A power battery pack protective shell

Abstract

The utility model provides a kind of power battery pack protective shell, it is related to battery pack shell technical field, comprising: lower shell, the lower shell inner wall bottom end is fixedly connected with limiting block, the limiting block both sides outer wall are fixedly connected with a first fixed block, the first fixed block upper end outer wall is fixedly connected with connecting rod, the limiting block inner wall one side is movably connected with battery body, the battery body upper end is movably connected with protective shell, the protective shell both sides outer wall are fixedly connected with a second fixed block, the second fixed block inner wall one side is fixedly connected with connecting mechanism. The utility model solves the existing battery pack using thread fastening or welding process, when battery replacement needs to use special tool to disassemble a large number of fasteners, time-consuming is as long as several hours, seriously affects maintenance efficiency, and the problem that shell material process leads to the decline of protective performance.

Description

Technical Field

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

[0002] In new energy power systems, the protective casing of the power battery pack is a key component ensuring the safe operation of the battery. This device, through optimized structural design and material processes, provides physical protection, environmental isolation, and convenient maintenance support for the battery, and is widely used in electric vehicles, energy storage power stations, and other fields. Its core functions are to resist external impacts, prevent liquid or dust intrusion, and enable rapid battery replacement through modular design, significantly improving the reliability and operational efficiency of the energy system.

[0003] Current technology for protective casings of power battery packs suffers from multiple shortcomings. Traditional designs often employ threaded fastenings or welding, requiring specialized tools to disassemble numerous fasteners during battery replacement, a process that can take several hours and severely impacts maintenance efficiency. Some products use plug-in connections to simplify the structure, but these connections lack sufficient strength, making batteries prone to loosening or even detachment under vibration. Regarding materials and manufacturing processes, traditional multi-layer composite casings rely on adhesives or mechanical riveting, which are susceptible to interlayer peeling or deformation after prolonged use, leading to a decline in protective performance. Furthermore, existing casings often use a single rubber ring design for sealing, which is ill-suited to handling stress changes caused by battery thermal expansion and contraction. This can result in seal failure under extreme temperature conditions, potentially causing battery short circuits or corrosion risks. These technological bottlenecks restrict the application expansion of new energy equipment in high-reliability scenarios. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a protective casing for power battery packs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a protective shell for a power battery pack, comprising: a lower shell, wherein a limiting block is fixedly connected to the bottom end of the inner wall of the lower shell, a first fixing block is fixedly connected to each of the two outer walls of the limiting block, a connecting rod is fixedly connected to the upper outer wall of the first fixing block, a battery body is movably connected to one side of the inner wall of the limiting block, a protective shell is movably connected to the upper end of the battery body, a second fixing block is fixedly connected to each of the two outer walls of the protective shell, and a connecting mechanism is fixedly connected to one side of the inner wall of the second fixing block; The connecting mechanism includes a mounting block fixedly connected to one side of the inner wall of the second fixed block, a connecting block fixedly connected to the bottom end of the inner wall of the mounting block, a spring piece fixedly connected to the upper end of the connecting block, a threaded groove on one side of the upper end of the inner wall of the mounting block, a movable block movably connected to the outer wall of the upper end of the mounting block, a connecting thread on one side of the lower end of the movable block, and a connecting groove on the bottom end of the inner wall of the movable block.

[0006] In a preferred embodiment, the lower housing includes an inner layer, a buffer layer is fixedly connected to one side of the outer wall of the inner layer, a filling layer is fixedly connected to the outer wall of the buffer layer away from the inner layer, an outer layer is fixedly connected to the outer wall of the filling layer away from the buffer layer, and an upper housing is movably connected to the upper end of the lower housing.

[0007] In a preferred embodiment, the inner layer is made of thermally conductive plastic, such as polyimide (PI) or polyethylene terephthalate (PET), the buffer layer adopts a biomimetic honeycomb structure and is made of high-density polyurethane foam, the filling layer is made of phase change material, and the outer layer is made of high-strength aluminum alloy.

[0008] In a preferred embodiment, the inner layer, buffer layer, filling layer and outer layer are manufactured using a hot-pressing composite process.

[0009] In a preferred embodiment, the upper outer wall of the connecting block has four spring pieces arranged in a ring, and the upper outer walls of the four spring pieces are connected to the connecting grooves opened at the lower end of the inner wall of the movable block.

[0010] In a preferred embodiment, the connecting thread on the lower outer wall of the movable block is threadedly connected to the threaded groove on the upper inner wall of the mounting block.

[0011] In one preferred embodiment, the connecting rod on the upper outer wall of the first fixing block is connected to the inner wall of the connecting mechanism.

