Battery box body

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery box body which comprises a box body assembly and a box cover, the box cover comprises a first composite layer and a rigid enhancement layer connected to one side of the first composite layer in the thickness direction, and the first composite layer and the rigid enhancement layer are both connected to the box body assembly. The battery box body provided by the utility model has higher rigidity and structural strength, so that the internal structure of the battery box body can be better protected, and the battery box body has higher reliability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery housing. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Batteries are assembled in electric vehicles in the form of battery packs. A battery pack includes a battery housing and battery modules installed within the housing. The battery housing includes a casing and a cover, with the cover positioned over the open end of the casing to create a relatively sealed mounting space in which the battery modules are located. As range requirements increase, battery packs are typically larger, and so is the cover. The cover is usually made of plastic, and its edges are fixedly connected to the casing for support. However, the central area of ​​the cover has lower rigidity and is more prone to collapse, potentially interfering with the battery modules inside the housing.

[0004] Therefore, there is an urgent need for a battery housing with high rigidity. Utility Model Content

[0005] The purpose of this utility model is to provide a battery box to solve the problems of weak structural strength and low rigidity of existing battery boxes.

[0006] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0007] A battery housing includes a housing assembly and a housing cover. The housing cover includes a first composite layer and a rigid reinforcing layer connected to one side of the first composite layer in the thickness direction. Both the first composite layer and the rigid reinforcing layer are connected to the housing assembly.

[0008] The beneficial effects of this utility model are:

[0009] The battery case provided by this utility model includes a case cover comprising a first composite layer and a rigid reinforcement layer. The first composite layer has a certain structural strength to protect the battery module inside the battery case and ensures the insulation performance of the case cover. The rigid reinforcement layer is connected to one side of the first composite layer in the thickness direction to improve the rigidity of the case cover and reduce the probability of deformation. Both the rigid reinforcement layer and the first composite layer are connected to the case assembly. On the one hand, this improves the reliability and strength of the connection between the case cover and the case assembly. On the other hand, both the first composite layer and the rigid reinforcement layer can transmit the pressure to the case assembly, improving the overall rigidity and structural strength of the battery case. This allows the battery case to better protect its internal structure and has high reliability. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0011] Figure 1 This is an exploded view of the battery box provided in an embodiment of the present invention;

[0012] Figure 2 This is a first top view of the box cover provided in this embodiment of the utility model;

[0013] Figure 3 This is an exploded view of the box lid provided in an embodiment of the present utility model;

[0014] Figure 4 This is a schematic diagram of the rigid reinforcement layer provided in an embodiment of the present invention;

[0015] Figure 5 This is a schematic diagram of the structure of the box lid provided in an embodiment of this utility model;

[0016] Figure 6 This is a second top view of the box cover provided in this embodiment of the utility model.

[0017] In the picture:

[0018] 100. Box assembly; 110. Box; 120. Support beam;

[0019] 200, Box lid; 210, First composite layer; 220, Rigid reinforcement layer; 221, First reinforcing bar; 222, Second reinforcing bar; 230, Second composite layer. Detailed Implementation

[0020] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0021] 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.

[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this utility model, unless otherwise explicitly 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 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 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. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0024] In the description of this embodiment, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., are based on the orientation or positional relationships shown in the accompanying drawings and are only for ease of description and simplification of operation. They 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. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0025] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] This embodiment provides a battery housing with high rigidity and structural strength, ensuring the protection of the battery modules inside the battery housing.

[0028] For example, such as Figure 1 As shown, the battery housing includes a housing assembly 100 and a cover 200. The housing assembly 100 has an opening, and the cover 200 is disposed at the opening end of the housing assembly 100. The housing assembly 100 and the cover 200 cooperate to form a receiving cavity, in which the battery module is assembled. Wherein, as... Figure 2 As shown, the lid 200 includes a first composite layer 210 and a rigid reinforcing layer 220 connected to one side of the first composite layer 210 in the thickness direction. Exemplarily, the rigidity of the rigid reinforcing layer 220 is greater than the rigidity of the first composite layer 210. The material of the first composite layer 210 is a composite material; for example, the first composite layer 210 can be a resin material or a material composed of a resin material and glass fiber. This embodiment does not limit this.

