Power battery disconnect unit, battery pack and vehicle

Abstract

The utility model discloses a power battery cut-off unit, a battery pack and a vehicle, wherein the power battery cut-off unit comprises a first electrical component, a second electrical component, a first copper bar and a second copper bar, wherein the heat generation of the second electrical component is higher than the heat generation of the first electrical component, the two ends of the first copper bar are respectively electrically connected to a terminal of the first electrical component and a terminal of the second electrical component, and one end of the second copper bar is electrically connected to another terminal of the first electrical component, wherein the minimum cross-sectional area of ​​the first copper bar is greater than the maximum cross-sectional area of ​​the second copper bar. The power battery cut-off unit provided by the utility model has the advantages of low cost for adjusting the temperature difference between the two ends of the first electrical component and long service life of the first electrical component.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a power battery cut-off unit, a battery pack and a vehicle. Background Art

[0002] In order to meet the user's intense driving conditions, the temperature rise of all components in the battery pack must not exceed the allowable temperature of each component. For example, the battery cells and BDU (Battery Disconnect Unit) can be cooled by a liquid cooling plate. However, cooling the BDU by a liquid cooling plate will result in high BDU manufacturing costs and will not allow accurate heat dissipation of the electrical components in the BDU. The electrical components still have defects in their performance due to the large temperature difference between the two ends. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the utility model provides a power battery cut-off unit, which has the advantages of low cost for adjusting the temperature difference between two ends of a first electrical component and long service life of the first electrical component.

[0005] An embodiment of the present invention further provides a battery pack.

[0006] An embodiment of the present utility model further provides a vehicle.

[0007] According to an embodiment of the utility model, the power battery cut-off unit includes a first electrical component, a second electrical component, a first copper bar and a second copper bar, wherein the heat generated by the second electrical component is higher than the heat generated by the first electrical component; two ends of the first copper bar are electrically connected to one terminal of the first electrical component and one terminal of the second electrical component, respectively; one end of the second copper bar is electrically connected to the other terminal of the first electrical component; wherein the minimum cross-sectional area of ​​the first copper bar is greater than the maximum cross-sectional area of ​​the second copper bar.

[0008] According to the power battery cut-off unit of the embodiment of the utility model, the heat generated by the second electrical device is higher than that of the first electrical device. By setting the minimum cross-sectional area of ​​the first copper bar connecting the first electrical device and the second electrical device to be larger than the maximum cross-sectional area of ​​the second copper bar connected to the other terminal of the first electrical device, the heat dissipation effect of the first copper bar is better than that of the second copper bar, thereby effectively avoiding the heat generated by the second electrical device from being transferred from the first copper bar to the first electrical device, resulting in excessive temperature difference between the two ends of the first electrical device, and effectively improving the service life and performance of the first electrical device. Moreover, the above effect can be achieved by simply adjusting the cross-sectional area of ​​the first copper bar or the second copper bar, effectively reducing the cost of adjusting the temperature difference between the two ends of the first electrical device.

[0009] In some embodiments, the difference between the minimum cross-sectional area of ​​the first copper bar and the maximum cross-sectional area of ​​the second copper bar is d, where 20 mm 2 ≤d≤50mm 2 .

[0010] In some embodiments, a minimum width of the first copper bar is greater than a maximum width of the second copper bar.

[0011] In some embodiments, the first electrical device comprises a fuse and the second electrical device comprises a main positive relay;

[0012] And / or, the first electrical device includes a shunt, and the second electrical device includes a main negative relay.

[0013] In some embodiments, at least one of the first copper bar and the second copper bar includes at least two connecting portions arranged along a length direction, and the length directions of any two adjacent connecting portions form an angle.

[0014] In some embodiments, the first electrical device includes a shunt, and the power battery disconnection unit further includes a heat sink, and the heat sink is bonded and connected to the bottom surface of the shunt.

[0015] In some embodiments, a first temperature sensor is installed on the first copper busbar, and / or a second temperature sensor is installed on the second copper busbar.

