Battery pack lower shell, battery pack and electric vehicle

Abstract

The embodiment of the utility model provides a battery pack lower shell, a battery pack and an electric vehicle, and relates to the technical field of battery packs. The battery pack lower shell comprises a lower shell body and reinforcing ribs, the lower shell body is provided with a hollow cavity, and the reinforcing ribs are arranged in the hollow cavity. The lower shell body is designed to be hollow, so that the weight of the lower shell can be reduced, used materials can be reduced, and the cost is reduced. By arranging the reinforcing ribs, the structural strength of the hollow lower shell can be improved, and the impact resistance of the lower shell can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and more specifically, to a lower casing of a battery pack, a battery pack, and an electric vehicle. Background Technology

[0002] In the power battery industry, the safety performance of battery packs for new energy vehicles is particularly important, with structural safety performance being the foundation of all other performance aspects. The casing not only needs to meet the structural strength and rigidity requirements of the battery pack itself, but it is also a major component of the vehicle's rigid frame. The bottom of the battery pack, in particular, requires not only rigidity but also a certain level of impact resistance.

[0003] However, most current battery pack lower casings are typically designed with increased wall thickness to improve structural strength and impact resistance. This results in an increase in the overall weight and cost of the battery pack. Utility Model Content

[0004] This utility model provides a lower housing of a battery pack, a battery pack, and an electric vehicle, which can improve the structural strength and impact resistance of the lower housing of the battery pack while reducing weight and cost.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] An embodiment of this utility model provides a lower housing for a battery pack, which includes:

[0007] The lower housing body has a hollow cavity;

[0008] A reinforcing rib is provided in the hollow cavity.

[0009] In an optional embodiment, the reinforcing rib is in the shape of an "I" character.

[0010] In an optional embodiment, the reinforcing rib includes a first abutting portion, a supporting portion, and a second abutting portion. One end of the supporting portion is perpendicularly connected to the first abutting portion, and the other end of the supporting portion is perpendicularly connected to the second abutting portion. The first abutting portion and the second abutting portion are respectively used to abut against the two inner surfaces of the lower shell body that form the hollow cavity.

[0011] Along the direction from the central axis away from the support portion to the central axis closer to the support portion, the thickness of the first abutment portion gradually increases;

[0012] And / or, along the direction from the central axis of the support portion away from the central axis of the support portion to the direction from the central axis of the support portion, the thickness of the second abutment portion gradually increases.

[0013] In an optional embodiment, the support portion extends along the length direction of the lower housing body; the lengths of the first abutment portion, the support portion, and the second abutment portion are all the same as the length of the lower housing body.

[0014] In an optional embodiment, there are multiple reinforcing ribs, which are arranged parallel to each other and spaced apart along the width direction of the lower housing body.

[0015] In an optional embodiment, the lower housing of the battery pack further includes a plurality of support beams, with at least one support beam disposed between two adjacent reinforcing ribs.

[0016] In an optional embodiment, the plurality of support beams are arranged parallel to and spaced apart along the width direction of the lower housing body.

[0017] In an optional embodiment, the length of each of the support beams is the same as the length of the lower housing body.

[0018] In an optional embodiment, the lower housing of the battery pack further includes a first positioning track and a second positioning track, which are parallel and spaced apart on the lower housing body. The first positioning track and the second positioning track are used together to clamp and limit the battery cells.

[0019] An embodiment of this utility model also provides a battery pack, including a plurality of battery cells and a lower housing of the battery pack as described in any of the above embodiments, wherein the plurality of battery cells are all placed in the lower housing of the battery pack.

[0020] An embodiment of this utility model also provides an electric vehicle, including the battery pack described in the above embodiments.

