A terminal assembly, a cover assembly, and a battery

Abstract

This utility model proposes an electrode post assembly, a cover plate assembly, and a battery. The electrode post assembly includes a lower plastic and an electrode post. The lower plastic includes a first lower plastic and a second lower plastic, which are arranged along a first direction and fixed by a first connecting part and a second connecting part. After the first lower plastic and the second lower plastic are connected, they form an electrode post hole by a first engaging part and a second engaging part to achieve radial positioning of the electrode post. The electrode post includes an electrode post body, an upper plastic, a sealing element, and a welding ring. An electrode post base plate is formed on the electrode post body. The lower plastic is installed between the electrode post base plate and the welding ring for fixation. The mating structure between the lower plastic and the electrode post reduces the number of plastic parts and welding processes, thus optimizing the assembly process.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to an electrode assembly, a cover plate assembly, and a battery. Background Technology

[0002] As a core component of power batteries, the structural design and manufacturing reliability of the cover plate assembly have a significant impact on the battery's energy density and safety. With the continuous improvement of power battery energy density requirements, independent small-terminal cover plate assemblies have become a key development direction in the industry due to their advantages such as low tab height and high space utilization. The plastic parts of the cover plate assembly generally include the lower plastic and the lower plastic of the terminal post, which need to be assembled separately. Moreover, the lower plastic needs to be fixed to the aluminum sheet through ultrasonic welding during assembly, which not only involves a large number of parts and complex assembly processes, but also results in high manufacturing costs. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a terminal post assembly, a cover plate assembly, and a battery to solve the problems of numerous plastic parts, complex assembly process, and high process cost in the cover plate assembly.

[0004] To achieve the above and other related objectives, this utility model provides an electrode assembly, including a lower plastic and an electrode, wherein the lower plastic includes a first lower plastic and a second lower plastic, and the first lower plastic and the second lower plastic are arranged along a first direction;

[0005] At least one of the first lower plastic and the second lower plastic is provided with a first connecting part, and the other is provided with a corresponding second connecting part. The first connecting part and the second connecting part are connected to fix the relative position of the first lower plastic and the second lower plastic.

[0006] One of the first lower plastic and the second lower plastic is provided with at least one first engaging portion, and the other is provided with a second engaging portion that cooperates with the at least one first engaging portion. The at least one first engaging portion and the corresponding second engaging portion cooperate to form at least one pole hole to fix the pole in the radial direction of the pole.

[0007] In an optional embodiment of this utility model, the electrode post includes an electrode post body, an upper plastic and a welding ring. The upper plastic is arranged around the outer periphery of the electrode post body, and the welding ring is arranged around the outer periphery of the upper plastic. The welding ring and the electrode post body clamp the lower plastic in a second direction.

[0008] In an optional embodiment of this utility model, a base plate is formed at the bottom of the pole body, the lower plastic is disposed on the base plate, the welding ring is pressed on the lower plastic, and the welding ring and the base plate clamp the lower plastic in the second direction.

[0009] In an optional embodiment of this utility model, the side of the welding ring opposite to the lower plastic extends along the second direction to form a first protrusion, and the side of the lower plastic opposite to the welding ring is recessed along the second direction to form a first groove. The first protrusion and the first groove abut against each other along the second direction so that the welding ring and the pole plate clamp the lower plastic in the second direction.

[0010] In an optional embodiment of this utility model, a first positioning structure is further provided on the side of the lower plastic that is in contact with the pole base plate, and the first positioning structure is arranged at both ends of the pole base plate along the second direction.

[0011] The first positioning structure includes a first positioning part and a first mating groove, wherein the first positioning part is embedded in the first mating groove;

[0012] The first positioning part is disposed on the lower plastic, and the first mating groove is disposed on the pole post base plate, or the first positioning part is disposed on the pole post base plate, and the first mating groove is disposed on the lower plastic.

[0013] In an optional embodiment of the present invention, the first connecting portion is disposed on the side of the first lower plastic near the second lower plastic, and the second connecting portion is disposed on the side of the second lower plastic near the first lower plastic. The first connecting portion and the second connecting portion are configured to engage with each other in the first direction to connect the first lower plastic and the second lower plastic.

[0014] In an optional embodiment of this utility model, the first connecting part includes a hook, and the second connecting part includes a slot that matches the hook. The hook and the slot engage with each other in the first direction to connect the first lower plastic and the second lower plastic. The end of the hook and / or the slot is provided with a guide slope to guide the hook to slide into the slot along the first direction.

[0015] In an optional embodiment of this utility model, the side of the lower plastic that is opposite to the pole base plate extends along the second direction to form a second protrusion, and the pole base plate is disposed in the groove space surrounded by the second protrusion.

[0016] In an optional embodiment of this utility model, the pole post further includes a sealing element, wherein the upper plastic, the pole post base plate, the welding ring, and the lower plastic form a cavity, and the sealing element fills the cavity to achieve a seal;

[0017] Under normal conditions, the sealing element includes a first part and a second part, wherein the thickness of the first part in the height direction of the pole base plate is less than the height of the cavity, and the thickness of the second part in the height direction of the pole base plate is greater than the height of the cavity.

[0018] The second part forms a sealing ring flow cavity between the upper plastic and the lower plastic, and the second part is configured to fill the sealing ring flow cavity to achieve a seal when the seal is compressed.

[0019] In an optional embodiment of this utility model, the side of the sealing element that contacts the welding ring is the first end face.

