Battery pack housing and battery pack

Abstract

The utility model belongs to power battery technical field discloses a battery package shell and battery package. It includes composite shell and at least one heat insulation layer. Composite shell includes metal shell and at least one fiber shell, and fiber shell and metal shell are mutually stacked, and heat insulation layer is arranged on any side of composite shell along the stacking direction of itself to be used for the heat insulation of composite shell. The battery package shell can reduce the weight of itself, improve the heat absorption and insulation and high temperature resistance, and improve the safety.

Description

Technical Field

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

[0002] With the increasing sales and ownership of electric vehicles and the booming development of low-altitude aircraft, the requirements for the weight and safety of components in electric vehicles and low-altitude aircraft are becoming increasingly stringent under increasingly fierce market competition. The power battery, as a crucial component, accounts for more than 25% of the overall structure's weight, and battery thermal runaway is a key focus of the industry. How to reduce battery pack weight and improve battery pack safety is one of the important problems that needs to be solved.

[0003] Therefore, there is an urgent need for a battery pack casing and battery pack to solve the above-mentioned technical problems. Utility Model Content

[0004] One objective of this invention is to provide a battery pack casing that can reduce its weight, improve its heat absorption, insulation, and high-temperature resistance, and enhance its safety.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery pack housing includes a composite housing and at least one heat insulation layer. The composite housing includes a metal housing and at least one fiber housing, which are stacked on top of each other. The heat insulation layer is disposed on either side of the composite housing along its stacking direction for heat insulation of the composite housing.

[0007] Optionally, the thickness of the aforementioned metal casing is T1, where 0.5 mm ≤ T1 ≤ 0.7 mm; and / or,

[0008] The thickness of the aforementioned fiber shell is T2, 0.6 mm ≤ T2 ≤ 1 mm; and / or,

[0009] The thickness of the above-mentioned insulation layer is T3, 0.35mm≤T3≤0.5mm.

[0010] Optionally, the aforementioned metal casing is stamped; and / or,

[0011] The aforementioned fiber shell and the aforementioned metal shell are hot-pressed; and / or,

[0012] The aforementioned heat insulation layer is sprayed onto the outer surface of the aforementioned composite shell.

[0013] Optionally, the aforementioned metal casing includes an aluminum alloy layer; and / or,

[0014] The aforementioned fiber shell includes a carbon fiber shell or a glass fiber shell; and / or,

[0015] The aforementioned insulation layer includes a polymer layer.

[0016] Optionally, at least a portion of the outer surface of the fiber shell is provided with a matrix material layer; and / or the fiber shell is filled with a matrix material.

[0017] Optionally, the composite housing is further provided with mounting holes for external assembly of the battery pack housing.

[0018] Optionally, the metal shell and the fiber shell described above have the same structure.

[0019] Optionally, the aforementioned fiber shell is provided, and the fiber shell is disposed on any side of the aforementioned metal shell along the stacking direction of the aforementioned composite shell, or...

[0020] The aforementioned fiber shell is provided in two parts, and the two fiber shells are respectively disposed on both sides of the aforementioned metal shell along the stacking direction of the aforementioned composite shell.

[0021] Optionally, one heat insulation layer is provided, and the heat insulation layer is provided on any side of the composite shell along its own stacking direction; or,

[0022] There are two heat insulation layers, which are respectively disposed on both sides of the composite shell along its stacking direction.

[0023] Another objective of this invention is to provide a battery pack, including the aforementioned battery pack casing, which can reduce its weight, improve its heat absorption, insulation, and high-temperature resistance performance, and enhance its safety.