[0016] In some embodiments, the power battery cut-off unit also includes a shell, the first electrical component and the second electrical component are installed in the shell, and the shell is provided with a plurality of heat dissipation holes, at least one of the heat dissipation holes is arranged opposite to the first electrical component, and at least one of the heat dissipation holes is arranged opposite to the second electrical component.

[0017] The battery pack according to the embodiment of the present invention includes the power battery disconnection unit as described in any of the above embodiments.

[0018] The technical advantages of the battery pack according to the embodiment of the utility model are the same as the technical advantages of the power battery disconnection unit of the above-mentioned embodiment, which will not be repeated here.

[0019] The vehicle according to the embodiment of the present utility model includes the battery pack as described in the above embodiment.

[0020] The technical advantages of the vehicle according to the embodiment of the utility model are the same as the technical advantages of the battery pack in the above-mentioned embodiment, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a power battery disconnection unit according to an embodiment of the utility model.

[0022] Figure 2 It is an exploded view of a power battery cut-off unit according to an embodiment of the utility model.

[0023] Figure 3 It is a top view of a power battery cut-off unit according to an embodiment of the utility model, wherein the upper shell is hidden.

[0024] Figure 4 It is a bottom view of the power battery cut-off unit according to an embodiment of the utility model, wherein the lower shell is hidden.

[0025] Figure 5 It is a schematic diagram of a shunt and a radiator in a power battery disconnection unit according to an embodiment of the utility model.

[0026] Reference numerals:

[0027] 1. Shell; 11. Upper shell; 12. Lower shell; 13. First heat dissipation hole; 2. Fuse; 3. Main positive relay; 4. Main negative relay; 5. Shunt; 6. Copper busbar assembly; 61. First copper busbar; 62. Second copper busbar; 7. First temperature sensor; 9. Wiring harness; 10. Radiator. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0029] In the power battery disconnection unit in the related art, the relay is the main heat source, and the heat generated by the first electrical device (fuse and shunt) connected to the relay is lower than the heat generated by the relay. Therefore, the heat received by the copper busbars connected to the two terminals of the first electrical device is prone to have a large deviation. In the related art, the two copper busbars connected to the two terminals of the first electrical device have the same cross-sectional area and basically the same heat dissipation effect. This setting leads to a large temperature difference between the two ends of the first electrical device, which in turn affects the performance and service life of the first electrical device.

[0030] In order to solve the above defects, the following Figure 1-Figure 5 A power battery disconnection unit according to an embodiment of the utility model is described.

[0031] The power battery cut-off unit according to the embodiment of the utility model comprises a first electrical component, a second electrical component, a first copper bar 61 and a second copper bar 62, the heat generation of the second electrical component is higher than the heat generation of the first electrical component, the two ends of the first copper bar are respectively electrically connected to one terminal of the first electrical component and one terminal of the second electrical component, and one end of the second copper bar is electrically connected to the other terminal of the first electrical component. The minimum cross-sectional area of ​​the first copper bar is greater than the maximum cross-sectional area of ​​the second copper bar.

[0032] According to the power battery cut-off unit of the embodiment of the utility model, the heat generated by the second electrical device is higher than that of the first electrical device. By setting the minimum cross-sectional area of ​​the first copper bar 61 connecting the first electrical device and the second electrical device to be larger than the maximum cross-sectional area of ​​the second copper bar 62 connected to the other terminal of the first electrical device, the first copper bar 61 has a better heat dissipation effect than the second copper bar 62, thereby effectively avoiding the heat generated by the second electrical device from being transferred from the first copper bar 61 to the first electrical device, resulting in excessive temperature difference between the two ends of the first electrical device, and effectively improving the service life and performance of the first electrical device. Moreover, the above effect can be achieved by simply adjusting the cross-sectional area of ​​the first copper bar 61 or the second copper bar 62, effectively reducing the cost of adjusting the temperature difference between the two ends of the first electrical device.

[0033] It should be noted that the cross section of the first copper bar 61 is a plane perpendicular to the extending direction of the first copper bar 61 , and the cross section of the second copper bar 62 is a plane perpendicular to the extending direction of the second copper bar 62 .

