Battery pack circuit breaking unit, battery pack and vehicle

Abstract

The utility model discloses a battery pack circuit breaking unit, a battery pack and a vehicle. The battery pack circuit breaking unit comprises a shell, an electrical element and an electrical element connecting piece. The shell is provided with a containing cavity and a hollowed-out area, and the hollowed-out area communicates with the containing cavity and the external environment. The electrical element is arranged in the accommodating cavity. The electrical element connecting piece is arranged in the containing cavity and electrically connected with the electrical element, the electrical element connecting piece is provided with a heat dissipation part at the position of the hollowed-out area, and the heat dissipation part is exposed out of the hollowed-out area to conduct heat exchange with the outside of the shell. A large amount of heat generated when the electrical element works can be transferred to the heat dissipation part of the electrical element connecting piece, and then the heat dissipation part of the electrical element connecting piece performs heat transfer with the external environment, so that the large amount of heat is discharged from the limited space; the problems that the cost is increased and the installation space of the containing cavity is increased due to the fact that a heat dissipation structure is arranged in the containing cavity for heat dissipation are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack disconnecting unit, a battery pack and a vehicle. Background Art

[0002] The Battery Disconnect Unit (BDU) is a module in the Power Distribution Unit (PDU) of new energy vehicles. It is used to protect the battery in the battery pack of new energy vehicles. It is an important protection module in the high-voltage circuit system of electric vehicles and an important part of the vehicle control system of electric vehicles. Its function is to coordinate the function conversion and energy distribution of high-voltage accessories such as the drive motor control system, battery management system (BMS), charging management system, DC / DC converter (Direct Current converter), electric air conditioner, electric power steering, and braking system; in addition, it can also realize safety protection functions such as fast power-off protection for short-circuit overload and leakage protection. It makes car maintenance simpler, installation more convenient, beautifies the interior design and reduces the occupied space, makes the car battery life longer, and reduces the daily maintenance cost of the car.

[0003] With the development of new energy vehicles, users have higher and higher requirements for new energy vehicles, and the need to improve the performance of new energy vehicles requires increasing the charging and discharging power. However, the charging and discharging currents of new energy vehicles will also become larger and larger, which will also cause the heat generated by the battery pack to increase. In the limited space of the battery pack disconnect unit shell, the electrical components of the battery pack disconnect unit generate a lot of heat that cannot be discharged from the limited space, which causes the temperature of the electrical components of the battery pack disconnect unit to become higher and higher. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery pack disconnecting unit, a battery pack and a vehicle, wherein the heat dissipation part of the electrical component connector transfers heat with the external environment, so that a large amount of heat is discharged from a limited space.

[0005] According to the first aspect of the present invention, the battery pack disconnecting unit comprises: a housing, an electrical component and an electrical component connector. The housing has a receiving cavity, and a hollow area is provided on the housing, and the hollow area connects the receiving cavity and the external environment.

[0006] The electrical component is arranged in the accommodating cavity. The electrical component connector is arranged in the accommodating cavity and electrically connected to the electrical component, and the electrical component connector is provided with a heat dissipation part at the position of the hollow area, and the heat dissipation part exchanges heat with the outside of the housing by being exposed to the hollow area.

[0007] In this embodiment, the electrical component connector is provided with a heat dissipation part at the position of the hollow area. The heat dissipation part is exposed in the hollow area and exchanges heat with the outside of the shell. The large amount of heat generated by the electrical component during operation can be transferred to the heat dissipation part of the electrical component connector. The heat dissipation part of the electrical component connector then transfers heat to the external environment, so that a large amount of heat is discharged from the limited space. At the same time, the problem of increased cost and increased installation space of the accommodating cavity caused by setting a heat dissipation structure in the accommodating cavity for heat dissipation is avoided. Since the electrical connection end of the electrical component and the electrical connection position of the electrical component connector are too large in resistance, a large amount of heat will be generated. Based on this, the electrical connection end of the electrical component and the electrical connection position of the electrical component connector are set in the hollow area, which helps to quickly transfer heat from the hollow area to the external environment.

