JP3698030B2 - Junction box and junction box assembly method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a junction box connected to an automobile wire harness and a method for assembling the junction box, and in particular, enables a reduction in thickness and size even when the number of circuits increases.
[0002]
[Prior art]
Recently, with the rapid increase in electrical components mounted on automobiles, the number of parts accommodated in electrical junction boxes for automobiles, especially the number of circuits accommodated inside junction boxes, has increased to form a branch circuit with high density. It has become very large, and it takes a lot of assembly work.
[0003]
Among the electrical connection boxes for automobiles, in the junction box 1 shown in FIG. 9, the bus bars 5 </ b> A to 5 </ b> D are stacked and disposed with the insulating plates 4 </ b> A to 4 </ b> E interposed between the upper case 2 and the lower case 3. The upper case 2 is provided with a connector housing portion 2a, a relay housing portion 2b, and a fuse housing portion 2c, and a connector 6, a relay 7 and a fuse 8 are mounted on these housing portions and projecting from these terminals and the bus bar. It is connected to the tab directly or via a relay terminal. The lower case 3 is also provided with a connector housing portion 3a, and the bus bar tab 5a protrudes and is connected to the connector.
[0004]
[Problems to be solved by the invention]
In the junction box 1, the area of the bus bar and the number of stacked layers increase as the number of circuits increases, and there is a problem that the junction box increases in size. In addition, when the connector case, the relay case, and the fuse case are provided in both the upper case and the lower case, and the connector, relay, fuse and internal circuit are connected to the upper and lower surfaces of the junction box, the upper case or Compared with the case where it is provided only on one side of the lower case, an increase in the area of the junction box can be suppressed.
[0005]
However, if the connector accommodating portion and the relay accommodating portion or the fuse accommodating portion are provided at the upper and lower facing positions, the tabs that are refracted from the bus bar cannot be overlapped and deployed, so it is necessary to provide a tab on the other bus bar, Causes to increase. As described above, when the number of bus bar layers increases, there is a problem in that the junction box becomes taller and larger.
[0006]
In addition, since the connector, fuse and relay are connected to the bus bar in the junction box, the entire internal circuit must be changed when the specification changes that change the connection between the fuse, relay and internal circuit. Therefore, there was a problem that the circuit change could not be easily handled.
[0007]
The present invention has been made in view of the above problems, and a bus bar layer accommodated in a junction box by modularizing a connector connection circuit portion, a fuse connection circuit portion, and a relay connection circuit portion in a circuit in the junction box. It is an object of the present invention to suppress the increase in the number, to reduce the thickness of the junction box, and to easily cope with a circuit change.
In addition, when modularized as described above, the welding workability is improved so that the bus bars of each module are welded together, and the assembling workability of the modules to the upper case and the lower case is improved. This is also an issue.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention divides a connector connection circuit unit, a fuse connection circuit unit and / or a relay connection circuit unit accommodated in an upper case and a lower case of a junction box,
A connector module in which bus bars connected to the connector are arranged on an insulating plate;
Arranging only the bus bar for fuse connection on an insulating plate different from the insulating plate of the connector module, and a fuse module in which a fuse terminal is connected only to these bus bars
Arrange only the bus bar for relay connection on an insulating plate different from each insulating plate of the connector module and the fuse module, and separately provide as a relay module in which the relay terminal is connected only to these bus bars ,
A fuse module and / or a relay module are vertically stacked on the connector module,
Has a tab bent in vertical direction to the end of the bus bar that will be arranged in the insulating plate of each module, superimposed tabs each other of the module, toward the mating the mating surface of one of the tabs Protruding protrusions are provided, the protrusions are crushed and welded during welding ,
Boss with either the other welding positioning the boss fittable upon between the tabs projecting bosses toward the vertical direction either over the liver joules insulating plate which is arranged to overlap A hole is provided, and the boss hole is a long hole extending in a direction allowing movement from a standby position where the tabs are separated from each other by a protrusion to a joining position where the protrusion is crushed and the mating surfaces of the tabs abut. We provide a junction box characterized by this.
[0009]
As described above, in the junction box of the present invention, the connector connection circuit connected to the external electric wire via the connector, the fuse connection circuit, and the relay connection circuit are divided into separate connector modules, fuse modules, and relay modules. Provided. That is, the base circuit bus bar for connector connection, the fuse bus bar, and the relay bus bar are provided separately.
