Battery case, single battery, battery pack, and electric device

Abstract

This utility model discloses a battery casing, a single battery cell, a battery pack, and an electrical device. The battery casing includes: a cover plate with a support portion extending circumferentially; and a bottom shell, with the support portion supported at the end of the bottom shell along its length. The bottom shell includes a main body and a thickened portion, with the thickened portion located at the end of the main body and connected to the support portion. The thickness of the main body is T1, and the thickness of the thickened portion is T2, where T1 < T2. Along the length of the bottom shell, the dimension of the support portion is L1, and the dimension of the thickened portion is L2, where L1 and L2 satisfy 1.2 × L1 ≤ L2 ≤ 5 × L1. According to this utility model embodiment, the battery casing, by providing a thickened portion on the bottom shell connected to the support portion on the cover plate, and further designing the dimensional relationship between the thickened portion and the support portion, can improve welding strength and welding yield, while also balancing battery capacity and overall weight, and enhancing overall structural strength.

Description

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202521248231.4, entitled Battery Casing, Single Cell Battery, Battery Pack and Electrical Device, filed on June 18, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This utility model relates to the field of battery technology, and in particular to a battery casing, a single cell, a battery pack, and an electrical device. Background Technology

[0004] Battery casings in related technologies typically have a bottom shell and a cover plate. The bottom shell is used to house the electrode core, and the cover plate is supported by the bottom shell and welded to it to seal the bottom shell.

[0005] However, due to the thinness of the bottom shell in the relevant technology, the bottom shell is prone to deformation and the mating edge with the cover plate is not completely straight. During welding, the laser welds along a fixed path, resulting in too little local melting zone and low welding strength. Alternatively, if the bottom shell itself is too thin, holes will be generated during welding, which will easily lead to welding defects and poor welding effect when welding the mating surface of the bottom shell and the cover plate. Utility Model Content

[0006] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of this utility model is to provide a battery casing that, by providing a thickened portion on the bottom shell and connecting it to a support portion on the cover plate, and further designing the dimensional relationship between the thickened portion and the support portion, can improve welding strength and welding yield, and can balance battery capacity and overall weight while improving overall structural strength.

[0007] According to an embodiment of the present invention, a single-cell battery having the above-described battery casing is also proposed.

[0008] According to an embodiment of the present invention, a battery pack having the above-mentioned single battery cell is also proposed.

[0009] According to an embodiment of the present invention, an electrical device having the above-described battery pack is also proposed.

[0010] To achieve the above objectives, a battery housing is provided according to a first aspect of the present invention. The battery housing includes: a cover plate having a support portion extending circumferentially; and a bottom shell having the support portion supported at the end of the bottom shell along its length direction. The bottom shell includes a main body and a thickened portion, the thickened portion being located at the end of the main body and connected to the support portion. The thickness of the main body is T1, the thickness of the thickened portion is T2, and T1 and T2 satisfy: T1 < T2. Along the length direction of the bottom shell, the dimension of the support portion is L1, the dimension of the thickened portion is L2, and L1 and L2 satisfy: 1.2 × L1 ≤ L2 ≤ 5 × L1.

[0011] Therefore, according to the embodiment of the present utility model, the cover plate of the battery casing, by providing a thickened part on the bottom shell and connecting it with the support part on the cover plate, and further designing the dimensional relationship between the thickened part and the support part, can improve the welding strength and welding yield, and can take into account the battery capacity and overall weight, and improve the overall structural strength.

[0012] According to some embodiments of the present invention, T1 and T2 satisfy: 1.2×T1≤T2≤2.5×T1.

[0013] According to some embodiments of the present invention, the bottom shell includes a plurality of side edges connected end to end, and the plurality of side edges include: two first side edges, which are arranged opposite to each other; two second side edges, which are arranged opposite to each other, and the two second side edges and the two first side edges are alternately connected; wherein, along the circumferential direction of the bottom shell, the size of the first side edge is smaller than the size of the second side edge, and at least the first side edge is provided with the thickened portion.

