Power distribution device and transportation device equipped with said power distribution device

Abstract

The power distribution device includes a housing (9), a precharge circuit module, and a main positive circuit module. The housing (9) has an installation chamber. The precharge circuit module is used to precharge a capacitive element in a power consuming device, and includes a precharge relay (8) connected in the housing. The main positive circuit module is attracted to each other after the precharge circuit module is disconnected, and the main positive circuit module and the precharge circuit module are stacked one above the other in the installation chamber, and the main positive circuit module includes a fuse (2) and a main relay core (4), and the main relay core (4) is connected in the housing (9). The utilization rate of the internal space of the power distribution device is high and the cost is low. A traffic transportation device including the power distribution device is further provided.

Description

[Technical field]

[0001] The present disclosure relates to the technical fields of power distribution equipment and traffic transportation equipment, and more particularly to a power distribution equipment and a traffic transportation equipment including the power distribution equipment. [Background technology]

[0002] In the transportation equipment, such as electric vehicles, electric ships, electric rail transport, and aircraft, the use of power distribution devices is very widespread. The power distribution device is mainly composed of a main relay, a precharge relay, an aluminum case resistor, and a resistance wire, which are fixed by tying bands and buckles. The power distribution device configured in the above manner is easy to operate and easy to maintain in the installation manner, but as a modularized product, the attributes of its component products are lacking. On the other hand, the product integration is low and the external size structure is large. The main reason is that the elements inside the module are still independent individuals, and are connected by simple methods such as bolts and buckles, and the harness is fixed by a tying band, so the product integration is low. In addition, the internal elements adopt a tiling method, and the utilization rate of the internal space is not high, so the external size structure is large. On the other hand, the product cost is high, because each element is designed as an independent product, and no related design is performed, which increases the cost. Summary of the Invention [Problem to be solved by the invention]

[0003] The present disclosure aims to solve at least one of the above technical problems, and provides a power distribution device with high utilization rate of internal space and low cost, and a traffic transportation device including the power distribution device. [Means for solving the problem]

[0004] In one aspect, an embodiment of the present disclosure provides a power distribution device, the power distribution device includes a housing, a pre-charge circuit module, and a main positive circuit module. The housing has a mounting chamber. The pre-charge circuit module is used for pre-charging a capacitive element in a power consumption device, the pre-charge circuit module includes a pre-charge relay, and the pre-charge relay is connected in the housing. The main positive circuit module is attracted after the pre-charge circuit module is disconnected, and the main positive circuit module and the pre-charge circuit module are stacked vertically in the mounting chamber, the main positive circuit module includes a fuse and a main relay core, and the main relay core is connected in the housing. The power distribution device has an input end and a first output end, a first end of the fuse is the input end or is connected to the input end, a second end of the fuse is connected to a first end of the main relay core, a second end of the main relay core is the first output end or is connected to the first output end, a first end of the pre-charge circuit module is connected to the input end or the second end of the fuse, and a second end of the pre-charge circuit module is connected to the second end of the main relay core or the first output end.

[0005] Preferably, the pre-charge circuit module further includes a pre-charge resistor, the pre-charge relay and the main relay core are respectively arranged at both ends of the mounting chamber, the fuse and the pre-charge resistor are provided between the pre-charge relay and the main relay core, and the pre-charge resistor is arranged at the bottom of the mounting chamber, and the fuse is located above the pre-charge resistor.

[0006] Preferably, the fuse and the pre-charge resistor are close to the pre-charge relay and the main relay core.

[0007] Preferably, the precharge relay is connected within the housing by a fastening structure or a potting structure, and the main relay core is connected within the housing by a potting structure or a fastening structure.

[0008] Preferably, the housing includes a bottom shell and a face cover, the face cover is connected to the bottom shell by a buckle structure or a locking member to form the mounting chamber, the pre-charge relay is connected to the bottom shell by a fastening structure, and the main relay core is connected to the bottom shell by a potting structure.

[0009] Preferably, a first mounting hole is provided in the face cover at a position corresponding to above the pre-charge relay, a second mounting hole and a third mounting hole are provided in the face cover at positions corresponding to above the main relay core, a mounting window for placing the fuse is provided in the face cover, the pre-charge relay is located below the first mounting hole, a first end of the fuse extends above the first mounting hole, a second end of the fuse extends above the second mounting hole, a first end of the main relay core is located below the second mounting hole, a second end of the main relay core is located below the third mounting hole, and the second end of the fuse is connected to the first end of the main relay core by a first locking member that penetrates the second mounting hole.

