JP7339894B2 - Terminal connection structure - Google Patents

Description

The present invention relates to a terminal connection structure for connecting a plate-like terminal and a plate-like member with a fastening member.

Conventionally, there is known a terminal connection structure in which a plate-like terminal such as a bus bar and another plate-like member are fastened with a fastening member such as a bolt. In order to obtain good conductivity and prevent rust on the surface, a plating layer made of Sn--Pb alloy is generally formed on the surface of the bus bar.

By the way, in recent years, lead (Pb), which is bad for the environment, is being regulated under the RoHS Directive. For this reason, it is preferable to use tin (Sn) plating that does not use lead for the plating layer. However, when the fastening member is used for fastening, stress acts on the contact area of the busbar where the plate member contacts. Along with this, the tin plating in the plating layer in the contact area may be pushed out of the contact area and protrude, and whiskers, which are needle-like metal foreign substances, may be generated and elongated from the protuberance. . Since whiskers are likely to break and fall off due to vibration or the like, the fallen whiskers may scatter and cause electrical failures such as short circuits in terminals and circuits. Therefore, there has been conventionally proposed a technique for preventing the scattering of whiskers by forming a recess in the terminal to cover the generated whiskers (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2006-310089 (see FIG. 4)

However, since the depression described in Patent Document 1 is open toward the outside, broken whiskers are likely to scatter outside from the opening of the depression. Therefore, in this case also, problems such as a short circuit due to scattering of whiskers may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a terminal connection structure capable of preventing scattering of whiskers.

In order to solve the above problems, the invention described in Means 1 includes a plate-like terminal made of a metal material and having a metal film formed on its surface, a plate-like member arranged on the plate-like terminal, and a plate-like member arranged on the plate-like terminal. A terminal connection structure including a fastening member that fastens the plate-like terminal and the plate-like member in a state in which at least a portion of the plate-like member overlaps when viewed from above, wherein the plate-like member is attached to the surface of the plate-like terminal. A portion where the area including the edge portion contacts is a pressure contact portion with which the plate-like member is pressed, and at least one of the plate-like terminal and the plate-like member has a recessed whisker for accommodating a whisker generated at the pressure contact portion. An accommodating space is formed, the whisker accommodating space is arranged radially outward of the fastening member relative to the pressure contact portion with the pressure contact portion as a starting point, and at least one of the plate-like terminal and the plate-like member has a convex portion. The gist of the present invention is a terminal connection structure, wherein the convex portion is formed radially outward of the fastening member relative to the whisker accommodation space.

Therefore, according to the invention described in Means 1, since the opening of the whisker accommodation space is narrowed (or closed) by the projection, even if the whisker is broken, the whisker is stopped by the projection. stays in the whisker containment space. Therefore, it is possible to prevent the whisker from scattering outside the whisker accommodation space, thereby preventing the occurrence of an electrical failure such as a short circuit caused by the scattering of the whisker.

In the invention described in means 2, in means 1, the whisker accommodating space is formed on the plate-like member side, and the plate-like terminal is provided outside the whisker accommodating space in the plate-like member in the radial direction of the fastening member. The gist thereof is that the convex portion protruding to the side is arranged.

Therefore, according to the invention described in means 2, even if the whisker is broken, the whisker is prevented from scattering outside the whisker accommodation space by being stopped by the convex portion. Therefore, it is possible to prevent the occurrence of electrical troubles such as short circuits caused by scattering of whiskers. In addition, since the whisker accommodation space and the projection are formed on the plate-like member, it is not necessary to provide the plate-like terminal with a structure for preventing scattering of the whiskers.

The gist of the invention described in means 3 is that in the means 2, the plate-like member has a thickness smaller in a region where the convex portion is formed than in a region in contact with the pressure contact portion.