[0014] According to some embodiments of the present invention, both the first side and the second side are provided with the thickened portion, and the thickened portion extends in a ring shape along the circumference of the bottom shell.

[0015] According to some embodiments of the present invention, the thickened portion is disposed on both of the first side edges; or, the thickened portion is disposed on one of the two first side edges.

[0016] According to some embodiments of the present invention, a plurality of the sides are provided with the thickened portion, and the thickness of the thickened portion of the plurality of the sides is the same, and the size of the thickened portion of the plurality of the sides is the same along the length direction of the bottom shell.

[0017] According to some embodiments of the present invention, the outer side of the thickened portion is flush with the outer side of the main body portion, and the inner side of the thickened portion protrudes from the inner side of the main body portion.

[0018] According to some embodiments of the present invention, there are multiple thickened portions located at opposite ends of the main body, and multiple cover plates are respectively connected to opposite ends of the bottom shell.

[0019] According to a second aspect of the present invention, a single-cell battery is provided, the single-cell battery comprising: a battery casing as described in the first aspect of the present invention; and an electrode core disposed within the battery casing.

[0020] According to the second aspect of the present invention, the single battery cell utilizes the battery casing described in the first aspect of the present invention, with a thickened portion on the bottom shell connected to a support portion on the cover plate, and further designs the dimensional relationship between the thickened portion and the support portion, which can improve welding strength and welding yield, and can balance battery capacity and overall weight, and improve overall structural strength.

[0021] According to some embodiments of the present invention, along the length direction of the electrode core, one end of the thickened portion adjacent to the electrode core is spaced apart from the electrode core.

[0022] A battery pack is provided according to a third aspect of the present invention, the battery pack comprising individual batteries according to a second aspect of the present invention.

[0023] According to the third aspect of the present invention, the battery pack utilizes the single battery described in the second aspect of the present invention, with the thickened portion on the bottom shell connected to the support portion on the cover plate, and the dimensional relationship between the thickened portion and the support portion further designed, which can improve the welding strength and welding yield, and can balance battery capacity and overall weight, improve the overall structural strength, and make the structural stability of the single battery higher, thereby improving the safety of the battery pack.

[0024] According to a fourth aspect of the present invention, an electrical device is provided, the electrical device comprising a single battery according to a second aspect of the present invention or a battery pack according to a third aspect of the present invention.

[0025] According to the fourth aspect embodiment of the present invention, the electrical equipment can utilize the single battery according to the second aspect embodiment of the present invention or the battery pack according to the third aspect embodiment of the present invention. The single battery has higher structural stability and the battery pack has higher safety, thereby improving the electrical safety of the electrical equipment.

[0026] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a cross-sectional view of a single battery cell according to an embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the battery casing according to an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the battery casing according to the first embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the battery casing according to the second embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the battery casing according to the third embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the coil material according to the first embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the coil material according to the second embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of the roll material according to the third embodiment of the present utility model.

[0036] Figure label:

[0037] 1. Battery casing;

[0038] 100. Cover plate; 110. Cover body; 120. Support part;

[0039] 200. Bottom shell; 210. Main body; 220. Thickened part; 230. Side; 231. First side; 232. Second side;

[0040] 300, coil material; 310, thickened area. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown 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 utility model, and should not be construed as limiting this utility model.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0043] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0044] In the description of this utility model, "multiple" means two or more, and "several" means one or more.

[0045] The battery casing 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0046] like Figures 1-5 As shown, the battery casing 1 according to an embodiment of the present invention includes a cover plate 100 and a bottom shell 200.

[0047] The cover plate 100 is provided with a support portion 120 extending in the circumferential direction. The support portion 120 is supported at the end of the bottom shell 200 in the length direction. The bottom shell 200 includes a main body portion 210 and a thickened portion 220. The thickened portion 220 is provided at the end of the main body portion 210 and is connected to the support portion 120.