[0020] The second part facing the lower plastic is set as a first inclined surface and the angle between the first inclined surface and the first end face is an obtuse angle, and / or the second part facing the upper plastic is set as a second inclined surface and the angle between the second inclined surface and the first end face is an obtuse angle.

[0021] The present invention also proposes a cover plate assembly, including a pole post assembly as described in any of the above embodiments, and a cover plate body. A second positioning structure is provided on the side of the lower plastic and the cover plate body that are in contact with each other. The second positioning structure includes a second positioning part and a second mating groove, and the second positioning part is embedded in the second mating groove.

[0022] The second positioning part is disposed on the lower plastic, and the second mating groove is disposed on the cover plate body, or the second positioning part is disposed on the cover plate body and the second mating groove is disposed on the lower plastic.

[0023] In an optional embodiment of this utility model, a third protrusion is formed on the outer peripheral surface of the welding ring near the lower plastic, and a third groove is formed on the side of the cover plate body near the lower plastic, and the third protrusion and the third groove cooperate to connect the cover plate body to the welding ring.

[0024] This utility model also proposes a battery, including a cover assembly as described in any of the above embodiments.

[0025] The technical advantages of this utility model are as follows: the lower plastic is composed of a first lower plastic and a second lower plastic arranged separately along a first direction, and their relative positions are fixed by the snap-fit ​​connection between the first connecting part and the second connecting part, which simplifies the assembly process. Moreover, the assembly of the lower plastic does not require welding, eliminating the risks of plastic deformation or sealing failure caused by welding, and reducing process costs. When assembling the cover plate body, the lower plastic and the cover plate body are fitted and positioned by the second positioning structure, ensuring that the assembly position of the cover plate body and the lower plastic is accurate and avoiding welding misalignment.

[0026] The first and second engaging parts cooperate to form a terminal hole to constrain the radial movement of the terminal, prevent the terminal from vibrating and shifting, and improve structural stability. The terminal can be welded to the bare cell tab first, and then plastic is assembled from both sides to form a terminal assembly. The entire terminal assembly is then assembled with the cover plate body. Compared with the method of first forming the terminal and the cover plate body into a whole and then assembling it with the bare cell tab, this method avoids excessive stretching of the tab, thereby shortening the length of the tab, improving the internal space utilization of the cell, and simplifying the assembly process of the terminal assembly.

[0027] By coordinating the split plastic structure, snap-fit ​​fixing structure, independent terminal structure, and various positioning structures, the battery sealing and structural reliability are improved, the assembly process is simplified, space utilization is maximized, and the battery energy density is increased. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the pole assembly in an optional embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the pole assembly from another perspective in an optional embodiment of the present invention;

[0031] Figure 3 This is a cross-sectional view of the pole assembly in an optional embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of the first lower plastic and the second lower plastic in an optional embodiment of the present invention;

[0033] Figure 5 This is a partial structural diagram of the first lower plastic and the second lower plastic in an optional embodiment of the present invention;

[0034] Figure 6 This is a cross-sectional view of the first connecting portion and the second connecting portion in an optional embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the connection structure of the sealing element in an optional embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of the second positioning structure in an optional embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the pole body in an optional embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of the overall structure of the cover plate assembly in an optional embodiment of the present invention;

[0039] Figure 11 This is a partial structural cross-sectional view of the cover plate assembly in an optional embodiment of the present invention;

[0040] Figure 12 This is a partial structural cross-sectional view of the cover plate assembly in an optional embodiment of the present invention;

[0041] Figure 13 This is a schematic diagram of the connection structure between the lower plastic and the cover plate body in an optional embodiment of the present invention;

[0042] Figure 14 This is a cross-sectional view of the connection structure between the lower plastic and the cover plate body in an optional embodiment of this utility model;

[0043] Figure 15 This is a cross-sectional view of the connection structure between the lower plastic and the cover plate body in another optional embodiment of this utility model;

[0044] Figure 16 This is a partial structural cross-sectional view of the connection between the cover plate assembly and the battery cell in an optional embodiment of the present invention;

[0045] Figure 17 This is a schematic diagram of the connection between the cover plate assembly and the battery cell in an optional embodiment of the present invention.

[0046] Label Explanation:

[0047] 100. Lower plastic part; 110. First lower plastic part; 120. Second lower plastic part; 130. First connecting part; 140. Second connecting part; 150. First engaging part; 160. Second engaging part; 170. First groove; 180. Second protrusion;

[0048] 131. Hook; 141. Slot;

[0049] 200. Terminal post; 210. Terminal post body; 220. Upper plastic coating; 230. Welding ring; 240. Seal;

[0050] 211. Base plate of pole post; 231. First protrusion; 232. Third protrusion; 241. First part; 242. Second part; 243. First end face; 2421. First inclined surface; 2422. Second inclined surface;

[0051] 300. First positioning structure; 310. First positioning part; 320. First mating groove;

[0052] 400. Cover plate body; 410. Third groove;

[0053] 500, Second positioning structure; 510, Second positioning part; 520, Second mating groove. Detailed Implementation

[0054] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0055] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0056] In current independent terminal cover assemblies, multiple plastic parts, such as the lower plastic part of the terminal and the lower plastic part of the terminal, are used for assembly. The number of lower plastic parts and the lower plastic part of the terminal are large, and the lower plastic part needs to be ultrasonically welded to the aluminum sheet for fixation. This not only makes the assembly process complicated and costly, but also makes it easy for the plastic parts to deform or the seal to fail due to the thermal stress generated during the welding process. The split structure also affects the reliability of the seal between the terminal and the shell. Therefore, this utility model proposes a cover assembly and battery to solve the above problems.

