CN206305603U - Ultrasonic welding device for connecting sheet of lug and cover plate of lithium ion battery - Google Patents

Abstract

The utility model discloses an ultrasonic welding device for a tab of a lithium ion battery and a connecting piece of a cover plate, an ultrasonic welding device for a tab of a lithium ion battery and a connecting piece of a cover plate, comprising a conveyor belt and an ultrasonic Welding machine, the conveyor belt is equidistantly provided with positioning slots for clamping the batteries, the conveyor belt is fixed with a welding seat below one side, and a bow-shaped pressure rod is provided above the other side; the bottom end of the pressure rod Connect the rotating shaft to the base, so that the top of the pressure rod rotates around the rotating shaft in the direction of the welding seat and just presses on the top of the welding seat; a pressure head is located directly above the welding seat, and the top of the pressure head is connected to the telescopic cylinder. The bottom of the indenter is provided with a groove, and a telescopic cutter is embedded in the bottom of the groove, and a slit corresponding to the top of the telescopic cutter is provided on the top surface of the welding seat. The utility model realizes the dual functions of cutting and welding the tabs, and reduces the pre-welding process of the tabs, thereby improving the welding efficiency.

Description

An ultrasonic welding device for tabs and cover plates of lithium-ion batteries

technical field

The utility model relates to the technical field of lithium-ion batteries, in particular to an ultrasonic welding device for a tab of a lithium-ion battery and a connecting piece of a cover plate.

Background technique

Lithium-ion batteries include cells, electrolyte, cover plates, cover plates, etc. The cells of lithium-ion batteries are made by stacking or winding positive electrodes, negative electrodes, and separators. The positive and negative electrodes are Laser cutting is used to process tabs at one end of the pole piece, and then the active material slurry is coated and solidified. Since the lithium-ion battery has many tabs, it greatly increases the difficulty of welding between the tabs and the connecting piece of the cover plate.

The current ultrasonic welding process between the tab and the cover plate includes: (1) ultrasonic pre-welding of the tab; (2) trimming of the tab; (3) trimmed tab and cover plate connection ultrasonic welding. This welding method not only has a complicated process, but also the pre-welding process will cause certain damage to the tabs, and the processing efficiency is low. However, the method involved in the utility model can be completed in one step, saves the pre-welding process, not only ensures the product quality but also improves the processing efficiency.

Utility model content

The purpose of the utility model is to solve the problem of difficult ultrasonic welding of the existing lithium-ion battery tab and the cover plate connection piece, and provide an ultrasonic welding device for the lithium-ion battery tab and the cover plate connection piece.

An ultrasonic welding device for tabs and cover plate connecting pieces of lithium-ion batteries, comprising a conveyor belt and an ultrasonic welding machine on a base, positioning grooves for clamping battery cells are provided at equal intervals on the conveyor belt, and the A welding seat is fixed under one side of the conveyor belt, and a bow-shaped pressing rod is arranged above the other side; the bottom end of the pressing rod is connected to the base through a rotating shaft, so that the top of the pressing rod rotates around the rotating shaft in the direction of the welding seat and just presses on it. The top of the welding seat; a pressure head is located directly above the welding seat, the top of the pressure head is connected to the telescopic cylinder, the bottom end of the pressure head is provided with a groove, and a telescopic As for the cutting knife, the top end surface of the welding seat is provided with a slit suitable for the top end of the telescopic cutting knife.

In a further solution, the telescopic cylinder is an air cylinder or a hydraulic cylinder.

In a further solution, one end of the welding seat located in the running direction of the conveyor belt is provided with a proximity switch for detecting battery cells, and the proximity switch is connected in series with the drive circuit of the conveyor belt.

In a further solution, the outer side of the positioning slot is telescopically provided with a tab supporting plate for supporting the tab of the battery cell, and the tab supporting plate is connected to the bottom end of the positioning slot through a telescopic piece.

In a further solution, the telescopic member includes a horizontally moving air cylinder or a hydraulic cylinder and a vertically moving air cylinder or liquid cylinder.

The top surface of the welding seat is flush with two-thirds of the end of the battery core placed horizontally.