[0034] In some embodiments, the difference between the minimum cross-sectional area of ​​the first copper bar 61 and the maximum cross-sectional area of ​​the second copper bar 62 is d, where 20 mm 2 ≤d≤50mm 2 .

[0035] That is, on the basis of maintaining the original ratio (such as between 1.2 and 2) of the length of the second copper bar 62 to the length of the first copper bar 61, by setting d ≥ 20 mm 2 , it can ensure that the heat dissipation efficiency of the first copper bar 61 is greater than that of the second copper bar 62, so as to reduce the temperature difference between the two terminals of the first electrical device and ensure the service life and performance of the first electrical device. By setting d≤50mm 2 On the one hand, it ensures that the heat dissipation efficiency of the first copper bar 61 does not exceed the heat dissipation efficiency of the second copper bar 62 too much, causing the temperature of the first copper bar 61 to be lower than the temperature of the second copper bar 62; on the other hand, it avoids the first copper bar 61 occupying too much space and affecting the structural compactness of the power battery cut-off unit.

[0036] For example, the difference between the minimum cross-sectional area of ​​the first copper bar 61 and the maximum cross-sectional area of ​​the second copper bar 62 is 20 mm. 2, so that the heat dissipation efficiency of the first copper bar 61 is greater than that of the second copper bar 62, thereby reducing the temperature of the terminal of the first electrical device connected to the first copper bar 61 to the temperature of the terminal closer to the first electrical device connected to the second copper bar 62, effectively ensuring the service life and performance of the first electrical device. At the same time, this arrangement makes the first copper bar 61 occupy less space, and the space utilization rate in the power battery disconnection unit is higher.

[0037] For example, the difference between the minimum cross-sectional area of ​​the first copper bar 61 and the maximum cross-sectional area of ​​the second copper bar 62 is 35 mm 2 Compared with the above example, this setting can make the temperature difference between the terminal of the first electrical device connected to the first copper bus 61 and the terminal of the first electrical device connected to the second copper bus 62 smaller, and the service life and performance of the first electrical device are higher.

[0038] For example, the difference between the minimum cross-sectional area of ​​the first copper bar 61 and the maximum cross-sectional area of ​​the second copper bar 62 is 50 mm 2 , thereby effectively reducing the risk of heat generated by the second electrical component being transferred to the first electrical component through the first copper bus 61, further ensuring the service life and performance of the first electrical component.

[0039] In some embodiments, Figure 2 and Figure 3 As shown, the minimum width of the first copper bar 61 is greater than the maximum width of the second copper bar 62 .

[0040] By adjusting the minimum width of the first copper bar 61 to be larger than the maximum width of the second copper bar 62, the minimum cross-sectional area of ​​the first copper bar 61 is larger than the maximum cross-sectional area of ​​the second copper bar 62, and the cross-sectional areas of the first copper bar 61 and the second copper bar 62 are adjusted simply and conveniently.

[0041] For example, the cross-section of the first copper bar 61 and the second copper bar 62 is a rectangle, and the thickness of the first copper bar 61 and the second copper bar 62 (i.e., the width of the rectangle) is equal. At this time, the width of the first copper bar 61 (i.e., the length of the rectangle) is greater than the width of the second copper bar 62, which means that the heat dissipation area of ​​the first copper bar 61 is greater than the heat dissipation area of ​​the second copper bar 62, and the heat dissipation efficiency of the first copper bar 61 is higher than that of the second copper bar 62. At this time, the design of the first copper bar 61 and the second copper bar 62 being equal in thickness allows the first copper bar 61 and the second copper bar 62 to be cut and formed on a copper plate of the same thickness, and the design and production costs of the first copper bar 61 and the second copper bar 62 are low.

[0042] It should be noted that the thickness of the first copper bar 61 may also be different from the thickness of the second copper bar 62. For example, if the thickness of the first copper bar 61 is greater than the thickness of the second copper bar 62, the difference between the minimum width of the first copper bar 61 and the maximum width of the second copper bar 62 can be designed to be smaller, and the first copper bar 61 and the second copper bar 62 occupy less space in their respective width directions, thereby achieving higher space utilization in the power battery cut-off unit.