[0057] Please see Figures 1 to 17This utility model proposes an electrode assembly, including a lower plastic 100 and an electrode 200. The lower plastic 100 includes a first lower plastic 110 and a second lower plastic 120 that are separately arranged. The two are arranged along a first direction and are fixed in position by the cooperation of a first connecting part 130 and a second connecting part 140. The first direction is, for example, the width direction of the lower plastic 100. At the same time, after the first lower plastic 110 and the second lower plastic 120 are connected, an electrode hole is formed by the cooperation of a first engaging part 150 and a second engaging part 160 to constrain the radial movement of the electrode 200. With this split-type lower plastic structure design, the lower plastic 100 and the pole post 200 can be assembled by installing the first lower plastic 110 and the second lower plastic 120 from both sides of the pole post 200, which is simple, quick and simplifies the assembly process. The snap-fit ​​part ensures the accurate positioning of the pole post 200 and the lower plastic 100, which can effectively prevent the pole post 200 from shifting. The connecting part can achieve a stable connection of the lower plastic 100 as a whole. Moreover, this installation method can achieve the pressing and fixing of the pole post 200 to the lower plastic 100 without welding the lower plastic 100 and the pole post 200. This reduces the number of plastic parts and welding processes, optimizes the assembly process and reduces process costs.

[0058] Please see Figures 1 to 6 as well as Figures 11 to 16 In an optional embodiment of this utility model, at least one of the first lower plastic 110 and the second lower plastic 120 is provided with a first connecting portion 130, and the other is provided with a corresponding second connecting portion 140. The first connecting portion 130 and the second connecting portion 140 are connected to fix the relative positions of the first lower plastic 110 and the second lower plastic 120, thereby connecting the lower plastic 100 into a whole and ensuring the stability of the structure. After installation, the lower plastic 100 can be fixed by the pole post 200 without additional welding. One of the first lower plastic 110 and the second lower plastic 120 is also provided with at least one first engaging portion 150, and the other is provided with a second engaging portion 160 that engages with at least one first engaging portion 150. The at least one first engaging portion 150 and the corresponding second engaging portion 160 engage to form at least one pole post hole to fix the pole post 200 in the radial direction, and to prevent the pole post 200 from shifting by accurate positioning. The lower plastic 100 is composed of a first lower plastic 110 and a second lower plastic 120 arranged separately along the first direction. The relative positions are fixed by the engagement of the first connecting part 130 and the second connecting part 140. It adopts a two-sided split structure and combined with bidirectional positioning assembly, which can be assembled with the structure of the pole post 200, simplifying the assembly process and optimizing the assembly technology.

[0059] Please see Figures 1 to 4In an optional embodiment of this utility model, two first engaging portions 150 are arranged along a second direction on the first lower plastic 110, and two second engaging portions 160 are arranged along a second direction on the second lower plastic 120. The second direction is the direction of the dividing line of the lower plastic 100, for example, the length direction of the lower plastic 100. After the first lower plastic 110 and the second lower plastic 120 are installed and connected, the first engaging portions 150 and the second engaging portions 160 cooperate to form a pole post hole. The pole post 200 cooperates with the pole post hole to achieve radial limiting and prevent the pole post 200 from shifting. By forming a pole post hole through the cooperation of the first engaging portions 150 and the second engaging portions 160 to constrain the radial movement of the pole post 200, the vibration and shift of the pole post 200 are effectively avoided, the stability of the structure is improved, and the pole post 200 can be first welded to the bare cell tab, and then the lower plastic 100 is assembled from both sides to form a pole post assembly, simplifying the assembly process of the pole post assembly. It is understood that in other embodiments, such as in a single-pole battery, a first engaging portion 150 and a corresponding second engaging portion 160 can be provided on the first lower plastic 110 and the second lower plastic 120, respectively. The structure is not limited as long as it can cooperate to achieve radial positioning of the pole post 200.

[0060] Please see Figures 1 to 4 In an optional embodiment of this utility model, the first connecting part 130 is disposed on the side of the first lower plastic 110 near the second lower plastic 120, and the second connecting part 140 is disposed on the side of the second lower plastic 120 near the first lower plastic 110. The first connecting part 130 and the second connecting part 140 are configured to engage with each other in a first direction to connect the first lower plastic 110 and the second lower plastic 120. After the first lower plastic 110 and the second lower plastic 120 are close together, they are connected by engaging the first connecting part 130 and the second connecting part 140 in the connecting area. The structure is simple, occupies little space, and is convenient and quick to install. The lower plastic 100 is fixed in relative position by engaging the first connecting part 130 and the second connecting part 140, which simplifies the assembly process. Moreover, the assembly of the lower plastic 100 does not require welding, which also eliminates the risk of plastic deformation or sealing failure caused by welding, and reduces process costs.