[0021] The beneficial effects of the lower housing of the battery pack and the battery pack according to the embodiments of this utility model include, for example:

[0022] The lower housing of the battery pack includes a lower housing body and reinforcing ribs. The lower housing body has a hollow cavity. By designing the lower housing body as hollow, the weight of the lower housing can be reduced, and the amount of material used can also be reduced, thus lowering costs. The reinforcing ribs are set in the hollow cavity. By setting the reinforcing ribs, the structural strength of the hollow lower housing can be improved, and the impact resistance of the lower housing can also be improved. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the lower housing of the battery pack provided in an embodiment of the present invention from a first-view perspective;

[0025] Figure 2 This is a schematic diagram of the lower housing of the battery pack provided in an embodiment of the present invention from a second perspective;

[0026] Figure 3 This is a schematic diagram of the lower housing of a battery pack with a liquid cooling pipe provided in an embodiment of this utility model.

[0027] Icons: 1000 - Lower housing of battery pack; 100 - Lower housing body; 110 - Hollow cavity; 200 - Reinforcing rib; 210 - First supporting part; 220 - Supporting part; 230 - Second supporting part; 300 - Support beam; 400 - First positioning track; 500 - Second positioning track; 600 - Liquid cooling pipe. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0034] In the power battery industry, the safety performance of new energy vehicle battery packs is particularly important, with structural safety being the foundation of all performance. The battery pack casing, besides meeting the structural strength and rigidity requirements of the battery pack itself, is also a major component of the vehicle's rigid frame, especially the bottom of the battery pack, which, in addition to rigidity requirements, must also have a certain degree of impact resistance. However, currently, most battery pack lower casings typically improve structural strength and bottom impact resistance by increasing wall thickness. This leads to an increase in the overall weight and cost of the battery pack, while also reducing its energy density.

[0035] Based on this, please refer to Figure 1 and Figure 2 The battery pack lower housing 1000 provided in the embodiments of this utility model can effectively improve the aforementioned technical problems. This battery pack lower housing 1000 can reduce weight and cost while improving structural strength and impact resistance. This battery pack lower housing 1000 is applied to battery packs, which can be used in electric vehicles and other electrical equipment. Both the battery pack and the electric vehicle / other electrical equipment having this battery pack lower housing 1000 have the same functions as described above, which will not be elaborated further here.

[0036] The electric vehicle provided in the embodiments of this utility model includes a vehicle body and a battery pack. The battery pack is disposed in the vehicle body and provides electrical energy to the vehicle body to realize the various functions of the vehicle body. Of course, the battery pack can also be applied to other electrical devices such as home robots, and is not limited thereto.

[0037] The battery pack in this embodiment includes multiple battery cells and a lower housing 1000, with all battery cells housed within the lower housing 1000. Furthermore, the battery pack also includes an upper housing, which, together with the lower housing, forms an installation space within which the multiple battery cells are evenly arranged. Of course, to achieve various functions, the battery pack may also include other structural components, such as liquid cooling components, which are not limited here.

[0038] Figure 1 This is a schematic diagram of the lower housing 1000 of the battery pack provided in an embodiment of the present invention from a first-view perspective; Figure 2 for Figure 1 A diagram from another perspective. (For example...) Figure 1 and Figure 2 As shown, the battery pack lower housing 1000 in this embodiment includes a lower housing body 100 and reinforcing ribs 200. The lower housing body 100 has a hollow cavity 110, and the reinforcing ribs 200 are disposed in the hollow cavity 110. By designing the lower housing body 100 as hollow, the weight of the lower housing can be reduced, and the amount of material used can also be reduced, thus lowering costs. By providing reinforcing ribs 200, the structural strength of the hollow lower housing can be improved, and the impact resistance of the lower housing can also be improved. In this embodiment, there are multiple reinforcing ribs 200, which are parallel and spaced apart along the width direction of the lower housing body 100. The number of reinforcing ribs 200 can be one, two, three, four, etc., depending on the actual length of the lower housing, and is not limited here.

