123 by for example screws for screwing. The second insulative housing 125 is formed with a second mating groove 127 which extends along the up-down direction D3, the second mating groove 127 penetrates the second insulative housing 125 and an upper end and a lower end of the second mating groove 127 are in form of opened shape. The insulative housing 125 has two second side portions 128 which are spaced apart from each other along the left-right direction D2. In the present embodiment, each second side portion 128 takes an oblique surface as an example. Certainly, each second side portion 128 also may be other shape but is not limited to the oblique surface. The two second side portions 128 oblique extend inwardly from rear to front, so that a distance between front ends of the two second side portions 128 is smaller than a distance between rear ends of the two second side portions 128. Each second power terminal 126 partially extends into the second mating groove 127.

The first side portion 118 at a right side of each first straddle type connector 114 and the second side portion 128 at a left side of the corresponding second straddle type connector 124 face each other and are spaced apart from each other along the left-right direction D2. A first pitch S1 taken between the front end of the first side portion 118 at the right side and the front end of the second side portion 128 at the left side along the left-right direction D2 is larger than a second pitch S2 taken between the rear end of the first side portion 118 at the right side and the rear end of the second side portion 128 at the left side along the left-right direction D2. The first side portion 118 at the right side of each first straddle type connector 114 and the second side portion 128 at the left side of the corresponding second straddle type connector 124 are formed therebetween with a snapping groove 129.

The plurality of second mounting portions 122 integrally extend upwardly from the rear side of the second body 120 and are arranged and spaced apart from each other along the left-right direction D2. Each second mounting portion 122 is in form of elongated upright plate shape and a length direction of the second mounting portion 122 extends along the up-down direction D3. The plurality of second mounting portions 122 and the plurality of first mounting portions 112 are alternately arranged along the left-right direction D2.

The second body 120, the second base plate 123 and the plurality of second mounting portions 122 of the second busbar 12 are made of a copper material which may carry a high current and has good heat dissipation, the second body 120, the second base plate 123 and the plurality of second mounting portions 122 are formed by a processing, such as stamping and bending.

In order to make that the second body 120 and the first body 110 are constructed therebetween to be insulated from each other and be not conducted with each other, the busbar group 1 of the first embodiment further includes an insulative layer 13 which is provided between the first body 110 and the second body 120, is used to space the first body 110 and the second body 120 apart from each other and avoids the first body 110 and the second body 120 contacting each other and conducting with each other. In the present embodiment, the insulative layer 13 takes an insulative sheet as an example, the insulative layer 13 is adhered between the first body 110 and the second body 120 by for example an insulative adhesive. Certainly, the insulative layer 13 also may be fixed between the first body 110 and the second body 120 by screws for screwing, and is not limited to adhering by the insulative adhesive. The insulative layer 13 also may be constituted by an insulative paint or an insulative adhesive which is coated between the first body 110 and the second body 120, and is not limited to the insulative sheet. That is to say, the insulative layer 13 may be a sheet structural layer constituted by the insulative sheet, also may be the insulative paint or the insulative adhesive constituted by a coating layer.

The plurality of connectors 2 are respectively mounted to the plurality of first mounting portions 112 of the first busbar 11 and the plurality of second mounting portions 122 of the second busbar 12. The corresponding connector 2 which is mounted to each first mounting portion 112 is fixed to a rear plate surface of the first mounting portion 112 by for example screws for screwing. The corresponding connector 2 which is mounted to each second mounting portion 122 is fixed to a rear plate surface of the second mounting portion 122 by for example screws for screwing. The plurality of connectors 2 are used to be electrically connected to a plurality of power supply units (PSU) (not shown) and a plurality of battery backup units (BBU) (not shown) in the server box. In the present embodiment, the first busbar 11 is connected to a positive electrode of each power supply unit or a positive electrode of each battery backup unit by the corresponding connectors 2, and the second busbar 12 is connected to a negative electrode of each power supply unit or a negative electrode of each battery backup unit by the corresponding connectors 2.

