Shell assembly and battery

Abstract

The utility model discloses a shell assembly and a battery. The shell assembly comprises a shell, the shell is provided with an inner surface and an outer surface, a cavity is formed in the inner surface, a first groove is formed in the outer surface, and the cavity and the groove are communicated through a through hole; the pole comprises a body part and a first protruding part, the first protruding part is connected to the body part and protrudes relative to the body part, the body part penetrates through the through hole, and the first protruding part is contained in the first groove; the maximum size of the face, away from the cavity, of the first protruding part protruding out of the first groove is smaller than or equal to 0.3 mm. The shell assembly disclosed by the utility model can improve the energy density and the safety performance of the battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to shell assembly and battery. BACKGROUND

[0002] In modern battery technology, the design of the steel shell pole and the cooperation between the head shell have important influence on the overall performance, safety and space utilization of the battery. The traditional steel shell pole design has a significant height difference, that is, the protruding structure is arranged in the inner and outer of the pole. This design not only meets the needs of the connection of the battery cell to a certain extent, but also brings several adverse factors, especially in the space utilization and safety of the battery cell.

[0003] The protruding structure in the traditional design occupies additional space, which directly reduces the effective volume available for accommodating the battery cell. For modern batteries that pursue high energy density, every cubic millimeter of space is crucial. Therefore, the space waste caused by this height difference not only reduces the energy density of the battery pack, but also limits the further improvement of the battery capacity. In addition, in the case of multiple battery cell combinations, these protrusions around each battery cell will accumulate, causing more significant space loss, thereby affecting the design flexibility and compactness of the entire battery module.

[0004] In addition to the problem of space utilization, the height difference between the steel shell pole and the head shell also constitutes a potential safety risk when the battery cell falls or is subjected to external impact. When the battery is subjected to accidental impact, the protruding part on the pole is easy to become a stress concentration point, so that the battery cell is more likely to deform when subjected to a large impact force. The deformation of the battery cell not only may cause internal short circuit, electrolyte leakage and other faults, but also increases the risk of fire and even explosion, which seriously threatens the safety of the user. SUMMARY

[0005] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model provides a shell assembly, which can improve the energy density and safety performance of the battery.

[0006] The utility model further provides a battery.

[0007] The shell assembly according to the embodiment of the first aspect of the utility model comprises:

[0008] The shell has an inner surface and an outer surface, the inner surface forms a cavity, the outer surface is provided with a first groove, and the cavity and the groove are communicated through a through hole;

[0009] The pole post includes a body portion and a first protruding portion connected to the body portion and protruding relative to the body portion, the body portion is provided through the through hole, the first protruding portion is accommodated in the first recess, and the protruding dimension of the side of the first protruding portion away from the cavity from the maximum dimension of the first recess is less than or equal to 0.3 mm.

[0010] According to the shell assembly of the first aspect of the embodiments of the present application, at least the following beneficial effects can be achieved: the energy density and safety performance of the battery can be improved.

[0011] In the present application, the shell assembly includes a shell and a pole post, the pole post is installed in the shell, the shell is formed with a first recess on the outer surface, the shell is formed with a cavity on the inner surface, and the cavity is used to accommodate the battery cell. The shell is also provided with a through hole which communicates the first recess and the cavity. The cross section of the pole post of the shell assembly is T-shaped, the first protruding portion is the head of the pole post, the body portion is the columnar portion of the pole post, the head is accommodated in the first recess, the columnar portion is accommodated in the through hole, and the head of the pole post is arranged in a manner of not protruding from the first recess or slightly protruding from the first recess (i.e. the protruding dimension is less than or equal to 0.3 mm). Therefore, the outer surface of the pole post (i.e. the side away from the cavity) does not protrude or slightly protrudes from the outer surface of the shell, which improves the space utilization of the battery cell and the battery, and improves the energy density of the battery cell.

