TWI766585B - A bonding method of an electrical connection point, and battery module including a bonding structure of an electrical connection point - Google Patents

Abstract

A bonding structure of an electrical connection point in a battery module includes a conductive portion and an electrode sheet, and the electrode sheet is welded to the conductive portion. The electrode sheet is made of a first metal material, and the conductive portion is made of a second metal material. A welding track is formed at the interface between the electrode sheet and the conductive portion, and the welding track is formed by mixing the first metal material and the second metal material. The welding tracks do not substantially overlap. Moreover, the welding track includes a moving path; and a lateral path of shaking or oscillating movement on the side of the moving path.

Description

Bonding method of electrical connection point and electrical connection structure including an electrical connection point pool module

The present invention relates to a bonding structure of an electrical connection point, a bonding method of the electrical connection point, and a battery module including the bonding structure of the electrical connection point. In particular, it relates to a joint structure with two electrical connection points of different materials, and the joint structure has a continuous welding track.

According to the prior art, such as Taiwan Patent No. M285125, a battery module is proposed, in which several metal conductors of different materials are arranged between battery cells or between circuit substrates, and are welded by resistance. Resistance welding or soldering welding is used to connect several battery cells in parallel or in series to form a conductive battery device.

Resistance welding: When welding dissimilar materials, it must be welded in a penetrating way, but its defect rate is high, such as the formation of sticky needles, empty welding and spot explosion, etc., and the welding speed is slow and the production method material selection is limited. For example, when the welding arrangement of materials with different melting points, there will be failure to weld pick up problem. Soldering welding: each welding point needs to use tin wire as the welding material, which consumes tin resources and human resources, and increases environmental pollution; it is also easy to be slow due to the slow soldering operation, when the production conditions are uncertain, welding methods and skills. The immaturity makes it impossible to completely solve and avoid artificial solder quality problems (such as cold soldering, missing soldering, tin beads, tin slag, tin balls, etc.). However, when the battery pack is disconnected due to the above problem, the battery module carried by the user cannot be used. If the battery pack is short-circuited, the safety of the battery module will be greatly reduced.

In addition, a joining method is a single-point laser welding method, which is proposed by, for example, Chinese Patent Publication No. CN108140494A. Single spot laser welding: Using non-contact laser welding technology, the energy is concentrated on the metal surface, and the two dissimilar metals can be welded through a single point laser. However, due to the difference in the characteristics of the two metal materials to be welded, abnormal welding will be caused (such as weak welding, too deep welding, resulting in breakdown of metal guides, etc.). If the battery pack is short-circuited, the safety of the battery module will be greatly reduced.

According to an embodiment of the present invention, an object of the present invention is to provide a bonding structure for electrical connection points, which can reduce excessive soldering phenomenon in the bonding structure, and a method for manufacturing the foregoing bonding structure for electrical connection points. Another embodiment aims to provide a battery module, which includes a bonding structure of electrical connection points as a bonding structure between a battery device and a circuit carrier, which can reduce excessive soldering. Another embodiment aims to provide a bonding structure for electrical connection points with better stability; a method for manufacturing the aforementioned bonding structure for electrical connection points; and a battery module including the aforementioned bonding structure for electrical connection points.

According to an embodiment of the present invention, a bonding structure of an electrical connection point is provided, which includes a conductive portion and an electrode sheet, and the electrode sheet is welded to the conductive portion. The electrode piece is made of a first metal material, and the conductive portion is made of a second metal material. A welding track is formed at the interface between the electrode sheet and the conductive portion, and the welding track is formed by mixing the first metal material and the second metal material. The welding trajectories do not substantially overlap. Furthermore, the welding track includes a moving path; and a lateral path that performs a wobbly movement or an oscillating movement in the lateral direction of the moving path. Furthermore, the welding track has two or more welding regions in one cross-section.

In an embodiment, preferably, the graphics of the moving path are UU-shaped, U-shaped, V-shaped, III-shaped, IIII-shaped, M-shaped, W-shaped, VV-shaped, S-shaped or font II.

