Battery pack lower box body assembly, battery pack and vehicle

Abstract

The utility model relates to a power battery, in particular to a battery pack lower box body assembly, a battery pack and a vehicle, the battery pack lower box body assembly comprises a lower box body frame, a liquid cooling plate and a bottom protection plate, the liquid cooling plate is connected to a lower end opening of the lower box body frame in a covering mode, and the bottom protection plate is arranged below the liquid cooling plate. The bottom protection plate is connected with the lower box body frame and / or the liquid cooling plate; a first sealing piece is clamped between the peripheral edge of the upper side of the bottom protection plate and the liquid cooling plate, and at least one air hole is formed in a non-working area of the liquid cooling plate. The device is simple in structure, and can achieve the effective detection of the sealing performance between the bottom protection plate and the liquid cooling plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a power battery, concretely relates to a battery pack lower box assembly, battery pack and vehicle. BACKGROUND

[0002] With the rise of new energy technology, the number of electric vehicles is increasing, and the battery pack, as a very important part of the electric vehicle, provides sufficient electric energy for the electric vehicle. With the widespread application of large cells and fast charging, in order to achieve lightweight, the installation space of the battery pack in the electric vehicle is becoming smaller and smaller, and the overall height of the battery is also reduced, and the battery heat dissipation problem is becoming more and more prominent. In order to solve the heat dissipation problem, various integrated liquid cooling function batteries have appeared on the market at present, and the liquid cooling plate is often integrated in the lower shell of the battery.

[0003] Due to the introduction of the liquid cooling plate, the sealing performance of the battery pack box body is affected. In the related technology, the sealing between the bottom guard plate and the liquid cooling plate is increased, so that the electric vehicle is more effectively protected when the bottom is knocked and other invasions during driving, and the sealing performance is enhanced. In addition to this, the existing conventional bottom guard plate and liquid cooling plate sealing design is mainly full adhesive and sealing gasket full sealing scheme. Due to the space structure problem, the sealing performance between the bottom guard plate and the liquid cooling plate cannot be detected. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a battery pack lower box assembly, battery pack and vehicle, which has a simple structure and can effectively detect the sealing performance between the bottom guard plate and the liquid cooling plate.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] Firstly, the utility model provides a battery pack lower box assembly, which comprises a lower box frame, a liquid cooling plate and a bottom guard plate. The liquid cooling plate is connected to the lower end opening of the lower box frame. The bottom guard plate is arranged below the liquid cooling plate. The bottom guard plate is connected to the lower box frame and / or the liquid cooling plate. A first sealing element is arranged between the outer periphery of the upper side of the bottom guard plate and the liquid cooling plate. The non-working area of the liquid cooling plate is provided with at least one air hole.

[0007] Further, a second sealing element is arranged between the lower box frame and the liquid cooling plate. The second sealing element is arranged in a ring shape along the circumference of the lower side of the lower box frame, so as to seal and connect the lower box frame and the liquid cooling plate.

[0008] Further, the first sealing element is arranged in a ring shape along the circumference of the upper side of the bottom guard plate, so as to seal and connect the bottom guard plate and the liquid cooling plate. The air hole is located inside the ring-shaped first sealing element.

[0009] Further, the bottom guard plate is fixedly connected with the lower box frame by fasteners.

[0010] Further, the fastener comprises a bolt and a rivet nut, the rivet nut is arranged on the lower box frame, the bolt passes through the bottom guard plate and is threadedly connected with the rivet nut, and the lower end of the bolt is supported on the side of the bottom guard plate away from the liquid cooling plate.

[0011] Further, the upper end of the rivet nut is deformed to form an outward protrusion capable of abutting against the lower box frame, and the lower end of the rivet nut extends radially to form a limiting boss, and the liquid cooling plate is clamped between the lower box frame and the limiting boss.

[0012] Further, the thickness of the first sealing member is equal to the thickness of the limiting boss.

[0013] Further, the lower box frame further comprises a cross beam, and the two ends of the cross beam are correspondingly connected to the two opposite sides of the lower box frame.