Therefore, according to the invention described in Means 3, when the fastening member is used for fastening, the area of the plate-like member in contact with the pressure-contact portion bites into the plate-like terminal, so that the tip of the protrusion touches the metal film of the plate-like terminal. can be brought closer to or abutted against. As a result, the opening of the whisker accommodation space is narrowed or blocked by the convex portion, so even if whiskers are generated at the pressure contact portion, scattering of the whiskers can be effectively prevented. Further, even if the convex portion contacts the plate-like terminal during fastening, the convex portion is thinner than the area of the plate-like member that contacts the pressure-contact portion, so that the force with which the plate-like member presses the pressure-contact portion is smaller than that. Contact the metal film with force. As a result, it becomes difficult for stress to concentrate on the contact portion between the convex portion and the metal film, so that the generation of whiskers in the vicinity of the convex portion can be prevented.

In the invention described in means 4, in means 1, one of the plate-like terminal and the plate-like member is formed with a recess partly containing the whisker accommodating space, and the other of the plate-like terminal and the plate-like member protrudes into the recess. The gist is that the convex portion is formed.

Therefore, according to the invention described in means 4, since the path connecting the whisker accommodating space and the outside becomes a so-called labyrinth structure, even if the whisker breaks and scatters, the whisker in the whisker accommodating space is released to the outside. become difficult.

The gist of the invention described in means 5 is that in any one of means 1 to 4, the whisker accommodation space is arranged radially outside the fastening member from the fastening portion of the fastening member. .

Therefore, according to the invention described in means 5, since the whisker accommodation space is arranged to avoid the region where the fastening force of the fastening member is applied, it is possible to prevent the fastening force of the fastening member from decreasing due to the presence of the whisker accommodation space. be able to.

As detailed above, according to the first to fifth aspects of the present invention, it is possible to provide a terminal connection structure capable of preventing scattering of whiskers.

The schematic perspective view which shows the attachment aspect of a terminal block with respect to a case. The front view which shows the attachment aspect of a terminal block with respect to a case. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 2 is a perspective view of a main part showing a terminal connection structure; FIG. 3 is a cross-sectional view of a main part showing the terminal connection structure (enlarged view of B in FIG. 3); FIG. 2 is an enlarged cross-sectional view of a main part showing a terminal connection structure; The perspective view which shows the state when a terminal block is seen from below. FIG. 2 is an exploded perspective view showing a terminal connection structure; FIG. 4 is a cross-sectional view of a main part showing a terminal connection structure after fastening with bolts and nuts; FIG. 4 is an enlarged cross-sectional view of a main part showing a terminal connection structure in another embodiment; FIG. 4 is an enlarged cross-sectional view of a main part showing a terminal connection structure in another embodiment; FIG. 4 is an enlarged cross-sectional view of a main part showing a terminal connection structure in another embodiment;

An embodiment embodying the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic perspective view showing a case 1 and a terminal block 10 attached to the case 1. FIG. The case 1 of the present embodiment is an automobile case installed in an engine room or a room, and contains circuits functioning as, for example, a PCU (power control unit) or an ECU (electronic control unit). Boards and the like are accommodated. One side wall 2 of the case 1 is provided with an oblong through-hole 3a arranged in the center of the side wall 2 and a pair of screw holes 3b arranged on both sides of the through-hole 3a.

As shown in FIGS. 1 to 4, the body member 20 constituting the terminal block 10 is injection molded using a resin material such as PPS resin (polyphenylene sulfide resin) or PBT resin (polybutylene terephthalate resin). It is a product. The main body member 20 includes a base portion 21 having a substantially oval disk shape when viewed from the front, a front-side projecting portion 22a having a substantially oval shape when viewed from the front and projecting from the central region of the front surface 21a of the base portion 21, and a rear surface of the base portion 21. 21b and has a rear-side protruding portion 22b that is substantially oval in a front view and protrudes from the central region of 21b.

