BDU structure and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a BDU structure and a battery pack. The BDU structure comprises a liquid cooling plate, an upper cover, a BDU and a pouring sealant, and a heat exchange medium circulates in the liquid cooling plate; the upper cover is buckled with the liquid cooling plate and forms a mounting space together with the liquid cooling plate; the BDU is installed on the liquid cooling plate and located in the installation space. The pouring sealant is poured in the installation space, wraps at least part of the BDU and is configured to absorb heat of the BDU. According to the BDU structure and the battery pack, the liquid cooling plate is arranged, and the pouring sealant is poured in the upper cover, so that the traditional air-cooled heat dissipation in the BDU structure is replaced by liquid cooling plate heat dissipation, and meanwhile, the pouring sealant can absorb heat of electrical elements in the BDU and transmit the heat to the liquid cooling plate or the upper cover, so that the heat is taken away more quickly; and the liquid cooling plate can also be used as a bottom plate of the BDU structure, so that one piece has multiple purposes, the space is saved, and meanwhile, the heat dissipation speed is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a BDU structure and a battery pack. Background Art

[0002] At present, based on the considerations of technology, process maturity and processing cost, the air-cooled BDU (Battery Disconnect Unit) structure scheme in the battery pack is adopted more frequently. However, limited by the BDU structure layout and the air-cooled heat dissipation method, the temperature of the electrical components in the BDU is still relatively high under harsh working conditions, and in severe cases, it will affect the service life of the electrical components.

[0003] Therefore, it is urgent to design a BDU structure and a battery pack to solve the above problems. Summary of the Utility Model

[0004] An object of the utility model is to provide a BDU structure with a heat dissipation method that saves space and has a faster heat dissipation speed.

[0005] Another object of the utility model is to provide a battery pack, in which the BDU structure occupies a small area, has a better heat dissipation effect and a longer service life.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The BDU structure includes:

[0008] A liquid cooling plate, in which a heat exchange medium flows;

[0009] An upper cover, which is buckled with the liquid cooling plate and jointly forms an installation space with the liquid cooling plate;

[0010] A BDU, which is installed on the liquid cooling plate and located in the installation space;

[0011] Potting glue, which is potted in the installation space and wraps at least part of the BDU, and the potting glue is configured to absorb the heat of the BDU.

[0012] As an optional solution, the potting glue is a structural glue.

[0013] As an optional solution, heat dissipation holes are opened at the top of the upper cover.

[0014] As an optional solution, the BDU structure further includes a thermal conductive glue, and the thermal conductive glue is located between the potting glue and the liquid cooling plate.

[0015] As an alternative solution, the above BDU structure further includes a temperature sensor configured to detect the temperatures of the liquid cooling plate, the upper cover, and the potting glue, and the temperature sensor is communicatively connected to an early warning device.

[0016] As an alternative solution, an insulating layer is coated on the top surface of the liquid cooling plate. The BDU includes a plurality of electrical components, and a plurality of studs are provided on the liquid cooling plate for mounting the electrical components.

[0017] As an alternative solution, the open end of the upper cover and the liquid cooling plate are sealed with a sealant.

[0018] A battery pack includes a box body, a battery cell assembly, and the above BDU structure. The battery cell assembly is accommodated in the box body, and the BDU structure is mounted on the box body.

[0019] As an alternative solution, the above BDU structure is located outside the box body.

[0020] As an alternative solution, the battery cell assembly includes a plurality of battery cell modules, and a CCS assembly is provided on each battery cell module, and the CCS assemblies are electrically connected through fuses.

[0021] The beneficial effects of the present utility model are as follows:

[0022] The present utility model provides a BDU structure. By providing a liquid cooling plate and potting glue in the upper cover, the traditional air-cooled heat dissipation in the BDU structure is replaced with liquid cooling plate heat dissipation. At the same time, the potting glue can absorb the heat of the electrical components in the BDU and transfer it to the liquid cooling plate or the upper cover, so that the heat can be taken away faster. With the above arrangement, the liquid cooling plate can also serve as the bottom plate of the BDU structure, serving multiple purposes with one component, saving space, and having a faster heat dissipation speed.

