High-stability battery pack steel belt hoop and welding processing method thereof

Abstract

The invention relates to the technical field of battery pack steel belt welding processing, in particular to a high-stability battery pack steel belt hoop and a welding processing method thereof. After a steel belt is bent into a U shape, a heat shrink tube is connected in a sleeved mode, then the side edge of the steel belt is bent inwards to form a bent edge, then the bent edge is bent by 90 degrees to form a groove for connecting a cuboid metal block, three faces of the metal block and the bent section are welded in a three-face mode, the structure is stable, the cuboid metal block is connected in a threaded mode through two screws, and then end welding is conducted. During assembly or disassembly, fastening connection and disassembly can be achieved by adjusting the tightness of the hoop, use is convenient, in the assembly state, when the steel belt hoop is subjected to outward acting force of a battery pack, due to the fact that three faces of the bent section of the steel belt wrap the cuboid metal block, and three faces of the bent section of the steel belt are welded, the steel belt hoop can be firmly connected and disassembled. The welding part is prevented from being unwelded due to shearing acting force, and the stability of the steel belt hoop is greatly improved.

Description

[0001] This case is a divisional application of the parent case with patent application number 202411574411.1, application date 20241106, and titled “Welding Processing Method for Battery Pack Steel Strip Clamp”. Technical Field

[0002] The present invention relates to the technical field of battery pack steel strip welding processing, and in particular to a high-stability battery pack steel strip clamp and a welding processing method thereof. Background Art

[0003] The power battery system consists of a single or multiple battery packs. Generally speaking, each battery pack consists of several battery modules, and the battery module consists of several battery cells. For square shell battery packs, steel belts are usually used to fix the battery packs, and the battery cells in each module are bundled together with steel belts.

[0004] The existing steel strips used for bundling battery modules have a snap-fit ​​structure at the end positions of the steel strips at the end joints, which is not strong enough and stable enough, and is easy to loosen permanently; the Chinese patent with the authorization announcement number CN217788675U discloses a fixing and tightening structure and a battery module, the above-mentioned fixing and tightening structure includes a steel strip, a heat shrink tube and a welding part, the steel strip includes a main body, an inward welding end and an outward welding end, and the inward welding end and the outward welding end are mutually fitted; the heat shrink tube is coated on the steel strip; the welding part includes an inward welding part and an outward welding part, the inward welding part includes a first main welding area and two first end welding areas, and the first end welding area includes at least two first end welding points; the outward welding part includes a second main welding area and two second end welding areas, and the second end welding area includes at least two second end welding points; the first main welding area is fitted and welded with the second main welding area, and the first end welding point is welded with the second end welding point in a one-to-one correspondence. A plurality of discontinuous welding points are arranged at the joints of the steel strips, so that the fixing and tightening structure has a higher firmness;

[0005] However, the steel belt structure involved in the above patent is a fixed rectangular frame structure, which is difficult to operate when it is installed with the battery pack, and the two ends of the steel belt are fitted with each other, and then through multi-point welding, when the steel belt is connected to the battery pack, the steel belt is mainly subjected to the force in the width direction and length direction of the battery pack. Since the welding direction of the welding point of the steel belt is a single direction, that is, the length direction of the battery pack, when the steel belt is subjected to the force in the width direction of the battery pack, the welding point position of the steel belt is subjected to shear force. After the battery pack is used for a long time or is subjected to severe impact, there is a risk of desoldering, which makes it difficult to obtain a stable fixation of the battery pack. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a battery pack steel band clamp and a welding processing method thereof, which has the advantages of simple processing technology, making the manufactured battery pack steel band convenient to assemble and disassemble and good stability.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] The welding processing method of the battery pack steel band clamp comprises the following steps:

[0009] Step 1: bend a straight steel strip into two sections at 90 degrees to form a U-shape, wherein the U-shape includes a bottom side and two sides vertically connected to the bottom side; prepare a rectangular metal block, wherein a threaded hole is specially provided in the middle of the rectangular metal block;

[0010] Step 2: Sleeve the heat shrink tube on both sides of the U-shape. The length of the heat shrink tube is shorter than the length of the side, so that the end of the side leaks out of the heat shrink tube;

[0011] Step 3: Bend the two sides of the U-shaped part that leak out of the heat shrink tube in opposite directions by 90 degrees to form a bent edge;

[0012] Step 4: Bend the ends of the two bent edges outwards 90 degrees twice respectively, so that the first-level bending sections of the two bent edges are located in the same plane, and the second-level bending sections are parallel to each other, and the lengths of the first-level bending sections and the second-level bending sections are respectively the same as the lengths of the two adjacent sides of the rectangular metal block;

[0013] Step 5: Drill first through holes at the second-stage bending sections of the two bending edges respectively, so that the axes of the two first through holes coincide with each other;

[0014] Step 6: The three continuous planes of the rectangular metal block are matched with the grooves formed by the first bending section and the second bending section of the bending edge and welded respectively, so that the threaded hole of the rectangular metal block coincides with the axis of the first through hole, and the thread directions of the threaded holes of the rectangular metal block connected by the two bending sections are opposite;

[0015] Step 7: Thread the two mirror-image screws into the threaded holes of the rectangular metal block respectively, and adjust the two screws and the corresponding threaded holes to the same threaded connection depth; contact the ends of the two screws coaxially and weld them to each other to form a double-headed screw to obtain a battery pack steel band clamp.