[0012] Compared with the battery design of the pole post of the related art which protrudes from the outer surface of the shell by a large dimension, the pole post of the present application does not occupy much additional space and does not limit the layout flexibility of the internal components of the battery. By greatly reducing the dimension of the protruding portion of the pole post, more space can be released for accommodating the battery cell or other important components, thereby increasing the energy density and total capacity of the battery. In addition, the arrangement of the pole post of the present application which does not protrude or slightly protrudes from the shell can greatly reduce the risk of deformation of the battery cell when the battery is subjected to external impact, thereby increasing the safety of the battery. Therefore, the shell assembly of the present application can improve the energy density and safety performance of the battery.

[0013] According to some embodiments of the present application, a connecting piece is further included, the connecting piece is arranged in the cavity, the connecting piece is electrically connected with the pole post, and the connecting piece is used to be electrically connected with the battery cell.

[0014] According to some embodiments of the present application, an insulating coating is further included, the insulating coating is arranged between the connecting piece and the shell.

[0015] According to some embodiments of the present application, the inner surface is provided with a second groove, the second groove is communicated with the first groove through the through hole; the pole post further comprises a second protruding part, the first protruding part and the second protruding part are connected to two ends of the body part respectively, and the second protruding part protrudes relative to the body part, and the second protruding part is accommodated in the second groove.

[0016] According to some embodiments of the present application, further comprising a connecting piece, the connecting piece is electrically connected with the pole post, the connecting piece is used for electrically connecting with the electric core, and the connecting piece is accommodated in the second groove.

[0017] According to some embodiments of the present application, an insulating coating is arranged between the connecting piece and the second groove.

[0018] According to some embodiments of the present application, the connecting piece comprises a body part and a third protruding part, the third protruding part is connected to the body part, the third protruding part protrudes relative to the body part, the body part and the third protruding part form a connecting groove, and the second protruding part is arranged in the connecting groove.

[0019] According to some embodiments of the present application, the second groove has a first groove part and a second groove part, the third protruding part is accommodated in the first groove part, and the body part is accommodated in the second groove part.

[0020] According to some embodiments of the present application, further comprising an insulating coating, the insulating coating is arranged between the pole post and the shell.

[0021] The battery according to the embodiments of the second aspect of the present application comprises the shell assembly according to any one of the above.

[0022] The battery according to the embodiments of the second aspect of the present application has at least the following beneficial effects: the energy density and safety performance of the battery can be improved.

[0023] In the present application, the shell assembly comprises a shell and a pole post, the pole post is installed in the shell, the shell is formed with a first groove on an outer surface, the shell is formed with a cavity on an inner surface, and the cavity is used for accommodating an electric core. The shell is further provided with a through hole, and the through hole communicates the first groove and the cavity. The pole post of the shell assembly has a T-shaped cross section, a first protruding part is a head part of the pole post, a body part is a columnar part of the pole post, the head part is accommodated in the first groove, the columnar part is accommodated in the through hole, and the head part of the pole post is arranged in a manner of not protruding from the first groove or slightly protruding from the first groove (i.e. the maximum protruding size is less than or equal to 0.3 mm). Therefore, the outer surface of the pole post (i.e. the surface away from the cavity) does not protrude from or slightly protrudes from the outer surface of the shell, the space utilization of the electric core and the battery is improved, and the energy density of the electric core is improved.

[0024] Compared with the battery design of the prior art in which the pole post protrudes from the outer surface of the shell by a large size, the pole post of the present application does not occupy much extra space and does not limit the layout flexibility of the internal components of the battery. By greatly reducing the size of the protruding part of the pole post, more space can be released for accommodating the battery cell or other important components, thereby increasing the energy density and total capacity of the battery. In addition, the pole post of the present application is not protruding or slightly protruding from the shell, which can greatly reduce the risk of deformation of the battery cell when the battery is subjected to external impact, thereby increasing the safety of the battery. Therefore, the shell assembly of the present application can improve the energy density and safety performance of the battery.

