Battery pack and electric device

Abstract

The embodiment of the utility model provides a battery pack and a power utilization device, the battery pack comprises a box body, a cover plate and a battery cell, the box body is provided with a containing cavity, the containing cavity is provided with an opening, the battery cell is arranged in the containing cavity, and the cover plate is connected to the box body to block the opening; the cover plate comprises a main body part and a convex hull part, the convex hull part is connected to the main body part and protrudes from the main body part to one side far away from the battery cell, the convex hull part comprises a main body part and a first thickening part, and the main body part is connected with the main body part through the first thickening part. In the embodiment of the invention, the stress value of the first thickening part is relatively small, the wear resistance of the area is improved, the connection strength between the convex hull part and the body part is ensured, and the structural strength of the cover plate is improved, so that the service life of the electric cover plate is prolonged, and the protection effect of the cover plate on structures such as an internal battery cell and a battery pack management system is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery pack and a power utilization device. BACKGROUND

[0002] The battery pack cover plate serves as a protective piece at the top of the battery pack, can bear the upper structure upward, and can separate the battery cell from the upper structure downward to play a heat insulation and insulation role.

[0003] In the related art, a convex part is arranged on the battery pack cover plate to accommodate a battery pack management system, so as to provide more layout space for the battery cell. However, it is found in actual application that the existence of the convex part is easy to cause stress concentration of the battery pack cover plate, and even cause damage of the battery pack cover plate, affect the protection of the internal structure of the battery pack, and shorten the overall service life of the battery pack. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a battery pack and a power utilization device to solve the problems of stress concentration and shaking abnormal sound of the battery pack cover plate.

[0005] In order to solve the above technical problems, the application is implemented as follows:

[0006] In a first aspect, the application discloses a battery pack, comprising a box body, a cover plate and a battery cell, the box body has a containing cavity, the containing cavity has an opening, the battery cell is arranged in the containing cavity, and the cover plate is connected to the box body to block the opening.

[0007] The cover plate comprises a main body part and a convex part, the convex part is connected to the main body part and protrudes from the main body part to a side away from the battery cell, the convex part comprises a body part and a first thickening part, and the body part is connected to the main body part through the first thickening part.

[0008] Optionally, the convex part has a plurality of corners, the plurality of corners include a plurality of top corners away from the main body part and a plurality of bottom corners connected to the main body part, the first thickening part is arranged in at least one preset area with the top corner as the center, and / or the first thickening part is arranged in at least one preset area with the bottom corner as the center.

[0009] Optionally, the convex part further comprises a second thickening part, and the second thickening part is connected between at least two first thickening parts.

[0010] Optionally, the first thickening part protrudes and extends from the body part to a side away from the battery cell.

[0011] Optionally, the first thickening part protrudes and extends from the body part to a side close to the battery cell.

[0012] Optionally, the thickness of the first thickened portion decreases from the center to the edge.

[0013] Optionally, the cover plate is non-metallic, and the body portion, the first thickened portion, and the main body portion are integrally formed.

[0014] Optionally, the cover plate includes a structural layer and a fireproof layer disposed along the thickness direction, the fireproof layer being disposed close to the battery cell, wherein both the structural layer and the fireproof layer are non-metallic layers.

[0015] Optionally, the structural layer includes a glass fiber reinforced resin composite layer, and the fireproof layer includes a ceramic silicone rubber layer.

[0016] Optionally, the main body is provided with a raised area, which protrudes from the main body in a direction away from the battery cell.

[0017] Secondly, this application discloses an electrical device including the aforementioned battery pack.