[0010]
Conventionally, a single conductive plate is punched out to provide a connector connection circuit, a fuse connection circuit, and a relay connection circuit, and each of the above circuits has a connector connection tab, a fuse connection tab, and a relay connection tab. As a result, circuit handling becomes complicated, and as a result, the area of the bus bar is increased and the bus bar is multi-layered.
On the other hand, in the present invention, the connector connecting bus bar, the fuse connecting bus bar, and the relay connecting bus bar are divided, punched from separate conductive plates, and arranged at different positions, so that the tabs overlap. Thus, the bus bar is prevented from being multi-layered, and the junction box can be made thinner. In addition, each bus bar can be easily routed, so that each bus bar area can be reduced. As a result, even if the bus bars are divided, the overall bus bar area can be reduced, and an increase in the junction box area can be suppressed. it can.
[0011]
Furthermore, since the connector module, fuse module, and relay module are provided separately, if there is a change in the specifications of any of the connector circuit, fuse circuit, or relay circuit, only the changed connector module, fuse module, or relay module It is sufficient to change the specification, and it is possible to easily cope with the specification change. As described above, the bus bar for connector connection and the bus bar for fuse and / or relay connection are divided but welded, so that the electrical connection reliability is not lowered.
Specifically, the tabs are joined to each other and connected by ultrasonic welding, resistance welding, or leather welding. Since the projection part which protrudes toward the other party is provided in at least one of the mating surfaces of the tabs to be overlapped among the tabs, a reliable welding surface can be obtained by the projection part being crushed as a welding point. .
[0012]
When a fuse module and / or a relay module are horizontally stacked with respect to the connector module, a boss projecting in a vertical direction on one of the insulating plates is formed by a long hole provided in either one Since the tabs are overlapped on the vertical plane through the protrusions by being inserted into the boss holes and positioned, the tabs can be accurately positioned and the protrusions are connected to the welding points. Thus, reliable welding can be performed. Further, when the tabs are welded while being compressed, the modules arranged in a superimposed manner along with the crushing of the protrusions move relatively, but the movement of the boss accompanying this is changed to a long boss hole. Therefore, stress can be prevented from being applied to the welded tabs, and the tabs can be connected to each other by welding reliably.
[0013]
When the module after being welded by the tab is placed in the lower case, a positioning pin protruding from the lower case is inserted into the positioning hole provided at a corresponding position between the insulating plates of the module and assembled. Thereafter, since the upper case is fitted to the lower case, the module after welding can be reliably positioned and held with respect to the lower case. Further, if the tabs are welded incompletely and misaligned, the positioning pin is not inserted into the positioning hole, so that the misalignment state can be easily found.
[0014]
Further, although the fuse module and the relay module are provided separately, they may be integrated into a combined fuse / relay module. In this case, the fuse bus bar and the relay bus bar are fixed on a common insulating plate. When it is necessary to connect the circuits of the fuse bus bar and the relay bus bar, the bus bars of the circuit are welded together. Alternatively, a bus bar may be provided integrally. The fuse bus bar and the relay bus bar are individually provided with bus bars respectively connected to the fuse terminals and the relay terminals.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic exploded perspective view of components constituting a junction box 10 connected to an automobile wire harness.
[0016]
In FIG. 1, 11 is a lower case, 12 is an upper case, 13 is a connector module, 14 is a fuse module, and 15 is a relay module. A connector module 13, a fuse module 14, and a relay module 15 are accommodated in a case composed of the lower case 11 and the upper case 12.
[0017]
The lower case 11 is provided with a large number of connector accommodating portions 11a protruding, and a plurality of relay accommodating portions 11b are provided in series in the long side direction on one side of the long side direction. The upper case 12 is provided with a fuse accommodating portion 12a on one side in the short side direction. Moreover, the connector accommodating part 12e is provided in the surrounding wall of the other side part of a short side direction. The lower case 11 and the upper case 12 have a peripheral wall fitted and locked to each other, and a bracket 12d for fixing the vehicle body projects from the upper case 12.
[0018]
The connector module 13 has connector connection bus bars 16 stacked in the vertical direction via insulating plates 17, and in this embodiment, the connector bus bars 16 have four layers. In the connector module 13 of FIG. 1, it has shown schematically in the state which has arrange | positioned the insulating board 17 in the uppermost layer. The bus bar 16 and the insulating plate 17 may be formed by resin-molding the bus bar 16 to form the insulating plate 17, and the multilayer bus bar 16 may be integrated.
