Battery case and battery
By combining carbon fiber reinforced plastic layers and aluminum alloy layers in the battery casing, and setting a honeycomb layer in between, the problems of excessive battery casing weight, low assembly precision, and large temperature difference are solved, achieving lightweighting, improved heat dissipation performance, and extended battery module lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN TOPBAND NEW ENERGY CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-06-05
AI Technical Summary
Existing battery casings are too heavy, have low assembly precision, poor sealing, and large temperature differences between the inside and outside of the battery module, which affect the service life of the battery module.
The design combines a carbon fiber reinforced plastic layer with an aluminum alloy layer, with a honeycomb layer in between to create a heat-conducting space. A honeycomb layer is also placed between the aluminum alloy layer and the carbon fiber reinforced plastic layer to form a continuous heat-conducting interface, thereby enhancing heat dissipation performance.
Significantly reduces battery casing weight, improves casing strength and heat dissipation performance, prevents welding deformation, ensures consistency of batteries within the battery module, and extends service life.
Smart Images
Figure CN224328767U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of batteries, and more particularly to battery casings and batteries. Background Technology
[0002] As a crucial power source, the design of battery pack structures is essential for improving the energy density, safety, and lifespan of battery systems. However, existing batteries still have certain shortcomings in practical use:
[0003] First, although the battery casing is made of aluminum alloy, which has excellent thermal conductivity, the overall weight of aluminum alloy is relatively large, resulting in a relatively large overall weight of the battery.
[0004] Furthermore, the battery casing is prone to deformation during the welding process due to uneven heat distribution, which in turn affects the assembly accuracy and sealing performance of the battery.
[0005] Furthermore, compared to the batteries located inside the battery module, the batteries located at the edge of the battery module have a larger heat exchange area with the outside world. As a result, the battery module is prone to large temperature differences between the inside and outside of the module during operation, which seriously affects the consistency of each battery in the battery module and leads to a shorter battery module lifespan. Utility Model Content
[0006] This utility model provides a battery casing and a battery that can solve the problems of excessive battery weight, low battery assembly accuracy, poor battery sealing, and short battery module lifespan.
[0007] A battery casing comprising:
[0008] A carbon fiber reinforced plastic layer surrounds the battery cell space;
[0009] An aluminum alloy layer, wherein the aluminum alloy layer is sleeved outside the carbon fiber reinforced plastic layer, at least a portion of the aluminum alloy layer is in contact with the carbon fiber reinforced plastic layer, and the remaining portion of the aluminum alloy layer is spaced apart from the carbon fiber reinforced plastic layer to form at least one thermally conductive space; and
[0010] At least one honeycomb layer is provided, and each honeycomb layer is disposed in a corresponding manner within each of the heat-conducting spaces. Each honeycomb layer is in contact with the carbon fiber reinforced plastic layer and the aluminum alloy layer, respectively.
[0011] Preferably, the carbon fiber reinforced plastic layer is hot-pressed to the aluminum alloy layer.
[0012] Preferably, the battery casing includes two of the honeycomb layers;
[0013] Two thermally conductive spaces are provided between the aluminum alloy layer and the carbon fiber reinforced plastic layer. The two thermally conductive spaces are symmetrical to each other relative to the cell space. The two honeycomb layers are arranged one-to-one in the two thermally conductive spaces.
[0014] Preferably, the honeycomb layer includes a plurality of reinforcing ribs, each of which is disposed within the heat-conducting space and surrounds a plurality of honeycomb holes.
[0015] Preferably, the honeycomb holes are hexagonal; or
[0016] The honeycomb holes are square holes; or
[0017] The honeycomb holes are triangular.
[0018] Preferably, the height of the reinforcing rib is 1.5mm to 2.2mm, the thickness of the reinforcing rib is 0.4mm to 1mm, and the length of the reinforcing rib is 6mm to 16mm.
[0019] Preferably, the height of the reinforcing rib is 2mm, the thickness of the reinforcing rib is 0.8mm, and the length of the reinforcing rib is 10mm; or
[0020] The height of the reinforcing rib is 2mm, the thickness of the reinforcing rib is 0.6mm, and the length of the reinforcing rib is 8mm; or
[0021] The height of the reinforcing rib is 2mm, the thickness of the reinforcing rib is 1mm, and the length of the reinforcing rib is 12mm.
