BDU unit, battery pack and vehicle

Abstract

The utility model relates to a BDU unit, a battery pack and a vehicle, the BDU unit comprises a BDU body, a heat conduction part and a cold plate, the heat conduction part abuts between the BDU body and the cold plate, and at least part of the heat conduction part is made of a graphene material. According to the technical scheme, the heat dissipation efficiency of the BDU unit provided by the utility model is relatively high, so that the use safety of the BDU unit is ensured.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of BDU heat dissipation, in particular, to a BDU unit, a battery pack and a vehicle. BACKGROUND

[0002] As a device for disconnecting and connecting high-voltage electricity of new energy vehicle power battery, the battery disconnect unit (BDU) is a working unit for high-voltage distribution, cutting off and short-circuit protection of the battery system, usually including overcurrent protection design, overheat protection design, high-voltage current connection and cutting off, etc. functions, which plays a vital role in the safety of the battery pack, and therefore is a relatively key safety component on new energy vehicles.

[0003] In the related art, with the rapid development of new energy vehicles, the requirements for power battery fast charging and discharging capacity are becoming higher and higher, and the charging and discharging current is becoming larger and larger. In this case, in order to ensure the thermal safety of the battery, it is necessary to effectively dissipate heat from the battery disconnect unit. Therefore, how to improve the heat dissipation efficiency of the battery disconnect unit to cope with the temperature rise of the battery disconnect unit is a problem to be solved at present. UTILITY MODEL CONTENT

[0004] The purpose of the present disclosure is to provide a BDU unit, a battery pack and a vehicle, which has high heat dissipation efficiency to ensure its own use safety.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a BDU unit, comprising a BDU body, a heat-conducting piece and a cold plate, the heat-conducting piece is abutted between the BDU body and the cold plate, wherein at least part of the heat-conducting piece is made of graphene material.

[0006] Optionally, the heat-conducting piece comprises a heat-conducting film and a heat-conducting pad, the heat-conducting film is made of graphene material, and the heat-conducting film is attached to the heat-conducting pad.

[0007] Optionally, the heat-conducting film has a first sub-film and a second sub-film connected to each other, one of the first sub-film and the second sub-film is attached to the BDU body, and the other is attached to the cold plate.

[0008] Optionally, the first sub-film and the second sub-film are arranged on both sides of the thickness direction of the heat-conducting pad, the heat-conducting film further comprises a third sub-film, the third sub-film is attached to the heat-conducting pad and connects the first sub-film and the second sub-film.

[0009] Optionally, the BDU body comprises an electrical device and a connection row, the connection row is electrically connected with the electrical device through a fastener, and the BDU unit further comprises a heat-dissipating piece arranged on the connection row, at least part of the heat-dissipating piece is made of phase change material.

[0010] Optionally, the heat dissipation member is bonded to the connecting strip.

[0011] Optionally, the BDU body has oppositely arranged first and second side portions in a direction perpendicular to the height of the BDU body, and at least one of the first and second side portions is provided with the heat conduction member and the cold plate.

[0012] Optionally, the BDU body includes an electrical device and a connecting strip electrically connected to the electrical device by a fastener, wherein the first side portion is provided with a through hole for the fastener to pass through, and the fastener abuts against the heat conduction member.

[0013] Optionally, the BDU unit further includes an insulating pad arranged between the heat conduction member and the BDU body.

[0014] The present disclosure also provides a battery pack including the above-mentioned BDU unit.

[0015] The present disclosure further provides a vehicle including the above-mentioned BDU unit or the above-mentioned battery pack.