[0010] Preferably, the potting structure is formed by solidifying a potting agent.

[0011] Preferably, the power distribution device further has a second output end, the power distribution device includes a connection harness, a first end of the connection harness is insertably connected to the pre-charge relay by a first connection terminal, and a second end of the connection harness is the second output end.

[0012] Preferably, the second end of the connection harness is a connection copper busbar terminal.

[0013] Preferably, the first connection terminal is an insert terminal.

[0014] Preferably, the input terminal is a current input terminal, and the first output terminal and the second output terminal are current outputs.

[0015] Preferably, a first end of the pre-charge resistor is inserted and connected to the pre-charge relay by a second connection terminal, a resistor harness is connected to the second end of the pre-charge resistor, a slot is provided in the housing for accommodating the resistor harness, and the second end of the pre-charge resistor is provided above the second end of the fuse.

[0016] Preferably, the first end of the pre-charge resistor is insertably connected to a body of the pre-charge relay by the second connection terminal.

[0017] Preferably, the second connection terminal is an insert terminal.

[0018] Preferably, the first end of the fuse is the input end and is provided with a first hole position for a fastening screw to pass through, and the first output end is provided with a second hole position for a fastening screw to pass through.

[0019] Preferably, the input end is connected to a battery by a fastening screw, and the first output end is connected to the power consumer device by a fastening screw.

[0020] Preferably, a baffle plate is provided at the upper end of the face cover, and the second mounting hole and the third mounting hole are located on both sides of the baffle plate, respectively.

[0021] Preferably, the bottom shell is provided with an elastic sheet capable of contacting a side surface of the pre-charge resistor, the face cover is provided with a positioning rib capable of contacting an end surface of the pre-charge resistor, and the pre-charge resistor is a wire-wound resistor.

[0022] Preferably, the main relay core is a shell-less relay.

[0023] In another aspect, an embodiment of the present disclosure further provides a traffic transportation device, the traffic transportation device comprising the power distribution device, a power storage element, and a power consumer, the power distribution device being connected between the power storage element and the power consumer and being used for establishing and disconnecting electrical continuity between the electrical module and the power consumer.

[0024] In the power distribution device and the transportation equipment equipped with the power distribution device according to the present disclosure, the structure of each element in the power distribution device is designed to be interlocking and alternating, and the main positive circuit module and the pre-charge circuit module are installed in the housing so as to be partially or fully stacked, thereby achieving high space utilization rate inside the power distribution device, and the elements do not affect each other, and damaged elements can be replaced individually, which is advantageous for improving the product acceptance rate and reducing losses in product after-sales service, and has low usage costs. [Brief description of the drawings]

[0025] In order to more clearly describe the technical solutions of the embodiments of the present disclosure, the following briefly describes the drawings that need to be used in the embodiments. It is obvious that the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can further obtain other drawings based on these drawings without creative work. [Figure 1] FIG. 1 is a principle schematic diagram showing a power distribution device according to an embodiment of the present disclosure. [Diagram 2] FIG. 1 is a three-dimensional assembly schematic diagram illustrating a power distribution device according to an embodiment of the present disclosure. [Diagram 3] FIG. 1 is a three-dimensional exploded schematic diagram illustrating a power distribution device according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic plan view illustrating a power distribution device according to an embodiment of the present disclosure. [Diagram 5] FIG. 2 is a schematic plan view of a power distribution device according to an embodiment of the present disclosure with a top cover removed. [Figure 6] FIG. 2 is a schematic top view of a power distribution device according to an embodiment of the present disclosure with the top cover and bottom shell removed. [Figure 7] FIG. 2 is another schematic plan view showing a power distribution device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] In order to make the objectives, technical solutions and advantages of the present disclosure more clear and easy to understand, the present disclosure will be described in more detail below in combination with drawings and examples. It should be understood that the specific examples described herein are only used to interpret the present disclosure, and are not intended to limit the present disclosure.

[0027] It should be noted that the terms "installation" and "connection" should be understood in a broad sense, and may refer to direct installation or connection, or indirect installation or connection via a centering member or centering structure, for example.

[0028] In addition, in the embodiments of the present disclosure, terms indicating directions and positional relationships such as "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like are merely intended to facilitate the description of the present disclosure and simplify the description based on the directions or positional relationships shown in the drawings or the normal idle or use state, and do not indicate or imply that the structures, features, devices or elements referred to must have a particular direction or positional relationship, or must be configured and operated in a particular direction, and should not be understood as limitations on the present disclosure. In the description of the present disclosure, unless otherwise specified, the meaning of "plurality" refers to two or more than two.