[0061] Please see Figures 1 to 6 as well as Figures 13 to 16In an optional embodiment of the present invention, the first connecting part 130 includes a hook 131, and the second connecting part 140 includes a slot 141 that matches the hook 131. The hook 131 and the slot 141 engage with each other in a first direction to connect the first lower plastic 110 and the second lower plastic 120. The ends of the hook 131 and / or the slot 141 are provided with guide slopes to guide the hook 131 to slide into the slot 141 in the first direction. Specifically, a hook 131 is provided on the bottom surface of the first lower plastic 110 near the side of the second lower plastic 120. The hook 131 is, for example, a rectangular block with a guide slope. A groove 141 is provided on the bottom surface of the second lower plastic 120 near the side of the first lower plastic 110. The groove 141 extends from the edge of the second lower plastic 120 towards the side near the first lower plastic 110. A guide slope is also provided at the entrance of the groove 141. The width of the groove 141 is not less than the width of the hook 131, and the depth of the groove 141 is not less than the thickness of the hook 131. This allows the hook 131 to be embedded in the groove 141 and ensures a stable connection of the lower plastics. After the hook 131 and the groove 141 are engaged, the sides of the first lower plastic 110 and the second lower plastic 120 can fit together or have a gap fit.

[0062] During assembly, the first lower plastic 110 and the second lower plastic 120 are pushed along the first direction. As they move relative to each other, the hook 131 contacts the entrance edge of the slot 141 via the guide ramp. Under pressure, it undergoes elastic deformation and slides into the slot 141. After the hook 131 is fully inside the slot 141, it returns to its original shape. The locking surfaces at the bottom and sides of the slot 141 lock the hook 131 in place, thus connecting and fixing the first lower plastic 110 and the second lower plastic 120. The connection structure is simple, reliable, quick to assemble, and low in cost. The guide ramp facilitates the sliding of the hook 131, reducing collision damage and improving operational tolerance. The hook 131 can also be thickened at the base and thin-walled at the end to ensure strength while facilitating assembly. It is understood that the hook 131 and the slot 141 can simply cooperate to connect; for example, the first connecting part 130 can also be a slot 141 structure, and correspondingly, the second connecting part 140 can be a hook 131 structure.

[0063] Please refer to 1 to Figure 6 as well as Figures 13 to 16In an optional embodiment of this utility model, two first connecting parts 130 are respectively disposed at both ends of the first lower plastic 110 along the second direction. Correspondingly, two second connecting parts 140 are disposed at both ends of the second lower plastic 120 and are connected to the first connecting parts 130. The connection of the two connecting parts at both ends achieves stable installation of the lower plastic 100 as a whole. After the pole post 200 is assembled, the first lower plastic 110 and the second lower plastic 120 move relative to each other from both sides of the pole post 200 and approach each other. The first connecting parts 130 and the second connecting parts 140 engage to connect the lower plastic 100 into a whole and are fixed by connecting to the pole post 200. The structure is simple and easy to install. It is understood that the number and position of the first connecting parts 130 and the second connecting parts 140 are not limited, as long as they facilitate connection and ensure the stability of the lower plastic 100 structure without affecting other functions of the lower plastic 100. For example, a set of connecting structures can be added in the area between the two pole post holes to ensure the stability of the overall structure of the lower plastic 100.

[0064] It should be noted that the structure and position of the first connecting part 130 and the second connecting part 140 are not limited, as long as they can achieve the engagement of the first lower plastic 110 and the second lower plastic 120 in the first direction. In other embodiments, a dovetail tenon structure or the like can also be used to connect the first lower plastic 110 and the second lower plastic 120. A dovetail tenon is formed by extending outward from the side of the first lower plastic 110, and a trapezoidal mortise is formed by recessing the side of the second lower plastic 120. When the first lower plastic 110 and the second lower plastic 120 move relative to each other in the first direction, they can be fixed by the tenon and mortise engagement.

[0065] Please see Figures 1 to 8In an optional embodiment of this utility model, the electrode post 200 includes an electrode post body 210, an upper plastic 220, a welding ring 230, and a sealing element 240. The upper plastic 220 is arranged around the outer periphery of the electrode post body 210, and the welding ring 230 is arranged around the outer periphery of the upper plastic 220. The welding ring 230 and the electrode post body 210 clamp the lower plastic 100 in a second direction to ensure the stability and reliability of the overall assembly. Specifically, a base plate 211 for welding to the electrode tab is formed at the bottom of the electrode body 210; an upper plastic 220 is disposed on the base plate 211 and surrounds the outer periphery of the electrode body 210; a welding ring 230 is connected to the upper plastic 220 and surrounds the outer periphery of the upper plastic 220, with the welding ring 230 partially embedded in the upper plastic 220 for positioning; after the lower plastic 100 is disposed on the base plate 211, the welding ring 230 presses on the lower plastic 100, and the welding ring 230 and the base plate 211 clamp the lower plastic 100 in a second direction to ensure a stable connection of the lower plastic 100; a sealing element 240 is disposed on the base plate 211 and surrounds the outer periphery of the upper plastic 220, and the upper plastic 220, the base plate 211, the welding ring 230 and the lower plastic 100 form a cavity, and the sealing element 240 fills the cavity to achieve a seal.