[0016] With the above technical solution, in the BDU unit provided by the present disclosure, the heat of the BDU body is transmitted to the cold plate through the heat conduction member abutting between the BDU body and the cold plate, and then the cold plate is used for cooling, thereby realizing heat dissipation of the BDU body and avoiding over-temperature of the BDU body to affect normal use. Since the BDU body is a core component of the BDU unit, the BDU unit can also be effectively cooled, thereby ensuring the use safety of the BDU unit. In addition, since graphene has very good heat conduction performance, and the thermal conductivity of pure defect-free single-layer graphene is at least 5300 W / (m·K), the heat conduction member made at least partially of graphene material can further improve the heat conduction performance of the heat conduction member, thereby being more conducive to heat dissipation of the BDU body. Therefore, the heat dissipation efficiency of the BDU unit of the present disclosure is high, so as to ensure the use safety of itself.

[0017] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0019] Figure 1 is an exploded structural schematic view of the BDU unit provided by the exemplary embodiments of the present disclosure.

[0020] Figure 2 is another exploded structural schematic view of the BDU unit provided by an exemplary embodiment of the present disclosure;

[0021] Figure 3 is a structural schematic view of the heat conduction member provided by an exemplary embodiment of the present disclosure;

[0022] Figure 4 is another exploded structural schematic view of the BDU unit provided by an exemplary embodiment of the present disclosure;

[0023] Figure 5 is a partial structural schematic view of the BDU unit provided by an exemplary embodiment of the present disclosure;

[0024] Figure 6 is another partial structural schematic view of the BDU unit provided by an exemplary embodiment of the present disclosure.

[0025] Legend of Reference Signs

[0026] 1-BDU body; 11-connection row; 12-electric device; 13-fastener; 14-first side; 141-via hole; 15-second side; 2-heat conduction member; 21-heat conduction film; 211-first sub-film; 212-second sub-film; 213-third sub-film; 22-heat conduction pad; 3-cold plate; 4-radiation member; 5-insulating pad. DETAILED DESCRIPTION

[0027] The detailed description of the present disclosure is described below in conjunction with the accompanying drawings. It should be understood that the detailed description described herein is only used to explain and illustrate the present disclosure, and is not used to limit the present disclosure.

[0028] In the present disclosure, the orientation words such as "upper" and "lower" refer to the upper and lower directions of the gravity direction in actual use, unless otherwise stated. In addition, "inner" and "outer" refer to "inner" and "outer" with respect to the outline of the corresponding component itself. Furthermore, the terms "first", "second", "third", and the like used in the present disclosure are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, in the following description, the same reference signs in different drawings represent the same or similar elements, unless otherwise explained. The above definitions are only used to explain and illustrate the present disclosure, and should not be understood as limiting the present disclosure.

[0029] The present disclosure provides a BDU unit, referring to Figure 2 shown in FIG. 1, the BDU unit includes a BDU body 1, a heat conduction member 2, and a cold plate 3, the heat conduction member 2 is abutted between the BDU body 1 and the cold plate 3, wherein at least part of the heat conduction member 2 is made of graphene material.

[0030] Through the technical scheme, in the BDU unit provided by the present disclosure, the heat of the BDU body 1 is transmitted to the cold plate 3 through the heat conduction piece 2, and then cooled by the cold plate 3, thereby achieving heat dissipation of the BDU body 1 and avoiding over-temperature of the BDU body 1 to affect normal use. Among them, since the BDU body 1 is the core component of the BDU unit, effective heat dissipation of the BDU unit can also be achieved to ensure the use safety of the BDU unit. In addition, since graphene has very good heat conduction performance, and the thermal conductivity of pure single-layer graphene without defects is at least 5300 W / (m·K), the heat conduction performance of the heat conduction piece 2 can be further improved by setting the heat conduction piece 2 to be at least partially made of graphene material, thereby more facilitating heat dissipation of the BDU body 1, so that the heat dissipation efficiency of the BDU unit of the present disclosure is high to ensure the use safety of itself.

[0031] It should be noted that the cold plate 3 of the BDU unit can be used to be attached with the liquid cooling plate of the battery pack, and the present disclosure does not limit this.