[0029] The rigidity of the rigid reinforcement layer 220 is greater than a predetermined value, thereby improving the overall rigidity of the lid 200. For example, the rigid reinforcement layer 220 can be made of a material with high rigidity, such as metal; this embodiment does not limit this. It should be noted that the thickness direction of the rigid reinforcement layer 220 is the same as the thickness direction of the first composite layer 210, allowing the lid 200 formed by the first composite layer 210 and the rigid reinforcement layer 220 to have a smaller thickness.

[0030] In this embodiment, both the first composite layer 210 and the rigid reinforcement layer 220 are connected to the housing assembly 100, forming a dual connection with the housing assembly 100, which improves the connection strength and reliability between the cover 200 and the housing assembly 100. The rigid reinforcement layer 220's connection to the housing assembly 100 allows it to not only prevent deformation of the cover 200 due to its own rigidity, but also to transfer pressure to the housing assembly 100 when the cover 200 is subjected to significant pressure, thus providing support and further reducing the probability of deformation of the cover 200, thereby improving the rigidity and strength of the entire battery housing.

[0031] The battery case provided in this embodiment includes a case cover 200 comprising a first composite layer 210 and a rigid reinforcement layer 220. The first composite layer 210 has a certain structural strength to protect the battery module inside the battery case and ensures the insulation performance of the case cover 200. The rigid reinforcement layer 220 is connected to one side of the first composite layer 210 in the thickness direction to improve the rigidity of the case cover 200 and reduce the probability of deformation. Both the rigid reinforcement layer 220 and the first composite layer 210 are connected to the case assembly 100. On the one hand, this improves the reliability and strength of the connection between the case cover 200 and the case assembly 100. On the other hand, both the first composite layer 210 and the rigid reinforcement layer 220 can transmit the pressure to the case assembly 100, improving the overall rigidity and structural strength of the battery case. This allows the battery case to better protect its internal structure and has high reliability.

[0032] To facilitate the connection between the rigid reinforcement layer 220 and the housing assembly 100, exemplarily, such as Figure 1 As shown, the housing assembly 100 includes a housing 110 and a support beam 120 disposed within the housing 110. A first composite layer 210 is connected to the housing 110; for example, the edge of the first composite layer 210 is connected to the open end of the housing 110 to form a relatively closed accommodating cavity. A rigid reinforcement layer 220 is connected to the support beam 120, so that the rigid reinforcement layer 220 does not need to extend to the inner wall of the housing 110, but is connected to the housing 110 through the support beam 120, which reduces the complexity of the rigid reinforcement layer 220 structure and facilitates the assembly of the rigid reinforcement layer 220 and the support beam 120.

[0033] In some alternative embodiments, the support beam 120 may be provided only at the open end of the housing 110, that is, the support beam 120 does not extend into the housing 110. In this case, the support beam 120 is only used to connect the rigid reinforcement layer 220.

[0034] In some alternative embodiments, the support beam 120 may also extend into the interior of the housing 110 and form a partition plate that can divide the accommodating cavity into multiple sub-cavities, each of which is used to house a battery.

[0035] For example, the support beam 120 can extend along the length or width of the box body 110, and both ends of the support beam 120 are connected to the box body 110, so that the support beam 120 can also support the box body 110 in the length or width direction, reducing the probability of the box body 110 deforming under the action of external force and improving the rigidity of the box body 110.

[0036] In one possible implementation, please continue to see Figure 1Multiple support beams 120 are provided, including support beams 120 extending along the length direction of box body 110 and support beams 120 extending along the width direction of box body 110, so as to support box body 110 in the length and width directions and further prevent box body 110 from deforming.