[0025] Additional aspects and advantages of the present application will be partially given in the following description, some of which will become apparent from the following description, or will be understood by those skilled in the art through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in conjunction with the drawings and examples, in which:

[0027] Figure 1 is a schematic view of the first embodiment of the shell assembly of the present application;

[0028] Figure 2 is a schematic view of the shell assembly of the present application without showing the pole post.

[0029] REFERENCE NUMERALS:

[0030] shell 100; inner surface 101; outer surface 102; cavity 103; through hole 104; first recess 110; second recess 120; first slot portion 121; second slot portion 122; pole post 200; body portion 210; first protruding portion 220; second protruding portion 230; connecting piece 300; main body portion 310; third protruding portion 320; insulating coating 400. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0032] In the description of the utility model, it is understood that the direction description, such as the direction or position relation of up, down, front, back, left, right and the like indicated is the direction or position relation based on the drawing shown, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model.

[0033] In the description of the utility model, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number.If the first, second is described, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0034] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0035] In the description of the utility model, the description of reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] In the field of battery technology today, the design fit between the steel shell pole and the head shell has a crucial influence on the overall performance, safety and space utilization of the battery. The traditional steel shell pole design usually includes convex structures existing inside and outside, forming a significant height difference. Although this design meets the needs of electrical connection to some extent, it also introduces a series of problems, especially in the space utilization efficiency and safety of the battery cell.

[0037] In traditional designs, the protrusion on the pole occupies extra space, directly reducing the effective volume available to accommodate the battery cell, resulting in a decrease in the energy density of the battery cell. Therefore, the space waste caused by the height difference not only reduces the energy density of the battery pack, but also hinders the further improvement of the battery capacity. Especially in the case of multiple battery cell combinations, these protrusions scattered everywhere will accumulate, resulting in more significant space loss, thereby affecting the design flexibility and compactness of the entire battery module, limiting the optimization potential of the battery system.

[0038] In addition, the height difference between the steel shell pole and the head shell also poses a potential safety risk when the battery cell encounters a drop or external impact. When the battery is accidentally hit, the protruding part on the pole is prone to become a stress concentration area, making the battery cell more prone to deformation when subjected to a larger impact force. Battery cell deformation can cause internal short circuits, electrolyte leaks, and other malfunctions, and even increase the risk of fire or explosion, which poses a serious threat to user safety.

[0039] Based on the above problems, the shell assembly can at least solve the above problems to some extent.

[0040] Reference Figure 1 , Figure 2 According to the shell 100 assembly of the first aspect of the present application, the shell 100 has an inner surface 101 and an outer surface 102, the inner surface 101 is formed with a cavity 103, the outer surface 102 is provided with a first groove 110, and the cavity 103 and the groove are communicated through a through hole 104. The pole 200 includes a body portion 210 and a first protruding portion 220, the first protruding portion 220 is connected to the body portion 210 and protrudes relative to the body portion 210, the body portion 210 is provided with a through hole 104, the first protruding portion 220 is accommodated in the first groove 110, and the maximum size of the side of the first protruding portion 220 away from the cavity 103 protruding from the first groove 110 is less than or equal to 0.3mm.

[0041] According to the shell 100 assembly of the first aspect of the present application, at least the following beneficial effects can be achieved: the energy density and safety performance of the battery can be improved.

[0042] In the present application, the shell 100 assembly includes a shell 100 and a pole 200 installed in the shell 100, and the shell 100 is formed with a first groove 110 on the outer surface 102 and a cavity 103 on the inner surface 101 for accommodating the battery cell. The shell 100 is also provided with a through hole 104 communicating the first groove 110 and the cavity 103. The cross section of the pole 200 of the shell 100 assembly is T-shaped, the first protruding part 220 is the head of the pole 200, and the body part 210 is the columnar part of the pole 200. The head is accommodated in the first groove 110, the columnar part is accommodated in the through hole 104, and the head of the pole 200 is arranged in a manner that does not protrude or slightly protrudes from the first groove 110 (i.e. the maximum protruding size is less than or equal to 0.3mm). Thus, the upper surface of the pole 200 (i.e. the side away from the cavity 103) does not protrude or slightly protrudes from the outer surface 102 of the shell 100, improving the space utilization of the battery cell and the battery, and thus increasing the energy density of the battery cell.