[0019]
Each layer of the connector connecting bus bar 16 of the connector module 13 is formed by punching one conductive plate to form a circuit portion 16a having a required shape. A welding tab 16b that protrudes from the circuit portion 16a toward the lower case 11 is provided so as to protrude from the terminal hole 11c of the connector housing portion 11a provided in the lower case 11. A connector (not shown) connected to the tip of the wire harness is fitted into the connector housing portion 11a so that the terminal in the connector is connected to the tab 16b.
[0020]
Further, the required circuit portion 16 a of the connector bus bar 16 includes welding tabs 16 c and 16 d that protrude vertically from the hole on the upper surface of the insulating plate 17, and a welding tab that protrudes horizontally from the peripheral edge of the insulating plate 17. 16e is provided. The tabs 16 c and 16 e are tabs with the fuse bus bar 20 provided in the fuse module 14, and the tab 16 d is a tab with the relay bus bar 30 provided in the relay module 15.
[0021]
That is, the tabs 16c and 16d are superposed in the vertical direction and welded to the welding tab 20a of the fuse bus bar 20 and the welding tab 30a of the relay bus bar 30. The tab 16e is welded so as to overlap with the welding tab 20b of the fuse bus bar 20 in the vertical and horizontal directions.
A large number of these tabs 16c, 16d, and 16e project in parallel. Then, the tabs 16c, 16d (20a, 30a) bent in the vertical direction in the connector module 13, the fuse module 14, and the relay module 15 are formed on at least one of the mating surfaces as shown in FIG. A protrusion P having a protrusion dimension L1 protruding toward the other side is provided. This protrusion P is for facilitating welding as a welding point when the tabs 16c, 16d, 20a, 30a are overlapped and welded by applying pressure. 16c, 16d, 20a, and 30a are surface-bonded.
[0022]
The fuse module 14 is formed by molding the fuse bus bar 20 in a configuration in which the fuse bus bar 20 is arranged between the two insulating plates 22A and 22B. These fuse bus bars 20 are individually provided to be connected to the fuse terminals 25a and 25b. As shown in FIG. 2 (with the insulating plate removed), the large number of fuse bus bars 20 are connected to terminal portions 20c-1 and 20c at one end of horizontal portions 20e-1 and 20e-2 fixed to the substrate 21, respectively. -2 is refracted and provided with pressure contact grooves 20d-1 and 20d-2 into which the terminals 25a and 25b of the fuse 25 are fitted. The ends of the bus bar 20 connected to the terminals 25a and 25b project from the peripheral edges in the opposite directions to form the tabs 20a and 20b described above. Then, one tab 20a is horizontally projected from one side edge of the substrate 21 and then bent so as to rise in the vertical direction so as to overlap the tab 16c of the connector bus bar 16 on a vertical plane. Yes. The other tab 20b protrudes in the horizontal direction from the peripheral edge of the other side, and then is refracted downward in a step shape so as to overlap the tab 16e of the connector bus bar 16 vertically on the horizontal plane. The fuse bus bar 20 may be fixed by setting a rib for caulking on an insulating plate, making a hole in the bus bar, arranging the bus bar through the hole, and caulking the rib.
[0023]
The relay module 15 has a configuration substantially similar to that of the fuse module 14, and a large number of relay bus bars 30 are fixed between the upper and lower insulating plates 31A and 31B. These relay bus bars 30 are also connected to the relay terminals. There are separate bus bars that are provided separately. As shown in FIG. 3 (with the insulating plate removed), the large number of bus bars 30 refract one end of the horizontal portion 30b fixed to the insulating plate and project the terminal portion 30c. A pressure contact groove 30d into which the terminal 35a is fitted is provided. The other end of the bus bar 30 is the above-described tab 30a, which is refracted into an L shape and joined in a vertical direction to the tab 16d of the connector bus bar 16.
[0024]
Next, a configuration for positioning the tabs 16c and 20a and the tabs 16d and 30a with respect to the connector module 13 in a state where the fuse module 14 and the relay module 15 are overlapped in the horizontal direction will be described. As shown in FIG. 1, between the connector module 13 and the fuse module 14, a pair of bosses 51 project in the vertical direction at both ends of the arrangement position on the insulating plate 17.