[0008] According to some embodiments of the utility model, the heat dissipation portion includes a bending section formed by bending the electrical component connector toward the position of the hollow area and extending in the hollow area, the orthographic projection of the bending section is located in the hollow area, wherein the heat dissipation portion is located in the hollow area, or / and the heat dissipation portion extends through the hollow area to the outside of the outer shell.

[0009] According to some embodiments of the present invention, the difference ΔT between the limit operating temperature Tmax and the actual operating temperature T of the electrical component is related to the surface area S of the bending section facing the external environment, ΔT=K2·S,

[0010] 0.5℃ / mm 2 ≤K2≤1℃ / mm 2 .

[0011] According to some embodiments of the present invention, a portion of the electrical component connector located in the hollow area is provided with an extension section, and an orthographic projection of the extension section is located in a portion of the housing within the hollow area that does not extend outside the housing.

[0012] According to some embodiments of the present invention, the contour of the portion of the electrical component connector located in the hollow area is adapted to the hollow area, so that the portion of the electrical component connector located in the hollow area is inserted and fitted with the hollow area.

[0013] According to some embodiments of the present invention, the ratio of the cross-sectional area of ​​the electrical component connector to the preset current on the electrical component connector is K1,5A / mm 2≤K1≤8A / mm 2 .

[0014] According to some embodiments of the present invention, a partition is provided in the accommodating cavity, and the partition divides the accommodating cavity into a plurality of mutually independent accommodating chambers.

[0015] According to an embodiment of the second aspect of the utility model, the battery pack comprises a heat sink and the battery pack disconnecting unit of the first aspect, the heat sink is arranged outside the housing, and heat is transferred between the heat dissipation portion and the heat sink.

[0016] According to some embodiments of the present invention, the electrical component includes an electrical connection end, the electrical connection end is arranged toward the hollow area, and the electrical connection position between the electrical connection end and the electrical component connector is located in the hollow area.

[0017] Wherein, the electrical component is perpendicular to the side of the shell provided with the hollow area, or the electrical component is inclined relative to the shell provided with the hollow area.

[0018] According to some embodiments of the present utility model, a thermally conductive mud layer is provided between the outer surface of the housing and the electrical component, and the thermally conductive mud layer is in contact with the electrical component connector and the heat sink.

[0019] A vehicle according to an embodiment of the third aspect of the utility model comprises the battery pack in the second aspect.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic diagram of a battery pack disconnecting unit according to an embodiment of the utility model when it is placed upright;

[0023] Figure 2 yes Figure 1 Exploded diagram of

[0024] Figure 3 is a schematic diagram of a battery pack disconnecting unit according to an embodiment of the utility model when placed upside down;

[0025] Figure 4 yes Figure 3 Exploded diagram of

[0026] Figure 5 yes Figure 4 A partial enlarged view of

[0027] Figure 6 This is a front view of a battery pack disconnecting unit according to an embodiment of the utility model without an upper housing;

[0028] Figure 7 is a schematic structural diagram of an upper housing according to an embodiment of the utility model;

[0029] Figure 8 is a schematic structural diagram of a protective cover according to an embodiment of the utility model;

[0030] Fig. 9 is a schematic structural diagram of another busbar according to an embodiment of the utility model;

[0031] Reference numerals:

[0032] Shell 10, upper shell 11, mounting groove 111, first insertion protrusion 1111, first buckle 1112, protective cover 112, first insertion groove 1121, first clamping groove 1122;

[0033] Lower housing 12, hollow area 1201, first accommodation chamber 121, second accommodation chamber 122, third accommodation chamber 123, fourth accommodation chamber 124, fifth accommodation chamber 125, sixth accommodation chamber 126, seventh accommodation chamber 127, eighth accommodation chamber 128, first boss 129a, second boss 129b, boss 129c, elastic sheet 129d;

[0034] The busbar 20, the first busbar 21, the bending section 211, the extension section 212, and the second busbar 22;

[0035] A first relay 31, a second relay 32, a third relay 33, a fourth relay 34, a fifth relay 35 and a sixth relay 36;

[0036] A first current sensor 41 and a second current sensor 42;

[0037] A battery pack disconnecting unit 100 . DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] The disclosure below provides many different embodiments or examples to realize different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0040] like Figure 1-Figure 9 As shown, a battery pack disconnecting unit 100 according to an embodiment of the first aspect of the utility model comprises: a housing 10, electrical components and electrical component connectors.