[0024] The beneficial effects of this utility model are:

[0025] This utility model provides a battery pack housing and a battery pack. By employing a composite housing, namely a metal housing and at least one fiber housing stacked together, the structural strength of the battery pack housing is ensured while its weight is reduced, achieving a lightweight design that lowers the weight of the battery pack. Furthermore, the composite housing has a heat insulation layer on at least one side along its stacking direction to effectively delay heat conduction. This mitigates heat spread and reduces heat radiation to the vehicle or machine in the event of thermal runaway, thus improving battery pack safety. Attached Figure Description

[0026] Figure 1 This is an isometric view of the battery pack housing provided in Embodiment 1 of this utility model;

[0027] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0028] Figure 3 This is an exploded view of the battery pack casing provided in Embodiment 1 of this utility model;

[0029] Figure 4 This is an exploded view of the battery pack casing provided in Embodiment 2 of this utility model;

[0030] Figure 5 This is an exploded view of the battery pack casing provided in Embodiment 3 of this utility model;

[0031] Figure 6 This is an exploded view of the battery pack casing provided in Embodiment 4 of this utility model.

[0032] In the picture:

[0033] 10. Composite housing; 101. Mounting hole; 11. Metal housing; 12. Fiber housing;

[0034] 20. Insulation layer. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] 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 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.

[0037] In this invention, 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.

[0038] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] Example 1

[0040] Please refer to Figures 1 to 3 This embodiment provides a battery pack housing, which includes a composite housing 10 and at least one heat insulation layer 20. The composite housing 10 includes a metal housing 11 and at least one fiber housing 12, the fiber housing 12 and the metal housing 11 being stacked on top of each other, and the heat insulation layer 20 being disposed on either side of the composite housing 10 along its stacking direction for heat insulation of the composite housing 10.

[0041] In this embodiment, the battery pack housing is constructed by stacking a composite housing 10, namely a metal housing 11 and at least one fiber housing 12. This not only ensures the structural strength of the battery pack housing but also reduces its weight, achieving a lightweight design and thus reducing the weight of the battery pack. Furthermore, the composite housing 10 has a heat insulation layer 20 on at least one side along its stacking direction to effectively delay heat conduction. This reduces heat spread and minimizes heat radiation to the vehicle or machine in the event of thermal runaway, thereby improving battery pack safety.

[0042] It should be noted that the number of the aforementioned fiber shell 12 can be set to one or two, and the aforementioned heat insulation layer 20 can also be set to one or two, without specific limitation here.

[0043] For example, in this embodiment, two fiber shells 12 are provided, and the two fiber shells 12 are respectively disposed on both sides of the metal shell 11 along the stacking direction of the composite shell 10, which can effectively reduce the weight of the metal shell 11 and improve the lightweighting of the battery pack shell.

[0044] Furthermore, two heat insulation layers 20 are provided, one on each side of the composite shell 10 along its stacking direction. Specifically, the two heat insulation layers 20 are respectively located on the side of the two fiber shells 12 away from the metal shell 11 along the stacking direction of the composite shell 10. This arrangement achieves the flame-retardant effect of the battery pack shell, effectively delaying heat conduction. In the event of thermal runaway within the battery pack using this shell, it slows heat propagation, reduces heat radiation to the entire vehicle or machine, and improves the safety of the battery pack.

[0045] The metal casing 11 and the fiber casing 12 have the same structure to facilitate their connection, thereby forming a battery pack casing.

[0046] Optionally, the metal casing 11 and the fiber casing 12 can be plate-shaped or U-shaped, etc., and can be selected according to actual needs. For example, in this embodiment, both the metal casing 11 and the fiber casing 12 are U-shaped structures with fixed flanges to achieve the encapsulation of the internal structure of the battery pack.

[0047] In this embodiment, the metal casing 11 includes an aluminum alloy layer. The aluminum alloy material has a lower density than other materials, which makes the metal casing 11 lighter and helps to reduce the weight of the battery pack casing.

[0048] Furthermore, the aforementioned fiber housing 12 includes a carbon fiber housing 12 or a glass fiber housing 12. The use of fiber materials results in higher strength, greater rigidity, and lower density, thereby further contributing to a reduction in the weight of the battery pack housing. It also possesses electromagnetic shielding capabilities, aiding in heat dissipation and protection of the battery pack.