[0043] Compared with the battery design of the related art pole 200 protruding from the shell 100 outer surface 102 by a large size, the pole 200 of the present application does not occupy much additional space outside the shell 100, and does not limit the layout flexibility of the internal components of the battery. By reducing the size of the protruding part of the pole 200 to a size of no more than 0.3mm beyond the outer surface 102 of the shell 100, more space can be released for accommodating the battery cell or other important components, thereby increasing the energy density and total capacity of the battery.

[0044] On the one hand, the pole 200 of the present application can be arranged without protruding from the outer surface 102 of the shell 100, which can avoid deformation of the battery cell when the battery is subjected to external impact, thereby increasing the safety of the battery. Specifically, during vehicle driving or when the battery is accidentally dropped, the traditional protruding pole 200 is easy to become a stress concentration point, increasing the possibility of deformation of the battery cell. However, the pole 200 of the present application does not protrude from the outer surface 102 of the shell 100, i.e. it is flush with the outer surface 102 or embedded, which can effectively disperse the impact force and reduce the direct damage to the battery cell, thereby reducing the risk of internal short circuit, electrolyte leakage and even explosion, and improving the safety performance of the battery. Secondly, the non-protruding design of the present application also helps to prevent surface scratches or wear caused by impact or friction during transportation and use, further protecting the integrity and functionality of the battery.

[0045] In another aspect, the pole 200 of the present application can also protrude from the outer surface 102 of the shell 100. When the pole 200 can also protrude from the outer surface 102 of the shell 100, the size of the upper surface of the pole 200 protruding from the outer surface 102 of the shell 100 is less than or equal to 0.3mm. Exemplarily, the size of the upper surface of the pole 200 protruding from the outer surface 102 of the shell 100 can be 0.3mm, 0.25mm, 0.2mm, 0.15mm and 0.1mm, etc. In this way, the pole 200 slightly protrudes from the outer surface 102 of the shell 100, neither reduces the energy density of the battery cell, nor causes the size of the pole 200 outside the shell 100 to be too large, so that the battery cell is damaged when the battery falls. Compared with the battery design of the related art pole 200 protruding from the shell 100 with a large size, the energy density and safety performance of the battery are improved.

[0046] According to some embodiments of the present application, the connecting piece 300 is arranged in the cavity 103, and the connecting piece 300 is electrically connected with the pole 200, and the connecting piece 300 is used to electrically connect with the battery cell. By arranging the connecting piece 300, good electrical connection inside the battery can be achieved. The connecting piece 300 is connected with the tab of the battery cell by welding or other means, so as to ensure that the current can flow from the battery cell to the circuit outside the battery, improve the utilization rate of the battery cell in the height direction, and further improve the energy density of the battery cell. At the same time, the connecting piece can also reduce the bending and compression of the tab during the assembly process of the battery cell, reduce the risk of short circuit, and reduce the internal resistance, improve the heat generation of the battery cell in the cycle and rate discharge process, and improve the life and performance of the battery cell. In addition, the connecting piece 300 of the present application is arranged in the second groove 120 (described later), and is formed as an embedded connecting piece, which can avoid the bare battery cell from being squeezed during the assembly process, and improve the rate. In the process of safety test such as falling, the traditional internal protruding structure may impact the battery cell and cause damage to the battery cell, while the embedded connecting piece of the present application can avoid the protrusion inside the shell connecting the battery cell, avoid the internal protrusion impacting the battery cell, reduce the risk of internal short circuit and increased internal resistance, and further improve the life and safety performance of the battery cell.

[0047] In the battery design, the reliable connection between the pole 200 and the connecting piece 300 is crucial to improve the overall performance, safety and reliability of the battery. Reliable electrical connection also enhances safety, preventing short circuit risk due to loose or poor contact, especially under high voltage or high current conditions. Good connection helps to evenly distribute current, avoiding local overheating, thereby reducing the risk of thermal runaway and ensuring user safety. In addition, by arranging the connecting piece 300, the strength of the battery can also be enhanced, so that it can better resist external vibration and impact, maintain long-term stability, and be suitable for various complex environment applications.