[0023] The present utility model further provides a battery pack, which includes a box body, a battery cell assembly, and the above BDU structure. The battery cell assembly is accommodated in the box body, and the BDU structure is mounted on the box body. By adopting the above BDU structure, the battery pack has a smaller overall occupied space, faster heat dissipation, and a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an exploded view of the BDU structure provided by an embodiment of the present utility model;

[0025] Figure 2 is a schematic structural view of the battery pack provided by an embodiment of the present utility model with the upper cover removed.

[0026] In the figure:

[0027] 100. BDU structure;

[0028] 10. Liquid cooling plate;

[0029] 20. Upper cover; 21. Heat dissipation holes;

[0030] 50. Thermal conductive adhesive; 60. Temperature sensor; 70. Sealant;

[0031] 200. Box body;

[0032] 300. Battery cell assembly; 310. Battery cell module; 320. CCS assembly; 330. Fuse. Specific embodiments

[0033] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the top", and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below the bottom", and "under the bottom" of the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0036] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0037] This embodiment provides a BDU structure 100. The heat dissipation method of this BDU structure 100 saves space and has a faster heat dissipation speed. As Figure 1 shown, the BDU structure 100 includes a liquid cooling plate 10, an upper cover 20, a BDU, and potting glue (not shown). A heat exchange medium flows in the liquid cooling plate 10; the upper cover 20 is buckled with the liquid cooling plate 10 and jointly forms an installation space with the liquid cooling plate 10; the BDU is installed on the liquid cooling plate 10 and is located in the installation space; the potting glue is potted in the installation space and wraps at least part of the BDU. The potting glue is configured to absorb the heat of the BDU. For this BDU structure 100, by setting the liquid cooling plate 10 and potting glue in the upper cover 20, the traditional air-cooled heat dissipation in the BDU structure 100 is replaced with the heat dissipation of the liquid cooling plate 10. At the same time, the potting glue can absorb the heat of the electrical components in the BDU and transfer it to the liquid cooling plate 10 or the upper cover 20, so that the heat can be taken away faster. With the above settings, the liquid cooling plate 10 can also be used as the bottom plate of the BDU structure 100, serving multiple purposes with one component, saving space and having a faster heat dissipation speed.

[0038] Among them, the BDU includes a variety of electrical components, including but not limited to a main positive relay, a main negative relay, a pre-charge relay, a pre-charge resistor, a fuse, a current sensor, a power-off switch, a charge and discharge interface, a high-voltage acquisition board, and a main control board, etc. The connection methods of the various electrical components are conventional settings for those skilled in the art and will not be elaborated here.

[0039] Optionally, the material of the potting glue is silicone potting glue. This potting glue has a certain thermal conductivity, generally about 2W / mk. At the same time, this potting glue has certain heat absorption and heat equalization functions, and can absorb the heat inside the BDU to achieve the effect of dissipating the heat of the BDU to the potting glue and then to the liquid cooling plate 10 or the upper cover 20.

[0040] Optionally, the potting glue is a structural adhesive. That is to say, while the potting glue conducts heat, it can also assist in improving the installation stability of the electrical components, ensuring the stability of the various electrical components when the BDU structure 100 is impacted, and thus extending the service life of the BDU structure 100.

[0041] Optionally, an insulating layer is coated on the top surface of the liquid cooling plate 10, and a plurality of studs are provided on the liquid cooling plate 10 for installing electrical components. This setting can facilitate the installation of electrical components. Among them, there is a flow channel for the coolant to flow inside the liquid cooling plate 10, and this channel is U-shaped and circuitous. The inlet and outlet nozzles of the liquid cooling plate 10 are connected to the inlet and outlet water pipes of the battery pack. The liquid cooling plate 10 is the main heat dissipation channel for the BDU, and its material is aluminum alloy material, which has a certain strength. The liquid cooling plate 10 itself also has installation holes. Therefore, this liquid cooling plate 10 has the functions of providing strength, heat dissipation, and installation for electrical components.

