects, and functions such as heating temperature settlement.

Description

Lithium battery tab ultrasonic welding preheating device

Technical Field

The utility model relates to a relevant technical field of lithium cell processing equipment, more specifically say that it relates to a lithium battery tab ultrasonic welding preheating device.

Background

The quality of ultrasonic welding directly influences the charge and discharge performance of the battery core, and is one of the key processes of lithium battery manufacturing. With the increasing capacity of single lithium batteries, the number of the pole ear layers is increased, taking 12 micron aluminum foil as an example, the number of the pole ear layers is gradually increased from 20-60 layers to 60-100 layers, and the number of the individual batteries reaches more than 100 layers, thereby providing higher requirements for the ultrasonic welding process. For the tab welding of 80 layers or more, phenomena such as welding infirm and welding breakage begin to occur. The factors influencing the qualification rate and the reliability of the ultrasonic welding mainly have the following two aspects: (1) parameters of an ultrasonic welding machine: welding amplitude, welding pressure, welding frequency, welding time, ultrasonic equipment stability and the like; (2) substrate Properties: welding temperature, physical and chemical properties (material microstructure), etc.

Wherein the welding temperature has an important influence on the ultrasonic welding, and the preheating of the welding workpiece can improve the welding quality. This is because raising the welding temperature can reduce the stress at which plastic flow starts at the time of welding, increase the driving force for diffusion and recrystallization at the interface, and thereby easily achieve intermetallic bonding. It is generally believed that within a proper negative temperature, there is a positive correlation between the welding temperature and the weld seam rate. As the preheating temperature increases, the mechanical properties of the weld bead also increase.

At present, the lithium battery ultrasonic welding process is mainly used for welding at room temperature in the industry, and a technology for increasing the temperature during ultrasonic welding by adding a preheating process is not available. Because the ultrasonic welding of the lithium battery is the assembly line operation, the tab area is small, the welding beat is fast, and the common heating mode has the defect of difficult application.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes when current lithium battery tab ultrasonic bonding, because utmost point ear region is little, the welding beat is fast, lead to utmost point ear to preheat the not enough that the degree of difficulty is big, provide a lithium battery tab ultrasonic welding preheating device, it can online contactless counter electrode ear add thermal treatment in advance, does not influence original production beat, has utmost point ear detection simultaneously, and the temperature detects, and heating temperature sets for, improves the ultrasonic welding utmost point ear number of piles to and welded quality.

In order to solve the technical problem, the utility model discloses a following technical scheme: a lithium battery tab ultrasonic welding preheating device comprises a heating device and a battery core with a tab arranged at the end part, wherein the heating device comprises a shell, an induction coil arranged in the shell and a plurality of sensors; the induction coil is rectangular wiring and is connected with a power supply access end arranged on the outer side of the shell, and the power supply access end is connected with the high-frequency power supply generator; the sensor in the battery cell entering direction is used for detecting the entering of the lug, and the sensor in the battery cell sending direction is used for detecting the temperature of the heated lug. The utility model relates to a lithium battery tab ultrasonic welding preheating device can carry out the thermal treatment to the antipodal ear on line contactless, does not influence original production beat, has utmost point ear detection simultaneously, and the temperature detects, and functions such as heating temperature settlement.

Preferably, the induction coil is made of 1-3mm thick copper wires, and the wiring distance is 4mm.

Preferably, the shell is provided with a cover plate, and the cover plate is made of insulating materials. The cover plate material, such as microcrystalline glass, PET, PP and other insulating materials with strong magnetic line penetration, plays a role in isolating the induction coil and the pole lug, and has the functions of preventing electric shock, scalding and foreign bodies.

Preferably, the sensor comprises a photosensor and a temperature sensor. The battery cell entering direction is provided with a photoelectric sensor which can detect whether a lug enters or not, and the battery cell leaving direction is provided with a temperature sensor which can detect the temperature of the heated lug.

Preferably, the heating device further comprises an adjusting device for adjusting the position of the heating device, and the adjusting device comprises a base, and a first adjusting device and a second adjusting device which are arranged on the base. The design of the adjusting device can realize the adjustment of the up-down position and the front-back position of the heating device.