[0048] The thickness of the main body 210 is T1, the thickness of the thickened part 220 is T2, and T1 and T2 satisfy: T1 < T2; along the length direction of the bottom shell 200, the size of the support part 120 is L1, the size of the thickened part 220 is L2, and L1 and L2 satisfy: 1.2 × L1 ≤ L2 ≤ 5 × L1.

[0049] The cover plate 100 and the bottom shell 200 can be connected by welding. The cover plate 100 may include a cover body 110 and a support part 120. The support part 120 may be located on the radially outer side of the cover body 110 and extend along the circumference of the cover body 110. When the cover plate 100 is connected to the bottom shell 200, a part of the cover body 110 may extend into the bottom shell 200, while the support part 120 may be supported on the outside of the bottom shell 200. This arrangement can increase the contact area between the cover plate 100 and the bottom shell 200 and improve the stability of the mutual support between the cover plate 100 and the bottom shell 200, so as to ensure a stable connection between the cover plate 100 and the bottom shell 200.

[0050] According to the embodiment of the present invention, the battery casing 1 has a thickened portion 220 at the end of the main body portion 210, and the thickness T2 of the thickened portion 220 is greater than the thickness T1 of the main body portion 210. This allows for local thickening of the end of the bottom shell 200, thereby improving the structural strength of the bottom shell 200 at the end and making the bottom shell 200 less prone to deformation. It is understood that a thicker welding area can improve the welding yield, thereby preventing holes from forming in the bottom shell 200 during welding. Furthermore, the welding strength between the cover plate 100 and the bottom shell 200 can be higher, resulting in a better welding effect. This allows for a more stable connection between the cover plate 100 and the bottom shell 200, and the enhanced structural strength of the bottom shell 200 allows it to better protect the electrode core.

[0051] In addition, compared to thickening the entire bottom shell, this embodiment of the invention only provides a thickened portion 220 at the end of the bottom shell 200 to locally thicken the bottom shell 200. This can improve the structural strength of the bottom shell 200 while also increasing the capacity of the battery casing 1, avoiding excessive weight of the bottom shell 200, reducing the overall weight of the battery casing 1, and saving materials to reduce costs.

[0052] Furthermore, the relationship between the dimension L2 of the thickened portion 220 and the dimension L1 of the support portion 120 was further designed, that is, L1 and L2 satisfy: 1.2×L1≤L2≤5×L1. For example, the dimension L2 of the thickened portion 220 can be 1.2×L1, 1.4×L1, 1.6×L1, 1.8×L1, 2.0×L1, 2.4×L1, 2.8×L1, 2.9×L1, 3×L1, 3.2×L1, 3.6×L1, 4.0×L1, 4.4×L1, 4.8×L1 or 4, 5×L1. This design ensures that the dimensions of the thickened portion 220 along the length of the bottom shell 200 meet the size of the welding area, thus guaranteeing sufficient welding area after the thickened portion 220 and the support portion 120 are fastened together. This prevents the welding area from exceeding the thickened portion 220 and causing perforation, and also ensures the structural strength of the bottom shell 200 at the end, thereby improving the overall deformation resistance of the bottom shell 200 and making the connection between the cover plate 100 and the bottom shell 200 more stable and reliable. On the other hand, it avoids the thickened portion 220 from being too large along the length of the bottom shell 200, thus preventing the thickened portion 220 from excessively occupying the internal space of the battery casing 1. This allows the battery casing 1 to have sufficient space to arrange the electrode core, ensuring the battery capacity, saving materials, reducing costs, and facilitating the lightweighting of individual batteries.

[0053] Thus, according to the embodiment of the present utility model, the battery casing 1, by providing a thickened portion 220 on the bottom shell 200 and connecting it with the support portion 120 on the cover plate 100, and further designing the dimensional relationship between the thickened portion 220 and the support portion 120, can improve the welding strength and welding yield, and can take into account the battery capacity and overall weight, and improve the overall structural strength.