[0018] In this embodiment, by providing a first thickened portion on the convex portion of the cover plate, and connecting the main body of the convex portion and the main body of the cover plate through the first thickened portion, the stress value at the location of the first thickened portion is small, which improves the wear resistance of the area, while ensuring the connection strength between the convex portion and the main body, improving the structural strength of the cover plate, extending the service life of the cover plate, and ensuring the protective function of the cover plate for internal structures such as battery cells and battery pack management systems.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the structure of a cover plate in the prior art;

[0022] Figure 2 This is a top view of a cover plate in the prior art;

[0023] Figure 3 This is a side view of a cover plate in the prior art;

[0024] Figure 4 This is a schematic diagram of the structure of a cover plate in an embodiment of this application;

[0025] Figure 5This is a structural schematic diagram of a cover plate from another angle in an embodiment of this application;

[0026] Figure 6 This is a top view of a cover plate in an embodiment of this application;

[0027] Figure 7 yes Figure 6 Enlarged diagram of section A in the middle;

[0028] Figure 8 This is a cross-sectional view of a first thickened portion disposed at the top corner in an embodiment of this application;

[0029] Figure 9 This is a side view of a cover plate according to an embodiment of this application;

[0030] Figure 10 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application.

[0031] Reference numerals: 100-cover plate, 10-main body, 11-protruding area, 20-protruding part, 21-corner, 211-top corner, 212-bottom corner, 22-first thickened part, 23-second thickened part, 24-main body, 101-structural layer, 102-fireproof layer, 200-box body. Detailed Implementation

[0032] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering. For example, "parallel" refers to the angle between two lines, a line and a surface, or a surface and another surface, where the angle is -1° to 1°. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. For example, "perpendicular" refers to the angle between two lines, a line and a surface, or a surface and another surface, where the angle is 89° to 91°. Equal distances or equal angles include not only absolute equality but also approximate equality as commonly understood in engineering, meaning there may be a certain degree of error, such as a tolerance range of -1% to 1%.

[0037] The battery pack cover serves as a protective component at the top of the battery pack. It can support the upper structure when facing upwards and separate the battery cells from the upper structure when facing downwards, thus providing heat insulation and electrical insulation.

[0038] like Figures 1 to 3 As shown, a raised section is provided on the battery pack cover to accommodate the battery pack management system, providing more layout space for the battery cells. However, in practical applications, it has been found that the presence of this raised section easily leads to stress concentration and wear aging on the battery pack cover, resulting in damage to the battery pack cover, affecting its protective function for the internal structure of the battery pack, and shortening the overall service life of the battery pack.

[0039] For the reasons mentioned above, this application provides a battery pack. The battery pack disclosed in this application can improve the wear resistance of the cover plate and extend its service life, thereby ensuring the protective function of the cover plate for the internal battery cells, battery pack management system and other structures.

[0040] Reference Figures 4 to 10 Figure 1 shows a schematic diagram of a battery pack according to an embodiment of this application. As shown, the battery pack may specifically include: a housing 200, a cover plate 100, and battery cells. The housing 200 has a receiving cavity with an opening, and the battery cells are disposed in the receiving cavity. The cover plate 100 is connected to the housing 200 to seal the opening. The cover plate 100 includes a main body 10 and a protruding portion 20. The protruding portion 20 is connected to the main body 10 and protrudes from the main body 10 to the side away from the battery cells. The protruding portion 20 includes a body portion 24 and a first thickened portion 22, wherein the body portion 24 is connected to the main body 10 through the first thickened portion 22.

[0041] In this embodiment, the body portion 24 is a uniformly thick portion of the convex portion 20. By providing a first thickened portion 22 between the convex portion 20 and the body portion 10 of the cover plate 100, the stress value at the location of the first thickened portion 22 is smaller, improving the wear resistance of this area. Simultaneously, it ensures the connection strength between the convex portion 20 and the body portion 10, improving the structural strength of the cover plate 100, extending the service life of the cover plate 100, and ensuring the protective function of the cover plate 100 for internal structures such as battery cells and battery pack management systems. Furthermore, the first thickened portion 22 can enhance the connection strength between the convex portion 20 and the body portion 10, thereby reducing the vibration and abnormal noise of the convex portion 20. Moreover, from the perspective of manufacturing cost and process feasibility, thickening only the connection area between the body portion 24 of the convex portion 20 and the body portion 10, compared to overall thickening, can more effectively control material costs, reduce the overall weight of the battery pack, and avoid the adverse effects of excessive processing on the overall performance of the cover plate 100. This locally thickened design not only meets the structural strength requirements but also takes into account economy and practicality.

