Battery pack circuit breaking unit, battery pack and vehicle

Abstract

The utility model discloses a battery pack circuit breaking unit, battery pack and vehicle, the battery pack circuit breaking unit comprises a heating element and a semiconductor cooler, the semiconductor cooler has a cold end and a hot end, the surface of the cold end back to the hot end is attached and connected with the surface of the heating element. According to the battery pack circuit breaking unit, the surface, opposite to the hot end, of the cold end of the semiconductor cooler is attached to and connected with the surface of the heating element, so that the cold end can absorb heat of the heating element and transmit the heat to the hot end of the semiconductor cooler, and cooling and heat dissipation of the heating element are achieved. The semiconductor cooler has the characteristics of light weight, small size and no need of using a liquid cooling medium, so that the battery pack circuit breaking unit is light in weight, small in size and good in safety.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a battery pack disconnection unit, a battery pack and a vehicle. Background Art

[0002] At present, new energy vehicles are all developing towards large battery capacity and high-rate fast charging. The resulting problem is that the charging current is large, which poses a huge challenge to the heat dissipation of the entire vehicle's high-voltage system. Especially as the BDU (Battery Disconnect Unit) that undertakes the energy distribution and high-voltage on / off of the entire high-voltage system, when carrying a large current, the heat accumulated in electrical components such as copper bars, relays, and fuses in the battery pack disconnection unit cannot be dissipated in time, resulting in overheating of the battery pack disconnection unit and even safety accidents such as thermal runaway.

[0003] In related technologies, the copper bar of the battery pack disconnection unit relies on the circulation of a liquid cooling medium for heat dissipation. The weight and occupied space of the liquid cooling medium are relatively large, and there is a relatively high risk of leakage, which leads to problems such as large weight, large volume, and poor safety of the battery pack disconnection unit. Summary of the Utility Model

[0004] Therefore, the utility model provides a battery pack disconnection unit to reduce the weight and volume of the battery pack disconnection unit and improve the safety of the battery pack disconnection unit.

[0005] The battery pack disconnection unit of the utility model includes a heating element and a thermoelectric cooler. The thermoelectric cooler has a cold end and a hot end, and the surface of the cold end facing away from the hot end is attached to and connected to the surface of the heating element.

[0006] Optionally, the battery pack disconnection unit includes a heating area, which is the position area affected by the heat generated by the heating element; the battery pack disconnection unit further includes a temperature sensor, and the temperature sensor is arranged in the heating area to collect the temperature of the heating area.

[0007] Optionally, both the temperature sensor and the thermoelectric cooler are electrically connected to the low-voltage interface of the battery pack disconnection unit.

[0008] Optionally, the surface of the cold end facing away from the hot end is bonded to the surface of the heating element through a thermal conductive adhesive.

[0009] Optionally, the thermoelectric cooler is a single-chip thermoelectric cooler; or, the thermoelectric cooler is a multi-chip thermoelectric cooler, and the multi-chip thermoelectric coolers are connected in series or in parallel.

[0010] Optionally, the heating element includes at least one of a relay, a fuse, a pre-charge resistor, and a Hall sensor.

[0011] Optionally, the heating element includes a heating element body and a conductive busbar. The conductive busbar includes a body connection portion that is electrically connected to the heating element body. The surface of the cold end facing away from the hot end is attached to and connected to the surface of the body connection portion.

[0012] Optionally, the battery pack disconnection unit further includes a heat dissipation device. The heat dissipation device includes heat dissipation fins that are attached to and connected to the surface of the hot end facing away from the cold end. The battery pack disconnection unit includes a housing that includes a top cover. The top cover is provided with a heat dissipation grille. The orthographic projection of the heat dissipation device in the direction away from the top cover covers at least a part of the heat dissipation grille.

[0013] The present utility model also provides a battery pack.

[0014] The battery pack of the present utility model includes the battery pack disconnection unit described in any one of the above.

[0015] Optionally, the battery pack further includes a battery management system. The semiconductor cooler is electrically connected to the battery management system.

[0016] The present utility model also provides a vehicle.

[0017] The vehicle of the present utility model includes the battery pack described in any one of the above.

