Power distribution device

Abstract

Disclosed is a power distribution device capable of realizing switching between a series connection state and a parallel connection state of two batteries and miniaturization of the whole device. A power distribution device (10) is provided with: a first relay (30) connected to a first negative side line (28) of a first circuit (20); a second relay (34) connected to a second positive side line (32) of the second circuit (26); a third circuit (36) that connects a first negative side line (28) upstream of the first relay (30) and a second positive side line (32) upstream of the second relay (34); a third relay (38) connected to the third circuit (36); a front-side connection section (42) that connects the first front-side line (40) and the second front-side line (32) in parallel on the downstream side of the second relay (34); a negative-side connection unit (46) that connects the first negative-side line (28) and the second negative-side line (44) in parallel on the downstream side of the first relay (30); and a positive-side output unit (48) and a negative-side output unit (50) that are connected to the downstream sides of the positive-side connection unit (42) and the negative-side connection unit (46), respectively.

Description

Technical Field

[0001] This disclosure relates to power distribution equipment. Background Technology

[0002] Patent document 1 discloses a battery pack for vehicles, comprising a first battery and a second battery consisting of multiple battery groups. In a battery pack with two batteries, if the connection state of these two batteries can be switched to either a parallel connection or a series connection, the versatility and convenience of the battery pack's applications can be improved. Therefore, a power distribution device for switching the connection state of the two batteries is under investigation. Existing technical documents Patent documents

[0003] Patent document 1: International Publication No. 2011 / 104792. Summary of the Invention The problem that the invention aims to solve

[0004] However, when constructing a power distribution device for switching two batteries between series and parallel connections, in addition to the relays connected to the positive wires of each battery, an additional relay is needed to connect to the negative wire of one battery, and further additional relays are required to switch the energization and de-energization between the negative wire of one battery and the positive wire of the other. Therefore, an increase in the number of components and the accompanying increase in the size of the power distribution device are inevitable.

[0005] Therefore, a power distribution device is disclosed that enables switching between two batteries in series and parallel and miniaturizes the entire device. Methods for solving problems

[0006] The power distribution device disclosed herein includes: a first circuit having a first positive input section and a first negative input section connected to a first battery; a second circuit having a second positive input section and a second negative input section connected to a second battery; a first relay connected to a first negative line of the first circuit; a second relay connected to a second positive line of the second circuit; a third circuit connecting the first negative line upstream of the first relay and the second positive line upstream of the second relay; a third relay connected to the third circuit; a positive connection section connecting the first positive line and the second positive line in parallel downstream of the second relay; a negative connection section connecting the first negative line and the second negative line in parallel downstream of the first relay; and a positive output section and a negative output section connected to the downstream side of each of the positive connection section and the negative connection section. Invention Effects

[0007] According to this disclosure, a power distribution device can be provided that enables switching between two batteries in series and parallel and miniaturizes the overall device. Attached Figure Description

[0008] Figure 1 This is a perspective view showing the power distribution device according to Embodiment 1. Figure 2 yes Figure 1 A top view of the power distribution equipment shown. Figure 3 It is shown in the state with the lower casing removed. Figure 1 A three-dimensional view of the power distribution equipment shown. Figure 4 yes Figure 1 A perspective view shown from the front side, extracting the components constituting the first circuit, second circuit, and third circuit from the power distribution device shown. Figure 5 yes Figure 4 The diagram shows a perspective view from the rear side of the components constituting the first circuit, the second circuit, and the third circuit. Figure 6 yes Figure 1 The power distribution device shown is a three-dimensional view of a portion of its components in an exploded state. Figure 7 It is shown Figure 1 A perspective view of the connection body formed by the interconnection of the first base component and the second base component in the power distribution device shown. Figure 8 yes Figure 7 A top view of the connection between the first base component and the second base component. Figure 9 It is Figure 8 The longitudinal section view shown is an enlarged view of the main part of section IX-IX. Figure 10 The structure is shown from the left. Figure 1 A perspective view of the first base component of the power distribution device shown. Figure 11 yes Figure 10 The first base component is shown in a perspective view from the right. Figure 12 yes Figure 10 The top view of the first base component shown. Figure 13 It is used for explanation Figure 1 The circuit diagram of the electrical structure of the power distribution device is shown. Figure 14 It is used to illustrate the passage Figure 1 The circuit diagram shown illustrates the state in which the first and second batteries are connected in parallel in the power distribution device. Figure 15 It is used to illustrate the passage Figure 1 The circuit diagram shown illustrates the state in which the first battery and the second battery are connected in series in the power distribution device. Detailed Implementation

[0009] <Description of the embodiments disclosed herein> First, the embodiments of this disclosure will be described in detail. (1) The power distribution device of this disclosure comprises: a first circuit having a first positive input section and a first negative input section connected to a first battery; a second circuit having a second positive input section and a second negative input section connected to a second battery; a first relay connected to a first negative line of the first circuit; a second relay connected to a second positive line of the second circuit; a third circuit connecting the first negative line upstream of the first relay and the second positive line upstream of the second relay; a third relay connected to the third circuit; a positive connection section connecting the first positive line and the second positive line in parallel on the downstream side of the second relay; a negative connection section connecting the first negative line and the second negative line in parallel on the downstream side of the first relay; and a positive output section and a negative output section connected to the downstream side of each of the positive connection section and the negative connection section.

[0010] According to the power distribution device disclosed herein, by setting a first relay connected to the first negative line of the first circuit and a second relay connected to the second positive line of the second circuit to be on, and setting a third relay to be off, a first battery and a second battery can be connected in parallel. Furthermore, by setting the first and second relays to be off and the third relay to be on, a first battery and a second battery can be connected in series, thereby obtaining a higher voltage output from the positive and negative output sections than when connected in parallel. Moreover, the third relay is provided in a third circuit that connects the first negative line upstream of the first relay and the second positive line upstream of the second relay. Therefore, switching between series and parallel connections of the two batteries can be performed using only three relays, enabling miniaturization with fewer components. Furthermore, the third circuit containing the third relay can be space-efficiently arranged between the first and second relays, thereby achieving overall device miniaturization.

[0011] (2) In (1) above, preferably, it includes: a first current sensor connected to the first positive side line of the first circuit, and a second current sensor connected to the second negative side line of the second circuit. Downstream of the first current sensor, the positive side connection portion is connected to the first positive side line, and downstream of the second current sensor, the negative side connection portion is connected to the second negative side line. The first current sensor is connected to the first positive side line not connected to the first relay, and the second current sensor is connected to the second negative side line not connected to the second relay. Thus, the space on the line not connected to the relay can be cleverly utilized to set up the first and second current sensors. Through the space-efficient configuration of the first / second relays and the first / second current sensors, the overall miniaturization of the device can be further achieved.