On the other hand, positioning boss holes 52 into which the bosses 51 can be inserted are formed at corresponding positions of the insulating plates 22A and 22B of the fuse module 14. The boss hole 52 moves from the standby position separated by the dimension L1 by the projection P when the tabs 16c and 20a are overlapped to a joining position where the projection P is crushed by welding and the mating surfaces of the tabs 16c and 20a abut against each other. It is a long hole extending in a direction that allows
[0025]
Further, when the tabs 16c and 20a are welded to the insulating plates 17, 22A and 22B of the connector module 13 and the fuse module 14, a pair of positioning holes 53 and 54 communicating with each other are provided with the boss 51 and the boss 51. Each is formed adjacent to the hole 52. A pair of positioning pins 55 that can be inserted into the positioning holes 53, 54 in communication with each other are provided at required positions of the lower case 11 corresponding to the positioning holes 53, 54.
[0026]
Similarly, between the connector module 13 and the relay module 15, a pair of bosses 56 project from the lower surface of the insulating plate 17 on which the connector module 13 is to be disposed. A boss hole 57 consisting of a long hole is provided correspondingly. Similarly, a pair of positioning holes 58 and 59 that communicate with each other are provided at the joint positions after welding of the tabs 16d and 30a, and a pair of positioning pins 60 that can be inserted into the positioning holes 58 and 59 are projected into the lower case 11. Has been established. In the present embodiment, one of the positioning holes 58 for the relay module 15 in the connector module 13 is shared with the positioning hole 53 for the fuse module 14, and similarly, one of the positioning pins 60 in the lower case 11 is used as the positioning pin 55. I share it. Of course, the positioning hole 58 and the positioning pin 60 may be set at different positions according to the arrangement state of the relay module 15.
[0027]
When assembling the junction box 10 from the above-described components, first, the fuse module 14 is placed on top of one side of the connector module 13. At this time, as shown in FIGS. 5A and 5B, by inserting the boss 51 on the connector module 13 side into the boss hole 52 on the fuse module 14 side, the corresponding tabs 16c and 20a on both sides are vertical planes. Try to be superimposed on top. At this time, due to the presence of the projecting portion P projecting from the tab 20a, a standby position having a required interval is formed between the mating surfaces, and the boss 51 is fitted at a position biased toward the tab 20a in the boss hole 52. Next, when the corresponding tabs 16c and 20a are welded while being compressed with a resistance welder (not shown), for example, the protrusion P is crushed as a welding point, so as shown in FIGS. 6 (A) and 6 (B). The tabs 16c and 20a move relatively to the joining position where the mating surfaces abut. That is, the movement between the connector module 13 and the fuse module 14 is absorbed by the boss 51 and the boss hole 52, and the tabs 16c and 20d are allowed to move only in the direction from the standby position to the joining position. Therefore, even if the pitch of the tabs 16c and 20d arranged side by side is narrow, it is possible to prevent contact with other adjacent tabs 16c and 20d. After the welding is completed, the boss 51 is moved to the other end side of the boss hole 52. The connector module 13 and the fuse module 14 are joined by superimposing and welding the tab 20b that protrudes horizontally from the other peripheral edge of the fuse module 14 to the tab 16e that protrudes horizontally from the peripheral edge of the connector module 13. I am doing so.
[0028]
Although detailed explanation is omitted, when the relay module 15 is arranged on the lower surface of the connector module 13, the movement restriction in the welding direction by the boss 56 and the boss hole 57 is restricted as in the case of the fuse module 14. They are used to join them together.
[0029]
As described above, the fuse module 14 is mounted on the upper part of one side of the short side of the connector module 13, the relay module 15 is arranged on the side of the long side, and these are integrated. To house. At that time, the positioning holes 53 and 54 provided between the connector module 13 and the fuse module 14 and the positioning holes 58 and 59 provided between the connector module 13 and the relay module 15 are appropriately welded. Thus, as shown in FIG. 6 (B), it is in a penetrating state in which its axial centers coincide. Then, as shown in FIG. 7, the corresponding positioning pins 55 and 60 projecting from the lower case 11 are inserted into the positioning holes 53 and 54 and the positioning holes 58 and 59 so that the connector module 13 is inserted into the lower case 11. Assemble. By the assembly, the terminal portion 16b of the connector module 13 is located in the connector housing portion 11a, and the terminal portion 30c of the bus bar of the relay module 15 is located in the relay housing portion 11b.