In one embodiment, the track length of the welding track is greater than 0.5 mm, and the width dimension of the welding regions on the cross section is greater than 0.3 mm.

In one embodiment, the tensile strength of the welded portion generated by the welding track is greater than 1 Kgf.

In one embodiment, the welding track utilizes a high-energy ray to irradiate the interface between the electrode sheet and the conductive portion, so that the first metal material and the second metal material are mixed. In one embodiment, the circuit carrier is a printed circuit assembly board, and the conductive portion includes a solder layer and a copper foil.

According to an embodiment of the present invention, there is provided a battery module including: the aforementioned joint structure for electrical connection points, at least one battery device and a circuit carrier. At least one battery device includes a bonding junction of the electrical connection point The joint structure includes an electrode sheet, and the electrode sheet extends from the body of the at least one battery device. The circuit carrier includes a bonding structure of the electrical connection point, the bonding structure including a conductive portion. The normal direction of the cross section is not perpendicular to the extending direction of the electrode sheet extending from the at least one battery device. In one embodiment, preferably, the normal direction of the cross section is parallel to the extending direction of the electrode sheet extending from the at least one battery device.

In one embodiment, the extending direction of the electrode sheet extending from the at least one battery device is the length direction of the pattern of the moving path.

According to an embodiment of the present invention, there is provided a manufacturing method of a bonding structure of an electrical connection point for manufacturing the aforementioned bonding structure of an electrical connection point. The manufacturing method includes the following steps. A high-energy ray is used to irradiate the interface between the electrode sheet and the conductive portion, so that the first metal material and the second metal material are mixed. The high energy wire is moved along the movement path. And, the high-energy wire is caused to shake or oscillate in the lateral direction of the moving path to form the lateral path, thereby forming the welding track.

In one embodiment, the step of using a high-energy ray generated by a high-energy ray generating device includes the following steps. The energy range for controlling the output of the high-energy wire generating device is a power of 70-100 W; and the welding speed for moving the high-energy wire on the moving path is 70-90 mm/sec.

To sum up, the bonding structure of the electrical connection point according to an embodiment of the present invention has a welding track, and the welding track is formed by mixing the first metal material and the second metal material, the welding track does not substantially overlap, and The welding track has more than 2 welding areas on a cross section, which can reduce the damage to the circuit The lowest part of the carrier, and to improve the welding strength between the first metal material and the second metal material. In one embodiment, the bonding structure of the electrical connection point can be used in the battery module as the bonding structure between the battery device and the circuit carrier.

111-114: Welding area

200: battery module

210: Shell

211: Top cover

212: Frame

213: Bottom cover

214: accommodating space

220: Battery unit

221: positive electrode

222: negative electrode

230: Circuit Carrier

300: Joint structure

301: Carrier

302: Medium

303: Substrate

304: Substrate

A: Laser center point

B: Laser center point

D: Tensile test direction

Lf: welding track

Lv: movement path

Sa: cross section

Wo: Lateral Path

FIG. 1 shows an exploded view of a battery module according to an embodiment of the present invention.

FIG. 2 is a plan view showing a partial structure of the interior of the battery module of the embodiment of FIG. 1 .

FIG. 3 shows a top view of a joint structure according to various embodiments of the present invention.

FIG. 4 shows the dimensions of each part of the joint structure of the embodiments (a), (d) and (c) of FIG. 3 .

FIG. 5A shows an enlarged schematic view of the pattern of the welding track in the embodiment of FIG. 3( a ).

FIG. 5B shows an enlarged schematic view of the pattern of the welding track according to an embodiment of the present invention.

FIG. 6 shows a cross-sectional view of a metal bonding structure according to an embodiment of the present invention.

7A shows a top view of an M-shaped weld trace with lateral rocking movement.

Figure 7B shows a top view of the weld trace of a 6 helical spot weld.

7C shows a top view of another embodiment of an M-shaped welding track with lateral rocking movement.