[0037] Optionally, the support beam 120 can be made of metal or non-metal, and this embodiment does not limit this. The connection between the support beam 120 and the rigid reinforcement layer 220 can be a detachable connection or a non-detachable connection. For example, it can be connected by fasteners, including but not limited to bolts. The support beam 120 and the rigid reinforcement layer 220 can also be connected by welding or other methods, and this embodiment does not limit this.

[0038] Optionally, the area of ​​the rigid reinforcement layer 220 is equal to or smaller than the area of ​​the cover 200. The area of ​​the rigid reinforcement layer 220 cannot be too large, as this would result in excessive weight of the cover 200, hindering the lightweighting of the battery casing. Conversely, the area of ​​the rigid reinforcement layer 220 cannot be too small, as this would lead to a very small area of ​​rigid reinforcement in the cover 200, making it susceptible to collapse and deformation, thus failing to improve the rigidity of the cover 200. For example, the ratio of the area of ​​the rigid reinforcement layer 220 to the area of ​​the cover 200 can be 0.4, 0.5, 0.8, 0.9, or 1.

[0039] In some optional embodiments, the ratio of the thickness of the rigid reinforcement layer 220 to the thickness of the cover 200 is 0.01-2.5. It should be noted that in this embodiment, the units for the thickness of both the rigid reinforcement layer 220 and the cover 200 are mm. The thickness of the rigid reinforcement layer 220 cannot be too large, as this would result in an excessively large cover 200, leading to an overall excessive size and weight, which is detrimental to the miniaturization and weight reduction of the battery case. Conversely, the thickness of the rigid reinforcement layer 220 cannot be too small, as this would result in low rigidity of the rigid reinforcement layer 220, with little improvement in the rigidity of the cover 200, and the cover 200 would still collapse and deform, failing to improve the overall rigidity of the cover 200. For example, the ratio of the thickness of the rigid reinforcement layer 220 to the thickness of the cover 200 can be 0.01, 0.1, 0.5, 1, 1.25, 1.5, 2, 2.5, etc.

[0040] For example, the thickness of the rigid reinforcement layer 220 ranges from 0.2 mm to 1.5 mm. For instance, the thickness of the rigid reinforcement layer 220 is 0.2 mm, 0.3 mm, 0.4 mm, 1.8 mm, 1 mm, 1.2 mm, 1.5 mm, etc.

[0041] Optionally, the thickness of the lid 200 ranges from 0.6mm to 2mm. For example, the thickness range of the lid 200 is 0.6mm, 1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 2mm, etc. It should be noted that the thickness of the lid 200 and the thickness of the rigid reinforcement layer 220 satisfy the corresponding relationship mentioned above, and are not arbitrarily selected within the above range.

[0042] To further reduce the weight of the lid 200, in one possible implementation, such as Figure 3 and Figure 4 As shown, the rigid reinforcement layer 220 has a frame structure. This allows the rigid reinforcement layer 220 to have high rigidity while maintaining a low weight, which in turn reduces the weight of the cover 200. Furthermore, the frame structure of the rigid reinforcement layer 220 allows for more connection points between the support beam 120 and the rigid reinforcement layer 220, further enhancing rigidity.

[0043] The specific structure of a frame structure can be varied; this embodiment presents one feasible frame structure. For example... Figure 4 As shown, the rigid reinforcement layer 220 includes two first reinforcing rods 221 disposed opposite to each other and a plurality of second reinforcing rods 222 connected between the two first reinforcing rods 221. The plurality of second reinforcing rods 222 includes at least one pair of intersecting second reinforcing rods 222. It can be seen that the frame structure in this embodiment presents a cage-like structure. This results in high structural strength of the rigid reinforcement layer 220 in all directions, thereby increasing the rigidity and structural strength of the lid 200 in all directions.

[0044] It should be noted that, as Figure 4 As shown, some of the multiple second reinforcing rods 222 may not be intersecting. For example, multiple pairs of intersecting second reinforcing rods 222 may be provided and arranged sequentially along the extending direction of the first reinforcing rod 221. A second reinforcing rod 222 is provided between two adjacent pairs of second reinforcing rods 222 to form a mesh-like frame structure, which has high structural strength and low weight. Of course, it is understood that all the second reinforcing rods 222 may also be intersecting, but this embodiment does not limit this.

