Composite pole, battery and electric equipment
By forming a mortise and tenon structure between the lithium battery poles, the safety hazard caused by the fracture of the copper-aluminum interface is solved, the mechanical connection strength is improved, and the stability of the battery system is ensured.
Patent Information
- Application Number
- CN202422061941.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The copper-aluminum interface of the existing lithium battery negative electrode is prone to abnormal fracture, resulting in disconnection of the entire vehicle circuit, posing a safety hazard and lacking an effective detection method.
A composite pole design is adopted. By forming a mortise and tenon structure at the joint surface of the first pole and the second pole, the plastic deformation characteristics of the first pole are utilized to fill the cavity during welding, forming a riveting effect, improving the mechanical connection strength and maintaining the connection.
It effectively avoids the disconnection of the vehicle circuit due to the fracture of the joint surface, improves the mechanical connection strength and reduces safety hazards.
Smart Images
Figure CN223401854U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a composite pole, a battery, and an electrical device. Background Art
[0002] Currently, most new energy vehicles and energy storage systems use prismatic aluminum-cased batteries. When assembled into groups, these batteries are typically electrically connected via aluminum bars, which are typically laser-welded to the battery terminals. To ensure laser welding quality, the exposed exterior of both battery terminals is typically made of aluminum, while the internal negative electrode is typically copper. Consequently, the negative terminal is a copper-aluminum composite terminal, typically friction-welded to achieve the copper-to-aluminum material conversion while maintaining electrical connectivity.
[0003] To ensure the strength of the friction-welded copper-aluminum interface, the current mainstream practice is to lathe the copper surface to create circular ripples or spiral patterns to increase the contact area between the copper and aluminum. However, in practice, products from various terminal manufacturers have experienced failures due to friction-welded interface fracture. This fracture can cause the entire circuit to open. If this occurs while a vehicle is in motion, it can suddenly lose power and stall, posing a significant safety risk. Terminal manufacturers lack effective detection methods for friction-welded interface fracture, making it impossible to fully screen for potential defective products. Utility Model Content
[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a new composite electrode, battery, and electrical equipment to address the current technical problem of friction-welded lithium battery negative electrode electrodes, where the copper-aluminum interface is susceptible to abnormal fracture, disconnecting the entire vehicle circuit and causing instantaneous power loss, which can pose a safety hazard.
[0005] In a first aspect, the present application provides a composite pole, comprising:
[0006] The first pole 100 has a first surface 110 , and the first pole 100 has a plastic deformation property;
[0007] The second pole 200 has a second surface 210 that is recessed downward to form a cavity 220. The second surface 210 has a first end 211 adjacent to an opening 221 of the cavity 220 and a second end 212 adjacent to an outer wall of the second pole 200. The first end 211 is vertically lower than the second end 212.
[0008] When the first pole 100 and the second pole 200 are welded, the first surface 110 and the second surface 210 are in contact with each other, and at least a portion of the first pole 100 is squeezed toward and fills the cavity 220 to form a mortise and tenon structure.
[0009] According to the embodiment of the present application, a mortise and tenon structure is formed at the joint surface between the first pole 100 and the second pole 200. Therefore, even if the joint surface between the first pole 100 and the second pole 200 is disconnected, the mortise and tenon structure can still maintain the connection between the first pole 100 and the second pole 200. On the one hand, it can avoid the disconnection of the entire vehicle circuit due to abnormal fracture of the joint surface between the first pole 100 and the second pole 200, resulting in instantaneous power loss and thus causing a safety hazard. On the other hand, it can improve the mechanical connection strength between the first pole 100 and the second pole 200.
[0010] Furthermore, in the embodiment of the present application, the vertical height of the first end 211 is set to be lower than the second end 212, so that the second surface 210 is inclined toward the cavity 220, thereby facilitating the portion of the first pole 100 having the characteristic of plastic deformation to be squeezed toward and fill the cavity 220 during the welding process between the first pole 100 and the second pole 200.
[0011] In one technical solution of the composite pole, along a depth direction perpendicular to the cavity 220 , the cross-sectional area of the opening 221 of the cavity 220 is smaller than the cross-sectional area of the bottom surface 222 of the cavity 220 .