[0066] Please see Figures 1 to 8 In an optional embodiment of this utility model, the side of the welding ring 230 opposite to the lower plastic 100 extends along the second direction to form a first protrusion 231, and the side of the lower plastic 100 opposite to the welding ring 230 is recessed along the second direction to form a first groove 170. The first protrusion 231 and the first groove 170 abut against each other along the second direction so that the welding ring 230 and the pole post base plate 211 clamp the lower plastic 100 in the second direction. Through the stepped concave-convex mating structure, it is convenient to realize the axial and radial mating of the welding ring 230 and the lower plastic 100. During assembly, the first lower plastic 110 and the second lower plastic 120 enter the assembly space formed by the welding ring 230 and the pole base plate 211 from both sides. The first protrusion 231 of the welding ring 230 is embedded in the first groove 170 of the lower plastic 100. The matching design of the first protrusion 231 and the first groove 170 facilitates the positioning of the lower plastic 100 during installation. After installation, the welding ring 230 and the pole base plate form an axial clamp on the lower plastic 100 in the second direction. At the same time, the radial matching of the first protrusion 231 and the first groove 170 limits the movement of the lower plastic 100, achieving reliable fixation and preventing the lower plastic 100 from shifting.

[0067] Please see Figures 1 to 16In an optional embodiment of this utility model, a second protrusion 180 is formed on the side of the lower plastic 100 opposite to the pole base plate 211 extending along the second direction. The pole base plate 211 is disposed within the groove space surrounded by the second protrusion 180. The second protrusion 180 is formed on the side of the lower plastic 100 near the pole base plate 211. The structure of the second protrusion 180 is not limited. For example, the second protrusion 180 can be set along the circumference of the lower plastic 100 and avoid the pole tab. The size of the groove space formed by it is larger than the size of the pole base plate 211, so that the pole base plate 211 can be embedded in the groove space surrounded by the second protrusion 180 without affecting the installation of the lower plastic 100. The lower plastic 100 contacts the core through the protrusion structure. The protrusion structure is used to transfer stress to the lower plastic 100, avoiding deformation of the pole under stress. After the lower plastic 100 is assembled, the pole tab misalignment area can be pressed under the lower plastic 100, saving the process of cutting the pole tab.

[0068] Please see Figure 3 and Figure 7 , Figure 8 In an optional embodiment of this utility model, the sealing element 240 is disposed on the electrode base plate 211 and surrounds the outer periphery of the upper plastic 220. The upper plastic 220, the electrode base plate 211, the welding ring 230 and the lower plastic 100 form a cavity. When the upper plastic is assembled, the sealing element 240 is subjected to axial pressure, thereby being compressed and flowing to the side to fill the cavity gap, achieving a sealing effect and preventing the electrolyte from entering the copper-aluminum composite interface and causing corrosion.

[0069] Please see Figure 3 and Figure 7 , Figure 8 In an optional embodiment of this utility model, the sealing element 240 under normal conditions includes a first part 241 and a second part 242. The thickness of the first part 241 in the height direction of the pole post base plate 211 is less than the height of the cavity, and the thickness of the second part 242 in the height direction of the pole post base plate 211 is greater than the height of the cavity. A sealing ring flow cavity is formed between the second part 242, the upper plastic 220, and the lower plastic 100. The second part 242 is configured to fill the sealing ring flow cavity to achieve a seal when compressed. During assembly, the welding ring 230 is pressed on top of the sealing element 240, and the sealing element 240 flows and fills the surrounding space under pressure to form a seal.

[0070] Please see Figure 7In one optional embodiment of this utility model, a first flow cavity is formed above the first portion 241 on the side of the sealing member 240 near the upper plastic 220, and a second flow cavity is formed between the second portion 242 and the lower plastic 100 on the side of the sealing member 240 near the lower plastic 100. When the sealing member 240 is compressed, it can flow radially to both sides to fill the gap and complete the seal. The force relief on both sides reduces the rebound force of the sealing member 240 and avoids overpressure. In other embodiments, the height of the first portion 241 may be the same as the height of the cavity, or the sealing ring may only include the second portion 242, that is, there is no flow gap on the side of the sealing member 240 near the upper plastic 220, and it only flows to the side of the lower plastic 100 when compressed, resulting in a large instantaneous rebound force of the sealing ring.

[0071] Please see Figure 7 In an optional embodiment of this utility model, the side of the seal 240 that is in contact with the welding ring 230 is the first end face 243, the side of the second part 242 facing the lower plastic 100 is set as the first inclined surface 2421 and the angle between the first inclined surface 2421 and the first end face 243 is an obtuse angle, and / or the side of the second part 242 facing the upper plastic 220 is set as the second inclined surface 2422 and the angle between the second inclined surface 2422 and the first end face 243 is an obtuse angle. The setting of the edge inclination angle of the seal 240 causes the seal 240 to form a gradual deformation during the assembly compression process. During the deformation process, the angle between the first inclined surface 2421 and / or the second inclined surface 2422 and the first end face 243 is an obtuse angle, which ensures that the seal 240 flows radially and will not curl or fold. This avoids problems such as failure to fill the cavity and complete sealing and positioning or sealing failure when the edge is compressed. At the same time, it reduces the risk of stress concentration at the sealing interface and improves the uniformity of the seal. In other embodiments, the height of the first part 241 may also be the same as the height of the cavity, or the seal 240 may only include the compressible second part 242, that is, there is no flow gap on the side of the seal 240 near the upper plastic 220, and when it is compressed, it only flows to the side of the lower plastic 100, and the instantaneous sealing ring has a large rebound force.

[0072] Please see Figure 7In a specific embodiment of this utility model, the axial height of the cavity is, for example, 0.7 mm. The first part 241 of the seal 240 is a non-compressible part with a height of, for example, 0.2 mm, and the second part 242 is a compressible flow part with a height of 1.1 mm. When the seal 240 is compressed, the second part 242 flows radially to both sides, and the seal 240 is compressed to 0.7 mm, filling the area between the welding ring 230 and the pole base plate 211. It can be understood that when the first flow cavity above the first part 241 is filled by the second part 242, the seal 240 is tightly connected with the pole base plate 211, the upper plastic 220, and other components to form a seal. The height and width of the first flow cavity are determined according to the volume of the seal 240.