[0045] In this embodiment, as Figure 4 As shown, the two first reinforcing rods 221 can be arranged in parallel, making the shape of the rigid reinforcing layer 220 more regular and facilitating its fit with the first composite layer 210. It is understood that the two first reinforcing rods 221 can also be arranged in a non-parallel manner; this embodiment does not limit this arrangement.

[0046] Since the edge of the first composite layer 210 is connected to the housing 110 and can be supported by the housing 110, the middle part of the first composite layer 210 along its length is the area with the lowest rigidity and weakest structural strength. Therefore, in order to improve the overall rigidity of the housing cover 200, such as... Figure 6 As shown, the rigid reinforcement layer 220 is disposed in the middle of the length direction of the box cover 200. Since the size of the first composite layer 210 is exactly the same as the size of the box cover 200, the rigid reinforcement layer 220 is connected to the middle of the first composite layer 210 in the length direction to improve the rigidity of the middle of the first composite layer 210, thereby making the overall structural strength of the box cover 200 higher.

[0047] In some optional embodiments, the length direction of the rigid reinforcement layer 220 is the same as the width direction of the lid 200. That is, the rigid reinforcement layer 220 extends along the width direction of the lid 200, so that the first composite layer 210 can be connected to the rigid reinforcement layer 220 in the middle of the length direction of the lid 200 and in most of the width direction of the lid 200, which further improves the structural strength and rigidity of the middle part of the length direction of the box 110.

[0048] In some other alternative embodiments, the length direction of the rigid reinforcement layer 220 is the same as the length direction of the lid 200, that is, the rigid reinforcement layer 220 extends along the length direction of the lid 200. This embodiment does not limit this.

[0049] In this embodiment, the relative positions of the rigid reinforcement layer 220 and the first composite layer 210 can be two.

[0050] The first relative arrangement of the rigid reinforcement layer 220 and the first composite layer 210 is as follows: the rigid reinforcement layer 220 is disposed on the side of the first composite layer 210 facing the housing assembly 100. Furthermore, the battery housing also includes an insulating buffer layer disposed on the side of the rigid reinforcement layer 220 facing the housing assembly 100, the orthographic projection of the insulating buffer layer on the cover 200 covering the rigid reinforcement layer 220. The insulating buffer layer serves as insulation between the cover 200 and the internal structure of the housing 110, ensuring the insulation performance of the cover 200. The area of ​​the insulating buffer layer can be smaller than the area of ​​the first composite layer 210, so that the weight of the cover 200 can be reduced while ensuring the structural strength of the cover 200. The material of the insulating buffer layer can be a composite material or other insulating material; this embodiment does not limit this. By providing the insulating buffer layer, the rigid reinforcement layer 220 can be made of metal, allowing the rigid reinforcement layer 220 to have greater rigidity.

[0051] The second relative arrangement of the rigid reinforcing layer 220 and the first composite layer 210 is as follows: the rigid reinforcing layer 220 is disposed on the side of the first composite layer 210 facing away from the housing assembly 100. In this way, the first composite layer 210 faces the structure inside the housing 110, thereby ensuring the insulation performance of the housing cover 200.

[0052] To ensure the insulation performance of the cover 200 while preventing the rigid reinforcement layer 220 from being exposed, in one possible embodiment, such as Figure 5 As shown, the cover 200 also includes a second composite layer 230. The second composite layer 230 is connected to the first composite layer 210, and a rigid reinforcement layer 220 is embedded or sandwiched between the first composite layer 210 and the second composite layer 230. That is, the first composite layer 210, the rigid reinforcement layer 220, and the second composite layer 230 form a three-layer sandwich structure. Thus, on the one hand, the first composite layer 210 or the second composite layer 230 faces inwards towards the casing 110, ensuring insulation between the cover 200 and the battery module, guaranteeing the insulation performance of the cover 200; on the other hand, the rigid reinforcement layer 220 is not exposed, reducing the risk of corrosion and rust, ensuring the rigidity of the rigid reinforcement layer 220, and consequently, the rigidity of the cover 200.

