Battery casing, battery, and electric device

Abstract

The present application relates to the technical field of batteries, and provides a battery casing, a battery, and an electric device. The battery casing comprises a housing, a first cover plate, and a second cover plate, wherein the housing is provided with a first opening and a second opening which are arranged opposite to each other, the housing comprises an extension portion, and the extension portion is suitable for being connected to an electric apparatus; the first cover plate is connected to the housing, and covers and seals the first opening; and the second cover plate is connected to the housing, and covers and seals the second opening. The present application can effectively utilize the internal space of the housing, thereby improving the energy density of the battery.

Description

Battery shell, battery and electric device

[0001] The present application claims priority to the Chinese patent publication with the publication number 202411750647.6, the title of which is "Battery shell, battery and electric device", filed on November 29, 2024 with the China Patent Office, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the technical field of batteries, in particular to a battery shell, a battery and an electric device. BACKGROUND

[0003] A battery is a device that converts chemical energy into electrical energy and is widely used in new energy vehicles, energy storage power stations, 3C products and other fields.

[0004] The battery is often fixed in the battery compartment of the electronic device through a fixed connecting piece, and it is difficult for the fixed connecting piece to balance the occupied space and the connection stability. SUMMARY

[0005] In view of the above problems, embodiments of the present application provide a battery shell, a battery and an electric device, which can effectively utilize the internal space of the shell, thereby improving the energy density of the battery.

[0006] To achieve the above-mentioned purpose, embodiments of the present application provide the following technical solutions:

[0007] A first aspect of embodiments of the present application provides a battery shell, comprising:

[0008] a shell, the shell having a first opening and a second opening arranged oppositely;

[0009] a first cover plate, the first cover plate being connected with the shell and covering the first opening;

[0010] a second cover plate, the second cover plate being connected with the shell and covering the second opening;

[0011] wherein the shell comprises an extension part, the extension part being adapted to be connected with an electric device.

[0012] In a possible implementation, the shell comprises a frame, the frame having the first opening and the second opening arranged oppositely, and the extension part is located at the first opening end and / or the second opening end of the frame.

[0013] In a possible implementation, the frame and the extension part are integrally formed.

[0014] In a possible implementation, the extension part is arranged along the circumference of the first opening end, and / or the extension part is arranged along the circumference of the second opening end.

[0015] In a possible implementation, the extension part is located at the second opening end of the frame body, and the extension part is adapted to be connected with the second cover plate.

[0016] In a possible implementation, the extension part is parallel to the second cover plate.

[0017] In a possible implementation, in the thickness direction of the second cover plate, the orthographic projection of the extension part at least partially overlaps with the orthographic projection of the second cover plate.

[0018] In a possible implementation, the extension part is provided with a first connecting hole, and the second cover plate is provided with a second connecting hole corresponding to the first connecting hole and in communication with the first connecting hole.

[0019] In a possible implementation, in the thickness direction of the second cover plate, the edge of the orthographic projection of the second cover plate is located inside the orthographic projection of the extension part.

[0020] In a possible implementation, the extension part is provided with a first connecting hole.

[0021] In a possible implementation, the extension part further comprises a receiving space, the receiving space extending towards the first cover plate and being in communication with the second opening;

[0022] The second cover plate is arranged in the receiving space and is fixedly connected with the extension part.

[0023] In a possible implementation, the size of the receiving space in the thickness direction of the second cover plate is greater than or equal to the thickness of the second cover plate.

[0024] In a possible implementation, the thickness of the extension part is greater than or equal to 0.1 mm.

[0025] In a possible implementation, the thickness of the first cover plate is less than or equal to the thickness of the shell.

[0026] And / or, the ratio of the thickness of the shell to the thickness of the first cover plate is (1.1-4):1.

[0027] In a possible implementation, the extension part and the frame body are transitioned by a circular arc, and the radius of the circular arc is 0.05 mm-0.5 mm.

[0028] In one possible implementation, the first cover plate and the housing have an included angle, which is a right angle.

[0029] In one possible implementation, the thickness of the second cover plate is less than or equal to the thickness of the housing;

[0030] And / or, the ratio of the thickness of the housing to the thickness of the second cover plate is (1-4):1.

[0031] In one possible implementation, the thickness of the second cover plate is equal to the thickness of the first cover plate.

[0032] In one possible implementation, the orthographic projection of the second cover plate onto the first cover plate covers the first cover plate and extends beyond the edge of the first cover plate.

[0033] In one possible implementation, at least one of the housing, the first cover plate, and the second cover plate is made of titanium alloy.

[0034] A second aspect of this application provides a battery comprising a battery cell and a battery casing as described in the first aspect; the battery cell is disposed within the casing of the battery casing.

