A battery BDU cooling system and electrical equipment

Abstract

This embodiment of the present application provides a battery BDU cooling system, comprising: a battery module; a BDU water-cooling assembly disposed within and above the battery module; a BDU assembly supported above the BDU water-cooling assembly; and a thermal protection assembly disposed between the battery module and the BDU water-cooling assembly. This embodiment of the battery BDU cooling system fully utilizes the z-direction space within the battery pack, meeting both the battery pack's space requirements and actively cooling the BDU assembly through water, thus meeting the BDU's cooling requirements. Furthermore, the thermal protection assembly effectively suppresses the spread of thermal runaway, further satisfying the battery pack's safety requirements.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery BDU heat dissipation system and electrical equipment. Background Art

[0002] At present, in new energy vehicles, the requirements for fast charging of power batteries are getting higher and higher, and the charging current is getting larger and larger, which requires effective heat dissipation of the batteries.

[0003] The Battery Disconnect Unit (BDU) is a device that disconnects and connects high voltage power to the power battery of new energy vehicles. It is a working unit for high voltage distribution, disconnection, and short-circuit protection of the battery system. It plays a vital role in the safety of the battery pack and is therefore a relatively key component in new energy vehicles.

[0004] However, due to the limitations of the overall layout of the battery pack, its internal space is limited. How to reasonably layout the BDU to reduce space occupancy and effectively dissipate heat from the BDU is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a battery BDU heat dissipation system and electrical equipment to solve the problem in the related art that the BDU and its heat dissipation system occupy a large space and cannot achieve effective heat dissipation.

[0006] An embodiment of the present application provides a battery BDU heat dissipation system, comprising: a battery module; a BDU water-cooling assembly, arranged on and above the battery module; a BDU assembly, supported above the BDU water-cooling assembly; and a thermal protection assembly, arranged between the battery module and the BDU water-cooling assembly.

[0007] In the embodiment of the present application, the battery BDU cooling system has a thermal protection component, a BDU water cooling component and a BDU component stacked in sequence on top of the battery module, which fully utilizes the z-direction space of the battery pack, reduces the connection length of the copper busbar, and saves space in the x-direction and y-direction of the battery pack. It not only meets the space requirements of the battery pack, but also can actively cool the BDU components by water cooling to meet the heat dissipation needs of the BDU components. It further effectively suppresses the spread of thermal runaway through the thermal protection component, and also meets the safety requirements of the battery pack, ultimately forming a reliable and stable battery BDU cooling system.

[0008] In some embodiments, the BDU water cooling assembly includes a bracket and a cold water plate. A cold water trough is provided on the upper surface of the bracket. The cold water plate is provided on the bracket and covers the cold water trough to form a cold water flow channel for cold water circulation; the BDU assembly is supported on the cold water plate.

[0009] In the embodiment of the present application, water cooling is used to actively exchange heat and cool the BDU components. Compared with natural passive heat dissipation, the heat dissipation efficiency is greatly improved, thereby meeting the functional requirements of the BDU components.

[0010] In some embodiments, an elastic support member is provided between the cold water plate and the bracket, and the BDU assembly is located at a position on the cold water plate corresponding to the elastic support member.

[0011] In this embodiment of the present application, the elastic support members provide elastic support for the BDU assembly on the cold water plate. Furthermore, the elastic support members allow the BDU assembly to more effectively exchange heat with the cold water in the water-cooling channel. For example, the elastic support members can be made of foamed silicone rubber. Preferably, the foamed silicone rubber has a compressive stress of 30 kPa to meet the requirements for the BDU assembly's thermal conductivity surface and the force required to support the bracket 30.

[0012] In some embodiments, the BDU assembly includes a BDU body and a heat-conducting component, wherein the heat-conducting component is disposed between the BDU body and the cold water plate and contacts the BDU body and the cold water plate.

[0013] In the embodiment of the present application, the heat-conducting component absorbs the heat generated by the BDU body and transfers it to the elastic support component through the cold water plate. The elastic support component exchanges heat with the cold water in the water-cooling channel. The heat-conducting efficiency is improved by cooperating with the heat-conducting component 53 and the elastic support component, and the heat dissipation effect is obvious.

