Battery pack and electric device

Abstract

This application relates to a battery pack and an electrical device, belonging to the field of battery technology. It includes a housing, a battery pack, a first beam, and an air-cooling assembly. The housing includes multiple side panels. The battery pack is disposed within the housing, and a first air duct exists between the battery pack and the side panels. The first beam is connected to the housing, dividing the housing into a first cavity and a second cavity, with the battery pack located within the first cavity. The first beam has a first opening, which is opposite to the first air duct and communicates with both the first air duct and the second cavity. The air-cooling assembly is located within the second cavity, with its air inlet spaced apart from the first beam. This application embodiment utilizes the air-cooling assembly for heat dissipation, resulting in good heat dissipation. The heat generated by the battery pack passes sequentially through the first air duct, the first opening of the first beam, and then is discharged from the battery pack through the air-cooling assembly, effectively reducing the temperature of the battery pack inside the battery pack, ensuring a safe working environment, and improving the safety and reliability of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] When the battery pack is charging and discharging, the cells will continuously generate heat, which will cause the temperature inside the entire battery pack to rise and the temperature difference between the cells to increase, posing a risk of thermal runaway. Utility Model Content

[0003] This application provides a battery pack and an electrical device to at least partially solve the technical problem of high internal temperature in the battery pack, which poses a risk of thermal runaway.

[0004] To achieve the above objectives, according to a first aspect of this application, this application provides a battery pack, comprising:

[0005] The enclosure includes multiple side panels;

[0006] The battery pack is housed inside the casing, and there is a first air duct between the battery pack and the side panel;

[0007] The first beam is connected to the housing and divides the housing into a first cavity and a second cavity. The battery pack is located in the first cavity. The first beam has a first opening, which is opposite to the first air duct and communicates with the first air duct and the second cavity, respectively.

[0008] The air-cooled component is located in the second cavity, and the air inlet of the air-cooled component is spaced apart from the first beam.

[0009] In some embodiments, the battery pack includes a plurality of battery packs, which are spaced apart along a first direction and have a second air duct between adjacent battery packs.

[0010] The first beam has a plurality of first openings spaced apart along a first direction, and the first openings are positioned opposite to one of the first air duct and the second air duct.

[0011] In some embodiments, the battery pack includes a second beam disposed between two adjacent battery packs, the second beam being connected to a first beam, and the second beam having a second air duct communicating with a first opening.

[0012] In some embodiments, the battery pack includes a plurality of individual cells arranged along a second direction, which intersects with the first direction;

[0013] The battery pack includes multiple air guide plates, multiple individual batteries and multiple air guide plates are arranged alternately along a second direction, and the air guide plates and individual batteries are connected to one side along the second direction.

[0014] In some embodiments, the second beam has a second opening, and the air guide plate has a third air duct, which communicates with the second opening.

[0015] In some embodiments, the air guide plate includes an air guide plate body and at least one partition layer. The air guide plate body has a third air duct, and the partition layer is disposed in the third air duct and divides the third air duct into multiple sub-air ducts.

[0016] In some embodiments, the air guide plate further includes an insulating layer located on the outer periphery of the air guide plate body.

[0017] In some embodiments, the enclosure includes a base plate;

[0018] The battery pack includes a liquid cooling assembly, which is located between the base plate and the battery pack.

[0019] In some embodiments, the battery pack includes a temperature detection device and a controller. The temperature detection device is connected to the battery pack and electrically connected to the controller. The controller is electrically connected to both the liquid cooling component and the air cooling component.

[0020] According to a second aspect of this application, this application provides an electrical device including the aforementioned battery pack.

[0021] This application provides a battery pack, including a housing, a battery pack, a first beam, and an air-cooling assembly. The housing includes multiple side panels. The battery pack is disposed within the housing, and a first air duct is provided between the battery pack and the side panels. The first beam is connected to the housing and divides the housing into a first cavity and a second cavity, with the battery pack located within the first cavity. The first beam has a first opening, which is opposite to the first air duct and communicates with both the first air duct and the second cavity. The air-cooling assembly is located within the second cavity, with its air inlet spaced apart from the first beam. This application embodiment utilizes the air-cooling assembly for heat dissipation, resulting in good heat dissipation. The heat generated by the battery pack passes sequentially through the first air duct, the first opening of the first beam, and then is discharged from the battery pack through the air-cooling assembly, effectively reducing the temperature of the battery pack inside the battery pack, ensuring a safe working environment, and improving the overall safety and reliability of the battery pack.