[0035] A third aspect of this application provides an electrical device, including an electrical device and the battery described in the second aspect, wherein the battery is fixed to the electrical device via an extension portion and is used to provide electrical energy to the electrical device.

[0036] In one possible implementation, the electrical equipment further includes a fastener, and the extension includes a first connection hole;

[0037] The fastener passes through the first connection hole to connect the battery to the power device.

[0038] In one possible implementation, the electrical equipment further includes a fastener, the extended portion includes a first connecting hole, and the second cover plate is provided with a second connecting hole, the second connecting hole being correspondingly provided with and communicating with the first connecting hole;

[0039] The fastener passes through the first connection hole and the second connection hole to connect the battery to the electrical device.

[0040] In one possible implementation, the battery and the power-consuming device are connected by an extension portion.

[0041] The battery casing, battery, and electrical device provided in this application embodiment include a housing, a first cover plate, and a second cover plate. The first cover plate, the second cover plate, and the housing are separate structures. This allows for the reasonable setting of the thickness of the housing, the first cover plate, and the second cover plate, optimizing the utilization rate of the internal space of the battery casing and reducing its weight. This allows for accommodating more or larger capacity battery cells within the same external dimensions, reducing space waste and thereby increasing the battery's energy density. The battery is fixed in the electrical device via an extended portion provided in the housing, simplifying the manufacturing process.

[0042] Furthermore, the first cover plate, the second cover plate, and the housing are separate structures, which allows for more flexible design of the size and shape of the extension portion. It does not have to rely excessively on the first and second cover plates, allowing the extension portion to adapt to the installation space of different electrical devices, thus improving the applicability of the battery case. This can further improve the energy density of the battery while ensuring connection stability.

[0043] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the battery casing, battery, and electrical equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 is a perspective view of the battery casing provided in an embodiment of this application;

[0046] Figure 2 is an explosion diagram of the battery casing provided in an embodiment of this application;

[0047] Figure 3 is a top view of the battery casing provided in an embodiment of this application;

[0048] Figure 4 is a cross-sectional view along the AA direction in Figure 3;

[0049] Figure 5 is a schematic diagram of the internal structure of the battery casing provided in an embodiment of this application;

[0050] Figure 6 is an enlarged schematic diagram of region B in Figure 5;

[0051] Figure 7 is a second internal schematic diagram of the battery casing provided in an embodiment of this application;

[0052] Figure 8 is an enlarged schematic diagram of region C in Figure 7;

[0053] Figure 9 is a second explosion diagram of the battery casing provided in the embodiment of this application;

[0054] Figure 10 is a second internal schematic diagram of the battery casing provided in an embodiment of this application;

[0055] Figure 11 is an enlarged schematic diagram of region D in Figure 10;

[0056] Figure 12 is a schematic diagram of the battery provided in an embodiment of this application;

[0057] Figure 13 is a schematic diagram of the electrical equipment provided in the embodiment of this application.

[0058] Explanation of reference numerals in the attached drawings: 1000: Electrical equipment; 100: Battery; 110: Battery casing; 111: Housing; 112: First cover plate; 113: Second cover plate; 114: Extension; 1141: First connection hole; 1142: Accommodating space; 115: First opening; 116: Second opening; 117: Frame; 120: Battery cell; 130: Injection hole; 140: Terminal post; 150: Explosion-proof groove; 160: Seal; 200: Electrical device. Detailed Implementation

[0059] As described in the background section, the inventors discovered that the low energy density of batteries in related technologies is due to the fact that the connecting part and the casing are independent components, and the connecting part is relatively large, resulting in a heavy casing. Furthermore, the casing is typically formed using a stamping process, leading to uniform thickness of the side and bottom walls. This increases the overall weight of the casing. Additionally, the internal dimensions of the casing are usually fixed, making it impossible to flexibly adjust according to the actual size and layout requirements of the battery cells, resulting in wasted space. Therefore, the energy density of the battery is reduced.

[0060] To address the aforementioned technical problems, this application provides a battery casing, a battery, and an electrical device. The battery casing includes a housing, a first cover plate, and a second cover plate. The first cover plate, the second cover plate, and the housing are separate structures. This allows for the reasonable setting of the thickness of the housing, the first cover plate, and the second cover plate, optimizing the utilization of the internal space of the battery casing and reducing its weight. This allows for accommodating more or larger capacity battery cells within the same external dimensions, reducing space waste and thereby increasing the battery's energy density. The housing has an extension portion, through which the battery is fixed to the electrical device, simplifying the manufacturing process.

[0061] Furthermore, the first cover plate, the second cover plate, and the housing are separate structures, which allows for more flexible design of the size and shape of the extension portion. It does not have to rely excessively on the first and second cover plates, allowing the extension portion to adapt to the installation space of different electrical devices, thus improving the applicability of the battery housing and further increasing the energy density of the battery.