[0012] Furthermore, the first current sensor and the second current sensor are connected to the first positive line and the second negative line upstream of the positive connection and the negative connection. Therefore, using only the first current sensor and the second current sensor, the current state can be stably measured in both series and parallel connections. In particular, by placing the first current sensor and the second current sensor upstream of the positive connection and the negative connection, the space efficiency of the first current sensor and the second current sensor is well achieved, without being limited by the positive and negative output sections located downstream.

[0013] (3) In (1) or (2) above, preferably, a fuse is provided that is connected in series with the third relay of the third circuit, and the arrangement area of ​​the third relay and the arrangement area of ​​the fuse overlap in the mounting direction of the third relay. Since the third circuit is equipped with a fuse connected in series with the third relay, when an overcurrent accidentally flows when the third relay is turned on, the fuse can cut off the third circuit, thereby preventing damage to the battery and downstream equipment. Furthermore, since the arrangement area of ​​the third relay and the arrangement area of ​​the fuse overlap in the mounting direction of the third relay (e.g., the vertical direction), it is possible to suppress the enlargement of the device in the width direction (e.g., the horizontal direction) that intersects with the mounting direction.

[0014] (4) In (2) above, preferably, it includes: a first base component that mounts the first circuit and a second base component that mounts the second circuit. The first base component and the second base component each include a relay mounting part, a current sensor mounting part and an additional mounting part. By combining the first base component and the second base component, a third circuit mounting part is formed by connecting each of the additional mounting parts. The third circuit is mounted on the third circuit mounting part.

[0015] By combining a first base component carrying a first circuit with a second base component carrying a second circuit, a third circuit mounting section carrying a third circuit is constructed. Therefore, no new base component is needed, and with a smaller number of parts, a mounting area for the third circuit, used for switching between series / parallel connections between a first battery connected to the first circuit and a second battery connected to the second circuit, can be secured. Furthermore, since the third circuit mounting section can be constructed using the space (additional mounting section) of the first / second base components carrying the first / second circuits, it can be used similarly even when the third circuit is not required, providing a highly versatile power distribution device.

[0016] (5) In (4) above, preferably, a fuse is provided that is connected in series with the third relay of the third circuit. The third circuit mounting part includes: a fuse mounting part for mounting the fuse; and a third relay mounting part, which is configured to include the fuse mounting part and its surroundings in the mounting direction of the fuse, for mounting the third relay. The third relay mounted on the third relay mounting part overlaps with the fuse in the mounting direction of the third relay. The fuse mounting part and the third relay mounting part in the third circuit mounting part can overlap in the mounting direction of the third relay, i.e., the plate thickness direction of each base component, which enables the miniaturization of the power distribution device and ensures the third circuit mounting part for the third circuit that performs series / parallel switching between the first battery and the second battery.

[0017] (6) In (4) or (5) above, preferably, the first base component and the second base component have the same shape, and the additional mounting portion is disposed on one end side of the length direction of each base component. The width dimension of the additional mounting portion is smaller than the width dimension of the other end side of the length direction of each base component, and the additional mounting portion is disposed biased towards one side of the width direction. On the inner edge of the additional mounting portion in the width direction, a fitting portion with a polygonal cross-section is provided on the one end side of the length direction, and a fitting hole with the same cross-sectional shape as the fitting portion is provided on the other end side of the length direction for the fitting portion to fit into. By fitting the fitting portion and the fitting hole of the second base component, whose arrangement direction is rotated by 180° relative to the arrangement direction of the first base component around the central axis of the plate thickness direction, with the fitting hole and the fitting portion of the first base component, the first base component and the second base component are assembled to form the third circuit mounting portion connected by each additional mounting portion.

[0018] Since the first base component and the second base component are of the same shape, the same base components can be used, thereby reducing manufacturing costs and simplifying parts management. Moreover, when assembling the first base component and the second base component, it is only necessary to rotate their orientation by 180° and fit the polygonal cross-section fitting parts and fitting holes provided on each base component to each other, which simplifies the assembly operation; the rotational displacement between the first base component and the second base component after assembly can also be reliably prevented by the fitting of the polygonal cross-section fitting parts and fitting holes.

[0019] (7) In (6) above, preferably, the outer peripheral surface of each base component is provided with a locking protrusion and a locking recess. When the first base component and the second base component are assembled, the locking protrusion and the locking recess engage, thereby restricting the separation of the first base component and the second base component. By providing locking protrusions and locking recesses on the outer peripheral surfaces of base components of the same shape, separation in the assembly direction can be prevented when assembling the first base component and the second base component. Thus, the assembled state of the first base component and the second base component can be stably maintained without increasing the number of parts.

[0020] <Details of the embodiments disclosed> Specific examples of the power distribution apparatus of this disclosure are described below with reference to the accompanying drawings. It should be noted that this disclosure is not limited to these examples, but is defined by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0021] <Implementation Method 1> The following uses Figures 1 to 15 The power distribution device 10 according to Embodiment 1 of this disclosure will be described. The power distribution device 10 is, for example, installed in an electric vehicle or a hybrid vehicle, and includes circuits for various known auxiliary devices (not shown), from the power source to the electric power steering system, electric parking brake, lighting, wiper drive unit, navigation device, air conditioning, etc. In particular, the power distribution device 10 of Embodiment 1 is also as... Figure 13 As shown, it is configured to connect to the first battery 12 and the second battery 14, which serve as power sources, and the connection state of the first battery 12 and the second battery 14 is switched between a series connection state and a parallel connection state via the power distribution device 10. Furthermore, the power distribution device 10 can be configured in any orientation, but hereinafter, Figure 9 The upper part of the middle is used as the upper part. Figure 9 The bottom of the middle is used as the bottom. Figure 2 The bottom of the middle is used as the front. Figure 2 The upper part of the middle is used as the rear. Figure 2 The left side in the middle is the left side. Figure 2The right side is used for description. Additionally, for multiple identical parts, sometimes only some parts are labeled with reference numerals, while the reference numerals are omitted for the remaining parts.

[0022] <Power Distribution Equipment 10> First, combine Figure 4 , Figure 5 and Figure 13 The electrical structure of the power distribution device 10 will be described below. The power distribution device 10 includes: a first circuit 20 having a first positive input section 16 and a first negative input section 18 connected to a first battery 12; and a second circuit 26 having a second positive input section 22 and a second negative input section 24 connected to a second battery 14. A first relay 30 is connected to the first negative line 28 of the first circuit 20, and a second relay 34 is connected to the second positive line 32 of the second circuit 26.

[0023] Furthermore, the first negative line 28 upstream of the first relay 30 and the second positive line 32 upstream of the second relay 34 are connected via a third circuit 36. A third relay 38 is connected to the third circuit 36. Downstream of the second relay 34, the first positive line 40 and the second positive line 32 are connected in parallel via a positive connection portion 42, and downstream of the first relay 30, the first negative line 28 and the second negative line 44 are connected in parallel via a negative connection portion 46. The power distribution device 10 includes a positive output portion 48 and a negative output portion 50 connected downstream of each of these positive connection portions 42 and negative connection portions 46.

