Battery pack bottom protection plate, battery pack and vehicle

Abstract

The invention discloses a battery pack bottom protection plate, a battery pack and a vehicle, and belongs to the technical field of vehicle engineering. The battery pack bottom protection plate comprises a plate body, a flow guide through groove is formed in the plate face of one side of the plate body, and a first notch and a second notch are formed in the two ends of the flow guide through groove respectively; the first turning plate is rotatably arranged in the first notch so as to adjust the opening degree of the first notch; the second turning plate is rotatably arranged in the second notch so as to adjust the opening degree of the second notch; the driving mechanism is connected with the first turning plate and the second turning plate so as to synchronously adjust the rotation amplitude of the first turning plate and the rotation amplitude of the second turning plate. According to the battery pack bottom protection plate, the battery pack and the vehicle, the heat dissipation effect and the cooling energy efficiency of the battery pack can be improved.

Description

Technical Field

[0001] This application belongs to the field of vehicle engineering technology, and in particular relates to a battery pack bottom protection plate, a battery pack, and a vehicle. Background Technology

[0002] The lower housing of the power battery pack in new energy vehicles houses the cell modules, and heat exchange elements such as cold plates are installed at the bottom of the cell modules to regulate the operating temperature of the cells, ensuring their performance and safety. Typically, a bottom protective plate is also installed at the bottom of the lower housing to cover and protect the cold plates, reducing the impact of external impacts and corrosion.

[0003] Typically, to achieve stable and reliable impact resistance and protection against external corrosion, the bottom protective plate uses a large-area full-coverage method to completely enclose the cold plate and battery cell module within the lower casing. This results in unsatisfactory cooling performance of the cold plate, especially when the external ambient temperature is lower than the temperature of the cold plate (and the internal cooling medium). The existing structure hinders heat dissipation to some extent, leading to low cooling efficiency. Summary of the Invention

[0004] This application provides a battery pack bottom protection plate, a battery pack, and a vehicle, aiming to at least partially solve the technical problems of unsatisfactory heat dissipation and low cooling efficiency of the battery pack. Therefore, One aspect of this application provides a battery pack bottom protection plate, comprising: The plate body has a flow guide groove on one side of the plate body, and the two ends of the flow guide groove are respectively set as a first groove and a second groove. The first flap is rotatably disposed in the first slot to adjust the opening of the first slot; The second flap is rotatably disposed within the second slot to adjust the opening of the second slot; A drive mechanism is connected to the first flap and the second flap respectively to synchronously adjust the rotation amplitude of the first flap and the second flap.

[0005] In some embodiments, the drive mechanism includes: A drive motor is mounted on the plate. The drive shaft is connected to the rotor shaft of the drive motor and the first flap. A transmission assembly is connected to the drive shaft and the second flap to synchronously drive the second flap to rotate during the rotation of the drive shaft.

[0006] In some embodiments, the drive shaft is rotatably disposed through the plate body, and the drive shaft is connected to the rotating shaft of the first flap.

[0007] In some embodiments, the drive shaft and the first flap are integrated, and the drive shaft is configured as the rotating shaft of the first flap.

[0008] In some embodiments, the transmission assembly includes: The first swing arm is coaxially fixed to the drive shaft; A transmission link, the first end of which is hinged to the first swing arm; The second swing arm is coaxially fixed to the rotating shaft of the second flap, and the second swing arm is also hinged to the transmission link.

[0009] In some embodiments, the middle part of the first swing arm is connected to the drive shaft, the middle part of the second swing arm is connected to the rotating shaft of the second flap, and there are two transmission links arranged in parallel, with the first swing arm and the second swing arm arranged in parallel.

[0010] In some embodiments, the edges of the first flap and / or the second flap are provided with seals.

[0011] In some embodiments, the rotation center line of the first flap coincides with the symmetry center axis of the first flap; And / or, the rotation center line of the second flap coincides with the symmetry center axis of the second flap.

[0012] Another aspect of this application embodiment also provides a battery pack, including the aforementioned battery pack bottom protective plate.

[0013] In another aspect of this application, a vehicle is also provided, including the aforementioned battery pack.

