Battery pack power distribution device and battery pack

Abstract

The utility model relates to battery technology field discloses a kind of battery pack power distribution unit and battery pack. Among them, battery pack power distribution unit includes heat dissipation bottom plate, heat-conducting pad, pedestal, electric connection row and electrical component;Pedestal is set to one side of heat dissipation bottom plate, and pedestal includes pedestal body and limiting structure, and electrical component is installed on pedestal and located the side of limiting structure away from heat dissipation bottom plate;Heat-conducting pad is set between pedestal and heat dissipation bottom plate;Electric connection row is connected with electrical component;At least part of electric connection row is located between limiting structure and heat-conducting pad, and this part of electric connection row projects relative to the side of pedestal body to heat dissipation bottom plate, and abuts with heat-conducting pad.The battery pack power distribution unit of the utility model is high in heat dissipation efficiency, so as to reduce the specification and cost of electrical component.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery pack power distribution device and a battery pack including the battery pack power distribution device. Background Technology

[0002] In existing CTP (Cellto Pack) battery pack designs, the fast charging current conditions are becoming increasingly demanding, typically reaching 3C, 4C, or even 5C. This places stricter performance requirements on the relays and fuses in the fast charging circuit of the battery protection box (BDU). Furthermore, achieving a 50K temperature rise for the BDU is a significant challenge. Using a conventional BDU design, the relay specifications are typically 400A or 600A, the fuse specifications are 850A or 1000A, and the copper busbar overcurrent design is 130mm². 2 This design presents significant challenges for BDU cost, electrical component space layout, component lifespan and performance, and copper busbar temperature rise. Liquid-cooled BDUs typically require a liquid cooling plate, but manufacturers can only achieve a flatness of 1.5 on these plates. To ensure contact between the copper busbar and the liquid cooling plate, thermal grease must be used. However, thermal grease lacks a fixed shape and elasticity, and its application is difficult to control. Furthermore, the shape of the grease is hard to control, and it is easily squeezed into other areas during operation, leading to gaps between the copper busbar and the liquid cooling plate, resulting in poor heat dissipation. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a battery pack power distribution device with good heat dissipation effect, which can reduce the specifications and cost of electrical components.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On one hand, a battery pack power distribution device is provided, including a heat dissipation base plate, a thermal pad, a base, an electrical connector, and electrical components; the base is disposed on one side of the heat dissipation base plate, the base includes a base body and a limiting structure, the electrical components are mounted on the base and located on the side of the limiting structure opposite to the heat dissipation base plate; the thermal pad is disposed between the base and the heat dissipation base plate; the electrical connector is connected to the electrical components; at least a portion of the electrical connector is located between the limiting structure and the thermal pad, this portion of the electrical connector protrudes relative to the base body towards the heat dissipation base plate and abuts against the thermal pad.

[0006] As a further embodiment of the battery pack power distribution device, the base body abuts against the thermal pad.

[0007] As a further embodiment of the battery pack power distribution device, the base body has a mounting hole on the side facing the heat dissipation base plate, the limiting structure is disposed in the mounting hole, and the side of the base body facing the heat-conducting pad protrudes from the side of the limiting structure facing the heat-conducting pad.

[0008] As a further embodiment of the battery pack power distribution device, the electrical components include a main positive relay, a main negative relay, a fast-charging positive relay, and a fast-charging negative relay mounted on the base body. The electrical connection busbar includes a first copper busbar and a second copper busbar. The mounting holes include a first mounting hole and a second mounting hole spaced apart along a horizontal plane. The limiting structure includes a first limiting part installed in the first mounting hole and a second limiting part installed in the second mounting hole. The first copper busbar is located on the side of the first limiting part facing the heat dissipation base plate and abuts against the thermal pad. Both ends of the first copper busbar are bent upwards along its length direction, passing through the base body and electrically connected to the main positive relay and the fast-charging positive relay, respectively. The first limiting part abuts against the first copper busbar. The second copper busbar is located on the side of the second limiting part facing the heat dissipation base plate and abuts against the thermal pad. Both ends of the second copper busbar are bent upwards along its length direction, passing through the base body and electrically connected to the main negative relay and the fast-charging negative relay, respectively. The second limiting part abuts against the second copper busbar.

[0009] As a further embodiment of the battery pack power distribution device, the length of the base body extends along a first direction, the width of the base body extends along a second direction, the fast charging positive relay and the fast charging negative relay are spaced apart on the base body along the first direction, the main positive relay and the main negative relay are spaced apart on the base body along the first direction, and the fast charging positive relay and the main positive relay are directly opposite each other and spaced apart along the second direction, and the fast charging negative relay and the main negative relay are directly opposite each other and spaced apart along the second direction; the first limiting part is located on the side of the fast charging positive relay and / or the main positive relay facing the heat dissipation base plate, and the second limiting part is located on the side of the fast charging negative relay and / or the main negative relay facing the heat dissipation base plate.

[0010] As a further embodiment of the battery pack power distribution device, along the second direction, the main positive relay and the fast charging positive relay are respectively provided with first mounting holes on the side opposite to each other, and the main negative relay and the fast charging negative relay are respectively provided with second mounting holes on the side opposite to each other; the first copper busbar includes a first horizontal section and two first vertical sections perpendicularly connected to the two ends of the first horizontal section along its length direction, the length of the first horizontal section extends along the second direction, the length of the two first vertical sections extends along the vertical direction, and the ends of the two first vertical sections away from the first horizontal section are respectively connected to a first mounting hole by bolts; the second copper busbar includes a second horizontal section and two second vertical sections perpendicularly connected to the two ends of the second horizontal section along its length direction, the length of the second horizontal section extends along the second direction, the length of the two second vertical sections extends along the vertical direction, and the ends of the two second vertical sections away from the second horizontal section are respectively connected to a second mounting hole by bolts, and the first direction, the second direction, and the vertical direction are perpendicular to each other.

[0011] As a further embodiment of the battery pack power distribution device, the first limiting part includes two first limiting frames, which are spaced apart in the first mounting hole along a second direction. The two first limiting frames are respectively adjacent to both ends of the first horizontal segment along its length direction. A hole wall of the first mounting hole along the second direction is adjacent to the first limiting frame. This hole wall is spaced apart from the first limiting frame and forms a through hole for the first vertical segment to pass through. The first limiting frame abuts against the first horizontal segment. The second limiting part includes two second limiting frames, which are spaced apart in the second mounting hole along a second direction. The two second limiting frames are respectively adjacent to both ends of the second horizontal segment along its length direction. A hole wall of the second mounting hole along the second direction is adjacent to the second limiting frame. This hole wall is spaced apart from the second limiting frame and forms a through hole for the second vertical segment to pass through. The second limiting frame abuts against the second horizontal segment.