[0042] Specifically, the battery pack may include a housing 200, battery cells disposed within the housing 200, and a cover plate 100 connected to the housing 200. The housing 200 has a receiving cavity, within which the battery cells are disposed, and the cover plate 100 is connected to the housing 200 and seals the opening. The battery cells can store and release electrical energy, converting chemical energy into electrical energy through internal chemical reactions. During battery pack transportation and operation, because the battery cells are disposed within the receiving cavity, the housing 200 provides protection around the cells, preventing damage and ensuring the battery pack's performance. Furthermore, the cover plate 100 connected to the housing 200 seals the opening of the receiving cavity, preventing dust, moisture, and other external impurities from entering the battery pack, thereby reducing the probability of battery pack failure and ensuring the safety and reliability of the battery cells.

[0043] Furthermore, the cover plate 100 includes a main body 10 and a protruding portion 20. The protruding portion 20 is connected to the main body 10 and protrudes from the main body 10 towards the side away from the battery cell. The main body 10 and the protruding portion 20 serve as a protective structure to protect the battery cell. Because the protruding portion 20 protrudes towards the side away from the battery cell, a receiving space is formed on the side of the protruding portion 20 closest to the battery cell. In practical applications, this receiving space can be used to house components such as the battery management system (BMS) and battery disconnect unit (BDU) of the battery pack. Understandably, concentrating these components in the protruding portion 20 facilitates wiring between structures and improves the centralized management of the battery pack.

[0044] It should be noted that the protruding portion 20 may include multiple side plates and a top plate, which together form the aforementioned receiving space, such as... Figures 4 to 6As shown, the aforementioned corner 21 can be formed at the intersection of the side plate and the top plate of the protruding part 20, and at the intersection of the side plate of the protruding part 20 and the main body 10 of the cover plate 100. Since the corner 21 is usually a protruding part of the object's shape, these protruding parts are more likely to come into contact with and rub against the external environment. Furthermore, the corner 21 is usually a location where the structure undergoes abrupt changes. Such abrupt changes in structure can cause the stress distribution at that location to become uneven and concentrate near the corner 21. In addition, during the manufacturing process of the cover plate 100, the effects of processes such as high temperature or cooling can also generate complex stress distribution inside the cover plate 100, and these internal stresses are more likely to concentrate at the corner 21. For the above reasons, the cover plate 100 is more prone to damage at the corner 21. For example, stress concentration can greatly reduce the material's resistance to fracture and fatigue, and the corner 21 is more susceptible to structural damage due to external forces such as impacts and compression, and will also increase the degree of wear. In this embodiment of the application, by providing a first thickened portion 22 in a preset area centered on the corner 21, the wear of the preset area during the use of the battery pack can be reduced, the service life of the cover plate 100 can be extended, and the structural strength of the preset area can be enhanced, improving the impact and pressure resistance. In addition, the provision of the first thickened portion 22 also helps to disperse stress, thereby reducing structural damage caused by stress concentration, and can also avoid the phenomenon of vibration and abnormal noise during the use of the battery pack.

[0045] like Figures 4 to 6 As shown, the corner 21 includes a plurality of apex corners 211 on the side away from the main body 10, and a plurality of bottom corners 212 connected to the main body 10; wherein, the first thickened portion 22 is provided in at least one preset area centered on the apex corner 211, and / or, the first thickened portion 22 is provided in at least one preset area centered on the bottom corner 212.

[0046] In some optional embodiments of this application, the first thickened portion 22 is provided in a preset area centered on the apex 211. That is, at at least one apex 211 on the side of the convex portion 20 away from the main body portion 10, the preset area is divided with the apex 211 as the center and the first thickened portion 22 is provided. In this case, since the multiple apex 211 of the convex portion 20 protrude from the main body portion 10, the degree of wear caused by friction between the apex 211 and the external structure of the battery pack during use can be reduced, and the structural strength of the cover plate 100 can be improved, thus avoiding the problem of vibration and abnormal noise of the cover plate 100.