[0024] Here, in the first positive side line 40, the first negative side line 28, the second positive side line 32, and the second negative side line 44, the upstream side refers to the side where the first positive side input section 16, the first negative side input section 18, the second positive side input section 22, and the second negative side input section 24 are connected to the first battery 12 and the second battery 14. Furthermore, the downstream side refers to the side where the positive side output section 48 and the negative side output section 50 are connected to a load (auxiliary equipment) not shown.

[0025] It is important to note that Figure 13 The circuit diagram shows that the first relay 30, the second relay 34, and the third relay 38 are all disconnected, and no power is being supplied to the power distribution device 10 from the first battery 12 and the second battery 14. Additionally, Figure 14 In the circuit diagram shown, the first relay 30 and the second relay 34 are on, and the third relay 38 is off. To easily illustrate that the third circuit 36 ​​is not energized, it is represented by a double-dotted line. Furthermore, Figure 15In the circuit diagram shown, the first relay 30 and the second relay 34 are in the off state and the third relay 38 is in the on state. To make it easier to understand that a part of the first circuit 20 and the second circuit 26 are not energized, a double-dotted line is used to indicate a part of the first circuit 20 and the second circuit 26.

[0026] The components constituting the electrical circuit in the power distribution device 10 are not limited, but in Embodiment 1, the first battery 12 and the second battery 14 are both known 48V batteries. In addition, the first relay 30 connected in the first circuit 20, the second relay 34 connected in the second circuit 26, and the third relay 38 connected in the third circuit 36 ​​are all known mechanical relays.

[0027] The first positive line 40 and the first negative line 28 are power lines connected to the positive and negative terminals of the first battery 12, respectively. The first circuit 20 is configured to include the first positive line 40, the first negative line 28, the first relay 30, and the first current sensor 52 (described later). Furthermore, the second positive line 32 and the second negative line 44 are power lines connected to the positive and negative terminals of the second battery 14, respectively. The second circuit 26 is configured to include the second positive line 32, the second negative line 44, the second relay 34, and the second current sensor 54 (described later).

[0028] In particular, in Embodiment 1, a first current sensor 52 is connected to the first positive side line 40 of the first circuit 20, and a second current sensor 54 is connected to the second negative side line 44 of the second circuit 26. Furthermore, downstream of the first current sensor 52, the aforementioned positive side connection portion 42 is connected to the first positive side line 40, and downstream of the second current sensor 54, the aforementioned negative side connection portion 46 is connected to the second negative side line 44.

[0029] Furthermore, a fuse 56 is connected in series with the third relay 38 in the third circuit 36. Specifically, the fuse 56 is provided in the third circuit 36 ​​that connects the first negative line 28 upstream of the first relay 30 to the second positive line 32 upstream of the second relay 34. In Embodiment 1, the fuse 56 is provided on the side closer to the first negative line 28 than the third relay 38.

[0030] Here, in the electrical circuit within the power distribution unit 10, the first positive line 40, first negative line 28, second positive line 32, and second negative line 44, which connect the first relay 30, second relay 34, third relay 38, first current sensor 52, second current sensor 54, and fuse 56, can be constructed from conductive components. They can be made of wires, for example, but in Embodiment 1, they are constructed from multiple busbars (hereinafter, busbars 58a to 58n).

[0031] That is, such as Figures 1 to 5 As shown, the power distribution device 10 has a busbar 58a with a first positive input section 16. A double-ended bolt is press-fitted to one end (rear end) of the busbar 58a, protruding upwards, and this upward-protruding double-ended bolt constitutes the first positive input section 16. The busbar 58a forms the first positive line 40, and a first current sensor 52 is connected to the busbar 58a. A busbar 58b is connected downstream of the first current sensor 52; in addition to the busbar 58a, the busbar 58b also constitutes the first positive line 40.

[0032] Furthermore, the power distribution unit 10 has a busbar 58c with a first negative input section 18. A double-ended bolt is press-fitted to one end (rear end) of the busbar 58c, protruding upwards, and this upward-protruding double-ended bolt constitutes the first negative input section 18. The busbar 58c forms the first negative line 28, and a first relay 30 is connected to the busbar 58c. A busbar 58d is connected downstream of the first relay 30; in addition to the busbar 58c, the busbar 58d also constitutes the first negative line 28.

[0033] In the first negative line 28, a busbar 58e is connected and branches out upstream of the first relay 30 (busbar 58c). This busbar 58e is connected to the fuse 56 via busbar 58f. The fuse 56 is connected in series with the third relay 38 via busbar 58g, and the third relay 38 is connected to busbar 58h. This busbar 58h is connected to the second positive line 32 upstream of the second relay 34 (busbar 58i, described later). Therefore, the third circuit 36 ​​is configured to include the third relay 38, the fuse 56, and busbars 58e, 58f, 58g, and 58h.

[0034] Furthermore, the power distribution unit 10 has a busbar 58i with a second positive input section 22. A double-ended bolt is press-fitted to one end (rear end) of the busbar 58i, protruding upwards, and this upward-protruding double-ended bolt constitutes the second positive input section 22. The busbar 58i constitutes the second positive line 32, and a second relay 34 is connected to the busbar 58i. Downstream of the second relay 34, a busbar 58j is connected; in addition to the busbar 58i, the busbar 58j also constitutes the second positive line 32.

[0035] Furthermore, the power distribution unit 10 has a busbar 58k with a second negative input section 24. A double-ended bolt is press-fitted to one end (rear end) of the busbar 58k along its length, protruding upwards, and this upward-protruding double-ended bolt constitutes the second negative input section 24. The busbar 58k forms the second negative line 44, and a second current sensor 54 is connected to the busbar 58k. A busbar 58l is connected downstream of the second current sensor 54; in addition to the busbar 58k, the busbar 58l also constitutes the second negative line 44.

[0036] Here, downstream of the second relay 34, the first positive line 40 (busbar 58b) and the second positive line 32 (busbar 58j) are connected in parallel via busbar 58m, which constitutes the positive connection portion 42. Busbar 58m is a long busbar extending in the left-right direction within the power distribution device 10, and busbars 58b and 58j are connected to the two ends (left-right ends) of busbar 58m in the length direction. Each busbar 58b and 58j can be fixedly connected to busbar 58m, for example, by bolts, but in embodiment 1, each busbar 58b, 58j, and 58m is integrally formed.

[0037] A forward extension 60 is integrally provided at the lower end of the busbar 58m, extending forward. In Embodiment 1, the four forward extensions 60 are arranged approximately equally spaced apart from each other in the left-right direction. A positive-side external connection busbar 64 constituting the positive-side output section 48 is connected to the extension end (front end) of each forward extension 60 via a fuse 62, so that the positive-side (positive-side) input section of the load (auxiliary equipment) (not shown) is connected to each positive-side external connection busbar 64. It should be noted that... Figures 13 to 15 Only one output unit 48 on the positive side is shown, but Figures 13 to 15 In order to make the electrical structure of the power distribution device 10 easy to understand, in fact, there are four positive output sections 48 that are branched down from the positive connection section 42.