[0030]
Next, an electronic control unit (not shown) is mounted on the upper portion of the connector module where no fuse module is mounted. Thereafter, the upper case 12 is assembled. In that case, the terminal part 20c of the bus bar 20 for fuses fixed to the fuse module 14 is arrange | positioned at the fuse accommodating part 12a of the upper case 12. FIG.
Next, the upper case 12 and the lower case 11 are lock-coupled to complete the assembly of the junction box 10.
[0031]
When the fuse 25 and the relay 35 are inserted into the fuse housing portion 11a and the relay housing portion 11b, respectively, the junction box 10 is fitted and connected to the pressure contact grooves 20d and 30d of the bus bars 20 and 30.
[0032]
In the above embodiment, the fuse module and the relay module are separated from each other. However, a composite module in which the fuse module and the relay module are integrated may be used. In that case, as shown in FIGS. 8A and 8B, the upper case 12 ′ is provided with a fuse housing portion 12a ′ and a relay housing portion 12b ′ where the terminal portions of the bus bars provided in the composite module are located. Yes. Further, the lower case 11 ′ is provided with only the connector housing portion 11a ′ where the terminal portion of the bus bar of the connector module is located. In the above embodiment, the bosses 51 and 56 are provided on the connector module 13 side. However, the bosses 51 and 56 are provided on the fuse module 14 side and the relay module 15, and the boss holes 52 and 57 are provided on the connector module 13. You may make it provide in. As the welding means in the above embodiment, ultrasonic welding, leather welding, or the like can be employed in addition to resistance welding.
[0033]
The junction box of the present invention is not limited to the above-described embodiment, and the connector module, the fuse module, and the relay module may be further divided into two, and each may be constituted by two divided modules. When the connector module, the fuse module, and the relay module are divided, when the specifications change in the connector connection circuit, the fuse connection circuit, and the relay connection circuit, only the changed module needs to be replaced. However, if it is divided too much, it takes a lot of assembly work. Therefore, in a large junction box, it is preferable that the connector module, the fuse module, and the relay module are each divided into about two.
[0034]
The welding pattern of the connector connecting bus bar of the connector module, the fuse bus bar of the fuse module, and the relay bus bar of the relay module is set to the following pattern according to the circuit design.
(1) Connector connection bus bar and fuse bus bar (2) Connector connection bus bar and relay bus bar (3) Connector connection bus bar, fuse bus bar, relay bus bar In this case, one end of the connector bus bar of one circuit The fuse bus bar is welded to the tab of the connector, the relay bus bar is welded to the tab at the other end of the connector bus bar, and the tab provided at the other part of the connector bus bar is connected to the connector. .
[0035]
【The invention's effect】
As is clear from the above description, according to the junction box of the present invention, the connector module provided with only the connector connecting bus bar, the fuse module provided only with the fuse connecting bus bar, and the relay provided only with the relay connecting bus bar. Since the module is provided separately and the bus bar is divided, the tabs for connecting to the connectors, fuses and relays do not overlap and do not overlap each other, so that the bus bars are stacked to provide the tabs. There is no need to increase the number. As a result, the junction box can be thinned. When welding, the bosses and boss holes provided between the modules and the positioning pins and positioning holes can be used for positioning, so that the tabs arranged at a narrow pitch can be welded and joined to each other without shifting. The module can be accommodated without being displaced even when it is accommodated in the lower case.
[0036]
In addition, since the bus bar is divided as described above, the circuit of the bus bar is simplified and the required area can be reduced. As a result, even if the bus bars are divided and the ends of the bus bars are connected by welding, the occupied area is not increased as a whole, and the area of the junction box is not increased.
[0037]
In addition, if there is a change in the specifications of the connector connection circuit, fuse connection circuit, and relay connection circuit, only the connector module, fuse module, relay module, or composite module of these specifications need to be changed. Since the upper case and lower case can be shared, it is possible to respond to specification changes quickly and inexpensively.
[Brief description of the drawings]
FIG. 1 is a schematic exploded perspective view of a junction box according to a first embodiment of the present invention.
FIG. 2 is a schematic view showing a fuse bus bar.
FIG. 3 is a schematic view showing a relay bus bar.