[0018] For the battery pack disconnection unit of the present utility model, by attaching and connecting the surface of the cold end of the semiconductor cooler facing away from the hot end to the surface of the heating element, the cold end can absorb the heat of the heating element and transfer it to the hot end of the semiconductor cooler, realizing the cooling and heat dissipation of the heating element. Since the semiconductor cooler has the characteristics of light weight, small volume, and does not require the use of liquid cooling media, the battery pack disconnection unit has a small weight, a small volume, and good safety. Description of the Drawings

[0019] Figure 1 is an exploded structural schematic diagram of a battery pack disconnection unit according to an embodiment of the present utility model.

[0020] Figure 2 is Figure 1 an enlarged view of part A in

[0021] Figure 3 is a heat dissipation principle diagram of a battery pack disconnection unit according to an embodiment of the present utility model.

[0022] Figure 4It is the cooling principle diagram of the thermoelectric cooler in the battery pack circuit breaker unit of an embodiment of the present utility model.

[0023] Reference numerals:

[0024] 100, battery pack circuit breaker unit;

[0025] 1, heating element; 11, conductive bar; 111, relay connection part; 112, fuse connection part; 12, relay; 13, fuse;

[0026] 2, thermoelectric cooler; 21, cold end; 22, hot end; 201, P-type semiconductor; 202, N-type semiconductor; 203, metal conductor; 204, cold-end ceramic sheet; 205, hot-end ceramic sheet;

[0027] 3, heat dissipation device; 31, substrate; 32, heat dissipation fins;

[0028] 4, temperature sensor;

[0029] 5, low-voltage interface;

[0030] 6, housing; 61, top cover; 611, heat dissipation grille; 62, base;

[0031] 7, thermal conductive adhesive;

[0032] 200, battery management system. Detailed implementation manners

[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0034] As Figures 1 to 3 shown, the battery pack circuit breaker unit 100 of the embodiment of the present utility model includes a heating element 1 and a TEC (Thermo Electric Cooler, thermoelectric cooler 2). The thermoelectric cooler 2 has a cold end 21 and a hot end 22. The surface of the cold end 21 facing away from the hot end 22 is attached to and connected to the surface of the heating element 1.

[0035] For the battery pack circuit breaker unit 100 of the embodiment of the present utility model, by attaching and connecting the surface of the cold end 21 of the thermoelectric cooler 2 facing away from the hot end 22 to the surface of the heating element 1, the cold end 21 can absorb the heat of the heating element 1 and transfer it to the hot end 22 of the thermoelectric cooler 2, realizing the cooling and heat dissipation of the heating element 1. Due to the characteristics of light weight, small volume and no need to use liquid cooling medium of the thermoelectric cooler 2, the battery pack circuit breaker unit 100 has small weight, small volume and good safety.

[0036] As Figure 4 shown, the semiconductor cooler 2 includes a P-type semiconductor 201, an N-type semiconductor 202, a metal conductor 203, a cold-end ceramic sheet 204, and a hot-end ceramic sheet 205. The P-type semiconductor 201 and the N-type semiconductor 202 are connected in series through the metal conductor 203, and the metal conductor 203 is electrically connected to a power supply, which is used to provide direct current. The cold-end ceramic sheet 204 is connected to the heat-absorbing ends of the P-type semiconductor 201 and the N-type semiconductor 202, and the hot-end ceramic sheet 205 is connected to the heat-releasing ends of the P-type semiconductor 201 and the N-type semiconductor 202. The cold-end ceramic sheet 204 forms the cold end 21 of the semiconductor cooler 2, and the hot-end ceramic sheet 205 forms the hot end 22 of the semiconductor cooler 2. Among them, the power supply can be provided by the battery management system 200 of the battery pack, the vehicle low-voltage battery, or a DC-DC converter (DC-DC converter).

[0037] In addition, the semiconductor cooler 2 can work continuously and has the advantages of no pollution, no moving parts, no noise, long life, easy installation, and easy maintenance. The thermal inertia of the semiconductor cooler 2 is very small, and the cooling time is very fast, and a large temperature difference can be achieved in a very short time. The cooling method of the semiconductor cooler 2 and the heating element 1 is active cooling, which can greatly reduce the surface temperature of the heating element 1 and greatly improve the electrical performance of the heating element 1.

[0038] Optionally, as Figure 3 shown, the surface of the cold end 21 facing away from the hot end 22 is bonded to the surface of the heating element 1 through a thermal conductive adhesive 7.

[0039] For example, the cold end 21 and the heating element 1 are connected through a thermal conductive silicone gel.