[0012] In a preferred embodiment, the protective shell and the limiting block are movably connected to the connecting mechanism via a connecting rod.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. This utility model, through its modular design, allows for quick disassembly and replacement of the battery body without additional tools. This design effectively avoids the problem of traditional threaded connections requiring additional tools and wasting considerable time, thus improving maintenance efficiency. The connecting mechanism, through the cooperation of the movable block and the mounting block, utilizes the elastic design of the spring plate to quickly fix or loosen the battery body. When the movable block is rotated, the connecting groove acts on the spring plate, causing the spring plate to bend and fix the battery body, thereby facilitating battery replacement. Conversely, the battery body can be easily disassembled after loosening.

[0014] 2. In use, this utility model is designed with a hot-press composite manufacturing process. Through this process, the inner layer, buffer layer, filling layer and outer layer are tightly bonded together, ensuring a reliable connection between the layers and avoiding loosening or deformation caused by long-term use, thus further making the shell have reliable protection.

[0015] 3. In use, the protective shell, through the cooperation of the first fixing block, connecting rod, connecting mechanism, and limiting block, ensures that the battery body is effectively fixed during use. This design avoids potential safety hazards caused by loosening of the battery during transportation or use. Through the interaction between the movable block and the spring piece, the protective shell can be firmly connected to the limiting block, ensuring that the battery body will not shift due to external forces during operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of a protective shell for a power battery pack provided by this utility model.

[0017] Figure 2 This is a disassembly diagram of a protective shell for a power battery pack provided by this utility model.

[0018] Figure 3 This is a schematic diagram of the internal disassembly structure of a protective shell for a power battery pack provided by this utility model.

[0019] Figure 4 This is a cross-sectional disassembly diagram of the lower shell of a power battery pack protective shell provided by this utility model.

[0020] Figure 5 This is a cross-sectional disassembly diagram of the connection mechanism of a power battery pack protective shell provided by this utility model.

[0021] Legend: 1. Lower housing; 2. Upper housing; 3. Limiting block; 4. First fixing block; 5. Connecting rod; 6. Battery body; 7. Second fixing block; 8. Connecting mechanism; 9. Protective shell; 12. Inner layer; 13. Buffer layer; 14. Filling layer; 15. Outer layer; 81. Mounting block; 82. Connecting block; 83. Spring; 84. Threaded groove; 85. Movable block; 86. Connecting thread; 87. Connecting groove. Detailed Implementation

[0022] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0023] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0024] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; 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. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected through a transitional structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0026] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Example

[0027] like Figure 1-5As shown, this utility model provides a technical solution: a protective shell for a power battery pack, comprising: a lower shell 1, a limiting block 3 fixedly connected to the bottom of the inner wall of the lower shell 1, a first fixing block 4 fixedly connected to each of the two outer walls of the limiting block 3, a connecting rod 5 fixedly connected to the upper outer wall of the first fixing block 4, a battery body 6 movably connected to one side of the inner wall of the limiting block 3, a protective shell 9 movably connected to the upper end of the battery body 6, a second fixing block 7 fixedly connected to each of the two outer walls of the protective shell 9, a connecting mechanism 8 fixedly connected to one side of the inner wall of the second fixing block 7, the connecting rod 5 provided on the upper outer wall of the first fixing block 4 correspondingly connected to the inner wall of the connecting mechanism 8, and the protective shell 9 and the limiting block 3 movably connected to the connecting mechanism 8 through the connecting rod 5; The connecting mechanism 8 includes a mounting block 81 fixedly connected to one side of the inner wall of the second fixing block 7. A connecting block 82 is fixedly connected to the bottom of the inner wall of the mounting block 81. A spring piece 83 is fixedly connected to the upper end of the connecting block 82. A threaded groove 84 is opened on one side of the upper end of the inner wall of the mounting block 81. A movable block 85 is movably connected to the outer wall of the upper end of the mounting block 81. A connecting thread 86 is provided on the outer wall of the lower end of the movable block 85. The connecting thread 86 on the outer wall of the lower end of the movable block 85 is threadedly connected to the threaded groove 84 opened on the upper end of the inner wall of the mounting block 81. A connecting groove 87 is opened at the bottom of the inner wall of the movable block 85. Four spring pieces 83 are arranged in a ring on the outer wall of the upper end of the connecting block 82, and the outer walls of the upper ends of the four spring pieces 83 are correspondingly connected to the connecting groove 87 opened at the lower end of the inner wall of the movable block 85.