[0038] Furthermore, downstream of the first relay 30, the first negative line 28 (busbar 58d) and the second negative line 44 (busbar 58l) are connected in parallel via busbar 58n, which constitutes the negative connection portion 46. Busbar 58n is a relatively long busbar extending in the left-right direction within the power distribution device 10. Busbars 58d and 58l are connected to the two ends (left-right ends) of busbar 58n in the length direction. These busbars 58d and 58l can be fixedly connected to busbar 58n, for example, by bolts, but in Embodiment 1, each busbar 58d, 58l, and 58n is integrally formed. Busbar 58n is separate from the aforementioned busbar 58m in the front-rear direction and extends substantially parallel to each other. In Embodiment 1, busbar 58m is located forward of busbar 58n.

[0039] A negative-side external connection busbar 66 extending forward to form a negative-side output section 50 is connected to the upper end of busbar 58n. The negative-side external connection busbar 66 can be fixedly connected to busbar 58n, for example, by bolts, but in Embodiment 1, the negative-side external connection busbar 66 is integrally formed with busbar 58n. In Embodiment 1, the four negative-side external connection busbars 66 are spaced approximately equally in the left-right direction, so that the input section of the negative terminal side (negative side) of the load (auxiliary equipment) (not shown) is connected to each negative-side external connection busbar 66. It should be noted that... Figures 13 to 15 Only one output unit 50 on the negative side is shown, but Figures 13 to 15 In order to make the electrical structure of the power distribution device 10 easy to understand, in fact, there are four negative output sections 50, which are provided downstream of the negative connection section 46.

[0040] <First base component 68 and second base component 70> Also Figures 6 to 9 As shown, the power distribution device 10 includes a first base component 68 carrying a first circuit 20 and a second base component 70 carrying a second circuit 26. It should be noted that... Figures 6 to 9 The illustrations of busbars 58a-58n, the positive-side external connection busbar 64 and the negative-side external connection busbar 66, and the connecting and fixing bolts are omitted. Furthermore, Figures 6 to 9 In the figure, the first base component 68 and the second base component 70 are shown in a state where they are connected to each other in the left-right direction to form a connecting body 72. In Embodiment 1, the first base component 68 is located on the left and the second base component 70 is located on the right. In particular, in Embodiment 1, the first base component 68 and the second base component 70 have the same shape. Therefore, the shape of the first base component 68 will be described below, and the detailed description of the second base component 70 will be omitted by using the same reference numerals as the first base component 68 in the figure.

[0041] Also Figures 10 to 12 As shown, the first base component 68 includes: a relay mounting section 74, which mounts the first relay 30 in the first circuit 20; a current sensor mounting section 76, which mounts the first current sensor 52 in the first circuit 20; and an additional mounting section 78. That is, in the second base component 70, the relay mounting section 74 mounts the second relay 34 in the second circuit 26, and the current sensor mounting section 76 mounts the second current sensor 54 in the second circuit 26. Furthermore, the second base component 70 includes the additional mounting section 78.

[0042] Specifically, the first base component 68 is generally rectangular in shape and is formed of an insulating material such as synthetic resin. Also, Figure 6 As shown, the first base component 68 is fixed to the lower housing 112, which will be described later, with its length direction being left-right. That is, the left-right dimension of the first base component 68 is greater than its front-back dimension. In the first base component 68 (and the second base component 70), the length direction refers to the left-right direction, and the width direction refers to the front-back direction.

[0043] Furthermore, a relay mounting portion 74, which is approximately rectangular when viewed from above, is provided in the middle portion of the first base component 68 along its length (left side), and a current sensor mounting portion 76, which is approximately rectangular when viewed from above, is provided at the other end (left side) along the length. Additionally, an additional mounting portion 78, which is approximately rectangular when viewed from above, is provided at one end (right side) along the length of the first base component 68. The relay mounting portion 74 and the current sensor mounting portion 76 are respectively configured as upwardly opening recesses formed by the surrounding walls protruding upward relative to the bottoms 74a and 76a on which the first relay 30 and the first current sensor 52 are mounted.

[0044] It should be noted that in the first base component 68, a plurality of nuts 80 are provided around the relay mounting portion 74 and the current sensor mounting portion 76 for bolting the first relay 30, the first current sensor 52, the busbar constituting the first circuit 20, etc., relative to the first base component 68. Furthermore, a plurality of feet 82 are provided circumferentially separated on the outer periphery of the first base component 68, and the first base component 68 is bolted relative to the lower housing 112 (described later) by bolts inserted into each foot 82.

[0045] <Additional Mounting Unit 78> The additional mounting portion 78 has a width (front-to-back dimension) smaller than that of the first base member 68 in the longitudinal direction, particularly smaller than that of the relay mounting portion 74 adjacent to the other end (left side) of the additional mounting portion 78 in the longitudinal direction. The additional mounting portion 78 is positioned relative to the relay mounting portion 74, biased towards one side (rear side) in the width direction. In other words, in the rear portion of the relay mounting portion 74, the additional mounting portion 78, with a width (front-to-back dimension) smaller than that of the relay mounting portion 74, extends towards one end (right side) in the longitudinal direction. Similar to the relay mounting portion 74 and the current sensor mounting portion 76, the additional mounting portion 78 has a recess formed by causing the surrounding wall portion to protrude upward relative to the bottom 83. Also as... Figure 10 , Figure 11 As shown, the walls surrounding the recess are mainly provided on three sides (rear and left and right sides) except for the front, and the recess provided on the additional mounting part 78 has a front opening 84.

[0046] In Embodiment 1, a stepped portion 86 is provided at the center of the bottom 83 in the left-right direction and at the front portion of the recess in the additional mounting portion 78. Therefore, the center of the bottom 83 in the left-right direction and the front portion are positioned lower in the vertical direction than other portions of the bottom 83 (for example, see reference...). Figure 9 The second base component 70 shown has an additional mounting portion 78. That is, the bottom 83 is configured to include: a first bottom 83a at a lower position, and a second bottom 83b located above the first bottom 83a via a step portion 86 around the first bottom 83a.

[0047] Furthermore, as described below, by combining the first base component 68 and the second base component 70, and connecting the additional mounting portions 78 to each other, a third circuit mounting portion 106 for mounting the third circuit 36 ​​is formed. That is, the third circuit mounting portion 106 mounts the third relay 38 and the fuse 56 constituting the third circuit 36, and the third circuit mounting portion 106 is configured to include: a third relay mounting portion 110 for mounting the third relay 38 and a fuse mounting portion 108 for mounting the fuse 56.