Referring to FIG. 2, FIG. 3, FIG. 5 and FIG. 6, the rack busbar group 3 includes a first rack busbar 31, a second rack busbar 32, a first inserting plate 33, a second inserting plate 34, the plurality of first floating modules 35, a plurality of second floating modules 36, a guiding spacer 37, a first engaging assembly 38 and a second engaging assembly 39. The first rack busbar 31 and the second rack busbar 32 are made of a copper material which may carry a high current and has good heat dissipation and are spaced apart from each other along the left-right direction D2. The first rack busbar 31 and the second rack busbar 32 each are in form of long strip shape and length directions of the first rack busbar 31 and the second rack busbar 32 extend along the up-down direction D3. The first inserting plate 33 and the second inserting plate 34 are made of a copper material which may carry a high current and has good heat dissipation, are respectively provided to the first rack busbar 31 and the second rack busbar 32, and are spaced apart from each other along the left-right direction D2. The first inserting plate 33 and the second inserting plate 34 each are in form of upright shape. The first inserting plate 33 partially protrudes from a rear end of the first rack busbar 31, is used to insert into the plurality of inserting grooves 117 of the plurality of first straddle type connectors 114 so as to contact and electrically connect with the power terminals 116. The second inserting plate 34 partially protrudes from a rear end of the second rack busbar 32, is used to insert into the plurality of inserting grooves 127 of the plurality of second straddle type connectors 124 so as to contact and electrically connect with the power terminals 126. Therefore, the first inserting plate 33 and the second inserting plate 34 of the rack busbar group 3 pluggably insert into the plurality of inserting grooves 117 and the plurality of inserting grooves 127 of the busbar group 1 respectively.

The plurality of first floating modules 35 are provided between the first rack busbar 31 and the first inserting plate 33, the plurality of second floating modules 36 are provided between the second rack busbar 32 and the second inserting plate 34. That is to say, in the present embodiment, the first inserting plate 33 is provided to the first rack busbar 31 via the plurality of first floating modules 35, and the second inserting plate 34 is provided to the second rack busbar 32 via the plurality of second floating modules 36. Each first floating module 35 and each second floating module 36 each includes a receptacle 351 and a plug 352. The receptacle 351 and the plug 352 are made of a copper material which may carry a high current and has good heat dissipation. The receptacle 351 of each first floating module 35 is provided to one of the first rack busbar 31 and the first inserting plate 33, the plug 352 of each first floating module 35 is provided to the other of the first rack busbar 31 and the first inserting plate 33. The receptacle 351 of each second floating module 36 is provided to one of the second rack busbar 32 and the second inserting plate 34, the plug 352 of each second floating module 36 is provided to the other of the second rack busbar 32 and the second inserting plate 34. In the present embodiment, that the receptacle 351 and the plug 352 of each first floating module 35 are respectively provided to the first inserting plate 33 and the first rack busbar 31 is taken as an example, but the present disclosure is not limited thereto. That the receptacle 351 and the plug 352 of each second floating module 36 are respectively provided to the second inserting plate 34 and the second rack busbar 32 is taken as an example, but the present disclosure is not limited thereto.

Referring to FIG. 3, FIG. 5, FIG. 7 and FIG. 8, the receptacle 351 includes a seat body 353, a barrel-shaped member 354, two pressing members 355, a contacting member 356 and a fixing ring 357. The seat body 353 is formed with a passageway 358 which extends along the left-right direction D2 between two ends of the seat body 353 and an annular receiving groove 359 which radially extends outwardly from the passageway 358. The barrel-shaped member 354 has a barrel body 360 whose outer diameter is smaller than the passageway 358 and an annular flange 361 which radially extends outwardly from an outer wall surface of the barrel body 360. The annular flange 361 is movably received in the annular receiving groove 359. The two pressing members 355 have elasticity and are provided between the annular flange 361 of the barrel-shaped member 354 and the annular receiving groove 359, so as to make that the barrel-shaped member 354 is capable of floating in the passageway 358. In the present embodiment, each pressing member 355 is a waveform spring annular piece, the two pressing members 355 are respectively provided to two end surfaces of the annular flange 361 in the left-right direction D2, so as to make the barrel-shaped member 354 be capable of radially floating in the passageway 358 in a two-dimensional plane constituted by the front-rear direction D1 and the up-down direction D3 and floating along the left-right direction D2. In other implementing manners of the present embodiment, each pressing member 355 may be other existing elastic members which can be used to apply a pressure, and the pressing member 355 may be one, three or more in number.