[0014] In a second aspect, the utility model provides a battery pack, comprising a battery and the battery pack lower box assembly, the battery is installed in the battery pack lower box assembly.

[0015] In a third aspect, the utility model provides an automobile, comprising the battery pack.

[0016] The utility model has the following unexpected beneficial effects: the utility model sets at least one air hole in the non-working area of the liquid cooling plate, when assembling the battery pack lower box assembly, the sealing performance between the bottom guard plate and the liquid cooling plate can be detected through the air hole. After the sealing performance detection is qualified, the air hole is blocked, and the normal work of the battery pack is ensured. By such arrangement, the sealing performance between the bottom guard plate and the liquid cooling plate can be effectively detected, and the battery pack lower box assembly is slightly changed, the structure is simple, and the utility model is easy to popularize and apply. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model.

[0018] Figure 1 The structure of the battery pack lower box assembly is shown in the schematic view of the utility model;

[0019] Figure 2 The arrangement position of the air hole is shown in the schematic view of the utility model;

[0020] Figure 3 The utility model discloses a connecting section view of the lower box body assembly of battery pack shows.

[0021] In the figure, 1 is the lower box body frame, 2 is the liquid cooling plate, 3 is the bottom guard plate, 4 is the first sealing element, 5 is the second sealing element, 6 is the bolt element, 7 is the pull rivet nut, 71 is the deformation area, 72 is the limiting boss, 8 is the crossbeam, 9 is the air hole. DETAILED DESCRIPTION

[0022] The other advantages and effects of the utility model can be easily understood by the person skilled in the art from the content disclosed in the specification. The utility model can also be implemented or applied by another different specific implementation, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be understood that the preferred embodiment is only for illustrating the utility model, and is not for limiting the protection scope of the utility model.

[0023] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the utility model in a schematic manner, and the drawings only show the components related to the utility model without drawing the number, shape and size of the components in actual implementation. The type, number and proportion of each component in actual implementation can be randomly changed, and the component layout type can also be more complex.

[0024] In an embodiment, referring to the drawings shown in Figure 1 and Figure 2 The utility model provides a kind of lower box body assembly of battery pack, including lower box body frame 1, liquid cooling plate 2 and bottom guard plate 3, the liquid cooling plate 2 is connected to the lower end opening of the lower box body frame 1, the bottom guard plate 3 is placed below the liquid cooling plate 2, the bottom guard plate 3 is connected with the lower box body frame 1 and / or the liquid cooling plate 2;First sealing element 4 is clamped between the outer periphery of the upper side of the bottom guard plate 3 and the liquid cooling plate 2, and the non-working area of the liquid cooling plate 2 is provided with at least one air hole 9.

[0025] The liquid cooling plate 2 is designed to cover and connect at the lower end opening of the lower box body frame 1, which helps to effectively cool the battery pack through the liquid cooling plate 2 and ensures its stable operation.

[0026] The bottom guard plate 3 is placed below the liquid cooling plate 2 and plays a protective and supporting role. The bottom guard plate 3 can be connected with the lower box frame 1 and / or the liquid cooling plate 2 by various means (such as screws, buckles, etc.) to ensure the structural stability and reliability of the entire assembly. And between the upper side of the outer periphery of the bottom guard plate 3 and the liquid cooling plate 2, a first sealing element 4 is specially designed. The role of the first sealing element 4 is to prevent external impurities such as water and dust from entering the inside of the battery pack, thereby protecting the internal components of the battery pack from damage.

[0027] In addition, the non-working area of the liquid cooling plate 2 (i.e. the area not directly involved in the cooling work) is provided with at least one air hole 9, which can realize the sealing performance detection between the bottom guard plate 3 and the liquid cooling plate 2 when assembling the battery pack lower box assembly. After the sealing performance detection is qualified, the air hole 9 is blocked to ensure the normal work of the battery pack. In this way, the effective detection of the sealing performance between the bottom guard plate 3 and the liquid cooling plate 2 is ensured, and the modification of the battery pack lower box assembly is small, the structure is simple, and it is beneficial to popularization and application.

