Pole, shell and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a pole column, a shell and a battery, the pole column is arranged on the shell wall of the battery shell and comprises a column body and a connecting piece, the column body comprises an external connecting part, a limiting part and an internal connecting part which are sequentially connected in the first direction, the external connecting part is clamped on the outer side of the shell, the limiting part penetrates through the shell wall, the connecting piece is arranged in the shell, and the internal connecting part is arranged in the shell. And the connecting sheet is connected with the inner connecting part. The limiting part comprises a plurality of limiting side walls which are sequentially connected end to end, and one of the limiting side walls is a limiting plane parallel to the first direction. According to the pole, the shell and the battery provided by the invention, the friction force and the constraining force between the pole and the battery cover plate are greatly increased, so that the pole is effectively prevented from rotating relative to the battery cover plate, and the stability of the internal structure of the battery is ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode post, a casing, and a battery. Background Technology

[0002] In the field of battery technology, battery performance and safety are of paramount importance. As a key component of the battery, the assembly stability between the casing and the terminals directly affects the overall battery performance. Currently, most common battery terminals adopt a cylindrical structure. When assembling cylindrical terminals into the casing, the terminals are typically passed sequentially through mounting holes in the lower plastic component, sealing ring, top cover, and upper plastic component. Then, through injection molding, the upper plastic component, top cover, lower plastic component, sealing ring, and terminal are connected as a single unit.

[0003] However, during the assembly of individual battery cells into modules, batteries are often subjected to various external forces, with torsional forces being particularly common. Due to the inherent structural characteristics of cylindrical terminals, they are prone to relative rotation with the casing when subjected to torsional forces. On the one hand, this can compromise the original seal of the casing, leading to a risk of electrolyte leakage and affecting the battery's charge and discharge performance, potentially even causing short circuits and other safety hazards. On the other hand, the relative rotation between the terminals and the cover plate reduces the overall strength of the casing, making the battery more susceptible to damage from external impacts or vibrations, failing to effectively protect core components such as the electrodes inside the battery, and significantly shortening the battery's lifespan and reliability. Furthermore, it can easily affect the connection stability between external connectors (such as busbars and wires) and the terminals, even leading to open circuits, loose connections, and poor contact. Utility Model Content

[0004] The purpose of this application is to provide an electrode post, a casing, and a battery to address, to some extent, the technical problems in the prior art where, due to the inherent structural characteristics of cylindrical electrodes, they are prone to relative rotation with the casing when subjected to torsional forces. On one hand, this can compromise the original sealing of the casing, leading to a risk of electrolyte leakage from the battery, thus affecting the battery's charge and discharge performance and potentially causing safety hazards such as short circuits. On the other hand, the relative rotation between the electrode post and the cover plate also reduces the overall strength of the casing, making the battery more susceptible to damage from external impacts or vibrations, failing to effectively protect core components such as the electrodes inside the battery, and significantly shortening the battery's lifespan and reliability. Furthermore, it can easily affect the connection stability between external connectors (such as busbars, wires, etc.) and the electrode post, even leading to technical problems such as battery open circuits, loose connections, and poor contact.

[0005] According to a first aspect of this application, a terminal post is provided, disposed on the shell wall of a battery housing, including a post body and a connecting piece. The post body includes an outer part, a limiting part, and an inner part connected sequentially along a first direction. The outer part is engaged on the outside of the housing, the limiting part passes through the shell wall, and the connecting piece is disposed inside the housing and connected to the inner part.

[0006] The limiting part includes multiple limiting sidewalls connected end to end in sequence, one of which is a limiting plane parallel to the first direction.

[0007] Preferably, the limiting part is a polygonal column or a rounded polygonal column.

[0008] Preferably, it further includes a pressing part, which is disposed between the limiting part and the inner part;

[0009] And / or, the connecting piece is provided with a mating hole, and the connecting piece can be sleeved on the outside of the inner part through the mating hole.

[0010] Preferably, the pole is projected along the first direction onto a plane perpendicular to the first direction;

[0011] The projection of the outer part, the limiting part, the pressing part, and the inner part can sequentially cover the projection of the next part.

[0012] According to a second aspect of this application, a housing is provided, including the pole as described in any of the above-described technical solutions, and thus possesses all the beneficial technical effects of the pole, which will not be repeated here.