[0048] Reference Figure 1According to some embodiments of the present application, the insulating coating 400 is provided between the connecting piece 300 and the shell 100. Specifically, in the present application, the insulating coating 400 is provided between the connecting piece 300 and the shell 100 to insulate the connecting piece 300 and the shell 100. On the other hand, the insulating coating 400 is not provided between the pole 200 and the connecting piece 300 because good electrical connection is required for conduction. Exemplarily, the insulating coating 400 of the present application is formed of a high molecular material, which forms an insulating high molecular glue between the connecting piece 300 and the shell 100, and is provided between at least one of the pole 200 and the shell 100 and at least one of the connecting piece 300 and the shell 100 by coating, spraying or the like.

[0049] The insulating coating 400 can also be provided between the pole 200 and the shell 100, and the provision manner is the same as that between the connecting piece 300 and the shell 100. Thus, compared with the related art which adopts a PFA (Perfluoroalkoxy Polymer, a full name of which is perfluoroalkoxy vinyl ether copolymer, which is a fluoroplastic with excellent performance) layer and is provided between the pole 200 and the shell 100 and between the connecting piece 300 and the shell 100 by extrusion, the insulating coating 400 of the present application has a thinner thickness, can save the internal space of the battery, and further improves the energy density of the battery. In addition, because the insulating coating 400 of the present application is an insulating high molecular glue layer, the sealing effect of the present application is better than that of the conventional PFA layer extrusion sealing means.

[0050] According to some embodiments of the present application, the inner surface 101 is provided with a second groove 120, and the second groove 120 is communicated with the first groove 110 through the through hole 104; the pole column 200 further comprises a second protruding part 230, the first protruding part 220 and the second protruding part 230 are respectively connected to two ends of the body part 210, and the second protruding part 230 protrudes relative to the body part 210, and the second protruding part 230 is accommodated in the second groove 120. Specifically, the pole column 200 of the related art not only has a protrusion on the outer surface 102 of the shell 100, but also forms a protruding structure in the interior of the battery due to the connection of the connecting piece and the tail end of the pole column 200, which seriously occupies the internal space of the battery, thereby reducing the energy density of the battery. Therefore, in order to solve the problem, the present application releases the space, and the second groove 120 is arranged on the inner surface 101 of the shell 100, the second groove 120 is arranged corresponding to the first groove 110, and the first groove 110 and the second groove 120 are communicated through the through hole 104. When the pole column 200 is installed in the shell 100, the first protruding part 220 of the pole column 200 is accommodated in the first groove 110, the body part 210 of the pole column 200 is accommodated in the through hole 104, and the tail end (i.e. the second protruding part 230) of the pole column 200 is accommodated in the second groove 120.

[0051] Therefore, in the present application, the overall structure of the pole column 200 is accommodated in the slot (i.e. the first groove 110, the through hole 104 and the second groove 120) of the shell 100, the upper surface of the pole column 200 is not protruded or slightly protruded from the outer surface 102 of the shell 100, and the lower surface of the pole column 200 is not protruded from the inner surface 101 of the shell 100, so as to form the shell 100 without protruding structure on the outer surface 102 and the inner surface 101, increase the available space in the battery, improve the energy density of the battery, and also improve the safety performance of the battery.

[0052] In addition, by arranging the second protruding part 230 for connecting with the connecting piece 300, the pole column 200 is formed in an I-shaped structure, which can ensure reliable electrical connection in the battery cell, increase the connection strength between the pole column 200 and the connecting piece 300, enhance the safety of the battery, and prevent the risk of short circuit caused by looseness or poor contact of the pole column 200 or the connecting piece 300.