[0032] In the exemplary embodiments provided by the present disclosure, referring to Figure 3 , the heat conduction piece 2 can include a heat conduction film 21 and a heat conduction pad 22, the heat conduction film 21 is made of graphene material, and the heat conduction film 21 is attached to the heat conduction pad 22, for example, the heat conduction film 21 can be bonded to the heat conduction pad 22, so that the heat conduction pad 22 and graphene both have good heat conduction performance, and the heat conduction pad 22 has good compression performance, wherein the thermal conductivity of the heat conduction pad 22 can be 1.9-3.0 W / (m·K), and the thermal conductivity of pure single-layer graphene without defects is at least 5300 W / (m·K), so that through such setting, on the one hand, the heat conduction piece 2 can have good heat conduction performance to achieve good heat dissipation of the BDU body 1, and on the other hand, the size tolerance of the entire BDU unit can be absorbed by the compression characteristics of the heat conduction pad 22, thereby facilitating the arrangement of the heat conduction film 21 between the BDU body 1 and the cold plate 3.

[0033] In the exemplary embodiments provided by the present disclosure, referring to Figure 3 , in order to improve the heat conduction performance of the heat conduction piece 2, the heat conduction film 21 can be provided with a first sub-film 211 and a second sub-film 212 connected together, one of the first sub-film 211 and the second sub-film 212 is attached to the BDU body 1, and the other is attached to the cold plate 3, so that when heat conduction is performed, the heat conduction film 21 with a larger thermal conductivity in the heat conduction piece 2 can be in contact with the BDU body 1 and the cold plate 3 at the same time, so that the heat of the BDU body 1 is transmitted to the cold plate 3 as much as possible through the heat conduction film 21, and thus the heat dissipation effect of the BDU body 1 can be further improved.

[0034] Continuing to refer to Figure 3 As graphene has better thermal conductivity in the direction of its own extension than in the direction of its own thickness, to further improve the heat dissipation effect of the BDU body 1, the first sub-film 211 and the second sub-film 212 can be arranged on both sides of the thermal pad 22 in the thickness direction, and the thermal film 21 can further include a third sub-film 213, which is attached to the thermal pad 22 and connects the first sub-film 211 and the second sub-film 212. In this way, the thermal film 21 can be attached to the surface of the thermal pad 22 in a U-shaped manner, so that the heat on the BDU body 1 is sequentially conducted to the cold plate 3 through the first sub-film 211, the third sub-film 213 and the second sub-film 212 of the thermal film 21 in the direction of extension of the thermal film 21. In this way, the heat on the BDU body 1 can be quickly conducted to the cold plate 3 by taking advantage of the thermal conductivity of the thermal film 21 made of graphene in the direction of its own extension, so that the heat dissipation effect of the BDU body 1 can be further improved compared to directly conducting heat in the thickness direction of the thermal film 21.

[0035] In the example embodiments provided in the present disclosure, reference is made to Figures 4 to 6 As shown in The BDU body 1 can include an electrical device 12 and a connection bar 11, where the electrical device 12 can be a relay, a fuse or a shunt, and the connection bar 11 can be a copper bar. The connection bar 11 is electrically connected to the electrical device 12 by a fastener 13 (e.g., a bolt). The BDU unit can further include a heat dissipation member 4 arranged on the connection bar 11, at least part of which is made of a phase change material. In this way, the connection bar 11 can be cooled by the phase change of the phase change material. The phase change material can be a solid-liquid phase change material, a solid-solid phase change material or a gas-liquid phase change material, which is not limited in the present disclosure and can be selected flexibly according to actual conditions. In addition, since the use temperature of the BDU body 1 is usually -40°C to 65°C, a phase change material matching the above temperature range can be selected.

[0036] The heat dissipation member 4 can be arranged on the connection bar 11 in any suitable manner, which is not limited in the present disclosure. For example, when the phase change material is a solid-liquid phase change material or a solid-solid phase change material, the heat dissipation member 4 can be bonded to the connection bar 11. According to some embodiments, the heat dissipation member 4 can be bonded to the connection bar 11 by heat-resistant glue to improve the reliability of the heat dissipation member 4 after bonding to the connection bar 11.