[0013] Specifically, the housing includes a cover plate and a housing body that can be snapped together, and the pole is disposed on the cover plate.

[0014] Preferably, it further includes an insulating component disposed between the cover plate and the pole post.

[0015] Preferably, the insulating component includes:

[0016] The first insulating ring includes a first segment, a second segment, and a third segment connected sequentially along the first direction. The first segment is arranged around the side wall of the outer part, the second segment is disposed between the cover plate and the outer part, and the third segment is disposed between the limiting part and the cover plate.

[0017] The second insulating ring is sleeved on the outside of the press-fit part and extends at least partially between the cover plate and the limiting part;

[0018] An insulating baffle is disposed between the connecting piece and the cover plate, and at least a portion of the insulating baffle is sleeved on the outside of the second insulating ring.

[0019] Preferably, the cover plate is provided with two terminals, one of which is a positive terminal and the other is a negative terminal;

[0020] The positive electrode post has a body that is made of one piece of aluminum, and the negative electrode post has a body that is made of one piece of copper-aluminum composite.

[0021] Preferably, the copper-aluminum composite component includes a copper layer and an aluminum layer, the copper layer covering one side of the aluminum layer in the first direction, and when the negative electrode post is disposed on the cover plate, when viewed from the inside of the cover plate, the portion of the negative electrode post body exposed by the cover plate is covered by the copper layer.

[0022] According to a third aspect of this application, a battery is provided, comprising the terminals and / or the housing as described in any of the above-described technical solutions, thus possessing all the beneficial technical effects of the terminals and housing, which will not be elaborated further here.

[0023] Compared with the prior art, the beneficial effects of this application are as follows:

[0024] The electrode post provided in this application comprises multiple sequentially connected limiting sidewalls, one of which is a plane parallel to a first direction. This unique non-circular structural design overcomes the drawback of traditional cylindrical electrode posts lacking effective constraint under torsional forces. When the battery is subjected to torsional forces during module assembly, the planar limiting sidewall can tightly fit with the corresponding limiting structure on the battery cover, greatly increasing the friction and constraint between the electrode post and the battery cover, thereby effectively preventing the electrode post from rotating relative to the battery cover and ensuring the stability of the battery's internal structure.

[0025] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific 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 from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the isometric structure of the pole post provided in an embodiment of this application;

[0028] Figure 2 This is a cross-sectional view of the positive electrode post provided in an embodiment of this application;

[0029] Figure 3 A cross-sectional view of the negative electrode post provided in an embodiment of this application;

[0030] Figure 4 A cross-sectional structural diagram of a battery provided in an embodiment of this application;

[0031] Figure 5 for Figure 4 A magnified structural diagram of the battery at point A is provided.

[0032] Figure 6 for Figure 4 A magnified schematic diagram of the battery at point B is provided.

[0033] Figure 7 This is an isometric structural diagram of the connecting piece provided in the embodiments of this application;

[0034] Figure 8 This is an isometric structural diagram of the battery provided in an embodiment of this application.

[0035] Figure label:

[0036] 1a-Positive terminal post; 1b-Negative terminal post; 101-Aluminum layer; 102-Copper layer; 11-External connection part; 12-Limiting part; 120-Limiting plane; 13-Pressing part; 14-Internal connection part; 15-Connecting piece; 151-Mating protrusion ring; 21-First insulating ring; 211-First segment; 212-Second segment; 213-Third segment; 22-Second insulating ring; 23-Insulating baffle; 3-Cover plate; 4-Shell body.

[0037] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed Implementation

[0038] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0039] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0040] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] The following reference Figures 1 to 8 The present application describes the terminal post, housing, and battery according to some embodiments thereof.

[0044] See Figures 1 to 8 As shown, an embodiment of the first aspect of this application provides an electrode post disposed on the shell wall of a battery casing, including a post body and a connecting piece 15. The post body includes an outer portion 11, a limiting portion 12, and an inner portion 14 connected sequentially along a first direction F1. The outer portion 11 is engaged with the outer side of the casing, the limiting portion 12 passes through the shell wall, and the connecting piece 15 is disposed inside the casing and connected to the inner portion 14. The limiting portion 12 includes multiple limiting sidewalls connected sequentially end to end, one of which is a limiting plane 120 parallel to the first direction F1.