[0016] Furthermore, in the welding processing method of the battery pack steel band clamp, in step 1, the width of the rectangular metal block is equal to the width of the linear steel band.

[0017] Furthermore, in the welding processing method of the above-mentioned battery pack steel strip clamp, in step 6, the welding is specifically brazing, which is specifically: pre-coating the brazing material on three continuous planes of the rectangular metal block, inserting the metal block into the groove formed by the first-level bending section and the second-level bending section of the bent edge, heating the metal block and the connection between it and the steel strip until the brazing material melts, and then cooling and solidifying to complete the welding.

[0018] Furthermore, in the welding processing method of the battery pack steel band clamp, in step 7, the welding is specifically brazing, which is specifically: applying the brazing material to the connecting ends of the two screws in advance, contacting the ends of the two screws coaxially, positioning them, heating the contact parts until the brazing material melts, and then cooling and solidifying to complete the welding.

[0019] Furthermore, in the welding processing method of the battery pack steel strip clamp, the brazing filler metal for brazing the rectangular metal block and the steel strip is selected from copper-based brazing filler metal, aluminum-based brazing filler metal, nickel-based brazing filler metal or silver-based brazing filler metal.

[0020] Furthermore, in the welding processing method of the battery pack steel band clamp, the brazing filler metal between the two screws is selected from copper-based brazing filler metal, aluminum-based brazing filler metal, nickel-based brazing filler metal or silver-based brazing filler metal.

[0021] Furthermore, in the welding processing method of the battery pack steel band clamp, one end of the screw rod facing away from the other screw rod is connected to a hexagonal head.

[0022] Furthermore, in the welding processing method of the battery pack steel band clamp, the end of the hexagonal head is provided with a hexagonal groove.

[0023] The present invention also protects a battery pack steel band clamp manufactured by the welding processing method of the battery pack steel band clamp.

[0024] The beneficial effects of the present invention are as follows: after the steel strip is bent into a U shape, a heat shrink tube is first sleeved, and then the side of the steel strip is bent inward to form a bent edge, and then the bent edge is bent at 90 degrees in two sections to serve as a groove for connecting the rectangular metal block, and the three sides of the metal block are welded to the three sides of the bent section, so that the structure is stable, and the rectangular metal block is threadedly connected by two screws and then the ends are welded to form a double-headed screw. This structure is easy to process, and secondly, the distance between the two rectangular metal blocks can be quickly adjusted by rotating the screw, thereby achieving the purpose of adjusting the tightness of the steel strip clamp. When assembling or disassembling, the tightness of the clamp can be adjusted to achieve fastening connection and disassembly, which is easy to use. Compared with the traditional structure of spot welding at both ends, it is more conducive to installation and disassembly. In the assembled state, when the steel belt clamp is subjected to the outward force of the battery pack, the bent section of the steel belt wraps the rectangular metal block on three sides and is welded on three sides, which avoids the welding part from being desoldered due to the shear force. Due to the reinforcement of the rectangular metal block, the force applied by the battery pack is borne by the rectangular metal block, which greatly improves the stability of the steel belt clamp and is not prone to desoldering. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a U-shaped steel strip obtained in step 1 of a battery pack steel strip clamp welding processing method according to a specific embodiment of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a U-shaped steel strip after being sleeved with a heat shrink tube in step 2 of a battery pack steel strip clamp welding processing method according to a specific embodiment of the present invention;

[0027] Figure 3 for Figure 2 A magnified view of part A;

[0028] Figure 4 This is a schematic diagram of the structure of a battery pack steel strip clamp welding method in a specific embodiment of the present invention, in which a U-shaped steel strip forms a bending edge in step 3 to step 4, and the bending edge is bent twice at 9 degrees;

[0029] Figure 5 It is a structural schematic diagram of drilling first through holes at the second-level bending sections of two bending edges in step 5 of a battery pack steel band clamp welding processing method according to a specific embodiment of the present invention;

[0030] Figure 6 for Figure 5 A magnified view of part B;