[0037] In the example embodiments provided in the present disclosure, reference is made to Figure 4 and Figure 5As shown in FIGS. 1-3, the BDU body 1 can be provided with a first side portion 14 and a second side portion 15 arranged oppositely in a direction perpendicular to the height of the BDU body 1, and at least one of the first side portion 14 and the second side portion 15 is provided with the heat conduction member 2 and the cold plate 3. In this way, since the heat conduction member 2 and the cold plate 3 are arranged in the direction perpendicular to the height of the BDU body 1, the overall height of the BDU unit in the direction of the height of the BDU body 1 can be reduced. Therefore, when the BDU unit is applied to the battery pack in the vehicle, even if the BDU unit is usually arranged below the rear seat, since the direction of the height of the BDU body 1 corresponds to the height direction of the vehicle in use when installed, and the height of the BDU unit is compressed by the foregoing design, the size of the BDU unit in the height direction of the vehicle can be reduced, so that the rear seat can be arranged at a relatively low position, thereby reserving more spacious seating space for passengers in the height direction of the vehicle, and improving the comfort of passengers when sitting.

[0038] In the example embodiment provided by the present disclosure, as shown in FIGS. 1-3, the BDU body 1 can include electrical devices 12 and a connection row 11, wherein the electrical devices 12 can be relays, fuses or shunts, and the connection row 11 can be a copper row, and the connection row 11 is electrically connected to the electrical devices 12 by fasteners 13 (such as bolts), wherein the first side portion 14 is provided with through holes 141 for the fasteners 13 to pass through, and the fasteners 13 abut against the heat conduction member 2. In this way, since the temperature at the connection between the electrical devices 12 and the connection row 11 is relatively high, the fasteners 13 abutting against the heat conduction member 2 can more quickly conduct the heat away, thereby more facilitating the rapid heat dissipation of the BDU body 1. In addition, compared with the traditional heat conduction mode in which the heat is conducted from the electrical devices 12 to the connection row 11 and then to the cold plate 3, the present disclosure adopts the foregoing arrangement to directly conduct the heat on the electrical devices 12 to the cold plate 3 through the fasteners 13, thereby shortening the heat conduction path and further improving the heat dissipation effect.

[0039] In the example embodiment provided by the present disclosure, as shown in FIGS. 1-3, the BDU body 1 can include electrical devices 12 and a connection row 11, wherein the electrical devices 12 can be relays, fuses or shunts, and the connection row 11 can be a copper row, and the connection row 11 is electrically connected to the electrical devices 12 by fasteners 13 (such as bolts), wherein the first side portion 14 is provided with through holes 141 for the fasteners 13 to pass through, and the fasteners 13 abut against the heat conduction member 2. In this way, since the temperature at the connection between the electrical devices 12 and the connection row 11 is relatively high, the fasteners 13 abutting against the heat conduction member 2 can more quickly conduct the heat away, thereby more facilitating the rapid heat dissipation of the BDU body 1. In addition, compared with the traditional heat conduction mode in which the heat is conducted from the electrical devices 12 to the connection row 11 and then to the cold plate 3, the present disclosure adopts the foregoing arrangement to directly conduct the heat on the electrical devices 12 to the cold plate 3 through the fasteners 13, thereby shortening the heat conduction path and further improving the heat dissipation effect. Figure 1 Figure 2 In the example embodiment provided by the present disclosure, as shown in FIGS. 1-3, the BDU body 1 can include electrical devices 12 and a connection row 11, wherein the electrical devices 12 can be relays, fuses or shunts, and the connection row 11 can be a copper row, and the connection row 11 is electrically connected to the electrical devices 12 by fasteners 13 (such as bolts), wherein the first side portion 14 is provided with through holes 141 for the fasteners 13 to pass through, and the fasteners 13 abut against the heat conduction member 2. In this way, since the temperature at the connection between the electrical devices 12 and the connection row 11 is relatively high, the fasteners 13 abutting against the heat conduction member 2 can more quickly conduct the heat away, thereby more facilitating the rapid heat dissipation of the BDU body 1. In addition, compared with the traditional heat conduction mode in which the heat is conducted from the electrical devices 12 to the connection row 11 and then to the cold plate 3, the present disclosure adopts the foregoing arrangement to directly conduct the heat on the electrical devices 12 to the cold plate 3 through the fasteners 13, thereby shortening the heat conduction path and further improving the heat dissipation effect. Figure 4 In the example embodiment provided by the present disclosure, as shown in FIGS. 1-3, the BDU body 1 can include electrical devices 12 and a connection row 11, wherein the electrical devices 12 can be relays, fuses or shunts, and the connection row 11 can be a copper row, and the connection row 11 is electrically connected to the electrical devices 12 by fasteners 13 (such as bolts), wherein the first side portion 14 is provided with through holes 141 for the fasteners 13 to pass through, and the fasteners 13 abut against the heat conduction member 2. In this way, since the temperature at the connection between the electrical devices 12 and the connection row 11 is relatively high, the fasteners 13 abutting against the heat conduction member 2 can more quickly conduct the heat away, thereby more facilitating the rapid heat dissipation of the BDU body 1. In addition, compared with the traditional heat conduction mode in which the heat is conducted from the electrical devices 12 to the connection row 11 and then to the cold plate 3, the present disclosure adopts the foregoing arrangement to directly conduct the heat on the electrical devices 12 to the cold plate 3 through the fasteners 13, thereby shortening the heat conduction path and further improving the heat dissipation effect.