[0053] According to some embodiments of the utility model, still include connecting piece 300, connecting piece 300 with pole 200 electricity is connected, connecting piece 300 is used for and electric connection, connecting piece 300 is housed in second recess 120. For further saving battery internal space, in addition to the pole 200 whole embedding in the shell 100, to make it in thickness direction not exceed the outer surface 102 and inner surface 101 of shell 100, still can set up connecting piece 300 in second recess 120, to further reduce the space that connecting piece 300 occupies in battery interior. Therefore, in the application, by also setting up connecting piece 300 in second recess 120, and make connecting piece 300 not protrude or slightly protrude in second accommodating groove setting, it can further save battery internal space, improve the energy density of battery.

[0054] According to some embodiments of the utility model, the insulating coating 400 is arranged between the connecting piece 300 and the second recess 120. Specifically, the insulating coating 400 of the application is formed of a high molecular material, which forms an insulating high molecular colloid between the connecting piece 300 and the second recess 120 and is arranged between at least one of the connecting piece 300 and the second recess 120 by coating, spraying or the like. Compared with the related art of arranging an insulating piece by extrusion, the insulating coating 400 of the application has a thinner thickness, can save the internal space of the battery, and further improve the energy density of the battery. In addition, since the insulating coating 400 of the application is an insulating high molecular colloid layer, the sealing effect of the application is better than that of the conventional PFA layer extrusion sealing means.

[0055] According to some embodiments of the utility model, the connecting piece 300 includes a main body portion 310 and a third protruding portion 320, the third protruding portion 320 is connected to the main body portion 310, the third protruding portion 320 protrudes relative to the main body portion 310, the main body portion 310 and the third protruding portion 320 form a connecting groove, and the second protruding portion 230 is arranged in the connecting groove. In the related art, the connecting piece is a flat sheet structure, which is arranged on the inner surface 101 of the shell 100 and connected to the pole 200. However, this thickness direction stacking method has a relatively thick connecting structure, which occupies more internal space of the battery. The application sets the connecting piece 300 to include the main body portion 310 and the third protruding portion 320 protruding from the main body portion 310, and the third protruding portion 320 is crimped to the second protruding portion 230 of the pole 200, which can further reduce the thickness of the connecting structure, release the internal space of the battery, and improve the energy density of the battery. In addition, since the connecting piece 300 and the pole 200 are connected by crimping, the connection strength between the connecting piece 300 and the pole 200 can be further improved, and the overall mechanical strength and impact resistance of the battery are improved.

[0056] Reference Figure 2According to some embodiments of the present application, the second groove 120 has a first groove portion 121 and a second groove portion 122, the third protruding portion 320 is accommodated in the first groove portion 121, and the main body portion 310 is accommodated in the second groove portion 122. Specifically, since the connecting piece 300 is formed to include the main body portion 310 and the third protruding portion 320 protruding relative to the main body portion 310, under the premise of ensuring to increase the internal space of the battery as much as possible, in order to increase the mechanical strength of the shell 100, the second groove 120 can be formed to have the first groove portion 121 and the second groove portion 122, the third protruding portion 320 of the connecting piece 300 is accommodated in the first groove portion 121, and the main body portion 310 of the connecting piece 300 is accommodated in the second groove portion 122, thereby realizing the maximum utilization of the internal space of the battery, so as to form a battery structure which is compact in structure, high in energy density and high in safety performance.

[0057] The battery according to the second aspect of the embodiments of the present application comprises the shell 100 assembly of any one of the above.

[0058] The battery according to the second aspect of the embodiments of the present application has at least the following beneficial effects: the energy density and safety performance of the battery can be improved.

[0059] Compared with the battery design of the related art in which the pole 200 protrudes from the outer surface 102 of the shell 100 by a large size, the pole 200 of the present application does not occupy much additional space outside the shell, and does not limit the layout flexibility of the internal components of the battery. By reducing the size of the protruding part of the pole 200 to be limited to 0.3mm or less beyond the outer surface 102 of the shell 100, more space can be released for accommodating the battery cell or other important components, thereby increasing the energy density and total capacity of the battery.