[0012] As a further embodiment of the battery pack power distribution device, the first limiting frame is fixedly connected to the two hole walls opposite to the first mounting hole along the first direction on both sides along the first direction, and the first horizontal segment contacts the two hole walls opposite to the first mounting hole along the first direction on both sides along the first direction; the second limiting frame is fixedly connected to the two hole walls opposite to the second mounting hole along the first direction on both sides along the first direction, and the second horizontal segment contacts the two hole walls opposite to the second mounting hole along the first direction on both sides along the first direction.

[0013] As a further embodiment of the battery pack power distribution device, the electrical connection busbar also includes four third copper busbars. The main positive relay is connected to the positive terminal of the discharge end through the first third copper busbar, the main negative relay is connected to the negative terminal of the discharge end through the second third copper busbar, the fast charging positive relay is connected to the positive terminal of the fast charging end through the third third copper busbar, and the fast charging negative relay is connected to the negative terminal of the fast charging end through the fourth third copper busbar.

[0014] The limiting structure also includes four sets of third limiting parts corresponding one-to-one with the third copper busbar. The mounting holes also include four sets of third mounting holes spaced apart along the horizontal plane. Each set of the third limiting parts is installed in each third mounting hole. The side of the base body facing the heat-conducting pad protrudes from the side of the third limiting part facing the heat-conducting pad. The third copper busbar is located on the side of the third limiting part facing the heat dissipation base plate and abuts against the heat-conducting pad. The third limiting part abuts against this part of the third copper busbar.

[0015] As a further embodiment of the battery pack power distribution device, the third limiting part includes a plurality of limiting blocks spaced around the sidewall of the third mounting hole, the limiting blocks protruding from the sidewall, and the side of the limiting blocks facing the heat dissipation base plate abutting against the third copper busbar.

[0016] As a further embodiment of the battery pack power distribution device, the electrical components also include a fuse and a shunt mounted on the base body, and the electrical connection busbar further includes a fourth copper busbar and a fifth copper busbar; the first copper busbar is connected to the fourth copper busbar in the area of ​​the first limiting part facing the heat dissipation base plate, and the end of the fourth copper busbar away from the first copper busbar is connected to the fuse, which is connected to the positive terminal of the battery cell group; the second copper busbar is connected to the fifth copper busbar in the area of ​​the second limiting part facing the heat dissipation base plate, and the end of the fifth copper busbar away from the second copper busbar is connected to the shunt, which is connected to the negative terminal of the battery cell group.

[0017] As a further embodiment of the battery pack power distribution device, the base also includes mounting seats. Multiple mounting seats are spaced apart on the outer periphery of the base body. One side of the mounting seat facing the heat dissipation base plate protrudes from the base body to form a gap between the base body and the heat dissipation base plate. The gap is smaller than the thickness of the thermal pad. The mounting seat is connected to the heat dissipation base plate.

[0018] As a further embodiment of the battery pack power distribution device, the outer periphery of the thermal pad is aligned with the outer periphery of the base body, and the side of the mounting base facing the thermal pad is fitted with the outer periphery of the thermal pad.

[0019] As a further embodiment of the battery pack power distribution device, the thermal pad is a solid thermally conductive silicone pad, and the distance between the electrical connection bar located on the side of the limiting structure facing the heat dissipation base plate and the heat dissipation base plate is less than the thickness of the thermal pad.

[0020] As a further embodiment of the battery pack power distribution device, it also includes a cover and multiple protective covers. The cover is snapped onto the base body and engaged with the base body. There is a receiving space between the cover and the base body to accommodate the electrical components. The protective covers are movably connected to the cover and / or movably connected to the base body. The protective covers can cover the location where the electrical components or the electrical connection bar are connected to external equipment.

[0021] On the other hand, a battery pack is provided, including a battery cell assembly and a battery pack power distribution device, wherein the battery pack power distribution device is connected to the battery cell assembly.

[0022] Beneficial effects: This utility model provides mounting holes on the base body and a limiting structure within these holes. This limiting structure secures a portion of the electrical connector to the thermal pad, ensuring a tight fit between the connector and the pad. Heat generated by the electrical components is transferred to the connector, and the thermal pad quickly directs this heat to the heat dissipation plate. The heat dissipation plate then absorbs the heat from the pad, achieving rapid and effective heat dissipation. This, in turn, reduces the specifications and cost of the electrical components. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the battery pack power distribution device according to an embodiment of the present invention;

[0025] Figure 2 This is an exploded view of the battery pack power distribution device according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram illustrating the assembly of the electrical components, electrical connectors, and thermal pads described in an embodiment of this utility model.

[0027] Figure 4 This is a schematic diagram showing the fit between the electrical connector and the base according to an embodiment of the present utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the electrical connector bus described in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the base described in an embodiment of the present utility model;

[0030] Figure 7 This is a top view of the electrical components, electrical connectors, thermal pads, and heat dissipation base plate assembled according to an embodiment of this utility model;

[0031] Figure 8 for Figure 7 Schematic diagram of the sectional view along the central AA direction;

[0032] Figure 9 for Figure 7 Schematic diagram of the BB-direction section;

[0033] Figure 10 This is a schematic diagram of the structure of the first protective cover in an embodiment of the present utility model;

[0034] Figure 11 This is a schematic diagram of the structure of the second protective cover in an embodiment of the present invention.