[0062] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0063] Please refer to Figures 1 and 2. This application provides a battery casing, which serves as a support component for supporting the battery cell. The battery casing can be square, cylindrical, other polygonal, or irregular in shape. The following description uses a square battery casing as an example to illustrate the structure of the battery casing in detail.

[0064] The battery casing 110 includes a housing 111, wherein the housing 111 includes a first opening 115 and a second opening 116 disposed opposite to each other, that is, the first opening 115 and the second opening 116 are disposed opposite to each other along the height direction of the housing 111. Taking the orientation shown in Figure 2 as an example, the first opening 115 is the bottom opening of the housing 111, and the second opening 116 is the top opening of the housing 111.

[0065] The housing 111 includes an extension portion 114, which is adapted to connect with the electrical device 200 (the structure of which is shown in Figure 13). It should be understood that the extension portion 114 can be directly connected to the electrical device 200, or it can be connected to the electrical device 200 through other components disposed on the extension portion 114. For example, the extension portion 114 is provided with a first connection hole 1141, which is adapted to connect with the electrical device 200 (the structure of which is shown in Figure 13). In this embodiment, the extension portion 114 and the housing 111 are integrally formed, which ensures the connection strength between the housing 111 and the extension portion 114, thus eliminating the need for separate welding of the connecting parts and simplifying the processing and forming process.

[0066] The battery casing 110 also includes a first cover plate 112, which is connected to the casing 111 and seals the first opening. The battery casing 110 also includes a second cover plate 113, which is connected to the casing 111 and seals the second opening. In this way, the casing 111, the first cover plate 112, and the second cover plate 113 can form the battery casing 110, improving the safety of the battery 100.

[0067] The first cover plate 112 serves as the bottom plate of the battery casing 110 and is a separate component from the casing 111. The second cover plate 113 serves as the top plate of the battery casing 110 and is a separate component from the casing 111.

[0068] The first cover plate 112 and the second cover plate 113 are both separate from the housing 111. In this way, the thickness of the housing 111, the first cover plate 112 and the second cover plate 113 can be reasonably set. For example, the thickness of the first cover plate 112 is less than the thickness of the housing 111, and / or the thickness of the second cover plate 113 is less than the thickness of the housing 111. This optimizes the utilization rate of the internal space of the battery housing 110 and optimizes the weight of the battery housing 110. As a result, more battery cells 120 or larger capacity battery cells 120 can be accommodated under the same external size, reducing space waste and thus improving the energy density of the battery 100.

[0069] In addition, the first cover plate 112, the second cover plate 113 and the housing 111 are separate structures, which allows for more flexible design of the size and shape of the extension portion 114, without relying excessively on the first cover plate 112 and the second cover plate 113. This allows the extension portion 114 to adapt to the installation space of different electrical devices 200, thus improving the applicability of the battery housing.

[0070] Since the extension portion 114 needs to have a certain thickness to ensure structural strength, separating the extension portion 114 from the first cover plate 112 and the second cover plate 113 allows for a reduction in the thickness of either the first cover plate 112 or the second cover plate 113, thereby reducing the thickness of the battery casing 110. This results in a smaller space occupied by the battery casing 110 and a larger volume of the battery cell 120 while maintaining the same volume of the battery 100, thus increasing the energy density of the battery 100. At the same time, the reduction in the thickness of the first cover plate 112 or the second cover plate 113 does not affect the thickness of the extension portion 114, ensuring that the structural strength of the extension portion 114 is not affected and improving the stability of the connection between the battery 100 and the power device 200.

[0071] In this embodiment, the first cover plate 112, the second cover plate 113, and the housing 111 can all be made of metal, and the specific materials can be the same or different. For example, the first cover plate 112, the second cover plate 113, and the housing 111 are made of the same material. For instance, the first cover plate 112, the second cover plate 113, and the housing 111 can all be made of stainless steel or titanium alloy.

[0072] The material of at least one of the shell 111, the first cover plate 112, and the second cover plate 113 includes titanium alloy. For example, the first cover plate 112, the second cover plate 113, and the shell 111 are all made of titanium alloy, which helps to reduce the weight of the overall structure and has high strength, which helps to improve the drop resistance of the battery 100. In addition, the use of titanium alloy material results in less heat-affected zone at the welded part of the shell 111 during welding and processing, and it is not easy to deform.

[0073] It should be noted that the materials of the first cover plate 112, the second cover plate 113 and the shell 111 can also be different. For example, the first cover plate 112 can be made of a thinner material with better thermal conductivity, depending on the amount of heat generated by the battery cell 120.