[0022] Preferably, the battery casing further includes a heat insulation layer, which is sleeved outside the carbon fiber reinforced plastic layer, and the aluminum alloy layer is sleeved outside the heat insulation layer. The heat-conducting space is located between the heat insulation layer and the aluminum alloy layer, and the heat insulation layer, the carbon fiber reinforced plastic layer and the aluminum alloy layer are thermally pressed together.
[0023] Preferably, the thickness of the aluminum alloy layer is 0.5 mm to 2.2 mm, and the thickness of the carbon fiber reinforced plastic layer is 0.2 mm to 1 mm.
[0024] The second aspect of this utility model also provides a battery, which includes the battery casing described in any of the above technical solutions, and the battery further includes a cell disposed within the cell space.
[0025] The following are the beneficial effects of implementing this utility model:
[0026] This utility model relates to a battery casing and a battery, wherein the battery casing is disposed on the battery. The battery casing is made of an aluminum alloy layer and a carbon fiber reinforced plastic layer, which not only significantly improves the strength of the casing but also greatly reduces the weight compared to existing aluminum casing structures. Furthermore, a honeycomb layer is added between the aluminum alloy layer and the carbon fiber reinforced plastic layer, which allows heat to be quickly transferred from the carbon fiber reinforced plastic layer to the aluminum alloy layer through the honeycomb structure, thereby significantly improving the heat dissipation performance of the battery casing.
[0027] In addition, the honeycomb layer improves the strength and heat dissipation performance of the battery casing, which can prevent the casing from deforming during subsequent welding. On the one hand, the heat from welding can be quickly diffused through the honeycomb structure to avoid excessive local heat accumulation and deformation. On the other hand, the high strength of the battery casing can also prevent deformation of the battery casing during subsequent assembly and welding. Attached Figure Description
[0028] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.
[0029] Figure 1 This is a schematic diagram of the battery casing structure in some embodiments of this utility model;
[0030] Figure 2 yes Figure 1 The exploded view of the battery casing is shown.
[0031] Figure 3 yes Figure 1 The diagram shows the internal structure of the battery casing.
[0032] Figure 4 yes Figure 3 Enlarged view at point A;
[0033] Figure 5 This is a schematic diagram of the honeycomb layer structure in some embodiments of this utility model;
[0034] Figure 6 This is a schematic diagram of the battery structure in some embodiments of this utility model. Detailed Implementation
[0035] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.
[0036] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0037] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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. Therefore, they should not be construed as limitations on this utility model.
[0038] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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 according to the specific circumstances.
[0039] Figure 1 and Figure 2 The diagram illustrates a battery housing 10 in some embodiments of the present invention, which can be applied to various types of batteries. For example, the battery housing 10 can be applied to lithium batteries, dry cell batteries, nickel-based batteries, or other types of batteries.
[0040] like Figures 1 to 4 As shown, the battery casing 10 includes a carbon fiber reinforced plastic layer 1, an aluminum alloy layer 2, and at least one honeycomb layer 3. The carbon fiber reinforced plastic layer 1 encloses the cell space 11. The aluminum alloy layer 2 is sleeved on the carbon fiber reinforced plastic layer 1, with at least a portion of the aluminum alloy layer 2 adhering to the carbon fiber reinforced plastic layer 1, and the remaining portion of the aluminum alloy layer 2 spaced apart from the carbon fiber reinforced plastic layer 1 to form at least one heat-conducting space 4. Each honeycomb layer 3 is correspondingly disposed within each heat-conducting space 4, and each honeycomb layer 3 is in contact with both the carbon fiber reinforced plastic layer 1 and the aluminum alloy layer 2.
[0041] Understandably, the inner wall of the carbon fiber reinforced plastic layer 1 directly contacts the battery cell and provides insulation protection. The portion of the carbon fiber reinforced plastic layer 1 that is bonded to the aluminum alloy layer 2 is rigidly connected to achieve reinforcement and limit deformation. The remaining portion of the carbon fiber reinforced plastic layer 1 transfers heat and absorbs local stress through contact with the honeycomb layer 3.
[0042] An aluminum alloy layer 2 is fitted on the outside of the carbon fiber reinforced plastic layer 1. Part of the aluminum alloy layer 2 is fixed to the carbon fiber reinforced plastic layer 1 to ensure the integrity of the battery casing. The remaining part of the aluminum alloy layer 2 and the carbon fiber reinforced plastic layer 1 form a thermally conductive space 4 to provide a channel for heat transfer.
[0043] The honeycomb layer 3 is in physical contact with the carbon fiber reinforced plastic layer 1 and the aluminum alloy layer 2, forming a continuous thermally conductive interface. At the same time, the honeycomb structure of the honeycomb layer 3 can also provide a certain degree of resistance to deformation, that is, while improving the thermal conductivity, it can also reinforce the battery casing 10.