FIG. 8A shows a top view of an M-shaped welding pattern with partial overlap.

FIG. 8B shows a cross-sectional view of the overlapping portion of FIG. 8A .

FIG. 1 shows an exploded view of a battery module according to an embodiment of the present invention. FIG. 2 is a plan view showing a partial structure of the interior of the battery module of the embodiment of FIG. 1 . As shown in FIGS. 1 and 2 , according to an embodiment of the present invention, the battery module 200 includes a casing 210 , a joint structure 300 , at least one battery device 220 and a circuit carrier 230 . The battery device 220 includes at least one battery cell. In one embodiment, the at least one battery cell may also be a plurality, and the battery device 220 is a series and parallel connection of the battery cells. The housing 210 defines an accommodating space 214 for accommodating the battery device 220 and the circuit carrier 230 . As shown in FIG. 2 , the battery device 220 is connected to the circuit carrier 230 through the bonding structure 300 . The casing 210 includes a top cover 211 , a bottom cover 213 and a frame 212 . The frame 212 is located between the top cover 211 and the bottom cover 213 and defines the accommodating space 214 .

FIG. 2 is a plan view showing a partial structure of the interior of the battery module of the embodiment of FIG. 1 . As shown in FIG. 2 , each battery device 220 includes a negative electrode sheet 222 and a positive electrode sheet 221 extending from the body of the battery device 220 in a spaced manner from each other. The negative electrode sheet 222 and the positive electrode sheet 221 are welded to the plurality of conductive parts 231 of the circuit carrier 230 , and between the negative electrode sheet 222 and one conductive part 231 of the circuit carrier 230 and between the positive electrode sheet 221 and the other conductive part 231 of the circuit carrier 230 Between them, a joint structure 300 is respectively formed, so as to electrically connect the battery devices 220 on the left and right sides, and output the power of the battery devices 220 to the outside through the circuit carrier 230 .

According to the present invention, the metal materials of the negative electrode sheet 222 and the positive electrode sheet 221 may be the same or different. In one embodiment, when the battery device 220 is a lithium ion capacitor or a lithium ion secondary battery, and the negative electrode sheet 222 and the positive electrode sheet 221 are made of the same metal material, one of them will dissolve due to electrochemical action. Therefore, it is preferable to The negative electrode tab 222 and the positive electrode tab 221 include metal materials different from each other. More specifically, in this embodiment, the positive electrode sheet 221 contains aluminum, and the negative electrode sheet 222 contains copper. The circuit carrier 230 may be a circuit board, a metal plate, and an acrylic plate containing circuits. The circuit board can be a PCB board or a BMS control board.

In the joint structure 300 of the negative electrode sheet 222 and the conductive portion 231 of the circuit carrier 230 , the negative electrode sheet 222 is a first metal material, and the conductive portion 231 of the circuit carrier 230 is a second metal material. A welding track Lf (as described later) is formed at the interface between the negative electrode sheet 222 and the conductive portion 231 of the circuit carrier 230 , and the welding track Lf is formed by mixing the first metal material and the second metal material. According to an embodiment of the present invention, a bonding structure 300 is provided, which includes a first metal material and a second metal material, and a welding track Lf is formed at the interface of the first metal material and the second metal material. The first metal material and the second metal material may be the same material or different materials. Preferably, the material of the bonding structure 300 can be a combination of pure metal sheets (such as copper-nickel, nickel-copper, copper-copper, nickel-nickel, etc.), or a compound alloy (such as copper-nickel plating, iron-nickel plating or copper-nickel plating). Welding between metal alloy sheets such as alloys) and nickel, silver-plated, gold-plated or silver and gold metal sheets.