[0054] In some specific embodiments of this utility model, T1 and T2 satisfy: 1.2×T1≤T2≤2.5×T1.

[0055] For example, the thickness T2 of the thickened portion 220 can be 1.2×T1, 1.4×T1, 1.6×T1, 1.8×T1, 2×T1, 2.1×T1, 2.2×T1, 2.4×T1, or 2.5×T1. This ensures that the thickened portion 220 has sufficient thickness to effectively improve the welding strength and welding yield between the bottom shell 200 and the cover plate 100, so as to ensure a stable connection between the bottom shell 200 and the cover plate 100. On the other hand, it avoids the thickened portion 220 from being too thick, thereby preventing the thickened portion 220 from occupying too much space inside the battery casing 1. This not only helps to increase the battery capacity but also facilitates the installation of the electrode core and prevents interference between the thickened portion 220 and the electrode core.

[0056] The following section, using data from Table 1, details the relationship between the dimensions L2 of the thickened portion 220 and L1 of the support portion 120, as well as the relationship between the thickness T2 of the thickened portion 220 and the thickness T1 of the main body portion 210, and their impact on weld failure strength, welding yield, and assembly convenience.

[0057] The following example illustrates how the weld strength, welding yield, and assembly impact of the connection between the thickened portion 220 and the cover plate 100 vary with the thickness L2 of the thickened portion when the thickness T2 of the thickened portion 220 remains constant; and how the weld strength, welding yield, and assembly impact of the connection between the thickened portion 220 and the cover plate 100 vary with the thickness T2 of the thickened portion when the thickness L2 of the thickened portion 220 remains constant.

[0058] Table 1

[0059]

[0060] It should be understood by those skilled in the art that the weld failure strength in this application refers to the resistance to damage of the weld at the welded joint of the cover plate 100 and the bottom shell 200. The higher the weld failure strength, the less likely the structure of the welded joint of the cover plate 100 and the bottom shell 200 is to be damaged.

[0061] The relationship between the dimension L2 of the thickened portion 220 and the dimension L1 of the supporting portion 120 is 1.2 × L1 ≤ L2 ≤ 5 × L1:

[0062] Based on the data from multiple embodiments in Table 1, such as Embodiments 1-3 (or Embodiments 4-6, or Embodiments 7-9), it can be seen that when the thickness T1 of the main body 210, the dimension L1 of the support 120, and the thickness T2 of the thickened portion 220 remain unchanged, and the length L2 of the thickened portion 220 reaches a certain value (i.e., satisfying 1.2×L1≤L2), the weld failure strength and welding yield can be improved compared to the prior art. Furthermore, even if the length L2 of the thickened portion 220 is further increased, it will no longer affect the welding connection strength and welding yield between the thickened portion 220 and the cover plate 100. However, further increasing the length L2 of the thickened portion 220 will still further improve the overall structural strength of the bottom shell 200, making the bottom shell 200 more resistant to deformation. Under impact and vibration, the bottom shell 200 is less prone to deformation, thus better supporting and protecting the electrode core.

[0063] It should be further understood that the maximum example of the length L2 of the thickened portion 220 in Table 1 above is 2.5mm, and examples with L2 greater than 2.5mm are not shown. This is because if L2 is greater than 2.5mm, the thickened portion 220 will occupy too much of the internal space of the bottom shell 200, thereby excessively encroaching on the arrangement space of the electrode core and affecting the battery capacity.

[0064] In summary, by setting the relationship between the dimensions L2 of the thickened part 220 and L1 of the support part 120 as 1.2×L1≤L2≤5×L1, it is possible to comprehensively consider the weld failure strength, welding yield, overall structural strength and battery capacity, and achieve an effective balance in all aspects.