[0047] In some alternative embodiments of this application, the first thickened portion 22 is provided in a preset area centered on the bottom corner 212. That is, at at least one bottom corner 212 where the convex portion 20 intersects with the main body portion 10, a preset area is divided with the bottom corner 212 as the center and the first thickened portion 22 is provided. In this case, since the multiple bottom corners 212 of the convex portion 20 protrude into the receiving cavity inside the housing 200, the degree of wear caused by friction between the bottom corner 212 and the internal structure of the battery pack during use can be reduced, and the structural strength of the cover plate 100 can be improved, avoiding the problem of vibration and abnormal noise of the cover plate 100.

[0048] In addition, such as Figure 5 As shown, the first thickened portion 22 can also be set in a preset area centered on the top corner 211 and the bottom corner 212. This application does not make specific limitations on this.

[0049] Optionally, the convex portion 20 further includes a second thickened portion 23, which is connected between at least two first thickened portions 22 to disperse stress concentration at the corner 21.

[0050] Specifically, such as Figure 5 As shown, the convex portion 20 is disposed on one side edge of the main body 10 and has a first side and a second side disposed opposite to each other. The first side is disposed close to the edge of the main body 10, and the second side is disposed away from the edge of the main body 10. In practical applications, the first side is more likely to come into contact with external structures. In this embodiment, the convex portion 20 has a preset area centered on the top corner 211 and the bottom corner 212 on the first side and is provided with a first thickening portion 22, thus forming four first thickening portions 22 on the first side. At the same time, a second thickening portion 23 is provided on the second side and is disposed between the four first thickening portions 22. In this way, the stress of the four corners 21 is dispersed, the structural strength of the first side is further enhanced, and the vibration and noise problem of the cover plate 100 during the use of the battery pack is alleviated.

[0051] In one optional embodiment of this application, the first thickened portion 22 protrudes from the body portion 24 toward the side away from the battery cell. That is, the first thickened portion 22 is thickened toward the outside of the battery pack. Since various device structures are provided inside the protrusion portion 20, when the first thickened portion 22 is thickened outward, more space can be provided inside the protrusion portion 20 for arranging device structures, and the risk of short circuit caused by direct contact between the cover plate 100 and the collection components inside the battery pack can be avoided. The outward thickening also needs to be considered in conjunction with the overall vehicle layout.

[0052] In another alternative embodiment of this application, the first thickened portion 22 protrudes from the body portion 24 toward the side closer to the battery cell, thereby making the most of the internal space of the battery pack, reducing the overall height of the battery pack, and reducing the layout difficulty.

[0053] In another optional embodiment of this application, the first thickened portion 22 extends protruding both away from the battery cell and towards the battery cell, thereby making the structure of the first thickened portion 22 more balanced. It not only utilizes the internal space of the battery pack, but the outwardly thickened portion can also reduce the gap between the battery pack and the vehicle chassis, reducing the battery pack noise problem caused by the gap.

[0054] like Figure 7 As shown, the distance from the center of the first thickened portion 22 to the edge of the first thickened portion 22 is R, which satisfies: 20mm≤R≤500mm.

[0055] In practical applications, the corners 21 of the convex portion 20 can be rounded to reduce wear at the corners 21. The center of the first thickened portion 22 is the location where the corner 21 protrudes or retracts the most. Since the first thickened portion 22 is located on at least three surfaces simultaneously, its shape can be irregular. When the shape of the first thickened portion 22 is irregular, the distance R from its center to its edge can include multiple values.

[0056] Understandably, a reasonable R-value range can also take into account the needs of lightweight design and avoid excessive thickness leading to an increase in overall weight. This is of great significance for improving the battery pack and the range of electrical equipment. The R-value can be designed by comprehensively considering the actual size of the battery pack and the thickness of the cover plate.

[0057] Optionally, the thickness of the first thickened portion 22 is H1, and the thickness of the body portion 24 is H2, satisfying: H1-H2≥0.5mm. By controlling the thickness difference between the first thickened portion 22 and the body portion 24, targeted reinforcement of the corner 21 area of ​​the protrusion portion 20 of the battery pack cover 100 can be achieved, improving the safety and durability of the battery pack, and also helping to control manufacturing costs.