In one embodiment, the bonding structure 300 is welded by a high-energy beam generated by a high-energy beam generator (not shown), preferably by laser welding. In one embodiment, the high-energy line may be the irradiating light of an optical fiber laser. In the design of high-power laser welding, the most important thing is to use high-power lasers to continuously weld in different welding methods. Using the strength of the laser energy, the moving speed, and the difference in the dimensions and material types of the objects to be welded, together with the use of precise tools, the two independent metal sheets can be welded together at the interface, which can be used in the battery device 220. series or parallel. In one embodiment, the object to be welded can be a combination of two independent metal sheets (such as copper-nickel, nickel-copper, copper-copper, nickel-nickel, etc.), or a compound alloy (such as copper-nickel-plated, iron-nickel-plated or copper-plated) Welding between metal alloy sheets such as nickel alloys) and metal sheets such as nickel, silver-plated, gold-plated or silver and gold. Preferably, the bonding structure 300 is used for the connection between the battery device 220 and the circuit substrate.

As shown in FIG. 2 , in one embodiment, the bonding structure 300 can be a bonding structure of electrical connection points, which can be used in a battery module 200 , wherein the bonding structure 300 includes a conductive portion and an electrode sheet. In this embodiment, the conductive portion of the bonding structure 300 may be a conductive portion 231 of the circuit carrier 230 . However, the present invention is not limited thereto, and in other embodiments, the conductive portion of the bonding structure 300 may also be a conductive sheet, a bus bar, a conductive frame, a metal sheet, or the like. In this embodiment, the electrode sheet of the bonding structure 300 may be the positive electrode sheet 221 of the battery device 220 or the negative electrode sheet 222 .

FIG. 3 shows a top view of a bonding structure 300 according to various embodiments of the present invention. FIG. 4 shows the dimensions of each part of the bonding structure 300 of the embodiments (a), (d) and (c) of FIG. 3 . FIG. 5A shows an enlarged schematic view of the pattern of the welding track of the embodiment (a) of FIG. 3 . FIG. 5B shows an enlarged schematic view of the pattern of the welding track according to an embodiment of the present invention. FIG. 3 shows graphs of welding trajectories Lf of various embodiments (a) to (f). As shown in FIGS. 3(a)-(f), 5A and 5B, the welding tracks Lf do not substantially overlap, and the welding track Lf includes a movement path Lv; and shakes in the lateral direction of the movement path Lv ( wobble) moving or oscillating movement of a lateral path Wo. The graphics of the moving path Lv of the welding track Lf are UU-shaped, U-shaped, V-shaped, III-shaped, IIII-shaped (can be M-shaped, VV-shaped or W-shaped), S-shaped and Type II. The laser trajectory in FIG. 3(d) is composed of four straight lines and is composed of a plurality of forward and reverse V, M or W-shaped paths, and the welding trajectory Lf of these four straight lines is substantially different. overlapping.

As shown in FIG. 4 , the line width of the pattern in the embodiment (d) of FIG. 4 is 0.5±0.1 mm. According to the present invention, within the space of the welding effective area of 6mm*4mm in the various embodiments (a)~(f) of FIG. 3, the size of the welding area is about 3mm*2mm (fine-tuning the size according to the needs), and the trajectory of the laser welding is Characteristics of type and track length The characteristics include: the laser continuous welding trajectories are substantially non-overlapping. In one embodiment, preferably, the laser continuous welding track must be independent and single. In one embodiment, the welding effective area may be an electrode sheet of 7.8 mm*4 mm; or the area of the conductive portion, and the welding area of 3 mm*2 mm is any one of the welding effective areas. In another embodiment, the welding effective area may be the overlap of the electrode sheet and the conductive portion, and the welding area of 3 mm*2 mm is any one of the welding effective areas.

As shown in FIG. 5A and FIG. 5B , in one embodiment, the welding track Lf may be a laser continuous welding track. As shown in FIG. 5B , when the laser ray does not move, the welding area Sb caused by the laser beam is approximately circular, and the width dimension of the welding area Sb is wb. More specifically, the laser beam has a substantially circular shape, and when it is irradiated on the surface of the metal material, it is thermally diffused to form the welding region Sb. When the laser line moves, for example, when moving from the laser center point A to the laser center point B, the welding track Lf forms a continuous line. In the present invention, preferably, the welding track Lf formed by the laser center point is not. overlap, while the thermal diffusion regions of the laser rays at different time points overlap. In one embodiment, preferably, the length of the welding track Lf is greater than the width wb of the welding region Sb. For example, the distance Lab of the track length of the welding track Lf between the laser center point A and the laser center point B is greater than the width wb of the welding region Sb. When the length of the welding track Lf is less than the width wb of the welding area Sb, the laser beam does not move substantially, but a single point is formed, so that the welding part with a tensile strength greater than 1Kgf cannot be formed. In one embodiment, the width wb of the welding region Sb is greater than or equal to 0.3 mm.