[0041] The housing 10 has a housing cavity, and a hollow area 1201 is provided on at least one side of the housing 10, and the hollow area 1201 connects the housing cavity with the external environment. The electrical component is arranged in the housing cavity. The electrical component connector is arranged in the housing cavity and electrically connected to the electrical component, and the electrical component connector is provided with a heat dissipation portion at the position of the hollow area 1201, and the heat dissipation portion exchanges heat with the outside of the housing 10 by being exposed to the hollow area 1201.

[0042] It should be noted that in practical applications, the battery pack disconnect unit 100, as a device for disconnecting and connecting high voltage electricity to the battery pack, plays a vital role in the safety of the battery pack and is a key component of the battery pack. The main function of the battery pack disconnect unit 100 is to control the power on and off of the battery pack, realize the energy distribution of the battery pack, and protect the electrical function safety.

[0043] The battery pack disconnecting unit 100 includes a housing 10, an electrical component and an electrical component connector. The housing 10 has a receiving cavity, and a hollow area 1201 is provided on the housing 10, and the hollow area 1201 connects the receiving cavity and the external environment. The electrical component is arranged in the receiving cavity. The electrical component connector is arranged in the receiving cavity and is electrically connected to the electrical component.

[0044] The electrical component connector may be a bus bar 20 , and the bus bar 20 may be a copper bus bar, an aluminum bus bar, or the like.

[0045] In one embodiment, the busbar 20 is provided with a heat dissipation portion, and the heat dissipation portion is located in the hollow area 1201 of the housing 10. In this way, a large amount of heat generated by the electrical components during operation can be transferred to the heat dissipation portion of the busbar 20. At this moment, the heat dissipation portion of the busbar 20 is located in the hollow area 1201, and the heat dissipation portion of the busbar 20 then transfers heat to the external environment, so that a large amount of heat is discharged from the limited space. At the same time, the problem of increased cost and increased installation space of the accommodating cavity caused by setting a heat dissipation structure in the accommodating cavity for heat dissipation is avoided.

[0046] In another embodiment, the busbar 20 is provided with a heat dissipation portion, and the heat dissipation portion extends through the hollow area 1201 to the external environment. In this way, a large amount of heat generated by the electrical components during operation can be transferred to the heat dissipation portion of the busbar 20, and the heat dissipation portion of the busbar 20 is currently located in the external environment. The heat dissipation portion of the busbar 20 then transfers heat to the external environment, so that a large amount of heat is discharged from the limited space. At the same time, the problem of increased cost and increased installation space of the accommodating cavity caused by setting a heat dissipation structure in the accommodating cavity for heat dissipation is avoided.

[0047] Of course, it is understandable that, in another embodiment, the heat dissipation portion of the busbar 20 is located in the hollow area 1201 , and the heat dissipation portion extends through the hollow area 1201 to the external environment.

[0048] To sum up, in this embodiment, the heat dissipation portion of the bus 20 is located in the hollow area 1201, or / and the heat dissipation portion extends through the hollow area 1201 to the external environment. A large amount of heat generated by the electrical components during operation can be transferred to the heat dissipation portion of the bus 20, and the heat dissipation portion of the bus 20 then transfers heat to the external environment, so that a large amount of heat is discharged from the limited space. At the same time, the problem of increased cost and increased installation space of the accommodating cavity caused by setting a heat dissipation structure in the accommodating cavity for heat dissipation is avoided.

[0049] In some embodiments of the utility model, the heat dissipation portion includes a bending section 211 formed by bending the electrical component connector toward the hollow area 1201 and extending in the hollow area 1201, and the orthographic projection of the bending section 211 is located in the hollow area 1201, wherein the heat dissipation portion is located in the hollow area 1201, or / and the heat dissipation portion extends through the hollow area 1201 to the outside of the housing 10.