[0029] Each specific technical feature and each example described in a specific embodiment may be combined in any suitable manner if not inconsistent, for example, different specific technical features / examples may be combined to form different embodiments, and in order to avoid unnecessary duplication, various possible combinations of each specific technical feature / example in this disclosure will not be described separately.

[0030] As shown in FIG. 1 to FIG. 6, an embodiment of the present disclosure provides a power distribution device. The power distribution device includes a housing 9, a precharge circuit module, and a main positive circuit module. The housing 9 has an installation chamber. The precharge circuit module is used to precharge a capacitive element in a power consumption device, and the precharge circuit module includes a precharge relay 8, and the precharge relay is connected in the housing 9. The main positive circuit module is sucked after the precharge circuit module is disconnected, and the precharge circuit module together with the main positive circuit module are stacked up and down in the installation chamber, and the main positive circuit module includes a fuse 2 and a main relay core 4, and the main relay core 4 is connected in the housing 9. The power distribution device has an input end and a first output end, the first end 22 of the fuse 2 is the input end or is connected to the input end, the second end 21 of the fuse 2 is connected to the first end 41 of the main relay core 4, the second end 40 of the main relay core 4 is the first output end or is connected to the first output end, the first end of the pre-charge circuit module is connected to the input end or the second end 21 of the fuse 2, and the second end of the pre-charge circuit module is connected to the second end 40 of the main relay core 4 or the first output end. In this embodiment, the main relay core 4 refers to a semi-finished relay product that does not have at least a case, that is, the main relay is not installed and used as a finished product, but is used using a semi-finished product (core). The structure of each element in the power distribution device is designed to be interlocking and alternating, and the main positive circuit module and the pre-charge circuit module are installed in the housing 9 so as to be partially or completely stacked. This makes it possible to highly utilize the space inside the power distribution device, and the elements do not affect each other, allowing damaged elements to be replaced individually, which is beneficial for improving the product pass rate and reducing losses in product after-sales service, and also reduces the usage cost.The power distribution device according to the embodiment of the present disclosure is a controller or component used for connection and disconnection between a power storage element (e.g., a battery module) and a power consuming device, and is mainly applied to control places where a very large current is generated in the circuit during the power-on and power-off process, such as electric vehicles, electric ships, electric rail transport, or aircraft. In the normal use process of the power distribution device, the pre-charge relay 8 first attracts and charges the capacitive element in the power consuming device product, and the current is controlled within a reasonable range by the resistor in the pre-charge circuit module. After the pre-charge is completed, the main relay core 4 attracts and the pre-charge relay 8 is cut off, the power-on process is completed, and the power supply operation continues. When a short circuit occurs in the power consuming device, the fuse 2 is passively and forcibly melted to cut off the connection between the power consuming device and the power source, and the internal elements of the power consuming device can be protected from damage.

[0031] In one embodiment, the precharge circuit module further includes a precharge resistor 72. In this embodiment, the precharge resistor 72 is a winding resistor. The precharge relay 8 and the main relay core 4 are respectively arranged at both ends of the mounting chamber, the fuse 2 and the precharge resistor 72 are provided between the precharge relay 8 and the main relay core 4, and the fuse 2 and the precharge resistor 72 can be close to the precharge relay 8 and the main relay core 4, and the precharge resistor 72 is arranged at the bottom of the mounting chamber, and the fuse 2 is located above the precharge resistor 72, so that the structure is reasonable and compact, and the space utilization rate is high.

[0032] In one embodiment, the housing 9 includes a bottom shell 6 and a face cover 1, and the face cover 1 can be connected to the bottom shell 6 by a buckle structure or a locking member to form the mounting chamber, the pre-charge relay 8 is connected to the bottom shell 6 by a fastening structure, which has high assembly efficiency, and the main relay core 4 can be connected to the bottom shell 6 by a potting structure (solidification by potting agent), which is helpful in improving heat dissipation performance and high product reliability.