[0040] Connecting the cold end 21 and the heating element 1 through the thermal conductive adhesive 7 can increase the connection area between the cold end 21 and the heating element 1, thereby increasing the heat exchange area between the cold end 21 and the heating element 1, improving the heat dissipation efficiency of the heating element 1, and improving the heat dissipation performance of the battery pack disconnection unit 100.

[0041] In some other embodiments, the cold end 21 and the heating element 1 can also be connected through a structural adhesive or a fastener, where the fastener can be a bolt, a screw, a rivet, etc.

[0042] Optionally, the heating element 1 includes at least one of a relay 12, a fuse 13, a pre-charge resistor, and a Hall sensor.

[0043] Among them, when the number of heating elements 1 is multiple, the number of semiconductor coolers 2 is also multiple, and the surface of each heating element 1 is attached to the cold end 21 of at least one semiconductor cooler 2, so as to realize the cooling and heat dissipation of multiple heating elements 1.

[0044] The heat generation of the relay 12, fuse 13, pre-charge resistor, and Hall sensor is relatively large, and the temperature is relatively high, making it easier to overheat or even experience thermal runaway problems. By cooling and dissipating heat from at least one of the relay 12, fuse 13, pre-charge resistor, and Hall sensor, the safety of the battery pack disconnection unit 100 can be effectively improved.

[0045] In some embodiments, as Figure 1 shown, the battery pack disconnection unit 100 further includes a heat dissipation device 3, and the hot end 22 is connected to the heat dissipation device 3.

[0046] By connecting the hot end 22 to the heat dissipation device 3, the heat of the hot end 22 can be released in time through the heat dissipation device 3, further improving the heat dissipation performance of the battery pack disconnection unit 100.

[0047] In some other embodiments, the heat dissipation device 3 may not be provided, and natural heat dissipation may be used to dissipate the heat of the hot end 22.

[0048] Optionally, as Figure 2 shown, the heat dissipation device 3 includes heat dissipation fins 32, and the heat dissipation fins 32 are attached to and connected to the surface of the hot end 22 facing away from the cold end 21.

[0049] For example, as Figure 2 shown, the heat dissipation device 3 includes a substrate 31 and a plurality of heat dissipation fins 32. The plurality of heat dissipation fins 32 are all connected to the substrate 31, and the substrate 31 is attached to and connected to the surface of the hot end 22 facing away from the cold end 21.

[0050] By setting the heat dissipation device 3 to include a plurality of heat dissipation fins 32, the heat dissipation area of the heat dissipation device 3 can be increased, further improving the heat dissipation performance of the battery pack disconnection unit 100.

[0051] In some other embodiments, the heat dissipation device 3 may also include a heat dissipation fan to achieve air-cooled heat dissipation of the hot end 22.

[0052] Optionally, the surface of the hot end 22 facing away from the cold end 21 is connected to the heat dissipation device 3 through a thermal conductive adhesive 7.

[0053] For example, the surface of the hot end 22 facing away from the cold end 21 is connected to the heat dissipation device 3 through thermal conductive silicone.

[0054] Connecting the hot end 22 to the heat dissipation device 3 through the thermal conductive adhesive 7 can increase the connection area between the hot end 22 and the heat dissipation device 3, thereby increasing the heat exchange area between the hot end 22 and the heat dissipation device 3, improving the heat dissipation efficiency of the hot end 22, and improving the heat dissipation performance of the battery pack disconnection unit 100.

[0055] In some other embodiments, the hot end 22 and the heat dissipation device 3 can also be connected by structural adhesive or fasteners. Among them, the fasteners can be bolts, screws, rivets, etc.

[0056] Optionally, as Figure 1 and Figure 3 shown, the battery pack disconnection unit 100 includes a housing 6. The housing 6 includes a top cover 61, and the top cover 61 is provided with a heat dissipation grille 611. The orthographic projection of the heat dissipation device 3 in the direction towards the top cover 61 covers at least a part of the heat dissipation grille 611. Among them, the orthographic projection of the heat dissipation device 3 in the direction towards the top cover 61 covering at least a part of the heat dissipation grille 611 can be understood as: the orthographic projection of the heat dissipation device 3 in the direction towards the top cover 61 only covers a part of the heat dissipation grille 611; or, the orthographic projection of the heat dissipation device 3 in the direction towards the top cover 61 only covers the whole of the heat dissipation grille 611.