The width of the telescopic cutter is larger than that of the lug; the welding head of the ultrasonic welding machine is a straight welding head, and the welding head is connected with the ultrasonic welding machine through a telescopic connecting rod. When ultrasonic welding is required, the connecting rod is stretched forward with the welding head, and can be retracted after welding.

During the operation of the battery core, the tabs of the battery core are supported by the tab support plate. Before welding, it is to prevent the tabs from being damaged by touching the soldering seat when it is transferred to the soldering seat; welding The last is to avoid damage to the tab due to the high gravity of the welded cover plate.

In addition, the tab support plate is controlled by a telescopic piece to move horizontally from the bottom of the positioning groove to protrude, and then move vertically to hold the tab.

The utility model realizes the dual functions of cutting the tabs and ultrasonic welding between the tabs and the cover plate, and reduces the pre-welding process of the tabs, so that the process of lithium-ion laminated batteries can achieve high-quality and high-efficiency effects .

Therefore, the welding device of the present invention has the advantages of high production efficiency and no damage to tabs.

Description of drawings

The following drawings attached to this specification and the above-mentioned content of the utility model play a role in understanding the idea of the utility model easily.

Fig. 1 is a structural representation of the utility model,

Fig. 2 is a schematic diagram of fixing the pressure rod and the pressure head to the lugs in the utility model,

Fig. 3 is a schematic diagram of the telescopic cutter cutting the tabs in the utility model,

Fig. 4 is a schematic diagram of the welding of the lug and the connecting piece of the cover plate in the utility model.

In the figure: 1-Conveyor belt, 2-Positioning groove, 3-Ear support plate, 4-Welding seat, 5-Indenter, 5.1-Telescopic cutter, 6-Telescopic cylinder, 7-Press bar, 8-Proximity switch , 9-cell, 9.1-ear, 10-cover, 10.1-cover connecting piece, 11-ultrasonic welding machine, 11.1-welding head, 12-base.

detailed description

In order to better understand the technical idea of the utility model, its specific implementation will be described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The terms used in this utility model should not be limitedly interpreted as common or dictionary meanings, but should be based on the principle that the inventor of the utility model can better explain his own utility model and properly define the concept of the term.

As shown in Figures 1-4, an ultrasonic welding device for tabs and cover plates of lithium-ion batteries includes a conveyor belt 1 and an ultrasonic welding machine 11 arranged on a base 12, and the conveyor belt 1 is equally spaced. There is a positioning groove 2 for clamping the electric core 9, a welding seat 4 is fixed under one side of the conveyor belt 1, and a bow-shaped pressing rod 7 is arranged above the other side; the bottom end of the pressing rod 7 passes through the rotating shaft (in the figure Not shown) is connected with the base 12, so that the top of the pressure rod 7 rotates around the rotating shaft in the direction of the welding seat 4 and just presses on the top of the welding seat 4; The top of the head 5 is connected to the telescopic cylinder 6, and the bottom end of the pressure head 5 is provided with a groove, and a telescopic cutter 5.1 (as shown in Figure 3 ) is embedded in the bottom end of the groove, and the welding seat 4 The top surface of the top end is provided with a slit suitable for the top end of the telescopic cutter 5.1.

In a further solution, the telescopic cylinder 6 is an air cylinder or a hydraulic cylinder.

In a further solution, one end of the welding seat 4 located in the running direction of the conveyor belt 1 is provided with a proximity switch 8 for detecting the electric core 9 , and the proximity switch 8 is connected in series in the driving circuit of the conveyor belt 1 .

In a further solution, the outer side of the positioning groove 2 is telescopically provided with a tab support plate 3 for supporting the tab 9.1 of the battery core 9, and the tab support plate 3 is connected to the bottom end of the positioning slot 2 through a telescopic piece .

In a further solution, the telescopic member includes a horizontally moving air cylinder or a hydraulic cylinder and a vertically moving air cylinder or liquid cylinder.

The top surface of the welding seat 4 is flush with two-thirds of the end of the battery core 9 placed horizontally.

The width of the telescopic cutter 5.1 is larger than the width of the lug 9.1; the welding head 11.1 of the ultrasonic welding machine 11 is a straight welding head, and the welding head 11.1 is connected with the ultrasonic welding machine 11 through a telescopic connecting rod .