[0035] In the picture:

[0036] 100. Heat dissipation base plate; 200. Thermal pad; 300. Base; 310. Base body; 311. Connecting plate; 312. Enclosure plate; 320. Mounting seat; 330. First limiting part; 331. First limiting frame; 340. Second limiting part; 341. Second limiting frame; 350. Third limiting part; 400. Electrical connection busbar; 410. First copper busbar; 411. First horizontal section; 412. First vertical section; 420. Second copper busbar; 421. Second horizontal section; 422. Second vertical section; 430. Third copper busbar; 440. Fourth copper busbar; 450. Fifth copper busbar; 500. Electrical components; 510. Main positive relay; 520. Main negative relay; 530. Fast charging positive relay; 540. Fast charging negative relay; 550. Fuse; 551. Contact knife; 560. Shunt; 570. Pre-charge relay; 580. Pre-charge resistor; 600. High-voltage acquisition harness; 700. Low-voltage communication harness; 800. Cover; 900. Protective cover; 910. First protective cover; 911. First mounting notch; 912. First spring; 913. First locking block; 920. Second protective cover; 921. Second mounting notch; 922. Second spring; 923. Second locking block; 924. Positioning protrusion. Detailed Implementation

[0037] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0041] like Figure 1 and Figure 2 As shown, this utility model embodiment provides a battery pack power distribution device, including a heat dissipation base plate 100, a thermal pad 200, a base 300, an electrical connector 400, and an electrical component 500; the base 300 is disposed on one side of the heat dissipation base plate 100, and the base 300 includes a base body 310 and a limiting structure; the electrical component 500 is mounted on the base 300 and located on the side of the limiting structure away from the heat dissipation base plate 100; the thermal pad 200 is disposed between the base 310 and the heat dissipation base plate 100; the electrical connector 400 is connected to the electrical component 500; at least a portion of the electrical connector 400 is located between the limiting structure and the thermal pad 200, and abuts against the thermal pad 200, that is, the limiting structure presses this portion of the electrical connector 400 against the thermal pad 200.

[0042] The battery pack power distribution device of this embodiment uses a limiting structure on the base body 310 to press a portion of the electrical connector 400 against the thermal pad 200. This ensures that the portion of the electrical connector 400 is always in close contact with the thermal pad 200. The heat generated by the electrical component 500 is transferred to the thermal pad 200 through this portion of the electrical connector 400, and then quickly guided to the heat dissipation base plate 100 through the thermal pad 200. The heat dissipation base plate 100 provides rapid heat dissipation, resulting in good heat dissipation effect and high heat dissipation efficiency, thereby reducing the specifications and cost of the electrical component 500. In addition, when the portion of the electrical connector 400 is subjected to a force from one side of the heat dissipation base plate 100, the force can be transferred to the limiting structure. The limiting structure disperses the force onto the base 300, preventing the force from being transmitted to the connection point between the electrical connector 400 and the electrical component 500, ensuring that the connection performance between the electrical connector 400 and the electrical component 500 is not affected.

[0043] Furthermore, the base body 310 abuts against the thermal pad 200.

[0044] Understandably, the base body 310 abuts against the thermal pad 200 to prevent the thermal pad 200 from shifting and to allow the non-abutting area of ​​the thermal pad 200 to expand toward the base body 310, thereby improving the fit between the thermal pad 200 and the corresponding electrical connector 400.

[0045] Furthermore, the base body 310 has a mounting hole on the side facing the heat dissipation base plate 100, and the limiting structure is set in the mounting hole. The side of the base body 310 facing the heat guide pad 200 protrudes from the side of the limiting structure facing the heat guide pad 200.

[0046] By opening mounting holes on the base body and installing the limiting structure in the mounting holes, the side of the limiting structure facing the heat conduction pad 200 is recessed into the side of the base body 310 facing the heat conduction pad 200, so that a receiving space for accommodating the corresponding electrical connection bar 400 is formed between the heat conduction pad 200 and the mounting hole.

[0047] Furthermore, the base 300 also includes mounting bases 320. Multiple mounting bases 320 are provided at intervals on the outer periphery of the base body 310. The side of the mounting base 320 facing the heat dissipation base plate 100 protrudes from the base body 310 to form a gap between the base body 310 and the heat dissipation base plate 100. The gap is smaller than the thickness of the thermal pad 200. The mounting base 320 is connected to the heat dissipation base plate 100.

[0048] Since the mounting base 320 protrudes from the base body 310, when the base 300 is fixed to the heat dissipation base plate 100 via the mounting base 320, a suitable gap can be maintained between the base body 310 and the heat dissipation base plate 100, providing installation space for the thermal pad 200. Since the thickness of the thermal pad 200 is greater than this gap, when the base 300 is fixed to the heat dissipation base plate 100, the base body 310 can fit tightly against the heat dissipation base plate 100 via the thermal pad 200.

[0049] Preferably, the thermal pad 200 is a solid thermally conductive silicone pad, and the base body 310 has a hollow structure in the vertical direction. When the base body 310 comes into contact with the solid thermally conductive silicone pad, it will compress the solid thermally conductive silicone pad. The upward reaction force generated when compressing the solid thermally conductive silicone pad will act directly on the electrical connection bar 400 that comes into contact with the solid thermally conductive silicone pad. The limiting structure will offset the reaction force and distribute the reaction force on the connection node between the base 300 and the heat dissipation base plate 100. This ensures that the reaction force will not act on the load contact of the electrical component 500 (the electrical connection bar 400 is connected to the electrical component 500 by bolts, and the fixed position of the bolts on the electrical component 500 is the load contact), thus ensuring a stable connection between the load contact of the electrical component 500 and the electrical connection bar 400.

[0050] Specifically, such as Figure 4 As shown, there are four mounting bases 320. The four mounting bases 320 are respectively located near the four corners of the base body 310. The mounting bases 320 are connected to the heat dissipation base plate 100 by bolts and locked onto the heat dissipation base plate 100 by nuts. That is, the bolts can disperse the upward reaction force generated by the solid thermal conductive silicone pad when it is compressed by the base body 310.

[0051] Furthermore, the outer periphery of the thermal pad 200 is aligned with the outer periphery of the base body 310, and the mounting base 320 is attached to the outer periphery of the thermal pad 200 on one side facing the thermal pad 200. In other words, the orthographic projection of the thermal pad 200 on the heat dissipation base plate 100 coincides with the orthographic projection of the base body 310 on the heat dissipation base plate 100. Since the mounting base 320 protrudes from the side of the base body 310 facing the heat dissipation base plate 100, a limiting installation area is formed among the multiple mounting bases 320. When installing the thermal pad 200, the mounting base 320 can be used to quickly position the installation position of the thermal pad 200, so that the outer periphery of the thermal pad 200 is attached to all the mounting bases 320, avoiding the thermal pad 200 from shifting during the attachment process between the base body 310 and the thermal pad 200, effectively improving installation efficiency.

[0052] Optionally, the heat dissipation base plate 100 is made of aluminum plate, manufactured by mold, which ensures the flatness and dimensions of the aluminum plate, provides excellent heat dissipation, and is lightweight. In other embodiments, other metal plates with good heat dissipation can also be selected.

