Battery module

Abstract

The utility model provides a battery module. The battery module comprises end plates, side plates, welding beads and battery cells, a pair of end plates are oppositely arranged front and back, a pair of side plates are oppositely arranged left and right, all the end plates and the side plates form welding beads through welding wires, the welding beads are welded together to form a closed space, the welding beads are free of cracks, and a battery cell is arranged in the closed space. According to the utility model, the end plates, the side plates and the welding wires are matched with one another, so that a welding bead has no crack, and the welding strength of the battery module can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery manufacturing, in particular to a battery module. Background Art

[0002] In the manufacturing process of lithium-ion batteries in the modern new energy industry, in order to make the battery cell structure safer and the battery pack structure more solid, more and more battery modules use end plates and side plates in the battery pack design. The connection technology between the end plates and the side plates widely uses laser welding technology. At present, the 5-series aluminum alloy side plates and the 6-series aluminum alloy end plates can be directly welded by laser swing melting to form good quality crack-free welds. However, due to its own characteristics, the complex structure of the 5-series aluminum alloy cannot be directly formed, and its own strength is relatively low. Therefore, the 6-series aluminum alloy side plate becomes the first choice. However, because the 6-series aluminum alloy contains more magnesium-silicon eutectic compounds, thermal cracks will inevitably occur during the laser welding process, which seriously affects the welding strength. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to improve the welding strength of the battery module.

[0004] The utility model solves the above technical problems through the following technical means:

[0005] A battery module comprises an end plate (1), a side plate (2), a weld bead (5), and a battery cell; a pair of the end plates (1) are arranged opposite to each other in the front and rear, and a pair of the side plates (2) are arranged opposite to each other in the left and right; each end plate (1) and each side plate (2) are welded together to form a closed space by means of a welding wire (3) to form a weld bead (5); the weld bead (5) is free of cracks, and a battery cell is arranged in the closed space.

[0006] Beneficial effect: Through the cooperation of the end plate, the side plate and the welding wire, the weld is free of cracks, which can improve the welding strength of the battery module.

[0007] Furthermore, the material of the end plate (1) and the side plate (2) are both 6 series aluminum alloy, and the material of the welding wire (3) is 4 series aluminum alloy or 5 series aluminum alloy or special aluminum alloy.

[0008] Beneficial effect: Through the setting of welding wire material, the 4-series or 5-series welding wire material components are fully integrated into the 6-series end plate material components, which has a quenching and tempering effect on the material components of the welding fusion area, and the formed weld is crack-free.

[0009] Furthermore, two welding wires (3) are provided and are respectively fixed on the end plate (1) and the side plate (2).

[0010] Furthermore, one welding wire (3) is provided and is fixed on the end plate (1) or on the side plate (2) or between the end plate (1) and the side plate (2).

[0011] Furthermore, each of the end plates (1) is provided with a mounting hole (11) near the side plate (2), and a welding wire (3) is arranged in the mounting hole (11).

[0012] Furthermore, the form of the mounting hole (11) includes but is not limited to a hole, a groove, a semicircular groove, and other mounting forms that can fix the welding wire or a welding wire-like wire, and the cross-sectional position of the mounting hole (11) is parallel to the weld bead (5).

[0013] Furthermore, the form of the welding wire (3) includes but is not limited to wire, strip or other forms that are convenient for processing.

[0014] Furthermore, the cross-section of the side panel (2) is set in a lying U-shape, two side panels (2) are provided and are mirror-imaged on the left and right, and the protruding edges of the side panels (2) are arranged facing each other; two end panels (1) are provided and are fixed on the protruding edges of the side panels (2) front and back, and a weld (5) is fixed at the interface between the end panels (1) and the protruding edges of the side panels (2).

[0015] Furthermore, the width of the weld bead (5) is ≥4.5 mm, and the length is 75% to 95% of the height of the side plate (2).

[0016] Furthermore, the combined welding form of the end plate (1) and the side plate (2) can be one of lap welding of the end plate and the side plate, butt welding of the end plate and the side plate, and overlapping welding in which the end plate (1) is placed inside the side plate (2).

[0017] The advantages of the utility model are:

[0018] The utility model makes the weld free of cracks through the mutual cooperation of the end plate, the side plate and the welding wire, thereby improving the welding strength of the battery module.

[0019] The utility model provides a welding wire material so that the 4-series or 5-series welding wire material components are fully integrated into the 6-series end plate material components, which has a quenching and tempering effect on the material components of the welding fusion area, and the formed weld is free of cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial schematic diagram of a battery module according to a first embodiment of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1

[0023] like Figure 1 As shown, this embodiment provides a battery module, including an end plate 1, a side plate 2, a weld 5, and a battery cell (not shown).