[0028] In this embodiment, a lower housing 1 is designed, with a limiting block 3 fixedly connected to the bottom of the inner wall of the lower housing 1. A first fixing block 4 is fixedly connected to one side of the limiting block 3, and a connecting rod 5 is fixedly connected to the outer wall of the upper side of the first fixing block 4. A battery body 6 is provided on one side of the inner wall of the limiting block 3. A protective shell 9 is movably connected to the upper end of the battery body 6, and a second fixing block 7 is fixedly connected to the outer wall of the protective shell 9. A connecting mechanism 8 is fixedly connected to one side of the inner wall of the second fixing block 7. The protective shell 9 and the limiting block 3 are movably connected to the connecting mechanism 8 through the first fixing block 4. This provides a limiting connection for the battery body 6. The modular design allows for quick disassembly and replacement of the battery body 6, avoiding the need for additional tools and time-consuming repairs required by existing threaded connections. The specific connecting mechanism 8 includes... Mounting block 81 has four spring pieces 83 fixedly connected to its inner wall via connecting block 82. The spring pieces 83 are elastic and tilted in all directions. A movable block 85 is connected to the upper end of mounting block 81. The lower outer wall of movable block 85 is provided with connecting thread 86, which can be threadedly connected to the threaded groove 84 opened at the upper end of the inner wall of mounting block 81. Therefore, when movable block 85 is rotated, movable block 85 will move downward on the inner wall of mounting block 81. At this time, the connecting groove 87 opened at the lower end of movable block 85 will act on the upper end of spring piece 83. At this time, spring piece 83 bends and converges towards the center. At this time, the connecting rod 5 provided at the upper end of the first fixing block 4 passes through the connecting mechanism 8 and is clamped by spring piece 83. This allows the limiting block 3 to be fixed to the protective shell 9. Conversely, they can be separated, thus enabling quick disassembly and replacement of the battery body 6. Example

[0029] like Figure 1-4 As shown, the lower shell 1 includes an inner layer 11, a buffer layer 12 is fixedly connected to one side of the outer wall of the inner layer 11, a filling layer 13 is fixedly connected to the outer wall of the buffer layer 12 away from the inner layer 11, and an outer layer 14 is fixedly connected to the outer wall of the filling layer 13 away from the buffer layer 12. The inner layer 11 is made of thermally conductive plastic, such as polyimide (PI) or polyethylene terephthalate (PET). The buffer layer 12 adopts a biomimetic honeycomb structure and is made of high-density polyurethane foam. The filling layer 13 is made of phase change material. The outer layer 14 is made of high-strength aluminum alloy. The inner layer 11, the buffer layer 12, the filling layer 13 and the outer layer 14 are made of hot-pressed composite material. The upper shell 2 is movably connected to the upper end of the lower shell 1.

[0030] In this embodiment, the lower housing 1 is provided with an inner layer 11, which is made of thermally conductive plastics such as polyimide and polyethylene terephthalate. These materials are not only resistant to high temperatures but also have a certain degree of electrical conductivity, making them suitable for battery protection in high-temperature environments. The buffer layer 12 is made of high-density polyurethane foam with a honeycomb structure, which has good cushioning performance and can effectively absorb impact forces. At the same time, the material is lightweight and will not put extra burden on the battery pack. The filling layer 13 is made of phase change material, which can absorb heat when the battery temperature rises and release heat when the temperature drops, helping to stabilize the battery pack temperature. Common phase change materials include paraffin wax and inorganic salt hydrates. The outer layer 14 is made of high-strength aluminum alloy, which can provide strength support for the outer shell and also has good corrosion resistance, making it suitable for long-term use. The inner layer 11, buffer layer 12, filling layer 13, and outer layer 14 are manufactured using a hot-pressing composite process, which allows the different layers of the lower housing 1 to be connected using hot-pressing composite technology, ensuring a tight bond between the materials and preventing loosening or deformation due to long-term use.

[0031] Working principle: like Figure 1-5 As shown, the device employs a modular design, aiming to provide quick disassembly and replacement of the battery body 6 to improve maintenance efficiency and simplify operation. The lower housing 1 incorporates multiple functional layers, employing a series of connection and limiting mechanisms to ensure the battery's safety and stability under high temperature and vibration conditions.

[0032] A limiting block 3 is installed at the bottom of the inner wall of the lower housing 1, and the limiting block 3 is fixedly connected to the first fixing block 4. A connecting rod 5 is also connected to the upper outer wall of the first fixing block 4 to further ensure the stability of the connection. The battery body 6 is installed on one side of the inner wall of the limiting block 3, and the upper end of the battery body 6 is movably connected to the protective shell 9. The outer wall of the protective shell 9 is fixed with a second fixing block 7, and a connecting mechanism 8 is installed on one side of the inner wall of the second fixing block 7. The protective shell 9 and the limiting block 3 are movably connected to the first fixing block 4 and the connecting mechanism 8, forming a connection method that can be quickly disassembled and replaced.