In one embodiment, preferably, the track length of the welding track Lf is greater than (>) 0.5 mm. In one embodiment, preferably, most (best is all) of the cross-section Sa of the welding track Lf in the tensile test direction D (as shown in FIG. 2 and FIG. 5A ) has more than two welding areas 111- 114, and the width dimension of the welding areas 111-114 on the cross-section Sa is greater than or equal to 0.3mm (the cross-section needs to be >= 2 welding areas, and the welding area Width dimension on cross section Sa >=0.3mm). The so-called “majority” refers to more than half. In addition, in an embodiment, when the welding areas 111-114 are just on the diameter of the welding area Sb on the cross-section Sa, the width dimension of the welding areas 111-114 on the cross-section Sa is substantially equal to The width wb of the welding area Sb. Preferably, as shown in the embodiment (b) of FIG. 3 and FIG. 5A , the welding track Lf has two or more welding regions 111 to 114 on any cross-section Sa in the direction D. As shown in FIG. In the embodiment of FIG. 5A , the welding track Lf has four welding areas 111 - 114 on any cross-section Sa in the direction D. As shown in FIG. In one embodiment, preferably, the tensile strength of the welded portion generated by the welding track Lf is greater than 1Kgf (the tensile strength needs to be >1Kgf to meet the requirements). As shown in FIG. 4( a ), the width L1 of a single U-shape is 1.2±0.3 mm, and the length L3 thereof is 2±0.8 mm. The total width L2 of the two U-shapes is 3±0.8 mm, and the distance L4 between the center lines of the two U-shapes is 1.9±0.3 mm. As shown in FIG. 5A , the amplitude of the lateral path Wo is twice the amplitude or the distance L5 between the two farthest endpoints (in one embodiment, the line width of the moving path Lv of the welding track Lf) is 0.5±0.1 mm.

As shown in FIG. 2 and FIG. 5A , in one embodiment, the tensile test direction D is the extending direction of the negative electrode sheet 222 or the positive electrode sheet 221 extending from the battery device 220 . In one embodiment, the normal direction N of the transverse plane Sa is not perpendicular to the tensile test direction D. Preferably, the normal direction N of the transverse plane Sa is parallel to the tensile test direction D. In one embodiment, the tensile test direction D (the extending direction of the negative electrode sheet 222 or the positive electrode sheet 221 from the battery device 220 ) is the length direction of the welding pattern (U, I or S shape). As shown in FIG. 2 , the test direction D is the longitudinal direction of the U-shape. In one embodiment, the testing direction D is substantially parallel to the extending direction of the long axis of the battery device. In one embodiment, the test direction D is substantially parallel to the extending direction of the electrode sheet protruding from the battery device 220 . In one embodiment, the length direction of the welding pattern may be the extending direction of the moving path Lv with the longest length in the pattern.

FIG. 6 shows a cross-sectional view of a metal bonding structure according to an embodiment of the present invention. The description and effects of welding materials are as follows. The material of the electrode sheet and the conductive portion in the bonding structure 300 of the electrical contact may be metal of the same quality or different material according to different product requirements, and are welded on a PCBA (Printed Circuit Board Assembly). As shown in FIG. 6 , the structure of the bonding structure 300 is laminated from top to bottom, and includes a substrate 304 , a substrate 303 , a medium 302 and a carrier 301 . The thickness h4 of the base material 304 is 0.05-0.25 mm, and the material of the base material can be nickel, copper, nickel-plated copper, copper-nickel alloy, nickel-plated iron, or aluminum. The thickness h3 of the substrate 303 is 0.1-0.6 mm, and the substrate material can be nickel, copper, nickel-plated copper, copper-nickel alloy, Electroless Nickle Immersion Gold and Electroless Nickle Immersion Silver. The dielectric material may be solder, and the thickness h2 of the solder used as the medium 302 may be 0.05-0.15 mm. The carrier material can be PCB, metal plate, acrylic. The thickness h1 of the carrier 301 may be 0.5˜1.5 mm.