[0050] In practical applications, the electrical components include relays and current sensors. The relays may be pre-charge relays and main negative relays. The relays have electrical connection terminals and bottom terminals. Figure 2 and Figure 4As shown, the electrical components include a first relay 31, a second relay 32, a third relay 33, a fourth relay 34, a fifth relay 35 and a sixth relay 36. The electrical connection ends of the first relay 31, the second relay 32, the third relay 33, the fourth relay 34 and the fifth relay 35 are connected to one end of the first bus 21, and the other end of the first bus 21 is connected to the first boss 129a in the accommodating cavity, as shown in FIG. Figure 6 shown.

[0051] The current sensor has an electrical connection end and a bottom end. Figure 2 and Figure 4 As shown, the electrical component includes a first current sensor 41 and a second current sensor 42. The electrical connection end of the first current sensor 41 is connected to one end of the second busbar 22, and the other end of the second busbar 22 is connected to the second boss 129b in the accommodating cavity. Figure 6 shown.

[0052] The first bus 21 is provided with a bending section 211 at the hollow area 1201. The orthographic projection of the bending section 211 is located at the hollow area 1201. The bending section 211 is the heat dissipation portion mentioned above. The bending section 211 bends toward the hollow area 1201. Figure 4 and Figure 5 As shown, the bending section 211 of the first busbar 21 can be in an inverted U-shape, and the bending section 211 protrudes from the hollow area 1201 and is arranged in the external environment. In this way, the contact area between the first busbar 21 and the external environment is increased as much as possible within the limited hollow area 1201, thereby improving the efficiency of heat transfer between the first busbar 21 and the external environment, which helps to transfer a large amount of heat generated by the relay to the external environment as soon as possible.

[0053] Of course, it is understandable that the bending section 211 of the first bus 21 can also be V-shaped, S-shaped, or other suitable shapes. This embodiment does not limit this. Technical personnel in this field can choose a suitable shape according to actual conditions as long as the contact area between the first bus 21 and the external environment is increased.

[0054] In detail, the first bus 21 between the second relay 32 and the fourth relay 34 is used as an example:

[0055] like Figure 5As shown, when the first busbar 21 is the first busbar 21a, the first busbar 21a is provided with an inverted U-shaped bending section 211a. The first busbar 21a is connected to the second relay 32 and the fourth relay 34 in sequence. The bending section 211a is located at the hollow area 1201a, and the bending section 211a protrudes from the hollow area 1201a, that is, the plane portion of the bending section 211a is located outside the opening of the hollow area 1201a toward the external environment, and there is a gap between the two. The plane portion of the bending section 211a is projected orthographically on the hollow area 1201a, and the orthographic projection of the plane portion of the bending section 211a completely overlaps with the hollow area 1201a.

[0056] In this way, the first bus bar 21a is adapted to the hollow area 1201a, and the first bus bar 21a can be inserted and matched with the hollow area 1201a to limit the horizontal freedom of the first bus bar 21a, so that the first bus bar 21a can be further stably arranged on the accommodating cavity of the shell 10.

[0057] The actual operating temperature of the second relay 32 and the fourth relay 34 is T, and the limit operating temperature of the second relay 32 and the fourth relay 34 is Tmax. When the actual operating temperature T is too high, it will affect the operation of the second and fourth relays. If the actual operating temperature is closer to the limit operating temperature Tmax, the surface area S of the bending section 211 facing the external environment (that is, the area S of the plane portion of the bending section 211a mentioned above) can be increased to improve the efficiency of heat transfer between the first bus 21a and the external environment, thereby reducing the temperature of the second and fourth relays to 120°C.

[0058] That is to say, the difference ΔT between the limit operating temperature Tmax of the electrical component and the actual operating temperature T is related to the surface area S of the bending section 211 in the hollow area 1201, ΔT = K2·S, 0.5°C / mm 2 ≤K2≤1℃ / mm 2 .