[0042] Optionally, as Figure 1 shown, the BDU structure 100 further includes a thermal conductive adhesive 50, and the thermal conductive adhesive 50 is located between the potting compound and the liquid cooling plate 10. With the above arrangement, heat is transferred from the electrical component to the potting compound and then to the liquid cooling plate 10 through the thermal conductive adhesive 50. The heat conduction speed of the thermal conductive adhesive 50 is greater than that of the potting compound, resulting in a faster heat conduction speed. Optionally, the material of the thermal conductive adhesive 50 is silicone, and the thickness is 1 mm - 2 mm.

[0043] Optionally, a thermal conductive adhesive 50 is also filled between the BDU and the cold plate. It can be understood that the thermal conductive adhesive 50 between the mounting plate of the BUD and the cold plate enables the heat of the BDU to be quickly conducted from below to the liquid cooling plate 10, and the thermal conductive adhesive 50 between the potting compound and the liquid cooling plate 10 enables the heat above the BUD to reach the liquid cooling plate 10 via the potting compound and the thermal conductive adhesive 50.

[0044] Among them, the mounting plate of the BUD and the liquid cooling plate 10 are installed and fixed through a locking member. During the installation process, the thermal conductive adhesive 50 can be first laid on the cold plate. At this time, the thermal conductive adhesive 50 accumulates together due to its certain viscosity, and then the mounting plate of the BDU is placed on the thermal conductive adhesive 50 to make the thermal conductive adhesive 50 level, and then the locking member is locked. Specifically, the locking member passes through the mounting plate of the BDU and the cold plate to lock the two, and during this process, the thermal conductive adhesive 50 is squeezed open.

[0045] Optionally, as Figure 1As shown, the BDU structure 100 further includes a temperature sensor 60 configured to detect the temperatures of the liquid cooling plate 10, the upper cover 20, and the potting compound. The temperature sensor 60 is communicatively connected to an early warning device. Among them, the early warning device can be installed inside the BDU structure 100 or on the battery pack housing 200. Optionally, the early warning device can be a buzzer or a warning light, etc., which is not limited herein. It can be understood that at least three temperature sensors 60 are provided in the BDU structure 100. The three temperature sensors 60 are respectively used to measure the temperatures of the liquid cooling plate 10, the upper cover 20, and the potting compound, and each temperature sensor 60 is set with three warning temperatures. When any temperature sensor 60 reaches the first warning temperature, the battery pack reduces the output power. When any temperature sensor 60 reaches the second warning temperature, the battery pack further reduces the output power. When any temperature sensor 60 reaches the third warning temperature, the battery pack cuts off the main circuit and stops outputting power to prevent the battery pack from exploding due to high temperature. Among them, the first warning temperature, the second warning temperature, and the third warning temperature gradually increase. Through the above settings, it can ensure that the overall temperature of the battery pack is within a safe range. Optionally, the temperature sensor 60 performs detection every preset time, and the preset time can be flexibly changed according to requirements. Preferably, the preset time is 1 s, which is short enough to facilitate timely warning in case of a sudden increase in temperature. It should be noted that the above operations are communicatively connected through the main control board, and the connection method is the prior art, which will not be elaborated herein.

[0046] Optionally, as Figure 1 shown, heat dissipation holes 21 are provided at the top of the upper cover 20, which can dissipate part of the heat into the air and further improve the heat dissipation speed. Optionally, the upper cover 20 is a plastic part, which has sufficient strength and light weight and will not cause pressure damage to the liquid cooling plate 10.

[0047] Among them, the upper cover 20 is in a trough shape with one end open and can accommodate a plurality of electrical components.

[0048] Optionally, as Figure 1 shown, the open end of the upper cover 20 and the liquid cooling plate 10 are sealed by a sealant 70. Among them, the sealant 70 is made of silica gel material, which can completely seal the liquid cooling plate 10 and the upper cover 20. The upper cover 20 will not fall off during long-term use, and water droplets and dust cannot enter from the bottom. The thickness of the sealant 70 is between 5 mm and 8 mm, and the width is about 10 mm, which can achieve good sealing and will not occupy too much space in the vertical direction.