Referring again to FIG. 5A , the welding track Lf is configured as a lateral path Wo that performs wobble movement or oscillating movement in the lateral direction of the moving path Lv while moving on a moving path Lv. The moving path Lv is used to determine the main shape of the pattern of the welding track Lf, and the lateral path Wo is used to determine the width of the lines of the pattern of the welding track Lf. It should be noted that the present invention does not limit the main shape of the pattern, which may be a line shape or an arc shape. The line shape can be, for example, double straight lines, three straight lines, or two straight and two oblique lines. The arc shape can be, for example, a double-U, single-U, or S-line, etc., without end-point intersection. More specifically, the main shape of the pattern of the welding track Lf can be UU-shaped, U-shaped, III-shaped, IIII-shaped (preferably M-shaped or W-shaped), S-shaped and II-shaped. Wait. In one embodiment, it is preferably UU-shaped, U-shaped, M-shaped or W-shaped, and S-shaped, etc. The moving paths Lv of these figures do not only include parallel lines, so the reliability is higher. In one embodiment, it is preferably U-shaped or U-shaped, and the movement of such a font laser is easier to operate. The welding area can be increased and the tensile strength can be increased by the rocking movement or the oscillating movement in the lateral direction of the movement path Lv. In addition, since the laser beam moves in the forward direction and the lateral direction of the moving path Lv, heat accumulation can be reduced and excessive welding can be avoided.

7A shows a top view of an M-shaped weld trace with lateral rocking movement. Figure 7B shows a top view of the weld trace of a 6 helical spot weld. In the bonding structure 300, the pattern of the welding track Lf may cause the temperature to be too high to form a tin melting phenomenon, which may cause the substrate to fall off and form a defective product. When using a thermocouple temperature recorder to measure the vicinity of the welding seam of the welding track Lf, the welding temperature is the maximum value. The maximum temperature of the M-shaped solder pattern of FIG. 7A is 82.9°C. The maximum temperature of the welding pattern of the six helical points in FIG. 7B is 247.8°C. The welding pattern of the spiral point will cause a higher temperature due to the small distance between the trace lines and the trace lines. The welding pattern of the helical point is continuously welded from the inside to the outside by the spiral pattern, and the desired single point size is achieved. 7C shows a top view of another embodiment of an M-shaped welding track with lateral rocking movement. The embodiment in FIG. 7C is similar to the embodiment in FIG. 7A , the difference between the two is that the welding trajectories of the four lines in FIG. 7A are discontinuous, while the welding trajectories of the four lines in FIG. 7C are continuous. As shown in FIG. 7C , the welding track Lf may be continuous as long as it does not substantially overlap and cause excessive welding.

In one embodiment, since the copper material is a highly reflective material, the absorption rate of the laser light is low, and a large amount of energy is required in welding to penetrate copper and other metals for welding operations. However, due to the good thermal conductivity of copper, it is easy to affect the solder layer of the lower layer of the object to be soldered through heat conduction. In one embodiment, when the temperature exceeds 230°C, the bottom solder layer will melt, resulting in the generation of tin balls and tin slag, and damage The stability of the welding part, resulting in electrical abnormalities. The maximum temperature of the soldering pattern in FIG. 7B is 247.8° C., so the soldering stability is not good and the electrical properties are abnormal. On the other hand, in the present invention, different welding patterns can be used to produce With the characteristics of different surface temperature, it can control the welding strength of bimetal welding without damaging the solder layer of the lowest part and the PCBA copper foil.