[0073] Please see Figure 7 In one specific embodiment of this utility model, the included angle θ between the first inclined surface 2421 and the second inclined surface 2422 and the first end face 243 is ≥90°, and the first end face 243 is the side where the sealing element 240 and the welding ring 230 are in contact, so as to ensure that the radial flow of the sealing element 240 achieves filling and sealing. Preferably, the included angle θ satisfies 94°≤θ≤120°. Under this angle structure, it is convenient to realize the radial flow of the sealing element 240 and avoid the edge folding under pressure, which would prevent it from filling the cavity and thus affect the sealing effect.

[0074] Understandably, to prevent the electrolyte from corroding the electrode, the sealing element 240 should ensure that the electrochemical corrosion path of the electrolyte to the electrode is blocked when sealing. The electrode 200 is, for example, a copper-aluminum composite electrode, with the column section made of aluminum and the base plate section made of copper. The interface between the copper and aluminum forms a copper-aluminum interface. The outer periphery of the copper-aluminum interface is completely enclosed within the corrosive medium isolation zone formed by the sealing element 240, and maintains a certain radial safety distance from the inner wall of the sealing element 240. Specifically, the distance between the side of the second part 242 away from the electrode body 210 and the copper-aluminum interface is not less than the radial dimension of the compressible part of the sealing element 240 to ensure a good sealing effect.

[0075] Please see Figures 1 to 8 In an optional embodiment of this utility model, after the upper plastic 220, the sealing element 240 and the welding ring 230 are sequentially assembled on the outside of the pole body 210, the welding ring 230 is connected to the upper plastic 220 and pressed on the top of the sealing element 240. Under the action of axial pressure, the sealing element 240 flows to both sides and fills the cavity to achieve sealing. After the pole 200 is assembled, it is welded to the pole ear through the pole base plate 211.

[0076] Please see Figures 8 to 9In an optional embodiment of this utility model, a first positioning structure 300 is provided on the side of the lower plastic 100 that is in contact with the pole base plate 211. The first positioning structure 300 is arranged at both ends of the pole base plate 211 along the second direction and will not affect the welding of the pole base plate 211 to the pole ears. At least two sets of first positioning structures 300 are respectively provided at both ends of the pole base plate 211 to achieve effective anti-torsion function and avoid the lower plastic 100 from breaking or being damaged.

[0077] Please see Figures 8 to 9 In an optional embodiment of this utility model, the first positioning structure 300 includes a first positioning part 310 and a first mating groove 320. The first positioning part 310 is embedded in the first mating groove 320 to achieve positioning and connection between the lower plastic 100 and the pole base plate 211, while resisting torsional torque. This fitting structure achieves positioning of the lower plastic 100 and the pole base plate 211 while also providing anti-torsion. Specifically, the first positioning part 310 is a protrusion structure that protrudes along the thickness direction of the lower plastic 100. The cross-section of the protrusion is, for example, rectangular. The protrusion is integrally formed on the lower plastic 100. The groove shape of the first mating groove 320 matches the shape of the protrusion. During assembly, the protrusion is inserted axially into the groove. The contact between the protrusion and the sidewall of the groove restricts the displacement of the lower plastic 100 in the length direction, thereby achieving alignment. It is understandable that the shape of the first positioning part 310 and the first mating groove 320 is not limited. The first mating groove 320 can be, for example, a dovetail groove, a rectangular groove, etc., as long as it can achieve positioning and resist rotational torque.

[0078] It should be noted that the relative positions of the first positioning part 310 and the first mating groove 320 are not restricted. The first positioning part 310 is disposed on the lower plastic 100 and the first mating groove 320 is disposed on the pole post base plate 211, or the first positioning part 310 is disposed on the pole post base plate 211 and the first mating groove 320 is disposed on the lower plastic 100. Both can achieve the positioning and anti-torsion function of the lower plastic 100, and ensure the overall stability of the pole post assembly.

[0079] Please see Figures 10 to 15This utility model also proposes a cover plate assembly, including an electrode post assembly and a cover plate body 400. The cover plate body 400 is disposed on the lower plastic 100 and surrounds the outer periphery of the welding ring 230. The cover plate body 400 is welded to the welding ring 230 to achieve the connection with the electrode post 200. After the lower plastic 100 and the electrode post 200 are assembled and welded to the electrode lug, the cover plate body 400 is welded to the welding ring 230 to achieve the overall assembly of the cover plate assembly. The first lower plastic 110 and the second lower plastic 120 can be directly snapped together from both sides of the terminal post 200 without welding or additional fasteners. The first snapping part 150 and the second snapping part 160 cooperate to form a terminal post hole to constrain the radial movement of the terminal post, prevent the terminal post from vibrating and shifting, and improve structural stability. Thus, the terminal post assembly can be assembled independently. The terminal post 200 and the tab of the bare cell can be welded first, and then the lower plastic 100 can be assembled from both sides to form the terminal post assembly. The entire terminal post assembly is then assembled with the cover plate body 400. Compared with the method of first forming the terminal post 200 and the cover plate body 400 into a whole and then assembling it with the tab of the bare cell, this method avoids excessive stretching of the tab, thereby shortening the length of the tab, improving the internal space utilization of the cell, and simplifying the assembly process of the terminal post assembly.