The main body member 20 is provided with a terminal block side bus bar 30 (plate member) made of a conductive metal material (copper in this embodiment). The terminal block-side bus bar 30 has a strip-like shape and penetrates through the base portion 21 of the main body member 20, the front-side projecting portion 22a, and the rear-side projecting portion 22b. The main body member 20 of the present embodiment is an insert-molded product formed by performing injection molding with the terminal block-side bus bar 30 arranged in a mold (not shown). The first end portion 31 of the terminal block side bus bar 30 is exposed inside the case 1 from the tip of the rear side projecting portion 22b, and the second end portion 32 of the terminal block side bus bar 30 is exposed from the front end projecting portion 22a. It is exposed outside the case 1 from the tip (see FIG. 3). A first end portion 31 of the terminal block side bus bar 30 is provided with a circular first through hole 33 penetrating through the first end portion 31 in the thickness direction. The portion 32 is provided with a circular second through hole 34 that penetrates the second end portion 32 in the thickness direction.

As shown in FIGS. 3 and 4, the body member 20 is provided with a groove portion 23 that opens at the rear surface 21b of the base portion 21. As shown in FIGS. The groove portion 23 has an oval ring shape when viewed from the rear, and is formed so as to surround the terminal block side bus bar 30 . An O-ring 24 is inserted into the groove portion 23 . The O-ring 24 is an annular member assembled to the main body member 20 and made of an elastic material such as rubber.

As shown in FIGS. 1, 2, and 4, the base portion 21 of the main body member 20 is provided with a pair of screw insertion holes 25 positioned opposite to each other with the terminal block side bus bar 30 interposed therebetween. In this embodiment, a cylindrical collar 25 a is embedded in the body member 20 , and the inner peripheral surface of the collar 25 a serves as the inner peripheral surface of the screw insertion hole 25 . Here, while the back-side protruding portion 22b of the body member 20 is inserted into the through hole 3a of the case 1, the body member 20 is arranged on the outer surface 2a of the side wall 2 of the case 1, and formed by the embedded collar 25a. A screw 26 is inserted into each of the screw insertion holes 25, and the tip of the inserted screw 26 is screwed into the screw hole 3b of the side wall 2. As shown in FIG. As a result, the terminal block 10 is attached to the side wall 2 of the case 1 .

As shown in FIG. 3, a case-side bus bar 40 (plate-like terminal) is arranged in the case 1 and has a strip-like shape and is made of a conductive metal material (copper in this embodiment). A circular through-hole 42 is provided in the end portion 41 of the case-side bus bar 40 so as to pass through the end portion 41 in the thickness direction.

As shown in FIGS. 3 and 4, the terminal block side bus bar 30 and the case side bus bar 40 are partially overlapped when viewed from the thickness direction, and the bolt 61 as the fastening member is screwed into the nut 62. are fastened together. The bolt 61 and nut 62 of this embodiment are made of metal materials such as iron, stainless steel, copper, copper alloys (such as brass), aluminum, and titanium.

As shown in FIGS. 5 and 6, the entire surface of the case-side bus bar 40 is formed with a plating layer 51 that is a metal film. In the present embodiment, for convenience of explanation, the plating layer 51 is shown as a single layer, but actually there are a plurality of plating layers, and the outermost layer is a plating layer of tin (Sn) alone. there is

As shown in FIGS. 5 to 7, the portion of the surface of the case-side bus bar 40 that is in contact with the region including the edge portion 35 of the terminal block-side bus bar 30 is a pressure contact portion 43 with which the terminal block-side bus bar 30 is pressed. It has become. A whisker accommodating space 36 for accommodating the whisker 53 generated at the pressure contact portion 43 is formed in the terminal block side bus bar 30 . The whisker accommodation space 36 opens at the rear surface 30a of the terminal block side bus bar 30 and has a substantially semicircular cross-sectional shape (see FIGS. 5 and 6). The whisker accommodation space 36 has an annular shape when viewed from the rear surface 30a side, and is arranged so as to surround the first through hole 33 (see FIG. 7). Further, the whisker accommodation space 36 is arranged radially outside the bolt 61 from the fastening portion of the bolt 61, specifically speaking, radially outside the bolt 61 relative to the pressure contact portion 43 with the pressure contact portion 43 as a starting point. .