[0057] For example, as Figure 1 shown, the housing 6 includes a top cover 61 and a base 62. The top cover 61 is arranged on the upper side of the base 62. The top cover 61 is connected to the base 62 and encloses a receiving cavity. The heating element 1, the semiconductor cooler 2 and the heat dissipation device 3 are all arranged in the receiving cavity. Among them, the up-down direction is as Figure 1 shown. The orthographic projection of the heat dissipation device 3 upwards covers at least a part of the heat dissipation grille 611.

[0058] By providing the heat dissipation grille 611 on the top cover 61 of the housing 6, and the orthographic projection of the heat dissipation device 3 in the direction towards the top cover 61 covering at least a part of the heat dissipation grille 611, the heat of the heat dissipation device 3 can be released to the outside of the housing 6 through the heat dissipation grille 611, further improving the heat dissipation performance of the battery pack disconnection unit 100.

[0059] In some other embodiments, the housing 6 may not be provided with the heat dissipation grille 611. At this time, the heat dissipation device 3 can be connected to the housing 6, so that the heat of the heat dissipation device 3 is transferred to the housing 6 through heat conduction, and then the housing 6 is released to the outside through natural heat dissipation.

[0060] In some embodiments, the heating element 1 includes a heating element body and a conductive busbar 11. The conductive busbar 11 includes a body connection part, and the body connection part is electrically connected to the heating element body. The surface of the cold end 21 facing away from the hot end 22 is attached to and connected to the surface of the body connection part.

[0061] For example, as Figure 1 and Figure 3 shown, the heating element body is a relay 12, the body connection part is a relay connection part 111, the relay connection part 111 is electrically connected to the contact of the relay 12, and the cold end 21 is connected to the relay connection part 111.

[0062] Again, for example, asFigure 1 and Figure 2 As shown, the heating element body is the fuse 13, the body connection part is the fuse connection part 112, the fuse connection part 112 is electrically connected to the contact of the fuse 13, and the cold end 21 is connected to the fuse connection part 112.

[0063] The heating element body generates a large amount of heat and has a high temperature, making it more likely to overheat or even experience thermal runaway. By connecting the cold end 21 to the body connection part of the conductive bar 11, the heat generated by the heating element body can be timely transferred to the cold end 21 through the body connection part of the conductive bar 11, realizing the cooling and heat dissipation of the heating element body and further improving the safety of the battery pack disconnection unit 100. In addition, the surface area of the conductive bar 11 is large. By connecting the cold end 21 to the conductive bar 11, it is convenient to connect the semiconductor cooler 2 to the conductive bar 11.

[0064] In some embodiments, the battery pack disconnection unit 100 includes a heating area, which is the position area affected by the heating of the heating element 1. As Figures 1 to 3 shown, the battery pack disconnection unit 100 further includes a temperature sensor 4, and the temperature sensor 4 is arranged in the heating area to collect the temperature of the heating area. Among them, the heating area can be the area where the heating element 1 is located, the surrounding area of the heating element 1, or the housing 6 in contact with the heating element 1. For example, the temperature sensor 4 can be arranged at the conductive bar 11, the contact of the relay 12, the contact of the fuse 13, the position of the housing 6 close to the conductive bar 11, etc.

[0065] Among them, the temperature sensor 4 can be an NTC temperature sensor.

[0066] By arranging the temperature sensor 4 in the heating area to collect the temperature of the heating area, the working state (such as power size, start and stop, etc.) of the semiconductor cooler 2 can be controlled according to the collected temperature, improving the temperature control accuracy of the heating area and the overall performance of the battery pack disconnection unit 100.

[0067] In some other embodiments, the battery pack disconnection unit 100 may not include the temperature sensor 4 either.

[0068] Optionally, as Figures 1 to 3 shown, the heating element 1 includes a relay 12, and the temperature sensor 4 is arranged at the contact of the relay 12.

[0069] For example, as Figure 3 shown, the temperature sensor 4 is arranged between the semiconductor cooler 2 and the contact of the relay 12 and is connected to the relay connection part 111.

[0070] As described above, overheating and even thermal runaway are likely to occur at the contacts of the relay 12. By arranging the temperature sensor 4 at the contacts of the relay 12 to collect the temperature at the contacts of the relay 12, the operating state of the semiconductor cooler 2 can be controlled according to the temperature at the contacts of the relay 12, thereby improving the temperature control accuracy at the contacts of the relay 12 and enhancing the safety of the battery pack disconnection unit 100.