Preferably, the first adjusting device comprises a motor arranged in the base, a screw rod arranged on an output shaft of the motor, an adjusting support arranged on the screw rod, a plurality of telescopic rods arranged on the adjusting support in a sliding manner, an installation box arranged on the telescopic rod structure, and a heating device arranged in the installation box. When the heating device needs to be adjusted in the vertical position, the motor is started to drive the lead screw to rotate, and the lead screw rotates to drive the adjusting support, the telescopic rod and the mounting box to move up and down, so that the heating device is driven to achieve position adjustment.

Preferably, the second adjusting device comprises a piston cylinder arranged on the adjusting support, a piston rod on the piston rod is connected with the mounting box, one end of the telescopic rod is slidably mounted on the adjusting support, and the other end of the telescopic rod is connected with the bottom wall of the mounting box. When the heating device needs to adjust the front position and the rear position, the piston rod is started, and the piston cylinder is started to drive the piston rod to stretch out and draw back, so that the installation box and the heating device are driven to move and adjust the front position and the rear position.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model relates to a lithium battery tab ultrasonic welding preheating device can carry out the thermal treatment to utmost point ear on line contactless, does not influence original production beat, has utmost point ear detection simultaneously, and the temperature detects, and functions such as heating temperature settlement.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is a top view of the heating device and regulating device combination of the present invention;

FIG. 3 is an isometric view of the heating device and adjustment device combination of the present invention;

FIG. 4 is a side view of the heating unit and adjustment unit combination of the present invention;

in the figure: 1, a tab; a battery core 2; a housing 3; an induction coil 4; a heating device 5; a power supply access terminal 6; a high-frequency power generator 7; a cover plate 8; a photosensor 9; a temperature sensor 10; the adjusting device 200; a base 201; a motor 202; a screw rod 203; an adjustment bracket 204; an extension rod 205; an installation box 206; a chute 207; a guide rod 208; a piston cylinder 209.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

example 1: a lithium battery tab ultrasonic welding preheating device (see attached figure 1) comprises a heating device and a battery core 2 with the end part connected with a tab 1, wherein the heating device 5 comprises a shell 3, an induction coil 4 arranged in the shell and two sensors; the induction coil adopts rectangular wiring and is connected with a power supply access end 6 arranged at the side of the shell 3, the power supply access end 6 is connected with a high-frequency power supply generator 7, the induction coil adopts a thick copper wire with the thickness of 1-3mm, and the wiring distance is 4mm; be equipped with apron 8 on the casing 3, apron 8 adopts insulating material, and induction coil 4 is located utmost point ear 1 rear side, and about 5mm department above induction coil 4 is heating device's apron 8. The cover plate 8 is made of materials such as microcrystalline glass, PET, PP and the like which are insulated but have strong magnetic line of force penetration, plays a role in isolating the induction coil and the pole lug, and has the functions of preventing electric shock, scalding and foreign bodies. The sensor comprises a photoelectric sensor 9 and a temperature sensor 10, the photoelectric sensor is arranged in the direction of the battery cell entering to detect whether a tab enters, and the temperature sensor is arranged in the direction of the battery cell leaving to detect the temperature of the heated tab. The arrow on the right side of the battery cell 2 is the moving direction of the battery cell.

The utility model relates to a lithium battery tab ultrasonic welding preheating device can carry out the thermal treatment to utmost point ear on line contactless, does not influence original production beat, has utmost point ear detection simultaneously, and the temperature detects, and functions such as heating temperature settlement.

The preset power is calculated based on the input data and the empirical parameters, and the calculation is disclosed as follows:

P≥k*W*H*V*C*(T1-T2)*10-9

the running speed of the battery cell is V, m/s; the thickness of the foil is W, um; width L, mm; height H, mm

Carrying out high-density rho, kg/m cultivation; specific heat capacity C, J/kg DEG C; initial temperature T0, DEG C; target temperature T1,. Degree.C

Presetting power P, W; an empirical coefficient k; the empirical coefficient k may be set to be between 20 and 100.

For power supply selection, the power P is less than or equal to 100W, the frequency is preferably more than or equal to 200HZ, the skin effect is favorably enhanced, and the welding quality of the lugs is good.