[0022] The electrical device in this application includes the battery pack described above. Therefore, the electrical device can have all the technical features and beneficial effects of the battery pack described above, which will not be repeated here.

[0023] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0024] 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 drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0026] Figure 1 This is a schematic diagram of the structure of the battery pack provided in an exemplary embodiment of this application;

[0027] Figure 2 This is a partial structural diagram of the battery pack provided in an exemplary embodiment of this application;

[0028] Figure 3 This is a top view of the battery pack provided in an exemplary embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the battery pack provided in an exemplary embodiment of this application;

[0030] Figure 5 This is a top view of the battery pack provided in an exemplary embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the structure of the first beam provided in an exemplary embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the structure of the air guide plate provided in an exemplary embodiment of this application;

[0033] Figure 8 This is a side view of the air guide plate provided in an exemplary embodiment of this application;

[0034] Figure 9 This is a cross-sectional view of the liquid cooling assembly provided in an exemplary embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Housing; 2. Battery pack; 3. First air duct; 4. First beam; 5. Second beam; 6. Air-cooled assembly; 7. Air guide plate; 8. Liquid-cooled assembly; 9. Temperature detection device; 10. Controller; 11. Side plate; 12. Bottom plate; 13. First cavity; 14. Second cavity; 20. Single battery cell; 40. First opening; 50. Second air duct; 51. Second opening; 70. Third air duct; 71. Air guide plate body; 72. Separator layer; 73. Sub-air duct; 74. Insulation layer; 80. Liquid-cooled plate; 81. Flow channel; 82. Liquid inlet; 83. Liquid outlet; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0037] 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 them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0038] The applicant noted that during the charging and discharging operation of the battery pack, the cells continuously generate heat, leading to an increase in the overall temperature of the battery pack and a greater temperature difference between the cells, posing a risk of thermal runaway. Traditional liquid-cooled battery packs can only dissipate heat through liquid cooling plates at the bottom of the cells. When the cell operating temperature reaches a set value, the cooling system is activated, and the liquid cooling unit starts to drive the coolant to dissipate heat from the liquid-cooled pack. Frequent activation increases power consumption, loses energy, and affects efficiency.

[0039] Liquid-cooled battery packs rely solely on coolant for heat dissipation. The entire liquid cooling system requires a circulation pump and an external cold source, and its power consumption accounts for 3%-8% of the total battery pack energy consumption. During peak electricity consumption periods, the power consumption of the liquid cooling system becomes extremely high. This significantly reduces the overall efficiency of the energy storage system. Relying on coolant for heat dissipation over extended periods puts pressure on the flow channel plates. Since energy storage systems typically have a 10-year warranty, relying solely on coolant reduces the battery pack's lifespan. In low-temperature environments, the coolant viscosity increases, leading to decreased flowability, increased pressure on the external pump, a sharp rise in energy consumption, poorer heat dissipation within the battery pack, and larger temperature differences between the cells.

[0040] In view of this, this application provides a battery pack and an electrical device. The battery pack includes a housing, a battery pack, a first beam, and an air-cooling assembly. The housing includes multiple side panels. The battery pack is disposed within the housing, and a first air duct is provided between the battery pack and the side panels. The first beam is connected to the housing and divides the housing into a first cavity and a second cavity, with the battery pack located within the first cavity. The first beam has a first opening, which is opposite to the first air duct and communicates with both the first air duct and the second cavity. The air-cooling assembly is located within the second cavity, with its air inlet spaced apart from the first beam. This application uses an air-cooling assembly for heat dissipation, resulting in good heat dissipation. The heat generated by the battery pack passes sequentially through the first air duct, the first opening of the first beam, and then is discharged from the battery pack through the air-cooling assembly, thereby effectively reducing the temperature of the battery pack inside the battery pack, ensuring a safe working environment for the battery pack, and improving the overall safety and reliability of the battery pack.