[0058] Specifically, in one embodiment of this application, the thickness of the first thickened portion 22 is H1, and the thickness of the main body portion 24 is H2, satisfying: 2mm≤H1≤3mm, 1.5mm≤H2≤2.5mm. For example, the thickness H1 of the first thickened portion 22 can be set to 2mm, 2.5mm, or 3mm, and the thickness H2 of the main body portion 24 can be set to 1.5mm, 2.0mm, or 2.5mm. In practical applications, the thickness can be designed according to actual needs to balance practicality and economy.

[0059] It should be noted that when the thickness of the main body 10 of the cover plate 100 is large and the strength is strong, the thickness and area of ​​the first thickened part 22 can be appropriately reduced. Conversely, if the thickness of the main body 10 of the cover plate 100 is small and the strength is insufficient, the thickness and area of ​​the thickened part need to be increased to ensure the structural strength of the cover plate 100.

[0060] Optionally, the thickness of the first thickened portion 22 decreases from the center to the edge to improve the appearance of the convex portion 20.

[0061] Furthermore, in one optional embodiment of this application, the thickness of the first thickened portion 22 decreases from the center to the edge until it is equal to the thickness of the main body portion 24. For example, the center thickness of the first thickened portion 22 is 3mm, and the thickness of the main body portion 24 is 2mm. The thickness of the first thickened portion 22 decreases from 3mm at the center to 2mm at the edge, thereby allowing for a smoother connection between it and the main body portion 24 of the protruding portion 20 or the main body portion 10 of the cover plate 100, resulting in a better overall appearance.

[0062] Understandably, when the thickness of the first thickened portion 22 remains uniform, the abrupt change in thickness between the edge of the first thickened portion 22 and the body portion 24 of the convex portion 20 or the main body portion 10 of the cover plate 100 is relatively large, which can easily lead to additional stress concentration at the edge of the first thickened portion 22. Therefore, setting the thickness of the first thickened portion 22 to decrease from the center to the edge can reduce the degree of thickness abruptness, thereby alleviating the degree of stress concentration. Furthermore, when the thickness of the first thickened portion 22 decreases from the center to the edge until it is equal to the thickness of the body portion 24, there is no abrupt change in thickness between the edge of the first thickened portion 22 and the body portion 24 of the convex portion 20 or the main body portion 10 of the cover plate 100, resulting in a smoother connection, more uniform structural strength, and a reduction in processing difficulty and cost to a certain extent.

[0063] In this embodiment, the cover plate 100 is made of non-metallic material, and the body part 24, the first thickened part 22 and the main body part 10 are integrally formed.

[0064] Among them, the cover plate 100 is made of non-metallic material, and the main body 24, the first thickened part 22 and the main body 10 can be integrally formed by molding and other processes, which reduces the processing difficulty and saves processing costs.

[0065] In one optional embodiment of this application, the cover plate 100 includes a structural layer 101 and a fireproof layer 102 disposed along the thickness direction. The fireproof layer 102 is disposed close to the battery cell. Both the structural layer 101 and the fireproof layer 102 are non-metallic layers to reduce the material cost of the cover plate 100.

[0066] It should be noted that the traditional cover plate 100 is made of steel. Although steel has a fire-resistant function, this structure is not conducive to cost reduction. In this application, both the structural layer 101 and the fireproof layer 102 are set as non-metallic layers, which is conducive to reducing production costs and can also reduce the weight of the cover plate 100 to a certain extent, thereby reducing the overall weight of the battery pack, which is of great significance for improving the battery pack and the range of electrical equipment.

[0067] Optionally, the structural layer 101 includes a glass fiber reinforced resin composite layer, and the fireproof layer 102 includes a ceramic silicone rubber layer.

[0068] Among them, the glass fiber reinforced resin composite layer is a functional material made of synthetic resin and glass fiber through a composite process. It has the advantages of being lightweight, high-strength, and corrosion-resistant. When used as a structural layer 101, it can reduce the weight of the cover plate 100 while ensuring the structural strength of the cover plate 100, thereby reducing the overall weight of the battery pack. At the same time, due to its corrosion resistance, it can extend the service life of the cover plate 100 when the battery pack is in a harsh environment.