[0053] In this embodiment, the distance between the portion of the electrical connector 400 located on the side of the limiting structure facing the heat dissipation base plate 100 and the heat dissipation base plate 100 is less than the thickness of the thermal pad 200, so that the portion of the electrical connector 400 and the thermal pad 200 are in close contact.

[0054] Furthermore, such as Figure 3 and Figure 7 As shown, the electrical component 500 in this embodiment includes a main positive relay 510, a main negative relay 520, a fast charging positive relay 530, and a fast charging negative relay 540 mounted on the base body 310. The electrical connection busbar 400 includes a first copper busbar 410 and a second copper busbar 420. The mounting holes include a first mounting hole and a second mounting hole spaced apart along a horizontal plane. The limiting structure includes a first limiting part 330 and a second limiting part 340 spaced apart along a horizontal plane. The first limiting part 330 is installed in the first mounting hole, and the second limiting part 340 is installed in the second mounting hole. The first copper busbar 410 is located at the first limiting part 330 facing the heat dissipation base. The first copper busbar 410 is located on one side of the heat dissipation base plate 100 and abuts against the heat-conducting pad 200. The two ends of the first copper busbar 410 are bent upward along its length direction and pass through the base body 310 and are electrically connected to the main positive relay 510 and the fast charging positive relay 530 respectively. The first limiting part 330 abuts against the first copper busbar 410. The second copper busbar 420 is located on the side of the second limiting part 340 facing the heat dissipation base plate 100 and abuts against the heat-conducting pad 200. The two ends of the second copper busbar 420 are bent upward along its length direction and pass through the base body 310 and are electrically connected to the main negative relay 520 and the fast charging negative relay 540 respectively. The second limiting part 340 abuts against the second copper busbar 420.

[0055] One of the main heat sources in the battery pack power distribution device is the relay. When the battery pack is fast-charging, the magnetic cylinder of the fast-charging positive relay 530 generates a huge amount of heat. The first copper busbar 410 is connected to the load contact of the fast-charging positive relay 530. The heat inside the magnetic cylinder of the fast-charging positive relay 530 is transferred to the locking position of the first copper busbar 410 through the load contact. The heat is then transferred along the first copper busbar 410 to the heat-conducting pad 200, and then along the heat-conducting pad 200 to the heat dissipation base plate 100. The heat inside the magnetic cylinder of the fast-charging positive relay 530 is dissipated through the large surface of the heat dissipation base plate 100 (the side of the heat dissipation base plate 100 along its thickness direction (vertical direction)). Similarly, the fast-charging negative relay 540 magnet cylinder generates a huge amount of heat. The second copper busbar 420 is connected to the load contact of the fast-charging negative relay 540. The heat inside the fast-charging negative relay 540 magnet cylinder is transferred to the locking position of the second copper busbar 420 through the load contact. The heat is transferred along the second copper busbar 420 to the heat-conducting pad 200, and then along the heat-conducting pad 200 to the heat dissipation base plate 100. The heat inside the fast-charging negative relay 540 magnet cylinder is dissipated through the large surface of the heat dissipation base plate 100.

[0056] Furthermore, such as Figures 3 to 7 As shown, the length of the base body 310 extends along a first direction, and the width of the base body 310 extends along a second direction. The fast charging positive relay 530 and the fast charging negative relay 540 are installed on the base body 310 at intervals along the first direction. The main positive relay 510 and the main negative relay 520 are installed on the base body 310 at intervals along the first direction. The fast charging positive relay 530 and the main positive relay 510 are directly opposite each other and spaced apart along the second direction. The fast charging negative relay 540 and the main negative relay 520 are directly opposite each other and spaced apart along the second direction. The first limiting part 330 is located on the side of the fast charging positive relay 530 and / or the main positive relay 510 facing the heat dissipation base plate 100. The second limiting part 340 is located on the side of the fast charging negative relay 540 and / or the main negative relay 520 facing the heat dissipation base plate 100.

[0057] In this embodiment, the main positive relay 510, main negative relay 520, fast charging positive relay 530, and fast charging negative relay 540 adopt the above-described layout. Furthermore, by placing the first limiting part 330 below the main positive relay 510 and / or the fast charging positive relay 530, and placing the second limiting part 340 below the fast charging negative relay 540 and / or the main negative relay 520, the structural compactness of the electrical component 500 can be improved, and the implementation difficulty of the circuit structure can be reduced.

[0058] Furthermore, along the second direction, the main positive relay 510 and the fast-charging positive relay 530 each have a first mounting hole on the side opposite to each other, and the main negative relay 520 and the fast-charging negative relay 540 each have a second mounting hole on the side opposite to each other. In other words, the main positive relay 510 has a first mounting hole on the side opposite to the fast-charging positive relay 530 along the second direction, and the fast-charging positive relay 530 also has a first mounting hole on the side opposite to the main positive relay 510 along the second direction. The main negative relay 520 has a second mounting hole on the side opposite to the fast-charging negative relay 540 along the second direction, and the fast-charging negative relay 540 also has a second mounting hole on the side opposite to the main negative relay 520 along the second direction. Figure 8As shown, the first copper busbar 410 includes a first horizontal section 411 and two first vertical sections 412 perpendicularly connected to the two ends of the first horizontal section 411 along its length. The length of the first horizontal section 411 extends along a second direction, and the lengths of the two first vertical sections 412 extend along a vertical direction. The ends of the two first vertical sections 412 away from the first horizontal section 411 are respectively connected to a first mounting hole by bolts. The second copper busbar 420 includes a second horizontal section 421 and two second vertical sections 422 perpendicularly connected to the two ends of the second horizontal section 421 along its length. The length of the second horizontal section 421 extends along a second direction, and the lengths of the two second vertical sections 422 extend along a vertical direction. The ends of the two second vertical sections 422 away from the second horizontal section 421 are respectively connected to a second mounting hole by bolts. The first direction, the second direction, and the vertical direction are perpendicular to each other.

[0059] In this embodiment, by placing the first mounting holes on the main positive relay 510 and the fast-charging positive relay 530 on a side opposite to each other along the second direction, the length of the first horizontal segment 411 can be increased, thereby increasing the contact area between the first copper busbar 410 and the thermal pad 200, resulting in high heat dissipation efficiency. Similarly, by placing the second mounting holes on the main negative relay 520 and the fast-charging negative relay 540 on a side opposite to each other along the second direction, the length of the second horizontal segment 421 can be increased, thereby increasing the contact area between the second copper busbar 420 and the thermal pad 200, resulting in good heat dissipation and high heat dissipation efficiency. This allows for a reduction in the specifications of the main positive relay 510, the main negative relay 520, the fast-charging positive relay 530, and the fast-charging negative relay 540, optimizing the operating environment of each relay, increasing the service life of each relay, and simultaneously reducing the overcurrent size of each copper busbar, thus lowering the cost of the battery pack power distribution device.