[0041] The battery pack and power supply device of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0042] Figure 1 This is a schematic diagram of the structure of the battery pack provided in an exemplary embodiment of this application; Figure 2 This is a partial structural diagram of the battery pack provided in an exemplary embodiment of this application; Figure 3 This is a top view of the battery pack provided in an exemplary embodiment of this application; Figure 4 This is a schematic diagram of the structure of the battery pack 2 provided in an exemplary embodiment of this application; Figure 5 This is a top view of the battery pack 2 provided in an exemplary embodiment of this application;

[0043] Figure 6 This is a schematic diagram of the structure of the first beam 4 provided in an exemplary embodiment of this application; Figure 7 This is a schematic diagram of the structure of the air guide plate 7 provided in an exemplary embodiment of this application; Figure 8 This is a side view of the air guide plate 7 provided in an exemplary embodiment of this application; Figure 9 This is a cross-sectional view of the liquid cooling component 8 provided in an exemplary embodiment of this application.

[0044] Reference Figure 1 and Figure 2The battery pack includes a housing 1, a battery pack 2, a first beam 4, and an air-cooling assembly 6. The housing 1 includes multiple side panels 11. The battery pack 2 is disposed within the housing 1, and a first air duct 3 is provided between the battery pack 2 and the side panels 11 to dissipate the heat generated by the battery pack 2. The first beam 4 is connected to the housing 1 and divides the housing 1 into a first cavity 13 and a second cavity 14, with the battery pack 2 located within the first cavity 13. The first beam 4 has a first opening 40, which is opposite to the first air duct 3 and communicates with both the first air duct 3 and the second cavity 14. The air-cooling assembly 6 is located within the second cavity 14, and its air inlet is spaced apart from the first beam 4. For example, the air-cooling assembly 6 is an axial fan, installed on the opening of the housing 1. Maintaining a certain distance between the air inlet of the air-cooling assembly 6 and the first beam 4 prevents airflow blockage. The axial fan features self-closing louvers that automatically close when the fan stops, preventing dust or rainwater from flowing back in and ensuring the battery pack's sealing performance. In this embodiment, heat dissipation is achieved through the air-cooling component 6, which provides excellent cooling. The heat generated by the battery pack 2 is sequentially discharged through the first air duct 3 and the first opening 40 of the first beam 4 into the second cavity 14, and then expelled from the battery pack through the air-cooling component 6 within the second cavity 14. This effectively reduces the temperature of the battery pack 2 inside the battery pack, ensuring a safe operating environment and improving the overall safety and reliability of the battery pack. Furthermore, the battery pack typically includes a liquid cooling component 8. The air-cooling component 6 works in conjunction with the liquid cooling component 8 to regulate the temperature of the battery pack 2, reducing the start-up frequency of the liquid cooling component 8, lowering power consumption, and making it suitable for low-load conditions, thus improving the overall energy efficiency of the battery pack. Simultaneously, the airflow reduces the risk of condensation on the liquid cooling component 8, improving the insulation safety of the battery pack.

[0045] In some embodiments, refer to Figure 3 The battery pack includes multiple battery packs 2, which are spaced apart along a first direction X. A second air duct 50 is provided between adjacent battery packs 2 for dissipating heat between them. (Refer to...) Figure 6 The first beam 4 has multiple first openings 40 spaced apart along the first direction X. The first openings 40 are opposite to one of the first air duct 3 and the second air duct 50. The heat generated by the battery pack 2 is discharged into the second cavity 14 through the first air duct 3, the second air duct 50 and the first openings 40 of the first beam 4 in sequence, and is discharged from the battery pack through the air-cooling component 6 in the second cavity 14, thereby effectively reducing the temperature of the battery pack 2 inside the battery pack and avoiding excessive temperature difference between different battery packs 2.

[0046] In some embodiments, refer to Figure 2The battery pack includes a second beam 5, which is disposed between two adjacent battery packs 2 and connected to a first beam 4. The second beam 5 has a second air duct 50, which communicates with a first opening 40. The second beam 5 is hollow inside, forming the second air duct 50. One end of the second air duct 50 communicates with the first opening 40 of the first beam 4, and the other end extends to the gap between the adjacent battery packs 2. This allows heat generated by the battery packs 2 to be guided through the second air duct 50 within the second beam 5 and discharged through the first opening 40 of the first beam 4 to the second cavity 14. The heat can then be discharged from the battery pack through the air-cooling component 6 within the second cavity 14, preventing airflow dispersion and improving heat dissipation efficiency. Furthermore, the second beam 5 enhances the stability of the battery packs 2.