FIG. 8A shows a top view of an M-shaped welding pattern with partial overlap. The part circled in FIG. 8A is the overlapping part, and more specifically, the center point of the laser beam is also overlapped in addition to the thermal diffusion area. FIG. 8B shows a cross-sectional view of the overlapping portion of FIG. 8A. As shown in FIG. 8B , due to the overlapping paths of the welding tracks Lf, it is easy to cause excessive welding at the same position, resulting in too high temperature and too deep penetration to form a penetration phenomenon, resulting in damage to the underlying copper foil and poor electrical properties; if When the positive electrode or negative electrode of the cylindrical battery is directly welded with the conductive part, the resulting melt-through phenomenon may even cause the danger of breakdown. In contrast, in the embodiment of the present invention, as shown in FIG. 7A and FIG. 7C , the soldering tracks Lf do not substantially overlap, and the paths of the soldering tracks Lf are independent, so as not to damage the bottommost solder layer And under the requirements of PCBA copper foil, it can control the welding strength of bimetal welding.

In the joint structure 300, the effective welding number and wire diameter of the cross-section of the welding pattern will affect the welding strength. When the number of welding areas is less than (<) 2 points, insufficient tension is likely to occur, resulting in abnormal shedding and manufacturing process. Instable ability, etc.

[pull test]

Hereinafter, for metal materials with different ratios of 0.15 copper and 0.4 nickel; and 0.1 copper and 0.4 nickel, different bonding structures 300 are formed with different patterns of welding tracks Lf, and tensile tests are performed on these bonding structures 300 . More specifically, Comparative Example 1 is the 6-dot pattern in FIG. 7B , Example 1 is the II pattern in FIG. 3( f ), Example 2 is the S pattern in FIG. 3( e ), and Example 3 is the S pattern in FIG. 3( a ) UU graphics, and the aforementioned real The metal ratio of Examples 1-3 or Comparative Example 1 was 0.15 copper to 0.4 nickel. In addition, Example 4 is the II pattern of FIG. 3(f), Example 5 is the III pattern of FIG. 3(c), Example 6 is the IIII pattern of FIG. 3(d), and Example 7 is FIG. 3(a) , and the metal ratio of each of the foregoing Examples 1-3 or Comparative Example 1 is 0.1 copper to 0.4 nickel. At the same time, the test results are listed in Table 1.

As shown in Table 1, for the welding pattern of the 6 helical points shown in Figure 7B, the minimum value of the tensile test is less than 1Kgf. Therefore, its welding stability is poor. In contrast, the welding patterns of each embodiment in Table 1 of the present invention are all greater than 1 Kgf in the tensile test. In addition, CPK in Table 1 refers to the process capability index, and the higher the value, the more stable it is.

According to an embodiment of the present invention, a method for manufacturing a bonding structure 300 of an electrical connection point is provided for manufacturing the aforementioned bonding structure 300 . The manufacturing method includes the following steps.

Step S02: Using a high-energy ray to irradiate an interface formed by overlapping an electrode sheet and a conductive portion. The first metal material of 222 is mixed with the second metal material of the conductive portion 231 of the circuit carrier 230 to form a material mixed portion.

Step S04: Move the high-energy line along the moving path Lv.

Step S06 : the high-energy wire is made to shake or oscillate in the lateral direction of the moving path Lv to form a lateral path Wo, thereby forming a welding track Lf.

In one embodiment, the step of using a high-energy beam generated by a high-energy beam generating device in step S02 includes the following steps. Step S20 : control the output energy range of the high-energy wire generating device to a power of 70-100W; and Step S40 : make the high-energy wire move on the moving path Lv at a welding speed of 70-90 mm/sec. In addition, the power of the energy required per unit time at any point on the path is fixed, and only varies according to the material, so when the power in the energy interval is greater, the moving speed of the welding is faster. Smaller, the slower the welding movement speed.