[0012] Through the embodiment of the present application, the portion of the first pole 100 filled into the cavity 220 forms a mortise and tenon structure with the cavity 220, which plays a role in riveting and fixing the first pole 100 and the second pole 200. This not only improves the mechanical connection strength between the first pole 100 and the second pole 200, but also ensures that even if the joint surface between the first pole 100 and the second pole 200 is disconnected, the mortise and tenon structure can still maintain the connection between the first pole 100 and the second pole 200.
[0013] In one technical solution of the composite pole described above, the cross-sectional area of the cavity 220 gradually increases along a depth direction perpendicular to the cavity 220 .
[0014] In one technical solution of the composite pole described above, in a transverse cross section of the composite pole, the cross-sectional area of the opening 221 of the cavity 220 is one quarter of the cross-sectional area of the second surface 210 .
[0015] In one technical solution of the composite pole, in a vertical cross section of the composite pole, at least a portion of the inner sidewall 223 of the cavity 220 forms a first acute angle with the outer sidewall 230 of the second pole 200 , and the second surface 210 forms a second acute angle with the outer sidewall 230 of the second pole 200 .
[0016] In a technical solution of the above-mentioned composite pole, the angle of the first acute angle is 20-45°, and the angle of the second acute angle is 75-80°.
[0017] In one technical solution of the composite pole, a vent hole 240 is provided at the bottom of the cavity 220 , and the vent hole 240 connects the cavity 220 with the outside of the second pole 200 .
[0018] Through the embodiments of the present application, during the welding process of the first pole 100 and the second pole 200, the air in the cavity 220 can be discharged outside the cavity 220 through the exhaust hole 240, so that the first pole 100 squeezed into the cavity 220 can fill the cavity 220, thereby improving the connection effect between the first pole 100 and the second pole 200.
[0019] In a second aspect, the present application provides a battery comprising at least the composite electrode according to any one of the first aspects, the battery further comprising:
[0020] Battery cover;
[0021] a fixing member 300 connected to an end of the second pole 200 away from the first pole 100;
[0022] an insulating member 400, which is sleeved on the outer side of the first electrode 100 and part of the second electrode 200, so as to keep the composite electrode insulated from the battery top cover when the composite electrode is installed on the battery top cover;
[0023] The sealing member 500 is provided at an end of the second pole 200 away from the first pole 100 and is located between the battery top cover and the fixing member 300 .
[0024] In one technical solution of the above-mentioned battery, the fixing member 300 is provided with a mounting hole 310, the mounting hole 310 is provided with an internal thread 320, and the outer wall of the end of the second pole 200 away from the first pole 100 is provided with an external thread 250;
[0025] After the fixing member 300 is connected to the second pole 200 through the internal thread 320 and the external thread 250, the fixed connection between the two is achieved by welding. When the composite pole is installed on the battery top cover, the first pole 100 is located on the side of the battery top cover exposed to the external environment, and the fixing member 300 is located on the side of the battery top cover close to the internal space of the battery.
[0026] In a third aspect, the present application provides an electrical device, characterized in that it comprises at least the composite pole as described in any one of the first aspects or the battery as described in any one of the second aspects.
[0027] The above one or more technical solutions of this application have at least one or more of the following beneficial effects:
[0028] In the technical solution of the present application, a mortise and tenon structure is formed between the joint surfaces (including the first surface 110 and the second surface 210) of the first electrode 100 and the second electrode 200. This structure allows the connection between the first electrode 100 and the second electrode 200 to be maintained even if the joint surfaces are broken. This prevents the vehicle circuit from being disconnected due to abnormal breakage of the joint surfaces, resulting in a momentary power loss and a potential safety hazard. Furthermore, the mechanical connection strength between the first electrode 100 and the second electrode 200 is improved. Furthermore, by arranging the first end 211 of the second surface 210, which is adjacent to the opening 221 of the cavity 220, to be lower in vertical height than the second end 212, which is adjacent to the outer wall of the second electrode 200, during the welding process between the first electrode 100 and the second electrode 200, at least a portion of the first electrode 100, which has the characteristic of plastic deformation, is squeezed toward and fills the cavity 220, thereby forming the mortise and tenon structure.