[0074] In this embodiment of the application, the housing 111 and the first cover plate 112 can be fixedly connected. For example, the housing 111 and the first cover plate 112 can be fixedly connected by welding, which can improve the connection strength between the housing 111 and the first cover plate 112.

[0075] In one possible implementation, the housing 111 includes a frame 117 having a first opening 115 and a second opening 116 disposed opposite to each other, with an extension 114 located at the first opening end and / or the second opening end of the frame 117. That is, the frame 117 is a cylindrical structure with openings at both ends. The shape of the frame 117 can be a regular shape, for example, a cylindrical shape or a rectangular shape. The shape of the frame 117 can also be irregular, which is not limited in this embodiment.

[0076] It should be noted that, in this embodiment, the first opening end can be understood as the end of the frame 117 opposite to the first opening 115, and at the same time, the second opening end can be understood as the end of the frame 117 opposite to the second opening 116.

[0077] In this embodiment, the number of extension portions 114 can be one or two. When there is only one extension portion 114, it can be located at the first opening end of the frame 117, or it can be located at the second opening end of the frame 117. This allows for a reasonable arrangement of the position of the extension portions 114 according to the structure of the electrical device 200, improving the design flexibility of the extension portions 114.

[0078] When there are two extension portions 114, one extension portion 114 is disposed at the first opening end of the frame 117, and the other extension portion 114 is disposed at the second opening end of the frame 117. In this way, the number of connection points between the battery case 110 and the power device 200 can be increased, thereby improving the connection strength between the battery case 110 and the power device 200.

[0079] In this embodiment, the frame 117 and the extension 114 can be integrally formed, making the connection between the frame 117 and the extension 114 more robust, without additional seams or connection points, thereby significantly improving the strength and stability of the battery casing 110. Exemplarily, during the manufacturing process of the battery casing 110, a stamping / stretching process is typically used to stamp the sheet metal and remove the bottom wall of the stamped product to simultaneously form the frame and the extension 114, making the extension 114 and the frame integrally formed. On the one hand, this greatly simplifies the production process, shortens the production cycle, and thus improves production efficiency; on the other hand, there are no weak points such as welds or adhesives at the connection points, making the casing 111 more robust and durable. This design helps improve the impact resistance and pressure resistance of the battery casing 110, ensuring the safety and reliability of the battery 100 during use.

[0080] Please continue referring to Figures 2 and 3. The extension portion 114 is arranged circumferentially around the first opening end, and / or, the extension portion 114 is arranged circumferentially around the second opening end. Thus, the extension portion 114 has a ring structure to increase the contact area between the extension portion 114 and the electrical device 200, thereby improving the connection strength between the extension portion 114 and the electrical device 200.

[0081] It should be understood that the extension portion 114 can be directly connected to the electrical device 200 or indirectly connected to the electrical device 200. For example, the extension portion 114 is located at the second opening of the frame, and the extension portion 114 is adapted to be connected to the second cover plate 113. Furthermore, by connecting to the electrical device 200 through the second cover plate 113, the connection method between the battery case 110 and the electrical device 200 is optimized.

[0082] Please refer to Figures 5 and 6. The extension portion 114 and the housing 111 are connected by an arc, or the extension portion 114 and the frame 117 are connected by an arc. The radius R of the arc is 0.05mm to 0.5mm, which ensures that the battery housing 110 occupies little space while also having high machinability.

[0083] The extension portion 114 is parallel to the second cover plate 113. In other words, the extension portion 114 extends outward along a direction perpendicular to the axis of the frame 117, so that the extension portion 114 is arranged horizontally. In this way, when the extension portion 114 is connected to the second cover plate 113, it can be ensured that the extension portion 114 and the second cover plate 113 are tightly fitted, forming a reliable sealing barrier. This tight fit not only effectively prevents the leakage of harmful substances such as electrolyte inside the casing, but also significantly improves the battery 100's protection against the external environment, such as waterproofing and dustproofing.

[0084] In addition, it facilitates the layout of the first connection hole 1141 of the extension portion 114 and makes it easier for the first connection hole 1141 to be connected to the electrical device 200 by fasteners.

[0085] In this embodiment, the relative positional relationship between the extension portion 114 and the second cover plate 113 can be selected in several ways. In the thickness direction of the second cover plate 113, the orthographic projection of the extension portion 114 and the orthographic projection of the second cover plate 113 at least partially coincide; that is, the edge of the orthographic projection of the second cover plate 113 on the plane where the extension portion 114 is located at least partially coincides with the orthographic projection of the extension portion 114. The extension portion 114 and the second cover plate 113 are sealed together, with a large contact area and low welding difficulty.