[0031] Figure 7It is a structural schematic diagram of the step 6 of a battery pack steel band clamp welding processing method according to a specific embodiment of the present invention, in which three continuous planes of the rectangular metal block are respectively matched with the grooves formed by the first-level bending section and the second-level bending section of the bending edge and welded;

[0032] Figure 8 for Figure 7 Enlarged view of part C;

[0033] Fig. 9 It is a structural schematic diagram of two screws before being connected in step 7 of a battery pack steel band clamp welding processing method according to a specific embodiment of the present invention;

[0034] Fig.10 for Fig. 9 A magnified view of the D portion;

[0035] Fig.11 A schematic structural diagram of a battery pack steel band clamp manufactured by a battery pack steel band clamp welding processing method according to a specific embodiment of the present invention from a first perspective;

[0036] Fig.12 for Fig.11 A magnified view of part E;

[0037] Fig.13 A schematic structural diagram of a battery pack steel band clamp from a second perspective, which is obtained by a battery pack steel band clamp welding processing method according to a specific embodiment of the present invention;

[0038] Fig.14 for Fig.13 Magnified view of part F;

[0039] Description of labels:

[0040] 1. Bottom edge;

[0041] 2. side edge; 21. bent edge; 211. first level bent section; 212. second level bent section; 213. first through hole;

[0042] 3. Heat shrink tubing;

[0043] 4. rectangular metal block; 41. threaded hole;

[0044] 5. screw; 51. hexagonal head; 52. hexagonal groove;

[0045] 6. Solder. DETAILED DESCRIPTION

[0046] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0047] Please refer to Figures 1 to 14The specific embodiment of the present invention relates to a welding processing method for a battery pack steel band clamp, comprising the following steps:

[0048] Step 1: bend a straight steel strip into two sections at 90 degrees to form a U-shape, wherein the U-shape includes a bottom side 1 and two side sides 2 vertically connected to the bottom side 1; prepare a rectangular metal block 4, wherein the rectangular metal block 4 has a threaded hole 41 in the middle of the rectangular metal block 4;

[0049] Step 2: Sleeve the heat shrink tube 3 on both sides 2 of the U-shape, the length of the heat shrink tube 3 is shorter than the length of the side 2, so that the end of the side 2 leaks out of the heat shrink tube 3;

[0050] Step 3: Bend the two side edges 2 of the U-shape that are exposed from the heat shrink tube 3 by 90 degrees in opposite directions to form bent edges 21;

[0051] Step 4: Bend the ends of the two bending edges 21 outwards 90 degrees twice, respectively, so that the first-level bending sections of the two bending edges are located in the same plane, and the second-level bending sections are parallel to each other, and the lengths of the first-level bending section 211 and the second-level bending section 212 are respectively the same as the lengths of the two adjacent sides of the rectangular metal block 4;

[0052] Step 5: Drill first through holes 213 at the second-stage bending sections of the two bending edges respectively, so that the axes of the two first through holes 213 coincide with each other;

[0053] Step 6: The three continuous planes of the rectangular metal block 4 are respectively matched with the grooves formed by the first-stage bending section and the second-stage bending section of the bending edge 21 and welded, so that the threaded hole 41 of the rectangular metal block 4 coincides with the axis of the first through hole 213, and the thread directions of the threaded holes 41 of the rectangular metal block 4 connected by the two bending sections are opposite;

[0054] Step 7: respectively thread the two mirror-image screws 5 into the threaded holes 41 of the rectangular metal block 4, and adjust the two screws 5 and the corresponding threaded holes 41 to the same threaded connection depth; coaxially contact the ends of the two screws 5 and weld them to each other to form a double-headed screw 5, and obtain a battery pack steel band clamp.

[0055] In the above implementation manner, after the steel strip is bent into a U shape, the heat shrink tube 3 is first sleeved, and then the side edge 2 of the steel strip is bent inward to form a bent edge 21, and then the bent edge 21 is bent at 90 degrees in two sections to serve as a groove for connecting the rectangular metal block 4. The three sides of the metal block are welded to the three sides of the bent section, and the structure is stable. The rectangular metal block 4 is threadedly connected with two screws 5 and then the ends are welded to form a double-headed screw 5. This structure is easy to process, and secondly, the two rectangular metal blocks can be quickly adjusted by rotating the screw 5. The spacing between the metal blocks 4 is reduced, so as to achieve the purpose of adjusting the tightness of the steel belt clamp. When assembling or disassembling, the tightness of the clamp can be adjusted to achieve fastening and disassembly, which is easy to use. Compared with the traditional structure of spot welding at both ends, it is more conducive to installation and disassembly. In the assembled state, when the steel belt clamp is subjected to the outward force of the battery pack, the bent section of the steel belt wraps the rectangular metal block 4 on three sides and is welded on three sides, which avoids the welding part from being desoldered due to the shear force, thereby greatly improving the stability of the steel belt clamp.