The target temperature is not more than 100 ℃, the performance of the battery core is influenced by overhigh temperature, the specific temperature needs to be verified through experiments, and if the time from preheating to ultrasonic welding is not more than 2 seconds, the optimal preheating temperature is 50-75 ℃, the preheating is carried out for 2-5 seconds, and the optimal preheating temperature is 70-85 ℃, taking 12-micron aluminum foil as an example.

All the above related parameter settings can be completed on the power panel.

Specific example 2:

in this embodiment, an adjusting device is added on the basis of embodiment 1 (see fig. 1-4), the heating device is mounted on the adjusting device, and the adjusting device 200 includes a base 201, and a first adjusting device and a second adjusting device disposed on the base. The design of the adjusting device can realize the adjustment of the up-down position and the front-back position of the heating device.

First adjusting device is including setting up motor 202 in the base, set up lead screw 203 on motor output shaft, set up regulation support 204 on the lead screw, it sets up a plurality of telescopic links 205 on adjusting the support to slide, set up in the structural install bin 206 of telescopic link, heating device sets up in the install bin, be equipped with spout 207 in the base, the motor sets up on spout upside inner wall, the lead screw is installed on motor output shaft, lead screw left and right sides parallel arrangement has with regulation support sliding connection lead slide bar 208, it is "U" shape structure to adjust the support, it is equipped with the telescopic link to slide in the U-shaped terminal surface of stretching out of regulation support both sides, the end and the install bin bottom fixed mounting that stretch out of telescopic link. When the heating device needs to be adjusted in the vertical position, the motor is started to drive the lead screw to rotate, and the lead screw rotates to drive the adjusting support, the telescopic rod and the mounting box to move up and down, so that the heating device is driven to achieve position adjustment.

The second adjusting device comprises a piston cylinder 209 arranged on the adjusting support, a piston rod on the piston rod is connected with the installation box, one end of the telescopic rod is slidably arranged on the adjusting support, and the other end of the telescopic rod is connected with the bottom wall of the installation box. When the heating device needs to adjust the front position and the rear position, the piston rod is started, and the piston cylinder is started to drive the piston rod to stretch out and draw back, so that the installation box and the heating device are driven to move and adjust the front position and the rear position.

The above-described embodiments are merely preferred and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (7)

1. A lithium battery tab ultrasonic welding preheating device comprises a heating device and an electric core with a tab arranged at the end part, and is characterized in that the heating device comprises a shell, an induction coil arranged in the shell and a plurality of sensors; the induction coil adopts rectangular wiring and is connected with a power supply access end arranged on the outer side of the shell, and the power supply access end is connected with a high-frequency power supply generator; the sensor in the battery cell entering direction is used for detecting the entering of the lug, and the sensor in the battery cell sending direction is used for detecting the temperature of the heated lug.

2. The ultrasonic welding preheating device for the lithium battery tab as claimed in claim 1, wherein the induction coil is made of a thick copper wire with a 1-3mm wire spacing of 4mm.

3. The ultrasonic welding preheating device for the lithium battery tab as claimed in claim 1, wherein a cover plate is disposed on the housing, and the cover plate is made of an insulating material.

4. The ultrasonic welding preheating device for the lithium battery tab as claimed in claim 1, wherein the sensor comprises a photoelectric sensor and a temperature sensor.

5. The ultrasonic welding preheating device for the lithium battery tab as claimed in any one of claims 1 to 4, further comprising an adjusting device for adjusting the position of the heating device, wherein the adjusting device comprises a base, a first adjusting device and a second adjusting device, the first adjusting device and the second adjusting device are arranged on the base.

6. The ultrasonic welding preheating device for the pole lugs of the lithium battery as claimed in claim 5, wherein the first adjusting device comprises a motor arranged in a base, a screw rod arranged on an output shaft of the motor, an adjusting bracket arranged on the screw rod, a plurality of telescopic rods slidably arranged on the adjusting bracket, an installation box arranged on a telescopic rod structure, and a heating device arranged in the installation box.

7. The preheating device for ultrasonic welding of the pole lug of the lithium battery as claimed in claim 6, wherein the second adjusting device comprises a piston cylinder arranged on the adjusting support, a piston rod on the piston rod is connected with the mounting box, one end of the telescopic rod is slidably mounted on the adjusting support, and the other end of the telescopic rod is connected with the bottom wall of the mounting box.

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