[0071] Of course, the temperature sensor 4 can also be arranged at other positions of the relay 12 except for the contacts.

[0072] Optionally, as Figure 1 shown, the heating element 1 includes a fuse 13, and the temperature sensor 4 is arranged at the contacts of the fuse 13.

[0073] For example, the temperature sensor 4 is arranged between the contacts of the semiconductor cooler 2 and the fuse 13 and is connected to the fuse connection part 112.

[0074] As described above, overheating and even thermal runaway are likely to occur at the contacts of the fuse 13. By arranging the temperature sensor 4 at the contacts of the fuse 13 to collect the temperature at the contacts of the fuse 13, the operating state of the semiconductor cooler 2 can be controlled according to the temperature at the contacts of the fuse 13, thereby improving the temperature control accuracy at the contacts of the fuse 13 and enhancing the safety of the battery pack disconnection unit 100.

[0075] Of course, the temperature sensor 4 can also be arranged at other positions of the fuse 13 except for the contacts.

[0076] Optionally, as Figure 1 shown, both the temperature sensor 4 and the semiconductor cooler 2 are electrically connected to the low-voltage interface 5 of the battery pack disconnection unit 100.

[0077] By electrically connecting the temperature sensor 4 and the semiconductor cooler 2 to the low-voltage interface 5 of the battery pack disconnection unit 100, when installing the battery pack disconnection unit 100, the low-voltage interface 5 can be directly electrically connected to other components (such as a battery management system) through a wiring harness, thereby realizing the signal and electrical connection between the temperature sensor 4 and the semiconductor cooler 2 and other components, which facilitates the installation of the battery pack disconnection unit 100.

[0078] Of course, in some other embodiments, the temperature sensor 4 and the semiconductor cooler 2 may not be electrically connected to the low-voltage interface 5, and a first wire harness electrically connected to the temperature sensor 4 and a second wire harness electrically connected to the semiconductor cooler 2 are provided. Both the first wire harness and the second wire harness extend to the outside of the housing 6. At this time, when installing the battery pack disconnection unit 100, the first wire harness and the second wire harness are directly electrically connected to other components to achieve signal and electrical connection between the temperature sensor 4 and the semiconductor cooler 2 and other components.

[0079] Optionally, the semiconductor cooler 2 is a single-chip semiconductor cooler.

[0080] Wherein, when there are multiple heat-generating regions in the battery pack disconnection unit 100, the number of single-chip semiconductor coolers is set to be multiple, and each heat-generating region is connected to at least one single-chip semiconductor cooler to achieve cooling and heat dissipation for each heat-generating region.

[0081] The semiconductor cooler 2 being set as a single-chip semiconductor cooler is beneficial to further reduce the weight and volume of the battery pack disconnection unit 100.

[0082] In some other embodiments, the semiconductor cooler 2 is a multi-chip semiconductor cooler, and the multi-chip semiconductor coolers are connected in series or in parallel. The maximum refrigeration power of the multi-chip semiconductor cooler is greater than the maximum refrigeration power of the single-chip semiconductor cooler.

[0083] Wherein, when there are multiple heat-generating regions in the battery pack disconnection unit 100, the number of multi-chip semiconductor coolers can be set to one, and at least one semiconductor cooler is provided in each heat-generating region; or, the number of multi-chip semiconductor coolers is set to be multiple, and at least one multi-chip semiconductor cooler is provided in each heat-generating region. Thus, cooling and heat dissipation for each heat-generating region are achieved.

[0084] By setting the semiconductor cooler 2 as a multi-chip semiconductor cooler, it is convenient to select the refrigeration power of the semiconductor cooler 2 according to the heat dissipation requirements of the battery pack disconnection unit 100.

[0085] During specific design, the layout position of the semiconductor cooler 2 and the number of semiconductor cooler 2 chips can be selected according to the position and heat dissipation requirements of the heating element 1.

[0086] The battery pack of the embodiment of the present utility model includes the battery pack disconnection unit 100 described in any of the above embodiments.

[0087] Since the battery pack disconnection unit 100 is small in weight, small in volume and good in safety, therefore, the battery pack of the embodiment of the present utility model has the advantages of small weight, small volume and good safety.

[0088] Optionally, as Figure 3As shown, the battery pack further includes a BMS (Battery Management System 200), and the semiconductor cooler 2 is electrically connected to the battery management system 200.