[0045] The electrode post provided by the aforementioned technical features includes multiple sequentially connected limiting sidewalls via the limiting part 12, one of which is a plane parallel to the first direction F1. This special non-circular structural design overcomes the drawback of traditional cylindrical electrode posts lacking effective constraint when subjected to torsional forces. When the battery is subjected to torsional forces during module assembly, the planar limiting sidewall can fit tightly against the corresponding limiting structure on the shell wall, greatly increasing the friction and constraint force between the electrode post and the shell wall, thereby effectively preventing the electrode post from rotating relative to the shell wall and ensuring the stability of the battery's internal structure.

[0046] like Figures 4 to 6 and Figure 8As shown in the figure, F1 can be an example of the first direction F1 mentioned above. For ease of description, two directions perpendicular to the first direction F1 are defined as the second direction F2 and the third direction F3, respectively. F2 shown in the figure can be an example of the second direction F2 mentioned above, and F3 shown in the figure can be an example of the third direction F3 mentioned above.

[0047] Preferably, such as Figure 1 As shown in the figure, the limiting part 12 is an example of a rounded quadrilateral prism. In other words, the limiting part 12 has eight limiting sidewalls. Four of the eight limiting sidewalls are the limiting plane 120, and the other four are chamfered arc surfaces connecting two adjacent limiting planes 120.

[0048] However, it is not limited to this. As long as the anti-rotation property between the limiting part 12 and the shell wall can be guaranteed, the limiting part 12 can also be a polygonal prism (e.g., a triangular prism, a quadrilateral prism, a pentagonal prism, a hexagonal prism, etc.), a rounded polygonal prism (e.g., a rounded triangular prism, a rounded quadrilateral prism, a rounded pentagonal prism, a rounded hexagonal prism, etc.), or other irregularly shaped prisms (e.g., prisms with a D-shaped, waist-shaped, pentagonal, or multi-pointed star cross-section).

[0049] Preferably, such as Figures 1 to 6 As shown, the aforementioned pole post may also include a press-fitting part 13, which may be disposed between the limiting part 12 and the inner connection part 14 to facilitate the installation and fixation of the aforementioned pole post.

[0050] Preferably, such as Figures 5 to 7 As shown, the connecting piece 15 may be provided with a mating hole, and the connecting piece 15 can be sleeved on the outside of the inner part 14 through the mating hole to facilitate the connection between the connecting piece 15 and the inner part 14.

[0051] Preferably, such as Figures 5 to 7 As shown, the connecting piece 15 may be provided with a mating protrusion 151, which surrounds the mating hole and protrudes from the connecting piece 15 toward the side facing the column body. Figure 5 and Figure 6 As shown, on the one hand, when the connecting piece 15 is mated with the column body, the top surface of the mating protrusion 151 can fit against the bottom surface of the pressing part 13 to achieve positioning between the connecting piece 15 and the column body; on the other hand, through the design of the mating protrusion 151, when the connecting piece 15 is mated with the column body, a gap can be formed between the part of the connecting piece 15 other than the mating protrusion 151 and the shell wall to avoid the connecting piece 15 contacting the shell wall and causing leakage of the shell wall.

[0052] Optionally, such as Figures 5 to 7 As shown, the aforementioned mating protrusion 151 can be a protrusion formed by stamping the connecting piece 15. In other words, a groove is formed on the side of the mating protrusion 151 opposite to the column body to reduce the weight of the connecting piece 15.

[0053] Preferably, such as Figures 1 to 6 As shown, when the terminal post is projected along the first direction F1 onto a plane perpendicular to the first direction F1, the projection of the first of the four parts—outer part 11, limiting part 12, pressing part 13, and inner part 14—can sequentially cover the projection of the next part. In other words, the projected areas of the outer part 11, limiting part 12, pressing part 13, and inner part 14 decrease sequentially. This facilitates the insertion of the terminal post into the housing and the assembly of the terminal post, greatly improving the assembly accuracy of the post body. On the other hand, because the projections of each part sequentially cover each other, sealing material (such as the insulating component described below) can be more precisely placed between the terminal post and the battery housing. For example, the area where the projection of the limiting part 12 is covered by the projection of the outer part 11 can be precisely filled with sealing material in the gaps of that area, ensuring that the sealing material fits tightly at the joints of each part, effectively preventing electrolyte leakage inside the battery and the intrusion of external air and moisture, improving the battery's sealing performance, and ensuring the stable conduct of the internal chemical reaction of the battery.