[0033] In one embodiment, a first mounting hole 101 is provided at a position corresponding to the upper part of the precharge relay 8 on the face cover 1, a second mounting hole 102 and a third mounting hole 103 are provided at a position corresponding to the upper part of the main relay core 4 on the face cover 1, and a first end 41 and a second end of the main relay core 4 are respectively located below the second mounting hole 102 and the third mounting hole 103. A mounting window 104 for mounting the fuse 2 is provided on the face cover 1, and the fuse 2 can be placed in the mounting window 104 from top to bottom, and the fuse 2 can be replaced without opening the face cover 1, which facilitates maintenance. When an overcurrent such as a short circuit occurs in a circuit, the fuse 2 needs to be replaced after it melts down, but the above design can effectively shorten the man-hours required for maintenance and helps improve maintenance efficiency. The pre-charge relay 8 is located below the first mounting hole 101, a first end 22 of the fuse 2 extends above the first mounting hole 101, a second end 21 of the fuse 2 extends above the second mounting hole 102, a first end 41 of the main relay core 4 is located below the second mounting hole 102, and a second end 40 of the main relay core 4 is located below the third mounting hole 103, and the second end 21 of the fuse 2 is connected to the first end 41 of the main relay core 4 by a first locking member 3 that penetrates the second mounting hole 102, and the first locking member 3 may be a bolt, and no structural member such as a copper bus bar is required, so the structure is simple, compact, and reliable.

[0034] In one embodiment, the power distribution device further has a second output end, the power distribution device includes a connection harness 5, a first end 51 of the connection harness 5 is inserted and connected to the pre-charge relay 8 by a first connection terminal (insert terminal), which is easy to assemble and maintain, and the second end 52 of the connection harness 5 may be the second output end, and the second end 52 of the connection harness 5 may be a connection copper bus bar terminal.

[0035] In one embodiment, the first end 71 of the pre-charge resistor 72 is inserted and connected to the body 81 of the pre-charge relay 8 by a second connection terminal (insert terminal), which facilitates assembly and maintenance. A resistor harness 7 is connected between the second end 73 of the pre-charge resistor 72 and the pre-charge resistor 72, a slot is provided in the housing 9 for accommodating the resistor harness 7, the second end 73 of the pre-charge resistor 72 is provided above the second end 21 of the fuse 2, and a first locking member 3 (bolt) can be connected to the first end 41 of the main relay core 4 by penetrating the second end 73 of the pre-charge resistor 72 and the second end 21 of the fuse 2.

[0036] In one embodiment, the first end 22 of the fuse 2 is the input end and is provided with a first hole position for a fastening screw to pass through, and the first output end is provided with a second hole position for a fastening screw to pass through, the input end can be connected to a battery via a fastening screw, and the first output end can be connected to a power consumption device via a fastening screw, providing excellent connection reliability.

[0037] In one embodiment, a baffle plate 110 is provided at the upper end of the face cover 1, and the second mounting hole 102 and the third mounting hole 103 are located on both sides of the baffle plate 110, respectively, which is more safe and reliable. The upper end of the face cover 1 refers to the part facing the bottom shell 6 of the housing 9.

[0038] In one embodiment, the bottom shell 6 is provided with an elastic sheet capable of contacting the side of the pre-charge resistor 72, and the face cover 1 is provided with a positioning rib capable of contacting the end face of the pre-charge resistor 72. By limiting and fixing by fitting the limit structure, buckle and upper cover, no parts such as screws are required, and assembly efficiency is high and material management costs are low.

[0039] The present disclosure further provides a traffic transportation device, which comprises the above-mentioned power distribution device, and the traffic transportation device may be an electric vehicle, an electric ship, an electric rail transport or an aircraft, etc.

[0040] The assembly process of the power distribution device according to the embodiment of the present disclosure can be performed with reference to the following assembly procedure.

[0041] The main relay core 4 is placed at one end within the bottom shell 6, and the main relay core 4 is fixed to the bottom shell 6 with a potting agent.

[0042] The body 81 of the pre-charge relay 8 is placed at the other end within the bottom shell 6, and the pre-charge relay 8 is fixed to the bottom shell 6 by a buckle structure.

[0043] The first end 51 of the connection harness 5 and the main body 81 of the precharge relay 8 are connected by an insert terminal.

[0044] The pre-charge resistor 72 (wire-wound resistor) is placed in the bottom shell 6, and the pre-charge resistor 72 is located between the main relay core 4 and the body 81 of the pre-charge relay 8, and the first end 71 of the pre-charge resistor 72 is connected to the body 81 of the pre-charge relay 8 by an insert terminal. The resistor harness 7 is placed in the slot, and then the pre-charge resistor 72 (wire-wound resistor) is fixed by the positioning rib of the upper cover and the elastic sheet of the bottom shell 6.

[0045] The top cover and the bottom shell 6 are attached and fixed together using a buckle system.