[0080] Please see Figures 13 to 15 In an optional embodiment of this utility model, a second positioning structure 500 is provided on the surface of the lower plastic 100 that contacts the cover plate body 400, for positioning and connecting the cover plate body 400 and the lower plastic 100, ensuring the stability of the cover plate body 400 during welding. The second positioning structure 500 includes a second positioning part 510 and a second mating groove 520. The second positioning part 510 is embedded in the second mating groove 520 to achieve positioning. The second positioning part 510 is a boss structure, and its shape is not limited, such as a cylindrical boss, a conical boss, etc. The shape of the second mating groove 520 is consistent with that of the second positioning part 510. When the cover plate body 400 is assembled, it covers the lower plastic 100. The precise assembly and positioning of the cover plate body 400 is achieved through the engagement of the second positioning part 510 and the second mating groove 520, avoiding welding misalignment and ensuring the stability of the welding process.

[0081] Please see Figures 13 to 15 In an optional embodiment of this utility model, multiple sets of second positioning structures 500 are respectively disposed at both ends of the first lower plastic 110 and the second lower plastic 120. The second positioning part 510 is disposed on the lower plastic 100, and the second mating groove 520 is formed on the cover plate body 400, or the second positioning part 510 is disposed on the cover plate body 400, and the second mating groove 520 is formed on the lower plastic 100. When the cover plate body 400 is assembled, the second positioning part 510 and the second mating groove 520 can engage to achieve positioning of the cover plate body 400, ensuring the stability of welding and preventing misalignment or displacement of the cover plate body 400.

[0082] Please see Figure 12 In an optional embodiment of this utility model, a third protrusion 232 is formed radially on the side of the welding ring 230 near the lower plastic 100. The third protrusion 232 is an annular protrusion structure. Correspondingly, a third groove 410 is formed radially on the side of the cover plate body 400 near the lower plastic 100. It is an annular groove structure. The third protrusion 232 and the third groove 410 cooperate to connect the cover plate body 400 to the welding ring 230. A stepped structure is formed on the welding ring 230 through the third protrusion 232, which cooperates with the cover plate body 400. The step facilitates the positioning of the cover plate body 400, so that the welding surfaces of the cover plate body 400 and the welding ring 230 are stably on the same plane and will not be misaligned, which facilitates welding. At the same time, the misalignment distribution of the stepped surface can effectively prevent welding slag from falling into the battery cell, ensuring welding quality. Moreover, the stepped surface assembly structure can avoid local stress concentration when subjected to axial force, improving structural stability and connection strength.

[0083] Please see Figure 12 In an optional embodiment of this utility model, a chamfer is provided on the surface where the third groove 410 and the third protrusion 232 mate, which reduces local stress concentration. At the same time, the chamfer is used as an assembly guide angle to reduce the risk of jamming or misalignment, making it easier to assemble the cover plate body 400 and improving assembly efficiency.

[0084] It should be noted that in other embodiments, the cover plate body 400 and the welding ring 230 can also be connected by a vertical surface and a chamfer can be provided to facilitate installation; or the cover plate body 400 and the welding ring 230 can also be connected by a beveled surface, using a large beveled surface to guide the cover plate body 400 to achieve assembly. At the same time, the beveled mating surface has a longer mating distance, which allows for a longer welding distance and improves welding strength.

[0085] Please see Figures 1 to 17 In an optional embodiment of this utility model, after the pole post 200 is assembled and laser-welded to the electrode tab, the first lower plastic 110 and the second lower plastic 120 are moved relative to each other along the first direction from both sides of the pole post 200 and approach the pole post 200. The first lower plastic 110 and the second lower plastic 120 are connected by the engagement of the first connecting part 130 and the second connecting part 140. After the lower plastic 100 is installed, it is fixed by the upper welding ring 230 and the lower pole post base plate 211. Then, the cover plate body 400 is installed above the lower plastic 100. The cover plate body 400 is positioned by the second positioning part 510 and welded to the welding ring 230, thus completing the assembly of the cover plate assembly.

[0086] Please see Figures 1 to 17This utility model also proposes a battery, which includes a cover plate assembly as described in any of the above embodiments. The cover plate assembly is welded to the electrode tabs of the battery cell via a terminal base plate 211. The cover plate assembly and the battery cell are assembled and placed inside the housing. Sealing is achieved by welding the cover plate body 400 to the housing, thus completing the overall assembly of the battery. Through the coordinated operation of the independent terminal structure, the split lower plastic structure, the snap-fit ​​fixing structure, and various positioning structures in the cover plate assembly, the battery achieves improved sealing and structural reliability, simplifies the assembly process, maximizes space utilization, and effectively improves the battery energy density.

[0087] In summary, the electrode assembly, cover assembly, and battery of this utility model utilize the special segmented structure of the lower plastic 100, combined with the installation method of the first lower plastic 110 and the second lower plastic 120 on both sides of the electrode 200, to achieve rapid assembly of the lower plastic 100 and the electrode 200. The lower plastic 100 is fixed by the electrode 200, and the connecting part and the snap-fit ​​part work together to ensure structural stability, reducing the number of plastic parts, optimizing the assembly process, and reducing costs. The special structure of the sealing element 240 allows it to flow to both sides under pressure, achieving a better sealing effect. The connection structure between the welding ring 230 and the cover body 400 facilitates the positioning of the cover body 400 and improves the welding quality. The cover body 400 and the lower plastic 100 are positioned by the second positioning structure 500, ensuring the stability of the cover body 400 during welding and preventing the lower plastic 100 from twisting. The lower plastic 100 and the electrode base plate 211 are positioned by the first positioning structure 300 and effectively prevent twisting.