[0014] In some embodiments, the bracket is provided with multiple fixing columns, the cold water plate is provided with multiple fixing holes corresponding to the fixing columns, and the BDU body is provided with multiple locking holes. The fixing columns pass through the corresponding fixing holes and are fixed to the bracket with the corresponding locking holes through fasteners.

[0015] In the embodiment of the present application, the fixing columns on the bracket, the fixing holes on the cold water plate, and the locking holes of the BDU body are fixed together by fasteners, so that the bracket can support the BDU body in the z direction while also fully exchanging heat with the BDU body, thereby meeting the battery pack space requirements and heat dissipation requirements.

[0016] In some embodiments, the BDU body includes a first BDU body and a second BDU body, and the first BDU body and the second BDU body are spaced apart and arranged on the cold water plate.

[0017] In the embodiment of the present application, the first BDU body and the second BDU body arranged at intervals are each actively cooled by a cold water component, which has a better heat dissipation effect and ensures the performance of the BDU body.

[0018] In some embodiments, a plurality of legs are provided on the side of the bracket, and the legs are fixed to the side panels of the battery module.

[0019] In this embodiment of the application, the fixing column on the bracket, the fixing hole on the cold water plate and the lock of the BDU body

[0020] The fastening holes are fixed together by fasteners, so that the bracket can support the BDU body in the z direction while fully exchanging heat with the BDU body, meeting the battery pack space requirements and heat dissipation requirements.

[0021] In some embodiments, the heat protection assembly includes any one or more of the following high temperature resistant parts:

[0022] Foam, mica board, ceramic rubber composite board.

[0023] In the embodiment of the present application, the cold water plate and the BDU assembly are supported by the top of the bracket. The bracket not only supports the cold water plate and the BDU assembly in the z direction, but also actively cools the BDU assembly with water cooling.

[0024] An embodiment of the present application further provides an electrical device, including: a battery BDU heat dissipation system as described in any of the above embodiments.

[0025] The electric equipment of the embodiment of the present application is configured with the battery BDU heat dissipation system of the above embodiment.

[0026] It can meet the BDU heat dissipation requirements during high-rate fast charging and high-rate charging and discharging, and at the same time is conducive to the miniaturization of the entire battery pack and reduces the space occupied by electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the embodiment of the present application, the embodiment of the present application will be described below.

[0028] The accompanying drawings required for use are briefly introduced. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of a battery BDU system provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the overall installation structure of a battery BDU system provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the installation structure of a battery module and thermal protection assembly of a battery BDU system provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the BDU water cooling assembly installation structure provided in an embodiment of the present application;

[0033] Figure 5 Schematic diagram of the installation structure of the cold water plate and BDU components provided in the embodiment of the present application;

[0034] Figure 6 This is a schematic diagram of the cold water plate structure provided in an embodiment of the present application.

[0035] Icons: 10-battery module; 11-side panel; 101-bottom; 102-top; 20-thermal protection assembly; 21-foam; 22-mica board; 30-bracket; 31-support leg; 32-fixing column; 33-cold water tank; 40-cold water plate; 41-positioning hole; 42-fixing hole; 43-elastic support member; 50-BDU assembly; 51-first BDU body; 52-second BDU body; 53-heat conducting component. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0037] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0038] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of a battery BDU system provided in an embodiment of the present application; Figure 2 A schematic diagram of the overall installation structure of a battery BDU system provided in an embodiment of the present application.

[0039] An embodiment of the present application provides a battery BDU heat dissipation system, including: a battery module 10, a thermal protection component 20, a BDU water cooling component and a BDU component 50.

[0040] The battery module 10 includes a plurality of connected battery cells, and has a bottom 101 and a top 102 in the z-direction and sides in the x-direction.

[0041] The BDU water-cooling assembly is disposed above the battery module 10. For example, the BDU water-cooling assembly is fixedly mounted on the top 102 of the battery module 10, with a gap in the z-direction between the BDU and the battery module 10 to accommodate the thermal protection assembly 20. The BDU water-cooling assembly 30 provides support for the BDU assembly 50 and actively cools the BDU assembly 50 through water cooling.