[0043] In some embodiments, Figure 2 and Figure 3 As shown, the first electrical device includes a fuse 2, the second electrical device includes a main positive relay 3, and the fuse 2 is electrically connected to the positive electrode of the battery through a second copper bar 62. Therefore, by setting the heat dissipation efficiency of the first copper bar 61 connecting the fuse 2 and the main positive relay 3 to be higher than the heat dissipation efficiency of the second copper bar 62 connected to the other terminal of the fuse 2, the temperature difference between the two terminals of the fuse 2 is effectively reduced, and the performance and service life of the fuse 2 are effectively guaranteed.

[0044] And / or, the first electrical device includes a shunt 5, the second electrical device includes a main negative relay 4, and the shunt 5 is electrically connected to the negative electrode of the battery through a second copper bar 62. Therefore, by setting the heat dissipation efficiency of the first copper bar 61 connecting the shunt 5 and the main negative relay 4 to be higher than the heat dissipation efficiency of the second copper bar 62 connected to the other terminal of the shunt 5, the temperature difference between the two terminals of the shunt 5 is effectively reduced, and the performance and service life of the shunt 5 are effectively guaranteed.

[0045] For example, the first electrical device in the power battery disconnection unit includes a fuse 2, and the second electrical device includes a main positive relay 3. Alternatively, the first electrical device in the power battery disconnection unit includes a shunt 5, and the second electrical device includes a main negative relay 4. Alternatively, the first electrical device in the power battery disconnection unit includes a fuse 2 and a shunt 5, and the second electrical device includes a main positive relay 3 and a main negative relay 4, respectively.

[0046] Specifically, Figure 3 As shown, the fuse 2 and the main positive relay 3 are arranged at intervals along the length direction of the power battery disconnection unit, the terminal of the fuse 2 adjacent to the main positive relay 3 is connected to the first copper bar 61, and the terminal of the fuse 2 away from the main positive relay 3 is connected to the second copper bar 62. The main negative relay 4 and the shunt 5 are arranged at intervals along the length direction of the power battery disconnection unit, the terminal of the shunt 5 adjacent to the main negative relay 4 is connected to the first copper bar 62, and the terminal of the shunt 5 away from the main negative relay 4 is connected to the second copper bar 62.

[0047] In some embodiments, at least one of the first copper bar 61 and the second copper bar 62 includes at least two connecting portions arranged along the length direction, and the length directions of any two adjacent connecting portions form an angle.

[0048] Among them, the angle between the length directions of any two adjacent connecting parts can be any one of an acute angle, a right angle and an obtuse angle. Compared with the consistency of the length directions of the two adjacent connecting parts, the above arrangement can increase the length of at least one of the first copper bar 61 and the second copper bar 62 within the effective space, thereby increasing the heat dissipation area of ​​at least one of the first copper bar 61 and the second copper bar 62, thereby making the temperature at the two terminals of the first electrical device lower, thereby making the first electrical device have better performance and longer service life. For example, when the first electrical device is a shunt 5, the current sampling accuracy of the shunt 5 can be made higher.

[0049] Specifically, Figure 2 and Figure 3 As shown, the first copper bar 61 and the second copper bar 62 connected to the fuse 2 each include three connecting parts, and the length directions of any two adjacent connecting parts are perpendicular. The plane where the middle connecting part is located is perpendicular to the plane where the other connecting parts are located. The second copper bar 62 connected to the diverter 5 includes two connecting parts, and the planes where the two connecting parts are located are coplanar.

[0050] It should be noted that the first copper busbar 61 may also include other numbers of connection parts, such as two or four connection parts, and the two adjacent connection parts may also be acute angles or obtuse angles, and the two adjacent connection parts may be in the same horizontal plane or arranged in the height direction. Similarly, the second copper busbar 62 may also include other numbers of connection parts, such as four or five connection parts, and the two adjacent connection parts may also be acute angles or obtuse angles, and the two adjacent connection parts may be in the same horizontal plane or arranged in the height direction.