[0028] In a preferred embodiment, as shown in Figure 1 and Figure 3 The second sealing element 5 is arranged between the lower box frame 1 and the liquid cooling plate 2, and the second sealing element 5 is arranged in a ring shape along the circumference of the lower side of the lower box frame 1 to seal the connection between the lower box frame 1 and the liquid cooling plate 2.

[0029] The ring-shaped arrangement ensures that the second sealing element 5 can fully and uniformly cover the joint surface between the lower box frame 1 and the liquid cooling plate 2, thereby effectively preventing external impurities such as water and dust from entering the inside of the battery pack through the gap. Through the addition of the second sealing element 5, the connection between the lower box frame 1 and the liquid cooling plate 2 becomes more tight and reliable, which improves the protection level of the battery pack as a whole, and further prolongs the service life of the battery pack, because the risk of damage to internal components caused by the invasion of external impurities is reduced.

[0030] In a preferred embodiment, the first sealing element 4 is arranged in a ring shape along the circumference of the upper side of the bottom guard plate 3 to seal the connection between the bottom guard plate 3 and the liquid cooling plate 2, and the air hole 9 is located inside the ring-shaped first sealing element 4.

[0031] The annular arrangement ensures that the first seal 4 can fully and tightly adhere to the joint surface between the bottom guard plate 3 and the liquid cooling plate 2, thereby effectively preventing external impurities (such as moisture, dust, etc.) from entering the battery pack interior through this gap. In particular, it is worth mentioning that the air vent hole 9 is ingeniously arranged on the inner side of the annular first seal 4, ensuring that the air vent hole can work normally, effectively detecting the sealing between the bottom guard plate 3 and the liquid cooling plate 2, and avoiding the risk of external impurities directly invading the battery pack interior through the air vent hole. Because the annular design of the first seal 4 forms an effective barrier, the air vent hole 9 is isolated from the external environment.

[0032] In a preferred embodiment, the bottom guard plate 3 is fixedly connected to the lower box frame 1 by fasteners.

[0033] As a commonly used connecting element, fasteners have the advantages of simple structure, reliable connection, easy disassembly, etc. In the battery pack lower box assembly, the bottom guard plate 3 is fixedly connected to the lower box frame 1 by fasteners, which can ensure the stability and reliability of the connection between the two. This connection method not only can withstand various forces and vibrations generated during the operation of the battery pack, but also can effectively prevent the bottom guard plate 3 from being loose or falling off and causing damage to the internal components of the battery pack.

[0034] In addition, the use of fasteners for connection also facilitates subsequent maintenance and replacement work. When the bottom guard plate 3 needs to be replaced due to long-term use or accidental damage, it can be easily replaced by simply removing the corresponding fasteners without disassembling the entire battery pack lower box assembly.

[0035] Further, referring to Figure 3 As shown, the fastener includes a bolt 6 and a rivet nut 7, the rivet nut 7 is arranged on the lower box frame 1, the bolt 6 passes through the bottom guard plate 3 and is threadedly connected with the rivet nut 7, and the lower end of the bolt 6 is supported on the side of the bottom guard plate 3 away from the liquid cooling plate 2.

[0036] Specifically, the rivet nut 7 is pre-installed on the lower box frame 1 at a predetermined position. The design of the rivet nut 7 allows it to be firmly fixed on the lower box frame 1 by riveting or pressing, thereby providing a reliable threaded connection point.

[0037] When the bottom guard plate 3 needs to be installed on the lower box frame 1, the bolt 6 is passed through the reserved hole on the bottom guard plate 3 and extends upward until it meets the rivet nut 7. Then, the bolt 6 is threadedly connected with the rivet nut 7, and by rotating the bolt 6, it is gradually tightened until the lower end of the bolt 6 is tightly supported on the side of the bottom guard plate 3 away from the liquid cooling plate 2. This tight support ensures that the connection between the bottom guard plate 3 and the lower box frame 1 is stable and firm.