[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] The disclosure of this application will be more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the figures represent similar components, where:
[0031] Figure 1 is a schematic diagram of the three-dimensional structure of a composite pole provided in some embodiments of the present application;
[0032] Figure 2 is an exploded view of a composite pole provided in some embodiments of the present application;
[0033] Figure 3 is a cross-sectional view of a composite pole provided in some embodiments of the present application;
[0034] Figure 4 is a schematic structural diagram of a second pole provided in some embodiments of the present application;
[0035] Figure 5 is a schematic diagram of the three-dimensional structure of a battery provided in some embodiments of the present application;
[0036] Figure 6 is an exploded view of a battery provided in some embodiments of the present application;
[0037] Figure 7 is a cross-sectional view of a battery provided in some embodiments of the present application. Description of the drawings:
[0039] 100, first pole; 110, first surface; 120, first part; 130, second part; 200, second pole; 210, second surface; 211, first end; 212, second end; 220, cavity; 221, opening; 222, bottom surface; 223, inner wall; 230, outer wall; 240, exhaust hole; 250, external thread; 300, fixing member; 310, mounting hole; 320, internal thread; 400, insulating member; 410, first annular structure; 420, second annular structure; 430, transition zone; 500, sealing member. DETAILED DESCRIPTION
[0040] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application.
[0041] As described in the background art, the copper-aluminum joint surface of the copper-aluminum composite pole using the friction welding process in the prior art may break. If this problem occurs while the vehicle is driving, the vehicle will suddenly lose power and stall, posing a huge safety risk.
[0042] Based on the above problems, the embodiments of the present application creatively propose a new composite electrode, battery and electrical equipment. The composite electrode can solve the technical problems that the copper-aluminum interface of the negative electrode of the lithium battery currently using friction welding is easily broken due to abnormal fracture, causing the entire vehicle circuit to be disconnected, resulting in instantaneous power failure and causing safety hazards.
[0043] Example 1
[0044] Figure 1 is a schematic diagram of the three-dimensional structure of a composite pole provided in some embodiments of the present application. Figure 2 is an exploded view of a composite pole provided in some embodiments of the present application. Figure 3is a cross-sectional view of a composite pole provided in some embodiments of the present application, referring to Figures 1 to 3 As shown, the composite pole provided in the embodiment of the present application generally includes a first pole 100 and a second pole 200. The first pole 100 has a first surface 110, and the second pole has a second surface 210. The first surface 110 and the second surface 210 are respectively formed as mounting surfaces of the first pole 100 and the second pole 200. That is, the first surface 110 and the second surface 210 are arranged opposite to each other, and when the first pole 100 and the second pole 200 are welded, the first surface 110 and the second surface 210 are in contact with each other.
[0045] It is understood that both the first pole 100 and the second pole 200 are made of conductive materials. In some specific embodiments, the first pole 100 is made of a material having plastic deformation properties. As an example and not limitation, the material of the first pole 100 includes, but is not limited to, aluminum, an aluminum alloy, etc. The second pole 200 is made of a material having a higher hardness than the first pole 100. As an example and not limitation, the material of the first pole 100 includes, but is not limited to, copper, a copper alloy, etc.
[0046] It should be noted that in the embodiments of the present application, the shapes of the first and second poles 100, 200 are not specifically limited. Without violating the inventive concept of the present application, they can be set according to actual product requirements. For example, as an illustrative and non-limiting explanation, the shapes of the first and second poles 100, 200 in the embodiments of the present application can be cylindrical or polygonal. The following description of the present application scheme is based on the example of the first and second poles 100, 200 being cylindrical structures.