[0046] The fuse 2 is placed in the mounting window 104 of the upper cover, the first end 22 of the fuse 2 is located in the first mounting hole 101, the second end 21 of the fuse 2 is located in the second mounting hole 102, the second end 73 of the pre-charge resistor 72 is placed on the second end 21 of the fuse 2, and connected to the first end 41 of the main relay core 4 by the first locking member 3 (screw).

[0047] During the operation of the power distribution device, the current flow can be referred to as follows (in this embodiment, the input terminal is a current input terminal 1001, and the first output terminal and the second output terminal are current output terminals 1002, as shown in Figures 1 to 7):

[0048] 1. Pre-power-on process: When the external control system determines that the pre-power-on has started, the input voltage of the pre-charge relay 8 enters the body 81 of the pre-charge relay 8, starting the operation of the pre-charge relay 8. First, the input current enters the fuse 2 from the first end 22 of the fuse 2, passes through the connection between the second end 21 of the fuse 2 and the second end 73 of the pre-charge resistor 72 and enters the pre-charge resistor 72, then passes through the connection between the first end 71 of the pre-charge resistor 72 and the pre-charge relay 8 and enters the pre-charge relay 8, finally passes through the connection between the pre-charge relay 8 and the first end 51 of the connecting harness 5 and flows out to the connecting harness 5, and finally flows out from the connecting harness 5.

[0049] 2. Pre-power-on power-off process: When the external control system determines that the pre-power-on is completed, the input voltage of the main relay core 4 enters the main relay core 4, the main relay core 4 starts to operate, the pre-charge relay 8 stops operating, and the current stops in the pre-charge resistor 72.

[0050] 3. Discharge process: the main relay core 4 starts to operate, and after the pre-power-on is powered off (the pre-charge circuit module is powered off), the current enters the fuse 2 from the first end 22 of the fuse 2, passes through the connection between the second end 21 of the fuse 2 and the first end 41 of the main relay core 4, enters the main relay core 4, and finally flows out of the main relay core 4.

[0051] The power distribution device and the transportation equipment equipped with the power distribution device according to the embodiment of the present disclosure do not select the normal main relay finished product, but select the main relay core 4, which is the core element thereof, and eliminate the housing of the normal relay product itself, thereby reducing the installation space required for the relay, installing it with a potting structure, and eliminating the installation fixing points for installing the normal relay, thereby saving the installation space and product costs.

[0052] At the same time, the fastening screw mounting feet of the normal pre-charge relay 8 product itself are also eliminated, reducing the required installation space. The pre-charge relay 8 and the bottom shell 6 are changed to be installed in a buckle manner, saving installation space and product costs. In addition, the main positive circuit module is located at the top, and the pre-charge circuit module is located at the bottom, and the layout is aligned with the housing using a stacking method, breaking away from the normal tiling method and making full use of the redundant space inside the module. The pre-charge resistor 72 is fixed by the positioning rib of the upper cover and the elastic sheet of the bottom shell 6. The fastening screw mounting feet of the normal pre-charge resistor 72 are eliminated, further saving installation space and product costs. In addition, the fuse 2 and the main relay core 4 use a fastening screw to lock the second end 21 of the fuse 2 and the first end 41 of the main relay core 4, eliminating the usual pivotal connection method of the connecting copper bus bar, which is helpful in saving installation space and product costs, improves the internal space utilization rate of the power distribution device, and the elements do not affect each other. Damaged elements can be replaced individually, which is beneficial for improving the product pass rate and reducing loss of product after-sales service, and has low usage costs.

[0053] The above is merely a preferred embodiment of the present disclosure, and is not intended to limit the present disclosure. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present disclosure should be included within the scope of protection of the present disclosure.

[0054] This application claims priority to a Chinese patent application submitted to the China Patent Office on August 2, 2021, bearing application number CN202121785979.X and title "Power distribution device and transportation device equipped with said power distribution device," the entire contents of which are incorporated herein by reference.

Claims

1. 1. A power distribution device, comprising: A housing (9) having a mounting chamber; a precharge circuit module including a precharge relay (8) connected within the housing, the precharge circuit module being used to precharge a capacitive element within a power consumer device; a main positive circuit module that is sucked in after the precharge circuit module is disconnected, is stacked vertically in the mounting chamber together with the precharge circuit module, and includes a fuse (2) and a main relay core (4) connected in the housing; the power distribution device has an input end and a first output end, a first end (22) of the fuse is or is connected to the input end, a second end (21) of the fuse is connected to a first end (41) of the main relay core, a second end (40) of the main relay core is or is connected to the first output end, a first end of the precharge circuit module is connected to the input end or the second end of the fuse, and a second end of the precharge circuit module is connected to the second end of the main relay core or the first output end; The power distribution device further has a second output end, the power distribution device includes a connection harness (5), a first end (51) of the connection harness is insertably connected to the pre-charge relay by a first connection terminal, and a second end (52) of the connection harness is the second output end.