[0089] For example, the semiconductor cooler 2 is electrically connected to the battery management system 200 through a low-voltage interface 5.

[0090] By electrically connecting the semiconductor cooler 2 to the battery management system 200, the battery management system 200 can supply power to the semiconductor cooler 2 and control the working state of the semiconductor cooler 2, which facilitates the installation and control of the semiconductor cooler 2.

[0091] In some other embodiments, other controllers can also be used to control the working state of the semiconductor cooler 2. For example, a vehicle controller is used to control the working state of the semiconductor cooler 2.

[0092] Optionally, the temperature sensor 4 is electrically connected to the battery management system 200.

[0093] For example, the temperature sensor 4 is electrically connected to the battery management system 200 through a low-voltage interface 5.

[0094] Thus, the temperature signal collected by the temperature sensor 4 and the control signal of the semiconductor cooler 2 are output to the battery management system 200 for interactive management. According to the temperature data transmitted in real time by the temperature sensor 4, the working state of the semiconductor cooler 2 is adjusted in real time through the battery management system 200, so as to achieve the temperature control accuracy of the battery pack disconnection unit 100 and improve the overall performance of the battery pack disconnection unit 100.

[0095] The vehicle according to an embodiment of the present invention includes the battery pack described in any of the above embodiments.

[0096] Since the battery pack has the advantages of small weight, small volume and good safety, the vehicle according to the embodiment of the present invention has the advantages of long cruising range and good safety.

[0097] For the battery pack disconnection unit 100 according to the embodiment of the present invention, the semiconductor cooler 2 is used to realize the cooling and heat dissipation of the battery pack disconnection unit 100, and the battery management system 200 is used to control the semiconductor cooler 2, so as to achieve low-cost, low-latency, high-precision and high-efficiency temperature control of the battery pack disconnection unit 100. Since the semiconductor cooler 2 has no moving parts, the NVH performance of the whole vehicle can also be improved.

[0098] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A battery pack disconnect unit, characterized in that: include: Heating element; A semiconductor refrigerator, wherein the semiconductor refrigerator has a cold end and a hot end, and the surface of the cold end facing away from the hot end is attached to and connected to the surface of the heating element; The heating element comprises a heating element body and a conductive row, wherein the conductive row comprises a body connecting portion, the body connecting portion is electrically connected to the heating element body, and the surface of the cold end facing away from the hot end is attached to and connected to the surface of the body connecting portion.

2. The battery pack disconnect unit according to claim 1, characterized in that: The battery pack disconnecting unit includes a heating area, and the heating area is a position area affected by the heating of the heating element; The battery pack disconnecting unit further includes a temperature sensor, which is disposed in the heating area to collect the temperature of the heating area.

3. The battery pack disconnect unit according to claim 2, characterized in that: The temperature sensor and the semiconductor refrigerator are both electrically connected to the low-voltage interface of the battery pack disconnect unit.

4. The battery pack disconnect unit according to claim 1, characterized in that: The surface of the cold end facing away from the hot end is bonded to the surface of the heating element by means of heat-conducting adhesive.

5. The battery pack disconnect unit according to claim 1, characterized in that: The semiconductor refrigerator is a single-chip semiconductor refrigerator; or The semiconductor refrigerator is a plurality of semiconductor refrigerators, and the plurality of semiconductor refrigerators are connected in series or in parallel.

6. The battery pack disconnect unit according to claim 1, characterized in that: The heating element includes at least one of a relay, a fuse, a pre-charging resistor and a Hall sensor.

7. The battery pack disconnect unit according to claim 1, characterized in that: The battery pack disconnecting unit further includes a heat dissipation device, the heat dissipation device includes heat dissipation fins, and the heat dissipation fins are attached to and connected to the surface of the hot end facing away from the cold end; The battery pack disconnecting unit comprises a shell, the shell comprises a top cover, the top cover is provided with a heat dissipation grille, and the positive projection of the heat dissipation device in a direction away from the top cover covers at least a part of the heat dissipation grille.

8. A battery pack, characterized in that: A battery pack disconnecting unit comprising the battery pack disconnecting unit described in any one of claims 1 to 7.

9. The battery pack according to claim 8, characterized in that: The battery pack further comprises a battery management system, and the semiconductor refrigerator is electrically connected to the battery management system.

10. A vehicle, characterized in that: Comprising the battery pack as described in claim 8 or 9.

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