[0042] The BDU assembly 50 is supported above the BDU water-cooling assembly and in contact with the BDU water-cooling assembly, dissipating heat and cooling the temperature by exchanging heat with the BDU water-cooling assembly. The BDU assembly 50 includes a BDU body, which is the battery disconnect unit (BDU). As a device for disconnecting and connecting high-voltage electricity to the power battery of a new energy vehicle, it is a working unit for high-voltage distribution, disconnection, and short-circuit protection of the battery system. The BDU body is integrated with components such as relays, pre-charge resistors, current sensors, fuses, high-voltage copper busbars, low-voltage connectors, high-voltage voltage sampling connectors, and wiring harness assemblies.

[0043] The thermal protection assembly 20 is located between the battery module 10 and the BDU water-cooling assembly, within the gap between them. It blocks the spray from thermal runaway in the battery module 10, effectively preventing it from spreading to components like the BDU assembly 50 and ensuring battery safety.

[0044] It can be understood that the battery BDU cooling system of the embodiment of the present application has a thermal protection component 20, a BDU water cooling component and a BDU component 50 stacked in sequence on top of the battery module 10 (in the z direction), which fully utilizes the z-direction space of the battery pack, reduces the connection length of the copper busbar, and saves space in the x-direction and y-direction of the battery pack. It not only meets the space requirements of the battery pack, but also can actively cool the BDU component 50 by water cooling to meet the heat dissipation requirements of the BDU component 50, further effectively suppress the spread of thermal runaway through the thermal protection component 20, and also meet the safety requirements of the battery pack, ultimately forming a reliable and stable battery BDU cooling system.

[0045] In some embodiments, reference Figure 1 、 Figure 2 and Figure 4 , Figure 4 This is a schematic diagram of the BDU water-cooling assembly installation structure provided in an embodiment of the present application. The BDU water-cooling assembly includes a bracket 30 and a cold water plate 40. A cold water trough 33 is provided on the upper surface of the bracket 30. The cold water plate 40 is mounted on the bracket 30 and covers the cold water trough 33, forming a cold water flow channel for cold water circulation. The BDU assembly 50 is supported on the cold water plate 40.

[0046] The bracket 30 has a bottom surface (lower surface) facing the heat protection component 20 and a top surface (upper surface) opposite to the bottom surface. A plurality of concave cold water grooves 33 can be formed on the top surface of the bracket 30. The cold water plate 40 is stacked on the top surface of the bracket 30 and covers the cold water grooves 33. The cold water plate 40 and the cold water grooves 33 together constitute a channel for the circulation of cold water. The BDU component 50 is stacked on the cold water plate 40 and contacts the upper surface of the cold water plate 40, thereby achieving heat exchange with the cold water circulating in the cold water circulation to reduce the heat generated by the operation of the BDU component 50. In the embodiment of the present application, the BDU component 50 is actively cooled by water cooling through heat exchange. Compared with the natural passive heat dissipation method, the heat dissipation efficiency is greatly improved, thereby meeting the functional requirements of the BDU component 50.

[0047] In some embodiments, reference Figure 1 、 Figure 2 、 Figure 5 and Figure 6 , Figure 5 Schematic diagram of the installation structure of the cold water plate and BDU components provided in the embodiment of the present application; Figure 6 A schematic diagram of the cold water plate structure provided in an embodiment of the present application is shown. An elastic support member 43 is provided between the cold water plate 40 and the bracket 30 , and the BDU assembly 50 is supported on the cold water plate 40 at a position corresponding to the elastic support member 43 .

[0048] The elastic support member 43 provides elastic support for the BDU assembly 50 on the cold water plate 40. It also allows the BDU assembly 50 to more effectively exchange heat with the cold water in the water-cooling channel. For example, the elastic support member 43 can be made of foamed silicone rubber. Preferably, the foamed silicone rubber has a compressive stress of 30 kPa to meet the requirements for contact with the thermally conductive surface of the BDU assembly 50 and the load-bearing properties of the bracket 30.