[0051] In some embodiments, Figure 4 and Figure 5 As shown, the first electrical device includes a shunt 5 , and the power battery disconnection unit further includes a heat sink 10 , and the heat sink 10 is bonded and connected to the bottom surface of the shunt 5 .

[0052] The heat sink 10 is in contact with the bottom surface of the shunt 5, and the heat generated by the shunt 5 can be quickly discharged through the heat sink 10, thereby improving the heat dissipation efficiency of the shunt 5, thereby effectively reducing the operating temperature of the shunt 5, and the current sampling accuracy of the shunt 5 is higher.

[0053] Specifically, Figure 5 As shown, the radiator 10 is located below the diverter 5, the top surface of the radiator 10 is larger than the bottom surface of the diverter 5, and the top surface of the radiator 10 completely covers the top surface of the diverter 5. The radiator 10 is connected and abutted with the diverter 5 by bolts, and the radiator 10 includes a plurality of heat dissipation fins arranged at intervals. At this time, based on the limited space in the housing 1, the heat dissipation area of ​​the radiator 10 is further increased, thereby further improving the heat dissipation efficiency of the diverter 5.

[0054] Alternatively, when the power battery disconnection unit is placed horizontally, the radiator 10 may also be located on the side of the diverter 5, and the bottom surface of the diverter 5 faces the side of the radiator 10 and is in close contact with the side of the radiator 10. Alternatively, when the power battery disconnection unit is placed horizontally, the radiator 10 may also be located above the diverter 5, the diverter 5 is inverted, and the bottom surface of the diverter 5 is in close contact with the bottom surface of the radiator 10.

[0055] In some embodiments, Figure 3 As shown, a first temperature sensor 7 is mounted on the first copper bus 61 .

[0056] By arranging the first temperature sensor 7 on the first copper busbar 61, the temperature of the first copper busbar 61 can be collected in real time, and the temperature of the first electrical component and the second electrical component can also be indirectly detected, thereby realizing real-time judgment of the states of the first electrical component and the second electrical component, effectively avoiding aging and failure of the first electrical component and the second electrical component due to excessive temperature, and effectively ensuring the working performance of the power battery cut-off unit.

[0057] And / or, a second temperature sensor is installed on the second copper bar 62. The second temperature sensor can collect the temperature of the second copper bar 62 in real time, and then can indirectly detect the temperature of the first electrical component, thereby realizing real-time judgment of the state of the first electrical component, effectively avoiding aging and failure of the first electrical component due to excessive temperature, and effectively ensuring the working performance of the power battery cut-off unit.

[0058] For example, Figure 3 As shown, there are two first temperature sensors 7 and they are electrically connected to the vehicle controller through a wiring harness 9. One of the first temperature sensors 7 is installed at the connection between the first copper bar 61 and the fuse 2, and the other first temperature sensor 7 is installed at the connection between the first copper bar 61 and the main negative relay 4.

[0059] By way of example, there are two second temperature sensors, which are respectively mounted on two second copper bars 62 .

[0060] For example, the power battery disconnection unit includes two first temperature sensors 7 and two second temperature sensors, the two first temperature sensors 7 are respectively mounted on two first copper bars 61, and the two second temperature sensors are respectively mounted on two second copper bars 62. This arrangement can more accurately detect the temperature of the first electrical device and the second electrical device, and better ensure the working performance of the power battery disconnection unit.

[0061] In some embodiments, Figure 1 As shown, the power battery disconnection unit also includes a shell 1, in which the first electrical component and the second electrical component are installed. The shell 1 is provided with a plurality of heat dissipation holes, at least one heat dissipation hole is arranged opposite to the first electrical component, and at least one heat dissipation hole is arranged opposite to the second electrical component.

[0062] The heat dissipation holes realize direct connection between the chamber inside the shell 1 and the outside world, effectively improving the heat exchange efficiency between the chamber inside the shell 1 and the outside world, thereby effectively reducing the temperature of the fuse 2, the main positive relay 3, the main negative relay 4 and the shunt 5, and ensuring the working performance of the power battery cut-off unit.