[0059] For example, in order to reduce the difference between the actual operating temperature of the second and fourth relays and the limit operating temperature Tmax by 0.5°C, the surface area S of the bent section 211 facing the external environment can be 1 mm 2 Alternatively, in order to reduce the difference between the actual operating temperature of the second and fourth relays and the limit operating temperature Tmax by 0.6°C, the surface area S of the bending section 211 facing the external environment may be 1mm 2 Alternatively, in order to reduce the difference between the actual operating temperature of the second and fourth relays and the limit operating temperature Tmax by 0.7°C, the surface area S of the bending section 211 facing the external environment may be 1mm 2; ..., in order to reduce the difference between the actual operating temperature of the second and fourth relays and the limit operating temperature Tmax by 1°C, the surface area S of the bending section 211 facing the external environment can be 1mm 2 This arrangement can ensure that the first busbar 21 can reduce the actual operating temperature of the relay to the maximum extent, so that each relay can work normally at a suitable temperature; on the other hand, it can avoid the first busbar 21 being too large or too small, thereby avoiding material waste or inappropriate heat transfer efficiency.

[0060] It should be noted that, in some embodiments, the actual operating temperature of the second relay 32 may be different from the actual operating temperature of the fourth relay 34. At the current moment, the lower actual operating temperature of the second relay 32 and the fourth relay 34 is related to the surface area S of the bending section 211 facing the external environment.

[0061] In addition, the ratio of the cross-sectional area of ​​the first busbar 21 to the preset current on the first busbar 21 is K1,5A / mm 2 ≤K1≤8A / mm 2 This arrangement can limit the heat generated by the resistor on the first bus bar 21 and prevent the heat from being too large.

[0062] In some embodiments of the utility model, the portion of the bus 20 located in the hollow area 1201 is provided with an extension section 212, and the orthographic projection of the extension section 212 is located in the portion of the hollow area 1201 of the outer shell 10 that does not extend outside the outer shell 10, that is, the orthographic projection of the extension section 212 is located in the portion of the outer shell 10 except the hollow area 1201, and the extension section 212 is a heat dissipation portion.

[0063] In detail, the first busbar 21 between the first relay 31 and the third relay 33 is used as an example:

[0064] like Fig. 9 As shown, when the first busbar 21 is the first busbar 21b, the first busbar 21b is connected to the first relay 31 and the third relay 33 in sequence, and the first busbar 21b is provided with an extension section 212, as shown in FIG. Fig. 9 The extension section 212 is projected on the housing 10, and the projection area of ​​the extension section 212 on the housing 10 does not overlap with the hollow area 1201 on the housing 10. In this way, the contact area between the first bus bar 21b and the external environment is increased by setting the extension section 212, so as to improve the efficiency of heat transfer between the first bus bar 21b and the external environment, thereby reducing the temperature of the first and third relays to their operating temperature.

[0065] In some embodiments of the present invention, the battery pack disconnecting unit 100 further includes a heat sink (not shown). The heat sink is disposed outside the accommodating cavity, and the heat dissipating portion is connected to the heat sink in a heat transfer manner.

[0066] It should be noted that in the related art, in order to reduce the temperature of the electrical components, it is necessary to dissipate heat by arranging a heat sink in the accommodating cavity, which will occupy the installation space of the accommodating cavity, resulting in difficulty in arranging the various electrical components, or increase the size of the housing 10. However, this embodiment avoids the difficulty in arranging the various electrical components by arranging the heat sink outside the accommodating cavity, and at the same time, contributes to the miniaturization design of the housing 10.

[0067] Specifically, Figure 3 and Figure 4 As shown, the housing 10 has a first housing wall, and the first housing wall is provided with the above-mentioned hollow area 1201. The first housing wall is also the housing 10 provided with the hollow area 1201, and the first housing wall here can be the bottom of the accommodating cavity. The heat sink is arranged on the outer surface of the first housing wall, and the electrical connection end of the electrical component is arranged toward the hollow area 1201, and the electrical connection position between the electrical connection end of the electrical component and the first bus 21 is located in the hollow area 1201. In one embodiment, the electrical component is perpendicular to the first housing wall, that is, the direction from the electrical connection end of the electrical component to its bottom end is perpendicular to the first housing wall; in another embodiment, the electrical component is arranged obliquely relative to the first housing wall, that is, the direction from the electrical connection end of the electrical component to its bottom end can be at an acute angle to the first housing wall.