[0014] The embodiments of this application have at least the following beneficial effects: The battery pack bottom guard plate, battery pack, and vehicle provided in this application embodiment include a plate body, a first flap, a second flap, and a drive mechanism. A flow guide groove is formed on one side of the plate body, and the two ends of the groove are set as a first groove and a second groove. The first flap and the second flap are rotatably disposed in the first groove and the second groove and are connected to the drive mechanism for transmission. Thus, they can be rotated under the drive of the drive mechanism to adjust the opening of the first groove and the second groove, introduce air jets with different flow rates, enhance the heat exchange of the cold plate in the battery pack, thereby improving the cooling efficiency and improving the cooling energy efficiency of the battery pack to a certain extent. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This paper shows a schematic diagram of the overall structure of the battery pack bottom cover plate in an embodiment of this application; Figure 2 It shows Figure 1 A schematic diagram of the drive mechanism for the bottom protective plate of the battery pack; Figure 3 It shows Figure 1 A schematic diagram of the guiding channel, driving mechanism and first flap in the middle; Figure 4 It shows Figure 1 Another angle structural diagram of the drive mechanism of the battery pack bottom guard plate; Figure 5 It shows Figure 1 A schematic diagram of the drive mechanism, guide channel, and second flap in the middle; Figure 6 It shows Figure 1 A schematic diagram of the structure of the bottom protective plate of the battery pack; Figure 7 It shows Figure 1 A schematic diagram of the assembly state of the battery pack bottom guard plate and the cold plate.

[0017] Figure label: 1-Plate body, 11-Guiding groove, 111-First groove, 112-Second groove; 2-First flip board; 3-Second flip-flop; 4-Drive mechanism, 41-Drive motor, 42-Drive shaft, 43-Transmission assembly, 431-First swing arm, 432-Transmission link, 433-Second swing arm; 5-Cold plate. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0020] This application is described below with reference to the accompanying drawings and specific embodiments: A cold plate is installed at the bottom of the battery pack's cell modules to circulate cooling medium and exchange heat with the cell modules, thereby ensuring stable internal battery temperature. Typically, to reduce the impact of collisions and external corrosion on the cell modules, a foam buffer layer and a bottom protective plate are also layered under the cold plate for comprehensive protection. However, this also results in less than ideal heat exchange between the cold plate and the external environment, especially at low ambient temperatures, where thermal resistance can easily form, affecting heat exchange efficiency.

[0021] Therefore, this application provides a battery pack bottom protection plate, a battery pack, and a vehicle, which aims to solve the technical problems of unsatisfactory heat dissipation and low cooling efficiency of the battery pack to at least a certain extent.

[0022] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the battery pack bottom guard plate is set at the bottom of the lower housing of the battery pack (with the battery pack arranged vertically with the vehicle as the conventional arrangement), mainly to deal with bottom impact and erosion, and through structural design, to establish an openable air-cooling channel under some working conditions to enhance the heat exchange and cooling effect.

[0023] The battery guard plate includes: a plate body 1, a first flap 2, a second flap 3, and a driving mechanism 4; the first flap 2 and the second flap 3 are rotatably connected to the plate body 1, and the driving mechanism 4 is connected to the first flap 2 and the second flap 3.

[0024] The plate 1 serves as the main protective and airflow guiding element, positioned at the bottom of the battery pack to cover the protective cold plate 5 and the bottom end of the lower housing. Furthermore, a flow guiding groove 11 is provided on one side of the plate 1, with a first opening 111 and a second opening 112 at its two ends. Airflow can enter the flow guiding groove 11 through one of the first opening 111 and the second opening 112, and exit through the other, thereby carrying away heat from the cold plate 5, enhancing heat exchange, and improving heat exchange efficiency.

[0025] The first flap 2 is configured as a sealing member for the first slot 111. By covering and shielding the first slot 111 with the plate surface, it blocks debris and airflow from entering. At the same time, the first flap 2 is rotatably disposed in the first slot 111, so that the opening of the first slot 111 can be adjusted by rotation, and the airflow can be controlled, thereby adjusting the cooling efficiency to a certain extent.

[0026] The second flap 3 is configured as a sealing member for the second slot 112. By covering and shielding the second slot 112 with the plate surface, it blocks debris and airflow from entering. At the same time, the second flap 3 is rotatably disposed in the second slot 112, so that the opening of the second slot 112 can be adjusted by rotation, and the airflow can be controlled, thereby adjusting the cooling efficiency to a certain extent.

[0027] The drive mechanism 4 serves as a rotation drive structure and is connected to the first flap 2 and the second flap 3 respectively, so as to synchronously adjust the rotation amplitude of the first flap 2 and the second flap 3, thereby improving ventilation efficiency.

[0028] In some embodiments, the guide channel 11 is recessed into one side of the plate surface, or is bent and stamped to form a groove shape, and the channel extends through the entire plate surface along the plate surface direction, forming a Z-shaped plate structure. The plate 1 is fastened and installed on the bottom end of the lower casing of the battery pack, thereby forming a closed channel structure using the cold plate 5 and the guide channel 11.

[0029] In some embodiments, the drive mechanism 4 includes: a drive motor 41, a drive shaft 42, and a transmission assembly 43; the drive motor 41 is a power mechanism that outputs torque; the drive shaft 42 is connected to the rotor shaft of the drive motor 41 and the first flap 2, thereby driving the first flap 2 to rotate; the transmission assembly 43 is connected to the drive shaft 41 and the second flap 3 to transmit the torque of the drive motor 41 and drive the second flap 3 to rotate.