[0047] In some embodiments, refer to Figure 4 The battery pack 2 includes a plurality of individual cells 20 arranged along a second direction Y, which intersects with the first direction X; refer to Figure 7 The battery pack includes multiple air guide plates 7, and multiple individual batteries 20 are alternately arranged with the air guide plates 7 along a second direction Y. The air guide plates 7 are connected to one side of the individual batteries 20 along the second direction Y. Exemplarily, the air guide plate 7 can be fitted to the large surface of a single individual battery 20. Alternatively, the air guide plate 7 can be positioned between two adjacent individual batteries 20, thus fitting to the large surfaces of both individual batteries 20. Or, multiple individual batteries 20 can be positioned between two adjacent air guide plates 7; this application does not impose any limitations on this. It is understood that the air guide plate 7 can directly absorb heat from the surface of the individual battery 20 and conduct the heat to the second beam 5 through its own structure, expanding the heat dissipation contact area. The air guide plate 7 can accelerate heat diffusion and improve heat dissipation efficiency.

[0048] In some embodiments, refer to Figure 2 The second beam 5 has a second opening 51, which is located on the side of the second beam 5 facing the air guide plate 7. The air guide plate 7 has a third air duct 70, which communicates with the second opening 51. (Refer to...) Figure 3 The arrow indicates the direction of heat dissipation. One end of the third air duct 70 is connected to the second air duct 50 of the second beam 5 through the second opening 51, so that the heat generated by the single battery 20 can be discharged from the battery pack in sequence through the air guide plate 7, the second beam 5, the first beam 4 and the air-cooling component 6. The other end of the third air duct 70 can be connected to the first air duct 3 between the battery pack 2 and the side plate 11, so that the heat generated by the single battery 20 can be discharged from the battery pack in sequence through the air guide plate 7, the first beam 4 and the air-cooling component 6.

[0049] In some embodiments, the air guide plate 7 includes an air guide plate body 71 and at least one partition layer 72. The air guide plate body 71 has a third air duct 70, and the partition layer 72 is disposed within the third air duct 70 and divides the third air duct 70 into a plurality of sub-air ducts 73. For example, refer to... Figure 8 Multiple partition layers 72 are spaced apart along the third direction Z within the air guide plate body 71 to divide the third air duct 70 into multiple parallel sub-air ducts 73. This arrangement allows the airflow to be evenly distributed within the air guide plate 7, ensuring that the heat of the large surface of the individual battery 20 can be evenly removed, further reducing the temperature difference between the individual batteries 20.

[0050] In some embodiments, the air guide plate 7 further includes an insulating layer 74 located on the outer periphery of the air guide plate body 71. The air guide plate body 71 and the separator layer 72 can be made of extruded aluminum profile. The insulating layer 74 can be made by spraying insulating powder onto the surface of the air guide plate body 71 to ensure insulation safety. The high thermal conductivity of the aluminum profile air guide plate 7 can accelerate heat dissipation. Combined with the design of the insulating layer 74, it can improve heat dissipation efficiency and avoid the risk of short circuit between individual batteries 20, which complies with the safety specifications of the battery pack.

[0051] In some embodiments, the housing 1 includes a base plate 12; the battery pack includes a liquid cooling assembly 8, which is disposed between the base plate 12 and the battery pack 2. The liquid cooling assembly 8 includes a liquid cooling plate 80, which is integrated with the base plate 12. The liquid cooling plate 80 has a flow channel 81 inside, and an inlet 82 and an outlet 83 are respectively provided at both ends of the flow channel 81. (Refer to...) Figure 9 The arrow indicates the flow direction of the coolant in the flow channel 81. The coolant circulates in the flow channel 81 of the liquid cooling plate 80, which can quickly absorb the heat at the bottom of the battery pack 2.

[0052] In some embodiments, the battery pack includes a temperature detection device 9 and a controller 10. The temperature detection device 9 is connected to the battery pack 2 and electrically connected to the controller 10. The controller 10 is electrically connected to the liquid cooling assembly 8 and the air cooling assembly 6, respectively. Exemplarily, the temperature detection device 9 may be an NTC (Negative Temperature Coefficient) temperature sensor, see reference... Figure 5 The temperature detection device 9 is fixed to the terminal of the individual cell 20 in the battery pack 2 using thermally conductive adhesive, and is used to detect the temperature of the individual cell 20 in real time. (Refer to...) Figure 3 The controller 10 can be a BUS (bus) acquisition board. The controller 10 is electrically connected to the temperature detection device 9 through wires, and is also electrically connected to the liquid cooling component 8 and the air cooling component 6 respectively, for receiving temperature signals and controlling the opening and closing of the liquid cooling component 8 and the air cooling component 6.