[0053] For example, the rigid reinforcement layer 220 can be embedded between the first composite layer 210 and the second composite layer 230. For instance, at least one of the first composite layer 210 and the second composite layer 230 has a shallow groove, and the rigid reinforcement layer 220 is embedded in the shallow groove and positioned so that the rigid reinforcement layer 220 does not move relative to the first composite layer 210 and the second composite layer 230; and the shallow groove makes the area of ​​the first composite layer 210 and the second composite layer 230 corresponding to the rigid reinforcement layer 220 thinner, so it does not increase the thickness of the lid 200, which is beneficial to the miniaturization and weight reduction of the lid 200.

[0054] It should be noted that the material of the second composite layer 230 is a composite material. For example, the first composite layer 210 can be a resin material or a material composed of resin material and glass fiber. This embodiment does not limit this.

[0055] The battery case provided in this embodiment has a cover 200 made of insulating material with a first composite layer 210 and a second composite layer 230, and an internal rigid reinforcing layer, which ensures insulation while improving the structural strength of the cover 200. Furthermore, the rigid reinforcing layer 220 has a cage-like structure and is fixed to the support beam 120 of the case assembly 100, increasing the rigidity of the entire battery case and thus improving its safety performance.

[0056] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery housing, characterized in that, include: The box assembly (100) and the box cover (200) include a first composite layer (210) and a rigid reinforcement layer (220) connected to one side of the thickness direction of the first composite layer (210). Both the first composite layer (210) and the rigid reinforcement layer (220) are connected to the box assembly (100).

2. The battery housing according to claim 1, characterized in that, The housing assembly (100) includes a housing (110) and a support beam (120) disposed within the housing (110). The first composite layer (210) is connected to the housing (110), and the rigidity reinforcement layer (220) is connected to the support beam (120).

3. The battery housing according to claim 1, characterized in that, The area of ​​the rigid reinforcement layer (220) is equal to or less than the area of ​​the box cover (200).

4. The battery housing according to claim 1, characterized in that, The ratio of the thickness of the rigid reinforcement layer (220) to the thickness of the box cover (200) is 0.01-2.

5.

5. The battery housing according to claim 4, characterized in that, The thickness of the rigid reinforcement layer (220) ranges from 0.2 mm to 1.5 mm.

6. The battery housing according to claim 1, characterized in that, The rigid reinforcement layer (220) is a frame structure.

7. The battery housing according to claim 6, characterized in that, The rigid reinforcement layer (220) includes two first reinforcing rods (221) arranged opposite to each other and a plurality of second reinforcing rods (222) connected between the two first reinforcing rods (221), wherein the plurality of second reinforcing rods (222) includes at least one pair of intersecting second reinforcing rods (222).

8. The battery housing according to any one of claims 1-7, characterized in that, The lid (200) further includes a second composite layer (230), which is connected to the first composite layer (210), and the rigid reinforcement layer (220) is embedded or sandwiched between the first composite layer (210) and the second composite layer (230).

9. The battery housing according to any one of claims 1-7, characterized in that, The rigid reinforcement layer (220) is disposed on the side of the first composite layer (210) facing the housing assembly (100). The battery housing also includes an insulating buffer layer disposed on the side of the rigid reinforcement layer (220) facing the housing assembly (100). The orthographic projection of the insulating buffer layer on the housing cover (200) covers the rigid reinforcement layer (220). Alternatively, the rigid reinforcement layer (220) may be disposed on the side of the first composite layer (210) facing away from the housing assembly (100).

10. The battery housing according to any one of claims 1-7, characterized in that, The rigid reinforcement layer (220) is disposed at the middle of the box cover (200) in the length direction; and / or, the length direction of the rigid reinforcement layer (220) is the same as the width direction of the box cover (200).

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