[0049] In some embodiments, the BDU assembly 50 includes a BDU body and a heat-conducting component 53. The heat-conducting component 53 is arranged between the BDU body and the cold water plate 40, and is in contact with the BDU body and the cold water plate 40. The position of the heat-conducting component 53 corresponds to the position of the elastic support member 43. The heat-conducting component 53 absorbs the heat generated by the BDU body and transfers it to the elastic support member 43 through the cold water plate 40. The elastic support member 43 exchanges heat with the cold water in the water-cooling channel. The heat-conducting component 53 cooperates with the elastic support member 43 to improve the heat conduction efficiency and achieve a significant heat dissipation effect. In one example, the heat-conducting component is a thermal pad or a thermal adhesive. Preferably, the thermal adhesive is a thermal conductive structural adhesive such as acrylic thermal conductive structural adhesive, epoxy thermal conductive structural adhesive, thermal conductive gel, or other thermal conductive filler, and the thermal conductivity coefficient is preferably 1.2w / mk-2w / mk.

[0050] In one example, the BDU body includes a first BDU body 51 and a second BDU body 52, which are spaced apart on the cold water plate 40. The first BDU body 51 can be the BDU main positive terminal, and the second BDU body 52 can be the BDU main negative terminal. The aforementioned heat conduction component 53 can be disposed between the first BDU body 51 and the cold water plate 40, and between the second BDU body 52 and the cold water plate 40, respectively. The spaced-apart first and second BDU bodies 51, 52 are each actively cooled by the cold water assembly, resulting in improved heat dissipation and ensuring BDU performance.

[0051] In some embodiments, reference Figure 1-Figure 5 The bracket 30 is provided with a plurality of fixing columns 32, and the cold water plate 40 is provided with a plurality of fixing holes 42 corresponding to the fixing columns 32. The BDU body is provided with a plurality of locking holes 54 ( Figure 2 As shown), the fixing column 32 passes through the corresponding fixing hole 42 and the corresponding locking hole 54 through fasteners to fix the BDU body to the bracket 30.

[0052] When placing the cold water plate 40 on the bracket 30, align the fixing holes 42 on the cold water plate 40 with the fixing columns 32 on the bracket 30. For example, positioning can be performed through the main positioning holes 41 on the cold water plate 40. Then, the cold water plate 40 is placed on the top surface of the bracket 30. At this time, the fixing columns 32 on the bracket 30 pass through the corresponding fixing holes 42. When installing the BDU body on the bracket 30, align the locking holes 54 of the BDU body with the corresponding fixing columns 32. Then, the BDU body is locked to the bracket 30 by fasteners such as bolts, and the BDU body is placed on the cold water plate 40 so as to be in full contact with the upper surface of the cold water plate 40. In the embodiment of the present application, the fixing columns 32 on the bracket 30, the fixing holes 42 on the cold water plate 40, and the locking holes 54 of the BDU body are fixed together by fasteners, so that the bracket 30 can fully exchange heat with the BDU body while supporting the BDU body in the z direction, thereby meeting the battery pack space requirements and heat dissipation requirements.

[0053] Further optionally, a buffer pad is preferably provided at the locking hole 54 of the BDU body to absorb vibration impact.

[0054] In some embodiments, reference Figure 2 and Figure 4 , Figure 4Schematic diagram of the BDU water cooling assembly installation structure provided in an embodiment of the present application. A plurality of legs 31 are provided on the side of the bracket 30, and the legs 31 are fixed to the side panels 11 of the battery module 10. A plurality of legs 31 can be provided on both sides of the bracket 30 in the x-direction. The bracket 30 is arched as a whole and supported above the top of the battery module 10. The bracket 30 supports the cold water plate 40 and the BDU assembly 50 at the top. The bracket 30 not only supports the cold water plate 40 and the BDU assembly 50 in the z-direction, but also actively cools the BDU assembly 50 by water cooling.

[0055] In some embodiments, the bracket 30 and the cold water plate 40 may be made of steel B340 / 590DP, preferably with a yield strength ≥ 340 MPa, a tensile strength ≥ 590 MPa, and an elongation at break ≥ 20%, to meet lightweight and strength requirements.