[0038] The threaded connection between the bolt member 6 and the pull nut 7 provides a strong connection force that can resist various forces and vibrations generated during the operation of the battery pack, ensuring that the connection between the bottom guard plate 3 and the lower box frame 1 does not loosen or fall off. The connection method of the bolt member 6 and the pull nut 7 makes the installation and removal of the bottom guard plate 3 relatively simple and fast, without the need for complex tools or steps. The pull nut 7 can be flexibly installed at any position of the lower box frame 1 to adapt to different connection needs and design requirements, providing more possibilities for customized design of the battery pack lower box assembly.

[0039] Further, the upper end deformation area 71 of the pull nut 7 is arranged through the liquid cooling plate 2 and the lower box frame 1, and is formed outwardly convex to abut against the lower box frame 1. The lower end of the pull nut 7 extends radially to form a limiting boss 72, and the liquid cooling plate 2 is clamped between the lower box frame 1 and the limiting boss 72. In this way, the bolt member 6 and the pull nut 7 are used to quickly connect the lower box frame 1, the liquid cooling plate 2 and the bottom guard plate 3, reducing the number of fasteners used, reducing assembly difficulty, improving assembly efficiency, and achieving the purpose of reducing cost and increasing efficiency.

[0040] Further, the thickness of the first sealing member 4 is equal to the thickness of the limiting boss 72, which ensures that the bottom guard plate 3 can form a uniform and tight contact surface with the liquid cooling plate 2 and the lower box frame 1. When the first sealing member 4 is correctly installed and pressed between the bottom guard plate 3 and the liquid cooling plate 2, the consistency of its thickness with the limiting boss 72 makes the entire contact surface remain flat in the vertical direction, effectively preventing leakage problems caused by gaps or unevenness.

[0041] In addition, the design of the first sealing member 4 with the same thickness as the limiting boss 72 also helps to improve the stability of the entire connection structure. Due to the consistency in thickness, they can jointly withstand various forces and vibrations generated during the operation of the battery pack, thereby enhancing the durability and reliability of the entire battery pack lower box assembly.

[0042] This fine design consideration not only reflects the high attention to the sealing and stability of the battery pack, but also provides more convenience for subsequent maintenance and replacement work. Because when the first sealing member 4 needs to be replaced, it can be more easily ensured that it forms a good fit with the newly installed limiting boss 72, thereby simplifying the maintenance process and improving work efficiency.

[0043] In a preferred embodiment, the lower box frame 1 further comprises a cross beam 8, and the two ends of the cross beam 8 correspondingly connect two opposite sides of the lower box frame 1.

[0044] The cross beam 8 is designed to connect the structural members of the two opposite sides of the lower box frame 1, and the two ends thereof are connected with the two side walls of the lower box frame 1 respectively. This connection mode not only strengthens the load-carrying capacity of the lower box frame 1 in the horizontal direction, but also helps to disperse and resist various forces and vibrations that may be generated during the operation of the battery pack. In addition, the addition of the cross beam 8 also makes the overall structure of the lower box frame 1 more balanced and stable. Inside the battery pack, the interaction and force transmission between various components often lead to structural imbalance, and the cross beam 8 can effectively balance these forces to ensure the overall stability and reliability of the lower box assembly of the battery pack.

[0045] It is worth mentioning that the design of the cross beam 8 can also be customized according to actual needs. For example, according to the size, weight and operating environment of the battery pack, the appropriate size, material and connection mode of the cross beam 8 can be selected to achieve the best load-carrying effect and stability.

[0046] Exemplarily, the first seal 4 and the second seal 5 are both sealing structural glue. Specifically, during assembly, the sealing structural glue is first coated circumferentially on the bottom of the lower box frame 1 as the second seal 5, and then the liquid cooling plate 2 is pre-connected with the lower box frame 1 through the rivet nut 7.

[0047] After the installation of the liquid cooling plate 2 is completed, the gas permeation hole 9 is sealed, and the air tightness between the liquid cooling plate 2 and the lower box frame 1 is detected by using an air tightness tool.

[0048] After the air tightness between the liquid cooling plate 2 and the lower box frame 1 is detected to be qualified, the bottom guard plate 3 is installed, the sealing structural glue is coated on the upper side of the bottom guard plate 3 to form the first seal 4, the bolt 6 is used to threadedly cooperate with the rivet nut 7 through the bottom guard plate 3, so that the deformation area 71 of the rivet nut 7 protrudes outward to form an outer convex which can abut against the lower box frame 1, and the fixed connection of the bottom guard plate 3, the liquid cooling plate 2 and the lower box frame 1 is realized.