[0047] Reference Figure 4As shown, the second surface 210 is recessed downward to form a cavity 220. The cavity 220 has an opening 221 facing the first pole 100. The second surface 210 has a first end 211 and a second end 212. The first end 211 is located near the opening 221 of the cavity 220, and the second end 212 is located near the outer wall 230 of the second pole 200. The first end 211 is vertically lower than the second end 212, so that the second surface 210 is inclined toward the cavity 220. With this arrangement, when the first pole 100 and the second pole 200 are welded, at least a portion of the first pole 100 is squeezed into the cavity 220 and fills it completely, thereby forming a mortise and tenon structure. Even if the joint surface between the first pole 100 and the second pole 200 is disconnected, the connection between the first pole 100 and the second pole 200 can still be maintained by the mortise and tenon structure. This can, on the one hand, prevent the entire vehicle circuit from being disconnected due to abnormal fracture of the joint surface between the first pole 100 and the second pole 200, resulting in instantaneous power loss and thus a safety hazard. On the other hand, it can improve the mechanical connection strength between the first pole 100 and the second pole 200.
[0048] It can be understood that the vertical height of the first end 211 of the second surface 210 is lower than the vertical height of the second end 212. Therefore, the second surface 210 and the outer wall 230 of the second pole 200 are not arranged perpendicular to each other (90°) as usual, but the second surface 210 is inclined toward the cavity 220, so that the second surface 210 and the outer wall 230 of the second pole 200 are arranged at a second acute angle.
[0049] It should be noted that in the embodiments of the present application, the specific size of the second acute angle is not limited and can be set according to actual product requirements without violating the inventive concept of the present application. Preferably, the angle of the second acute angle is any value between 75° and 80°. For example, the angle of the first acute angle can be 75°, 76°, 77°, 78°, 79°, 80°, etc., which are not listed here one by one.
[0050] It should be noted that in the embodiment of the present application, the shape and size of the cavity 220 are not specifically limited. Without violating the inventive concept of the present application, they can be set according to actual product requirements. It is understandable that in order to reduce the complexity of the processing technology, the shape and size of the cavity 220 can be set or adjusted according to the shape and size of the second pole 200. For example, as an exemplary and non-limiting explanation, when the second pole 200 is an overall cylindrical structure, the cross-sectional area of the cavity 220 in the embodiment of the present application along the depth direction perpendicular to the cavity 220 can be circular or polygonal.
[0051] In some specific embodiments, the cross-sectional area of the opening 221 of the cavity 220 can be set to be smaller than the cross-sectional area of the bottom surface 222 of the cavity 220 along the depth direction perpendicular to the cavity 220. It is understandable that by configuring the cavity 220 to be smaller at the opening 221 and larger at the bottom surface 222, the portion of the first pole 100 that is squeezed and filled into the cavity 220 can form a "smaller at the top and larger at the bottom" mortise and tenon structure with the cavity 220, thereby achieving a riveting and mutual fixation effect. This not only improves the mechanical connection strength between the first pole 100 and the second pole 200, but also ensures that even if the joint surface between the first pole 100 and the second pole 200 is disconnected, the mortise and tenon structure can still maintain the connection between the first pole 100 and the second pole 200.
[0052] In some specific embodiments, the cross-sectional area of the cavity 220 gradually increases along the depth direction perpendicular to the cavity 220. It is understood that by arranging the cavity 220 such that the cross-sectional area gradually increases along the depth direction perpendicular to the cavity 220, so that the cross-section along the depth direction perpendicular to the cavity 220 is tapered, the complexity of the processing technology can be reduced, thereby reducing production costs.
[0053] It is understood that, in a cross-section along the transverse direction of the composite pole, the cross-sectional area of the opening 221 of the cavity 220 is smaller than the cross-sectional area of the second surface 210. Taking the example of a cylindrical second pole 200 and a circular opening 221 of the cavity 220 as an example, as an illustrative and non-limiting explanation, in the embodiment of the present application, the diameter of the opening 221 can be set to half the diameter of the second surface 210, that is, in a cross-section along the transverse direction of the composite pole, the cross-sectional area of the opening 221 of the cavity 220 is one-quarter the cross-sectional area of the second surface 210.