[0060] Furthermore, the first limiting part 330 includes two first limiting frames 331, which are spaced apart along a second direction within the first mounting hole. The two first limiting frames 331 are respectively adjacent to both ends of the first horizontal segment 411 along its length. A hole wall of the first mounting hole along the second direction is adjacent to the first limiting frame 331, and this hole wall is spaced apart from the first limiting frame 331, forming a through hole for the first vertical segment 412 to pass through. The first limiting frame 331 and the first horizontal segment 412... The second limiting part 340 includes two second limiting frames 341, which are spaced apart in the second mounting hole along the second direction. The two second limiting frames 341 are respectively adjacent to the two ends of the second horizontal segment 421 along its length direction. A hole wall of the second mounting hole along the second direction is adjacent to the second limiting frame 341. The hole wall is spaced apart from the second limiting frame 341 and forms a through hole for the second vertical segment 422 to pass through. The second limiting frame 341 abuts against the second horizontal segment 421.

[0061] In this embodiment, the two first limiting brackets 331 can abut against the two ends of the first horizontal segment 411 near its length direction, so as to avoid the phenomenon that one end of the first horizontal segment 411 is raised and cannot be tightly attached to the heat-conducting pad 200; the two second limiting brackets 341 can abut against the two ends of the second horizontal segment 421 near its length direction, so as to avoid the phenomenon that one end of the second horizontal segment 421 is raised and cannot be tightly attached to the heat-conducting pad 200.

[0062] For example, of the two first limiting brackets 331, one first limiting bracket 331 is located below the main positive relay 510, and the other first limiting bracket 331 is located below the fast charging positive relay 530; of the two second limiting brackets 341, one second limiting bracket 341 is located below the main negative relay 520, and the other second limiting bracket 341 is located below the fast charging negative relay 540. The first limiting brackets 331 and the second limiting brackets 341 have the same structure, which is a slot plate structure. The two ends of the slot plate structure along its length direction are connected to the sidewalls of the corresponding mounting holes. The width direction of the slot plate structure extends along the length direction of the corresponding copper busbar. The slot opening of the slot plate structure faces the heat guide pad 200. The base body 310 has a hollow structure, consisting of multiple interlocking connecting plates 311 and a surrounding plate 312 surrounding the connecting plates 311. The first mounting hole and the second mounting hole are two through holes of the base body 310. The shape of the corresponding through holes is designed according to the bending structure of the first copper busbar 410 and the second copper busbar 420, which will not be described in detail here.

[0063] Furthermore, the first limiting frame 331 is fixedly connected to the two opposite walls of the first mounting hole along the first direction on both sides of the first direction, and the first horizontal segment 411 contacts the two opposite walls of the first mounting hole along the first direction on both sides of the first direction. This allows the first copper busbar 410 to be positioned by the two opposite walls of the first mounting hole along the first direction, improving the installation efficiency of the first copper busbar 410, and ensuring high installation stability of the first limiting frame 331. Similarly, the second limiting frame 341 is fixedly connected to the two opposite walls of the second mounting hole along the first direction on both sides of the first direction, and the second horizontal segment 421 contacts the two opposite walls of the second mounting hole along the first direction on both sides of the first direction. This allows the second copper busbar 420 to be positioned by the side wall of the second mounting hole, improving the installation efficiency of the second copper busbar 420, and ensuring high installation stability of the second limiting frame 341.

[0064] In this embodiment, the base 300 is an integral injection-molded structure.

[0065] For example, the solid thermally conductive silicone pad in this embodiment is selected from TP300-H40-S, with a thermal conductivity of 3.0 W / mK and a compression elongation greater than 50%. It is an ultra-soft thermally conductive silicone sheet that exhibits low thermal resistance and high deformation under low pressure, and has excellent gap-filling performance. In addition, this solid thermally conductive silicone pad is self-adhesive, eliminating the need for an additional adhesive coating that hinders thermal conductivity.

[0066] Preferably, the gap between the lower surface of the first horizontal section 411 of the first copper busbar 410, the lower surface of the second horizontal section 421 of the second copper busbar 420, and the upper surface of the heat dissipation base plate 100 is 2.5-3.1mm, and the thickness of the solid thermal conductive silicone pad (TP300-H40-S) is 4mm, which allows the compression of the solid thermal conductive silicone pad to be within its allowable compression extension range. Therefore, a solid thermal conductive silicone pad with a thickness of 4mm can completely fill the gap.

[0067] For example, the lower surface of the first horizontal segment 411 of the first copper busbar 410 and the lower surface of the second horizontal segment 421 of the second copper busbar 420 are on the same horizontal plane, and the gap between this horizontal plane and the upper surface of the heat sink base plate 100 is 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, or 3.1mm. The thickness of the thermal pad 200 is also not limited to 4mm; the specific gap between the horizontal plane and the upper surface of the heat sink base plate 100, as well as the thickness of the thermal pad 200, are determined according to the actual situation.

[0068] Furthermore, the electrical connection busbar 400 in this embodiment also includes four third copper busbars 430. The main positive relay 510 is connected to the positive terminal of the discharge end through the first third copper busbar 430, the main negative relay 520 is connected to the negative terminal of the discharge end through the second third copper busbar 430, the fast charging positive relay 530 is connected to the positive terminal of the fast charging end through the third third copper busbar 430, and the fast charging negative relay 540 is connected to the negative terminal of the fast charging end through the fourth third copper busbar 430. The limiting structure also includes four sets of third limiting parts 350 corresponding one-to-one with the third copper busbars 430. The mounting holes also include four sets of third mounting holes spaced apart along the horizontal plane. Each third mounting hole is equipped with a set of third limiting parts 350. The side of the base body 310 facing the heat-conducting pad 200 protrudes from the side of the third limiting part 350 facing the heat-conducting pad 200. Part of the third copper busbar 430 is located on the side of the third limiting part 350 facing the heat dissipation base plate 100 and abuts against the heat-conducting pad 200. The third limiting part 350 abuts against this part of the third copper busbar 430.