The whisker accommodation space 36 is preferably large enough to prevent the whisker 53 having a length of 0.2 mm or more from scattering outside. As shown in FIG. 6, in the present embodiment, the depth D1 of the whisker accommodation space 36 is 10% or more and 90% or less of the thickness T1 of the region of the terminal block side bus bar 30 that contacts the pressure contact portion 43. there is

As shown in FIGS. 5 and 6 , the terminal block-side bus bar 30 is formed with a projection 37 projecting from the bottom 36 a of the whisker accommodation space 36 toward the case-side bus bar 40 . The convex portion 37 is arranged radially outward of the bolt 61 from the whisker accommodation space 36 in the terminal block side bus bar 30 . In the present embodiment, as a result of forming the whisker accommodation space 36 in the terminal block side bus bar 30 , the remaining area outside the whisker accommodation space 36 in the radial direction of the bolt 61 in the terminal block side bus bar 30 becomes the convex portion 37 . In the terminal block side bus bar 30, the thickness T2 of the formation region of the convex portion 37 is equal to the thickness T1 of the region in contact with the pressure contact portion 43 (in other words, the region radially inside the bolt 61 from the pressure contact portion 43). is smaller than Note that before the bolts 61 and the nuts 62 are fastened, the tip surface 38 of the projection 37 is on the surface of the case-side bus bar 40 (specifically, the surface of the plating layer 51 formed on the surface of the bus bar 40). surface).

Next, a method for forming and mounting the terminal block 10 and a method for connecting the terminal block-side bus bar 30 and the case-side bus bar 40 will be described.

First, the terminal board side bus bar 30 and the case side bus bar 40 are formed by punching a conductive plate material (copper plate in this embodiment) by press working. When the terminal block side bus bar 30 is formed, the first through hole 33, the second through hole 34 and the whisker accommodating space 36 are also formed. Further, when the case-side bus bar 40 is formed, the through holes 42 are also formed. The terminal block side bus bar 30 and the case side bus bar 40 may be formed by cutting the conductive plate instead of pressing the conductive plate.

Next, an upper mold and a lower mold constituting a mold (not shown) for molding the body member 20 are opened, and insert members such as the terminal block side bus bar 30 and the collar 25a are set in the lower mold. do. Then, the upper mold and the lower mold are closed to form a cavity for molding the body member 20 . Next, a molten thermoplastic resin is filled into the cavity through a gate portion (not shown) provided on either the upper die or the lower die. Furthermore, by cooling and solidifying the thermoplastic resin, the thermoplastic resin becomes the main body member 20 that constitutes the terminal block 10 . After that, by opening the upper mold and the lower mold, it is possible to obtain the main body member 20 in which the terminal block side bus bar 30 is embedded.

Next, the O-ring 24 is inserted into the groove portion 23 of the body member 20 in which the terminal block side bus bar 30 is embedded. Furthermore, while inserting the back side projecting portion 22b of the body member 20 into the through hole 3a provided in the side wall 2 of the case 1, the back side 21b of the base portion 21 constituting the body member 20 is pushed onto the outer surface 2a of the side wall 2. abut. Screws 26 are respectively inserted into the pair of screw insertion holes 25 provided in the base 21 , and the tip portions of the inserted screws 26 are screwed into the screw holes 3 b of the side wall 2 . As a result, terminal block 10 is attached to side wall 2 .

Further, the terminal block-side bus bar 30 and the case-side bus bar 40 are fastened using bolts 61 and nuts 62 . Specifically, first, with the terminal block 10 attached to the side wall 2 , the first end portion 31 of the terminal block side bus bar 30 projecting from the inner surface 2 b (see FIG. 3 ) of the side wall 2 is attached to the case side bus bar 40 . is placed on the end 41 of the . Then, the shaft portion 61 a of the bolt 61 is inserted into the first through hole 33 of the terminal block side bus bar 30 and the through hole 42 of the case side bus bar 40 , and the tip of the inserted shaft portion 61 a is inserted into the screw hole 62 a of the nut 62 . (See FIGS. 3 and 8). At this point, the tip surface 38 of the projection 37 is separated from the surface of the plating layer 51 formed on the surface of the case-side bus bar 40 . After that, the bolt 61 is tightened.