[0044] It should be noted that the combination of the high specific strength of the carbon fiber reinforced plastic layer 1 and the lightweight properties of the honeycomb layer 3 results in a battery casing 10 that is significantly lighter than the all-aluminum or all-aluminum alloy structures of existing battery casings while maintaining the same strength. The honeycomb layer 3 expands the heat dissipation surface area and provides directional heat conduction paths, efficiently transferring heat from inside the battery to the outer surface of the aluminum alloy layer 2, thus preventing heat accumulation.
[0045] Specifically, in some embodiments, the aluminum alloy layer 2 may be configured as 6061 aluminum alloy.
[0046] like Figure 2 and Figure 3 As shown, in some embodiments of the battery casing 10, the carbon fiber reinforced plastic layer 1 is heat-pressed together with the aluminum alloy layer 2.
[0047] Understandably, hot-press bonding eliminates the need for adhesives, reducing costs. Furthermore, hot-press bonding ensures a tighter contact between the carbon fiber reinforced plastic layer 1 and the aluminum alloy layer 2, minimizing gaps at the intended bonding points and improving thermal conductivity.
[0048] It should be noted that in the actual production process, carbon fiber reinforced plastic and aluminum alloy can be cut and shaped according to the production requirements. Then, the cut carbon fiber reinforced plastic and aluminum alloy are placed in a hot press mold, and then hot press processing is performed using the hot press mold under a predetermined temperature and pressure, so that the predetermined parts of the aluminum alloy and carbon fiber reinforced plastic are hot-pressed together to achieve a tight bond. Subsequently, the honeycomb layer 3 is welded and installed in the heat-conducting space 4 reserved during the hot pressing process. Specifically, the honeycomb layer 3 is welded to the inner sidewall of the aluminum alloy layer 2.
[0049] like Figure 2 As shown, in some embodiments of the battery casing 10, the battery casing includes two honeycomb layers 3. Two heat-conducting spaces 4 are provided between the aluminum alloy layer 2 and the carbon fiber reinforced plastic layer 1. The two heat-conducting spaces 4 are symmetrical to each other relative to the cell space 11, and the two honeycomb layers 3 are disposed one-to-one in the two heat-conducting spaces 4.
[0050] Understandably, two symmetrical heat-conducting spaces 4 are formed between the aluminum alloy layer 2 and the carbon fiber reinforced plastic layer 1, and the axis of symmetry of the two heat-conducting spaces 4 coincides with the center line of the cell space 11. Each heat-conducting space 4 is provided with an independent honeycomb layer 3, so that the heat inside the battery can flow out symmetrically and quickly, further improving the heat dissipation effect.
[0051] Furthermore, it should be noted that the symmetrical arrangement of the two heat-conducting spaces 4 will make it more convenient for the aluminum alloy layer 2 and the carbon fiber reinforced plastic layer 1 to be processed in the mold hot pressing process, eliminating the tedious process of aligning the materials before hot pressing, improving the processing and production efficiency of the product, and reducing the risk of mold misalignment.
[0052] like Figure 2 and Figure 5 As shown, in some embodiments of the battery housing 10, the honeycomb layer 3 includes a plurality of reinforcing ribs 31, each reinforcing rib 31 being disposed within the heat-conducting space 4, and each reinforcing rib 31 surrounding a plurality of honeycomb holes 32.
[0053] Understandably, each reinforcing rib 31 can be configured to be integrally molded to avoid structural looseness caused by secondary assembly, thereby ensuring heat dissipation. The cross-section of the reinforcing rib 31 can be flexibly set; for example, the cross-section of the reinforcing rib 31 can be configured as T-shaped, I-shaped, or rectangular.
[0054] It should be noted that the reinforcing rib 31 can be made of aluminum alloy. Specifically, the reinforcing rib 31 can be made of 6061 aluminum alloy.
[0055] like Figure 5 As shown, the pore shape of the honeycomb pore 32 can be implemented in at least the following ways:
[0056] Firstly, the honeycomb holes 32 can be configured as hexagonal holes. Understandably, the included angle of the hole walls of a hexagonal hole is 120°, which has the advantages of high compressive strength, excellent thermal conductivity, and high material utilization.