[0068] Since the electrical connection position between the electrical connection end of the electrical component and the first bus 21 has too large resistance, a large amount of heat will be generated. Based on this, the electrical connection position between the electrical connection end of the electrical component and the first bus 21 is set in the hollow area 1201, which helps to quickly transfer heat from the hollow area 1201 to the external environment.

[0069] Furthermore, a heat-conducting mud layer (not shown) is arranged between the outer surface of the first shell wall and the electrical component, and the heat-conducting mud layer is in contact with the first bus bar 21 and the heat sink. In this arrangement, on the one hand, the gap between the hollow area 1201 and the first bus bar 21 is filled by the heat-conducting mud layer, thereby improving the sealing performance of the shell 10, and on the other hand, the heat-conducting mud layer increases the contact area between the first bus bar 21 and the external environment, which helps to improve the efficiency of heat transfer between the first bus bar 21 and the external environment.

[0070] In some embodiments of the utility model, there are multiple electrical components, and a partition is provided in the accommodating cavity, which divides the accommodating cavity into multiple independent accommodating chambers. The accommodating chambers correspond to the electrical components one by one, and one electrical component is arranged in each accommodating chamber.

[0071] like Figure 6As shown, the partition divides the storage cavity into a plurality of mutually independent storage chambers, and the storage cavity is provided with a first storage chamber 121, a second storage chamber 122, a third storage chamber 123, a fourth storage chamber 124, a fifth storage chamber 125, a sixth storage chamber 126, a seventh storage chamber 127 and an eighth storage chamber 128. The first storage chamber 121 to the eighth storage chamber 128 are mutually independent.

[0072] The first current sensor 41 is located in the first storage chamber 121, and the second current sensor 42 is located in the eighth storage chamber 128. The first relay 31 is located in the second storage chamber 122, the second relay 32 is located in the third storage chamber 123, the third relay 33 is located in the fourth storage chamber 124, the fourth relay 34 is located in the fifth storage chamber 125, the fifth relay 35 is located in the sixth storage chamber 126, and the sixth relay 36 is located in the seventh storage chamber 127. In this way, there is a distance between each current sensor and each relay, avoiding heat transfer between the current sensor and the relay, and avoiding heat transfer between two adjacent relays.

[0073] In some embodiments of the present invention, Figure 2 and Figure 4 As shown, the housing 10 includes an upper shell 11 and a lower shell 12, and the upper shell 11 and the lower shell 12 are detachably connected, and the upper shell 11 and the lower shell 12 can be plugged into each other, or snap-fitted together, or other suitable methods are used between the upper shell 11 and the lower shell 12, which is not limited in this embodiment.

[0074] Furthermore, a mounting groove 111 is provided on the upper shell 11 , and the mounting groove 111 is detachably connected to the protective cover 112 .

[0075] Specifically, Figure 7 and Figure 8 As shown, there are four mounting grooves 111 on the upper shell 11, and the mounting grooves 111 are arranged one by one with the protective cover 112. Among them, some mounting grooves 111 can correspond to the other end of the first bus 21 connected to the first boss 129a in the accommodating cavity; other mounting grooves 111 can correspond to the other end of the second bus 22 connected to the second boss 129b in the accommodating cavity.

[0076] The mounting groove 111 is provided with a first insertion protrusion 1111 and a first buckle 1112. Correspondingly, the protective cover 112 is provided with a first insertion groove 1121 and a first buckle 1122. The first insertion groove 1121 and the first insertion protrusion 1111 can be inserted and connected, and the first buckle 1122 and the first buckle 1112 can be buckled and connected. In this way, the protective cover 112 abuts against the surface of the first and second busbars 20, forming a reliable anti-opening and anti-dropping function, thereby improving the safety and reliability of the battery pack disconnecting unit 100.

[0077] In some embodiments of the present invention, the accommodating cavity is provided with a mounting portion, and the electrical component is detachably connected to the mounting portion.