The specific operation is as follows: place the cell 9 of the stacked lithium-ion battery in the positioning groove 2 on the conveyor belt 1, and the tab 9.1 of the cell 9 is installed on the tab support plate 3 at the bottom of the positioning slot 2 through a telescopic piece support; when the electric core 9 is delivered to the welding seat 4, the proximity switch 8 on the fixed welding seat 4 works, and the driving circuit of the conveyor belt 1 is disconnected, so that the conveyor belt 1 stops working, so that the electric core 9 is accurate Position it at the welding seat; then shrink the tab support plate 3 back, start the pressing rod 7, make the top of the pressing rod 7 run from top to bottom, and press down from the root of the tab to the tip of the tab. Then drive the pressure head 5 to move down through the telescopic cylinder 6 to press the tip of the pole ear 9.1, so that the pressure head 5 and the welding seat 4 press the pole ear 9.1 of the electric core 9 together; then start the pressure in the groove of the pressure head 5 The telescopic cutter 5.1 cuts the redundant part of the tab 9.1 downward (as shown in Figure 1.2.3). Move back pressure head 5 and telescopic cutter 5.1 after cutting, but still retain the depressed state of depression bar 7.

The cover plate 10 is transferred to the welding seat 4 by the cover plate conveying device or the manipulator, and the top end of the cover plate connecting piece 10.1 is aligned with the tab 9.1 of the battery cell 9, and the ultrasonic welding machine 11 is turned on, and the tab 9.1 and the cover plate are aligned. Ultrasonic welding is performed at the joint of the connecting piece 10.1 (as shown in FIG. 4 ). After the ultrasonic welding is completed, the pressure rod 7 is retracted, and the tab support plate 3 is stretched out to hold the tab 9.1 and the entire cover plate 10, and flow to the next process.

Any modification, equivalent replacement and improvement made within the technical idea of the utility model shall be included in the protection scope of the utility model.

Claims (7)

1. An ultrasonic welding device for a tab and a cover plate connecting piece of a lithium-ion battery, comprising a conveyor belt (1) and an ultrasonic welding machine (11) arranged on a base (12), characterized in that: the conveyor belt (1 ) are provided with positioning slots (2) at equal intervals for clamping the battery cells (9), the conveyor belt (1) is fixed with a welding seat (4) under one side, and a bow-shaped pressing rod ( 7); the bottom end of the pressing rod (7) is connected to the base (12) through the rotating shaft, so that the top end of the pressing rod (7) rotates around the rotating shaft in the direction of the welding seat (4) and just presses on the welding seat (4) on the top of the welding seat (4), there is a pressure head (5), the top of the pressure head (5) is connected with the telescopic cylinder (6), and the bottom end of the pressure head (5) is provided with a concave Groove, a telescopic cutter (5.1) is embedded in the bottom end of the groove, and a slit adapted to the top of the telescopic cutter (5.1) is provided on the top surface of the welding seat (4). 2. The ultrasonic welding device according to claim 1, characterized in that: the telescopic cylinder (6) is an air cylinder or a hydraulic cylinder. 3. The ultrasonic welding device according to claim 1, characterized in that: one end of the welding seat (4) located in the running direction of the conveyor belt (1) is provided with a proximity switch (8) for detecting the electric core (9), the The proximity switch (8) is connected in series in the drive circuit of the conveyor belt (1). 4. The ultrasonic welding device according to claim 1, characterized in that: the outer side of the positioning groove (2) is telescopically provided with a tab support plate for supporting the tab (9.1) of the cell (9) (3), the lug support plate (3) is connected to the bottom end of the positioning groove (2) through a telescopic piece. 5. The ultrasonic welding device according to claim 3, characterized in that: the telescopic member includes a horizontally moving air cylinder or a hydraulic cylinder and a vertically moving air cylinder or liquid cylinder. 6 . The ultrasonic welding device according to claim 1 , characterized in that: the top surface of the welding seat ( 4 ) is flat with two-thirds of the end of the electric core ( 9 ) placed horizontally. 7 . 7. The ultrasonic welding device according to claim 1, characterized in that: the width of the telescopic cutter (5.1) is larger than the width of the lug (9.1); the welding head of the ultrasonic welding machine (11) ( 11.1) is a straight welding head, and the welding head (11.1) is connected with the ultrasonic welding machine (11) through a telescopic connecting rod.