[0049] Optionally, at least a portion of the outer surface of the fiber shell 12 is provided with a matrix material layer; and / or the fiber shell 12 is filled with a matrix material to enhance its own strength and give it certain waterproof properties.

[0050] Preferably, the outer surface of the fiber shell 12 is provided with a matrix material layer and the fiber shell 12 is filled with matrix material. This arrangement greatly increases the strength and waterproof effect of the fiber shell 12, thereby making the battery pack shell stronger.

[0051] Alternatively, both the matrix material layer and the matrix material may include materials such as epoxy resin, polyurethane resin or ABS resin, which have certain waterproof properties and can enhance the strength of the fiber shell 12, without specific limitations.

[0052] For example, the outer surface of the fiber shell 12 is provided with an epoxy resin layer, and the fiber shell 12 is filled with epoxy resin. That is, the fiber shell 12 is formed after the fiber cloth is coated with epoxy resin. This arrangement helps the fiber shell 12 to be formed, and increases the waterproof performance, improves the mechanical strength, and improves the insulation and sealing effect.

[0053] Furthermore, the aforementioned insulation layer 20 includes a polymer layer, which has a high degree of heat insulation, and is also environmentally friendly and durable.

[0054] Optionally, the polymer layer comprises a polymer matrix and a thermal insulation filler, which are composited to form a thermal insulation coating. The polymer matrix can be made of materials such as acrylate, polyurethane, epoxy resin, or polyimide, while the thermal insulation filler can be made of thermal insulation materials such as silica or alumina. These materials offer superior thermal insulation performance, extremely low thermal conductivity, and are also corrosion-resistant and insulating.

[0055] Specifically, the thickness of the metal casing 11 is T1, 0.5mm≤T1≤0.7mm; and / or the thickness of the fiber casing 12 is T2, 0.6mm≤T2≤1mm; and / or the thickness of the heat insulation layer 20 is T3, 0.35mm≤T3≤0.5mm. This is a preferred thickness range so that the battery pack casing has good structural strength, light weight, and good heat insulation effect.

[0056] Taking the battery pack casing in this embodiment as an example, the metal casing 11 has a thickness of 0.5 mm, the fiber casing 12 has a thickness of 0.6 mm, and the heat insulation layer 20 has a thickness of 0.35 mm. Traditional aluminum alloy battery pack casings typically have a thickness of 1.2 mm or more. By comparison, while maintaining a strength no less than that of traditional aluminum alloy battery pack casings, the battery pack casing in this embodiment is more than 20% lighter than that made of aluminum alloy.

[0057] Furthermore, the aforementioned metal casing 11 is stamped with high precision, good consistency, high production efficiency, and high material utilization.

[0058] Furthermore, the fiber shell 12 and the metal shell 11 are hot-pressed. Specifically, after the fiber cloth is coated with epoxy resin, it is directly placed on the metal shell 11 for hot pressing. Hot pressing helps to make the structure of the fiber shell 12 and the metal shell 11 consistent, improves the material properties, and allows the two to be directly integrated without the need for other steps to fix them.

[0059] Furthermore, the heat insulation layer 20 is sprayed onto the outer surface of the composite housing 10, which makes production easier and improves production efficiency. It also allows the heat insulation layer 20 to completely wrap the outer surface of the corresponding position of the entire composite housing 10, forming a fully covered heat insulation wrapping layer, thereby improving the heat insulation effect of the battery pack housing.

[0060] Furthermore, the composite housing 10 is also provided with a mounting hole 101 for external assembly of the battery pack housing. The mounting hole 101 is provided on the fixing flange of the U-shaped structure in this embodiment for connection and engagement with other structures.

[0061] This embodiment also provides a battery pack, which includes the battery pack housing described in any of the above-described solutions. By adopting the aforementioned battery pack housing, the battery pack significantly reduces its weight, improves its lightweight design, and provides better heat insulation, effectively delaying heat conduction. This slows down heat spread when thermal runaway occurs inside the battery pack, reduces heat radiation to the entire vehicle or machine, and improves the safety of the battery pack.