[0054] It can be understood that in order to form the cavity 220 into a shape that is smaller at the opening 221 and larger at the bottom 222, so as to facilitate the portion of the first pole 100 that is squeezed and filled into the cavity 220 to form a "small on top and large on the bottom" mortise and tenon structure with the cavity 220, which plays the role of riveting and fixing each other, in the embodiment of the present application, it is provided that on the vertical cross section of the composite pole, at least part of the inner side wall 223 of the cavity 220 and the outer side wall 230 of the second pole 200 are in the first direction. An acute angle arrangement is provided, that is, at least a portion of the inner sidewall 223 of the cavity 220 and the outer sidewall 230 of the second pole 200 are not arranged relatively parallel to each other, but at least a portion of the inner sidewall 223 of the cavity 220 is closer to the outer sidewall 230 of the second pole 200 at one end close to the bottom surface 222 of the cavity 220 than at the end close to the opening 221, so that at least a portion of the inner sidewall 223 of the cavity 220 and the outer sidewall 230 of the second pole 200 are arranged at a first acute angle.
[0055] It should be noted that in the embodiments of the present application, the specific size of the first acute angle is not limited and can be set according to actual product requirements without violating the inventive concept of the present application. Preferably, the angle of the first acute angle is any value between 20 and 45 degrees, such as 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, etc., which are not listed here one by one.
[0056] It is understood that in the present embodiment, the position of the cavity 220 relative to the second pole 200 is not specifically limited, as long as it satisfies the requirement that, when the first pole 100 and the second pole 200 are welded, at least a portion of the first pole 100 can be squeezed toward and fill the cavity 220 to form a mortise and tenon structure. As an example and not a limitation, in the present embodiment, the cavity 220 is located at the center of the second pole 200.
[0057] Further references Figure 3 and Figure 4 As shown, in the embodiment of the present application, a vent hole 240 is further provided at the bottom of the cavity 220, which connects the cavity 220 with the outside of the second pole 200. With this arrangement, during the welding process of the first pole 100 and the second pole 200, when the first pole 100 is at least partially squeezed toward and fills the cavity 220 to form the mortise and tenon structure, the air in the cavity 220 can be discharged from the cavity 220 through the vent hole 240, so that the first pole 100 squeezed toward the cavity 220 can fully fill the cavity 220, avoiding the presence of gaps and improving the connection effect between the first pole 100 and the second pole 200.
[0058] It should be noted that in the embodiment of the present application, the shape and size of the exhaust hole 240 are not specifically limited. Without violating the inventive concept of the present application, they can be set according to actual product requirements, and will not be described in detail here.
[0059] It is understandable that the various parameters of the composite pole provided in the embodiment of the present application can be set according to actual product requirements and are not specifically limited here. As an exemplary and non-restrictive explanation, in some specific embodiments, the composite pole is applied to square shell batteries, and the diameter of the second pole 200 of the negative composite pole and the end of the first pole 100 close to the second pole 200 are 24 mm, and the overall height is 9 mm, of which the height of the first pole 100 is 3 mm, the height of the second pole 200 is 6 mm, the diameter of the opening 221 of the cavity 220 of the second pole 200 is 10 mm, the angle of the first acute angle is 40°, and the depth of the cavity is 3 mm. The angle of the second acute angle is 75°, and the diameter of the middle exhaust hole 240 is 1.5 mm.
[0060] Example 2
[0061] Corresponding to the above embodiment 1, the present application further provides a battery, which includes the composite pole as described in any one of the embodiments 1, wherein in this embodiment, the same or similar contents as those in the above embodiment 1 can be referred to the above introduction and will not be described in detail later. Figures 5 and 6 As shown, the battery further includes a battery top cover (not shown), a fixing member 300, an insulating member 400, and a sealing member 500. The fixing member 300 is connected to the end of the second electrode 200 away from the first electrode 100; the insulating member 400 is sleeved on the outside of the first electrode 100 and a portion of the second electrode 200 to insulate the composite electrode from the battery top cover (not shown) when the composite electrode is installed on the battery top cover (not shown); and the sealing member 500 is disposed at the end of the second electrode 200 away from the first electrode 100 and located between the battery top cover (not shown) and the fixing member 300. When the composite electrode is installed on the battery top cover (not shown), the first electrode 100 is located on the side of the battery top cover (not shown) exposed to the external environment, and the fixing member 300 is located on the side of the battery top cover (not shown) close to the internal space of the battery.