[0065] The relationship between the thickness T2 of the thickened portion 220 and the thickness T1 of the main body portion 210 is 1.2 × T1 ≤ T2 ≤ 2.5 × T1:

[0066] Based on the data from multiple embodiments in Table 1, such as Embodiments 1, 4 and 7 (or Embodiments 2, 5 and 8, or Embodiments 3, 6 and 9), it can be seen that when the thickness T1 of the main body 210 and the size L1 of the support 120 remain unchanged, the length L2 of the thickened part 220 is constant. Under this condition, the thicker the thickness T2 of the thickened part 220, the stronger the weld's resistance to damage and the higher the welding yield. Moreover, if the thickness T2 of the thickened part 220 exceeds a certain range, it will cause the assembly gap to become smaller, and the core assembly into the shell will require assistance.

[0067] More specifically, as can be seen from Comparative Examples 1 to 6, if the thickness T2 of the thickened portion 220 is lower than a certain value (e.g., 0.24 mm), for example, if the thickness T2 of the thickened portion 220 is 0.2 mm, it will result in insufficient weld strength between the thickened portion 220 and the cover plate 100 and a low welding yield. If the thickness T2 of the thickened portion 220 exceeds a certain value (e.g., 0.5 mm), for example, if the thickness T2 of the thickened portion 220 is 0.6 mm, although it is beneficial to improve the weld strength and welding yield between the thickened portion 220 and the cover plate 100, it will cause interference between the thickened portion 220 and the electrode core assembly, thus making it difficult for the electrode core to be inserted into the shell.

[0068] In summary, by setting the relationship between the thickness T2 of the thickened part 220 and the thickness T1 of the main body part 210 as 1.2×T1≤T2≤2.5×T1, the weld failure strength, welding yield and assembly convenience can be comprehensively considered, and an effective balance can be achieved in all aspects.

[0069] In some specific embodiments of this utility model, such as Figures 2-5 As shown, the bottom shell 200 includes a plurality of side edges 230 connected end to end, and the plurality of side edges 230 includes two first side edges 231 and two second side edges 232.

[0070] Two first sides 231 are arranged opposite each other, two second sides 232 are arranged opposite each other, and the two second sides 232 and the two first sides 231 are alternately connected.

[0071] In the circumferential direction of the bottom shell 200, the size of the first side 231 is smaller than the size of the second side 232, and at least the first side 231 is provided with a thickened portion 220.

[0072] For example, the formed bottom shell 200 can be processed in a secondary manner. Specifically, the end of the bottom shell 200 can be locally heated. After being heated to a preset temperature, the heated area is placed in an upsetting mold to upset the heated area. This can thicken the end of the bottom shell 200 to form a thickened part 220 at the end of the bottom shell 200.

[0073] The thickened portion 220 is provided at least on the first side 231. This means that the thickened portion 220 can be provided on the first side 231, or on both the first side 231 and the second side 232. This thickened portion 220 enhances the structural strength of the bottom shell 200 at its ends, thereby improving the welding strength between the bottom shell 200 and the cover plate 100. This, in turn, improves the stability and reliability of the connection between the bottom shell 200 and the cover plate 100, resulting in a better welding effect.

[0074] Furthermore, such as Figure 3As shown, both the first side 231 and the second side 232 are provided with thickened portions 220, and the thickened portions 220 extend in a ring shape along the circumference of the bottom shell 200.

[0075] In other words, the multiple circumferential sides 230 of the bottom shell 200 are provided with thickened portions 220, which extend along the circumference of the bottom shell 200 to form a whole.

[0076] In this way, by providing thickened portions 220 on both the first side 231 and the second side 232, the thickened portions 220 are used more effectively to enhance the structural strength of the bottom shell 200 at the end position, further improving the welding strength between the bottom shell 200 and the cover plate 100, thereby significantly improving the stability and reliability of the connection between the bottom shell 200 and the cover plate 100.

[0077] In other specific embodiments of this utility model, such as Figure 4 As shown, the thickened portion 220 is provided on the two first side edges 231.

[0078] In other words, in this embodiment, thickened portions 220 are provided only on the two first sides 231, and thickened portions 220 are not provided on the second side 232.