[0057] Secondly, the honeycomb cells 32 can be configured as square cells. Understandably, the included angle of the cell walls of a square cell is 90°. The outline size of each square cell can be flexibly set, and square cells of different diameters can be used to form a honeycomb layer. This allows for gradient diameter design of each square cell according to design requirements, such as denser at the edges and sparser at the center, or vice versa.
[0058] Thirdly, the honeycomb holes 32 can be configured as triangular holes. Understandably, the included angle of the hole walls of a triangular hole is 60°, which has higher structural stability and improves the rigidity and shock resistance of the battery casing.
[0059] In addition to the above, the density of the honeycomb holes 32 can be flexibly set regardless of the shape of the holes.
[0060] like Figure 5 As shown, specifically in some embodiments of the battery casing 10, the height H3 of the reinforcing rib 31 is 1.5mm to 2.2mm, the thickness D3 of the reinforcing rib 31 is 0.4mm to 1mm, and the length L3 of the reinforcing rib 31 is 6mm to 16mm.
[0061] Understandably, setting the reinforcing rib 31 according to the data in this embodiment can ensure the strength of the reinforcing rib 31 and the thermal conductivity of the honeycomb layer. Of course, the length, height, and thickness of the reinforcing rib 31 are not limited to the range given in this embodiment. In actual production and processing, the specifications of the reinforcing rib 31 can be flexibly set according to the design and usage requirements.
[0062] In some embodiments of the battery casing 10, the height H3 of the reinforcing rib 31 is 2 mm, the thickness D3 of the reinforcing rib 31 is 0.8 mm, and the length L3 of the reinforcing rib 31 is 10 mm.
[0063] Specifically, in some embodiments of the battery casing 10, the height H3 of the reinforcing rib 31 is 2mm, the thickness D3 of the reinforcing rib 31 is 0.6mm, and the length L3 of the reinforcing rib 31 is 8mm.
[0064] Specifically, in some embodiments of the battery casing 10, the height H3 of the reinforcing rib 31 is 2mm, the thickness D3 of the reinforcing rib 31 is 1mm, and the length L3 of the reinforcing rib 31 is 12mm.
[0065] In addition to the above, regardless of the shape and specifications of the reinforcing rib 31, the density of the reinforcing rib 31 can be flexibly set according to the actual production and use requirements, and there is no limitation here.
[0066] In some embodiments of the battery housing 10, the battery housing further includes a heat insulation layer, which is sleeved on the carbon fiber reinforced plastic layer 1, and an aluminum alloy layer 2 is sleeved on the heat insulation layer. A heat conduction space 4 is located between the heat insulation layer and the aluminum alloy layer 2. The heat insulation layer, the carbon fiber reinforced plastic layer 1, and the aluminum alloy layer 2 are thermally pressed together.
[0067] Understandably, the heat insulation layer improves the heat insulation performance of the casing and prevents heat transfer between batteries. In actual production, the heat insulation material, carbon fiber reinforced plastic layer material, and aluminum alloy material can be cut into predetermined sizes. The cut materials are then placed in a hot press mold and hot-pressed together under predetermined temperature and pressure conditions, thus tightly bonding the predetermined portions of the three materials and forming a heat-conducting space 4 between the heat insulation layer and the aluminum alloy layer 2. Subsequently, the honeycomb layer is placed within the heat-conducting space 4 and welded to the aluminum alloy layer 2 to obtain the desired battery casing 10.
[0068] Specifically, the insulation layer can be configured as a mica layer or a ceramic layer; of course, other materials with heat insulation properties in the prior art can also be used to make the insulation layer.
[0069] like Figure 4 As shown, specifically, in some embodiments of the battery casing 10, the thickness D2 of the aluminum alloy layer 2 is 0.5mm to 2.2mm, and the thickness D1 of the carbon fiber reinforced plastic layer 1 is 0.2mm to 1mm. It can be understood that by adopting the content of this embodiment, the strength of the battery casing 10 can be guaranteed while minimizing the weight of the battery casing, thereby improving the product's lightweight design and resistance to deformation.
[0070] Figure 6 The present invention illustrates a battery 30 in some embodiments, the battery 30 comprising a battery casing 10 and a battery cell 20 (the battery casing 10 is also shown in...). Figures 1 to 5 The battery cells are located within the battery cell space 11.
[0071] Understandably, the battery includes, but is not limited to, lithium batteries, dry cell batteries, nickel-based batteries or other types of batteries in the prior art, as long as the battery casing 10 of this utility model can be used.