As the shaft portion 61a of the bolt 61 is screwed into the screw hole 62a of the nut 62, the area of the terminal block side bus bar 30 that contacts the plating layer 51 (in other words, the pressure contact portion 43 of the terminal block side bus bar 30 is (region located radially inward of the bolt 61) bites into the case-side bus bar 40 side (see FIG. 9). At this point, the terminal block side bus bar 30 and the case side bus bar 40 are fastened to each other.

Further, as the bolt 61 is screwed, the convex portion 37 of the terminal block side bus bar 30 moves toward the case side bus bar 40 side. Then, at the same time as the tightening (screwing) of the bolt 61 is completed, the tip surface 38 of the convex portion 37 comes into contact with the surface of the plating layer 51 formed on the surface of the case-side bus bar 40 (see FIG. 9). As a result, the projections 37 contact the plated layer 51 with a force that is much smaller than the force with which the terminal block-side busbars 30 bite into the case-side busbars 40 , so that the projections 37 exert a large stress on the plating layer 51 . does not work. Moreover, even if environmental changes such as temperature changes and vibrations occur, the possibility that the convex portions 37 strongly press the plating layer 51 is extremely low.

By the way, when the bolt 61 is screwed onto the nut 62 , stress acts on the contact area of the case-side bus bar 40 with which the terminal block-side bus bar 30 contacts. Along with this, the tin plating of the plating layer 51 in the contact area is pushed out to the outside of the contact area and raised. Certain whiskers 53 (see FIGS. 5, 6 and 9) can occur. Since the whisker 53 is a whisker-like (needle-like) tin single crystal, it is likely to break and fall off due to vibration or the like. Especially when the length of the whisker 53 is 0.2 mm or more, the dropped whisker 53 may adhere to a circuit board (not shown) and cause an electrical failure such as a short circuit.

However, in this embodiment, the fallen whisker 53 is accommodated in the whisker accommodation space 36 , and the opening of the whisker accommodation space 36 is blocked by the protrusion 37 coming into contact with the plating layer 51 . As a result, the whisker accommodation space 36 becomes a closed space, so the scattering of the whisker 53 outside the whisker accommodation space 36 is prevented. Therefore, it is possible to prevent the occurrence of electrical failures due to adhesion of the whiskers 53 to the circuit board.

Therefore, according to this embodiment, the following effects can be obtained.

(1) In the present embodiment, since the opening of the whisker accommodation space 36 is narrowed by the protrusion 37, even if the whisker 53 breaks, the whisker accommodation space 36 is blocked by the protrusion 37 and the whisker accommodation space 36 is closed. stay inside. Therefore, scattering of the whiskers 53 outside the whisker accommodation space 36 can be prevented.

(2) In the terminal block side bus bar 30 of the present embodiment, when the bolt 61 is fastened, the area located radially inside the bolt 61 with respect to the pressure contact portion 43 bites into the case side bus bar 40 side, causing the convex portion 37 to move. abuts on the plating layer 51 . Therefore, the convex portion 37 contacts the plating layer 51 with a force smaller than the force with which the terminal block side bus bar 30 bites into the case side bus bar 40 side. As a result, it becomes difficult for stress to concentrate on the contact portion between the convex portion 37 and the case-side bus bar 40 , so that the generation of the whisker 53 near the convex portion 37 can be prevented.

In addition, you may change the said embodiment as follows.

In the above-described embodiment, the region of the terminal block side bus bar 30 that is positioned radially inward of the bolt 61 relative to the pressure contact portion 43 when tightened by the bolt 61 is bitten into the case side bus bar 40, and the tip surface 38 of the convex portion 37 is was brought into contact with the plating layer 51 (see FIG. 9). However, the tip surface 38 of the protrusion 37 does not have to contact the plating layer 51 . In this case, the distance A1 (see FIG. 6) between the tip surface 38 of the protrusion 37 and the surface of the plating layer 51 is preferably 0.5 mm or less, more preferably 0.2 mm or less, so that the whisker accommodation space 36 The whiskers 53 inside are less likely to scatter to the outside.