[0088] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0089] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0090] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0091] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0092] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0093] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0094] The above description of the embodiments shown in this utility model (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the utility model.

[0095] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0096] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A pole assembly, characterized in that, It includes a lower plastic and an electrode post, wherein the lower plastic includes a first lower plastic and a second lower plastic, and the first lower plastic and the second lower plastic are arranged along a first direction; At least one of the first lower plastic and the second lower plastic is provided with a first connecting part, and the other is provided with a corresponding second connecting part. The first connecting part and the second connecting part are connected to fix the relative position of the first lower plastic and the second lower plastic. One of the first lower plastic and the second lower plastic is provided with at least one first engaging portion, and the other is provided with a second engaging portion that cooperates with the at least one first engaging portion. The at least one first engaging portion and the corresponding second engaging portion cooperate to form at least one pole hole to fix the pole in the radial direction of the pole.

2. The pole assembly according to claim 1, characterized in that, The electrode post includes an electrode post body, an upper plastic layer, and a welding ring. The upper plastic layer is arranged around the outer periphery of the electrode post body, and the welding ring is arranged around the outer periphery of the upper plastic layer. The welding ring and the electrode post body clamp the lower plastic layer in a second direction.

3. The pole assembly according to claim 2, characterized in that, A base plate is formed at the bottom of the electrode body, the lower plastic is disposed on the base plate, the welding ring is pressed on the lower plastic, and the welding ring and the base plate clamp the lower plastic in the second direction.

4. The pole assembly according to claim 3, characterized in that, The side of the welding ring opposite to the lower plastic extends along the second direction to form a first protrusion, and the side of the lower plastic opposite to the welding ring is recessed along the second direction to form a first groove. The first protrusion and the first groove abut against each other along the second direction so that the welding ring and the pole plate clamp the lower plastic in the second direction.

5. The pole assembly according to claim 3, characterized in that, The side of the lower plastic that contacts the pole base plate is also provided with a first positioning structure, and the first positioning structure is arranged at both ends of the pole base plate along the second direction. The first positioning structure includes a first positioning part and a first mating groove, wherein the first positioning part is embedded in the first mating groove; The first positioning part is disposed on the lower plastic, and the first mating groove is disposed on the pole post base plate, or the first positioning part is disposed on the pole post base plate, and the first mating groove is disposed on the lower plastic.

6. The pole assembly according to claim 1, characterized in that, The first connecting portion is disposed on the side of the first lower plastic near the second lower plastic, and the second connecting portion is disposed on the side of the second lower plastic near the first lower plastic. The first connecting portion and the second connecting portion are configured to engage with each other in the first direction to connect the first lower plastic and the second lower plastic.

7. The pole assembly according to claim 6, characterized in that, The first connecting part includes a hook, and the second connecting part includes a slot that matches the hook. The hook and the slot engage with each other in the first direction to connect the first lower plastic and the second lower plastic. The end of the hook and / or the slot is provided with a guide slope to guide the hook to slide into the slot along the first direction.

8. The pole assembly according to claim 3, characterized in that, The lower plastic part opposite to the pole base plate extends along the second direction to form a second protrusion, and the pole base plate is disposed in the groove space surrounded by the second protrusion.

9. The pole assembly according to claim 3, characterized in that, The pole also includes a sealing element. The upper plastic, the pole base plate, the welding ring, and the lower plastic form a cavity, and the sealing element fills the cavity to achieve a seal. Under normal conditions, the sealing element includes a first part and a second part, wherein the thickness of the first part in the height direction of the pole base plate is less than the height of the cavity, and the thickness of the second part in the height direction of the pole base plate is greater than the height of the cavity. The second part forms a sealing ring flow cavity between the upper plastic and the lower plastic, and the second part is configured to fill the sealing ring flow cavity to achieve a seal when the seal is compressed.

10. The pole assembly according to claim 9, characterized in that, The side of the seal that contacts the welding ring is the first end face. The second part facing the lower plastic is set as a first inclined surface and the angle between the first inclined surface and the first end face is an obtuse angle, and / or the second part facing the upper plastic is set as a second inclined surface and the angle between the second inclined surface and the first end face is an obtuse angle.

11. A cover plate assembly, characterized in that, The device includes the pole assembly as described in any one of claims 1 to 10, and the cover plate body, wherein the side of the lower plastic and the cover plate body that are in contact with each other is provided with a second positioning structure, the second positioning structure including a second positioning part and a second mating groove, the second positioning part being embedded in the second mating groove; The second positioning part is disposed on the lower plastic, and the second mating groove is disposed on the cover plate body, or the second positioning part is disposed on the cover plate body and the second mating groove is disposed on the lower plastic.

12. The cover plate assembly according to claim 11, characterized in that, A third protrusion is formed radially on the outer peripheral surface of the welding ring near the lower plastic, and a third groove is formed radially on the side of the cover plate body near the lower plastic. The third protrusion and the third groove cooperate to connect the cover plate body to the welding ring.

13. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 11 to 12.

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