[0079] In this way, by providing thickened portions 220 on the two first sides 231, the thickness of the two first sides 231 can be strengthened, thereby increasing the structural strength of the two first sides 231, which in turn increases the welding strength between the ends of the first sides 231 and the cover plate 100. This also increases the connection strength between the cover plate 100 and the bottom shell 200, so that the overall structure of the battery casing 1 is stronger.

[0080] Furthermore, it should be noted that when individual cells are assembled, the shorter first side 231 is usually located at the bottom. By providing a thickened portion 220 on the first side 231, the structural strength of the first side 231 can be improved. During vibration and impact, the thickened portion 220 can enhance the support effect on the individual cells along the length of the battery casing 1.

[0081] In other specific embodiments of this utility model, such as Figure 5 As shown, the thickened portion 220 is provided on the lower side of one of the two first side edges 231.

[0082] In other words, in this embodiment, the thickened portion 220 is provided only on the first side 231 located on the lower side, and the other sides are not provided with thickened portions 220.

[0083] By providing a thickened portion 220 on the lower side 231 of the bottom shell 200, the thickness of the lower side 231 can be increased, thereby improving the structural strength of the lower side 231. This enhances the welding strength between the end of the lower side 231 and the cover plate 100, resulting in a higher connection strength between the cover plate 100 and the bottom shell 200. Furthermore, by increasing the structural strength of the lower side 231, the thickened portion 220 can strengthen the support effect on the individual cells along the length of the battery casing 1 during vibration and impact.

[0084] In some specific embodiments of this utility model, such as Figures 2-5 As shown, multiple sides 230 are provided with thickened portions 220, and the thickness of the thickened portions 220 of the multiple sides 230 is the same, and the size of the thickened portions 220 of the multiple sides 230 is the same along the length direction of the bottom shell 200.

[0085] By providing thickened portions 220 on multiple sides 230, the thickness of the ends of the multiple sides 230 can be significantly increased, thereby improving the structural strength of the multiple sides 230 and increasing the welding strength between the bottom shell 200 and the cover plate 100. Furthermore, by ensuring that the thickness of the multiple thickened portions 220 and their dimensions along the length of the bottom shell 200 are the same, the structure of the multiple thickened portions 220 can be kept consistent, which simplifies the structure and manufacturing process of the thickened portions 220, thereby improving the processing efficiency of the bottom shell 200.

[0086] In some specific embodiments of this utility model, such as Figures 2-5 As shown, the outer side of the thickened portion 220 is flush with the outer side of the main body portion 210, and the inner side of the thickened portion 220 protrudes from the inner side of the main body portion 210.

[0087] This design not only allows the thickness of the thickened portion 220 to be greater than that of the main body portion 210, thereby improving the structural strength of the bottom shell 200 at the end, but also makes the appearance of the battery casing 1 more regular and aesthetically pleasing, and the structure simpler. When the individual battery is installed in the battery pack, it can avoid the thickened portion 220 from interfering with other components or positions, making the structural design more reasonable.

[0088] In some specific embodiments of this utility model, there are multiple thickened portions 220 and they are disposed at opposite ends of the main body portion 210, and there are multiple cover plates 100 and they are respectively connected to opposite ends of the bottom shell 200.

[0089] In other words, the two ends of the bottom shell 200 are respectively sealed by a cover plate 100. The two ends of the bottom shell 200 can be welded to the cover plate 100 through the thickened part 220. This can make the structural strength of the two ends of the bottom shell 200 higher, thereby improving the connection strength between the two ends of the bottom shell 200 and the cover plate 100, and making the overall structural strength of the battery casing 1 higher.

[0090] The following example illustrates the processing and forming method of the battery casing 1 in an embodiment of this utility model.

[0091] For example, in one embodiment, such as Figure 6 As shown, multiple thickened areas 310 can be provided on the roll 300. The multiple thickened areas 310 can be arranged at intervals along the curling direction of the roll 300 (that is, arranged at intervals along the circumference of the roll 300), and each thickened area 310 extends along the axial direction of the roll 300.