[0054] See Figures 4 to 8 The second aspect of this application also provides a housing that includes the pole as described in any of the above embodiments, and thus has all the beneficial technical effects of the pole, which will not be repeated here.

[0055] Specifically, such as Figure 8 As shown, the aforementioned housing may include a cover plate 3 and a housing body 4 that can be interlocked with each other, with the pole post disposed on the cover plate 3 to facilitate the assembly of the housing. However, it is not limited to this; the aforementioned pole post may also be disposed on the housing wall of the housing body 4.

[0056] Correspondingly, the cover plate 3 may be provided with a mounting hole that is adapted to the shape of the limiting part 12, so as to limit the position between the cover plate 3 and the pole post.

[0057] Preferably, such as Figure 5 and Figure 6 As shown, the housing may also include an insulating component, which may be disposed between the cover plate 3 and the pole post to achieve insulation and sealing between the cover plate 3 and the pole post.

[0058] Preferably, such as Figure 5 and Figure 6As shown, the aforementioned insulating assembly may include a first insulating ring 21. The first insulating ring 21 may include a first segment 211, a second segment 212, and a third segment 213 connected sequentially along a first direction F1. The first segment 211 surrounds the sidewall of the external connection portion 11. The second segment 212 is located between the cover plate 3 and the external connection portion 11. The third segment 213 is located between the limiting portion 12 and the cover plate 3. Thus, the first insulating ring 21, by surrounding the sidewall of the external connection portion 11 with the first segment 211, effectively isolates the external connection portion 11 from the surrounding environment, preventing accidental short circuits between the external connection portion 11 and other conductive components outside the battery casing. The second segment 212, located between the cover plate 3 and the external connection portion 11, avoids direct electrical contact between the external connection portion 11 and the battery cover plate 3, further ensuring insulation safety. The third segment 213, located between the limiting portion 12 and the cover plate 3, enhances the insulation performance at the connection between the terminal post and the cover plate 3, reducing the risk of leakage.

[0059] Preferably, such as Figure 5 and Figure 6 As shown, the above-mentioned insulating component may include a second insulating ring 22. The second insulating ring 22 may be sleeved on the outside of the press-fit part 13 and extend at least partially between the cover plate 3 and the limiting part 12. In this way, not only is the press-fit part 13 provided with insulating protection to prevent it from conducting with the surrounding metal parts, but a continuous insulating barrier is also formed at the critical part of the pole post. It works in conjunction with the third segment 213 of the first insulating ring 21 to comprehensively improve the insulation reliability between the pole post and the cover plate 3.

[0060] Preferably, such as Figure 5 and Figure 6 As shown, the above-mentioned insulating component may include an insulating baffle 23, which may be disposed between the connecting piece 15 and the cover plate 3, and at least a portion of the insulating baffle 23 may be sleeved on the outside of the second insulating ring 22. In this way, the current path between the connecting piece 15 and the cover plate 3 is effectively blocked, avoiding internal short circuits of the battery caused by contact between the connecting piece 15 and the cover plate 3, ensuring that the internal circuit of the battery operates according to the design path, and guaranteeing the normal operation of the battery.

[0061] Based on the above technical features, the insulation component is configured as a structure in which three parts, namely a first insulating ring 21, a second insulating ring 22, and an insulating baffle 23, are spliced ​​together. This not only ensures the comprehensive insulation and sealing between the pole and the cover plate 3, but also facilitates the assembly of the insulation component.

[0062] Preferably, such as Figure 4 and Figure 8 As shown, the cover plate 3 can be provided with two poles. The two poles can be arranged at intervals along the second direction F2 on the cover plate 3 to prevent the two poles from interfering with each other. One of the two poles can be the positive pole 1a and the other can be the negative pole 1b.

[0063] However, it is not limited to this. As not shown in the figure, the above-mentioned housing may also include two cover plates, which may be respectively covered on both sides of the housing body in the first direction. Each cover plate may be provided with a pole post. One of the two cover plates may be provided with the above-mentioned positive pole post, and the other of the two cover plates may be provided with the above-mentioned negative pole post.