- As shown in FIG. 10, a case-side bus bar 71 (plate-shaped terminal) is formed with a recess 73 partially including a whisker accommodation space 72, and a terminal block-side bus bar 74 (plate-shaped member) is provided with a recess 73 inside the recess 73. You may form the convex part 75 which protrudes toward. On the contrary, the terminal block-side bus bar may be formed with a concave part having a whisker accommodation space, and the case-side bus bar may be formed with a convex part projecting into the concave part.

In the terminal block side bus bar 30 of the above-described embodiment, the depth D1 (see FIG. 6) of the whisker accommodation space 36 is 10% or more and 90% or less of the thickness T1 of the region in contact with the press contact portion 43 . However, as shown in the terminal block side bus bar 81 (plate-shaped member) in FIG. It may be made substantially the same as the thickness T3 of the region in contact with the pressure contact portion 83 . According to this configuration, the thickness T5 of the formation region of the whisker accommodation space 82 in the terminal block side bus bar 81 is reduced. As a result, the fastening force of the bolt 61 is absorbed by the deformation of the terminal block side bus bar 81 in the region where the whisker accommodation space 82 is formed (see the two-dot chain line portion in FIG. 11), and is less likely to be transmitted to the convex portion 84 side. . As a result, stress is less likely to act on the contact portion between the convex portion 84 and the case-side bus bar 85 (plate-like terminal), so that the generation of the whisker 86 near the convex portion 84 can be prevented.

- In the above embodiment, the whisker accommodating space 36 is formed in the terminal block side bus bar 30 . However, the whisker accommodation space may be formed in the case-side bus bar 40 on the lower side, or the whisker accommodation space may be formed in both the terminal block-side bus bar 30 and the case-side bus bar 40 .

- Although the whisker accommodation space 36 of the above-described embodiment has a substantially semicircular cross-sectional shape, it may have another shape such as a rectangular cross-sectional shape or a triangular cross-sectional shape.

- In the above-described embodiment, the terminal block-side bus bar 30 is formed with the convex portion 37 . However, the lower case-side bus bar 40 may be formed with a convex portion, or both the terminal block-side bus bar 30 and the case-side bus bar 40 may be formed with convex portions.

As shown in FIG. 12, by bending the terminal block side bus bar 91 (plate-shaped member), the terminal block side bus bar 91 has a recessed whisker accommodation space 92 and a case side bus bar 93 (plate-shaped terminal) side. You may form the convex part 94 which protrudes to.

- In the above-described embodiment, potting (resin) may be applied to the portion where the whisker 53 is generated (here, the raised portion 52). By doing so, there is a possibility that the generation of the whiskers 53 can be suppressed.

The plating layer 51 may include a plating layer made of a metal material other than tin (for example, gold, silver, copper, platinum, zinc, titanium, nickel, cobalt, chromium, etc.) or an alloy such as a tin alloy. . Further, when plating layer 51 includes a tin plating layer, a nickel plating layer may be arranged between the tin plating layer and case-side bus bar 40 . By doing so, the corrosion resistance of the case-side bus bar 40 can be improved.

- In the above embodiment, the plating layer 51 was used as a metal film, but a film formation method other than plating, specifically sputtering, chemical vapor deposition (CVD), vacuum deposition, thermal spraying, ion plating, etc. You may use the metal film formed by applying the method of. In addition, it is also possible to form a metal film by a method of applying a liquid material containing a metal by a roll coating method, a spray coating method, a curtain coating method, a method of printing the liquid material, or the like.

- In the above embodiment, a plating layer may be formed on the surface of the terminal block side bus bar 30 . The types of plating that form the plating layer include tin (Sn) plating, nickel (Ni) plating, gold (Au) plating, silver (Ag) plating, tin-silver (Sn—Ag) plating, and the like. can be done.