The contacting member 356 is provided in the barrel body 360 of the barrel-shaped member 354. The contacting member 356 has an annular head portion 362 which is provided to an inner wall surface of the barrel body 360 and is adjacent to one end edge of the barrel body 360 and a plurality of elastic contacting pieces 363 which obliquely extend inwardly from the annular head portion 362 toward the other end edge of the barrel body 360. The fixing ring 357 and the barrel body 360 of the barrel-shaped member 354 together clamp the annular head portion 362 of the contacting member 356, so as to fix the contacting member 356 in the barrel-shaped member 354. The fixing ring 357 has a clamping portion 364 which is in form of ring shape and clamps the annular head portion 362 together with the inner wall surface of the barrel body 360 and an abutting portion 365 which radially extends outwardly from an end edge of the clamping portion 364 and abuts against the one end edge of the barrel body 360.

The plug 352 has an inserting post 366, the inserting post 611 is used to insert into the barrel-shaped member 354 of the receptacle 351 along the left-right direction D2, so as to contact the plurality of elastic contacting pieces 363 of the contacting member 356. Because the inserting post 366 of the plug 352 inserts into the receptacle 351 along the left-right direction D2 and contacts the contacting member 356, the inserting post 366 of the plug 352 is also capable of floating relative to the contacting member 356 of the receptacle 351 in the left-right direction D2.

By that the plurality of first floating modules 35 are provided between the first rack busbar 31 and the first inserting plate 33, the first rack busbar 31 and the first inserting plate 33 are floatingly connected along the left-right direction D2. By that the plurality of second floating modules 36 are provided between the second rack busbar 32 and the second inserting plate 34, the second rack busbar 32 and the second inserting plate 34 are floatingly connected along the left-right direction D2. Therefore, the first rack busbar 31 and the second rack busbar 32 are capable of floating relative to the first inserting plate 33 and the second inserting plate 34 along the left-right direction D2 respectively.

Referring to FIG. 3, FIG. 5 and FIG. 6, the guiding spacer 37 is fixed between the first inserting plate 33 and the second inserting plate 34, the guiding spacer 37 is configured to space the first inserting plate 33 and the second inserting plate 34 apart from each other and guide the first inserting plate 33 and the second inserting plate 34 to respectively insert into the plurality of inserting grooves 117 of the plurality of first straddle type connectors 114 and the plurality of inserting grooves 127 of the plurality of second straddle type connectors 124. The guiding spacer 37 is in form of block shape and has an engaging block 371 and a guiding block 372 which protrudes rearwardly from the engaging block 371. The engaging block 371 is clamped by the first inserting plate 33 and the second inserting plate 34, is used to securely engage with the first inserting plate 33 and the second inserting plate 34. The engaging block 371 of the present embodiment securely engages with the first inserting plate 33 by means of the first engaging assembly 38, and securely engages with the second inserting plate 34 by means of the second engaging assembly 39. The first engaging assembly 38 includes a plurality of first nuts 381 and a plurality of first bolts 382. The plurality of first bolts 382 pass through the first inserting plate 33 and the engaging block 371 of the guiding spacer 37 and are respectively screwed to the plurality of first nuts 381, so that the first inserting plate 33 and the engaging block 371 of the guiding spacer 37 are locked together. The second engaging assembly 39 includes a plurality of second nuts 391 and a plurality of second bolts 392. The plurality of second nuts 391 pass through the second inserting plate 34 and the engaging block 371 of the guiding spacer 37 and are respectively screwed to the plurality of second nuts 391, so that the second inserting plate 34 and the engaging block 371 of the guiding spacer 37 are locked together. Certainly, the first engaging assembly 38 and the second engaging assembly 39 of the present embodiment also each may be other engaging structure, such as a rivet, an adhesive and the like, may be not limited to structure that a nut and a bolt cooperate with each other.