[0049] This embodiment also provides a battery pack, as Figure 2As shown in the figure, the battery pack includes a box body 200, a battery cell assembly 300, and the above-mentioned BDU structure 100. The battery cell assembly 300 is accommodated in the box body 200, and the BDU structure 100 is installed on the box body 200. By adopting the above-mentioned BDU structure 100, the battery pack occupies less space overall, has faster heat dissipation, and a longer lifespan.

[0050] Optionally, as Figure 2 shown, the BDU structure 100 is located outside the box body 200. When there is a problem with the BDU structure 100, it is not necessary to disassemble the box body 200, which facilitates later maintenance, reduces the cost of later maintenance, and is convenient for replacing the main control board.

[0051] In this embodiment, Figure 2 the upper cover 20 of the box body 200 is hidden, and the BDU structure 100 is installed on the upper cover 20. In other embodiments, the BDU structure 100 can also be installed on the side of the box body 200, which is not limited herein.

[0052] Optionally, the battery cell assembly 300 includes a plurality of battery cell modules 310, and each battery cell module 310 is provided with a CCS component 320. The CCS components 320 are electrically connected by fuses 330. When a large current occurs, the fuses 330 can quickly blow to prevent safety problems inside the battery pack.

[0053] Optionally, the battery pack further includes a plastic bracket. The battery cell module 310 includes a plurality of battery cells, and the battery cells are installed on the bracket. Through the above arrangement, there is no single module in the battery pack, eliminating the need for a module tray, increasing the integration of the battery pack, and improving the volume utilization rate. Specifically, the battery cells are installed on the bracket in a bonded form. Optionally, the bracket is made of plastic, with high hardness and light weight.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. BDU structure, characterized by: include: A liquid cooling plate (10), wherein a heat exchange medium flows through the liquid cooling plate (10) and can serve as a bottom plate of the BDU structure; An upper cover (20) is buckled with the liquid cooling plate (10) and forms an installation space together with the liquid cooling plate (10); A BDU, the BDU comprising a plurality of electrical components, the plurality of electrical components being mounted on the liquid cooling plate (10) and located in the mounting space; A potting compound is potted in the installation space and wraps at least a portion of the BDU, wherein the potting compound is configured to absorb heat of the BDU.

2. The BDU structure according to claim 1, characterized in that: The potting glue is a structural glue.

3. The BDU structure according to claim 1, characterized in that: A heat dissipation hole (21) is provided on the top of the upper cover (20).

4. The BDU structure according to any one of claims 1 to 3, characterized in that: The BDU structure also includes a heat-conducting adhesive (50), and the heat-conducting adhesive (50) is located between the potting adhesive and the liquid cooling plate (10).

5. The BDU structure according to any one of claims 1 to 3, characterized in that: The BDU structure further comprises a temperature sensor (60), wherein the temperature sensor (60) is configured to detect the temperatures of the liquid cooling plate (10), the upper cover (20) and the potting glue, and the temperature sensor (60) is communicatively connected to the early warning device.

6. The BDU structure according to any one of claims 1 to 3, characterized in that: The top surface of the liquid cooling plate (10) is coated with an insulating layer, and a plurality of studs are arranged on the liquid cooling plate (10), and the studs are used to install the electrical components.

7. The BDU structure according to any one of claims 1 to 3, characterized in that: The open end of the upper cover (20) and the liquid cooling plate (10) are sealed by a sealant (70).

8. A battery pack, characterized in that: It comprises a box (200), a battery cell assembly (300), and a BDU structure as claimed in any one of claims 1 to 7, wherein the battery cell assembly (300) is accommodated in the box (200), and the BDU structure is installed on the box (200).

9. The battery pack according to claim 8, characterized in that: The BDU structure is located outside the box (200).

10. The battery pack according to claim 9, characterized in that: The battery cell assembly (300) comprises a plurality of battery cell modules (310), each of the battery cell modules (310) is provided with a CCS assembly (320), and the CCS assemblies (320) are electrically connected to each other via fuses (330).

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