[0092] Specifically, by cutting and cutting on the adjacent thickened area 310, a portion of the roll material 300 can be cut off. Then, the cut portion of the roll material 300 is bent along the axial direction of the roll material 300 to form a bottom shell 200. The bottom shell 200 formed at this time can be provided with a thickened portion 200 extending in a ring shape along the circumference of the bottom shell 200; or, the cut portion of the roll material 300 can be bent along the curling direction of the roll material 300 to form a bottom shell 200. In this case, the bottom shell 200 formed at this time has a thickened portion 220 only on one first side 231.

[0093] Alternatively, the material can be cut into three thickened areas 310, and then the cut portion of the roll 300 can be bent along the curling direction of the roll 300 to form a bottom shell 200. The bottom shell 200 formed at this time can have thickened portions 200 on both first sides 231.

[0094] In another embodiment, such as Figure 7 As shown, two thickened regions 310 can be provided on the coil 300. The two thickened regions 310 are respectively adjacent to the two ends of the axial direction of the coil 300, and each thickened region 310 extends along the curling direction of the coil 300.

[0095] Specifically, the roll material 300 can be cut at certain intervals to cut off a portion of the roll material 300. Then, the cut portion of the roll material 300 can be bent along the curling direction of the roll material 300 to form a bottom shell 200. The bottom shell 200 formed at this time can be provided with a thickened portion 200 extending in a ring shape along the circumference of the bottom shell 200. Alternatively, the cut portion of the roll material 300 can be bent along the axial direction of the roll material 300 to form a bottom shell 200. In this case, the bottom shell 200 formed at this time has a thickened portion 220 only on one first side 231.

[0096] Alternatively, in another embodiment, such as Figure 8 As shown, three thickened areas 310 can be spaced apart along the axial direction of the roll material 300. Then, the roll material 300 can be cut at certain intervals, and the cut roll material 300 can be bent along the axial direction of the roll material 300 to form a bottom shell 200. At this time, thickened portions 200 can be formed on both first side edges 231 of the bottom shell 200.

[0097] The following description, with reference to the accompanying drawings, describes a single-cell battery according to an embodiment of the present invention.

[0098] The single battery includes a battery casing 1 and an electrode core according to the above embodiments of the present invention, with the electrode core disposed inside the battery casing 1.

[0099] According to the embodiment of the present invention, the single battery cell utilizes the battery casing 1 of the above embodiment of the present invention, in which a thickened portion 220 is provided on the bottom shell 200 and connected to the support portion 120 on the cover plate 100, and the dimensional relationship between the thickened portion 220 and the support portion 120 is further designed, which can improve the welding strength and welding yield, and can take into account the battery capacity and overall weight, and improve the overall structural strength, thereby improving the reliability of the single battery cell.

[0100] In some specific embodiments of this utility model, along the length direction of the electrode core, one end of the thickened portion 220 adjacent to the electrode core is spaced apart from the electrode core. This spacing can be a certain gap between the thickened portion 220 and the electrode core in the length direction, or it can be set tightly against each other.

[0101] By positioning the thickened portion 220 and the electrode core separately within the battery casing 1, positional interference between the thickened portion 220 and the electrode core in the length direction of the electrode core can be avoided. This facilitates the placement of the electrode core within the battery casing 1 and does not affect the welding connection between the thickened portion 220 and the cover plate 100, thereby ensuring the stability and reliability of the individual battery cell.

[0102] The following description, with reference to the accompanying drawings, describes a battery pack according to an embodiment of the present invention, the battery pack comprising individual batteries according to the above embodiments of the present invention.

[0103] According to the battery pack of the present invention, by utilizing the individual battery cells of the above embodiment of the present invention, the thickened portion 220 on the bottom shell 200 is connected to the support portion 120 on the cover plate 100, and the dimensional relationship between the thickened portion 220 and the support portion 120 is further designed, which can improve the welding strength and welding yield, and can take into account the battery capacity and overall weight, improve the overall structural strength, and make the structural stability of the individual battery cells higher, thereby improving the safety of the battery pack.