[0086] In one possible implementation, the orthographic projection of the extension portion 114 in the thickness direction of the second cover plate 113 completely coincides with the orthographic projection of the second cover plate 113. That is, referring to Figures 7 and 8, the second cover plate 113 covers the second opening and also covers the entire extension portion 114. In this way, the contact area between the second cover plate 113 and the extension portion 114 can be maximized, thereby improving the connection strength and sealing performance between the second cover plate 113 and the housing 111. Furthermore, when the housing 111 is relatively thin, the increased area of ​​the second cover plate 113 allows the battery casing 110 to have higher structural strength.

[0087] At this time, the extension portion 114 includes a first connecting hole 1141, which is disposed on the extension portion 114. The second cover plate 113 is provided with a second connecting hole (not shown in the figure), which is correspondingly disposed and connected to the first connecting hole 1141. This facilitates subsequent connection to the electrical device 200 by sequentially inserting fasteners through the first connecting hole 1141 and the second connecting hole. The diameter of the first connecting hole 1141 is 1mm to 2mm.

[0088] In another possible implementation, in the thickness direction of the second cover plate 113, the edge of the orthographic projection of the second cover plate 113 is located inside the orthographic projection of the extension portion 114. That is, the edge of the orthographic projection of the second cover plate 113 in the plane where the extension portion 114 is located is located inside the orthographic projection of the extension portion 114, i.e., the orthographic projection of the second cover plate 113 and the orthographic projection of the extension portion 114 partially coincide. For ease of explanation of the interior, the extension portion 114 has an inner edge connected to the frame and an outer edge away from the frame; wherein, the edge of the orthographic projection of the second cover plate 113 in the plane where the extension portion 114 is located is located between the inner edge and the outer edge of the extension portion 114.

[0089] Please refer to Figures 5 and 6. When the second cover plate 113 seals the second opening, it also covers part of the outer extension 114. In this way, the area of ​​the second cover plate 113 can be reduced while ensuring that the second cover plate 113 and the outer extension 114 can be connected, thereby reducing the weight of the battery case 110 and increasing the energy density of the battery 100.

[0090] In this embodiment, there are several options for the connection between the extension portion 114 and the second cover plate 113. For example, the extension portion 114 and the second cover plate 113 can be fixedly connected by welding to improve the connection strength between the extension portion 114 and the second cover plate 113.

[0091] In this embodiment, since a portion of the extension portion 114 is not covered by the second cover plate 113, the extension portion 114 can be directly connected to the power device 200. Exemplarily, the extension portion 114 includes a first connection hole 1141. This facilitates subsequent connection to the power device 200 using fasteners inserted through the first connection hole 1141, improving the ease of connection between the battery case 110 and the power device 200.

[0092] In the application embodiment, when there are multiple first connection holes 1141, the multiple first connection holes 1141 can be arranged at intervals along the circumferential direction of the extension portion 114, so as to maximize the connection strength between the battery case 110 and the power device 200.

[0093] In this embodiment, the connection between the extension portion 114 and the electrical device 200 is not limited to the above description, and other structures are also possible. For example, the extension portion 114 may also be provided with a snap fastener that extends toward the second cover plate 113. Correspondingly, the electrical device 200 is provided with a locking hole, and one end of the snap fastener engages in the locking hole to achieve the connection between the extension portion 114 and the electrical device 200.

[0094] For example, the welding area of ​​the extension portion 114 can be welded to the electrical device 200 by welding to achieve the connection between the battery case 110 and the electrical device 200.

[0095] In one possible implementation, referring to Figures 9 to 11, the extension 114 further includes a receiving space 1142, which extends toward the first cover plate 112 and communicates with the second opening; the second cover plate 113 is disposed in the receiving space 1142 and is fixedly connected to the extension 114, for example, the second cover plate 113 is welded to the inner wall of the receiving space 1142.

[0096] The accommodating space 1142 provides a stable support platform for the second cover 113, allowing the second cover 113 to be more securely connected to the extension 114. This design enhances the overall structural stability of the battery case 110 and improves the battery 100's resistance to deformation when subjected to external impacts or vibrations.

[0097] Furthermore, the tight fit between the accommodating space 1142 and the second cover plate 113 helps to form a reliable sealing barrier. Through fixed connection methods such as welding, it can be ensured that there is no gap between the second cover plate 113 and the inner wall of the accommodating space 1142, thereby effectively preventing the leakage of harmful substances such as electrolyte and improving the safety and reliability of the battery 100.

[0098] In this embodiment, the dimension of the accommodating space 1142 along the thickness direction of the second cover plate 113 is greater than or equal to the thickness of the second cover plate 113. This allows the top surface of the second cover plate 113 to be lower than or flush with the top surface of the extension portion 114 after welding. This saves space occupied by the battery casing 110 in the thickness direction, increases the energy density of the battery 100, and helps improve the overall performance of the battery 100. Furthermore, having the top surface of the second cover plate 113 lower than the top surface of the extension portion 114 also makes the appearance of the battery casing 110 neater and smoother.