[0062] It can be understood that a through hole (not shown) is provided on the battery top cover (not shown in the figure). When the composite pole is assembled on the battery top cover (not shown in the figure), the end of the first pole 100 away from the second pole 200 is exposed to the external environment through the through hole (not shown in the figure).
[0063] Further references Figure 6 As shown, in some specific embodiments, along the longitudinal direction of the composite pole, the cross-sectional area of the end of the first pole 100 away from the second pole 200 is greater than the cross-sectional area of the through hole (not shown). Specifically, the first pole 100 is composed of a first portion 120 and a second portion 130. The first portion 120 is located away from the second pole 200, while the second portion 130 is located closer to the second pole 200. The first surface 110 is provided on the end surface of the second portion 130 away from the first portion 120. Along the transverse direction of the composite pole, the cross-sectional area of the first portion 120 is greater than the cross-sectional area of the second portion 130. When the composite electrode is assembled on the battery top cover (not shown in the figure), the first part 120 is located on the side of the battery top cover (not shown in the figure) exposed to the external environment, the second part 130 and the second electrode 200 are arranged on the side of the battery top cover (not shown in the figure) close to the internal space of the battery through the through hole (not shown in the figure), and the side of the first part 120 close to the second part 130 is in contact with the battery top cover (not shown in the figure), and the side of the fixing member 300 close to the battery top cover (not shown in the figure) is in contact with the battery top cover (not shown), thereby fixing the entire composite electrode on the battery top cover.
[0064] It should be noted that in the embodiments of this application, the shape and size of the fixing member 300 are not specifically limited. Without violating the inventive concept of this application, it only needs to be compatible with the composite terminal and facilitate the fixing of the composite terminal to the battery top cover. As an example and not a limitation, the fixing member 300 can be an overall cylindrical structure or a rectangular parallelepiped structure, etc., which will not be enumerated here.
[0065] Further references Figure 6 As shown, a mounting hole 310 is formed on the fixing member 300 , and an end of the second pole 200 away from the first pole 100 is disposed in the mounting hole 310 , thereby achieving connection between the composite pole and the fixing member 300 .
[0066] As a preferred embodiment, in the embodiment of the present application, an internal thread 320 is provided in the mounting hole 310, and an external thread 250 is provided on the outer wall of the end of the second pole 200 away from the first pole 100. After the fixing member 300 and the second pole 200 are initially connected by threaded fastening via the internal thread 320 and the external thread 250, the two are further connected by welding on the lower surface of the fixing member 300 (i.e., the surface opposite to the side where the battery top cover is provided). With this arrangement, during the welding process between the composite pole and the fixing member 300, even if the weld cracks, the connection between the composite pole and the fixing member 300 can still be maintained by the internal thread 320 and the external thread 250, thereby solving the problem of direct separation of the fixing block and the composite pole when laser welding cracks in the current pole without thread design.
[0067] Further references Figure 6 As shown, the insulating member 400 is an annular structure as a whole. In a specific implementation, the insulating member 400 includes a first annular structure 410, a second annular structure 420, and a transition zone 430. The inner diameter of the first annular structure 410 is larger than the inner diameter of the second annular structure 420. The transition zone 430 is located between the first annular structure 410 and the second annular structure 420. The transition zone 430 is formed at one end of the second annular structure 420 near the first annular structure 410 and extends radially from the second annular structure 420 toward the first annular structure 410. The first annular structure 410 is sleeved on the outside of the first portion 120, and the second annular structure 420 is sleeved on the outside of the second portion 130 and part of the second pole 200. The transition zone 430 is in contact with the side of the first portion 120 near the second portion 130, thereby maintaining insulation between the composite pole and the battery top cover.
[0068] It should be noted that in the embodiment of the present application, the specific material of the insulating member 400 is not limited. Without violating the inventive concept of the present application, the material of the insulating member 400 includes but is not limited to plastic.