[0104] The following description, with reference to the accompanying drawings, describes an electrical appliance according to an embodiment of the present invention.

[0105] The electrical equipment includes a single battery cell or a battery pack according to the above embodiments of the present invention. The electrical equipment in the embodiments of the present invention can be a vehicle, but is not limited thereto.

[0106] According to the embodiments of the present invention, by utilizing the individual battery or battery pack of the above embodiments of the present invention, the individual battery has higher structural stability and the battery pack has higher safety, thereby improving the electrical safety of the electrical equipment.

[0107] The battery casing 1, individual battery, battery pack, and other components and operations of the electrical equipment according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0108] In the description of this specification, references to terms such as "specific embodiment" and "specific example" refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0109] Although embodiments of the present invention 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 the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery housing (1) characterized in that, include: Cover plate (100), the cover plate (100) is provided with a support portion (120) extending in the circumferential direction. The bottom shell (200) is supported by the support part (120) at the end of the bottom shell (200) in the length direction, and the bottom shell (200) includes a main body part (210) and a thickened part (220), the thickened part (220) is provided at the end of the main body part (210), and the thickened part (220) is connected to the support part (120); The thickness of the main body (210) is T1, the thickness of the thickened part (220) is T2, and T1 and T2 satisfy: T1 < T2; Along the length of the bottom shell (200), the size of the support part (120) is L1, the size of the thickened part (220) is L2, and L1 and L2 satisfy: 1.2×L1≤L2≤5×L1.

2. The battery housing (1) according to claim 1, characterized in that T1 and T2 satisfy: 1.2×T1≤T2≤2.5×T1.

3. The battery housing (1) according to claim 1, characterized in that The bottom shell (200) includes a plurality of side edges (230) connected end to end, and the plurality of side edges (230) include: Two first side edges (231) are arranged opposite to each other; Two second side edges (232) are arranged opposite each other, and the two second side edges (232) and the two first side edges (231) are alternately connected; In the circumferential direction of the bottom shell (200), the size of the first side (231) is smaller than the size of the second side (232), and at least the first side (231) is provided with the thickened portion (220).

4. The battery housing (1) according to claim 3, characterized in that Both the first side (231) and the second side (232) are provided with the thickened portion (220), and the thickened portion (220) extends in a ring shape along the circumference of the bottom shell (200).

5. The battery housing (1) according to claim 3, characterized in that The thickened portion (220) is provided on the two first side edges (231); or, The thickened portion (220) is provided on one of the two first side edges (231).

6. The battery housing (1) according to claim 3, characterized in that The multiple sides (230) are provided with the thickened portion (220), and the thickness of the thickened portion (220) of the multiple sides (230) is the same, and the size of the thickened portion (220) of the multiple sides (230) is the same along the length direction of the bottom shell (200).

7. The battery housing (1) according to claim 1, characterized in that The outer side of the thickened portion (220) is flush with the outer side of the main body portion (210), and the inner side of the thickened portion (220) protrudes from the inner side of the main body portion (210).

8. The battery housing (1) according to claim 1, characterized in that The thickened portions (220) are multiple and located at opposite ends of the main body portion (210), and the cover plates (100) are multiple and respectively connected to opposite ends of the bottom shell (200).

9. A single cell characterized by, include: Battery casing (1) according to any one of claims 1-8; The electrode core is disposed inside the battery casing (1).

10. The cell according to claim 9, wherein Along the length direction of the pole core, one end of the thickened portion (220) adjacent to the pole core is spaced apart from the pole core.

11. A battery pack, characterized by, Includes the single-cell battery according to claim 9 or 10.

12. An electrical appliance, characterized in that, The single cell according to claim 9 or 10 or the battery pack according to claim 11. The single cell according to claim 9 or 10 or the battery pack according to claim 11.

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