[0040] The present disclosure also provides a battery pack comprising the BDU unit described above.

[0041] ​The present disclosure also provides a vehicle comprising the BDU unit or the battery pack described above. The vehicle can be a pure electric vehicle or a hybrid vehicle.

[0042] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0043] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0044] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A BDU unit, characterized by, The BDU unit comprises a BDU body, a heat conduction member and a cold plate, the heat conduction member is abutted between the BDU body and the cold plate, wherein at least part of the heat conduction member is made of graphene material.

2. The BDU unit of claim 1, wherein, The heat conduction member comprises a heat conduction film and a heat conduction pad, the heat conduction film is made of graphene material, and the heat conduction film is attached to the heat conduction pad.

3. The BDU unit of claim 2, wherein, The heat conduction film has a first sub-film and a second sub-film connected to each other, one of the first sub-film and the second sub-film is attached to the BDU body, and the other is attached to the cold plate.

4. The BDU unit of claim 3, wherein, The first sub-film and the second sub-film are arranged on both sides of the heat conduction pad in the thickness direction, the heat conduction film further comprises a third sub-film, the third sub-film is attached to the heat conduction pad and connects the first sub-film and the second sub-film.

5. The BDU unit of any of claims 1-4, wherein, The BDU body comprises an electrical device and a connecting row, the connecting row is electrically connected to the electrical device by a fastener, and the BDU unit further comprises a heat dissipation member arranged on the connecting row, at least part of the heat dissipation member is made of phase change material.

6. The BDU unit of claim 5, wherein, The heat dissipation member is bonded to the connecting row.

7. The BDU unit of claim 1, wherein, The BDU body has a first side and a second side arranged oppositely in a direction perpendicular to the height of the BDU body, at least one of the first side and the second side is provided with the heat conduction member and the cold plate.

8. The BDU unit of claim 7, wherein, The BDU body comprises an electrical device and a connecting row, the connecting row is electrically connected to the electrical device by a fastener, wherein the first side is provided with a via hole for the fastener to pass through, and the fastener is abutted with the heat conduction member.

9. The BDU unit of claim 1, wherein, The BDU unit further comprises an insulating pad arranged between the heat conduction member and the BDU body.

10. A battery pack, characterized by, The BDU unit comprises the BDU unit of any one of claims 1-9.

11. A vehicle characterized by comprising: The BDU unit comprises the BDU unit of any one of claims 1-9 or the battery pack of claim 10.

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