[0064] Preferably, such as Figure 2 As shown, the main body of the positive electrode post 1a can be a one-piece molded aluminum part to facilitate welding with the positive electrode tab.

[0065] Preferably, such as Figure 3 As shown, the body of the negative electrode post 1b can be a one-piece molded copper-aluminum composite component. It should be noted that the copper-aluminum composite component can be made by stamping a copper-aluminum composite plate. The copper-aluminum composite plate is a material existing in the art and will not be described in detail here.

[0066] Preferably, such as Figure 3 , Figure 4 and Figure 6 As shown, the aforementioned copper-aluminum composite component may include a copper layer 102 and an aluminum layer 101. The copper layer 102 covers one side of the aluminum layer 101 in the first direction F1. When the negative electrode post 1b is disposed under the cover plate 3, viewed from the inside of the cover plate 3, the portion of the negative electrode post 1b exposed by the cover plate 3 is entirely covered by the copper layer 102. In other words, as shown... Figure 3 As shown, the outer surfaces of the inner connecting part 14 and the pressing part 13 of the negative electrode post 1b, as well as the bottom surface of the limiting part 12, are covered with the aforementioned copper layer 102 to facilitate welding to the negative electrode tab inside the housing.

[0067] An embodiment of the third aspect of this application also provides a battery comprising the terminals and / or the housing as described in any of the above embodiments, thus possessing all the beneficial technical effects of the terminals and housing, which will not be repeated here.

[0068] Preferably, the battery may further include an electrode assembly having a positive tab and a negative tab, wherein the positive tab can be welded to the inner portion 14 of the positive terminal 1a, and the negative tab can be welded to the negative terminal.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application.

Claims

1. An electrode post, characterized in that, The shell wall of the battery housing includes a column body and a connecting piece. The column body includes an outer part, a limiting part and an inner part connected in sequence along a first direction. The outer part is engaged on the outside of the housing, the limiting part passes through the shell wall, and the connecting piece is disposed inside the housing and connected to the inner part. The limiting part includes multiple limiting sidewalls connected end to end in sequence, one of which is a limiting plane parallel to the first direction.

2. The pole post according to claim 1, characterized in that, The limiting part is a polygonal column or a rounded polygonal column.

3. The pole post according to claim 1 or 2, characterized in that, It also includes a pressing part, which is disposed between the limiting part and the inner connecting part; And / or, the connecting piece is provided with a mating hole, and the connecting piece can be sleeved on the outside of the inner part through the mating hole.

4. The pole post according to claim 3, characterized in that, Project the pole along the first direction onto a plane perpendicular to the first direction; The projection of the outer part, the limiting part, the pressing part, and the inner part can sequentially cover the projection of the next part.

5. A housing, characterized in that, Includes the pole as described in claim 3 or 4; The housing includes a cover plate and a housing body that can be snapped together, and the pole is disposed on the cover plate.

6. The housing according to claim 5, characterized in that, It also includes an insulating component disposed between the cover plate and the pole post.

7. The housing according to claim 6, characterized in that, The insulating component includes: The first insulating ring includes a first segment, a second segment, and a third segment connected sequentially along the first direction. The first segment is arranged around the side wall of the outer part, the second segment is disposed between the cover plate and the outer part, and the third segment is disposed between the limiting part and the cover plate. The second insulating ring is sleeved on the outside of the press-fit part and extends at least partially between the cover plate and the limiting part; An insulating baffle is disposed between the connecting piece and the cover plate, and at least a portion of the insulating baffle is sleeved on the outside of the second insulating ring.

8. The housing according to claim 5, characterized in that, The cover plate is provided with two poles, one of which is a positive pole and the other is a negative pole; The positive electrode post has a body that is made of one piece of aluminum, and the negative electrode post has a body that is made of one piece of copper-aluminum composite.

9. The housing according to claim 8, characterized in that, The copper-aluminum composite component includes a copper layer and an aluminum layer. The copper layer covers one side of the aluminum layer in the first direction. When the negative electrode post is disposed on the cover plate, when viewed from the inside of the cover plate, the portion of the negative electrode post body exposed by the cover plate is covered by the copper layer.

10. A battery, characterized in that, The pole includes any one of claims 1 to 9.

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