[0062] It should be noted that the battery pack includes a first housing and a second housing. One of the first housing and the second housing serves as a casing, and the other serves as a cover. The two are sealed together to house and protect the batteries. The first housing and / or the second housing are made using the battery pack casing of this embodiment, and their design can be adapted to actual needs, without specific limitations here.

[0063] Example 2

[0064] This embodiment provides a battery pack housing and a battery pack. The difference between this embodiment and Embodiment 1 is that the number of fiber housing 12 and heat insulation layer 20 is different.

[0065] Please refer to Figure 4 In this embodiment, the fiber shell 12 is provided and is disposed on either side of the metal shell 11 along the stacking direction of the composite shell 10. This arrangement enables a lightweight design of the battery pack shell, reduces the number of parts, reduces related manufacturing processes, and improves production efficiency. It should be noted that... Figure 4 Only the case where the fiber shell 12 is disposed on one side of the metal shell 11 along the stacking direction of the composite shell 10 is shown. Of course, the fiber shell 12 may also be disposed on the other side of the metal shell 11 along the stacking direction of the composite shell 10 (not shown in the figure), and no specific limitation is made here.

[0066] Furthermore, a heat insulation layer 20 is provided, and the heat insulation layer 20 is disposed on either side of the composite shell 10 along its own stacking direction. Specifically, the heat insulation layer 20 is disposed on the side of the fiber shell 12 away from the metal shell 11 along the stacking direction of the composite shell 10, or on the side of the metal shell 11 away from the fiber shell 12 along the stacking direction of the composite shell 10. This arrangement achieves the flame-retardant effect of the battery pack shell, effectively delaying heat conduction. This slows down heat spread when thermal runaway occurs inside the battery pack using this shell, reducing heat radiation to the entire vehicle or machine and improving the safety of the battery pack. It should be noted that... Figure 4 Only the case where the insulation layer 20 is disposed on the side of the fiber shell 12 away from the metal shell 11 along the stacking direction of the composite shell 10 is shown. Of course, the insulation layer 20 may also be disposed on the side of the metal shell 11 away from the fiber shell 12 along the stacking direction of the composite shell 10 (not shown in the figure), and is not specifically limited here.

[0067] Example 3

[0068] This embodiment provides a battery pack housing and a battery pack. The difference between this embodiment and Embodiment 1 is that the number of fiber housings 12 is different; the difference between this embodiment and Embodiment 2 is that the number of heat insulation layers 20 is different.

[0069] Please refer to Figure 5 In this embodiment, the fiber shell 12 is provided and is disposed on either side of the metal shell 11 along the stacking direction of the composite shell 10. This arrangement enables a lightweight design of the battery pack shell, reduces the number of parts, reduces related manufacturing processes, and improves production efficiency. It should be noted that... Figure 5 Only the case where the fiber shell 12 is disposed on one side of the metal shell 11 along the stacking direction of the composite shell 10 is shown. Of course, the fiber shell 12 may also be disposed on the other side of the metal shell 11 along the stacking direction of the composite shell 10 (not shown in the figure), and no specific limitation is made here.

[0070] Furthermore, two heat insulation layers 20 are provided, one on each side of the composite shell 10 along its stacking direction. Specifically, one of the two heat insulation layers 20 is located on the side of the fiber shell 12 away from the metal shell 11 along the stacking direction of the composite shell 10, and the other is located on the side of the metal shell 11 away from the fiber shell 12 along the stacking direction of the composite shell 10. This arrangement achieves a flame-retardant effect for the battery pack shell, and the flame-retardant effect is excellent. It effectively delays heat conduction, thus slowing down heat spread when thermal runaway occurs inside the battery pack using this battery pack shell, reducing heat radiation to the entire vehicle or machine, and improving the safety of the battery pack.

[0071] Example 4

[0072] This embodiment provides a battery pack housing and a battery pack. The difference between this embodiment and embodiment one is that the number of heat insulation layers 20 is different; the difference between this embodiment and embodiment two is that the number of fiber housings 12 is different; and the difference between this embodiment and embodiment three is that the number of fiber housings 12 and heat insulation layers 20 are different.