[0069] In this embodiment, four third copper busbars 430 are provided with four third mounting holes recessed at intervals on the side of the base body 310 facing the heat dissipation base plate 100 for mounting the third limiting part 350. By bending a portion of the third copper busbar 430 and placing it in the corresponding third mounting hole and on the side of the third limiting part 350 facing the heat dissipation base plate 100, the third copper busbar 430 is limited and pressed by the side wall of the third mounting hole and the third limiting part 350, so that this portion of the third copper busbar 430 is tightly attached to the thermal pad 200. The reaction force of the thermal pad 200 on the third copper busbar 430 is released by the third limiting part 350 to the bolts used to connect the mounting base 320 and the heat dissipation base plate 100, so as to avoid the third copper busbar 430 from loosening due to the reaction force between the load contacts and the load contacts, and to ensure connection stability.

[0070] Furthermore, the third limiting part 350 includes multiple limiting blocks spaced apart and arranged on the sidewall of the third mounting hole. The limiting blocks protrude from the sidewall, and the side of the limiting block facing the heat dissipation base plate 100 abuts against the third copper busbar 430. By designing each third limiting part 350 as a structure of multiple limiting blocks, the installation of the third copper busbar 430 can be facilitated. Specifically, the four third mounting holes are four spaced-apart hollow holes in the base body 310. The hollow holes penetrate the base body 310 vertically, and the shape of the hollow holes is designed according to the bending structure of the third copper busbar 430, which will not be described in detail here.

[0071] Furthermore, the electrical component 500 also includes a fuse 550 and a shunt 560 mounted on the base body 310, and the electrical connection bus 400 also includes a fourth copper bus 440 and a fifth copper bus 450; as Figure 8 and Figure 9 As shown, the area of ​​the first copper busbar 410 located on the side of the first limiting part 330 facing the heat dissipation base plate 100 is connected to the fourth copper busbar 440. The end of the fourth copper busbar 440 away from the first copper busbar 410 is connected to the fuse 550, which is connected to the positive terminal of the battery cell assembly. The area of ​​the second copper busbar 420 located on the side of the second limiting part 340 facing the heat dissipation base plate 100 is connected to the fifth copper busbar 450. The end of the fifth copper busbar 450 away from the second copper busbar 420 is connected to the shunt 560, which is connected to the negative terminal of the battery cell assembly.

[0072] In this embodiment, the fuse 550 is also one of the main heat sources of the battery pack power distribution device. When the battery pack is fast-charging, a huge amount of heat is generated inside the fuse 550. The heat is transferred along the internal conductor of the fuse 550 to the contact 551 of the fuse 550. The fourth copper busbar 440 is connected to the contact 551 of the fuse 550. The heat is transferred along the fourth copper busbar 440 to the first copper busbar 410, then along the first copper busbar 410 to the thermal pad 200, and finally along the solid thermal conductive silicone pad to the heat dissipation base plate 100. The heat inside the fuse 550 is dissipated through the large surface of the heat dissipation base plate 100.

[0073] For example, the first horizontal section 411 of the first copper busbar 410 is provided with a first rivet screw, which is located on the side of the first horizontal section 411 away from the heat-conducting pad 200. The fourth copper busbar 440 has a connecting hole, through which the first rivet screw passes and is locked in place by a first nut. The upper surface of the fourth copper busbar 440 adjacent to its other end (the side away from the heat-conducting pad 200) is provided with a second rivet screw, and the contact blade 551 of the fuse 550 has a corresponding connecting hole. The second rivet screw passes through this connecting hole and is locked in place by a second nut, thereby realizing the electrical connection between the fuse 550 and the first copper busbar 410. The connection structure between the fifth copper busbar 450 and the second copper busbar 420 is the same as the connection structure between the fourth copper busbar 440 and the first copper busbar 410, and the connection structure between the fifth copper busbar 450 and the shunt 560 is the same as the connection structure between the fourth copper busbar 440 and the fuse 550, which will not be described in detail here.

[0074] Furthermore, such as Figure 3 As shown, the electrical component 500 also includes a pre-charge relay 570 and a pre-charge resistor 580 mounted on the base body 310. The main positive relay 510, main negative relay 520, fast-charge positive relay 530, fast-charge negative relay 540, fuse 550, pre-charge relay 570, and pre-charge resistor 580 are respectively connected to the high-voltage acquisition harness 600 via high-voltage lines, and the high-voltage acquisition harness 600 acquires voltage and current signals. The main positive relay 510, main negative relay 520, fast-charge positive relay 530, fast-charge negative relay 540, fuse 550, and pre-charge relay 570 are respectively connected to the low-voltage communication harness 700 via communication lines, and the low-voltage communication harness 700 transmits control signals and status feedback to the BMS (Battery Management System).

[0075] The precharge relay 570 is spaced between the main positive relay 510 and the main negative relay 520, and between the fast charge positive relay 530 and the fast charge negative relay 540. That is, the precharge relay 570 is located near the center of the base body 310. The fuse 550 is located at one end of the base body 310 along the first direction and is adjacent to the main positive relay 510 and the fast charge positive relay 530. The shunt 560 is located at the other end of the base body 310 along the first direction and is adjacent to the main negative relay 520 and the fast charge negative relay 540. The precharge resistor 580 is located on the side of the fuse 550 away from the main positive relay 510 along the first direction.

[0076] This embodiment, through a reasonable layout of the electrical components 500 and various copper busbars, allows the heat generated by the electrical components 500 to be transferred to the thermal pads 200 via the corresponding copper busbars under the action of the limiting structure and the thermal pads 200. The heat dissipation base plate 100 absorbs and dissipates heat from the thermal pads 200, thereby reducing the derating of the specifications of each electrical component 500, optimizing the operating environment of the electrical components 500, extending the service life of the electrical components 500, reducing the specifications of the electrical components 500 and the current-carrying dimensions of the copper busbars, and lowering the cost of the battery pack power distribution device. For example, the fuse 550 has a specification of 700A, the main positive relay 510 and the main negative relay 520 have specifications of 250A, and the fast-charging positive relay 530 and the fast-charging negative relay 540 have specifications of 250A.

[0077] Furthermore, the battery pack power distribution device in this embodiment also includes a cover 800 and multiple protective covers 900. The cover 800 is fastened to the base body 310 and snapped into the base body 310, making it easy to install and remove. There is a space between the cover 800 and the base 300 to accommodate the electrical component 500. The protective cover 900 is movably connected to the cover 800, and / or the protective cover 900 is movably connected to the base body 310. The protective cover 900 can cover the position where the electrical component 500 or the electrical connection bar 400 is connected to the external equipment, thereby protecting the position. The protective cover 900 can be opened only as needed during use. In this embodiment, the cover 800, the protective cover 900, and the base 300 are all made of plastic.