- In the above-described embodiment, copper is used as the metal material forming the case-side bus bar 40, but other materials such as a copper alloy (such as brass) or aluminum may be used as the metal material.

- In the above-described embodiment, copper is used as the metal material forming the terminal block side bus bar 30, but other materials such as copper alloys (such as brass) and aluminum may be used as the metal material. materials may be used.

- In the above embodiment, the bolt 61 is provided as a fastening member for fastening the terminal block side bus bar 30 and the case side bus bar 40 together. However, other members such as caulking fittings and rivets may be used as fastening members. Further, although the bolt 61 in the above embodiment is made of metal material, the bolt may be made of resin material such as polyvinyl chloride, polycarbonate resin, polyacetal resin, ABS resin, or the like. Further, the bolt may be tightened with a washer or the like sandwiched between the bolt and the terminal-side bus bar 30 .

- In the above embodiment, the terminal block 10 is attached to the outer surface 2a of one side wall 2 of the case 1, but the terminal block 10 may be attached to the inner surface 2b of the side wall 2.

Next, in addition to the technical ideas described in the claims, technical ideas grasped by the above-described embodiments are listed below.

(1) In claim 2 or 3, the distance between the tip surface of the projection and the surface of the metal film formed on the surface of the plate-like terminal is 0 mm or more and 0.5 mm or less. According to this configuration, since the distance between the tip surface of the projection and the surface of the metal film is 0.5 mm or less, the whiskers in the whisker accommodation space are less likely to scatter to the outside through the gap.
(2) In claim 2, in the plate-shaped member, the depth of the whisker accommodation space is 10% or more and 90% or less of the thickness of the region in contact with the pressure contact portion.
(3) In any one of claims 1 to 5, the metal film is composed of a plurality of plating layers including a tin plating layer.

30, 74, 81, 91... terminal block side bus bar 35 as a plate-like member... edge portions 36, 72, 82, 92... whisker accommodating spaces 37, 75, 84, 94... convex parts 40, 71, 85, 93 Case-side busbars 43, 83 as plate-like terminals 51 Plating layers as metal films 53, 86 Whiskers 61 Bolts 73 Concaves T1, T3 as plate-like members Thicknesses T2, T4 of the regions contacting the portions, thicknesses of regions where the convex portions are formed on the plate-like member

Claims (5)

A plate-like terminal made of a metal material and having a metal film formed on its surface; a plate-like member arranged on the plate-like terminal; A terminal connection structure including a fastening member that fastens a plate-like member,
a portion on the surface of the plate-like terminal that is in contact with a region including an edge portion of the plate-like member is a pressure contact portion with which the plate-like member is pressed;
At least one of the plate-like terminal and the plate-like member is formed with a recessed whisker accommodation space for accommodating whiskers generated at the pressure contact portion, and the whisker accommodation space extends from the pressure contact portion as a starting point toward the pressure contact portion. arranged radially outward of the fastening member,
A connection of a terminal, wherein a projection is formed on at least one of the plate-shaped terminal and the plate-shaped member, and the projection is arranged radially outward of the fastening member relative to the whisker accommodating space. structure. The whisker accommodation space is formed on the plate member side,
2. The terminal connection according to claim 1, wherein the convex portion projecting toward the plate-like terminal is arranged radially outward of the fastening member from the whisker accommodating space in the plate-like member. structure. 3. The terminal connection structure according to claim 2, wherein the plate-like member has a thickness of a region in which the projection is formed and a thickness of a region in contact with the pressure contact portion. One of the plate-like terminal and the plate-like member is formed with a concave portion partially containing the whisker accommodating space, and the other is formed with the convex portion projecting into the concave portion. The terminal connection structure according to claim 1. 5. The terminal connection structure according to claim 1, wherein the whisker accommodation space is arranged radially outside of the fastening member from the fastening portion of the fastening member.

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