[0039] Please continue reading. Figure 1 and Figure 2 In this embodiment, the reinforcing rib 200 is shaped like an "I". The "I"-shaped structure exhibits higher bending strength under vertical loads, capable of withstanding greater loads without easily deforming. Furthermore, designing the reinforcing rib 200 as an "I" shape effectively improves the overall structural rigidity. By concentrating material at the most effective bending resistance location, the structure becomes more robust against external deformation, reducing bending and buckling. The extended "I"-shaped reinforcing rib 200 enhances the rigidity and strength of the battery pack lower housing 1000. Of course, the reinforcing rib 200 can also be designed in other shapes such as straight or angled, and is not limited here. A straight reinforcing rib 200 is typically a single straight rib, usually with a rectangular cross-section. An angled reinforcing rib 200, by forming an angle with the main load direction, effectively distributes the load and reduces local stress concentration.

[0040] Specifically, in this embodiment, the reinforcing rib 200 includes a first abutment portion 210, a support portion 220, and a second abutment portion 230. One end of the support portion 220 is perpendicularly connected to the first abutment portion 210, and the other end of the support portion 220 is perpendicularly connected to the second abutment portion 230. The first abutment portion 210 and the second abutment portion 230 are respectively used to abut against the two inner surfaces of the hollow cavity 110 formed by the lower shell body 100. The thickness of the first abutment portion 210 gradually increases along the direction away from the central axis of the support portion 220 and towards the central axis of the support portion 220; and / or, the thickness of the second abutment portion 230 gradually increases along the direction away from the central axis of the support portion 220 and towards the central axis of the support portion 220. By designing the first abutment portion 210 and the second abutment portion 230 in this way, the stress on the reinforcing rib 200 can be dispersed, and the energy absorption efficiency can be improved. The energy absorption characteristics of the reinforcing rib 200 improve the impact resistance of the lower shell body 100. Of course, the thickness of all positions of the first supporting part 210 and the second supporting part 230 can also be designed to be the same, which is not limited here.

[0041] In addition, in order to further improve the structural strength of the lower housing 1000 of the battery pack, the support portion 220 in this embodiment extends along the length direction of the lower housing body 100; the length of the first abutment portion 210, the length of the support portion 220 and the length of the second abutment portion 230 are all the same as the length of the lower housing body 100.

[0042] To enhance the structural strength of the lower battery pack housing 1000, this embodiment further includes multiple support beams 300, with at least one support beam 300 positioned between adjacent reinforcing ribs 200. In this embodiment, the multiple support beams 300 are parallel and spaced apart along the width direction of the lower housing body 100. Alternatively, the multiple support beams 300 can also be parallel and spaced apart along the length direction of the lower housing; this is not limited here. In this embodiment, the support beams 300 are straight and solid. However, the shape of the support beams 300 can also be I-shaped, frustum-shaped, or other shapes; this is not limited here. The support beams 300 can also be designed as hollow structures. To provide sufficient support for the lower battery pack housing 1000, the length of each support beam 300 in this embodiment is the same as the length of the lower housing body 100. However, the length of the support beam 300 can also be less than the length of the lower housing body 100; this is not limited here.

[0043] Please see Figure 1 and Figure 2In this embodiment, the lower housing 1000 of the battery pack further includes a first positioning track 400 and a second positioning track 500. The first positioning track 400 and the second positioning track 500 are parallel and spaced apart on the lower housing body 100, and together they are used to clamp and limit the battery cells. By setting the first positioning track 400 and the second positioning track 500, the rigidity and strength of the lower housing 1000 of the battery pack are improved, while the assembly process is simplified, production efficiency is improved, and development costs are reduced. To further improve the structural strength of the first positioning guide or the second positioning guide, the cross-sectional shape of the first positioning guide and / or the second positioning guide in this embodiment is triangular. To reduce the weight of the lower housing 1000 of the battery pack, the cross-sectional shape of the first positioning guide and / or the second positioning guide is a hollow triangle. Of course, the first positioning guide and / or the second positioning guide can also be designed in other shapes and structures, such as a solid cuboid, which is not limited here.