[0048] Furthermore, as described below, the fuse mounting portion 108 is constructed by connecting the recess containing the first bottom 83a in the first base member 68 and the recess containing the first bottom 83a in the second base member 70 in the front-rear direction. In short, the recess containing the first bottom 83a in the first base member 68 cooperates with the recess containing the first bottom 83a in the second base member 70 to form the fuse mounting portion half-segment 88 of the fuse mounting portion 108. Similarly, the third relay mounting portion 110 is constructed by connecting the recess containing the second bottom 83b in the first base member 68 and the recess containing the second bottom 83b in the second base member 70 in the front-rear direction. In short, the recess containing the second bottom 83b in the first base member 68 cooperates with the recess containing the second bottom 83b in the second base member 70 to form the third relay mounting portion half-segment 90 of the third relay mounting portion 110.

[0049] Furthermore, at the inner edge of the additional mounting portion 78 in the width direction (front-rear direction), i.e., at the other end (front end) in the width direction, a fitting portion 92 with a polygonal cross-section is provided on one end side (right end side) in the length direction. Moreover, at the other end (front end) in the width direction (front-rear direction) of the additional mounting portion 78, a fitting hole 94 with the same cross-sectional shape as the fitting portion 92 is provided on the other end side (left end side) in the length direction, for the fitting portion 92 to fit into. In Embodiment 1, as... Figure 12 As shown, the fitting part 92 and the fitting hole 94 are both rectangular when viewed from above.

[0050] Furthermore, when assembling the first base component 68 and the second base component 70, the right end face of the outer peripheral surface of the first base component 68, which is an overlapping surface, is particularly important. Figure 9 , Figure 11 As shown, a locking protrusion 96 and a locking recess 98 are provided that fit together. Specifically, the right end face of the first base component 68 is composed of the right end face of the additional mounting portion 78 and the right end face of the portion of the relay mounting portion 74 where the additional mounting portion 78 is not provided (the front portion of the relay mounting portion 74). The right end face of the additional mounting portion 78 has a locking protrusion 96 that protrudes to the right, and the right end face of the front portion of the relay mounting portion 74 has a locking recess 98 that opens to the right.

[0051] In implementation method 1, as well as Figure 9As shown, the longitudinal section of the locking protrusion 96 is trapezoidal, especially in Embodiment 1, where it is an isosceles trapezoid. Thus, the upper and lower surfaces of the locking protrusion 96 are inclined surfaces 96a, 96a that gradually approach each other as they move towards the protrusion direction (to the right). Furthermore, a pair of trapezoidal protrusions 100, 100 separated in the vertical direction are provided on the right end face of the front portion of the relay mounting portion 74, and a locking recess 98 is formed between these trapezoidal protrusions 100, 100 in the vertical direction, recessed relative to each trapezoidal protrusion 100. The longitudinal section of each trapezoidal protrusion 100 is the same isosceles trapezoid as that of the locking protrusion 96. Therefore, the upper and lower surfaces of the inner surface of the locking recess 98 are inclined surfaces 98a and 98a that gradually separate towards the right, and the upper and lower outer surfaces of each trapezoidal protrusion 100 that constitute the upper and lower sides of the locking recess 98 are inclined surfaces 100a and 100a that gradually approach each other towards the right.

[0052] By setting the locking protrusion 96 and locking recess 98 (each trapezoidal protrusion 100) to the shape described above, as explained below, the locking protrusion 96 can be inserted into the locking recess 98 from either above or below, utilizing the guiding effect of the inclined surfaces 96a and 100a. Furthermore, when the first base component 68 and the second base component 70 are assembled, the locking protrusion 96 and the locking recess 98 engage, with each inclined surface 96a of the locking protrusion 96 abutting against each inclined surface 98a of the locking recess 98. Thus, the displacement of the first base component 68 and the second base component 70 in the disengagement direction (i.e., the vertical direction that is the assembly direction of the first base component 68 and the second base component 70) is limited to a certain extent.

[0053] In addition, such as Figure 11 , Figure 12 As shown, on the right end face of the additional mounting portion 78, a pair of hook-shaped protrusions 102, 102 having an L-shaped cross-section and extending in the vertical direction are provided on both sides of the locking protrusion 96 in the front-rear direction. Each hook-shaped protrusion 102 protrudes to the right from the right end face of the additional mounting portion 78. Furthermore, on the right end face of the front portion of the relay mounting portion 74, a pair of hook-shaped recesses 104, 104 having the same L-shaped cross-section as the hook-shaped protrusions 102 and extending in the vertical direction are provided on both sides of the locking recess 98 and each trapezoidal protrusion 100 in the front-rear direction. Each hook-shaped recess 104 opens to the right from the right end face of the front portion of the relay mounting portion 74, allowing each hook-shaped protrusion 102 to be inserted into each hook-shaped recess 104 from above or below.

[0054] <Connector 72> As mentioned above, the first base component 68 and the second base component 70 are combined to form a structure as shown in the figure. Figures 6 to 9The connecting body 72 is shown. In Embodiment 1, the first base component 68 and the second base component 70 have the same shape, and the second base component 70 is formed by rotating the first base component 68 by 180° about the central axis in the plate thickness direction (vertical direction). Figure 12 The second base component 70, formed by rotating the first base component 68 180° around its central axis in the vertical direction, is shown by a double-dotted line. The first base component 68 and the second base component 70 cannot be assembled even when brought close together in the left-right or front-back directions due to interference from the fitting parts 92, locking protrusions 96, and hook-shaped protrusions 102. However, they can be assembled when brought close together in the vertical direction.

[0055] That is, by bringing the first base component 68 and the second base component 70 closer together from above and below, they are inserted into their respective fitting holes 94 and hook-shaped recesses 104, thus engaging the fitting portions 92 and hook-shaped protrusions 102 of the other. Furthermore, each locking protrusion 96 is inserted into and engaged in the locking recess 98 from above or below, passing over the trapezoidal protrusion 100 of the other. Thus, the first base component 68 and the second base component 70 are combined, but this is a temporary fixation. The engagement is released by separating the first base component 68 and the second base component 70 from above and below. The formal fixation of the first base component 68 and the second base component 70 is achieved by placing the fuse 56 on the fuse mounting portion 108 (described later) and bolting the fuse 56 to the first base component 68 and the second base component 70. In short, the first base component 68 and the second base component 70 are formally fixed by being bolted together with the fuse 56 in between. It should be noted that since each hook-shaped protrusion 102 and each hook-shaped recess 104 are corresponding hooks to each other, the first base component 68 and the second base component 70 can be prevented from separating in the left and right direction by the interlocking of each hook-shaped protrusion 102 and each hook-shaped recess 104.

[0056] Here, by combining the first base component 68 and the second base component 70, the additional mounting portion 78 of the first base component 68 and the additional mounting portion 78 of the second base component 70 are connected to each other by their front openings 84, 84. Furthermore, by connecting these additional mounting portions 78, a third circuit mounting portion 106 for mounting the third circuit 36 ​​is formed.