[0060] On the one hand, the pole 200 of the present application can be arranged without protruding from the outer surface 102 of the shell 100, which can avoid the deformation of the battery cell when the battery is subjected to external impact, thereby increasing the safety of the battery. Specifically, during the driving of the vehicle or when the battery is accidentally dropped, the traditional protruding pole 200 is easy to become a stress concentration point, which increases the possibility of deformation of the battery cell. However, the pole 200 of the present application does not protrude from the outer surface 102 of the shell 100, i.e. it is arranged flush with the outer surface 102 or embedded, which can effectively disperse the impact force and reduce the direct damage to the battery cell, thereby reducing the risk of safety accidents such as internal short circuit, electrolyte leakage and explosion, and improving the safety performance of the battery. Secondly, the non-protruding design of the present application also helps to prevent surface scratches or wear caused by impact or friction during transportation and use, thereby further protecting the integrity and functionality of the battery.

[0061] In another aspect, the pole 200 of the application can also protrude from the outer surface 102 of the shell 100, and when the pole 200 also protrudes from the outer surface 102 of the shell 100, the size of the upper surface of the pole 200 protruding from the outer surface 102 of the shell 100 is less than or equal to 0.3 mm. Exemplarily, the size of the upper surface of the pole 200 protruding from the outer surface 102 of the shell 100 can be 0.3 mm, 0.25 mm, 0.2 mm, 0.15 mm, 0.1 mm, etc. In this way, the pole 200 slightly protrudes from the outer surface 102 of the shell 100, neither reduces the energy density of the battery cell, nor causes the size of the pole 200 outside the shell 100 to be too large to cause the battery cell to be squeezed and damaged when the battery falls. Compared with the battery design of the pole 200 of the related art protruding from the shell 100 by a large size, the energy density and safety performance of the battery are improved.

[0062] The embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the application. In addition, the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A housing assembly characterized by, The shell has an inner surface and an outer surface, the inner surface is formed with a chamber, and the outer surface is provided with a first groove, the chamber and the groove are communicated through a through hole; The pole post includes a body part and a first protruding part, the first protruding part is connected to the body part and protrudes relative to the body part, the body part penetrates the through hole, the first protruding part is accommodated in the first groove, and the maximum dimension of the side of the first protruding part away from the chamber protruding out of the first groove is less than or equal to 0.3 mm. Further comprising a connecting piece arranged in the chamber, the connecting piece is electrically connected with the pole post, and the connecting piece is used to be electrically connected with an electric core.

2. The housing assembly of claim 1, wherein, Further comprising an insulating coating arranged between the connecting piece and the shell.

3. The housing assembly of claim 2, wherein, The inner surface is provided with a second groove, the second groove is communicated with the first groove through the through hole; the pole post further includes a second protruding part, the first protruding part and the second protruding part are respectively connected to two ends of the body part, and the second protruding part protrudes relative to the body part, and the second protruding part is accommodated in the second groove.

4. The housing assembly of claim 1, wherein, Further comprising a connecting piece arranged in the chamber, the connecting piece is electrically connected with the pole post, and the connecting piece is used to be electrically connected with an electric core.

5. The housing assembly of claim 4, wherein, Further comprising an insulating coating arranged between the connecting piece and the shell.

6. The housing assembly of claim 5, wherein, The connecting piece includes a main body part and a third protruding part, the third protruding part is connected around the main body part, the third protruding part protrudes relative to the main body part, the main body part and the third protruding part form a connecting groove, and the second protruding part is arranged in the connecting groove.

7. The housing assembly of claim 5, wherein, The second groove has a first groove part and a second groove part, the third protruding part is accommodated in the first groove part, and the main body part is accommodated in the second groove part.

8. The housing assembly of claim 7, wherein, Further comprising an insulating coating arranged between the pole post and the shell.

9. The housing assembly of claim 1, wherein, The shell assembly comprises the shell assembly according to any one of claims 1 to 9.

10. A battery characterized by The shell assembly comprises the shell assembly according to any one of claims 1 to 9.

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