[0069] It is understood that the seal 500 in the embodiment of the present application has a certain compression rate, thereby maintaining the sealing between the composite terminal and the battery top cover. It should be noted that the specific material of the seal 500 is not limited in the embodiment of the present application. Without violating the inventive concept of the present application, the material of the seal 500 includes but is not limited to silicone.
[0070] It can be understood that in some specific embodiments, the battery further includes a battery cell (not shown), which is located on the side of the battery top cover (not shown) where a fixing member 300 is provided, and the negative electrode of the battery cell is electrically connected to the second pole 200 of the above-mentioned composite pole.
[0071] Example 3
[0072] Corresponding to the above-mentioned embodiment 1 or 2, the present application further provides an electrical device, which includes the composite pole described in any one of the embodiments 1 or the battery described in any one of the embodiments 2. In this embodiment, the same or similar contents as those in the above-mentioned embodiment 1 or 2 can be referred to the above description and will not be repeated in the following.
[0073] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.
[0074] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.
[0076] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0077] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A composite pole, characterized in that: The composite pole comprises: A first pole (100) having a first surface (110), wherein the first pole (100) has a plastic deformation characteristic; A second pole (200) has a second surface (210), the second surface (210) is recessed downward to form a cavity (220), the second surface (210) has a first end (211) close to an opening (221) of the cavity (220) and a second end (212) close to an outer sidewall (230) of the second pole (200), and the first end (211) is lower in vertical height than the second end (212); When the first pole (100) and the second pole (200) are welded, the first surface (110) and the second surface (210) are in contact with each other, and at least a portion of the first pole (100) is squeezed toward and fills the cavity (220), forming a mortise and tenon structure.
2. The composite pole according to claim 1, characterized in that: Along a depth direction perpendicular to the cavity (220), the cross-sectional area of the opening (221) of the cavity (220) is smaller than the cross-sectional area of the bottom surface (222) of the cavity (220).
3. The composite pole according to claim 2, characterized in that: Along a depth direction perpendicular to the cavity (220), the cross-sectional area of the cavity (220) gradually increases.
4. The composite pole according to claim 1, characterized in that: In a transverse cross section of the composite pole, the cross-sectional area of the opening (221) of the cavity (220) is one quarter of the cross-sectional area of the second surface (210).
5. The composite pole according to claim 1, characterized in that: In a vertical cross section along the composite pole, at least a portion of the inner sidewall (223) of the cavity (220) and the outer sidewall (230) of the second pole (200) are arranged at a first acute angle, and the second surface (210) and the outer sidewall (230) of the second pole (200) are arranged at a second acute angle.
6. The composite pole according to claim 5, characterized in that: The first acute angle is in the range of 20 to 45 degrees, and the second acute angle is in the range of 75 to 80 degrees.
7. The composite pole according to claim 1, characterized in that: An exhaust hole (240) is provided at the bottom of the cavity (220), and the exhaust hole (240) connects the cavity (220) with the outside of the second pole (200).
8. A battery, characterized in that: The battery comprises at least the composite electrode according to any one of claims 1 to 7, and further comprises: Battery cover; a fixing member (300), the fixing member (300) being connected to an end of the second pole (200) away from the first pole (100); an insulating member (400) sleeved on the outside of the first pole (100) and part of the second pole (200) to keep the composite pole insulated from the battery top cover when the composite pole is mounted on the battery top cover; A sealing member (500) is provided at an end of the second pole (200) away from the first pole (100) and is located between the battery top cover and the fixing member (300).
9. The battery according to claim 8, characterized in that The fixing member (300) is provided with a mounting hole (310), an internal thread (320) is provided in the mounting hole (310), and an external thread (250) is provided on the outer side wall of the end of the second pole (200) away from the first pole (100); After the fixing member (300) is connected to the second pole (200) through the internal thread (320) and the external thread (250), the two are fixedly connected by welding. When the composite pole is installed on the battery top cover, the first pole (100) is located on the side of the battery top cover exposed to the external environment, and the fixing member (300) is located on the side of the battery top cover close to the internal space of the battery.
10. An electrical device, characterized in that: The method comprises at least the composite electrode according to any one of claims 1 to 7 or the battery according to any one of claims 8 or 9.