[0033] The connecting mechanism 8 consists of a mounting block 81, spring pieces 83, and a movable block 85. Four inclined, elastic spring pieces 83 are fixed to the inner wall of the mounting block 81 via a connecting block 82. The upper end of the movable block 85 is connected to the mounting block 81, and its lower outer wall has a connecting thread 86, which can be threaded into the threaded groove 84 on the inner wall of the mounting block 81. When the movable block 85 is rotated, the connecting groove 87 at its lower end applies pressure to the spring pieces 83, causing them to bend and converge towards the center, thus firmly clamping the battery body 6. Simultaneously, the connecting rod 5 passes through the connecting mechanism 8 and is clamped by the spring pieces 83, ultimately fixing the limiting block 3 to the protective shell 9. When the movable block 85 is rotated in the opposite direction, the spring pieces 83 return to their original state, separating the battery body 6 from the connecting mechanism 8, thus facilitating battery disassembly and replacement, and improving the maintainability and ease of use of the structure.

[0034] To enhance the safety and stability of the battery system, the lower casing 1 adopts a layered structure. The inner layer 11 is made of thermally conductive plastic, featuring high temperature resistance and good electrical conductivity, making it suitable for protecting the battery in high-temperature environments. The buffer layer 12 uses high-density polyurethane foam with a honeycomb structure, effectively absorbing external impacts while remaining lightweight and not increasing the burden on the battery. The filling layer 13 uses phase change materials, such as paraffin or inorganic salt hydrates, which absorb heat when the battery temperature rises and release heat when the temperature drops, thereby helping to regulate the battery temperature and maintain a stable operating state. The outer layer 14 is made of high-strength aluminum alloy, possessing excellent corrosion resistance and strength, suitable for long-term use.

[0035] These material layers are joined using a hot-pressing composite technology, ensuring a tight bond between each layer and preventing loosening or deformation due to prolonged use. This composite structure not only enhances the mechanical strength and durability of the battery casing but also guarantees its stability and safety in complex environments. Through this modular design and the application of composite materials, the device achieves efficient and reliable battery protection and simplifies maintenance.

[0036] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0037] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A protective casing for a power battery pack, comprising a lower casing (1), characterized in that: The bottom of the inner wall of the lower housing (1) is fixedly connected to a limiting block (3). A first fixing block (4) is fixedly connected to both outer walls of the limiting block (3). A connecting rod (5) is fixedly connected to the upper outer wall of the first fixing block (4). A battery body (6) is movably connected to one side of the inner wall of the limiting block (3). A protective shell (9) is movably connected to the upper end of the battery body (6). A second fixing block (7) is fixedly connected to both outer walls of the protective shell (9). A connecting mechanism (8) is fixedly connected to one side of the inner wall of the second fixing block (7). The connecting mechanism (8) includes a mounting block (81) fixedly connected to one side of the inner wall of the second fixed block (7). A connecting block (82) is fixedly connected to the bottom of the inner wall of the mounting block (81). A spring piece (83) is fixedly connected to the upper end of the connecting block (82). A threaded groove (84) is opened on one side of the upper end of the inner wall of the mounting block (81). A movable block (85) is movably connected to the outer wall of the upper end of the mounting block (81). A connecting thread (86) is provided on the outer wall of one side of the lower end of the movable block (85). A connecting groove (87) is opened at the bottom of the inner wall of the movable block (85).

2. The protective casing for a power battery pack according to claim 1, characterized in that: The lower shell (1) includes an inner layer (11), a buffer layer (12) is fixedly connected to one side of the outer wall of the inner layer (11), a filling layer (13) is fixedly connected to the outer wall of the buffer layer (12) away from the inner layer (11), an outer layer (14) is fixedly connected to the outer wall of the filling layer (13) away from the buffer layer (12), and an upper shell (2) is movably connected to the upper end of the lower shell (1).

3. The protective casing for a power battery pack according to claim 2, characterized in that: The inner layer (11) is made of thermally conductive plastic, the buffer layer (12) is made of biomimetic honeycomb structure and high-density polyurethane foam, the filling layer (13) is made of phase change material, and the outer layer (14) is made of high-strength aluminum alloy.

4. The protective casing for a power battery pack according to claim 2, characterized in that: The inner layer (11), buffer layer (12), filling layer (13) and outer layer (14) are made using a hot-pressing composite process.

5. A protective casing for a power battery pack according to claim 1, characterized in that: The upper outer wall of the connecting block (82) has four spring pieces (83) arranged in a ring, and the upper outer wall of the four spring pieces (83) is connected to the connecting groove (87) opened at the lower end of the inner wall of the movable block (85).

6. The protective casing for a power battery pack according to claim 1, characterized in that: The connecting thread (86) on the lower outer wall of the movable block (85) is threadedly connected to the threaded groove (84) on the upper inner wall of the mounting block (81).

7. A protective casing for a power battery pack according to claim 1, characterized in that: The connecting rod (5) on the upper outer wall of the first fixing block (4) is connected to the inner wall of the connecting mechanism (8).

8. The protective casing for a power battery pack according to claim 1, characterized in that: The protective shell (9) and the limiting block (3) are movably connected to the connecting mechanism (8) via the connecting rod (5).

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