[0057] Specifically, in the connecting body 72 formed by the first base component 68 and the second base component 70, the recesses of each additional mounting portion 78 are connected to each other. As mentioned above, the recesses of the additional mounting portions 78 include: a fuse mounting portion half-segment 88 including a first bottom 83a, and a third relay mounting portion half-segment 90 including a second bottom 83b. Furthermore, as... Figure 8As shown, each additional mounting portion 78 is connected in the front-to-back direction, thereby connecting each fuse mounting portion half-segment 88 in the front-to-back direction to form an upwardly opening fuse mounting portion 108. Furthermore, each third relay mounting portion half-segment 90 is connected in the front-to-back direction to form an upwardly opening third relay mounting portion 110. Thus, the third circuit mounting portion 106 is configured to include the fuse mounting portion 108 and the third relay mounting portion 110. The third relay mounting portion 110 is formed above the fuse mounting portion 108.

[0058] exist Figure 9 In the diagram, a fuse 56 mounted on a fuse mounting portion 108 and a third relay 38 mounted on a third relay mounting portion 110 are shown with double-dotted lines. The fuse 56 is mounted on the fuse mounting portion 108 from above and secured with bolts. Similarly, the third relay 38 is mounted on the third relay mounting portion 110 from above and secured with bolts. Therefore, in Embodiment 1, the third relay mounting portion 110 is constructed including the fuse mounting portion 108 and its surrounding area in the projection of the fuse 56 in the mounting direction (vertical direction). In other words, the arrangement area of ​​the third relay 38 overlaps with the arrangement area of ​​the fuse 56 in the mounting direction (vertical direction) of the third relay 38. As a result, the third relay 38 mounted on the third relay mounting portion 110 overlaps with the fuse 56 in the mounting direction (vertical direction) of the third relay 38. It should be noted that the configuration area of ​​the third relay 38 (third relay mounting part 110) and the configuration area of ​​the fuse 56 (fuse mounting part 108) do not need to completely overlap in the vertical direction projection; partial overlap is sufficient.

[0059] <Lower housing 112 and bracket 122> The aforementioned connector 72, which houses the first circuit 20, the second circuit 26, and the third circuit 36, is fixed to the upward-opening lower housing 112. For example... Figure 1 , Figure 6As shown, the lower housing 112 is a box-shaped structure that opens upwards and is made of an insulating material such as synthetic resin. The lower housing 112 has a bottom wall 114 and an annular peripheral wall 116 protruding upwards from the bottom wall 114. The front portion of the peripheral wall 116 is provided with a through hole 118, through which wires, busbars, etc. (not shown) on the load (auxiliary) side are inserted into the interior of the lower housing 112 and connected to the positive external connection busbar 64 and the negative external connection busbar 66. In Embodiment 1, corresponding to each positive external connection busbar 64 and negative external connection busbar 66, the four through holes 118 are separated from each other in the left-right direction and are arranged at approximately equal intervals in the front portion of the peripheral wall 116. In addition, a flange-shaped portion 120 is provided at the upper end of the peripheral wall 116, which is widened outward in an annular shape. The double-headed bolts that constitute the first positive input portion 16, the first negative input portion 18, the second positive input portion 22 and the second negative input portion 24 are mounted on the flange-shaped portion 120 and protrude upward.

[0060] Furthermore, each busbar 58m and 58n constituting the downstream portion of the first circuit 20 and the second circuit 26 is supported by a bracket 122 provided within the lower housing 112. The bracket 122 is a long component extending in the left-right direction within the lower housing 112, and is formed of an insulating material such as synthetic resin. Specifically, on the bracket 122, a front groove 124 and a rear groove 126 extending in the left-right direction are respectively provided separately in the front-back direction. The busbar 58m is inserted into and supported in the front groove 124, and the busbar 58n is inserted into and supported in the rear groove 126. Moreover, a fuse fixing part 128 for fixing the fuse 62 connected to the front extension 60 is integrally provided at the front portion of the bracket 122. In Embodiment 1, four fuse fixing parts 128 are provided separately in the left-right direction for each fuse 62. The bracket 122 is fixed to the bottom wall 114 of the lower housing 112 by bolts.

[0061] <Assembly method of power distribution device 10> The following will describe a specific example of the assembly method of the power distribution device 10. However, the assembly method of the power distribution device 10 is not limited to the description below.

[0062] First, a first base component 68 and a second base component 70 are prepared. In Embodiment 1, since the first base component 68 and the second base component 70 have the same shape, two first base components 68 are prepared. One of them is rotated 180° around its vertical central axis to complete the preparation of the first base component 68 and the second base component 70. Next, the first base component 68 and the second base component 70 are brought closer together from their vertically facing positions. Each fitting portion 92 is inserted into each fitting hole 94, and each hook-shaped protrusion 102 is inserted into each hook-shaped recess 104. Furthermore, the inclined surfaces 96a of each locking protrusion 96 abut against the inclined surfaces 100a of each trapezoidal protrusion 100, causing each locking protrusion 96 and / or each trapezoidal protrusion 100 to elastically deform, allowing each locking protrusion 96 to pass over each trapezoidal protrusion 100 and engage with each locking recess 98. Thus, the first base component 68 and the second base component 70 are temporarily fixed together to form a connecting body 72.

[0063] Subsequently, the first base component 68 and the second base component 70 are formally fixed by bolting the temporarily fixed connector 72 to the bottom wall 114 of the lower housing 112 and bolting the fuse 56 to the fuse mounting part 108. It should be noted that the bolting of the fuse 56 in the fuse mounting part 108 can be performed before fixing the connector 72 to the bottom wall 114 of the lower housing 112, or the bolting of the formally fixed connector 72 to the bottom wall 114 of the lower housing 112 can be performed. Furthermore, the bracket 122 is fixed to the bottom wall 114 of the lower housing 112 by bolts. Furthermore, in an appropriate order, the first to third relays 30, 34, and 38 constituting the first to third circuits 20, 26, and 36, the first and second current sensors 52 and 54, the busbars 58a to 58n, each fuse 62, and the positive and negative external connection busbars 64 and 66 are mounted on the connector 72 and the bracket 122, and each is fixed with bolts. Thus, the power distribution device 10 of Embodiment 1 is completed. In addition, the upper housing (not shown) can be superimposed on the lower housing 112 of the power distribution device 10 from above, and the upper housing can also cover the upper opening of the lower housing 112.

[0064] In the power distribution device 10 manufactured as described above, by setting the first relay 30 and the second relay 34 to be on and the third relay 38 to be off, a system is formed. Figure 14 The electrical structure shown. That is, in Figure 14In the shown configuration, the first positive line 40 from the first battery 12 and the second positive line 32 from the second battery 14 are connected in parallel at the positive connection portion 42. Furthermore, the first negative line 28 from the first battery 12 and the second negative line 44 from the second battery 14 are connected in parallel at the negative connection portion 46. Thus, a voltage of 48V, the same as that of the first battery 12 and the second battery 14, is applied to each load (auxiliary device) connected to the positive output portion 48 and the negative output portion 50.