[0056] As a preferred embodiment, in step 1, the width of the rectangular metal block 4 is equal to the width of the linear steel strip.

[0057] As a preferred embodiment, in step 6, the welding is specifically brazing, which is specifically as follows: the brazing material 6 is pre-applied to three continuous planes of the rectangular metal block 4, the metal block is inserted into the groove formed by the first-level bending section and the second-level bending section of the bending edge 21, the metal block and the connection between it and the steel strip are heated until the brazing material 6 melts, and then cooled and solidified to complete the welding.

[0058] As a preferred embodiment, in step 7, the welding is specifically brazing, which is specifically as follows: the brazing material 6 is pre-applied to the connecting ends of the two screws 5, the ends of the two screws 5 are coaxially contacted, positioned, and the contact parts are heated until the brazing material 6 melts, and then cooled and solidified to complete the welding.

[0059] In the above embodiment, during the brazing process, the base material does not need to be melted, only the brazing material 6 is melted, which has little effect on the structure and performance of the base material, thereby easily ensuring the structural accuracy and stability of the steel band clamp and the screw 5, and no deformation will occur during the welding process. The brazing method facilitates multi-sided and efficient welding between the rectangular metal block 4 and the steel band, and the brazed joint is flat and smooth, which further ensures the structural accuracy of the product.

[0060] As a preferred embodiment, the brazing filler metal 6 for brazing the rectangular metal block 4 and the steel strip is selected from copper-based brazing filler metal 6, aluminum-based brazing filler metal 6, nickel-based brazing filler metal 6 or silver-based brazing filler metal 6.

[0061] As a preferred embodiment, the solder 6 for brazing between the two screws 5 is selected from a copper-based solder 6 , an aluminum-based solder 6 , a nickel-based solder 6 or a silver-based solder 6 .

[0062] As a preferred embodiment, one end of the screw rod 5 away from the other screw rod 5 is connected with a hexagonal head 51. It is convenient to adjust the screw rod 5 with a hexagonal wrench to achieve the purpose of tightening and loosening the steel band clamp.

[0063] As a preferred embodiment, a hexagonal groove 52 is provided at the end of the hexagonal head 51, and the screw 5 can be rotated with the help of a hexagonal screwdriver to achieve the purpose of tightening or loosening the clamp.

[0064] The present invention also protects a battery pack steel band clamp manufactured by the welding processing method of the battery pack steel band clamp.

[0065] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A welding method for a high-stability battery pack steel band clamp, characterized in that: The following steps are involved: Step 1: bend the straight steel strip 90 degrees twice to form a U-shape, wherein the U-shape includes a bottom side and two sides vertically connected to the bottom side; prepare a rectangular metal block, and set a threaded hole in the middle of the rectangular metal block; Step 2: Sleeve the heat shrink tube on both sides of the U-shape. The length of the heat shrink tube is shorter than the length of the side, so that the end of the side is exposed to the heat shrink tube; Step 3: Bend the exposed heat shrink tube on both sides of the U-shape 90 degrees in opposite directions to form bent edges; Step 4: Bend the ends of the two bending edges outwards twice at 90 degrees respectively, so that the first bending sections of the two bending edges are located in the same plane, and the second bending sections are parallel to each other, and the lengths of the first bending section and the second bending section are respectively the same as the lengths of the two adjacent sides of the rectangular metal block; Step 5: Drill first through holes at the second-stage bending sections of the two bending edges respectively, so that the axes of the two first through holes coincide with each other; Step 6: The three continuous planes of the rectangular metal block are matched and welded with the grooves formed by the first bending section and the second bending section of the bending edge, respectively, so that the threaded hole of the rectangular metal block coincides with the axis of the first through hole, and the thread directions of the threaded holes of the rectangular metal block connected by the two bending sections are opposite; Step 7: thread the two mirror-image screws into the threaded holes of the rectangular metal block respectively, and adjust the two screws and the corresponding threaded holes to the same thread connection depth; coaxially contact the ends of the two screws and weld them to each other to form a double-headed screw, and obtain a battery pack steel band clamp; The brazing filler metal for brazing the rectangular metal block and the steel strip is selected from aluminum-based brazing filler metal, and the brazing filler metal for brazing the two screws is selected from copper-based brazing filler metal.

2. The welding processing method of the high-stability battery pack steel band clamp according to claim 1 is characterized in that: In step 1, the width of the rectangular metal block is equal to the width of the linear steel strip.

3. The welding processing method of the high-stability battery pack steel band clamp according to claim 1 is characterized in that: One end of the screw rod facing away from the other screw rod is connected with a hexagonal head.

4. The welding processing method of the high-stability battery pack steel band clamp according to claim 3 is characterized in that: The end of the hexagonal head is provided with a hexagonal groove.

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