[0099] In this embodiment, the thickness of the extension portion 114 and the housing 111 is greater than or equal to 0.1 mm, so as to improve the structural strength of the battery housing 110 while ensuring that the battery housing 110 is lightweight.

[0100] It should be understood that, given that the housing 111, the first cover plate 112, and the second cover plate 113 are relatively independent components, the thickness of each of the above components can be reasonably set.

[0101] For example, the thickness of the first cover plate 112 is less than or equal to the thickness of the housing 111. It should be noted that, in this embodiment, the housing 111 includes a frame and an extension 114, and the thickness of the housing 111 is the thickness of the frame.

[0102] The thickness of the first cover plate 112 is equal to the thickness of the shell 111. Alternatively, the thickness of the first cover plate 112 is less than the thickness of the shell 111. For example, the ratio of the thickness of the shell 111 to the thickness of the first cover plate 112 is (1.1 to 4):1. Exemplarily, the ratio of the thickness of the shell 111 to the thickness of the first cover plate 112 is 1.1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, and 4:1.

[0103] The thickness of the first cover plate 112 is less than the thickness of the housing 111, thus reducing the space occupied by the battery housing 110 in the thickness direction of the first cover plate 112, thereby providing space for increasing the battery capacity and helping to improve the battery 100's range. In addition, this embodiment can ensure the structural strength of the battery housing 110 while minimizing its weight, making it less prone to breakage or deformation.

[0104] In this embodiment, there is an included angle between the first cover plate 112 and the housing 111, which is a right angle. This included angle can be α as shown in Figures 5 and 6. This avoids the corner where the first cover plate 112 and the housing 111 connect being rounded, making the space enclosed by the first cover plate 112 and the housing 111 more square, thereby increasing the area of ​​this space, reducing unnecessary space waste, and allowing the space to accommodate a larger volume of battery cell 120, thus improving the energy density of the battery 100.

[0105] In other embodiments, the thickness of the second cover plate 113 is also defined. For example, the thickness of the second cover plate 113 can be defined by the thickness of the housing 111. Exemplarily, the thickness of the second cover plate 113 is less than or equal to the thickness of the housing 111. It should be noted that in this embodiment, the housing 111 includes a frame and an extension 114, and the thickness of the housing 111 is the thickness of the frame.

[0106] In one possible example, the thickness of the second cover plate 113 is equal to the thickness of the housing 111, thus ensuring the structural strength of the battery housing 110 and preventing damage caused by external forces. In another possible example, the thickness of the second cover plate 113 is less than the thickness of the housing 111, thus reducing the space occupied by the battery housing 110 in the thickness direction of the first cover plate 112, thereby providing space to increase the capacity of the battery cell 120 and helping to improve the range of the battery 100.

[0107] When the thickness of the second cover plate 113 is less than the thickness of the housing 111, the ratio of the thickness of the housing 111 to the thickness of the second cover plate 113 is (1-4):1. In this way, while minimizing the weight of the battery housing 110, the structural strength of the battery housing 110 can be guaranteed, making it less prone to breakage or deformation.

[0108] It should be noted that the thickness of the second cover plate 113 can be the same as or different from the thickness of the first cover plate 112. In one example, the thickness of the second cover plate 113 is the same as the thickness of the first cover plate 112. The battery casing 110 has consistent structural strength in the thickness direction of the two cover plates, which helps to maintain the overall mechanical balance of the battery casing 110 and prevents local strength deficiency or deformation when subjected to external forces.

[0109] It should be noted that the first cover plate 112 and the second cover plate 113 are not only limited in thickness, but also in area.

[0110] For example, the orthographic projection of the second cover plate 113 onto the first cover plate 112 covers the first cover plate 112 and extends beyond its edge. In other words, the area of ​​the second cover plate 113 is larger than the area of ​​the first cover plate 112. This increases the contact area between the second cover plate 113 and the housing 111, thereby improving the connection strength between the second cover plate 113 and the housing 111, and also enhances the sealing performance between the second cover plate 113 and the housing 111.

[0111] On the other hand, in this embodiment, the battery case 110 is usually connected to the power device 200 so that the battery 100 can provide power to the power device 200. In this embodiment, by increasing the area of ​​the second cover plate 113, it is easier to adapt to different power devices 200.

[0112] This application also provides a battery 100, which includes a battery cell 120 and a battery casing 110 as described in any of the above embodiments. The battery cell 120 is disposed within the casing 111 of the battery casing 110.

[0113] Since this embodiment includes the battery casing 110 described in any of the above embodiments, the battery 100 has the structure and beneficial effects of the battery casing 110, and will not be described in detail here.