[0065] In addition, the first relay 30 and the second relay 34 are set to open, and the third relay 38 is set to close, thereby forming Figure 15 The electrical structure shown. That is, in Figure 15 In the shown configuration, the first negative line 28 and the second positive line 32 are connected in series via the third circuit 36. Thus, the first battery 12 and the second battery 14 are connected in series, and the first positive line 40 from the first battery 12 is connected to each load (auxiliary device) via the positive output section 48, while the second negative line 44 from the second battery 14 is connected to each load (auxiliary device) via the negative output section 50. As a result, a voltage of 96V, calculated by combining the voltages of the first battery 12 and the second battery 14, is applied to each load (auxiliary device) connected to the positive output section 48 and the negative output section 50.

[0066] Therefore, if an electrical structure like that of Embodiment 1 is adopted, switching between the first battery 12 and the second battery 14 in series and parallel configuration can be achieved by selecting the on / off state of the three relays 30, 34, and 38. In particular, if a first relay and a second relay are respectively installed on the first positive line and the second positive line to achieve the switching function between the first battery and the second battery in series and parallel configuration as disclosed herein, the number of additional relays increases, potentially increasing cost and size. In contrast, Embodiment 1 employs a method of installing a first relay 30 on the first negative line 28 and a second relay 34 on the second positive line 32. Thus, by using a third circuit 36 ​​including the third relay 38 to connect the first negative line 28 upstream of the first relay 30 and the second positive line 32 upstream of the second relay 34, switching between the first battery 12 and the second battery 14 in series and parallel configuration can be achieved. Therefore, in Embodiment 1, by adding one relay (third relay 38) to the basic structure having the first relay 30 and the second relay 34, the switching mechanism between the series connection of the first battery 12 and the second battery 14 can be realized, thus avoiding excessive increase in cost and size.

[0067] Furthermore, the power distribution device 10 is configured such that a first current sensor 52 is connected to the first positive line 40 of the first circuit 20, and a second current sensor 54 is connected to the second negative line 44 of the second circuit 26. Thus, as... Figure 14 , Figure 15 As shown, even when the first battery 12 and the second battery 14 are connected in either series or parallel, the current value can be obtained from the first positive line 40 and the second negative line 44, thereby enabling higher precision monitoring of the current value.

[0068] The third circuit 36 ​​includes a third relay 38 and a fuse 56 connected in series with the third relay 38. The mounting area of ​​the third relay 38 (third relay mounting portion 110) and the mounting area of ​​the fuse 56 (fuse mounting portion 108) overlap vertically. Therefore, compared to the case where the mounting areas of the third relay 38 and the fuse 56 are independently arranged when viewed from above, the planar shape of the power distribution device 10 is reduced, enabling miniaturization of the power distribution device 10. In particular, when the first battery 12 and the second battery 14 are connected in series, the third circuit 36 ​​is energized and thus subjected to a large voltage. However, in this case, if an excessive voltage is accidentally applied, the fuse 56 is tripped, thereby preventing damage to the equipment in the circuit.

[0069] The power distribution device 10 includes a first base component 68 mounting a first circuit 20 and a second base component 70 mounting a second circuit 26, and each of the first base component 68 and the second base component 70 has an additional mounting portion 78. Furthermore, by combining the first base component 68 and the second base component 70 and connecting their respective additional mounting portions 78 to each other, a third circuit mounting portion 106 for mounting the third circuit 36 ​​is formed. That is, there is no need to separately provide a base component for mounting the third circuit 36, thus avoiding an increase in the number of components.

[0070] In particular, the aforementioned third circuit mounting section 106 includes a fuse mounting section 108 and a third relay mounting section 110, with the fuse 56 mounted in the fuse mounting section 108 and the third relay 38 mounted in the third relay mounting section 110 overlapping vertically. That is, the fuse 56 and the third relay 38 overlap vertically, and the fuse mounting section 108 and the third relay mounting section 110 that mount them are configured by combining the first base member 68 and the second base member 70. Therefore, miniaturization of the power distribution device 10 and reduction of the number of parts can be achieved simultaneously.

[0071] In Embodiment 1, the first base component 68 and the second base component 70 have the same shape, and each base component 68, 70 has a mating portion 92 and a mating hole 94 that fit together. Since the first base component 68 and the second base component 70 have the same shape, it is possible to prevent an increase in the types of parts, thereby reducing costs and the time required for parts management. Furthermore, by fitting each mating portion 92 into each mating hole 94, the first base component 68 and the second base component 70 can be temporarily fixed. For example, when fixing the fuse 56 and the third relay 38 across the first base component 68 and the second base component 70, it is possible to prevent the first base component 68 and the second base component 70 from accidentally separating.

[0072] Specifically, the first base component 68 and the second base component 70 are each provided with a locking protrusion 96 and a locking recess 98 that engage with each other, which can prevent them from disengaging when assembling the first base component 68 and the second base component 70. Therefore, when fixing the fuse 56 and the third relay 38 across the first base component 68 and the second base component 70, accidental separation of the first base component 68 and the second base component 70 can be more reliably prevented.

[0073] <Variation Example> The above description, as a specific example of this disclosure, details Embodiment 1, but this disclosure is not limited to this specific description. Modifications and improvements within the scope of achieving the objectives of this disclosure are all included in this disclosure. For example, the following modifications of the embodiments are also included within the technical scope of this disclosure.

[0074] (1) In the above embodiment, the first current sensor 52 is connected to the first positive line 40 of the first circuit 20, and the second current sensor 54 is connected to the second negative line 44 of the second circuit 26, but the location of the current sensors is not limited. In addition, in the power distribution device involved in this disclosure, current sensors may not be provided.

[0075] (2) In the above embodiment, the power distribution device 10 has a first base component 68 and a second base component 70 with the same shape, but is not limited to this arrangement. For example, the first base component and the second base component may also have different shapes. In addition, in the above embodiment, the fuse mounting portion 108 and the third relay mounting portion 110 overlap in the vertical direction, and the fuse 56 is located below the third relay 38, but is not limited to this arrangement. That is, for example, one of the first base component and the second base component may have a fuse mounting portion, and the other of the first base component and the second base component may have a third relay mounting portion. Furthermore, in the power distribution device involved in this disclosure, the number of base components is not limited to two (the first base component and the second base component), and may be one, three or more. That is, the power distribution device involved in this disclosure may have one base component for mounting the first to third circuits, or may have three base components for mounting the first to third circuits separately. Furthermore, in the power distribution device involved in this disclosure, the fuse connected in series with the third relay is not necessary.