[0072] The following are the beneficial effects of implementing this utility model:
[0073] This utility model relates to a battery casing and a battery, wherein the battery casing is disposed on the battery. The battery casing is made of an aluminum alloy layer and a carbon fiber reinforced plastic layer, which not only significantly improves the strength of the casing but also greatly reduces the weight compared to existing aluminum casing structures. Furthermore, a honeycomb layer is added between the aluminum alloy layer and the carbon fiber reinforced plastic layer, which allows heat to be quickly transferred from the carbon fiber reinforced plastic layer to the aluminum alloy layer through the honeycomb structure, thereby significantly improving the heat dissipation performance of the battery casing.
[0074] In addition, the honeycomb layer improves the strength and heat dissipation performance of the battery casing, which can prevent the casing from deforming during subsequent welding. On the one hand, the heat from welding can be quickly diffused through the honeycomb structure to avoid excessive local heat accumulation and deformation. On the other hand, the high strength of the battery casing can also prevent deformation of the battery casing during subsequent assembly and welding.
[0075] The present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to the present invention. Furthermore, it is understood that the steps in the method of the present invention embodiments can be adjusted, combined, and deleted according to actual needs, and the modules in the device of the present invention embodiments can be combined, divided, and deleted according to actual needs.
[0076] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A battery casing, characterized in that, include: A carbon fiber reinforced plastic layer (1) surrounds the cell space (11); An aluminum alloy layer (2) is sleeved outside the carbon fiber reinforced plastic layer (1), at least a portion of the aluminum alloy layer (2) is attached to the carbon fiber reinforced plastic layer (1), and the remaining portion of the aluminum alloy layer (2) is spaced apart from the carbon fiber reinforced plastic layer (1) to form at least one thermally conductive space (4); and At least one honeycomb layer (3) is provided in each of the heat-conducting spaces (4), and each honeycomb layer (3) is in contact with the carbon fiber reinforced plastic layer (1) and the aluminum alloy layer (2).
2. The battery casing according to claim 1, characterized in that, The carbon fiber reinforced plastic layer (1) is hot-pressed together with the aluminum alloy layer (2).
3. The battery casing according to claim 1 or 2, characterized in that, The battery casing includes two of the honeycomb layers (3); Two thermally conductive spaces (4) are provided between the aluminum alloy layer (2) and the carbon fiber reinforced plastic layer (1). The two thermally conductive spaces (4) are symmetrical to each other relative to the cell space (11). The two honeycomb layers (3) are arranged one-to-one in the two thermally conductive spaces (4).
4. The battery casing according to claim 1, characterized in that, The honeycomb layer (3) includes a plurality of reinforcing ribs (31), each of which is disposed within the heat-conducting space (4), and each of which surrounds a plurality of honeycomb holes (32).
5. The battery casing according to claim 4, characterized in that, The honeycomb holes (32) are hexagonal holes; or The honeycomb holes (32) are square holes; or The honeycomb holes (32) are triangular holes.
6. The battery casing according to claim 4 or 5, characterized in that, The height of the reinforcing rib (31) is 1.5mm to 2.2mm, the thickness of the reinforcing rib (31) is 0.4mm to 1mm, and the length of the reinforcing rib (31) is 6mm to 16mm.
7. The battery casing according to claim 6, characterized in that, The height of the reinforcing rib (31) is 2 mm, the thickness of the reinforcing rib (31) is 0.8 mm, and the length of the reinforcing rib (31) is 10 mm; or The height of the reinforcing rib (31) is 2 mm, the thickness of the reinforcing rib (31) is 0.6 mm, and the length of the reinforcing rib (31) is 8 mm; or The height of the reinforcing rib (31) is 2mm, the thickness of the reinforcing rib (31) is 1mm, and the length of the reinforcing rib (31) is 12mm.
8. The battery casing according to claim 1, characterized in that, The battery casing also includes a heat insulation layer, which is sleeved on the carbon fiber reinforced plastic layer (1), and the aluminum alloy layer (2) is sleeved on the heat insulation layer. The heat conduction space (4) is located between the heat insulation layer and the aluminum alloy layer (2). The heat insulation layer, the carbon fiber reinforced plastic layer (1) and the aluminum alloy layer (2) are heat-pressed together.
9. The battery casing according to claim 1 or 8, characterized in that, The thickness of the aluminum alloy layer (2) is 0.5 mm to 2.2 mm, and the thickness of the carbon fiber reinforced plastic layer (1) is 0.2 mm to 1 mm.
10. A battery, characterized in that, The battery includes a battery casing as described in any one of claims 1 to 9, and the battery further includes a cell disposed within the cell space (11).