[0078] The cover 800 has multiple buckles on its outer periphery, and the base body 310 has protrusions on its outer periphery of the surrounding plate 312. When the cover 800 and the base body 310 are mated, the buckles engage with the protrusions. Alternatively, in other embodiments, protrusions can be provided on the outer periphery of the cover 800, and buckles corresponding to the protrusions can be provided on the outer periphery of the base body 310, which can also achieve engagement and facilitate easy assembly and disassembly.

[0079] Furthermore, the protective cover 900 includes two first protective covers 910 and two second protective covers 920. The first protective cover 910 covers the node where the fuse 550 is connected to the positive terminal of the battery cell group and the node where the shunt 560 is connected to the negative terminal of the battery cell group. The first protective cover 910 is pivotally connected to the cover body 800 and is snapped to the base body 310 through a first snap-fit ​​structure. The discharge end and fast charging end of the battery pack power distribution device are each covered by a second protective cover 920, and the second protective cover 920 is snapped to the cover body 800.

[0080] Specifically, such as Figure 10 As shown, the first protective cover 910 has a first mounting notch 911 on one side of the surrounding plate 312 of the base body 310. A first spring piece 912 is installed at the first mounting notch 911. The lower end of the first spring piece 912 is connected to the side wall of the first mounting notch 911, and the upper end of the first spring piece 912 extends upward. A first locking block 913 protrudes from the side of the first spring piece 912 facing the surrounding plate 312. A first locking hole is provided on the surrounding plate 312 corresponding to the first locking block 913. Pressing down the first protective cover 910 can cause the first locking block 913 to be locked into the first locking hole and cause the first spring piece 912 to abut against the surrounding plate 312. The first mounting notch 911, the first spring piece 912, the first locking block 913 on the first protective cover 910 and the first locking hole on the surrounding plate 312 constitute a first locking structure.

[0081] like Figure 11 As shown, the second protective cover 920 is engaged with the cover body 800 via a set of second snap-fit ​​structures on both sides along the first direction. The second protective cover 920 has a second mounting notch 921 on each side along the first direction. A second spring piece 922 is installed at the second mounting notch 921. The lower end of the second spring piece 922 connects to the side wall of the second mounting notch 921, and the upper end of the second spring piece 922 extends upward. A second locking block 923 protrudes from the side of the second spring piece 922 facing the cover body 800. A second locking hole is provided on the cover body 800 corresponding to the second locking block 923. Pressing down on the second protective cover 920 allows the second locking block 923 to engage with the second locking hole and the second spring piece 922 to abut against the cover body 800. The second mounting notch 921, the second spring piece 922, the second locking block 923 on the second protective cover 920, and the second locking hole on the cover body 800 constitute the second snap-fit ​​structure.

[0082] Furthermore, in order to quickly align the second locking block 923 with the second locking hole and improve assembly efficiency, this embodiment provides two positioning protrusions 924 on both sides of the second protective cover 920 along the first direction. The positioning protrusions 924 are located on both sides of the second mounting notch 921 along the second direction. Correspondingly, the cover body 800 is provided with positioning grooves that correspond one-to-one with the positioning protrusions 924. When the positioning protrusions 924 are inserted into the positioning grooves and the second protective cover 920 is pressed down, the second locking block 923 can be aligned with the second locking hole to achieve locking.

[0083] Furthermore, the connecting plate 311 of the base body 310 is composed of multiple horizontally arranged plates and multiple vertically arranged plates connected together. The positive and negative terminals of the fast charging end are separated by one vertical plate, and the positive and negative terminals of the discharge end are separated by another vertical plate. The two vertical plates can act as partitions to prevent the risk of short circuits. The second protective cover 920 has a clearance groove corresponding to the partition; when assembling the second protective cover 920, the partition is inserted into the clearance groove, which can also play a positioning role in the installation of the second protective cover 920.

[0084] This embodiment also provides a battery pack, including a cell assembly and a battery pack power distribution device according to any of the above embodiments, wherein the battery pack power distribution device is connected to the cell assembly. Specifically, the positive terminal of the cell assembly is electrically connected to the main fuse 550, and the negative terminal of the cell assembly is electrically connected to the shunt 560.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack power distribution device, characterized in that, The device includes a heat dissipation base plate, a thermal pad, a base, an electrical connector, and electrical components. The base is disposed on one side of the heat dissipation base plate and includes a base body and a limiting structure. The electrical components are mounted on the base and located on the side of the limiting structure opposite to the heat dissipation base plate. The thermal pad is disposed between the base and the heat dissipation base plate. The electrical connector is connected to the electrical components. At least a portion of the electrical connector is located between the limiting structure and the thermal pad, and this portion of the electrical connector protrudes relative to the base body towards the heat dissipation base plate and abuts against the thermal pad.

2. The battery pack power distribution device according to claim 1, characterized in that, The base body abuts against the thermal pad.

3. The battery pack power distribution device according to claim 2, characterized in that, The base body has a mounting hole on the side facing the heat dissipation base plate, the limiting structure is disposed in the mounting hole, and the side of the base body facing the heat conduction pad protrudes from the side of the limiting structure facing the heat conduction pad.

4. The battery pack power distribution device according to claim 3, characterized in that, The electrical components include a main positive relay, a main negative relay, a fast-charging positive relay, and a fast-charging negative relay mounted on the base body. The electrical connection busbar includes a first copper busbar and a second copper busbar. The mounting holes include a first mounting hole and a second mounting hole spaced apart along a horizontal plane. The limiting structure includes a first limiting part installed in the first mounting hole and a second limiting part installed in the second mounting hole. The first copper busbar is located on the side of the first limiting part facing the heat dissipation base plate and abuts against the thermal pad. Both ends of the first copper busbar are bent upwards along its length direction, passing through the base body and electrically connected to the main positive relay and the fast-charging positive relay, respectively. The first limiting part abuts against the first copper busbar. The second copper busbar is located on the side of the second limiting part facing the heat dissipation base plate and abuts against the thermal pad. Both ends of the second copper busbar are bent upwards along its length direction, passing through the base body and electrically connected to the main negative relay and the fast-charging negative relay, respectively. The second limiting part abuts against the second copper busbar.