2. 2. The power distribution device of claim 1, wherein the pre-charge circuit module further comprises a pre-charge resistor (72), the pre-charge relay and the main relay core are respectively disposed at opposite ends of the mounting chamber, the fuse and the pre-charge resistor are provided between the pre-charge relay and the main relay core, the pre-charge resistor is disposed at the bottom of the mounting chamber, and the fuse is located above the pre-charge resistor.

3. 3. The power distribution device of claim 2, wherein the fuse and the precharge resistor are close to the precharge relay and the main relay core.

4. 2. The power distribution device according to claim 1, wherein the precharge relay is connected to the inside of the housing by a fastening structure or a potting structure, and the main relay core is connected to the inside of the housing by a potting structure or a fastening structure.

5. 2. The power distribution device according to claim 1, wherein the housing includes a bottom shell (6) and a face cover (1), the face cover is connected to the bottom shell by a buckle structure or a locking member to form the mounting chamber, the pre-charge relay is connected to the bottom shell by a fastening structure, and the main relay core is connected to the bottom shell by a potting structure.

6. The power distribution device according to claim 5, characterized in that a first mounting hole (101) is provided in the face cover at a position corresponding to an upper portion of the pre-charge relay, a second mounting hole (102) and a third mounting hole (103) are provided in the face cover at positions corresponding to an upper portion of the main relay core, a mounting window (104) for mounting the fuse is provided in the face cover, the pre-charge relay is located below the first mounting hole, a first end of the fuse extends to an upper portion of the first mounting hole, a second end of the fuse extends to an upper portion of the second mounting hole, a first end of the main relay core is located below the second mounting hole, a second end of the main relay core is located below the third mounting hole, and the second end of the fuse is connected to the first end of the main relay core by a first lock member (3) that penetrates the second mounting hole.

7. 5. The power distribution device of claim 4, wherein the potting structure is formed by solidifying a potting agent.

8. 2. The power distribution device of claim 1, wherein the second end of the connection harness is a connection copper bus bar terminal.

9. The power distribution device according to claim 1 , wherein the first connection terminal is an insert terminal.

10. 2. The power distribution device of claim 1, wherein the input terminal is a current input terminal (1001), and the first output terminal and the second output terminal are current outputs (1002).

11. The power distribution device according to claim 2, characterized in that a first end (71) of the pre-charge resistor is inserted and connected to the pre-charge relay by a second connection terminal, a resistor harness (7) is connected to a second end (73) of the pre-charge resistor, a slot is provided in the housing for accommodating the resistor harness, and the second end of the pre-charge resistor is provided above the second end of the fuse.

12. The power distribution device according to claim 11, characterized in that the first end of the pre-charge resistor is insertably connected to a body (81) of the pre-charge relay by the second connection terminal.

13. The power distribution device according to claim 11, wherein the second connection terminal is an insert terminal.

14. 2. The power distribution device of claim 1, wherein a first end of the fuse is the input end and is provided with a first hole position for a fastening screw to pass through, and a first output end is provided with a second hole position for a fastening screw to pass through.

15. The power distribution device of claim 14, wherein the input end is connected to a battery with a fastening screw, and the first output end is connected to the power consumer with a fastening screw.

16. The power distribution device according to claim 6, further comprising a baffle plate (110) at an upper end of the face cover, the second mounting hole and the third mounting hole being located on both sides of the baffle plate, respectively.

17. The power distribution device according to claim 5, characterized in that the bottom shell is provided with an elastic sheet capable of contacting a side surface of a pre-charge resistor, the face cover is provided with a positioning rib capable of contacting an end surface of the pre-charge resistor, and the pre-charge resistor is a wound resistor.

18. 2. The power distribution device of claim 1, wherein the main relay core is a shell-less relay.

19. A power distribution device according to any one of claims 1 to 18; A power storage element; A transportation device comprising: an electric power consuming device, the power distribution device being connected between the power storage element and the electric power consuming device, and the electric power consuming device being used for establishing and breaking electrical continuity between an electrical module and the electric power consuming device.

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