[0044] Figure 3 This is a schematic diagram of the lower housing 1000 of the battery pack with liquid cooling pipes 600 provided in an embodiment of this utility model. To meet the thermal management requirements of the battery pack and save installation space, multiple liquid cooling pipes 600 can be installed within the hollow cavity 110 in this embodiment, with adjacent liquid cooling pipes 600 separated by reinforcing ribs 200. Placing the liquid cooling pipes 600 within the hollow cavity 110 allows for the installation of liquid cooling components without occupying other space in the battery pack, and also makes full use of the hollow space. Furthermore, to improve the safety performance of the battery pack, the hollow cavity 110 in this embodiment also stores fire extinguishing agent. The lower housing body 100 has a weak point; in the event of a battery fire or other safety issue, the weak point will be burned through, and the fire extinguishing agent will flow along the weak point to the side of the lower housing body 100 where the first positioning track 400 and the second positioning track 500 are located, i.e., towards the location of the battery cell, to achieve a fire extinguishing effect and ensure that the battery does not explode, thereby improving the safety performance of the battery pack.

[0045] The installation process of the battery pack is as follows: First, fix the lower housing 1000 of the battery pack on the tooling, and then attach the insulating protective layer to the cell contact surface of the first positioning rail 400 and the second positioning rail 500 respectively. Then, stack the cells to complete the assembly of the cells and positioning rails.

[0046] In summary, the lower housing 1000 of the battery pack includes a lower housing body 100 and a reinforcing rib 200. The lower housing body 100 has a hollow cavity 110, and the reinforcing rib 200 is disposed in the hollow cavity 110. By designing the lower housing body 100 as a hollow form, the weight of the lower housing can be reduced, and the amount of material used can also be reduced, thus lowering costs. By providing the reinforcing rib 200, the structural strength of the hollow lower housing can be improved, and the impact resistance of the lower housing can also be improved.

[0047] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery pack lower case, characterized by, include: The lower housing body (100) has a hollow cavity (110); A reinforcing rib (200) is disposed in the hollow cavity (110).

2. The battery pack lower case of claim 1, wherein, The reinforcing rib (200) is in the shape of an "I".

3. The battery pack lower case of claim 2, wherein, The reinforcing rib (200) includes a first abutting part (210), a supporting part (220), and a second abutting part (230). One end of the supporting part (220) is perpendicularly connected to the first abutting part (210), and the other end of the supporting part (220) is perpendicularly connected to the second abutting part (230). The first abutting part (210) and the second abutting part (230) are respectively used to abut against the two inner surfaces of the lower shell body (100) forming the hollow cavity (110). Along the direction from the central axis away from the support (220) to the central axis close to the support (220), the thickness of the first abutment (210) gradually increases; And / or, along the direction from the central axis away from the support (220) to the central axis near the support (220), the thickness of the second abutment (230) gradually increases.

4. The battery pack lower case of claim 3, wherein, The support portion (220) extends along the length direction of the lower housing body (100); the lengths of the first abutment portion (210), the support portion (220), and the second abutment portion (230) are all the same as the length of the lower housing body (100).

5. The battery pack lower case of claim 1, wherein, The number of the reinforcing ribs (200) is multiple, and the multiple reinforcing ribs (200) are arranged parallel to each other and spaced apart along the width direction of the lower shell body (100).

6. The battery pack lower case of claim 5, wherein, The lower housing (1000) of the battery pack also includes a plurality of support beams (300), and at least one of the support beams (300) is provided between two adjacent reinforcing ribs (200).

7. The battery pack lower case of claim 6, wherein, The plurality of support beams (300) are arranged parallel to and spaced apart along the width direction of the lower housing body (100).

8. The battery pack lower case of claim 1, wherein, The lower housing (1000) of the battery pack also includes a first positioning track (400) and a second positioning track (500). The first positioning track (400) and the second positioning track (500) are parallel and spaced apart on the lower housing body (100). The first positioning track (400) and the second positioning track (500) are used together to clamp and limit the battery cells.

9. A battery pack, characterized by, It includes a plurality of battery cells and a lower housing (1000) of the battery pack as described in any one of claims 1-8, wherein the plurality of battery cells are all placed in the lower housing (1000).

10. An electric vehicle, characterized by Includes the battery pack as described in claim 9.

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