[0114] It should be noted that the number of battery cells 120 can be one or more, and this embodiment will not impose any further restrictions.

[0115] In this embodiment, the battery 100 further includes an injection hole 130, which is disposed on the battery casing 110 and communicates with the inner cavity of the battery casing 110. This allows for the convenient injection of electrolyte into the inner cavity of the battery casing 110 through the injection hole 130.

[0116] It should be noted that the battery 100 also includes a seal 160, which is disposed in the electrolyte injection hole 130 and can effectively seal the electrolyte injection hole 130 to prevent electrolyte leakage from the electrolyte injection hole. This not only ensures the stability of the internal electrolyte of the battery 100, but also avoids the pollution and damage to the external environment of the battery 100 caused by electrolyte leakage. In addition, the seal 160 can also prevent external air and moisture from entering the battery casing 110 through the electrolyte injection hole 130, reducing the risk of unnecessary chemical reactions inside the battery 100, thereby improving the safety and reliability of the battery 100.

[0117] The battery 100 also includes a terminal post 140, which is used to connect the battery cell 120 to the tabs for outputting electrical energy. It should be noted that in this embodiment, the liquid injection hole 130 and the terminal post 140 are both provided on the housing 111 and located on the same wall surface of the housing 111, which facilitates the processing of the battery housing 110.

[0118] The second cover plate 113 is also provided with explosion-proof grooves 150. The depth of the explosion-proof grooves 150 is less than the thickness of the second cover plate 113. This makes the area where the explosion-proof grooves 150 are located a weak area. When the cell 120 experiences thermal failure, the air pressure inside the battery case 110 increases, and the explosion-proof grooves 150 burst open to release pressure, thereby improving the safety of the battery 100.

[0119] In this embodiment, the shape of the explosion-proof notch 150 can be selected in various ways. For example, the explosion-proof notch 150 can be arc-shaped.

[0120] This application embodiment also provides an electrical device 1000, including an electrical device 200 and a battery 100 described in the above embodiment. The battery 100 is fixed to the electrical device 200 through the extension 114 of the battery casing 110 and is used to provide electrical energy to the electrical device 200.

[0121] The electrical device 1000 also includes a fastener (not shown in the figure), and the extension portion 114 includes a first connecting hole 1141. The fastener passes through the first connecting hole 1141 and is fixedly connected to the electrical device 200 to realize a detachable connection between the battery 100 and the electrical device 200. In this embodiment, the fastener can be a screw or a bolt.

[0122] It should be noted that the connection method between the battery casing 110 and the power device 200 can be set according to the relative positions of the outer extension 114 and the second cover plate 113. For example, the second cover plate 113 completely covers the outer extension 114. In this case, the outer extension 114 includes a first connecting hole 1141, and the second cover plate 113 is provided with a second connecting hole. The second connecting hole and the first connecting hole 1141 are correspondingly arranged and communicate with each other. Fasteners pass through the first connecting hole 1141 and the second connecting hole to connect the battery 100 and the power device 200.

[0123] In this embodiment, the electrical device 200 can be connected to the outer extension 114 of the battery casing 110 not only via fasteners, but also via other connection methods. For example, the battery 100 and the electrical device 200 are snapped together via the outer extension 114. This can be understood as the electrical device 200 having a latch at a position opposite to the outer extension 114, the latch extending towards the outer extension 114 and engaging with it. Alternatively, the shape of the electrical device 200 can be adapted to the shape of the outer extension 114 for a limiting connection; for example, the electrical device 200 has a snap-fit ​​groove into which the outer extension 114 extends for fixation. In addition, welding, riveting, and other connection methods can also be used. This not only improves the convenience and flexibility of installation, but also reduces costs, enhances aesthetics, and improves connection reliability.

[0124] In this embodiment, the electrical device 1000 can be a vehicle, such as a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Correspondingly, the electrical device 200 can be the vehicle's drive mechanism or the vehicle's control system.

[0125] In addition, the electrical equipment 1000 can also be used for other energy storage devices, such as energy storage power stations, mobile phones, portable devices, laptops and wearable devices.

[0126] Since the electrical device 1000 in this embodiment includes the battery 100 described in any of the above embodiments, the electrical device 1000 includes the battery 100 structure and beneficial effects, which will not be described in detail here.

[0127] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0128] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A battery casing (110), wherein, include: The housing (111) has a first opening (115) and a second opening (116) disposed opposite to each other; A first cover plate (112) is connected to the housing (111) and seals the first opening (115); The second cover plate (113) is connected to the housing (111) and seals the second opening (116); The housing (111) includes an extension (114) adapted to be connected to an electrical device (200).