[0030] The drive shaft 42 and the transmission assembly 43 work together to synchronously drive the second flap 3 and the first flap 2 to rotate, thereby achieving efficient adjustment of the flow channel opening and cooling efficiency.

[0031] In some embodiments, the first flap 2 is provided with a rotating shaft and is stably rotatably connected to the first slot 111 via the rotating shaft; the second flap 3 is provided with a rotating shaft and is stably rotatably connected to the second slot 112 via the rotating shaft.

[0032] Generally, the rotating shafts of the first flap 2 and the second flap 3 can be directly embedded in the side walls of the guide channel 11.

[0033] In some embodiments, for ease of assembly, the transmission assembly 43 and the drive motor 41 are disposed on the outside of the battery pack, such as directly on the outside of the plate 1.

[0034] Accordingly, the drive shaft 42 is rotatably mounted through the plate 1, and the drive shaft 42 is connected to the rotating shaft of the first flap 2. That is, the drive shaft 42 acts as a torque transmission component, directly driving the first flap 2 and the second flap 3.

[0035] In some embodiments, in order to simplify the transmission structure, the drive shaft 42 may be integrated with the first flap 2, and the drive shaft 42 may be configured as the rotating shaft of the first flap 2.

[0036] The rotating shaft of the second flap 3 can also be directly inserted into the plate body 1, and specifically inserted into the two side walls of the guide channel 11.

[0037] In some embodiments, the transmission assembly 43 employs a linkage mechanism to achieve stable torque transmission over long strokes. Specifically, the transmission assembly 43 includes a first swing arm 431, a transmission link 432, and a second swing arm 433.

[0038] The first swing arm 431 is coaxially fixed to the drive shaft 42, thereby rotating synchronously with the drive shaft 42. The second swing arm 433 is coaxially fixed to the rotating shaft of the second flap 3. The two ends of the transmission link 432 are respectively hinged to the first swing arm 431 and the second swing arm 433.

[0039] When the drive shaft 42 rotates, it drives the first swing arm 431 to rotate, and pulls the second swing arm 432 to rotate through the transmission link 432.

[0040] In some embodiments, to enhance the reliability of the linkage transmission, the transmission assembly 43 may adopt a four-bar structure, that is, the transmission link 432 consists of two links that form a quadrilateral link structure with the first swing arm 431 and the second swing arm 433.

[0041] Specifically, the middle part of the first swing arm 431 can be connected to the drive shaft 42, the middle part of the second swing arm 432 is connected to the rotating shaft of the second flap 3, and the two transmission connecting rods 432 are arranged in parallel. The first swing arm 431 and the second swing arm 432 are arranged in parallel, so that the transmission force is stable.

[0042] In some embodiments, the edges of the first flap 2 and / or the second flap 3 are provided with sealing elements to achieve a stable sealed connection with the plate body 1 and the battery pack.

[0043] In some embodiments, the pivots of the first flap 2 and the second flap 3 can be arranged on the symmetrical central axis of the first flap 2 and the second flap 3, so that the rotation directions on both sides are opposite, enabling rapid opening and closing during rotation and improving adjustment efficiency.

[0044] In other words, the rotation center line of the first flap 2 coincides with the symmetry center axis of the first flap 2; the rotation center line of the second flap 3 coincides with the symmetry center axis of the second flap 3.

[0045] In some embodiments, the power element of the drive mechanism may also be configured as other drive elements such as an electric push rod, which is directly hinged to the first swing arm 431 to drive it to rotate.

[0046] The transmission component 43 adopts other forms of solutions such as gear transmission components.

[0047] In another aspect of this application embodiment, a battery pack is also provided, including the battery pack bottom protective plate, wherein the flow channel 11 covers the area where the cold plate 5 is located.

[0048] During operation, the opening degrees of the first flap 2 and the second flap 3 are adjusted according to the ambient temperature and the battery pack's operating conditions; the initial state is when the first slot 111 and the second slot 112 are closed. Generally, mode control can be implemented according to the following basic control logic.

[0049] In low-temperature environments, when the battery pack needs to be heated, the first flap 2 and the second flap 3 are kept closed, forming an air layer between the cold plate and the bottom protective plate. Because air itself has a low thermal conductivity, it has high thermal resistance in a closed configuration, preventing heat transfer to the environment.

[0050] In high-temperature environments, when the battery pack dissipates heat, the first flap 2 and the second flap 3 are kept closed, forming an air layer between the cold plate and the bottom protective plate, establishing thermal resistance, and preventing the cold plate from exchanging a large amount of heat with the environment.

[0051] When the ambient temperature is low, the battery is discharging at a low charge level, and the heat generation power is low, the first flap 2 and the second flap 3 can be turned on, allowing the battery heat to be directly transferred to the environment through the airflow in the cold plate 5 and the guide channel 11. At this time, it is not necessary to turn on the compressor or water pump that works with the cold plate to complete the battery heat dissipation, which can significantly reduce energy consumption.