[0076] (3) In the above embodiment, the fitting part 92 and the fitting hole 94 are rectangular when viewed from above, but for example, they may also be circular when viewed from above. In addition, the fitting part and the fitting hole do not need to be set to corresponding shapes. For example, the fitting part may be rectangular and the fitting hole may be circular when viewed from above, or the fitting part may be circular and the fitting hole may be rectangular when viewed from above.

[0077] (4) In the power distribution device disclosed herein, the fitting part and fitting hole, the locking protrusion and locking recess, and the hook-shaped protrusion and hook-shaped recess are not essential. In the above embodiment, the first base component 68 and the second base component 70 are combined in the vertical direction, but are not limited to this method. For example, the first base component and the second base component can also be combined with each other in the horizontal direction or the front-back direction. In this case, the fuse and the third relay can be fixed across the first base component and the second base component; and in this case, the first base component and the second base component can also be temporarily fixed before fixing the fuse and the third relay. The mechanism for temporarily fixing the first base component and the second base component is not limited, and in addition to the concave-convex fitting as in the above embodiment, it can also be achieved by pressing or any locking mechanism.

[0078] (5) The shapes of each busbar 58a-58n, lower housing 112, and bracket 122 in the above embodiments are not limited and can be any shape. In addition, the voltage of the first battery and the second battery is not limited to 48V and can be set arbitrarily. Symbol Explanation

[0079] 10 Power Distribution Equipment

[0080] 12 First Battery

[0081] 14 Second Battery

[0082] 16 First Positive Side Input Section

[0083] 18 First Negative Input Section

[0084] 20 First Circuit

[0085] 22 Second positive side input section

[0086] 24 Second Negative Input Section

[0087] 26 Second Circuit

[0088] 28 First negative sideline

[0089] 30 First Relay

[0090] 32 Second lateral line

[0091] 34 Second Relay

[0092] 36 Third Circuit

[0093] 38 Third Relay

[0094] 40 First lateral line

[0095] 42 Front and side connection parts

[0096] 44 Second Negative Sideline

[0097] 46 Negative side connection part

[0098] 48 Positive side output section

[0099] 50 Negative-side output section

[0100] 52 First Current Sensor

[0101] 54 Second Current Sensor

[0102] 56 fuses

[0103] 58a~58n busbars

[0104] 60 front extension

[0105] 62 fuse

[0106] 64. Busbar for external connection on the front and side

[0107] 66 External connection busbar on the negative side

[0108] 68 First base component

[0109] 70 Second base component

[0110] 72 Connectors

[0111] 74 Relay Mounting Unit

[0112] 74a bottom

[0113] 76 Current Sensor Mounting Unit

[0114] 76a bottom

[0115] 78 additional mounting units

[0116] 80 nuts

[0117] 82 feet

[0118] 83 bottom

[0119] 83a First Bottom

[0120] 83b Second Bottom

[0121] 84 Front opening

[0122] 86 steps

[0123] 88 fuse mounting section half-segment

[0124] 90 Third Relay Mounting Part Half-Divided Section

[0125] 92 Chimera Department

[0126] 94 fitting holes

[0127] 96 locking convex part

[0128] 96a inclined surface

[0129] 98 locking recess

[0130] 98a inclined surface

[0131] 100 trapezoidal protrusions

[0132] 100a inclined plane

[0133] 102 hook-shaped protrusion

[0134] 104 hook-shaped recess

[0135] 106 Third Circuit Mounting Unit

[0136] 108 Fuse Mounting Unit

[0137] 110 Third Relay Mounting Unit

[0138] 112 Lower Housing

[0139] 114 bottom wall

[0140] 116 Zhoubi

[0141] 118 through-hole

[0142] 120 flange-like portion

[0143] 122 bracket

[0144] 124 front groove

[0145] 126 rear side groove

[0146] 128 Fuse fixing part.

Claims

1. A power distribution device, comprising: A first circuit having a first positive input section and a first negative input section connected to a first battery; A second circuit having a second positive input section and a second negative input section connected to a second battery; A first relay connected to the first negative side line of the first circuit; The second relay connected to the second positive side line of the second circuit; A third circuit that connects the first negative line upstream of the first relay to the second positive line upstream of the second relay; The third relay connected to the third circuit; A positive side connection portion that connects the first positive side line and the second positive side line in parallel on the downstream side of the second relay; A negative-side connection portion downstream of the first relay that connects the first negative-side line and the second negative-side line in parallel; and The positive output section and the negative output section are connected to the downstream side of the positive connection section and the negative connection section, respectively.

2. The power distribution device according to claim 1, wherein, The power distribution device includes: The first current sensor connected to the first positive side line of the first circuit; and The second current sensor is connected to the second negative side line of the second circuit. Downstream of the first current sensor, the positive side connection portion is connected to the first positive side line. Downstream of the second current sensor, the negative side connection is connected to the second negative side line.

3. The power distribution device according to claim 1 or 2, wherein, The power distribution device includes: a fuse of the third relay connected in series in the third circuit. The configuration area of ​​the third relay overlaps with the configuration area of ​​the fuse in the mounting direction of the third relay.

4. The power distribution device according to claim 2, wherein, The power distribution device includes: The first base component carrying the first circuit; and The second base component that carries the second circuit. The first base component and the second base component each include a relay mounting part, a current sensor mounting part, and an additional mounting part. By combining the first base component and the second base component, a third circuit mounting unit is formed by connecting each of the additional mounting units. The third circuit is mounted on the third circuit mounting part.

5. The power distribution device according to claim 4, wherein, The power distribution device includes: a fuse of the third relay connected in series in the third circuit. The third circuit mounting unit includes: Fuse mounting section for mounting the fuse; and A third relay mounting section is configured including the fuse mounting section and its surrounding area in the fuse mounting direction, for mounting the third relay. The third relay mounted on the third relay mounting part overlaps with the fuse in the mounting direction of the third relay.

6. The power distribution device according to claim 4 or 5, wherein, The first base component and the second base component have the same shape. The additional mounting portion is disposed at one end of each of the base components along its length direction. The width of the additional mounting portion is smaller than the width of the other end of each of the base components along its length direction, and the additional mounting portion is disposed biased towards one side in the width direction. The inner square edge of the additional mounting portion in the width direction has a polygonal cross-section fitting portion at one end in the length direction, and a fitting hole with the same cross-sectional shape as the fitting portion is provided at the other end in the length direction for the fitting portion to fit into. By engaging the fitting portion and the fitting hole of the second base component, whose configuration direction is rotated 180° relative to the configuration direction of the first base component around the central axis of the plate thickness direction, with the fitting hole and the fitting portion of the first base component, the first base component and the second base component are assembled to form the third circuit mounting part that connects each of the additional mounting parts.

7. The power distribution device according to claim 6, wherein, Each of the base components has a locking protrusion and a locking recess on its outer peripheral surface. When the first base component and the second base component are assembled, the locking protrusion and the locking recess engage, thereby preventing the first base component from disengaging from the second base component.

Images