[0056] In some embodiments, reference Figure 1 and Figure 3 , Figure 3 A schematic diagram of the structural installation of a battery module and a thermal protection component of a battery BDU system provided in an embodiment of the present application. The thermal protection component 20 includes any one or more of the following high-temperature resistant parts: foam, mica board, ceramic rubber composite board. For example, the thermal protection component 20 includes foam 21 and mica board 22, and the foam 21 is located on both sides of the mica board 22 in the x direction. The foam preferably uses double-sided adhesive to facilitate assembly pre-positioning and adhesion fixation. The mica board or the mica board and ceramic silicone rubber composite material preferably has a tensile strength of ≥140Mpa and is burned at 1300°C for 30 minutes, so as to ensure that heat spread is suppressed during thermal runaway.

[0057] In summary, in a preferred embodiment of the embodiment of the present application, a thermal protection component 20, a current and relay fuse distribution component (BDU main positive and BDU main negative), and a BDU cold water heat exchange component are integrated above the battery module. When the XY direction space in the battery pack is limited, the above-mentioned thermal protection component 20, the current and relay fuse distribution component (BDU main positive and BDU main negative), and the BDU cold water heat exchange component are placed above the battery module 10, making full use of the Z direction space above the battery module 10, meeting the space requirements while providing protection measures for the thermal runaway heat spread of the battery. The BDU is mounted on the bracket 30 by means of the fixed column of the bracket 30, and the BDU is elastically supported by the elastic support member at the bottom of the cold plate. The cold plate and the BDU are fitted with a thermal pad to achieve a high heat exchange efficiency. During installation, they can be assembled in a stacked layer structure, such as bolt installation, which is convenient for disassembly and maintenance. The entire system is firm and reliable, and has been verified by actual measurements to meet various vibration tests, road tests, electrical performance tests, and thermal management performance tests.

[0058] The present application also provides an electrical device, including the battery BDU cooling system described in any of the above embodiments. The electrical device may be an electric vehicle, such as a pure electric vehicle or a plug-in hybrid electric vehicle. The electrical device may also be a ship, a mobile power supply, or the like.

[0059] The electrical equipment of the embodiment of the present application, by configuring the battery BDU heat dissipation system of the above embodiment, can meet the BDU heat dissipation requirements during high-rate fast charging and high-rate charging and discharging, and at the same time is conducive to the miniaturization of the entire battery pack and reduces the space occupied by the electrical equipment.

[0060] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0061] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0062] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0063] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0064] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0065] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A battery BDU cooling system, characterized in that: include: Battery modules; A BDU water cooling assembly is provided on and above the battery module; A BDU assembly, supported above the BDU water cooling assembly; and a heat protection assembly disposed between the battery module and the BDU water cooling assembly; the BDU water cooling assembly comprises a bracket and a cold water plate, the upper surface of the bracket being provided with a cold water trough, the cold water plate being disposed on the bracket and covering the cold water trough to form a cold water flow channel for cold water circulation; the BDU assembly is supported on the cold water plate; The bracket is provided with a plurality of fixing columns, and the cold water plate is provided with a plurality of fixing holes corresponding to the fixing columns; The BDU assembly includes a BDU body, which is provided with multiple locking holes. The fixing columns pass through the corresponding fixing holes and are fixed to the bracket via fasteners with the corresponding locking holes. The BDU body includes a first BDU body and a second BDU body, which are spaced apart and arranged on the cold water plate.

2. The battery BDU heat dissipation system according to claim 1, characterized in that: An elastic support member is provided between the cold water plate and the bracket. The BDU assembly is located on the cold water plate at a position corresponding to the elastic support member.

3. The battery BDU heat dissipation system according to claim 2, characterized in that: The BDU assembly further includes a heat conducting component, which is disposed between the BDU body and the cold water plate and contacts the BDU body and the cold water plate.

4. The battery BDU heat dissipation system according to claim 3, characterized in that: The heat-conducting component is a heat-conducting pad or heat-conducting glue.

5. The battery BDU heat dissipation system according to claim 1, characterized in that: A plurality of legs are provided on the side of the bracket, and the legs are fixed to the side plates of the battery module. A gap is formed between the bracket and the top of the battery module, and the heat protection component is located in the gap.

6. The battery BDU cooling system according to any one of claims 1 to 5, characterized in that: The heat protection component includes any one or more of the following high temperature resistant parts: foam, mica board, ceramic rubber composite board.

7. An electrical device, characterized in that: include: The battery BDU cooling system according to any one of claims 1 to 6.

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