[0053] In some embodiments, when the temperature detection device 9 detects that the temperature of a single battery cell 20 is low, for example, when the temperature of a single battery cell 20 is less than 35°C, the controller 10 only activates the air-cooling component 6 to dissipate heat through air cooling. When the temperature detection device 9 detects that the temperature of a single battery cell 20 is high, for example, when the temperature of a single battery cell 20 is greater than 35°C, the controller 10 activates the liquid-cooling component 8 to dissipate heat. The coolant circulates within the flow channel 81 of the liquid cooling plate 80, quickly absorbing heat from the bottom of the battery pack 2. At the same time, the air-cooling component 6 continues to operate, removing heat from the surface of the battery pack 2. The synergistic effect of both can significantly improve heat dissipation efficiency, reduce the temperature difference between the single batteries 20, avoid the risk of thermal runaway, and improve the safety and lifespan of the battery pack. In addition, compared with the traditional single liquid cooling mode, integrating the air-cooling component 6 and the liquid-cooling component 8 into the battery pack can reduce the operating time of the liquid-cooling component 8, reduce the power consumption of the liquid-cooling component 8, and extend the lifespan of the liquid cooling unit. According to a second aspect of this application, this application provides an electrical device including the aforementioned battery pack. Therefore, the electrical device can possess all the technical features and beneficial effects of the aforementioned battery pack, which will not be repeated here. The electrical devices in the embodiments of this application include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0054] Taking a vehicle as an example, one embodiment of this application provides an electrical device. A battery pack is installed inside the vehicle, and the battery pack can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller 10 and a motor. The controller 10 controls the battery pack to supply power to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving. The battery pack can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle.

[0055] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0056] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0057] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0058] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery pack, characterized by, include: The enclosure includes multiple side panels; A battery pack is disposed inside the housing, and a first air duct is provided between the battery pack and the side panel; A first beam is connected to the housing, and the first beam divides the housing into a first cavity and a second cavity, with the battery pack located in the first cavity; the first beam has a first opening, which is disposed opposite to the first air duct and communicates with the first air duct and the second cavity respectively. An air-cooled component is located in the second cavity, and the air inlet of the air-cooled component is spaced apart from the first beam.

2. The battery pack of claim 1, wherein, The battery pack includes multiple battery groups, which are spaced apart along a first direction, and a second air duct is provided between two adjacent battery groups. The first beam has a plurality of first openings spaced apart along the first direction, and the first openings are disposed opposite to one of the first air duct and the second air duct.

3. The battery pack of claim 2, wherein, The battery pack includes a second beam disposed between two adjacent battery packs. The second beam is connected to the first beam and has a second air duct that communicates with the first opening.

4. The battery pack according to claim 3, characterized in that, The battery pack includes a plurality of individual cells arranged along a second direction, which intersects with the first direction; The battery pack includes multiple air guide plates, and multiple individual batteries and multiple air guide plates are arranged alternately along the second direction. The air guide plates are connected to one side of the individual batteries along the second direction.

5. The battery pack according to claim 4, characterized in that, The second beam has a second opening, and the air guide plate has a third air duct, which is connected to the second opening.

6. The battery pack according to claim 5, characterized in that, The air guide plate includes an air guide plate body and at least one partition layer. The air guide plate body has the third air duct, and the partition layer is disposed in the third air duct and divides the third air duct into multiple sub-air ducts.

7. The battery pack according to claim 6, characterized in that, The air guide plate also includes an insulating layer, which is located on the outer periphery of the air guide plate body.

8. The battery pack according to claim 1, characterized in that, The enclosure includes a bottom plate; The battery pack includes a liquid cooling assembly disposed between the base plate and the battery pack.

9. The battery pack according to claim 8, characterized in that, The battery pack includes a temperature detection device and a controller. The temperature detection device is connected to the battery pack and electrically connected to the controller. The controller is electrically connected to both the liquid cooling component and the air cooling component.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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