The guiding block 372 has a first guiding oblique surface 373 and a second guiding oblique surface 374 which are spaced apart from each other along the left-right direction D2. The first guiding oblique surface 373 and the second guiding oblique surface 374 obliquely extend inwardly from front to rear, so that a first distance d1 taken between a front end of the first guiding oblique surface 373 and a front end the second guiding oblique surface 374 along the left-right direction D2 is larger than a second distance d2 taken between a rear end of the first guiding oblique surface 373 and a rear end of the second guiding oblique surface 374 along the left-right direction D2. The first guiding oblique surface 373 is used to contact the corresponding first side portion 118 and is capable of sliding on the corresponding first side portion 118. The second guiding oblique surface 374 is used to contact the corresponding second side portion 128 and is capable of sliding on the corresponding second side portion 128.

Referring to FIG. 3, when the first inserting plate 33 and the second inserting plate 34 of the rack busbar group 3 respectively insert into the plurality of inserting grooves 117 and the plurality of inserting grooves 127 of the busbar group 1, the rack busbar group 3 is moved rearwardly toward the busbar group 1.

Referring to FIG. 9 and FIG. 11, when the first inserting plate 33 and the second inserting plate 34 of the rack busbar group 3 have a position offset to the left in the left-right direction D2 and are not aligned with the plurality of inserting grooves 117 and the plurality of inserting grooves 127 respectively, the first guiding oblique surface 373 of the guiding spacer 37 will first contact the corresponding first side portion 118 and slide on the corresponding first side portion 118, in a process that the guiding spacer 37 slides rearwardly, the guiding spacer 37 will at the same time bring the first inserting plate 33 and the second inserting plate 34 to move rightwardly along the left-right direction D2 so as to guide the first inserting plate 33 and the second inserting plate 34 to be correct in position, so that the first inserting plate 33 and the second inserting plate 34 can be aligned with the plurality of inserting grooves 117 and the plurality of inserting grooves 127 respectively. Therefore, the position offset to the left with respect to the first inserting plate 33 and the second inserting plate 34 in the left-right direction D2 can be overcome, the first inserting plate 33 and the second inserting plate 34 can smoothly insert into the plurality of inserting grooves 117 and the plurality of inserting grooves 127 respectively, and can be electrically connected to the power terminals 116 (as shown in FIG. 2) and the power terminals 126 (as shown in FIG. 2) respectively.

Referring to FIG. 10 and FIG. 11, when the first inserting plate 33 and the second inserting plate 34 of the rack busbar group 3 have a position offset to the right in the left-right direction D2 and are not aligned with the plurality of inserting grooves 117 and the plurality of inserting grooves 127, the second guiding oblique surface 374 of the guiding spacer 37 will first contact the corresponding second side portion 128 and slide on the corresponding second side portion 128, in a process that the guiding spacer 37 slides rearwardly, the guiding spacer 3 will at the same time bring the first inserting plate 33 and the second inserting plate 34 to move leftwardly along the left-right direction D2 so as guide the first inserting plate 33 and the second inserting plate 34 to be correct in position, so that the first inserting plate 33 and the second inserting plate 34 can be aligned with the plurality of inserting grooves 117 and the plurality of inserting grooves 127 respectively. Therefore, the position offset to the right with respect to the first inserting plate 33 and the second inserting plate 34 in the left-right direction D2 can be overcome, the first inserting plate 33 and the second inserting plate 34 can smoothly insert into the plurality of inserting grooves 117 and the plurality of inserting grooves 127 respectively, and can be electrically connected to the power terminals 116 (as shown in FIG. 2) and the power terminals 126 (as shown in FIG. 2) respectively.

Referring to FIG. 9, FIG. 10 and FIG. 11, by that the first side portion 118 and the second side portion 128 each are an oblique surface in design, smoothness that the first guiding oblique surface 373 and the second guiding oblique surface 374 respectively slide on the first side portion 118 and the second side portion 128 can be promoted. Moreover, when the first inserting plate 33 and the second inserting plate 34 respectively insert into the plurality of inserting grooves 117 and the plurality of inserting grooves 127, the guiding block 372 of the guiding spacer 37 are snapped in the snapping groove 129, and the first guiding oblique surface