To sum up, the bonding structure of the electrical connection point according to an embodiment of the present invention has a soldering track, and the paths of the soldering tracks do not overlap, so that the bottom of the circuit carrier is not damaged and the first metal material and the first metal material are improved. The strength of the welding of two metal materials. In one embodiment, the bonding structure of the electrical connection point can be used in the battery module as the bonding structure between the battery device and the circuit carrier. In one embodiment, the welding track has more than two welding areas on a cross-section, preferably the welding areas are on the cross-section. The width dimension is greater than 0.3mm, so as to meet the requirements of tensile test and reduce the situation of poor welding stability. In one embodiment, the circuit carrier is a PCBA copper foil, so the soldering strength of the bimetal material can be improved without damaging the solder layer and the PCBA copper foil of the lowest part of the circuit carrier.

111-114: Welding area

Lf: welding track

Lv: movement path

Sa: cross section

Wo: Lateral Path

Claims (9)

A battery module, comprising: a joint structure of an electrical connection point, comprising: a conductive part; and an electrode piece welded to the conductive part, wherein the electrode piece is a first metal material, and the conductive part is a For the second metal material, a welding track is formed at the interface between the electrode sheet and the conductive portion, and the welding track is formed by mixing the first metal material and the second metal material. The welding track does not substantially overlap, and the welding track The track includes a moving path; and a lateral path for shaking or oscillating movement in the lateral direction of the moving path, and the welding track has more than 2 welding areas on a cross-section, and at least one battery device includes the battery. the electrode sheet of the bonding structure of the connection point, and the electrode sheet extends from the body of the at least one battery device; and a circuit carrier including the conductive portion of the bonding structure of the electrical connection point, wherein the cross-section method The line direction is not perpendicular to the extending direction of the electrode sheet extending from the at least one battery device. The battery module according to claim 1, wherein the graphics of the movement path are UU-shaped, U-shaped, V-shaped, III-shaped, IIII-shaped, M-shaped, W-shaped, VV-shaped, S-shaped or II-shaped. The battery module of claim 1, wherein, The track length of the welding track is greater than 0.5 mm, and the width dimension of the welding regions on the cross section is greater than 0.3 mm. The battery module according to any one of claims 1 to 3, wherein the tensile strength of the welded portion generated by the welding track is greater than 1 Kgf. The battery module according to any one of claims 1 to 3, wherein the welding track uses a high-energy ray to irradiate the interface between the electrode sheet and the conductive portion, so that the first metal material and the second metal material are mixed . The battery module according to any one of claims 1 to 3, wherein the normal direction of the cross section is parallel to the extending direction of the electrode sheet extending from the at least one battery device. The battery module according to any one of claims 1 to 3, wherein the extending direction of the electrode sheet extending from the at least one battery device is a length direction of the pattern of the moving path. A manufacturing method of a bonding structure of an electrical connection point, which is used to manufacture a bonding structure of an electrical connection point, the bonding structure of the electric connection point comprising: a conductive part; and an electrode piece, which is welded to the conductive part, wherein the The electrode piece is made of a first metal material, and the conductive part is a second metal material, a welding track is formed at the interface between the electrode piece and the conductive part, and the welding track is the first metal material and the second metal Mixed materials, the welding track does not substantially overlap, the welding track includes a moving path; and a lateral path of rocking or oscillating movement lateral to the moving path, and the welding track is on a transverse plane There are two or more welding regions, wherein the manufacturing method includes: Irradiate the interface formed by the superposition of the electrode sheet and the conductive portion with a high-energy ray to mix the first metal material and the second metal material; move the high-energy ray along the moving path; and make the high-energy ray The wire performs a rocking or oscillating movement lateral to the moving path to form the lateral path, thereby forming the welding track. The method for manufacturing a bonding structure of an electrical connection point as claimed in claim 8, wherein the step of using a high-energy ray generated by a high-energy ray generating device comprises: controlling the output energy of the high-energy ray generating device The power ranged from 70-100W; and the welding speed for moving the high-energy wire on the travel path was 70-90mm/sec.

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