[0078] like Figure 6 As shown, the first current sensor 41 is located in the first accommodation chamber 121, and the first current sensor 41 is connected to the second boss 129b by a fastener. The third relay 33 is located in the fourth accommodation chamber 124, and the fourth relay 34 is located in the fifth accommodation chamber 125. At the same time, the third relay 33 is connected to the boss 129c by a fastener, and the fourth relay 34 is connected to another boss 129c by a fastener; the sixth relay 36 is located in the seventh accommodation chamber 127, and the sixth relay 36 is fixed in the seventh accommodation chamber 127 by an elastic sheet 129d.

[0079] A battery pack according to an embodiment of the second aspect of the present invention includes the battery pack disconnecting unit 100 in the first aspect. The battery pack has the advantages of the battery pack disconnecting unit 100, so they are not described in detail.

[0080] A vehicle according to an embodiment of the third aspect of the present invention comprises the battery pack in the second aspect. The vehicle has the advantages of the battery pack, so they are not described in detail.

[0081] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0082] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0083] In the description of the present invention, "plurality" means two or more.

[0084] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0085] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", "some examples", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0087] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack disconnect unit, characterized in that: include: A shell, wherein the shell has a receiving cavity, and the shell is provided with a hollow area on at least one side, wherein the hollow area communicates with the receiving cavity and the external environment; An electrical component, wherein the electrical component is disposed in the accommodating cavity; An electrical component connector is disposed in the accommodating cavity and electrically connected to the electrical component. The electrical component connector is provided with a heat dissipation portion at the position of the hollow area. The heat dissipation portion exchanges heat with the outside of the shell by being exposed to the hollow area.

2. The battery pack disconnect unit according to claim 1, characterized in that: The heat dissipation portion includes a bending section formed by bending the electrical component connector toward the hollow area and extending in the hollow area, the orthographic projection of the bending section is located in the hollow area, wherein the heat dissipation portion is located in the hollow area, or / and the heat dissipation portion extends through the hollow area to the outside of the housing.

3. The battery pack disconnect unit according to claim 2, characterized in that: The difference △T between the limit working temperature Tmax and the actual working temperature T of the electrical component is related to the surface area S of the bending section in the hollow area, △T = K2·S, 0.5℃ / mm 2 ≤K2≤1℃ / mm 2 .

4. The battery pack disconnect unit according to claim 1, characterized in that: The heat dissipation portion includes a partial extension section of the electrical component connector located in the hollow area, and an orthographic projection of the extension section is located in a portion of the housing that is not extended outside the housing and is located in the hollow area of ​​the housing.

5. The battery pack disconnecting unit according to claim 2 or 4, characterized in that: The contour of the portion of the electrical component connector located in the hollow area is matched with the hollow area, so that the portion of the electrical component connector located in the hollow area is inserted and matched with the hollow area.

6. The battery pack disconnecting unit according to any one of claims 1 to 4, characterized in that: The ratio of the cross-sectional area of ​​the electrical component connector to the preset current on the electrical component connector is K1. 5A / mm 2 ≤K1≤8A / mm 2 。 7. The battery pack disconnecting unit according to any one of claims 1 to 4, characterized in that: A partition is arranged in the accommodating cavity, and the partition divides the accommodating cavity into a plurality of mutually independent accommodating chambers.

8. A battery pack, characterized in that: It comprises a heat sink and a battery pack disconnecting unit according to any one of claims 1 to 7, wherein the heat sink is arranged outside the housing, and heat is transferred between the heat sink and the heat sink.

9. The battery pack according to claim 8, characterized in that: The electrical component comprises an electrical connection end, the electrical connection end is arranged toward the hollow area, and the electrical connection position between the electrical connection end and the electrical component connector is located in the hollow area. Wherein, the electrical component is perpendicular to the side of the shell provided with the hollow area, or the electrical component is inclined relative to the shell provided with the hollow area.

10. The battery pack according to claim 8, characterized in that: A heat-conducting mud layer is arranged between the outer surface of the shell and the electrical component, and the heat-conducting mud layer is in contact with the electrical component connector and the heat sink.

11. A vehicle, characterized in that: A battery pack comprising any one of claims 8-10.

Images