[0069] Optionally, the main body 10 is provided with a raised area 11, which protrudes from the main body 10 in a direction away from the battery cell. The raised area 11 can be molded by the main body 10, which simplifies the processing technology. In practical applications, the height of the raised area 11 can be designed according to the gap between the cover plate 100 and the vehicle chassis, and the position and area of ​​the raised area 11 can be designed according to the structure of the vehicle chassis.

[0070] In practical applications, when the battery pack is used in new energy vehicles and installed under the vehicle chassis, the gap between the cover plate 100 and the vehicle chassis can cause unexpected shaking of the battery pack, resulting in unexpected impact and compression on the internal structure of the battery pack, and causing abnormal noises during vehicle operation, thus reducing the user experience. By optimizing the shape of the cover plate 100, i.e., by setting the raised area 11, the gap between the cover plate 100 and the vehicle chassis can be eliminated, and the structural strength of the cover plate 100 can be improved, thus avoiding unexpected shaking of the battery pack, eliminating abnormal noises, and improving the user experience. In addition, by setting the raised area 11 in the main body 10, compared with the overall thickening of the cover plate 100, material costs are saved, and the processing technology is simple and the molding effect is good.

[0071] In summary, the battery pack provided in this application embodiment has at least the following advantages:

[0072] In this embodiment, by providing a first thickened portion on the convex part of the cover plate, the stress value at the first thickened portion location can be reduced, while improving the wear resistance of this area. Since stress concentration is more likely to occur at the corners of the convex part, setting the first thickened portion in a preset area centered on the corners can effectively prevent excessive wear on the convex part at the corners, which could lead to damage to the cover plate, thereby extending the service life of the cover plate and ensuring the protective function of the cover plate for internal structures such as battery cells and battery pack management systems.

[0073] This application also provides an electrical device including the aforementioned battery pack. Specifically, the electrical device can be a car, an aircraft, or the like. This electrical device incorporates the advantages of the aforementioned battery pack.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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 application. 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.

[0075] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized by, The battery pack comprises a box (200), a cover plate (100) and a battery cell, the box (200) has a receiving cavity with an opening, the battery cell is arranged in the receiving cavity, and the cover plate (100) is connected to the box (200) to block the opening. The cover plate (100) comprises a main body part (10) and a convex part (20), the convex part (20) is connected to the main body part (10) and protrudes away from the side of the battery cell, and the convex part (20) comprises a body part (24) and a first thickening part (22), wherein the body part (24) is connected to the main body part (10) through the first thickening part (22).

2. The battery pack of claim 1, wherein, The convex part (20) has a plurality of corners (21), including a plurality of top corners (211) away from the side of the main body part (10) and a plurality of bottom corners (212) connected to the main body part (10); wherein the first thickening part (22) is arranged in at least one preset area with the top corner (211) as the center, and / or the first thickening part (22) is arranged in at least one preset area with the bottom corner (212) as the center.

3. The battery pack of claim 2, wherein, The convex part (20) further comprises a second thickening part (23), and the second thickening part (23) is connected between at least two first thickening parts (22).

4. The battery pack of claim 1, wherein, The first thickening part (22) protrudes and extends away from the side of the battery cell from the body part (24), and / or the first thickening part (22) protrudes and extends away from the side of the battery cell from the body part (24).

5. The battery pack of claim 1, wherein, The thickness of the first thickening part (22) decreases from the center to the edge.

6. The battery pack of claim 1, wherein, The cover plate (100) is non-metallic, and the body part (24), the first thickening part (22) and the main body part (10) are integrally formed.

7. The battery pack of claim 1, wherein, The cover plate (100) comprises a structural layer (101) and a fireproof layer (102) arranged in the thickness direction, and the fireproof layer (102) is arranged close to the battery cell, wherein the structural layer (101) and the fireproof layer (102) are both non-metallic layers.

8. The battery pack of claim 7, wherein, The structural layer (101) comprises a glass fiber reinforced resin composite layer, and the fireproof layer (102) comprises a ceramic silicone rubber layer.

9. The battery pack of claim 1, wherein, The main body part (10) is provided with a protruding area (11) protruding away from the battery cell.

10. An electrical device, characterized by The battery pack comprises the battery pack according to any one of claims 1 to 9.

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