FIG. 4 is a cross-sectional view of a main part in a state in which a connector module and a fuse module are overlaid.
5A is a plan view of a state before welding in which a fuse module and a relay module are superimposed on a connector module, and FIG. 5B is a cross-sectional view of a main part.
6A is a plan view of a state after welding in which a fuse module and a relay module are superposed on a connector module, and FIG. 6B is a cross-sectional view of a main part.
FIG. 7 is a cross-sectional view of a main part in a state where a lower case is further fitted in the state of FIG. 6 (B).
8A and 8B show another embodiment, in which FIG. 8A is a plan view and FIG. 8B is a bottom view.
FIG. 9 is an exploded perspective view showing a conventional junction box.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Junction box 11 Lower case 12 Upper case 13 Connector module 15 Relay module 16 Connector connection bus bar 16c, 16d Tab 16e Tab 17 Insulation plate 20 Fuse bus bar 20a Tab 20b Tab 22A, 22B Insulation plate 30 Relay bus bar 51 Boss 52 Boss hole 53, 54 Positioning hole 55 Positioning pin 56 Boss 57 Boss hole 58, 59 Positioning hole 60 Positioning pin P Projection

Claims (4)

Divide the connector connection circuit part, fuse connection circuit part and / or relay connection circuit part accommodated in the upper case and lower case of the junction box,
A connector module in which bus bars connected to the connector are arranged on an insulating plate;
Arranging only the bus bar for fuse connection on an insulating plate different from the insulating plate of the connector module, and a fuse module in which a fuse terminal is connected only to these bus bars
Arrange only the bus bar for relay connection on an insulating plate different from each insulating plate of the connector module and the fuse module, and separately provide as a relay module in which the relay terminal is connected only to these bus bars ,
A fuse module and / or a relay module are vertically stacked on the connector module,
Has a tab bent in vertical direction to the end of the bus bar that will be arranged in the insulating plate of each module, superimposed tabs each other of the module, toward the mating the mating surface of one of the tabs Protruding protrusions are provided, the protrusions are crushed and welded during welding ,
Boss with either the other welding positioning the boss fittable upon between the tabs projecting bosses toward the vertical direction either over the liver joules insulating plate which is arranged to overlap A hole is provided, and the boss hole is a long hole extending in a direction allowing movement from a standby position where the tabs are separated from each other by a protruding portion to a joining position where the protruding portion is crushed and the mating surfaces of the tabs contact each other. A junction box characterized by that.   A positioning hole is formed in a corresponding portion of the upper and lower insulating plates at the joining position after welding in the insulating plate of the module arranged in a stacked manner, and a positioning pin that can be inserted into the positioning hole in the lower case The junction box according to claim 1, wherein: Divide the connector connection circuit part, fuse connection circuit part and / or relay connection circuit part accommodated in the upper case and lower case of the junction box,
A connector module in which bus bars connected to the connector are arranged on an insulating plate;
Arranging only the bus bar for fuse connection on an insulating plate different from the insulating plate of the connector module, and a fuse module in which a fuse terminal is connected only to these bus bars
Arrange only the bus bar for relay connection on an insulating plate different from each insulating plate of the connector module and the fuse module, and separately provide as a relay module in which the relay terminal is connected only to these bus bars ,
Provided the tabs bent in a direction perpendicular to the plane of the insulating plate to the ends of the bus bar that will be arranged in the insulating plate of each module, superimposed tabs each other of the module, tabs superimposed of said tab Providing a protrusion that protrudes toward the other side on at least one of the mating surfaces of each other,
When the fuse module and / or the relay module are vertically stacked with respect to the connector module, a boss projecting in the vertical direction on one of the insulating plates is formed by a long hole provided in either of the other. By positioning by inserting into the boss hole, the tabs are overlapped on a vertical plane via the protrusions,
Next, the tabs are welded while being compressed, and at the same time, the movement between the stacked modules that move relative to each other as the projections are crushed is moved by the long hole of the boss hole into which the boss is fitted. A method for assembling a junction box, characterized in that it is absorbed.   When the module after being welded by the tab is placed in the lower case, a positioning pin protruding from the lower case is inserted into the positioning hole provided at a corresponding position between the insulating plates of the module, and then assembled. 4. The method of assembling a junction box according to claim 3, wherein an upper case is fitted to the lower case.

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