[0073] Please refer to Figure 6 In this embodiment, two fiber shells 12 are provided, and the two fiber shells 12 are disposed on both sides of the metal shell 11 along the stacking direction of the composite shell 10. This arrangement enables a lightweight design of the battery pack shell, effectively reducing the weight of the metal shell 11.

[0074] Furthermore, a heat insulation layer 20 is provided, and the heat insulation layer 20 is disposed on any side of the composite shell 10 along its own stacking direction. Specifically, the heat insulation layer 20 is disposed on the side of any fiber shell 12 away from the metal shell 11 along the stacking direction of the composite shell 10. This arrangement achieves the flame-retardant effect of the battery pack shell, effectively delays heat conduction, and slows down heat spread when thermal runaway occurs inside the battery pack using this battery pack shell, reducing heat radiation to the entire vehicle or machine and improving the safety of the battery pack. It should be noted that... Figure 6 This diagram only shows the case where the insulation layer 20 is disposed on the side of one of the fiber shells 12 away from the metal shell 11 along the stacking direction of the composite shell 10. Of course, the insulation layer 20 may also be disposed on the side of the other fiber shell 12 away from the metal shell 11 along the stacking direction of the composite shell 10 (not shown in the figure), and is not specifically limited here.

[0075] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack casing, characterized in that, The battery pack housing includes a composite housing (10) and at least one heat insulation layer (20). The composite housing (10) includes a metal housing (11) and at least one fiber housing (12). The fiber housing (12) and the metal housing (11) are stacked on each other. The heat insulation layer (20) is disposed on either side of the composite housing (10) along its own stacking direction for heat insulation of the composite housing (10).

2. The battery pack housing according to claim 1, characterized in that, The thickness of the metal casing (11) is T1, 0.5mm≤T1≤0.7mm; and / or, The thickness of the fiber shell (12) is T2, 0.6 mm ≤ T2 ≤ 1 mm; and / or, The thickness of the insulation layer (20) is T3, 0.35mm≤T3≤0.5mm.

3. The battery pack housing according to claim 1, characterized in that, The metal casing (11) is formed by stamping; and / or, The fiber shell (12) and the metal shell (11) are hot-pressed; and / or, The heat insulation layer (20) is sprayed onto the outer surface of the composite shell (10).

4. The battery pack housing according to claim 1, characterized in that, The metal casing (11) includes an aluminum alloy layer; and / or, The fiber shell (12) includes a carbon fiber shell (12) or a glass fiber shell (12); and / or, The insulation layer (20) includes a polymer layer.

5. The battery pack housing according to claim 1, characterized in that, At least a portion of the outer surface of the fiber shell (12) is provided with a matrix material layer; and / or the fiber shell (12) is filled with a matrix material.

6. The battery pack housing according to claim 1, characterized in that, The composite housing (10) is also provided with mounting holes (101), which are used for external assembly of the battery pack housing.

7. The battery pack housing according to claim 1, characterized in that, The metal shell (11) and the fiber shell (12) have the same structure.

8. The battery pack housing according to any one of claims 1-7, characterized in that, The fiber shell (12) is provided, and the fiber shell (12) is disposed on any side of the metal shell (11) along the stacking direction of the composite shell (10), or, Two fiber shells (12) are provided, and the two fiber shells (12) are respectively disposed on both sides of the metal shell (11) along the stacking direction of the composite shell (10).

9. The battery pack housing according to any one of claims 1-7, characterized in that, One heat insulation layer (20) is provided, and the heat insulation layer (20) is provided on any side of the composite shell (10) along its own stacking direction; or, Two heat insulation layers (20) are provided, and the two heat insulation layers (20) are respectively provided on both sides of the composite shell (10) along its own stacking direction.

10. A battery pack, characterized in that, Includes the battery pack housing as described in any one of claims 1-9.

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