2. The battery casing (110) according to claim 1, wherein, The housing (111) includes a frame (117) having a first opening (115) and a second opening (116) disposed opposite to each other, and the extension (114) is located at the first opening end and / or the second opening end of the frame.

3. The battery casing (110) according to claim 2, wherein, The frame (117) and the extension (114) are integrally formed.

4. The battery casing (110) according to claim 2 or 3, wherein, The extension portion (114) is arranged circumferentially around the first opening end, and / or the extension portion (114) is arranged circumferentially around the second opening end.

5. The battery casing (110) according to any one of claims 2-4, wherein, The extension (114) is located at the second opening end of the frame (117), and the extension (114) is adapted to be connected to the second cover plate (113).

6. The battery casing (110) according to any one of claims 2-5, wherein, The extension portion (114) is parallel to the second cover plate (113).

7. The battery casing (110) according to claim 6, wherein, In the thickness direction of the second cover plate (113), the orthographic projection of the extension (114) at least partially coincides with the orthographic projection of the second cover plate (113).

8. The battery casing (110) according to claim 7, wherein, The extension portion (114) is provided with a first connecting hole (1141), and the second cover plate (113) is provided with a second connecting hole. The second connecting hole is correspondingly provided with and connected to the first connecting hole (1141).

9. The battery casing (110) according to claim 7, wherein, In the thickness direction of the second cover plate (113), the edge of the orthographic projection of the second cover plate (113) is located inside the orthographic projection of the extension (114).

10. The battery casing (110) according to claim 9, wherein, The extension portion (114) is provided with a first connecting hole (1141).

11. The battery casing (110) according to claim 9 or 10, wherein, The extension (114) further includes a receiving space (1142) that extends toward the first cover plate (112) and communicates with the second opening; The second cover plate (113) is disposed in the accommodating space (1142) and is fixedly connected to the extension portion (114).

12. The battery casing (110) according to claim 11, wherein, The dimension of the accommodating space (1142) along the thickness direction of the second cover plate (113) is greater than or equal to the thickness of the second cover plate (113).

13. The battery casing (110) according to any one of claims 1-12, wherein, The thickness of the extension portion (114) is greater than or equal to 0.1 mm.

14. The battery casing (110) according to any one of claims 1-13, wherein, The thickness of the first cover plate (112) is less than or equal to the thickness of the shell (111); And / or, the ratio of the thickness of the housing (111) to the thickness of the first cover plate (112) is (1.1 to 4):

1.

15. The battery casing (110) according to any one of claims 2-14, wherein, The extension portion (114) and the frame (117) are connected by a circular arc, the radius of which is 0.05mm to 0.5mm.

16. The battery casing (110) according to any one of claims 1-15, wherein, The first cover plate (112) and the housing (111) have an included angle, which is a right angle.

17. The battery casing (110) according to any one of claims 1-16, wherein, The thickness of the second cover plate (113) is less than or equal to the thickness of the housing (111); And / or, the ratio of the thickness of the housing (111) to the thickness of the second cover plate (113) is (1-4):

1.

18. The battery casing (110) according to claim 17, wherein, The thickness of the second cover plate (113) is equal to the thickness of the first cover plate (112).

19. The battery casing (110) according to any one of claims 1-18, wherein, The orthographic projection of the second cover plate (113) onto the first cover plate (112) covers the first cover plate (112) and extends beyond the edge of the first cover plate (112).

20. The battery casing (110) according to any one of claims 1-19, wherein, At least one of the housing (111), the first cover plate (112), and the second cover plate (113) is made of titanium alloy.

21. A battery (100), wherein, Includes a battery cell (120) and a battery casing (110) as described in any one of claims 1-20; The battery cell (120) is disposed inside the housing (111) of the battery case (110).

22. An electrical appliance (1000), wherein, Includes an electrical device (200) and a battery (100) as described in claim 21, wherein the battery (100) is fixed to the electrical device (200) by an extension portion (114) for providing electrical energy to the electrical device (200).

23. The electrical equipment (1000) according to claim 22, wherein, The electrical equipment (1000) also includes fasteners, and the extension (114) includes a first connecting hole (1141); The fastener passes through the first connection hole (1141) to connect the battery (100) to the power device (200).

24. The electrical equipment (1000) according to claim 22, wherein, The electrical equipment (1000) also includes fasteners, the extension (114) includes a first connecting hole (1141), and the second cover plate (113) is provided with a second connecting hole, the second connecting hole being correspondingly provided with and communicating with the first connecting hole (1141); The fastener passes through the first connection hole (1141) and the second connection hole to connect the battery (100) to the power device (200).

25. The electrical appliance (1000) according to any one of claims 22-24, wherein, The battery (100) and the power-consuming device (200) are engaged via the extension portion (114).

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