Laser welding tool for square lithium battery pack

Abstract

The utility model discloses a laser welding tool for a square lithium battery pack, which comprises a shell, battery cells are uniformly mounted in the shell, pole columns are arranged on the battery cells, and aluminum bars are welded on the pole columns; a bottom plate is arranged at the top of the battery cell, slotted holes for accommodating pole columns and aluminum bars are uniformly formed in the bottom plate, and a plurality of positioning pins are uniformly mounted on the upper surface of the bottom plate; the position between the aluminum bar and the pole is limited through the bottom plate, then the aluminum bar is pressed through the cover plate, the situation of position deviation of the aluminum bar is avoided, then laser welding work can be carried out through the through hole in the cover plate, and the device effectively avoids the undesirable phenomena of hole explosion, insufficient welding and the like.

Description

Technical Field

[0001] This utility model relates to the field of battery pack welding technology, specifically a laser welding fixture for a square lithium battery pack. Background Technology

[0002] Laser welding of square lithium batteries requires the aluminum bar and the cell terminal to fit tightly together, and also requires accurate positioning, that is, the center hole of the aluminum bar and the center hole of the cell terminal should be as concentric as possible, otherwise defects such as hole explosion and poor welding may occur.

[0003] To address this, a laser welding fixture for square lithium battery packs is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a laser welding fixture for a square lithium battery pack to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a laser welding fixture for a square lithium battery pack, comprising a housing, wherein battery cells are uniformly installed inside the housing, and each battery cell is provided with an electrode post, and an aluminum bar is welded onto the electrode post;

[0006] The top of the battery cell is provided with a base plate, and slots for accommodating the electrode posts and aluminum bars are evenly opened on the base plate. Multiple positioning pins are evenly installed on the upper surface of the base plate.

[0007] A cover plate is provided above the base plate, and through holes for laser welding are evenly provided on the cover plate. Positioning holes that are compatible with positioning pins are provided on the lower surface of the base plate.

[0008] Preferably, a plurality of first magnets are embedded in the upper surface of the base plate.

[0009] Preferably, a plurality of second magnets are embedded in the lower surface of the cover plate, and the positions of the plurality of first magnets and the plurality of second magnets correspond to each other.

[0010] Preferably, the lower surface of the cover plate is provided with a plurality of protrusions for pressing down the aluminum bar.

[0011] Preferably, a wire harness is installed between the plurality of aluminum bars.

[0012] Compared with the prior art, the beneficial effects of this utility model are: by restricting the position between the aluminum bar and the pole by the base plate, and then pressing the aluminum bar by the cover plate, the position deviation of the aluminum bar is avoided. Then, laser welding can be performed through the through hole on the cover plate. This device effectively avoids defects such as hole bursting and incomplete welding. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the base plate of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the cover plate of this utility model;

[0015] Figure 3 This is a schematic diagram of the structure after the base plate of this utility model has been placed;

[0016] Figure 4 This is a schematic diagram of the structure of the aluminum bar after placement;

[0017] Figure 5 This is a schematic diagram of the structure after the cover plate of this utility model has been placed.

[0018] In the diagram: 1. Base plate; 2. First magnet; 3. Positioning pin; 4. Slot; 5. Cover plate; 6. Boss; 7. Through hole; 8. Second magnet; 9. Positioning hole; 10. Housing; 11. Battery cell; 12. Terminal post; 13. Aluminum bar; 14. Wiring harness. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] Please see Figure 1-5 This utility model provides a technical solution: a laser welding fixture for a square lithium battery pack, including a housing 10, in which battery cells 11 are evenly installed, and each battery cell 11 is provided with a terminal post 12. The center of the terminal post 12 is provided with a center hole for easy welding. An aluminum bar 13 is welded on the terminal post 12, and a wire harness 14 is installed between multiple aluminum bars 13. The aluminum bar 13 is provided with an aluminum terminal for collecting data. One end is pressed together with the wire harness, and the other end is fixed together with the aluminum bar 13 by ultrasonic welding.

[0021] The top of the battery cell 11 is provided with a base plate 1. The base plate 1 is evenly provided with slots 4 for accommodating the electrode post 12 and the aluminum bar 13. Multiple positioning pins 3 are evenly installed on the upper surface of the base plate 1. The lower surface of the base plate 1 is provided with positioning holes 9 that are compatible with the positioning pins 3. The cooperation between the positioning pins 3 and the positioning holes 9 can restrict the position of the cover plate 5 so that it can accurately press the aluminum bar 13.

[0022] A cover plate 5 is provided above the base plate 1. There are multiple cover plates 5. Through holes 7 for laser welding are evenly opened on the cover plates 5. Below the through holes 7 is an aluminum bar 13. The aluminum bar 13 is also provided with a central hole, which is compatible with the central hole on the pole post 12.

[0023] like Figure 1 and Figure 2As shown: Multiple first magnets 2 are embedded in the upper surface of the base plate 1, and multiple second magnets 8 are embedded in the lower surface of the cover plate 5. The positions of the multiple first magnets 2 and the multiple second magnets 8 are corresponding. With the above arrangement, when the cover plate 5 is closed, the first magnets 2 and the second magnets 8 can make the base plate 1 and the cover plate 5 quickly complete the attraction work, thereby restricting the position of the aluminum plate 13.

[0024] like Figure 2 As shown: The lower surface of the cover plate 5 is equipped with multiple protrusions 6 for pressing down the aluminum bar 13; with the above settings, since the aluminum bar 13 is connected to a wire harness and is not easy to place flat, the aluminum bar 13 is pressed down by the protrusions 6 after the cover plate 5 is closed, and the subsequent welding work on the edge is completed.

[0025] Working principle: such as Figure 3 , Figure 4 and Figure 5 As shown, first place the base plate 1 inside the housing 10 containing the battery cell 11, so that the electrode post 12 is located inside the slot 4. Then place the aluminum bar 13 in the slot 4 in sequence. After placing a row of them, cover the corresponding cover plate 5 to prevent the aluminum bar 13 from coming out. After all the cover plates 5 are placed, the laser welding work can be arranged.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser welding fixture for a square lithium battery pack, comprising a housing (10), wherein battery cells (11) are uniformly installed inside the housing (10), wherein each battery cell (11) is provided with a terminal post (12), and an aluminum bar (13) is welded onto the terminal post (12), characterized in that: The top of the cell (11) is provided with a base plate (1), and slots (4) for accommodating the electrode post (12) and aluminum bar (13) are evenly opened on the base plate (1). Multiple positioning pins (3) are evenly installed on the upper surface of the base plate (1). The base plate (1) is provided with a cover plate (5) above it. The cover plate (5) is provided with through holes (7) for laser welding evenly. The lower surface of the base plate (1) is provided with positioning holes (9) that are compatible with positioning pins (3).

2. The laser welding fixture for a square lithium battery pack according to claim 1, characterized in that: Multiple first magnets (2) are embedded in the upper surface of the base plate (1).

3. The laser welding fixture for a square lithium battery pack according to claim 2, characterized in that: A plurality of second magnets (8) are embedded in the lower surface of the cover plate (5), and the positions of the plurality of first magnets (2) and the plurality of second magnets (8) correspond to each other.

4. The laser welding fixture for a square lithium battery pack according to claim 1, characterized in that: The lower surface of the cover plate (5) is provided with a plurality of protrusions (6) for pressing down the aluminum bar (13).

5. The laser welding fixture for a square lithium battery pack according to claim 1, characterized in that: A wire harness (14) is installed between the plurality of said aluminum bars (13).

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