[0052] When the ambient temperature is low and the actual battery heating power is slightly high, the water pump can be turned on for self-circulation (without passing through the heat exchanger). At the same time, the first flap 2 and the second flap 3 are turned on to allow the coolant to circulate inside the cold plate 5. Meanwhile, the coolant exchanges heat with the air through the cavity of the bottom guard plate to achieve cooling. In this state, since the coolant does not need to go through the heat exchanger to cool down, the overall vehicle efficiency can be increased and energy consumption can be reduced to a certain extent.

[0053] When the ambient temperature is low, the battery is discharging at a high current, and the heat generation is high, the vehicle's compressor is activated for active cooling. If the ambient temperature is lower than the coolant temperature, the first flap 2 and the second flap 3 can be opened to allow low-temperature air to pass through the cold plates, reducing the average temperature of the cold plates and thus increasing the heat transfer from the battery to the cold plates. This reduces the overall cooling power of the refrigeration system, thereby improving the energy utilization efficiency of the entire vehicle.

[0054] Therefore, the bottom guard plate of this application embodiment can increase the adaptability of coolant self-circulation passive heat dissipation, thereby reducing compressor running time and reducing the energy consumption of the vehicle thermal management system; it can also improve the efficiency of the battery pack thermal management system, reduce compressor start time, and thus improve the thermal management efficiency of the vehicle.

[0055] In another aspect of this application, a vehicle is also provided, including the aforementioned battery pack.

[0056] The embodiments of this application have at least the following beneficial effects: The battery pack bottom guard plate, battery pack, and vehicle provided in this application embodiment include a plate body, a first flap, a second flap, and a drive mechanism. A flow guide groove is formed on one side of the plate body, and the two ends of the groove are set as a first groove and a second groove. The first flap and the second flap are rotatably disposed in the first groove and the second groove and are connected to the drive mechanism for transmission. Thus, they can be rotated under the drive of the drive mechanism to adjust the opening of the first groove and the second groove, introduce air jets with different flow rates, enhance the heat exchange of the cold plate in the battery pack, thereby improving the cooling efficiency and improving the cooling energy efficiency of the battery pack to a certain extent.

[0057] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0059] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. In this application, unless otherwise explicitly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction relationship between two components, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In addition, the descriptions involving "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of the aforementioned features. In the description of this application, "multiple" means two or more, unless otherwise explicitly and specifically limited.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0061] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0062] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack bottom protective plate, characterized in that, include: The plate body has a flow guide groove on one side of the plate body, and the two ends of the flow guide groove are respectively set as a first groove and a second groove. The first flap is rotatably disposed in the first slot to adjust the opening of the first slot; The second flap is rotatably disposed within the second slot to adjust the opening of the second slot; A drive mechanism is connected to the first flap and the second flap respectively to synchronously adjust the rotation amplitude of the first flap and the second flap.

2. The battery pack bottom protective plate as described in claim 1, characterized in that, The drive mechanism includes: A drive motor is mounted on the plate. The drive shaft is connected to the rotor shaft of the drive motor and the first flap. A transmission assembly is connected to the drive shaft and the second flap to synchronously drive the second flap to rotate during the rotation of the drive shaft.

3. The battery pack bottom protective plate as described in claim 2, characterized in that, The drive shaft is rotatably inserted through the plate, and the drive shaft is connected to the rotating shaft of the first flap.

4. The battery pack bottom protective plate as described in claim 3, characterized in that, The drive shaft is integrated with the first flap, and the drive shaft is configured as the rotating shaft of the first flap.

5. The battery pack bottom protective plate as described in any one of claims 1 to 4, characterized in that, The transmission assembly includes: The first swing arm is coaxially fixed to the drive shaft; A transmission link, the first end of which is hinged to the first swing arm; The second swing arm is coaxially fixed to the rotating shaft of the second flap, and the second swing arm is also hinged to the transmission link.

6. The battery pack bottom protective plate as described in claim 5, characterized in that, The middle part of the first swing arm is connected to the drive shaft, the middle part of the second swing arm is connected to the rotating shaft of the second flap, and there are two transmission links arranged in parallel. The first swing arm and the second swing arm are arranged in parallel.

7. The battery pack bottom protective plate as described in claim 5, characterized in that, The edges of the first flap and / or the second flap are provided with sealing elements.

8. The battery pack bottom protective plate as described in claim 5, characterized in that, The rotation center line of the first flap coincides with the symmetry center axis of the first flap; And / or, the rotation center line of the second flap coincides with the symmetry center axis of the second flap.

9. A battery pack, characterized in that, Includes the battery pack bottom protection plate as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, Includes the battery pack as described in claim 9.

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