[0024] like Figure 1 As shown, a pair of end plates 1 are relatively arranged front and back, and a pair of side plates 2 are relatively arranged left and right. The two end plates 1 and the two side plates 2 are welded together to form a closed space through a welding wire 3 to form a weld 5, and a battery cell is fixed in the closed space; in the prior art, the material of the end plate 1 and the side plate 2 is 6 series aluminum alloy, and the material of the welding wire 3 in this embodiment is 4 series aluminum alloy or 5 series aluminum alloy or special material aluminum alloy, the diameter of the welding wire 3 is 0.5mm-2mm, and the length of the welding wire 3 is consistent with the height of the end plate 1; the welding wire 3 can be fixed on the end plate 1, and can be It can be fixed on the side plate 2, can be fixed between the end plate 1 and the side plate 2, or two can be set to be fixed on the end plate 1 and the side plate 2 respectively. In this embodiment, the welding wire 3 is fixed on the end plate 1; a weld bead 5 is fixed at the interface between the end plate 1 and the side plate 2, the width of the weld bead 5 is ≥4.5mm, and the length is 75% to 95% of the height of the side plate 2. The weld bead 5 is formed after the end plate 1, the side plate 2, and the welding wire 3 are melted and solidified; the combined welding form of the end plate 1 and the side plate 2 can be one of the end-side plate lap welding, end-side plate butt welding, and the end plate 1 is placed on the inner side of the side plate 2 and overlapped.

[0025] like Figure 1 As shown, the cross-section of the side panel 2 is a lying U-shape, two side panels 2 are provided and are mirrored on the left and right, and the protruding edges of the side panels 2 are arranged facing each other; two end panels 1 are provided and are fixed on the protruding edges of the side panels 2 front and back, and each end panel 1 is provided with a mounting hole 11 near the protruding edge of the side panel 2, and the diameter of the mounting hole 11 is adapted to the diameter of the welding wire 3 and is used to install the welding wire 3, and the cross-sectional position of the mounting hole 11 is parallel to the weld bead 5; the form of the mounting hole 11 includes but is not limited to holes, grooves, semicircular grooves, etc. and other installation forms that can fix welding wires or welding wire-like installation forms; the form of the welding wire 3 includes but is not limited to wire, strip or other forms that are convenient for processing.

[0026] When in use, the welding wire 3 is placed in the mounting hole 11 of the end plate 1, and heated until the end side plate and the welding wire 3 are melted. The material components of the 4-series or 5-series welding wire 3 are fully integrated into the material components of the 6-series end side plate, which has a tempering effect on the material components of the welding fusion area. The formed weld 5 is free of cracks, thereby improving the welding strength of the end plate 1 and the side plate 2.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery module, characterized in that: It comprises an end plate (1), a side plate (2), a welding bead (5), and a battery core; A pair of end plates (1) are arranged opposite to each other in the front and rear, and a pair of side plates (2) are arranged opposite to each other in the left and right. The end plates (1) and the side plates (2) are welded together to form a closed space by welding wires (3) to form a weld bead (5). The weld bead (5) is free of cracks, and a battery cell is arranged in the closed space.

2. A battery module according to claim 1, characterized in that: The material of the end plate (1) and the side plate (2) are both 6 series aluminum alloy, and the material of the welding wire (3) is 4 series aluminum alloy or 5 series aluminum alloy.

3. A battery module according to claim 1, characterized in that: The welding wires (3) are provided with two pieces which are respectively fixed on the end plate (1) and the side plate (2).

4. A battery module according to claim 1, characterized in that: The welding wire (3) is provided with one wire, which is fixed on the end plate (1) or on the side plate (2) or between the end plate (1) and the side plate (2).

5. A battery module according to claim 4, characterized in that: Each of the end plates (1) is provided with a mounting hole (11) near the side plate (2), and a welding wire (3) is arranged in the mounting hole (11).

6. A battery module according to claim 5, characterized in that: The mounting hole (11) is in the form of a hole, a groove, or a semicircular groove, and the cross-sectional positions of the mounting hole (11) and the weld bead (5) are parallel.

7. A battery module according to claim 1, characterized in that: The welding wire (3) is in the form of a wire or a strip.

8. A battery module according to claim 1, characterized in that: The cross section of the side panel (2) is arranged in a lying U shape, two side panels (2) are arranged and are mirror-imaged on the left and right, and the protruding edges of the side panels (2) are arranged facing each other; two end panels (1) are arranged and are fixed on the protruding edges of the side panels (2) front and back, and a weld (5) is fixed on the interface between the end panels (1) and the protruding edges of the side panels (2).

9. A battery module according to claim 1, characterized in that: The width of the weld bead (5) is ≥4.5 mm, and the length is 75% to 95% of the height of the side plate (2).

10. A battery module according to claim 1, characterized in that: The combined welding form of the end plate (1) and the side plate (2) can be one of end-side plate lap welding, end-side plate butt welding, and overlapping welding in which the end plate (1) is placed inside the side plate (2).

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