[0063] Specifically, there are multiple heat dissipation holes and they are formed by a hollow design. There are always some heat dissipation holes on the shell 1 that are opposite to each of the fuse 2, the main positive relay 3, the main negative relay 4 and the shunt 5, so as to achieve precise heat dissipation for each of the fuse 2, the main positive relay 3, the main negative relay 4 and the shunt 5.

[0064] In some embodiments, Figure 1-Figure 4 As shown, the housing 1 includes an upper shell 11 and a lower shell 12 , the heat dissipation holes include first heat dissipation holes 13 arranged in the upper shell 11 , and / or the heat dissipation holes include second heat dissipation holes arranged in the lower shell 12 .

[0065] The upper shell 11 and the lower shell 12 are detachably connected to facilitate installation of electrical components such as the fuse 2 , the main positive relay 3 , the main negative relay 4 and the shunt 5 in the shell 1 .

[0066] Specifically, the upper shell 11 and the lower shell 12 are respectively provided with a first heat dissipation hole 13 and a second heat dissipation hole. The design of the first heat dissipation hole 13 and the second heat dissipation hole realizes the synchronous heat dissipation of each of the fuse 2, the main positive relay 3, the main negative relay 4 and the shunt 5 on the upper and lower sides, thereby achieving a better heat dissipation and cooling effect on the fuse 2, the main positive relay 3, the main negative relay 4 and the shunt 5.

[0067] The battery pack according to the embodiment of the present utility model includes a power battery disconnection unit as described in any of the above embodiments.

[0068] The technical advantages of the battery pack according to the embodiment of the utility model are the same as the technical advantages of the power battery disconnection unit of the above-mentioned embodiment, which will not be repeated here.

[0069] A vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0070] The technical advantages of the vehicle according to the embodiment of the utility model are the same as the technical advantages of the battery pack in the above-mentioned embodiment, which will not be repeated here.

[0071] 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.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0076] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A power battery disconnection unit, characterized in that: include: a first electrical device; a second electrical device, the second electrical device generating a greater amount of heat than the first electrical device; a first copper busbar, wherein two ends of the first copper busbar are electrically connected to a terminal of the first electrical device and a terminal of the second electrical device respectively; a second copper busbar, one end of which is electrically connected to another terminal of the first electrical device; The minimum cross-sectional area of ​​the first copper busbar is greater than the maximum cross-sectional area of ​​the second copper busbar.

2. The power battery disconnection unit according to claim 1, characterized in that: The difference between the minimum cross-sectional area of ​​the first copper bar and the maximum cross-sectional area of ​​the second copper bar is d, where 20mm 2 ≤d≤50mm 2 .

3. The power battery disconnection unit according to claim 1, characterized in that: The minimum width of the first copper bar is greater than the maximum width of the second copper bar.

4. The power battery disconnection unit according to claim 1, characterized in that: The first electrical device comprises a fuse, and the second electrical device comprises a main positive relay; And / or, the first electrical device includes a shunt, and the second electrical device includes a main negative relay.

5. The power battery disconnection unit according to claim 1, characterized in that: At least one of the first copper bar and the second copper bar includes at least two connecting parts arranged along the length direction, and the length directions of any two adjacent connecting parts form an angle.

6. The power battery disconnection unit according to claim 1, characterized in that: The first electrical component includes a shunt, and the power battery cut-off unit also includes a heat sink, which is bonded and connected to the bottom surface of the shunt.

7. The power battery disconnection unit according to claim 1, characterized in that: A first temperature sensor is installed on the first copper busbar, and / or a second temperature sensor is installed on the second copper busbar.

8. The power battery disconnection unit according to claim 1, characterized in that: The power battery cut-off unit also includes a shell, the first electrical component and the second electrical component are installed in the shell, and a plurality of heat dissipation holes are provided on the shell, at least one of the heat dissipation holes is arranged opposite to the first electrical component, and at least one of the heat dissipation holes is arranged opposite to the second electrical component.

9. A battery pack, characterized in that: It comprises a power battery disconnection unit as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

Images