[0049] After the installation of the bottom guard plate 3 is completed, the gas permeation hole 9 is opened, and the air tightness between the bottom guard plate 3 and the liquid cooling plate 2 is detected by using an air tightness tool.

[0050] After the air tightness between the bottom guard plate 3 and the liquid cooling plate 2 is detected to be qualified, the gas permeation hole 9 is sealed, and the air tightness of the lower box assembly of the battery pack is detected again by using an air tightness tool. After being qualified, the assembly and fixation of the lower box assembly of the battery pack are completed.

[0051] In an embodiment, the utility model provides a battery pack, which comprises a battery and the lower box assembly of the battery pack provided by any of the above embodiments, and the battery is installed in the lower box assembly of the battery pack.

[0052] In an embodiment, the utility model provides an automobile, which comprises the above battery pack.

[0053] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or transformations made by those skilled in the art based on the present application are within the protection scope of the present application.

Claims

1. A battery pack lower case assembly, characterized by: The lower cabinet frame (1), the liquid cooling plate (2) and the bottom guard plate (3) are included, the liquid cooling plate (2) is connected to the lower end opening of the lower cabinet frame (1), and the bottom guard plate (3) is arranged below the liquid cooling plate (2), and the bottom guard plate (3) is connected with the lower cabinet frame (1) and / or the liquid cooling plate (2). The first sealing element (4) is arranged between the upper side outer periphery of the bottom guard plate (3) and the liquid cooling plate (2), and the non-working area of the liquid cooling plate (2) is provided with at least one air hole (9).

2. The battery pack lower box assembly of claim 1, wherein: The second sealing element (5) is arranged between the lower cabinet frame (1) and the liquid cooling plate (2), and the second sealing element (5) is arranged in a ring shape along the circumference of the lower side of the lower cabinet frame (1) to seal the connection between the lower cabinet frame (1) and the liquid cooling plate (2).

3. The battery pack lower box assembly of claim 1, wherein: The first sealing element (4) is arranged in a ring shape along the circumference of the upper side of the bottom guard plate (3) to seal the connection between the bottom guard plate (3) and the liquid cooling plate (2), and the air hole (9) is located inside the ring-shaped first sealing element (4).

4. The battery pack lower box assembly of claim 1, wherein: The bottom guard plate (3) is fixedly connected with the lower cabinet frame (1) through the fastener.

5. The battery pack lower box assembly of claim 4, wherein: The fastener includes a bolt (6) and a rivet nut (7), the rivet nut (7) is arranged on the lower cabinet frame (1), the bolt (6) passes through the bottom guard plate (3) and is threadedly connected with the rivet nut (7), and the lower end of the bolt (6) is supported on the side of the bottom guard plate (3) away from the liquid cooling plate (2).

6. The battery pack lower box assembly of claim 5, wherein: The upper end deformation area (71) of the rivet nut (7) is arranged in the liquid cooling plate (2) and the lower cabinet frame (1), and is outwardly convex to form an outer convex portion capable of abutting against the lower cabinet frame (1) in the circumferential direction, and the lower end of the rivet nut (7) extends radially to form a limiting boss (72), and the liquid cooling plate (2) is arranged between the lower cabinet frame (1) and the limiting boss (72).

7. The battery pack lower box assembly of claim 6, wherein: The thickness of the first sealing element (4) is equal to the thickness of the limiting boss (72).

8. The battery pack lower box assembly of claim 1, wherein: The lower cabinet frame (1) further comprises a cross beam (8), and the two ends of the cross beam (8) are correspondingly connected to the two opposite sides of the lower cabinet frame (1).

9. A battery pack, characterized by: The battery and the battery pack lower cabinet assembly of any one of claims 1-8 are included, and the battery is installed in the battery pack lower cabinet assembly.

10. A vehicle characterized by: The battery pack of claim 9 is included.

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