5. The battery pack power distribution device according to claim 4, characterized in that, The base body extends in length along a first direction and in width along a second direction. The fast charging positive relay and the fast charging negative relay are mounted on the base body at intervals along the first direction. The main positive relay and the main negative relay are also mounted on the base body at intervals along the first direction. The fast charging positive relay and the main positive relay are directly opposite each other and spaced apart along the second direction, and the fast charging negative relay and the main negative relay are directly opposite each other and spaced apart along the second direction. The first limiting part is located on the side of the fast charging positive relay and / or the main positive relay facing the heat dissipation base plate, and the second limiting part is located on the side of the fast charging negative relay and / or the main negative relay facing the heat dissipation base plate.

6. The battery pack power distribution device according to claim 5, characterized in that, Along the second direction, the main positive relay and the fast charging positive relay are respectively provided with first mounting holes on the side opposite to each other, and the main negative relay and the fast charging negative relay are respectively provided with second mounting holes on the side opposite to each other; the first copper busbar includes a first horizontal section and two first vertical sections perpendicularly connected to the two ends of the first horizontal section along its length direction, the length of the first horizontal section extends along the second direction, the length of the two first vertical sections extends along the vertical direction, and the ends of the two first vertical sections away from the first horizontal section are respectively connected to a first mounting hole by bolts; the second copper busbar includes a second horizontal section and two second vertical sections perpendicularly connected to the two ends of the second horizontal section along its length direction, the length of the second horizontal section extends along the second direction, the length of the two second vertical sections extends along the vertical direction, and the ends of the two second vertical sections away from the second horizontal section are respectively connected to a second mounting hole by bolts, the first direction, the second direction and the vertical direction are perpendicular to each other.

7. The battery pack power distribution device according to claim 6, characterized in that, The first limiting part includes two first limiting frames, which are spaced apart in the first mounting hole along a second direction. The two first limiting frames are respectively adjacent to both ends of the first horizontal segment along its length direction. A hole wall of the first mounting hole along the second direction is adjacent to the first limiting frame. This hole wall is spaced apart from the first limiting frame and forms a through hole for the first vertical segment to pass through. The first limiting frame abuts against the first horizontal segment. The second limiting part includes two second limiting frames, which are spaced apart in the second mounting hole along a second direction. The two second limiting frames are respectively adjacent to both ends of the second horizontal segment along its length direction. A hole wall of the second mounting hole along the second direction is adjacent to the second limiting frame. This hole wall is spaced apart from the second limiting frame and forms a through hole for the second vertical segment to pass through. The second limiting frame abuts against the second horizontal segment.

8. The battery pack power distribution device according to claim 7, characterized in that, The first limiting frame is fixedly connected to the two hole walls of the first mounting hole along the first direction on both sides along the first direction, and the first horizontal segment is in contact with the two hole walls of the first mounting hole along the first direction on both sides along the first direction; the second limiting frame is fixedly connected to the two hole walls of the second mounting hole along the first direction on both sides along the first direction, and the second horizontal segment is in contact with the two hole walls of the second mounting hole along the first direction on both sides along the first direction.

9. The battery pack power distribution device according to claim 4, characterized in that, The electrical connection bus also includes four third copper busbars. The main positive relay is connected to the positive terminal of the discharge terminal through the first third copper busbar, the main negative relay is connected to the negative terminal of the discharge terminal through the second third copper busbar, the fast charging positive relay is connected to the positive terminal of the fast charging terminal through the third third copper busbar, and the fast charging negative relay is connected to the negative terminal of the fast charging terminal through the fourth third copper busbar. The limiting structure also includes four sets of third limiting parts corresponding one-to-one with the third copper busbar. The mounting holes also include four sets of third mounting holes spaced apart along the horizontal plane. Each set of the third limiting parts is installed in each third mounting hole. The side of the base body facing the heat-conducting pad protrudes from the side of the third limiting part facing the heat-conducting pad. The third copper busbar is located on the side of the third limiting part facing the heat dissipation base plate and abuts against the heat-conducting pad. The third limiting part abuts against this part of the third copper busbar.

10. The battery pack power distribution device according to claim 9, characterized in that, The third limiting part includes a plurality of limiting blocks spaced around the sidewall of the third mounting hole. The limiting blocks protrude from the sidewall and abut against the third copper busbar on the side of the limiting block facing the heat dissipation base plate.

11. The battery pack power distribution device according to claim 4, characterized in that, The electrical components also include a fuse and a shunt mounted on the base body. The electrical connection busbar also includes a fourth copper busbar and a fifth copper busbar. The first copper busbar is connected to the fourth copper busbar in the area of ​​the first limiting part facing the heat dissipation base plate. The end of the fourth copper busbar away from the first copper busbar is connected to the fuse, and the fuse is connected to the positive terminal of the battery cell assembly. The second copper busbar is connected to the fifth copper busbar in the area of ​​the second limiting part facing the heat dissipation base plate. The end of the fifth copper busbar away from the second copper busbar is connected to the shunt, and the shunt is connected to the negative terminal of the battery cell assembly.

12. The battery pack power distribution device according to any one of claims 1 to 11, characterized in that, The base also includes mounting seats. Multiple mounting seats are spaced apart on the outer periphery of the base body. The mounting seats protrude from the base body on one side facing the heat dissipation base plate to form a gap between the base body and the heat dissipation base plate. The gap is smaller than the thickness of the thermal pad. The mounting seats are connected to the heat dissipation base plate.

13. The battery pack power distribution device according to claim 12, characterized in that, The outer periphery of the thermal pad is aligned with the outer periphery of the base body, and the side of the mounting base facing the thermal pad is in contact with the outer periphery of the thermal pad.

14. The battery pack power distribution device according to any one of claims 1 to 11, characterized in that, The thermal pad is a solid thermally conductive silicone pad, and the distance between the electrical connection bar on the side of the limiting structure facing the heat dissipation base plate and the heat dissipation base plate is less than the thickness of the thermal pad.

15. The battery pack power distribution device according to any one of claims 1 to 11, characterized in that, It also includes a cover and multiple protective covers. The cover is snapped onto the base body and engaged with the base body. There is a receiving space between the cover and the base body to accommodate the electrical component. The protective covers are movably connected to the cover and / or movably connected to the base body. The protective covers can cover the location where the electrical component or the electrical connection bar is connected to external equipment.

16. A battery pack, characterized in that, It includes a battery cell assembly and a battery pack power distribution device as described in any one of claims 1 to 15, wherein the battery pack power distribution device is connected to the battery cell assembly.

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